基于协同理论的旅游综合体演化过程与机制研究——以杭州西溪国家湿地公园为例

选取杭州西溪国家湿地公园作为案例地,引用协同理论为指导,探讨了旅游综合体的演化过程与机制,认为西溪国家湿地公园是由多要素组成的协同系统,经历了旅游产业要素“集聚-共生-融合”的演化过程,萌芽、成长和完善3个阶段集聚的分别是传统旅游业态要素、新兴旅游业态要素和创新旅游业态要素。演化本质是协同系统序参量的变化,不同演化阶段序参量各异,萌芽阶段体现为要素集聚,受外部经济效益驱动;成长阶段体现为要素共生,受内部要素结构调整驱动;完善阶段体现为要素融合,受创新驱动。演化动力是要素间的非线性作用,通过系统内部与外部的能量交换及子系统间相互作用所形成的反馈机制来实现。选取房价作为指标,采用均质与非均质空间比较法测定了西溪国家湿地公园的空间溢出效应。旅游业与相关产业协同创新是西溪国家湿地公园发展模式的主要特征,具体表现为以优良的资源禀赋和广阔的市场为基础,以旅游业为核心,吸引相关产业要素集聚,形成共生和融合效应,发展过程中注重外部物质能量交换和内部自组织调控。     

Discovery of Palaeozoic Karsts in the Qaidam Basin and Their Oil and Gas Prospects

正Objective Complex geological factors have been constraining the oil and gas exploration in the Paleozoic strata of the Qaidam Basin,although there are high-quality hydrocarbon source rocks.One of the most important reasons may be reservoir densification due to the multiple stages of destructive cementation,which has hindered our understanding of the Paleozoic petroleum enrichment rules in the Qaidam basin.In recent years,the petroleum     

Recent research progress and prospects in tourism geography of China

Based on a large number of domestic literature reviews with related research abroad, academic standards and issues awareness have been intensified in domestic tourism geography, disciplinary consciousness and innovation enhancement. Hence, some valuable achievements have been made in the areas of tourism resources, tourism regional system, the spatial structure of tourism, tourism flow, ecotourism, tourism industry, tourism planning and tourism impacts, which strengthened the traditional advantages of research, expanded new areas of research and made research trends diverse. Meanwhile, with innovation of research methods, tourism geography in China is getting more and more internationally-oriented and reflecting Chinese characteristics. Research trends of China’s tourism geography are prospected: 1) Catering to national strategic needs, persisting problem-oriented, strengthening the metatheoretical research, and building Chinese “localization” of theory of tourism geography and method system. 2) Introducing and assimilating foreign theories and research methods, while focusing on explaining new tourism phenomena and problems in the domestic socio-economic background. 3) Concerning about the new regional spatial processes of demographic process, social process, and spatial process in new tourism trend. 4) Exploring interactive process and mechanism of man-land relationship and new models to develop territorial space under the tourism impacts. 5) Exploring important research issues of tourism geography in global, national, regional and local scales, from the point of view of spatial differentiation, scale transformation, interaction of man and nature, creating tourism geography interpretation system based on “process-structure-mechanism” of China. 6) Building theoretical system actively, while strengthening application-oriented research, and focusing on tourism poverty alleviation, tourism and heritage protection, national parks’ construction and other hot issues. Faced with econometrics research boom, we should return to rational thinking, using big data scientifically, while paying attention to the important role of qualitative evaluation in future research.     

一种GPS IIR-M型卫星超快星历钟差预报的高精度修正方法

针对IGS超快星历钟差预报产品(IGU-P)精度较低及无法满足高精度实时PPP定位精度的问题,提出了一种GPS IIR-M型卫星超快星历钟差预报的高精度修正方法。该方法对预报值的第一个数据与IGU观测部分(IGU-O)数据的最后一个历元做差,根据差值对整个IGU-O差分序列的影响程度来确定精度修正的大小和方向,从而实现IIR-M型卫星高精度预报的效果。经过IGU实测数据的测试结果表明,在短期预报6 h范围内,本文提出的精度修正方法可使3种预报方案在原有预报精度基础上分别提升6.13%、3.9%和3。48%,预报精度分别控制在0.599 ns、0.570 ns和0.531 ns,且均优于IGU-P产品预报精度。     

Experimental study on unfrozen water content and soil matric potential of Qinghai-Tibetan silty clay

A new soil moisture content sensor coupled with a new matric potential sensor that can operate in the subfreezing environment was used to measure the moisture content and soil matric potential dynamics of Qinghai-Tibetan silty clay. Combined with nuclear magnetic resonance (NMR) technique and thermal resistor temperature probe, the characteristics of unfrozen water content and soil matric potential, and their relationships with temperature were analyzed. The results show that initial water content has an impact on the freezing point and unfrozen water content. The decrease in the initial water content results in a depression in the freezing point. The Qinghai-Tibetan silty clay has more similar unfrozen water content characteristic to clay than to silt. There is approximately 3% of unfrozen water content retained when the soil temperature drops to −15°C. The change of soil matric potential with temperature is similar to that of the unfrozen water content. The matric potential value of the saturated silty clay is approximately −200 kPa when the soil temperature drops to −20°C. The measured matric potentials are significantly lower than the calculated theoretical values based on the freezing point depression. Moisture migration experiment indicates that soil matric potential controls the direction of moisture movement and moisture redistribution (including ice and liquid water) during the soil freezing.     

The Formation Model for Marine Potash Deposits within China’s Small Continental Blocks

正Chinese geologists have always been expecting to find out a large scale of potash deposits in marine basins,but only one small-middle scale industrial solid potash deposit had been found at Mengyejing in Langping-Simao basin     

Saline Lacustrine Source Rocks and their Generated Gas Composition

正Based on salinity,organic geochemical tests and gas generation simulations of mudstones,this paper has studied the effects of salinity on organic matter richness,types and thermal maturities and generated gas