检索结果-南通市图书馆

Structural,mechanical,thermodynamic and electronic properties of Pt_(3)M(M=Al,Co,Hf,Sc,Y,Zr)compounds under high pressure

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第5期40卷 1208-1218页

作者： Zong-Bo Li kai Xiong Cheng-Chen Jin Ying-Jie Sun Bao-Wen Wang Shun-Meng Zhang Jun-Jie he yong Mao Materials Genome Institute National Center for International Research on Photoelectric and Energy MaterialsSchool of Materials and EnergyYunnan UniversityKunming 650091China

In this work,the impacts of pressure on the structural,mechanical,thermodynamic and electronic properties of typical Pt_(3)M(M=Al,Co,Hf,Sc,Y,Zr)compounds were investigated systematically by the firstprinciples density function theory *** calculated lattice parameters,volume and elastic constants of Pt_(3)M compounds are in good agreement with available experimental and calculation *** the increase in pressure,the lattice parameters and volume of Pt_(3)M compounds decrease,while the elastic constants,bulk modulus,shear modulus and Young’s modulus *** variations in Pugh’s ratio and Poisson’s ratio indicate that these Pt_(3)M compounds are mechanically stable and *** mechanical anisotropy of these Pt_(3)M compounds is enhanced by rising *** analysis indicates that sound velocity and Debye temperature increase with the increase in *** charge distribution does not change obviously,implying that no phase transition occurs in the range of 0-100 GPa.

关键词： Platinum intermetallic compounds Elastic constants Anisotropy Debye temperature First-principles

Hf_(2)CF_(2)单层热传输及热电性质的第一原理研究

在线全文

学校读者我要写书评

暂无评论

原子与分子物理学报 2025年第4期42卷 168-176页

作者：董文欣李铁平张莉丁迎春何开华中国地质大学(武汉)数学与物理学院武汉430074 宜宾学院材料与化学工程学部宜宾644000

二维MXene材料是一种新型的功能性材料,其在热电领域具有潜在应用价值.本文采用第一性原理计算方法,通过求解声子和电子的玻尔兹曼输运方程,计算研究了MXene Hf_(2)CF_(2)单层的热传输特征和热电性质.声子谱揭示了Hf_(2)CF_(2)单层具有... 详细信息

二维MXene材料是一种新型的功能性材料,其在热电领域具有潜在应用价值.本文采用第一性原理计算方法,通过求解声子和电子的玻尔兹曼输运方程,计算研究了MXene Hf_(2)CF_(2)单层的热传输特征和热电性质.声子谱揭示了Hf_(2)CF_(2)单层具有热力学稳定性.在室温条件下,Hf_(2)CF_(2)单层的晶格热导率为14.25 Wm^(-1)K^(-1),且随着温度的升高而降低;电子热导率却随着温度和掺杂浓度的增加而升高.电输运性质中,电导率和Seebeck系数随载流子浓度的变化相反,确保能够获得优异的热电性能.在600 K条件下,n型MXene Hf_(2)CF_(2)单层的最大功率因子可以达到61.24 mW/(mK^(2)).载流子迁移率具有较高的各向异性,且电子的迁移率远远高于空穴的迁移率.基于热导及电导计算结果,n型MXene Hf_(2)CF_(2)单层沿x轴方向的热电优值可达到1.75,高于其他已报道的类似结构的热电优值,表明了MXene Hf_(2)CF_(2)单层是一种潜在的高性能n型热电材料.

关键词： MXene Hf_(2)CF_(2) 热电性能晶格热导率第一性原理

维普期刊数据库博看期刊

Study of Pickering emulsions stabilized by mixed particles of silica and calcite

在线全文

学校读者我要写书评

暂无评论

Particuology 2010年第4期8卷 390-393页

作者： Sha Wang yongjun he yong Zou Department of Applied Chemistry Xi'an University of Science and Technology Xi'an 710054 China

Picketing emulsions were prepared using mixed particles of silica and calcite as emulsifiers. The effects of the silica content in the mixed particles on the stability and the drop size of the Picketing emulsions were investigated. The results showed that the Picketing emulsions were of the oil-in-water type. With increasing silica content in the mixed partides, the stability and the drop size of the Pickering emulsions decreased. Larger silica particles had more influence on the stability of the emulsions, while smaller ones had more influence on the drop size of the emulsions. The effect of the silica particles on the emulsions was attributed to their adsorptive behavior at the oil-water interfaces of the Picketing emulsions.

关键词： Calcite Silica Mixed panicles Pickering emulsions Stability

Field estimation of maize plant height at jointing stage using an RGB-D camera

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2022年第5期10卷 1274-1283页

作者： Ruicheng Qiu Man Zhang yong he College of Biosystem Engineering and Food Science Zhejiang UniversityHangzhou 310058ZhejiangChina Key Laboratory of Modern Precision Agriculture System Integration Research Ministry of EducationChina Agricultural UniversityBeijing 100083China

Plant height can be used for assessing plant vigor and predicting biomass and yield. Manual measurement of plant height is time-consuming and labor-intensive. We describe a method for measuring maize plant height using an RGB-D camera that captures a color image and depth information of plants under field conditions. The color image was first processed to locate its central area using the S component in HSV color space and the Density-Based Spatial Clustering of Applications with Noise algorithm. Testing showed that the central areas of plants could be accurately located. The point cloud data were then clustered and the plant was extracted based on the located central area. The point cloud data were further processed to generate skeletons, whose end points were detected and used to extract the highest points of the central leaves. Finally, the height differences between the ground and the highest points of the central leaves were calculated to determine plant heights. The coefficients of determination for plant heights manually measured and estimated by the proposed approach were all greater than 0.95. The method can effectively extract the plant from overlapping leaves and estimate its plant height. The proposed method may facilitate maize height measurement and monitoring under field conditions.

关键词： Maize plant heigh Kinect Maize central area Point cloud data Image processing

Immunocytochemical Identification and Localization of Diffuse Neuroendocrine System (DNES) Cells in Gastrointestinal Tract of Channel Catfish (Ictalurus punctatus)

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2009年第2期8卷 238-243页

作者： he Min WANG kai-yu ZHANG Yu College of Veterinary Medicine Sichuan Agricultural University Ya＇an 625014 P.R.China

To detect distribution and relative frequency of diffuse neuroendocrine system （DNES） cells in the gastrointestinal tract of channel catfish （lctalurus punctatus）, the intestinal tract of channel catfish was divided into seven portions from proximal to distal： the enlarged area after oesophagus, cardia, fundus, pylorus, and anterior, middle, and posterior intestine. Immunohistochemical method using the strept avidin-biotin-complex （SABC） was employed. All antisera between seven portions of the channel catfish were compared statistically using statistical package for the social science （SPSS）. Five types of DNES ceils were determined： neuropeptide Y-immunoreactive （NPY-IR） cells were demonstrated in both anterior and middle intestine; serotonin （5-HT） immunoreactive cells were detected throughout the whole gastrointestinal tract; vasoactive intestinal peptide （VIP） positive cells were at the highest frequency in pylorus; glucagon-immunoreactive （GLU-IR） cells were moderate in number in the fundus and anterior, middle intestine, and no immunoreactivity was determined in the other portions; somatostatin （SOM） positive cells were more abundant in the anterior and middle intestine. The regional distribution and relative frequency of immunoreactive cells in the channel catfish, Ictalurus punctatus, are essentially similar to those of other fish. However, some characteristics are observed in this species, which further proved that the diversity of the physiological function of DNES cells was based on their morphology.

关键词： channel catfish lctalurus punctatus gastrointestinal tract DNES cells immunocytochemistry

The Equivariant Family Index Theorem in Odd Dimensions

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2015年第7期31卷 1149-1162页

作者： kai Hua BAO Jian WANG yong WANG School of Mathematics and Statistics Northeast Normal University School of Science Tianjin University of Technology and Education

In this paper, we prove a local odd dimensional equivariant family index theorem which generalizes Freed＇s odd dimensional index formula. Then we extend this theorem to the noncommuta- tive geometry framework. As a corollary, we get the odd family Lichnerowicz vanishing theorem and the odd family Atiyah-Hirzebruch vanishing theorem.

关键词： Odd equivariant family index formula Chern-Connes character Atiyah-Hirzebruch vanishing theorem

Analytical and Experimental Research on Wave Scattering by an Open-Type Rectangular Breakwater with Horizontal Perforated Plates

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2024年第5期23卷 1185-1201页

作者： he Shuyue LIU yong LI Huajun Fisheries College Ocean University of ChinaQingdao 266003China Shandong Province Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China

This study proposes a novel open-type rectangular breakwater combined with horizontal perforated plates on both sides to enhance the sheltering effect of the rectangular box-type breakwaters against longer *** hydrodynamic characteristics of this breakwater are analyzed through analytical potential solutions and experimental *** quadratic pressure drop conditions are exerted on the horizontal perforated plates to facilitate assessing the effect of wave height on the dissipated wave energy of breakwater through the analytical *** hydrodynamic quantities of the breakwater,including the reflection,transmission,and energyloss coefficients,together with vertical and horizontal wave forces,are calculated using the velocity potential decomposition method as well as an iterative ***,the reflection and transmission coefficients of the breakwater are measured by conducting experimental tests at various wave periods,wave heights,and both porosities and widths of the horizontal perforated *** analytical predicted results demonstrate good agreement with the iterative boundary element method solution and measured *** influences of variable incident waves and structure parameters on the hydrodynamic characteristics of the breakwater are investigated through further calculations based on analytical *** indicate that horizontal perforated plates placed on the water surface for both sides of the rectangular breakwater can enhance the wave dissipation ability of the breakwater while effectively decreasing the transmission and reflection coefficients.

关键词： rectangular breakwater horizontal perforated plates analytical solution experimental test hydrodynamic characteristics

KN-93,a specific inhibitor of CaMKⅡ inhibits human hepatic stellate cell proliferation in vitro

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第9期13卷 1445-1448页

作者： Ping An Jun-yong Zhu Yan Yang Peng Lv Yi-Hao Tian Ming-kai Chen he-Sheng Luo Department of Gastroenterology Renmin Hospital of Wuhan University 238 Jiefang Road Wuhan 430060 Hubei Province China Educational Administration Office Renmin Hospital of Wuhan University 238 Jiefang Road Wuhan 430060 Hubei Province China Department of Obstetrics and Gynecology Hubei Xinhua Hospital 5-6 Xin Tian Men Dun Wuhan 430015 Hubei Province China Faculty of Anatomy and Embryology Wuhan University School of Modcine Wuhan 430071 Hubei Province China

AIM： To investigate the effects of KN-93, a CaMKⅡ selective inhibitor on cell proliferation and the expression of p53 or p21 protein in human hepatic stellate cells. METHODS： Human hepatic stellate cells （LX-2） were incubated with various concentrations （0-50 μmol/L） of KN-93 or its inactive derivative, KN-92. Cell proliferation was measured by CCK-8 assay, and the expression of two cell cycle regulators, p53 and p21, was determined by SDS-PAGE and Western blotting. RESULTS： KN-93 （5-50 μmol/L） decreased the proliferation of human hepatic stellate cells in a dosedependent manner from 81.76% （81.76% ± 2.58% vs 96.63% ± 2.69%, P 〈 0.05） to 27.15% （27.15% ± 2.86% vs 96.59% ± 2.44%, P 〈 0.01） after 24 h treatment. Incubation of 10 μmol/L KN-93 induced the cell growth reduction in a time-dependent manner from 78.27% at 8 h to 11.48% at 48 h. However, KN-92, an inactive derivative of KN-93, did not inhibit cell proliferation effectively. Moreover, analysis of cell cycle regulator expression revealed that KN-93 rather than KN-92 reduced the expression of p53 and p21. CONCLUSION： KN-93 has potent inhibitory effect on proliferation of LX-2 cells by modulating the expression of two special cell cycle regulators, p53 and p21.

关键词： KN-93 Human hepatic stellate cells LX-2 Cell proliferation

EXPERIMENTAL STUDY ON The HOT EMBOSSING POLYMER MICROFLUIDIC CHIP

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2008年第3期21卷 87-89页

作者： he yong FU Jianzhong CheN Zichen College of Mechanical and Energy Engineering Zhejiang Unviersity Hangzhou 310027 China

Experiments are used to study the fabrication of polymer microfluidic chip with hot embossing method. The pattern fidelity with respect to the process parameters is analyzed. Experiment results show that the relationship between the imprint temperature and the microchannel width is approximately exponential. However, the depth of micro channel isn＇t sensitive to the imprint temperature. When the imprint pressure is larger than 1 MPa and the imprint time is longer than 2 min, the increasing of imprint pressure and holding time has little impact on the microchannel width. So over long holding time is not needed in hot embossing. Based on the experiment analysis, a series of optimization process parameters is obtained and a fine microfluidic chip is fabricated. The electrophoresis separation experiment are used to verify the microfluidic chip performance after bonding. The results show that 100bp-ladder DNA sample can be separated in less than 5 min successfully.

关键词： Microfluidic chip Hot embossing Channel sizes Pattern fidelity