127)I2在633nm波段的超精细强谱线及稳频半导体激光器

报道了观察到的碘分子（¹²⁷I₂）在633nm波段的5组超精细强谱线,并对每组谱线的频率间距及相应振转能级的跃迁强度作出了计算,结果和实验吻合得很好．利用计算结果,对这5组谱线对应的振转能带作出了甄别．由于这些新谱线比用于氦氖激光器稳频的R（127）11.5跃迁强几百倍,因此利用这些新谱线作为半导体激光稳频的参考谱线,得到了功率为3mW的激光输出,这种半导体激光可成为新型光频标． 关键词：     

强流脉冲电子束表面改性的物理模型及数值模拟

 推导出了强流脉冲电子束处理过程的应力场方程，利用数值模拟，得到了温度场和应力场的分布曲线，分别给出了熔化深度、升降温的速率及温度梯度的大小，准静态应力和热应力波的幅值、应力波的传播及反射过程，利用数值模拟结果对实验中观察到的实验现象熔化深度、材料表层及次表层数微米范围内组织结构的变化及数百微米的硬度提高等给出了解释。     

Dust Charging in Electronegative SiH4 Plasmas

We theoretically investigate the dust charging in electronegative silane (SiH4) plasmas, taking into account the effects of UV photodetachment. It is found that UV photodetachment could significantly lower the dust negative charge and even makes dust grains be positively charged under some special conditions. In addition, the other parameters, involving the negative ion and dust number densities, electron temperature and dust radius, have great effects upon the dust charging.     

高分子专业创新创业教育实践及实践基地建设研究

以我们学校高分子工程领域的人才培养模式为样本进行研究,探讨适合工科本科生及研究生培养的创新创业基地建设。通过对比分析国内创新创业实践教学基地建设研究,找出国内实践教学基地建设存在的问题,确定了解决这些问题的方法,从而使工科学生在理论知识和动手能力及创新思维积累方面得到一定的提高。培养出的本科生及研究生就业渠道拓宽。为企业培养了"留得住,用得上"的高分子材料工程实践和创新能力强的应用型高级人才。     

二维Rayleigh-Taylor不稳定性组分剖面与Atwood数相关性

由Rayleigh-Taylor不稳定性引起的湍流混合广泛存在于自然现象和工程应用中.在重力场作用下，将重流体置于轻流体之上，系统处于平衡状态.此时，在轻重流体界面处添加微小扰动，重流体向下形成尖钉，轻流体向上形成气泡，轻重流体进入湍流混合状态，系统失去稳定状态，进入失稳过程.组分剖面揭示了流场在任意时刻任意高度上的成分，从而揭示了Rayleigh-Taylor不稳定性的发展过程.利用计算流体力学软件CFD2模拟常加速度场下二维多模Rayleigh-Taylor不稳定性的发展，研究了重流体组分剖面随Atwood数的变化.文章对比了Atwood数为0.1，0.5，0.9这3种情况下质量分数剖面.在利用气泡高度h_b和尖钉深度h_s对高度做归一化之后，质量分数剖面不依赖于密度比.在不同密度比下，质量分数曲线都满足f_m~$\frac{1}{2}{\mathop{\rm erf}\nolimits} \left( {4\left( {\frac{{y-{h_{\rm{s}}}}}{{{h_{\rm{b}}}-{h_{\rm{s}}}}}-\frac{1}{2}} \right)} \right) + \frac{1}{2}$.      

Effect of coating thickness on the calibration and measurement uncertainty of a wide-band liquid crystal thermography

<正>The liquid crystal thermography is a high-resolution and non-intrusive optical technique for full-field temperature measurement.We present detailed calibration data for a wide-bandwidth thermochromic liquid crystal(TLC) to investigate the effect of the coating thickness on the hue-temperature characteristics and the measurement uncertainty of the TLC.It is found that the coating thickness has appreciable effect on the TLC hue-temperature curve.For TLC coatings with the thickness over 20μm,a thicker TLC coating shows a relatively smaller measurement uncertainty,but the effect of the coating thickness is non-distinctive on the measurement uncertainty.     

Propagation of Plasma Generated by Intense Pulsed Ion Beam Irradiation

Taking the calculation results based on the established two-dimensional ablation model of the intense-pulsed-ionbeam （IPIB） irradiation process as initial conditions, we build a two-dimensional hydrodynamic ejection model of plasma produced by an IPIB-irradiated metal titanium target into ambient gas. We obtain the conclusions that shock waves generate when the background pressure is around 133 mTorr and also obtain the plume splitting phenomenon that has been observed in the experiments.     

高中学生在化学学习中成绩分化的成因调查及对策研究

在多年的教学实践中,我发现学生在进入高中时,由于入学分数线的控制,化学成绩的差距并不大,但到高三毕业时,学生的化学成绩一般会出现较大的差距,而这差距是在高中阶段逐渐形成、拉大和稳定下来的。经观察,尽管差距出现的时问分布很广,但其问总会出现儿次较大的分化,引起分化的因素也是多重的。     

活性炭负载镍催化二苯并呋喃加氢的研究

以活性炭负载镍为催化剂,对二苯并呋喃催化加氢工艺进行了研究,通过GC/MS分析加氢产品的组成,对加氢组份含量变化趋势进行分析,并提出了加氢反应路线。同时对二苯并呋喃加氢制备2-环己基环己醇的反应进行了研究,考察反应温度、反应压力和反应时间对产品收率的影响。实验结果表明:在甲苯溶剂中,反应温度150℃,反应压力0.5 MPa,反应时间为12 h,产品收率为63.3%,纯度98%(GC)。产品结构经IR和~1H-NMR表征     

Numerical study on the characteristics of nitrogen discharge at high pressure with induced plasma

Based on the fluid theory of plasma, a model is built to study the characteristics of nitrogen discharge at high pressure with induced argon plasma. In the model, species such as electrons, N2+, N4+, Ar+, and two metastable states (N 2(A3∑u+), N2 (a1 ∑u-)) are taken into account. The model includes the particle continuity equation, the electron energy balance equation, and Poisson抯equation. The model is solved with a finite difference method. The numerical results are obtained and used to investigate the effect of time taken to add nitrogen gas and initially-induced argon plasma pressure. It is found that lower speeds of adding the nitrogen gas and varying the gas pressure can induce higher plasma density, and inversely lower electron temperature. At high-pressure discharge, the electron density increases when the proportion of nitrogen component is below 40%, while the electron density will keep constant as the nitrogen component further increases. It is also shown that with the increase of initially-induced argon plasma pressure, the density of charged particles increases, and the electron temperature as well as the electric field decreases.