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Search Results: 1 - 10 of 220167 matches for " WANG Li-Guang "
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Calculation of electron capture probabilities in collisions of O5+ ion with H atom

Wang Li-Guang,Wang Jun,
,王 军

物理学报 , 2003,
Abstract: 利用原子轨道作基函数展开系统波函数,附加电子转移因子修正O^5 离子和H原子相互作用时的边界条件,计算了初始通道的势能。在得出的理论值与实验值符合很好的情况下,验证了计算参数的可靠性,在碰撞参数b=8.0a.u.,碰撞速度υ=220.0a.u.的条件下,利用心核近似方法完成了O^5 离子和H原子碰撞过程中8个∑状态的随时间变化电子俘获概率的理论计算。
Density-Functional-Theory Studies of C20 in Femtosecond Laser Pulses

WANG Zhi-Ping,BIAN Bao-An,WANG Li-Guang,

中国物理快报 , 2010,
Second-Order Born Effect in Single Ionization of Argon by Electron Impact

WANG Yang,ZHOU Ya-Jun,JIAO Li-Guang,

中国物理快报 , 2012,
Resonances in Electron Impact on Atomic Oxygen

WANG Yang,ZHOU Ya-Jun,JIAO Li-Guang,Kuru Ratnavelu,

中国物理快报 , 2008,
Abstract: The momentum-space coupled-channels-optical (CCO) method is used to study the resonances in electron--oxygen collision in the energy region of 9--12eV. Present results have shown agreement with the available experimentaland theoretical results, and new positions of resonances are found by the comparison of total cross sections.
A 50-year record of dichloro-diphenyl-trichloroethanes and hexachloro-cyclohexanes in lake sediments and penguin droppings on King George Island, Maritime Antarctic
A 50-years record of dichloro-diphenyl-trichloroethanes and hexachloro-cyclohexanes in lake sediments and penguin droppings on King George Island,Maritime Antarctic

SUN Li-guang,YIN Xue-bin,PAN Can-ping,WANG Yu-hong,
SUN Li-guang
,YIN Xue-bin,PAN Can-ping,WANG Yu-hong

环境科学学报(英文版) , 2005,
Abstract: Since the ban on the use of organochlorine pesticides(OCPs) such as dichloro-diphenyl-trichloroethane(DDT) and hexachlorocyclohexane(HCH) in agriculture, their levels have generally dropped. In a number of cases, however, the levels of these OCPs were found to be unchanging or even increasing after the ban. With the aim to unveil the possible causes of these exceptions, we collected two lake cores from King George Island, West Antarctica, and determined their accumulation flux profiles and temporal trends of these OCPs. In the lake core sediments with glacier meltwater input, the accumulation flux of DDT shows an abnormal peak around 1980s in addition to the expected one in 1960s. In the lake core sediments without glacier meltwater input, the accumulation flux of DDT shows a gradual decline trend after the peak in 1960s. This striking difference in the DDT flux profiles between the two lake cores is most likely caused by the regional climate warming and the resulted discharge of the DDT stored in the Antarctic ice cap into the lakes in the Antarctic glacier frontier. Furthermore, to investigate the change of OCPs loadings in the Antarctic coastal ecosystem, we reconstructed the HCH and DDT concentration profiles in penguin droppings and observed a gradual increase for the former and a continuous decrease for the latter during the past 50 years. The increase of HCH seems to be due to the regional warming from the early 1970s and the resulted HCH discharge to the coastal ecosystem by glaciers'meltwater and the illegal use of HCH in the Southern Hemisphere in the recent decade. The different temporal trends of HCH and DDT accumulation rate in the lake core with glacier meltwater input and the aged penguin droppings can be explained by their different water-soluble property.
Electronic transmission of three-terminal pyrene molecular bridge

Wang Li-Guang,Zhang Xiu-Mei,Terence Kin Shun Wong,Katsunori Tagami,Masaru Tsukada,

中国物理 B , 2009,
Shear-thinning behavior of the CaO–SiO2–CaF2–Si3N4 system mold flux and its practical application
Ying Xu,Zhi-peng Yuan,Li-guang Zhu,Yi-hua Han,Xing-juan Wang
- , 2017, DOI: https://doi.org/10.1007/s12613-017-1500-8
Abstract: Satisfying the mold-flux performance requirements for high-speed continuous casting necessitates the development of a new non-Newtonian-fluid mold flux with shear-thinning behavior, i.e., a mold flux whose viscosity is relatively high under lower shear rates and relatively low under higher shear rates. In this work, a mold flux that exhibits shear-thinning behavior was developed by adding different amounts of Si3N4 to the CaO–SiO2–CaF2 mold flux. The shear-thinning behavior was investigated using a rotational viscometer. In addition, the microstructure of the newly prepared slags was studied by high-temperature Raman spectroscopy and X-ray photoelectron spectroscopy. The results showed that the mechanism of shear-thinning was attributable to a temporary viscosity loss caused by the one-way shear stress, whereas the corresponding magnitude of shear-thinning was closely related to the degree of polymerization (DP). Finally, the non-Newtonian fluid mold flux was used for laboratory casting tests, which revealed that the mold flux could reduce slag entrapment and positively affect the continuous casting optimization.
Quantum transport of four-terminal nano-molecular bridge

Wang Li-Guang,Li Yong,Yu Ding-Wen,Wang Jun,
,李 勇,郁鼎文,王 军

物理学报 , 2005,
Abstract: 利用基于Greenfunction的Tight-binding方法,对由平面共轭分子连结而成的有四个端子的纳米分子桥进行了理论研究和数值模拟,得出了入射电子通过纳米分子桥传输到各个端点的电子透射概率.利用Fisher-Lee关系式和电子流密度理论,在透射概率出现峰值的四个能量点E=±12,E=±149处计算了分子桥内的电子流分布.不仅得出了键电子流的最大值,而且揭示了分子内环路电子流生成和存在是由于分子轨道波函数的位相差使电子流的大小和方向发生变化而引起的.
Electronic conductance of zigzag single wall carbon nanotube with an implanted Li atom

Wang Li-Guang,Zhang Hong-Yu,Wang Chang,Terence K S W,
,张鸿宇,王畅,Terence K. S. W.

物理学报 , 2010,
Abstract: The first principles based on the density functional theory and the nonequilibrium Green's function method are adopted to research the electronic transmission of a zigzag single wall carbon tube with an implanted Li atom. The transmission model is built after optimizing the structure of the single wall carbon nano tube with the implanted Li atom. The electronic transmission and the density of states are obtained. The electronic transmission characteristics are analyzed when the electronic energy and the bias voltage vary. It is found that the conductivity changes obviously as SWCNT is implanted with the Li atom, the electronic transmission band is broadened and the quantum step effect is recovered.
Electron structure and electron conductance of fullerene C32 with Au electrodes

HUO Xin-Xia,Wang Chang,Zhang Xiu-Mei,Wang Li-Guang,

物理学报 , 2010,
Abstract: The first principle based on the density functional theory and nonequilibrium Green's function method is adopted to study the energy level, the electronic structure and the electronic conductance of C32 molecular devices in which Au(1,1,1) electrodes are a ttached to the two farthest carbon atoms when different distances between electrodes and the central molecule are considered. The electronic transmission spectrum and I-V curves of the molecular devices at different distances are obtained. The reasons leading to the electronic structure and the electronic transmission characteristics are analysed. The impacts of the distance between Au electrodes and the central molecule and the gate-voltage on the electronic transmission are discussed. The results show that the distance between the central molecule and Au electrodes has greater influence on the electronic transmission characteristics. The results also show that the C32 molecule has obvious semiconductor characteristics.
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