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   404篇
  免费   34篇
  国内免费   12篇
  2023年   2篇
  2022年   2篇
  2021年   11篇
  2020年   6篇
  2019年   8篇
  2018年   17篇
  2017年   21篇
  2016年   14篇
  2015年   4篇
  2014年   32篇
  2013年   38篇
  2012年   20篇
  2011年   34篇
  2010年   24篇
  2009年   33篇
  2008年   25篇
  2007年   19篇
  2006年   21篇
  2005年   11篇
  2004年   24篇
  2003年   13篇
  2002年   17篇
  2001年   22篇
  2000年   7篇
  1999年   5篇
  1998年   2篇
  1997年   5篇
  1996年   2篇
  1995年   4篇
  1993年   2篇
  1992年   4篇
  1991年   1篇
排序方式: 共有450条查询结果,搜索用时 31 毫秒
301.
合理的双语教师评价对于学校科学管理双语教师队伍,提升教师自身专业素养并最终提高双语教学质量具有重要价值和意义。新疆现有中小学双语教师评价内容存在思想偏差、依据不足、维度缺失、标准笼统等问题。本文以教师专业发展评价理论为基础,遵循整体性、适切性、公平性、开放性的评价原则,从双语教师专业理念、专业知识和专业能力三个维度出发,对新疆中小学双语教师评价的内容进行尝试构建。  相似文献   
302.
分析国际与国内消防技术装备的发展历程,从中寻找规律性的内涵;展望我国消防技术装备发展的趋势,指导消防装备建设规划.  相似文献   
303.
深入学习贯彻习主席视察武警部队时的重要指示,加快推进武警院校转型发展,培养高素质新型军事人才,必须提高党委把关定向能力,确保院校转型发展的正确方向;必须提高抓人才队伍建设能力,为转型发展提供强有力的人才支撑;必须提高创新发展解决难题的能力,营造转型发展的良好环境。  相似文献   
304.
Abstract

This study seeks to estimate the causal effects of PKK separatist terrorism on economic development in Turkey using the synthetic control method. By creating a synthetic control group that reproduces the Turkish Gross Domestic Product (GDP) before PKK terrorism emerged in the late 1980s, we compare the GDP of the synthetic Turkey and the actual for the period 1955–2008. Our study finds that the Turkish per capita GDP would have been higher by about $2600 had it not been exposed to terrorism. This translates into an average of 21.4% higher per capita GDP over a period of 21 years.  相似文献   
305.
DAR ES SALAAM     
Countries in transition often experience increased levels of crime, making their citizens vulnerable to the exploits of criminals. The lack of reliable statistics hampers the development of sound crime reduction strategies. This essay considers the value of victim surveys as additional sources of information to augment official police data. It presents the findings of such a survey undertaken in Dar es Salaam and compares them with findings obtained in similar surveys of Cape Town, Durban, Pretoria and Johannesburg. The information obtained in the survey conducted in Dar es Salaam provides valuable insights into crime rates and patterns. In comparing the results of the survey in Dar es Salaam, some interesting trends emerged around the theft of vehicle parts and vehicle theft, violent crimes, the levels of violence employed in burglaries and the use of weapons. The information gleaned from these surveys will go far in developing crime reduction strategies and measures that will be effective and appropriately targeted.  相似文献   
306.
The Arab Spring, a pro-democracy uprising that has been sweeping through North Africa and the entire Arab world since 2010, has been described as a cataclysmic revolutionary wave that has left the overthrow of political regimes in its wake. Studies have comprehensively x-rayed the political and socio-economic circumstances that gave rise to the uprising. Apart from the impact of the uprising on political developments and democratic governance in the Arab world in particular and the world in general, the circumstances that resulted in the revolutions constitute empirical security implications for Nigeria. This is the focus of this article. Using the Ibrahim Index of African Governance (IIAG) and other selected indicators, this article draws a comparative analysis of the key factors that led to the uprisings in Egypt, Libya and Tunisia, pointing out areas of social and security tensions in Nigeria. Based on these findings, it points out the urgency of and imperative for security sector reforms in Nigeria.  相似文献   
307.
Africa has emerged as a strategic location for transcontinental narcotics trade. Particularly the West African subcontinent has turned into a cocaine warehousing and trans-shipment hub along the way to the European underground markets. At this juncture, African drug networks (ADNs) began to play a momentous role in global drug trade, and pose a considerable threat to international security, as they operate in more than 80 countries. The United Nations Office on Drugs and Crime, Interpol, and Europol perceive ADNs as one of the primary issues in international counter-narcotics policy. These agencies have launched several multilateral initiatives to contain the West African threat. None of these initiatives, however, retarded the expansion of the problem. Indeed, the containment efforts turned out to be quite embryonic. The ADNs eventually entered the Turkish market by the early 2000s. West African drug networks (WADNs) in particular have begun to operate within Turkey extensively, often supplying and distributing drugs. The gravity of the threat became ever more serious by 2012. The upsurge of the new threat has compelled the Turkish drug-law enforcement agencies to adopt new policies and counter-strategies. These policies have to be based upon proper strategic analysis of the threat. This paper seeks to address the need for a threat assessment of ADNs. It investigates the dimensions of the problem, profiles the members of WADNs, their modes of operation, and the factors that compelled them to exploit the illicit Turkish drug markets. The analyses are based upon the scrutiny of 227 narcotic interdictions files and statements from the African individuals in these case files. The paper concludes by presenting policy implications and recommendations for the Turkish security and foreign-policy institutions to cope with this impending threat.  相似文献   
308.
SECURITY BRIEF     
Using crime review figures for four randomly selected states in Nigeria, this study examines cases of kidnapping and its implications for the national economy. The findings reveal that kidnapping is consistently on the increase in Nigeria and is not evenly spread across regions. It is shown that 15 cases were recorded in 2005 and 43 cases in 2008. In 2009, 138 cases were officially recorded, of which 22% and 76% occurred in Rivers and Edo states respectively. Findings further showed that modern kidnapping in Nigeria is triggered by resource control disputes directed both at oil expatriate workers and at prominent citizens, politicians and members of their families. The crisis, which came to the fore in 2005, has forced oil production shutdowns of up to 800 000 barrels per day. The study concludes that kidnapping is becoming a serious crime in Nigeria with significant negative implications for foreign investment, national foreign exchange earnings, and revenue generation.  相似文献   
309.
Gun violence is one of the most serious health problems in Brazil. Information on gun deaths and injuries is collected by the Ministry of Health. This data has been used very successfully to inform and design public policies for preventing gun violence. This article analyses the use of public health information by researchers and activists, as well as government officials and the media, to reveal the severity of firearm injuries and deaths and to gain consensus on the need for reforms to national gun laws. It also assesses the resounding ‘no’ vote in a recent disarmament referendum to decide whether to prohibit the sale of guns and ammunition. The results of the Brazilian referendum are a lesson to other countries struggling to deal with high levels of gun violence, showing that it may not always be enough to have data to back up efforts to change policies—as people's decisions around gun ownership and use, as well as their choices regarding security policies, are motivated by a complex interaction of factors.  相似文献   
310.
从X-47B看美国无人作战飞机发展   总被引:1,自引:0,他引:1  
无人作战飞机代表了航空装备无人化发展的方向.美国X-47B无人作战飞机已经完成了航母上自主弹射起飞和拦阻着舰,标志着美军海空作战模式将发生革命性的改变.这是人类的一小步,但对于无人系统来说却是技术发展的一大步.文章以X-47B为例,回顾了美军无人作战飞机的发展历程,分析了美军对无人作战飞机的概念和认识的变化,以及无人作战飞机对未来空中作战的影响,总结了值得借鉴的经验和教训.  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