光子图象统计检验的计算机模拟

分析了超高灵敏度光电成象系统和光子图象的特点，提出了用斯米诺夫检验来判断图象中有无信号，并用计算机模拟生成光子图象进行检验，得到了相关的三个因素对检验结论影响的量化关系。计算机模拟方法以及模拟过程得到的结论对于研究极弱光强条件下的图象信号探测有一定的指导意义。     

0在动态测量中面阵CCD受控变速读出方法研究

在成象跟踪系统中，光电探测的帧频对于系统的性能有着直接的影响。本文根据ＣＣＤ输出图象信号的电学特征，提出了变速出的工作原理和技术途径，完成了有关电路的设计。通过实验证明了变速出方法是提高面阵ＣＣＤ帧频的一种有效途径。     

增强型荧光显微镜的量化处理及测试

根据目前生物学及医学发展的需要，研制了一种在普通倒置生物显微镜下探测极微弱细胞荧光图象的高增益荧光显微镜。系统采用计算机采集荧光图象，由量化标定曲线对荧光图象中的每一点根据其灰度值给出定量数据，解决了以往显微镜只能定性观察不能定量分析的困难。     

在动态测量中面阵CCD受控变速读出方法研究

在成象跟踪系统中，光电探测的帧频对于系统的性能有着直接的影响。本文根据ＣＣＤ输出图象信号的电学特征，提出了变速读出的工作原理和技术途径，完成了有关电路的设计。通过实验证明了变速读出方法是提高面阵ＣＣＤ帧频的一种有效途径。     

计算机自动处理摄影图象的一种图象自动输入装置

简要介绍了用计算机自动处理胶片摄影图象的自动输入装置，并详细介绍一种线阵ＣＣＤ器件和步进电机组合用于胶片摄影图象自动输入装置的结构及精度，以及此种输入装置在自动胶片判读仪系统中的应用。其输入速度达１０帧／秒，胶片输片精度达０．０１５ｍｍ（ＴＭＳ）。     

CsI／Ni／LiF半透明真空紫外光阴极“日盲”效应的验证

ＣｓＩ／Ｎｉ／ＬｉＦ半透明真空紫外光阴极，ＣｓＩ的长波阈值为２００ｎｍ，即有很好的“日盲”效应。通过对照测试，得到验证。用氢看空紫外辐射源作检测光源，在专用的真空紫外光电发射特性测试系统中，测得ＣｓＩ／Ｎｉ／ＬｉＦ半透明真空紫外光阴极在１０５－１６５ｎｍ波长范围内平无题子产额为０．１６－０．２１电子／入射光子，而在２００－３６５ｎｍ紫外辐射下，其量子产额俟为１０＾－６－－１０＾－５电子／入射光子。     

CCD测量固体的线胀系统

本文介绍用ＣＣＤ图象传感器、光杠杆和微机组成自动化高准确度测试系统测量固体的线胀系统。     

受限于CCD光子噪声的探测能力分析

本文在分析了现有的研究成果的基础上，从光电子学的概念出发，根据ＣＣＤ噪声与输入信号相关的特性，提出了信噪比相关的信号检测概率，建立了ＣＣＤ光电系统对发光目标的极限探测能力公式。     

CCD测量固体的线胀系数

本文介绍用ＣＣＤ图象传感器、光杠杆和微机组成自动化高准确度测试系统测量固体的线胀系数。     

中国科大基于智能相变晶格裁剪策略发明高效上转换发光材料取得进展

<正>对于众多能量转换材料来说,其量子效率往往都受限于一些带来能量损耗的不良过程。例如,上转换发光效应可以吸收两个或多个低能量光子而发射出较高能量光子,从而可为生物靶向成像、检测及治疗、激光器、太阳能电池、光催化等很多领域实现光频率转换。该频率转换效应依赖于从荧光上转换材料的吸光中心到发光中心的传能过程,而在传能过程     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.