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A ug 2 00 7 Detection of Neutron Sources in Cargo Containers
We investigate the problem of detecting the presence of clandestine neutron sources, such as would be produced by nuclear weapons containing plutonium, within cargo containers. Small, simple and economical semiconductor photodiode detectors affixed to the outsides of containers are capable of producing statistically robust detections of unshielded sources when their output is integrated over th...
متن کاملExpanding the Area of Gravitational Entropy
I describe how gravitational entropy is intimately connected with the concept of gravitational heat, expressed as the difference between the total and free energies of a given gravitational system. From this perspective one can compute these thermodyanmic quantities in settings that go considerably beyond Bekenstein’s original insight that the area of a black hole event horizon can be identifie...
متن کامل3D Database System of Mercede Church : The Use of 3D Models as an Interface to Information
Advancement in 3D modelling technologies has enabled us to obtain high resolution 3D models of real objects, for example historic buildings. Unfortunately, however, the application tools for large models have not been existed, which allow experts and other people outsides of the field of computer engineering to utilize the 3D models effectively. We introduce a GUI-based application tool enablin...
متن کاملChromium diffusion and reduction in soil aggregates.
The distribution of metal contaminants such as chromium in soils can be strongly localized by transport limitations and redox gradients within soil aggregates. Measurements of Cr(VI) diffusion and reduction to Cr(III) were obtained in soil columns representing transects into soil aggregates in order to quantify influences of organic carbon (OC) and redox potentials on Cr transport distances and...
متن کاملThe role of blood vessels, endothelial cells, and vascular pericytes in insulin secretion and peripheral insulin action.
The pathogenesis of type 2 diabetes is intimately intertwined with the vasculature. Insulin must efficiently enter the bloodstream from pancreatic beta-cells, circulate throughout the body, and efficiently exit the bloodstream to reach target tissues and mediate its effects. Defects in the vasculature of pancreatic islets can lead to diabetic phenotypes. Similarly, insulin resistance is accompa...
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