A Computational Study of Thirteen-atom Ar-Kr Cluster Heat Capacities

Heat capacity curves as functions of temperature were calculated using Monte Carlo methods for the series of Ar_{13-n}Kr_n clusters (0 <= n <= 13). The clusters were modeled classically using pairwise additive Lennard-Jones potentials. J-walking (or jump-walking) was used to overcome convergence difficulties due to quasiergodicity present in the solid-liquid transition regions, as well as in the very low temperature regions where heat capacity anomalies arising from permutational isomers were observed. Substantial discrepancies between the J-walking results and the results obtained using standard Metropolis Monte Carlo methods were found. Results obtained using the atom-exchange method, another Monte Carlo variant designed for multi-component systems, were mostly similar to the J-walker results. Quench studies were also done to investigate the clusters' potential energy surfaces; in each case, the lowest energy isomer had an icosahedral-like symmetry typical of homogeneous thirteen-atom rare gas clusters, with an Ar atom being the central atom.Comment: 46 pages, 13 Figures combined in 2 .gif files, Journal of Chemical Physics, AIP ID number 508646JC

A computational study of 13-atom Ne-Ar cluster heat capacities

Heat capacity curves as functions of temperature were calculated using Monte Carlo methods for the series of Ne_(13-n)Ar_n clusters (0 <= n <= 13). The clusters were modeled classically using pairwise additive Lennard-Jones potentials. The J-walking (or jump-walking) method was used to overcome systematic errors due to quasiergodicity. Substantial discrepancies between the J-walking results and those obtained using standard Metropolis methods were found. Results obtained using the atom-exchange method, another Monte Carlo variant for multi-component systems, also did not compare well with the J-walker results. Quench studies were done to investigate the clusters' potential energy surfaces. Only those Ne-Ar clusters consisting predominately of either one or the other component had lowest energy isomers having the icosahedral-like symmetry typical of homogeneous 13-atom rare gas clusters; non-icosahedral structures dominated the lowest-energy isomers for the other clusters. This resulted in heat capacity curves that were very much different than that of their homogeneous counterpart. Evidence for coexistence behavior different than that seen in homogenous clusters is also presented.Comment: 45 pages, 11 Figures, figures in .gif format files. Journal of Chemical Physics, AIP ID number 513730JC

Alaska Agricultural Experiment Station Circular, No. 7

“P O T A T O E S are an important food in Alaska. Matanuska V alley farmers can produce enough to meet the needs of the Anchorage area if the crop can be kept satisfactorily from one year to the next. The Alaska climate, however, makes better-than-average storage and management necessary to insure a continuous supply throughout the year.Custom storage -- Storage pit -- House-basement storage -- Earth-covered storage -- Sawdust-covered storage -- Frame storage with shell circulation -- Round-roofed storages -- Matanuska Experiment Station storag

An Empirical Examination of the Usefulness of the Motley Fool\u27s Flow Ratio

An item in the Motley Fool recently caught our attention. The article “Cisco vs. Lucent: The Flow Ratio Tells All” (by Matt Richey, June 6, 2000, in The Motley Fool.fool.com), introduced a new ratio that Richey claimed to be useful for measuring the investment worthiness of a company. Since our Financial Statement Analysis course covers traditional ratio analysis and since we were exploring some research ideas on measuring liquidity, the Fool Ratio seemed worthy of investigatio

Boards Of Advisors In Small Businesses: An Empirical Profile Of Their Composition And Use

This article discusses the literature coverage on Boards of Advisors to date and provides the results of a study designed to determine the formation and composition of Boards of Advisors and the ways in which small businesses use such boards. Our study surveyed the Chief Executive Officers or Presidents of a large sample of small businesses. We found that there is very limited use of Boards of Advisors in small businesses and that many small business managers are not aware of the concept of a Board of Advisors. However, those small business managers (97%) that use a Board of Advisors characterize their interaction with their Boards of Advisors as good or excellent. When selecting board members, the responding executives seek practical experience, good “common sense” and industry experience as the most important types of expertise. Most board members were male (67%), active in business (90%), have managerial/strategy or law (52%) and are not compensated (53%)

The Standard Auditor\u27s Report: Preparer, User, And Student Reactions To The PCAOB Concept Release

Concerns about the usefulness of the Standard Audit Report (SAR) have been expressed by investors and other users of corporate financial statement for several decades. During 2011 the Public Company Accounting Oversight Board (PCAOB) reacted to those concerns by issuing Concept Release on Possible Revisions to the PCAOB Standards Related to PCAOB Standards (“Release”). This article provides a description of the SAR, a short history (timetable) of the pressures (surveys) to improve the SAR and events that have led to the eventual Release by the PCAOB. Feedback (comment letters and surveys) from professionals and professional organizations regarding the “Release” are examined and discussed. Accounting and finance majors, future preparers and users of the financial statements, were surveyed to determine both their reactions to the PCAOB’s SAR and whether their reactions were different than practitioners. This article concludes with an analysis of the results and implications for audit practice and education