我国九种矿产资源严重短缺

从近年的情况看,由于经济的快速发展,我国已经成为世界上最主要的矿产和金属的消费国之一。有人认为,到2020年我国铁矿石的消费将占到世界的35．7l％,而消费比例超过20％的矿产由高到低有：煤、锡、锌、铅、氧化铝、铝、铅、铜等。近年来,中国矿产品产量的迅速提高并不能满足国内高涨的需求。根据中国矿业联合会的研究,到2020年中国所需的45种主要矿产可以基本划分为：可以保证、基本保证、短缺、严重短缺四类;可以保证的矿产共24种：煤、天然气、钨、钼、银、稀土、菱镁矿、萤石、耐火黏土、磷、重晶石、水泥灰岩、玻璃硅质原料、石膏、高岭土、石材、硅藻土、钠盐、芒硝、膨润土、石墨、石棉、滑石、硅灰石。基本保证的矿产两种：钛、硫。     

山西省水系沉积物含量特征及铜元素地球化学分布特征

依据山西省90年代完成的1:20万区域化探扫面成果,本文系统的统计了山西省Ag、As、Au、B、Ba、Bt、Bi、Cd、Co、Cr、Cu、F、Hg、La、Li、Mn、Mo、Nb、Ni、P、Pb、Sb、Sr、Th、Ti、U、V、W、Y、Zn、Zr、SiO_2、Al_2O_3、Fe_2O_3、MgO、CaO、Na_2O、K_2O等38元素的平均含量及其在不同地质单元中的平均含量、标准差、变异系数和浓集系数。并以Cu元素为例总结了元素的分布特征。     

1999年一季度我国基本有色金属及其制品的外贸

1999年一季度我国铜、铝、铅、锌、锡、镍六种基本有色金属及其制品的外贸结构虽无大的、根本性的变化,出口创汇的顺序是铝、铜、锌、锡、铅、镍;进口用汇顺序仍是铜、铝、锌、镍、锡、铅。     

标准样品的管理

目前,我厂使用的标准样品有:碳素钢、低合金钢、高锰钢、镍铬不锈钢、高温耐热钢、硼钢、铬钨钢、滚动轴承钢、高硅铝合金、生铁、铬钼铜合金、铸铁、稀土球墨铸铁、高铬铸铁、合金铸铁、中低碳素锰铁、中低炭素铬铁、硅铁、钛铁、烧结矿、高炉渣、锰矿、电炉渣、石灰石、萤石、硅砖、铬镁砖、镁砂、焦炭、煤等系列标准样品。在配合分析使用时,如何尽快的选择随心所需的标准样品,一度成为难题。现在能非常方便、快速、准确的找到。我们的做法如下:(1)建立台帐:新购回标准样品按不同系列分类,每瓶有新编序号,对标准样品的原编号、产地、…     

《稀有金属》(国内版)征稿及来稿注意事项

本刊是中国有色金属工业总公司主办的科技刊物,主要报道稀有金属(钛、钨、钼、稀土、锂、铍、铷、铯、锆、铪、钒、铌、钽、镓、铟、铊、锗、硒、碲、铼等)在选矿、冶炼、分析测试方面,稀有金属、有色金属材料科学与工程以及半导体材料的制备、测试等方面的科研、生产和应用成果。内容力求与国内科研、生产紧密结合,     

唐山唐钢气体有限公司

正唐山唐钢气体有限公司是由河北钢铁股份有限公司与中国气体工业投资控股有限公司共同投资创立的河北省第一家中外合资气体生产企业,注册资本7.78亿元,下设多家子分公司唐钢气体是集各类气体生产、运输、销售服务为一体的大型专业化气体公司主要生产和销售氧、氮、氦、氩、氢、二氧化碳、医用氧、车用天然气产品,并提供生产、销售、使用相关的技术咨询服务和运输,进行气体生产设备的研制。同时,从事氢、一氧化碳、硫化氢、甲烷、乙烷、丙烷、正丁烷、乙炔、丙烯、丙二烯、溶解乙炔、氯乙炔、环氧乙烷、硅烷、氯甲烷、氧、空气、氮、氦、氖、氩、氪、氙、一氧化二氮、二氧化碳、六氟化硫、氨、磷烷、一     

《太钢科技》投稿指南

《太钢科技》是太原钢铁（集团）有限公司根据党和国家的政策、法令创办的,经山西省新闻出版局批准备案的科学技术刊物。主要刊登太钢矿山、耐火、焦化、炼铁、炼钢、连铸、轧钢、锻造、理化检验、能源、机械、土建、计控、自动化、环保、安全等专业以及科研、工艺质量攻关、产品开发、技术开发和技术管理等方面的试验研究、科技成果、技术总结、综合评述和经验介绍等。     

《太钢科技》投稿指南

《太钢科技》是太原钢铁（集团）有限公司根据党和国家的政策、法令创办的,经山西省新闻出版局批准备案的科学技术刊物。主要刊登太钢矿山、耐火、焦化、炼铁、炼钢、连铸、轧钢、锻造、理化检验、能源、机械、土建、计控、自动化、环保、安全等专业以及科研、工艺质量攻关、产品开发、技术开发和技术管理等方面的试验研究、科技成果、技术总结、综合评述和经验介绍等。     

《太钢科技》投稿指南

《太钢科技》是太原钢铁（集团）有限公司根据党和国家的政策、法令创办的，经山西省新闻出版局批准备案的科学技术刊物。主要刊登太钢矿山、耐火、焦化、炼铁、炼钢、连铸、轧钢、锻造、理化检验、能源、机械、土建、计控、自动化、环保、安全等专业以及科研、工艺质量攻关、产品开发、技术开发和技术管理等方面的试验研究、科技成果、技术总结、综合评述和经验介绍等。     

ICP-MS测定地质样品中24种痕量元素干扰校正研究

研究并优化了ICP-MS同时测定地质样品中Ag、Ba、Be、Bi、Cd、Ce、Co、Cs、Cu、Cr、Li、Mo、Mn、Ni、Pb、Sb、Sc、Sr、Th、Tl、U、V、W、Zn 24种痕量元素的方法。通过选择适合的同位素,排除了同质异位素的干扰;通过降低CeO＋/Ce＋的比率,计算干扰校正方程,对难熔氧化物的干扰进行了校正;在线加入内标Rh,有效地抑制了基体效应。将该优化的方法经过国家一级地球化学标准物质验证（GSS-1、GSS-4、GSR-1、GSD-9、GSD-10）,精密度好,准确度高,检出限大都低于0.1 ng/mL。大量实际样品的分析结果表明,该方法对于化探样品测试技术的提高有一定的实用性。     

Guidelines for Warranty Contracting for Highway Construction

This paper presents guidelines for implementing the construction warranty contracting method in the highway construction industry. A logical, step-by-step method for effectively applying the warranty contracting program for use in the highway construction industry is developed. Relevant issues that may present obstacles to the implementation are addressed, while the best practices, compiled from an evaluation of the current industry’s state-of-the-art practices, will assist an interested state highway agency in creating a warranty specification. In performing this research, the current use of warranty specifications among state highway agencies was examined, and an in-depth case study of the Wisconsin Department of Transportation’s warranty program was conducted.     

Considerations for Design Criteria for Lunar Structures

The development of design criteria for lunar structures must begin soon in order to establish adequate criteria. Some of the items that need consideration in such criteria are discussed. The categorization of the structures will provide designers with information on the purpose and level of complexity of the structure. Various construction materials and structure types that will be critical for the design of lunar structures, are considered. The environment of the moon and its possible effects on structures are presented and lead to the development of a few load cases that need to be considered in design. A probabilistic format for the criteria and design lifetimes are also discussed.     

NEHRP Provisions for 1994 for Nonstructural Components

The recently published 1994 National Earthquake Hazards Reduction Program (NEHRP) provisions include new and substantially improved provisions for the seismic design of nonstructural components, including architectural, mechanical, and electrical components. The provisions are a significant departure from the 1991 NEHRP provisions and other seismic provisions, such as those offered by the 1994 Uniform Building Code (UBC). The design-force provisions are rationally derived and consider actual in-structure acceleration data recorded in recent significant California earthquakes. Also considered in the design-force equations are the dynamic properties of the components, the location of the component within the supporting structure, the safety and operational importance of the component, and the component's anchorage ductility and energy-absorption capability. The resulting force requirements of the new recommendations are compared with the 1991 NEHRP provisions and the 1994 UBC requirements. In addition, explicit design displacement provisions are introduced and discussed.     

An argument for colloid resuscitation for shock

A focused review of the physiologic mechanisms of colloid and crystalloid fluid resuscitations for acute critical illness is presented. This review suggests that postresuscitation plasma volume, cardiac output, left ventricular mechanical performance, and global and microcirculatory O2 supplies are more favorable with colloid therapy. Conversely, crystalloid may adversely affect microcirculatory blood flow and resultant O2 supply and use by ischemic tissues in shock. Poor relief of global and regional hypoxia may persist in critically ill patients after resuscitation with crystalloid.     

金属矿地震勘探钻孔方法研究

金属矿地震勘探一般位于复杂的山地和丘陵地区,而在这些地区开展地震数据采集工作有很大的难度。而这些问题产生的最根本的问题是激发成孔问题,只有成孔到合适的激发层位,才能获得较好的激发效果。本文主要依托某金属矿地震勘探研究项目,提出了一套经济、高效、便捷的钻孔方法。     

高速铁路用钢轨生产技术

采用铌稀土(BNbRE)钢种,进行了钢的高纯净度、无缺陷连铸坯、高精度轧制、在线检验及相关技术研究,形成高级别钢轨生产工艺.结果表明:生产的钢轨能够满足<时速200公里客运专线60 kg/m钢轨暂行技术条件>的技术指标.     

Evidence for clinical smoking cessation for adolescents.

Objective: This report reviews the evidence that informs the role of health and mental health care providers in addressing youth smoking cessation. Design: Qualitative literature review. Results: Physicians do not consistently screen adolescents for tobacco use and fail to provide recommended cessation advice. Challenges to addressing smoking cessation include the need for procedures to ensure confidentiality and the existence of competing demands to provide other services. Few published studies have specifically addressed the effectiveness of clinical interventions. Interventions that require return visits or follow-up phone contacts are technically difficult to implement in this population. Successful interventions may require resources not available in nonresearch settings. Most studies have used brief clinical intervention as a control condition, making it impossible to evaluate its effectiveness. Conclusion: There is little evidence that supports current clinical smoking cessation guidelines for adolescents. More research is needed to develop inexpensive, efficient clinical interventions that can provide youths access to smoking cessation help. Future challenges include reorganizing clinical systems to offer greater counseling by support staff or in electronic formats and to provide effective booster messages and follow-up care in a population that is difficult to track. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Motivations for dieting: Drive for thinness is different from drive for objective thinness.

Drive for thinness is a cardinal feature of bulimia nervosa. However, the widely used Drive for Thinness (DFT) subscale of the Eating Disorder Inventory (Garner, 2004; Garner, Olmstead, & Polivy, 1983) appears to measure a desire to be thinner, not a desire to be objectively thin. We developed the Drive for Objective Thinness (DFOT) Scale and compared unrestrained and restrained eaters and those with bulimia nervosa on the DFT subscale, Goldfarb's Fear of Fat Scale (GFFS; Goldfarb, Dykens, & Gerrard, 1983), and the DFOT Scale. Restrained eaters had higher scores than unrestrained eaters on the DFT subscale and the GFFS, but both groups had low scores on the DFOT Scale. Only the group with bulimia nervosa showed elevated scores on the DFOT Scale. We conclude that restrained eaters diet mostly to avoid weight gain, that individuals with bulimia nervosa diet to achieve thinness and avoid fatness, and that the drive for objective thinness is a unique feature of bulimia nervosa. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

低压锅炉投药中的几个理论问题

本文对低压锅炉锅水中的结垢物、硬度、碱度、投入的药剂等,在高温运行条件下的化学反应过程进行了理论分析,为控制锅水中各项主要指标达到水质标准和防止水垢的结生,提供了科学依据.