Composite materials are increasingly used in modern aircraft for reducing weight, improving fuel efficiency, and enhancing the overall design, performance, and manufacturability of airborne vehicles. Materials such as fiberglass reinforced composites (FRC) and carbon-fiber-reinforced polymers (CFRP) are being used to great advantage in airframes, wings, engine nacelles, turbine blades, fairings, fuselage and empennage structures, control surfaces and coverings. However, the potential damage from the direct and indirect effects of lightning strikes is of increased concern to aircraft designers and operators. When a lightning strike occurs, the points of attachment and detachment on the aircraft surface must be found by visual inspection, and then assessed for damage by maintenance personnel to ensure continued safe flight operations. In this paper, a new method and system for aircraft in-situ damage detection and diagnosis are presented. The method and system are based on open circuit (SansEC) sensor technology developed at NASA Langley Research Center. SansEC (Sans Electric Connection) sensor technology is a new technical framework for designing, powering, and interrogating sensors to detect damage in composite materials. Damage in composite material is generally associated with a localized change in material permittivity and/or conductivity. These changes are sensed using SansEC. Unique electrical signatures are used for damage detection and diagnosis. NASA LaRC has both experimentally and theoretically demonstrated that SansEC sensors can be effectively used for in-situ composite damage detection.

关键词：传感器；SansEC；复合材料；飞机

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Unexploded ordnance (UXO) contamination at former and current Department of Defense sites is an extensive problem. Site characterization and remediation activities conducted with the current state-of-the-art technologies at these sites often yield unsatisfactory results and are extremely expensive to implement. This is due in part to the inability of current technology to distinguish between UXO and nonhazardous items. Newly emerging electromagnetic induction (EMI) sensor technologies offer the ability to robustly distinguish between these two classes of objects. Early versions of these systems have tended to be large and designed for towed operation on open fields with good sky view to provide the necessary quality of geolocation information. The objective of ESTCP projects MR-200807 and MR-200909 was to demonstrate sensor arrays that are capable of reliably retaining the performance of one of these new technologies in a form suitable for use in rugged terrain and other environments where mobility and the viability of traditional positioning technologies are limited. The systems demonstrated in both projects are based on the transient electromagnetic (TEM) induction sensor technology that was developed under ESTCP project MR-200601.

关键词：传感器；电磁感应；地雷探测器；定位；未爆炸的弹药；SERDP收集；SERDP（战略环境研究发展计划）

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After the recent success in jamming wireless improvised explosive devices (IEDs), the threat nowadays has shifted towards the use of buried command wires. A capability to immediately detect the presence of a command wire would be of great value to the troops on the ground. The major challenge of a command wire sensor is to detect the wire in clutter and achieve a high probability of detection without large number of false alarms. The objective of this thesis is to investigate the wire scattering behavior and clutter characteristics through measurements performed in the NPS anechoic chamber. The research has successfully resolved the various multipath components within the anechoic chamber. The transmit-receive coupling between the antennas was reduced through the appropriate use of absorbers. Various wire scattering and clutter characteristics were established through the measurement results. In addition, the measurement results have also demonstrated close-in clutter rejection by utilizing time gating. Recommendations for future work were proposed to gather more data to support the ongoing NPS research on the Command Wire Sensor design.

关键词：传感器；简易爆炸装置；无线通信；发射机接收机；预警系统；命令线传感器

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This article shows a visual path for migrating to SoftLayer.

关键词：迁移；SoftLayer；专用VLAN；Windows Server VM；Racemi云路服务；视觉路径

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Microelectromechanical systems (MEMS) inertial sensors are commonly used in applications such as inertial navigation and human motion tracking. These inertial sensors provide three-dimensional (3D) orientation, acceleration, rate of turn, and magnetic field information. Manufacturers specify both static and dynamic accuracy for the 3D orientation output of MEMS inertial sensors. The dynamic accuracy is in the form of a root-mean-square (RMS) error and is only valid for certain motions, which are not specified. In this thesis, an investigation of the dynamic accuracy of the Xsens Motion Tracker (MTx) inertial sensor was conducted. The yaw or heading dynamic accuracy of the Microstrain 3DM-GX3-25 inertial sensor also was investigated. A pendulum test apparatus from a previous work was used to test the MTx and GX3. An encoder is installed to the pendulum axis of rotation and provides the reference data needed to calculate the dynamic accuracy of the MTx and GX3. After a series of motion tests, it was concluded that the MTx was within manufacturer specifications for static accuracy but not for dynamic accuracy. More specifically, the heading or yaw accuracy of the MTx and GX3 did not meet manufacturer specifications under the testing motions chosen in this study.

关键词：传感器；精度探测器；惯性导航；微机电系统

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This project supports the capability to perform accurate infrasound sensor calibrations using a piston source and large volume chamber whose output has been independently determined and for which the error budget has been accurately assessed. Since the mid 1980s, Los Alamos National Laboratory (LANL) has operated an infrasound sensor calibration chamber that operates over a frequency range of 0.02 to 4 Hz. This chamber has provided sensitivities, volts/Pa, for sensors used by Los Alamos and others. Under the current program we will restore the chamber function, interrupted by an unexpected move, collaborate with researchers at the Sandia National Laboratory (SNL) Facility for Acceptance, Calibration, and Testing (FACT) Site on sensor issues, calibrate sensors as needed and research new methods for sensor response determination.

关键词：传感器；次声；校准；探测器；活塞

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Sandia's scientific and engineering expertise in the fields of computational biology, high-performance prosthetic limbs, biodetection, and bioinformatics has been applied to specific problems at the forefront of cancer research. Molecular modeling was employed to design stable mutations of the enzyme L-asparaginase with improved selectivity for asparagine over other amino acids with the potential for improved cancer chemotherapy. New electrospun polymer composites with improved electrical conductivity and mechanical compliance have been demonstrated with the promise of direct interfacing between the peripheral nervous system and the control electronics of advanced prosthetics. The capture of rare circulating tumor cells has been demonstrated on a microfluidic chip produced with a versatile fabrication processes capable of integration with existing lab-on-a-chip and biosensor technology. And software tools have been developed to increase the calculation speed of clustered heat maps for the display of relationships in large arrays of protein data. All these projects were carried out in collaboration with researchers at the University of Texas M. D. Anderson Cancer Center in Houston, TX.

关键词：生物医药；电导率；酶；生物技术

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Flight systems operating new performance and stability limits require continuous, robust autonomy through real-time performance-based measurements.

关键词：传感器；飞机系统；操作性能

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While mobile phones have penetrated deep into tier 2 and 3 cities in India and similar emerging economies, adoption of mobile web content and web services is likely to require the creation of large numbers of relevant applications and services with usable interfaces and interaction paradigms. This paper describes PaperWeb, our effort to enable mobile phone users to use the web for day to day transactions such as paying bills, buying tickets, or fixing appointments, using familiar objects such as paper artifacts. The PaperWeb system addresses two aspects: (i) creation of useful PaperWeb interactions - without programming - by moderately tech-savvy users, and (ii) the use of these interactions by tech-naive users. We describe a user study that motivated PaperWeb, and the design of the PaperWeb system and its technology components. We conclude the paper with a discussion of what has been achieved to date and future directions.

关键词：Web任务；手机摄像头；文档图像处理

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This guide helps you get started with a typical installation for Microsoft? SharePoint? v2010 SP1 using a script package and defines the requirements of this automation in IBM? PureApplication? System.

关键词：PureApplication；IBM模式实验室；微软SharePoint v2010 SP1

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