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941.
This paper describes an optical system for high temperature creep strain measurement using quartz optical fiber, super long working distance microscope and digital image processing techniques. In this system one end of the quartz optical fibers is arrayed in a small area on the specimen surface and the other end is illuminated by a laser beam. The fiber ends on the specimen surface form the spot array. The small optical spots on the specimen are tracked by a CCD camera and the images are processed by digital image processing software. The diameter of each quartz fiber is 100 μm and the fibers can be arrayed in a small area. The local strains are determined by measuring the variety of relative distance between two spots. Experimental results of local creep strain on the welding joints of 15CrMo and HK40 at 850°C are obtained. 相似文献
942.
Z.J. Li X.L. Chen H.J. Li Q.Y. Tu Z. Yang Y.P. Xu B.Q. Hu 《Applied Physics A: Materials Science & Processing》2001,72(5):629-632
Low-dimensional GaN materials, including nanorings, nanoribbons and smooth nanowires have been synthesized by reacting gallium
and ammonia using Ag particles as a catalyst on the substrate of MgO single crystals. They were characterized by field emission
scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). EDX, XRD indicated
that the low-dimensional nanomaterials were wurtzite GaN. New features are found in Raman scatterings for these low-dimensional
GaN materials, which are different from the previous observations of GaN materials.
Received: 16 November 2000 / Accepted: 17 November 2000 / Published online: 21 March 2001 相似文献
943.
采用函数级数展开法精确求解了在非理想射频源、考虑二次谐波Mathieu方程的解,得到了一些有意义的物理结果. 相似文献
944.
Parallel Simulated Annealing Algorithms in Global Optimization 总被引:4,自引:0,他引:4
Global optimization involves the difficult task of the identification of global extremities of mathematical functions. Such problems are often encountered in practice in various fields, e.g., molecular biology, physics, industrial chemistry. In this work, we develop five different parallel Simulated Annealing (SA) algorithms and compare them on an extensive test bed used previously for the assessment of various solution approaches in global optimization. The parallel SA algorithms consist of various categories: the asynchronous approach where no information is exchanged among parallel runs and the synchronous approaches where solutions are exchanged using genetic operators, or where solutions are transmitted only occasionally, or where highly coupled synchronization is achieved at every iteration. One of these approaches, which occasionally applies partial information exchanges (controlled in terms of solution quality), provides particularly notable results for functions with vast search spaces of up to 400 dimensions. Previous attempts with other approaches, such as sequential SA, adaptive partitioning algorithms and clustering algorithms, to identify the global optima of these functions have failed without exception. 相似文献
945.
946.
Şenay Yurdakul M. Tahir Güliüoğlu 《Journal of inclusion phenomena and macrocyclic chemistry》2001,40(3):231-237
Infrared spectra of M(piperidine)2Ni(CN)4.0.5G (M=Co, Ni or Cu;G= chlorobenzene, 1,2-dichlorobenzene or 1,3-dichlorobenzene; M=Co or Ni;G=1,4-dichlorobenzene) compounds are reported. The piperidine molecules inthe host permit the inclusion of bulky guest molecules. The spectral featuressuggest that the compounds are similar in structure to the Hofmann-type clathrates. 相似文献
947.
采用丝网印刷技术制备一次性薄片碳电极,并在此电极上进行了化学修饰,于邻苯二酚-甲醛-NaOH溶液中的,在-0.1V~1.2V电位范围内,循环发法进行电聚合,可获得性能良好的修饰电极,该电极可用于阳极深出伏安法测量痕量铜,其响应灵敏度较裸碳电极提高50倍以上,线笥范围为2.5~50μg/L;测量的RSD为2.7%,用该电极可直接测定当是自来水中铜的含量为6.27μg/L。 相似文献
948.
Let s(n) denote the sum of digits of the Zeckendorf representation of n and . The aim of this paper is to discuss the behaviour of $S_{q,i}(N)$. First it is shown that that the values of admit a Gaussian limit law with bounded mean and variance of order log N. Conversely, for q≤1 (mostly) has a periodic fractal structure. We also prove that which is an analogue to a well-known result by Newman [14] for binary digit expansions.
Received: 15 March 1999 / Revised version: 5 November 1999 相似文献
949.
Gürsoy Süleyman Koçak Makbule Cihan Ali Gül Ahmet Bekaroğlu Özer 《Transition Metal Chemistry》2000,25(4):474-477
A new soluble vic-dioxime ligand namely 1,4-bis(2′-hydroxyethyl)-2,3-bis(hydroxyimino)-5,6-diphenylpiperazine, (LH2) containing optically active centers has been prepared as a mixture of isomers from (CNO)2 and N,N-bis(2-hydroxyethyl)stilbendiamine (1) which has been made by the reduction of the condensation of the product of benzaldehyde and 2-aminoethanol in the presence
of aluminum amalgam. N,N-coordinated planar metal complexes of this ligand have been synthesized with NiII, CuII, CoII, PdII and UVIO2. Oxidation of (LH)2Co in the presence of a base, such as pyridine, leads to an octahedral complex (LH)2CopyCl containing pyridine and chloride as axial ligands in addition to vic-dioxime ligands. The structures of the ligand and its complexes are proposed on the basis of elemental analysis, 1H-n.m.r., mass, i.r. and u.v.–vis. spectral data.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
950.
催化消除汽车尾气中氮氧化物(NOx)物种在大气环境保护方面有着重要意义.随着环保法规的越来越严格,研制活性更高,稳定性更好的 NOx催化剂势在必行.贵金属 Pt、Pd、Rh三效催化剂(TWC)能够同时去除 NOxs、CO、HxCy三种污染物,生产工艺比较成熟.其中Rh是公认的促使NOx还原为N2的最有效组分,但Rh的价格较高且资源贫乏,限制了其实际应用.所以人们一直尝试采用一种廉价的替代品.单Pd的三效催化剂,由于其相对低廉的价格,较好的耐高温性能,有可能是合适的选择[1-2].此外,以NH3为还… 相似文献