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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 81 to 90 of 525 (0.018 seconds)| 81 |
Studies in the system CaO-Al2O3-SiO2-Fe-O2Sorrentino, Francois Paul January 1975 (has links)
No description available.
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| 82 |
Crystal structures of some decaborane derivativesOwen, J. D. January 1971 (has links)
No description available.
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| 83 |
Karle-Haupt man determint ants and the crystallographic phase problemGifkins, Michael Raymond January 1972 (has links)
No description available.
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| 84 |
Crystallographic studies of some cycloamylose complexesMacLennan, John M. January 1978 (has links)
Cycloheptaamylose (CHA) and p-nitroacetanilide (PNA) were co-crystallised to form the 1:1 complex (CHAPNA). Crystals of this complex were examined using X-ray diffraction. The cell dimensions are a = 15.20 A b = 15.67 A, c = 15.70 A, alpha = 87.69, beta = 98.115, gamma = 103.18 with Z = 2 and the space group is P1. 5500 unique reflections were measured from Weissenberg photographs. The structure was solved by the trial and error rotation and translation of a model of the structure in the position and orientation that had been indicated by the Patterson map. Inspection of the difference Fourier map after initial refinement located both PNA molecules. The structure was further refined using blocked matrix refinement to an R-factor of 0.132 for all the data. The PNA molecule is included in the cavity. The CHA molecules are hydrogen bonded together to form a dimer which has approximately twofold symmetry. Attempts were made to solve both the CHA complex with water using trial and error methods and the CHA iodine complex using Patterson maps to locate the iodine and then conventional heavy atom techniques. Preliminary crystallographic investigations of the CHA complexes with p-bromoacetanilide, which was isomorphous with CHAPNA, and m-nitroacetanilide are reported. Structural data for CHA complexes were reviewed, and a new classification scheme for these complexes was proposed. The binding between the guest and the host molecule was examined, and a modified torsion angle index (MTAI) was defined to simplify the analysis of the distortion of the CHA molecule.
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| 85 |
Investigations of the convergence of optimization proceduresFernandes, Edite M. G. P. January 1979 (has links)
No description available.
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| 86 |
Crystal structure studies by X-ray and neutron diffractionDunlop, Robert Smith January 1973 (has links)
No description available.
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| 87 |
Two topics in crystal physics. I. Energy levels of ions in crystals II. Scattering of high energy particles in crystalsEarney, James Joseph January 1970 (has links)
No description available.
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| 88 |
The crystal structures and thermal decompositions of trihydrazinotriazine and biureaRussell, Paul R. January 1976 (has links)
Trihydrazinotriazine (THT) and biurea are both used industrially as blowing agents for expanding certain types of polymers. The term 'blowing agent' is applied to any substance which can produce pores or cells in a polymeric material. There are two classes of blowing agent, physical and chemical. Physical blowing agents depend on a change of state of the substance to produce the cells e.g. the expansion of a compressed gas or evaporation of a liquid. Chemical. blowing agents depend on the evolution of gases by thermal decomposition to produce the. cells. It is to this latter class that THT and biurea belong.
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| 89 |
The crystal structure of some molecular compounds and related substancesHolmes, D. R. January 1952 (has links)
No description available.
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| 90 |
Some aspects of electron diffraction by gasesBowen, H. J. M. January 1953 (has links)
No description available.
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