欠发达资源丰富农村旅游业成长模式探讨

本文在阐述欠发达资源丰富农村概念的基础上,分析了其资源的组合类型,并进行了其旅游开发现状特征及制约因素的分析,从而设计了三类旅游业成长模式,并进行了案例研究。     

西安市相对资源承载力与可持续发展研究

以全国和陕西省为参照区域,分别计算了1978、1980、1985年和1990-2002年间各年西安市自然资源、经济资源的相对承载力和综合承载力,同时分析了它们的动态变化过程。指出西安市由于人口增长、经济发展与资源利用的不协调,导致其综合承载力长期处于超载状态,而且近年来由于水、土资源的大规模开发利用,使超载状态愈趋加重。因此,西安市的可持续发展应采取合理控制自然资源开发规模、大力发展经济、控制人口增长等措施,不断协调人口、资源、环境和发展的矛盾,逐步走向可持续发展。     

长江三峡库区旅游资源可持续利用研究

现代旅游业的发展建立在资源的可持续利用和环境的有效保护基础上,文章从长江三峡库区旅游业的发展现状、存在的问题、旅游资源的特征以及三峡工程兴建给长江三峡库区旅游业发展带来的深远影响分析入手,探讨了长江三峡旅游资源的开发模式与可持续利用问题。提出了三峡库区旅游资源的开发应在遵循非均衡空间开发格局的同时实施"点-轴-网"战略开发模式,并指出"一线二区三精品"的战略开发重点和可持续利用的途径。     

历史文化名城凤阳旅游资源开发利用研究

文章分析了历史文化名城凤阳旅游资源的特点,对其旅游资源的价值和开发条件进行了评价和分析,并提出了开发利用的对策.     

Experimental study of aqueous fluid infiltration into quartzite: implications for the kinetics of fluid redistribution and grain growth driven by interfacial energy reduction

To investigate the kinetics of interfacial energy‐driven fluid infiltration, experiments were carried out in a quartzite–water system at 621–925°C and 0.8 GPa. Infiltration couples were made by juxtaposing presynthesized dry quartzite cylinders and fluid reservoirs. The infiltration process was confirmed by the presence of pores at the quartzite grain edges. As predicted from theoretical considerations and previous experiments, wetting fluids such as pure water and NaCl aqueous solution infiltrated into quartzite, whereas nonwetting CO₂‐rich fluids did not. Newly precipitated quartz layers at the surfaces of the infiltrated sample proved that infiltration took place by a dissolution–precipitation mechanism. The enhancement of grain growth by fluid infiltration was observed over the entire range of experimental temperatures. The fluid fraction, gauged by the porosity of the run products, increases at the infiltration front and then decreases towards the fluid reservoir to form a high‐porosity zone with a maximum porosity of 2.3–2.9%. As infiltration proceeds, the high‐porosity zone advances like a travelling wave. This porosity wave is probably caused by a grain curvature gradient resulting from preferential grain growth in the infiltrated part of the quartzite, perhaps combined with other factors. The infiltration kinetics were modelled with a steady‐state diffusion model over the high‐porosity zone. The solubility difference between dissolving and precipitating grains was deduced to be 2 × 10^?2?3 × 10^?1 wt %. The experimentally obtained infiltration rate of aqueous fluid in the steady‐state diffusion regime (2 ± 0.5 × 10^?8 m sec^?1 at 823°C) is much faster than the estimated metamorphic fluid flux rates, so that interfacial energy‐driven fluid redistribution in quartz‐rich layers could significantly contribute to the fluid flux in high‐grade metamorphism, at least over a short distance. Cathodoluminescence observations of the run products revealed that the grain growth of quartzite in the presence of fluid proceeds extensively, which would promote the chemical equilibration between fluid and rock more effectively than would volume diffusion in quartz crystals.     

湿地公园建设与湿地旅游资源保护的协调机制研究——以江苏、上海沿海湿地自然保护区为例

本文从湿地公园的概念与研究动态入手,以江苏、上海沿海湿地自然保护区为例,提出了湿地公园建设与湿地旅游资源保护的协调机制,从理念、目标、规划与政策、技术和管理、决策调控五个层面提出协调机制实施的基本模式。通过研究,希望能丰富湿地旅游资源保护的方法和途径,对湿地生态功能结构的维护和资源开发提供新的思路。     

国际酒店人力资源管理研究述评——主题与趋势的引文分析

本文运用基于Histcite软件的引文分析方法和基于Citespace软件的共被引分析方法,系统梳理了近20年发表在6本旅游及接待业著名期刊上酒店人力资源管理的相关文献.研究结果显示,引文分析有助于厘清研究主题的演进关系,而共被引分析有助于识别研究前沿和研究热点,并讨论了酒店人力资源领域研究成果的实际应用价值.     

中国磨制石器起源的南北差异

磨制石器的起源是学界关心的问题之一,本文试图探讨中国早期磨制石器的主要种类、发展阶段及南北差异的原因,以期揭示磨制石器起源的内在机制。磨制石器的起源与生业经济紧密相关,中国旧石器向新石器过渡阶段对于植物资源的利用促使了中国磨制石器的起源。由于中国南北环境的差异,对于植物资源的利用种类和利用方式有所区别,因此导致中国南北磨制石器种类的不同。     

Hydrothermal,multiphase convection of H2O‐NaCl fluids from ambient to magmatic temperatures: a new numerical scheme and benchmarks for code comparison

Thermohaline convection of subsurface fluids strongly influences heat and mass fluxes within the Earth's crust. The most effective hydrothermal systems develop in the vicinity of magmatic activity and can be important for geothermal energy production and ore formation. As most parts of these systems are inaccessible to direct observations, numerical simulations are necessary to understand and characterize fluid flow. Here, we present a new numerical scheme for thermohaline convection based on the control volume finite element method (CVFEM), allowing for unstructured meshes, the representation of sharp thermal and solute fronts in advection‐dominated systems and phase separation of variably miscible, compressible fluids. The model is an implementation of the Complex Systems Modelling Platform CSMP++ and includes an accurate thermodynamic representation of strongly nonlinear fluid properties of salt water for magmatic‐hydrothermal conditions (up to 1000°C, 500 MPa and 100 wt% NaCl). The method ensures that all fluid properties are taken as calculated on the respective node using a fully upstream‐weighted approach, which greatly increases the stability of the numerical scheme. We compare results from our model with two well‐established codes, HYDROTHERM and TOUGH2, by conducting benchmarks of different complexity and find good to excellent agreement in the temporal and spatial evolution of the hydrothermal systems. In a simulation with high‐temperature, high‐salinity conditions currently outside of the range of both HYDROTHERM and TOUGH2, we show the significance of the formation of a solid halite phase, which introduces heterogeneity. Results suggest that salt added by magmatic degassing is not easily vented or accommodated within the crust and can result in dynamic, complex hydrologies.     

Thermal springs and heat flow in North America

Thermal springs are commonly thought to be an indicator of geothermal resource potential. However, there have been few analyses of the relationship between thermal springs and the underlying thermal regime. An examination of temperature and discharge rates for a large database of thermal springs in North America demonstrates that there is not a simple relationship between these measurements made at the surface and subsurface heat flow. Hydrogeological factors appear to exert strong controls on the temperature and discharge at these springs and should be carefully considered in geothermal resource assessments.