检索结果-南通市图书馆

One Dimensional Iron Molybdophosphate Anionic Chains with Different Structural Arrangements Reflecting a Flexibility Character

引用

Chemical Research in Chinese Universities 2013年第4期29卷 621-626页

作者： ZHOU Yun-shan HASSAN ul Sadaf LI Xian-qi ZHANG LI-juan AHMAD Waqar shi zong-hai State Key Laboratory of Chemical Resource Engineering Institute of Science Beij'ing University of Chemical Technology Beijing 100029 P. R. China

Structural comparison of a new compound [（bpp）3H6]Fe2ⅢFe2ⅡMo24Ⅴ（H2PO4）8（HPO4）4（PO4）4O48（OH）12·（H2O）4·2H2O（1）[bpp=1,3-di（4-pyridyl）propane] with our previously reported two compounds [（bpy）3FeⅡ]3·Fe2ⅢFe2ⅡMo24Ⅴ（H2PO4）8（HPO4）4（PO4）4O48（OH）12（H2O）4·12H2O（2） and [（bpy）3FeⅡ]2FeⅡFeⅢMo12Ⅴ（H2PO4）2（H2-xPO4）.（H1＋xPO4）（HPO4）2（PO4）2O24（OH）6（H2O）2·9H2O（x=0-1）（3）（bpy=2,2＇-bipyridine）,which all exhibit one-dimensional mixed-valence iron molybdophosphate anionic chains constructed by alternating connection of FeⅢ ions and magic [FeⅡ（Mo6P4O31）2] units,reveals that the non-hydrogen atomic ratios of Mo∶Fe∶P∶O within the polymeric anionic chains are the same for all the three compounds,while the polymeric anionic chains of the different compounds bear different numbers of negative *** therefore there exist different numbers of counter cations per {Fe2Ⅲ[Fe2Ⅱ（P16Mo24ⅤO124）]} unit found in the titled *** discloses that not only are the spatial assembling of counter cations and polymeric inorganic chains of three compounds quite different,but also the O-FeⅢ-O bond angles and FeⅢ-O bond lengths of the three different inorganic chains exhibit small *** is more important is that such small changes in bond length and bond angle in the assemblage of FeⅢ-O bonds lead to the considerable fluctuations of inorganic chains in their structural conformation within the three compounds,reflecting an interesting phenomenon of＂flexibility＂ in the pure inorganic one dimensional mixed-valence iron molybdophosphate chains.

关键词： Flexibility Conformation Crystal structure Inorganic chain Iron molybdophosphate

来源：

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

Chiral phase transition from the Dyson-Schwinger equations in a finite spherical volume

引用

Chinese Physics C 2019年第6期43卷 1-5页

作者： Ya-Peng Zhao Rui-Rui Zhang Han Zhang Hong-shi zong School of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China State Key Laboratory of Theoretical Physics Institute of Theoretical Physics CAS Beijing 100190 China Joint Center for Particle Nuclear Physics and Cosmology Nanjing 210093 China

Within the framework of the Dyson-Schwinger equations and by means of Multiple Reflection Expansion,we study the effect of finite volume on the chiral phase transition in a sphere, and discuss in particular its influence on the possible location of the critical end point(CEP). According to our calculations, when we take a sphere instead of a cube, the influence of finite volume on phase transition is not as significant as previously calculated. For instance,as the radius of the spherical volume decreases from infinite to 2 fm, the critical temperature T c, at zero chemical potential and finite temperature, drops only slightly. At finite chemical potential and finite temperature, the location of CEP shifts towards smaller temperature and higher chemical potential, but the amplitude of the variation does not exceed 20%. As a result, we find that not only the size of the volume but also its shape have a considerable impact on the phase transition.

关键词： finite volume effects Dyson-Schwinger equations chiral phase transition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fine tuning problem of the cosmological constant in a generalized Randall-Sundrum model

引用

Chinese Physics C 2020年第12期44卷 210-214页

作者： Guang-Zhen Kang De-Sheng Zhang Li Jun Hong-shi zong School of Science Yangzhou Polytechnic InstituteYangzhou 225127China Department of Physics Nanjing UniversityNanjing 210093China School of Science Changzhou Institute of TechnologyChangzhou 213032China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210093China State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsCASBeijing 100190China

To solve the cosmological constant fine tuning problem,we investigate an(n+1)-dimensional generalized Randall-Sundrum brane world scenario with two(n−1)-branes instead of two *** an anisotropic metric ansatz,we obtain the positive effective cosmological constantΩeff of order 10−124 and only require a solution≃50−***,both the visible and hidden branes are stable because their tensions are ***,the fine tuning problem can be solved quite ***,the Hubble parameter H1(z)as a function of redshift z is in good agreement with the cosmic chronometers *** evolution of the universe naturally shifts from deceleration to *** suggests that the evolution of the universe is intrinsically an extra-dimensional *** can be regarded as a dynamic model of dark energy that is driven by the evolution of the extra dimensions on the brane.

关键词： cosmological constant fine tuning extra dimensions Hubble parameter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quark Stars Investigated using an Improved Quasi-Particle Model

引用

Chinese Physics Letters 2012年第10期29卷 24-27页

作者： YAN Yan CAO Jing LUO Xin-Lian SUN Wei-Min zong Hong-shi Department of Physics Nanjing UniversityNanjing 210093 Department of Astronomy Nanjing UniversityNanjing 210093 Joint Center for Particle Nuclear Physics and CosmologyNanjing 210093

The equation of state(EOS)of cold and dense strongly interacting matter is crucial for better research of compact stars,i.e.,neutron stars and quark *** generalize our improved quasi-particle model from finite temperature and zero chemical potential[***.B 711(2012)65]to the case of zero temperature and finite chemical potential to obtain an EOS of our improved quasi-particle model and then apply this EOS to study the structure of a quark *** results are consistent with the most recent astronomical observational data.

关键词： quark finite quasi

来源：

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

Distribution of the Pan-African Domains in East Antarctica and Adjacent Areas

引用

Acta Geologica Sinica(English Edition) 2020年第S1期94卷 45-46页

作者： REN Liudong zong shi WANG Yanbin LI Chong Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China

The Pan-African event is widely distributed in East Antarctica craton. Many terranes or outcrops of the craton bear more or less signs of the event. From characteristics of the shear zones, granites, pegmatites, feature and time of high grade metamorphism and detrital zircon ages peaks of the downflowing sediments from the plateau, the Pan-African event in the East Antarctica and adjacent areas in the Gondwana reconstruction, like SE Africa, southern India and SW Australia, wasdistributed as special zones or areas in many localities, including both the coastal regions and interior of the East Antarctica. In geochemistry, the granites are generally anorogenic, ocassionally with some gabbros or dolerite dykes, showing sign of bi-modal feature. The water or fluid available along the shear zones were responsible for retrogression of the earlier, e.g., Grenville age, high grade outcrops to later Pan-African amphibolite facies metamorphism. Meanwhile, the Pan-African event has influenced most isotopic systems, including the U-Pb, Sm-Nd, Rb-Sr and Ar-Ar systems, giving younger apparent ages. Manifestation of the Pan-African event is distributed from possibly locally granitic magmatism, to wider medium-high grade metamorphism, and mostly widespread in resetting for some isotope systems, suggesting the prevailing thermal *** Gondwana formation, local depressions in the East Antarctica could be filled with sediments, implying the initial breakup period of the Rodinia. The later Pan-Gondwana counterrotating cogs shaped the interstitial fold belts between continent blocks and formed a set of shear zones. The mafic underplating in the Gondwana may be responsible for the widespread granites, pegmatites and more or less isotopic resetting due to strong thermal effect from the deep. That is, the Pan-African event is a possible response of the plate movement surrounding the continent swarms in the non-stable interior of theyet consolidated *** Pan-African event ma

关键词： Pan-African event distribution granite metamorphism East Antarctica

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Anisotropic evolution of 4-brane in a 6D generalized Randall-Sundrum model

引用

Chinese Physics C 2019年第9期43卷 101-107页

作者： Guang-Zhen Kang De-Sheng Zhang Long Du Jun Xu Hong-shi zong School of Science Yangzhou Polytechnic InstituteYangzhou 225127China Department of Physics Nanjing UniversityNanjing 210093China School of Science Changzhou Institute of TechnologyChangzhou 213032China School of Science Guangxi University of Science and TechnologyLiuzhou 545006China Joint Center for Particle Nuclear Physics and CosmologyNanjing 210093China State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsCASBeijing 100190China

We investigate a 6 D generalized Randall-Sundrum brane world scenario with a bulk cosmological *** stress-energy tensor Tabi on the brane is shown to be similar to a constant vacuum *** is consistent with the Randall-Sundrum model,in which each 3-brane Lagrangian yielded a constant vacuum *** adopting an anisotropic metric ansatz,we obtain the 5 D Friedmann-Robertson-Walker field *** a slightly later period,the expansion of the universe is proportional to the square root of time,t1/2,which is similar to the period of the radiation-dominated ***,we investigate the case with two a（t） and two b（t）.In a large range of t,we obtain the 3 D effective cosmological constant Λeff=-2Ω/3>0,which is independent of the integral ***,the scale factor is an exponential expansion,which is consistent with our present observation of the *** results demonstrate that it is possible to construct a model that solves the dark energy problem,while guaranteeing a positive brane tension.

关键词： brane induced cosmological constants anisotropy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Classical Dynamics of a Nucleon in Heavy Nuclei

引用

Chinese Physics Letters 1998年第5期15卷 318-320页

作者： GU Jian-zhong ZHAO En-guang ZHUO Yi-zhong WU Xi-zhen zong Hong-shi Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080 China Institute of Atomic Energy Beijing 102413

Within the framework of the two-center shell model,the classically dynamical behaviour of a nucleon in heavy nuclei is investigated when nuclear shape parameters are changed *** is found that there is a good quantum-classical correspondence of nucleonic regular(chaotic)motion so that Bohigas,Giannoni and Schmit conjecture is confirmed once again.

关键词： behaviour chaotic correspondence

来源：

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

Radio-Frequency Spectra of Ultracold Fermi Gases Including a Generalized GMB Approximation at Unitarity

引用

Chinese Physics Letters 2013年第11期30卷 18-21页

作者： RUAN Xiao-Xia GONG Hao DU Long JIANG Yu SUN Wei-Min zong Hong-shi Department of Physics Nanjing UniversityNanjing 210093 Faculty of Science Jiangsu UniversityZhenjiang 212013 Department of Mathematics and Physics Bengbu CollegeBengbu 233030 Center for Statistical and Theoretical Condensed Matter Physics Zhejiang Normal UniversityJinhua 321004 State Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190 Joint Center for Particle Nuclear Physics and CosmologyNanjing 210093

Taking into account the effect of the generalized Gor'kov and Melik-Barkhudarov(GMB)approximation,we calculate the radio-frequency spectra of balanced and homogeneous ultracold Fermi gases within the framework of the non-self-consistent T-matrix approximation at unitarity in the normal *** corresponding equations are numerically calculated on the real frequency axis *** is found that our results agree well with the experimental result of the radio-frequency spectroscopy[***.101(2008)140403].

关键词： phase Fermi approximation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Survey of the patients with cleft lip and palate in China who were funded for surgery by the Smile Train Program from 2000 to 2002

引用

Chinese Medical Journal 2006年第20期119卷 1695-1700页

作者： ZHOU Qiao-juan shi Bing shi zong-dao ZHENG Qian WANG Yan Department of Oral and Maxillofacial Surgery West China DentalSchool Sichuan University Chengdu 610041 China

Background Cleft lip （CL） and cleft palate （CP） are two of the most frequent congenital malformations. Many epidemiologic studies on this deformity have been conducted worldwide, often producing inconsistent results. This study assessed epidemiology and some genetic aspects of cleft lip and palate in a Chinese sample from the Smile Train Program and to compare with other methodologically sound surveys. Methods The general information, family history, classification of cleft and associated malformations of 8000 CL and CP surgery patients were analyzed. Results Of the 8000 cases, 7812 had complete data. The distribution of cleft types is 17.04% with CP, 23.39% with CL and 59.58% with cleft lip and palate （CLP）. Unilateral clefts were more common than bilateral, with unilateral to bilateral ratios bein 10.4 ： 1 for CL, and 3.42 ： 1 for CLP. The overall male： female ratio was 2.01 ： 1. Left sided defects were more common than right sided regardless of sex, 1.90 ： 1 for CL and 1.96 ： 1 for CLP. CLP and CL were more common in males than in females with sex ratios （SR） of 2.88 ： 1 and 1.85 ： 1 respectively, whereas CP was more common in females with SR of 0.76 ： 1. Associated malformations （2.89%）, involved 29 CP cases, 41 CL and 156 CLP. The frequency of associated malformations in CLP （3.35%） was higher than CL （2.24%） and CP （2.22%）（P〈0.05）. Patients with CP or CLP were born less often in the winter than in the summer （P〈0.05）. A history of family members having clefts occurred in 6.84% of patients. The proportion of CLP cases （7.56%） was significantly higher than that of CL cases （5.64%）（P〈0.05）. Conclusions The different types of clefts appeared in the highest proportion in CLP and lowest proportion in CP. Males are more common with CL and CLP and less common with CP. These characteristics are the same as those of other Chinese surveys but different from some European reports.

关键词： cleft lip cleft palate data collection epidemiology

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diurnal variation of number concentration and size distribution of ultrafine particles in the urban atmosphere of Beijing in winter

引用

Journal of Environmental Sciences 2007年第8期19卷 933-938页

作者： shi zong-bo HE Ke-bin YU Xue-chun YAO Zhi-liang YANG Fu-mo MA Yong-liang MA Rui JIA Ying-tao ZHANG Jie Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China. TSI Asia Pacific Beijing Representative Beijing 100084 China College of Earth Sciences Graduate University-of Chinese Academy of Sciences Beijing 100049 China

Number concentration and distribution of airborne particles in the size range 5.6 to 560 nm diameter were measured in Beijing for a 15-d period in winter 2005. Dally average number concentrations of nucleation mode （5.6-20 um）, Aitken mode （20-100 um）, and accumulation mode （100-560 um） particles, and total particles were 17500, 32000, 4000, and 53500 cm^-3, respectively. Average particle size distribution was monomodal with a mode diameter of about 40 um at night and bimodal with mode diameters of about 10 and about 40 um during the daytime. New particle formation events, which were connected to diurnal variation of nucleation mode particles, were observed in more than half of the observation days. The events often started around 10：00-11：00 Chinese Standard Time （CST） and ended up after 3-4 h. Concentrations of Aitken and accumulation mode particles increased from midnight and reached their maxima at about 10：00 CST, and then decreased and became the lowest in the afternoon. Analysis of diurnal cycles in traffic volume and meteorological parameters revealed that the accumulation of the particles in Aitken and accumulation modes in the morning was influenced by formation of an inversion and increase in vehicle emission, and dispersion of such particles in the afternoon was associated with more effective vertical mixing and higher wind speed.

关键词： fine particles nucleation mode Aitken mode new particle formation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：