Economic Mobility of Immigrants in the United States

Explores how immigrant economic mobility has changed over time, and to what extent immigrant economic mobility is similar to that of U.S. citizens

Organic Rankine cycle receiver development

The selected receiver concept is a direct-heated, once-through, monotube boiler operated at supercritical pressure. The cavity is formed by a cylindrical copper shell and backwall, with stainless steel tubing brazed to the outside surface. This core is surrounded by lightweight refractory insulation, load-bearing struts, and an outer case. The aperture plate is made of copper to provide long life by conduction and reradiation of heat away from the aperture lip. The receiver thermal efficiency is estimated to be 97 percent at rated conditions (energy transferred to toluene divided by energy incident on aperture opening). Development of the core manufacturing and corrosion protection methods is complete

Welfare Reform: Success with Trouble Spots

The papers included in this [welfare] symposium provide excellent examples of this growing body of research. The most important issues addressed by these papers are whether the effects of welfare reform are similar in urban and rural areas and across racial and ethnic groups, whether welfare reform affects children, and whether adult and child well-being vary depending on the circumstances under which families leave welfare. The papers also bear on the big issues of welfare use, employment, earnings, and poverty. [This article comments on articles in a welfare symposium in this issue of the Eastern Economic Journal.Child; Children; Racial; Welfare; Well Being

Will Parent Training Reduce Abuse, Enhance Development, and Save Money? Let's Find Out

Outlines a strategy for testing the feasibility of community-developed parent training initiatives to prevent child abuse and neglect. Calls for a federal grant program to test community-wide implementation of parent training programs in stages

Supersymmetric Theory and Models

In these introductory lectures, we review the theoretical tools used in constructing supersymmetric field theories and their application to physical models. We first introduce the technology of two-component spinors, which is convenient for describing spin-$1/2$ fermions. After motivating why a theory of nature may be supersymmetric at the TeV energy scale, we show how supersymmetry (SUSY) arises as an extension of the Poincar\'e algebra of spacetime symmetries. We then obtain the representations of the SUSY algebra and discuss its simplest realization in the Wess-Zumino model. In order to have a systematic approach for obtaining supersymmetric Lagrangians, we introduce the formalism of superspace and superfields and recover the Wess-Zumino Lagrangian. These methods are then extended to encompass supersymmetric abelian and non-abelian gauge theories coupled to supermatter. Since supersymmetry is not an exact symmetry of nature, it must ultimately be broken. We discuss several mechanisms of SUSY-breaking (both spontaneous and explicit) and briefly survey various proposals for realizing SUSY-breaking in nature. Finally, we construct the the Minimal Supersymmetric extension of the Standard Model (MSSM), and consider the implications for the future of SUSY in particle physics.Comment: Lecture notes, TASI 2016. 144 pages, typographical errors correcte

Promoting Economic Mobility by Increasing Postsecondary Education

Explores policy options for expanding educational opportunities for low-income students to enhance upward economic mobility. Examines the effectiveness of student aid in promoting college completion and proposes a plan for better guidance and preparation

Additional Lake Bob Sandlin Sites with Documented Collections of Prehistoric Lithic and Ceramic Artifacts

This is the third in a series of publications that concern the documentation of prehistoric artifact-collections from sites found along the shoreline of Lake Bob Sandlin in the Big Cypress Creek basin of East Texas. These documentation efforts have demonstrated that sites at the lake have diverse temporal and spatial patterns, with an intensive Caddo occupation from the Middle (ca. A.D. 1200-1425) to Late Caddo (ca. A.D. 1430-1680) periods