堆石混凝土技术在水库大坝施工中的应用

本文介绍了堆石混凝土在洒谷水库大坝工程中的施工，对该新型混凝土的施工工艺、性能及综合效益评估等进行探讨，指出堆石混凝土是一种新型的节约投资、环保节能的施工工艺，具有广阔的应用前景。     

无粘结预应力混凝土结构施工技术

本文从施工角度阐述了无粘结预应力混凝土结构的施工质量控制及施工工艺,介绍了无粘结预应力混凝土结构的施工工艺及需重点注意的问题,从钢筋工程、混凝土工程和模板工程三方面介绍了无粘结预应力的施工技术,结合工程实例归纳了该技术的应用特点。     

泡沫混凝土的组成、性能与应用研究

本文通过介绍泡沫混凝土的组成及其原材料的选择,论述泡沫混凝土的性能特点,指出国内泡沫混凝土生产应用中存在的一些问题,同时讨论泡沫混凝土的生产施工工艺及应用前景。     

关于预应力混凝土箱梁结构施工工艺的探讨

本文从支架搭设、模板工程、混凝土工程等方面,对预应力混凝土箱梁结构的施工工艺进行了详细的介绍,并结合本人实际经验,对各工序的施工工艺及质量控制提出了一些意见与建议。     

混凝土施工中模板结构体系的控制探讨

混凝土结构最基本的施工即是模板工程施工。原有的施工经验已很难保证施工质量和施工安全,对于支撑架的设计和施工提出了更高的要求。论文首先分析了混凝土施工中模板结构体系中的安全管理技术,在分析现浇混凝土模板施工工艺的基础上,提出了对该体系在建筑中的施工质量控制。     

浅谈滑模混凝土配合比设计

滑模混凝土施工是一种先进的施工工艺,它以模板配置少,施工速度快,工程质量好等特点在建筑行业得到越来越广泛的应用。故滑模混凝土配合比的设计也显得尤为重要。本文通过介绍广西南宁电厂2×660MW工程烟囱滑模混凝土配合比的设计,从原材料的选用、基准配合比的确定及混凝土试配等方面阐述了滑模混凝土配合比的设计过程,并总结出了滑模混凝土设计的经验。     

滩坑电站大坝防浪墙施工

滩坑电站为国家重点工程，混凝土面板堆石坝坝高162米，属200米级高坝。本文简要介绍了自制大型钢模板在滩坑水库大坝防浪墙混凝土施工中的应用，在施工技术上达到规范要求，质量上得到保证，是一种比较理想的施工工艺，供其它同类型工程参考     

简议水库混凝土工程防渗施工工艺

水库混凝土防渗面板是大坝防渗的一种有效处理方法，特别是对于大面积坝面渗水的治理效果更加明显。该方法施工关键是模板的架立，由于模板主要靠坝面锚筋的拉结和坝面脚手架的支撑，使得模板拉结受力是否均匀直接影响模板的稳定性直至浇筑混凝土的成败。本文重点对水库混凝土工程面板防渗施工工艺及工程贯基评价作了分析。以供类似工程参考借鉴。     

柔模泵注混凝土支护结构的施工工艺探讨

模泵注混凝土支护过程是将预先制作好的纤维柔性模板通过短锚杆和钢筋网等固定在巷道周边，用混凝土泵将混凝土拌和物泵注入到柔性模板中。本文采用理论与实例分析，提出了柔模泵注混凝土的施工工艺与施工效果。     

浅谈铁路桥梁高墩施工工艺

高墩结构形式在新建铁路桥工程中运用的较为普遍，本文从钢筋工程、模板工程和混凝土工程等角度介绍了高墩施工中常用的滑动模板和爬升模板两种施工工艺。     

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.