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   1652篇
  免费   58篇
  2024年   1篇
  2023年   18篇
  2022年   21篇
  2021年   36篇
  2020年   76篇
  2019年   69篇
  2018年   76篇
  2017年   84篇
  2016年   84篇
  2015年   57篇
  2014年   48篇
  2013年   341篇
  2012年   134篇
  2011年   59篇
  2010年   51篇
  2009年   70篇
  2008年   72篇
  2007年   55篇
  2006年   51篇
  2005年   33篇
  2004年   41篇
  2003年   42篇
  2002年   25篇
  2001年   38篇
  2000年   17篇
  1999年   11篇
  1997年   9篇
  1996年   7篇
  1995年   9篇
  1994年   8篇
  1993年   2篇
  1992年   14篇
  1991年   9篇
  1990年   2篇
  1989年   5篇
  1988年   5篇
  1987年   7篇
  1986年   5篇
  1985年   5篇
  1984年   10篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
排序方式: 共有1710条查询结果,搜索用时 15 毫秒
41.
42.
In the Iberian Peninsula, the copper metallurgy from the Chalcolithic to the Middle Bronze Age (MBA) was mostly characterized by low arsenic contents. A collection of 53 MBA artefacts from southern Portugal was analysed by micro‐EDXRF, optical microscopy, SEM–EDS and Vickers to investigate the metal composition and manufacture. No technological distinction was found between artefacts from domestic and funerary contexts, which were radiocarbon‐dated to 2000–1500 cal bc . The arsenic contents of almost 100 MBA artefacts from this region, including the above‐mentioned set, have a Gaussian distribution with a high average (3.9 wt% As). Possible explanations are discussed for this distinctive metallurgy at the south‐western end of the Iberian Peninsula.  相似文献   
43.
Metallurgical analyses and chemical characterizations were carried out on historical cannonballs from the Fortress of San Juan de Ulúa, Veracruz, México. Cannonballs dating from the 18th and 19th centuries share metallurgical characteristics similar to those of material coming from a shipment of ammunition found in the wreck of a sunken French ship from the battle of Trafalgar. The analyses show that the base material is grey cast iron with a carbon equivalent of 4.94 and a ferritic–perlitic matrix, in which the high phosphorus content has led to the formation of iron phosphide compounds in conjunction with a homogeneous distribution of carbon graphite flakes of Type C. In addition, corrosion products from samples revealed the presence of various crystalline iron compounds (X‐ray diffraction), mostly highly chlorinated iron compounds identified as akaganeite. X‐ray fluorescence identified various characteristics of the corrosion products as a function of the sampling depth. FT–IR spectroscopy revealed that the main difference between the corrosion products (internal and external) is determined by the number of organic species. Differential scanning calorimetry corroborated that these corrosion products are thermally stable compounds at elevated temperatures.  相似文献   
44.
民国《贵州通志·艺文志》著录黄彭年撰《尔雅集韵》一书。而追索《艺文志》著录的史源,并取其他史料相印证,推寻其致误的原因,证明黄彭年曾批校《尔雅》《集韵》二书,但并未撰《尔雅集韵》一书。此外,又据各家书目题跋,梳理了黄彭年批校《集韵》的经过及其批校本流传情况。  相似文献   
45.
When studied through canon law and scholastic pastoralia produced in the universities in the thirteenth century and beyond, medieval pastoral care comes across as spiritual care, more specifically the administration of sacraments and preaching, provided by the clergy for the faithful. This article complicates that view by arguing that in the twelfth century, the laity alongside the clergy was active in the provision and organisation of pastoral care. The sources examined are the surviving statutes of five religious confraternities – along with the obituaries and sermons in two cases – in Italy that flourished in the twelfth century and before. Each of these confraternities was centred around a church, established after an apostolic ideal, included laymen and women and local pastoral clergy of all levels, met regularly to celebrate the Eucharist, prayed for the dead members and made public confessions. Members prayed for and attended to the corporal needs of each other in case of sickness. In the final analysis, these twelfth-century confraternities appear as transitional institutions between the early medieval monastic confraternities focusing on prayer and the late medieval and renaissance confraternities focusing on charity. Their study opens a window onto the lay expectations of and contribution to pastoral care in medieval Italy.  相似文献   
46.
In 1995, Banal Nationalism set a new way to study nationhood. Away from the traditional concern with its historical origins (‘when’) and its substantialist features (‘what’), Banal Nationalism offered a systematic analysis of its reproduction (‘how’). Informed by social and discursive psychology, Billig pointed to the role played by familiar, unremarkable ‘little words’ (deixis) to explain the persistence and pervasiveness of the idea of a world divided into nations. The present article aims to expand Billig’s seminal study on the reproduction of nationalism, by incorporating an ‘everyday nationhood’ perspective, which attends more closely to human agency and contextual interaction. To give empirical substance to this move, the article relies on photo-elicitation group discussions and written essays collected in a vocational school in Milan, Italy, among an ethno-culturally diverse sample. By bringing the voices of people in as active producers of national meanings, the article offers a more complex picture of a world banally divided into nations. Both a national ‘we’ and a national ‘here’ emerge in fact as socio-spatially differentiated, fragmented and articulated at a plurality of scales, thus defying the logical linearity of banal nationalism, which unwittingly reproduces nations as singular, internally homogenous discursive entities. The article concludes by arguing for the need to complement the banal with the everyday in order to more fully capture processes of national reproduction in contexts of increasing ethno-cultural diversity.  相似文献   
47.
This paper explores the effectiveness of policies ‘in’ attracting the foreign research and development (R&D) of multinational enterprises (MNEs) to specific countries in Europe. We develop a macroeconomic investigation covering 29 European countries during the period between 1990 and 2012 in order to address: (a) whether the provision of direct financial support for business R&D is effective for the attraction of foreign R&D; (b) whether direct support is more effective than indirect support for this purpose and (c) whether the link between direct financial support for business R&D and the foreign R&D of MNEs is conditioned by the context within which the support is provided. The results of the analysis show that, first, the provision of direct financial support is generally effective for the attraction of foreign R&D by MNEs. Second, direct support for business R&D is more effective for this purpose than indirect support. Third, the provision of direct financial support for business R&D yields greater returns in contexts that are more socio-economically suitable for knowledge-intensive, innovative activity.  相似文献   
48.
ABSTRACT

The Eichmann trial held in Jerusalem in 1961 marked a turning point in the international public’s collective awareness of the extermination of Jews in Europe. In Italy, the trial contributed to the mainstream narrative of the events that concerned the deportations of the Jews. The Italian case was mentioned in the indictment of the attorney general, Hausner, and in the deposition of the only witness present at the trial, Hulda Campagnano. In this article, our analysis of the trial’s reception in Italian newspapers and media shows that the Jerusalem reports, especially through misrepresenting the words of Campagnano, created the image of Italians as ‘good people’, who would help Italian and foreign Jews, against the wishes of the Nazis. At the same time, the responsibility of Italian Fascism for the anti-Jewish laws in 1938 and the role of Italians in the arrests and deportations of Jews since 1943 have been neglected.  相似文献   
49.
In 2004, a controversy arose in Aotearoa New Zealand's coal mining sector that involved Powelliphanta augusta, a species of land snail. This paper considers that controversy in terms of emergent assemblages involving the snail, the mining industry, the Department of Conservation, political action by environmental non‐government organisations, and public expressions of environmental and other values. Three sets of relations embedded in those assemblages are examined—those related to positioning and organising nature; values, politics, and power relations; and human and non‐human materialities. Those relations illuminate how a protracted controversy and its objects form a “social test bed” for contested views in legislation and guidelines dealing with economy, conservation, and restoration. To assess the dynamics, complexities, and contingencies of such relations, attention is paid to the controversy's detailed time line and legal framing, as well as to ontological shifts of snail and habitat and snail metrics. This analytical focus highlights the shifting quality of ideas about how the snail and its habitat are understood as entangled in fraught and mutating strategies of translocation that are played out in a particular regulatory setting. It also provides insights into international geographical efforts to re‐shape environmental governance and management.  相似文献   
50.
With the onset of the Arab uprisings at the end of 2010 and the emergence of popular demonstrations that raised the issue of crises of legitimacy across the Arab states, the literature on democratization in the Middle East and North African (MENA) studies has taken on new dimensions recently. One of the primary theoretical debates that has surfaced in the post‐2011 era has revolved around on whether or not the demonstrations will lead to regime change or increased authoritarianism in the MENA region. One of the crucial developments of the Arab Spring has, then, been the overthrow of some long‐standing rulers like Ben Ali of Tunisia and Mubarak of Egypt, as well as the questioning of authoritarian regimes by the masses. The public protests submerged some Arab republics, but monarchies found ways to overcome the public outcry through containing the opposition. This paper, therefore, takes the monarchy of Morocco as a case study with the aim of analyzing the methods and regime‐survival strategies the regime has employed to sustain itself and consolidate power in the post‐2011 Arab uprisings era. Additionally, the role of the Justice and Development Party as an emerging threat in the postdemocratization era, and the changing nature of the party’s relations with the palace, will be addressed.  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