检索结果-南通市图书馆

Anatomical Research on the Brain of African Ostrich

在线全文

学校读者我要写书评

暂无评论

Anatomical Research on the Brain of African Ostrich

混流式水轮机蜗壳与座环三维中湍流场的数值模拟

中国畜牧兽医学会动物解剖学及组织胚胎学分会第十五次学术研讨会

作者： Peng Kemei Feng Yueping Zhang Gaoying Liu Huazhen Song Hui college of animal science and Veterinary Medicine,Huazhong agricultural university,Wuhan 430070,china.

The anatomical characteristics of African ostrich brain were described in the *** average weight,length and width of total brain is 26.34g,59.26mm and 42.30 mm,*** cerebellum appears relatively well developed, which obviously protrudes *** posterior superior part of the cerebellum vermis almost forms an angle of 130°.The number of transverse fissurae of the cerebellum vermis is much more than that of the domestic ***,the surface area of African ostrich cerebellum is relatively *** formation of the cerebrum is obtuse *** surface is smooth, and there are no gyrus and sulcus on *** gray matter is very *** is an arcuated telencephalic vallicule on the dorsal surface and the sagittal eminence is *** olfactory bulbs are quite *** hypophysis is *** total brain only represents 0.015% of the whole body weight,and it is 17 times lighter than the brain of the domestic fowls. Statistical analysis showed that the brain weight relative to body weight is significantly lower (p<0.01) in African ostrich than in three domestic fowls *** present study suggest that the brain of African ostrich is underdeveloped.

关键词： African ostrich brain anatomy

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

水动力学研究与进展（A辑） 2004年第6期19卷 713-718页

作者：辛喆张兰金常近时中国农业大学工学院北京100083 中国农业大学水利与土木工程学院北京100083

　用数值方法研究混流式水轮机引水元件内部流场是优化其设计的一个重要手段。本文基于Navier Stokes方程和标准的k ε紊流模型,采用贴体坐标和交错网格系统,用SIMPLEC算法对一模型机组的蜗壳、座环和导叶进行了联合计算,通过对不同工... 详细信息

　用数值方法研究混流式水轮机引水元件内部流场是优化其设计的一个重要手段。本文基于Navier Stokes方程和标准的k ε紊流模型,采用贴体坐标和交错网格系统,用SIMPLEC算法对一模型机组的蜗壳、座环和导叶进行了联合计算,通过对不同工况下其内部三维湍流流场计算结果的分析,为改进和优化混流式水轮机引水元件的设计提供了一些有益的参考资料。

关键词：引水元件 N-S方程 κ-ε紊流模型 SIMPLFC算法三维数值模拟

Change in Shape and Crystal Structure of HAP Nanoparticles during Absorption into Cell

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials science) 2007年第3期22卷 443-445页

作者：扈盛李世普 Biomedical Materials and Engineering Center Wuhan University of Technology

The change of hydroxyapatite （HAP） nanoparticles in shape and crystal structure after endocytosis into cancer cells was studied. BEL7402 cells were incubated with HAP nanoparticles for 2 hour, 8 hours, 20 hours, respectively. Then, the cells were collected and viewed under a transmission electronic microscope （TEM）. Electronic diffraction （ED） attached to TEM was used to detect the properties of the particles. The results show that HAP particles in the cytoplasm can be degraded in cytoplasm. The degradation process is prolonged by more than 20 hours. Thus, it is concluded that HAP nanoparticles would be degraded after kill cells or delivery gene.

关键词： HAP nanoparticle cancer cell degradation

Expressions of β_3 Integrin and Fibronectin in Salpingitis

在线全文

学校读者我要写书评

暂无评论

Journal of Reproduction and Contraception 2011年第4期22卷 211-216页

作者： Huan JIANG Wei-jie ZHU Jing LI Institute of Reproductive Immunology College of Life Science and Technology Jinan University Guangzhou510632 China Department of Pathophysiology Medical College Jinan University Guangzhou 510632 China

Objective To investigate the association between β3 integrin-fibronectin signaling and salpingitis. Methods Thirteen chronically inflamed tubal samples were included in the case group, while 29 normal fallopian tube samples were set as the controls. Immunohistochemistry was used to determine the distribution patterns and expressions of β3 integrin and fibronectin in the fallopian tube samples. Results β3 integrin was presented in the ciliated cells within the whole length of the normal fallopian tube, but no staining was detected in the tubal epithelium of salpingitis. A similar distribution pattern offibronectin was revealed between the cases and the controls, with exclusive staining in the tubal mucosal matrix and the basement membranes of the tubal epithelium and mucosal vessels, whereas no staining was detected in the tubal epithelial cells. Fibronectin in the samples of salpingitis showed a remarkably stronger-staining than that of the normal controls （P〈0.01）. Conclusion Salpingitis could reduce β3 integrin expression and raise fibronectin expression in the fallopian tube epithelium, concomitantly changed concentrations of β3 integrin and fibronectin seem to have impacts on the onset of salpingitis.

关键词： β3 integrin fibronectin salpingitis

A constitutive model of frozen soil with damage and numerical simulation for the coupled problem

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2010年第4期53卷 699-711页

作者： ZHU ZhiWu, NING JianGuo& MA Wei 1 School of Mechanics and Engineering, Southwest Jiaotong university, Chengdu 610031, china 2 State Key Laboratory of Explosion science and Technology, Beijing Institute of Technology, Beijing 100081, china 3 Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou 730000, china School of Mechanics and Engineering Southwest Jiaotong University Chengdu China State Key Laboratory of Explosion science and Technology Beijing Institute of Technology Beijing China Key Laboratory of Frozen Soil Engineering CAREERI CAS Lanzhou China

Based on the microcosmic mechanics of composite materials, an elastic constitutive model for frozen soil with damage is presented. For frozen sandy soil with a range of ice contents and under a range of temperature conditions, quantitative results determined by this constitutive model agree with practically measured stress-strain curves. After numerically simulating the coupled water, temperature and stress fields of channel frozen and frozen roadbed using a self-developed finite-element routine, more accurate and practical calculation results for the temperature field coupled with stress, displacement and strain fields are obtained; the results match predictions and tests undertaken by earlier researchers. Our results support the reliability of our routine for calculating interdependent physical quantities of frozen soil and for describing the relationships between them. Our program can offer necessary constraints for engineering design and construction in permafrost regions.

关键词： frozen soil microcosmic mechanics roadbed coupling stress field

A problem of complex oscillation for homogeneous linear differential equations

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1998年第20期43卷 1709-1712页

作者： GAO Shian and YANG Ronghua Department of Mathematics,South china Normal university,Guangzhou 510631, china Department of Mathematics, Guangdong Educational college, Guangzhou 510303, china Department of Mathematics South China Normal University Guangzhou China Department of Mathematics Guangdong Educational College Guangzhou China

Under a combined dominant condition, an open problem of complex oscillation for the equation \%w (k) +Aw=0\% is set, where \%k≥3, a(z)\% is a transcendental entire function.

关键词： meromorphic function differential equation complex oscillation.

Static shape control of a flat shell structure

在线全文

学校读者我要写书评

暂无评论

吉林大学学报(工学版) 2006年第S1期 1-3页

作者： Yao Guo-feng, Zhang Lin-wen, Luo Zhi-jiu (college of Mechanical science and Engineering, Jilin university, Changchun 130022, china Jilin college of Traffic Profession Technique, Changchun 130021 ,china)

The eight-node and forty-DOF piezoelectric shell element were applied to shape control of a flat shell structure. By the direct and converse effects, a distributed piezoelectric sensor layer was used to monitor the shape deformation and a distributed actuator layer was used to suppresse the deflection. A finite element model was for static response of laminated shell with piezoelectric sensors/actuators was derived. The model was verified by calculating piezoelectric polymeric PVDF bimorph beam. The results are in good agreement with those obtained by theoretical analysis of Tzou and Hwang . A case study of the static shape control of a flat shell structure is presented.

关键词： piezoelectric shell element static shape control feedback control

Preparation and Characterization of Starch-g-PVA/Nano-hydroxyapatite Complex Hydrogel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(Materials science) 2005年第B12期20卷 58-59页

作者：高永康萧聪明 college of Materials science and Engineering Huaqiao University Quanzhou 362021 China

Starch-g-PVA / hydroxyapatite complex hydrogel was prepared with two- repeated freezing/thawing circles. SEM observation results exhibits that hydroxyapatite is dispersed in starch-g-PVA in nanoscale. Thermogravimetric analysis curves show that the remained fraction keeps the same at the temperatures higher than 490℃. It was found the dried starch-g-PVA/hydroxyapatite films could resuell within 12 minutes.

关键词： starch-g-PVA hydroxyapatite hydrogel preparation

Microstructure evolution and non-equilibrium solidification of undercooled Ni-29.8at% Si eutectic alloy melts

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2010年第4期53卷 1043-1048页

作者： LU YiPing1,LI TingJu1,TENG HaiTao1,FU YaBo1,LUO DaWei1 &YANG GenCang2 1 School of Materials science and Engineering,Dalian university of Technology,Dalian 116024,china 2 State Key Laboratory of Solidification Processing,Northwestern Polytechnical university,Xi’an710072,china School of Materials science and Engineering Dalian University of Technology Dalian China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi’an China

Microstructure formation and transition of undercooled bulk Ni70.2Si29.8 eutectic alloy melt were investigated by melt fluxing,cyclical overheating and cooling under high-frequency vacuum *** maximum undercooling of the alloy melt amounted to 428 *** electron microscope(SEM),energy-dispersive X-ray spectroscopy(EDS) and optical microscopy techniques(OM) were adopted to investigate the microstructure and identify the phase *** cooling curves of eutectic alloys upon solidification which were subjected to different undercoolings were described and *** complex microstructure evolution was observed in the as-solidified samples with the increase of ***,an extremely fine microstructure was achieved at the max undercooling of 428 K,and the lamellar distance of about 50-100 nm was *** on the solution entropy of eutectic phases,the microstructure transition with the undercooling was *** results showed that the microstructure transition process was ascribed to solution entropy of transition,i.e.,the complex microstructure evolution was attributed to a transition from faceted-faceted(FF)→faceted-nonfaceted(FN)→nonfaceted-nonfaceted(NN) eutectic systems concurring with increased undercooling.

关键词： interface structure solidification entropy metals and alloys