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Search Results: 1 - 10 of 231585 matches for " 陈兰丽 "
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Ag嵌入ZnO(10 0)表面的第一性原理研究
Ag Incorporation on ZnO(10 0) Surface: First Principles Study
 [PDF]

胡宏铎,
Applied Physics (APP) , 2014, DOI: 10.12677/APP.2014.48018
Abstract:
基于密度泛函理论,采用第一性原理计算了Ag嵌入ZnO(10 0)面的几何结构和导电性以及电子结构,分析了Ag掺杂ZnO(10 0)面的表面结构弛豫和Ag嵌入ZnO (10 0)不同层的形成能情况。计算结果表明:和纯净ZnO(10 0)相比,Ag嵌入ZnO(10 0)受结构弛豫影响比较明显。同时发现,Ag嵌入ZnO(10 0)第一层的形成能最低,因此,Ag嵌入在第一层的情况最稳定,这表明Ag原子更容易集中在表面层,而不是占据体内位置。通过对纯净和掺杂体系的态密度图分析发现,Ag嵌入ZnO(10 0)表面表现为p型特征,有利于p型的制备。然而,Ag嵌入ZnO(10 0)第一层的离化能较高,不利于p型导电。
Based on the density function theory, we have performed first principles calculations of energetic stability and conductive properties and electronic structure of Ag incorporation on ZnO (10 0) surface, and after calculations, we have analyzed the relaxation of the structure and formation energy of Ag incorporation on ZnO (10 0) surface at different layers. Our results show that com-pared with pure ZnO (10 0), there is an obvious effect on the relaxation of the structure for Ag incorporation on ZnO (10 0) surface. Simultaneously, we found that the formation energy of the Ag incorporation on the first layer is the lowest in all cases. Therefore, Ag incorporation on the first layer is the most stable, which indicates that Ag atom prefers to collect in the surface layer instead of the bulk. And we found that the system for Ag incorporation on ZnO (10 0) surface demonstrates as p-type, which is in favors of fabricating p-type material. However, the ionization of Ag incorporation on ZnO (10 0) surface is much higher, which hinders the electronic ionize.

N-S共掺ZnO的电子结构和光学性质的第一性原理研究
First-Principles Investigation of Electronic Structure and Optical Properties in N-S Codoping ZnO
 [PDF]

胡宏铎,
Applied Physics (APP) , 2014, DOI: 10.12677/APP.2014.44007
Abstract:

为了分析纯净ZnO和N元素的掺入对S掺杂ZnO的电子结构和光学性质的影响,基于密度泛函理论采用第一性原理计算方法,我们研究了各种复合体的缺陷形成能、离化能、态密度、导电率、介电函数和吸收系数。结果发现:3N-S共掺ZnO不仅能提高N受主溶解度,而且可以引起浅受主能级。这表明3N-S共掺能够得到高质量稳定p型ZnO。同时,随着N原子的增加,体系的离化能迅速降低,而体系的导电率增强。另外,通过对介电函数和吸收系数的计算,结果表明3N-S共掺ZnO在低能区有非常奇特的特性。希望不久我们的理论结果能够为实验提供理论依据。
To analyze the electronic structures and optical properties of pure-ZnO and N-S codoped ZnO, the defect formation and ionization energy, density of states, conductivity, dielectric constant and adsorption coefficient of varies complexes were calculated by the first-principles calculation methods based on Density Functional Theory (DFT). It is found that 3N-S codoping in ZnO not only enhances N acceptor solubility, but also leads to shallower acceptor energy, demonstrating that 3N-S codoping can obtain a high-quality and more stable p-type ZnO. Furthermore, as the incorporation of N atoms is increasing, the ionization energies of the complexes are sharply decreasing, and the conductivity of the system is enhanced. In addition, the calculation of the dielectric functions and adsorption spectrum shows that 3N-S codoped ZnO has interesting characteristic in the low-energy region. We expect that this theory study might be helpful for the experimental results.

N掺杂ZnO (100)表面对其电学性质的影响
Influence of N Doping on Electronic Properties of ZnO Surface
 [PDF]

胡宏铎,
Advances in Condensed Matter Physics (CMP) , 2014, DOI: 10.12677/CMP.2014.34007
Abstract:
基于密度泛函理论的第一性原理计算了N掺杂ZnO (100)表面的形成能和电学性质。首先,我们分析了N掺杂ZnO (100)表面不同层时的结构弛豫情况,接着计算了N掺杂表面的形成能和电子结构。结果表明N掺杂后体系发生较大的晶格畸变。N掺杂块体ZnO的形成能比掺杂表面时的形成低。结果表明N很容易聚集在体内而不是表面。从N掺杂ZnO (100)表面的电子结构中得知,体系的费米能级向价带移动,这主要归因于N-p态,同时体系表现为p型特征。
A theory of formation energy and electronic properties of N doping ZnO (100) surface is proposed on the first principles based on density function theory. First, we have analyzed the relaxation of the structure of N doping ZnO (100) surface at different layers. Later, we have calculated the formation energy and electronic structure of N doping ZnO (100) surface. The results show that there is a large lattice distortion after N doping. And the formation energy is lowest in the bulk ZnO when N is doped in the bulk ZnO. The results show that N atom easily accumulates in the body instead on the surface layers. The calculated electronic structure shows that the Fermi level shifts into the valence band which is contributed by N-p states, and the system after doping demonstrates as p-type.
Analysis and Status Quo of Chinese Journals Cited by American Database Index Medicus
美国《医学索引》收录的中国期刊现状和分析

,
中国科技期刊研究 , 2009,
Abstract: 对截至2008年2月美国<医学索引>收录的86种中国大陆主办期刊进行了统计,对其出版地、主办单位、被收录的起始年、收录情况、电子邮箱、网址、是否被中国科学引文数据库(CSCD)收录、文种、刊期及学科或专业进行了统计与分析,并对我国与部分欧美和亚洲国家的收录数进行了比较.
利钠肽的结构、受体与生理作用
,英?
生物化学与生物物理进展 , 2002,
Abstract:
美国《医学索引》收录的中国期刊现状和分析
文?,
中国科技期刊研究 , 2009,
Abstract:
67例牛黄解毒丸(片)不良反应分析
,
中国中药杂志 , 2002,
Abstract: 牛黄解毒丸(片)是我国历史年延常用的中成药,主要由牛黄、黄芩、雄黄、石膏、大黄、桔梗、冰片、甘草8味药组成,临床主要用于火热毒邪炽盛于内,上扰清窍导致的咽喉、牙龈肿痛、口舌生疮、目赤肿痛等,人们常将其作为家庭常备良药。但历年来对其不良反应屡有报道,本文综合如下,以提醒人们中成药并不绝对安全,使用时务必注意不要过量或长期服用,以避免对人体造成不应有的伤害。1 资料来源根据王永铭主编的不良反应1960~1997年多....
人参及人参精中四种六六六异构体的提取及测定
, , 王雅丽
中国公共卫生 , 1995,
Abstract: ?人参及人参精中四种六六六异构体的残毒,使用正己烷+丙酮溶剂。通过浸泡-超声波间断振荡的方法提取后,由OV-1701毛细管柱分离,电子捕获检测器测定。
基于互质因子摄动的系统非脆弱鲁棒解耦控制
,王道波,,细松
控制与决策 , 2007,
Abstract: 研究对象和控制器存在互质因子不确定性时闭环系统鲁棒稳定和非脆弱鲁棒解耦控制问题,得到了闭环系统具有鲁棒稳定性和鲁棒解耦性能的充分条件,给出了鲁棒控制器的优化设计方法.
雷米普利对野百合碱诱导的肺动脉高压大鼠肺组织中一氧化氮和内皮型一氧化氮合酶活性的影响
孙金华,,
解放军医学杂志 , 2009,
Abstract: 【摘要】目的?探讨雷米普利对野百合碱诱导的肺动脉高压大鼠肺组织中一氧化氮(NO)和内皮型一氧化氮合酶(eNOS)活性?的影响。方法??雄性SD大鼠60只,随机分为正常对照组、野百合碱组、雷米普利组(n=20)。野百合碱组和雷米普利组一次性颈部?注射野百合碱60mg/kg后,雷米普利组用雷米普利灌胃4周,野百合碱组生理盐水灌胃4周;对照组颈部注射生理盐水后再用生理盐?水灌胃4周。4周后测定大鼠的右室收缩压(RVSP)和右心室肥厚指数(RVHI),运用图像分析软件测定肺小动脉管壁厚度(WT)占?动脉外径(ED)的百分比(WT%)及管壁面积(WA)占血管总面积的百分比(WA%);检测肺组织中NO浓度。Westernblotting分析肺?组织中eNOS、P-Ser1177-eNOS的表达和蛋白激酶B(Akt)的磷酸化水平。结果??与正常对照组相比,野百合碱组RVSP、RVHI、?WT%、WA%明显升高(P<0.05),肺组织中NO浓度、eNOS、P-Ser1177-eNOS和Akt磷酸化水平显著降低(P<0.05);雷米普利干预?后RVSP、RVHI、WT%、WA%明显降低(P<0.05),肺组织中NO浓度、eNOS、P-Ser1177-eNOS和Akt磷酸化水平明显升高(P<?0.05)。结论??雷米普利可抑制野百合碱诱导的肺动脉高压及肺血管重构,机制可能与其能使eNOS活性和NO生成增加有关。
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