Chemical application of diffusion quantum Monte Carlo

The diffusion quantum Monte Carlo (QMC) method gives a stochastic solution to the Schroedinger equation. This approach is receiving increasing attention in chemical applications as a result of its high accuracy. However, reducing statistical uncertainty remains a priority because chemical effects are often obtained as small differences of large numbers. As an example, the single-triplet splitting of the energy of the methylene molecule CH sub 2 is given. The QMC algorithm was implemented on the CYBER 205, first as a direct transcription of the algorithm running on the VAX 11/780, and second by explicitly writing vector code for all loops longer than a crossover length C. The speed of the codes relative to one another as a function of C, and relative to the VAX, are discussed. The computational time dependence obtained versus the number of basis functions is discussed and this is compared with that obtained from traditional quantum chemistry codes and that obtained from traditional computer architectures

Inelastic Collisions in an Ultracold quasi-2D Gas

We present a formalism for rigorous calculations of cross sections for inelastic and reactive collisions of ultracold atoms and molecules confined by laser fields in quasi-2D geometry. Our results show that the elastic-to-inelastic ratios of collision cross sections are enhanced in the presence of a laser confinement and that the threshold energy dependence of the collision cross sections can be tuned by varying the confinement strength and external magnetic fields. The enhancement of the elastic-to-inelastic ratios is inversely proportional to $\sqrt{\epsilon/\hbar \omega_0}$, where $\epsilon$ is the kinetic energy and $\omega_0$ is the oscillation frequency of the trapped particles in the confinement potential.Comment: 4 pages, 4 figure

Leaving Your Speech Rights at the Bar—\u3ci\u3eGentile v. State Bar\u3c/i\u3e, 111 S. Ct. 2720 (1991)

In Gentile v. State Bar the Supreme Court voided an attorney disciplinary rule regulating trial publicity for vagueness. The Court, however, upheld the substantive standard employed by the rule to identify dangerous speech. This standard restricts more attorney comments to the media than the Court has allowed for the press or public. This Note argues that the standard upheld in Gentile fails First Amendment scrutiny and proposes a response for states reviewing their professional disciplinary rules in light of Gentile. Adoption of this proposal will mitigate the danger of prejudicial trial publicity while recognizing the benefits of attorney publicity

Secret

For weeks we have been sitting here in this position. The camouflage nets have been draped over each vehicle, looking like a nightmare out of the Arabian Nights, for weeks now. Everything has a harried, slovenly look, but maybe it\u27s because this is a secret position. When we were ordered up here, it was under the heaviest cloak of secrecy. All identification was removed from the trucks, each man was inspected for any signs of which outfit he belonged to; they went through our clothing for addresses or cards. This was big, we had been told. We were to cross the Ruhr River and then it shouldn\u27t be too long before the Germans caught onto how useless it was to try to keep on fighting

New Approaches to Ultrasonic Flaw Classification Using Signal Processing, Modeling, and Artificial Intelligence Concepts

There are a number of modern approaches that can be used to characterize flaws in materials. For example, one method, which has been described recently by Wormley and Thompson [1], uses a model-based approach to obtain the “best fit” size and orientation parameters based on a simple equivalent shape such as ellipsoid. Before such sizing estimates can be activated, however, it is first necessary to determine if the unknown flaw being examined is a volumetric or crack-like flaw, since the sizing algorithm will be different for each case. This classification problem, although it is conceptually simpler than the more complete problem of flaw characterization, is, nevertheless, a difficult challenge because of the large number of parameters that can influence the resulting signals. A summary of our recent work on the flaw classification problem is given below. As will be shown, we have chosen to use a combination of signal processing, modeling and artificial intelligence tools to try to pare down the complexity of the ultrasonic responses and isolate those features that are dependent only on flaw-type

The Mission of the Remnant: To Reveal and Proclaim the Glory of God

This article will interpret the concept of “God’s glory,“ survey briefly the importance the Bible gives to the mission of proclaiming God’s glory, and deal with the practical questions of how our ministry and mission can reflect the mission of the remnant, to “give glory to God.

American Operas Based on the Plays of William Shakespeare, 1948--1976. (Volumes I and II).

A brief history of the origins of opera in the United States identifies titles, composers, and premieres to establish the point that composers in America were active in writing operas and that the music of European composers were available to them as models for their own works. A history of Shakespearean operas from their origin in the late seventeenth century in England to the present (1985) follows to illustrate that Shakespearean operas by American composers did not appear until after the Second World War. Eleven American composers are cited with their Shakespearean works. Their operas are grouped under three headings: festive comedies, dark comedy and romance, and tragedies. Among the comedies are three operas based on The Taming of the Shrew: Christopher Sly by Dominick Argento; and two operas of the same title as the play by Philip Greeley Clapp and Vittorio Giannini, respectively. The other comedies are Twelfth Night by David Amram, Love\u27s Labour\u27s Lost by Nicolas Nabokov, and Night of the Moonspell--after A Midsummer Night\u27s Dream--by Elie Siegmeister. A dark comedy, All\u27s Well That Ends Well by Mario Castelnuovo-Tedesco, and a romance, Winter\u27s Tale by John Harbison, are discussed together. From the tragedies are Prince Hamlet by Sam Raphling and two operas based on Antony and Cleopatra by Louise Gruenberg and Samuel Barber, respectively. Each of the operas is discussed according to the choice of characters, their voice classification, the instrumentation and size of the orchestra, the comparative lengths of the operas in acts and scenes, the similarity or departure from the story line of the play, and the manner in which the libretto is derived from Shakespeare\u27s text. Two hundred and eighty-five musical examples illustrate points concerning instrumental music, musical characterizations, and vocal ensembles. Finally, the relationships among all the operas are discussed, and from these, conclusions are drawn and recommendations for future research indicated. An epilogue on why American composers are turning to the plays of Shakespeare as a basis for some of their operatic works suggests historical, dramatic, and musical reasons

Chet Baker\u27s Role in the Piano-Less Quartet of Gerry Mulligan.

The purpose of this study was to discover common traits and characteristics about Chet Baker\u27s early solo style. The primary sources for this investigation were the initial recordings of the Original Gerry Mulligan Quartet. Since this music was improvised, rather than notated, it was necessary to transcribe the pieces in order to create a musical score. The transcription process included the transfer of the scores to a computerized musical notation program. The resulting scores were then analyzed in order to determine the characteristics of Baker\u27s early playing and solo style, as well as formal structures of the compositions. Chapter one served as an introduction to Chet Baker and includes biographical information. The second chapter focuses on the eleven-month partnership of Gerry Mulligan and Chet Baker. A formal analysis of each piece is contained in chapter three and chapter four emphasizes various characteristics of Chet Baker\u27s early trumpet style. The appendixes contain eight analyzed transcriptions of the Gerry Mulligan Quartet\u27s first recordings

Designing and Developing an Alternative Implementation of the Digital Bathymetric Database, Variable Resolution (DBDB-V)

This documentation describes a project to design and develop an alternative implementation of the Digital Bathymetric Database Variable Resolution (DBDB-V) that will allow efficient ingestion into Geospatial Information System (GIS). DBDB-V is a well-known storage facility for wide-reaching bathymetry. It is created, maintained, and extensively used by the U.S. Navy, and it is seen in many applications within the public sector. Environmental Systems Research Institute (ESRI) develops a popular suite of GIS applications called ArcGIS Desktop that is used worldwide and offered to U.S. Navy programs though the Commercial Joint Mapping Toolkit (CJMTK). This thesis will examine the development of an ESRI-compatible spatial geodatabase (GDB) that will hold the DBDB-V data and provide native data ingestion into ESRI products thereby improving the efficiency of how bathymetry is used within the GIS. It will also investigate tools needed to build and update the geodatabase as well as to provide access to the data stored within it. The thesis will also consider test cases to validate the new geodatabase and its tools