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Search Results: 1 - 10 of 78834 matches for " 郑芳 "
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多层次建设用地集约评价指标体系初探
The Study on the Intensive Evaluation Index System of Multi-Level Construction Land
 [PDF]

, 新奇
Urbanization and Land Use (ULU) , 2014, DOI: 10.12677/ULU.2014.22005
Abstract:

科学合理的评价指标体系是土地集约评价的核心,目前的研究多是关于区域建设用地、城市用地、开发区用地等方面的单体评价指标体系,这些指标体系之间的异同需要进行研究。本文采用文献资料归纳和比较分析法,探讨单体评价指标体系间的一致性与差异性,构建了区域–城市–开发区–高校教育用地–农村居民点的多层次建设用地集约评价指标体系,完善了集约用地评价指标结构层。结果表明,各单体评价指标体系在内涵表达、评价指标的设定和指标体系的设计上存有共性因素;并创新性地提出了多层次评价指标体系的构建思路及核心指标体系。
The science-reasonable evaluation index system has been regarded as the core of land intensive assessment, and the relative studies mainly focused on monomer evaluation index system, including region-based construction land, urban construction land and development zones and so on. Differences between them needed to be studied. Methods employed included documentation and comparative analysis. By analyzing and comparing similarities and the differences between the monomer evaluation index systems, the paper put forward the ideas of constructing multi- level evaluation index system, including region, urban, development zones, education land of colleges and rural housing, which could improve the evaluation index structure layer. The conclusions had two aspects: firstly, significant similarities were presented in the aspect of connotation expression, selection of evaluation index and design of index system; secondly, the paper innovatively put forward the ideas for construction of multi-level evaluation index system and the core indicators system.

黑荆树扦插繁殖成功

林业科学研究 , 1993,
Abstract: 黑荆树(Acacia mearnsii)是扦插难生根的树种之一,近年来我组从1~4年的母树上采集当年生枝条。在全光喷雾的条件下,开展了不同母树年龄,不同激素种类、激素浓度和处理时间,不同扦插基质内容的系列试验,现已筛选出最佳激素及
青霉素联合注射用清开灵(冻干)治疗急性呼吸道感染疗效观察

中国中医药信息杂志 , 2007,
Abstract:
带充电设施的电动班车路径规划问题研究
Research on Electric Shuttle Bus Routing Problem with Recharging Station
 [PDF]

, 贾永基, 蒋琦,
Management Science and Engineering (MSE) , 2016, DOI: 10.12677/MSE.2016.54016
Abstract: 针对公司班车运行的实际情况,考虑电动班车续航能力有限、客户预约服务时间窗不同等因素,构建了带充电设施的电动班车路径规划问题的混合整数规划模型,该模型可以提高电动班车运行的准时性,并提高其使用效率。然后,提出了求解该模型的遗传算法,测试结果表明,本文提出的算法是有效的。
According to the actual situation of company shuttle bus, considering the limited range of electric shuttle bus and the different customers’ reservation time windows, a mixed integer programming model for the electric shuttle bus routing problem with recharging station is constructed. By this model, the operation time and the utilization efficiency of the electric shuttle bus are improved. Then, a genetic algorithm is proposed to solve this model, and test results demonstrate that the algorithm proposed in this paper is efficient.
近年来国际可持续旅游研究及对我国的启示
Trends Analysis of International Sustainable Tourism Research and the Enlightenment to China
 [PDF]

, 侯迎, 苏贤保
Sustainable Development (SD) , 2016, DOI: 10.12677/SD.2016.64032
Abstract:
基于2008~2014年国际相关期刊与著作的可持续旅游研究成果,结合国外学者对该领域总结的经验,利用文献计量及对比分析法从旅游方式、研究内容、理论与方法进展等方面分析了国际可持续旅游研究态势。结果显示:研究的旅游方式多样化,对文化/遗产旅游及替代性旅游的研究逐渐增多,城市旅游方面关注较少,其它旅游方式仍属重点关注对象;研究主题较多,且出现了一些特别关注的主题,如旅游治理、碳主题(碳排放、碳中和、低碳等)、脆弱性及恢复力、公平公正等;理论与方法上实现了多学科融合,总体上定量化研究仍需加强。国内可持续旅游研究还需要提升,如关注替代性旅游方式较少,需今后扩展研究;主题内容不够细化,需从细处着手;实践层面需强化;研究理论与方法方面国际国内研究需相互借鉴。
This paper reviews a content analysis of studies published in 2008-2014 in Journal of Sustainable Tourism and some other relative journals and books, and makes comparison of experts’ experience in this field. Forms of tourism, subject themes, and methodology are studied. The results are: forms of tourism are variant, and studies on cultural tourism/heritage tourism and alternative tourism are increasing, but urban tourism is still lack of focusing. Subject themes are of great variety and some new themes have emerged such as tourism governance, carbon studies, vulnerability and resilience and justice. Multidisciplinary integration is prominent in theory and methodology fields but it still needs to strengthen quantitative research. Domestic research should be improved in these fields, such as forms of tourism especially in alternative tourism; themes should be more detailed and sustainable tourism practice should be improved. Besides, theory and methodology should be learnt from each other.
钙通道与钙释放通道

生物物理学报 , 1992,
Abstract: 1.Ca~(2+)的重要生理作用胞内游离钙浓度(Ca~(2+)])的变化调节着细胞的代谢、基因表达等细胞共有的活动,以及始动兴奋、收缩或出胞分泌以及激活和失活离子通道等细胞不同的反应。Ca~(2+)]的升高主要依赖于胞外钙经质膜上的钙通道内流或/和胞内储存钙的释放。释放的内钙也是藉细胞器膜的钙释放通道进入胞浆。可见通道启闭活动的正常是维持Ca~(2+)]正常的一个重要保证。2.离子通道及其分类离子通道是贯穿于质膜或细胞器膜的大分子蛋白质,其中央形成能通过离子的亲水性孔道(pores)。离子的跨膜转运是通过膜上通道蛋白的功能来完
福建柯属(壳斗科)一新种

植物分类学报 , 1985,
Abstract:
福建壳斗科新植物

植物分类学报 , 1979,
Abstract:
Sr(Fe_(1-x)Ti_x)O_y系列材料的穆斯堡尔谱学研究

科学通报 , 1987,
Abstract: 一、引言 钙钛矿型(ABO_3)化合物由于它们具有十分有用的介电的和磁的性质而受到人们广泛的注意。 关于SrFeO_y的穆斯堡尔谱曾有报道,但对Sr(Fe_(1-x)Ti_x)O_y系列材料的穆斯堡尔谱学研究的报道迄今尚未见到。
北京极端气温变化特征及其对城市化的响应

地理科学 , 2011,
Abstract: 应用1960~2009年逐日气象记录,在对观测资料进行均一化处理的基础上,分析北京地区极端气温的时间变化特征及其对城市化的响应过程。结果表明,过去50a北京极端最高、最低气温分别以0.23℃/10a以及1.02℃/10a的线性倾向率显著增加,在1988年前后存在明显的增暖性突变。1997~2009年间北京高温日数最多,霜冻日数最少。1980年起,北京市区极端最高气温及其增温率明显高于近郊和远郊,高温日数维持市区多于近郊,近郊多于远郊的格局。近、远郊极端最低气温温差高于城、近郊温差。
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