Analysis of the infrared transmission data of hydrogenated amorphous silicon film fabricated by high rate PECVD

The optical properties of hydrogenated amorphous silicon thin films prepared by a new thermocatalytic plasma enhanced chemical vapor deposition (PECVD) method are here reported for the first time. The transmission spectrum of the film, deposited at a rate of 1.5 nm/s, was measured between 500 and 1100 nm. The envelopes of the transmission spectrum interference maxima and minima were analyzed to reveal the absorption coefficient α(λ@#@), the refractive indexn(λ), the average thickness of the film (791 nm) and the variation of the thickness (11.4 nm), using an analysis which takes into account film inhomogeneity. The modified Newton's method of numerical analysis was used to obtain the optical parameters. The optical band gap ε₀} was determined to be 1.69 eV from the absorption coefficient spectrum, commensurate with values quoted for lower deposition rate PECVD films. The value for ε₀}, the small variation of the film thickness, and a value for the defect density of 3.7 x 10¹⁵}cm^-3} determined for similar material in other work indicate that the thermocatalytic PECVD method can produce acceptable quality films at a high deposition rate.     

基于C/S模式的体育事业统计年鉴信息系统设计与实现

本文以历年《中国体育事业统计年鉴》中的积累数据为研究对象,通过对各类统计数据表的分析,运用数据库技术和软件工程方法,确定表的结构,建立年鉴数据库;研究运用c#语言设计开发基于网络的c/s模式前端客户端,对数据库进行添加、删除、修改、查询、导出等相关操作,实现对《中国体育事业统计年鉴》数据的网络化管理。     

Foaming and Structural Studies on the Acidic Subunit of Amaranth 11S Globulin Modified with Antihypertensive Peptides as a Function of pH and Ionic Strength

Some studies aimed at revealing the relationship between protein structure and their functional properties. However, the majority of these reports have been carried out using protein isolates. There are limited reports on the possible relationship between the functional properties and the structure of a purified protein. In this work the amaranth 11S globulin acidic subunit (AAC) and five mutations of the same protein that were modified in their variable regions with antihypertensive peptides (VYVYVYVY and RIPP), were analyzed at two ionic strength (2.9 and 17.6 g/L NaCl) and pH (3.0–7.0). Results revealed better solubility for the proteins mutated at the terminal ends (AACM.1 and AACM.4) and lower solubility for the protein inserted with RIPP peptide. Spectroscopy studies revealed an increase of β-sheet structure at high salt concentration for all proteins. It was also observed that salt concentration acted as a modulator, which allowed a better foam features for all modified proteins limiting movement of side chains and reducing red-shifted displacement of λmax. All proteins showed foam capacity ranging from 76 to 93% although foam stability was twofold better for modified proteins than for AAC at high salt concentration. This study allowed better understanding about the structural changes that influence the foaming properties of engineered proteins.     

硫缺陷型In2S3光催化剂高效分解水制氢研究

缺陷工程被认为是提高光催化剂分解水制氢性能的关键策略之一,然而有关缺陷诱导半导体材料电子结构演变并增强光生载流子传输机制尚不明确。在本研究中,我们通过简单的一步水热合成法成功构建了富含S缺陷的In2S3半导体光催化剂（VS-In2S3）,在模拟太阳光辐照下其光催化分解水产氢性能相比传统的In2S3（P-In2S3）提升了近一个数量级（达到221.18 μmol/g/h）。此外,利用自主研发的原位X射线光电子能谱（SI-XPS）结合相关密度泛函理论计算证实：S缺陷可诱导强还原性的低价态In（In(3-x)+）暴露,进而增强In位点对H2O的吸附和活化能力,因此,S缺陷型In2S3表现出显著增强的光催化析氢活性。此外,可视化观测到H2O分子在原位光照下脱质子转化为OH的分解水制氢过程。该研究为缺陷型光催化剂设计及光催化分解水反应机制和过程研究提供了一定的见解。     

虾肝肠胞虫感染病理特征、18S rRNA基因序列及系统进化树分析

为调查浙江省部分地区虾肝肠胞虫(Enterocytozoon hepatopenaei,EHP)暴发来源及与其他宿主来源的微孢子虫进化关系,本研究利用形态学特征和分子鉴定,尝试对引起浙江多地凡纳对虾生长缓慢综合征的病原进行探究.同时基于18S rRNA基因序列分析该病原与其他地区及其他宿主来源微孢子虫的进化关系.结果显...     

一维声子晶体杆状结构纵向振动带隙特性

基于传递矩阵法,以一维声子晶体杆状结构纵向振动带隙特性为研究对象,应用MATLAB编程,数值模拟了A为金、铜、铝和碳,B为环氧树脂时纵向振动带隙特性,得到铜与与环氧树脂构成一维声子晶体时,形成最大振动带隙宽度3．39KHz ,其中金能够形成较多的带隙区间。数值模拟了A为铜,B为硅橡胶、有机玻璃1、有机玻璃2和塑料时,得到A为铜,B为塑料时形成最大带隙在0．51KHz -7．06KHz ,带隙宽度为6．55KHz ,这两种组合形成了最大带隙宽度。A为铜,B为有机玻璃1时形成较多的带隙结构。研究结论为一维声子晶体器件制作提供参考。     

球状光子晶体滤波器

设计一种球状光子晶体滤波器,应用特征矩阵的方法研究了光波在其中的传播规律,发现它同其他光子晶体一样,存在周期性的带隙结构,与一维和二维光子晶体相比较,具有全方向的滤波功能.     

基于B／S模式的汽车件零销存管理信息系统的设计与实现

对于采用连锁经营的汽车零件销售企业来说，各经营网点分布在同一城市的不同区域或不同城市，为了在充分利用原有信息和资源的基础上处理好许多中间环节，减少人员工作量。保证企业销存状态良好，提高管理效率，设计了基于B／S模式的汽车零件销存管理信息系统的技术方案，详细讨论系统的功能设计以及实现技术。     

粉防己碱对血管性痴呆大鼠齿状回S100B蛋白表达的研究

目的：探讨粉防己碱（Tet）对血管性痴呆（VaD）大鼠齿状回S100B蛋白表达的影响以及在血管性痴呆发病中的作用。方法：运用双侧颈总动脉永久性结扎（2-VO法）建立VaD大鼠模型,Nissl染色观察海马齿状回（DG）神经元内的尼氏小体的变化,免疫荧光观察海马DG区S100B的表达情况,F1uo-3/AM探针负载后检测各组大鼠海马内〔Ca2＋〕i浓度变化,探讨Tet改善VaD大鼠神经功能的分子机制。结果：Nissl染色后,Tet干预组大鼠海马DG区尼氏小体较模型组显著增多;免疫标记发现Tet干预组大鼠DG区神经元内S100B蛋白的表达量明显增多;Tet干预组大鼠海马〔Ca2＋〕i浓度显著下降（p〈0.05）。结论：Tet可改善大鼠脑缺血损伤引起的学习记忆能力障碍,可能与Tet下调S100B蛋白,抑制钙离子有关。     

气粒混合物非灰辐射特性合并宽窄谱带K分布模型

气粒混合物辐射问题具有全场性、非灰性、耦合性等特点,准确预估高温燃气/粒子非灰辐射特性是非常重要的。本文将合并宽窄谱带K分布模础(CWNBCK)与离散坐标法(DOM)结合,开展了非灰气粒混合物辐射换热问题的模拟工作,分别验证了一维和三维情况下应用该模型的准确性,给出不同工况下的热流源项、壁面热流或辐射热流等。结果表明:该模型能够给出与SNB模型精度基本相同的结果,考虑其计算效率的提高,可以在工程实际中应用该模型计算非灰气粒混合物辐射换热。