石墨及其涂层材料性能的研究

本文在改制后的ＬＡＳ－２０００表面分析设备上对ＳＭＦ８００，Ｇ３石墨和（ＳｉＣ＋Ｃ）／Ｃ涂层石墨的真空出气性能和Ｄ＾＋束辐照化学增强腐蚀性能进行了分析研究。研究表明：ＨＬ－１Ｍ装置第一壁选择ＳＭＦ８００石墨及其处理工艺及合理，正确的。     

小型星模拟器中星图动态显示系统的设计

阐述了星图动态显示系统的工作原理和系统要求,讨论了ＴＦＴ－ＬＣＤ在星图动态显示系统中的应用方法,提出了ＴＦＴ－ＬＣＤ的电路实现方案,对星图动态主要软件的设计进行了分析和研究。     

γ射线辐照对类金刚石薄膜结构与特性的影响

用射频等离子体方法在玻璃基底上制备了类金刚石薄膜。分析了γ射线辐照类金刚石薄膜（以下简称ＤＬＣ薄膜）的结构与特性改变。采用Ｒａｍａｎ及红外光谱进行结构分析表明：随辐照剂量的增加，在膜中出现ＳＰ３Ｃ—Ｈ及 ＳＰ２Ｃ—Ｈ 键的断裂与减少，ＳＰ３Ｃ—Ｃ键的略微增加．当辐照剂量达 １０ ×１０４Ｇｙ时，ＳＰ３Ｃ—Ｈ键减少约５０％，与此同时，出现膜中氢的重新键合，并从中释出。γ射线辐照使ＤＬＣ薄膜的电阻率呈上升趋势，膜的类金刚石特征更加明显，结构得到改善。本文对γ射线对ＤＬＣ薄膜的辐照机制进行了简要的讨论。     

PF尼龙的辐射交联

研究了长碳链聚酰胺ＰＦ尼龙的辐射交联。ＰＦ尼龙Ｉ＃的起始胶化剂量Ｒｇ为０．３３－０．３５ＭＧｙ，ＰＦ尼龙Ⅱ＃的Ｒｇ为０。４３－０。４７ＭＧｙ。用ＩＲ，Ｒａｍａｎ和ＤＳＣ研究了辐照ＰＦ尼龙的化学结构和热学性质。结果表明，辐照交联ＰＦ尼龙分子链上有Ｃ＝Ｃ和Ｃ＝Ｎ键结构产生，其熔融热△Ｈｍ，结晶热△Ｈｃ，结晶温度Ｔｃ和熔融温度Ｔｍ随辐照剂量Ｒ的增加而降低。空气中的氧对ＰＦ尼龙的辐射交联有一定影响。     

TECHNICAL AND ECONOMIC ASPECTS OF TUNNEL BLASTING ACCURACY CONTROL

ＴＥＣＨＮＩＣＡＬＡＮＤＥＣＯＮＯＭＩＣＡＳＰＥＣＴＳＯＦＴＵＮＮＥＬＢＬＡＳＴＩＮＧＡＣＣＵＲＡＣＹＣＯＮＴＲＯＬ￥ＲｅｎａｔｏＭＡＮＣＩＮＩ（）；ｖａｎｎｔＢＡＤＩＮ０（）；ＮｉｃｏｌａＩＮＮＡＵＲＡＴ０（＊）；ＭａｕｒｏＦＯＲＮＡＲ０（＊），Ｍ...     

新型宽带接入技术及其应用前景

介绍了ＰＯＮ、ＸＤＳＬ、ＨＦＣ、ＬＭＤＳ４种新型的宽带接入技术，并就国内国际的具体发展情况分析了这些宽带接入技术在网络通信中的应用前景。     

抗CD20嵌合抗体Fab'片段在大肠杆菌中高效表达

利用ＰＣＲ方法从抗ＣＤ２０ＳｃＦｖ表达载体上扩增重链可变区、轻链可变区基因,然后将ＶＨ、ＶＬ基因重组到Ｆａｂ’表达载体中,构建成抗ＣＤ２０嵌合抗体Ｆａｂ’片段表达载体ｐＹＺＦｃｄ２０,用ｐＹＺＦｃｄ２０转化大肠杆菌１６Ｃ９,在１６Ｃ９菌中分泌表达可溶性抗ＣＤ２０Ｆａｂ’片段,经分离纯化获得具有ＣＤ２０抗原特异结合活性的Ｆａｂ’片段,竞争性竞争荧光抑制实验表明,抗ＣＤ２０Ｆａｂ’片段竞争性抑亲本属源     

KS57C0002 单片机在无绳电话机中应用

由于微处理器的使用，无绳电话机进入智能化时代。本文主要介绍应用三星电子公司ＫＳ５７Ｃ０００２四位单片机实现无绳电话机的ＬＣＤ显示、密码保存、频道转换、ＤＴＭＦ软件发生等功能。     

液晶弥散高分子材料的制备方法

液晶弥散高分子材料（ＰＤＬＣ）是一类在显示器件中具有广泛用途的新材料。使用ＰＬＤＬＣ材料的器件，其基板表面不需定向处理，灌注封装容易。这使器件的设计和生产工艺大大简化，降低了器件成本。ＰＤＬＣ材料的开发，使液晶应用进入了一个新领域。介绍了目前流行的ＰＤＬＣ制备方法。     

紫外线辐照对HDPE结晶结构及化学结构的影响

采用ＤＳＣ、ＷＡＸＤ、元素分析、ＦＴ－ＩＲ、ＥＳＣＡ、ＧＰＣ、交联度和密度测定，研究了紫外线辐照了ＨＤＰＥ的结晶结构及化学结构变化。结果表明，紫外线辐照后，ＨＤＰＥ的熔融温度降低、熔融热焓升高、结晶度增大、晶胞结构未发生变化；ＨＤＰＥ分子甸主了ＣＯＯＨ、Ｃ＝Ｏ、Ｃ－Ｏ、ＯＯＨ、ＯＨ等含氧官能团，分子量降低，分子量分布加宽，基本无交联发生。     

Improvement of radiation stability of semi-insulating gallium arsenide crystals by deposition of diamond-like carbon films

We studied the properties of optical elements for the IR spectral range based on semi-insulating gallium arsenide (SI-GaAs) and antireflecting diamond-like carbon films (DLCF). Particular attention has been paid to the effect of penetrating γ-radiation on transmission of the developed optical elements. A Co⁶⁰ source and step-by-step gaining of γ-irradiation dose were used for treatment of both an initial SI-GaAs crystal and DLCF/SI-GaAs structures. It was shown that DLCF deposition essentially increases degradation resistance of the SI-GaAs-based optical elements to γ-radiation. Particularly, the transmittance of the DLCF/SI-GaAs structure after γ-irradiation with a dose 9⋅10⁴ Gy even exceeds that of initial structures. The possible mechanism that explains the effect of γ-radiation on the SI-GaAs crystals and the DLCF/SI-GaAs structures at different irradiation doses was proposed. The effect of small doses is responsible for non-monotonic transmission changes in both SI-GaAs crystals and DLCF/SI-GaAs structures. At further increasing the γ-irradiation dose, the variation of properties of both DLCF and SI-GaAs crystal influences on the transmission of DLCF/SI-GaAs system. At high γ-irradiation dose 1.4⋅10⁵ Gy, passivation of radiation defects in the SI-GaAs bulk by hydrogen diffused from DLCF leads to increasing the degradation resistance of the SI-GaAs crystals coated with DLCF as compared with the crystals without DLCF.     

类金刚石膜的光学及场发射性能研究现状

类金刚石膜以其优良的性能广泛应用于机械、电子、光学和生物学等许多领域，主要介绍了DLCF的光学及场发射性能研究进展，并对研究现状进行了分析和展望。     

SiC及a-SiC：H薄膜的辐照及其进展

SiC是一种宽带隙半导体材料,在高温,高频在,大功率,光电子及抗辐射等方面具有巨大的应用潜力,介绍了国外对该材料及其薄膜进行辐照的一些结果,并指出开展SiC及其薄膜辐照效应研究的重要意义,预测了其发展方向和应用前景。     

Surface features of Zr-based and Ti-based metallic glasses by ion irradiation

Due to a lack of crystalline structures and grain boundaries, metallic glasses exhibit extremely high strength and superior resistance to corrosion. They are also supposed to be resistant against displacive irradiation due to their inherent disordered structure, thereby are potential candidates for applications in irradiation environments. In this work, the irradiation effects of Zr- and Ti- based bulk metallic glasses (BMGs) under heavy ions irradiation were investigated. The results showed that the Zr-based BMG is more resistant to the Cl ion irradiation with no structural transition and distinct damage subjected to high irradiation fluence. In contrast, the Ti-based BMG exhibits unique damage morphology with respect to the Zr-based BMG and other reported metallic glasses material. Two kinds of damage pits in micrometer scale form on the irradiated surface, and distinct viscous flow takes place. The formation mechanism of the unique irradiation damage feature is discussed.     

Effects of gamma irradiation for sterilization on aqueous dispersions of length sorted carbon nanotubes

There is currently great interest in the potential use of carbon nanotubes as delivery vessels for nanotherapeutics and other medical applications. However, no data are available on the effects of sterilization methods on the properties of nanotube dispersions, the form in which most medical applications will be processed. Here we show the effects of gamma irradiation from a ⁶⁰Co source on the dispersion and optical properties of single-wall carbon nanotubes in aqueous dispersion. Samples of different length-refined populations were sealed in ampoules and exposed to a dose of approximately 28 kGy, a level sufficient to ensure sterility of the dispersions. In contrast to literature results for solid-phase nanotube samples, the effects of gamma irradiation on the dispersion and optical properties of the nanotube samples were found to be minimal. Based on these results, gamma irradiation appears sufficiently non-destructive to be industrially useful for the sterilization of nanotube dispersions.     

Continuous laser irradiation under ambient conditions: A simple way for the space-selective growth of gold nanoparticles inside a silica monolith

Thanks to the potential and various applications of metal-dielectric nanocomposites, their syntheses constitute an interesting subject in material research. In this work, we demonstrate the achievement of gold nanocrystals growth through a visible and continuous laser irradiation. The in situ and direct space-selective generation of metallic nanoparticles is localized under the surface within transparent silica monoliths. For that purpose, the porous silica monoliths are prepared using a sol-gel route and post-doped with gold precursors before the irradiation. The presence of Au nanoparticles inside the irradiated areas was evidenced using absorption spectroscopy, X-ray diffraction analysis and transmission electron microscopy. The comparison between the results obtained after a laser irradiation and by a simple heat-treatment reveals that the local precipitation of gold nanoparticles by continuous photo-irradiation occurs following a photo-thermal activated mechanism.     

Organohalide Lead Perovskites: More Stable than Glass under Gamma‐Ray Radiation

Organohalide metal perovskites have emerged as promising semiconductor materials for use as space solar cells and radiation detectors. However, there is a lack of study of their stability under operational conditions. Here a stability study of perovskite solar cells under gamma‐rays and visible light simultaneously is reported. The perovskite active layers are shown to retain 96.8% of their initial power conversion efficiency under continuous irradiation of gamma‐rays and light for 1535 h, where gamma‐rays have an accumulated dose of 2.3 Mrad. In striking contrast, a glass substrate shows obvious loss of transmittance under the same irradiation conditions. The excellent stability of the perovskite solar cells benefits from the self‐healing behavior to recover its efficiency loss from the early degradation induced by gamma‐ray irradiation. Defect density characterization reveals that gamma‐ray irradiation does not induce electronic trap states. These observations demonstrate the prospects of perovskite materials in applications of radiation detectors and space solar cells.     

Proton and photon absorbed-dose conversion coefficients for embryo and foetus from top-down irradiation geometry

Absorbed-dose conversion coefficients are calculated for the embryo of 8 weeks and the foetus of 3, 6 or 9 months when the mother's body is exposed to protons and photons from top-down (TOP) direction. It provides data sets in addition to other standard irradiation geometries published previously. The TOP-irradiation geometry is considered here, because high-energy particles are often peaked from the TOP direction onboard aircrafts. The results show that absorbed-doses from high-energy particles could be underestimated significantly if isotropic (ISO) irradiation geometry is assumed. For protons of 100 GeV, absorbed-doses from TOP irradiation are approximately 2.3-2.9 times higher than the doses from ISO irradiation for different foetal ages. For 10 GeV photons, foetal doses from TOP irradiation are approximately 6.8-12 times higher than the doses from ISO irradiation. The coefficients from TOP-irradiation geometry are given in wide energy ranges, from 100 MeV to 100 GeV for protons and from 50 keV to 10 GeV for photons. They can, therefore, be used in various applications whenever exposure from the TOP-irradiation direction is concerned.     

Neutron irradiation of a broad spectrum of NbTi superconductors

The effects of neutron irradiation on critical currents in NbTi of widely differing metallurgical starting conditions were studied. The analysis of data prior to irradiation shows a predominance of cell pinning in Nb-42 wt% Ti and of precipitate pinning in Nb-49, 54 wt% Ti, respectively. In the course of neutron irradiation up to a fluence of 9 × 10²² m^?2 (E > 1 Me V)), the changes of i_c vary between +6 and ?25%. The results show a decreasing degradation of i_c with increasing Ti-concentration indicating significantly different effects of neutron irradiation on cell and precipitate pinning. Furthermore, we find that the deterioration of i_c is, in general smaller than the improvements of i_c which may be achieved by an optimized metallurgical treatment prior to irradiation. Hence, metallurgically optimized conductors are preferable for applications involving neutron irradiation.     

Electron beam irradiation for structuring of molecular assemblies

Nontraditional applications of electron beam irradiation for patterning of molecular assemblies are considered. The electron beam can have the following effects on molecular layers: destruction of molecular structure under e-beam irradiation with a successive formation of new molecular system when the irradiation is stopped; variation of the properties of the layer after e-beam irradiation; crosslinking of molecules in the layer under irradiation; modification of the templates for the successive film growth, providing different growing conditions in irradiated and nonirradiated areas; and activation of the solid support surface and molecular systems in the film resulting in the increased adhesion of the layer to the substrate in irradiated areas. All these effects were used for patterning of thin layers of different compounds. Five classes of molecular systems were considered, namely, films of simple surfactant molecules, layers of charge-transfer complexes, films of conducting polymers, aggregated nanoparticulate layers and films of nanoengineered polymeric capsules. Characteristic features of patterning processes in each particular case are discussed.