Evaluation of solar cells and arrays for potential solar power satellite applications

Proposed solar array designs and manufacturing methods are evaluated to identify options which show the greatest promise of leading up to the develpment of a cost-effective SPS solar cell array design. The key program elements which have to be accomplished as part of an SPS solar cell array development program are defined. The issues focussed on are: (1) definition of one or more designs of a candidate SPS solar array module, using results from current system studies; (2) development of the necessary manufacturing requirements for the candidate SPS solar cell arrays and an assessment of the market size, timing, and industry infrastructure needed to produce the arrays for the SPS program; (3) evaluation of current DOE, NASA and DOD photovoltaic programs to determine the impacts of recent advances in solar cell materials, array designs and manufacturing technology on the candidate SPS solar cell arrays; and (4) definition of key program elements for the development of the most promising solar cell arrays for the SPS program

The Willis-Harrington Commission: The Politics of Education Reform

The 1980s have witnessed a nationwide movement to upgrade public education, including reform efforts in the New England states. Massachusetts periodically has grappled with the challenge of improving its schools. During the 1960s, the Massachusetts legislature authorized a thorough examination of education in the state. This mandate was carried out by a blue-ribbon panel that came to be known popularly as the Willis-Harrington Commission. In 1965, the commission issued a 624-page final report that included findings and recommendations relating to many aspects of public education in the state. This article chronicles the history of Willis-Harrington and discusses the problems that thwarted implementation of many ofthe wide-ranging changes it envisioned

The Impact of School Spending on Student Achievement: Results of MEAP Statewide Tests

Examining school spending and student achievement as measured by the Massachusetts Educational Assessment Program tests on a community-by-community basis indicates that high spending in and of itself does not ensure achievement. While every community must have adequate funding to deliver an acceptable level of education services, there is a wide variation in achievement in similar communities with similar spending. The data suggest that other factors influence outcomes at least as much as spending

Wallerian degeneration: gaining perspective on inflammatory events after peripheral nerve injury

In this review, we first provide a brief historical perspective, discussing how peripheral nerve injury (PNI) may have caused World War I. We then consider the initiation, progression, and resolution of the cellular inflammatory response after PNI, before comparing the PNI inflammatory response with that induced by spinal cord injury (SCI)