We have discovered systems of molecules with the architecture of miniaturized triblock copolymers that self assemble into nanostructures highly regular in size and shape. In the system described here, a mushroom-shaped supramolecular structure of about 200 kilodaltons forms by crystallization of the chemically identical blocks in the system. Interestingly, the supramolecular units self organize into films containing one hundred or more layers stacked in polar arrangement. The polar...
Topics: DTIC Archive, Stupp, Samuel I., ILLINOIS UNIV AT URBANA DEPT OF MATERIALS SCIENCE AND ENGINEERING,...
Autonomous estimation of the altitude of an Unmanned Aerial Vehicle (UAV) is extremely important when dealing with flight maneuvers like landing, steady flight, etc. Vision based techniques for solving this problem have been underutilized. In this thesis, we propose a new algorithm to estimate the altitude of a UAV from top-down aerial images taken from a single on-board camera. We use a semi-supervised machine learning approach to solve the problem. The basic idea of our technique is to learn...
Topics: DTIC Archive, MINNESOTA UNIV DULUTH, *HELICOPTERS, *AERIAL PHOTOGRAPHY, OPTIMIZATION, THESES,...
A rotary inchworm-motor using piezoelectric actuators was developed. The motor design has the advantage of a macro and micro stepper motor with high torque and speed. The design is capable of fast angular positioning with micro level accuracy. The rotary motor, as designed, can also be used as a clutch/brake mechanism. Experimental results demonstrating the prototype's performance based on the aforementioned design considerations are presented. Also proposed herein is a novel way to improve the...
Topics: DTIC Archive, Garcia, Ephrahim, VANDERBILT UNIV NASHVILLE TN DEPT OF MECHANICAL AND MATERIALS...
We present a miniature snapshot multispectral imager that operates in the short wavelength infrared (SWIR) region and has a number of applications. The system is low weight and portable with a miniature platform, and requires low power. The imager uses a 4-deg Fabry-Perot filter array operating from 1487 to 1769 nm with a spectral bandpass 10 nm. The design of the filters is based on using a microelectromechanical system (MEMS) shadow mask technique to fabricate a Fabry-Perot etalon with...
Topics: DTIC Archive, ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE, *IMAGES,...
This report results from a contract tasking TSNIIMASH - EXPORT, JSC as follows: The goal of proposed SOW is to demonstrate current status and performances of low power (0.1...1 kW) Thrusters with Anode Layer ( TAL) with using Xenon propellant, provide an analysis of critical issues associated with low power TAL development and potential level of low power TAL characteristics, propose draft of the program for breadboard low power thruster development.
Topics: DTIC Archive, Semenkin, Alexander V, CENTRAL RESEARCH INST FOR MACHINE BUILDING MOSCOW (RUSSIA),...
We have been working since the 1980s, for the past 5 yrs under DOD support, on novel ways to resuscitate unresuscitable trauma victims. We focus on combat casualties who exsanguinate internally resulting within a few min in cardiac arrest (CA). We have conceived and documented the concept of suspended animation (SA) for delayed resuscitation using a hypothermic saline flush into the aorta after rapid (over 5 min) exsanguination (Ex) CA, using novel clinically relevant outcome models in dogs....
Topics: DTIC Archive, Kochanek, Patrick M, PITTSBURGH UNIV PA, *SYMPOSIA, *WOUNDS AND INJURIES,...
The dissertation discusses a completely new concept for the realization of specific inductance construction forms, with which, in parallel construction, one might work on a multitude of coils integrated into processing usage. Firstly, the author sets out his principles for production and characterization; secondly, he describes the usage process in detail, so as to provide examples for his empirical research. The next and largest chapter focuses on the deformation of the microstructures,...
Topics: DTIC Archive, Wiest, Florian, UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY) FAKULTAET...
Antennas currently used for VHF and UHF band operation (30-512MHz) are bulky and often inefficient. Antenna miniaturization techniques can be employed to reduce their size and improve performance. The two most common approaches are the use of dielectric material or reactive (inductive and capacitive) loading to create a slow wave structure by reducing the effective wavelength in the antenna structure. In this report the concept of miniaturizing a broadband spiral antenna using dielectric...
Topics: DTIC Archive, Kramer, B, OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB, *MINIATURIZATION, *CONFORMAL...
A proof of concept Monolithic Microwave Integrated Circuit (MMIC) Water Vapor Radiometer (WVR) is under development at the Jet Propulsion Laboratory (JPL). WVR's are used to remotely sense water vapor and cloud liquid water in the atmosphere and are valuable for meteorological applications as well as for determination of signal path delays due to water vapor in the atmosphere. The high cost and large size of existing WVR instruments motivate the development of miniature MMIC WVR's, which have...
Topics: NASA Technical Reports Server (NTRS), FABRICATION, FEASIBILITY ANALYSIS, INTEGRATED CIRCUITS,...
This paper presents an advanced miniature heat transport system for thermal control of small spacecraft. The thermal system consists of a loop heat pipe (LHP) with multiple evaporators and multiple deployable radiators for heat transfer, and variable emittance coatings on the radiators for performance enhancement. Thermoelectric coolers are used to control the loop operating temperature. The thermal system combines the functions of variable conductance heat pipes, thermal switches, thermal...
Topics: NASA Technical Reports Server (NTRS), EVAPORATORS, TEMPERATURE CONTROL, MINIATURIZATION, HEAT...
The Mars Pathfinder mission (formerly Mars Environmental Survey or MESUR) is scheduled for launch in December 1996 and is designed to place a small lander on the surface of Mars. After impact, the lander unfolds to expose its solar panels and release a miniature rover. Also on board is the Imager for Mars Pathfinder (IMP) binocular camera which is elevated by a deployable mast to obtain a panoramic view of the landing area. The design of this deployable mast is based on similar designs which...
Topics: NASA Technical Reports Server (NTRS), BEAMS (SUPPORTS), CAMERAS, ENVIRONMENT SIMULATION,...
In recent years, some remote-sensing applications require advanced airborne multi-sensor systems to provide high performance reflective and emissive spectral imaging measurement rapidly over large areas. The key or unique problem of characteristics is associated with a black box back-end system that operates a suite of cutting-edge imaging sensors to collect simultaneously the high throughput reflective and emissive spectral imaging data with precision georeference. This back-end system needs...
Topics: NASA Technical Reports Server (NTRS), MINIATURIZATION, IMAGING TECHNIQUES, IMAGE PROCESSING,...
Topics include: Relative-Motion Sensors and Actuators for Two Optical Tables; Improved Position Sensor for Feedback Control of Levitation; Compact Tactile Sensors for Robot Fingers; Improved Ion-Channel Biosensors; Suspended-Patch Antenna With Inverted, EM-Coupled Feed; System Would Predictively Preempt Traffic Lights for Emergency Vehicles; Optical Position Encoders for High or Low Temperatures; Inter-Valence-Subband/Conduction-Band-Transport IR Detectors; Additional Drive Circuitry for...
Topics: NASA Technical Reports Server (NTRS), ACTUATORS, COMBUSTION CHAMBERS, ELECTRON SPIN, END EFFECTORS,...
Future surface missions to Mars and other planetary bodies will benefit from continued advances in miniature sensor and sample handling technologies that enable high-performance chemical analyses of natural samples. Fine-scale (approx.1 mm and below) analyses of rock surfaces and interiors, such as exposed on a drill core, will permit (1) the detection of habitability markers including complex organics in association with their original depositional environment, and (2) the characterization of...
Topics: NASA Technical Reports Server (NTRS), PLANETARY SURFACES, MASS SPECTROMETERS, CHEMICAL ANALYSIS,...
The UK has conducted a number of studies into the requirements for Surveillance of Space and the associated analysis and dissemination issues which emerge that are needed to produce a Recognised Space Picture. The UK also has existing niche capability in a number of areas related to Surveillance of Space and potential in a number of other areas that could be harnessed for this purpose. For example, use of ground-based optical sensors, phased array radar technology, radar data processing for...
Topics: DTIC Archive, DEFENCE SCIENCE AND TECHNOLOGY LAB PORTSDOWN WEST (UNITED KINGDOM), *OPTICAL...
A miniature thermoacoustic refrigerator is being developed for the purpose of cooling integrated circuits below their failure temperature when used in hot environments. The development of an electrically powered acoustic driver that powers the thermoacoustic refrigerator is described. The driver utilizes a flexural tri-laminar piezoelectric disk to generate one to two Watts of acoustic power at 4 kHz in 15 bar of He-Kr gas mixture. This thesis is the second of two driver development theses,...
Topics: DTIC Archive, Direk, Seyhmus, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *INTEGRATED CIRCUITS,...
Magneto-dielectric materials offer a new design space for radio frequency (RF) passive components such as antennas, circulators, feed networks, radomes, etc. Polymer nanocomposites offer a means to tailor electric and magnetic properties as well as define necessary mechanical and thermal properties. Recent advances in nanocomposite synthesis methods offer the potential for dramatically different electric and magnetic properties as compared to conventional materials. This research project...
Topics: DTIC Archive, Kempel, Leo, MICHIGAN STATE UNIV EAST LANSING, *POLYMERS, *DIELECTRICS,...
A new method of controlling a flapping-wing micro air vehicle by varying the velocity profiles of the wing strokes is presented in this manuscript. An exhaustive theoretical analysis along with simulation results show that this new method, called split-cycle constantperiod frequency modulation, is capable of providing independent control over vertical and horizontal body forces as well as rolling and yawing moments using only two physical actuators, whose oscillatory motion is defined by four...
Topics: DTIC Archive, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIR/CONTROL SCIENCES...
This work involves the study of instabilities and transition to turbulence in boundary layers on cones at different angles of attacks at high supersonic and hypersonic Mach numbers. It utilizes facilities at NASA Langley Research Center which make use of quiet design nozzles to minimize the level of acoustic disturbances. The experiments include design Mach numbers of 3.5, and 8.0, and involve two models. The first is a 70 half-angle circular cross-section cone which has been previously used by...
Topics: DTIC Archive, Corke, Thomas C, NOTRE DAME UNIV IN DEPT OF AEROSPACE AND MECHANICAL ENGINEERING,...
High resolution, 4-D environmental characterizations of the physical and bio-optical structure of the near shore and coastal oceans are needed in order significantly improve our understanding of the complex biogeochemical processes acting these regions. Accurate assessments of the vertical structure of the physical, optical, and biogeochemical properties in the coastal environment are also vital to many naval operations (i.e. MCM, ASW). Furthermore, the development of a national backbone of...
Topics: DTIC Archive, WESTERN ENVIRONMENTAL TECHNOLOGY LAB INC (WET LABS INC) PHILOMATH OR, *TELEMETER...
A miniature ramjet engine designed to perform at Mach 4.0 was tested in a supersonic wind tunnel. Cryogenic strain gauges were used to measure drag and Schlieren imaging techniques were used to observe the inlet Mach cone profile at Mach numbers of 4.0. Three different nozzle configurations were tested to confirm computational models used to predict back pressure and normal shock locations at the inlet. Using ANSYS-CFX, a cold flow, computational fluid dynamics model of the ramjet in the wind...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTATIONAL FLUID DYNAMICS, *RAMJET...
Advancing technologies and equipment give smaller Group I type unmanned aerial system aircraft such as the RQ-11 Raven B, Wasp, and other miniature sized vehicles the capability for a single Marine to carry and employ a Group I UAS to provide over the hill intelligence and surveillance for a prolonged period of time at the tactical level. Because the Wasp and Raven B both have the capability to locate targets and provide a 1 O-digit grid, a forward observer or fire support team can utilize the...
Topics: DTIC Archive, MARINE CORPS COMMAND AND STAFF COLL QUANTICO VA, *MILITARY INTELLIGENCE, *REMOTELY...
In research funded by the ONR Young Investigator Award, our group was the first to investigate electrochemical reactions at solid electrodes of nanoscopic dimensions. The results have implications in redox chemistry of colloids and supported catalysts and in chemical analyses using miniaturized electrodes. Initial work using ultra thin platinum band electrodes demonstrated a departure of mass-transfer-limited voltammetric currents from predictions based on continuum fluid structure. We proposed...
Topics: DTIC Archive, MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMICAL ENGINEERING AND MATERIALS SCIENCE,...
With the DURIP Grant Number FA9550-09-1-0448 we purchased a Nanonics MV-4000 Near Field Scanning Optical Microscope (NSOM) and a Fianium SC450-6 Super Continuum laser. Conventional far-field microscopy is limited by the diffraction such that all optical information about features smaller than one-half the wavelength is lost between the sample being investigated and the eye of the observer. This can be likened to the difficulties inherent in trying to understand the layout of an electronic...
Topics: DTIC Archive, PENNSYLVANIA UNIV PHILADELPHIA, *CIRCUITS, *METAMATERIALS, *NANOTECHNOLOGY, *NEAR...
This report summarizes the progress made during Phase 2B of an effort to develop a tactical rubidium frequency standard (TRFS) for the U.S. Air Force SEEK TALK program. The overall objective is to achieve a production capability for an extremely small, rugged and fast warmup atomic clock for avionics applications. This phase of the program accomplished the redesign of the previous bench version into a prototype configuration. Projected prototype size is 2.5 x 2.5 x 4.0 inches. (Author)
Topics: DTIC Archive, Riley,William J, EG AND G INC SALEM MA ELECTRONIC COMPONENTS DIV, *RUBIDIUM,...
Rubidium (Rb) gas cell frequency standards display a wide range of performance characteristics. At one extreme are relatively large and heavy standards developed for high performance applications such as Global Positioning System (GPS) satellites. At the other extreme are miniature commercial units with sizes and weights less than 10% of the satellite clocks. Military and commercial satellites have growing needs for accurate frequency and time information. A new generation of miniature Rb...
Topics: DTIC Archive, Frueholz, Robert P., AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS,...
We are developing a highly miniaturized trapped ion clock to probe the 12.6 GHz hyperfine transition in the (sup 171)Yb+ ion. The clock development is being funded by the Integrated Micro Primary Atomic Clock Technology (IMPACT) program from DARPA, where the stated goals are to develop a clock that consumes 50 mW of power, has a size of 5 cubic cm, and has a long-term frequency stability of 10(exp -14) at 1 month. Trapped ion systems are an excellent candidate for such extreme miniaturization,...
Topics: DTIC Archive, SANDIA NATIONAL LABS ALBUQUERQUE NM, *NANOSECOND TIME, *MICROELECTRONICS, *IONS,...
Various mass analyzer systems were evaluated. Several systems show promise, including the Stanford Research Systems RGA-100, Inficon XPR-2, the University of Florida's Ion Trap, and the Compact Double Focus Mass Spectrometer. Areas that need improvement are the response time, recovery time, system volume, and system weight. Future work will investigate techniques to improve systems and will evaluate engineering challenges.
Topics: NASA Technical Reports Server (NTRS), MASS SPECTROMETERS, EVALUATION, ACCURACY, TECHNOLOGY...
This paper summarizes ongoing work concerning micro-rotorcraft (MRC)--i.e., rotary-wing micro air vehicles (MAV)-- research and development. Technology trends involving microelectronic miniaturization, vehicle autonomy systems, electric propulsion and power electronics are contributing to an ongoing revolution in MAV and MRC aerial vehicle concepts and applications. New vehicle configurations are being developed, as well as old concepts being reassessed, for MAV and MRC vehicles.
Topics: DTIC Archive, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA ROTORCRAFT DIVISION,...
This paper presents a heuristic fuzzy position estimation technique for autonomous underwater vehicle navigation. The heuristic estimator performs asynchronous data fusion of all sensor measurements based on their relative confidence levels, and then nonlinearly combines the fused information with the INS estimates via fuzzy filtering techniques. In this paper, the basis and implementation of the estimator will be described, and navigation results will be presented based on the heuristic...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL ENGINEERING, *AUTONOMOUS...
Advances in condition-based maintenance (CBM) are being driven by an array of technologies, including: speed and miniaturization of signal processing hardware; improvements in power supplies and sources; and smaller, lower-cost RF transmitters. As the set of industries and organizations that are developing and integrating these technologies into CBM components and systems move forward, they should insure that a balance is achieved between technology-push and customer-pull. The existing and...
Topics: DTIC Archive, Watt, Lewis, RLW INC STATE COLLEGE PA, *MANAGEMENT PLANNING AND CONTROL, SIGNAL...
This report is the research summary of flying MAV experiments in turbulent flow, utilizing prior research measuring and reproducing aspects of the outdoor environment. Turbulence was replicated in a large wind engineering tunnel and was well mixed, thus replicating atmospheric turbulence under neutrally stable conditions far removed from local effects. Current studies are focused on using increasingly small fixed-wing and flapping-wing aircraft with IMU video tracking, and upstream flow...
Topics: DTIC Archive, ROYAL MELBOURNE INST OF TECH (AUSTRALIA), *DRONES, *ATMOSPHERIC MOTION, *TURBULENT...
Using a 3-D axis-symmetric model, the cold-flow performance of a miniature ramjet in Mach 4 flow was predicted with the computational fluids dynamic (CFD) code from ANSYS-CFX. The nozzle-throat area was varied to increase the backpressure and this pushed the normal shock that was sitting within the inlet, out to the lip of the inlet cowl. Using the eddy dissipation combustion model in ANSYS-CFX, a combustion analysis was performed on the miniature ramjet. The analysis involved the single-step,...
Topics: DTIC Archive, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *FLUID DYNAMICS, *RAMJET ENGINES, *SUPERSONIC...
Advances in technology and signal processing techniques have opened the door to using an UWB random noise waveform for radar imaging. This unique, low probability of intercept waveform has piqued the interest of the U.S. DoD as well as law enforcement and intelligence agencies alike. While AFIT's noise radar has made significant progress, the current architecture needs to be redesigned to meet the space constraints and power limitations of an aerial platform. This research effort is AFIT's...
Topics: DTIC Archive, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND...
A miniaturized laser Doppler velocimeter is formed in a housing that is preferably 3 mm in diameter or less. A laser couples light to a first diffractive optical element that is formed on the fiber end. The light is coupled to a lens that also includes a diffractive optical element. The same lens is also used to collect receive light, and receives includes another diffractive optical element to collect that received light.
Topics: NASA Technical Reports Server (NTRS), LASER DOPPLER VELOCIMETERS, MINIATURIZATION, PATENTS, Gharib,...
A class of miniature probes has been proposed to supplant the fiber-optic probes used heretofore in some Raman and fluorescence spectroscopic systems. A probe according to the proposal would include a capillary tube coated with metal on its inside to make it reflective. A microlens would be hermetically sealed onto one end of the tube. A spectroscopic probe head would contain a single such probe, which would both deliver laser light to a sample and collect Raman or fluorescent light emitted by...
Topics: NASA Technical Reports Server (NTRS), CAPILLARY TUBES, METALLIZING, RAMAN SPECTROSCOPY,...
Sensor systems are under development for use in real-time detection and quantitation of microbes in water without need for sampling. These systems include arrays of optical sensors; miniature, portable electronic data-acquisition circuits; and optoelectronic interfaces between the sensor arrays and data-acquisition circuits. These systems are intended for original use in long-term, inline monitoring of waterborne micro-organisms in water-reclamation systems aboard future spacecraft. They could...
Topics: NASA Technical Reports Server (NTRS), BIOLOGICAL EFFECTS, OPTICAL MEASURING INSTRUMENTS,...
The pace of change has increased at NASA. OBPR s focus is now on the Human interface as it relates to the new Exploration vision. The fundamental physics community must demonstrate how we can contribute. Many opportunities exist for physicists to participate in addressing NASA's cross-disciplinary exploration challenges: a) Physicists can contribute to elucidating basic operating principles for complex biological systems; b) Physics technologies can contribute to developing miniature sensors...
Topics: NASA Technical Reports Server (NTRS), MANNED SPACE FLIGHT, MARS MISSIONS, NASA PROGRAMS, COMPLEX...
AERCam is a nano-satellite class free-flying spacecraft with a full suite of avionics, propulsion, navigation, and communications. 1) 3 major development programs, one ending in DTO of protoflight unit, other two ending in ground demonstrations with integrated hardware and software. 2) Incremental increase in capability to reduce crew workload, provide better inspection capability. 3) Two crew evaluations and 4) Significant technology advancement.
Topics: NASA Technical Reports Server (NTRS), CAMERAS, MINIATURIZATION, NANOSATELLITES, AVIONICS, ROBOTICS,...
NASA Glenn Research Center (GRC) is applying its expertise and facilities in harsh environment instrumentation to develop a Compact Full-Field Ion Detector System (CFIDS). The CFIDS is designed to be an extremely compact, low cost instrument, capable of being flown on a wide variety of deep space platforms, to provide comprehensive (composition, velocity, and direction) in situ measurements of heavy ions in space plasma environments with higher fidelity, than previously available.
Topics: NASA Technical Reports Server (NTRS), LOW EARTH ORBITS, DEEP SPACE, RADIATION DETECTORS,...
The Observatoire Cantonal de Neuchatel (ON) is developing for ESTEC a compact H-maser for space use based upon a miniature sapphire loaded microwave cavity, a technique pioneered at VNIIFTRI. Various contacts between West-European parties, headed by ESA, and the Russian parties, headed by ESA, led to the proposal for flying two H-masers on Meteor 3M, a Russian meteorology satellite in low polar orbit. The experiment will include two masers, one provided by ON and the other by VNIIFTRI. T/F...
Topics: NASA Technical Reports Server (NTRS), CAVITY RESONATORS, CLOCKS, HYDROGEN MASERS, MICROWAVE...
The development of a new soil temperature probe for use in geotechnical studies is described. The field evaluation of prototype probes in the summers of 1975, 1976 and 1977 is also outlined. It has been found that the new lightweight probe is much more durable than previous models. It is also shown that the probe rapidly reaches equilibrium with ambient field temperature which facilitates the acquisition of temperature data in the active soil layer. (Author)
Topics: DTIC Archive, Pichette,Denis R, DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO), *PROBES, *SOILS,...
The use of DNA testing as an important component of breast cancer diagnosis has been increasing rapidly during the l99Os. The goal of this research Is to develop, optimize, and test a miniaturized sensing system for the rapid and relIable genetic screening detection of breast-cancer. In accordance to our original goal our studies have focused on various fundamental and practical aspects of electrical detection of DNA segments specific to the breast-cancer gene BRCAl. We have made a substantial...
Topics: DTIC Archive, Wang, Joseph, NEW MEXICO STATE UNIV LAS CRUCES, *ELECTROCHEMISTRY, *BREAST CANCER,...
A new generation of smart air launched miniature munitions/stores including such stores as the Small Diameter Bomb (SDB) is in the early stages of development by the services. The initial versions of these stores will range primarily from 100 to 350 pounds, with variants for attack of fixed, re-locatable, and mobile targets. The primary carriage mode for existing aircraft will be via advanced captive dispensers with internal electronics, which provide for interfacing and carriage of multiple...
Topics: DTIC Archive, Provenza, Jerry, AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE, *MILITARY...
This report summarizes the prototyping work of a concept micro pump for chemical concentration. The work conducted under this project is a six-month concept study. The application target of the research is to help improve the sensitivity of the chemical agent sensor developed at the Army Research Laboratory in Aberdeen, Maryland. The main objective of the work is to study the feasibility of a micro pumping that can be fabricated by the surface machining technology. A prototype of the pump is...
Topics: DTIC Archive, Sun, Jian-Qiao, DELAWARE UNIV NEWARK DEPT OF MECHANICAL ENGINEERING, *WATER,...
Recent advances in miniaturization and low-cost, low-power design have led to active research in large-scale networks of small, wireless, low-power sensors and actuators. Time synchronization is a critical piece of infrastructure in any distributed system, but wireless sensor networks make particularly extensive use of synchronized time. Almost any form of sensor data fusion or coordinated actuation requires synchronized physical time for reasoning about events in the physical world. However,...
Topics: DTIC Archive, Elson, Jeremy E, CALIFORNIA UNIV LOS ANGELES, *COMMUNICATIONS NETWORKS,...
The long term goal is to transition existing prototype autonomous profiling nutrient analyzers into commercial products that can be readily deployed on autonomous profiling moorings, coastal gliders and propeller driven unmanned underwater vehicles and used for sustained, autonomous ocean observations of chemical distributions and variability. A series of issues have been identified that need to be addressed to convert prototype nutrient analyzers into commercial units that can be widely used...
Topics: DTIC Archive, Hanson, Alfred K, SUBCHEM SYSTEMS INC JAMESTOWN RI, *OPTICAL DETECTORS, *NUTRIENT...
The miniaturization of optoelectronic devices is essential for the continued success of photonic technologies. Nanowires have been identified as potential building blocks that mimic conventional photonic components such as interconnects, waveguides, and optical cavities at the nanoscale. Semiconductor nanowires with high optical gain offer promising solutions for lasers with small footprints and low power consumption. Although much effort has been directed toward controlling their size, shape,...
Topics: DTIC Archive, CALIFORNIA UNIV BERKELEY, *LASERS, *NANOWIRES, CROSS SECTIONS, DIGITAL...
A production engineering measure for subminia ture, transistor-type potentiometers. Progress made in the various steps of assembly is out lined for the 2400 controls being fabricated for the reliability study and the 1800 controls for preproduction testing against Specification SCS 112. To-date, more than 1000 flat-mount and bushing-mount controls have been fabricated.
Topics: DTIC Archive, Kinsey, D C, CTS CORP ELKHART IN, *POTENTIOMETERS, PRODUCTION ENGINEERING, TEST...
Three-dimensional mapping has many applications including robot navigation, medical diagnosis and industrial inspection. However, many applications remain unfilled due to the large size and complex nature of typical 3-D mapping systems. The use of fiber optics allows the miniaturization and simplification of many optical systems. This research used a fiber optic coupler to project a fringe pattern onto an object to be profiled. The two outputs fibers of the coupler were brought close together...
Topics: DTIC Archive, Pennington, Timothy L, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG, *FIBER...
