Virginia Commonwealth University

About: Virginia Commonwealth University is a education organization based out in Richmond, Virginia, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 23822 authors who have published 49587 publications receiving 1787046 citations. The organization is also known as: VCU.

Assembling crystals from clusters

Abstract: It is shown that the stability of a cluster can be substantially enhanced by changing its size and/or composition so as to take advantage of the electronic shell filling as well as close atomic packing. The interaction between two such clusters is found to be weak and can form the basis for synthesizing a new class of cluster-assembled crystals with uncommong properties.

Daily Assessment of Pain in Adults with Sickle Cell Disease

Abstract: Although outpatient, emergency department, and hospital visits have been used as indicators of sickle cell disease severity, the relationship between painful episodes and subsequent use of health c...

Regression-Type Estimation of the Parameters of Stable Laws

Abstract: A regression-type method of estimating the four parameters of a stable distribution is presented. The estimators found are consistent and approximately unbiased for moderately large sample sizes. Their efficiencies, found through a simulation study, are greater than those of most other estimators for large portions of the parameter space. Moreover, the amount of computation involved is minimal and apparently less than that needed by the methods of Paulson, Holcomb, and Leitch (1975) and of maximum likelihood (DuMouchel 1971). Finally, this method is applied to stock price data from four corporations.

Models for the joint effect of genotype and environment on liability to psychiatric illness

Abstract: The authors present three major models for the joint effect of genes and environment on liability to psychiatric illness: additive effects of genotype and environment, genetic control of sensitivity to the environment, and genetic control of exposure to the environment. Each model is illustrated by several examples, including a quantitative one. The authors attempt to demonstrate that genes and the environment can interact in several interesting and potentially subtle ways, that these interactions can be expressed in simple models from which clear empirical predictions can be generated, and that elucidation of the etiology of psychiatric disorders will require the consideration of both genetic and environmental risk factors.