Physical Sciences and Mathematics Commons^™

The Borwein Conjecture And Partitions With Prescribed Hook Differences, David Bressoud

David Bressoud

No abstract provided.

Decidability Of The Two-Quantifier Theory Of The Recursively Enumerable Weak Truth-Table Degrees And Other Distributive Upper Semi-Lattices, Klaus Ambos-Spies, Peter A. Fejer, Steffen Lempp, Manuel Lerman

Peter Fejer

We give a decision procedure for the ∀∃-theory of the weak truth-table (wtt) degrees of the recursively enumerable sets. The key to this decision procedure is a characterization of the finite lattices which can be embedded into the r.e. wtt-degrees by a map which preserves the least and greatest elements: a finite lattice has such an embedding if and only if it is distributive and the ideal generated by its cappable elements and the filter generated by its cuppable elements are disjoint. We formulate general criteria that allow one to conclude that a distributive upper semi-lattice has a decidable two-quantifier …

A Simple Model For Nonequilibrium Fluctuations In A Fluid, Alejandro Garcia, F. Baras, M. Malek Mansour

Alejandro Garcia

Presents a train model that shows the long-range spatial correlations of fluctuations in nonequilibrium fluid systems. Illustration of model through analysis of flat-car trains running on parallel tracks; Simulation of train model in computers; Theoretical analysis for fluctuations in the train model; Relationship between train model and the fluctuating hydrodynamic theory of fluids.

Characterization Of Ground And Excited Electronic State Deprotonation Energies Of Systems Containing Double Bonds Using Natural Bond Orbital Analysis, J. K. Badenhoop, Steve Scheiner

Steve Scheiner

Natural bond orbital analysis is applied to the ground and excited states of a set of neutral, cationic, and anionic doubly bonded species H_nC=XH_n (X=C, N, O) isoelectronic with ethylene. The character of the excitation is correlated with calculated charge shifts and geometry changes upon relaxation. For these planar molecules, depopulation of the π bond or population of the π∗ antibond causes an out‐of‐plane twist or pyramidalization upon relaxation correlated to the amount of charge shift. These nonplanar distortions generally lower the energy more than changes in bond lengths and angles. Population of a σ_XH^{∗ …}

The Inverse Problem Of The Calculus Of Variations For Scala Fourth Order Ordinary Differential Equations, Mark E. Fels

Mark Eric Fels

A simple invariant characterization of the scalar fourth-order ordinary differential equations which admit a variational multiplier is given. The necessary and sufficient conditions for the existence of a multiplier are expressed in terms of the vanishing of two relative invariants which can be associated with any fourth-order equation through the application of Cartan's equivalence method. The solution to the inverse problem for fourth-order scalar equations provides the solution to an equivalence problem for second-order Lagrangians, as well as the precise relationship between the symmetry algebra of a variational equation and the divergence symmetry algebra of the associated Lagrangian.

Secrets Of The Madelung Constant, Stan Wagon

Stan Wagon, Retired

No abstract provided.

Polynomials For Radicals, Stan Wagon

Stan Wagon, Retired

No abstract provided.

System For Synchronizing Execution By A Processing Element Of Threads Within A Process Using A State Indicator Us:5553305, Robert Iannucci, Steven Gregor

Robert A Iannucci

No abstract provided.

Answer To Question #26. Electromagnetic Field Momentum, Br Holstein

Barry R Holstein

No abstract provided.

Lion-Tailed Macaques (Macaca Silenus) In A Disturbed Forest Fragment: Activity Patterns And Time Budget, Shaily Menon, Frank Poirier

Shaily Menon

We describe the activity patterns and time budget of a feral group of lion-tailed macaques that were confined to a disturbed forest fragment of 65 ha and compare the results with those obtained for groups in protected forests. The degraded nature of the study site was reflected in low tree densities, low specific diversity, gaps in the girth distribution of trees, and frequent disturbance by humans. The study group of 43 subjects was twice as large as lion-tailed macaque groups in protected habitats. They spent the most time ranging (34.0%), followed by foraging (23.7%), feeding (17.9%), resting (16.0%), and other …

Development Of A Shear-Zone Bounded Block Uplift Within The Middle Crust Of The Archean Wyoming Province During Proterozoic Accretion, Laramie Mts., Wy, Phillip Resor, A Snoke, K Chamberlain

Phillip G Resor

No abstract provided.

How Can Software Reliability Engineering (Sre) Help System Engineers And Software Architects?, Robert Yacobellis

Robert H Yacobellis

No abstract provided.

Enhancing Quality Through An Integrated Approach To Supportability, Caroline Lubert, J. Knezevic

Caroline P Lubert

No abstract provided.

The Magic Of Imaginary Factoring, Stan Wagon

Stan Wagon, Retired

No abstract provided.

Understanding Alpha Decay, Br Holstein

Barry R Holstein

The subject of alpha decay is an important part of a course in modern physics, as it provides a clear experimental manifestation of the phenomenon of barrier penetration. The traditional approach, based on Gamow's complex eigenvalue method, raises a number of questions which can be answered by employing the older but less well-known procedure of summing over scattering states. Additional insights are gained by examination of the alpha decay system via more contemporary path integral based techniques.

Animating Calculus: Mathematica Notebooks For The Laboratory, E. Packel, Stan Wagon

Stan Wagon, Retired

No abstract provided.

Nonparametric Regression Using Bayesian Variable Selection, Michael Smith, Robert Kohn

Michael Stanley Smith

No abstract provided.

Finite Sample Performance Of Robust Bayesian Regression, Michael Smith, Sheather Simon, Kohn Robert

Michael Stanley Smith

No abstract provided.

Plant Conservation., Nat Quansah

Nat Quansah

No abstract provided.

A Variational Inequality For Marketable Pollution Permits, Anna Nagurney, Kathy Dhanda

Kathy K Dhanda

No abstract provided.

In-Situ Imaging Of Ionic Crystal Dissolution Using An Integrated Electrochemical/Afm Probe, Julie V. Macpherson, Patrick R. Unwin, Andrew C. Hillier, Allen J. Bard

Andrew C. Hillier

The kinetics and mechanism controlling dissolution from the (100) cleavage face of potassium bromide single crystals in acetonitrile solutions have been identified using a novel integrated electrochemical/AFM probe and a scanning electrochemical microscope (SECM). With both techniques, dissolution is induced by perturbing the dynamic dissolution/growth equilibrium at the crystal/solution interface through the electrochemical oxidation of bromide ions. SECM measurements demonstrate that the dissolution reaction is diffusion-limited under the experimental conditions, suggesting that the surface reaction is characterized by a rate constant in excess of 5 cm s-1 (assuming a first-order dissolution process). The topography of the dissolving surface has been …

An Almost Periodic Function Of Several Variables With No Local Minimum, Gregory S. Spradlin

Gregory S. Spradlin

Brain Activation Modulated By Sentence Comprehension, Marcel Adam Just, Patricia A. Carpenter, Timothy A. Keller, William F. Eddy, Keith R. Thulborn

Marcel Adam Just

No abstract provided.

Testing For Absolute Purchaing Power Parity, Douglas G. Steigerwald, Collin Crownover, John Pippenger

Douglas G. Steigerwald

Purchasing power parity (PPP) is an equilibrium condition equating the nominal exchange rate between two countries with the relative price of an identical bundle of goods in each country. Previous time-series researchers use price indicies to study PPP, so they study relative PPP. We use new data that measures price levels, so we test absolute PPP. Price levels provide a test of absolute PPP because, unlike price indicies, do not contain a base period in which the nominal exchange rate equals the price ratio by construction. We find support for absolute PPP.

Measurement Of Double-Layer Forces At The Electrode/Electrolyte Interface Using The Atomic Force Microscope: Potential And Anion Dependent Interactions, Andrew C. Hillier, Sunghyun Kim, Allen J. Bard

Andrew C. Hillier

The forces between a silica probe and silica and gold substrates were measured with an atomic force microscope in the presence of a series of alkali-halide electrolyte solutions. The interaction between two silica surfaces was repulsive and could be accurately predicted by Derjaguin-Landau-Verwey-Overbeek theory. The silica surface was negatively charged at a pH of 5.5 and the effective surface potential increased in magnitude with decreasing electrolyte concentration. In contrast, the force between the silica probe and a gold substrate was attractive at open circuit. This interaction was a strong function of the potential applied to the gold and the nature …

Su(1,1) Algebraic Description Of One-Dimensional Potentials Within The R-Matrix Theory, Andrei Ludu

Andrei Ludu

No abstract provided.

Interface Roughening In A Hydrodynamic Lattice-Gas Model With Surfactant, Francis W. Starr, S. T. Harrington, B. M. Boghosian, H. E. Stanley

Francis Starr

No abstract provided.

A Control Basis For Multilegged Walking, Manfred Huber, Willard S. Macdonald, Roderic Grupen

Roderic Grupen

This paper presents a distributed control approach to legged locomotion that constructs behavior on-line by activating combinations of reusable feedback control laws drawn from a control basis. Sequences of such controller activations result in flexible aperiodic step sequences based on local sensory information. Different tasks are achieved by varying the composition functions over the same basis controllers, rather than by geometric planning of leg placements or the design of new task-specific behaviors. In addition, the device-independent nature of the control basis allows its generalization not only over task domains, but also over different hardware platforms. To show the applicability of …

Generalization Kdv Equation For Fluid Dynamics And Quantum Algebras, Andrei Ludu

Andrei Ludu

No abstract provided.

An Augmented Galerkin Algorithms For First Kind Integral Equations Of Hammerstein Type, S. Abbasbandy, E. Babolian

Saeid Abbasbandy

Recent papers, [1],[2] & [3], describe some algorithms for linear first kind integral equations. These algorithms are based on augmented Galerkin method and Cross-validation scheme [5]. The results show that, these algorithms work well for linear equations. In this paper we apply algorithms of [1] & [2] on non-linear first kind integral equations of Hammerstein type with bounded solution. In order to obtain a posteriori error estimate, we apply fifteen-point Gauss-Kronrod quadrature rule [4]. Finally, we give a number of numerical examples showing that the algorithms work well in practice.