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91.
The combination of photographs taken at two or three wavelengths at and bracketing an absorbance peak indicative of a particular compound can lead to an image with enhanced visualization of the compound. This procedure works best for compounds with absorbance bands that are narrow compared with "average" chromophores. If necessary, the photographs can be taken with different exposure times to ensure that sufficient light from the substrate is detected at all three wavelengths. The combination of images is readily performed if the images are obtained with a digital camera and are then processed using an image processing program. Best results are obtained if linear images at the peak maximum, at a slightly shorter wavelength, and at a slightly longer wavelength are used. However, acceptable results can also be obtained under many conditions if non-linear photographs are used or if only two wavelengths (one of which is at the peak maximum) are combined. These latter conditions are more achievable by many "mid-range" digital cameras. Wavelength selection can either be by controlling the illumination (e.g., by using an alternate light source) or by use of narrow bandpass filters. The technique is illustrated using blood as the target analyte, using bands of light centered at 395, 415, and 435 nm. The extension of the method to detection of blood by fluorescence quenching is also described. 相似文献
92.
In a series of experiments we show that people learn to playthe efficient outcome in an open-ended rent-seeking game. Thisresult persists despite quite different experimentenvironments and designs, like different propensities ofcompetition, group sizes etc., and is interpretable as aresolution of the so-called Tullock paradox which states thatreal-world rent-seeking expenditures are much lower than whatthe standard rent-seeking model predicts. 相似文献
93.
94.
While the concept of power has always been a concern to students of political science and public administration, it has been examined only peripherally in the last few years. Recent work by McClelland has indicated that power may be a very important variable in explaining managerial behavior and organizational effectiveness. Starting with a definition of power provided by McClelland, this paper develops a conceptual framework for analyzing power-related behavior in an organizational setting. The framework is then applied to a problem area of particular interest to the authors--the question of whether or not women managers can be expected to behave differently than their male counterparts because of possible differences in their orientations toward power. We conclude that differences in power needs will not impede the effectiveness of female managers, but women may be at a disadvantage in the work environment due to possible differences in the way they express these needs. 相似文献
95.
Joachim Behnke 《Politische Vierteljahresschrift》2003,44(1):41-65
Surplus mandates are an interesting peculiarity of the German electoral system and are a consequence of a special form of two-tier districting. Surplus mandates emerge if a party gains more constituency seats in any Bundesland than the total of seats to which it is entitled by its share of votes. Until 1990, surplus mandates were a subject of interest mainly for experts of constitutional law while exerting only negligible influence on the transformation of the electoral outcome in parliamentary seats. Since the election for the German Bundestag of 1990, however, the number of surplus mandates has increased significantly and so has the number of publications on their compatibility with constitutional law. The empirical aspects of the problem however have been largely neglected. In this article a model is developed which analyzes the effects of different factors in creating conditions which promote the emergence of surplus mandates. 相似文献
96.
Multistakeholder initiatives that bring together actors from the state, the business sector and society to formulate, implement and/or monitor rules governing different policy fields have assumed a prominent role in global governance since the 1980s. In the governance literature, it is generally assumed that the actors from the three sectors have diverse interests, but contribute different resources. This should allow to address transnational problems more effectively. While cooperation among the various collective actors in these initiatives might be based in part on complementary resources, we argue here that such cooperation is also shaped and conditioned by ideational prealignments of the participating actors. Such ideational prealignments are consequential, because they predetermine (1) the composition of multistakeholder forums in terms of which actors participate and which do not, (2) the processes that govern these forums, (3) the results of these forums and (4) the relations among the collective actors who participate in these forums and the stakeholders they are deemed to represent. When viewed from this perspective, multistakeholder initiatives are a form of club governance that is based on ideational factors. We illustrate this argument by drawing on research that examines the setting of standards for private military and security companies (PMSCs). 相似文献
97.
The ability of authoritarian regimes to maintain power hinges, in part, on how well they are able to manipulate the flow of information to the masses. While authoritarian states have had success controlling traditional media, the growth of social media over the last decade has created new challenges for such regimes. The Russian experience offers an example of how an authoritarian regime responds to this potential threat. Because of the massive demonstrations surrounding the 2011–2012 Duma elections, the ruling Russian government suspected that social media provided a significant impetus for the demonstrations. Social media, through its dissemination of opposition blogs, could have helped drive negative attitudes about the governing party. As such, the government responded by employing strategies to tighten their grip on the digital flow of information. We use survey data to demonstrate that exposure to blogs via social media at the time of the demonstrations led many to believe that the elections were fraudulent. Ultimately, we contend that Russian fears concerning the importance of social media for the fomenting of opposition movements is well grounded. Social media can drive support for opposition in an autocratic state. 相似文献
98.
AbstractIt is customary to argue that foreign policy is very much dominated by the executive, with parliaments wielding limited influence. However, with the exception of the US Congress, legislative?executive relations in the realm of foreign and security policy have attracted remarkably little scholarly attention. Drawing on a principal?agent framework, this collection scrutinises the conventional wisdom of ‘executive autonomy’ in foreign affairs, indicating that even though parliaments have arguably become more involved in foreign and security policy over time, any notions of parliamentarisation need to be treated with caution. While expectations of consensus in the name of the national interest continue to play an important role in foreign policy decision-making, the papers highlight the role of party-political contestation structuring parliamentary debates and votes in this increasingly politicised issue area. This introductory paper introduces the analytical framework and hypotheses guiding the contributions in this collection, summarises their main findings and suggests avenues for future research. 相似文献
99.
Jutta Joachim Andrea Schneiker Anne Jenichen 《Cambridge Review of International Affairs》2017,30(1):105-124
In 2008, the Council of the European Union (EU) adopted a ‘Comprehensive Approach’ that outlines a strategy for securing gender mainstreaming; two years later, the Council introduced a set of indicators to assess its implementation. The EU was responding to the United Nations Security Council’s call for regional institutions to assist in implementing Security Council Resolution (UNSCR) 1325, adopted on 31 October 2000, concerning ‘women, peace and security’. This resolution sought to meet the ‘urgent need to mainstream a gender perspective into peacekeeping operations’. Considering that prior exposure to gender issues, resources and well-established relations with civil society and gender advocates are lacking, the adoption of both the Comprehensive Approach and the indicators, as well as the structures and procedures established since then as part of the EU’s Common Security and Defence Policy, requires some explanation. This article draws on feminist institutionalist approaches to argue that the impetus for change came from individuals and groups within the EU who were involved in external networks, both above and below the supranational level, who seized on institutional idiosyncrasies that also shaped the implementation of UNSCR 1325 in important ways. 相似文献
100.
Declining trust in representative institutions is considered one of the most significant political problems of our time. It is often suggested that democratic innovations—or mechanisms which aim to increase and deepen citizen participation in the political decision-making process—can help reverse this trend. However, empirical research about actual effects of participation on trust is scarce, and weakened by causality problems. With survey data representing 1,470 participants in a landmark Swedish e-petition system, the article shows that both generalized attitudes and process evaluations matter in how trust is affected by democratic innovations. 相似文献