共查询到20条相似文献,搜索用时 78 毫秒
1.
《世界有色金属》2006,(8):30-30
老挝位于东南亚地区,北临柬埔寨,南靠中国,西面是越南,东南部是缅甸,东北部是泰国,是一个国土面积仅有237,000平方公里的小国。2005年,人口总数为6,200,000。老挝是亚太地区最贫穷的国家之一,已知的矿产资源有铝土矿,黏土,煤,铜,白云石,黄金,石墨,石膏,石灰岩,石盐,蓝宝石,银,锡,及锌等。老挝2005年的国内生产总值增长率为7.3%,2004年增长率为6.3%。老挝具有得天独厚的地质环境优势,潜在的矿产有:锑,石棉,铋,钴,铁矿,瓷土,铅,褐煤,镁,钼,钾碱,硅沙,及钨等。另外,该国很可能储藏有煤,铜,黄金,铁矿,钾碱,岩盐,及锡等。据老挝工业及手工业部(M… 相似文献
2.
通过对主导产业定义的解释,及其性质的概述,结合内蒙古的实际情况,论述了内蒙古如何根据自身的要素优势,大力发展畜牧业及其加工业,能源业,冶金业,以高科技改造传统产业,实现经济、产业的跳跃式发展. 相似文献
3.
4.
5.
朝鲜民主主义人民共和国,位于朝鲜半岛的北半部地区,国土总面积约为120,540平方公里,大概相当于美国宾夕法尼亚洲的面积。2004年全国总人口约为2270万。朝鲜的经济由政府严格控制并实行中央计划。2004年,国家基于购买力平价理论计算的GDP和人均GDP分别为309亿美元和1,400美元。朝鲜主要的矿物资源为煤炭,铜,氟石,金,石墨,铁矿石,铅,石灰石,菱镁矿(碳酸镁),黄铁矿,盐,银,钨,锌,其中铁矿石、石灰石和菱镁矿储量较大,天然气和原油的储量较小。朝鲜2004年实际的GDP估计增长了2.2%。以2004年朝鲜经济结构为基础,初级品部分(包括农业和渔业)占… 相似文献
6.
铝热法冶炼钒铁过程中,炉底被烧结,产生含钒烧结渣.烧结渣中含有大量的钒,从而造成钒的损失,降低了钒的回收率,增加了生产成本.本试验通过对炉底打结材料和冶炼布料方式的优化,大大改善了炉底烧结状况,减少了含钒烧结渣的产出量,同时烧结渣中钒的含量也大幅度降低,从而减少了钒的流失,钒的回收率提高0.5%以上. 相似文献
7.
铜是与人类关系非常密切的有色金属,被广泛地应用于电气、轻工、机械制造、建筑工业、通讯行业、国防工业等众多领域,2003年,全球消费铜约1551万t。过去,铜的消费主要集中在发达工业国,随着中国近几年经济的迅猛发展,铜的需求随之高速成长,现在中国已成为全球最大的铜消费国,2003年中国铜的消费量已达到300万t左右,约占全球总的消费量的1/5。铜工业是产业关联度较高的产业,铜的消费水平同经济发展关系密切,一般而言,当经济走出衰退并且向上增长时,工业上的需求增加,驱动铜的消费量上扬;相反地,当经济滑坡时,铜的供应过剩,消费的需求就减少。… 相似文献
8.
国有老企业面对设备陈旧、技术落后、设备改造量大,一次性投入高,节能新技术、新产品、新材料、新设备发展快速的实际情况,如何实现节能减排,怎样跟上节能科技的发展速度,是新形势下企业经营管理工作的重点.文中结合企业实际,从总体规划、逐步实施,设备选择与评价,设备的全过程管理等方面介绍了动态设备更新的实践.实践表明,实行动态设备更新,实现了企业的节能减排,提高了企业的管理水平,增加了企业的效益. 相似文献
9.
什么样的人说什么样的话,温文尔雅的林黛玉,断断不可能说出王熙凤的凌厉机巧。段正渠生于生于河南偃师,具有河南人所具有的勤劳、坚毅、包容,坚韧不拔和朴实,其绘画,没有花哨的斑斓色彩,更少有矫饰的装饰构成,手法平实、大气有力。 相似文献
10.
黄悦 《Canadian Metallurgical Quarterly》2011,(13)
万物之出先有节奏,节奏是音乐的生命,广义的节奏意味着时间的匀称划分,它包括,和声的节奏,音乐的脉动,节拍,乐句,语气,结构的安排,速度,乐段乐章等要素。在整个音乐表现中,节奏的特点是音乐风格的基本要素,也是辨别各不同时期、不同地区音乐风格的重要标志。因此,在学习音乐的过程中,节奏的训练是十分重要的。本文试图从钢琴学习的角度对节奏的训练作一些探讨和论述。 相似文献
11.
12.
从7UM62型同步电机保护装置出现的故障现象入手,剖析了故障产生的原因,阐述了故障处理过程及防范措施。 相似文献
13.
14.
15.
This study is an attempt to analyze Hitler's decision making during World War II. Based on detailed historical sources, we specifically analyzed Hitler's decision-making failures and investigated the possible causes for these failures following theories on cognition, motivation, and action regulation. Failures such as underestimation of an opponent and overestimation of one's own capabilities, the displacement of responsibility for failures on scapegoats, the substitution of easily solvable problems for difficult ones, methodism in decision making, and lack of self-reflection are discussed and detailed examples are provided. These failures ultimately functioned to maintain Hitler's self-confidence. We integrate the failures into a model that explains the origins of Hitler's decision making. Although Hitler's behavior could certainly be judged as “evil,” the analysis goes further and thus can help leaders learn from these failures. (PsycINFO Database Record (c) 2011 APA, all rights reserved) 相似文献
16.
Analysis of Recent Bridge Failures in the United States 总被引:3,自引:0,他引:3
Over 500 failures of bridge structures in the United States between 1989 and 2000 were studied. The age of the failed bridges ranged from 1 year (during construction) to 157 years, with an average of 52.5 years. The most frequent causes of bridge failures were attributed to floods and collisions. Flood and scour, with the major flood disaster in 1993, contributed to the frequency peak of bridge failures (almost 53% of all failures). Bridge overload and lateral impact forces from trucks, barges/ships, and trains constitute 20% of the total bridge failures. Other frequent principal causes are design, detailing, construction, material, and maintenance. Comparison made among three periods of similar studies (1977–1981, 1982–1988, and 1989–2000) revealed almost similar trends, with most failures occurring during the bridge’s service life. Also, human-induced external events occurred frequently in all three periods, but were most dominant in the first and third periods. Technological advances in information systems have a great impact on data collection and analysis. 相似文献
17.
18.
19.
Hans Korving Fran?ois H. L. R. Clemens Jan M. van Noortwijk 《Canadian Metallurgical Quarterly》2006,132(10):1076-1085
Sewage pumping stations represent an element of the sewer system, which is directly responsible for affecting serviceability; i.e., failing pumps may result in combined sewer overflows or flooding. However, failures of sewage pumps are not yet incorporated in sewer assessments due to lack of data. This paper presents the analysis of pump failure data provided by two sewer management authorities in The Netherlands. Pump failures have been studied accounting for the nature of the failures, the operation and maintenance procedures of the management authority, the aging of the pumps, and the changes in the environment of pumps. The analysis shows that sewage pumps fail relatively often due to the composition of sewage and the discontinuous operation of the pumps. The interarrival time and the duration of failures are highly variable and independent of the specific function of the pump. Resulting pump failure characteristics are applied in a Monte Carlo simulation to calculate the impact of failures on combined sewer overflow volumes. The results indicate that the serviceability of sewer systems is significantly affected by failing pumps. Therefore, including pump availability in sewer system assessments should be considered. 相似文献
20.