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Submanifolds of Constant Scalar Curvature in a Space Form
Zhong Hua Hou KYUNGPOOK UNIVERSITY 1998 Kyungpook mathematical journal Vol.38 No.1
Let M^(n) be a closed submanifold immersed into a space formM~^(n+p)_ (c) of constant curvature c≥ 0. Denote by R the normalized scalar curvature and by H the mean curvature of M^(n) : Suppose that R is constant and R≥ c. We firstly extend Cheng-Yau's technique to higher codimension cases. Then we study the rigidity problem for M^(n) with parallel normalized mean curvature vector field. We show that, if H satisfies a certain inequality, then M^(n) is totally umbilical or the equaluity holds. We describe all M^(n) that satisfy this equality. We also prove some rigidity theorems of Yano-Ishihara's type and extend the rigidity theorems of H. Li to higher codimension. 0. Introduction
Zhu, Zhong-Zheng,Wang, Dong,Cong, Wen-Ming,Jiang, Hongmei,Yu, Yue,Wen, Bing-Ji,Dong, Hui,Zhang, Xiao,Liu, Shu-Fang,Wang, Ai-Zhong,Zhu, Guanshan,Hou, Lifang Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.1
Background: Males have a higher prevalence of hepatocellular carcinoma (HCC) than females in general, but the reasons for the sex disparity are still obscure. DNA copy number alteration (CNA) is a major feature of solid tumors including HCC, but whether CNA plays a role in sex-related differences in HCC development has never been evaluated. Methods: High-resolution array comparative genomic hybridization (CGH) was used to examine 17 female and 46 male HCC patients with chronic hepatitis B virus (HBV) infection in Shanghai, China. Two-tailed Fisher's exact or ${\chi}^2$ tests was used to compare CNAs between females and males. Results: The overall frequencies and patterns of CNAs in female and male cases were similar. However, female HCC tumors presented more copy number gains compared to those in males on 1q21.3-q22 (76.5% vs. 37.0%, P = 0.009), 11q11 (35.3% vs. 0.0%, P = 0.0002) and 19q13.31-q13.32 (23.5% vs. 0.0%, P = 0.004), and loss on 16p11.2 (35.3% vs. 6.5%, P = 0.009). Relative to females, male cases had greater copy number loss on 11q11 (63.0% vs. 17.6%, P = 0.002). Further analyses showed that 11q11 gain correlated with 19q13.31-q13.32 gain (P = 0.042), 11q11 loss (P = 0.011) and 16p11.2 loss (P = 0.033), while 1q21.3-q22 gain correlated with 19q13.31-q13.32 gain (P = 0.046). Conclusions: These findings suggest that CNAs may play a role in sex-related differences in HBVassociated HCC development.
Hou-Yang Kang,Li-Juan Lin,Zhi-Jian Song,Jing-Ya Yuan,Mei-Yu Zhong,Hai-Qin Zhang,Xing Fan,Li-Na Sha,Yi Wang,Li-Li Xu,Jian Zeng,Yong-Hong Zhou 한국유전학회 2012 Genes & Genomics Vol.34 No.5
Semi-dwarfism is an agronomically important trait in breeding for resistance to damage by wind and rain (lodging resistance)and for stable high yields. Dwarf Polish wheat (Triticum polonicum L., 2n = 4x = 28, AABB AS304) is a potential donor of dwarfing and other traits for common wheat improvement. A genetic analysis using an F2 population derived from a cross of AS304 and tall cultivar AS302 and derived F2:3 lines indicated that AS304 carries a recessive dwarfing gene, temporarily designated Rht-dp. Molecular markers and bulked segregant analysis were used to characterize and map the gene. Eight polymorphic SSR markers (Xwmc511, Xgwm495, Xgwm 113, Xgwm192, Xgpw7026, Xgpw3017, Xgpw1108 and Xgpw7521) on chromosome arm 4BS and two AFLP markers (M8/E5 and M4/E3) were mapped relative to the dwarfing locus. The closest linked markers, Xgpw3017 and M8/E5 at 0.5 and 3.5 cM, respectively, from Rht-dp will enable its marker assisted transfer to wheat breeding populations. Allelic tests indicated that Rht-dp was allelic to Rht-B1b; hence it may be an alternative allele at the Rht-B1 locus.
Zhong, Keli,Cai, Mingjun,Hou, Shuhua,Bian, Yanjiang,Tang, Lijun Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
A phenylbenzimidazole derivatized sensor (L) that behaves as a ratiometric fluorescent receptor for $Zn^{2+}$ in water has been described. In HEPES buffer at pH 7.4, sensor L displays a weak fluorescence emission band at 367 nm. Upon addition of $Zn^{2+}$, the emission intensity at 367 nm is decreased, concomitantly, a new emission band centered at 426 nm is developed, thus facilitates a ratiometric $Zn^{2+}$ sensing behavior. Sensor L binds $Zn^{2+}$ through a 1:1 binding stoichiometry with high selectivity over other metal cations. Sensor L displays a linear response to $Zn^{2+}$ concentration from 0 to $6.0{\times}10^{-5}M$, sensor L also exhibits high sensitivity to $Zn^{2+}$ with a detection limit of $3.31{\times}10^{-7}M$.
A Simple Benzimidazole Based Fluorescent Sensor for Ratiometric Recognition of Zn2+ in Water
Keli Zhong,Mingjun Cai,Shuhua Hou,Yanjiang Bian,Lijun Tang 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.2
A phenylbenzimidazole derivatized sensor (L) that behaves as a ratiometric fluorescent receptor for Zn 2+ in water has been described. In HEPES buffer at pH 7.4, sensor L displays a weak fluorescence emission band at 367 nm. Upon addition of Zn 2+ , the emission intensity at 367 nm is decreased, concomitantly, a new emission band centered at 426 nm is developed, thus facilitates a ratiometric Zn 2+ sensing behavior. Sensor L binds Zn 2+ through a 1:1 binding stoichiometry with high selectivity over other metal cations. Sensor L displays a linear response to Zn 2+ concentration from 0 to 6.0 × 10 -5 M, sensor L also exhibits high sensitivity to Zn 2+ with a detection limit of 3.31 × 10 -7 M.
Atomistic Numerical Simulation on Nanoupsetting Process of Copper Brick
Ji Zhong,Hou Shuai,Liu Ren 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Nanofabrication techniques such as nanoforging have been used to fabricate nanosize components in recent years. As a basic form of nanoforging process, nanoupsetting was studied in this paper via atomistic simulation. First a simplified computation model for upsetting process of single crystalline copper was created, and then the deformation mechanism was investigated at the atomic scale. The results show that the plastic deformation was initiated by the highlevel strain at the corners of the brick; partial dislocations nucleated at the corners and propagated along the [101] and [011] directions in the ( ? ? 1) plane; after unloading, the defects did not disappear or move out to the surface due to lattice friction; the computed load during nanoupsetting agrees well with the theoretical value. At last, the FEM simulation results for this single crystal were also shown, but no load drop was found in its load-displacement curve, which indicates that atomistic simulation is more elaborate than crystal plasticity FEM for nanoscale forming problems.
Investigation of Microscale Laser Shock Flat Hole Clinching
Yaxuan Hou,Kexin Ding,Guoxin Lu,Chao Zheng,Zhong Ji 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.9
This paper proposes an improved laser shock flat hole clinching process for joining ductile and brittle materials to obtain single-sided flat joints in microscale. A copper foil is clinched with a perforated sheet and a mechanical joining is achieved by this process. Experiments and numerical simulations are conducted for three thickness combinations of 50 μm/50 μm, 30 μm/50 μm and 20 μm/100 μm to investigate the joinability of this process. The results show that a step-by-step laser shock process with a low-energy pre-shock and a high-energy secondary shock can effectively join the copper foil and the perforated sheet. The three thickness combinations of the upper and lower sheets result in three clinching structures, namely stacked, intermediate and thinning joints. And the joint strength mainly depends on the thinner sheet in a successful joining even for the single joint or the double-joint.
Affine Translation Surfaces with Constant Gaussian Curvature
Fu, Yu,Hou, Zhong-Hua Department of Mathematics 2010 Kyungpook mathematical journal Vol.50 No.2
We study affine translation surfaces in $\mathbb{R}^3$ and get a complete classification of such surfaces with constant Gauss-Kronecker curvature.
Pathophysiologic Findings of Irritable Bowel Syndrome in China
( Li Kun Zhong ),( Xiao Hua Hou ) 대한소화기기능성질환·운동학회 (구 대한소화관운동학회) 2012 Journal of Neurogastroenterology and Motility (JNM Vol.18 No.1
The mechanism of irritable bowel syndrome (IBS) is still incompletely understood in the world although large amount of investigations have been carried out on it. There are many studies on the pathophysiology of IBS in China, which has huge amount of population suffering from IBS with special ethnicity and culture, including Mainland China, Hong Kong and Taiwan. We collected the literatures to show the results and discuss whether there were any differences in the pathophysiologic findings between China and other countries, whether there were any differences among different subtypes and how the pathophysiology correlated with the manifestations of patients. Gene polymorphism, disturbances of gastrointestinal motility, visceral hypersensitivity, intestinal infection and inflammation, psychological disturbances, food hypersensitivity and intolerance, and altered gut microflora were reviewed in this paper. Some conflicting outcomes between China and other countries were noted although most of them were similar. (J Neurogastroenterol Motil 2012;18:19-33)