Picosecond Stimulated Raman Scattering of SrWO4 Crystal

Stimulated Raman scattering （SRS） of picosecond pulses is investigated in a new crystal SrWO4. The second harmonic generation of a mode-locked Nd：YAG laser system is used as the pump source. In an external singlepass configuration, the SRS thresholds for the first to the fourth Stokes lines are measured. For the first Stokes line, the steady-state gain coefficient of the SrWO4 crystal is calculated to be 15.96cm//GW. In our experiment, as many as five Stokes lines （559.23 nm, 589.61 nm, 623.49 nm, 661.50 nm, 704.44 nm） and three anti-Stokes lines （506.97nm, 484.34 nm, 463.65nm） are observed, and the total conversion efficiency is as high as 62%.     

室内空间测量定位系统扫描激光面模型优化

针对室内空间测量定位系统(wMPS)交会测量模型将发射站扫描激光面视为理想平面的现状,研究了一种基于高精度转台的激光面面型视觉评估方法。根据评估结果引入线性折面判断机制,优化重建了wMPS扫描激光面数学模型,以减小交会测量模型中的系统误差。结合大空间高精度坐标场对新模型进行了评估。结果表明,所研究模型对实际光面的拟合效果较好,有助于提升wMPS的测量精度。     

Analysis of Charge State Distribution by Non-Local Thermodynamic-Equilibrium Spin-Orbit-Split-Array Collisional Radiative Model

A collisional radiative model based on the spin-orbit-split-arrays is used to determine the charge state distribution of gold plasmas. The ab initio atomic structure code of Cowan and the spin-orbit-split-array model were used to calculate all the emission spectra of the different gold species, and a non-local thermodynamic-equilibrium model was coupled to calculate the ion populations at a given plasma density and electron temperature. The charge state distribution and other plasma parameters were determined by comparing the experimental spectra with the theoretical simulated soectra of gold plasmas.     

用多指标正交设计法,调试三角带底胶配方,降低三角带成本

课题的确定 近来年,由于各种天然胶、合成胶及橡胶配合剂涨价,橡胶制品成本相应提高.为使产品在市场上具有较强的竞争能力,必须在保证产品质量的前提下,降低产品的成本.三角带是化工部在北方橡胶厂的定点产品,在该厂产品(占很大比重.为此,我们用多指标正交设计法对三角带底胶配方进行了调试,降低了底胶成本,取得了一些经济效益. 一、试验目的及考核指标 目的:降低产品成本,同时使质量优化. 二、确定因素水平表 1因素确定的依据 在胶料配方中,生胶的品种起关键作用.生胶的性质决定混合胶的基本性能且由于生胶在配方中重量比很大(通常大于40%)…     

利用Ag(Ⅰ)对过硫酸铵氧化还原型罗丹明B的催化效应光度法测定痕量银

本文研究了在活化剂α,α′-联吡啶存在下,银(Ⅰ)对过硫酸铵氧化还原型罗丹明B这一显色反应的催化效应,采用固定时间法建立了一个新的测定痕量银的催化光度法。方法的灵敏度为2.010~(-4)μg/mL,测定范围为0—2μg/25mL,回收率在86.6—100％之间。     

多相催化反应动力学的研究方法进展

概述了多相催化反应动力学的几种研究方法及其特点，适用性，着重介绍了ＳＳＩＴＫＡ技术和ＴＯＦ的速率表征。     

双参数形变谐振子湮没符高次幂本振态的产生

提出了由ｑｓ相干态通过正交对称化方法产生双参数形变谐振湮没算符高次幂本振态的一般方法，求出了交对称化矩阵，找到了ａ＾ｋ本征态的ｑｓ相干态源泉。     

关于复函数高阶微分“中值点”的渐近性

给出了复函数的高阶微分中值公式,并利用Stirling数这个工具获得了该公式“中值点”的渐近性.     

SYNTHESIS AND CHARACTERIZATION OF SIDE CHAIN LIQUID CRYSTATALLINE POLYSILOXANES CONTAINING BENZYL ETHER LINKING UNITS

Side chain liquid crystalline polysiloxanes containing benzyl ether linkingunits were synthesized by the hydrosilylation of poly (methylhydrosiloxane) with a series of4-(4-alkoxybenzyloxy)-4'-allyloxybiphenyl monomers [4-(4-methoxybenzyloxy )-4'-allyloxy-biphenyl(M_1), 4-(4-ethoxybenzyloxy)-4'-allyloxybiphenyl (M_2), 4-(4-propoxybenzyloxy)-4'-allyloxybiphenyl (M_3), 4-(4-butoxybenzyloxy)-4'-allylox(M_4), 4-(4-pentoxy-benzyloxy)-4'-allyloxybiphenyl (M_5), 4-benzyloxy-4'-allyloxybiphenyl (M_6)]. The phasebehavior of monomeric and polymeric liquid crystals was characterized by differential scan-ning calorimetry and optical polarization microscopy where the groups are ranged frommethoxy to pentoxy Both the monomeric and polymeric liquid crystals exhibit 1iquidcrystal behaviors.