Readily fiberizable glasses having a high modulus of elasticity

New glass compositions yield composites having higher moduli of elasticity and specific moduli of elasticity than commercially available glasses. Over a reasonable temperature range the glasses have a viscosity of about 20,000 poises. They consist of silica, alumina, magnesia, and beryllia, plus at least one uncommon oxide

High modulus invert analog glass compositions containing beryllia

Glass compositions having a Young's modulus of at least 15 million psi and a specific modulus of at least 110 million inches consisting essentially of, in mols, 10-45% SiO2, 2-15% Li2O, 3-34% BeO, 12-36% of at least one bivalent oxide selected from the group consisting of CaO, ZnO, MgO and CuO, 10-39% of at least one trivalent oxide selected from the group consisting of Al2O3, B2O3, La2O3, Y2O3 and the mixed rare earth oxides, the total number of said bivalent and trivalent oxides being at least three, and up to 10% of a tetravalent oxide selected from the group consisting of ZrO2, TiO2 and CeO2

High modulus rare earth and beryllium containing silicate glass compositions

Glass compositions having a Young's modulus of at least 16 million psi and a specific modulus of at least 110 million inches consisting essentially of approximately, by weight, 20 to 43% SiO2, 8 to 21% Al2O3, 4 to 10% BeO, 27 to 58% of at least one oxide selected from a first group consisting of Y2O3, La2O3, Nd2O3, Ce2O3, Ce2O3, and the mixed rare earth oxides, and 3 to 12% of at least one oxide selected from a second group consisting of MgO, ZrO2, ZnO and CaO are described. The molar ratio of BeO to the total content of the first group oxides is from 1.0 to 3.0

George F. Kennan’s strategy of Containment: an assessment of Kennan’s coherence and consistency

This thesis examines George F. Kennan’s coherence and consistency when he formulated the strategy of containment. Kennan’s work went through different stages which depended on the political context it was set in as circumstances evolved and the position he held. The aim is not to criticise Kennan but understand whether he remained consistent and coherent and why changes occurred. When Kennan sent the Long Telegram and delivered lectures at the National War College, the strategy had not been structured. In 1946 and early 1947, containment was not a strategy, it was still an idea. The Long Telegram provided him with the opportunity to move to the National War College to develop and structure a strategy. The invitation in 1947 to enter the official bureaucracy as the Director of the Policy Planning Staff did not demand that Kennan create a strategy but he was able to use it as an opportunity to build the strategy he had been advocating which was to contain Soviet expansion through the economic rehabilitation of Western Europe, Germany and Japan. Kennan remained consistent with his recommendations for a political-economic containment, specifically avoiding any military intervention. Kennan became trapped by the X article, as it distorted his views, making it appear that he was contradicting his original approach to containment. Kennan attempted to fight back against the misunderstanding of this article by focusing on political-economic policies, but it became clear that he was losing his influence and struggling to implement a coherent strategy. The extension of the containment strategy beyond strategic areas, the rejection of Program A, along with the continued division of Europe and the more militarized tone of the containment strategy stopped Kennan from implementing a coherent containment strategy. By 1953, Kennan and his containment strategy had been defeated

Investigation of the kinetics of crystallization of molten binary and ternary oxide systems Quarterly status report, 1 Jun. - 31 Aug. 1967

Crystallization kinetics of molten binary and ternary oxide system

Determining and analyzing the strength and impact resistance of high modulus glass

An error was noticed recently in the computer program used to reduce the laboratory sonic measurements to tabulated values of Young's modulus of the bulk samples of experimental glasses. Correction of this error gave revised values for the last fifty experimental glasses prepared in this laboratory. This corrected data, when examined as input material for the calculation of Young's modulus of bulk glasses from composition by the C. J. Phillips procedure, resulted in new values for the contribution per mol of several oxides. The new value for the zinc oxide molal factor is especially significant since it is slightly greater than the factor for beryllia for the types of glasses melted in the UARL research program. This discovery provides a new tool in the search for nontoxic, i.e. without beryllia, high modulus glass fibers particularly when coupled with recent measurements that showed zinc oxide contributes significantly to increased impact strength. New glass compositions prepared in this period and the latest impact strength values measured are also included

Investigation of the kinetics of crystallization of several high temperature glass systems Quarterly status report, 1 May - 31 Jun. 1970

Crystallization kinetics and impact tests of glass fiber-epoxy composite

Determining and analyzing the strength and impact of high modulus glass

Mechanical properties and impact strength of UARL 417 experimental glas

Investigation of the kinetics of crystallization of molten binary and ternary oxide systems Quarterly status report, 1 Dec. 1968 - 28 Feb. 1969

Kinetics of crystallization of molten binary and ternary oxide system

Investigation of the kinetics of crystallization of molten binary and ternary oxide systems Quarterly status report no. 1, 1 Sep. - 30 Nov. 1965

Crystallization kinetics of molten binary and ternary oxide system