Lead telluride non-magnetic bonding research study Second quarterly report, 1 Jun. - 31 Aug. 1965

Diffusion and braze bonding of tungsten and tantalum to lead telluride and lead telluride- tin telluride thermoelectric alloy

Do Agglomeration Economies Exist in the Hospital Services Industry

Given the importance of knowledge flows and the continued emphasis on face-to-face encounters especially for medical care, close proximity of hospitals may be essential for the efficient delivery of medical care. That is, hospital productivity might be greater where hospitals cluster and allow knowledge to more easily and quickly disperse among personnel in the various organizations. To add to the understanding about agglomeration economies in the hospital services sector, this study analyzes how the clustering of hospitals in the various metropolitan areas of the US affects industry wide productivity. The multiple regression analysis is conducted on a cross-sectional basis for both 1993 and 1999 and by using first differencing of the data between the two years. The observed productivity improvements resulting from the clustering of hospitals provides yet another justification for encouraging a larger number of hospitals in metropolitan areas.

Thermoelectric bonding study. the bonding of pbte and pbte-snte with non-magnetic electrodes

Low resistance, high strength, nonmagnetic electrode bonding to lead telluride and lead- telluride-tin telluride alloy

Leishmania manipulation of sand fly feeding behavior results in enhanced transmission.

In nature the prevalence of Leishmania infection in whole sand fly populations can be very low (<0.1%), even in areas of endemicity and high transmission. It has long since been assumed that the protozoan parasite Leishmania can manipulate the feeding behavior of its sand fly vector, thus enhancing transmission efficiency, but neither the way in which it does so nor the mechanisms behind such manipulation have been described. A key feature of parasite development in the sand fly gut is the secretion of a gel-like plug composed of filamentous proteophosphoglycan. Using both experimental and natural parasite-sand fly combinations we show that secretion of this gel is accompanied by differentiation of mammal-infective transmission stages. Further, Leishmania infection specifically causes an increase in vector biting persistence on mice (re-feeding after interruption) and also promotes feeding on multiple hosts. Both of these aspects of vector behavior were found to be finely tuned to the differentiation of parasite transmission stages in the sand fly gut. By experimentally accelerating the development rate of the parasites, we showed that Leishmania can optimize its transmission by inducing increased biting persistence only when infective stages are present. This crucial adaptive manipulation resulted in enhanced infection of experimental hosts. Thus, we demonstrate that behavioral manipulation of the infected vector provides a selective advantage to the parasite by significantly increasing transmission

Low cost solar array project 1: Silicon material

The low cost production of silicon by deposition of silicon from a hydrogen/chlorosilane mixture is described. Reactor design, reaction vessel support systems (physical support, power control and heaters, and temperature monitoring systems) and operation of the system are reviewed. Testing of four silicon deposition reactors is described, and test data and consequently derived data are given. An 18% conversion of trichlorosilane to silicon was achieved, but average conversion rates were lower than predicted due to incomplete removal of byproduct gases for recycling and silicon oxide/silicon polymer plugging of the gas outlet. Increasing the number of baffles inside the reaction vessel improved the conversion rate. Plans for further design and process improvements to correct the problems encountered are outlined

Lead telluride bonding and segmentation study Semiannual phase report, 1 Feb. - 31 Jul. 1969

Thermoelectric system of Cd-Si-Ge, and tungsten diffusion bonded lead tellurid

Experimental and bond graph based sensitivity calculations for micro-scale robust engineering design

Copyright @ 2005 IEEEBond graph modeling and sensitivity analysis are used to provide a platform for the robust design of a small mechatronic device, a behind-the-ear (BTE) hearing aid. Two key components of the device, namely the telecoil and the receiver, are considered. Experimental measurements, bond graph simulation models and analytic sensitivity analysis are used to investigate the interaction between these components in order to gain insight into the effect of component placement on the robustness of the final product

Lead telluride non-magnetic bonding research study Third quarterly report, Sep. 1 - Nov. 30, 1965

Diffusion bonding of tungsten electrodes to lead tellurium and lead tellurium-tin tellurium thermocouple