10.6μm激光辐照下光学薄膜的微弱吸收测量

 建立了表面热透镜技术测量光学薄膜微弱吸收的实验装置，对10.6μm CO₂激光辐照下镀制在Ge基底上的不同厚度的单层ZnS，YbF₃薄膜，以及镀制在Ge基底上不同膜系的（YbF₃/ZnSe）多层分光膜的弱吸收进行了测量，并对实验结果作了分析和讨论。实验结果表明，利用本实验系统已测得的待测样品的最低吸收为2.87×10^-4，测量系统的灵敏度为10^-5。     

Formulation of a semi-analytical approach based on Gurtin variational principle for dynamic response of general thin plates

4 semi-analytical approach for the dynamic response of general thin plates which employes finite element discretization in space domain and a series of representation in time domain is developed on the basis of Gurtin variational principles. The formulation of time series is also investigated so that the dynamic response of plates with arbitrary shape and boundary constraints can be achieved with adequate accuracy.Project supported by the National Natural Science Foundation of China     

双参数地基上环板的非线性动力响应

研究双参数地基上环板的大挠度动力响应问题，给出了求解该问题的一种有效方法，即在空间域上运用摄动微分求积法处理非线性边值问题，在时间域上则以三点递推格式的Ｎｅｗｍａｒｋ－β法计算其动力响应。文中同时讨论了不同形式地基对环板在均布阶跃载荷作用下动力响应的影响。     

The effect of different temperature annealing on phase relation of LaFe11.5Si1.5 and the magnetocaloric effects of La0.8Ce0.2Fe11.5−xCoxSi1.5 alloys

The phase relation of LaFe_11.5Si_1.5 alloys annealed at different high-temperature from 1223 K (5 h) to 1673 K (0.5 h) has been studied. The powder X-ray diffraction (XRD) patterns show that large amount of 1:13 phase begins to form in the matrix alloy consisting of α-Fe and LaFeSi phases when the annealing temperature is 1423 K. In the temperature range from 1423  to 1523 K, α-Fe and LaFeSi phases rapidly decrease to form 1:13 phase, and LaFeSi phase is rarely observed in the XRD pattern of LaFe_11.5Si_1.5 alloy annealed at 1523 K. With annealing temperature increasing from 1573  to 1673 K, the LaFeSi phase is detected again in the LaFe_11.5Si_1.5 alloy, and there is La₅Si₃ phase when the annealing temperature reaches 1673 K. There almost is no change in the XRD patterns of LaFe_11.5Si_1.5 alloys annealed at 1523 K for 3-5 h. According to this result, the La_0.8Ce_0.2Fe_11.5−xCo_xSi_1.5 (0≤×≤0.7) alloys are annealed at 1523 K (3 h). The analysis of XRD patterns shows that La_0.8Ce_0.2Fe_11.5xCo_xSi_1.5 alloys consist of the NaZn₁₃-type main phase and α-Fe impurity phase. With the increase of Co content from x=0 to 0.7, the Curie temperature T_C increases from 180 to 266 K. Because the increase of Co content can weaken the itinerant electron metamagnetic transition, the order of the magnetic transition at T_C changes from first to second-order between x=0.3 and 0.5. Although the magnetic entropy change decreases from 34.9 to 6.8 J/kg K with increasing Co concentration at a low magnetic field of 0-2 T, the thermal and magnetic hysteresis loss reduces remarkably, which is very important for the magnetic refrigerant near room temperature.     

Analysis of the optical band positions for manganese (IV) ions in trigonal barium titanium hexafluoride and barium silicon hexafluoride crystals

The optical band positions (or crystal field energy levels) of manganese (IV) ions in trigonal barium titanium hexafluoride and barium silicon hexafluoride crystals are computed from the full diagonalization (of energy matrix) method founded on the two-spin–orbit-parameter model which consists of the effects from both the spin–orbit parameters of dⁿ ion and ligand ions. The computed results are in rational agreement with the experimental values. It is found that the large difference of first excited state splitting ΔE (²E) between the manganese (IV)-doped barium titanium hexafluoride and barium silicon hexafluoride crystals is owing mainly to the great difference of trigonal distortion between the fluorine octahedral clusters in the two host crystals.     

Fuzzy proximity spaces redefined

We use the concept ‘L-quasi-coincident’ in fuzzy set theory, to redefine L-fuzzy proximity space, and we study the following problems: proximity of L-fuzzy normal spaces, L-fuzzy filters, proximity neighborhoods and the L-fuzzy topology induced by the L-fuzzy proximity.     

He-HI复合物势能面及微分散射截面的理论研究

采用超分子单双迭代(包括非迭代三重激发)耦合簇理论CCSD(T)方法和由键函数3s3p2d1f组成的大基组, 计算得到了基态He-HI复合物相互作用的全程势能面. 该势能面上存在2个势阱, 分别对应于线性He-I-H和He-H-I构型, 势阱深度分别为4.473和2.996meV, He原子到HI分子质心的距离R分别为0.363和0.442nm. 使用Barker, Fisher和Watts提出的BFW势函数拟合计算得到的相互作用能数据, 获得了He原子与HI分子相互作用势的解析表达式. 在 关键词： He-HI复合物 势能面 微分散射截面     

新型两亲性大环多胺的合成

以亚胺基二乙酸和二乙撑三胺为原料, 通过关环等反应合成了一类侧链含有羟基的新型两亲性大环多胺. 其结构经MS, ¹H NMR, IR和元素分析等证实.     

H2O-DMF混合溶剂中[Co(N3)(NH3)5]2+与[Fe(H2O)6]2+间电子转移反应

研究了H₂O-DMF馄合溶剂中[Co(N₃)(NH₃)₅]²⁺被Fe(Ⅱ)还原的反应速度变化规律后,证实:当DMF的摩尔分数X_DMF<0.3时,表观速度常数K_aDD随着X_DMF增大而增大;X_DMF>0.3时,K_app随着X_DMF增大而减小;K_app与[H⁺]有良好线性关系。     

Electrochemical immune bioassay for the antigen–antibody interaction based on [Fe(CN)<Subscript>6</Subscript>]<Superscript>4-/3-</Superscript> and [AuCl<Subscript>4</Subscript>]<Superscript>-</Superscript> ions-derivated biomimetic interface

A simple and sensitive electrochemical immune bioassay for the detection of hepatitis B surface antigen (HBsAg), as a model, was developed based on [Fe(CN)₆]^4-/3- and [AuCl₄]^- ions-derivated biomimetic interface in this study. A layer of [Fe(CN)₆]^4-/3- film (i.e., Prussian blue, PB) was initially electrodeposited onto a glassy carbon electrode, and then [AuCl₄]^- ions were reduced under the potentiostat to form gold nanoparticles on the PB film. Finally, hepatitis B surface antibody (HBsAb) was adsorbed onto the nanogold surface. The performance and factors influencing the immunosensor were assessed and optimized. The proposed immunosensor exhibits a specific response to HBsAg in the range of 2.13–314.3 ng∙ml^-1 with a detection limit of 0.42 ng∙ml^-1. In addition, the developed immunosensor shows high sensitivity, good reproducibility, and long-term stability. Importantly, the ions-derivated biomimetic interface could be further extended for the immobilization of other proteins and biocompound.