首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   185篇
  免费   10篇
  国内免费   2篇
  2021年   1篇
  2020年   7篇
  2019年   4篇
  2018年   8篇
  2017年   19篇
  2016年   15篇
  2015年   1篇
  2014年   9篇
  2013年   97篇
  2012年   3篇
  2011年   3篇
  2010年   4篇
  2009年   1篇
  2008年   2篇
  2007年   3篇
  2006年   2篇
  2005年   2篇
  2004年   7篇
  2003年   1篇
  2002年   5篇
  2001年   2篇
  1999年   1篇
排序方式: 共有197条查询结果,搜索用时 46 毫秒
111.
从吉化双苯厂爆炸事故处置解读化工火灾扑救对策   总被引:1,自引:0,他引:1  
吉化双苯厂“11.13”爆炸火灾事故是一起典型的化工类火灾事故,造成了严重的财产损失和人员伤亡。这起火灾爆炸事故具有爆炸、燃烧速度快、立体式燃烧、过火面积大、危害性大等特点,总结了这起事故处置经验,给出了准确判断,科学决策;快攻近战;统一指挥,协同作战;多种措施相结合;冷却防爆,堵截蔓延;隐蔽抵近,适时出击等处置化工类火灾的对策。  相似文献   
112.
随着我国石油天然气生产、消费比重的不断增大,与之相应的消防安全隐患也有增大的趋势。为此,应加强生产安全规章制度的建立和落实,加大消防硬件的建设和合理化部署,加大监管措施和力度,最大限度减少石油化工行业的灾害,为石油天然气的战略调整提供安全保障。  相似文献   
113.
化工装置灾害事故模式的研究,有益于从源头上做好灾害事故的预防工作。在介绍传统事故模式分析方法的基础上,提出了基于层次聚类法的化工装置火灾爆炸灾害事故模式分析方法,并对近20年100起相关灾害事故案例进行了模式分析研究。  相似文献   
114.
The paper presents an analysis of the factors explaining the export performance of firms in the defence sector. We focus on the case of Norway, and make use of two complementary methodologies: the first is based on econometric firm-level data analysis for the whole population of defence companies, and the second is based on qualitative case study research on the three most important defence export products (weapon stations, ammunition and electronics). Our empirical results highlight the importance of four major success factors for exporting firms: (1) the participation in offset agreements; (2) the ability to focus on their set of core competencies; (3) their R&D activities and interactions with the public S&T system; and (4) demand opportunities and, relatedly, user-producer interactions.  相似文献   
115.
There is much controversy in the literature over whether military expenditures have a positive, negative or no relation impact on economic growth. The aim of this paper is to determine the relationship between GDP and defence expenditure. The study analyses GDP and defence expenditures of the developed countries with cross-sectional ADF and SURADF unit root tests using annual data for the years 1980–2007. We conclude that in the long term, according to the Pedroni cointegration test, there exists a relationship between defence expenditure and economic growth. Furthermore, by utilizing the Granger causality test, we find that defence expenditure is a factor in economic growth. In other words, our study validates the hypothesis that defence spending by economically developed countries positively contributes to their economics.  相似文献   
116.
During their 60 years within the North Atlantic Treaty Organisation (NATO), Denmark and Norway have experienced both high and low standings within the alliance, which can be attributed to both external and internal factors influencing their alliance strategies. During the ‘first’ Cold War and Détente, 1949–79, Danish and Norwegian alliance strategy aimed to simultaneously deter and reassure the Soviet Union. During the ‘second’ Cold War, 1979–89, Danish alliance policy became driven by domestic politics, and the Danish government was forced to formally dissociate the country from NATO's policies. Norway was not uncritical, but held a much lower profile. After the Cold War this situation shifted. Denmark successfully rehabilitated itself as a loyal and dependable ally by responding to the call for focusing on out-of-area operations. Meanwhile, Norway's continued focus on the lingering Russian Threat made the country seem out-of-touch with priorities in the post-Cold War alliance, and domestic politics prevented a more active out-of-area engagement.  相似文献   
117.
This article presents a flexible days‐on and days‐off scheduling problem and develops an exact branch and price (B&P) algorithm to find solutions. The main objective is to minimize the size of the total workforce required to cover time‐varying demand over a planning horizon that may extend up to 12 weeks. A new aspect of the problem is the general restriction that the number of consecutive days on and the number of consecutive days off must each fall within a predefined range. Moreover, the total assignment of working days in the planning horizon cannot exceed some maximum value. In the B&P framework, the master problem is stated as a set covering‐type problem whose columns are generated iteratively by solving one of three different subproblems. The first is an implicit model, the second is a resource constrained shortest path problem, and the third is a dynamic program. Computational experiments using both real‐word and randomly generated data show that workforce reductions up to 66% are possible with highly flexible days‐on and days‐off patterns. When evaluating the performance of the three subproblems, it was found that each yielded equivalent solutions but the dynamic program proved to be significantly more efficient. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 60: 678–701, 2013  相似文献   
118.

The Soviet Union was able to develop a large military-industrial complex and become the world's second superpower despite deficiencies in its centrally planned economy because defence was given high priority status and special planning, rationing and administrative mechanisms were used to attain national security objectives. However, in the period 1976-85 the effectiveness of priority protection diminished and defence institutions experienced more of the problems typical of the shortage economic system. The heavy defence burden also created growing difficulties for the civilian economy. The attempts by the Gorbachev government to reform the defence sector and improve defence-economic relationships during perestroika (1985-91) uniformly failed. For most of the transition period, the Russian military-industrial complex has been adversely affected by its low priority status, cuts in defence spending, instability of the hybrid politico-economic system, and negative growth of the economy. The armed forces and defence industry have been reduced in size and their outputs of military services and equipment have fallen to low levels. Nevertheless, the Russian armed forces still have over one million troops, significant stocks of sophisticated conventional weapons, and a large nuclear arsenal. The government of President Putin has raised the priority of the defence sector, increased real defence spending, and adopted ambitious plans to revive Russian military power. It is likely, though, that tight resource constraints will hamper efforts to reform the armed forces and to upgrade weapons. By 2010 Russia will be an important, but not dominant, military power in Eurasia.  相似文献   
119.

New Zealand's current defence strategy, first expressed in NZ Government (1991), is one of "self-reliance in partnership". We outline the country's defence policy in historical context, examine its current defence expenditure and capabilities, and document the genesis of recent major changes in security policy. We pay particular attention to the role of explicit economic analysis and advice in the formation of these policy changes.  相似文献   
120.
Australia is a geographically large country, with the world's longest national coastline to defend, but a relatively small economy of some 17.5 million people. Since World War II, Australia has faced the dilemma of how to structure defence policy in the absence of an identifiable threat. Its policy of self‐reliance aims to permit Australia to conduct defensive operations in the event of low/medium level threats without depending immediately on its allies. This is to be achieved through the technological sophistication of defence equipment, a highly professional but small defence force and local industry support.

The burden of defence, measured as the share of defence outlay in GDP declined from about 3% in 1971–72 to about 2.3% in 1993–94. It has been the Government's policy to encourage the development of local defence‐related industry, in particular in areas such as: electronics/optics; communications and information technology; aerospace; shipbuilding and repair, munitions; and land vehicles. However, defence procurement has a small impact on the Australian economy as a whole.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号