红条毛肤石鳖主要横向牙齿内纳米磁性矿物质的扫描电镜研究

利用扫描电子显微镜(SEM),观察并分析了红条毛肤石鳖成熟的主要横向牙齿内天然存在的磁性纳米矿物质的形态、成分以及在牙齿内的大致分布,并和以往磁性研究中牙齿以及牙齿内磁性纳米矿物质所表现出来的强单轴各向异性相联系进行了讨论 关键词： 纳米磁性材料 扫描电镜研究     

Bridged amine-functionalized mesoporous organosilica materials from 1,2-bis(triethoxysilyl)ethane and bis[(3-trimethoxysilyl)propyl]amine

Amine-functionalized, organic/inorganic hybrid mesostructured organosilica (BAFMO) materials have been synthesized and characterized from two bridged silsesquioxane precursors, 1,2-bis(triethoxysilyl)ethane (BTESE) and bis[(3-trimethoxysilyl)propyl]amine (BTMSPA). Mole ratios of BTESE ranged from 0.05, 0.10, 0.125, to 0.175. The synthetic pathway involves employing cetyltrimethylammonium bromide as a template under basic conditions at room temperature. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies revealed that the resultant BAFMO materials possess mesocopically ordered, hexagonal symmetries and well-defined morphologies. However, the order was decreased as the amount of BTMSPA increased, in terms of the d₁₀₀ spacings and the unit cell parameters on XRD as well as the TEM images. N₂ gas sorption experiments showed a gradual decrease in both the surface area, from 1075 to 688 m²/g, and the pore volume, from 2.08 to 0.55 cm³/g, on increasing the amount of BTMSPA. The organic functionalization was successfully determined by Fourier-transform infrared and ¹³C CP MAS NMR spectroscopy. X-ray photoelectron spectroscopy and elemental analysis results also confirmed the presence of Si-C bond as well as amine functionalities in the solvent-extracted mesoporous organosilica materials.     

赤链华游蛇消化道粘膜上皮结构的扫描电镜观察

采用扫描电镜技术，观察了赤链华游蛇消化道粘膜上皮表面细微结构的特征。结果表明，其食道前段粘膜上皮由纤毛细胞、柱状细胞组成，后段为假复层上皮细胞组成；胃粘膜上皮为单层柱状细胞，细胞表面无微绒毛；肠粘膜上皮细胞表面有微绒毛；同时，还讨论了这些结构与机能的关系。     

光放大方法及其应用

介绍了光放大的实验原理，阐述了光放大原理在万有引力实验和扫描探针显微镜中的应用。     

FLAIR – a facility for low-energy antiproton and ion research

In order to exploit the unique possibilities that will become available at the Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt, a collaboration of about 50 institutes from 15 countries was formed to efficiently enable an innovative research program towards low-energy antimatter-physics. In the Facility for Low-energy Antiproton and Ion Research (FLAIR) antiprotons and heavy (radioactive) ions are slowed down from 30 MeV to energies as low as 20 keV by a magnetic low-energy storage ring (LSR) and an electrostatic ultra-low energy storage ring (USR) or are even brought to rest by a universal trap facility (HITRAP). In this paper, the facility and the research program covered are briefly described with some emphasis on the accelerator chain and the expected particle numbers. for the FLAIR collaboration     

Micro-experimental study for the stress effects on the interphase of composite materials

Digital speckle micro-metrology system, which is a combination of a long-focus microscope and a digital image-measuring device, is developed for studying the micro-mechanics behavior of the interphase of bimaterials. The natural texture of a specimen's surface is thought as a carrier of deformation's information and is analyzed to obtain the displacement field in each step, strain field and their real-time variation of the interphase. The resolution of the micro-metrology system is 10 nm for in-plane displacements. In this paper, the micro-metrology system is employed to investigate the micro-mechanics behavior of the interphase under thermal impulsing. The experimental results show that the interphase is the main factor affecting the mechanical characteristic of the whole composite structure.     

双壁纳米碳管的制备及其结构研究

用含有铁族金属硫化物的复合石墨棒作阳极，在氢气氛围下实施电弧放电，制备出了双壁纳米碳管.经透射电子显微镜观察与分析，发现在蒸发室内壁及阴极周围的附着物中，都含有双壁纳米碳管. 关键词： 双壁纳米碳管 透射电子显微镜     

Improvement of confocal microscope performance by shaped annular beam and heterodyne confocal techniques

In order to further improve the performance of a confocal microscope (CM) used for measurement of surface profiles and 3D microstructures, a shaped annular beam heterodyne confocal measurement method based on annular pupil filter technique and reflection confocal microscopy, is proposed to expand the measurement range and to improve the defocused property of CM. The approach proposed uses a confocal dual-receiving light path arrangement and a heterodyne subtraction of two signals received from detectors with axial offset to enable CM to be used for bipolar absolute measurement and to improve the defocused property of CM, and it uses the annular pupil filter technique to produce a binary optical shaped annular beam, which expands the measurement range by expanding the full-width at half-maximum of intensity curve received from two detectors in a heterodyne confocal microscopy system. Theoretical analyses and experimental results indicate that a shaped annular beam heterodyne microscope has a measurement range expanded from 4 to 14 μm, achieved an axial resolution of 2 nm and improved the defocused property, when ε=0.5 and NA=0.65. It can be therefore concluded that the shaped annular beam heterodyne confocal measuring method proposed is a new approach to ultraprecision measurement of surface profiles and 3D microstructures.     

Encapsulation of dicinnamalacetone in β-cyclodextrin: A physicochemical evaluation and molecular modeling approach on 1:2 inclusion complex

The aim of this research is to prepare and characterize the inclusion complex between Dicinnamalacetone (DCA) and β-CD. The inclusion complex of Dicinnamalacetone [DCA] and Beta-cyclodextrin [β-CD] was characterized both in solution and solid state by UV-visible spectroscopy, Fluorescence spectroscopy, Nano second time resolved fluorescence study, Fourier Transform Infra-red spectroscopy (FT-IR), Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM), Powder X-ray diffractometry (XRD), Atomic Force Microscopy (AFM) and molecular modeling test. The 1:2 soichiometry of inclusion complex and binding constant values were determined by Benesi-Hildebrand plot and confirmed by Job's continuous variation method. FT-IR study indicated that the aromatic rings of the Dicinnamalacetone molecule were included in the β-CD cavities. The nano second time resolved fluorescence study revealed that DCA exhibits single exponential decay in aqueous medium and bi-exponential decay in β-CD medium indicating the formation of inclusion complex. From the DSC study it is observed that the thermal stability of the inclusion complex was significantly enhanced when compared with the pure compound due to strong interaction between DCA and β-CD. Furthermore, implementation of molecular modeling test confirmed that the complexation could reduce the energy of the system. The experimental studies revealed that the most predominant structure of 1:2 inclusion complex is the one in which the two aromatic ends of DCA were inserted into the cavities of two β-CD molecules.