Submillimeter-wave spectrum of carbonyl sulfide: rare isotopic species

Rotational spectra of four rare isotopic species of OCS were observed in the 110-690 GHz region with a source-modulated submillimeter-wave spectrometer. Spectral lines of ¹⁸O¹³CS, O¹³C³⁶S, ¹⁸OC³⁶S, and ¹⁸O¹³C³⁴S were measured in their natural abundances, 21.4, 1.51, 0.29, and 0.95 ppm, respectively. The rotational constants and centrifugal distortion constants were precisely determined from observed line frequencies by least squares methods. In order to facilitate sensitivity examination in the submillimeter-wave region, transition frequencies and peak absorption coefficients were calculated and tabulated for the spectral lines of the four species up to the 1000 GHz region.     

A COLLOCATION METHOD FOR THE CONDUCTIVITY PROBLEM WITH DISCONTINUOUS COEFFICIENT

In this paper, a new collocation BEM for the Robin boundary value problem of the conductivity equation ▽(γ▽u) = 0 is discussed, where the 7 is a piecewise constant function. By the integral representation formula of the solution of the conductivity equation on the boundary and interface, the boundary integral equations are obtained. We discuss the properties of these integral equations and propose a collocation method for solving these boundary integral equations. Both the theoretical analysis and the error analysis are presented and a numerical example is given.     

同轴电缆自感系数问题的两种新解法

本文对圆柱型同轴电缆自感系数问题进行了深入的讨论．文中把同轴电缆看成是由大量的“子回路”并联构成“单匝回路”，从子回路间的磁耦合角度出发提出了两种全新的同轴电缆自感系数的求解方法。     

γ-LiAlO2晶体生长、改性和热学性质研究

采用快速提拉法生长出了透明、完整的γ-LiAlO₂晶体，但是晶体的高熔点和易 挥发性限制了γ-LiAlO₂晶体质量.采用气相传输平衡法（vapor transport equilibra tion technique,VTE）工艺对晶体改性，半高宽（FWHM）值从1169arcsec降至442arcsec，继续升高VTE处理温度至1300℃，FWHM值反而升高至552arcsec.快速提拉法生长出来晶体，100］方向和［001］方向的热膨胀系数分别为172398×10^-6/K，107 664×10^-6/K.经过三步VTE处理后［100］和［001］方向热膨胀系数降至16 6539×10^-6/K和101784×10^-6/K. 关键词： 2')" href="#">γ-LiAlO₂ 气相传输平衡法 热膨胀系数     

采暖居住建筑实施节能65%--围护结构传热系数的确定

以围护结构的耗热量指标、传热系数限值和门窗空气渗透耗热量为重点,对严寒地区居住建筑实施节能65%进行了分析,提出围护结构各部分的传热系数限值.对围护结构如何实现节能65%的要求,从围护结构构造和技术角度进行了讨论;并阐述降低门窗部位的空气渗透耗热量是下一步节能的关键.     

相位倾斜对L-G光束焦开关的影响

研究了相位倾斜L—G光束通过光阑——透镜分离系统的焦开关现象。着重研究相位倾斜对焦开关现象的影响。研究结果表明，相位倾斜影响了相对焦移量、相对跃变量和焦开关发生的位置，同时也影响焦开关出现时截断参数的取值范围。另外，截断参数也会影响焦开关发生的位置。     

高粘度液体粘滞系数测定仪

本文对上海教学仪器厂生产的旋转式粘度计进行了改进，减小了实验误差，对实验教学和实际应用都很有意义。     

星际型CH_3CN－H_2含超精细能级的碰撞跃迁速率系数的理论计算

利用ＩＯＳ近似模型，计算了星际分子云条件下Ｅ型ＣＨ３ＣＮ－Ｈ２含超精细能级的的碰撞跃迁速率系数。其温度范围是２０Ｋ－１４０Ｋ。为研究分子云与恒星形成区的物理、化学性质提供了大量有用的基础分子数据。     

二氧化碳在正辛烷、正十四烷中对流扩散系数的测定

 建立了由细管驱替实验测定驱替气体在油藏流体中的对流扩散系数的测定方法。测定了CO₂分别在正辛烷、正十四烷中的对流扩散系数，并研究了驱替速度及正辛烷、正十四烷分子量对扩散的影响。