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排序方式: 共有181条查询结果,搜索用时 125 毫秒
1.
冀北超基性岩带位于华北地台北缘,受崇礼-隆化深大断裂控制。该岩带从西往东可分为赤城、丰宁-滦平和承德-平泉三个超基性岩群。各岩群的形态、产状、岩石类型、矿物成份、化学成份各有特点,表现出一定的规律性。K-Ar及Sm-Nd同位素年龄表明,这些超基性告形成于中元古宙、海西期及印支期。 相似文献
2.
天山北坡经济带绿洲生态经济脱钩分析 总被引:4,自引:0,他引:4
本文根据脱钩理论与模型的基本思想,引入转移投入概念,建立了绿洲脱钩分析模型,对"七五"以来四个五年计划期间GDP快速增长的天山北坡绿洲经济带的生态—经济关系进行了分析,提出了经济带脱钩关系特点,进一步提出了绿洲经济优化调控的建议。 相似文献
3.
陕西区域经济发展新布局探源 总被引:2,自引:0,他引:2
陕西省"十一五"规划对陕西区域经济发展新布局做出简明概括——关中率先发展,陕北跨越发展,陕南突破发展。这种新布局经历了三个阶段的历史演化:一是20世纪80年代的重点发展关中,积极开发陕南、陕北;二是20世纪90年代的重点发展关中,加快开发陕南、陕北;三是21世纪初的这种新概括。其理论源流有五说,即要素禀赋说、机遇说、领头羊说、后发优势说和三元经济说。其实施之策有四,即扬长避短、扬长补短、点面兼顾与六大动力和而不同。 相似文献
4.
Marvin Goodfriend׳s (2014) insightful, informative and provocative work explains concisely and convincingly why the Fed needs rules and boundaries. This paper reviews the broader institutional design problem regarding the effectiveness of the central bank in practice and confirms the need for rules and boundaries. The framework proposed for improving the Fed incorporates key elements that have already been adopted in the European Union. The case of ELA provision by the ECB and the Central Bank of Cyprus to Marfin-Laiki Bank during the crisis, however, suggests that the existence of rules and boundaries may not be enough to limit harmful discretion. During a crisis, novel interpretations of the legal authority of the central bank may be introduced to create a grey area that might be exploited to justify harmful discretionary decisions even in the presence of rules and boundaries. This raises the question how to ensure that rules and boundaries are respected in practice. 相似文献
5.
The ‘All Inclusive’ (AI) concept has revolutionized package hospitality services and captured the attention of many industry stakeholders. Scholars have mostly investigated AI from the marketing perspective, whereas the economic ramifications of this type of product, for both hospitality operators and local communities, are still a barren landscape. Using a mixture of quantitative analysis techniques, including a two-step cluster analysis and econometric modeling, the study aims to enhance our conceptual capital pertaining to the economic impact of AI for local communities. The study focuses on overall tourists' spending, both within and outside their accommodation, with expenditure segmented into seven study-specific categories that highlight the economic specificities of AI. Findings, of interest to industry stakeholders, revealed the problematic and ambiguous status of AI provision in Cyprus, whereas actions, espousing the principles of cluster theories, that could maximize the economic contribution of AI to local economies are suggested. 相似文献
6.
为优化粤北山区产业结构调整,促进区域旅游经济均衡协调发展,收集2013—2017年粤北山区5个城市旅游资源、旅游市场、社会经济、生态环境四大维度的统计数据,运用生态位理论,对其旅游生态位发展态势、生态位扩充程度进行评测与排序。从分析结果可见,韶关综合生态位排名第一,为粤北山区旅游城市中的双核心城市。韶关、梅州旅游业发展态势良好,处于扩充状态,其区域旅游业影响力日益增强。通过粤北山区旅游生态位综合分析,可见要实现区域协调均衡发展,重点在于搭建区域旅游一体化合作平台,致力于产业集聚与优势互补,注重旅游经济投入与产出比优化,从而实现弱势旅游地的突围与转型。 相似文献
7.
新疆南北疆区域经济差异预警研究 总被引:1,自引:0,他引:1
当前,对新疆南北疆区域经济差异进行分析并及时进行预警有着极为特殊的政治、经济和社会意义。从对目前新疆南北疆的经济规模、地区经济影响力的差异分析来看,南北疆区域经济发展水平不平衡,地域差异性较为显著,而且北疆地区内部差距均小于南疆地区;从对南北疆地区区域经济差异预警分析来看,南北疆区域经济的绝对差异已经出现过大的特征,南北疆整体经济相对差异也十分明显,而且南北疆内部各地、州、市之间的经济绝对差异和相对差异也不一致。因此,须对新疆南北疆区域经济差异进行调控,促进区域经济协调发展;利用各省市对口支援的机遇,加快落后地区经济快速发展;组织区域经济合作,加强南北疆地、州、市之间的相互支援与合作。 相似文献
8.
This paper develops a composite participation index (PI) to identify patterns of transport disadvantage in space and time. It is operationalised using 157 weekly activity-travel diaries data collected from three case study areas in rural Northern Ireland. A review of activity space and travel behaviour research found that six dimensional indicators of activity spaces were typically used including the number of unique locations visited, distance travelled, area of activity spaces, frequency of activity participation, types of activity participated in, and duration of participation in order to identify transport disadvantage. A combined measure using six individual indices were developed based on the six dimensional indicators of activity spaces, by taking into account the relativity of the measures for weekdays, weekends, and for a week. Factor analyses were conducted to derive weights of these indices to form the PI measure. Multivariate analysis using general linear models of the different indicators/indices identified new patterns of transport disadvantage. The research found that: indicator based measures and index based measures are complement each other; interactions between different factors generated new patterns of transport disadvantage; and that these patterns vary in space and time. The analysis also indicates that the transport needs of different disadvantaged groups are varied. 相似文献
9.
北京奥运我国金牌总数首登第一,取得了举世瞩目的成绩,国人为之振奋,这些成绩的取得与各级体校的贡献是分不开的,北京奥运后各级体校应如何发展决定着后备人才的培养情况,笔者对陕北各级体校办学现状进行调研,客观分析了存在的问题,提出一些较符合陕北实际的有利于各级体校发展的建议,旨在为陕北各级体校的可持续发展提供参考。 相似文献
10.