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Search Results: 1 - 10 of 50951 matches for " WEI RuiBin "
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Comprehensive Study on h-index and Its Statistical Analysis on Practical Application


中国科技期刊研究 , 2009,
Abstract: 介绍了2005年以来国内外h指数的研究成果;指出h指数的应用主要集中在科研人员绩效的评价、期刊评价和科研机构评价三个方面;对科技期刊研究领域部分研究人员的h指数进行了统计和分析。
Effect of Deformation and Aging on Properties of Al-4.1%Cu-1.4%Mg Aluminum Alloy
Hao Wang,Changsheng Li,Jing Li,Xinglong Wei,Ruibin Mei
ISRN Materials Science , 2013, DOI: 10.1155/2013/902970
Abstract: Deformation scheme and preheat treatment of Al-4.1%Cu-1.4%Mg aluminum alloy are chosen, homogenizing annealing at 430°C for 1.5?h, cooling to 250°C in furnace at a cooling rate of less than 30°C/h and then cooling to room temperature to make Al-4.1%Cu-1.4%Mg aluminum alloy annealed fully. Heat treatment tests of Al-4.1%Cu-1.4%Mg aluminum alloy mainly consisting of rolling and aging were conducted, and the optimum peak of aging mechanism is 190°C/12?h. Through comparison of microstructure and mechanical properties with different deformation rates and aging mechanisms, effect of deformation rates and aging mechanism on properties of Al-4.1%Cu-1.4%Mg aluminum alloy was analyzed, and the optimum double peak of aging mechanism is 135°C/7?h?+?185°C/14?h. Orthogonal experiments were carried out to analyze mechanical and electrical properties of tested materials before and after deformation, and the effect of aging mechanism on Al-4.1%Cu-1.4%Mg Al alloy was analyzed, and the optimum regression of aging mechanism is 190°C/12?h?+?240°C/40?min?+?190°C/12?h. Aging scheme is closely related to corrosion resistance of Al-4.1%Cu-1.4%Mg aluminum alloy, and three different aging schemes can improve the corrosion resistance. The exfoliation corrosion evaluation results show that the aging effect on exfoliation corrosion ability order is RRA two-step aging peak aging. 1. Introduction After a combination of solution treatment and aging, Al-Cu-Mg aluminum alloy possesses high strength, which makes it a most widely used aluminum alloy [1]. As a duralumin, Al-Cu-Mg aluminum alloy has a good molding ability and mechanical processing properties. Al-Cu-Mg aluminum alloy products mainly consist of plates, wires, and bars, which are mainly developed for the aircraft skin, bulkheads, wing ribs, engine components, and automobile industries [2, 3]. In order to develop aluminum alloy with high strength, high toughness, and high resistance to stress corrosion cracking, many trials and studies were carried out for decades, and there are mainly two effective methods, thermomechanical treatment (TMT) and retrogression and reaging (RRA) [4, 5]. TMT is a process combining both strain hardening after the plastic deformation and phase transformation strengthening after heat treatment [6]. The basic principle is to increase the density of defects in the metal deformation and change its distribution; deformation defects generated by phase transition during heat treatment will affect nucleation and distribution of the new phases; at the same time, the formation of new phases will pin or block
Intercomparison of Nox,SO2,O3,and Aromatic Hydrocarbons Measured by a Commercial DOAS System and Traditional Point Monitoring Techniques
Intercomparison of NOx, SO2, O3, and Aromatic Hydrocarbons Measured by a Commercial DOAS System and Traditional Point Monitoring Techniques

XIE Pinhu,LIU Wenqing,FU Qiang,WANG Ruibin,LIU Jianguo,WEI Qingnong,
XIE Pinhu
,LIU Wenqing,FU Qiang,WANG Ruibin,LIU Jianguo,WEI Qingnong

大气科学进展 , 2004,
Abstract: A field-based intercomparison study of a commercial Differential Optical Absorption Spectroscopy (DOAS) instrument (OPSIS AB, Sweden) and different point-sample monitoring techniques (PM, based on an air monitoring station, an air monitoring vehicle, and various chemical methods) was conducted in Beijing from October 1999 to January 2000. The mixing ratios of six trace gases including NO, NO2, SO2,O3, benzene, and toluene were monitored continuously during the four months. A good agreement between the DOAS and PM data was found for NO2 and SO2. However, the concentrations of benzene, toluene,and NO obtained by DOAS were significantly lower than those measured by the point monitors. The ozone levels monitored by the DOAS were generally higher than those measured by point monitors. These results may be attributed to a strong vertical gradient of the NO-O3-NO2 system and of the aromatics at the measurement site. Since the exact data evaluation algorithm is not revealed by the manufacturer of the DOAS system, the error in the DOAS analysis can also not be excluded.
Nom1 Mediates Pancreas Development by Regulating Ribosome Biogenesis in Zebrafish
Wei Qin, Zelin Chen, Yihan Zhang, Ruibin Yan, Guanrong Yan, Song Li, Hanbing Zhong, Shuo Lin
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0100796
Abstract: Ribosome biogenesis is an important biological process for proper cellular function and development. Defects leading to improper ribosome biogenesis can cause diseases such as Diamond-Blackfan anemia and Shwachman-Bodian-Diamond syndrome. Nucleolar proteins are a large family of proteins and are involved in many cellular processes, including the regulation of ribosome biogenesis. Through a forward genetic screen and positional cloning, we identified and characterized a zebrafish line carrying mutation in nucleolar protein with MIF4G domain 1 (nom1), which encodes a conserved nulceolar protein with a role in pre-rRNA processing. Zebrafish nom1 mutants exhibit major defects in endoderm development, especially in exocrine pancreas. Further studies revealed that impaired proliferation of ptf1a-expressing pancreatic progenitor cells mainly contributed to the phenotype. RNA-seq and molecular analysis showed that ribosome biogenesis and pre-mRNA splicing were both affected in the mutant embryos. Several defects of ribosome assembly have been shown to have a p53-dependent mechanism. In the nom1 mutant, loss of p53 did not rescue the pancreatic defect, suggesting a p53-independent role. Further studies indicate that protein phosphatase 1 alpha, an interacting protein to Nom1, could partially rescue the pancreatic defect in nom1 morphants if a human nucleolar localization signal sequence was artificially added. This suggests that targeting Pp1α into the nucleolus by Nom1 is important for pancreatic proliferation. Altogether, our studies revealed a new mechanism involving Nom1 in controlling vertebrate exocrine pancreas formation.
Topological Vortices in Chiral Gauge Theory of Graphene
Xin Liu,Ruibin Zhang
Physics , 2010, DOI: 10.1016/j.aop.2009.10.004
Abstract: Generation mechanism of energy gaps between conductance and valence bands is at the centre of the study of graphene material. Recently Chamon, Jackiw, et al. proposed a mechanism of using a Kekul\'{e} distortion background field $% \varphi $ and its induced gauge potential $A_{i}$ to generate energy gaps. In this paper various vortex structures inhering in this model are studied. Regarding $\varphi $ as a generic background field rather than a fixed Nielson-Oleson type distribution, we have found two new types of vortices on the graphene surface --- the velocity field vortices and the monopole-motion induced vortices --- from the inner structure of the potential $A_{i}$. These vortex structures naturally arise from the motion of the Dirac fermions instead of from the background distortion field.
Generalized MICZ-Kepler Problems and Unitary Highest Weight Modules
Guowu Meng,Ruibin Zhang
Mathematics , 2007, DOI: 10.1063/1.3574886
Abstract: For each integer $n\ge 1$, we demonstrate that a $(2n+1)$-dimensional generalized MICZ-Kepler problem has an $\mr{Spin}(2, 2n+2)$ dynamical symmetry which extends the manifest $\mr{Spin}(2n+1)$ symmetry. The Hilbert space of bound states is shown to form a unitary highest weight $\mr{Spin}(2, 2n+2)$-module which occurs at the first reduction point in the Enright-Howe-Wallach classification diagram for the unitary highest weight modules. As a byproduct, we get a simple geometric realization for such a unitary highest weight $\mr{Spin}(2, 2n+2)$-module.
The first fundamental theorem of invariant theory for the orthosymplectic supergroup
Gustav Lehrer,Ruibin Zhang
Mathematics , 2014,
Abstract: We give an elementary proof of the first fundamental theorem of the invariant theory for the orthosymplectic supergroup by generalising the method of Atiyah, Bott and Patodi to the supergroup context. We use methods from super-algebraic geometry to convert invariants of the orthosymplectic supergroup into invariants of the corresponding general linear supergroup on a different space. In this way, a super Schur-Weyl-Brauer duality is established between the orthosymplectic supergroup of superdimension $(m|2n)$ and the Brauer algebra with parameter $m-2n$. The result may be interpreted in terms of the relevant Harish-Chandra super pair action (over the complex field), or equivalently, the orthosymplectic Lie supergroup over the infinite dimensional Grassmann algebra. We also state a corresponding theorem for the orthosymplectic Lie superalgebra, which involves an extra invariant generator, the super-Pfaffian.
The second fundamental theorem of invariant theory for the orthogonal group
Gustav Lehrer,Ruibin Zhang
Mathematics , 2011,
Abstract: Let $V=\C^n$ be endowed with an orthogonal form and $G=\Or(V)$ be the corresponding orthogonal group. Brauer showed in 1937 that there is a surjective homomorphism $\nu:B_r(n)\to\End_G(V^{\otimes r})$, where $B_r(n)$ is the $r$-string Brauer algebra with parameter $n$. However the kernel of $\nu$ has remained elusive. In this paper we show that, in analogy with the case of $\GL(V)$, for $r\geq n+1$, $\nu$ has kernel which is generated by a single idempotent element $E$, and we give a simple explicit formula for $E$. Using the theory of cellular algebras, we show how $E$ may be used to determine the multiplicities of the irreducible representations of $\Or(V)$ in $V^{\ot r}$. We also show how our results extend to the case where $\C$ is replaced by an appropriate field of positive characteristic, and comment on quantum analogues of our results.
Invariant integration on orthosymplectic and unitary supergroups
Kevin Coulembier,Ruibin Zhang
Mathematics , 2012, DOI: 10.1088/1751-8113/45/9/095204
Abstract: The orthosymplectic supergroup OSp(m|2n) and unitary supergroup U(p|q) are studied following a new approach that starts from Harish-Chandra pairs and links the sheaf-theoretical supermanifold approach of Berezin and others with the differential geometry approach of Rogers and others. The matrix elements of the fundamental representation of the Lie supergroup G are expressed in terms of functions on the product supermanifold G_0 x R^{0|N}, with G_0 the underlying Lie group and N the odd dimension of G. This product supermanifold is isomorphic to the supermanifold of G. This leads to a new expression for the standard generators of the corresponding Lie superalgebra g as invariant derivations on G. Using these results a new and transparent formula for the invariant integrals on OSp(m|2n) and U(p|q) is obtained.
Modeling of Slab Induction Heating in Hot Rolling by FEM  [PDF]
Ruibin Mei, Changsheng Li, Xianghua Liu, Bao Li, Bin Han
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.34041
Abstract: FEM (Finite Element Method) has been widely used to solve temperature in hot rolling. The heat gen-erating rate of electromagnetic field has been discussed in order to improve the efficiency and accuracy in the solution of induction heating. A new heat generating rate model was proposed and derived from the calculated results by FEM software in consideration of work frequency, source current density, and the air gap between induction coil and slab. The calculated distribution of heat generating rate in the skin depth by the model is satisfying and reliable compared with that of FEM software. Then, the mathematic model of the heat generating rate model is considered as the density of heat reservoir to solve the temperature in induction heating. Moreover, the temperature evolution of slab in induction heating from a hot rolling plant has been solved by the developed FE code and the calculated temperature has a good agreement with the measured value. Therefore, the heat generating rate model is suitable and efficiency to solve the temperature in induction heating by FEM.
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