检索结果-南通市图书馆

Population synthesis of ultra-compact X-ray binaries

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第11期12卷 1526-1534页

作者： chun-Hua Zhu Guo-Liang Lu zhao-Jun Wang School of Physical Science and Technology Xinjiang University Urumqi 830046 China

Ultra-compact X-ray binaries （UCXBs） are very interesting and impor- tant objects. By taking the population synthesis approach to the evolution of binaries, we carry out a detailed study of UCXBs. We estimate that there are - 5000-10000 UCXBs in the Galaxy, and their birthrates are - 2.6-7.5×10-4 yr-1. Most UCXBs are transient X-ray sources, but their X-ray luminosities are much lower than those of persistent sources. Therefore, the majority of observed UCXBs should be persistent sources. About 40% - 70% of neutron stars （NSs） in UCXBs form via an accretion- induced collapse from an accreting ONe white dwarf （WD）, 1%-10% of NSs in UCXBs form via core-collapse supernovae and others form via the evolution-induced collapse of a naked helium star. About 50% - 80% of UCXBs have naked helium star donors, 5% - 10% of UCXBs have HeWD donors, 15% - 40% of UCXBs have COWD donors and UCXBs with ONeWD indicates that the uncertainty mainly comes which develops in these systems. donors are negligible. Our investigation from evolution of the common-envelope

关键词： binaries: close -- stars: neutron -- X-rays: binaries

Responses of phospholipase D and lipoxygenase to mechanical wounding in postharvest cucumber fruits

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第6期11卷 443-450页

作者： Yu-ying zhao chun-lu QIAN Ji-cheng CHEN Yan PEng Lin-chun MAO Department of Food Science and Nutrition College of Biosystem Engineering and Food Seience Zhejiang University Hangzhou 310029 China College of Horticulture and Gardening Yangtze University Jingzhou 434025 China

This study was to investigate the responses of phospholipase D（PLD） and lipoxygenase（LOX） to mechanical wounding in postharvest cucumber（Cucumis sativus ***-2） ***-associated Ca2＋ content,activities and gene expression of PLD and LOX,and contents of phosphatidylcholine（PC）,phosphatidylinositol（PI）,and phosphatidic acid（PA） were determined in cucumber fruits following mechanical *** show that PLD and LOX activities increased with the PLD and LOX mRNAs which are upregulated upon wounding,while membrane-associated Ca^2＋ content *** with the increase of PLD and LOX activities,accumulation of PA and losses of PC and PI were observed in all fruits,but there were differences of degrees between wounded and control *** suggest that PLD and LOX might be the main hydrolytic enzymes of phospholipids in postharvest cucumber fruits participating in the mechanical wounding *** activation of PLD and LOX might be the result of gene expression,which could be This study was to investigate the responses of phospholipase D（PLD） and lipoxygenase（LOX） to mechanical wounding in postharvest cucumber（Cucumis sativus ***-2） ***-associated Ca^2＋ content,activities and gene expression of PLD and LOX,and contents of phosphatidylcholine（PC）,phosphatidylinositol（PI）,and phosphatidic acid（PA） were determined in cucumber fruits following mechanical *** show that PLD and LOX activities increased with the PLD and LOX mRNAs which are upregulated upon wounding,while membrane-associated Ca2＋ content *** with the increase of PLD and LOX activities,accumulation of PA and losses of PC and PI were observed in all fruits,but there were differences of degrees between wounded and control *** suggest that PLD and LOX might be the main hydrolytic enzymes of phospholipids in postharvest cucumber fruits participating in the mechanical wounding *** activation of PLD and LOX might be

关键词： Cucumber Mechanical wounding Phospholipase D Lipoxygenase Phospholipid

Contribution of dust produced by binary merger ejecta

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第1期15卷 55-63页

作者： zhao-Jun Wang chun-Hua Zhu Guo-Liang Lü School of Physical Science and Technology Xinjiang University

By means of a population synthesis code and by constructing a simple toy model of dust produced by asymptotic giant branch（AGB） stars, common envelope（CE） ejecta and binary merger ejecta, we estimate the dust product rates（DPRs） of these processes in the Milky Way. The total DPR from AGB stars is～ 6.7 × 10-4M yr-1, in which about 73% of dust grains are carbon, 24% are silicates and 3% are iron. The total DPR from CE ejecta is ～ 4.2 × 10-4M yr-1, in which about 83% of dust grains are silicates, about 12% are carbon and 5% are *** DPR from binary merger ejecta is less than 1/3 that from AGB stars or CE ejecta,and it could even be negligible under certain circumstances. Therefore, compared with AGB stars and CE ejecta, the contribution of dust produced by binary merger ejecta to total dust grains in the Milky Way is smaller or can be negligible.

关键词： binaries: close stars: evolution circumstellar matter dust

A Class of Stable and Conservative Finite Difference Schemes for the Cahn-Hilliard Equation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2015年第4期31卷 863-878页

作者： Ting-chun WAng Li-mei zhao Bo-ling GUO School of Mathematics and Statistics Nanjing University of Information Science and Technology Institute of Applied Physics and Computational Mathematics

In this paper, we propose a class of stable finite difference schemes for the initial-boundary value problem of the Cahn-Hilliard equation. These schemes are proved to inherit the total mass conservation and energy dissipation in the discrete level. The dissipation of the total energy implies boundness of the numerical solutions in the discrete H1 norm. This in turn implies boundedness of the numerical solutions in the maximum norm and hence the stability of the difference schemes. Unique existence of the numerical solutions is proved by the fixed-point theorem. Convergence rate of the class of finite difference schemes is proved to be O（h2 ＋ r2） with time step T and mesh size h. An efficient iterative algorithm for solving these nonlinear schemes is proposed and discussed in detail.

关键词： Cahn-Hilliard equation finite difference scheme conservation of mass dissipation of energy convergence iterative algorithm

Stability for the Timoshenko Beam System with Local Kelvin-Voigt Damping

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2005年第3期21卷 655-666页

作者： Hong Liang zhao Kang Sheng LIU chun Guo ZHAng Department of Mathematics Zhejiang University Hangzhou 310027 P. R. China Department of Mathematics Northeast Normal University Changchun 130024 P. R. China

In this paper, we consider a vibrating beam with one segment made of viscoelastic material of a Kelvin-Voigt （shorted as K-V） type and other parts made of elastic material by means of the Timoshenko model. We have deduced mathematical equations modelling its vibration and studied the stability of the semigroup associated with the equation system. We obtain the exponential stability under certain hypotheses of the smoothness and structural condition of the coefficients of the system, and obtain the strong asymptotic stability under weaker hypotheses of the coefficients.

关键词： Timoshenko beam Kelvin-Voigt damping Semigroup Stability

Cyr61 Alleviates Cholangitis by Inhibiting Cytotoxic Effects of CD8^(+) T Cells on Biliary Epithelial Cells

在线全文

学校读者我要写书评

暂无评论

Current Medical Science 2021年第6期41卷 1205-1213页

作者： Tiao-chun CHEng Han LI xi LUO Lin-ling JU Lin CHEN Jian-guo SHAO Yong-jun SHE Min LI zhao-lian BIAN Medical School of Nantong University Nantong 226006China Nantong Institute of Liver Disease Nantong Third People’s Hospital Nantong UniversityNantong 226006China Department of Gastroenterology and Hepatology Nantong Third People’s HospitalNantong UniversityNantong 226006China Department of Anesthesiology Nantong Third People’s HospitalNantong UniversityNantong 226006China

Objective:Primary biliary cholangitis(PBC)is a chronic progressive cholestatic liver *** recent years,researchers have found that cysteine-rich angiogenic inducer 61(Cyr61,also known as CCN1)has a potential role in reducing portal inflammation in patients with *** study aimed to explore the relationship between Cyr61 and PBC to provide new ideas and an experimental basis for the clinical treatment of ***:After induction of the overexpression of Cyr61 in a mouse model of PBC using recombinant adenovirus,hematoxylin and eosin staining and pathological scores were used to indicate intrahepatic inflammation and bile duct ***-time PCR was used to detect changes in inflammation-related cytokines in the *** further study the mechanism,we assessed whether Cyr61 protects bile duct epithelial cells from cytotoxic ***:Serum and hepatic Cyr61 levels were increased in the murine model of *** of Cyr61 alleviated hepatic inflammation and bile duct injury in ***61 inhibited the cytotoxic effects of CD8^(+)T cells by acting on biliary epithelial cells(BECs)in ***:Our results provide novel insight into the pathogenesis of PBC and suggest that Cyr61 plays a dominant role in the cytotoxic effects on BECs in ***,therapeutic strategies targeting Cyr61 could be a potent therapy for PBC.

关键词： cysteine-rich angiogenic inducer 61 primary biliary cholangitis inflammation bile duct damage cytotoxicity

Density Functional Studies on Isonicotinato Lead(II) Complex [Pb(C_5H_4NCOO)_2]

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 Structural Chemistry 2006年第6期25卷 657-662页

作者： zhao Pu-Su JIAN Fang-Fang LI chun-Lei ZHEng Jian Department of Chemistry Huaiyin Teachers＇College Huaian Jiangsu 223001 China New Materials ＆ Function Coordination Chemistry Laboratory Qingdao University of Science and Technology Qingdao Shandong 266042 China

The title compound of isonicotinato lead（Ⅱ） [Pb（C5H4NCOO）2] has been optimized at B3LYP/LANL2DZ level of theory and calculated results show that the lead（Ⅱ） ion adopts 4-coordinate geometry. Atomic charge distributions indicate that during forming the title compound, each isonicotinic acid ion transfers -0.452 e to lead（Ⅱ） ion. The electronic spectra calculations show that there exist two absorption bands and the electronic transitions are mainly derived from the contribution of intraligand π→π^＊ transition and ligand-to-metal charge transfer （LMCT） transition. The thermodynamic properties of the title compound at different temperatures have been calculated and corresponding relations between property and temperature have also been obtained. The calculation of the second order optical nonlinearity was carried out, and the molecular hyperpolarizability was 3.62365^＊10^-30 esu.

关键词： isonicotinato lead(Ⅱ) complex density functional theory electronic spectra thermal property analysis the second order optical nonlinearity

Carbon and few-layer MoS2 nanosheets co-modified TiO2 nanosheets with enhanced electrochemical properties for lithium storage

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2018年第2期37卷 107-117页

作者： Hui-Hui Lu chun-Sheng Shi Nai-Qin zhao En-Zuo Liu chun-Nian He Fang He Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China

Carbon and few-layer MoS2 nanosheets co- modified TiO2 nanocomposites （defined as MoS2-C@TiO2） were prepared through a facile one-step pyrolysis reaction technique. In this unique nanostructure, the TiO2 nanosh- eets with stable structure serve as the backbones, and carbon coating and few-layer MoS2 tightly adhere onto the surface of the TiO2. It needs to be pointed out that the carbon coating improves the overall electronic conductivity and the few-layer MoS2 facilitates the diffusion of lithium ions and offers more active sites for lithium-ion storage. As a result, when evaluated as lithium-ion battery anodes, the MoS2-C@TiO2 nanocomposites exhibit markedly enhanced lithium storage capability compared with pure TiO2. A high specific capacity of 180 mA.h.g-1 has been achieved during the preliminary cycles, and the specific capacity can maintain 160 mA.h.g-1 at a high current density of 1C （1C=167 mA.g-1） even after 300 discharge/ charge cycles, indicating the great potential of the MoS2- C@TiO2 on energy storage.

关键词： Few-layer MoS2 nanosheets Carbon Co-modified TiO2 nanosheets Lithium-ion battery anodes

A retroactive approach to microgrid real-time scheduling in quest of perfect dispatch solution

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1608-1618页

作者： Youwei JIA Xue LYU chun Sing LAI zhao XU Minghua CHEN Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical Engineering School of AutomationGuangdong University of TechnologyGuangzhouChina School of Civil Engineering Faculty of EngineeringUniversity of LeedsLeedsUK The Chinese University of Hong Kong Hong KongChina

As an emerging paradigm in distributed power systems,microgrids provide promising solutions to local renewable energy generation and load demand ***,the intermittency of renewables and temporal uncertainty in electrical load create great challenges to energy scheduling,especially for small-scale *** of deploying stochastic models to cope with such challenges,this paper presents a retroactive approach to real-time energy scheduling,which is prediction-independent and computationally *** case studies were conducted using 3-year-long real-life system data,and the results of simulations show that the cost difference between the proposed retroactive approach and perfect dispatch is less than 11%on average,which suggests better performance than model predictive control with the cost difference at 30%compared to the perfect dispatch.

关键词： Microgrid Renewables Real-time scheduling Perfect dispatch Grid integration