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排序方式: 共有218条查询结果,搜索用时 218 毫秒
61.
62.
L. V. Krishnamoorthy D. H. Wood R. A. Antonia A. J. Chambers 《Experiments in fluids》1985,3(3):121-127
The influence on several hot wire measurements of the diameter d and overheat ratio a of a wire placed near a conducting wall in a turbulent boundary layer is investigated. These measurements include the mean velocity and second, third and fourth order moments of the longitudinal velocity fluctuation u. A decrease in either d or a reduces the departure of the measured mean velocity from the expected linear sublayer value. The measured influence of d and a precludes the use of a universal correction for the mean velocity. There is no influence of a on the rms, skewness and flatness factors of u. Only a small increase is found in the skewness and flatness factors of u when d is decreased. 相似文献
63.
64.
0–1 problems are often difficult to solve. Although special purpose algorithms (exact as well as heuristic) exist for solving
particular problem classes or problem instances, there are few general purpose algorithms for solving practical-sized instances
of 0–1 problems. This paper deals with a general purpose heuristic algorithm for 0–1 problems. In this paper, we compare two
methods based on simulated annealing for solving general 0–1 integer programming problems. The two methods differe in the
scheme used for neighbourhood transitions in the simulated annealing framework. We compare the performance of the two methods
on the set partitioning problem. 相似文献
65.
T. G. Deepak A. Krishnamoorthy Viswanath C. Narayanan K. Vineetha 《Annals of Operations Research》2008,160(1):191-213
An inventory system with two parallel service facilities is considered. A certain number of customers are transferred from
longer to shorter queue whenever their difference reaches a prescribed quantity. Along with this customer transfer, a certain
quantity of inventory is also transferred, depending on availability. Further, if one of the queues has customers, but has
no inventoried items whereas the other has at least one inventoried item to spare, then exactly one item is taken to the former
and service begins thereby enhancing the efficiency of the system. Stability of the system is analysed. Several performance
measures that helps in efficient design of such systems, are computed. Some numerical results are provided. 相似文献
66.
Sarada P. Mishra K. Krishnamoorthy Rabindra Sahoo Anil Kumar 《Journal of polymer science. Part A, Polymer chemistry》2005,43(2):419-428
Monosubstituted and disubstituted 3,4‐propylenedioxythiophenes were synthesized and polymerized by both chemical and electrochemical methods. All the monomers were characterized for their molecular structures, and the polymers were characterized for their electrochemical properties. The disubstituted derivatives showed higher contrast than the corresponding monoalkyl derivatives. The highest electrochromic contrast of 89% was exhibited by a dibenzyl derivative, but the derivative was insoluble. On the other hand, the electrochemically polymerized dihexyl‐ and didodecyl‐substituted poly(3,4‐propylenedioxythiophene)s exhibited 74 and 77% electrochromic contrast, respectively, and were soluble. The molecular weights of the chemically and electrochemically synthesized polymers were analyzed by gel permeation chromatography. The chemically synthesized polymers showed higher molecular weights. © 2004 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 419–428, 2005 相似文献
67.
The monomeric title compound features a distorted octahedral tin (IV) centre within a C2Cl2N2 donor set with two cis Cl atoms and two trans benzyl groups. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献
68.
Bala Krishnamoorthy 《Operations Research Letters》2017,45(1):77-83
In the context of branch-and-bound (B&B) for integer programming (IP) problems, a direction along which the polyhedron of the IP has minimum width is termed a thin direction. We demonstrate that a thin direction need not always be a good direction to branch on for solving the problem efficiently. Further, the integer width, which is the number of B&B nodes created when branching on the direction, may also not be an accurate indicator of good branching directions. 相似文献
69.
Krishnamoorthy P Browning RG Singh S Sivappa R Lovely CJ Dias HV 《Chemical communications (Cambridge, England)》2007,(7):731-733
A silver(I) complex derived from a polyfluorinated tris(pyrazolyl)borate effectively catalyzes carbene transfer to allylic and propargylic halides, leading to the formation of alpha-haloacetate derivatives. 相似文献
70.
R. N. Nair T. M. Krishnamoorthy K. C. Pillai 《Isotopes in environmental and health studies》2013,49(3):225-236
Abstract A simplified model has been developed to arrive at spatial and temporal distribution of radionuclide concentration in fracture waters of granite host rock containing high level radioactive waste repository. The modelling has been carried out using two coupled one-dimensional equations, one for the fracture and the other for host rock. The source term to the model is provided using a two component exponential leaching system from the vitrified waste form stored in the repository. The processes considered are advection, radioactive decay and adsorption on the surface in the case of fracture, and diffusion, radioactive decay and adsorption in the microfissures of the medium in the case of host rock. The concentrations of various radionuclides are discussed in relation to the physico-chemical parameters of the system. 相似文献