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OpenIFEM:A High Performance Modular Open-Source Software of the Immersed Finite Element Method for Fluid-Structure Interactions

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Computer Modeling in Engineering & Sciences 2019年第4期119卷 91-124页

作者： Jie Cheng feimi yu Lucy T.Zhang Department of Mechanical Aerospace and Nuclear Engineering Rensselaer Polytechnic InstituteTroyNY12180USA

We present a high performance modularly-built open-source *** is a C++implementation of the modified immersed finite element method(mIFEM)to solve fluid-structure interaction(FSI)*** software is modularly built to perform multiple tasks including fluid dynamics(incompressible and slightly compressible fluid models),linear and nonlinear solid mechanics,and fully coupled fluid-structure *** of open-source software packages are restricted to certain discretization methods;some are under-tested,under-documented,and lack modularity as well as *** is designed and built to include a set of generic classes for users to adapt so that any fluid and solid solvers can be coupled through the FSI *** addition,the package utilizes well-developed and tested *** also comes with standard test cases that serve as software and algorithm *** software can be built on cross-platform,i.e.,Linux,Windows,and Mac OS,using *** parallelization is also implemented for high-performance computing for large-sized *** is documented using Doxygen and publicly available to download on *** is expected to benefit the future development of FSI algorithms and be applied to a variety of FSI applications.

关键词： Immersed finite element method open-source parallelization fluid-structure interaction adaptive mesh refinement

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Spin injection in a ferromagnet/resonant tunneling diode heterostructure

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Journal of University of Science and Technology Beijing 2008年第5期15卷 638-643页

作者： Jin Bao Fang Wan yu Wang Xiaoguang Xu Yong Jiang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The spin transport property of a ferromagnet （FM）/insulator （Ⅰ）/resonant tunneling diode （RTD） heterostructure was studied. The transmission coefficient and spin polarization in a multilayered heterostructure was calculated by a Schrdinger wave equation. An Airy function formalism approach was used to solve this equation. Based on the transfer matrix approach,the transmittivity of the structure was determined as a function of the feimi energy and other parameters. The result shows that the spin polarization induced by the structure oscillates with the increasing Fermi energy of the FM layer. While the thickness of the RTD is reduced,the resonant peaks become broad. In the heterostructure,the spin polarization reaches as high as 40% and can be easily controlled by the external bias voltage.

关键词： spin injection resonant tunneling diode heterostructure spin polarization

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N离子注入对金刚石膜场发射特性的影响

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物理学报 2005年第3期54卷 1447-1451页

作者：李俊杰吴汉华龙北玉吕宪义胡超权金曾孙吉林大学超硬材料国家重点实验室物理学院长春130023

不同剂量的N离子被注入到化学气相沉积金刚石膜内 ,研究了表面结构及场发射特性的变化 .Raman谱和x射线光电子能谱分析表明 ,N离子的注入破坏了金刚石膜表面原有的sp3结构 ,并在膜内形成大量的sp2 C—C和sp2C—N键 .样品的场发射测试显... 详细信息

不同剂量的N离子被注入到化学气相沉积金刚石膜内 ,研究了表面结构及场发射特性的变化 .Raman谱和x射线光电子能谱分析表明 ,N离子的注入破坏了金刚石膜表面原有的sp3结构 ,并在膜内形成大量的sp2 C—C和sp2C—N键 .样品的场发射测试显示N离子的注入显著提高了金刚石膜场发射特性 ,膜的场发射阈值电场从注入前的18V μm下降到注入后的 4V μm .金刚石膜场发射特性的提高归因于N离子注入后膜内sp2 C键含量的增加和体内缺陷带的形成 ,这些变化能改变膜的表面功函数 ,提高feimi能级 ,降低电子隧穿表面的能量势垒 .

关键词：金刚石膜场发射特性离子注入 Raman谱能级表面势垒注入功函数电子隧穿

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Heusler合金Co_(2-x)Fe_xVAl的电子结构、磁性和半金属性研究

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武汉科技大学学报 2017年第3期40卷 167-172页

作者：张玉卢志红陈昌威方孙戴晨盼武汉科技大学材料与冶金学院湖北武汉430081

基于密度泛函理论(DFT),使用广义梯度近似(GGA)研究了Heusler合金Co_(2-x)Fe_xVAl在不同Fe掺杂比例x时的电子结构、磁性和半金属性。结果表明,随着Fe掺杂比例x的增加,合金的晶格常数和磁矩均线性降低,分别满足了Vigard和Slater-Pauling... 详细信息

基于密度泛函理论(DFT),使用广义梯度近似(GGA)研究了Heusler合金Co_(2-x)Fe_xVAl在不同Fe掺杂比例x时的电子结构、磁性和半金属性。结果表明,随着Fe掺杂比例x的增加,合金的晶格常数和磁矩均线性降低,分别满足了Vigard和Slater-Pauling规律;当x=1时,CoFeVAl合金的总磁矩与Co_2VAl(x=0)相比降低了50%,虽然费米面处出现了少量的态密度,丧失了半金属性,但其自旋极化率高达90%,仍被认为是一种很好的自旋电子学材料;此外,自旋向下带带隙宽度随x的增加逐渐变小,费米面向导带底移动,这不仅与X位原子间相互作用有关,还可能与Y位原子的轨道位置相关。

关键词： Heusler合金铁掺杂半金属性磁矩费米能级态密度

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