全文获取类型
收费全文 | 208篇 |
免费 | 9篇 |
专业分类
217篇 |
出版年
2023年 | 4篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 10篇 |
2018年 | 13篇 |
2017年 | 18篇 |
2016年 | 10篇 |
2015年 | 8篇 |
2014年 | 10篇 |
2013年 | 32篇 |
2012年 | 9篇 |
2011年 | 12篇 |
2010年 | 8篇 |
2009年 | 5篇 |
2008年 | 14篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 6篇 |
2004年 | 1篇 |
2003年 | 3篇 |
2002年 | 3篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 2篇 |
1991年 | 3篇 |
1990年 | 1篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1977年 | 2篇 |
1968年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有217条查询结果,搜索用时 15 毫秒
61.
Robert R. Sokal Neal L. Oden Barbara A. Thomson Junhyong Kim 《Geographical analysis》1993,25(3):199-210
Tests for differences among regional means are typically carried out by analysis of variance (ANOVA). When such data are spatially autocorrelated (SA), the assumptions of ANOVA are not met, giving rise to excessive type I error rates. Two spatially adjusted ANOVA methods, Griffith's and COCOPAN, have been proposed to overcome this problem. In this study we show, by means of extensive simulations, the magnitude of the error rates introduced by SA induced in isolation-by-distance models typical of those used in population genetics. For data suspected of exhibiting such SA, we propose a strategy for distinguishing between inherent SA, generated within the data by a contagious process, and spurious SA, introduced by regional differences in means. The approach adopted is that of restricted randomization of distance matrices. We also furnish error rates and power estimates for both Griffith's method and COCOPAN. In addition to the simulated data, the methods are applied to an actual example from plant population biology. 相似文献
62.
63.
As a major contributor to local economies, the tourism industry has been greatly impacted by natural disasters. This study demonstrates the association between tourism economies and impacts of hurricanes in the southeastern United States containing coastal national parks, known for attracting a large number of tourists and having experienced hurricanes. In keeping with two longitudinal data methods (i.e. panel logit model and autoregressive integrated moving average), this study focused on the relationship between the (1) duration, intensity, and damage of hurricanes; (2) existing climate conditions; and (3) tourism demand on park visitation during hurricane and tourism seasons. As a whole, the impacts of hurricanes and climate conditions (precipitation, temperature) were found to have a negative effect on tourism demands (park visitation). With regard to the response of tourism economies to natural disaster damage, parks that experienced stronger natural disasters may be closed for a longer period in order to reconstruct facilities or natural/cultural resources damaged by storms. In an attempt to improve tourism-based regional economies, overcome the challenge of natural disasters on tourism economies, and increase opportunities for establishing disaster management, it is necessary to make an effort to allay unexpected damage to tourism-based areas through proactive plans for disaster mitigation activities. 相似文献
64.
Former Prime Minister Iyad Allawi stunned the Iraqi and American political establishment with his comeback success in Iraq's 2010 election. Speculation immediately began to focus on how his coalition could have won the most seats, focusing on disaffection with the status quo. But the answer could come from a tactic Allawi has repeatedly used: tying his domestic political opponents to countries that Iraq has clashed with in the past, to reignite old hatreds and fears. This article investigates, not only how Allawi and even his rivals have adopted such a strategy, but also how our current understanding of the diversionary theory of conflict needs to be modified to see how politicians in other places play this wag the dog game. 相似文献
65.
Massive protests shook South Korea through the summer of 2008. This political eruption which exhibited many novel and unexpected elements cannot be explained by pointing to basic political conditions in South Korea (strong labor unions, democratization, and so forth). Neither does the putative reason for them – to protest the new President’s decision to reopen South Korea’s beef market to the U.S. – adequately explain the social dynamics at play. In this paper, we examine the political geography of the ‘candlelight protests’ (as they came to be known), focusing in particular on their novel aspects: the subjectivities of the protesters, fierce ideological struggles, and differentiated geography. We argue that the deepening of neoliberal restructuring by the new conservative regime formed the underlying causes of these intense conflicts. In other words, the new protests should be seen as a response to the reinforced contradictions engendered by neoliberalization and a new alignment of social groups against the prevailing hegemonic conditions in South Korea. In this view, the huge demonstrations revealed vulnerabilities in conservative hegemony but failed to produce a different hegemony. To advance these claims, we examine three aspects of the protests: first, the neoliberal policies of the new conservative regime; second, the intense ideological conflicts around the media; and finally, the spatial materialization of the protests. 相似文献
66.
As the Covid-19 pandemic continues to unfold around the world, governments engage in diverse decision-making processes that shape everyday living patterns, rituals and livelihoods. This article compares and examines state-level governmental influences on the social construction of the Covid-19 disaster in the United States, specifically analyzing the states of Ohio and Georgia. The authors interrogate how governing bodies and officials in these states differentially construct the crisis and reshape social norms during periods of liminality. 相似文献
67.
Kim B. Östman 《Scandinavian journal of history》2013,38(3):268-289
This article explores the reactions of civil authorities and Lutheran clergy to Mormon activity in Finland between the years 1875 and 1889. At this time, Mormonism was introduced to the country by missionaries who were mainly Swedish natives and who proselytized in the Swedish-speaking coastal areas. Although the impact was numerically small in terms of conversions, the Mormon presence was regarded by the civil authorities and the Lutheran clergy as sufficiently serious to warrant action. Civil authorities responded for example by confiscating Mormon literature and issuing warnings and threats of arrest to missionaries. Clergy, acting from a religious perspective and seeking to impede the spread of new religious movements that they regarded as spiritually harmful, interrupted preaching meetings and warned their parishioners against the perceived heresy. Enforced legislation and strong societal opposition was an important reason for the meagre harvest of Mormon converts in 19th-century Finland as opposed to the other Nordic countries. 相似文献
68.
69.
Anna Fedrigo Markus Strobl Alan R. Williams Kim Lefmann Poul Erik Lindelof Lars Jørgensen Peter Pentz Dominik Bausenwein Burkard Schillinger Anton Kovyakh Francesco Grazzi 《Archaeological and Anthropological Sciences》2018,10(6):1249-1263
We present novel imaging results from a non-invasive examination of three ‘pattern-welded’ swords from the Viking Age belonging to the National Museum of Denmark, using white beam and energy resolved tomographies with neutrons. Pattern-welded blades are made by forge welding together thin strips of iron and steel that were twisted and joined in various ways, producing a decorative pattern on the surface. The study shed light on the inner structure of the composite material and manufacturing techniques of these admired examples of past technology, revealing some otherwise invisible details of their assembly methods, phase distribution and extent of the corrosion. 相似文献
70.
Industry Characteristics Linked to Establishment Concentrations in Nonmetropolitan Areas 总被引:4,自引:0,他引:4
In this paper we investigate industry characteristics associated with the clustering of establishments in three-digit SIC manufacturing industries in nonmetropolitan areas. The dispersion parameter k of the negative binomial distribution is selected as the measure of industry spatial concentration. Associations between industry characteristics and spatial concentration are investigated using OLS regression analysis. Our findings indicate that the spatial clustering of establishments is positively related to industry average establishment size, reliance on natural resource inputs, labor intensity, cost shares of professional and technical employees, and cost shares of low-skilled workers. Agglomeration is negatively related to multiplant structure, employment in precision production, and reliance on local product and input markets. 相似文献