One Novel Vanadium-Phosphate Cluster [PV_(2.5)O_(8.5)]-3.83{H_2O} with Three-Dimensional Architecture

A novel vanadium-phosphate compound [PV_2.5O_8.5]·3.83{H_2O}(1)was obtained from the hydrothermal reac-tion and structurally characterized by elemental analysis and single-crystal X-ray diffraction,which exhibited thatthe title complex crystallized in cubic space group I-43m with crystal data:a=1.6115(1)nm,V=4.1848(1)nm~3,Z=12,D_c=1.783 g/cm~3,F(000)=2278,R_1=0.0528,and wR_2=0.1329[I>2σ(I)](all data).The basic unit of{PV_2.5O_8.5}symmetrically extended to closed sphere-like structure of{P_4V_(10)O_(34)},which was further linked to in-terleaving three-dimensional network via sharing four phosphate through μ_3-oxygen atoms around the closedsphere-like structures.     

DNA/羟基磷灰石杂化膜修饰电极用于研究DNA与量子点的相互作用

首次利用溶胶-凝胶一步法制备了纳米多孔羟基磷灰石(HAp)-DNA杂化膜修饰玻碳电极,HAp优良的生物相容性和独特的吸附性可以将DNA固定在HAp多孔薄膜上,而DNA的大分子结构对HAp膜起到稳定剂的作用.采用循环伏安法和交流阻抗法系统地研究了电极表面固定DNA的稳定性以及固定的DNA与非电活性核壳型量子点CdTe/C...     

对数态Tavis-Cummings模型中辐射场的非经典性

本文研究了任意初态的双光子Tavis-Cummings模型的演化规律,作为例子,讨论了初始时刻两个原子均处于基态而光场为对数态时场的压缩效应,光子的聚束和反聚束效应.     

流动注射原子吸收光谱法测定高纯水合锑酸钠中微量钾

本文提出了一种流动注射原子吸收光谱法测定高纯水合锑酸钠中钾的方法，优化了仪器参数，考察了几种可能的干扰成分如Ｎａ＾＋、Ｓｂ（Ｖ）、酒石酸等，并提出了消除干扰的方法。结果表明通过在样品和标准液中加入一定量的Ｎａ＾＋后，匹配二者基体可以应用标准曲线法校正，方法的精密度（ＲＳＤ）为１．５％，回收率为９８．６％。     

扩展齐次平衡法与Backlund变换

将求解非线性演化方程的齐次平衡法进行了扩展,使其包含一个任意函数.此改进方法可得到耦合KdV-Burgers方程、KdV-Burgers方程、Boussinesq方程和一般KdV方程等许多非线性演化方程的Backlund变换和新的精确解.     

MULTIPLICITY OF NONNEGATIVE SOLUTIONS TO SECOND-ORDER SINGULAR DIFFERENTIAL EQUATION WITH INTEGRAL BOUNDARY CONDITIONS IN BANACH SPACES

This paper investigates the existence and multiplicity of nonnegative solutions to a singular nonlinear boundary value problem of second order differential equations with integral boundary conditions in a Banach space. The arguments are based on the construction of a nonempty bounded open convex set and fixed point index theory. Our nonlinearity possesses singularity and first derivative which makes it different with that in [10].     

Preparation of Polymeric Monolithic Column and Application to the Resolution of Aromatic Compounds in Capillary Electrochromatography

Polymeric monolithic capillary column-poly(GMA-co-EDMA-co-AMPS) was prepared and used for resolution of aromatic compounds ( benz alcohol, 2-phenylethanol, toluene, ethylbenzene ).     

D-山梨醇在纯水和卤化钠水溶液中293.15K～318.15K的稀释焓

应用流动式等温精密微量热技术测定4个温度(293.15、303.15、308.15和318.15 K)下D-山梨醇在纯水和卤化钠水溶液中的稀释焓.根据改进的McMillan-Mayer理论对所测数据进行关联,得到了表观摩尔稀释焓对浓度变化的经验方程和各阶焓相互作用系数(h2,h3和h4)和二阶熵相互作用系数(s2),根...     

激光二极管侧面抽运Nd∶YAG锁模激光器的研究

利用谐振腔的稳定条件对激光二极管侧面抽运的 Nd∶YAG锁模直腔的稳区特性和谐振腔内的光斑分布进行了分析。根据对腔参量的分析,选取合适的腔参量设计了一个简单的侧面抽运直腔,该谐振腔腔形简单,没有像散,振荡光模式好,有利于激光器的锁模运转。实验中采用国内自行研制的半导体可饱和吸收镜,实现了激光二极管侧面抽运半导体可饱和吸收镜锁模Nd∶YAG激光器的连续锁模运转,平均输出功率为 2 W,锁模脉冲宽度为10 ps,重复频率为100 MHz。结合实验结果进一步讨论了半导体可饱和吸收镜的一些参量如饱和恢复时间、调制深度等对实现稳定连续锁模的影响。     

一种四排短轴渐减椭圆空气孔阵列的单模单偏振光子晶体光纤

提出了一种新型的四排短轴渐减椭圆空气孔阵列的单模单偏振光子晶体光纤结构,并以完美匹配层为边界条件采用全矢量有限元方法研究了该光纤的各种特性及其各种参量随入射波长变化规律.研究表明,提出的光子晶体光纤结构是实现更宽带宽、色散平坦、单模单偏振运用的有效方案;在入射光波长为1.550μm时,单模单偏振光子晶体光纤的模式双折射...