介质初始密度对波阵面辐射特性的影响

 通过一维辐射流体动力学数值模拟,仔细研究了工作介质的初始密度对在氖中传播的强冲击波的波阵面辐射特性、波阵面亮度温度谱分布的作用。证明对于不同强度的冲击波,工作介质选用不同的初始密度,对其中传播的强冲击波波阵面辐射能力的提高是比较有效的。     

类氢离子的新势函数模型

给出了类氢离子的一个新势函数,该势函数包含了离子电离度效应,求出了相应的离子能级与波函数。用该理论研究了高离化态的类氢氟离子和类氢氖离子的部分激发光谱,计算结果与实验结果吻合很好。     

衍射光栅的实验设计

本文介绍了一种用可调角度双面镜产生相干光的干涉方法制做衍射光栅，所用仪器不多，光路简明     

掺氢改善大口径铜蒸气激光器的输出特性

研究了在大口径铜蒸气激光器（ＣＶＬ）的氖缓冲气体内掺入氢气对激光输出特性的影响。实验表明,掺入微量氢气使输出功率增加２５％,输出光束的空间特性得以改善。     

硅铝酸银分子筛吸附氖原子的第一性原理计算

采用基于第一性原理的密度泛函理论(DFT)和局域密度近似(LDA)方法,优化计算硅铝酸银分子筛吸附Ne原子体系的几何结构,能量,电子能带和电荷密度分布。结果表明,硅铝酸银为层状的周期结构,具有直径为a=5.390 Å的孔道。在分子晶体孔道的轴线上,桥O原子附近(I)和表面Ag+离子附近(II)的能量均有利于对Ne原子的吸附。尽管Ne(I)的能量最低,但是SiO4四面体排斥产生的能垒在动力学上不利于Ne原子的吸附。电子能带和电荷分布显示,Ne(II)原子主要受库仑极化的影响,其电子能带的能量较高,Ne(I)原子与桥O原子之间的共价作用能够降低对应的电子能带能量。     

Установка для получения изотоиа В10 методом обменной дистилляции комплекса (CH3)2O.BF3 1)

Zur Gewinnung der Neonisotope in gröβeren Mengen ist die Gegenstromdestillation bei 28 K die geeingnetste Methode. Um das Verfahren ökonomisch durchzuführen, wurden Verdampfer und Kondensator mit dem Neonkältekreislauf gekoppelt. Die Schüttung der KOlonne besteht aus V2A-Wendeln (1,6 mm × 1,8 mm × 0.2 mm) und hat eine Höhe von 6000 mm. Bei zweimaliger Destillation wurden folgende Konzenbtrationen eereicht: für ²²Ne 99,3% (maximal 99,5%), für ²⁰Ne 99,97–99,99%. ²⁴Ne wurde auf 1.2% (d. h. etwa das Vierfache der natürlichen Konzentration) angereichert.     

Ab initio potential energy curve for the neon atom pair and thermophysical properties for the dilute neon gas. II. Thermophysical properties for low-density neon

A neon–neon interatomic potential energy curve determined from quantum-mechanical ab initio calculations and described with an analytical representation (R. Hellmann, E. Bich, and E. Vogel, Molec. Phys. 106, 133 (2008)) was used in the framework of the quantum-statistical mechanics and of the corresponding kinetic theory to calculate the most important thermophysical properties of neon governed by two-body and three-body interactions. The second and third pressure virial coefficients as well as the viscosity and thermal conductivity coefficients, the last two in the so-called limit of zero density, were calculated for natural Ne from 25 to 10,000 K. Comparison of the calculated viscosity and thermal conductivity with the most accurate experimental data at ambient temperature shows that these values are accurate enough to be applied as standard values for the complete temperature range of the calculations characterized by an uncertainty of about ±0.1% except at the lowest temperatures.     

大气压氖气介质阻挡放电脉冲等离子射流特性

采用自行研制的低造价、小体积、可产生幅值0~35 kV、重复频率1 kHz的高压s脉冲电源,设计了一套以大气压氖气为工作气体的介质阻挡放电（DBD）等离子体射流源,通过测量并计算放电过程中的电压-电流波形、拍摄放电图像、光谱分析等手段,对电压幅值、气体流速对氖气等离子体射流特性的影响进行了研究。结果表明:s脉冲电源激励下大气压氖气DBD能产生锥状的等离子射流且其等离子强度适中;s脉冲电源电压幅值的快速上升,可在放电空间瞬间施加高的过电压,能有效促进放电功率、电子密度、电子激发温度和射流长度的增加;工作气体流速的增加使得放电功率、电子激发温度和电子密度减小,而射流长度变化很小;一定条件下,能形成长距离的射流。     

Dielectric response of makrofol-KG polycarbonate irradiated with 145 MeV Ne6+ and 100 MeV Si8+ ions

The passage of heavy ions in a track detector polymeric material produces lattice deformations. These deformations may be in the form of latent tracks or may vanish by self annealing in time. Heavy ion irradiation produces modifications in polymers in their relevant electrical, chemical and optical properties in the form of rearrangement of bonding, cross-linking, chain scission, formation of carbon rich clusters and changes in dielectric properties etc. Modification depends on the ion, its energy and fluence and the polymeric material. In the present work, a study of the dielectric response of pristine and heavy ion irradiated Makrofol-KG polycarbonate is carried out. 40 μm thick Makrofol-KG polycarbonate films were irradiated to various fluences with Si⁸⁺ ions of 100 MeV energy from Pelletron at Inter University Accelerator Centre (IUAC), New Delhi and Ne⁶⁺ ions of 145 MeV from Variable Energy Cyclotron Centre, Kolkata. On irradiation with heavy ions dielectric constant (ɛ′) decreases with frequency where ɛ′ increases with fluence for both the ions. Variation of loss factor (tan δ) with frequency for pristine and irradiated with Si ions reveals that tan δ increases as the frequency increases. Tan δ also increases with fluence. While Ne irradiated samples tan δ shows slight variation with frequency as well as with fluence. Tan δ has positive values indicating the dominance of inductive behavior.      

Effect of pressure and temperature on the adsorption equilibrium in the H2-Ne-zeolite NaA system

The effect of the temperature, pressure, and gas-phase composition on the parameters of the adsorption equilibrium in a zeolite NaA-neon-hydrogen system was studied. From the results obtained optimum conditions for the adsorption separation of a binary neonhydrogen gas mixture were found.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 611–612, March, 1993.