C+注入a-SiNx：H薄膜的微结构及光发射的研究

常温下对低压化学气相沉积制备的纳米硅镶嵌结构的a-SiN_x:H薄膜进行低能量高剂量的C⁺注入后,在800~1200℃高温进行常规退火处理。X射线光电子能谱(XPS)及X射线光电子衍射(XRD)等实验结果表明,当退火温度由800℃升高到1200℃后,薄膜部分结构由SiC_xN_y转变成SiN_x和SiC的混合结构。低温下利用真空紫外光激发,获得分别来自于SiN_x、SiC_xN_y、SiC的,位于2.95,2.58,2.29 eV的光致发光光谱。随着退火温度的升高,薄膜的结构发生了变化,发光光谱也有相应的改变。     

Influences of Temperature and Solvent Ions in Solution on States and Properties of Deoxyribonucleic Acid (DNA)

We here study the influences of the temperature and solvent ions in solution on the states and properties of DNA by a new dynamical model. This model admits three degrees of freedom per base-pair: two displacement variables related to the vibrations of the hydrogen atom in the hydrogen bonds and base (nucleotide), respectively, and an angular variable related to the rotation of each base, which delineate different forms of motion of the hydrogen atom and bases and the relations among them. In this model we stress specially the important role of the hydrogen atom in the hydrogen bonds of the bases in the dynamics of DNA. According to their properties of motion we give the Hamiltonian of the system and the corresponding equations of motion, and find out their soliton solutions. The solitons formed by the displacements of the hydrogen atoms and bases and their rotations are the excitation states arising from the energy absorbed by the DNA working at the biological temperature. We give further the free energy of the thermal excitation state in DNA system by transfer integral way and find out the corresponding specific heat. The specific heat increases with the increasing of the temperature and concentration of the solvent ions in the solution, but is not linear changes in the region of high temperature. If compared with experimental data, they are approximately consistent. Meanwhile we find that the solvent ion concentration influences seriously on the stability, states, and configurations of DNA.     

Correction of Relativistic Center-of-Mass Vector on Electric Polarizability of Pion Meson

We estimate the correction of relativistic center-of-mass vector on electric polarizability of an equal-mass quark-antiquark system numerically. Effect on the system confined by different interactive potentials is analysed. A great improvement for the electric polarizability of pion meson is obtained.     

Bloom-Gilman Duality of Nucleon Spin Structure Function and Elastic Peak Contribution

By employing the parametrization form of the nucleon spin structure function in the resonance region, which includes the contributions of the resonance peaks and of nonresonance background, we study Bloom-Gilman quark-hadron duality of g₁ both in the inelastic resonance region and elastic one.     

一类非牛顿流体模型解的渐近性态(英)

本文主要讨论一类带 $p \,\,( 1+\frac{2n}{n+2} \leq p<3 )\,$ 幂增长耗散位势的非牛顿流体模型解的渐近性态, 利用改进的 Fourier分解方法, 证明了其解在$L^2$ 范数下衰减率为 $(1+t)^{-\frac{n}{4}}$.     

不同类型蒸发源对平面夹具薄膜均匀性的影响

 分析了几种可能的实际蒸发源与薄膜均匀性的关系,其中包括扩展的平面蒸发源和曲面蒸发源。通过实验论证了薄膜均匀性对蒸发源尺寸和蒸发特性的依赖关系。得到的分析结果表明：当蒸发源半径和夹具高度的比值小于1/17时,蒸发源可以被视为一个点面源;大于 1/10时,应当把蒸发源视为面面源进行考虑。当挖坑深度和蒸发源半径的比值介于0和0.5之间时,挖坑对薄膜均匀性造成的影响基本可以忽略;大于0.6时,挖坑效应明显影响薄膜的均匀性。     

固体热载体热解淮南煤实验研究

自制处理量为1 kg煤的间歇式固体热载体热解装置,以淮南烟煤为原料,石英砂作热载体,对该煤进行热解特性评价实验。考察了热载体初始温度700 ℃～900 ℃、反应 4 min～16 min、煤粒径及热载体与煤的质量比5～9对热解产物产率和性质的影响。结果表明,提高热载体初始温度,气、液产率增加;延长反应时间和提高热载体比例,气体产率有所增加;热载体初始温度对热解气组成影响显著。提高热载体与煤的质量比和热载体初始温度,可以抑制半焦对热解反应器内壁的黏附。     

含钒杂多酸催化发烟硫酸中甲烷液相部分氧化反应

 以H5PV2Mo10O40 为催化剂,在发烟硫酸中进行了甲烷液相部分氧化,考察了催化剂用量、反应温度、反应时间和发烟硫酸浓度等工艺条件对反应收率的影响. 甲烷在反应中首先转化为硫酸甲酯,硫酸甲酯随后水解为甲醇. 对于甲烷液相部分氧化反应,发烟硫酸中游离的SO3是非常重要的影响因素. 在工艺条件为催化剂用量7.0 mmol, 反应温度473 K, 反应压力3.5 MPa, 反应时间3 h和发烟硫酸中SO3含量50%时,甲烷转化率可达48.5%, 目的产物甲醇收率为41.5%.     

厚度误差对THz-TDS的测量不确定度分析

阐述了基于菲涅尔公式的透射式太赫兹时域光谱系统提取样品光学常数的方法和原理,分析了样品厚度误差对THz-TDS测量不确定度的影响,并建立了相应的不确定度模型。进行太赫兹时域光谱测量实验,提取硅片在太赫兹波段的折射率,并计算了误差对提取样品折射率的影响。结果表明,随着厚度误差的增大,系统测量偏差也随之增大。对于较厚样品,相同厚度误差对其测量结果影响较小。样品厚度为994μm时,在厚度存在1μm的测量误差情况下,系统测量折射率的偏差为0.001 2,接近模型的仿真值。实验结果验证了厚度误差对测量不确定度模型的有效性,了解了厚度误差对系统测量结果的影响情况,对测量过程及结果分析具有一定的指导意义。     

双平面多圈注入模拟优化程序TPIS的初步开发与验证

为满足短时间内达到高累积流强要求,HIAF/BRing采用了一种新的注入方法--双平面相空间多圈注入。该注入方法与传统单平面多圈注入方法不同,而且在国际上是首次在实际项目中采用,尚无实际运行经验。因此,对注入过程进行程序模拟研究是验证双平面多圈注入方案可行性的必要手段。为详细模拟研究BRing双平面多圈注入过程,并克服已有程序跟踪速度较慢且注入参数修改不便的缺点,本文根据双平面多圈注入的特点,建立了双平面多圈注入模型,编写了双平面多圈注入模拟优化程序TPIS（Two-Planemultiturn Injection Simulation）。通过与ORBIT程序模拟结果对比,验证了TPIS程序模拟双平面多圈注入过程的正确性。在此基础上,在TPIS程序中加入了粒子群优化算法,并对BRing注入参数进行了优化。结果表明,TPIS程序可以对注入参数进行有效优化,经过优化后,束流损失减少了28%,最终剩余累积粒子数满足BRing的流强设计指标要求,进一步验证了双平面多圈注入设计的可行性。