Physical Sciences and Mathematics Commons^™

Symbolic Automation And Numerical Synthesis For Robot Kinematics, Jen Sriwattanathamma, Chung You Ho

Computer Science Technical Reports

This research analyzes three topics in robot arm kinematics. First, the direct kinematics which determines the Cartesian position and orientation of the end effector for the specified values of joint parameters is analyzed. Second, the differential motions concerning the differential relationships between the command variables in position and orientation of the end effector and the joint-controlled variables are studied. Finally, the inverse kinematics which determines the joint variables for a specified Cartesian position and orientation of the end effector is considered.

This dissertation presents a methodology for incorporating the artificial intelligence types of knowledge into automating solutions for the direct …

A Band And Bound Technique For Simple Random Algorithms, Vernon J. Rego

Department of Computer Science Technical Reports

No abstract provided.

Hydrodynamic Forces And Band Formation In Swimming Magnetotactic Bacteria, D. C. Guell, H. Brenners, Richard B. Frankel, H. Hartman

Physics

Dense suspensions of magnetotactic bacteria form long, thin, stable bands perpendicular to the common, net direction of motion of the cells in a magnetic field. A mechanism for this phenomenon is proposed in which the hydrodynamic coupling between two swimming cells is described in terms of an approximate, far-field solution for the flow around one swimming cell. The calculated hydrodynamic interaction force and torque based upon this analysis are of the correct orders of magnitude and in the right directions to provide a reasonable explanation for band formation and stability.

Machine Knowledge Maniputation Issues In Parallel Compilers, Ko-Yang Wang, Dennis Gannon, Piyush Mehrotra

Department of Computer Science Technical Reports

No abstract provided.

On The Bottleneck And Capacity Assignment Problems, Wojciech Szpankowski

Department of Computer Science Technical Reports

No abstract provided.

Elliptic Expert: The Design Of An Expert System For Elliptic Partial Differential Equations, Wayne R. Dyksen, Carl R. Gritter

Department of Computer Science Technical Reports

No abstract provided.

Hermite Interpolation Of Rational Space Curves Using Real Algebraic Surfaces, Chanderjit Bajaj, Insung Ihm

Department of Computer Science Technical Reports

No abstract provided.

Xellpack: An Interactive Problem Solving Environment For Elliptic Partial Differential Equations, Jophn P. Bonomo, Wayne R. Dyksen

Department of Computer Science Technical Reports

No abstract provided.

Effects Of Autonomy On Maintaining Global Serializability In Heterogeneous Database Systems, W. Du, Ahmed K. Elmagarmid, Y. Leu, S. F. Ostermann

Department of Computer Science Technical Reports

No abstract provided.

Quasi Serializability: A Correctness Criterion For Interbase, Ahmed K. Elmagarmid

Department of Computer Science Technical Reports

No abstract provided.

A Dimensionality Paradigm For Surface Interrogations, Christoph M. Hoffmann

Department of Computer Science Technical Reports

No abstract provided.

Quantitative Footprinting Analysis Using A Dna-Cleaving Metalloporphyrin Complex+, James C. Dabrowiak, Brian Ward, Jerry Goodisman

Chemistry - All Scholarship

The results of quantitative footprinting studies involving the antiviral agent netropsin and a DNA-cleaving cationic metalloporphyrin complex are presented. An analysis of the footprinting autoradiographic spot intensities using a model previously applied to footprinting studies involving the enzyme DNase I [Ward, B., Rehfuss, R., Goodisman, J., & Dabrowiak, J. C. (1988) Biochemistry 27, 1198-12051 led to very low values for netropsin binding constants on a restriction fragment from pBR-322 DNA. In this work, we show that, because the porphyrin binds with high specificity to DNA, it does not report site loading information in the same manner as does DNase I. …

Distributed Operation Language For Specification And Processing Of Multidatabase Applications, Marek Rusinkiewicz, Kanchei Loa, Ahmed K. Elmagarmid

Department of Computer Science Technical Reports

No abstract provided.

Convex Decompositions Of Simple Polyhedra, Chanderjit Bajaj, Tamal K. Dey

Department of Computer Science Technical Reports

No abstract provided.

Microstructure Of Epitaxial Ybba2Cu3O7 Superconducting Films Grown By A New Liquid-Gas-Solidification Technique, C.H. Chen, H.S. Chen, Sy_Hwang Liou

Sy-Hwang Liou Publications

We have studied the microstructures of epitaxial YbBa₂Cu₃O₇ superconducting films grown on SrTiO₃ [100] and [110] substrates by a new liquid-gas-solidification processing technique. Films grown on SrTiO₃ [100] and [110] substrates are epitaxially oriented with [001] and [110] axes normal to the film surface. Twinned domains of ~200 Å in size are observed in the [001] oriented films. Most defects observed can be attributed to the presence of stacking faults along the c axis. The presence of Cu-O bilayer defects is also observed. Rapid oxygen diffusion in the liquid phase is found to …

Non-Algorithmic Load Imbalance Effects For Domain Decomposition Methods On A Hypercube, Dan C. Marinescu, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

A Parallel Implementation Of Stickel's Ac Unification Algorithm In A Message-Passing Environment, David John Kleikamp, Ralph W. Wilkerson

Computer Science Technical Reports

Unification algorithms are an essential component of automated reasoning and term rewriting systems. Unification finds a set of substitutions or unifiers that, when applied to variables in two or more terms, make those terms identical or equivalent. Most systems use Robinson's unification algorithm or some variant of it. However, terms containing functions exhibiting properties such as associativity and commutativity may be made equivalent without appearing identical. Systems employing Robinson's unification algorithm must use some mechanism separate from the unification algorithm to reason with such functions. Often this is done by incorporating the properties into a rule base and generating equivalent …

A System For The Diagnosis Of Faults Using A First Principles Approach, Barbara A. Smith, Ralph W. Wilkerson

Computer Science Technical Reports

One of the primary areas of application of Artificial Intelligence is diagnosis. Diagnosis from first principles is a diagnostic technique which uses knowledge of the designed structure and function of a device to determine the possible causes of the malfunction.

This work builds on the foundation of a theory of diagnosis by implementing and extending the theory. A correction to the algorithm which defines the theory is presented. The theory is extended for multiple sets of observations of the system and measurement data.

A fundamental problem in diagnosis is selecting the measurement which will be of the most benefit in …

Polymer Science In Romania I: "Petru Poni" Institute Of Macromolecular Chemistry, Iasi, Romania, Otto Vogl, Cristofor I. Simionescu, Ioan I. Negulescu

Emeritus Faculty Author Gallery

No abstract provided.

U.S.-Japan Seminar: "Synthesis, Properties And Reactions Of Specialty Polymers", Otto Vogl, Hiroshi Sumitomo

Emeritus Faculty Author Gallery

No abstract provided.

The Soils Of The Salmon Gums District, Western Australia, George Henry Burvill

Technical Bulletins

Most of the soils are grey and brown solonized soils. The subsoils, to about 2 m, are calcareous sandy clays with limestone rubble, but there are three main surface variations: sandy surfaced, 5-30 cm deep, passing abruptly to the sandy clay subsoil with lime nodules. The Circle Valley sand and Scaddan sand are major types. Scaddan sand has a domed subsoil clay. Powdery calcareous sandy loam; and clay loam and clay with some lime in the subsoil, but less than in 1 and 2.

Safe Disposal Of Pesticide Containers And Residue, Doug Johnson, Monroe Rasnake, James Martin

Soil Science News and Views

The use of pesticides (herbicides, insecticides, fungicides, etc.) has been an important factor in improving productivity of American agriculture to the point that quantity and quality of food and fiber produced by American farmers is unequalled in the world. However, in recent years, increased concern is being expressed regarding potential harmful effects of pesticide use on the environment. Most farmers want to know how to safely handle pesticides and dispose of waste materials, and the pesticide industry is working hard to develop better systems for handling pesticides. However, poor disposal practices are still too common.

Nuclear-Spin Relaxation In Molecular Solids With Reorienting Methyl And T-Butyl Groups: The Spectral Density And The State Of The Solid, Peter A. Beckmann, Audrey I. Hill, Ellen B. Kohler, Hong Yu

Physics Faculty Research and Scholarship

There are two solid phases which either have a large hysteresis of at least 90 K, or are both stable below 200 K. The sample melts at 262 K. We interpret the high-temperature phase R-versus-T-1 data with three models. First, we adopt a one-correlation-time model using a Davidson-Cole spectral density which suggests that there is a distribution of correlation times, or, equivalently, a distribution of activation energies for t-butyl and methyl group reorientation. In this case, the methyl and t-butyl reorientation is characterized by a cutoff activation energy of 17±1 kJ/mol which is to be compared with 18±1 kJ/mol in …

Parenago 1540: A Pre-Main-Sequence Double-Lined Spectroscopic Binary Near The Orion Trapezium, Laurence A. Marschall, Robert D. Mathieu

Physics and Astronomy Faculty Publications

Spectroscopic and photometric observations of the star Parenago 1540 (V = 11.3), located 10 arcmin west of the Trapezium in Orion, have shown the star to be a pre-main-sequence double-lined spectroscopic binary. Thirty-seven radial-velocity measurements were obtained from which the orbital elements of the binary were determined, in particular an orbital period P = 33.73 + 0.03 days and an eccentricity of e = 0.12 + 0.01. High-dispersion spectra reveal strong Li 6707 A absorption lines in each of the components of P1540. A spectrum at lower dispersion also shows strong Ca II H and K emission lines, not …

Nd:Lna Laser Optical Pumping Of ⁴He: Application To Space Magnetometers, R. E. Slocum, Laird D. Schearer, P. Tin, R. Marquedant

Physics Faculty Research & Creative Works

We have observed Hanle signals and n=0, p=1 parametric resonances of ₂₃S¹ metastable helium atoms in a discharge cell by optically pumping the helium atoms with a tunable Nd:LNA laser. These resonances were used to construct a sensitive magnetometer for the measurement of very small magnetic fields. Since magnetometer sensitivity is proportional to the slope of the parametric resonance signal (signal amplitude divided by linewidth), the slopes for single-line laser pumping were compared with similar quantities obtained from conventional helium lamp pumping. Laser pumping yielded 45 times greater slopes with comparable power requirements, thus establishing the potential for …

Geology Newsletter- 1988, Department Of Geology

Geological and Environmental Sciences News

Vol. 1, No. 13

• Dear Alumni and Friends
• Core Research Studies
• Institute for Water Studies
• W. David Kuenzi Scholarship Fund
• Geology Development and Scholarship Fund Donations
• Faculty Briefs
• News from the Support Staff
• Geology/Earth Science Club
• Awards & Scholarships
• 1988 Speakers Program
• Alumni Lines

On The Possibility Of Quasi-Static Convection In The Quiet Magnetotail, Margaret G. Kivelson, Harlan E. Spence

Physics & Astronomy

Abstract

The magnetotail is known to serve as a reservoir of energy transferred into the terrestrial magnetosphere from the solar wind. In principle, the stored energy can be dissipated impulsively, as in a substorm, or steadily through the process of steady adiabatic plasma convection. However, some theoretical arguments have suggested that quasi-static adiabatic convection cannot occur throughout the magnetotail because of the structure of the magnetic field. Here we reexamine the question. We show that in a magnetotail of finite width, downtail pressure gradients depend strongly on the ratio of the potential across half the tail to the ion temperature …

Multilevel Asynchronous Iteration For Pdes, Dan C. Marinescu, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

A Simple Test For The Nth Term Of A Series To Approach Zero, Jonathan W. Lewin, Myrtle Lewin

Faculty and Research Publications

No abstract provided.

Anti-Cancer Action Of Metal Complexes: Electron Transfer And Oxidative Stress?, Peter Kovacic, William J. Popp, James R. Ames, Michael D. Ryan

Chemistry Faculty Research and Publications

Evidence is presented in support of an electron transfer mechanism for various metal complexes possessing anti-neoplastic properties. Cyclic voltammetry was performed on several metallocenes, bis(acetato)bis(imidazole)Cu(II), and coordination compounds (Cu or Fe) of the anti-tumor agents, bipyridine, phenanthroline, hydroxyurea, diethyldithiocarbamate, and α, α¹-bis(8-hydroxyquinolin-7-yl)-4-methoxytoluene. The favorable reduction potentials ranged from +0.5 to -0.5 V. Electrochemical behavior is correlated in some cases with structure and physiological activity. Relevant literature data are discussed.