New exact solutions for power-law inflation Friedmann models

We consider the spatially flat Friedmann model. For a(t) = t^p, especially, if p is larger or equal to 1, this is called power-law inflation. For the Lagrangian L = R^m with p = - (m - 1)(2m - 1)/(m - 2), power-law inflation is an exact solution, as it is for Einstein gravity with a minimally coupled scalar field Phi in an exponential potential V(Phi) = exp(mu Phi) and also for the higher-dimensional Einstein equation with a special Kaluza-Klein ansatz. The synchronized coordinates are not adapted to allow a closed-form solution, so we use another gauge. Finally, special solutions for the closed and open Friedmann model are found.Comment: 9 pages, LaTeX, reprinted from Astron. Nachr. 311 (1990) 16

Using automated source code analysis for software evolution

Software maintenance is one of the most expensive and time-consuming phases in the software life-cycle. The size and complexity of commercial applications probably present the greatest difficulty that maintainers face when making changes to their applications. As a result of the corresponding loss of understanding, business knowledge encapsulated within the system becomes fragmented, and any changes made as a result of new business initiatives become difficult to implement and hence may mean a loss of business opportunities. This paper outlines an approach to regaining understanding of software which has been used in the Release project at Durham University. This approach involves determining the calling structure of a program in terms of a call-graph, and from this call-graph extracting a dominance tree. Various problems which have been encountered during the construction of tools to perform this task are described

Pollinators In Peril: A Systematic Status Review of North American and Hawaiian Native Bees

While the decline of European honeybees in the United States and beyond has been well publicized in recent years, the more than 4,000 species of native bees in North America and Hawaii have been much less documented. Although these native bees are not as well known as honeybees, they play a vital role in functioning ecosystems and also provide more than $3 billion dollars in fruit-pollination services each year just in the United States.For this first-of-its-kind analysis, the Center for Biological Diversity conducted a systematic review of the status of all 4,337 North American and Hawaiian native bees.For this report we assembled a list of all valid native bee species and their current conservation status as established by state, federal or independent researchers. We then conducted a comprehensive review of all literature on those species as well as records documenting their occurrence. From that research we identified those bees with sufficient data to assess their status, including current and historical range, behavioral observations and studies, arriving at the first comprehensive analysis of the status of North American and Hawaiian native bees.We also highlight five native solitary bee species that are seriously imperiled. These remarkable, underappreciated pollinators offer a snapshot of the threats driving the alarming declines in many native bee species — declines that must be reversed to save these irreplaceable native bees and the health of the ecosystems that depend on them

Health Care Doesn't Have to Cost an Arm and a Leg: 29 Reasons for Optimism from Comparisons between Countries and U.S. States

Residents of 29 countries live longer lives, on average, than Americans -- while spending up to eight times less on their health. A new report by American Human Development Project ranks the 50 states and Washington, D.C. against 80 countries in the world on life expectancy at birth, infant death rates, and annual per person spending on health care. The results powerfully demonstrate how better care and reining in costs are not incompatible

Building Stronger Nonprofits Through Better Financial Management, Executive Summary

This executive summary presents a summary of early lessons from The Wallace Foundation's four-year Strengthening Financial Management in Out-of-School Time initiative (SFM). SFM was designed to improve the financial management systems of 26 well-respected Chicago nonprofits that provide out-of-school-time services

Building Stronger Nonprofits Through Better Financial Management

The Wallace Foundation's four-year Strengthening Financial Management in Out-of-School Time initiative(SFM) was designed to improve the financial management systems of 26 well-respected Chicago nonprofits that provide out-of-school-time (OST) services. SFM grew out of the Foundation's longstanding commitment to improving the quality of services for youth during nonschool hours and the realization that even successful nonprofits face financial management challenges that have an impact on their ability to achieve their missions. To address these challenges, the initiative is working to reform public and private funding practices that strain OST organizations' financial management capacity and providing participating organizations with financial management training and peer networking opportunities (using one of two models that vary in intensity and in the balance of individual vs. group-based training and support)