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4221.伯克利传感器及致动中心分解:NSF有关MEMS的产学合作研究
[电气机械和器材制造业] [2014-03-15]
The Berkeley Sensor & Actuator Center at the University of California Berkeley has, for more than twenty‐five years, had a major impact on the research foundations and consequent commercialization of MEMS and NEMS. This has been achieved through creative combinations of resources, incentives, and shared goals involving Academia, Industry, and Government. The strongly multidisciplinary and interdisciplinary operational model of BSAC (a National Science Foundation Industry/University Cooperative Research Center) is described.
关键词:致动器;传感器;机电系统;Mems(微型机电系统);Nems(纳米机电系统)
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4222.植入式心脏除颤器评估及其防止心脏性猝死的证明(技术评估报告)
[专用设备制造业] [2014-03-15]
There is a high strength of evidence that ICD therapy for primary prevention of SCD, versus no ICD therapy, shows benefit with regard to all cause mortality and SCD in patients with reduced left ventricular ejection fraction and ischemic or nonischemic cardiomyopathy beyond the immediate post-MI or coronary revascularization periods. Studies failed to show statistically significant differences for all-cause mortality across subgroups. There is insufficient evidence for all-cause mortality for patients who receive CRT-Ds versus ICD alone for primary prevention. There is high strength of evidence that in-hospital adverse events are infrequent (1-3%) and moderate strength of evidence that up to one-fifth of patients receive inappropriate shocks from the ICDs.
关键词:心血管疾病;医疗设备;技术评估;心脏病;心律失常(心脏);除颤器
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4223.航空安全军事援助:通用军事与顾问结合
[铁路、船舶、航空航天和其他运输设备制造业] [2014-03-15]
This thesis was written to satisfy graduation requirements from the Joint Advance Warfighting School at the Joint Forces Staff College, Norfolk, VA. The thesis argues that the Services must develop an integrated and coordinated joint methodology to organize and train general purpose forces (GPF) as air advisors for fixed-wing and rotary-wing aviation security force assistance (AvSFA) missions. It also proposes a joint solution to flexibly increase the depth and breadth of GPF air advisor capability without burdening the Services with creating additional force structure. The core of the proposed joint solution is to create Joint GPF AvSFA Unit Type Codes (UTCs). Upon implementation, the Services will possess taskable packages of GPF fixed-wing, rotary-wing, and aviation support capability. These three AvSFA UTCs could be used independently or employed in concert to support the theater campaign plans of the geographic combatant commands. Eight recommendations result from the thesis. The three primary recommendations are to adopt the proposal, to identify a lead Service to chair joint implementation, and to convene a joint working group to determine the precise composition of the recommended GPF AvSFA UTCs.
关键词:空中力量;军事顾问;固定翼飞机;军事援助;军事训练;旋转翼
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4224.促进NASA燃料废气的自动操作技术
[铁路、船舶、航空航天和其他运输设备制造业] [2014-03-15]
This paper discusses the importance of implementing advanced autonomous technologies supporting operations of future NASA missions. The ability for crewed, uncrewed and even ground support systems to be capable of mission support without external interaction or control has become essential as space exploration moves further out into the solar system. The push to develop and utilize autonomous technologies for NASA mission operations stems in part from the need to reduce operations cost while improving and increasing capability and safety. This paper will provide examples of autonomous technologies currently in use at NASA and will identify opportunities to advance existing autonomous technologies that will enhance mission success by reducing operations cost, ameliorating inefficiencies, and mitigating catastrophic anomalies.
关键词:自治;太空探索;自适应控制;探险车;机器人;自动控制
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4225.超分辨率视觉系统发展测试中的大气特征
[信息传输、软件和信息技术服务业] [2014-03-15]
The Super-Resolution Vision System is a DARPA-sponsored project designed to create an imaging system that can “see” more sharply through optical turbulence. The system has integrated several image processing techniques into a modular package. To test the system, measurements of optical targets at ranges up to 2 km were collected at White Sands Missile Range, NM, between 13 and 15 November, 2012. This report documents the atmospheric characterization performed in support of that test to measure winds and turbulence strength present. Weather conditions during much of the test period were dry and clear, except during the afternoon of November 15. Turbulence strength (C2n) reached 2 × 10?13 m?2/3 during much of the daylight hours (0900 to 1500), providing a stressing environment for much of the testing period. Meteorological data were collected from 0630 through 1630 local time each day of the test. RM Young 81000 sonic anemometers were located at 0-, 800-, and 1800-m target points at 1.5-m elevation to provide point estimates of C2 n. Sonic anemometer data were also collected at a 0-km tower at several levels, providing a vertical turbulence profile. Turbulence data were also collected optically using scintillometers over 800- and 1800-m paths.
关键词:大气运动;光学;声学数据;风速计;高分辨率;图像处理;气象数据
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4226.一阶开宇宙部分可观察马尔可夫决策过程:公式和算法
[信息传输、软件和信息技术服务业] [2014-03-14]
We examine the problem of extending a first-order, open-universe language to describe POMDPs and identify non-trivial representational issues in describing an agent’s capability for observation and action—issues that were avoided in previous work only by making strong and restrictive assumptions.
关键词:一阶概率模型;部分可观察马尔科夫决策过程;开宇宙
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4227.雷达收发器毫米波电路设计
[计算机、通信和其他电子设备制造业,信息传输、软件和信息技术服务业] [2014-03-14]
An uncommon architecture of a direct-coupled transmit/receive FMCW radar transceiver was investigated and implemented. The architecture uses a single dual polarization antenna to transmit and receive circularly polarized waves and implements a form of on-chip circulator by directing energy between common- and differential-modes on a symmetric waveguide structure.
关键词:FMCW雷达;雷达收发器;电路设计;毫米波;集成电路;balun
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4228.布局引擎并行化:树的遍历的拟合和优化
[信息传输、软件和信息技术服务业] [2014-03-14]
At the most practical level, this thesis examines how to parallelize a language for laying out visualizations. By specifying important subsets of layout languages with a restricted form of constraints over trees, we find we can abstract the problem to automatically parallelizing systems of constraints. Our solution combines language design, program synthesis, and highperformance algorithms. We introduce innovatations in each of these areas in order to build our end-to-end system.This thesis introduces techniques for parallel computing over trees and applies them to generating layout engines.
关键词:布局引擎;树的遍历;并行算法
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4229.压电式氮化铝兰姆波谐振器精频选择技术的实验研究
[计算机、通信和其他电子设备制造业,电气机械和器材制造业] [2014-03-14]
Aluminum nitride (AlN) Lamb wave resonators (LWRs) utilize piezoelectric transduction to ensure low motional resistance. The resonance frequency of a LWR is defined by interdigital transducer (IDT) pitch and is thus decoupled from the overall device dimensions. This fine frequency selection technique is enabled by adjusting the so-called AlN "overhang" dimension allowing control of relative frequency of Lamb wave resonators in an array to 0.1%. Experimental results suggest the center frequency of LWRs can be linearly adjusted by up to 5% with no significant effect on other resonator parameters includingQ,Rm,C0, andkt2. Closely and evenly spaced AlN Lamb wave resonators, without post-process trimming, demonstrate the potential to realize a pure mechanical, high performance, yet low power RF front-end system.
关键词:精频选择技术;兰姆波;谐振器;谐振器设计;悬挑
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4230.隧道场效应晶体管双层空穴的建造
[计算机、通信和其他电子设备制造业] [2014-03-14]
We analyze the tradeoff between gate efficiency versus on-state conductance to find the optimal device design.
关键词:隧道场效应晶体管;空穴;双层空穴