铁钼铈变换催化剂催化性能的研究

首次系统地研制了ＭｏＯ３和ＣｅＯ２为助剂并制备出最佳组成的无铬铁系变换催化剂，同时，动用ＴＥＭ．ＸＲＤ及比表面测定技术对催化剂的表面性质及ＭｏＯ３ＣｅＯ２的助催作用进行了研究。     

中子皮厚度测量探针对核物质状态方程的依赖性

利用同位旋相关的量子分子动力学模型模拟了 4He + 208 Pb的碰撞反应,发现中子质子产额比与 208 Pb的中子皮之间存在很好的线性关联,中子质子产额比可以作为中子皮厚度测量的一个探针。选取量子分子动力学模型中核物质状态方程的两套不同势参数进行模拟,通过对比发现,中子皮的厚度测量探针中子质子产额比对核物质状态方程中选择软势和硬势非常敏感,相同反应条件下,软势比硬势计算所得的中子质子产额比要低。无论选择何种状态方程参数,中子质子产额比与中子皮之间都存在线性关联。The reaction system of 4He + 208Pb has been simulated by Isospin-dependent Quantum Molecu-lar Dynamics (IQMD) mode and it was found that the neutron-to-proton yield ratio (Rnp) has a good linearrelationship with the neutron skin thickness of 208Pb. Therefore Rnp could be taken as a probe of neutron skin thickness of 208Pb. Using two sets of parameters for the nuclear equation of state (EOS) in IQMD model, it shows that Rnp is sensitive to nuclear equation of state. The calculation results of Rnp with the soft EOS is lower than the hard EOS. No matter which kind of EOS parameter has been chosen, however, Rnp holds a good linear correlation with the neutron skin thickness.     

湖南省广播电视数字微波网络提质改造工程

湖南省广播电视数字微波网络提质改造工程,结合湖南多山的地理条件、以及市(州)高楼建设频繁的特点,基本沿用原数字微波路由,甩开市城市站点,完善成一大一小两个环形加星形拓扑的网络结构,采用最新IP技术设备,AVS+的编解码技术,确保了整个工程的质量、各项技术指标完全符合国家标准,达到了预期的效果.     

基于Ring-down光学谐振腔的新型瓦斯传感器

提出将光谱吸收型传感技术和Ring-down光学谐振腔理论相结合的设计思路,将吸收光强与气体含量之间的定量关系与Ring-down光学谐振腔理论有机结合起来,设计了基于Ring-down光学谐振腔理论的光学瓦斯(甲烷)气体传感器气体吸收腔,以解决传统瓦斯传感器因为气体的谱宽很窄而难以提高微弱信号检测精度和灵敏度的问题....     

丙烯酸气相热解机理的理论探讨

用自洽场分子轨道法(半经验AM1法及从头算HF/3-21G法)研究了基态丙烯酸脱羧的反应途径. 计算结果表明, 除前人从理论上已经得到的一步反应途径外, 尚有一个与之竟争的二步反应途径, 且两步反应的总速率大于一步反应的. 计算所得的反应速率常数很小, 与实验结果(丙烯酸在827 K仅有25%左右发生脱羧, 脱水等反应)是一致的. 研究表明, 有较稳定的中间体存在, 有可能在实验中被检测到, 但有待于进一步验证.     

Isoscaling behavior studied by HIPSE model

The isoscaling behavior in the reaction system of 58,64Ni + 9Be has been studied by using the heavy-ion phase-space exploration(HIPSE) model. The extracted isoscaling parameters α and β for both heavy and light fragments for HIPSE model calculations are in good agreement with recent experimental data. The investigation shows that the parameters in the HIPSE model have some effect on the isoscaling parameter. The isoscaling parameters for hot and cold fragments have been extracted.     

Scaling property in one-nucleon removal reactions induced by exotic nuclei

Assuming a core plus valence nucleon structure, one-nucleon removal reaction is investigated within the framework of few-body Glauber theory. Fermi-type distribution is used for the core density, while the wavefunction of the valence nucleon is calculated by solving the single particle eigenvalue problem of the SchrSdinger equation with the Woods-Saxon potential. The parallel momentum distribution （P//） of the fragments is calculated for isotopes with 3 〈 Z 〈 18. A remarkable scaling property is observed from the dependence of the dimensionless quantity P^2 v/R^2 e on the full width at half maximum of the parallel momentum distribution （FWHMp//）. R^2 v/R^2 c is a measure of the exotic extent of the nuclear halo. Based on the obtained 2 2 scaling law, FWHMp// can be used as an experimental observable to extract R^2 v/R^2 c and measure the exotic extent for the nuclear halo.     

Isoscaling Behavior in ^48,40Ca＋^9Be Collisions at Intermediate Energy Investigated by the HIPSE Model

The fragment production cross sections for 140 Me V/nucleon ^48,40 Ca^＋9 Be reactions are calculated by the heavyion phase space exploration （HIPSE） model. Isoscaling behavior is observed. The isoscaling parameters a and β for both heavy and light fragments from the HIPSE model calculations are in good agreement with the experimental data. It is shown that the potential parameters in the HIPSE model have very little effect on the isoscaling parameters. The effect of the excitation energy and evaporation on the isoscaling behavior is also discussed.     

铁系催化剂上乙苯与CO2氧化脱氢反应

采用浸渍法和溶胶-凝胶法制备了三种含Mg,Fe和Al量相同的Fe2O3-MgO/γ-Al2O3,Fe2O3/MgAl2O4和MgFe0.1Al1.9O4催化剂,在580°C考察了它们催化乙苯与CO2氧化脱氢反应性能,并采用X射线衍射,表面元素分析,H2-程序升温还原和CO2-程序升温脱附等技术对催化剂体相及表面性质进行了表征.结果表明,催化剂制备方法影响Fe物种的存在形态,进而影响催化剂的稳定性和活性.采用浸渍法制备的Fe2O3/MgAl2O4催化剂含有高度分散的Fe2O3活性物种,该物种具有较好的初活性,但是稳定性较差;而采用溶胶-凝胶法制备的MgFe0.1Al1.9O4催化剂中,Fe物种主要以同晶取代的形式存在于尖晶石骨架中,因而具有较高的乙苯与CO2氧化脱氢催化活性和稳定性.