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   642篇
  免费   38篇
各国政治   65篇
工人农民   49篇
世界政治   25篇
外交国际关系   37篇
法律   337篇
中国共产党   1篇
中国政治   4篇
政治理论   148篇
综合类   14篇
  2021年   5篇
  2020年   8篇
  2019年   9篇
  2018年   22篇
  2017年   29篇
  2016年   18篇
  2015年   10篇
  2014年   25篇
  2013年   94篇
  2012年   14篇
  2011年   19篇
  2010年   26篇
  2009年   28篇
  2008年   32篇
  2007年   17篇
  2006年   14篇
  2005年   19篇
  2004年   24篇
  2003年   13篇
  2002年   13篇
  2001年   8篇
  2000年   11篇
  1999年   11篇
  1998年   14篇
  1997年   8篇
  1996年   6篇
  1995年   6篇
  1994年   8篇
  1993年   6篇
  1992年   8篇
  1991年   13篇
  1990年   6篇
  1989年   7篇
  1988年   11篇
  1987年   13篇
  1986年   6篇
  1985年   9篇
  1984年   12篇
  1983年   15篇
  1982年   7篇
  1980年   4篇
  1979年   4篇
  1977年   4篇
  1976年   5篇
  1975年   3篇
  1974年   4篇
  1973年   3篇
  1971年   5篇
  1968年   4篇
  1965年   3篇
排序方式: 共有680条查询结果,搜索用时 31 毫秒
91.
92.
盖如垠书记到任哈尔滨后,提出了“北跃、南拓、中兴、强县”的发展战略构想,并经市委十二届七次全会丰富完善已成为哈尔滨未来发展的战略取向。通过学习市委全会精神,我们认为,这一战略构想符合哈尔滨的发展实际,十分及时地抓住了哈尔滨发展的关键和主轴,是哈尔滨经济社会实现跨越式发展的重要抉择。近期,我们班的全体学员对实施“北跃”战略——将松北新区打造成具有高能级发展功能的科技创新城问题进行了调研和思考,形成了此报告,供市委决策参考。  相似文献   
93.
Carbon‐based materials are often used as matrices for matrix‐assisted laser desorption/ionization mass spectrometry (MALDI‐MS) and its imaging (MALDI‐MSI). However, researchers have refrained from using carbon‐based fingerprint powder (CFP) as a matrix due to high background and contamination. In this work, the compatibility of CFP is reevaluated with MALDI‐MSI using a high‐resolution mass spectrometer (HRMS) and compared to traditional organic matrices. Relevant fingerprint compounds were easily distinguished from carbon cluster peaks when using HRMS. For fair comparison, half of a fingerprint was dusted with CFP while the other half was dusted with traditional organic matrices. All compounds studied had comparable, or higher, signal‐to‐noise (S/N) ratios when CFP was used as the matrix. Additionally, chemical image qualities closely followed the trend of S/N ratios. CFP proved to be an effective one‐step development and matrix application technique for MALDI‐MSI of latent fingerprints, when carbon cluster peaks are well separated by a HRMS.  相似文献   
94.
The high prevalence of alprazolam abuse translates to an increased workload for crime laboratories in characterizing seized tablets. These tablets may originate as diverted pharmaceuticals or counterfeited mimics, so efficient analytical techniques should provide confirmatory data while minimizing destruction of evidence. We offer the first report of a validated forensic method for confirming alprazolam tablets by direct analysis in real time-time of flight (DART-TOF) mass spectrometric analysis. This technique provides rapid identification of target analytes with minimal sample preparation, allowing direct analysis in the atmospheric sample gap. Selectivity is achieved through high resolution and mass accuracy, unique ion fragments, and chlorine isotopic ratios. This method utilizes fragmentation in two separate voltage functions to observe the alprazolam pseudo molecular ion at 309.09070 using 40 V and major ion fragments of 281.07197 and 205.07657 at 120 V. These parameters allow our laboratory to confirm alprazolam tablets efficiently, without compromising quality forensic standards.  相似文献   
95.
Is Google in its quest for search engine optimization through the creation of new technologies, which not only improves its search algorithms but also refines its search functions for users, doing it in a manner that makes it a perpetrator of primary copyright infringement or an invaluable facilitator for Internet functionality? How should the balance of interests in the treatment of creative works be recalibrated in the face of changes in search engine technology and operations, and the disputes that have arisen within the last decade in the context of the digital age and its needs? Using Google as a case study, this paper will look at the two main areas of dispute over the operations of information locator tools and services that either threatens search engine functionality and efficiency or weakens copyright holders’ exclusive rights. It proposes a concerted set of solutions through a reassessment and amendment of copyright law to optimize the social benefits and objectives of both the copyright regime and technological innovations in the electronic model of information archiving, indexing and delivery. A fair distribution of responsibilities and allocation of rights and liabilities will be suggested. In the process, due consideration will be given to both public and private interests, with the former taking precedence; while the recommended solutions will be made within the currently outdated framework for Internet intermediary protection (i.e. safe harbor laws) and exceptions (i.e. specific statutory exemptions and the general fair use defense) under the existing copyright regime. Thus, the proposed changes will be far reaching without being too radical a departure from current law, an evolution that will likely be more acceptable and realistic a solution to the problem.This paper is published in two parts. Part One of this paper published in the previous edition of the CLSR at [2011] 27 CLSR 110-131 dealt with the challenges to the copyright regime posed by the operations and technology behind the Google Images Search Engine, while Part Two will assess the benefits of the Google Books Search Project vis-à-vis the effects it will have on the scope of copyright protection. Recommendations are made to copyright law to accommodate both functions while generally preserving the main objectives of copyright protection.  相似文献   
96.
Does foreign aid reduce terrorism? We examine whether foreign aid decreases terrorism by analyzing whether aid targeted toward certain sectors is more effective than others. We use the most comprehensive databases on foreign aid and transnational terrorism??AidData and ITERATE??to provide a series of statistical tests. Our results show that foreign aid decreases terrorism especially when targeted toward sectors, such as education, health, civil society, and conflict prevention. These sector-level results indicate that foreign aid can be an effective instrument in fighting terrorism if allocated in appropriate ways.  相似文献   
97.
The desire to base policy at least in part upon scientific information is a clear trend in Australian governance. The growing literature on how to facilitate this intent highlights a few important principles complemented by examples from the application of social sciences. An example from a very large research project based on physical sciences responding to a national crisis is presented in the context of how it approached delivery to policy‐makers. The Murray‐Darling Basin Sustainable Yields Assessment, widely considered an outstanding success in both scientific terms and for its impact, is reviewed with respect to how the scientific challenge of assessing the future security of water resources in Australia's most important and politically contentious catchment translated into the policy domain. The lessons learned offer a potential template for science with policy intent.  相似文献   
98.
Sevoflurane concentrations in blood, brain, and lung were measured in an individual apparently dying from sevoflurane inhalation. Sevoflurane is a volatile nonflammable fluorinated methyl isopropyl ether inhaled anesthetic, chemically related to desflurane and isoflurane. The incidence of abuse of sevoflurane is lower than that of other drugs of abuse possibly due to its inaccessibility to the general public and less pleasurable and addicting effects. The dead subject was an anesthetist found prone in bed holding an empty bottle of sevoflurane (Ultane). Serum, urine, and liver were screened for numerous drugs and metabolites using enzyme immunoassays and gas chromatography-mass spectrometry. Analysis did not reveal presence of any drug, including ethanol, other than sevoflurane. Sevoflurane was determined by headspace gas chromatography and revealed concentrations of 15 microg/mL in blood and 130 mg/kg in brain and lung. Autopsy revealed pulmonary edema and frothing in the lung, pathological findings associated with death by sevoflurane or hypoxia. The cause of death was ruled as sevoflurane toxicity and the manner of death as accident.  相似文献   
99.
100.
The shift in socio-economic transactions from realspace to cyberspace through the emergence of electronic communications and digital formats has led to a disjuncture between the law and practices relating to electronic transactions. The speed at which information technology has developed require a faster, more reactive and automatic response from the law that is not currently met by the existing law-making framework. This paper suggests the development of special rules to enable Internet custom to form legal norms to fulfill this objective.  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