排序方式： 共有117条查询结果，搜索用时 15 毫秒
21.
本文分析了征收排污费、产权交易和排污权许可交易制度在解决区域性环境问题方面的优劣和自治理机制设计分析,结论是:排污权许可交易制度在解决相对封闭区域的环境污染问题方面是最优的,并且通过建立污染市场是能够有效运行的。 相似文献
22.
Jianxin Gong 《Geographical analysis》2002,34(2):155-167
For a set of geographical units in the Cartesian coordinate system, the locus of the standard deviation of the x coordinates of the set forms a closed curve as the system is rotated about the origin. This curve, often referred to as “standard deviational ellipse” (SDE), is not in fact an ellipse. The actual shape of the curve has remained unclear since the issue was mentioned initially by Lefever in 1926. In the present paper this closed curve, referred to as “standard deviation curve” (SDC), is clarified mathematically, and some of its applications in spatial analysis are discussed. The shape of SDC changes from a single circle to double circles when the distribution of the set of geographical units changes from an even condition to a straight line. The shape of SDC is determined explicitly by the ratio of its minor axis to its major axis. This ratio, therefore, is a useful index to show to what extent the distribution of a set of geographical units is circular, or linear. In addition, the size and radius of SDC can be used to indicate the distribution density of geographical units. The major axis of SDC, whose angle is determined explicitly for the first time, indicates the major orientation of geographical units. A program has been developed to apply SDC to spatial analysis (mean center, major orientation, distribution density, circular condition, etc.). The program is available from jx_gong@hotmail.com . It is written in the MapBasic language, and runs under MapInfo. 相似文献
23.
吴地山歌又称吴歌,其产生发展源远流长,流传区域早已不限于吴语地区。明代中晚期,是吴歌发展的极盛时期,冯梦龙就是这个时期最具影响力的代表人物。他以大量的精力从事吴歌俗曲的采集、整理、编辑、评点,刊印了《挂枝儿》《山歌》两本民歌专集,对我国的民间文学事业作出了重大的贡献。作为冯梦龙家乡和吴歌传唱中心的苏州,新中国成立以来,在吴歌的挖掘、研究方面做了大量工作。2006年,吴歌被列入首批国家非物质文化遗产保护名录。近几年来,随着冯梦龙文化研究的不断深入,在吴歌的保护与传承、创新与发展方面开展了一系列的活动,取得了一定成果,对于弘扬优秀传统文化,繁荣新时代文化事业具有十分重要的现实意义。 相似文献
24.
X‐L. Chen Y‐M. Fang Y‐W. Hu Y‐F. Hou P. Lü J. Yuan G‐D. Song B. T. Fuller M. P. Richards 《International Journal of Osteoarchaeology》2016,26(5):808-817
During the late Longshan period (ca. 4200–3900 BP) settlements on the Central Plains of China underwent a diversification in food production technologies, which set the stage for rapid economic and social development. The introduction of novel domesticates such as rice, wheat, cattle, and sheep not only provided more food choices, but also changed ideas concerning land use, farming techniques, and the use and mobilization of large scale labor forces. To better understand the contribution that these new dietary items and practices made to shaping the late Longshan period societies, a stable isotope ratio study of humans (n = 12) and animals (n = 42) was conducted at the late Longshan period site of Wadian. The human δ13C and δ15N values are clustered into two distinct groups. One group of nine individuals (δ13C = −9.9 ± 0.7‰; δ15N = 7.5 ± 0.5‰) had a predominately C4 diet based on millet grains with little protein input from the domestic animals. The other group of three individuals (δ13C = −14.3 ± 0.8‰; δ15N = 10.2 ± 0.3‰) had a mixed C3/C4 diet of millets and rice and were consuming sheep and cattle. The animals also displayed dietary diversity with the pigs (δ13C = −11.3 ± 2.5‰; δ15N = 6.9 ± 1.0‰, n = 10) and dogs (δ13C = −10.1 ± 1.0‰; δ15N = 7.2 ± 1.1‰, n = 7) having mostly a C4 plant based diet (millets). In contrast, the cattle (δ13C = −12.8 ± 2.1‰; δ15N = 7.6 ± 0.7‰, n = 9), sheep (δ13C = −16.7 ± 0.9‰; δ15N = 7.6 ± 0.1‰, n = 2), and cervids (δ13C = −20.8 ± 0.9‰; δ15N = 5.0 ± 1.2‰, n = 10) had diets with a greater contribution from C3 sources such as rice and wild plants. The discovery that humans and animals had different subsistence patterns indicates dietary complexity at Wadian and that rice agriculture, and cattle and sheep husbandry practices were already an important part of the local economy by the late Longshan period in the southern region of the Central Plains of China. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
25.
L. L. Dai Z. P. Li C. Q. Zhao J. Yuan L. L. Hou C. S. Wang B. T. Fuller Y. W. Hu 《International Journal of Osteoarchaeology》2016,26(5):885-896
Located in the Central Plains of China, the early Xia Dynasty site of Xinzhai (2050 BC–1750 BC) with large archaeological features and exquisite artifacts of jade and copper is pivotal for probing the origin and formation of Chinese civilisation. Here, stable isotope ratios analysis, supplemented by zooarchaeological results, was used to investigate the exploitation and management of animals utilised by humans. It was demonstrated that a diverse pattern of animal raising and exploitation was present at the Xinzhai site. The domestic pigs were fed with substantial amounts of millets or their byproducts to guarantee a food source for the dietary demands of the humans. Dogs were also found to have consumed large amounts of C4 protein sources, likely in the form of human food scraps or leftovers. The domestic herbivores, sheep and cattle, showed different dietary characteristics in that the former mainly grazed in the natural environment, while the latter species were fed with large amounts of C4 products. This intra‐species variation was somewhat related to their physiological characteristics but seems to have been more determined by their different status in social and ritual activities. Thus, this research at Xinzhai provides a glimpse of the organisation of animal resources during the initial formation of Chinese civilisation. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
26.
古遗址是重要的一种文化遗产形态,大遗址则是具有中国特色的一种与文化历史价值、行政管理、政府决策密切相关的保护对象。显然大遗址的价值判定和评估是这一特殊对象有效保护的基础。本文通过国内外评估体系的比较分析、国内资料、现状的调研分析,确立评估要素,进而结合价值评估体系构架的方法,对我国大遗址价值评估体系进行了初步研究。 相似文献
27.
氧化铁在钧瓷天蓝、天青系列釉色中的着色作用以及乳光蓝色问题,一直是学术界争论的焦点。本研究通过放大氧化铁含量的实验验证方法,通过SEM(scanning electron microscope-扫描电子显微镜)、EDS(Energy Dispersive Spectrometer-能谱仪)、XRD(X-ray diffraction-X射线衍射)等分析方法,重点研究了基础组成和分相结构对釉中氧化铁呈色的影响。同时,作者通过验证研究得出,钧瓷天蓝、天青系列釉色中,真正起呈色作用的是釉中的氧化铁等着色剂,第二相微粒散射呈色并非钧釉的普遍现象,或只是辅助呈色作用。 相似文献
28.
Duo Tian Jian Ma Jianxin Wang Thomas Pilgram Zhijun Zhao 《Environmental Archaeology》2018,23(4):416-425
ABSTRACTWe report an archaeobotanical analysis of flotation samples taken from Shirenzigou, an Early Iron Age agro-pastoralist site dated between the fourth and first century BC, located on the northern slope of the Tianshan Mountains in Xinjiang, China. The charred macro-botanical assemblage is dominated by naked barley grains with a few broomcorn and foxtail millet grains. In the context of Trans-Eurasian exchange of cereal crops, southwest Asian crops (wheat and barley) and two Asian millets (broomcorn and foxtail) were introduced to Xinjiang a few centuries to a millennium before Shirenzigou was occupied. The choice of barley cultivation in preference to wheat and millet may have been possibly driven by the relatively extreme local environment and the scheduling requirements of mobile pastoralism. Barley is well suited to this environment, and the choice of naked barley in preference to hulled barley may have been driven by the whole grain tradition prevailing in East Asia. 相似文献
29.
改革开放以来,中国特色社会主义事业总体布局在理论上经历了由经济建设、政治建设、文化建设三位一体的初步形成到逐步明确,再到经济建设、政治建设、文化建设、社会建设四位一体的渐进发展过程。在工作安排上,社会建设的具体内容一直不同程度地体现在总体布局之中,越来越为党和国家所重视。随着我国经济社会的发展,三位一体总体布局中社会建设具体内容的边缘性和模糊性,客观上要求突破总体布局原有的框架。四位一体总体布局是对我国社会主义初级阶段社会主要矛盾认识深化的必然结果,是应对社会变革和发展新特征的理论创新,是解决经济社会发展不协调问题的必然要求。 相似文献
30.
对多年来积累的气候资料的综合分析表明:在全新世期间有两个比较明显的温暖期。它们的时间分别为8～6kaBP(校正成日历年龄大约为9～7calkaBP)和5～3kaBP(日历年龄大约为5.5～3.2calkaBP)。文化的发展很大程度上受到了环境条件的制约。在前一个温暖期的后半段(8～7calkaBP),北方旱作农业(磁山文化、大地湾文化、兴隆洼文化)发展起来。南方稻作农业要在7.0～6.0calkaBP才初具规模。而6.0～5.5calkaBP的气候冷干事件使得南北方文化均有不同程度的衰退,但是南方受到的影响要小于北方。在后一个温暖期到来之后(5.5～3.2calkaBP),分别以龙山文化和良渚文化为代表的南北方新石器文化几乎同时进入发展史上的另一个黄金时代。尽管南北方文化体系对于气候变化的响应有所差异,并且不同时期不同地域文化发展动力也不尽相同,但是从大的时空尺度上来看,我国的新石器时代发展经历了如下阶段:最早期文化萌芽阶段(10calkaBP)——早中新石器时代之间的文化相对衰退期(10～8calkaBP)——新石器时代中期的北方农业文明崛起(8～7calkaBP)——7.0～6.0calkaBP的南方稻作农业的极大发展期——6.0～5.5calkaBP的文化衰退期——新石器时代晚期(5.5～4.0calkaBP)文化的极大繁荣。其间一些大的文化演替或者转型事件的时间在各地也大致相同。说明这种大的文化演进过程还是受到了同一个信号的支配,而只有环境气候因素才可能影响到如此大的范围。 相似文献