基于TFCALC软件的薄膜偏光分束镜的设计

根据Macnielle薄膜偏光分束镜的设计原理,利用膜系设计软件对偏光分束镜进行优化设计.总结了偏光镜设计时参考波长、入射角以及膜层数随波长的变化规律,给出了LaK₂基底,ZrO₂和SiO₂为高低膜料的薄膜偏光分束镜优化设计方案,为薄膜偏光分束镜的设计和镀膜工艺提供了参考依据.     

Fatigue crack propagation mechanisms in poly(methyl methacrylate) by in situ observation with a scanning laser microscope

Crack propagation tests were performed on an amorphous polymer, poly(methyl methacrylate), to investigate fatigue crack propagation mechanisms. A scanning laser microscope with a newly developed tensile testing machine was used to observe in situ crack propagation in compact‐type specimens. A crack usually propagated within the craze located at the crack tip under both static and cyclic loading conditions. When a crack stably propagated into the craze under static loading conditions, bright bands composed of the broken craze were observed at the edges along the crack wakes. However, there were successive ridges and valleys in place of bright bands along the crack wakes under cyclic loading conditions. When stable fatigue cracks were propagated at the loading half‐cycle in each cycle, new craze fragments appeared that were similar to the bright bands under static loading. However, the thickness of these fragments decreased in the following loading cycle, and a new valley was formed. This suggested that the valleys were formed by the contact between the fracture surfaces near the crack tip during unloading. Fatigue crack propagation is thought to be due to fibrils weakened by crack closure between fracture surfaces. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 3103–3113, 2001     

液相烧结对Nd-Fe-B粉末压坯及磁体取向度的影响

XBD，SEM及MFM观察表明，Nd-Fe-B粉末压坯在液相烧结过程中同时存在两种影响主相晶粒取向度的机制：烧结过程中大颗粒吞并吸附在其表面的取向不良的小晶粒并择优长大，使磁体的取向度提高；在液相烧结过程中，被液相所包围的主相晶粒的自由转动，造成磁体的取向度降低。对于取向度较低的DP生坯，烧结中影响Nd-Fe-B磁体取向度的前一种机制是主导的；而对于取向度较高的振动RIP生坯，烧结过程中后一种机制起主导作用。     

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