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从STS-134和空间操作仿真中心两方面来评测奥利翁视觉导航传感器的性能
The Orion Multi-Purpose Crew Vehicle is a new spacecraft being designed by NASA and Lockheed Martin for future crewed exploration missions. The Vision Navigation Sensor is a Flash LIDAR that will be the primary relative navigation sensor for this vehicle. To obtain a better understanding of this sensor's performance, the Orion relative navigation team has performed both flight tests and ground tests. This paper summarizes and compares the performance results from the STS-134 flight test, called the Sensor Test for Orion RelNav Risk Mitigation (STORRM) Development Test Objective, and the ground tests at the Space Operations Simulation Center.
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自旋进动有机磁传感器
SRI International, in collaboration with Professor Jing Shih of the University of California- Riverside (UCR), Professor Nathan Newman of Arizona State University (ASU), and Professor Edmond Nowak of the University of Delaware (UD), has been funded (from June 2009 through September 2012) through ONR Contract (N00014-09-C-0292) to fabricate a magnetic sensor with a half- metallic ferromagnet (FM) contact and polymers and demonstrate its sensing capability. In this study we considered La0.7Sr0..3MnO3 (LSMO) and CoFe50Al25Si25 (CFAS) alloys for half-metallic FM contacts and poly(3,4- ethylenedioxythiophene) (PEDOT) and poly-3(hexylthiophene) (P3HT) for polymers. Room temperature operation of this ultrasensitive device requires half-metallic ferromagnetic contacts with high Curie temperature (Tc), ultra- lowmobilitypolymer with very high doping density, nano-scale trenches, successful charge and spin injection into polymers from FM half-metal contacts, and spin precession in polymers. The FM films for vertical and lateral devices were grown at UCR and ASU, respectively. Most device fabrication was carried out at SRI, while magnetic and noise measurements were performed at ASU and UD.
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全面整合互补金属氧化物半导体(CMOS)Bio-Assay平台
We present a post-processed 6.25mm2 0.18μm Complementary Metal OxideSemiconductor (CMOS) platform that leverages the advantages of super-paramagneticbead labeling to integrate on-chip the label separation and detection functionalitiesrequired for high sensitivity bio-assays. The surfaces of the CMOS chip and of themagnetic beads are functionalized with bio-chemicals complementary to a target analyte.In a sandwich capture format, the presence of the target analyte will strongly bind 4.5μmmagnetic bead labels to the surface of the chip. The undesired background signal isminimized by the removal of the unbound magnetic beads from the detection array viamagnetic forces generated on-chip. The remaining strongly bound magnetic beads arerespectively magnetized and detected by an array of 128 stacked micro-coil/Hall sensorelements. This single chip solution does not require any external components like pumps,valves or electromagnets and is capable of detecting purified Human antibodies down toconcentrations of 100pg/ml as well as anti-Dengue antibodies in human serum samples.
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对于先进飞机的仅识别传感器的结构健康监测
Environmental conditions, cyclic loading, and aging contribute to structural wear and degradation, and thus potentially catastrophic events. The challenge of health monitoring technology is to determine incipient changes accurately and efficiently. This project addresses this challenge by developing health monitoring techniques that depend only on sensor measurements. Since actively controlled excitation is not needed, sensor-to-sensor identification (S2SID) provides an in-flight diagnostic tool that exploits ambient excitation to provide advance warning of significant changes. S2SID can subsequently be followed up by ground testing to localize and quantify structural changes. The conceptual foundation of S2SID is the notion of a pseudo-transfer function, where one sensor is viewed as the pseudo-input and another is viewed as the pseudo-output, is approach is less restrictive than transmissibility identification and operational modal analysis since no assumption is made about the locations of the sensors relative to the excitation.
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皮质Microstimulation神经假体
Brain-controlled prostheses have the potential to improve the quality of life of a large number of paralyzed persons by allowing them to control prosthetic limbs simply by thought.An essential requirement for natural use of such neural prostheses is that the user should be provided with somatosensory feedback from the artificial limb. This can be achieved by electrically stimulating small populations of neurons in the cortex; a process known as cortical microstimulation. This dissertation describes the development of novel technologies for experimental neuroscience and their use to explore the neural and perceptual effects of cortical microstimulation in rodents.