Stories
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Briefs: Materials
Experiments have shown that superlattices that comprise alternating epitaxial layers of dissimilar paraelectric perovskites can exhibit large changes in permittivity with the application of...
Briefs: Electronics & Computers
A relatively inexpensive instrumentation system that includes units that are connected to thermocouples and that are parts of a radio-communication network has been developed to enable monitoring of...
Briefs: Electronics & Computers
Very-large-scale integrated (VLSI) analog binaural signal-processing circuits have been proposed for use in detecting and locating leaks that emit noise in the ultrasonic frequency...
Briefs: Electronics & Computers
The cascade back-propagation (CBP) algorithm is the basis of a conceptual design for accelerating learning in artificial neural networks. The neural networks would be implemented as analog...
Briefs: Electronics & Computers
A number of display systems primarily used in specialized areas such as aviation, space (NASA), and military/defense employ non-standard video signal...
Briefs: Mechanical & Fluid Systems
The multidisciplinary concept of "bioinspired engineering of exploration systems" (BEES) is described, which is a guiding principle of the continuing effort to develop biomorphic explorers as...
Briefs: Manufacturing & Prototyping
An improved method of fabrication of cathodes of microbatteries is based on electrophoretic deposition. Heretofore, sputtering (for deposition) and the use of photoresist and liftoff...
Briefs: Manufacturing & Prototyping
An improved design for multiple-well microscope cells and an associated improved method of fabricating them have been devised. [As used here, "well" denotes a cavity that has a...
Briefs: Software
Manufacturing companies must bring high-quality products to market faster than ever before. This tightened timeframe significantly impacts the manufacturing supply chain — a familiar...
Briefs: Manufacturing & Prototyping
Wheel Design Verified With FEA Software
This paper examines an aluminum wheel design used with a run-flat tire called an extended mobility technology (EMT) tire, which can be safely driven without air for at least 80 km (50 miles). The setup of the finite element model of the wheel is discussed in detail, along with a parametric study of the...
Briefs: Mechanical & Fluid Systems
A piezoelectrically actuated shutter is undergoing development for use in experiments on laser cooling of atoms. The shutter is required to be compatible with ultrahigh vacuum [pressure of 10-9...
Briefs: Mechanical & Fluid Systems
In March of 1999, five pilots performed flight tests to evaluate the handling qualities of an F/A-18 research airplane equipped with a small-displacement center stick (ministick)...
Briefs: Photonics/Optics
Curved mirrors of a proposed type would comprise lightweight sheets or films containing integral, biologically inspired actuators for controlling their surface figures. These mirrors could...
Briefs: Photonics/Optics
Deformable mirrors of a proposed type would be equipped with relatively-large-stroke microscopic piezoelectric actuators that would be used to maintain their reflective surfaces in precise shapes....
Briefs: Photonics/Optics
A class of lightweight, deployable, thin-shell, curved mirrors with built-in precise-shape-control actuators is being developed for high-resolution scientific imaging. This technology incorporates a...
Briefs: Photonics/Optics
Planar two-dimensional arrays of thermopiles intended for use as thermal-imaging detectors are to be fabricated by a process that includes surface micromachining. These thermopile arrays are...
Articles: Photonics/Optics
Many imaging applications in the near-infrared (NIR) region of the spectrum require sensors that see beyond the traditional charge-coupled device (CCD) sensor’s spectral range. A standard uncoated CCD detector...
Briefs: Mechanical & Fluid Systems
The torque-limited touchdown bearing system (TLTBS) is a backup mechanical- bearing system for a high-speed rotary machine in which the rotor shaft is supported by magnetic bearings in...
Briefs: Motion Control
An improved method and prior methods of deadbeat direct torque control involve the use of pulse-width modulation (PWM) of applied voltages. The prior methods are based on the use of stator...
Briefs: Information Technology
Collaborative Software Development Approach Used To Deliver the New Shuttle Telemetry Ground Station
United Space Alliance (USA) developed and used a new software development method to meet technical, schedule, and budget challenges faced...
Briefs: Physical Sciences
Turbulence in Supercritical O₂/H₂ and C₇H₁₆/N₂ Mixing Layers
This report presents a study of numerical simulations of mixing layers developing between opposing flows of paired fluids under supercritical conditions, the purpose of the study being to elucidate chemical-species- specific aspects of turbulence. The simulations were...
Briefs: Physical Sciences
An improved design has been proposed for a cryostat of a type that maintains a desired low temperature mainly through boiloff of a liquid cryogen (e.g., liquid nitrogen) at atmospheric...
Briefs: Materials
Over the last 40 years, a series of misconceptions regarding mica capacitor applications has led novice users to consistently over- derate wound or...
Briefs: Electronics & Computers
Suitably patterned arrays (blocks) of quantum-dot cellular automata (QCA) have been proposed as fault-tolerant universal logic gates. These block QCA gates could be used to realize the potential of QCA for...
Briefs: Electronics & Computers
A data-processor architecture that would incorporate elements of both conventional very-large-scale integrated (VLSI) circuitry and quantum- dot cellular automata (QCA) has been proposed to enable...
Briefs: Photonics/Optics
Custom Software for Infrared Camera Image Acquisition and Control
Infrared cameras based on hybrid focal-plane array sensors are unlike consumer video products such as camcorders. They are complicated imaging devices that output very large amounts of digital image data at high speeds, require multiple levels of camera control, and produce imagery...
Briefs: Photonics/Optics
Brushlike arrays of carbon nanotubes embedded in microstrip waveguides provide highly efficient (high-Q) mechanical resonators that will enable ultra-miniature radio-frequency (RF)...
Briefs: Photonics/Optics
Optical-Quality Thin Polymer Membranes
A method of fabricating both curved and flat thin polymer membranes of optical quality has been developed. The method was originally intended to enable the fabrication of lightweight membrane imaging and interferometric optics, possibly with apertures multiple meters wide, for use in scientific instruments...
Briefs: Photonics/Optics
Electromechanical resonators of a proposed type would comprise single carbon nanotubes suspended between electrodes (see Figure 1). Depending on the nanotube length, diameter, and...
Top Stories
Blog: Sensors/Data Acquisition
Going for Gold in Winter Olympic Curling
Blog: Energy
Batteries that Can Withstand the Cold
Blog: Lighting
A Stretchable OLED that Can Maintain Most of Its Luminescence
INSIDER: Design
Advancing All-Solid-State Batteries
Blog: Data Acquisition
Blog: Materials
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