国内外旅游合作关系研究进展

旅游业是一项开放度、关联度极高的新型产业,区域旅游业要实现可持续发展必须重视建立区域旅游合作关系。对近年来国内外有关旅游合作关系的研究成果进行了收集、分析,研究表明,区域旅游合作关系形成的最重要的基础是地缘关系,或者是基于某种共同的目的,特别是旅游业可持续发展等。旅游合作关系可以给旅游区带来很多潜在的利益,但这种关系的建立也有一定的难度。目前,国内外对区域旅游合作关系的研究主要涉及研究的进展和模式、合作的政策及实践3个方面,采取的手段和方法主要为历史资料收集与实地调研。     

雪峰山西侧地区海相油气勘探前景初析

通过对雪峰山西侧地层叠覆关系、沉积序列、层序地层和旋回沉积特征等油气地质的调查研究,表明雪峰山西侧盆地演化与四川盆地一样,均经历了从被动陆缘(Z-O1)→类前陆(O2-S)→克拉通-大陆边缘盆地(D-T2)→内陆湖盆(T3-J)和山间盆地(K-Q)5个演化阶段;发育9个区域性平行不整合和1个角度不整合,构成5个构造层,即①南华系-震旦系;②下古生界;③上古生界-下中三叠统;④上三叠统-下中侏罗统;⑤上白垩统及其以上.总体构造活动性不强,对油气长期保存和演化有利.5个构造层孕育了4个一级生储盖组合,其中Ⅰ、Ⅱ为有利组合.因此,该地区原生油气地质条件优越,但后期改造较强,特别是侏罗纪末期的燕山运动以来的造山和隆升剥蚀量大,是该区海相下组合油气勘探的制约性因素.     

The validity of the monocentric city model in a polycentric age: US metropolitan areas in 1990, 2000 and 2010

In this article, we use local indicators of spatial association (LISA) and other spatial analysis techniques to analyze the distribution of centers with high employment density within metropolitan areas. We examine the 359 metropolitan areas across the United States at three points in time (1990, 2000, and 2010) to provide a spatio-temporal panoramic of urban spatial structure. Our analysis highlights three key findings. (1) The monocentric structure persists in a majority of metropolitan areas: 56.5% in 1990, 64.1% in 2000, and 57.7% in 2010. (2) The pattern of employment centers remains stable for most metropolitan areas: the number of centers remained the same for 74.9% of metropolitan areas between 1990 and 2000 and for 85.2% between 2000 and 2010. (3) Compared with monocentric metropolitan areas, polycentric metros are larger and more dense, with higher per-capita incomes and lower poverty rates.     

Marine GIS: Identification of mesoscale oceanic thermal fronts

A new method (the ‘sink’ method) is proposed for the mapping of productive mesoscale oceanic thermal fronts based on the combined analysis of satellite imagery for sea surface temperature (SST) distribution and chlorophyll (CHL) concentration under a Geographic Information System (GIS). In an SST lattice data array, data value sinks describe heterogeneous drops in SST distribution as this is compared to more homogeneously distributed SST in the surrounding area. Using Arc/Info GIS, these thermal discontinuities are flagged and applied on SST and CHL imagery for the calculation of differences in SST and CHL patterns (DSST and DCHL) inside and outside of these flagged areas. Spatially connected sinks that are characterized by simultaneous negative DSST and positive DCHL pattern are mapped as thermal fronts. Results include a time series of monthly front occurrence GIS maps in Eastern Mediterranean waters along with three calculated front characteristics (DSST, DCHL and bathymetry). Comparisons between the mapped fronts and isobath distributions present clearly visible front‐to‐isobath spatial and shape associations while spatial analysis between front and wind data explains 66% of the number of mapped fronts.     

东北三省城市紧凑度分布特征与空间关联分析

紧凑型城市发展是相对于分散型城市发展较为经济的一种发展模式。为探索东北三省城市紧凑度现状及特征,首先,从土地利用紧凑性、经济紧凑性、人口紧凑性、基础设施紧凑性,环境协调等方面切入,建立紧凑度评价的指标体系,运用熵值法对东北三省地级及以上城市的紧凑度进行了评价,并从空间和数量统计角度,应用SPSS软件,归类分析了城市紧凑度的分布特征;其次,以计算得到的紧凑度指数为基础,借助GIS软件,运用空间全局/局部自相关分析方法对东北三省城市紧凑度分布的相关性进行了分析,并利用地理加权分析方法,对紧凑度与影响紧凑度分布的主要因子的关联性进行分析。研究结果表明,东北三省城市紧凑度呈现出较为突出的极化分布现象,不同主因子对紧凑度分布影响的差异性显著。     

新疆北部大地构造演化阶段与斑岩－浅成低温热液矿床的构造环境类型

本文系统总结了新疆北部斑岩-浅成低温热液矿床的成矿时代,按构造环境将该类矿床归为三大类型:洋-陆俯冲型、碰撞造山型、板内型,其中碰撞造山型又可分为碰撞型和后碰撞型。4类矿床的差别主要在于矿床金属元素组合,以及同期相伴出现的矿床类型不同:俯冲型斑岩矿床以斑岩Cu-Au矿-浅成低温热液Au矿组合为主,以伴有海相火山岩有关的VMS矿床和铁矿为特征;碰撞型和后碰撞型矿床以斑岩Cu-Mo-Au组合为主,伴有构造蚀变岩型复合/叠加的浅成低温热液型Au矿出现;板内型矿床以斑岩型单Mo(或Mo-Re)组合为主。斑岩矿床与浅成低温热液矿床虽为同一成矿系统,但二者基本不共生,且后者成矿时代一般晚于前者10～20 Ma。斑岩-浅成低温热液矿床的含矿岩石和成矿特征并不随构造环境类型不同而出现特征性差别。不同时期的斑岩矿床在分布上具有继承性和"同位成矿"特点,并表现出一定的分带性,从早到晚逐渐由靠近缝合带向外扩展、由线型分布逐渐趋于面型分布。     

安徽铜陵地区中生代侵入岩成因及成矿意义

安徽铜陵矿集区是我国最著名的铜、金、铁产地之一,成矿与岩浆作用关系密切.本次对铜陵地区中生代侵入岩进行了系统的矿物学、岩石学和元素地球化学研究.结果表明:①本区岩浆岩主要为辉石(二长)闪长岩( SiO2≤55％)、石英(二长)闪长岩(SiO255％～65％)和花岗闪长岩(SiO2≥65％)三种岩石组合,其矿物成分主要为...     

Geochemical anomaly structure of South Mining District of Fenghuangshan Copper Mine

To study the geochemical anomaly structure of multi-element associations in the South Mining District of the Fenghuangshan Copper Mine,samples were collected and analyzed for their trace element contents.Multi-element anomaly associations were divided according to the correlations between Cu and each of the other elements,and the distribution characteristics of multi-element anomaly associations were also described.Among them,the anomaly distribution of metallogenic element Cu indicates the environment of mineralization.This study provided the basis for research on the metallogenic prediction and geochemistry of the Fenghuangshan Copper Mine.     

空间分类在连锁超市选址中的应用研究

空间数据挖掘是一种知识决策支持技术,本文以大型综合连锁超市为例,研究了空间分类挖掘方法在连锁超市选址预测中的应用问题。结合连锁超市定位理论,对实验数据进行了选择和处理。同时进行了基于关联的分类实验,得到指导和预测选址的知识,并对预测知识的准确性和可信度进行了检验,结果显示预测准确率和可信度较高。本文制定的挖掘方案可为连...     

Inland capture fisheries in the Mekong and their place and potential within food-led regional development

The inland capture fisheries of the Mekong represent critical sources of nutrition in rural diets in a region that faces endemic food and nutritional deficits. However within regional development debates that prioritize utilising the waters of the Mekong to generate electricity, capture fisheries are often presented as ultimately doomed, and therefore as an unfortunate, but necessary trade-off for hydropower. At the heart of these debates, lie contested definitions of development. The notion that fisheries could or should be traded-off for some other form of development exemplifies this tension.This paper draws on anthropological approaches to policy analysis based on discourse and narratives. We begin by placing the conventional wisdom regarding the place of fisheries in regional development under closer scrutiny. We then explore the potential for a counter narrative based around food and food sovereignty, in which fisheries and fishers are drivers, rather than costs of development. We argue that fisheries provide a range of livelihood and developmental values that cannot be replaced and that their management continues to hold potential for strengthening independence and self-reliance. In doing so, we build on empirical evidence from the Lao PDR, a country with a rich capture fishery but also endemic food crises, and also a national policy commitment to both poverty reduction and extensive large-scale hydropower development. As such, this paper attempts to reframe the debate on development in the Mekong. The paper has wider significance for considering how a broader focus on food and food producers can generate alternative development pathways.