UNT Libraries Government Documents Department - 30,080 Matching Results

Search Results

prev Results: 30073 - 30080
open access

Zintl cluster chemistry in the alkali-metal-gallium systems

Description: Previous research into the alkali-metal-gallium systems has revealed a large variety of networked gallium deltahedra. The clusters are analogues to borane clusters and follow the same electronic requirements of 2n+2 skeletal electrons for closo-deltahedra. This work has focused on compounds that do not follow the typical electron counting rules. The first isolated gallium cluster was found in Cs{sub 8}Ga{sub 11}. The geometry of the Ga{sub 11}{sup 7{minus}} unit is not deltahedral but can be de… more
Date: March 27, 1998
Creator: Henning, R.
Item Type: Refine your search to only Thesis or Dissertation
open access

Zircex Fluoride Volatility Combination

Description: In using the Zircex Process head-end to recover Zr from fuel elements before recovery of U by fluoride volatility, loss of U as UCl/sub 4/ is a problem. The suitability of using a Ni wire filter for trapping entrained UCl/sub 4/, and recovery of the trapped U by direct fluorination of filter and residue is investigated. It is recommended from these studies that water vapor and oxygen should be kept out of the reactor, and that the filter and filter material should be further investigated. (T.R.… more
Date: March 20, 1958
Creator: Ammann, P. R.; Madden, D. A. & Swift, D. L.
Item Type: Refine your search to only Report
open access

Zirconium-titanium phosphate acid catalysts synthesized by sol gel techniques

Description: Recently a large effort has been put into identifying solid acid materials, particularly sulfated zirconia and other sulfated metal oxides, that can be used to replace environmentally hazardous liquid acids in industrial processes. The authors are studying a group of mixed metal phosphates, some of which have also been sulfated, for their catalytic and morphological characteristics. Zirconium and titanium are the metals used in this study and the catalysts are synthesized from alkoxide starting… more
Date: March 1, 1998
Creator: Jackson, N. B.; Thoma, S. G.; Kohler, S. & Nenoff, T. M.
Item Type: Refine your search to only Article
open access

ZONE - a finite element mesh generator. [2-D, for CDC 7600]

Description: The ZONE computer program is a finite element mesh generator that produces the nodes and element description of any two-dimensional geometry. The geometry is subdivided into a mesh of quadrilateral and triangular zones arranged sequentially in an ordered march through the geometry. The order of march can be chosen so that the minimum bandwidth is obtained. The node points are defined in terms of the x and y coordinates in a global rectangular coordinate system. The zones generated are quadrilat… more
Date: March 12, 1980
Creator: Burger, M.J.
Item Type: Refine your search to only Report
open access

ZORNOC: a 1 1/2-D tokamak data analysis code for studying noncircular high beta plasmas

Description: A new tokamak data analysis code, ZORNOC, was developed to study noncircular, high beta plasmas in the Impurity Study Experiment (ISX-B). These plasmas exhibit significant flux surface shifts and elongation in both ohmically heated and beam-heated discharges. The MHD equilibrium flux surface geometry is determined by solving the Grad-Shafranov equation based on: (1) the shape of the outermost flux surface, deduced from the magnetic loop probes; (2) a pressure profile, deduced by means of Thomso… more
Date: March 1, 1980
Creator: Zurro, B.; Wieland, R. M.; Murakami, M. & Swain, D. W.
Item Type: Refine your search to only Report
open access

Zr and Mo isotopic constraints on the origins of unusual types of presolar SiC grains.

Description: Although most presolar silicon carbide grains form in asymptotic giant branch red giant stars (the so-called mainstream grains) or supernovae (the X-grains), there are a number of other minor types of grains whose origin is less clear. The dominant mechanisms of heavy element nucleosynthesis, the s-process and r-process, are thought to occur mainly in AGB stars and supernovae, respectively [1], and the isotopic patterns in heavy elements in presolar grains can be used to constrain their origins… more
Date: March 1, 2000
Creator: Pellin, M. J.; Davis, A. M.; Calaway, W. F.; Lewis, R. S.; Clayton, R. N. & Amari, S.
Item Type: Refine your search to only Article
Back to Top of Screen