一系列薯蓣皂甙元-α-L鼠李糖基-(1→2)和(1→4)-β-D葡萄糖甙的1H和13C NMR归属

用同核和异核二维核磁共振方法全归属了一系列合成的薯蓣皂甙元-α-鼠李糖基-β-D葡萄糖甙的¹H和¹³C核磁共振谱线.这些薯蓣葡萄糖甙是薯蓣皂甙元-β-D葡萄糖甙(1),薯蓣皂甙元-α-L鼠李糖基(1→2)-β-D葡萄糖甙(2),薯蓣皂甙元-α-L鼠李糖基(1→4)-β-D葡萄糖甙(3),薯蓣皂甙元[-α-鼠李糖基-(→2)]-α-L鼠李糖基→-(1→4)-β-D葡萄糖甙(4)以及薯蓣皂甙元[-α-L鼠李糖基-(1→2)]-β-D阿拉伯糖基-(1→4)-β-D葡萄糖甙(5).     

一系列薯蓣皂甙元-β-D葡萄糖基-(1→2)和(1→3)-β-D葡萄糖甙的1H和13C NMR归属

用同核和异核二维核磁共振方法全归属了一系列合成的薯蓣皂甙元-β-D葡萄糖甙的¹H和¹³C核磁共振谱线.这些薯蓣葡萄糖甙是薯蓣皂甙元-β-D葡萄糖甙(1),薯蓣皂甙元-β-D葡萄糖基-(1→2)-β-D葡萄糖甙(2),薯蓣皂甙元,-β-D葡萄糖基-(1→3)-β-D葡萄糖甙(3),薯蓣皂甙元[-β-D葡萄糖基-(1→2)-β-D葡萄糖基(1→3)-β-D葡萄糖甙(4)以及薯蓣皂甙无[-α-L鼠李糖基-(1→2)]-β-D葡萄糖基-(1→3)-β-D葡萄糖甙(5).     

红外气体浓度测试仪设计

在实验室条件下采用红外光谱对气体浓度进行定量分析的技术已很成熟,但是,适用野外环境条件下进行气体浓度精密测量的仪器并不多见。本文设计的仪器是文献〔３〕所述的一种便携式红外气体浓度测试仪器的改型,测量范围０－１００％,精度比文献〔３〕所述红外气体浓度测试仪器有所提高,且使用方便,工作稳定,数据可靠。     

TOMOGRAPHY FORMULA FOR BIOCHEMICAL IMAGING OF THIN TISSUE WITH DIFFUSE-PHOTON DENSITY WAVES

Using the transport theory to describe the near infrared light propagating in tissue with finite parallel-plane geometry, and taking the zero-boundary condition, we obtain the analytical expression of average photon density and Green's function incorporating the boundary effects in the homogeneous tissure. Making use of perturbation theory we also obtain the analytical expression of scattered wave induced by the heterogeneity, and present the 2-dimensional spatial transform of scattered wave with respect to transverse coordinate. If the information of heterogeneity on depth and thickness is available, diffraction tomography formula is presented to save the time of image reconstruction; if the information is unknown, we suggest to obtain the inhomogeneous function from the one-dimensional integral equation of 2-dimensional spatial transform of scattered wave applying the direct matrix method or iterative method for image reconstruction. This approach avoids directly solving three-dimensional integral equation of scattered wave. In our proposed approach the strong points of the direct matrix method, iterative method, and diffraction tomography are fully combined.     

FTIR study of hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide,and acetonitrile in supercritical CO_2

FTIR spectroscopy was used to study the hydrogen bonding of stearic acid with ethanol, dimethyl sulfoxide (DMSO),and acetonitrile in supercritical CO_2 at 318.15 K, and 12.5 and 16.5 MPa. The concentrations of the cosolvents range from 0—0.6 mol·L~(-1). The area percentage of absorption bands for hydrogen-bonded and nonhydrogen-bonded species was obtained from the IR spectra. The acid and the cosolvents can form hydrogen bond even when their concentrations are very low. At fixed solute concentration, the extent of hydrogenbonding increases with cosolvent concentration. At higher ethanol concentrations, it seems that one stearic acid molecule can hydrogen bond with more than one ethanol molecules simultaneously. It is seen that the strength of the hydrogen bond formed by the acid and the cosolvents is in the order: DMSO>ethanol>acetonitrile.     

Solubility of stearic acid in supercritical CO_2-acetonitrile mixtures

The solubility of stearic acid in supercritical CO2 with acetonitrile (CH3CN) cosolvent was measured at 318.15 K in the pressure range from 9.5 to 16.5 MPa, and the cosolvent concentration ranges from 0. 0 to 5.5 mol% . The solubility increases with acetonitrile concentration and pressure, and it also increases with the apparent density of CO2 d1(moles of CO2 in per liter of fluid) at higher cosolvent concentrations. At lower d1, however, the solubility of the acid at lower acetonitrile concentrations is lower than that in pure CO2 provided that d1 is fixed, which is discussed qualitatively based on the clustering of the components in the system.     

The Assembly and Molecular Structure of a Novel One-dimensionalCyanide-bridged [Ni(pn)_2Ni(CN)_4]_n·nH_2 O Complex

IntroductionSincetheearlyworkofPedersen',CramZandLehn',molecularassemblyhasattractedmuchattentionfromscientistsofdifferentareas,rangingfromchemistrytosolid-statephysicsandbiology,becauseofthepotentialimpactonmaterialscience,catalysisandmetallo-biochemistry#.ThepreparationandstUdyofpolynuclear,cyanide-bridgedmetalcomplexeshaveattractedconsiderableinterestoverthepastdecades-I3.Cyanide-bridgedpolynuclearcomplexesaresuitablefortheconstructionofsuchdevicestoobtainmoleculescapableofestablishingspe…     

一类三次系统的细奇点

本文研究了具有一个高阶奇点的系统（１,２）,通过在实系统中引入奇点量的概念使焦点量和鞍点量得到统一,并且计算了系统（１．２）的各阶奇点量,证明了这样的系统存在珐多三阶细奇点,而且同时存在细奇点的最大个数是四。当系统是四个细奇点时,它们可能是四个一阶细奇点或四个三阶细奇点。     

二阶扩张状态观测器的误差分析

本文利用分片光滑的Ｌｙａｐｕｎｏｖ函数来进行扩张状态观测器的误差分析,指出了非线性扩张状态观测器有更好的估计精度能力,给出了为提高估计精度扩张状态观测器的参数所满足的条件．     

激波诱导气流与液幕、液柱相互作用的实验研究

利用激波管对激波诱导气流与液幕、液柱的相互作用进行了实验研究。通过比较发现,这种相互作用下的液体块变形破碎过程与以往对于液滴进行的研究结果很不相同。当激波与液幕相互作用时,阴影照片和直接照相都表明,液幕的变形破碎行为有很强的三维性,较之液滴的变形破坏机理更为复杂,并且在局部区域,初始时刻液幕破碎抛撒的速度相较激波诱导气流速度为快,本文应用一维变截面激波管理论对这一现象进行了理论分析。