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Briefs Materials
Cluster-Assembled Soft Magnets for Power Electronics Applications
This technique uses nanocluster assembly to produce model soft magnetic materials with simpler chemical composition than existing materials and well-controlled nanostructure, and...
Briefs Photonics/Optics
Evaluation of Performance of WL Fe-Based Spin-LEDs
A study was performed to evaluate the performance of a recently developed type of Fe-based spin-light-emitting diodes (spin-LEDs) that incorporate wetting layers (WLs). [The term "wetting...
Briefs Photonics/Optics
Advances Toward Affordable High-Energy Laser Modules
A multidisciplinary research project entitled “Affordable High-Energy Lasers” has made numerous contributions to the development of several types of advanced laser modules, including not...
Briefs Photonics/Optics
Lasing Consequences of Silicon Nanostructures
While silicon electronics has been a success in modem technologies, silicon photonics is still in development and in need of a laser source. Many approaches have been explored, from anodized silicon luminescence, to generating direct emissions by quantum-confinement, and to indirect down-conversion of a...
Briefs Materials
Fluidic Flexible Matrix Composites for Autonomous Structural Tailoring
In previous research, a high-mechanical- advantage actuator system inspired by the fibrillar networks in plant cell walls was developed. One of the basic elements in the...
Briefs Medical
Macromolecular Carriers for Nanomedicine and Nano Devices
Tailoring the surface properties of biodegradable nanospheres and microspheres for in-vivo blood-contacting applications includes defining relationships among chemical composition, processing parameters, nanosphere sizes and size distributions, and surface structure. Developments include: 1)...
Briefs Medical
Genetic Studies of Responses of Bones to Mechanical Stresses
Progress has been reported in a continuing program of molecular genetic studies of the responses of bones to mechanical stresses. Prior studies in mice and humans had provided evidence that mechanical loading stimulates bone formation and that immobilization or loss of mechanical...
Briefs Mechanical & Fluid Systems
Characterization of a MEMS Directional Sound Sensor
There is a wide range of potential military applications in which ambiguity in bearing occurs with respect to sound. For example, autonomous unmanned aerial vehicles (UAVs) could employ a...
Briefs Physical Sciences
Two-Camera Imaging System for Kinematic Measurements
A high-speed imaging system has been devised as a noninvasive means of collecting data on the kinematics of working models of developmental underwater or aerial vehicles that would utilize...
Briefs Information Technology
Infrastructure for Development of Secure, Reliable Software
The Verification and Automated Reasoning research group at Cornell University has been building an infrastructure, comprising human expertise and computational resources, for the development of secure, reliable software for critical military applications. Such software includes distributed...
Briefs Information Technology
A Formal Model of the Attack Surface of a Software System
A formal model has been devised to impart some mathematical rigor to the concept of the attack surface of a software system. Complementing the model is a definition of a quantitative...
Articles Defense
Applying Reconfigurable Computing to Acoustic Sensors
There is growing interest in the U.S. Armed Forces in the development of microsensor systems that are easily deployed and that support reconnaissance, surveillance, and target acquisition...
Articles Sensors/Data Acquisition
Digital Light Control Simplifies Focal Plane Array Testing and Image Sensor Production
Characterization of the performance of image sensors and image sensor systems is critical to success in many defense and security applications. From image...
Briefs Photonics/Optics
Photon Counting Chirped Amplitude Modulation Ladar
This work is a follow-up to prior efforts to develop a method using Geiger-mode avalanche photodiode (GM-APD) photon counting detectors in chirped amplitude modulation (AM) ladar receivers to...
Briefs Photonics/Optics
Reduced Power Laser Designation Systems
This work contributes to the Micropulse Laser Designation (MPLD) project to develop a six-pound eye-safe micro-pulse laser system to locate, identify, range, mark, and designate stationary and moving targets. MPLD uses laser pulses of much lower energy and higher repetition rates than in existing laser...
Briefs Mechanical & Fluid Systems
Stability of Rotors Supported by Hydrodynamic Film Bearings
The document, "Hydrodynamic Fluid Film Bearings and Their Effect on the Stability of Rotating Machinery" represents a lecture in a series "Design and Analysis of High-Speed Pumps," held in 2006 under the auspices of the North Atlantic Treaty Organization. The document introduces the basic...
Briefs Mechanical & Fluid Systems
Prototype Rocket Engine for a Nanosat Launch Vehicle
A paper discusses a prototype rocket engine for a suborbital Reusable Nanosat Launch Vehicle (RNLV). The engine must operate with thrust levels from 3,000 to 5,000 lbf. The engine is comprised of three major subassemblies: the injector, igniter, and the combustion chamber nozzle. Propellants are...
Briefs Physical Sciences
Advanced Concepts for Space Access
A paper summarizes commonly proposed advanced launch concepts, including both concepts that employ propellant and propellant-less concepts. A wide range of advanced launch concepts have been proposed in an effort to revolutionize space access through either a significant reduction in launch costs or significant...
Briefs Information Technology
Explicitly Timed Authorization Logic
A document describes explicitly timed authorization logic (nicknamed "η-logic"). In prior authorization logics, it is, variously, impossible or difficult to handle time explicitly; express security policies that involve complex, time-dependent relationships; or reason accurately about time. By enabling...
Briefs Electronics & Computers
Emerging Power and Energy Technologies for Portable Electronics
A report discusses data obtained for the Navy's Special Operations Command (SOCOM), which seeks a portable power/energy source capable of providing sufficient power and energy for complex missions at a minimal weight penalty. The report focuses on the specific energy of systems,...
Briefs Physical Sciences
Nanostructured Ferromagnetic-Wire/Insulator Composites
A research and development effort now in progress is focused on nano-structured ferromagnetic- wire/insulator composite materials to be used as the magnetic-core materials of sensors for...
Briefs Materials
Barium Ferrite Materials for Microwave Circulators
Barium ferrite thick disks have been fabricated for incorporation in self-biased microwave devices. The process uses barium ferrite nanopowder mixed with epoxy. The mix is placed on alumina substrates to fabricate 500 μm thick disks of BaM to achieve good magnetic properties such as magnetic...
Briefs Materials
Lubrication Considerations for Military Equipment
Military equipment is subject to increasingly harsh environmental conditions and performance requirements. Simultaneously, engineers and equipment operators are demanding longer service life and less maintenance. The proper approach to lubrication is critical to minimizing equipment failures and...
Briefs Materials
Thermal Characterization of Thin Films for MEMS Applications
Dielectric thin films play a very important role in the development of microelectromechanical systems (MEMS). These dielectric materials often are used as insulating layers in...
Briefs Electronics & Computers
Optical Microwave-Signal-Channelization Technique Analyzed
In a recent study, a proposed technique for optical frequency-band channelization of a microwave signal or other wide-band radio signal in a receiver was analyzed and compared with...
Briefs Electronics & Computers
High-Cycle Life Testing of RF MEMS Switches
The electromechanical, RF, and charging properties of an "air-gap" capacitive switch enable it to be utilized in high-cycle life testing. Monitoring both high-speed and low-speed switching...
Briefs Photonics/Optics
Continuous-Wave Laser Diodes Based on a Novel InGaAsNSb Material System
Laser sources operating in the spectral region from 2 to 3.5 μm are in demand for ultra-sensitive laser spectroscopy, medical diagnostics, home security, industrial process monitoring, infrared countermeasures, and optical wireless communications. Currently, solid-state...
Briefs Mechanical & Fluid Systems
SparkJet Actuators for Controlling Flows
SparkJet actuators are under investigation as means of controlling flows — especially supersonic and hypersonic flows. In one important class of potential applications, SparkJet actuators would be...
Briefs Manufacturing & Prototyping
Improvements in Manufacturing BMI/Fiber Composites Using AFP
A program now in progress is dedicated to making improvements in automated fiber placement (AFP) for the manufacture of advanced composite-material (matrix/fiber) structural...
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