Computational Study of the Electronic Performance of Cross-Plane Superlattice Peltier Devices

2011 ◽  
Vol 1314 ◽  
Author(s):  
Changwook Jeong ◽  
Gerhard Klimeck ◽  
Mark Lundstrom
Keyword(s):  
Seebeck Coefficient ◽  
Computational Study ◽  
Oscillatory Behavior ◽  
Electrical Performance ◽  
Simulation Code ◽  
Performance Benchmarking ◽  
Peltier Cooler ◽  
Electronic Performance ◽  
Quantum Mechanical Effects ◽  
And Performance

ABSTRACTWe use a state-of-the-art non-equilibrium quantum transport simulation code, NEMO-1D, to address the device physics and performance benchmarking of cross-plane superlattice Peltier coolers. Our findings show quantitatively how barriers in cross-plane superlattices degrade the electrical performance, i.e. power factor. The performance of an In0.53Ga0.47As/In0.52Al0.48As cross-plane SL Peltier cooler is lower than that of either a bulk In0.53Ga0.47As or bulk In0.52Al0.48As device, mainly due to quantum mechanical effects. We find that a cross-plane SL device has a Seebeck coefficient vs. conductance tradeoff that is no better than that of a bulk device. The effects of tunneling and phase coherence between multi barriers are examined. It is shown that tunneling, SL contacts, and coherency only produce oscillatory behavior of Seebeck coefficient vs. conductance without a significant gain in PF. The overall TE device performance is, therefore, a compromise between the enhanced Seebeck coefficient and degraded conductance.

Computational Study of the Multiphase Flow and Performance of Hydrocyclones: Effects of Cyclone Size and Spigot Diameter

2013 ◽  
Vol 52 (45) ◽  
pp. 16019-16031 ◽  
Author(s):  
M. Ghodrat ◽  
S. B. Kuang ◽  
A. B. Yu ◽  
A. Vince ◽  
G. D. Barnett ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Computational Study ◽  
And Performance

scholarly journals An Investigation of the Physical and Electrical Properties of Knitted Electrodes When Subjected to Multi-Axial Compression and Abrasion

Proceedings ◽  
2021 ◽  
Vol 68 (1) ◽  
pp. 2
Author(s):  
Arash M. Shahidi ◽  
Theodore Hughes-Riley ◽  
Carlos Oliveira ◽  
Tilak Dias
Keyword(s):  
Heart Rate ◽  
Electrical Properties ◽  
Applied Load ◽  
Pressure Sensors ◽  
Electrical Performance ◽  
Electronic Textiles ◽  
Heart Rate Monitors ◽  
Mechanical Loads ◽  
And Performance ◽  
Over Time

Knitted electrodes are a key component to many electronic textiles including sensing devices, such as pressure sensors and heart rate monitors; therefore, it is essential to assess the electrical performance of these knitted electrodes under different mechanical loads to understand their performance during use. The electrical properties of the electrodes could change while deforming, due to an applied load, which could occur in the uniaxial direction (while stretched) or multiaxial direction (while compressed). The properties and performance of the electrodes could also change over time when rubbed against another surface due to the frictional force and generated heat. This work investigates the behavior of a knitted electrode under different loading conditions and after multiple abrasion cycles.

Computational study of viscous effects on lobed mixer flow features and performance

1996 ◽  
Vol 12 (3) ◽  
pp. 449-456 ◽  
Author(s):  
M. N. O'Sullivan ◽  
J. K. Krasnodebski ◽  
I. A. Waitz ◽  
E. M. Greitzer ◽  
C. S. Tan ◽  
...  
Keyword(s):  
Computational Study ◽  
Viscous Effects ◽  
Flow Features ◽  
And Performance

ICT Based Performance Measurement and Benchmarking Methodology

2020 ◽  
pp. 188-196
Author(s):  
Nadja Yang Meng ◽  
Karthikeyan K
Keyword(s):  
Best Practices ◽  
Performance Measurement ◽  
Performance Metrics ◽  
Performance Enhancement ◽  
Performance Measurements ◽  
Know How ◽  
Performance Benchmarking ◽  
Measurement Framework ◽  
And Performance ◽  
Made In

Performance benchmarking and performance measurement are the fundamental principles of performance enhancement in the business sector. For businesses to enhance their performance in the modern competitive world, it is fundamental to know how to measure the performance level in business that also incorporates telling how they will performance after a change has been made. In case a business improvement has been made, the performance processes have to be evaluated. Performance measurements are also fundamental in the process of doing comparisons of performance levels between corporations. The best practices within the industry are evaluated by the businesses with desirable levels of the kind of performance measures being conducted. In that regard, it is fundamental if similar businesses applied the same collection of performance metrics. In this paper, the NETIAS performance measurement framework will be applied to accomplish the mission of evaluating performances in business by producing generic collection of performance metrics, which businesses can utilize to compare and measure their organizational activities.

scholarly journals Implementation and performance of Barnes-hut n-body algorithm on extreme-scale heterogeneous many-core architectures

2020 ◽  
Vol 34 (6) ◽  
pp. 615-628
Author(s):  
Masaki Iwasawa ◽  
Daisuke Namekata ◽  
Ryo Sakamoto ◽  
Takashi Nakamura ◽  
Yasuyuki Kimura ◽  
...  
Keyword(s):  
Large Scale ◽  
High Efficiency ◽  
Simulation Code ◽  
Network Bandwidth ◽  
Large Numbers ◽  
Sunway Taihulight ◽  
And Performance ◽  
Extreme Scale ◽  
Many Core ◽  
New Algorithms

In this paper, we report the implementation and measured performance of our extreme-scale whole planetary ring simulation code on Sunway TaihuLight and two PEZY-SC2 systems: Shoubu System B and Gyoukou. The numerical algorithm is the parallel Barnes-Hut tree algorithm, which has been used in many large-scale astrophysical particle-based simulations. Our implementation is based on our FDPS framework. However, the extremely large numbers of cores of the systems used (10 M on TaihuLight and 16 M on Gyoukou) and their relatively poor memory and network bandwidth pose new challenges. We describe the new algorithms introduced to achieve high efficiency on machines with low memory bandwidth. The measured performance is 47.9, 10.6 PF, and 1.01PF on TaihuLight, Gyoukou and Shoubu System B (efficiency 40%, 23.5% and 35.5%). The current code is developed for the simulation of planetary rings, but most of the new algorithms are useful for other simulations, and are now available in the FDPS framework.

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