氧离子束辅助激光制备具有组构的YBCO薄膜

应用氧离子束辅助准分子脉冲激光沉积薄膜技术,先在ＮｉＣｒ合金（Ｈａｓｔｅｌｌｏｙ ｃ－２７５）基底上在室温下淀积具有平面织构的钇稳锆（ＹＳＺ） 缓冲层薄膜,再在 ＹＳＺ／ＮｉＣｒ基底上在 ７５０℃下制备具有平面织构和高临界电流密度的 ＹＢａ２Ｃｕ３Ｏ７－Ｘ（ＹＢＣＯ）薄膜、 ＹＳＺ和 ＹＢＣＯ薄膜都为 ｃ－轴取向和平面织构的, ＹＳＺ（２０２）和 ＹＢＣＯ（１０３）的 Ｘ射线扫描衍射峰的全宽半峰值分别为 １８＇和 １１＇．ＹＢＣＯ薄膜的临界温度和临界电流密度分别为 ９０Ｋ（Ｒ＝０）和 ７．９ｘ１０５Ａ／ｃｍ２（７７Ｋ,零磁场）．     

TECHNICAL AND ECONOMIC ASPECTS OF TUNNEL BLASTING ACCURACY CONTROL

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

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文摘（２）ｌ高能量废弃爆炸物的回收处理（英文）Ｃ９４２９３１５２ＴＯＲＭＡＳＣ（ＯｌｉｎＯｒｄｎａｎｃｅ，ＦＬ），ＲＩＳＥＲＢ（ＮａｔｉｏｎａｌＯｒｄｎａｎｃｅａｎｄＭｕｍ－ｂ。ｕｓＥｎ川ｒ。＂ｍｅｎ比ＩＴｅｓｔｃｅｎ忱ｒ，ＡＲ），ＴＯＲＭＡＡＥ（Ｅ...     

Na掺杂对MTG-YBCO临界电流密度特性的影响

本文研究了Ｎａ掺杂对ＭＴＧ－ＹＢＣＯ（ＹＢａ２－ｘＮａｘＣｕ３Ｏｙ＋４０ｍｏｌ％Ｙ２ＢａＣｕＯ５ｘ＝０．０、０．１、０．２）生长织构及其超导性能的影响。适量Ｎａ的掺入有利于ＭＴＧ－ＹＢＣＯ沿（ａｂ）面的生长,改善晶体生长的宏观形貌。同时,掺Ｎａ后ＭＴＧ－ＹＢＣＯ试样的Ｔｃ,ｏｎ变化不大,但Ｔｃ,ｏｆｆ随掺杂量ｘ的增加而降低,即超导转变宽度△Ｔ增大。适量Ｎａ掺杂改善了ＭＴＧ－ＹＢＣＯ的临界电流密度特     

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文摘１３，５－二硝基苯甲酸与３，５－二硝基苯甲酸铝盐的分解热研究（英文）Ｃ９２３３１９０３ＲＥＤＤＹＧＯ，ＲＡＶＩＫＵＭＡＲＫＳ（ＩＤＬＣｈｅｍｉｃａｌｓＬｔｄ，Ｂａｎｇａｌｏｒｅ，ＩＮＤ）：Ｅ０３５０ＣＴｈｅｒｍｏｃｈｉｍＡｃｔａ（ＮＬＤ）１９８（...     

IBAD薄膜与基体界面的显微结构

采用中能离子束辅助沉积（ＩＢＡＤ）技术，在单晶Ａｌ２Ｏ３（０００１）基片上沉积Ｍｏ膜，在ＧＡＡｓ（００１）基片上合成Ｆｅ１６Ｎ２薄膜，用ＨＲＥＭ等研究了Ｍｏｅａｊｄ－Ａｌ２Ｏ３（０００１），Ｆｅ１６ｎ２膜－ＧａＡｓ（００１）界面的显微结构，结果表明：Ｍｏ膜的晶粒呈细小柱状或纤维状，晶粒平均尺寸约８ｎｍ，Ｆｅ１６Ｎ２薄膜为等轴晶，晶粒平均尺寸约为１０ｎｍ，在Ｍｏ膜－Ａｌ２Ｏ３（０００１）界面及Ｆｅ１     

国产金属有机化合物TMGa,TMAl,TMIn和TMSb的MOVPE鉴定

利用我们研制的常压ＭＯＶＰＥ设备对国产ＴＭＧａ、ＴＭＡｌ、ＴＭＩｎ和ＴＭＳｂ进行了鉴定，为此分别生长了ＧａＡｓ、ＡｌＧａＡｓ、ＩｎＰ、ＧａＳｂ外延层和ＧａＡｓ／ＡｌＡｓ、ＧａＳｂ／ＩｎＧａＳｂ超晶格和ＧａＡｓ／ＡｌＧａＡｓ量子阱结构。表征材料纯度的７７Ｋ载流予迁移率分别达到ＧａＡｓ：μ＿ｎ＝５６６００ｃｍ￣２／Ｖ·ｓ，Ａｌ＿（０．２５）Ｇａ＿（０．７５）Ａｓ：μ＿ｎ＝５１６０ｃｍ￣２／Ｖ·ｓ，ＩｎＰ：μ＿ｎ＝６５３００ｃｍ￣２／Ｖ·ｓ，ＧａＳｂ：μ＿ｐ＝５０７６ｃｍ￣２／Ｖ·ｓ。由１０个周期的ＧａＡｓ／ＡｌＡｓ超晶格结构组成的可见光区布拉格反射器已观测到很好的反射光谱和双晶Ｘ射线回摆曲线上高达±２０级的卫星峰。ＧａＡｓ／Ａｌ＿（０．３５）Ｇａ＿（０．６５）Ａｓ量子阱最小阱宽为１０，在ｌｉＫ下由量子尺寸效应导致的光致发光峰能量移动为３９０ｍｅＶ，其线宽为１２ｍｅＶ。这些结果表明上述金属有机化合物已达到较高质量。     

无Co混合导电型陶瓷透氧膜的制备和性质研究

首次合成了Ｓｒ１０－ｎ／２ＢｉｎＦｅ２０Ｏｍ（ｎ＝２，４，６，８，１０等）系列氧化物透氧膜，它们具有较高的透氧能力，其中，样品ｎ＝１０在１１００Ｋ时的透氧率为０．９０ｍｌ（ＳＴＤ）／（ｃｍ２·ｍｉｎ），比Ｓｒ１－ｘＢｉｘＦｅＯ３高约两倍．Ｓｒ１－ｘＢｉｘＦｅＯ３（ｘ＝０．１，０．３，０．５）系列的透氧率随Ｂｉ含量增加而增大．通过两个系列氧化物的ＸＲＤ和化学组成的对比，发现Ｂｉ离子含量和晶格空位浓度对透氧能力大小起决定性作用．     

YCOB晶体生长与激光倍频性能研究

坩埚下降法沿＜０１０＞和＜００１＞方向生长了直径达到２５ｍｍ的完整透明的Ｃａ４ＹＯ（ＢＯ３）３ （ＹＣＯＢ）晶体．化学腐蚀结果表明，所生长晶体无孪晶或亚晶界等缺陷，晶体尾部的位错密度 不超过１８００／ｃｍ２测量了ＹＣＯＢ的透射光谱，其截止波长为２００ｎｍ进行了ＹＣＯＢ晶体对 Ｎｄ：ＹＡＧ激光的二次倍频实验．通过与ＫＤＰ晶体对比，计算出ＹＣＯＢ晶体的有效非线性系数 在Ⅰ型相位匹配方向（θ，φ）＝（６６．３°，１４３．５°）和（６５．９°，３６．５°）上分别为１．４５ｐｍ／Ｖ和０．９１ｐｍ／Ｖ； 大于ＫＤＰ和 ＬＢＯ晶体．在脉冲宽度１０ｎｓ的 Ｎｄ：ＹＡＧ激光单脉冲辐射下ＹＣＯＢ晶体出现体 损伤的激光损伤阈值不低于８５ＧＷ／ｃｍ２．     

Y—PSZ对Al2O3纳米粉烧结特性及性能的影响

在Ａｌ２Ｏ３纳米粉中加入１００－４００ｍｇ．ｇ＾－１的０．０２５ｍｏｌＹ２Ｏ２（Ｙ－ＰＳＺ），探讨了加入量对Ａｌ２Ｏ３纳米粉的烧结特性和烧成陶瓷力学性能的影响，结果表明，Ｙ－ＰＳＺ可促进烧结致密化，降低烧结温度，并且有效地抑制烧结时Ａｌ２Ｏ３晶粒的长大，提高烧成陶瓷的性能。     

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.     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

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.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.