Development of a VOR/DME model for an advanced concepts simulator

The report presents a definition of a VOR/DME, airborne and ground systems simulation model. This description was drafted in response to a need in the creation of an advanced concepts simulation in which flight station design for the 1980 era can be postulated and examined. The simulation model described herein provides a reasonable representation of VOR/DME station in the continental United States including area coverage by type and noise errors. The detail in which the model has been cast provides the interested researcher with a moderate fidelity level simulator tool for conducting research and evaluation of navigator algorithms. Assumptions made within the development are listed and place certain responsibilities (data bases, communication with other simulation modules, uniform round earth, etc.) upon the researcher

Study of a very low cost air combat maneuvering trainer aircraft

A very low cost aircraft for performing Air Combat Maneuvering (ACM) training was studied using the BD-5J sport plane as a point of departure. The installation of a larger engine and increased fuel capacity were required to meet the performance and mission objectives. Reduced wing area increased the simulation of the ACM engagement, and a comparison with current tactical aircraft is presented. Other factors affecting the training transfer are considered analytically, but a flight evaluation is recommended to determine the concept utility

Inequality and Network Structure

This paper explores the manner in which the structure of a social network constrains the level of inequality that can be sustained among its members. We assume that any distribution of value across the network must be stable with respect to coalitional deviations, and that players can form a deviating coalition only if they constitute a clique in the network. We show that if the network is bipartite, there is a unique stable payoff distribution that is maximally unequal in that it does not Lorenz dominate any other stable distribution. We obtain a complete ordering of the class of bipartite networks and show that those with larger maximum independent sets can sustain greater levels of inequality. The intuition behind this result is that networks with larger maximum independent sets are more sparse and hence offer fewer opportunities for coalitional deviations. We also demonstrate that standard centrality measures do not consistently predict inequality. We extend our framework by allowing a group of players to deviate if they are all within distance k of each other, and show that the ranking of networks by the extent of extremal inequality is not invariant in k.inequality;networks;coalitional deviations;power;centrality

Foreword

The University of Richmond Law Review is pleased to present the fifth annual Allen ChairSymposium issue. This special issue is intended as the literary culmination of the efforts of national legal scholars and students alike during the 1997 Allen Chair Symposium conducted by the University of Richmond School of Law. The symposium is held each Spring to create a forum for discourse on legal issues of national and international interest

Regulation of Expression of the Bacteriophage T4 Genes 45, 44, and 62

The functions of T4 genes 45, 44, and 62 are required for phage DNA replication. Some evidence suggests that in T4-infected E. coli these genes are cotranscribed in the 45 to 44 to 62 direction. In this study regulation of expression of genes 45, 44, and 62 has been examined by using SDS-polyacrylamide gel electrophoretic assays to analyze the protein products synthesized in T4-infected E. coli at various times after infection under different conditions. Genes 45, 44, and 62 were shown to be cotranscribed by the criterion of translational polarity, but the degree of polarity shown by gene 44 nonsense mutations on gene 62 expression was much greater than that shown by a gene 45 nonsense mutation on expression of genes 44 and 62. This difference suggests that genes 45, 44, and 62 may be transcribed in two modes: one mode being initiated at the promotor for gene 45 and a second mode being initiated at a gene 44 promotor. Additionally, characterization of a phage mutation that results in hyperproduction of the 44- and 62-proteins without affecting the level of synthesis of the gene 45 protein supported this hypothesis. The mutation (named H6) mapped between markers in genes 45 and 44, was cis-dominant, did not affect stability of mRNA for gene 44, and did not affect the temporal order of T4 gene expression except that it appeared to cause continued expression of genes 44 and 62 throughout the phage growth cycle. H6 might represent (1) mutation of a naturally occurring promotor to increased efficiency or (2) mutational creation of a secondary promotor for genes 44 and 62

Crystal Nucleation in a Supercooled Liquid with Glassy Dynamics

In simulations of supercooled, high-density liquid silica we study a range of temperature T in which we find both crystal nucleation, as well as the characteristic dynamics of a glass forming liquid, including a breakdown of the Stokes-Einstein relation. We find that the liquid cannot be observed below a homogeneous nucleation limit (HNL) at which the liquid crystallizes faster than it can equilibrate. We show that the HNL would occur at lower T, and perhaps not at all, if the Stokes-Einstein relation were obeyed, and hence that glassy dynamics plays a central role in setting a crystallization limit on the liquid state in this case. We also explore the relation of the HNL to the Kauzmann temperature, and test for spinodal-like effects near the HNL.Comment: 4 pages, 4 figure

The interaction between diabetes, body mass index, hepatic steatosis, and risk of liver resection: insulin dependent diabetes is the greatest risk for major complications

Background. This study aimed to assess the relationship between diabetes, obesity, and hepatic steatosis in patients undergoing liver resection and to determine if these factors are independent predictors of major complications. Materials and Methods. Analysis of a prospectively maintained database of patients undergoing liver resection between 2005 and 2012 was undertaken. Background liver was assessed for steatosis and classified as <33% and ≥33%. Major complications were defined as Grade III–V complications using theindo-Clavien classification. Results. 504 patients underwent liver resection, of whom 56 had diabetes and 61 had steatosis ≥33%. Median BMI was 26kg/m2 (16–54kg/m 2). 94 patients developed a major complication (18.7%). BMI ≥ 25kg/m2

God Be With Our Boys To-night

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