Advanced electrical power, distribution and control for the Space Transportation System

High frequency power distribution and management is a technology ready state of development. As such, a system employs the fewest power conversion steps, and employs zero current switching for those steps. It results in the most efficiency, and lowest total parts system count when equivalent systems are compared. The operating voltage and frequency are application specific trade off parameters. However, a 20 kHz Hertz system is suitable for wide range systems

Advanced power systems for EOS

The Earth Observing System, which is part of the International Mission to Planet Earth, is NASA's main contribution to the Global Change Research Program. Five large platforms are to be launched into polar orbit: two by NASA, two by the European Space Agency, and one by the Japanese. In such an orbit the radiation resistance of indium phosphide solar cells combined with the potential of utilizing 5 micron cell structures yields an increase of 10 percent in the payload capability. If further combined with the Advanced Photovoltaic Solar Array, the total additional payload capability approaches 12 percent

Contributions to the Immunology and Serology of Schistosomiasis

Paper by Irving G. Kagan from the Communicable Disease Center, Public Health Center, Department of Health Education and Welfare, Atlanta, Georgi

Perinatal Loss

Dramatic improvements in the hospital management of perinatal loss have taken place in the past 20 years. However, there has been no critical examination of current approaches. Four possible hazards of current hospital practice are described: 1) Institutionalization of bereavement: Instead of offering parents an empathic awareness of the unique dimensions of their perinatal loss, caregivers often interact according to detailed behavioral protocols. 2) Idealization of contact with the dead baby: This approach may equate actual physical contact with the dead child with the more complicated and variable process of mourning. 3) Homogenization of grief: Counselors tend to denigrate different grief responses by focusing on a preconceived grief reaction. Thus, they may mistakenly label many such reactions pathologic if they deviate from the rigidly prescribed "norm." 4) Lecturing the bereaved: Telling parents the "right" thing to do may deprive them of a crucial aspect of the process that empowers parents after they experience the helplessness associated with perinatal loss — that of making their own decisions. These problems are illustrated by a clinical vignette, and alternative approaches are explored.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67970/2/10.1177_000992289203100611.pd