苯乙烯-甲基丙烯酸羟乙酯无皂乳液聚合过程

苯乙烯-甲基丙烯酸羟乙酯无皂乳液聚合过程;成核机理     

光化学反应的从头算研究

光化学反应是最基本也是最重要的物理化学过程之一,在诸多领域有着广泛的应用。由于计算方法的限制以及光化学反应过程的错综复杂性,光化学反应机理的从头算研究是极具挑战性的国际前沿课题之一。本文综述了近20年来羰基化合物光化学反应机理从头算研究的一些进展,总结了羰基化合物电子激发态的特性和光化学反应过程的规律性,为深入研究光化学反应提供一些有用的信息。     

非晶态As_2S_8半导体薄膜的光激励现象的研究及应用

实验研究了非晶态As2S8半导体薄膜在紫外汞灯和He_Cd激光照射下的光诱导现象,证实了光照射后的As2S8薄膜的折射率增大,体积缩小,可见光吸收谱的吸收带蓝移。在此基础上,应用光折变效应试制了As2S8条波导,观测到As2S8条波导的光阻断效应,实现了光_光效应的开关功能。     

Study of BESⅢ MUC offine software with cosmic-ray data

Cosmic-ray data of 90 M events have been collected and used for calibration,alignment as well as detector tuning. A special tracking algorithm for the BESⅢ muon counter is developed and verified with Monte-Carlo simulation and then further confirmed with the cosmic-ray data. The obtained strip resolutions are in good agreement with the design values. A new alignment approach for the BESⅢ muon counter is confirmed with the cosmic-ray data and proposed to be used in future analysis of experimental data.     

Synchronization-based approach for parameter identification in delayed chaotic network

This paper introduces an adaptive procedure for the problem of synchronization and parameter identification for chaotic networks with time-varying delay by combining adaptive control and linear feedback. In particular, we consider that the equations $\dot {x}_i (t)$ (for $i =r+1, r+2,\ldots , n$) can be expressed by the former $\dot {x}_i (t)$ (for $i = 1, 2,\ldots , r$), which is not the same as the previous equation. This approach is also able to track changes in the operating parameters of chaotic networks rapidly and the speed of synchronization and parameter estimation can be adjusted. In addition, this method is quite robust against the effect of slight noise and the estimated value of a parameter fluctuates around the correct value.     

浸渍法制备钾基半焦在烟气脱硫中的循环再生

采用碳酸钾(K_2CO_3)与活化半焦通过浸渍法制备用于除去烟气SO_2的催化脱硫材料(K/ASC)。研究表明,将活化半焦(ASC)通过10%(质量分数)K_2CO_3改性获得钾基半焦(K10),其在120℃时具有良好的SO_2脱除效率,而且随着再生温度的升高(400～700℃),再生后K10的脱硫活性明显提高。K10(K10-R-600-n)的循环再生测试表明,样品在4次再生循环(K10-R-600-4)后具有最佳的脱硫性能,其硫容量为68.9 mg·g-1,比K10(55.4 mg·g-1)高24.37%。再生分析脱硫产物为物理吸附的SO_2,H_2SO_4和硫酸盐,再生后未分解的硫酸盐沉积会降低样品的脱硫活性。经过10次循环再生(K10-R-600-10),样品的硫容量为初始钾基半焦K10的70%。     

求解轴对称结构侧向冲击响应的一种快速算法

轴对称结构在侧向冲击载荷下的动力响应分析,一般采用解析、半解析法或者直接进行有限元数值模拟,这些方法均有一定的局限性.本文依据线性动力学问题的叠加原理,提出了一种基于有限元分析和线性叠加的快速算法.该方法首先采用多条母线对载荷进行离散,然后采用有限元计算结构在单个"载荷单元"作用下的动力响应,最后采用坐标旋转和线性叠加的方法计算得到结构在复杂分布载荷作用下的响应.算例表明,本文提出的算法是正确、有效的,并且具有快速、简便、灵活的特点.     

光学双向推扫空间相机的设计与实验

对于搭载单向积分TDI探测器的推扫式空间光学相机,探测器的积分方向是限制卫星敏捷机动任务规划的一项重要限制。利用在光学系统中加入法线方向与光轴成一定角度的平面镜可以改变系统物像正倒关系而不影响光程及像质的特点,设计了光学双向推扫系统。为了验证其方案的合理性,设计并装调了光学双向推扫相机工程样机。对该相机进行外景成像实验,成像实验结果与预期一致,光路切换效果明显,验证了其适应两种飞行方向的能力。总结工程样机研制过程,提出了后续需要考虑的问题,为后续光学双向推扫相机在型号上应用打下基础。     

Neutrino Emission and Cooling of Dark-Matter-Admixed Neutron Stars

The GW170817 binary neutron star merger event in 2017 has raised great interest in the theoretical research f neutron stars. The structure and cooling properties of dark-matter-admixed neutron stars are studied here using relativistic mean field theory and cooling theories. The non-self-annihilating dark matter(DM) component is assumed to be ideal fermions, among which the weak interaction is considered. The results show that pulsars J1614-2230, J0348+0432 and EXO 0748-676 may all contain DM with the particle mass of 0.2–0.4 GeV. However,it is found that the effect of DM on neutron star cooling is complicated. Light DM particles favor the fast cooling of neutron stars, and the case is converse for middle massive DM. However, high massive DM particles, around1.0 GeV, make the low mass(around solar mass) neutron star still undergo direct Urca process of nucleons at the core, which leads the DM-admixed stars cool much more quickly than the normal neutron star, and cannot support the direct Urca process with a mass lower than 1.1 times solar mass. Thus, we may conjecture that if small(around solar mass) and super cold(at least surface temperature 5–10 times lower than that of the usual observed data) pulsars are observed, then the star may contain fermionic DM with weak self-interaction.     

SPME/GC/MS分析小一点红挥发性化学成分

利用固相微萃取/气相色谱/质谱(SPME/GC/MS)联用技术对小一点红挥发性成分进行研究。共鉴定出25种化学成分,占挥发性总成分的91.99%。小一点红主要挥发性化学成分是β-月桂烯(51.18%),3,7,11,15-四甲基-2-十六烯-1-醇(21.55%),β-水芹烯(8.42%),n-十六酸(2.48%)等。