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Search Results: 1 - 10 of 19933 matches for " Ji-An Duan "
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Optical Properties of the Coupling Interface for Planar Optical Waveguides  [PDF]
Yu Zheng, Ji-An Duan
Optics and Photonics Journal (OPJ) , 2011, DOI: 10.4236/opj.2011.13018
Abstract: Planar optical waveguides are the key elements in a modern, high-speed optical network. An important problem facing the optical fiber communication system, specifically planar optical waveguides, is coupling. The current study presents a coupling model for planar optical waveguides and optical fibers. The various effects of the optical properties of the coupling interface were analyzed by the scalar finite difference beam propagation method, including the thickness, with or without the matching refractive index of the interface adhesive. The findings can serve as a guide for planar optical waveguide packaging.
AN ISOTHERMAL EQUATION OF STATE FOR SOLIDS
一个等温状态方程

XU JI-AN,
徐济安

物理学报 , 1976,
Abstract: 固体状态方程是研究固体材料的体积、压力和温度之间的关系,研究的对象大多是多晶材料等各向同性固体。由于具有极大的实际意义,近年来,几乎对所有材料都进行过状态方程的实验测定。在高压物理的范围内,主要讨论等温条件下的P(压力),V(体积)关系。
ELECTRONIC STATES OF SUBSTITUTIONAL AND INTERSTITIAL GROUP-IB IMPURITIES IN SILICON
硅中替位式和间隙式IB族杂质的电子态

WU JI-AN,
吴汲安

物理学报 , 1988,
Abstract: 我们对硅中IB族杂质Cu,Ag和Au的单粒子电子结构用自洽的Xα-SW法作了计算。用集团XSi4Si′12和XSi10Si′16分别模拟替位式和四面体间隙式杂质X所局域微扰的硅晶体。这两类集团已广泛地得到采用,我们已经成功地用它研究硅中4d过渡金属杂质的性质。计算得到;替位杂质在带隙中导致一个t2能级,它几乎不具有d性质而是类悬挂键的。间隙杂质在带隙中导致一个a1能级,对于Si:Au,此能级位置接近导带底,轨道是非常离域的。此外,还得到一个位于价带底之下类s的超深能级。对硅中1B族杂质的电子性质的趋势作了详细讨论。
Research on softening of longitudinal mode under high pressure and equation of state of γ-Ce
γ-Ce中的高压纵波声子模软化和状态方程描述

Li Feng-Jiao,He Duan-Wei,Liu Lei,Zhang Yi,Jing Qiu-Min,Liu Sheng-Gang,Chen Hai-Hua,Bi Yan,Xu Ji-An,
李风姣
,贺端威,柳雷,张毅,敬秋民,刘盛刚,陈海花,毕延,徐济安

物理学报 , 2012,
Abstract: Angle dispersive X-ray diffraction measurements of γ -Ce are performed in a diamond anvil cell under up to 0.74 GPa at room temperature. The accurate high pressure bulk modulus data obtained from ultrasonic measurements are used to calculate the parameters of various equations of states (EOSs). We find that the three order Murnaghan EOS and three order Xu EOS are fitted best to the relationships of the pressure vs. volume and the pressure vs. bulk modulus for γ -Ce.
Four-dimensional dosimetry validation and study in lung radiotherapy using deformable image registration and Monte Carlo techniques
Tzung-Chi Huang, Ji-An Liang, Thomas Dilling, Tung-Hsin Wu, Geoffrey Zhang
Radiation Oncology , 2010, DOI: 10.1186/1748-717x-5-45
Abstract: Monte Carlo simulation is the most accurate radiation dose calculation algorithm in radiotherapy [1,2]. With the advent of increasingly fast computers and optimized computational algorithms, Monte Carlo methods promise to become the primary dose calculation methodology in future treatment planning systems [3-6]. Thoracic tumor motion could introduce discrepancies between the dose as planned and actually delivered, both to the tumor and the surrounding normal lung [7]. Incorporating Monte Carlo methods into 4-dimensional (4D, 3 spatial dimensions plus time) dosimetry and treatment planning yields the most accurate dose calculations for thoracic tumor treatments [8,9].To generate a 4D Monte Carlo dose calculation, it is necessary to calculate the dose on CT image sets derived from different time points across the respiratory cycle. These can then be fused together to calculate cumulative doses. Deformable image registration is an integral part of this process. It provides a voxel-to-voxel link between the multiple respiratory phases of a 4D CT image set so that the dose distribution on each phase can correctly be summed to give a path-integrated average dose distribution [10,11]. Deformable image registration across the various phases of a 4D CT image set has become a new focus of study [10,11].In this study, 4D Monte Carlo dosimetry was presented. The 4D cumulative point dose in a moving phantom was compared with measurement. Clinical lung cancer cases were studied with the goal of determining under which conditions 4D Monte Carlo dosimetry likely differs from a static plan and how many respiratory phases are necessary to be included in 4D dose calculation.A total of four CT simulation image sets were used in this study. Two were performed on actual patients. Two lung cancer patients underwent 4D CT scanning (Case 1 and Case 2). These 4D CT data sets were comprised of a total of 10 CT scans per patient, taken at equally-spaced intervals across the entire respiratory
ESTIMATION OF THE CONDITIONS FOR SYNTHESIZING A15 TYPE Nb3Si AT HIGH PRESSURE
高压下A15结构Nb3Si合成条件的估计

XU JI-AN,ZHU ZAI-WAN,
徐济安
,朱宰万

物理学报 , 1976,
Abstract:
ON THE SUPERCONDUCTING TRANSITION TEMPERATURE OF METALLIC ELEMENTS IN PERIODICAL SYSTEM AND A-15 COMPOUNDS
周期系金属元素和A-15化合物超导转变温度的计算

ZHU ZAI-WAN,XU JI-AN,
朱宰万
,徐济安

物理学报 , 1978,
Abstract: 一、理论方法概述 根据BCS理论,在弱耦合极限下,超导转变温度T_c由下式给出:其中K_B是玻耳兹曼常数,是金属费米面上散射电子的声子平均能量,在德拜近似下,德拜温度为的金属有N(0)是正常金属费米面上单自旋电子的态密度,V是表征费米面附近电子间净相互作用平均强度的参量。
ADVANCES IN EXTRACTION OF ORGANIC-INORGANIC INTERACTION INFORMATION WITHIN OIL RESERVOIR AND PRECISE CORRELATION TECHNIQUE WITH SOURCE ROCK
油藏储层内有机-无机相互作用信息提取与烃源岩精细对比技术研究进展

WANG Qi,SHI Ji-an,
王琪
,史基安

天然气地球科学 , 2005,
Abstract: Authigenic minerals and fluid inclusion as well as hydrocarbon biomarkers preserved in these phases could record the temporal and spatial heterogeneity of fluid flow within the oil and gas pool and be the carrier of the information related to the organic-inorganic interaction during oil& gas fluid infilling the reservoir.In recent years,the rapid development of the solid-fluid microanalysis techniques involved in oil & gas reservoirs has been the efficient tools in the field of reservoir geochemistry and oil pool geochemistry.As a result,the achievements obtained in these fields have fully demonstrated that the information extracted by these novel techniques is far more abundant than that obtained from the crude oil within the oil reservoirs.Thus,through the microanalysis on the solid-fluid area in oil pool and correlation with the possible source rocks will be bound to become the most efficient way to expound the origin of superimposed complex oil and gas pools in terrigeneous basins of China.
Distributed Moving Horizon State Estimation for Wireless Sensor Networks Using Multiple Quantized Data
无线传感器网络中基于多比特量化数据的滚动时域状态估计

Luo Ji-an,Chai Li,Wang Zhi,
骆吉安
,柴利,王智

电子与信息学报 , 2009,
Abstract: In this paper, a distributed moving horizon state estimation approach is presented based on multi-bit quantized data. Each sensor node preserves a list of thresholds which are used to quantize observations into multiple bits. After receiving these bits, the Fusion Center (FC) makes the final estimation for system states. Simulation results show that the more number of thresholds, better estimation results will be made, Which is Consistent with Common Sense. Compared with single bit distributed moving horizon state estimation, this method avoids FC sending the estimate information back to sensor nodes and provides higher precision of state estimation.
Diamond Structure BeO, Designable Super-Hard Materials and Semiconductor Be-Diamond

XU Ji-An,BI Yan,SUN Zong-Qi,XIE Hong-Sen,

中国物理快报 , 2009,
Abstract: It is possible for Beryllium oxide (BeO) to have a cubic diamond structure although it normally has a hexagonal structure under ambient conditions. As the solution of cubic BN and diamond, the solid solution of cubic BeO-diamond or BeO-cBN-diamond can potentially be a kind of super-hard materials with designable hardness; and this solution has also been confirmed based on our preliminary first principles calculations. In addition, the nonstoichiometry of BeO could create a mobile carrier in the cubic BeO-C or BeO-BN-C system and it might lead to a new type of semiconductor Be-diamond.
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