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Electrical and Electronics Engineering publications abstract of: 04-2012 sorted by title, page: 22
» Implicit position and speed estimation algorithm without the flux computation for the rotor side control of doubly fed induction motor drive
Abstract:
A simple and implicit sensorless algorithm for estimating the rotor position and speed of the doubly fed induction machine is proposed in this study. Instead of computing the stator magnetic flux directly or indirectly, the stator flux vector components in the stationary reference frame are substituted with analytical equivalents in terms of measurable stator and rotor quantities. Thus, it is an implicit estimation process devoid of computing any flux terms and requires only the measured stator voltage and currents in stator and rotor windings apart from knowledge of the machine parameters. It is an open-loop scheme. However, it does not involve integration, recursive techniques, re-computations or programmable low-pass filters etc. Starting on the fly, accurate estimation near synchronous speed, immunity against variation in stator and rotor resistances or in the magnetising inductance are the principal advantages of the algorithm. Reduced complexity and the computational burden facilitate the easy implementation of the algorithm on a low-cost fixed point processor. Excellent agreement between the simulation and test results on a laboratory doubly fed induction motor validates the proposed estimation algorithm implemented for the vector control of a doubly fed induction motor. On the whole, the estimation algorithm is a new insight that holds promise in the area of sensorless control of the DFIM, whether used as a motor or as a generator.
Autors: Karthikeyan, A.;Nagamani, C.;Chaudhury, A.B.R.;Ilango, G.S.;
Appeared in: IET Electric Power Applications
Publication date: Apr 2012, volume: 6, issue:4, pages: 243 - 252
Publisher: IEEE
Full litterature document
 
» Improved 1/f noise characterization of strained SiGe on insulator MOSFETs fabricated on wafers obtained by the Ge enrichment technique
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Autors:
Appeared in: Solid-State Electronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improved Autotransformer Model for Transient Recovery Voltage (TRV) Studies
Abstract:
A three-phase ungrounded fault supplied by a single autotransformer produces a transient recovery voltage (TRV) that is often the worst case for a circuit breaker (CB). This is the so-called “transformer limited fault.” The transformer model is extremely important for computing this TRV because it is the key element in the circuit. Unfortunately, data that are needed for more sophisticated autotransformers models (e.g. frequency-response analysis (FRA) data) are not readily available to the study engineer. Consequently, time-domain simulations are generally based on simplified second order (RLC) transformer models whose parameters are estimated from curves provided in IEEE Standard C37.011. This paper provides a more robust autotransformer model that is based on measurement data that are more readily available. The model is validated using FRA data from factory tests. TRV simulation results are compared with those produced by simplified second-order models. In addition, capacitance measurement data for twenty-two 230:115-kV autotransformers are provided to expand the body of capacitance data available to the industry.
Autors: Horton, R.;Dugan, R. C.;Wallace, K.;Hallmark, D.;
Appeared in: IEEE Transactions on Power Delivery
Publication date: Apr 2012, volume: 27, issue:2, pages: 895 - 901
Publisher: IEEE
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» Improved Estimation of Transmission Distortion for Error-Resilient Video Coding
Abstract:
This paper presents an improved technique for estimating the end-to-end distortion, which includes both a quantization error after encoding and a random transmission error, after transmission in video communication systems. The proposed technique mainly differs from most existing techniques in that it takes into account filtering operations, e.g., interpolation in subpixel motion compensation, as introduced in advanced video codecs. The distortion estimation for pixels or subpixels under filtering operations requires the computation of the second moment of a weighted sum of random variables. In this paper, we prove a proposition for calculating the second moment of a weighted sum of correlated random variables without requiring knowledge of their probability distribution. Then, we apply the proposition to extend our previous error-resilient algorithm for prediction mode decision without significantly increasing complexity. Experimental results using an H.264/AVC codec show that our new algorithm provides an improvement in both rate-distortion performance and subjective quality over existing algorithms. Our algorithm can also be applied in the upcoming high-efficiency video coding standard, where additional filtering techniques are under consideration.
Autors: Chen, Z.;Pahalawatta, P. V.;Tourapis, A. M.;Wu, D.;
Appeared in: IEEE Transactions on Circuits and Systems for Video Technology
Publication date: Apr 2012, volume: 22, issue:4, pages: 636 - 647
Publisher: IEEE
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» Improved harmonic balance implementation of Floquet analysis for nonlinear circuit simulation
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Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improved iterative joint detection and estimation through variational Bayesian inference
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Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improved lasing characteristics of ZnO/organic-dye random laser
Abstract:
We investigate the random lasing characteristics of ZnO nanopowder suspended in methanol with the addition of organic-dye molecules. At a certain dye concentration, the random lasing intensity is enhanced, and the excitation threshold power is reduced. These improvements are explained by Förster-type resonant energy transfer from the dye-molecule donor to the ZnO-nanopowder acceptor.
Autors: Firdaus, Kurniawan;Nakamura, Toshihiro;Adachi, Sadao;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:17, pages: 171101 - 171101-4
Publisher: IEEE
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» Improved light output power of GaN-based light-emitting diodes by using Ag grids
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Appeared in: Microelectronic Engineering
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improved LMI-based criterion for global asymptotic stability of 2-D state-space digital filters described by Roesser model using two's complement arithmetic
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Autors:
Appeared in: Digital Signal Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improved methodologies for the design of maneuver for stability and control simulations
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Appeared in: Aerospace Science and Technology
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improved Noise Modeling with Mutual Coupling in Receiving Antenna Arrays for Direction-of-Arrival Estimation
Abstract:
A new method for modeling correlated noise in receiving antenna arrays for direction-of-arrival (DOA) estimation is introduced. The array noise is divided into a coupled and an uncoupled components which originate from the array environment and the internal circuitry of the antenna elements, respectively. While the uncoupled noise power can be determined a priori and be removed from the array received power, the antenna mutual coupling in the coupled noise component can be decoupled in the same way as the antenna mutual coupling in the signals. This results in a very simple but effective MUSIC DOA estimation algorithm. Simulation results are presented to validate and demonstrate the performance of the new method.
Autors: Niow, C. H.;Hui, H. T.;
Appeared in: IEEE Transactions on Wireless Communications
Publication date: Apr 2012, volume: 11, issue:4, pages: 1616 - 1621
Publisher: IEEE
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» Improved Nonlocal Means Based on Pre-Classification and Invariant Block Matching
Abstract:
One of the most popular image denoising methods based on self-similarity is called nonlocal means (NLM). Though it can achieve remarkable performance, this method has a few shortcomings, e.g., the computationally expensive calculation of the similarity measure, and the lack of reliable candidates for some nonrepetitive patches. In this paper, we propose to improve NLM by integrating Gaussian blur, clustering, and rotationally invariant block matching (RIBM) into the NLM framework. Experimental results show that the proposed technique can perform denoising better than the original NLM both quantitatively and visually, especially when the noise level is high.
Autors: Yan, R.;Shao, L.;Cvetkovic, S. D.;Klijn, J.;
Appeared in: Journal of Display Technology
Publication date: Apr 2012, volume: 8, issue:4, pages: 212 - 218
Publisher: IEEE
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» Improved power efficiency in deep blue phosphorescent organic light-emitting diodes using an acridine core based hole transport material
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Appeared in: Organic Electronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improved relaxation algorithm for passive sensor data association
Abstract:
The Lagrangian relaxation algorithm is widely used for passive sensor data association. However, there are two major problems about it. Firstly, the cost function of the algorithm is computed by using least square estimation of the target position without taking the estimation errors into account. To solve this problem, a modified cost function is derived, which is more proper to reflect the correlation between measurements owing to the integration of estimation errors. Secondly, owing to the fact that building the candidate assignment tree would take a lot of CPU time, the authors propose a statistic test based on indicator function with a great improvement in the computational efficiency. It is shown analytically that this method can obtain the same result as that of Lagrangian relaxation algorithm in some special cases, so a part of correct pairs can be selected directly without redundant relaxation and enforcement processes, then the possible set can be simplified according to the constraint conditions so that more correct pairs can be picked out by repeating such a process. Simulation results show that both the correlation accuracy and the computational efficiency of the improved relaxation algorithm are higher than that of the traditional one.
Autors: C. Ouyang;H.-B. Ji;Y. Tian;
Appeared in: IET Radar, Sonar & Navigation
Publication date: Apr 2012, volume: 6, issue:4, pages: 241 - 250
Publisher: IEEE
Full litterature document
 
» Improved reliability of copper-cored solder joints under a harsh thermal cycling condition
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Appeared in: Microelectronics Reliability
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improved resolution DoA estimation through shrunk projections on the signal sub-space
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Appeared in: Signal Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improved switching uniformity in resistive random access memory containing metal-doped electrolyte due to thermally agglomerated metallic filaments
Abstract:
We demonstrate improved switching uniformity in resistive random-access memory (RRAM) containing metal-doped electrolyte due to thermally agglomerated metallic filaments. Rapid thermal annealing (RTA) produced copper-doped carbon (CuC) devices that exhibited better switching parameters, such as on/off resistance and set/reset voltage, than a control device. High-resolution transmission electron microscopy, electron dispersive spectroscopy, and conductive atomic force microscopy revealed that Cu atoms were agglomerated during the RTA process and formed a Cu filament in the CuC film. Consequently, the forming process can be eliminated, which is desirable for practical RRAM applications.
Autors: Lee, Wootae;Park, Jubong;Kim, Seonghyun;Woo, Jiyong;Shin, Jungho;Lee, Daeseok;Cha, Euijun;Hwang, Hyunsang;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:14, pages: 142106 - 142106-4
Publisher: IEEE
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» Improved Target Tracking in the Presence of Wakes
Abstract:
Tracking methods attempt to follow the movement of a target of interest while suppressing irrelevant clutter. A particularly troublesome source of clutter is wakes that appear behind the target. This problem arises in sonar tracking of human divers, in the tracking of boats using surveillance radars, and also in radar tracking of ballistic missiles. Previous research has integrated a solution to this problem in the popular probabilistic data association filter (PDAF). A new solution to this problem in the same framework is proposed here. While previous research has used an approach described as probabilistic editing, the new solution solves the wake problem in a Bayesian framework by means of marginalization. Monte-Carlo simulations show that the new solution provides significantly increased robustness as compared with both the standard PDAF and the probabilistic editing approach. As the new solution has improved theoretical underpinnings, we hope that it can be useful for further research on tracking in the presence of wake clutter.
Autors: Brekke, Edmund;Hallingstad, Oddvar;Glattetre, John;
Appeared in: IEEE Transactions on Aerospace and Electronic Systems
Publication date: Apr 2012, volume: 48, issue:2, pages: 1005 - 1017
Publisher: IEEE
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» Improved tracking and switching performance of an electro-pneumatic positioning system
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Appeared in: Mechatronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improved Transformer Noise Behavior by Optimized Laser Domain Refinement at ThyssenKrupp Electrical Steel
Abstract:
The present paper shows the impact of different laser domain refinement variants for grain oriented electrical steel on the noise of three-phase transformer cores. The impact is evaluated as well by calculated noise on basis of magnetostriction measurements of the electrical steel sheets as by measured noise of transformer core models built from these GO electrical steel sheets. The industrially relevant process of laser domain refinement is reviewed with respect to the influence of different process parameters on the later materials and transformer performance. Contrary to the usually admitted statement, it is demonstrated, that (a) the use of optimum laser domain refinement conditions will not increase the noise level of the transformer cores compared to the non DR status and (b) the use of magnetostriction data for judging about later transformer noise is resulting in only rough indications, but not the final behavior of the real cores.
Autors: Lahn, L.;Wang, C.;Allwardt, A.;Belgrand, T.;Blaszkowski, J.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1453 - 1456
Publisher: IEEE
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» Improved transparency in energy-based bilateral telemanipulation
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Appeared in: Mechatronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improved ZVS DC-DC Converter With a High Voltage Gain and a Ripple-Free Input Current
Abstract:
An improved zero-voltage-switching (ZVS) dc-dc converter with a high voltage gain and a ripple-free input current is proposed. It consists of two converter cells—a boost cell and an asymmetrical pulse-width-modulation (APWM) full-bridge cell. The boost cell in the proposed converter has the capabilities of providing a ripple-free input current. The APWM full-bridge cell provides a high voltage gain. The output diodes are under zero-current-switching (ZCS) during turn-off. The proposed converter has high efficiency due to soft-switching operation in full-bridge switches. Steady-state analysis of the converter is presented to determine the circuit parameters. A laboratory prototype of the proposed converter is developed, and its experimental results are presented for validation.
Autors: Do, H.-L.;
Appeared in: IEEE Transactions on Circuits and Systems I: Regular Papers
Publication date: Apr 2012, volume: 59, issue:4, pages: 846 - 853
Publisher: IEEE
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» Improvement in Electrical and Optical Performances of GaN-Based LED With Double Dielectric Stack Layer
Abstract:
A SiO2/Al2O3 double dielectric stack layer was deposited on the surface of a GaN-based light-emitting diode (LED). The double dielectric stack layer increases the optical output power of the LED because the first Al2O3 layer plays a role as an effective surface passivation layer and the second SiO2 layer with lower index increases the critical angle of the emitted light and hence the overall extraction efficiency from the LED. The leakage current of the LED passivated with an Al2O3 layer was -3.46 ×10-11 A at -5 V, at least two and three orders lower in magnitude compared to that passivated with a SiO2 layer (-7.14 ×10-9 A) and that of the nonpassivated LED(-1.9 ×10-8 A), respectively, which indicates that the Al2O3 layer is very effective in passivating the exposed GaN surface after dry etching and hence reduces the nonradiative recombination as well as reabsorption of the emitted light near the etched surface.
Autors: Chung-Mo Yang;Dong-Seok Kim;Seong-Gil Lee;Jae-Hoon Lee;Yong Soo Lee;Jung-Hee Lee;
Appeared in: IEEE Electron Device Letters
Publication date: Apr 2012, volume: 33, issue:4, pages: 564 - 566
Publisher: IEEE
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» Improvement of AZO/p-a-SiC:H contact by the p-?c-Si:H insertion layer and its application to a-Si:H solar cells
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Appeared in: Solid-State Electronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improvement of dry float-sink separation of smaller sized spheres by reducing the fluidized bed height
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Appeared in: Advanced Powder Technology
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improvement of emission efficiency and color rendering of high-power LED by controlling size of phosphor particles and utilization of different phosphors
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Appeared in: Microelectronics Reliability
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improvement of filtration speed of charge injection type of electrostatic oil filter
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Appeared in: Journal of Electrostatics
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Improvement of lumen efficiency in white light-emitting diodes with air-gap embedded package
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Appeared in: Microelectronics Reliability
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improvement of n+-doped-layer free amorphous silicon thin film solar cells fabricated with CuMg alloy as back contact metal
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Appeared in: Solid-State Electronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improvement of Performance of Cardiac SPECT Camera Using Curved Detectors With Pinholes
Abstract:
SPECT is primarily used in the clinic for cardiac myocardial perfusion imaging. However, for SPECT, sensitivity is impaired due to the need for collimation. System resolution FWHM is poor as well . In this work the resolution of a curved detector was theoretically derived. The advantage of a curved detector over a flat detector with pinhole collimation was demonstrated for cardiac applications using theoretical derivations as well as a ray-tracing voxel-based forward projector. For the flat detector using parameters close to what was expected for the new multi-pinhole GE Discovery system, it is shown that using a paraboloid detector one may obtain a better system resolution (about 29% better on the average), keeping same pinhole opening. Alternately, sensitivity gains of as much as 2.25 may be obtained, for similar resolutions as a flat detector by just using a different pinhole with higher hole-diameter.
Autors: Dey, J.;
Appeared in: IEEE Transactions on Nuclear Science
Publication date: Apr 2012, volume: 59, issue:2, pages: 334 - 347
Publisher: IEEE
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» Improvement of residual error in hydrodynamic polishing by recursive error compensation strategy
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Appeared in: Microelectronic Engineering
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improvement of thermal management of high-power GaN-based light-emitting diodes
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Appeared in: Microelectronics Reliability
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improvements in Efficiency of Surface Potential Computation for Independent DG MOSFET
Abstract:
A robust numerical solution of the input voltage equations (IVEs) for the independent-double-gate metal–oxide–semiconductor field-effect transistor requires root bracketing methods (RBMs) instead of the commonly used Newton–Raphson (NR) technique due to the presence of nonremovable discontinuity and singularity. In this brief, we do an exhaustive study of the different RBMs available in the literature and propose a single derivative-free RBM that could be applied to both trigonometric and hyperbolic IVEs and offers faster convergence than the earlier proposed hybrid NR–Ridders algorithm. We also propose some adjustments to the solution space for the trigonometric IVE that leads to a further reduction of the computation time. The improvement of computational efficiency is demonstrated to be about 60% for trigonometric IVE and about 15% for hyperbolic IVE, by implementing the proposed algorithm in a commercial circuit simulator through the Verilog-A interface and simulating a variety of circuit blocks such as ring oscillator, ripple adder, and twisted ring counter.
Autors: Abraham, A.;Jandhyala, S.;Mahapatra, S.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Apr 2012, volume: 59, issue:4, pages: 1199 - 1202
Publisher: IEEE
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» Improving Energy Efficiency in Upstream EPON Channels by Packet Coalescing
Abstract:
In this paper, we research the feasibility of adapting the packet coalescing algorithm, used successfully in IEEE 802.3az Ethernet cards, to upstream EPON channels. Our simulation experiments show that, using this algorithm, great power savings are feasible without requiring any changes to the deployed access network infrastructure nor to protocols.
Autors: Rodriguez-Perez, Miguel;Herreria-Alonso, Sergio;Fernandez-Veiga, Manuel;Lopez-Garcia, Candido;
Appeared in: IEEE Transactions on Communications
Publication date: Apr 2012, volume: 60, issue:4, pages: 929 - 932
Publisher: IEEE
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» Improving playability of Blu-ray disc drives by using adaptive suppression of repetitive disturbances
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Appeared in: Automatica
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Improving Space-Time Code Performance in Slow Fading Channels using Reconfigurable Antennas
Abstract:
Space-time block codes typically only span a small number of time slots. However, error control coding spanning hundreds or thousands of symbol periods is often used with space-time coding. In this case, slow fading channels significantly degrade performance. In this letter, we show that performance can be significantly improved in slow fading conditions by using reconfigurable antennas. We propose switching the transmit antenna states during transmission so that the error control code experiences several different channel conditions over the transmission period. Hence, it can achieve higher diversity and the superior performance expected of a faster fading channel due to reconfigurable antenna state switching. If we also allow the receiver to select the reconfigurable receive antenna states based on channel energy, then an antenna state selection gain is also achieved.
Autors: Martin, Philippa A.;Smith, Peter J.;Murch, Ross;
Appeared in: IEEE Communications Letters
Publication date: Apr 2012, volume: 16, issue:4, pages: 494 - 497
Publisher: IEEE
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» Improving static stiffness of the 6-R?US parallel manipulator using inverse singularities
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Appeared in: Robotics and Computer-Integrated Manufacturing
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Impulse behavior of dielectric-covered rod-plane air gaps
Abstract:
The impulse behavior of composite short rod-plane air gaps with a dielectric-covered rod under positive lightning and switching impulse voltages is investigated, by monitoring the electric field strength at the earthed plane, by still photographs of corona discharges and through electric field computations. Experiments were performed in normal laboratory air at pressure around 0.1 MPa, temperatures in the range 19 to 28°C and absolute and relative humidity varied naturally between 11-21 g/m3 and 60-90%, respectively. Breakdown probability distributions were obtained for composite gaps with a dielectric cover made of either PTFE or epoxy resin and for simple air gaps with a bare rod. Also, basic characteristic parameters of coronas preceding breakdown in composite gaps, namely initial corona in the vicinity of the covering tip, surface coronas emerging along the dielectric cover and developing mainly in air, and secondary corona in the vicinity of the cover upper end, were measured. Surface corona development is greatly affected by initial corona growth and facilitates secondary corona inception. Breakdown, occurring at higher voltages for composite gaps, is closely related with the secondary corona inception; a similar dependence upon impulse waveshape and cover material was seen to exist. At breakdown, the spark channel bridges the gap that includes the dielectric cover length. The spark channel develops either along the cover surface or partly or solely in free air, being affected by surface corona development.
Autors: Mavroidis, P.N.;Mikropoulos, P.N.;Stassinopoulos, C.A.;
Appeared in: IEEE Transactions on Dielectrics and Electrical Insulation
Publication date: Apr 2012, volume: 19, issue:2, pages: 632 - 640
Publisher: IEEE
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» Impulsive noise cancelation with simplified Cauchy-based p-norm filter
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Appeared in: Signal Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» In Color Perception, Size Matters
Abstract:
In designing colors for digital visualization systems. one of the most critical factors is the interaction between size and color appearance. Whereas artists and visual designers understand this, recommendations for using color in visualization rarely address the issue, or even recognize it. The goal is to keep the user focused on the data, with color simply one of many tools used toward problem solving and discovery.
Autors: Stone, M.;
Appeared in: IEEE Computer Graphics and Applications
Publication date: Apr 2012, volume: 32, issue:2, pages: 8 - 13
Publisher: IEEE
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» In Situ Co/SiC(N,H) Capping Layers for Cu/Low- k Interconnects
Abstract:
Co films with various thicknesses were selectively deposited as Cu capping layers by chemical vapor deposition. Both in situ and ex situ Co/SiC(N,H) capping processes were evaluated and have shown comparable parametrics to the control reference. For the ex situ capping process, the degree of electromigration (EM) resistance enhancement was observed to be dependent on the deposited Co thickness. Without increasing the Co cap thickness, further EM lifetime enhancement was observed from the in situ capping process.
Autors: Yang, C.-C.;Li, B.;Shobha, H.;Nguyen, S.;Grill, A.;Ye, W.;AuBuchon, J.;Shek, M.;Edelstein, D.;
Appeared in: IEEE Electron Device Letters
Publication date: Apr 2012, volume: 33, issue:4, pages: 588 - 590
Publisher: IEEE
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» In situ surface pre-treatment study of GaAs and In0.53Ga0.47As
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The impact of using multiple cycles of trimethyl-aluminum (TMA) prior to Al2O3 deposition on the properties of (NH4)2S treated In0.53Ga0.47As and GaAs substrates was investigated by in situ x-ray photoelectron spectroscopy. Increasing the number of TMA cycles prior to Al2O3 atomic layer deposition (ALD) was seen to decrease the concentration of As-As detected at the oxide-semiconductor interface. The impact of annealing the (NH4)2S treated GaAs surface in situ prior to ALD, in various environments, was also investigated.
Autors: Brennan, B.;Zhernokletov, D. M.;Dong, H.;Hinkle, C. L.;Kim, J.;Wallace, R. M.;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:15, pages: 151603 - 151603-4
Publisher: IEEE
Full litterature document
 
» In-Field Demonstration of OFDM-Over-FSO
Abstract:
This letter reports the first in-field experiment of orthogonal frequency-division multiplexing (OFDM) over free-space optical channels at a rate of 300 Mb/s over a range of 1.87 km. Using customized commercial terminals, 20 OFDM channels with 2000 subcarriers each are transmitted with a 60-mW optical power in both clear and light-rain conditions. The received signals are digitized at 2 GSa/s and investigated on the symbol level. The experimental bit-error rates per channel and constellation diagrams are reported. Uncoded transmission has an average symbol-error rate on the order of in rain and in clear conditions.
Autors: Mostafa, A.;Hranilovic, S.;
Appeared in: IEEE Photonics Technology Letters
Publication date: Apr 2012, volume: 24, issue:8, pages: 709 - 711
Publisher: IEEE
Full litterature document
 
» In-line fiber Mach-Zehnder interferometer for simultaneous measurement of refractive index and temperature based on thinned fiber
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Autors:
Appeared in: Sensors and Actuators A: Physical
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» In-plane interdot carrier transfer in InAs/GaAs quantum dots
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Using time resolved photoluminescence (PL) quenching measurements, we investigated inplane carrier transfer in InAs/GaAs self-assembled quantum dots (QDs). THz pulses from a free-electron laser tuned to the intersublevel transition energy were used to excite carriers to higher levels causing quenching in the PL. These carriers could either fall back to the lower energy states and recombine or get transferred to adjacent QDs. The relaxation of the carriers was directly reflected in the recovery of the PL signal. Comparing measurements from two samples, we found that the redistribution of carriers into the neighbouring QDs is the dominant mechanism of carrier relaxation. The data were fitted using a rate equation model to estimate the PL recovery time which we attribute to the interdot carrier transfer time.
Autors: Bhattacharyya, J.;Zybell, S.;Winnerl, S.;Helm, M.;Hopkinson, M.;Wilson, L. R.;Schneider, H.;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:15, pages: 152101 - 152101-4
Publisher: IEEE
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» In-Plane-Gate Oxide-Based Thin-Film Transistors Self-Aligned on Stacked Self-Assembled Monolayer/ Electrolyte Dielectrics
Abstract:
Low-voltage oxide-based thin-film transistors (TFTs) gated by stacked self-assembled octadecylphonic acid (ODPA) monolayer/SiO2 electrolyte with an in-plane-gate structure are self-aligned by one nickel shadow mask at room temperature. The stacked gate dielectrics show a reduced gate leakage current with the aid of the well-organized dense-stacked ODPA monolayer buffer. The equivalent field-effect mobility, subthreshold voltage swing, and drain current on/off ratio of such TFTs are estimated to be 11 cm2/V·s, 140 mV/dec, and 106, respectively. Such low-voltage in-plane-gate TFTs are very promising for low-cost portable sensors.
Autors: Guodong Wu;Hongliang Zhang;Liqiang Zhu;Mingzhi Dai;Ping Cui;Qing Wan;
Appeared in: IEEE Electron Device Letters
Publication date: Apr 2012, volume: 33, issue:4, pages: 531 - 533
Publisher: IEEE
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» In-situ electron holography of surface potential response to gate voltage application in a sub-30-nm gate-length metal-oxide-semiconductor field-effect transistor
Abstract:
The response of the electrostatic potential distribution within a metal-oxide-semiconductor field-effect transistor (MOSFET) to an external electric field was revealed using electron holography cross-sectional in-situ observation while applying the gate voltage to a transistor scaled down to a 25-nm gate length. Charging effects due to electron irradiation were taken into account by using complementary numerical device simulation. Direct observation of the channel potential and its response to the gate voltage can be used to determine the gate electrode effective work-function for scaled MOSFETs.
Autors: Ikarashi, Nobuyuki;Takeda, Hiroshi;Yako, Koichi;Hane, Masami;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:14, pages: 143508 - 143508-3
Publisher: IEEE
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» In-situ fabrication of Al3V/Al2O3 nanocomposite through mechanochemical synthesis and evaluation of its mechanism
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Appeared in: Advanced Powder Technology
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Inaccuracy of Short-Term Light Flicker Indicator Measuring With a Flickermeter
Abstract:
This paper provides an analysis of the short-term light flicker indicator measuring inaccuracy. Due to the complexity of a flickermeter's signal path, a full analysis is practically impossible. With the use of a standard functional diagram and flickermeter's model equations, it has been possible to describe the most important reasons behind the measurement inaccuracy: reference value restoration inaccuracy, the discrepancy between the acquired filters' amplitude responses, and standard filter characteristics, the attenuation of the maximum signal values transmitted through internal filters cascade, and some difficulties with flicker-level statistical evaluation. With the help of the amplitude response, suggestions on sample rate selection for internal signals have been given.
Autors: Wiczynski, G.;
Appeared in: IEEE Transactions on Power Delivery
Publication date: Apr 2012, volume: 27, issue:2, pages: 842 - 848
Publisher: IEEE
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» Increased Susceptibility of Arterial Tissue to Wire Perforation With the Application of High-Frequency Mechanical Vibrations
Abstract:
High-frequency mechanical vibrations (20–50 kHz), delivered via small diameter flexible wire waveguides represent a minimally invasive technology for the treatment of chronic total occlusions and in other tissue ablation applications. Tissue disruption is reported to be caused by repetitive mechanical contact and cavitation. This work focuses on the effects of vibrating wire waveguides in contact with arterial tissue. An apparatus with clinically relevant parameters was used, characterized as operating at 22.5 kHz and delivering amplitudes of vibration of 17.8–34.3 μm (acoustic intensity, : 1.03–3.83 W/cm ) via 1.0-mm diameter waveguides. Inertial cavitation (in water at 37 °C) was determined to occur above amplitudes of vibration greater than 31.4 μm (  = 3.21 W/cm ). The energized waveguides were advanced through tissue samples (porcine aorta) and the force profiles were measured for a range of acoustic intensities. The results show that the tissue perforation initiation force, perforation initiation energy, and total energy required to perforate the tissue reduces with increasing acoustic intensity. No significant reduction in perforation force or energy was observed in the inertial cavitation region. Multistage perforation was evident through the force profile and histological examination of the tissue samples post wire waveguide perforation.
Autors: Wylie, M. P.;McGuinness, G. B.;Gavin, G. P.;
Appeared in: IEEE Transactions on Biomedical Engineering
Publication date: Apr 2012, volume: 59, issue:4, pages: 1101 - 1108
Publisher: IEEE
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» Increasing the bandwidth of the width-split piezoelectric energy harvester
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Autors:
Appeared in: Microelectronics Journal
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Increasing Tuition's Affordability
Abstract:
Universities around the country are working in a challenging fiscal environment to find ways to make college affordable while increasing educational quality, outcomes, and accessibility.
Autors: Hodge, David C.;
Appeared in: Computer
Publication date: Apr 2012, volume: 45, issue:4, pages: 86 - 88
Publisher: IEEE
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» Independent component analysis based on first-order statistics
Abstract:


Autors:
Appeared in: Signal Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Independent vector analysis for convolutive blind noncircular source separation
Abstract:


Autors:
Appeared in: Signal Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Index based optimal anatomy of a metamorphic manipulator for a given task
Abstract:


Autors:
Appeared in: Robotics and Computer-Integrated Manufacturing
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Index Codes for Multibiometric Pattern Retrieval
Abstract:
In a biometric identification system, the identity corresponding to the input data (probe) is typically determined by comparing it against the templates of all identities in a database (gallery). Exhaustive matching against a large number of identities increases the response time of the system and may also reduce the accuracy of identification. One way to reduce the response time is by designing biometric templates that allow for rapid matching, as in the case of IrisCodes. An alternative approach is to limit the number of identities against which matching is performed based on criteria that are fast to evaluate. We propose a method for generating fixed-length codes for indexing biometric databases. An index code is constructed by computing match scores between a biometric image and a fixed set of reference images. Candidate identities are retrieved based on the similarity between the index code of the probe image and those of the identities in the database. The proposed technique can be easily extended to retrieve pertinent identities from multimodal databases. Experiments on a chimeric face and fingerprint bimodal database resulted in an 84% average reduction in the search space at a hit rate of 100%. These results suggest that the proposed indexing scheme has the potential to substantially reduce the response time without compromising the accuracy of identification.
Autors: Gyaourova, A.;Ross, A.;
Appeared in: IEEE Transactions on Information Forensics and Security
Publication date: Apr 2012, volume: 7, issue:2, pages: 518 - 529
Publisher: IEEE
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» Index Guiding Photonic Liquid Crystal Fibers for Practical Applications
Abstract:
Photonic liquid crystal fibers (PLCFs) can be categorized in two principal groups: index guiding PLCFs and photonic bandgap PLCFs. In this paper we focus on index guiding PLCFs in which effective refractive index of the micro structured cladding filled with liquid crystal is lower than refractive index of the fiber core. In these fibers broadband propagation of light is observed and also effective tuning of guiding properties is possible. In this paper PLCFs with tunable attenuation, retardation and polarization dependent losses are reported. We also enumerate some potential applications of index-guiding PLCFs, together with discussion of few technical issues important in the context of future development (i.e., effective electrical steering and connecting with standard fibers).
Autors: Ertman, S.;Rodriaguez, A. H.;Tefelska, M. M.;Chychlowski, M. S.;Pysz, D.;Buczynaski, R.;Nowinowski-Kruszelnicki, E.;Dabrowski, R.;Wolinski, T. R.;
Appeared in: Journal of Lightwave Technology
Publication date: Apr 2012, volume: 30, issue:8, pages: 1208 - 1214
Publisher: IEEE
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» Indian authorities unite on biometric enrolment
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Autors:
Appeared in: Biometric Technology Today
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Indian biometrics market to grow 42.4% by 2014
Abstract:


Autors:
Appeared in: Biometric Technology Today
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Indian government urged to 'reconsider and review' unique ID scheme
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Autors:
Appeared in: Biometric Technology Today
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Indication of Intrinsic Macroscopic Forces Affecting Magnetic Properties of Fe-Nb/Mo-Cu-B-Si Ribbons
Abstract:
Si-rich (at.% ) Fe-Nb/Mo-Cu-B-Si nanocrystalline ribbons are already successfully used in industry. Still the impact of intrinsic macroscopic stresses on magnetic anisotropy is not known in enough detail. Domain structure, hysteresis loops and surface chemistry have been studied in the as-annealed (nanocrystalline) state as well as the response to surface removal by etching. Creep-induced anisotropy established during annealing was found to be the essential source of the observed anisotropy. Apparently smooth gradient of transversal to longitudinal creep-induced anisotropy was identified from air-side center across the ribbon width as well as across the ribbon thickness. The relative rise of transversal anisotropy due to surface removal points to different surface etching efficiency. Raman spectroscopy confirmed the presence of ferrous oxides on both the ribbon surfaces. The existence of a defined oxide layer generating the macroscopic stress was not indicated.
Autors: Butvinova, B.;Butvin, P.;Kuzminski, M.;Kadlecikova, M.;Slawska-Waniewska, A.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1340 - 1343
Publisher: IEEE
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» Indirect cube: A power-efficient topology for compute clusters
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Autors:
Appeared in: Optical Switching and Networking
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Indirect Robust Control of Spacecraft via Optimal Control Solution
Abstract:
A new method is proposed for robust control of spacecraft in proximity orbit servicing operations from an optimal control formulation. It can be shown that the robust control of the nonlinear uncertain system is equivalent to the optimal controlled nominal system with a modified cost functional including uncertainty bounds such that both stabilization and optimal performance can be achieved. The $theta$-D technique is utilized to design a closed-form control law, which facilitates the onboard implementation. The pursuer spacecraft is controlled to autonomously approach a target at a specified safe relative position and align its docking port towards the one on the target while keeping their attitude synchronized. Flexible motion, parameter uncertainties, and external disturbance are considered in the control design to enhance the robustness.
Autors: Xin, Ming;Pan, Hejia;
Appeared in: IEEE Transactions on Aerospace and Electronic Systems
Publication date: Apr 2012, volume: 48, issue:2, pages: 1798 - 1809
Publisher: IEEE
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» Industrially oriented voice control system
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Autors:
Appeared in: Robotics and Computer-Integrated Manufacturing
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Inertial effects on good conductors: Resistive heating and magnetic diffusion
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Autors:
Appeared in: International Journal of Engineering Science
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Infinite chains of kinematic points
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Autors:

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Appeared in: Automatica
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Influence of Annealing Temperature and Atmosphere on Surface Microstructure and Magnetism in FINEMET-Type FeSiNbCuB Ribbons
Abstract:
Paper is primarily devoted to the surface investigations of the FINEMET-type ribbons. As-quenched (AQ) samples were subsequently annealed at different temperatures from 733 K to 923 K in vacuum and hydrogen in order to follow the influence of both treatment parameters on microstructure and magnetic properties. Two-phase magneto-optical (MO) hysteresis loops observed at AQ ribbons correspond to an amorphous structure composed of clusters of the size in units of nm (calculated from XRD). The annealing temperatures are responsible for the origin of the -Fe and/or -Fe(Si) nanocrystals of various size formed at the surface and consequently penetrating into the ribbon volume while the atmospheres influence surface oxidation. An interesting occurrence of the asymmetric reversal of longitudinal magnetization, clearly observed after annealing at 733 K and 743 K, is discussed from the viewpoint of quadratic magneto-optical effects. The loop asymmetry decreases with increasing annealing temperature and disappears at 923 K.
Autors: Zivotsky, O.;Jiraskova, Y.;Hendrych, A.;Matejka, V.;Klimsa, L.;Bursik, J.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1367 - 1370
Publisher: IEEE
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» Influence of cadmium concentration on the optical and structural properties of cadmium selenide thin films
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Autors:
Appeared in: Materials Science in Semiconductor Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Influence of Crystal Orientation on Magnetic Properties in 3% Silicon Steel With Ultra-High Tension TiN Coating
Abstract:
The influence of the tile angle of the [001] out of crystal surface on iron loss improvement of 3 % Si steel single crystals was investigated. This iron loss improvement was caused by tensile stress effect of TiN coating and domain refinement. When angle was less than 3 degrees, both eddy current loss and hysteresis loss decrease. Extremely low iron loss was obtained, when angle equal to about 2 degrees. On the other hand, when angle is more than 3 degrees, the hysteresis loss increased though the eddy current loss decreased by TiN coating. As a result, change in iron loss was small after TiN coating and domain refining. Therefore, it was clarified that the iron loss improving methods, such as domain refining and ultra-high tension coating, were effective especially in grain oriented electrical steel whose angle is less than 3 degrees.
Autors: Shingaki, Y.;Okabe, S.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1469 - 1472
Publisher: IEEE
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» Influence of Cutting Techniques on Magnetostriction Under Stress of Grain Oriented Electrical Steel
Abstract:
The magnetostriction of Epstein strips of 0.30 mm thick grain oriented electrical steel cut using three techniques was measured under longitudinal applied stress. Commercially available guillotining, electrical discharge machining, and laser cutting techniques were used. The parameter used to determine their effect was the stress shift of the peak to peak magnetostriction. The increase in the magnetostriction, especially under compressive stress, is related to the appearance of domain stress patterns on the strip surface. Hence, to investigate and correlate the cutting stress with the shift of the curve of magnetostriction against stress, static domain observations were carried out. The results from the magnetostriction under stress measurements show that all utilized cutting techniques set up compressive stress in the strips indicated by a shift of magnetostriction stress sensitivity curves, stress domain patterns on the strips surface, and distortion of B-H loop characteristics.
Autors: Klimczyk, P. K.;Anderson, P.;Moses, A.;Davies, M.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1417 - 1420
Publisher: IEEE
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» Influence of discrete dopant on quantum transport in silicon nanowire transistors
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Autors:
Appeared in: Solid-State Electronics
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Influence of Field Decrements on the Relaxation Behavior of Thin High- Superconductors Measured Using a Levitation Balance
Abstract:
Conventional relaxation measurements on various samples (a thin film, a -coated conductor, and a tape) using a levitation balance are presented that are measured after a departure from the critical state by means of a small retraction of the permanent magnet, which corresponds to a small field reduction . In the case of , flux creep rates are found to decrease with increasing until a small plateau is reached, where flux creep is effectively stopped. A further increase in before the relaxation measurement leads to a change of sign of the creep rate. For the tape, only a continuous decrease in is obtained. An explanation of this effect is given based on calculations of flux density profiles and critical current densities in perpendicular geometry. The differences to the Bean model (i.e., longitudinal geometry) are discussed.
Autors: Koblischka, M. R.;Meiser, J.;Hartmann, U.;
Appeared in: IEEE Transactions on Applied Superconductivity
Publication date: Apr 2012, volume: 22, issue:2, pages: 8200108 - 8200108
Publisher: IEEE
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» Influence of mixing proportion on the solid-state anaerobic co-digestion of distiller's grains and food waste
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Autors:
Appeared in: Biosystems Engineering
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Influence of Parallel Paths on Current-Regulated Sine-Wave Interior-Permanent-Magnet Machines With Rotor Eccentricity
Abstract:
The behavior of rotor eccentricities in current-regulated interior-permanent-magnet machines is investigated. The study focuses on two typical topologies of significant industrial relevance: machines with distributed windings with two slots per pole and phase and motors with concentrated coils and three slots per pole pair. The effect of stator-winding parallel paths is examined for both cases. Coil and terminal electrical quantities and radial forces were simulated using finite-element analysis. Unbalanced operation, where the currents are not equal in parallel phase connections due to eccentricity, is also investigated. Experimental measurements of electrical quantities and forces on motors with static eccentricity are carried out using two special test setups. The experimental measurements validated the simulation results.
Autors: Brown, I. P.;Ionel, D. M.;Dorrell, D. G.;
Appeared in: IEEE Transactions on Industry Applications
Publication date: Apr 2012, volume: 48, issue:2, pages: 642 - 652
Publisher: IEEE
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» Influence of Plasticity on Magnetic and Magnetostrictive Behaviors of Dual-Phase Steel
Abstract:
Magnetic and magnetostrictive behaviors of magnetic materials are very sensitive to mechanical stress and especially to plastic deformation. A model based on the decomposition of a plastified material into mechanically hard and soft phases has been proposed. An appropriate experimental procedure is presented in order to validate the model. The magnetic and magnetostrictive behaviors of a dual-phase steel are carried out. Measurements are made at unloaded stress and under various applied stress to observe a recovery phenomenon predicted by the modeling. Experiments and modeling are compared.
Autors: Lazreg, S.;Hubert, O.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1273 - 1276
Publisher: IEEE
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» Influence of Soft Magnetic Material in a Permanent Magnet Synchronous Machine With a Commercial Induction Machine Stator
Abstract:
This paper presents the efficiency study of a 6-pole and 2-pole induction motor (IM), converted into a 6-pole and 2-pole permanent magnet synchronous machine (PMSM). Firstly, the stator of the IM was kept unchanged and the rotor was converted into a permanent magnet (NdFeB magnets) rotor, resulting in higher average efficiency. Secondly, we investigated how much the efficiency can be increased by replacing the electrical steel in the stator by another material grade. The numerical approach is based on the finite element method (FEM), taking into account the rotor movement. Iron losses are computed according to the loss separation theory. From measurements and simulations, it is observed that the efficiency increases significantly compared to the original IM. The average efficiency of the original 1.5 kW IM converted into the 1.5 kW PMSM led to a 14% higher efficiency in a speed range and torque range . When the stator iron is replaced by M235-35A laminations with the same geometry, the average efficiency increases by an additional 2% for the 1.5 kW PMSM with modified stator.
Autors: Hofman, I.;Sergeant, P.;Van den Bossche, A.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1645 - 1648
Publisher: IEEE
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» Influence of Strand Design, Boron Type, and Carbon Doping Method on the Transport Properties of Powder-in-Tube Strands
Abstract:
The transport properties of a number of strands have been investigated in terms of their response to strand design, starting B powder choice, and the approach to C doping used. The strands had the following various designs: 1) several chemical barriers were introduced, i.e., Fe and Nb; 2) the strands were encased in various outer sheath materials, i.e., monel, Cu monel, monel glidcop, and Nb monel; 3) the filament counts were varied (1, 18, and 36); and 4) the final strand diameter was varied. In addition, for a subset of the strand designs, several B powder and C-dopant types were investigated. In particular, the following two types of amorphous B powder were used: 1) Moissan-based Tangshan boron from Tangshan Weihao Magnesium Powder Company Ltd., Tangshan, Hebei, China, and 2) SMI boron from Specialty Metals Inc., Huntington, WV, USA, which is produced in a plasma torch by the reduction-by-hydrogen of . The following two approaches to C doping were taken: 1) malic-acid treatment, in which C is introduced into the B powder precursor by the moderate temperature drying out a slurry of B mixed in with a malic acid–toluene solution (during which the malic acid decomposes, leaving C as the only solid residue) before the Mg powder is mixed in, and 2) direct C doping of the SMI-produced B by introducing a known percentage of into the plasma flame. Critical current densities were measured on 1.5-m-long samples at 4.2 K in fields of up to 14- T. Of all the strands measured, the strand doped with SMI-C at a nominal 4 mol% C yielded the highest values, e.g., at 7 T, at 10 T, and at 12 T. The -values are given for all strands at 5 and 10 T, and for a certain set of strands, the magnetic field dependencies of the -values and the influence of C doping is presented. Finally, we demonstrate that, over a wide range of , linearly decreases with with a slope such that the of any strand can be parameterized in terms of and its zero-field intercept .
Autors: Yang, Y.;Susner, M. A.;Sumption, M. D.;Rindfleisch, M.;Tomsic, M.;Collings, E. W.;
Appeared in: IEEE Transactions on Applied Superconductivity
Publication date: Apr 2012, volume: 22, issue:2, pages: 6200110 - 6200110
Publisher: IEEE
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» Influence of Stress on Vector Magnetic Property Under Rotating Magnetic Flux Conditions
Abstract:
Electrical steel sheets, which are used in real rotating machinery, are magnetized under alternating and rotating magnetic flux conditions. In addition, the magnetic properties of the electrical steel sheets are strongly affected by stress. Therefore, it is important to understand the magnetic properties under different mechanical stress and magnetic flux conditions, that are based on phenomenon in the real rotating machinery. This paper presents the effect of stress on the vector magnetic property under the rotating magnetic flux conditions with a developed measurement system. We investigate the behavior of the vector magnetic property of a nonoriented electrical steel under the rotating magnetic flux condition by applying mechanical stress along the rolling direction.
Autors: Kai, Y.;Tsuchida, Y.;Todaka, T.;Enokizono, M.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1421 - 1424
Publisher: IEEE
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» Influence of substrate on the growth of microcrystalline silicon thin films deposited by plasma enhanced chemical vapor deposition
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Autors:
Appeared in: Materials Science in Semiconductor Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Influence of Surface Recombination on Forward Current–Voltage Characteristics of Mesa GaN Diodes Formed on GaN Free-Standing Substrates
Abstract:
The influence of surface recombination on forward current–voltage ( ) characteristics of gallium nitride (GaN) diodes formed on GaN free-standing substrates was both experimentally and computationally investigated. In the temperature range of 373−273 K, the surface-recombination velocity of overetched circular-mesa diodes was derived, respectively, as and for diodes with and without a mesa-field-plate termination structure consisting of dielectric and metal layers. It was shown that is dominated by carrier recombination at the side surface of the etched . The characteristics of the fabricated diodes were compared with the reported GaN diodes with almost-zero overetched depth of . The large of the lat- er diodes is attributed to enhanced photon recycling through photon reflection at the metal mirror. Moreover, reducing to less than is considered indispensible for achieving similar enhanced photon recycling in overetched terminated diodes.
Autors: Mochizuki, K.;Nomoto, K.;Hatakeyama, Y.;Katayose, H.;Mishima, T.;Kaneda, N.;Tsuchiya, T.;Terano, A.;Ishigaki, T.;Tsuchiya, T.;Tsuchiya, R.;Nakamura, T.;
Appeared in: IEEE Transactions on Electron Devices
Publication date: Apr 2012, volume: 59, issue:4, pages: 1091 - 1098
Publisher: IEEE
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» Influence of the SET current on the resistive switching properties of tantalum oxide created by oxygen implantation
Abstract:
Resistive memory devices fabricated from oxygen implanted tantalum exhibited bipolar switching without a forming voltage. The influence of the current limit during SET on the switching properties has been studied using endurance measurements. The SET/RESET voltages did not change with the current limit. The RESET current increased proportionally to the SET current, while the on-state resistance varied inversely to the SET current. These results are consistent with a RESET process that is directly linked to the peak power during SET. The trade-off between the switching endurance and memory window that results from the SET process is also shown.
Autors: Bishop, S. M.;Bakhru, H.;Capulong, J. O.;Cady, N. C.;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:14, pages: 142111 - 142111-4
Publisher: IEEE
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» Influence of Thickness on Magnetic Properties of Electrolytic Ni-Fe Films Deposited on Cu Wires
Abstract:
The influence of film thickness on magnetic properties of Ni-Fe films electroplated under tensile stress on 50 Cu wires is investigated by means of hysteresis loops, FMR (ferromagnetic resonance) and MI (magnetoimpedance) measurements. With increasing thickness the coercive force and the remanence ratio decrease. The MI and network analyzer-FMR (NA-FMR) measurements indicate the presence of a strong uniaxial anisotropy along the wire axis in the thin films. With increasing film thickness the anisotropy gradually changes to the hard-wire-axis anisotropy. While the hard-axis anisotropy of thick films can be ascribed to the magnetoelastic coupling with the compressive back-stresses in the Ni-Fe layer, the easy-axis anisotropy of thin films is probably due to the surface anisotropy at the Ni-Fe/Cu interface.
Autors: Kraus, L.;Chayka, O.;Frait, Z.;Vazquez, M.;
Appeared in: IEEE Transactions on Magnetics
Publication date: Apr 2012, volume: 48, issue:4, pages: 1348 - 1351
Publisher: IEEE
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» Influence of Voltage and Frequency Dimming on Power Losses in HF Electronic Ballasts for Compact Fluorescent Lamps
Abstract:
Compact fluorescent lamps (CFLs) incorporating electronic ballasts are widely used in lighting. In many cases, the ability to dim the lamp is a requirement. Dimming can be achieved by varying the switching frequency of the inverter or by changing the voltage supplied to the inverter. The effect of dimming by both approaches on the power losses in the inverter is studied in this work. The lamp and associated inverter has been modeled in Pspice, using a behavioral model for the CFL. Predicted losses are in good agreement with experimental data obtained from calorimetry. After verification, the model was then used to determine the distribution of losses within the inverter, enabling a comparison of the effects of the two dimming methods to be made.
Autors: Shafi, M. A.;McMahon, R. A.;
Appeared in: IEEE Transactions on Industry Applications
Publication date: Apr 2012, volume: 48, issue:2, pages: 839 - 845
Publisher: IEEE
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» Influence of voltage dips on industrial equipment: Analysis and assessment
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Autors:
Appeared in: International Journal of Electrical Power & Energy Systems
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Influence of work-function of top electrodes on the photovoltaic characteristics of Pb0.95La0.05Zr0.54Ti0.46O3 thin film capacitors
Abstract:
Photovoltaic properties of Pb0.95La0.05Zr0.54Ti0.46O3 thin film capacitors prepared using solution based method with metal top electrodes having different work functions are investigated in this work. It is shown that by using aluminum, a low work-function metal, as top electrode, the magnitude of photo voltage as well as photo current can be enhanced. More than one magnitude enhancement in the photovoltaic efficiency is observed with Al as top electrode compared to Pt electrodes. This work clearly highlights that an appropriate choice of low work function metal electrode can enhance the photovoltaic response of the ferroelectric thin film capacitors.
Autors: Harshan, V. N.;Kotru, Sushma;
Appeared in: Applied Physics Letters
Publication date: Apr 2012, volume: 100, issue:17, pages: 173901 - 173901-4
Publisher: IEEE
Full litterature document
 
» Information Efficiencies of Parametric Devices
Abstract:
In this paper, studies are made of the information efficiencies of optical amplifiers, attenuators, and frequency convertors. Attenuators always reduce the amount of information carried by a signal. In contrast, parametric amplifiers and frequency convertors redistribute information between the signal and idler sidebands, but preserve the total information. Homodyne detection of the sideband quadratures degrades their signal-to-noise ratios. Detection always reduces the back-to-back and converted information capacities by moderate amounts, which do not depend on how the input information is encoded. The effects of detection on the amplified information capacity can be small or large, depending on how the input information is encoded. For (standard) two-sideband amplifiers, it is best to encode correlated information in both sidebands.
Autors: McKinstrie, C. J.;Alic, N.;
Appeared in: IEEE Journal of Selected Topics in Quantum Electronics
Publication date: Apr 2012, volume: 18, issue:2, pages: 794 - 811
Publisher: IEEE
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» Informed source separation through spectrogram coding and data embedding
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Autors:
Appeared in: Signal Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
Full litterature document
 
» Injection Power and Detuning-Dependent Bistability in Fabry–Perot Laser Diodes
Abstract:
In this paper, we investigate the range of injection power and frequency detuning for which bistability of the injection-locked semiconductor Fabry–Perot laser diode can be achieved and preserved. The analysis is based on a detailed model of the multimode rate equations and material gain. The stationary analysis shows that there is a region of the injection power and detuning for which the laser has three stationary states. However, the stability analysis shows that for a wide range of injection powers and detuning, the two of three stationary states are stable and provide bistability. One of these states is the result of injection locking, whereas the other is mainly a consequence of the interplay between injection-locked and unlocked modes. The difference of the side-mode-suppression ratio between the stable states is of the order of 20 dB and it can increase with detuning and decrease with mode order.
Autors: Krstić, M. M.;Crnjanski, J. V.;Gvozdić, D. M.;
Appeared in: IEEE Journal of Selected Topics in Quantum Electronics
Publication date: Apr 2012, volume: 18, issue:2, pages: 826 - 833
Publisher: IEEE
Full litterature document
 
» Inkjet-printed polymer-fullerene blends for organic electronic applications
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Appeared in: Microelectronic Engineering
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» InN and ln1-XGaX N: calculation of hall mobilities and effects of alloy disorder and dislocation scatterings
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Graphical Abstract

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Appeared in: Materials Science in Semiconductor Processing
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» InP HBT Transferred to Higher Thermal Conductivity Substrate
Abstract:
We report the first demonstration of an InP double heterojunction bipolar transistor (HBT) transferred to a higher thermal conductivity substrate. This process allows lithographic access to both the frontside and backside of the device to minimize parasitic capacitances while transfer to a SiC substrate should reduce junction temperature by 42%, allowing for higher current density operation. The emitter-area HBT has peak common–emitter current gain and breakdown . No electrical degradation from the transferred-substrate process is observed. RF measurements show device peak , , and maximum available gain (MAG) at 100 GHz is 15.3 dB.
Autors: Scott, D. W.;Monier, C.;Wang, S.;Radisic, V.;Nguyen, P.;Cavus, A.;Deal, W. R.;Gutierrez-Aitken, A.;
Appeared in: IEEE Electron Device Letters
Publication date: Apr 2012, volume: 33, issue:4, pages: 507 - 509
Publisher: IEEE
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» Input Domain Reduction through Irrelevant Variable Removal and Its Effect on Local, Global, and Hybrid Search-Based Structural Test Data Generation
Abstract:
Search-Based Test Data Generation reformulates testing goals as fitness functions so that test input generation can be automated by some chosen search-based optimization algorithm. The optimization algorithm searches the space of potential inputs, seeking those that are “fit for purpose,” guided by the fitness function. The search space of potential inputs can be very large, even for very small systems under test. Its size is, of course, a key determining factor affecting the performance of any search-based approach. However, despite the large volume of work on Search-Based Software Testing, the literature contains little that concerns the performance impact of search space reduction. This paper proposes a static dependence analysis derived from program slicing that can be used to support search space reduction. The paper presents both a theoretical and empirical analysis of the application of this approach to open source and industrial production code. The results provide evidence to support the claim that input domain reduction has a significant effect on the performance of local, global, and hybrid search, while a purely random search is unaffected.
Autors: McMinn, Phil;Harman, Mark;Lakhotia, Kiran;Hassoun, Youssef;Wegener, Joachim;
Appeared in: IEEE Transactions on Software Engineering
Publication date: Apr 2012, volume: 38, issue:2, pages: 453 - 477
Publisher: IEEE
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» Input impedance analysis of dielectric covered/loaded biconical antennas using mode-matching theory
Abstract:


Autors:
Appeared in: AEU - International Journal of Electronics and Communications
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Input to State Stabilizing Controller for Systems With Coarse Quantization
Abstract:
We consider the problem of achieving input-to-state stability (ISS) with respect to external disturbances for control systems with quantized measurements. Quantizers considered in this paper take finitely many values and have an adjustable “center” and “zoom” parameters. Both the full state feedback and the output feedback cases are considered. Similarly to previous techniques from the literature, our proposed controller switches repeatedly between “zooming out” and “zooming in.” However, here we use two modes to implement the “zooming in” phases, which allows us to attenuate an unknown disturbance while using the minimal number of quantization regions. Our analysis is trajectory-based and utilizes a cascade structure of the closed-loop hybrid system. We further show that our method is robust to modeling errors using a specially adapted small-gain theorem. The main results are developed for linear systems, but we also discuss their extension to nonlinear systems under appropriate assumptions.
Autors: Sharon, Y.;Liberzon, D.;
Appeared in: IEEE Transactions on Automatic Control
Publication date: Apr 2012, volume: 57, issue:4, pages: 830 - 844
Publisher: IEEE
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» INS/GPS Integration System using Adaptive Filter for Estimating Measurement Noise Variance
Abstract:
The inertial navigation system (INS)/GPS integration system is designed by employing an adaptive filter that can estimate measurement noise variance using the residual of the measurement. To verify the efficiency of the proposed loosely-coupled INS/GPS integration system, simulations were performed by assuming that GPS information has large position errors. The simulation results show that the proposed integration system with the adaptive filter is more effective in estimating the position and attitude errors than a system that uses the extended Kalman filter.
Autors: Yu, Myeong-Jong;
Appeared in: IEEE Transactions on Aerospace and Electronic Systems
Publication date: Apr 2012, volume: 48, issue:2, pages: 1786 - 1792
Publisher: IEEE
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» Inside Front Cover (Aims & Scope, Editors)
Abstract:


Autors:
Appeared in: Advanced Powder Technology
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Inside Front Cover - Editorial Board
Abstract:


Autors:
Appeared in: Microelectronic Engineering
Publication date: Apr 2012
Publisher: Elsevier B.V.
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» Inside front cover - Editorial board
Abstract:


Autors:
Appeared in: Microelectronics Reliability
Publication date: Apr 2012
Publisher: Elsevier B.V.
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