Electron beam lithography is used for mask making, and offers promise for fabrication of high density integrated circuits since it does not have the inherent limitations of optical lithography. Investigations were conducted to obtain a better understanding of e beam resist dissolution with a direct application to the image transfer step in e beam lithography. Studies were performed with poly(methyl methacrylate), PMMA, which is a commonly used electron beam resist. The studies included the...

Topics: DTIC Archive, Bell,Alexis, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *X RAYS,...

During this grant we have focused on four tasks related to the POSTGRES project, namely: (1) refinement and implementation of the POSTGRES rules system; (2) integration of tertiary memory support into POSTGRES; (3) efficient support for very large arrays; (4) efficient support for expensive predicates. In this report, we discuss each in turn.

Topics: DTIC Archive, Stonebraker, Michael, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES,...

An explanation is proposed for an artificial cooling effect seen in electrostatic particle-in-cell plasma simulations. Further simulations are done which test and support the explanation.

Topics: DTIC Archive, Lawson,William S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *COOLING,...

The non-uniform (non-linear) equilibria of the classical (short circuit) Pierce diode and the extended (series RLC external circuit) Pierce diode are described theoretically, and explored via computer simulation. It is found that most equilibria are correctly predicted by theory, but that the continuous set of equilibria of the classical Pierce diode at alpha = 2 pi are not observed. The stability characteristics of the non-uniform equilibria are also worked out, and are consistent with the...

Topics: DTIC Archive, Lawson, William S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *COMPUTERIZED...

The objective of this research is to study the feasibility of computing electromagnetic wave scattering by objects which are buried or partially buried in a lossy ground. The datas obtained through computer solutions of the related Maxwell's Equations can be applied to detection of plastic land mines, tunnels and natural resources. The method used in this investigation is based on the Unimoment method, a unique hybrid of analytical and numerical methods. The extension of the method to include...

Topics: DTIC Archive, Mei,K K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *Electromagnetic...

Evolving developments in fundamental concepts, materials, and fabrication are making possible new developments and discoveries over a broad spectrum of the nonlinear photonic microstructure field. This includes phenomena associated with sub-micron structures to increase both electronic and photonic confinement, distributed nonlinear photonic interactions in traps and other microstructures, and nonlinear photonic interactions in which the fully quantized nature of the radiation field is...

Topics: DTIC Archive, Gustafson, T K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *ELECTRONICS,...

In the last QPR, it was shown that our simulation exhibited strong ion trapping at saturation in the lower-drift-velocity regime with vE less than vti as our model had assumed a constant density and vE drift. The typical total ion momentum (Fig. 1a) and ion kinetic energy (Fig. 1b) are exponentially growing in time in the linear regime. In Fig. 1a, the net ion momentum increases in the negative x direction which is the wave propagation direction. Recall that ions in our model are initially in...

Topics: DTIC Archive, Birdsall, C. K., CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB,...

We identify mechanisms for particle transport across a cross-field sheath. We present a study of E x B drift motion in a vortex in which the ion drifts are perturbed by their finite gyroradii and electron drifts are perturbed by one or more traveling waves. Large scale vortices, which are the result of nonlinear saturation of the Kelvin-Helmholtz instability resulting from shear in the E x B drift velocity, have been observed in plasma simulations of the cross- field sheath. Small scale...

Topics: DTIC Archive, Parker, S E, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *STOCHASTIC...

The path-integral successive-collision methods is extended and applied to the set of linear Boltzmann equations for a very general initial- and boundary-value multi-swarm problem allowing for volume production, reactive collisions, and various particle-surface interaction processes. The complete formal solution is given, and its convergence is inferred from a simple physical argument. (Author)

Topics: DTIC Archive, Kuhn,S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *Boltzmann equation,...

A finite perturbation of the ion orbits leads to a nonlinear frequency shift that reduces the mode frequency and has a weak stabilizing effect on the lower-hybrid drift instability. This result is obtained from a self-consistent solution of the Vlasov-Poisson equations using perturbation theory in which the nonlinear dielectric function and the nonlinear temporal evolution of a single unstable mode in the low drift velocity regime are calculated analytically. (Author)

Topics: DTIC Archive, Chen,Yu-Jiuan, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *IONS, *NONLINEAR...

This paper describes the implementation history of the INGRES data base system. It focuses on mistakes that were made in progress rather than on eventual corrections. Some attention is also given to the role of structure design in a data base system implementation and to the problem of supporting non trivial users. Lastly, miscellaneous impressions of UNIX, the PDP-11 and data models are given. (Author)

Topics: DTIC Archive, Stonebraker, Michael, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES,...

Time harmonic modal electromagnetic fields in two-medium half spaces are investigated. For practical and numerical considerations, the primary sources of the modal fields are chosen to be the spherical multipoles, and the potential vectors are z-directed. It is shown that modal fields of such combination are not able to represent a conventional spherical modal field. The horizontal rotating potentials are added to ensure proper representation and fast convergence. The recurrence relations which...

Topics: DTIC Archive, Chang,S K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DIELECTRICS,...

For abstract see AD-A094 456.

Topics: DTIC Archive, Birdsall,C K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *COMPUTERIZED...

A one-dimensional numerical code has been written, which allows the time-dependent simulation of the Child-Langmuir diode and the plasma sheath problem. The model assumes a semi-infinite plasma reservoir from which particles can be emitted into a vacuum region where they can be accelerated or decelerated by means of an external potential on the anode, until they are eventually absorbed by the anode or sent back to the reservoir. Physical results are shown for both the time-independent and the...

Topics: DTIC Archive, Rousset,S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *Mathematical models,...

This document is the 1992 annual report of research conducted in the Electronics Research Laboratory at University Of California at Berkeley under the sponsorship of the Joint Services Electronics Program. The research covers the following project areas: Quantum Electronic Devices: (1-A) Nonlinear Optics in Compound Semiconductors (1-B) Ultrafast Optical Techniques (1-C) Optical Probing of Semiconductor Devices. and Interfaces by Electro-Optic and Photo-Elastic Effects; Electronic Devices:...

Topics: DTIC Archive, Hu, Chenming, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *ELECTRONICS, SIGNAL...

To study Markov processes with a multidimensional parameter necessitates the introduction of generalized processes that can be localized to surfaces. A vehicle for dealing with these is stochastic cochains, processes parameterized by k-dimensional surfaces in n-dimensional surface. The principal result of this project has been the development of a theory of stochastic cochains. (Author)

Topics: DTIC Archive, Wong,E, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *STOCHASTIC PROCESSES,...

The report summarizes the progress made during a three year period on research in data base management. The primary effort has been the design development of a major data base management system of the relational type, INGRES. In addition, a number of new directions, such as distributed data bases and data base machines were initiated. (Author)

Topics: DTIC Archive, Stonebraker,M, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES,...

This document contains papers about the use of both the understanding of instabilities, heating, transport and other phenomena in plasmas.

Topics: DTIC Archive, Birdsall,C K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *PLASMAS(PHYSICS),...

Contents: computer simulation of bounded plasma systems, with external circuits, is discussed in considerable detail; Artificial cooling of trapped electrons in bounded simulations was observed and is now attributed to noiseless injection: the cooling does not occur if random injection is used; The collector and source sheaths at the boundaries of warm plasma are treated in detail, including ion reflection and secondary electron emission at the collector; The Kelvin Helmholtz instability is...

Topics: DTIC Archive, Birdsall,Charles K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB,...

Topics: DTIC Archive, Birdsall, Charles K., CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SURFACE...

We have studied the rate of oxygen diffusion through ytterbium oxide, a buffer and dielectric layer used in high critical temperature superconducting (HTSC) structures. An epitaxial bilayer film of ytterbium oxide on yttrium-barium-cuprate (YBCO) was deposited onto an (001) oriented single crystal MgO substrate using the pulsed laser deposition technique. The rate of oxygen diffusion through the bilayer was investigated from 365 to 655 deg C by post deposition annealing individual sections of...

Topics: DTIC Archive, Lau, Kam Y., CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *PHASED ARRAYS,...

In this paper we report on query processing experiments that were performed in one distributed data base environment. In this environment we compared the strategy produced by a collection of algorithms on the basis of number of bytes moved. Among other conclusions we found that limited search algorithms do not perform very well compared to algorithms which exhaust all possible processing plans. (Author)

Topics: DTIC Archive, Epstein, Robert, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES,...

The Paige style Lanczos algorithm is an iterative method for finding a few eigenvalues of large sparse symmetric matrices. Some beautiful relationships among the elements of the eigenvectors of a symmetric tridiagonal matrix are used to derive a perverse starting vector which delays convergence as long as possible. Why such slow convergence is never seen in practice is also examined. (Author)

Topics: DTIC Archive, Scott,D S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *CONVERGENCE,...

This reference manual for the INGRES data base system documents the use of INGRES in a very terse manner. It is divided into four parts: (1) Quel: describes the commands and features which are used inside of INGRES; (2) Unix: describes the INGRES programs which are executable as UNIX commands; (3) Files: describes some of the important files used by INGRES; and (4) Error: lists all the user generatable error messages along with some elaboration as to what they mean or what we think they mean.

Topics: DTIC Archive, Woodfill,John, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *MAN COMPUTER...

This paper constitutes Part II of a study proposing an integral-equation approach to linear longitudinal oscillations in collisionless plasma diodes with thin sheaths. The method was formally developed in Part I and is comprehensive in that it handles the combined initial-value and external-perturbation problem, thus including the eigenmode problem as a special case, and allows for explicit and simultaneous inclusion of three basic constituents of bounded plasma systems, namely the plasma...

Topics: DTIC Archive, Kuhn,S, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *INTEGRAL EQUATIONS,...

The report summarizes contributions in the realization of the DBR laser for integrated optics and in the achievement of 'kink-free' injection lasers.

Topics: DTIC Archive, Wang,Shyh, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SEMICONDUCTOR LASERS,...

A VAX 11/780 system has been expanded so as to facilitate the implementation of DELIGHT.MIMO, an interactive software system for the solution of optimal, worst case design of multivariable control systems. A SUN workstation - based system has been assembled for experiments in distributed computing for the optimal, integrated design of flexible structures and thier control systems.

Topics: DTIC Archive, Polak,Elijah, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *CONTROL SYSTEMS,...

A synthesis method based on geometrical optics for designing a dual reflector antenna system with an arbitrary phase and amplitude distribution in the aperture of the second reflector is presented. The first reflector may be illuminated by a pattern with an arbitrarily curved phase front. A pair of first order ordinary nonlinear differential equations of the form dy/dx = f(x, y) are developed for the system. Questions concerning uniqueness, existence, and bounds for the solutions are discussed....

Topics: DTIC Archive, Galindo, Victor, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *REFLECTORS,...

This analysis is concerned with the stability of random systems, that is, systems whose internal characteristics are governed by probability laws. Concepts of stability appropriate to random differential systems are formulated and discussed. Precise definitions of stability are stated and theorems interrelating these definitions are proven. Some particular types of stability investigated are, in the mean norm, in the ith moment, in probability, almost sure, and almost uniform-in-omega....

Topics: DTIC Archive, BHARUCHA, B H, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *STATISTICAL...

In this paper we report on query processing experiments that were performed in one distributed data base environment. In this environment we compared the strategy produced by a collection of algorithms on the basis of number of bytes moved. Among other conclusions we found that limited search algorithms do not perform very well compared to algorithms which exhaust all possible processing plans. (Author)

Topics: DTIC Archive, Epstein, Robert, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES,...

A DEC MicroVax II GPX Color workstation has been acquired for experimentation with the DELIGHT.MIMO interactive software system in the solution of optimal, worst case design of multivariable control systems. A SUN workstation - based system has been expanded for experiments in distributed computing for the optimal, integrated design of flexible structures and their control systems. Keywords: Computer aided design; Computer architecture; Man machine systems; Systems engineering.

Topics: DTIC Archive, Polak, Elijah, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *COMPUTER AIDED...

Topics: DTIC Archive, BRIDGES, W B, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *FLUID FLOW, *DRIFT,...

The standard recurrence scheme does not always yield accurate divided differences in finite precision arithmetic. When the function of interest is known analytically and/or its values are easily calculated, methods other than the recurrence scheme can be used. In particular, a table of divided differences can be regarded as a function of a special bidiagonal matrix. Formulas and computational techniques suitable for computing matrix functions may, thus, be exploited for divided differences....

Topics: DTIC Archive, McCurdy,Allan Charles, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB,...

Effects of the current distribution along the junction plane on the lateral and longitudinal mode behaviors of the semiconductor laser with a channeled-substrate planar (CSP) structure are investigated experimentally and theoretically. A new lsaer structure of the double-current-confinement CSP type, which has two electrodes for pumping and only one channel for stimulated emission (TEPOSE), was employed for this study. Current distribution profile of this laser can be varied by changing the...

Topics: DTIC Archive, Chen,Chung Yih, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SEMICONDUCTOR...

In this paper the goals of logical design for relational and DBTG databases are stated in terms of the operational requirements of database maintenance and redesign. A set of mapping rules for attaining these goals are then specified. The relational schemas that result from an application of the mapping rules are shown to be in the fourth normal form. (Author)

Topics: DTIC Archive, Wong, E, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES, *DATA...

An electron gun in which the cathode and accelerating regions are shielded from the magnetic field of the drift region is proposed. Beam synthesis techniques are utilized to obtain electrode configurations which produce a nearly laminar beam. Second order corrections to the beam synthesis method are found to be insignificant for the case of a large cathode width. Expression for the minimum noise-figure of crossed-field amplifiers is derived and its dependence on the space-charge parameter is...

Topics: DTIC Archive, Rao, R A, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *CROSSED FIELD DEVICES,...

Contents: Shielded-gun crossed-field amplifier; Backward-wave noise- figure studies; Noise-figure studies on forwardwave crossed-field amplifier; Cathode-region studies on crossed-field tubes; Characteristics of the smooth- bore magnetron.

Topics: DTIC Archive, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *CROSSED FIELD DEVICES, *MICROWAVE...

We have improved our method of loading particles in x,y so that the initial density n(x,y) is as near our theoretical equilibrium as possible. As a result, only a small amount of electron heating was observed in the first few cycles of upper hybrid oscillations. We have used small drift velocities (v subscript E less than or equal to v subscript ti) in our simulations to date, allowing electrostatic fields, zero beta. Unfortunately, this choice makes both the growth rates and saturation levels...

Topics: DTIC Archive, Birdsall,C K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *PLASMAS(PHYSICS),...

As part of a project to construct, model and compare very high performances Si and GaAs devices, deep-submicron Si MOSFETs have been investigated. Using a novel optical lithography process, these extremely high-gain MOSFETs with varying oxide thicknesses and channel lengths have been fabricated. Figure 1 shows a Scanning Electron Microscope(SEM)picture of a transistor cross-section with an effective channel length 0.2 micron, an oxide thickness of 86 A, and junction depth of 0.2 micron. Devices...

Topics: DTIC Archive, Oldham, W G, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SEMICONDUCTORS,...

The time dependent behavior of a transversely magnetized, two- dimensional plasma wall sheath has been studied through particle simulations, which have shown that the cross field sheath develops into a turbulent boundary layer, with strong potential fluctuations and anomalous particle transport. The driving mechanism is the Kelvin Helmholtz instability, which arises from the sheared particle drifts created near the wall. The sheath acquires an equilibrium thickness l sub x approx. 5 rho sub i,...

Topics: DTIC Archive, Theilhaber, K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *VORTICES, *PLASMA...

Spatial data objects often cover areas in multi-dimensional spaces and are not well represented by point locations. For example, map objects like countries, census tracts etc. occupy regions of non-zero size in two dimensions. A common operation on spatial data is to search for all objects in an area. An example would be to find all the countries that have land within 20 miles of a particular point. This kind of spatial search occurs frequently in computer aided design (CAD) and geo-data...

Topics: DTIC Archive, Guttman,Antonin, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *ALGORITHMS,...

The Joint Services Electronics Program (JSEP) is an important part of the electronics research at the University of California, Berkeley, JSEP is particularly important to the development of new research directions and new faculty investigators. It also provides much needed support for the more basic electronics research. Furthermore, JSEP has encouraged collaborative research involving multiple principal investigators per project. Over the period May 1987 to May 1990 JSEP has supported 20...

Topics: DTIC Archive, Oldham, W G, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *ELECTRONICS, *METAL...

This is a brief progress report, covering our research in general plasma theory and simulation, plasma-wall physics theory and simulation, and code development. Reports written in this period have been circulated separately. A publications list plus abstracts for two major meeting are included.

Topics: DTIC Archive, Birdsall, C K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SIMULATION,...

Harmonica (a CAD program) and a new circuit analysis program called Puff have been used to develop a computer-aided design/fabrication system. Using this system, one can design, simulate and build simple microwave circuits in less than a day. The system was used to develop a 3 GHz amplifier based on a Fujitsu packaged transistor and microstrip matching networks. The measured performance results agreed closely with those that the simulation predicted.

Topics: DTIC Archive, Varaiya, P P, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *CIRCUIT ANALYSIS,...

This paper describes the implementation history of the INGRES data base system. It focuses on mistakes that were made in progress rather than on eventual corrections. Some attention is also given to the role of structure design in a data base system implementation and to the problem of supporting non trivial users. Lastly, miscellaneous impressions of UNIX, the PDP-11 and data models are given. (Author)

Topics: DTIC Archive, Stonebraker, Michael, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *DATA BASES,...

A unique decomposition of active RC driving-point impedance functions is presented, which was obtained by considering the driving-point synthesis problem in terms of the reflection coefficient. Application of the decomposition has been shown to guarantee the realization of the driving-point impedance in Kinariwala's cascade configurations and Sandberg's special configurations, each containing one negative impedance converter. The method imposes no restriction on the impedance function, except...

Topics: DTIC Archive, MITRA, S K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *SYNTHESIS,...

Topics: DTIC Archive, Blackwell, D, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *STATISTICAL...

Contents: A pitfall in adaptive system design Calculation of channel capacity Controllability of systems with time lags Machines that generate regular Markov chains Another look at the sampling theorem and its extensions A note on Fano's inequality

Topics: DTIC Archive, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *ADAPTIVE CONTROL SYSTEMS,...

A triangular matrix reveals its eigenvalues on the main diagonal. By Schur's lemma any square matrix is unitarily similar to an upper triangular matrix with the eigenvalues arranged in any desired order along the diagonal. In practice the QR algorithm in real arithmetic produces a block triangular matrix in which the eigenvalues are likely to be in monotone decreasing order by absolute value down the diagonal. However, this monotonicity cannot be guaranteed and for some purposes the ordering by...

Topics: DTIC Archive, Parlett,B N, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB,...

We have improved our method of loading particles in x,y so that the initial density n(x,y) is as near our theoretical equilibrium as possible. As a result, only a small amount of electron heating was observed in the first few cycles of upper hybrid oscillations. We have used small drift velocities (v subscript E less than or equal to v subscript ti) in our simulations to date, allowing electrostatic fields, zero beta. Unfortunately, this choice makes both the growth rates and saturation levels...

Topics: DTIC Archive, Birdsall,C K, CALIFORNIA UNIV BERKELEY ELECTRONICS RESEARCH LAB, *PLASMAS(PHYSICS),...