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   1011篇
  免费   54篇
各国政治   85篇
工人农民   34篇
世界政治   79篇
外交国际关系   100篇
法律   418篇
中国政治   7篇
政治理论   335篇
综合类   7篇
  2023年   4篇
  2022年   6篇
  2021年   19篇
  2020年   36篇
  2019年   35篇
  2018年   36篇
  2017年   51篇
  2016年   43篇
  2015年   43篇
  2014年   36篇
  2013年   179篇
  2012年   30篇
  2011年   45篇
  2010年   20篇
  2009年   36篇
  2008年   32篇
  2007年   43篇
  2006年   38篇
  2005年   29篇
  2004年   25篇
  2003年   29篇
  2002年   41篇
  2001年   15篇
  2000年   19篇
  1999年   15篇
  1998年   17篇
  1997年   16篇
  1996年   13篇
  1995年   5篇
  1994年   15篇
  1993年   10篇
  1992年   9篇
  1991年   8篇
  1990年   9篇
  1989年   6篇
  1988年   3篇
  1987年   6篇
  1986年   6篇
  1985年   4篇
  1984年   2篇
  1983年   7篇
  1982年   2篇
  1981年   3篇
  1980年   4篇
  1978年   2篇
  1977年   2篇
  1976年   4篇
  1974年   2篇
  1968年   1篇
  1965年   1篇
排序方式: 共有1065条查询结果,搜索用时 765 毫秒
991.
992.
993.
Thisc article documents lessons learned from a study of aid partnerships in post-conflict development and peace building in Bougainville. It examines how donor agencies, in this case the Australian Agency for International Development (AusAID) through the International Women's Development Agency (IWDA), contributed to the successes and failures of the Leitana Nehan Women's Development Agency (LNWDA). Although the donors contributed to the organisational development and capacity of the LNWDA, the balance of power remains unequal. Furthermore, the deployment of an intermediary body in the partnership exerts considerable pressure on the LNWDA, because it has to deal with multiple demands for accountability, which affect the impact of its own work on the ground. It is argued that in order to enhance the impact of their assistance, donor agencies need to develop a framework in which partnerships are sustained through mutual and less demanding accountabilities.  相似文献   
994.
The fulfilment of wealthy countries’ commitment to mobilise $100 billion a year in climate finance by 2020 will hinge on maintaining domestic political support in contributor countries. Predictability in flows of climate finance is likely to enhance the overall stability of the climate finance system and the broader climate regime. However, at present it remains unclear how the 2020 target will be achieved and little is known about what drives fluctuations in support among contributor countries. This article explores domestic and international factors that may explain fluctuations in national support through a case study of Australia’s climate finance from 2007 to 2015. Drawing on documentary analysis and interviews with officials and stakeholders, the paper tracks two domestic factors that may influence support for climate finance—the government’s political orientation and public concern about climate change—and two international factors—commitment to multilateral agreements and international peer pressure. While some accounts view climate policy choices as being driven primarily by domestic factors, we find that the government’s political orientation on domestic climate policy and aid explains some but not all variations in Australia’s stance on climate finance. International peer group effects have moderated the positions of two governments that were otherwise reluctant to act on climate change. National policy reforms combined with improved multilateral oversight and more established replenishment cycles could bolster support in contributor countries and thereby strengthen the capacity of the climate finance system.  相似文献   
995.
996.
Identification of 3,4-methylenedioxy-N-methylamphetamine (MDMA, ecstasy) in five cases of intoxication using nuclear magnetic resonance (NMR) spectroscopy of human urine is reported. A new water suppression technique PURGE (Presaturation Utilizing Relaxation Gradients and Echoes) was used. A calibration curve was obtained using spiked samples. The method gave a linear response (correlation coefficient of 0.992) over the range 0.01–1 mg/mL. Subsequently, quantitation of the amount of MDMA present in the samples was performed. The benefit and reliability of NMR investigations of human urine for cases of intoxication with MDMA are discussed.  相似文献   
997.
998.
An unidentified white powder collected as evidence in an intelligence investigation was characterized exclusively by nuclear magnetic resonance (NMR) analysis. A small fraction of the powder dissolved in D2O was subjected to a series of one- and two-dimensional techniques which were used to elucidate the molecular structure of the powder's major component and positively identify it as the scopolamine biotoxin. Quantitative one-dimensional experiments identified individual proton and carbon atom sites, and conventional 14N spectroscopy detected a single nitrogen atom site. Heteronuclear single quantum coherence data correlated all protons to their directly bonded carbon atom, and together with the quantitative spectra, were used to determine the number of protons directly bonded to each carbon atom. The presence of a methyl, carboxyl, and a benzyl group was also identified from these data. Correlation spectroscopy detected a three proton and a nine proton JH,H network, representing a CH2CH moiety and seven carbon atom ring, respectively. These five elements were assembled into an almost complete molecular structure by using long-range, J-coupled, 1H-13C pairs detected by heteronuclear multiple bond correlation (HMBC) spectroscopy and 1H-1H dipolar-coupled pairs found from nuclear Overhauser effect spectroscopy (NOESY) data. Additional oxygen atom sites were inferred from 1H-13C correlation intensities in the HMBC spectra along with 1H and 13C chemical shift values, or directly from NOESY correlations. Only a single oxygen atom site could not be inferred from NMR data, but its presence was inferred from comparisons to target analyte structures to complete the structure of the scopolamine molecule. To confirm these results, an ethanol/H2O solution of the powder was analyzed by direct infusion into an ion trap mass spectrometer. A prominent base signal was observed at m/z 304.1 amu, corresponding to the protonated molecular ion of scopolamine. Subsequently, the ion was selected and subjected to collision-induced dissociation, producing characteristic major MS/MS fragments at m/z 138.1 and 156.1. Comparisons of 1H and 13C chemical shift values and JH,H values measured from our NMR data were found to agree very favorably with previously reported values for scopolamine in D2O.  相似文献   
999.
For governments to regulate, they must first define the problem and decide which policymakers have the authority to make decisions. Technological development can disrupt the authority-allocation process by fostering uncertainty about which actors are responsible for making policy. This article examines the role that changing technology has played in the development of cybersecurity policy in the United States. New technologies have increased the type and scope of assets vulnerable to cyberthreats, and with them the number of governing units who can claim jurisdiction over cybersecurity-related issues. Uncertainty about the nature of the problem has led the U.S. Congress to rely heavily on bureaucratic witnesses and focus on how existing regulations can be brought to bear. Emerging technologies create regulatory challenges for governance not only through unforeseen consequences but through uncertainty over who can regulate. Fragmented authority can produce piecemeal responses and a reliance on existing frameworks that benefit regulated industries.  相似文献   
1000.
Health impact assessment (HIA) has been advanced as a means of bringing potential health impacts to the attention of policy makers, particularly in sectors where health impacts may not otherwise be considered. This article examines lessons for HIA in the United States from the related and relatively well-developed field of environmental impact assessment (EIA). We reviewed the EIA literature and conducted twenty phone interviews with EIA professionals. Successes of EIA cited by respondents included integration of environmental goals into decision making, improved planning, and greater transparency and public involvement. Reported shortcomings included the length and complexity of EIA documents, limited and adversarial public participation, and an emphasis on procedure over substance. Presently, EIAs consider few, if any, health outcomes. Respondents differed on the prospects for HIA. Most agreed that HIA could contribute to EIA in several areas, including assessment of cumulative impacts and impacts to environmental justice. Reasons given for not incorporating HIA into EIA were uncertainties about interpreting estimated health impacts, that EIA documents would become even longer and more complicated, and that HIA would gain little from the procedural and legal emphasis in EIA. We conclude that for HIA to advance, whether as part of or separate from EIA, well-formulated methodologies need to be developed and tested in real-world situations. When possible, HIA should build on the methods that have been utilized successfully in EIA. The most fruitful avenue is demonstration projects that test, refine, and demonstrate different methods and models to maximize their utility and acceptance.  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