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Optimization of the imaginary time step evolution for the Dirac equation

Science china(Physics,Mechanics & Astronomy) 2011年第2期54卷 231-235页

作者： LI FangQiong1,ZHANG Ying2,LIANG HaoZhao2,3 & MENG Jie4,2,5 1Guizhou university for nationalities,Guiyang 550025,china 2State Key Lab Nuclear Physics & Technology,school of Physics,Peking university,Beijing 100871,china 3Institut de Physique Nucle’aire,IN2P3-CNRS and Universite’ Paris-Sud,F-91406 Orsay Cedex,France 4school of Physics and Nuclear Energy Engineering,Beihang university,Beijing 100191,china 5Department of Physics,university of Stellenbosch,Stellenbosch,South Africa 1. Guizhou university for nationalities Guiyang 550025 China2. State Key Lab Nuclear Physics & Technology School of Physics Peking University Beijing 100871 China3. Institut de Physique Nucléaire IN2P3-CNRS and Université Paris-Sud F-91406 Orsay Cedex France4. School of Physics and Nuclear Energy Engineering Beihang University Beijing 100191 China5. Department of Physics University of Stellenbosch Stellenbosch South Africa

Taking the single neutron levels of 12C in the Fermi sea as examples,the optimization of the imaginary time step(ITS) evolution with the box size and mesh size for the Dirac equation is *** the weakly bound states,in order to reproduce the exact single-particle energies and wave functions,a relatively large box size is *** long as the exact results can be reproduced,the ITS evolution with a smaller box size converges faster,while for both the weakly and deeply bound states,the ITS evolutions are less sensitive to the mesh ***,one can find a parabola relationship between the mesh size and the corresponding critical time step,i.e.,the largest time step to guarantee the convergence,which suggests that the ITS evolution with a larger mesh size allows larger critical time step,and thus can converge faster to the exact *** conclusions are very helpful for optimizing the evolution procedure in the future self-consistent calculations.

关键词： Dirac equation Schrdinger-like equation imaginary time step method convergence

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EXISTENCE OF GLOBAL SMOOTH SOLUTION TO INITIAL BOUNDARY VALUE PROBLEM FOR A VISCOELASTIC MODEL WITH RELAXATION

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Acta Mathematica Scientia 2004年第2期24卷 265-274页

作者：阮立志朱长江 LaboratoryofNonlinearAnalysis Dept.ofMath.CentralChinaNormalUniversityWuhan430079China

This paper is concerned with the initial boundary value problem for a viscoelastic model with relaxation. Under the only assumption that the C^0-norm of the initial data is small, without smallness hypothesis for the C^1-norm, the existence of the global smooth solution to the corresponding initial boundary value problem is proved. The analysis is based on some a priori estimates obtained by the 'maximum principle' of first-order quasilinear hyperbolic system.

关键词： Viscoelastic model relaxation a priori estimates maximum principle

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Independent regulation of curvature of penta-lobed stigmas in Kosteletzkya virginica (Malvaceae)

Independent regulation of curvature of penta-lobed stigmas i...

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全国系统与进化植物学研讨会暨第九届系统与进化植物学青年研讨会

作者： RUAN Cheng-Jiang Institute of Bio-Resources and Environment, College of Life Science, dalian nationalities university, dalian 1.6600, china

In halophyte Kosteletzkya virginica flowers, if stigmas are not pollinated, the penta-lobed stigmas curve with the process of flowering and touch its own anthers at the end of flowering. In the process of the curvature of unpollinated lobes, if 1-4 of penta-lobed stigmas receives pollen and stops to curve, other unpollinated lobes still keep the curvature. The percentage of stigmas contacting their own anthers by the lobed curvature is influenced by weather conditions, it is significantly lower in sunny (18.64 % ± 1.61 %, n = 37) than in cloudy or rainy days (70.58 %±2.06 %, n = 23). The lobed curvature will stop permanently once one stigma will pollinated by the amount of pollen grains of 30.96±0.94 (n = 612), ranging from 1 to 162 pollen grains. The application of various pollen grains to 1-4 of five stigmas does not inhibit the .curvature of other unpollinated lobes. There are significant differences among pollen deposition, fruit sets and seeds per capsule of the flowers with different stigma number. All these indicate that the curvature of each of penta-lobed stigmas in K. virginica is regulated independently.

关键词： Kosteletzkya virginica Penta-lobed stigmas Lobe curvature Independent regulation

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Characterization of a novel compound from Burkholderia cepacia and its antifungal activity against Fusarium solani assessed by fluorescent staining

Characterization of a novel compound from Burkholderia cepac...

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2008年中国微生物学会学术年会

作者： Xin Li,~(1,2) Chun-Shan Quan,~(3*) Jian-Hua,Wang~(1,2) and Sheng-Di Fan~3 ~1 dalian Institute of Chemical Physics,Chinese Academy of sciences,457 Zhong-shan Road, dalian,116023,china ~2 Graduate university of the Chinese Academy of sciences,Beijing,100049,china ~3 Life Science College,dalian nationalities university,Economical and Technological Development Zone,dalian,1.6600,china

During the research for antagonists of pathogenic fungi,a novel antifungal compound (named as CF66I) produced by Burkholderia cepacia CF-66 was isolated and purified. Chemical analysis revealed that this compound is not protein,polypeptide or polysaccharide,but contains ***66I is a high-molecular-weight compound (22-25 kDa) with small amounts of C,H and N;these characteristics are different

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Relationships between bacterial-algal proliferating and mass extinction in the Late Devonian Frasnian-Famennian transition:Enlightening from carbon isotopes and molecular fossils

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Science china Earth sciences 2005年第10期48卷 1656-1665页

作者： GONG Yiming1,2, XU Ran1, TANG Zhongdao1, SI Yuanlan3 & LI Baohua4 1. Faculty of Earth Science and State Key Laboratory of Geological Processes and Mineral Resources, china university of Geosciences, Wuhan 430074, china 2. Institute of Resources & Environments, Henan Polytechnic university, Jiaozuo 454003, china 3. Department of Computer Science, South-Central university for nationalities, Wuhan 430074, china 4. Laboratory of Marine Geology, Tongji university, Shanghai 200092, china Faculty of Earth Science and State Key Laboratory of Geological Processes and Mineral Resources china university of Geosciences Wuhan china Institute of Resources & Environments Henan Polytechnic university Jiaozuo china Department of Computer Science South-Central university for nationalities Wuhan china Laboratory of Marine Geology Tongji university Shanghai china

Studies show positive shifts of inorganic and organic carbon isotope values (δ 13Ccarb and δ 13Ckerogen) from +0.43 (‰ V-PDB) to +3.54 (‰ V-PDB) and from ?29.38 (‰ V-PDB) to ?24.14 (‰ V-PDB), respectively, B* (Ba* = Ba/ (Al2O3 X 15%)) values from 0.015 to 0.144, TOC values from 0.02% to 0.21%, V/Cr values from 0.3 to 2.0, Sr/Ba values from 3.20 to 49.50 in the Late Devonian Frasnian Upper rhenana zone to the top linguiformis zone of the Yangdi sec-tion deposited in carbonate slope facies of Guilin, Guangxi, South china, which indicates that biomass, productivity, organic carbon burial and salinity increase and that oxygenation near the boundary between sediments and waters decreases from the Late Devonian Frasnian Upper rhenana zone to the top linguiformis zone. Abundance of molecular fossils increases and normal alkanes, isoprenoid hydrocarbon, terpanes and steranes are dominated from the Late Devonian Frasnian to the bottom of Famennian, which shows that the predecessors of molecular fossils of the Frasnian-Famennian (F-F) transition are dominated by marine phytoplankton, zooplankton and benthic bacteria with no photosynthesis. Therefore, it is considered that the F-F transitional mass extinction with a multistage, selection and global synchronizing was caused by bacte-rial-algal proliferating, continuing deterioration of the shallow marine ecoenvironment of the mid-dle-lower latitudes. A simple cause and effect chain can be expressed as: appearance of seed plants and multi-storied forests → enhanced chemical and biochemical weathering and pe-dogenesis → wide development of soils → increasing riverine nutrient fluxes in epicontinental sea → from superoligotrophic to eutrophic in epicontinental sea → proliferating of marine phyto-plankton and zooplankton → frequent red tide and anoxia → mass extinction of shallow marine organisms in the middle-lower latitudes. It is worth notice that the factor drawdown of atmos-pheric Pco2, climatic cooling and sea level falling c

关键词： mass extinction, bacteria-algae, carbon isotopes, molecular fossils, biodiversity, Late Devonian, Guangxi, South china.

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我国少数民族文字期刊的现状及发展趋势

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图书情报工作 2003年第6期47卷 110-113页

作者：王学艳大连民族学院图书馆大连116600

分析研究我国少数民族文字期刊的数量分布、出版频率及报道的学科内容情况等,阐明少数民族文字期刊的特点及其发展趋势。

关键词：少数民族文字期刊数量地区分布出版频率学科内容发展趋势

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Approach to the Relation of Mutual-Feed Joint-Variation in Groundwater Management Model

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Journal of Earth Science 2012年第3期23卷 349-358页

作者：李平卢文喜靳孟贵杨青春 College of Chemistry and Materials South-Central University for Nationalities school of Environmental Studies China University of Geosciences College of Environment and Resources Jilin University

In groundwater management,the exchanges between groundwater and other water such as surface water and spring water need to be *** exchange is dependent on the ground-water level,which is called *** pumping rate,groundwater level,and covariate interact and the relation of mutual-feed joint-variation is used to describe their *** article presents a new approach of dealing with the relation in groundwater management *** mathematical for-mulation of the relation,as an additional equality constraint in the optimization model,is developed using response matrix *** the groundwater management model with covariate is set *** code for the simulation and management of groundwater system with covariate is programmed with Fortran 90,and the optimal pumping rate,groundwater level,and covariate are *** approach is verified with a hypothetical ***,the approach is applied to the groundwater management of Qianguo（前郭） area in western Jilin（吉林） *** results indicate that the ap-proach is *** provides a universal solution for various covariates and reduces the computational complexity compared to iteration *** approach is proven to be very efficient to solve ground-water management problem with covariate.

关键词： covariate relation of mutual-feed joint-variation groundwater management response matrix

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On Reverses of the L_p-Busemann-Petty Centroid Inequality and Its Applications

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Wuhan university Journal of Natural sciences 2010年第4期15卷 292-296页

作者： WANG Weidong1,2 1. Department of Mathematics, china Three Gorges university, Yichang 443002, Hubei, china 2. Department of Mathematics, Hubei university for nationalities, Enshi 445000, Hubei, china Department of Mathematics China Three Gorges University Yichang Hubei China Department of Mathematics Hubei University for Nationalities Enshi Hubei China

In this paper,the reverse forms of the L p-Busemann-Petty centroid inequality are shown. As the applications of the reverse forms,we obtain the reverse forms of the L p-centroid-affine inequality and an upper bound of... 详细信息

关键词： convex body reverse form L p-Busemann-Petty centroid inequality L p-centroid-affine inequality isotropic constant

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TWO-DIMENSIONS POSITION ENCODED AND RECOGNITION TECHNOLOGY

TWO-DIMENSIONS POSITION ENCODED AND RECOGNITION TECHNOLOGY

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2009 2nd IEEE International Conference on Computer Science and Information Technology（ICCSIT 2009）

作者： Jun-xing zhang Li-xin shi Ji-yin zhao Dept.of Electromechanical and Information Engineering dalian nationalities university dalian china

Digital levels is typical product which using image processing to compete position measurement,but the encoded in digital levels is one-dimension position encoded.A surface positioning method based on two-dimension encoded recognition is *** structure of pen-type coding image detection system is *** order to complete position encoding the non-continuous code area coding and incremental coding methods are put forward and *** this system,we get position coordinates by the process of coding *** image process steps and recognition method are *** method can be applied to the development of interactive electronic whiteboard and computer input device.

关键词： position measurement two-dimensions encode photoelectric detection encode image recognition

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Community Tourism as Practiced in the Mountainous Qiang Region of Sichuan Province,china-a Case Study in Zhenghe Village

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Journal of Mountain Science 2008年第2期5卷 140-156页

作者： ZHOU Lianbin LIU Kaibang Southwest Institute for nationalities Research Southwest University for Nationalities Sichuan China

In china, community tourism is still a relatively new phenomenon, but the villagers of a small Qiang village in the Qiang Autonomous County of Beichuan in Southwestern Sichuan have initiated tourism in a way which conforms to the basic theory of community tourism development. This demonstrates that community tourism possesses a strength and vitality that can promote the development of tourism in the rural and mountainous areas. In the district of Zhenghe Village, the tourism industry, based on the community tourism model, is the mainstay of its economy. The practice of community tourism in the village not only promotes the economic development of the village community, but also leads to the protection of the mountainous natural environment and of the culture of the Qiang people. This paper investigates the development process of community tourism in Zhenghe and shows how the local residents participate in this process. It also looks at how profits have been distributed within the community. It demonstrates that community tourism is a correct choice by the Zhenghe people as they have dearly been moving from poverty to prosperity, while the local ecology and environment have been simultaneously protected. The authors hope that other minority villages with similar local conditions and natural resources will be able to use this example to develop their own community tourism.

关键词： Community protection Qiang minority Sichuan china tourism environmental region Zhenghe Village

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