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81.
82.
B.S. Okhuysen 《International Journal of Engineering Science》2008,46(3):189-201
Linear flow instabilities of the liquid and mushy regions during directional solidification of a binary alloy are studied under a high gravity environment where the rotation axis is inclined with respect to the high gravity vector. Stability analysis and numerical computation are carried out to determine the results for the stationary disturbances at several values of the rotation rates and for given values of the other parameters. The results provide information about the effects of Coriolis force on various flow features in the liquid and mushy layers. The preferred structure of the mush-liquid interface is found to be that of longitudinal rolls. The main mode of convection is found to be able to generate double-cell structure in the vertical direction and is strengthened in the mushy layer by the Coriolis force. The Coriolis force appears to be generally stabilizing in the sense that the motion in the liquid zone is significantly weakened, the tendency for the chimney formation in the mushy zone is reduced and the critical values of the liquid and mush Rayleigh numbers and the wave number increase with increasing the rotation rate. 相似文献
83.
核电厂功能安全措施完整性标准与第3方验证——2.核电市场化:国际标准化平台上的企业联合 总被引:1,自引:1,他引:0
沈经 《仪器仪表标准化与计量》2008,(1):11-18
在8国峰会限火电,绿色和平挺核电的2007新政治环境中与跨国核电集团优化联合的新形势下,探讨计划经济形成的两弹-艇核工业,在勃兴的市场竞争中,引进与依托在标准化平台上的本国企业大联合。 相似文献
84.
85.
The mathematical aspects of the theory of nonabelian statistics and anyons are discussed. The dynamics and kinematics of these
objects are defined by Hamiltonians which are the sums of terms associated with different roots of a given root system. The
equations of Fuchsian type which are the so-called generalized Knizhnik-Zamolodchikov equations associated with the root systemsA
n
,B
n
, andC
n
, are presented. Some results the generalized pure braid groups and their application for defining the generalized anyon are
discussed. The factorization of the spin Calogero-Sutherland operators and their connection with the theory of nonabelian
statistics and anyons are given.
To Dmitrii Anosov with admiration and deep respect on his sixtieth birthday
The research was supported by Grants RFFI-INTAS 00418 and RFFI-Germany 96-01-00008G. 相似文献
86.
An analysis is presented to understand the role of microstructures on the two crack growth driving force parameters, and , without invoking the extrinsic crack closure concepts. Microstructural variables considered are: grain size, precipitates and stacking fault energy. It is shown that is strongly affected by the scale of the microstructure, such as grain size or precipitate spacing. For each case, the mode of slip deformation and environment affects the fatigue resistance as represented by . However, the microstructures seem to have a smaller effect on . Also, the enhanced planarity of slip from the reduction in stacking fault energy has a pronounced effect on when compared with the materials deforming under homogeneous slip. 相似文献
87.
Jean Marcel Pallo 《Computing》2001,66(3):297-308
This paper generalizes to k-ary trees the well-known rotation transformation on binary trees. For brevity, only the ternary case is developped. The rotation
on ternary trees is characterized using some codings of trees. Although the corresponding poset is not a lattice, we show
that it is a χ-lattice in the sense of Leutola–Nieminen. Efficient algorithms are exhibited to compute meets and joins choosen
in a particular way.
Received May 22, 2000; revised December 11, 2000 相似文献
88.
Young‐Mo Kim Kumarasamy Murugesan Yoon‐Young Chang Eun‐Ju Kim Yoon‐Seok Chang 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2012,87(2):216-224
BACKGROUND: Polybrominated diphenyl ethers (PBDEs) are emerging persistent organic pollutants. Degradation of PBDEs is a significant challenge owing to their extreme persistence and recalcitrance nature. The objective of this study was to evaluate the effect of a sequential nano‐bio treatment using nanoscale zero‐valent iron (nZVI) and diphenyl ether degrading bacteria Sphingomonas sp. PH‐07 for degradation of PBDEs. RESULTS: In the bacterial tolerance test for determining the maximum endurable concentration of nZVI, the PH‐07 strain was able to grow in the presence of nZVI up to 5 g L?1 in minimal salt medium by using non‐brominated diphenyl ether as growth substrate. Reductive debromination of decabrominated diphenyl ether (deca‐BDE; 1 mg) with nZVI (100 mg per vial) resulted in a 67% reduction of deca‐BDE and produced various intermediates ranging from nona‐BDEs to tri‐BDEs during a 20 day period. Additional experiments with 2,4,4′‐tri‐BDE and 2,4,6‐tri‐BDE as initial substrates revealed that both tri‐BDEs were further debrominated to mono‐BDEs. Following the reductive debromination process, reaction mixtures were aerobically treated with DE‐grown Sphingomonas sp. PH‐07 strain to mineralize the low brominated‐DEs (tri‐BDEs—mono‐BDEs) for additional 4 days. During bacterial treatment, the low brominated‐DEs were biologically degraded to bromophenols and other prospective metabolites. CONCLUSIONS: The nZVI‐biological sequential treatment method was found to be effective for degradation of PBDEs through reductive debromination followed by biological oxidation. This hybrid treatment method may lead to the development of a remediation strategy for highly halogenated environmental pollutants in contaminated sites. Copyright © 2011 Society of Chemical Industry 相似文献
89.
07MnNiCrMoVDR钢是一种调质型低合金高强度低温用钢。现已广泛应用于低温工作的容器、管道等结构中。本文通过对07MnNiCrMoVDR钢的可焊性进行分析,制定了钢板对接的焊接工艺,并在焊接过程中采取了质量控制措施,对厚度为38mm的钢板实施了对接。焊后对焊接接头进行力学性能试验,并得到了相应的力学性能参数和焊接是否满足使用要求的结论。 相似文献
90.
I. Antcheva M. Ballintijn B. Bellenot M. Biskup R. Brun N. Buncic Ph. Canal D. Casadei O. Couet V. Fine L. Franco G. Ganis A. Gheata D. Gonzalez Maline M. Goto J. Iwaszkiewicz A. Kreshuk D. Marcos Segura R. Maunder L. Moneta A. Naumann E. Offermann V. Onuchin S. Panacek F. Rademakers P. Russo M. Tadel 《Computer Physics Communications》2009,180(12):2499-2512