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71.
The deformation mechanisms in a wide temperature rnage from room temperature to 1200K were investigated by thermal activation approach.Using observed instantaneous stress response to the strain rate jump (Δσtr),the activation volume Vs,then the activation enthalpy ΔH,activation free enthalpy ΔG and activation entropy ΔS were calculated.The apparent activation energy of high temperature deformation is estimated to be 3.66eV,which is larger than the self-diffusion coefficient of binary TiAl(3.01eV).The dislocations at 1173K are generally curved or bowed,even helical-shaped dislocations.The climb of ordinary dislocations as well as twinning has grealty contributed to the plastic deformation.The CRSS at 1173K is estimated to be 180MPa.The higher resisting stress at both room temperature and elevated temperature might relate to the high Nb content of the alloy. 相似文献
72.
73.
The relative reactivities of the lower alkanes in hydrogenolysis on a Pt/Al2O3 catalyst depend on the H2 pressure used, as do those of a Ru/Al2O3 catalyst, pretreated in various ways, for propane hydrogenolysis. Apparent activation energies also vary with H2 pressure. No single rate measurement adequately represents catalytic activity, which is properly defined as the rateconstant for the slow step. 相似文献
74.
A programmed temperature technique has been developed for the measurement of the self-diffusion coefficients of additives in polymers. This has been applied to the diffusion of three dialkylphthalate plasticizers in poly(vinyl chloride). Values of the self-diffusion coefficients and the calculated activation energies obtained in this way have been compared with values previously obtained from measurements at constant temperature. It has been shown that the programmed temperature technique gives a very rapid method for the estimation of the activation energy of self-diffusion. 相似文献
75.
不同活化剂对石油焦基活性炭孔结构的影响 总被引:4,自引:1,他引:4
以石油焦为原料 ,Na OH,KOH和 Na2 CO3 为活化剂制备活性炭 ,采用氮气吸附考察了不同活化剂对活性炭的比表面积、中孔和微孔孔径分布、孔容积及平均孔径等孔结构的影响 .结果表明 :KOH活化制备的活性炭包含 1 nm的微孔和 4nm的中孔 ,总孔容 0 .648cm3 /g,比表面积大 ;Na OH制备的活性炭以 1 nm的微孔为主 ,占总孔容 ( 0 .1 65 cm3 /g)的 98% ,平均孔径 1 .83nm;Na2 CO3 制备的活性炭以 4nm的中孔为主 ,占总孔容 ( 0 .1 43cm3 /g)的 68.5 % ,平均孔径 3.42 nm,比表面积小 .3种样品的孔径都呈现出多峰分布特征 .KOH和 Na2 CO3 活化制备的活性炭的 N2 吸附脱附曲线属于 型 ,Na OH活化制备的活性炭吸附脱附曲线属于 型 . 相似文献
76.
The oxidation of carbon nanotubes, C60 and graphite was studied by thermogravimetric (TG) analysis and differential thermal analysis (DTA) technique, and the oxidation kinetic models of three carbon materials studied were analyzed by mechanism-function method. The results indicate that three carbon species adopt different oxidation mechanisms due to their different structures. The oxidation of carbon nanotubes with cylindrical structure follows contracting volume reaction mechanism [R3 mechanism, 1-(1-α)1/3 = kt], indicating that the oxidation of carbon nanotubes takes place from the ends to the center. For graphite with planar sandwich structure, the oxidation starts at the edges initially and gradually moves toward the center, which corresponds to contracting area phase boundary reaction mechanism [R2 mechanism, 1-(1-α)1/2 = kt]. The oxidation of C60 with spherical structure, however, is complex and apparently cannot be illustrated with a single kinetic model. The values of apparent activation energy 相似文献
77.
The dynamic adsorption behaviors of benzene vapor on phosphoric acid‐activated carbon fiber (ACF‐P) were investigated by gas chromatography. The experimental results showed that ACF‐P that was activated at >350°C, like steam‐activated carbon fiber (ACF‐W), has good dynamic adsorption properties for benzene vapor. However, the saturation adsorption capacities of ACF‐P and ACF‐W are different. The dynamic adsorption conditions apparently do not affect the effluent concentration before the breakthrough point, but do change the operation loading and usage efficiency. The adsorbed ACF‐P can be regenerated, and good dynamic adsorbability can be recovered by heating treatment. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1841–1847, 2002 相似文献
78.
光催化剂SrTiO3的制备及其性能的研究 总被引:7,自引:0,他引:7
论述用化学液相共沉淀法制备SrTiO_3的最佳条件,及在不同的活化条件下对SrTiO_3光催化性能的影响。此外还研究了掺入过渡金属氧化物对SrTiO_3催化性能的改善。 相似文献
79.
中药降香对酪氨酸酶激活作用的动力学研究 总被引:2,自引:0,他引:2
酪氨酸酶是生物合成黑素的主要酶。降香有促进酪氨酸酶活性的作用。通过对中药降香的水提取液和乙醇提取液促进酪氨酸酶活性作用的观察研究及降香提高酪氨酸酶活性的动力学观察研究,得到Lineweaver-Burk曲线、动力学回归方程及米氏常数Km值。为研究中药有效成分激活黑素细胞的机理奠定了基础。 相似文献
80.