Ethnic Intermarriage among Immigrants: Human Capital and Assortative Mating

This paper analyzes the determinants of interethnic marriages among immigrants in the United States. The dependent variable is intermarriage across ethnic groups and the inclusion of the explanatory variables is justified by a simple rational choice economic model. A binomial logistic regression is estimated using data from the 1980 US Census, the last Census where post-migration marriages can be identified. Results show that the probability of intermarriage increases the longer a migrant resides in the U.S. and the younger the age at arrival. Both relationships can be attributable to the accumulation of US-specific human capital and an erosion of ethnic-specific human capital. Inter-ethnic marriages are more likely between individuals with similar education levels, providing evidence of positive assortative mating by education for immigrants. Construction of the availability ratio for potential spouses and group size are unique to this study, providing a more accurate measure of the marriage market by using data from several Censuses. Intermarriage is lower the greater the availability ratio and the larger the size of the group. Linguistic distance indirectly measures the effect of English language ability at arrival and is found to be a significant negative predictor of intermarriage. Those who report multiple ancestries and who were previously married are more likely to intermarry.immigrants, marriage, ethnicity/ancestry

Extended Instruction in Business Courses to Enhance Student Achievement in Math

Poor achievement on standardized math tests negatively impacts high school graduation rates. The purpose of this quantitative study was to investigate if math instruction in business classes could improve student achievement in math. As supported by constructivist theory, the students in this study were encouraged to use prior knowledge and experiences to make new connections between math concepts and business applications. The key research question examined if there was a significant increase in the standardized mathematics test scores of students enrolled in business classes with extended mathematics instruction compared to the standardized test scores of students not enrolled in business classes with extended mathematics instruction. The 2-sample t-test was used to compare the scores of 42 students in the treatment group to the scores of 47 students in the control group. Based on the findings, there was not a significant difference in the scores of the treatment and control groups. Recommendations for future research included redesigning the treatment to involve additional areas of mathematics instruction as well as extending the number of weeks for the treatment. This study may effect social change by informing teachers and administrators at the local site of the need to examine the effects of incorporating math into other content areas and recommending continued research in this area. The additional exposure, practice, and learning opportunities in math may help high school students achieve in mathematics and ultimately improve graduation rates

Longitudinal dispersion in nonuniform isotropic porous media

A theoretical and experimental investigation has been made of the longitudinal dispersion of chemically and dynamically passive solutes during flow through nonuniform, isotropic porous media. Both theoretical and experimental results are limited to the high Peclet number, low Reynolds number flow regime. The goal of the theoretical investigation is to provide a quantitative method for calculating the coefficient of longitudinal dispersion using only measurable structural features of the porous medium and the characteristics of the carrying fluid and solute. A nonuniform porous medium contains variations in grain scale pore structure, but is homogeneous at the macroscopic level for quantities such as the permeability or porosity. A random capillary tube network model of nonuniform porous media is developed which uses a pore radius distribution and pore length distribution to characterize the grain scale structure of porous media. The analysis gives the asymptotic longitudinal dispersion coefficient in terms of integrals of kinematic properties of solute particles flowing through individual, random capillary tubes. However, shear dispersion within individual capillary tubes is found to have negligible impact on the overall longitudinal dispersion in porous media. The dispersion integrals are evaluated using a Monte Carlo integration technique. An analysis of the permeability in nonuniform porous media is used to establish a proper flow field for the analysis of longitudinal dispersion. The experimental investigation of longitudinal dispersion is carried out by measuring (with conductivity probes) the development of an initially sharp miscible displacement interface. The experimentally determined longitudinal dispersion coefficients are found to be greater in nonuniform media than in uniform media when compared using Peclet numbers based on the geometric mean grain diameter. The experimental breakthrough curves also display highly asymmetrical shapes, in which the "tail" of the breakthrough is longer than would be expected from advection-diffusion theory. Although the theoretical model does not predict the tailing behavior, it is found that the leading portion of the breakthrough curve is described by advection-diffusion theory. The theoretically determined longitudinal dispersion coefficients lie roughly within a factor of 1.35 of the measured values. The material presented in this report is essentially the same as the thesis submitted by the author in partial fulfillment of the requirements for the degree of Doctor of Philosophy

Instabilities in droplets spreading on gels

We report a novel surface-tension driven instability observed for droplets spreading on a compliant substrate. When a droplet is released on the surface of an agar gel, it forms arms/cracks when the ratio of surface tension gradient to gel strength is sufficiently large. We explore a range of gel strengths and droplet surface tensions and find that the onset of the instability and the number of arms depend on the ratio of surface tension to gel strength. However, the arm length grows with an apparently universal law L ~ t^{3/4}

America. On the merced, Yosemite valley, California

Siglo XIX. - Forma parte del álbum 24 Treasure Spots of the Worl

Effects of Exploratory Studies Facility construction water on radionuclide release

ESF is a planned underground laboratory to conduct subsurface explortion and testing in support of site suitability determination and license application for a potential high-level nuclear waste repository at Yucca Mountain. ESF design includes a 7.6 m dia, 7.8 km long tunnel loop of two main access ramps from the surface down to a main drift along the conceptual repository horizon in a fractured, welded tuff (Topopah Spring member of Paintbrush Tuff). The use of water during excavation of the ESF is expected to have negligible effects on radionuclide release from waste packages, provided the volume of water lost to the geologic environment is limited to 7.4 m{sup 3}/m of linear excavation

Dominance and Deference: The Inability to Coexist As Expressed by Conrad and Orwell

My thesis has provided an analysis of the ways in which Joseph Conrad in The Secret Agent and George Orwell in Burmese Days portray masculinity in their novels. My mission has been to prove the following statement: The new, modern masculinity is a masculine identity that arises in modernist literature as a product of an evolving British society; it is distinct from stereotypical masculinity, yet stereotypical masculinity does not allow for the two to coexist. My analysis explains that stereotypical masculinity does not allow the new, modern masculinity to coexist with it because the presence of the new, modern masculinity permits men to adopt bodies and mannerisms that lead to the exasperation of societal factors that weaken stereotypical masculinity

IMPLEMENTING LEAN SIX SIGMA PRINCIPLES IN THE AUTOMOTIVE COLLISION REPAIR INDUSTRY: A THREE CASE STUDY ANALYSIS

This research provides the automotive collision industry empirical evidence of the effects of Lean-for-Collision Training and Development Initiatives facilitated by a targeted sample of three automotive collision repair centers. Through formal interview and review of artifacts, the findings showcased in this study are in terms of automotive collision industry metrics; a balance in cost, quality, and service delivery, specifically, vehicle cycle-time, vehicle touch-time, employee turnover, and the Return-on-Investment (ROI) of their Lean training. In addition, this research provides automotive collision centers with critical knowledge and understanding of how to successfully navigate and progress through the Framework for Six Sigma Implementation in SMEs to achieve and develop a Lean culture in order to ultimately sustain the results of Lean Six Sigma training implementation

The Widening Black-White Wage Gap among Women

Abstract. We utilize over 30 years of the Current Population Survey to examine labor force participation and wage patterns among five cohorts of white and black women. By estimating wages using four selection correction techniques in determining the wage gap for women who are not in the labor force, we provide evidence of the changing role of selection among women over time. We find an increasing observed wage gap between white and black women for younger cohorts; however, the decline in selection for both black and white women does not explain the rising wage gap

The Widening Black-White Wage Gap among Women

Abstract. We utilize over 30 years of the Current Population Survey to examine labor force participation and wage patterns among five cohorts of white and black women. By estimating wages using four selection correction techniques in determining the wage gap for women who are not in the labor force, we provide evidence of the changing role of selection among women over time. We find an increasing observed wage gap between white and black women for younger cohorts; however, the decline in selection for both black and white women does not explain the rising wage gap