全文获取类型
| 收费全文 | 358篇 |
| 免费 | 10篇 |
专业分类
| 368篇 |
出版年
| 2023年 | 6篇 |
| 2021年 | 5篇 |
| 2020年 | 10篇 |
| 2019年 | 15篇 |
| 2018年 | 12篇 |
| 2017年 | 18篇 |
| 2016年 | 26篇 |
| 2015年 | 12篇 |
| 2014年 | 10篇 |
| 2013年 | 105篇 |
| 2012年 | 14篇 |
| 2011年 | 7篇 |
| 2010年 | 4篇 |
| 2009年 | 17篇 |
| 2008年 | 13篇 |
| 2007年 | 10篇 |
| 2006年 | 5篇 |
| 2005年 | 5篇 |
| 2004年 | 6篇 |
| 2003年 | 3篇 |
| 2002年 | 5篇 |
| 2001年 | 6篇 |
| 2000年 | 4篇 |
| 1999年 | 3篇 |
| 1998年 | 2篇 |
| 1997年 | 2篇 |
| 1996年 | 3篇 |
| 1993年 | 2篇 |
| 1990年 | 2篇 |
| 1988年 | 2篇 |
| 1981年 | 1篇 |
| 1980年 | 1篇 |
| 1979年 | 1篇 |
| 1978年 | 1篇 |
| 1977年 | 2篇 |
| 1976年 | 2篇 |
| 1975年 | 1篇 |
| 1972年 | 2篇 |
| 1971年 | 1篇 |
| 1970年 | 1篇 |
| 1967年 | 2篇 |
| 1965年 | 1篇 |
| 1959年 | 3篇 |
| 1955年 | 1篇 |
| 1954年 | 1篇 |
| 1953年 | 2篇 |
| 1952年 | 1篇 |
| 1951年 | 1篇 |
| 1948年 | 1篇 |
| 1947年 | 1篇 |
排序方式： 共有368条查询结果，搜索用时 15 毫秒
91.
Jeremy Black 《国际历史评论》2015,37(5):1110-1111
92.
93.
Alex Mermikides 《Interdisciplinary science reviews : ISR》2014,39(3):290-296
AbstractThis short article responds to two recent conferences on performance and science: the Splice Symposium (Chimera Network/University of Notre Dame) and Performing Science (University of Lincoln). Rather than a conventional conference report, the author reflects on a selection of presentations in the light of issue one of ISR’s ‘theatre and science’ series. 相似文献
94.
Successive attempts to reform planning practice in England have given rise to an impression that planning is “under attack”. Various academic commentaries have performed the valuable service of cataloguing aspects of this reform agenda, often within the context of the analytical framework offered by neoliberalization. In this paper, we seek to chronicle the cumulative effects of the sustained programme of neoliberalization to which urban and environmental planning has been subjected in England over a period spanning approximately the last 15 years. In doing so, we hope to show why planning has been such an intractable issue for all governments that have sought its reform irrespective of the particularities of their political agenda. 相似文献
95.
Jeremy Black 《国际历史评论》2013,35(3):582-583
This article examines the negotiations in the years 1945–7 between Soviet and Swedish diplomats over the Swedish diplomat Raoul Wallenberg, who was arrested by the Soviets in Budapest on 17 January 1945. As is clear from both Soviet and Swedish archival records, including the recently de-classified encrypted Soviet diplomatic cables, the nature of the communication about Wallenberg went through a number of shifts, dividing the years 1945–7 into three periods. Despite in-depth reviews of both the Soviet and Swedish Foreign Ministry archives, no instructions from the political leaderships of Sweden and the USSR explaining these shifts have been identified. Why is it that we can distinguish changing patterns of communication despite the absence of corresponding instructions from the leaders of the two states? This article argues that dynamics inherent to the diplomatic dialogue itself go a long way to explain the shifting communication patterns. In order to make the case viable as well as communicable, Soviet and Swedish diplomats, short of authoritative guidance, were bound to ascribe meaning and purpose to the behaviour of ‘the other’ on the basis of analogical reasoning founded on their experiences from parallel matters on the Soviet–Swedish agenda. 相似文献
96.
Eighteen taxa of Middle Devonian (Givetian) gastropods, including two new genera and five new species, are présent in the Tungkangling and Yingtang Formations, Wuxuan and Xiangxhou counties, Guangxi Province, China. Pingtianispira tuberculata gen. et sp. nov., Wuxuanella nodusa gen. et sp. nov. and Wuxuanella luifengshanensis sp. nov., Crenulazone wuxuanensis sp. nov. and Murchisonia luifengshanensis sp. nov. are erected from this distinct fauna. The fauna is dominated by nodose and unusual murchisonioids and has strong European and other Old World realm affinities. 相似文献
97.
Karen H. Black 《Alcheringa: An Australasian Journal of Paleontology》2013,37(4):471-492
A latest Permian (late Changhsingian) radiolarian fauna is recorded from the upper Talung Formation, Hushan, Nanjing, Jiangsu Province, South China. This fauna includes 24 species belonging to 16 genera; new species are Albaillella hushanensis, Copicyntroides stellatus and Trilonche crassus. The presence of the radiolarian fauna and its taxonomic composition reveal that the Eastern Qinling-Dabie deep sea, which was located along the northern margin of the northeastern Yangtze Basin, persisted at least until the end of the Palaeozoic and that the collision between the North China and South China plates had not occurred by the end of the Permian. 相似文献
98.
Spatial interaction models commonly use discrete zones to represent locations. The computational requirements of the models normally arise with the square of the number of zones or worse. For computationally intensive models, such as land use–transport interaction models and activity‐based models for city regions, this dependency of zone size is a long‐standing problem that has not disappeared even with increasing computation speed in PCs—it still forces modelers to compromise on the spatial resolution and extent of model coverage as well as on the rigor and depth of model‐based analysis. This article introduces a new type of discrete zone system, with the objective of reducing the time for estimating and applying spatial interaction models while maintaining their accuracy. The premise of the new system is that the appropriate size of destination zones depends on the distance to their origin zone: at short distances, spatial accuracy is important and destination zones must be small; at longer distances, knowing the precise location becomes less important and zones can be larger. The new method defines a specific zone map for every origin zone; each origin zone becomes the focus of its own map, surrounded by small zones nearby and large zones farther away. We present the theoretical formulation of the new method and test it with a model of commuting in England. The results of the new method are equivalent to those of the conventional model, despite reducing the number of zone pairs by 96% and the computation time by 70%. Los modelos de interacción espacial suelen utilizar zonas discretas para representar áreas o puntos de interés. Los requisitos computacionales de estos modelos normalmente aumentan a razón del número de zonas elevadas al cuadrado o más. Para modelos computacionalmente intensivos como los modelos de interacción entre uso de suelo y transporte y los modelos basados en actividades para ciudades‐región, el impacto del tamaño de la zona es un problema persistente no superado aun. Esta limitación persiste a pesar de los grandes avances en la velocidad de procesamiento en computadoras, pues obliga a los modeladores a hacer concesiones entre la resolución espacial y la extensión que abarca el modelo, así como en el rigor y profundidad del análisis. En este artículo se presenta un nuevo tipo de sistema de zonas discretas que: a) tienen como objetivo reducir el tiempo de estimación de la aplicación de modelos de interacción espacial; y b) al mismo tiempo mantienen su nivel de precisión. La premisa que gobierna este nuevo sistema es que el tamaño apropiado de las zonas de destino depende de la distancia a su zona de origen: a distancias cortas, la precisión espacial es importante y las zonas de destino deben ser pequeño; a distancias mas largas, conocer la ubicación precisa es progresivamente menos importante y las zonas pueden ser mayores. El nuevo método define un mapa específico de zonas para cada zona de origen; cada zona de origen se convierte en el foco de su propio mapa, rodeada de zonas cercanas pequeñas y zonas grandes a mayor distancia. El estudio presenta la formulación teórica del nuevo método y su demostración vía un modelo de desplazamientos residencia‐trabajo en Inglaterra. Los resultados del nuevo método son equivalentes a las del modelo convencional, a pesar de reducir del número de pares de zonas en un 96% y el tiempo de cálculo en un 70%. 空间相互作用模型通常采用离散区域代表区位。模型的计算量往往与区域数量呈平方甚至更高阶增长。对于可计算的精细模型,如土地利用‐交通相互作用模型和基于行为的城市区域模型,区域尺度的依赖性是长期存在的问题,即使计算机的计算速度增加,该问题仍无法消除。因此,建模者需在模型空间分辨率和覆盖范围以及模型分析的严谨性和深度上做出权衡。本文介绍了一种新型的离散分区系统,目的在于减少空间相互作用模型估算和计算时间,同时维持其精度。新系统的前提是目标区域的适当尺度取决于与初始区域的距离：在短距离范围内,空间精确性是重要的,且目标区域必须是小的;在更远距离上,位置精度的重要性降低,目标区域可以变大。该方法为每个初始区域制定了具体的尺度地图。每个初始区域成为其自身地图的中心,被近邻的小区域和更远距离的大区域所包围。本文给出了新方法的理论公式,并以英格兰地区的通勤模型进行检验。结果显示,尽管区域对的数量减少了96%,计算时间缩短了70%,但新方法的计算结果等效于常规模型。 相似文献
99.
100.
In this paper, we seek to revisit earlier work on the theory of rent, situating it in the current period of economic crisis and in relation to informal housing in the global South. More than ever, land is treated as a pure financial asset. Finance capital now exerts a profound influence over the production of space and exposes the built environment to the kinds of speculative binges that we have witnessed over the last decade. This is now as much a feature of living conditions in the poorest settlements of the global South as it is in the financial heartlands of the global North. We question key assumptions behind development interventions by arguing that infrastructural upgrading may decrease the security of tenure of residents of informal housing and call for a more nuanced approach that recognises the (post)colonial histories of urbanisation structuring access to land and housing. 相似文献