冷凝法油气回收技术与应用

油品在储运和销售过程中部分轻烃组分挥发进入大气,造成资源浪费和环境危害.油气回收既可实现油气污染治理又能产生可观的经济效益.结合中国油气储运和销售环节的现状以及相关技术的发展,对几种油气回收的方法进行了对比分析,认为采用多元工质复叠(或自复叠)制冷技术的冷凝法具有较好的经济性和可靠性.介绍了自主研发的冷凝式油气回收设备...     

核电厂更衣室冷冻水系统优化设计

针对在建核电厂的更衣室冷冻水系统,通过计算分析,并结合工程实践经验,对原有设计进行了优化和改进.总结出适用于核电厂冷冻水系统设计的有用结论,包括:系统供回水温度的适当调整、气源热泵技术的有效利用以及模块化冷水机组的合理引入.这些结论目前均已有效地应用于在建核电项目的施工设计中,同时,对于国内其他行业内的冷冻水系统设计也...     

Atomic NOON state generation in distant cavities by virtual excitations

A general scheme of generating NOON states of virtually-excited 2N atoms is proposed. The two cavities are fibre-connected with N atoms in each cavity. Although we focus on the case of N = 2, the system can be extended to a few atoms with N 〉2. It is found that all 2N atoms can be entangled in the form of NOON states if the atoms in the first cavity are initially in the excited states and atoms in the second cavity are all in the ground states. The feasibility of the scheme is carefully discussed, it shows that the NOON state with a few atoms can be generated with good fidelity and the scheme is feasible in experiment.     

Research on high-voltage 4H-SiC P-i-N diode with planar edge junction termination techniques

The planar edge termination techniques of junction termination extension (JTE) and offset field plates and field-limiting rings for the 4H-SiC P-i-N diode were investigated and optimized by using a two-dimensional device simulator ISE-TCAD10.0. By experimental verification, a good consistency between simulation and experiment can be observed. The results show that the reverse breakdown voltage for the 4H-SiC P-i-N diode with optimized JTE edge termination can accomplish near ideal breakdown voltage and much lower leakage current. The breakdown voltage can be near 1650 V, which achieves more than 90 percent of ideal parallel plane junction breakdown voltage and the leakage current density can be near 3 × 10-5 A/cm2.     

Atomic N00N state generation in distant cavities by virtual excitations

A general scheme of generating N00N states of virtually-excited 2N atoms is proposed. The two cavities are fibre-connected with N atoms in each cavity. Although we focus on the case of N=2, the system can be extended to a few atoms with N>2. It is found that all 2N atoms can be entangled in the form of N00N states if the atoms in the first cavity are initially in the excited states and atoms in the second cavity are all in the ground states. The feasibility of the scheme is carefully discussed, it shows that the N00N state with a few atoms can be generated with good fidelity and the scheme is feasible in experiment.     

元素替代对Mg2NiH4释氢性能影响的第一性原理研究

采用基于密度泛函理论（DFT）的平面波赝势（PWP）方法,研究了元素替代对Mg2NiH4释氢性能的影响. 计算给出了晶胞参数、电子态密度、原子间的键序和生成焓,分析了氢化物的结构稳定性和原子间成键作用之间的关系. 计算结果表明,生成焓的计算值随替代元素M(Ti,V,Cr)的变化趋势和实验测定的结果一致,且Ti的替代较好地降低了Mg2NiH4的结构稳定性,提高了Mg2NiH4的释氢性能. 分析电子结构可得,Ni(h)–H和M–H间的相互作用是影响Mg2NiH4结构稳定性的主要因素,替代元素正是通过改变M–H的相互作用来提高Mg2NiH4的释氢性能.     

新奇粒子和奇特物质的实验探索

根据理论预言及实验兴趣,我们设计了一系列实验,对轴子、重中微子、磁单极子、小电荷粒子和超重核块进行寻找。本文系统地报告这一系列实验工作,并且给出这些新奇粒子和奇特物质的限。     

超重核合成进展

介绍了超重核合成的历史和现状 ,对现有的超重核合成的实验情况和理论模型做了评述 ,指出了在国内利用现有设备和放射性核束装置开展超重核合成可能的方案     

光杠杆实验中尺读望远镜视场部分不清晰的成因和改善

对光杠杆实验中经常见到的尺读望远镜视场部分不清晰的成因作了深入的分析和实验验证,证明是因为背景光进入尺读望远镜,降低了直尺在尺读望远镜中的像的对比度所致,提出慢慢将物镜向像不清晰那个方向调整就能改善.     

应变Si/(001)Si1-xGex电子迁移率

依据离化杂质散射、声学声子散射和谷间散射的散射模型,在考虑电子谷间占有率的基础上,通过求解玻尔兹曼方程计算了不同锗组分下,不同杂质浓度时应变Si/(001)Si_1-xGe_x的电子迁移率.结果表明:当锗组分达到0.2时,电子几乎全部占据Δ₂能谷;低掺杂时,锗组分为0.4的应变Si电子迁移率与体硅相比增加约64%;对于张应变Si NMOS器件,从电子迁移率角度来考虑不适合做垂直沟道.选择相应的参数,该方 关键词： 电子谷间占有率 散射模型 锗组分 电子迁移率