射频磁控溅射制备SiO_2薄膜及性能表征

采用射频磁控溅射技术,制备4种不同溅射时间的SiO2薄膜.用XRD、PL、FTIR、UV-Vis等对薄膜的微结构、发光、红外吸收以及透、反射进行表征.结果表明:SiO2薄膜仍呈四方晶体结构,平均晶粒尺寸在17.39～19.92nm之间;在430nm附近出现了发光峰,在1049～1022cm-1之间出现了明显的红外吸收峰,且随着溅射时间的增加发生红移;在可见光范围内平均透射率大于85%.     

一种制备SiO2膜的方法 ——氧等离子体处理聚硅烷涂层

作者利用低温氧等离子体处理聚硅烷涂层,成功地制备了SiO2膜．由IR谱给出的Si-O键的吸收峰波数,随氧等离子体处理时间的不同在1065～1088cm-1范围变化;XPS谱给出Si2p的结合能为103．3～103．5eV,硅氧原子比为11．99;激光椭园偏振仪测得折射率在1．30～1．55范围;MOS电容的高频C-V特性曲线表明,平带电压为正,计算得氧化物电荷的电性为负,密度为6．6×1010～8．8×1011cm-2,其大小可以通过改变处理条件进行控制;BT实验表明,可动电荷密度为(3～6)×1010cm-2,这种新型的SiO2膜可望在微电子器工艺中得到应用．     

TiO_2/SiO_2纳米粉体的相变及其红外性能

以溶胶-凝胶法制备纳米TiO2/SiO2复合粉体,用XRD,AFM,IR等方法进行了表征,研究了纳米TiO2/SiO2复合材料的晶型转变温度变化和红外吸收性能.结果表明,所制备的纳米TiO2/SiO2复合材料与单一组分的纳米TiO2,SiO2相比,晶型转变温度有提高的趋势,并且该复合材料在1700～400cm-1范围内有较强的红外吸收.     

用不同靶材制备B-C-N薄膜及其红外表征

采用射频磁控溅射方法,分别利用六方氮化硼(h-BN)、硼(B)和石墨(C)靶,在氩气和氮气的氛围中,沉积B-C-N薄膜.傅里叶变换红外光谱(FTIR)分析表明:在1200～1800cm-1和1000～1750cm-1处出现了较宽的吸收峰;在2200cm-1处出现了CN键的特征吸收峰.表明在沉积的薄膜中,C原子与N原子相结合.分别溅射C和h-BN靶,红外光谱分析表明,B—C键在1100cm-1处未产生吸收峰,即利用h-BN和C靶沉积的B-C-N薄膜倾向于相分离,利用B和C靶沉积的B-C-N薄膜中的原子实现了原子量级的化合.     

乙基曙红分光光度法测定蛋白质

在pH3 5～4 0的NaAc HCl介质中,乙基曙红与蛋白质结合形成复合物,溶液颜色发生变化,最大吸收波长为548nm,比乙基曙红红移了28nm,并在520nm处产生最大褪色,其吸收或褪色作用均可用于蛋白质的分光光度测定.在最大吸收波长548nm处,蛋白质的浓度在0 23～20 0μg·mL-1(HSA)和0 25～17 5μg·mL-1(BSA)范围内与吸光度成正比,其表观摩尔吸光系数分别为1 33×106L·mol-1·cm-1(BSA)和1 26×106L·mol-1·cm-1(HSA);而在最大褪色波长520nm处测量,上述范围的蛋白质浓度也与褪色程度成直线关系,其表观摩尔吸光系数分别为2 02×106L·mol-1·cm-1(BSA)和2 06×106L·mol-1·cm-1(HSA),褪色光度法灵敏度更高.并且方法选择性好,用于尿液及人血清样品中总蛋白的测定,所得结果与考马斯亮蓝法基本一致.     

氟化非晶碳氢薄膜的红外结构及其电学特性

通过感应耦合等离子体(ICP)化学气相沉积方法并利用C4F8和H2的混合气体制备了氟化非晶碳氢(a C:F,H)薄膜.使用红外光谱仪分析了薄膜的结构.研究了金属Al/a C:F、H/SiMIS结构在不同环境光和不同频率下的电容 电压(C V)特性.红外结果表明,在800cm～1800cm-1和2700～3100cm-1的波数范围内,薄膜存在大量的C——C、C—F和C—H的振动结构.从薄膜的C V曲线的计算结果表明,薄膜当中的缺陷电荷约为1.07×1010cm-2,这些电荷主要局域在C——C双键周围 同时,由于界面陷阱电荷的存在,使得C V曲线随着测试频率的增加向负偏置方向偏移.     

分光光度法测定饮料中色素含量

采用紫外分光光度法对饮料中两种食用色素进行了同时测定。确定了各色素的最大吸收波长及最大吸收波长处的吸收系数和摩尔吸收系数。结果表明柠檬黄最大吸收波长分别为424 nm,吸收系数为32.22 L.g-1.cm-1,摩尔吸收系数为1.72×104L.mol-1.cm-1;胭脂红的最大吸收波长为507 nm,吸收系数为35.92 L.g-1.cm-1,摩尔吸收系数为2.17×104L.mol-1.cm-1。测定饮料中柠檬黄和胭脂红的含量分别为4.32×10-3mg.mL-1、3.36×10-3mg.mL-1,相对标准偏差分别为2.89%、2.57%,加标回收率分别为89.7%、90.6%。该方法操作简便,易于推广,可用于实际样品的检测。     

TB-偶氮胂双波长分光光度法同时测定锶、钡

研究了TB -偶氮胂与锶、钡的显色反应 ,实验结果表明 ,该络合反应在pH 0 .2～ 2 .5酸度范围内具有较好的灵敏度 (εSr =4 .5× 1 0 4L·mol- 1 ·cm- 1 和εBa =4 .3× 1 0 4L·mol- 1 ·cm- 1 ) ,反应酸度范围宽 (pH 0 .2～2 .5 )且两者最大吸收波长具有明显差异 ,可用双波长分光光度法同时测定Sr2 +、Ba2 +.该方法用于某些纯试剂中Sr、Ba的同时测定 ,结果满意     

非离子表面活性剂Tween-80存在下5-Br-PADAP分光光度法测定微量Cu(Ⅱ)和Ni(Ⅱ)

在pH 3.50酸性介质中 ,Cu 和Ni 在非离子表面活性剂Tween - 80存在下 ,与5-Br-PADAP生成有色配合物 ,其最大吸收波长位于 575nm处 ;表观摩尔吸光系数分别为7.97× 10 4 L·mol- 1 ·cm- 1 和 1.0 2× 10 5 L·mol- 1 ·cm- 1 ;Cu 在 0～ 0 .52mg·L- 1 ;Ni 在0～ 0 .4 8mg·L- 1 范围内符合比耳定律 .用拟定的方法测定了钢样中的Cu 和Ni 含量 ,结果令人满意 .     

利用射频PECVD技术低温制备纳米晶硅薄膜

利用射频等离子体增强化学气相沉积(PECVD)技术低温制备了氢化纳米晶硅(nc-Si:H)薄膜.通过优化沉积参数,得到晶粒尺度小于10 nm,晶态体积比为58%的nc-Si:H薄膜.对nc-Si:H薄膜的光电特性进行研究,结果表明,在100 mW/cm2的光照下,nc-Si:H薄膜的光电导率为1.5×10-3Ω-1.cm-1,室温暗电导率为8.4×10-4Ω-1.cm-1,光学带隙为1.46 eV.利用射频PECVD制备的nc-Si:H薄膜具有明显的量子点特征.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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