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排序方式: 共有2625条查询结果,搜索用时 15 毫秒
41.
对ZIRLO合金在360℃,18.6 MPa,含LiOH和H3BO3溶液的高温高压釜中进行了水侧腐蚀实验;并通过在其中的一个高压釜中加入乙酸锌,从而对比研究了加Zn对ZIRLO合金耐腐蚀性能的影响。结果表明:在腐蚀介质溶液中添加50μg/kg乙酸锌对ZIRLO合金的腐蚀增重情况、氧化膜厚度、氧化膜中第二相种类及大小、氧化膜表层元素的种类、分布及价态并无显著影响,但降低了氧化膜表层沉积物中Fe的含量,并抑制了国产新锆合金腐蚀过程中的吸氢。 相似文献
42.
43.
Sn-9Zn无铅钎料合金的压蠕变行为研究 总被引:1,自引:0,他引:1
试验研究了Sn-9Zn合金钎料在温度为40~100℃和压力为9.3~18.6MPa范围内的压蠕变行为。结果表明:随温度和应力的升高,合金的压蠕变量增大,稳态蠕变速率的对数分别与应力对数和温度呈较好的线性关系,稳态蠕变速率符合半经验公式。在不同的温度下,应力指数n相近,平均值为5.74;不同的应力下,表观激活能Qa相差不大,平均值为51.95kJ/mol,材料结构常数为0.03,压蠕变变形是位错滑移和位错攀移共同作用的结果,控制稳态蠕变速率的主要因素为位错管道扩散过程控制下的位错攀移。 相似文献
44.
液态模锻工艺参数对锌合金性能影响的研究 总被引:11,自引:2,他引:11
采用模拟实验法的实验数据。探讨了液态模锻工艺参数对锌合金性能的影响。在此基础上,给出了锌合金液态模锻工艺参数的取值范围,从而为该工艺的研究、开发和应用奠定了理论和实践基础。 相似文献
45.
The Cd−Zn system has been thermodynamically reassessed with the CALPHAD method by combining more recent experimental data,
in particular the activities of zinc in the liquid phase. A good agreement is obtained between the calculated and experimental
thermodynamic parameters as well asphase boundaries. 相似文献
46.
Takako Takasu Noritaka Ishihara Masashi Oota Yoshimi Ishiguro Yoichi Kurosawa Koji Dairiki Shunpei Yamazaki 《Journal of the Society for Information Display》2015,23(12):593-599
We have reported that the transistors having the c‐axis‐aligned crystalline (CAAC) In‐Ga‐Zn oxide (IGZO) show good performance. Recently, In‐Sn‐Zn Oxide (ITZO) has attracted much attention because of its high electron mobility, as well as IGZO. However, it has been reported that ITZO field effect transistors (FET) tend to have positive Vth (normally‐on characteristics) and poor reliability compared with IGZO‐FETs. We have reported that high‐performance and high‐reliability OS‐FETs can be fabricated by using CAAC‐IGZO, which has high crystallinity and has no clear grain boundaries, as an active layer. Therefore, we have fabricated CAAC‐ITZO thin films to improve performance of ITZO‐FETs by using CAAC‐ITZO as an active layer. In addition, FETs employing CAAC‐ITZO have better characteristics and reliability than FETs using nano‐crystal ITZO. Furthermore, constant photocurrent method (CPM) measurement was carried out in order to estimate density of deep‐level defect states caused by oxygen vacancies in oxide semiconductors. The results show that CAAC‐ITZO has lower density of deep‐level defect states than nano‐crystal ITZO. We attribute the improvement in reliability of ITZO‐FETs to a decrease in deep‐level defect states of an ITZO active layer, as is the case with IGZO. 相似文献
47.
Diffusional mobility for fcc phase of the Al–Mg and Al–Mg–Zn systems was critically assessed by using the DICTRA software (Diffusion Controlled Transformation). Good agreement was obtained from comprehensive comparisons between the calculated and experimental diffusion coefficients. The developed mobility database enables reasonable prediction of diffusion and solidification behaviours resulting from interdiffusion, such as concentration profile of diffusion couples and solidification curve of the Al–Mg alloys. 相似文献
48.
Jia X Gan C Xiao K He W Zhang T Huang C Wu X Luo G Wang X Hu J Tan J Zhang X Larsen PM Wu J 《Proteomics. Clinical applications》2009,3(6):694-704
Acute allograft rejection has been recognized as a major impediment to improved success in renal transplantation. Timely detection and control of rejection are very important for the improvement in long-term renal allograft survival. Thus, biomarkers for early diagnosis of acute rejection are required urgently to clinical medication. This study seeks to search for such biomarker candidates by comparing patients' pre-treatment urinary protein profiling with their post-treatment urinary protein profiling. A total of 15 significantly and consistently down-regulated protein candidates were identified. Among them, alpha-1-antichymotrypsin precursor (AACT), tumor rejection antigen gp96 (GP96) and Zn-Alpha-2-Glycoprotein (ZAG) were selected for further analysis. The results indicated that Western Blot assay of AACT, GP96 and ZAG had advanced the diagnosis time of acute renal rejection by 3 days, compared with current standard clinical observation and laboratory examination. Furthermore, the double-blind detection revealed that the accuracy, sensitivity and specificity of the diagnosis of acute renal rejection of AACT, GP96 and ZAG were 66.67%/100%/60%, 83.33%/100%/80% and 66.67%/100%/60%, respectively, and 100%/100%/100% in combination. In conclusion, urinary protein AACT, GP96 and ZAG could be a set of potential biomarkers for early non-invasive diagnosis of the acute rejection after renal transplantation. 相似文献
49.
Massimo Tomellini 《Topics in Catalysis》1994,1(1-2):169-176
In this paper is presented a model for the kinetics of gas adsorption at solid surfaces, in which transient formation is involved. In the case of ideal adsorption where the rate constants are independent of the surface coverages, the kinetics can be solved exactly in the framework of the first order kinetic law. The expression of the sticking coefficient for the final chemisorbed state is obtained in terms of the rate constants introduced in the model and compared to the expression commonly adopted in the literature. By means of a fitting procedure the kinetics were used to describe experimental data on the dioxygen adsorption at the Zn(0001) surface. An appropriate analysis of the fitting parameters, derived from adsorption data collected at different temperature of the substrate, allows for the activation energy of the processsurface transient final adsorbed species to be estimated. 相似文献
50.
Huanran Zheng Shibin Wang Shoujie Liu Jiao Wu Jianping Guan Qian Li Yuchao Wang Yu Tao Shouyao Hu Yu Bai Jinxian Wang Xiang Xiong Yu Xiong Yongpeng Lei 《Advanced functional materials》2023,33(40):2300815
The rational design and construction of efficient and inexpensive bifunctional oxygen electrocatalysts are highly desirable for the development of rechargeable Zn–air batteries (ZABs). Although single-atom Fe sites anchored on N-doped carbon catalysts (Fe1/NC) ensure high oxygen reduction reaction activity, their unitary atomically dispersed active center faces difficult condition in catalyzing oxygen evolution reaction simultaneously. Herein, a composite catalyst containing heterointerface between Fe1/NC and selenides ((Fe,Co)Se2) is constructed. The obtained (Fe,Co)Se2@Fe1/NC exhibits extremely narrow potential gap of 0.616 V and remarkable stability in alkaline media, outperforming the benchmark catalysts (Pt/C+RuO2: 0.720 V). Experimental results and density functional theory calculations reveal that heterointerface between Fe1/NC and (Fe,Co)Se2 accelerates the electron transfer and provides more moderate adsorption sites, which endow (Fe,Co)Se2@Fe1/NC with extremely high bifunctional oxygen catalytic activity. This study not only provides a superior bifunctional catalyst for ZABs, but also enriches the application of single-atom catalysts in multifunctional energy storage and conversion devices. 相似文献