| Modeling Transient Thermal Behavior in a Thrust Vector Control Jet Vane |
DEC 88 |
48 pages |
| Authors:
Margaret M. Reno; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | An attempt was made to model the transient thermal response of jet vanes used for thrust control. A simple computer model based on lumped capacitance methods using boundary layer convection and stagnation point heating as thermal inputs appeared to adequately predict temperatures for a quarter- scale model. This report details the attempt to enlarge the model to allow comparison between thermal predictions and the results of tests on a full-scale ... |
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| Criteria for Robust Stability in a Class of Lateral Inhibition Networks Coupled Through Resistive Grids |
NOV 88 |
22 pages |
| Authors:
John L. Wyatt Jr.; David L. Standley; MASSACHUSETTS INST OF TECH CAMBRIDGE MICROSYSTEMS RESEARCH CENTER
|
| In the analog VLSI implementation of neural systems, it is sometimes convenient to build later inhibition networks by using a locally connected on- chip resistive grid to interconnect active elements. A serious problem of unwanted spontaneous oscillation often arises with these circuits and renders them unusable in practice. This paper reports on criteria that guarantee these and certain other systems will be stable, even though the values of designed elements ... |
|
| Stability Criterion for Lateral Inhibition and Related Networks That is Robust in the Presence of Integrated Circuit Parasitics |
NOV 88 |
31 pages |
| Authors:
David L. Standley; John L. Wyatt Jr; MASSACHUSETTS INST OF TECH CAMBRIDGE MICROSYSTEMS RESEARCH CENTER
|
| In the analog VLSI implementation of neural systems, it is sometimes convenient to build lateral inhibition networks by using a locally connected on- chip resistive grid. A serious problem of unwanted spontaneous oscillation often arises with these circuits and renders them unusable in practice. This paper reports a design approach that guarantees such a system will be stable, even though the values of designed elements in the resistive grid may ... |
|
| Continued Development and Characterization of Doped Layers, Contacts and Associated Electronic Devices in Silicon Carbide |
31 OCT 88 |
31 pages |
| Authors:
R. F. Davis; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The primary thrust of research of this period has been to deposit and characterize the contact materials of TaSi2 and A1 on n- and p-type material, respectively. Auger electron spectroscopy detected some oxygen throughout the thickness of these films. Current voltage characteristics were non-linear and highly resistive due to oxygen contamination in the films. A new ultra-high vacuum deposition chamber is being constructed to deposit pure contacts. Rectifying contacts of ... |
|
| Investigation of the Interface between Two Immiscible Electrolytes Applied to Membrane Electrochemistry |
13 OCT 88 |
10 pages |
| Authors:
Petr Vanysek; NORTHERN ILLINOIS UNIV DE KALB DEPT OF CHEMISTRY
|
| Four experimental studies were performed in the previous period: Effect of protein adsorption on capacitance of water/nitrobenzene interface, Potentiometric study of fluorescent oxacyanine cation partitioning, frozen interfaces and microinterfaces. The most valuable experimental technique in use is impedance spectroscopy in the frequency range from 1 Hz to 65 kHz. Currently a new nonlinear least square software for data evaluation is being utilized. In the study of oxacyanine dyes, both experimental ... |
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| In-Line Determination of Presence of Liquid Phase Moisture in Sealed IC Packages. |
04 OCT 1988 |
|
| Authors:
Nagappan K. Annamalai; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
 | Liquid phase moisture is detected in sealed integrated circuit packages by measuring the conductance and capacitance of the integrated circuit at a temperature which is above temperatures which allow moisture to condense; and remeasuring the conductance and capacitance of the integrated circuit at a temperature which allow any moisture present to condense on the integrated circuit. The conductance of the integrated circuit is expected to rise sharply with the condensation ... |
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| Circuit Design Criteria for Stability in a Class of Lateral Inhibition Neural Networks |
OCT 88 |
8 pages |
| Authors:
D. Standley; J. L. Whatt Jr; MASSACHUSETTS INST OF TECH CAMBRIDGE MICROSYSTEMS RESEARCH CENTER
|
| In the analog VLSI implementation of neural systems, it is sometimes convenient to build lateral inhibition networks by using a locally connected on- chip resistive grid. A serious problem of unwanted spontaneous oscillation often arises with these circuits and renders them unusable in practice. This paper reports a design approach that guarantees such a system will be stable, even though the values of designed elements in the resistive grid may ... |
|
| Modified Poisson-Boltzmann Equation in the Electric Double Layer Theory for an Electrolyte with Size Asymmetric Ions |
26 SEP 88 |
9 pages |
| Authors:
L. B. Bhuiyan; C. W. Outhwaite; PUERTO RICO UNIV RIO PIEDRAS
|
| A study was made of the structural features and thermodynamic aspects of a primitive model electric double layer, that is, a system of charged hard spheres of arbitrary diameters embedded in a dielectric continuum, next to a uniformly charged planar interface. Keywords: Modified poisson boltzmann, Electric double layer, Primitive model; Asymmetric ion size, Integral capacitance; Differential capacitance; Asymmetric ion thermodynamics; Asymmetric ion structure. (jhd) |
|
| Investigation of Radiation Effects on Semiconductor Devices and Integrated Circuits |
16 SEP 88 |
160 pages |
| Authors:
Zef Shanfield; Joseph R. Srour; Melvin Moriwaki; Kerry S. Kitazaki; Robert A. Hartmann; NORTHROP RESEARCH AND TECHNOLOGY CENTER PALOS VERDES PENINSULA CA
|
| Results of a study of radiation effects on electronic materials, devices, and integrated circuits are presented in this report. Emphasis was placed on determining the underlying mechanisms responsible for observed radiation effects with a view toward gaining understanding of value in the development of radiation-hardened devices. Measurements and analyses were performed of the effects of single energetic neutrons and protons on silicon integrated circuits. In addition, a detailed description is ... |
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| Fundamental Studies and Device Development in Beta Silicon Carbide |
31 AUG 88 |
|
| Authors:
Robert F. Davis; NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| The primary thrust of research of this period has been to deposit and characterize the contact materials of TaSi2 and Al on n- and p-type material, respectively. Auger electron spectroscopy detected some oxygen throughout the thickness of these films. Current voltage characteristics were non-linear and highly resistive due to oxygen contamination in the films. A new ultra-high vacuum deposition chamber is being constructed to deposit pure contacts. Rectifying contacts of ... |
|
| Analysis of Domain Decomposition Preconditioners on L-Shaped and C- Shaped Regions |
AUG 88 |
23 pages |
| Authors:
Tony F. Chan; Diana C. Resasco; YALE UNIV NEW HAVEN CT DEPT OF COMPUTER SCIENCE
|
| This document presents an algebraic analysis of some domain decomposition preconditioners on irregular regions. The authors analyze a preconditioner proposed in another work for the interface system and prove that, for all L-shaped regions and some C-shaped regions, it produces a convergence rate that is independent of the size of the discretization and the relative shape of the subdomains (aspect ratios). Specifically, it is proven that the condition number of ... |
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| The Behavior of Microdisk and Microring Electrodes. Chronopotentiometry and Linear Sweep Amperometry at a Microdisk Electrode |
15 JUL 88 |
33 pages |
| Authors:
L. M. Abrantes; M. Fleischmann; L. J. Li; M. Hawkins; J. W. Pons; UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY
|
| Chronopotentiometry has not been a widely used electroanalytical technique due to the severe distortion of the predicted shape of the response due to capacitative charging of the electrode. While the magnitude of the total current applied to the electrode can be controlled, the fraction of the total current driving the faradaic reaction is time dependent. As the electrode potential changes as the logarithm of the ratio of the surface activities ... |
|
| Characterization of Bovine Brain ATPase |
JUL 88 |
60 pages |
| Authors:
James J. Valdes; James P. Chambers; TEXAS UNIV AT SAN ANTONIO
|
| The purified bovine brain ATPase has been shown to be a high- affinity, low capacity pump, and consists of two proteins. A labile, high affinity dihydropyridine receptor activity has been associated with this ATPase activity. This study has shown that the purified (Ca2+ + Mg2+)-dependent ATPase can be immobilized, and that changes can be detected on the surface as increases in phosphate released and/or capacitance differences after interaction of the ... |
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| Electrical Field Dependence of Protein Conformation and Channel Function in Lipid Membranes of Different Compositions |
14 JUN 88 |
|
| Authors:
Israel R. Miller; WEIZMANN INST OF SCIENCE REHOVOT (ISRAEL) DEPT OF MEMBRANE RESEARCH
|
| The objective is to study the effect of electricla fields on the conformation of membrane proteins on their lateral distribution and on their function as channels or as receptors. The research has been conducted in three experimental systems, namely lipid monolayers, lipid bilayers (planar or in ulilamellar vesicles) and in whole biological membranes. The key problem in the current research was the vehavior of membrane component under the influence of ... |
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| Pseudomorphic Interfaces |
09 JUN 88 |
40 pages |
| Authors:
M. R. Melloch; R. L. Gunshor; L. A. Kolodziejski; J. A. Cooper Jr.; R. F. Pierret; PURDUE UNIV LAFAYETTE IN SCHOOL OF ELECTRICAL ENGINEERING
|
| The objectives of this work were to develop the epitaxial growth of ZnSe on epitaxially grown GaAs, fully characterize this interface electrically, and fabricate a depletion mode field effect transistor which incorporates this interface in the device structure. The electrical quality of our ZnSe/GaAs interfaces was investigated with capacitance versus voltage (CV) and current versus voltage (IV) measurements. The CV characteristics of annealed Au/ZnSe/p- GaAs capacitors were nearly ideal, exhibiting ... |
|
| Control Electronics for Atomic Force Microscopy |
JUN 88 |
11 pages |
| Authors:
O. Marti; S. Gould; P. K. Hansma; CALIFORNIA UNIV SANTA BARBARA DEPT OF PHYSICS
|
| We describe the control electronics for our Atomic Force Microscope (AFM). The set of electronic devices described here allow convenient operation of an Atomic Force Microscope. The key device is the Force Controller, which automates the otherwise tedious and time consuming readjustment of the force to a preset value by controlling two gated feedback loops. The preset value of the force can be easily changed by simply turning a potentiometer. ... |
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| Circuit Design Criteria for Stable Lateral Inhibition Neural Networks |
MAR 88 |
|
| Authors:
J. L. Wyatt Jr; D. L. Standley; MASSACHUSETTS INST OF TECH CAMBRIDGE MICROSYSTEMS RESEARCH CENTER
|
| In the analog VLSI implementation of neural systems, it is sometimes convenient to build lateral inhibition networks by using a locally connected on- chip resistive grid. A serious problem of unwanted spontaneous oscillation often arises with these circuits and renders them unusable in practice. This paper reports a design approach that guarantees such a system will be stable, even though the values of designed elements in the resistive grid may ... |
|
| Multiconcentric Coaxial Cable Pulse Forming Device. |
23 FEB 1988 |
|
| Authors:
James P. O'Loughlin; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A multiconcentric coaxial cable uses three or more concentric cables to supply power to a high voltage laser with reduced waveform degradation otherwise produced by stray capacitance and inductance. Each pair of concentric conductors is in itself a coaxial line and the radius of each conductor is selected such that the characteristic impedances of the two lines it forms with the adjacent conductors are equal. Each line is charged with ... |
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| Time Domain Wave Propagation in Multilayered Integrated Circuits |
FEB 88 |
|
| Authors:
Jin-Au Kong; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| Many integrated circuits contain strip lines at different heights that run parallel or perpendicular to each other. And we have investigated reliable models for these structures. First the capacitances associated with two offset parallel strips at different heights between ground planes are computed using the conformal mapping approach. As an extension, a simplified circuit of parallel-plate lines with transverse ridges is introduced to model two parallel strips with perpendicularly crossing ... |
|
| Self-Generated Converter Filter. |
26 JAN 1988 |
|
| Authors:
Charles S. Kerfoot; Walter E. Milberger; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| The reduction of non-monotonic degradation characteristics induced in the output signals in high-power applications of a transformer which has a primary winding and n secondary windings which have a total of N turns, where n and N are integers, is accomplished by replacing the n secondary windings with m replacement windings, where m is an integer less than n. When the replacement windings have a total of N turns, they ... |
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| A Method for the Design of Stable Lateral Inhibition Networks That is Robust in the Presence of Circuit Parasitics |
JAN 88 |
|
| Authors:
J. L. Wyatt Jr.; D. L. Standley; MASSACHUSETTS INST OF TECH CAMBRIDGE MICROSYSTEMS RESEARCH CENTER
|
| In the analog VLSI implementation of neural systems, it is sometimes convenient to build lateral inhibition networks by using a locally connected on- chip resistive grid. A serious problem of unwanted spontaneous oscillation often arises with these circuits and renders them unusable in practice. This paper reports a design approach that guarantees such a system will be stable, even though the values of designed elements and parasitics elements in the ... |
|
| Synthesis and Analysis of a Bilinear Grounded Inductor |
88 |
55 pages |
| Authors:
Robert M. Flynn; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| MOS technology and switched-capacitor design techniques have made it feasible to fully integrate active filters. The direct replacement of elements in passive RLC ladder structures with their bilinear equivalents is one method of realizing filters which retain the low sensitivity properties of passive RLC ladder filters. In this thesis a bilinear grounded inductor, which requires only one operational amplifier (op-amp) in its construction, is synthesized from a leap-frog parallel LC ... |
|
| Research Investigation Directed Toward Extending the Useful Range of the Electromagnetic Spectrum |
31 DEC 87 |
|
| Authors:
George W. Flynn; Richard M. Osgood Jr; COLUMBIA RADIATION LAB NEW YORK
|
| The usual semiclassical theory of light detection has been demonstrated to be valid only in the absence of feedback from detector to source. A revised theory has been developed that is valid even in the presence of such feedback. Research has begun on the possibility of using various heterostructures (including quantum-well devices) that might serve as solid- state versions of the space-charge-limited Franck-Hertz experiment (this experiment produced the first source ... |
|
| Defects in High-Mobility Semiconductor Systems |
23 DEC 87 |
|
| Authors:
Hermann Grimmeiss; LUND UNIV (SWEDEN) DEPT OF SOLID STATE PHYSICS
|
| Work under subject contract was continued in the period 23 Oct thru 23 Dec 1987 on (a) extensive electrical examination of the Pb center on silicon surfaces; (b) preliminary electrical investigation of the new metastable gallium arsenide (GaAs) defect which competes with the EL-2 center; (c) initial EPR measurements on a high ceramic superconductor; (d) related conceptual studies and tests. (a) The photocapacitance system described in the First Interim Report ... |
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| Calculating Depletion Region Carrier Concentrations with Capacitance- Voltage Measurements and Etching |
DEC 87 |
|
| Authors:
Gordon H. Gainer Jr; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Methods were developed for finding the charge carrier concentrations within the initial depletion region of n-type semiconductors. These methods combine the capacitance-voltage (C-V) technique with the etching of layers from the semiconductor surface. After each etch, the depletion region is made to end at the same location within the semiconductor. This location is used as a common reference and is arbitrarily chosen at a distance deep below the original unetched ... |
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| In-Situ Vibrational Spectroscopy of Specifically Adsorbed Azide on Silver Electrodes |
NOV 87 |
|
| Authors:
M. G. Samant; R. Viswanathan; H. Seki; P. S. Bagus; C. J. Nelin; IBM RESEARCH DIV SAN JOSE CALIF
|
| In-situ infrared vibrational spectra of azide ions specifically adsorbed on polycrystalline silver electrodes immersed in aqueous electrolytes of composition 1 to 30 mM azide and 0.1M perchlorate are reported for the potential range (I)0.25 to 0V versus Ag/AgCl (3M KC1). Adsorbed azide was not detected spectroscopically between 0V and -0.9V, a range (II) known from differential capacitance measurements to allow adsorption onto the silver electrodes. These experimental observations have been ... |
|
| Pierce Diode with External Circuit. III. Chaotic Behavior |
28 OCT 87 |
|
| Authors:
William S. Lawson; CALIFORNIA UNIV BERKELEY COLL OF ENGINEERING
|
| The existence of the strange attractor discovered by Godfrey in the neighborhood of alpha=3pi for the Pierce Diode is verified, and his numerical results are refined. The evolution of this attractor is then followed as an external capacitance is introduced. The Pierce diode is perhaps the simplest realistic theoretical model for a bounded one-dimensional plasma system. It is comprised of two parallel electrodes with electrons injected at one of the ... |
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| Preparation and Development of Advanced Battery Catalysts |
01 OCT 87 |
|
| Authors:
W. P. Kilroy; K. M. Abraham; M. Alamgir; EIC LABS INC NORWOOD MA
|
| New catalysts which improve the discharge performance of Li/SOCl2 cells have been identified. These catalysts were obtained by thermal treatment of acetylene black carbon doped with the precursors, Co(NO3)2, manganese phthalocyanine (MnPc) or vanadium phthalocyanine oxide (VOPc). The latter two materials appear to be superior to many catalysts presently available for use in Li/SOCl2 cells. Compared with uncatalyzed cells, MnPc-containing cells showed a 60% increase in cell capacity and a ... |
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| A Simulation Analysis of Errors in the Measurement of Standard Electrochemical Rate Constants from Phase-Selective Impedance Data |
30 SEP 87 |
|
| Authors:
D. F. Milner; M. J. Weaver; PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
|
| A digital simulation analysis is presented of the coupled effects of solution resistance and lock in amplifier damping upon the evaluation of standard rate constants for rapid electrode reactions using phase-selective AC impedance measurements with positive-feedback iR compensation. These two effects combine so to yield apparent (i.e. measured) rate constants, evaluated using the conventional frequency-dependent analysis that are generally smaller than the actual values. The extent to which these systematic ... |
|
| Electrosorptive Detection of Simple Organic Compounds in Liquid Chromatography |
30 SEP 87 |
|
| Authors:
T. Ramstad; M. J. Weaver; PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
|
| The detection of a range of neutral organic compounds in liquid chromatography based on decreases in differential double-layer capacitance, delta C(d), at a mercury-aqueous interface caused by analyte specific adsorption is described. The arrangement employs ac phase-selective measurements using a large-volume wall-jet configuration. The low-molecular-weight organic solutes examined include aliphatic alcohols, diols, mono- and dicarboxylic acids, amines, and alkanolamines. The differential capacitance measurements were conducted close to the potential of ... |
|
| Electrosorptive Detection Based on Double-Layer Capacitance for Selective Anion Monitoring in Ion Chromatography. 1. Mercury Electrodes |
25 SEP 87 |
|
| Authors:
Tore Ramstad; Michael J. Weaver; PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
|
| A novel scheme is presented for the detection of selected anions in ion chromatography based on changes in differential double-layer capacitance, Delta C sub d, for a metal electrode at a suitable electrode potential induced by specific anion adsorption. The detector in the liquid chromatography-double- layer capacitance (LC-DLC) arrangement described here is a hanging or dropping mercury electrode in a large-volume wall-jet configuration. The aqueous-phase anions observed to readily be ... |
|
| The Influence of Uncompensated Solution Resistance on the Determination and Standard Electrochemical Rate Constants Using Cyclic Voltammetry, and Some Comparisons with AC Voltammetry |
25 SEP 87 |
|
| Authors:
David F. Milner; Michael J. Weaver; PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
|
| A digital simulation analysis is presented of the deleterious effects of uncompensated solution resistance, Rus, upon the evaluation of standard rate constants, k2ob, using cyclic voltammetry. The results are expressed in terms of systematic deviations of 'apparent measured' rate constants, k2ob(app), evaluated in the conventional manner without regard for Rus, from the corresponding actual values, k2ob (true), as a function of Rus and other experimental parameters. Attention is focused on ... |
|
| Biodetector of Organophosphorous and Other Nerve Agents |
SEP 87 |
|
| Authors:
Mohyee E. Eldefrawi; James J. Valdes; MARYLAND UNIV BALTIMORE SCHOOL OF MEDICINE
|
| The nicotinic ACh receptor obtained from the electric organ of Torpedo was used successfully to detect OP nerve agents but had low sensitivity for cyanide and sulfur mustard. Use of ACh receptor-regulated binding of the allosteric probe was more efficient than monitoring changes in fluorescent receptor complexes. The most effective and practical strategy for developing a biodetector of nerve agents was to pursue receptor-based capacitance biosensors. The receptor embedded in ... |
|
| Response Characteristics of Dual MOSFET Gamma-Ray Sensors Produced by Mitel Corporation |
SEP 87 |
|
| Authors:
S. McGowan; R. A. Gravelle; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| Radiation-sensitivity measurements were carried out on two batches of dual MOSFET gamma-radiation sensors produced by Mitel Corp and packaged using different procedures by two other commercial firms. Significant differences were observed between the two production batches and also as a result of the difference in packaging. Those from the first Mitel batch packaged by Siltronics Limited were found to be most consistent and should be acceptable as sensor for the ... |
|
| Low Phase Noise Two Port Voltage Controlled Oscillator. |
04 AUG 1987 |
|
| Authors:
Grant H. Watkins; Lester K. Staley; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A low noise two port voltage controlled oscillator having a coarse tuning circuit serially connected to an inductor to form a resonant circuit. A fine tuning circuit is serially connected between the resonant circuit and the input to the amplifier. A large capacitance series silicon varactor minimizes noise at the frequency of operation while optimizing the coarse tuning range. |
|
| Improper Ferroelectricity: A Theoretical and Experimental Study |
31 JUL 87 |
|
| Authors:
J. R. Hardy; F. G. Ullman; NEBRASKA UNIV LINCOLN
|
| The theoretical and experimental investigations proposed for this period have been completed. First-principle theoretical lattice-dynamics calculations on the high and low-temperature commensurate phases of Rb2ZnC14, K2ZnC14, and BaMnF4 have indicated the origin of the incommensurate behavior in the intermediate phase. Molecular dynamics (M-D) calculations were developed that demonstrate how the orientational disorder develops in the molecular anion sublattice and how it relates to the incommensurate and commensurate phase transitions. These ... |
|
| Dielectric Spectroscopy of Semiconductors |
15 JUL 87 |
|
| Authors:
Andrew K. Jonscher; Mark N. Robinson; ROYAL HOLLOWAY AND BEDFORD NEW COLL EGHAM (UNITED KINGDOM)
|
| Dielectric studies are reported on two Schottky barriers on n-type silicon of 10 and 3,000 ohm cm room temperature resistivity, and also on an p-n junction on 1,000 ohm cm p-type silicon. The response of all three in the frequency range 0.01 - 10,000 Hz shows the presence of a loss peak which is slightly broader than Debye, and also a dc process, with further complicating features in the case ... |
|
| Impedance and Admittance Measurements at Intercalated n-HfS2/Non-Aqueous Electrolyte Interface |
JUL 87 |
|
| Authors:
Krystyna W. Semkow; Nirupama U. Pujare; Anthony F. Sammells; ELTRON RESEARCH INC AURORA IL
|
| Capacitance, impedance and admittance studies were performed on single crystal n-HfS2 before an after copper intercalation from acetonitrile based electrolyte. The n-HfS2/non-aqueous electrolyte interface was modelled by equivalent R-C circuits containing frequency dependent elements. Electrochemical intercalation by copper into n-HfS2 introduced Faradaic conductance effects. The composition of copper intercalated n-HfS2 in close proximity to the interfacial region was obtained assuming a diffusion coefficient for copper in n-HfS2 of 10 to ... |
|
| Investigations at the n-HfS2/Non-Aqueous Electrolyte Interfacial Region |
JUL 87 |
|
| Authors:
Krystyna W. Semkow; Nirupama U. Pujare; Anthony F. Sammells; ELTRON RESEARCH INC AURORA IL
|
| Single crystal n-Hafnium disulfide photoelectrodes prepared by halogen vapor transport were investigated in 0.1M TBAPF 6/Acetonitrile electrolyte using both impedance and admittance spectroscopy techniques. The presence of frequency dependent capacitive and resistive elements in the equivalent circuit for n-Hfs2/electrolyte interface were evident. Measured capacitance effects at the interfacial region were found dependent upon the crystal orientation used, with that for defect free van der Waals surfaces being 10 to the ... |
|
| Metal Intercalation Characteristics of n-HfS2 Photoelectrodes in Nonaqueous Electrolytes |
JUL 87 |
|
| Authors:
Krystyna W. Semkow; Nirupama U. Pujare; Anthony F. Sammells; ELTRON RESEARCH INC AURORA IL
|
| The photoelectrochemical (PEC) performance of single crystal n- Hafniumdisulfide was correlated with capacitance and impedance measurements obtained with the photoanode van der Waals layers oriented either parallel or perpendicular to acetonitrile-based non-aqueous electrolytes, with and without Copper Chloride introduced as an intercalating redox species. For van der Waals layers perpendicular to the electrolyte (i.e., available for copper intercalation) space charge capacitance values of respectively .01 and 1 micro Farad/sq. cm ... |
|
| Time Domain Electromagnetic Waves in Multilayered Media |
JUN 87 |
|
| Authors:
Jin-Au Kong; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| This work has (1) modeled and calculated the impedance parameters of strip lines with perpendicularly crossing strips and computed the transient response on such structures, (2) analyzed the effects of periodical meshed ground planes on signal propagation, (3) generalized the method of characteristics for signal propagation on nonuniformly coupled transmission lines, (4) studied the transient response of arbitrary source excitation on two- layer media, and (5) studied the models of ... |
|
| Macromodeling CMOS Circuits for Timing Simulation |
JUN 1987 |
96 pages |
| Authors:
Lynne M. Brocco; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| A macromodeling and timing simulation technique is presented that allows fast, accurate delay calculations for CMOS circuits. This method is well suited for delay calculations of regular structure VLSI circuits, as well as circuits designed from standard cell libraries. Timing models for both logic gate and transmission gate circuit forms are developed. For logic gates, output transition time and delay time are functions of input transition time and load impedance. ... |
|
| Numerical Simulation of the Permeable Base Transistor |
04 MAY 87 |
|
| Authors:
M. Meyyanppan; J. P. Kreskovsky; B. Morrison; H. L. Grubin; SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT
|
| This document describes the results of an SBIR Phase II program to investigate, through numerical simulation, the operational physics of the gallium arsenide permeable base transistor. Two distinct algorithms were used in the study: the semiconductor drift and diffusion equation algorithm and the moments of the Boltzmann transport equation algorithm. The results of the study show that one-micron feature size PBTs are capable of: a) cutoff frequencies in excess of ... |
|
| Effect of Physical and Geometric Factors on the Impedance of Electrochemical Power Sources |
01 MAY 87 |
|
| Authors:
B. D. Cahan; M. L. Daroux; E. B. Yeager; CASE WESTERN RESERVE UNIV CLEVELAND OHIO DEPT OF PHYSICS
|
| Short-time transient behavior in the charge/discharge of small electrochemical power sources does not scale up for large systems. calculations are presented which show that a number of commonly neglected physical and geometric factors, such as the skin effect and the distributed network impedance characteristics of the individual cells and cell assemblies, can severely limit performance. The impedance of individual cells has been calculated over a wide range of frequencies 100-10th ... |
|
| Measurement of Spice Parameters for Bipolar Junction Transistors |
30 APR 87 |
|
| Authors:
Willard E. Bartlett Jr; ARMY MILITARY PERSONNEL CENTER ALEXANDRIA VA
|
| In order for the circuit simulation program SPICE2 to accurately portray an actual transistor circuit, the program must be able to accurately represent the operating characteristics of the transistor. This can be done when the program user specifies transistor parameters that vary from one transistor to another. This investigation develops techniques for determining SPICE2 parameters for a bipolar junction transistor (BJT) using measurement data obtained primarily through the use of ... |
|
| Proceedings of the Annual Gravity Gradiometry Conference (15th) Held in Colorado Springs, Colorado on February 11 - 13, 1987. Volume 1 |
13 FEB 87 |
264 pages |
| Authors:
Vishnu V. Nevrekar; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| This conference included the following topics: GRADIO Project: A SGG Mission Based on Microaccelerometers, A Mercury Manometer Gravity Gradiometer, Bell Aerospace Gravity Gradiometer Survey System (GGSS) - Program Review, A prototype Superconducting Gravity Gradiometer for Geophysical Exploration, Gravity Gradiometer Survey System (GGSS) Data Processing and Data Use, Self- Gradient Calibration of the GGSS in a C-130 Aircraft, Gravity Gradiometer Data Processing Using the Karhunen-Loeve Method, Numerically Deriving the Kernels of ... |
|
| Time Domain Wave Propagation in Multilayered Integrated Circuits |
JAN 87 |
|
| Authors:
J. A. Kong; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| During this period, we have (1) modeled and calculated the impedance parameters and propagation characteristics of simple structures, (2) analyzed the transient response of signal transmission on strip lines with perpendicularly crossing strips geometry and (3) the transient response of point and line sources excitation in two-layer media, (4) generalized the method of characteristics for signal propagation on nonuniformly coupled transmission lines, and (5) studied the models of for vias ... |
|
| The Role of Lithium Passivation in LiSO2 |
29 DEC 86 |
27 pages |
| Authors:
Harlan F. Bittner; AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB
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| The role of the lithium passivation layer on lithium sulfur dioxide (Li/SO2) cell performance has been studied. Polarization attributed to the Li layer was characterized; an initial polarization (voltage delay) was in some cases followed by a secondary polarization. It was found that long-term, low rate discharge modified the Li passivation layer, which resulted in increased Li corrosion and decreased cell capacity. The degradation was greater at high temperature. Short-term ... |
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| Molecular Beam Epitaxial Growth and Electrical and Optical Investigations of III-V Compound Semiconductors |
22 DEC 86 |
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| Authors:
Anupam Madhukar; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF AEROSPACE ENGINEERING
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| A list of capital equipment acquired for updating the Perkin-Elmer 400 molecular beam epitaxial growth system and establishing capabilities for reflection high energy electron diffraction intensity dynamics, spectroscopic ellipsometry in the near Infrared regime, Hall mobility, capacitance voltage and current voltage measurements is provided, along with a description of the salient features of each of these systems. Keywords: Molecular Beam Epitaxy; Spectroscopic Ellipsometry; Photoluminescence; Hall Mobility. |
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| Low Pass T-Section Digital Phase Shifter Apparatus. |
16 DEC 1986 |
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| Authors:
Binboga S. Yarman; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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| A low pass T-section digital phase shifter apparatus having a pair of serially connected inductor-diode combination connected in series which includes a parallel circuit connected between the common junction and ground. The parallel circuit has an inductor in parallel with a series capacitor and diode to provide a balanced insertion loss at each diode switching state. When the diodes are in the forward-biased state they act as closed short circuit ... |
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CAPACITANCE
