Stochastic epidemic models: a survey

This paper is a survey paper on stochastic epidemic models. A simple stochastic epidemic model is defined and exact and asymptotic model properties (relying on a large community) are presented. The purpose of modelling is illustrated by studying effects of vaccination and also in terms of inference procedures for important parameters, such as the basic reproduction number and the critical vaccination coverage. Several generalizations towards realism, e.g. multitype and household epidemic models, are also presented, as is a model for endemic diseases.Comment: 26 pages, 4 figure

Real-ationships an educational philosophy advocating for an increased effort towards authentic teacher-student relationships

The impact an educator has on a student\u27s life far exceeds the academic content being learned. The development of positive relationships between the teacher and student fosters the student\u27s feelings of connectedness to their education. A strengthened connection leads to an increase in motivation, effort, and achievement. Unfortunately, positive teacher-student relationships are not the primary focus of today\u27s educational systems. An educational philosophy advocating for real-ationships emphasizes the need for positive teacher-student relationships. The real-ationship\u27s characteristics and implementation are described in detail, while real-life examples depict the positive experiences I have had as an educator within real-tionships. It is a philosophy that can be adopted by any teacher, any grade, at any type of school: it offers a \u27way of being\u27 that cultivates healthy, positive encounters, interactions, and connections with one\u27s students

Exxon Mobil Corp. v. Allapattah Services Inc.

In diversity cases, only one plaintiff or class member must satisfy the amount in controversy requirement

Neutronics Studies on the NIST Reactor Using the GA LEU fuel

The National Bureau of Standards Reactor (NBSR) located on the National Institute of Standards and Technology (NIST) Gaithersburg campus, is currently underway of fuel conversion from high enriched uranium (HEU) fuel to low enriched uranium (LEU) fuel. One particular challenging part of the conversion of the NBSR is the high average flux level (2.5×1014 n/cm2-s) required to maintain experimental testing capabilities of the reactor, without significant changes to the external structures of the reactor. Recently the General Atomics (GA) Training Research Isotopes General Atomics (TRIGA) fuel has shown some promising features as a LEU candidate for the high performance research reactors such as the NBSR. The GA fuel has a long history of success in conversion of research reactors since it was developed in 1980s. The UZrH compound in the GA fuel has seen success in long term TRIGA reactors, and is a proven safe LEU alternative. This study performs a neutronics evaluation of the TRIGA fuel under the schema of the NBSR’s heavy conversion requirements in order to examine whether the TRIGA fuel is a viable option for conversion of the NBSR. To determine the most optimal path of conversion, we performed a feasibility study with particular regard to the fuel dimensions, fuel rod configurations, cladding, as well as fuel structure selection. Based on the outcome of the feasibility study, an equilibrium core is then generated following the NBSR’s current fuel management schema. Key neutronics performance characteristics including flux distribution, power distribution, control rod (i.e., shim arms) worth, as well as kinetics parameters of the equilibrium core are calculated and evaluated. MCNP6, a Monte Carlo based computational modeling software was intensively used to aid in these calculations. The results of this study will provide important insight on the effectiveness of conversion, as well as determine the viability of the conversion from HEU to LEU using the GA fuel

The Beauty Industry\u27s Influence on Women in Society

There has been a significant amount of research done on the effect that advertising in the fashion and beauty industry has on women. By creating advertisements with unrealistic images of beauty, it has resulted in anxiety, low self-esteem, and low self-confidence in many women. Most of these negative emotions stems from unhappiness among body and appearance. Less research has been performed relating to cosmetics and how this can have an influence on women, and how women can use cosmetics to manipulate their appearance. This paper first discusses the existing research that focuses on the cosmetic industry’s influence on women. From this research, a general survey was created in order to gather general information about a group of college student’s cosmetic usage, habits, and beliefs. The results indicate that college women are high users of cosmetics, are very aware of the cosmetic industry, and that some individual differences can have an effect on the choices a woman makes regarding cosmetics

Comparison of the Lens Protein Profiles of Three Species of Ozark Salamanders

The vertebrate lens has a high protein content (35%), 80-90% of which is composed of the soluble, lens-specific structural proteins, the crystallins. The lens protein profiles of urodelan species have been found to be qualitatively distinct. On this basis the lens proteins have been proposed as a measure of true speciation in urodelans. This paper is the result of our effort to derive a technique for comparison of lens protein profiles on a purely qualitative basis without utilizing the complex methodology employed by previous workers. With this object in mind, the lens protein profiles of Plethodon glutinosus, Ambystoma annulatum, and Ambystoma maculatum were studied to determine the degree of difference actually observable on a purely qualitative basis, and thus the applicability of this technique to urodelan taxonomy. Definite observable differences were found in the lens protein profiles of all species; thus confirming the potential value of this technique to urodelan taxonomy