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Search Results: 1 - 10 of 54896 matches for " GE Jian-ping "
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Temperature Dependent Motion of a Massive Quantum Particle  [PDF]
Jian-Ping Peng
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.37083
Abstract: We report model calculations of the time-dependent internal energy and entropy for a single quasi-free massive quantum particle at a constant temperature. We show that the whole process started from a fully coherent quantum state to thermodynamic equilibrium can be understood, based on statistics of diffracted matter waves. As a result of thermal interaction between the particle and its surroundings, the motion of the particle shows new feature.
Entropy of a Free Quantum Particle  [PDF]
Jian-Ping Peng
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.312241
Abstract: The time-dependent entropy of a single free quantum particle in the non-relativistic regime is studied in detail for the process started from a fully coherent quantum state to thermodynamic equilibrium with its surroundings at a finite temperature. It is shown that the entropy at the end of the process converges to a universal constant, as a result of thermal interaction.
Vegetation water conservation effect in the Jinghe River basin: An analysis based on to pography and soil type
基于地形和土壤的泾河流域植被生态系统保水效益分析

BI Xiao-li,GE Jian-ping,
毕晓丽
,葛剑平

生态学杂志 , 2009,
Abstract: 植被保水效益是黄土高原地区研究的热点,以往的研究往往将环境因子的异质性忽略,在环境均质的假设下进行小尺度的试验研究。本文基于GIS技术,综合考虑土壤、地形等因子,分析了黄土高原泾河流域的植被保水效益及空间分布特征。结果表明:泾河流域植被平均每年可以保持的水量是3.92×108 m3,占泾河流域把口站的流量的1/3;总的保水量大小为草地>农田>森林>灌丛,不同植被类型平均保水效益为农田>森林>灌丛>草地,与前人研究结果不同的是,本文的研究是基于栅格单位的(30 m),而前人则是基于点数据的;土壤类型在决定植被保水效益中起重要的作用,本文更客观地反映了流域内植被保水能力及空间分布。
The land cover changes of watersheds in Wolong and their impacts on Giant Panda potential habitats
卧龙地区流域土地覆盖变化及其对大熊猫潜在生境的影响

YANG Juan,GE Jian-Ping,HONG Jun,
杨娟
,葛剑平,洪军

生态学报 , 2006,
Abstract: 土地覆盖变化作为土地利用驱动的显著结果,是人类活动对环境影响的最显著的表现。为了将土地覆盖变化结果用于探讨大熊猫潜在生境与人为活动导致的环境变化之间的关系,利用1:25万数字高程模型和1:10万土地覆盖分类数据(1990年,2000年两期),采用流域时空对比和景观格局分析的手段,对卧龙地区两流域土地覆盖变化及大熊猫潜在生境的景观格局变化进行了对比研究,结果表明:①10a间,寿溪流域土地覆盖年变化率(0.33%)低于渔子溪流域(1.02%),且两流域土地覆盖类型的变化趋势有所不同。主要表现为:在寿溪流域,主要土地覆盖类型的斑块均表现出破碎化的趋势,且森林和灌丛的斑块破碎化趋势更显著;而在渔子溪流域,仅是与人类活动相关的草地、农田斑块破碎化加剧,而森林和灌丛的平均斑块大小反而增加了。②两流域大熊猫潜在生境的景观格局变化趋势有所不同。在渔子溪流域,大熊猫潜在生境的景观多样性指数、均匀度指数、破碎度和森林景观形状指数均高于寿溪流域。而与渔子溪全流域相比,该地区大熊猫潜在生境的森林平均斑块大小较小,并且近十年,在渔子溪流域,大熊猫潜在生境景观的森林面积比重及斑块大小的减少,森林景观形状指数的增加等变化趋势与全流域的相反,间接反映出渔子溪流域的大熊猫潜在生境所受的人类活动的压力更大。③两流域分级集水区的大熊猫潜在生境比重分布与居民点密度分布存在空间上的分异。利用缓冲区分析表明,在渔子溪流域,大熊猫潜在生境与居民点范围的重叠更为严重,约57.7%的人类活动范围处于与大熊猫潜在生境重叠的区域。据此推断,大熊猫潜在生境在流域中的分布与人类活动空间上的交错关系是导致近十年渔子溪流域大熊猫生境受到严重干扰的重要原因。
An individual-based catchment scale forest dynamic model
基于个体的集水区森林动态模型

GUO Qing-xi,GE Jian-ping,
国庆喜
,葛建平

应用生态学报 , 2007,
Abstract: In this paper, an individual-based catchment scale forest dynamic model was developed, and applied to a 400 years simulation of a real catchment. The simulation included pretreatment of topographic data, running of modified MTCLIM, and simulation of forest dynamics. The development and validation processes of this model were described, and the details of the model, including the application of GIS and the parameterization of climate and physiological factors, were presented. The simulation results of a real catchment (139 hm2) in Wolong Reserve showed that this model could describe the physiological processes and spatial distribution of tree individuals, and realize the simulation of the spatial pattern and dynamics of forest in whole catchment.
Bis{μ-2,5-bis[4-(2-pyridylmethylamino)phenyl]-1,3,4-oxadiazole}bis[dichloridomercury(II)]
Li-Li Liu,Gui-Ge Hou,Jian-Ping Ma,Ru-Qi Huang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808006788
Abstract: In the title centrosymmetric compound, [Hg2Cl4(C26H22N6O)2], each HgII center adopts a distorted HgN3Cl2 trigonal bipyramidal coordination geometry, formed by two pyridine N atoms, one imine N atom and two chloride anions. Within the organic ligand, the oxadiazole ring is nearly coplanar with the two benzene rings [dihedral angles = 5.9 (4) and 6.5 (4)°] and nearly perpendicular to the two pyridine rings with the same dihedral angle of 77.4 (4)°. The two organic ligands bridge two HgII ions to form the macrocyclic complex. Intermolecular N—H...Cl and N—H...N hydrogen bonding helps to stabilize the crystal structure.
Fractional Order Nonlinear Feedback Controller Design for PMSM Drives
Jian-Ping Wen
Mathematical Problems in Engineering , 2013, DOI: 10.1155/2013/290310
Abstract:
Multiple nonnegative solutions for BVPs of fourth-order difference equations
Sun Jian-Ping
Advances in Difference Equations , 2006,
Abstract: First, existence criteria for at least three nonnegative solutions to the following boundary value problem of fourth-order difference equation Δ4x(t-2) = a(t)f(x(t)),t ∈ [2, T], x(0) = x(T + 2) = 0, Δ2x(0) = Δ2x(T) = 0 are established by using the well-known Leggett-Williams fixed point theorem, and then, for arbitrary positive integer m, existence results for at least 2m-1 nonnegative solutions are obtained.
Experience in clinical application of Danggui Sini Decoction
ZHENG Jian-Ping
Zhong Xi Yi Jie He Xue Bao , 2005,
Abstract:
Methodological quality assessment of clinical trials in traditional Chinese medicine: the principles of evidence-based medicine
Jian-Ping LIU
Zhong Xi Yi Jie He Xue Bao , 2006,
Abstract: The quality of clinical trials in traditional Chinese medicine (TCM) was analyzed with respect to their methodology and outcome assessment according to the concepts of evidence-based medicine (EBM). It was suggested that the essential methodological principles of EBM should be applied in clinical trials of TCM, including randomization, control and blindness. The sample size estimation, optimal parameter selection for outcome assessment, compliance and intention-to-treat analysis are all important aspects of randomized controlled trials. To bring the benefits of EBM into clinical trials will improve the quality of research in TCM and also promote international co-operation and communications. It is necessary to establish an assessment system of clinical outcome for TCM on the basis of EBM in order to evaluate the efficacy and safety of TCM objectively and scientifically.
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