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81.
E. L. Charsley P. G. Laye G. M. B. Parkes J. J. Rooney 《Journal of Thermal Analysis and Calorimetry》2011,105(2):699-703
The development of a new sample controlled thermal analysis technique based on a heat flux DSC is described. The performance
of the system is demonstrated by studies on the decomposition of sodium bicarbonate and the oxidation of a copper impregnated
carbon. The ability of the technique to study reactions which take place without a change in mass is illustrated by the curing
of an epoxy resin with a polyaminoamide hardener. 相似文献
82.
83.
A mathematical model is proposed for the process of vacuum superplasticforming. The model exploits the fact that in most industrialapplications the sheet aspect ratio (thickness/sheet width)is small. After an initial consideration of some of the moregeneral properties and the literature of superplastic materials,the elastic/plastic deformation of an internally-inflated thin-walledcylinder is examined. Plates of arbitrary geometry are thenconsidered. A quasisteady model in which the sheet moves througha sequence of steady states is developed. Some simplified closed-formsolutions are examined, but for general cases a system of nonlinearpartial differential equations must be solved numerically. Anefficient and accurate semi-explicit numerical scheme is proposedand a simplified stability analysis is presented; the methodis then used to compute properties of superplastic vacuum mouldedsheets in a number of practically motivated cases. 相似文献
84.
85.
A sample of strontium nitrite has been synthesised and thermally characterised to investigate its role in the ageing of magnesium-strontium nitrate pyrotechnic compositions in the presence of water vapour. Studies by isothermal microcalorimetry show that the addition of strontium nitrite to a 50% magnesium-50% strontium nitrate composition eliminated the induction reaction normally observed in closed ampoule studies in air at 50 °C and relative humidities in the range 65-69%. 相似文献
86.
The hydrogenolysis of neopentyl iodide on reduced Co or Pt dispersed on MgO support yields increasing amounts of 2-metylbutane and 2-methylbutenes in addition to neopentane, as the temperature is raised from 50 to 150°C. These results support the idea that a π-complexed half-reaction state is simultaneously involved in activation of the R---I bond and in the evident 1,2-methyl shift. This π-complex mechanism is the same as that first suggested almost a quarter of a century ago for neopentane isomerism during hydrogenolysis at 200°C on Pt catalysts. The present results also support the contention that similar π-complexes are responsible for analogous carbon skeleton rearrangement reactions mediated by coenzyme B12. 相似文献
87.
Eva Eichler Clarence Stanley Rooney Haydn Windsor Richard Williams 《Journal of heterocyclic chemistry》1976,13(1):41-42
The synthesis of some 2-amino-1,8-naphthyridine derivatives substituted in the 5- and/or 7-positions with trifluoromethyl is described along with their conversions to the corresponding 1,8-naphthyridin-2(1H)ones. A modified procedure for oxidizing electron-deficient heterocyclic compounds to their N-oxides is presented. 相似文献
88.
J. Rokach Y. Girard J. G. Atkinson C. S. Rooney 《Journal of heterocyclic chemistry》1979,16(1):205-207
The photochemical reaction of 1 with acrylonitrile gave the cyclobutane adducts II and III, which on treatment with base afforded a novel polycyclic structure IV. Reduction of IV with LAH followed by Eschweiler-Clarke methylation yielded the polyheterocyclic structure VI. 相似文献
89.
90.
C. H. Herty Jr. J. M. Gaines Jr. H. Freeman M. W. Lightner F. Meissner P. Goerens N. Tschischewski J. Paquet P. Oberhoffer A. Beutell O. v. Keil E. Piwowarsky P. Klinger W. Hessenbruch T. E. Rooney G. Barr H. Diergarten H. C. Vacher L. Jordan J. R. Eckman M. Shepherd und P. G. Ledig 《Fresenius' Journal of Analytical Chemistry》1933,92(5-6):200-214
Ohne Zusammenfassung 相似文献