流化床煤气化炉内脱硫的研究：I.台式流化床煤气化的炉内脱硫试验

采用台式流化床煤气化装置，研究了影响炉内脱硫效率的因素。炉内脱硫对高硫煤特别有效，脱硫效率可达９０％以上。所采用的二种石灰石和一种白云脱硫效率相近，按Ｃａ／Ｓ比比较则白云石稍好些。虽然脱硫效率随Ｃａ／Ｓ比增加而增加，但当Ｃａ／Ｓ比达到３后几乎不再增加。存在一个最佳脱硫操作温度。在非焙烧区，脱硫率随压力增加而下降，而在焙烧区脱硫率和压力几乎无关。测定了脱硫剂脱硫前后的孔容积分布，发现脱硫之后１￣３０     

条件概率知识梳理

条件概率是新课标新增的内容,比较抽象,难度较大,同学们接受起来比较困难,为此,本文埘条件概率的相关知识进行了梳理．     

原子能级粒子数热布局虚拟仿真实验的设计开发与教学实践

本虚拟仿真实验探究稀土离子热耦合能级粒子数随温度的变化规律。使学生掌握温度对原子能级粒子数的影响,并建立温度与荧光强度、荧光强度比之间的关系,深入探究温度对荧光强度和荧光强度比影响的区别和联系,加强对此部分理论知识的理解。进一步将理论知识进行实际应用,利用荧光强度比测量温度。通过本实验的学习,使学生对原子能级性质的理解更加深刻、掌握正确的荧光测试系统搭建过程,光路调节方法以及光谱数据的计算分析方法。激发了学生的学习兴趣,夯实了理论基础,并能学以致用,使学生对知识理解透彻,获得事半功倍的教学效果,仿真实验成绩优秀率达81%。     

OH+H2S→H2O+SH反应的模式特异性量子动力学研究

研究氢抽取反应OH+H₂S对于理解酸雨形成、空气污染和气候变化的原因具有重要意义. 本文在降维模型下使用量子含时波包方法研究了OH+H₂S→H₂O+SH反应的动力学行为. 研究表明,该反应在低碰撞能时表现出无垒反应的特征,而在高碰撞能下表现出具有显著势垒的激活反应的特征. 激发反应物H₂S分子的对称或反对称伸缩模式比激发弯曲模式更有效地促进了反应,该动力学特征可以通过各正则模式与反应坐标的耦合强度来解释. 此外,模式指定的反应速率常数表现出明显的非阿伦尼乌斯温度依赖性.     

基于三唑并噻二唑-香豆素体系的高选择性识别硫化氢比率型荧光探针的合成及应用

为了有针对性地高选择荧光识别硫化氢(H2S),以香豆素为核心组块与三唑并噻二唑芳香稠并杂环拼接,设计合成了 3个比率型荧光探针4a～4c,借助红外光谱(IR)、核磁共振(NMR)和高分辨质谱(HRMS)等对其进行了结构表征.通过荧光光谱法,研究发现3个探针均具有优良的荧光性能,说明探针分子整体结构设计合理,均表现出较高...     

碱熔-电感耦合等离子体发射光谱法测定大气颗粒物中的硅

建立了NaOH碱熔-电感耦合等离子体发射光谱法测定大气颗粒物中硅含量的方法.采用聚丙烯膜采集大气颗粒物,以NaOH为熔融剂,用HC1溶液进行酸化,并用电感耦合等离子体发射光谱在最佳波长251.611 nm下测定硅含量.结果 表明,当采样体积为150 m3(标准状态)时,大气颗粒物中硅元素的检出限为33 ng/m3,相对...     

牙本质中天冬氨酸消旋化程度的测定——手性毛细管气相色谱法与高效液相色谱法的比较

 应用手性毛细管气相色谱法（酸性异丙醇、三氟乙酸酐为衍生试剂）、高效液相色谱法（邻苯二甲醛－Ｎ－乙酰－Ｌ－半胱氨酸为手性衍生试剂）同时测定人类第一磨牙牙本质中天冬氨酸的消旋化程度，结果表明，两者均可有效地用于天冬氨酸对映体的分离测定，但气相色谱检测限（０．２ｐｍｏｌ）低于高效液相色谱（１．０ｐｍｏｌ），而变异系数（７％）、总分析时间（１００ｍｉｎ）均高于高效液相色谱（分别对应为４％，３１ｍｉｎ）。     

Calculation of Interaction Potentials between Spherical and Deformed Nuclei

The interaction potential for spherical-deformed reaction partners is calculated. The shape, separation and orientation dependence of the interaction potential and fusion cross section of the system ^32S＋^154Sm are investigated within the double-folding model of the deformed nuclei. The effective nucleon-nucleon interaction is taken to be the M3Y-Reid potential. The density is considered for three terms of the expansion using the truncated multipole expansion method, which is a deformed Fermi shape With quadrupole and hexadecapole for the density distribution of ^154Sm. It is found for the interaction potential that the height and the position of barrier strongly depend on the deformations, the orientation angle of the deformed nucleus, and hence produce great effects on fusion cross section. The integrated fusion cross section is in good agreement with the experimental data.     

φ150mm菲索干涉仪球面标准具结构分析与设计

在高精度的光学元件面形检测中,为了保证检测的精度,必须对高精度菲索干涉仪的标准镜的自重和温度变形进行严格地控制.针对高精度菲索干涉仪标准镜的精度要求,设计了一种新的标准镜装卡结构.采用有限元方法分析了标准镜在胶接方式下的表面变形情况,参考面表面变形峰谷(PV)值仅为9.6nm,均方根(RMS)值为2.1nm.同时对不同...     

Molecular dynamics simulations of A-DNA in bivalent metal ions salt solution

A-form DNA is one of the biologically active double helical structure. The study of A-DNA structure has an extensive application for developing the field of DNA packaging in biotechnology. In aqueous solution, the A-DNA structure will have a free transformation, the A-DNA structure will be translated into B-form structure with the evolution of time, and eventually stabilized in the B-DNA structure. To explore the stability function of the bivalent metal ions on the A-DNA structure, a series of molecular dynamics simulations have been performed on the A-DNA of sequence (CCCGGCCGGG). The results show that bivalent metal ions (Mg²⁺, Zn²⁺, Ca²⁺) generate a great effect on the structural stability of A-DNA in the environment of high concentration. As the interaction between metal ions and electronegative DNA chains, the stability of A-DNA in solution is gradually improved with the increasing solution concentration of ions. In metal salt solution with high concentration, metal ions can be easily distributed in the solvation shells around the phosphate groups and further lead to the formation of shorter and more compact DNA structure. Also, under the condition of the same concentration and valency of the metal ions, the stability of A-DNA structure is different. The calculations indicate that the structure of A-DNA in CaCl₂ solution is less stable than in MgCl₂ and ZnCl₂ solution.