Soft errors induced by ionizing particles constitute one of the most pressing problems of present semiconductor technology. hardening measures have been attempted empirically and through circuit simulation, design modification, and device simulation. a necessary component to these studies is an… More

This is an analytical study of the viscous three dimensional unsteady flow field over airfoil sections. the long term goal of the efort is development of an analysis that can be applied to predicting the flow field over airfoils in general and on helicopter rotors in particular. although a complete… More

This project formulates, tests and evaluates new techniques for improving the accuracy and efficiency of implicit finite-difference algorithms for the three dimensional compressible navier-stokes equations. the techniques should, if sucessful, reduce the errors due to added artificial dissipation… More

A proposal is presented herein to develop a numerical procedure for analyzing the ship numerical procedure for analyzing the ship propeller tip vortex problem. the flow in this region is very complex as it contains three-dimensional, viscous and centrifugal effects. the long terms goal of the… More

A proposal is presented herein to develop a design-oriented navier-stokes cascade computer code. development of such code which could be run successfully by a new code user would be a major benefit in the compressor or turbine designprocess. under the proposed effort, both a coordinate generation… More

There has been in the past, and will continue to be in the future, applications for high frequency three-terminal devices. the requirements for high frequency devices has led to the development over the past few years of a number of new device configurations. these include the permeable base… More

A proposal is presented herein to initiate an analytic study of the flow field resulting from the interaction of an unsteady shock wave with the ground and above ground structures. the long term goal of this analysis will be twofold, (1) predict the pressure pulse on structures and (2) predict the… More

In modern high performance gas turbines of interest to the air force it has been found beneficial to achieve high operating temperatures at the expense of requiring active cooling of many of the components. this cooling air is often drawn from the compressor and fed into the turbine along a path… More

A proposal is presented herein to numerically investigate the unsteady dynamics of hairpin vortics submerged in various background flows. the computer code to be used was developed for calculating unsteady three-dimensional turbulent boundary layer flows on wings and is capable of treating negative… More

A proposal is presented herein to extend a recently developed labryinth seal analysis to enable it to be applied to more advanced seals which have recently been proposed for use in advanced high performance axial turbomachinery. under phase i of this effort, the necessary initial coordinate system… More

An investigation is proposed herein to formalize, test and evaluate new techniques for improving the transient accuracyof implicit finite-difference algorithms for the two and three-dimensional compressible navier-stokes equations. theproposed investigation is motivated by the need for computational… More

Proper duct design is a fundamental engineering problem which can have a major impact upon compnent efficiency. current aerospace applications, which place a premium on compact design and closely fit components, often exacerbate this problem. examples are ducts associated with inlets andnozzles as… More

A proposal is presented herein to initiate a study of the transient behavior of a silicon charge coupled device (ccd) and its response to incident radiation. the motivation for this effort is based on recent analytical and hardware studies which have identified the potenially significant benefits… More

The blade tip vortex flow field has a significant impact on the aerodynamic performance and acoustic characteristics of aircraft propellers. this project involves computation of tip vortex generation process for advanced propellers using a forward maching procedure. the procedure would be used to… More

This project addresses a computer code capable of accurately simulating the internal fluid mechanics of liquid propellant rocket thrust chambers using a combined eulerian-lagrangian description. such a code will be extremely useful in conducting a parametric study of the effect of design parameters… More

This document discusses a proposed program for the two dimensional numerical simulation of a heterojunction algaas/gaas bipolar transistor with a wide-gap emitter. hbt's offer considerable reduction in switching speeds and improvements in cut-off frequencies over their homojunction counterparts and… More

The proposed effort would develop an analysis for three-dimensional compressor passage flow fields including tip leakage effects. the analysis would be based upon a high resolution, three-dimensional navier-stokes approach and would include the effects of blade and casing boundary layers, passage… More

Of all the devices proposed for high speed operation, the high electron mobility transistor (hemt) seems to be the most promising one. currently, there is a need to evaluate the device physics and operating characteristics of hemt devices. this proposal addressed this issue by focusing on two… More

Maximum speed of operation and high transconductance of transistors have been among the driving forces toward submicron microminiaturization within the past decade. advances toward these goals have resulted in an ever increasing spate of new devices, among them the hemt, modfet, transistor, the… More

Single event upsets (seus) induced by ionizing radiation constitute one of the most pressing problems of semiconductor technology. an understanding of the physical mechanisms associated with charge collection has already furthered the development of hardening procedures.this understanding has… More

The proposed effort would investigate the problem of a vortex interacting with a helicopter rotor blade section. this would represent the first step in applying the three-dimensional, navier-stokes equations to the transonic rotor blade/vortex interaction effects on helicopter performance and noise.… More

Dislocations in semi-insulating gallium arsenide (gaas) crystals are known to exert a considerable influence on the performance of electronic devices. the crystal quality in turn depends on the meltcrystal interface characteristics, e.g., temperature fluctuation during growth. for a long time it has… More

The proposed effort would develop an approach for the simulation of the external compression inlet flow field via the three-dimensional, time-dependent navier-stokes equations. with this innovative approach to the problem theentire flow field would be simulated via a single set of governing… More

Solution of fluid dynamics problems by numerical finite difference techniques currently produces cost effective design and analysis for the aerospace community for a variety of problems. for any given problem, the objective of the finite difference numerical simulation is an accuraterepresentation… More

An efficient procedure is proposed to solve the time-dependent, multidimensional navier-stokes equations about multiple body configurations which may be in motion relative to one another. for such applications, the geometric constraints of the component elements often require that patched grids be… More

Research and development of a major innovation in flow measurment, called hot-block anemometry, is proposed for measuring fluid velocity. measurement of velocity characteristics in complex and unsteady flows is a problem of great practical importance. hot-block anemometry is proposed to extend… More

The transferred electron device is an active device capable of operation as a dipole domain dominated gunn oscillator and as a circuit controlled 94 ghz gunn oscillator. there are several key ingredients for device operation. first, there is the requirement that the semiconductor material posses a… More

Single event upsets (seus) induced by ionizing radiation constitute one of the most pressing problems of semiconductor technology. an understanding of the physical mechanisms associated with charge collection has already furthered the development of hardening procedures. this understanding has… More

Acoustic resonance creates a problem with both the operation and the durability of current high performance gas turbine augmentors. future gas turbines are expected to have an even more severe environment for augmentor resonance. the current level of understanding of this problem gives no assurance… More

The proposed effort focuses upon the design and development of an ultra high frequency jet ventilator that could be used in conjunction with other procedures for the treatment of injuries sustained under both combat and noncombat conditions. the ultra high frequency jet ventilator is portable, i.e.… More

There is an overall need for velocity measurements in a wide range of applications that have complex geometry, such as in vstol aircraft ducts, heat exchangers, pumps, manifolds and rocket engines. a velocity measurement technique which uses laser-doppler anemometry and refractive-index-matching of… More

The proposed effort would develop a predictive technique forthe projectile base flow region including the effects of base injection and spin. the technique would be based upon a solution of the navier-stokes equations without the assumption of axial symmetry, and would be applicable from the… More

This document discusses a proposal to perform process modeling, via numerical simulation, of magnetron reactive ion etching (mie) process with applications to etching of gaas, algaas and other iii-iv compounds. the key issues are understanding of flow dynamics, effects of magnetic field on flow… More

One of the key issues facing electronic devices is determining their speed. theory predicts that nonequilibrium effects in devices should improve the speed of some devices by upwards of a factor of five. the difficulty lies in finding nonevasive experimental techniques that isolate this phenomena,… More

This document discusses a proposal to perform numerical simulations of two-dimensional quantum well devices. numerical simulations are to be performed through implementation of scientific research associates' algorithms to solve the quantum transport and poisson equations. both single and double… More

Recent technology advances have demonstrated the possibility of fabricating satisfactory electronic diamond films in reasonable quantities. as a consequence of this, older designs are being reworked and new device structures developed that take advantage of the semiconducting diamond. however, it… More

A proposal is presented herein to introduce a new perspective of machine intelligence for n-link general purpose manipulators. this innovative approach not only solves the inverse kinematic problem (ikp), but also provides a potential self-correction mechanism to perform the assigned task. the… More

Ducts are currently designed through series of calculations and tests, which are performed until a duct meeting certain design criteria is obtained. the proposed innovation would provide an easily utilized tool for design of a duct which is optimum for a specific application. use of many modern cfd… More

An innovative approach is proposed to integrating sophisticated computational fluid dynamics (cfd) procedures into the mixed flow compressor design system. under the phase i/phase ii effort scientific research associates in conjunction with teledyne cae would demonstrate the capability of the sra… More

Two innovative instruments for flight research, a steady-state spectrofluorimeter and a laser-induced-fluorescence thermometer, are proposed for nonintrusive measurements at mach numbers between 4 and 15 in the middle atmosphere. the spectrofluorimeter would provide information about ambient air… More

An innovative approach is proposed for the design of secondary gas path systems for gas turbine engines. the proposed phase i/phase ii program would be pursued by sra as a prime contractor with teledyne cae participating as a subcontractor. under this effort an existing code would be further… More

This document discusses a proposal to perform numerical simulations of electronic devices making use of the recently discovered high-t(c) superconducting oxides. numerical simulations are to be performed through implementation of scientific research associates inc.'s (sra) algorithms: starting with… More

An innovative approach is proposed for developing a sophisticated computational fluid dynamics (cfd) procedure for marine gas turbine exhaust diffusers and integrating this procedure into the gas turbine design process. under the combined phase i/phase ii effort, scientific research assocaites would… More

During the past decade there has been an increase in the design and complexity of compound semiconductor devices and systems. for these devices and systems to operate effectively, robust device and system designs are needed. unfortunately in the case of gallium arsenide devices, design engineers use… More

An innovative technique is proposed to improve the quality of electronic materials during a floating zone crystal growth process under microgravity conditions by applying an axial dc magnetic field to a floating zone. the applied magnetic field is to suppress the undesirable convection caused by… More

The effectiveness of kinetic energy space-based interceptor may be considerably enhanced by on-board uv sensors capable of detecting a potential target's uv signature. such uv sensors may play a critical role in target identification, tracking, seeking and discrimination and may prove instrumental… More

An innovative approach is proposed to the design problems of components for chemically reacting flows. under this proposal, a computer code would be developed for use in a workstation environment. all input/output would be performed on the workstation via interactive protocols and actual… More

An innovative approach is proposed in applying state-of-the-art numerical modelling to the important problem of dynamic lift analysis. under this approach an evaluation of possible algorithms would be made and that algorithm most advantageous to the difficult dynamic life simulation would be chosen… More

This proposal discusses a program for utilizing and expanding an innovative quantum based multi-particle self-consistent algorithm for solving the equation of motion of the density matrix to explore new device phenomena. the algorithm has been developed at sra and offers for the first time the… More

An innovative concept for a tunable imaging ir spectrometer is proposed. the device will consist of an acoustooptic tunable filter coupled to a two-dimensional focal plane array detector. this imaging spectrometer will combine high throughput (approaching 100%) with the tunability and high… More

An innovative approach is proposed to develop state-of-the-art vortex generators for suppression of boundary lyer separation on compressor blades operating under transonic, high load conditions. the combined phase i/phase ii program would be performed by scientific research associates in cooperation… More

An innovative, compact and fast directional laser sensor based on the latest achievements in photodetection technology is proposed. the laser sensing device uses a sphere lens as a direction identifier, with a wide (+or-90 deg) field of view. an incident laser beam is focused by the sphere lens onto… More

An innovative nanosecond, time-resolved fluorescence detection technology, with the potential for simultaneously measuring multiple analytes in a single sample, will be applied to the development of a novel quantitative, high-sensitivity immunofluorimetric assay system for reproductive hormones. the… More

Improvement in the internal cooling of turbine blades is important to continuation of the trend towards higher turbine inlet temperatures that can provide performance, size and durability advantages for current and future gas-turbine engines. knowledge of the detailed flow structure in internal… More

An innovative approach is proposed to develop an analysis for liquid flows with vapor bubbles, such as those which occur in bearings, seals, and pumps in liquid rocket engines. the approach is based on a combined eulerian-lagrangian analysis, in which the continuous (liquid) phase is treated by… More

Development of a time-resolved fluorescence microscopy system is proposed. the system would employ acoustooptic tunable filters as spectral tuning elements in lieu of the conventional interference filters, and a phase-modulated image dissector tube (or a nanosecond gated ccd) as a detector. the… More

Research is directed towards determining the feasibility of developing an educational software package, for use by undergraduate level engineering students, which would demonstrate and aid in teaching semiconductor device physics. the software would be used as an adjunct to classroom studies in a… More

The establishment of guiding design principles for the operation of quantum confined devices is necessary for making ultra-small devices and for producing more functionality per unit area of chip when the device size is unchanged. such guiding principles require a quantum mechanically based set of… More

This proposal discusses a program to design and develop low noise, high speed high electron mobility transistors (hemt). the material system will be inalas/ingaas on inp as this technology promises to be the vehicle for high speed integrated circuits. the objective of the program is to design the… More

An innovative approach is proposed to develop an inlet/fan compression system design methodology for those components for which the inlet and fan have a strong mutual interdependence and cannot be considered separately. the proposed phase i/phase ii effort would be performed with sra as the prime… More

Multiphase flow effects in liquid and solid propulsion systems have profound implications on performance and durability. for example, the dynamics of aluminum oxide particulates in an srm affects the slag accumulation, thereby affecting the performance, and the particulate impingement on the motor… More

This proposal describes a program for the design and fabrication of si-ge heterostructure bipolar transistors (hbt) for applications in communications. emphasis will be placed on low noise, high power and high frequency performance. the innovation here is the use of an advanced device physics… More

This proposal addresses a program to develop a noninvasive, in-situ sensor technique for application in semiconductor manufacturing. the proposed sensor is appropriate for dry plasma processes such as deposition and etching which are key steps in semiconductor fabrication line. the proposed… More

Plasma processing has become an important technique in semiconductor device fabrication. in order to improve process reproducibility and develop process and quality control, the gec reference cell has been chosen at nist as the experimental standard reactor which is designed to advance the next… More

This proposal decribes a program to develop a process model for the electron cyclotron technology (ecr). a compementary experimental program is also proposed. ecr is receiving much attention is plasma processng with applications to deposition and etching. it allows deposition of dielectric and other… More

VIRTUALLY ALL PRESENT DIGITAL ICs ARE BASED ON BINARY LOGIC. THE CONSTRAINTS IN TERMS OF INCREASED DENSITY CENTER AROUND ISSUES OF COMPLEXITY IN DESIGN, LOSS THROUGH ADDITIONAL INTERCONNECTS, POWER DISSIPATION, ETC. CONCOMITANT TO BINARY ICs HAS BEEN THE NOTION THAT THE INTRODUCTION OF LOGIC… More

An innovative imaging technique is proposed for surface/wafer temperature measurement in a chemical vapor deposition (CVD) reactor. Limitations in measuring absolute, as well as relative temperature in a CVD reactor, limit the ability to utilize intelligent processing of material, including feedback… More

A fast and high sensitivity time-resolved spectrofluorometer is being developed into a commercial product. in contrast with the classical fluorometric method, such as time-correlated single photon counting and phase modulation, the novel instrument is based on the introduction of two recently… More

The project is developing a noninvasive temperature sesnor for application in dry etching (plasma etching, reactive ion etching, for example) of electronic materials. there is a critical need for such sensors at present since the temperature of the wafer influences the results of the etching… More

A novel technique is proposed using a commercially available low-flux, isotopic source and multiple detectors for spectral transmission/scattering radiation data to obtain characteristic signatures of explosive materials. the amount and energy of scattering depends on the density, composition and… More

Stall management is a key component in compressor design and its successful implementation is one key item required in meeting IHPTET compressor performance goals. The work proposed herein would utilize in innovative design concept, in which blade treatment in the form of grooves in the tip region,… More

The progress in modern communications systems depends upon the availability of high-bnadwidth, high-reponsivity photo-detectors. Most electronic communications circuits are still silicon based due to the established fabridcation technology. However, GaAs photo-dtectors can offer bandwidth and… More

This document describes a program for numerically predicting the performance of hundereds of millimeter wave oscillators that are combined through quasi-optical techniques. The focus of this program will be on combining three terminal field effect transistors. The basis of the analysis centers… More

This document describes a program for the efficient and affordable deisgn of the next generation of ultra-fast devices and circuits. The core of the program involves demonstrating that Scientific Research Associates, Inc. (SRA) menu accessed multiple particle quantum DENsity MATrix (DENMAT)… More

Development of a three-dimensional p article trajectory analysis for inlet particle separators is proposed by combining a continuum flow Navier-Stokes analysis capable of simulating flow in an installed inlet with a three-dimensional Lagrangian based particle tracking analysis. Both components… More

This proposal describes a program to enhance the development of new nanoscale semiconductor devices. The Phase I program centers around porting the Nanoelectronic Engineering Modeling (NEMO) program undertaken at Texas Instruments, Inc. (TI) to desktop PCs, with the Microsoft Windows NT operating… More

This proposal describes the development of a PC Windows-based CAD tool for examining nanostructure device concepts. While CAD tools are available for micron scaled devices, a CAD tool for nanostructure devices operating on conventional desktop PCs with a Microsoft Windows operating system and a… More