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排序方式: 共有193条查询结果,搜索用时 593 毫秒
71.
赛前运动员易产生紧张、焦虑等心理压力,分析其原因并提出了几种有针对性的调节方法.目的在于能使运动员在赛前达到最佳竞技状态. 相似文献
72.
利用取芯资料及密井网测井资料,在等时地层格架的基础上,精细描述了胜坨油田胜利村断背斜油藏沙二段81 层储层特征及油水分布规律,利用非均质油藏成藏动力与成藏阻力之间的力学平衡关系,探讨了断背斜油藏中油水界面差异分布的成因机理。研究表明,断背斜油藏同一沉积单元中,各含油断块在油柱高度和油水界面深度方面存在较大差异,同一含油断块内部的油水界面与构造线并不完全平行。储层物性更差、构造更平缓、原油密度更大的断块和区域具有更高的油柱高度,从而导致了油水界面的差异分布。在实际油藏中,油柱高度存在的断块间差异和断块内差异是非均质储层油水界面分布的普遍特点,但具体油水分布状态要受储层非均质性、构造趋势、原油性质等因素的叠加影响。 相似文献
73.
袁国容 《西北第二民族学院学报》2003,2(1):17-23
清末 ,张之洞在海南面临外国列强威胁和黎族人民不停打击清政府统治的背景下 ,对海南进行了大规模的镇抚和开发 ,并取得一些成效 ,推动了海南黎族人民的进步。其全方位的开发政策为我们今天发展少数民族经济 ,促进民族共同发展以及民族团结提供了宝贵的经验 相似文献
74.
The Habermasian public sphere: Taking difference seriously? 总被引:1,自引:0,他引:1
Lincoln Dahlberg 《Theory and Society》2005,34(2):111-136
The public sphere conception continues to hold center stage in debates and visions of radical democratic society, and Jürgen Habermas work continues to be the most popular starting point for developing this conception. However, the Habermasian public sphere has also come under powerful and sustained criticism from many quarters. Here I concentrate upon the critiques of a group of theorists to whom I refer as difference democrats. I examine the three key arguments of these critics:that the public sphere conception involves the exclusion of aesthetic-affective modes of communication and hence the voices of certain groups; that it assumes that power can be separated from public discourse, which masks exclusion and domination; and that it promotes consensus as the purpose of deliberation, which marginalizes voices that do not readily agree. Against these claims I show that the Habermasian public sphere can be read as maximizing the inclusion of difference in deliberative exchange. I demonstrate how the conception extensively accommodates aesthetic-affective modes of discourse, how it accounts for both negative and positive forms of power in discourse, and how it promotes the process over the end-point of rational discourse in public opinion formation. 相似文献
75.
Per-Åke Rosvall 《Intercultural Education》2017,28(6):523-542
There is little research into the career trajectories and occupational aspirations of rural youth with immigrant backgrounds in Europe. This article presents new research based on field observations and interviews with five young immigrants of Persian descent in one rural town in Sweden. The findings highlighted gender differences in how the research participants felt their immigrant background would shape their future career plans and aspirations. The boys anticipated that by staying in the local town they might experience less of the stigma that they knew immigrants in urban areas often face. In contrast, the girls did not think of their rural home town as the best place to establish a career. One of the girls also spoke of an ambition to divide her working life between her new homeland and her family’s country of origin. The analysis stresses the importance of an intercultural understanding of both the local and the global when counselling immigrant youth in rural areas regarding their career choices. 相似文献
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kland Olav Skarpaas Martin Schroeder Christer Magnusson ke Lindelw Karl Thunes 《Risk analysis》2010,30(9):1424-1439
The pinewood nematode (PWN) is one of the worst tree‐killing exotic pests in East‐Asian countries. The first European record of establishment in Portugal in 1999 triggered extensive surveys and contingency plans for eradication in European countries, including immediate removal of large areas of conifer host trees. Using Norway as an example, we applied a simulation model to evaluate the chance of successful eradication of a hypothetical introduction by the current contingency plan in a northern area where wilting symptoms are not expected to occur. Despite a highly variable spread of nematode infestations in space and time, the probability of successful eradication in 20 years was consistently low (mean 0.035, SE 0.02). The low success did not change significantly by varying the biological parameters in sensitivity analyses (SA), probably due to the late detection of infestations by the survey (mean 14.3 years). SA revealed a strong influence of management parameters. However, a high probability of eradication required unrealistic measures: achieving an eradication probability of 0.99 in 20 years required 10,000 survey samples per year and a host tree removal radius of 8,000 m around each detection point. 相似文献