检索结果-南通市图书馆

Thermal Characterization and Decomposition Kinetics of Free Anthraquinones from Rhubarb

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第5期17卷 699-702页

作者： li Ming zhang Xia li Yu jie DAI College of Bioengineering Tianjin University of Science ＆ Technology Tianjin 300222

The thermal behaviour of aloe-emodin, chrysophanol and physcion and their kinetics have been investigated under non-isothermal conditions by means of differential thermal analysis （DTA） and thermogravimetry （TG）. The thermal characteristics have been determined using the DTA and TG-DTG curves. The non-isothermal kinetic data were analyzed by means of the Achar method and the Madhusudanan-Krishnan-Ninan （MKN） method. The possible reaction mechanisms have been investigated by comparing the kinetic parameters. The kinetic equation for aloe-emodin, chrysophanol and physcion can be expressed as dα/dt=Aexp（-E/RT）1/3（1-α）[-In（1-α]2. The activation energy E （kJ mol^-1） of the three free anthraquinones are 78.09, 89.54, and 107.5 and their InA/s^-1 are 22.98, 36.85 and 43.60, respectively.

关键词： Aloe-emodin chrysophanol physcion thermogravimetry (TG) differential thermoanalysis (DTA) non-isothermal kinetics.

Research on graphite powders used for HTR-PM fuel elements

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 347-350页

作者： ZHAO Hongsheng liANG Tongxiang zhang jie li Ziqiang TANG Chunhe Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China

Different batches of natural graphite powders and electrographite powders were characterized by impurity, degree of graphitization, particle size distribution, specific surface area, and shape characteristics. The graphite balls consist of proper mix-ratio of natural graphite, electrographite and phenolic resin were manufactured and characterized by thermal conductivity, anisotropy of thermal expansion, crush strength, and drop strength. Results show that some types of graphite powders possess very high purity, degree of graphitization, and sound size distribution and apparent density, which can serve for matrix graphite of HTR-PM. The graphite balls manufactured with reasonable mix-ratio of graphite powders and process method show very good properties. It is indicated that the properties of graphite balls can meet the design criterion of HTR-PM. We can provide a powerful candidate material for the future manufacture of HTR-PM fuel elements.

关键词： high temperature gas-cooled reactor graphite powder design criterion

Fermionic Zero Modes in Gauge and Gravity Backgrounds on a Sphere

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第6期49卷 1577-1579页

作者： liU Yu-Xiao zhang li-jie DUAN Yi-Shi Institute of Theoretical Physics Lanzhou University Lanzhou 730000 China Department of Physics Shanghai University Shanghai 200444 China

In this letter we study fermionic zero modes in gauge and gravity backgrounds taking a two-dimensional compact manifold S2 as extra dimensions. The result is that there exist massless Dirac fermions which have normalizable zero modes under quite general assumptions about these backgrounds on the bulk. Several special cases of gauge background on the sphere axe discussed and some simple fermionic zero modes are obtained.

关键词： extra dimensions fermionic zero modes

Metabolic Regulation of Mammary Gland Epithelial Cells of Dairy Cow by Galactopoietic Compound Isolated from Vaccariae segetalis

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2011年第7期10卷 1106-1116页

作者： TONG Hui-li GAO Xue-jun li Qing-zhang liU jie li Nan WAN Zhong-ying Key Laboratory of Dairy Science Ministry of Education/Life College Northeast Agricultural University Harbin 150030 P.R.China

In previous experiment, we isolated a compound dibutyl phthalate （DBP） from Vaccaria segetalis which had galactopoietic function on mammary gland epithelial cells of dairy cow （DCMECs）. In this experiment, we ascertained the metabolic regulation function of DBP on DCMECs. Many genes related to lactation including Stat5, AMPK, b-casein, Glut1, SREBP-1, PEPCK, and ACC were detected by real-time PCR. Furthermore, Stat5 and AMPK were detected by Western blot and immunofluorescence co-localization, respectively. The results showed that DBP stimulates the expression of Stat5 and p-Stat5, thus activates Stat5 cell signal transduction pathway and stimulates b-casein synthesis. DBP also raises the activities of Glut1 and AMPK to stimulate glucose uptake and glycometabolism and activates the expression of AMPK downstream target genes PEPCK and ACC and expression of SREBP-1 to stimulate milk fat synthesis. In addition, the activities of HK, G-6-PDH, ICDH, ATPase, and energy charges were stimulated by DBP to increase the energy metabolism level of DCMECs. The results showed DBP stimulates energy metabolism related to galactopoietic function in DCMECs.

关键词： Vaccaria segetalis DBP dairy cow mammary gland epithelial cell metabolic regulation

Statistics of Leaders in Index-Driven Networks

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第5期30卷 183-186页

作者： zhang Yong JU Xian-Meng zhang li-jie XU Xin-Jian Department of Mathematics Shanghai UniversityShanghai 200444 State key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876 Department of Physics Shanghai UniversityShanghai 200444 Institute of System Sciences Shanghai UniversityShanghai 200444

We study the statistical properties of leaders in growing networks with age.A leader of a network is defined as the node with the largest degree and the age of the node is trivially labeled by its index,i.e.,the time it joins the *** networks evolve with the addition of new nodes connecting to old ones with the possibility that is proportional to the index of the target,we investigate both the average number and index of leaders as well as the degree distribution of *** average number of leaders first increases quickly with time and then saturates to a finite value and the average index of leaders increases algebraically with *** features result from the degree distribution with an exponential *** calculations based on the rate equation are verified by numerical simulations.

关键词： trivial algebraic connecting

Analytical solution for wave-induced response of isotropic poro-elastic seabed

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

Science China(Technological Sciences) 2010年第10期53卷 2619-2629页

作者： zhang Yongli & li jie Department of Building Engineering, Tongji University, Shanghai 200092, China 1. Department of Building Engineering Tongji University Shanghai 200092 China

By use of separation of variables,the governing equations describing the Biot consolidation model is firstly transformed into a complex coefficient linear homogeneous ordinary differential equation,and the general solution of the horizontal displacement of seabed is constructed by employing a complex wave number,thus,all the explicit analytical solutions of the Biot consolidation model are determined. By comparing with the experimental results and analytical solution of Yamamoto etc. and the analytical solution of Hsu and Jeng,the validity and superiority of the suggested solution are verified. After investigating the influence of seabed depth on the wave-induced response of isotropic poro-elastic seabed based on the present theory,it can be concluded that the influence depth of wave-induced hydrodynamic pressure in the seabed is equal to the wave length.

关键词： linear wave dynamic water pressure seabed analytical solution Biot consolidation model

Group separation of coal components and new ideas of coal utilization as petroleum

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2009年第5期19卷 636-641页

作者： QIN Zhi-hong HOU Cui-li CHEN Juan zhang li-ying MA jie-qiong School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou Jiangsu 221116 China

Four different groups of components were separated from coal under mild conditions of extraction and stripping process. Within these groups, and with pre-separation, individual utilization of all coal components can be realized, similar to petroleum components and enhance the inherent value and utilization value of coal, as well as increase environmental benefits. The characteristics of each component were analyzed with measurements by FTIR, GC/MS, TEM and the establishment of caking properties. The results show that coal can be separated into residues, ultra-pure coal, asphaltene components and light components by adding solvents for stripping into the CS2/NMP mixed extraction solution. Those four groups of components present great differences in the presence of carbon and hydrogen elements, in the structure of functional groups, in their macroscopic structure and micro-morphology and caking properties. Every component possesses its own inherent values and approaches. A new idea of coal processes and utilization, similar to the use of petroleum is proposed.

关键词： coal group components separation similarity to petroleum process and utilization

Evaluation of Colloidal Gold Immunochromatography for the Diagnosis of Human Brucellosis Caused by Smooth Brucella

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2022年第8期35卷 764-767页

作者： DONG Shuai Bing TA Na WANG li Ping FAN Meng Guang li Yue Xi zhang Cui Hong zhang li jie WANG Zi Jun JIANG Hai Bejing Center for Disease Prevention and Control Bejing 100013China Inner Mongolia Autonomous Region Comprehensive Center for Disease Control and Prevention Hohhot 010031Inner Mongolia AutonomousChina Chinese Center for Disease Control and Prevention Beijing 102206China Wulanchabu City Center for Endemic Disease Prevention and Control Wulanchabu 012000Inner Mongolia AutonomousChina State Key Laboratory for Infectious Disease Prevention and Control Collaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesNational Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and PreventionBejing 102206China

Brucellosis is an infectious allergic zoonotic disease caused by bacterial species in the genus Brucella. It is a Class B infectious disease according to the Law on the Prevention and Control of Infectious Diseases in China. According to the World Health Organization, brucellosis is currently a highly neglected zoonotic disease. Despite this, more than 170 countries have reported cases of brucellosis, and approximately 500,000 new cases are reported each year.

关键词： allergic cases neglected

A Cross-Multi-Domain Trust Assessment Authority Delegation Method Based on Automotive Industry Chain

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2025年第1期82卷 407-426页

作者： Binyong li liangming Deng jie zhang Xianhui Deng School of Cybersecurity(Xin Gu Industrial College) Chengdu University of Information TechnologyChengdu610225China Advanced Cryptography and System Security Key Laboratory of Sichuan Province Chengdu610225China SUGON Industrial Control and Security Center Chengdu610225China

To solve the challenges of connecting and coordinating multiple platforms in the automotive industry and to enhance collaboration among different participants,this research focuses on addressing the complex supply relationships in the automotive market,improving data sharing and interactions across various platforms,and achieving more detailed integration of data and *** propose a trust evaluation permission delegation method based on the automotive industry *** proposed method combines smart contracts with trust evaluation mechanisms,dynamically calculating the trust value of users based on the historical behavior of the delegated entity,network environment,and other factors to avoid malicious node attacks during the permission delegation *** also introduce strict control over the cross-domain permission granting and revocation mechanisms to manage the delegation path,prevent information leakage caused by malicious node interception,and effectively protect data integrity and *** analysis shows that this method meets the realtime requirements of collaborative interaction in the automotive industry chain and provides a feasible solution to permission delegation issues in the automotive industry chain,offering dynamic flexibility in authorization and scalability compared to most existing solutions.

关键词： Automotive industry chain cross-domain access block chain delegate authority trust assessment