全文获取类型
收费全文 | 366篇 |
免费 | 14篇 |
专业分类
各国政治 | 15篇 |
工人农民 | 12篇 |
世界政治 | 34篇 |
外交国际关系 | 23篇 |
法律 | 168篇 |
中国政治 | 1篇 |
政治理论 | 120篇 |
综合类 | 7篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 5篇 |
2019年 | 7篇 |
2018年 | 14篇 |
2017年 | 11篇 |
2016年 | 10篇 |
2015年 | 7篇 |
2014年 | 10篇 |
2013年 | 67篇 |
2012年 | 6篇 |
2011年 | 4篇 |
2010年 | 11篇 |
2009年 | 7篇 |
2008年 | 8篇 |
2007年 | 11篇 |
2006年 | 15篇 |
2005年 | 9篇 |
2004年 | 13篇 |
2003年 | 9篇 |
2002年 | 16篇 |
2001年 | 6篇 |
2000年 | 3篇 |
1999年 | 5篇 |
1998年 | 6篇 |
1997年 | 9篇 |
1996年 | 10篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1986年 | 2篇 |
1985年 | 7篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1978年 | 6篇 |
1976年 | 2篇 |
1975年 | 4篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1970年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有380条查询结果,搜索用时 15 毫秒
371.
Karim M. Abdel‐Hay Ph.D. Jack DeRuiter Ph.D. C. Randall Clark Ph.D. 《Journal of forensic sciences》2015,60(2):285-294
A number of N‐substituted piperazines have been described as drugs of abuse in recent years. This new drug category includes several series of aromatic ring substituted phenylpiperazines. The wide variety of available precursors makes regioisomerism a significant issue in these totally synthetic compounds. In this study, a complete series of regioisomeric dimethoxyphenylpiperazines were synthesized and evaluated using GC‐MS and FT‐IR. The EI mass spectra show fragments characteristic of both the dimethoxyphenyl and the piperazine portions of the molecules including the dimethoxyphenylaziridinium cation (m/z 180) and dimethoxyphenyl cation (m/z 137). The ion at m/z 56 for the C3H6N+ fragment is characteristic of the piperazine ring and was observed in all the spectra. The perfluoroacyl derivatives were resolved by GC, and their mass spectra showed some differences in relative abundance of ions. FTIR provides direct confirmatory data for differentiation between the regioisomeric dimethoxyphenylpiperazines, and GC separation was accomplished on an Rtx‐200 phase. 相似文献
372.
Development, as an idea and an industry, is premised on the assumption that all states have the ability to raise the material wellbeing of citizens. For many this appears to be working but the ideal is problematic for a sub-set of the world's smallest countries: the Pacific Island states. These states have sought to develop conventional export trade-based economies but are disadvantaged in this, and in service sector development, by a combination of well-known factors, including resource bases, size and location. By default, migration has become a least-worst development option for many island peoples and governments, involving engagement with the periphery and contributing to income generation and poverty alleviation. This deterritorialisation presents an alternative to mainstream development theory and practice in its current state-centric form, and emphasises the emerging significance of non-state approaches to development. 相似文献
373.
Do Open Primaries Improve Representation? An Experimental Test of California's 2012 Top‐Two Primary 下载免费PDF全文
To improve representation and alleviate polarization among US lawmakers, many have promoted open primaries—allowing voters to choose candidates from any party—but the evidence that this reform works is mixed. To determine whether open primaries lead voters to choose ideologically proximate candidates, we conducted a statewide experiment just before California's 2012 primaries, the first conducted under a new top‐two format. We find that voters failed to distinguish moderate and extreme candidates. As a consequence, voters actually chose more ideologically distant candidates on the new ballot, and the reform failed to improve the fortunes of moderate congressional and state senate candidates. 相似文献
374.
Fanny Salignac Axelle Marjolin Jack Noone Gemma Carey 《Australian Journal of Public Administration》2019,78(2):227-249
The changing nature of organisations in the public sector means that collaboration has become an imperative for many. Notwithstanding considerable scholarly agreement about factors contributing to successful collaboration, a broadly accepted model of collaborative practice has not coalesced. In this paper, we put forward an augmented collaboration assessment tool. Building on existing research, we argue that systems thinking can help us better account for the dynamic and multidimensional nature of collaboration – a process in which partner organisations are interconnected and organised in a way that seeks to achieve a common purpose that they could not have achieved alone. We tested the validity of our tool using a three‐stage, iterative mixed‐methods approach. Our research confirms the value of a diagnostic tool to assist collaboration partners navigate an often uncertain terrain. It further establishes the value of our tool in illuminating a collaboration's dynamic interactions as a means to evaluate ‘collaboration health’. 相似文献
375.
376.
377.
Josep De Alcaraz‐Fossoul Ph.D. Carme Barrot‐Feixat Ph.D. Sara C. Zapico Ph.D. Michelle Mancenido Ph.D. Jennifer Broatch Ph.D. Katherine A. Roberts Ph.D. Clara Carreras‐Marin M.Sc. Jack Tasker B.Sc. 《Journal of forensic sciences》2018,63(4):1085-1091
A methodology to estimate the time of latent fingerprint deposition would be of great value to law enforcement and courts. It has been observed that ridge topography changes as latent prints age, including the widths of ridges that could be measured as a function of time. Crime suspects are commonly identified using fingerprint databases that contain reference inked tenprints (flat and rolled impressions). These can be of interest in aging studies as they provide baseline information relating to the original (nonaged) ridges’ widths. In practice, the age of latent fingerprints could be estimated following a comparison process between the evidentiary aged print and the corresponding reference inked print. The present article explores possible correlations between inked and fresh latent fingerprints deposited on different substrates and visualized with TiO2. The results indicate that the ridge width of flat inked prints is most similar to fresh latent fingerprints, and these should be used as the comparison standard for future aging studies. 相似文献
378.
Entrepreneurship and Legal Uncertainty: Unexpected Federal Trademark Registrations for Marijuana Derivatives 下载免费PDF全文
Though several states have legalized marijuana use, the drug remains illegal under federal law. Not surprisingly, the United States Patent and Trademark Office (USPTO) refuses to register trademarks related to marijuana because of the federal prohibition. What is surprising, though, is the willingness to grant trademarks for cannabidiol (CBD), a marijuana derivative that is likewise expressly illegal under federal drug laws. This article explains why the USPTO's divergent treatment of trademark applications for CBD and marijuana products is legally incoherent. Additionally, when viewed from an entrepreneurial perspective, this phenomenon exemplifies how legal uncertainty breeds entrepreneurial opportunity. Specifically, the article argues that the evolving regulatory landscape for CBD and marijuana products has been and continues to be ripe for legal strategists and innovative entrepreneurs to combine forces to create competitive advantage in the emerging marijuana industry. 相似文献
379.
This paper aims to contribute (1) to the understanding about how small technology-based firms in spite of being constrained by limited resources, can still perform exploratory and exploitative innovation and (2) to extend knowledge about the role of slack resources in the context of small technology-based firms in facilitating those innovation activities. Herein, we focus on two types of slack resources: internal slack, resources that are available within the firms and external slack, additional resources that are gathered through the facilitation of external sources such as business incubators. Using a sample of 141 small technology-based firms located at incubators, this study combined two streams of research on incubator studies and innovation to construct some hypotheses examining the role of slack resources and innovation activities in enhancing the performance of small technology-based firms operating in incubator setting. Our findings demonstrate that neither slack resources nor innovation activities alone explain firm performance. Instead, small technology-based firms fit their innovation activities to their slack resources. While the relationship between internal slack and performance is mediated by exploitative innovation, exploratory innovation plays a role as a mediator for the relationship between external slack and performance. 相似文献
380.
Vaccination involves the encounter of nonhuman biological matter and human bodies, recalibrating our susceptibility to illness and death. This boundary-crossing act has been caught in conflicting webs of moral significance, including the normalizing frameworks of public health governance and its corresponding forms of resistance. Such tensions and dynamics were a feature of smallpox vaccination - the first modern, systematic state-driven project to build population immunity. Focusing on smallpox vaccination in the British-ruled Straits Settlements (Singapore, Penang, and Malacca) between 1868 and 1926, we examine the recurrent features of contentions over vaccination from the tentative beginnings of the 1868 Vaccination Ordinance to the systematic extension of vaccination in the 20th century. Engaging science and technology studies of nonhuman agency and social theories on security, we argue that such contentions demonstrate the limits of a power formation we call governing through contagion (GTC). GTC centralizes law and other technologies to normalize public health measures that combat contagious diseases, while dysconnecting populations by its strategies of control. Our history of smallpox vaccination reveals: (i) GTC relies on the interconnectedness of human and nonhuman actors in protecting populations against viral threats; law is essential but does not necessarily drive vaccination or other strategies of control and (ii) resistance to GTC, in which law plays an integral role, reinforces inequalities and differentiated treatment, what we term endemic inter/dysconnectedness. 相似文献