全文获取类型
收费全文 | 453篇 |
免费 | 5篇 |
出版年
2024年 | 3篇 |
2023年 | 1篇 |
2022年 | 12篇 |
2021年 | 6篇 |
2020年 | 14篇 |
2019年 | 12篇 |
2018年 | 11篇 |
2017年 | 6篇 |
2016年 | 21篇 |
2015年 | 7篇 |
2014年 | 8篇 |
2013年 | 29篇 |
2012年 | 27篇 |
2011年 | 35篇 |
2010年 | 22篇 |
2009年 | 25篇 |
2008年 | 23篇 |
2007年 | 23篇 |
2006年 | 36篇 |
2005年 | 31篇 |
2004年 | 25篇 |
2003年 | 17篇 |
2002年 | 22篇 |
2001年 | 10篇 |
2000年 | 13篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 2篇 |
1991年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有458条查询结果,搜索用时 634 毫秒
81.
空港经济产业布局模式及规划引导研究——以广州白云国际机场为例 总被引:6,自引:0,他引:6
从产业布局的角度探讨了国内近年比较热门的空港经济现象。首先从与机场最直接相关的人、物、资金和信息四大要素入手,剖析了空港经济主要产业类型及其特征,并分析了空港经济总体区位及其演变过程。在此基础上总结分析空港经济产业具有与发展阶段相吻合的增长极、点轴和网络三种布局模式,指出国内备受推崇的圈层布局是发展阶段不明确的理想模式,并尝试采用地理信息系统空间分析方法对产业布局的区位进行叠加分析。最后以广州新白云机场为例,探讨了周围花都区和白云区空港经济产业布局规划方案和措施。 相似文献
82.
83.
As sites of climatic impacts, cities have become key players in climate policy-making in order to reduce GHG emissions and vulnerabilities of settlements. They started taking actions in various fields such as built environment, water and waste management, transportation and urban greenery. However, the involvement of cities in climate policy-making varies over countries and regions; the extent of involvement differentiates even among the cities of the same country. This paper focuses on the Turkish case and elaborates the current status of climate policy-making in Turkish metropolitan cities. It aims at identifying achievements at the local level and pointing to challenges for an effective local climate action, which can be helpful for other contexts, too. Having conducted both desk-based and questionnaire surveys, it examines and categorizes climate-related actions in metropolitan municipalities, and highlights varying levels of achievements in terms of sectors and innovativeness. The study concludes with analysing the motives behind varying achievements of municipalities as well as the main challenges for local action and discussing policy implications to overcome them. 相似文献
84.
Heather MacDonald 《Geographical Research》2018,56(2):230-240
This paper investigates the complex and continuously evolving processes of de‐democratisation evident in urban planning practice in Sydney between 2011 and 2017. New South Wales' successive rounds of planning reform, establishment of a metropolitan commission, and amalgamation of local governments over that period have aimed to reduce local democratic participation in planning decisions, but they have had uneven success. I argue that while New South Wales' efforts to streamline development and de‐democratise planning have evolved considerably in response to multiple forms of opposition, the success of the neoliberal project is still uncertain. The insights this story offers add complexity to theorists' claims about the inevitability of depoliticisation and the end of meaningful democratic engagement. The story also offers insights about how power is created, lost, and regained in particular local circumstances. 相似文献
85.
国家级新区的空间生产与治理尺度建构 总被引:2,自引:0,他引:2
国家级新区是近年来备受瞩目的新国家空间类型。首先,论文从新国家空间的理论视角出发,认为国家级新区是我国新时期国家空间选择偏好从城市内部空间转变为城市群体空间的产物,是国家为参与全球城市竞争和承接全球产业转移而在城市-区域尺度上构建的新地域组织。其次,论文研究了国家级新区的空间生产,发现其在微观尺度上具有多尺度行政区跨界联合的特征,并且表现出自上而下和自下而上相结合的机制。然后,基于空间生产与尺度重组的密切联系,论文同时研究了国家级新区治理建构的情况。通过分析不同类型的国家级新区空间治理结构,发现影响国家级新区尺度重组进程的关键因素,是新尺度与原有行政区划的耦合程度。最后,在上述研究的基础上,论文对国家级新区未来治理改革提出了政策建议。 相似文献
86.
为探究滇西地区青铜文化及相关铜器的制作技术,本研究使用便携式X射线荧光光谱(p XRF)对滇西祥云县大波那墓地、检村石棺墓和红土坡古墓群出土357件铜器进行了成分分析。结果表明,p XRF可在无损、原位的情况下,基本做到铜器合金成分的定量分析。铜器材质均以红铜和锡青铜为主,铅锡青铜和砷铜居少量。三处墓地铜器Sn、Pb配比模式高度一致。铜矛、铜剑等兵器中出现少量高锡青铜。这些现象反映出祥云地区各时期铜器的制作工艺高度一致,可称之为昆明夷铜器工艺类型。大波那墓地铜器基本不含铁,其余墓地存在较多高铁铜器,大波那地区的先民应该采用了不同的冶炼技术。砷铜全部出自红土坡古墓群,初步推测晚期墓葬出现的砷铜乃至砷铜工艺很可能是沿着"半月形文化传播带"由西北地区传入祥云地区的。 相似文献
87.
Testing Area‐Scale Fractal Complexity (Asfc) and Laser Scanning Confocal Microscopy (LSCM) to Document and Discriminate Microwear on Experimental Quartzite Scrapers
下载免费PDF全文
![点击此处可从《Archaeometry》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Few microwear studies have been conducted on tools made from quartzite. Most rely on visual observation of microwear features using optical light microscopes and scanning electron microscopes. Quantification of microwear on quartzite tools is extremely rare, even though numerous methods to mathematically document surface roughness have been applied to other silicate tools. In this paper, laser scanning confocal microscopy (LSCM) was used to document surface roughness on four experimental scrapers made from two different subtypes of Mistassini quartzite that were used on either fresh or dry deer hide. Surface roughness data were analysed using area‐scale fractal complexity (Asfc). The results of this test case indicate that Asfc can effectively discriminate between the unused and used regions on the quartzite tools based on surface roughness, and that it can also discriminate between surface roughness produced by working dry versus fresh hides. Differences in the subtypes of Mistassini quartzite did affect surface roughness, but not significantly enough to prevent discrimination of the dry and fresh hide‐working tools. Although the use of the Asfc parameter for lithic microwear analysis requires further testing, these first results suggest it could be a reliable technique to mathematically document and discriminate wear patterns on archaeological quartzite tools. 相似文献
88.
Helaine Silverman 《Journal of World Prehistory》1996,10(2):95-146
Previous and current fieldwork has generated a significant body of data on the occupation of the south coast of Peru during the Formative Period (ca. 3800-2200 B.P.). These data are placed in a synthetic framework and evaluated and compared to the trajectory of cultural development in the better studied regions of the Central Andes. Critical review of this panorama necessitates consideration of the relative chronological framework and definition of the Formative Period, the parameters and validity of the south coast as a culture area, contacts south coast societies sustained with other Central Andean regions, and the role of monumental architecture in the rise of complex society. 相似文献
89.
90.
目前基于光谱成像的彩绘文物分析主要集中在颜料分析、信息增强、隐含信息挖掘等方面,分析方法主要采用遥感图像处理软件。针对文物数据专门分析方法研究尚显不足的问题,提出基于光谱成像的彩绘文物新应用与新方法。主要包括基于最小噪声分离(MNF)变换感知修复区域的新应用,利用感兴趣区域分析与融合挖掘彩绘文物隐含信息以及基于稀疏非负矩阵欠近似彩绘文物线稿提取的新方法。通过在唐墓壁画、彩绘泥塑以及手绘绢画上的实验,发现光谱成像可以有效感知修复区域,提出的新方法可以有效挖掘隐含信息以及提取线稿,对基于光谱成像的彩绘文物分析研究具有重要意义。 相似文献