共查询到20条相似文献,搜索用时 31 毫秒
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Z. Olesiak 《热应力杂志》2013,36(3-4):501-508
A method is presented that enables thermal crack and contact problems to be reduced in a simple way to those of the isothermal case and pertinent solutions to be obtained. The method is valid for elastic space or semispace and for a layer that is isotropic or transversally isotropic. Illustrative examples are given for axially symmetric cases. 相似文献
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选用常见废生物质木屑为原料,以分步离子交换法制备的Ni、Fe金属改性分子筛为液化催化剂,在高温高压反应釜中进行水热法催化液化的实验研究.运用扫描电镜(SEM)和X射线衍射(XRD)对催化剂的性质进行表征,重点考察催化剂对生物质液化行为的影响.在280℃、10min条件下的实验结果表明催化剂能有效促进生物质的低温水热法液化,以NiHZSM-5为催化剂可使木屑催化液化的总产率由20.69%提高到31.36%,且增加的产量中有机水溶物占93.92%,说明NiHZSM-5催化剂可以选择性催化液化生物质. 相似文献
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讨论了一种新型管的管簇结构腔体式吸收器,基于网络法建立了确定各种热流的控制方程及总热阻并给出集热器及各主要部件的效率定义式,最后对热性能进行了详细的数值分析。 相似文献
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M. ZH. Svanadze 《热应力杂志》2013,36(7):633-648
By means of elementary functions, the fundamental solution of equations of the thermoelasticity of the steady oscillations for a mixture of two elastic solids is constructed, and basic properties are established. 相似文献
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C. M. Dafermos 《热应力杂志》2013,36(1):127-134
It is shown that the second law of thermodynamics induces uniqueness and continuous dependence upon initial-state and supply terms of smooth thermodynamic processes of thermoelastic fluids within the broader class of thermodynamic processes with shock waves. 相似文献
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采用真空蒸发的方法制备出玻璃衬底ITO/TPD/Alq/A1结构的有机发光器件(OLED)。改变有机层的厚度, 比较不同厚度下OLED的各项性能的差异,包括工作电压,发光效率。实验发现无论增大空穴传输层TPD的厚度 抑或是发光层Alq的厚度都会增大器件的工作电压。发光层Alq厚度的增大还能引起发光效率的增大,而TPD厚 度的增大对发光效率的影响则是复杂的。对于上述现象用隧穿理论以及直带模型进行了解释。对制备高亮度, 高效率低损耗的OLED具有指导意义。 相似文献
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Merab Svanadze 《热应力杂志》2013,36(2):151-170
By means of elementary functions, the fundamental solutions of the equations of the equlibrium and steady oscillations of the theory of thermoelasticity with microtemperatures are constructed, and basic properties are established. 相似文献
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运用热重-傅立叶红外光谱联用技术(TG-FTIR),以麦秸为对象,探讨催化与非催化条件下生物质的加压热解特性,分析研究热解压力、温度、催化剂种类对生物质热解主要析出产物的影响。通过热重TG和DTG曲线,获得相关热解特性参数及动力学参数,结果表明添加NiO和CaO的加压催化热解均促进麦秸热解反应进行,降低表观活化能,其中NiO对提高热解析出产率作用更显著。通过红外光谱对热解产物的分析表明,提高热解压力以及加入适当的催化剂NiO和CaO均有利于增加CO和CH_4的生成。而且热解压力增加提高了NiO和CaO的催化作用,其中添加NiO时,在800℃以上具有更好的催化作用,且提高压力更有利于促进CH_4的生成;而添加CaO时,提高热解压力有利于减少CO_2的生成。 相似文献
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生物质气化焦油催化裂解特性 总被引:17,自引:5,他引:17
以白云石为载体制备的Ni基催化剂对松木粉在700℃下气化产生的焦油进行了催化裂解实验研究,并与重油裂解催化剂进行了对比。结果表明:石油化工重油裂解催化剂对生物质气化焦油具有一定的催化裂解作用;Ni的掺入方式和催化剂的煅烧温度对催化剂的性能具有显著的影响。以100~120目白云石粉为载体,900℃下煅烧的Ni基催化剂在700℃(2下焦油裂解对H2和CH4具有很好的选择性(H2为78.3%,H2 CO为92.3%,CH4为2.3%);100h老化实验显示H2/CO随催化剂活性降低而逐渐减小。 相似文献
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对风力机系统的动态稳定性问题,即风力机侧振与叶轮摆轮的耦合运动,以及由叶片静不平衡引起的响应问题进行了研究。 相似文献
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介绍了在室外用两台标准总日射表和两台黑体校准过的地球辐射表提供净全福照度、日间检定净全辐射表的全波灵敏度和谙检定其长波灵敏度的结果。数据再次证明,两者之间存在明显差异,必须加以区分并分别予以校准。使用中,当净 辐照度为正时用以灵敏度,为我时用长小波灵敏度。分析表明,短波灵敏度并无实用价值。 相似文献
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Computational fluid dynamics (CFD) was used for predicting k-factors (pressure loss coefficients) for rectangular and flat-oval duct elbows. Prediction results were compared with experimental data from the literature and found to be in good agreement. The difference in the k-factor between a flat-oval elbow and a rectangular elbow is small, given the same cross-sectional area. The elbow k-factor is shown to decrease with increasing duct aspect ratio. © 1997 by John Wiley & Sons, Ltd. 相似文献
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This paper describes an investigation of the photothermoelasticity measurement technique by means of heating. The physical and optical properties of epoxy resin (Araldite B) were investigated over a temperature range of 20-60°C The technique and equipment developed to measure the thermal-stress and temperature distributions in a semi-infinite plate of epoxy resin demonstrate that excellent results can be obtained within a temperature range from room temperature to 60°C. The heating method was also used to measure the transient thermal stresses in semi-infinite plates having circular and arc-shaped notches. 相似文献
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Yahya H. Khraisha 《国际能源研究杂志》1997,21(3):201-207
The kinetics of chloroform extraction from a Jordan tar sand have been studied. The activation energy of the extraction has been evaluated; for 125–180 μm tar sand it is 6⋅53 kJ mol−1 in the initial stage of extraction and 12⋅18 kJ mol−1 in the later stages, for 355–500 μm 1⋅0 kJ mol−1 and 10⋅61 kJ mol−1, respectively. These values are in agreement with the general activation energy of the dissolution of a solid material. It is concluded that the rate of extraction is controlled by the diffusion of extract. © 1997 by John Wiley & Sons, Ltd. 相似文献