银、镧改性混合型吸热碳氢燃料裂解分子筛催化剂的研究

为提高吸热型碳氢燃料的吸热能效,制备了吸热型碳氢燃料NNJ-150和银、镧 离子交换改性USY,ZSM-5分子筛及混合分子筛,考察了NNJ-150在USHY,HZSM-5和 二者混合物以及银、镧改性混合分子筛催化剂上的裂解情况。结果表明,NNJ-150 在Ag-LaUSY + Ag-LaZSM-5（75：25）混合分子筛上裂解时,低碳烯烃选择性较高 （600 ℃,47.92%）,催化剂寿命较长(35 min以上）,催化性能比较稳定,可满 足冷却高超音速飞行器的要求。     

考虑公交港湾式停靠的多速混合城市交通流元胞自动机模型研究

在Nagel-Schreckenberg提出的元胞自动机模型基础上,建立了考虑公交车辆和港湾式公交停靠站的多速混合车辆单车道城市交通流元胞自动机模型.通过计算机模拟,给出了随机减速概率、混合车流密度、公交车辆平均停靠时间、公交车辆占有率和港湾式公交车站间距对混合车流速度和流量的影响图.对混合车流的特性进行了分析和讨论. 关键词： 元胞自动机 港湾式公交停靠站 混合交通流模型 计算机模拟     

铁性体中畴结构产生的热力学描述

在批判平衡态热力学局限性的基础上,采用不可逆过程热力学对铁性体中畴结构的产生做了动态描述.注意到了铁电与铁磁两种情况下的相似与区别.在铁弹情况下,出于客观的必要性,类比地引入了铁弹相变“分子场”的概念.明确了体系的有限性、过程的不可逆性与畴结构的产生的内在关联. 关键词： 铁性体 畴结构 不可逆性 对称性     

氢离子与里德伯原子碰撞中的电荷转移过程

应用双中心原子轨道强耦合方法研究了H⁺与里德伯态原子Li（5d）碰撞的电荷转移过程,计算了电子转移到氢原子各个n,l壳层（这里n为主量子数,l为角量子数）的态选择截面.结果发现,电荷转移的末态主要分布在与初态电子能量5d接近的n=4—7能级,该分布随碰撞能量的变化不大;但俘获末态的l分布对入射离子能量很敏感：在1 keV左右的低能时主要分布在高l的末态,随着碰撞能量增加峰值逐渐向低l方向移动,并在l= 关键词： 电子俘获过程 双中心原子轨道强耦合方法 态选择截面     

Efficient scheme of quantum SWAP gate and multi-atom cluster state via cavity QED

In this paper, we propose a physical scheme to realize quantum SWAP gate by using a large-detuned single-mode cavity field and two identical Rydberg atoms. It is shown that the scheme can also be used to create multi-atom cluster state. During the interaction between atom and cavity, the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay. With the help of our scheme it is very simple to prepare the N-atom cluster state with perfect fidelity and probability. The practical feasibility of this method is also discussed.     

掺铒的纳米相氟氧化物玻璃陶瓷的多光子红外量子剪裁

研究了掺铒的纳米相氟氧化物玻璃陶瓷(Er(3):FOV)的红外量子剪裁现象,测量了红外和可见的Er(3):FOV的荧光光谱.结果发现光激发²H_11/2能级的⁴ I_13/2→⁴I_15/2荧光跃迁的近似量子剪裁效率已达约186.28%.计算了有关的无辐射弛豫速率、自发辐射速率和能量传递速率,分析了有关的能量传递动力学过程,发现     

O3+与氦原子碰撞过程的CTMC计算

应用经典径迹蒙特卡罗方法研究了O3+离子与氦原子碰撞的各种反应过程.基于使用多个系统总能量U值,对初始电子的微正则分布进行了优化,使其更接近于量子力学的径向空间分布.作为检验,首先在独立电子模型近似下计算了He2+与氦原子碰撞的各种反应过程,通过与实验的比较,发现对氦原子靶,优化极大地提高了计算精度.计算了O3+与氦原子随入射离子能量变化的各种反应过程截面,特别是单电子丢失、双电子丢失的总截面,以及转移电离截面与单俘获截面的比值,并与实验进行了比较,发现单双电子丢失截面与实验符合得很好,但在大于200 keV/u的能区,转移电离截面与单俘获截面的比值与实验有较大的差距,这表明独立电子模型需要进一步改进.     

Density functional theory study on LaNi4.5Al0.5 hydride phase： electronic properties and sites occupation＊

In this paper the crystal structure, electronic structure and hydrogen site occupation of LaNi4.5Al0.5Hy hydride phase （y = 5.0, 6.0） have been investigated by using full-potential linearized augmented plane wave method. The hydrogen atoms were found to prefer the 6m, 12o and 12n sites, while no 4h sites were occupied. A narrowed Ni-d band is found due to the lattice expansion, the total density of states at EF increases with y, which indicates that the compounds become less stable. The interaction between Al and Ni, H plays a dominant role in the stability of LaNi4.5Al0.5 hydride phase. The smaller the shift of EF towards the higher energy region, the more stable the compounds will be. The obtained results are compared with experimental data and discussed in the light of previous works.     

Resonance problems for the p-Laplacian systems

Two existence theorems of the solutions are obtained for the p-Laplacian systems at resonance under a Landesman-Lazer-type condition by critical point theory.     

Simultaneous Determination of Lathyrane Diterpenoids by NPLC-DAD in the Seeds of Euphorbia lathyris and “ZI-JIN-DING” Pastille

A novel, simple and specific normal-phase liquid chromatography (NPLC) method has been developed for simultaneous determination of the four lathyrane diterpenoids, lathyrol-5,15-diacetate-3-benzoate (1, L₃), lathyrol-5,15-diacetate-3,7-dibenzoate (2, L₂), Δ6,17-epoxide-5,15-diacetate-3-phenylacetate (3, L₁), lathyrol-5,15-diacetate-3-nicotinate (4, L₈) in the hexane extract of the seeds of Euphorbia lathyris and “ZI-JIN-DING” pastille. The method showed good linearity for the four analytes (r ² > 0.99), the intra-day and inter-day variations (RSD) were less than 3%, and the recoveries ranged from 99.4 to 100.6%. This method was successfully used to determine the four lathyrane diterpenoids in the seeds of Euphorbia lathyris and “ZI-JIN-DING” pastille, and could be applied for their quality control.