No abstract

No abstract

Uranium-1" 1.6 2.3 1.5 Uranium-2C 2.5 2.5 2.2 Uranium Alloy-1d 33 31 30 33 Uranium Alloy-2d 32 28 28 27 Uranium Alloy-3d 2.3 2.0 2.4 2.0 Uranium Alloy-4d 3.0 2.9 2.4 2,2" Extraction temperature 1000 °C. 6 Each sample was cut from an adjacent position along a '/«-inch by 1/e-inch rod.c Uranium specimens were from different billets of high-purity derby uranium.d Uranium alloy specimens were from different batches of similar materials except uranium alloys 3 and 4 had been vacuumheat treated.Some hydrogen determinations for titanium, uranium, and uranium alloys were performed. Tables I and II demonstrate the precision of the instrument when used as a routine analytical device. During these analyses, the samples were de-greased in acetone, and the samples were allowed to accumulate in the furnace chamber until all eight samples were analyzed. Samples from a given specimen were analyzed on two different days in order to demonstrate the stability of the instrument. CONCLUSIONSThe instrument described in this article has been satisfactory for the determination of hydrogen in metals over the concentration range from 0.01 wppm to 100 wppm with a precision of 10%. Diffusion parameters, surface reactions, and the distribution of hydrogen in the sample can be evaluated using the hydrogen evolution rate data and the thermal history of the sample after it is dropped into the furnace.Micromole quantities of other gases can also be determined; thus, the instrument can be used to study a great variety of thermally activated gas evolution processes.

With exponential growth in in the U.S. utility photovoltaic market, high resolution solar irradiance data and appropriate spatial-temporal models are required to determine the true impact of solar power variability on the grid. This paper describes a new and economical Data Acquisition System (DAS) to collect high resolution solar power data required for high penetration PV integration studies and suggest model to simulate the plant-average irradiance time series given a single irradiance point sensor.

No abstract