全氟羧酸离子交换膜内化铅超微粒的光学非线性研究

在全氟羧酸阳离子交换膜中制备出不同颗粒尺寸的ＰｂＳ超微粒，并由吸收光谱及电镜测量结果获得证实。用习秒激光脉冲对ＰｂＳ超微粒复合膜进行了分辨光克尔效应测定，发现ＰｂＳ超微粒具有三阶光学非线性，三阶光学非线性极化率Ｘ＾（３）约为１０＾－１２ｅｓｕ，光克尔效应时间小于１６５ｆｓ，并且发现ＰｂＳ超微粒的光学非线性随着超微粒颗粒尺寸的减小而增大，显示出量子限域效应对于超微粒子光学非线性的贡献。     

全氟羧酸离子交换膜内硫化铅超微粒的光学非线性研究

在全氟羧酸阳离子交换膜中制备出不同颗粒尺寸的ＰｂＳ超微粒，并由吸收光谱及电镜测量结果获得证实。用飞秒激光脉冲对ＰｂＳ超微粒复合膜进行了时间分辨光克尔效应测定，发现ＰｂＳ超微粒具有三阶光学非线性，三阶光学非线性极化率Ｘ（３）约为１０（－１２）ｅｓｕ，光克尔效应响应时间小于１６５ｆｓ，并且发现ＰｂＳ超微粒的光学非线性随着超微粒颗粒尺寸的减小而增大，显示出量子限域效应对于超微粒子光学非线性的贡献。     

ZnSe基量子阱的低压MOCVD生长及性能表征

用低压－金属有机化学气相沉积（ＬＰＭＯＣＶＤ）方法生长了ＺｎＣｄＳｅＺｎＳｅ和ＺｎＴｅＳｅＺｎＳｅ多量子阱（ＭＱＷｓ）。在生长室压力３８ｔｏｒ（５×１０３Ｐａ），衬底面积１９×２０ｍｍ２的ＧａＡｓ衬底上，生长１００周期的ＺｎＣｄＳｅＺｎＳｅＭＱＷｓ，经扫描电镜测量，生长不均匀性仅小于１０％。随生长压强增大，生长不均匀性也增大。在相同条件下生长１０周期的ＺｎＣｄＳｅＺｎＳｅ和ＺｎＴｅＳｅＺｎＳｅＭＱＷＳ，在Ｘ射线衍射谱上分别可观测到０，１级和０，１，２级卫星峰，随生长周期增加，其特性越明显。在生长５０周期的ＺｎＴｅＳｅＺｎＳｅＭＱＷＳｓ中可观测到０，１，２，３级卫星峰。在７７Ｋ，脉冲Ｎ２激光器激发的ＺｎＴｅＳＥＺｎＳｅＭＱＷｓ中观测到了起因于激子的受激发射。     

CdS在多层薄膜电致发光器件中的新应用

将ＣｄＳ蒸镀于电致发光器件中，测量这些器件的电学和光学特性，发现ＣｄＳ层可以提供较多的电子，但是，样品ＩＴＯ／ＳｉＯ／ＳｉＯ２／ＺｎＳＸ／ＣｄＳ／ＳｉＯ２／ＳｉＯ／Ａｌ（Ｘ＝Ｍｎ＾２＋，Ｓｍ＾３＋的亮度明显低于不仿ＣｄＳ的样品，说明这些电子在向Ｚｎｓ层输运的过程中能量有所降低，在样品ＩＴＯ／ＳｉＯ／ＳｉＯ２／ＺｎＳＸ／ＳｉＯ２／ＣｄＳ／Ａｌ中，ＣｄＳ产生的电子经过ＳｉＯ加速而获得了较高的能量，提高     

量子点量子阱ZnS/HgS/ZnS/CdS的制备与光学特性

运用湿化学与表面化学方法制备了ＺｎＳ／ＨｇＳ／ＺｎＳ／Ｃｄｓ量子点量子阱（ＱＤＱＷ）结构,以吸收光谱、光致发光及激光谱表征该结构,并研究了外层ＣｄＳ对材料发光特性的影响,首次观测到ＣｄＳ对中间ＨｇＳ阱层发光的增强作用,并归因子隧道效应的存在。     

国外文摘

国外文摘责任编辑詹小玲９６ｉｆ００１Ｍ性Ｚｎ－Ｎｉｔａ层和酸性Ｚｎ－Ｎｉｔ层作为代Ｃｄ４层的对比——ＢａｔｅｓＪＡ．ＰｌａｔｉｎｇａｎｄＳｕｒｆａｃｅＦｉｎｉｓｈｉｎｇ，１９９４，ｓｌ（４）：３６（英文）提供了从碱性溶液和酸性溶液沉积的Ｚｎ－Ｎｉ镀层...     

ZrO2及ZrO2:CdS薄膜的制备和表征

利用ｓｏｌ－ｇｅｌ方法合成了ＺｒＯ２薄膜,并通过在ＺｒＯ２薄膜中复合ＣｄＳ纳米粒子成功地制备了ＺｒＯ２：ＣｄＳ制得的ＺｒＯ２薄膜透明并具有较好的光透射性,而ＺｒＯ２的含量及膜厚是影响其光透射性的主要因素,分散在ＺｒＯ２：ＣｄＳ薄膜中的ＣｄＳ纳米粒子为六方相结构,并具有较好的分散性,其平均尺寸为４～６ｎｍ。实验结果表明,ＺｒＯ２颗粒的晶化会对薄膜的光学豚表面形貌产生影响,但ＣｄＳ的形成可以抑制薄膜表     

PTCR型（Sr，Pb）TiO_3陶瓷

ＰＴＣＲ型（Ｓｒ，Ｐｂ）ＴｉＯ_３陶瓷王德君，桂治轮，李龙土（清华大学，北京，１０００８４）（Ｓｒ，Ｐｂ）ＴｉＯ_３ＰＴＣＲＣｅｒａｍｉｃｓ￥ＷａｎｇＤｅｊｕｎ；ＧｕｉＺｈｉｌｕｎ；ＬｉＬｏｎｇｔｕ（ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ...     

低电阻率的(Sr,Pb)TiO_3基PTCR陶瓷

低电阻率的（Ｓｒ，Ｐｂ）ＴｉＯ３基ＰＴＣＲ陶瓷（Ｓｒ，Ｐｂ）ＴｉＯ３ＰＴＣＲＣｅｒａｍｉｃｓｗｉｔｈＬｏｗＲｅｓｉｓｔｉｖｉｔｙ王德君郭淳桂治轮李龙土（清华大学，北京，１０００８４）ＷａｎｇＤｅｊｕｎＧｕｏＹｕｃｈｕｎＧｕｉＺｈｉｌｕｎＬｉＬｏｎ...     

TiO2／SnO2超微粒及其复合LB膜的紫外—可见光吸收光谱的研究

用胶体化学方法制备ＴｉＯ２／ＳｎＯ２超微粒,ＴｉＯ２／ＳｎＯ２超微粒及其复合ＬＢ膜的紫外－可见光吸收光谱研究表明：ＴｉＯ２／ＳｎＯ２超微粒具有量子尺寸效应使吸收光谱发生“蓝移”;ＴｉＯ２／ＳｎＯ２超微粒／硬脂酸复合ＬＢ膜具有良好的抗紫外性能和光学透过性能。     

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.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

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.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.