Structure and Evolution of Low-Mass Stars: An Overview and Some Open Problems

A review is presented of some of the ingredients, assumptions and techniques that are used in the computation of the structure and evolution of low-mass stars. Emphasis is placed on several ingredients which are still subject to considerable uncertainty. An overview of the evolution of low-mass stars is also presented, from the cloud collapse phase all the way to the white dwarf cooling curve.Comment: 52 pages, 6 figures. Invited review, to appear in "XIth Special Courses at the National Observatory of Rio de Janeiro" (AIP Conf. Proc.), ed. J. Alcaniz, R. de la Reza, F. Roig, & D. F. Lope

Dark Matter and Galaxy Formation

The four lectures that I gave in the XIII Ciclo de Cursos Especiais at the National Observatory of Brazil in Rio in October 2008 were (1) a brief history of dark matter and structure formation in a LambdaCDM universe; (2) challenges to LambdaCDM on small scales: satellites, cusps, and disks; (3) data on galaxy evolution and clustering compared with simulations; and (4) semi-analytic models. These lectures, themselves summaries of much work by many people, are summarized here briefly.Comment: 37 pages, 20 figures, Lectures at XIII Special Courses at Observatorio Nacional, Rio de Janeiro, Brazil, October 2008. To appear in the Proceeding

Corporate boards, ownership structure and firm performance in an environment of severe political and economic crisis

This study examines the relationship between board and ownership structures and firm performance in an environment of severe political and economic crisis. Using panel data from the Zimbabwe Stock Exchange (ZSE) for the period 2000-2005, we split the period into prepresidential election period (2000-2002) (a relatively stable political and economic period) and post-presidential election period (2003-2005) (a hostile political and economic period) to capture the differences in the political and economic landscape. We find that board size, ownership concentration and executive directors’ share ownership increased whilst the proportion of nonexecutive directors reduced in the post-presidential election period. Employing a system Generalized Method of Moments (GMM) approach, we find that performance is positively related to board size and ownership concentration in the post- (but not in the pre-) presidential election period. The results also show that performance is negatively related to executive directors’ share ownership in the post-presidential election period, but positively related in the pre-presidential election period. The proportion of non-executive directors is negative and significant in both periods. These findings support the notion that the effects of board and ownership structures depend on the nature of the firm’s environment, and therefore have important implications for policy-makers

Altered cell cycle regulation helps stem-like carcinoma cells resist apoptosis

Reemergence of carcinomas following chemotherapy and/or radiotherapy is not well understood, but a recent study in BMC Cancer suggests that resistance to apoptosis resulting from altered cell cycle regulation is crucial

Criminal Justice in the 21st Century: Allegheny County Jail

Criminal Justice in the 21st Century: Allegheny County Jail looks into the history, purposes, and structure of the Allegheny County Jail. This report outlines national and local data trends within jails and discusses the historic and current purposes of jails. It also highlights innovative programs and challenges within the county’s jail and potential best practices to address them

Criminal Justice in the 21st Century: Allegheny County Pretrial Decisions

Criminal Justice in the 21st Century: Allegheny County Pretrial Decisions examines the pretrial procedures and decisions made within the county criminal justice system. The report examines how pretrial decisions are made and national standards for pretrial services. The report highlights innovative practices occurring within the county and key local data. It also outlines national best practices in pretrial decisions

Criminal Justice in the 21st Century: Allegheny County Prosecution and Defense

Criminal Justice in the 21st Century: Allegheny County Prosecution and Defense examines the roles of prosecution and defense nationally and within the county including the offices of the district attorney and public defender. The report looks at key local data and opportunities within criminal court procedures to reduce the county jail population and the number of people under correctional control. The report highlights innovation national best practices in the area of prosecution and defense

Criminal Justice in the 21st Century: Allegheny County Courts and Probation

Criminal Justice in the 21st Century: Allegheny County Courts and Probation examines the structure, responsibilities, successes, and opportunities within Allegheny County's courts and probation department. The report highlights initiatives and innovations implemented by the Fifth Judicial District’s Criminal Division and key local data indicators. It also identifies current challenges within the county’s court and probation system and potential national best practices to address these challenges