Dual latching solenoid valve Patent

Valve assembly for controlling simultaneously more than one fluid flow, and having stable qualities under load

Review of \u3cem\u3ePolitics and Partnerships: The Role of Voluntary Associations in America\u27s Political Past and Present.\u3c/em\u3e Elisabeth Clemens & Doug Guthrie (Eds.). Reviewed by John G. McNutt.

Book review of Elisabeth Clemens and Doug Guthrie, Eds. (2010). Politics and Partnerships: The Role of Voluntary Associations in America\u27s Political Past and Present. Chicago: University of Chicago Press, $55.00 (hardcover),$19 (paperback)

Review of \u3cem\u3eThe Quest for Environmental Justice: Human Rights and the Politics of Pollution.\u3c/em\u3e Robert D. Bullard (Ed.). Reviewed by John G. McNutt.

Book review of Robert Bullard (Ed.), The Quest for Environmental Justice: Human Rights and the Politics of Pollution. San Francisco, CA: Sierra Club Books, 2005. $18.95 papercover

Report of the panel on lithospheric structure and evolution, section 3

The panel concluded that NASA can contribute to developing a refined understanding of the compositional, structural, and thermal differences between continental and oceanic lithosphere through a vigorous program in solid Earth science with the following objectives: determine the most fundamental geophysical property of the planet; determine the global gravity field to an accuracy of a few milliGals at wavelengths of 100 km or less; determine the global lithospheric magnetic field to a few nanoTeslas at a wavelength of 100 km; determine how the lithosphere has evolved to its present state via acquiring geologic remote sensing data over all the continents

Damage Analysis Modified TRAC Computer Program (DAMTRAC)

A computer program tailored for EMP damage analysis of solid-state circuitry has been developed by modifying the existing TRAC network analysis program. Modification of the TRAC diode and transistor models to include breakdown parameters and the addition of a semiconductor device parameter library have greatly simplified the analyst\u27s task. An added feature is a subroutine that automatically calculates the amplitude and duration of transient power dissipated in electronic circuit components

Additive opportunistic capture explains group hunting benefits in African wild dogs

African wild dogs (Lycaon pictus) are described as highly collaborative endurance pursuit hunters based on observations derived primarily from the grass plains of East Africa. However, the remaining population of this endangered species mainly occupies mixed woodland savannah where hunting strategies appear to differ from those previously described. We used high-resolution GPS and inertial technology to record fine-scale movement of all members of a single pack of six adult African wild dogs in northern Botswana. The dogs used multiple short-distance hunting attempts with a low individual kill rate (15.5%), but high group feeding rate due to the sharing of prey. Use of high-level cooperative chase strategies (coordination and collaboration) was not recorded. In the mixed woodland habitats typical of their current range, simultaneous, opportunistic, short-distance chasing by dogs pursuing multiple prey (rather than long collaborative pursuits of single prey by multiple individuals) could be the key to their relative success in these habitats

Higher dimensional VSI spacetimes

We present the explicit metric forms for higher dimensional vanishing scalar invariant (VSI) Lorentzian spacetimes. We note that all of the VSI spacetimes belong to the higher dimensional Kundt class. We determine all of the VSI spacetimes which admit a covariantly constant null vector, and we note that in general in higher dimensions these spacetimes are of Ricci type III and Weyl type III. The Ricci type N subclass is related to the chiral null models and includes the relativistic gyratons and the higher dimensional pp-wave spacetimes. The spacetimes under investigation are of particular interest since they are solutions of supergravity or superstring theory.Comment: 14 pages, changes in second paragraph of the discussio