复杂环境下150m砼烟囱两段单向控制爆破技术

介绍了在周围环境不能满足烟囱整体定向倾倒的复杂条件下,采用两段单向控制爆破技术对150m高钢筋混凝土烟囱实施拆除。通过开设定向窗、减荷槽,采用倒梯形爆破切口,选择合理的爆破参数及精细化施工等确保了烟囱倒塌方向准确,有效地控制了烟囱后坐。通过铺设缓冲垫层、搭设防护屏障、开挖减振沟等措施有效控制了爆破触地振动及飞石等危害,达到了设计效果,可为类似爆破工程提供参考。     

砖砌烟囱定向爆破拆除实践

介绍了一座 62m砖砌烟囱定向爆破拆除的实例。为保证烟囱准确定向倾倒 ,采取了一些技术措施 ,这些措施包括采用倒梯形切口减少烟囱爆破时的后坐 ;开设定向窗控制切口范围和形状 ;采用多向闭合起爆网路提高起爆网路可靠性以及内衬预处理等。通过采用微差爆破、开挖减震沟及在地面铺设缓冲材料等 ,降低爆破震动及烟囱触地震动强度。文中论述了爆破方案设计、爆破参数确定以及飞石防护等安全措施 ,并简述了爆破效果。     

15Om高钢筋混凝土烟囱控制爆破拆除

采用两段两次控制爆破拆除了150m高钢筋混凝土烟囱.通过选用复式梯形爆破缺口和合理的爆破参数,并采用开挖减振沟及铺设缓冲垫层等安全防护措施,使烟囱爆破达到了定向准确、安全、破碎好的效果,可为类似爆破工程提供参考.     

62 m高烟囱定向爆破拆除

复杂环境条件下高耸建筑物的定向爆破拆除,具有工期短、成本低等特点,通过一座62 m高烟囱定向爆破拆除的实践,叙述了定向控制爆破拆除砖混烟囱的设计要领及力学原理,施工方法,防护措施和爆破效果.     

海口华能电厂150m高钢筋混凝土烟囱控制爆破拆除

介绍了复杂环境下150 m高钢筋混凝土烟囱的爆破拆除.采用复式梯形切口,水钻切边、试爆开窗、预留支撑体,爆破时只炸支撑体而使烟囱定向倾倒.通过精心设计和施工取得了定向准确、倾倒落地安全、爆破危害控制好的爆破效果.     

铜陵110m高烟囱和120m高烟囱爆破拆除

介绍了采用定向控制爆破技术拆除铜陵有色一冶厂110m高环保烟囱和120 m熔炼烟囱的成功实例.给出爆破方案的设计、爆破参数的选取、方向控制预处理情况、防护措施及爆破效果,为今后此类烟囱的爆破拆除提供了参考依据.     

谏壁电厂三座100m高钢筋混凝土烟囱爆破拆除

介绍了三座100m高结构相同的钢筋混凝土烟囱一次爆破全部成功拆除。采用单切口定向倒塌方式,机械预处理开窗、预留支撑体,爆破时只炸切口范围内的支撑体而使烟囱定向倾倒。通过精心设计和施工获得了定向准确、倾倒落地安全、振动及飞石等危害控制良好的爆破效果。     

电解铝厂120m高烟囱及旧厂房拆除爆破

介绍了电解铝厂120m高钢筋混凝土烟囱及旧厂房定向倒塌爆破拆除的情况。针对烟囱高度大、环境复杂及旧厂房大跨度的特点,对爆破方案进行了精心设计;经过计算选取合理的爆破切口及定向窗的范围;采用延时控制爆破技术,同时对烟囱及旧厂房进行爆破拆除。通过安全校核,确保了附近厂房的安全。     

90 m高钢筋混凝土烟囱爆破拆除

介绍了90 m高钢筋混凝土烟囱定向控制爆破拆除的成功经验.着重介绍了预处理措施、爆破切口形状与尺寸、爆破参数、起爆网路、安全技术措施及爆破效果等,并提出了采用取芯机开两侧定向窗的方法.     

电解铝厂120m高烟囱及旧厂房拆除爆破

介绍了电解铝厂120m高钢筋混凝土烟囱及旧厂房定向倒塌爆破拆除的情况。针对烟囱高度大、环境复杂及旧厂房大跨度的特点,对爆破方案进行了精心设计;经过计算选取合理的爆破切口及定向窗的范围;采用延时控制爆破技术,同时对烟囱及旧厂房进行爆破拆除。通过安全校核,确保了附近厂房的安全。     

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.……     

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.     

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.