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   20篇
  免费   0篇
  国内免费   1篇
地质学   8篇
综合类   3篇
自然地理   10篇
  2021年   1篇
  2019年   1篇
  2017年   1篇
  2015年   1篇
  2013年   3篇
  2009年   1篇
  2008年   2篇
  2006年   1篇
  2005年   2篇
  2004年   1篇
  2002年   3篇
  2000年   2篇
  1998年   1篇
  1996年   1篇
排序方式: 共有21条查询结果,搜索用时 375 毫秒
1.
This essay is a revision of a paper prepared for an NSF workshop on race and geography. Participants in the workshop were asked to offer their views on the topic and our suggestions for further research. This contribution explores some aspects of the relationship and relevance of geography to the question of race in North America. It touches on three “places” that constitute the discipline: the place of research, the place of teaching, and the workplace. With respect to research, it suggests some promising lines of inquiry. Among these are studies of the relationship of scale to the politics of identity and studies of “passing” in connection with studies of geographies of experience and geographies of power.  相似文献   
2.
Abstract: In this paper I examine the intentional act of transforming the colour of one's skin – sun‐tanning – by Pākehā at three New Zealand beaches: Papamoa, Mount Maunganui, and Takapuna. Recent debates about the construction of whiteness are outlined before discussing the historical significance of beaches and sun to New Zealand's leisure culture. This paper seeks to de‐naturalize whiteness through the disclosure of gendered leisure practices of tanning. Empirical material reveals that Pākehā, who actively seek brown skin, negotiate a number of racialized and gendered ‘truths’ as their sun‐tan transforms their bodies. I conclude by arguing that geographers need to be more attentive to the ways in which place constructs particular forms of gendered whiteness.  相似文献   
3.
重质碳酸钙的白度和色相值(Lab)是最重要的工业指标,但影响因素尚不清楚。本文通过扫描电镜、粉晶X射线衍射(XRD)和电感耦合等离子体发射光谱(ICP-OES)等分析手段,对浙江衢州上方镇的重钙方解矿石进行了研究,以期阐明重质碳酸钙白度和色相的影响因素。结果表明,矿石随研磨粒度的减小白度逐渐增加,在100~400目,白度呈快速上升趋势,超过400目,白度的上升趋势减缓,直至几乎不变。相较于青相矿石,红相矿石的方解石结晶程度高、颗粒大且均匀,杂质较少,化学成分较纯。而Fe3+含量与重钙产品白度和L值呈负相关,与a、b值呈正相关关系。综合研究认为,致色元素(Fe)含量的高低和原矿石的杂质含量、结晶程度均可能为重钙色相差异的主要原因,建议在方解石矿工业勘查中将白度指标测试的粒径统一为400目(38μm)。  相似文献   
4.
ABSTRACT. In an effort to provide a more complex and multifaceted understanding of the process of spatial assimilation, this article explores alternative paths in understanding racial/ ethnic minority residential patterns. It scrutinizes patterns of contemporary Asian Indian and Chinese settlement in two metropolitan areas: Austin, Texas and Phoenix, Arizona. Though not particularly evolved in terms of their Asian immigrant settlement or dynamics, Austin and Phoenix represent the growing number of newly emergent Asian centers throughout the nation that have developed with the rapid rise of immigration from these two countries in the past several decades. The analysis utilizes records from the 2000 census to document and map Asian Indian and Chinese settlement within each metropolitan area and to investigate whether‐and to what degree‐each group is clustered or dispersed. The article then raises important questions about the consequences of concentration and dispersal for the incorporation of Asian Indian and Chinese residents.  相似文献   
5.
The intent of this paper is to explore how ‘reel’ and ‘real’ landscapes can be rendered dialectic. The analysis focuses on the filming of Tarzan's Secret Treasure (1941) at the wildlife preserve of Wakulla Springs in Florida, which was administered by the financial tycoon Ed Ball. Using Mitchell's recent commentaries on ‘good’ and ‘bad’ dialectics as our entry point, we offer two readings of this cinematic process. The first renders the on and off screen Wakulla Springs as ideological fodder, serving to valorise capital, masculinity and whiteness. The second reading addresses how this place has been actively constructed from discourses pertaining to class, gender and race, such that Wakulla exists as a series of fully relational spaces within diverse contexts, both ‘real’ and ‘reel’. In structuring our analysis in this manner, we hope to make clear why it does indeed matter for film geographers to acknowledge the conceptual presumptions brought to bear in the framing of the real and the reel as objects of analysis. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   
6.
陕西洛川黄土剖面的白度参数及其古气候意义   总被引:6,自引:0,他引:6  
陈Yang  鹿化煜 《地质论评》2002,48(1):38-43
对陕西洛川黄土剖面的白度研究表明,黄土和古土壤存在明显的白度差别,表现为黄土的白度值较高,而古土壤的白度值较低,依据白度值可以清晰地区另出剖面中的黄土层和古土壤层。化学处理以及分粒级实验结果表明风化成壤作用造成细粒级铁氧化物的含量增高是古土壤中白度值降低的主要因素。洛川剖面白度值的变化与第四纪冰期-间冰期旋回的波动特征相一致,其逐渐增高的趋势与全球气候变冷总体趋势相吻合,表明白度在反映夏季风环流强度变化,以及对全球气候变化的响应问题上具有广泛的应用前景。  相似文献   
7.
康震野 《吉林地质》2000,19(4):63-70
吉林省地质矿信息中心与白山市八道江区煤管局合作,对山地区石炭、二叠系煤系地层中的硬质高岭(土)岩进行了实验室加工试验,得出了影响砟子煤矿区硬质高岭(土)岩煅烧高岭土白度的六大因素,指出了煅烧工艺对砟子煤矿区硬质高岭(土)岩的关键所在,但各因素之间又是相关连,相互渗透的,对下一步建厂生产指明了方向,清楚地论述了应用砟子煤矿区硬质高岭(土)岩的煅烧加工过程,获得超细双90型造纸涂料级产品的把握所在,双90型产品指的是:粒度-2μm〉90%,白度(GE高度)〉90度。  相似文献   
8.
The importance of commemorative place-naming has been the focus of numerous studies that explore the relationship between memory and political representation. Few studies, however, have systematically examined regional geographical patterns of racial minorities in the United States. Using a variety of Internet-based mapping tools, I have collected a data set on the regional variation of the commemoration of thirty famous African-Americans (fifteen men and fifteen women). The research presented here explores how there are regional characteristics associated with where African-Americans are commemorated, particularly pertaining to cities. I also explore the geographic dispersal of these commemorations and whether there is a gender bias in the process of commemoration. Additionally, I focus on the duality of commemorations as an index of both African-American and the dominant white power structures.  相似文献   
9.
'Here we go again': Christchurch's antiracism rally as a discursive crisis   总被引:1,自引:1,他引:0  
Abstract:   An antiracist rally in Christchurch, New Zealand in May 2004 was organized by Asian immigrants to protest and advocate for an end to everyday racism in their dealings with long settled New Zealanders, but public debate focused not on the experiences of recent migrants but on the question of whether Christchurch is racist. A discursive crisis, indicated by heavy media coverage in the weeks immediately before and after the event, is characterized by discourses of denial, affront and whiteness that indicate the social context in which racialization occurs. Such discourses are similar to those of 'new racism' in other immigrant societies.  相似文献   
10.
To make use of the pelagic clay as polymer filling, the properties of clay sediments from the ocean investigation zone of China in the East Pacific were studied by the SSA, XRF, ICP/MAS, FHR, XRD, SEM, DTA/TG and granularity distributing etc. , and experiments were settled to improve the whiteness and activation of the clay based on these data. Compared with land clay, pelagic clay holds many particular features, such as fine particles and incompact accumulation, worse crystallization and more defects, high activity, complex mineral and chemical components, and low whiteness etc. Processing the purified pelagic clay with acids and zinc, then baked it at different temperatures, the whiteness of clay can be increased from 23.8% to 73.1%, and the optimized conditions is : consistency of vitriol 25%, ratio of clay to water 4:1, reaction time 4h, reaction temperature 90℃, dosage of zinc 2.0 g/L, and baking temperature 700℃. And the SSA of whited clay is increased too. Using the dry milling method to modify the pelagic clay with organic reagents, the optimized technique is KH550, concentration 1.5%, reaction time 20 min. XRD,FTIR and SEM testing indicate that the mechanism of organic activation was mainly surface absorbing and chemical combination secondly.  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