Formation and Evolution of Ancient Lakes on South Coast Plain of Laizhou Bay

Abstract

Based on the data of historical geography, the analysis of the stratigraphic section, and the textual research of place names and satellite photographic interpretations, the authors study the formation and evolution of ancient lakes on the south coast plain of Laizhou Bay where there were once three lakes: Judian Lake, Qingshuibo Lake and Biehua Lake. All the lakes formed 6000 years ago evolved from the lagoons near the estuary and went through two periods, the golden age in the Middle Holocene and the shrinking age in the Late Holocene. The disappearance of the lakes resulted from the drying climate, the migration of the river courses and the activities of human beings. Among the three reasons, the migration of the river courses is the main one.     

On the Laws and Causes of Socio-economic Territorial Differentiation in Minority Areas in China

Abstract

On the basis of applying quantitative and qualitative approaches as well as GIS technology, this paper established an index system to make a comprehensive evaluation on socioeconomic development of minority areas in China. The result showed that socio-economic development in minority area presents a series of characteristics that the north is high and the south is low, center-margin pattern is obvious and the areas with middle and lower development indices are distributed centrally and continuously. However, the causes of the socioeconomic characteristics mainly include natural conditions, economic development basic, population cultural quality, regional combination and development conditions of mineral and energy resources, informal institutional factors and distribution of major traffic lines.     

Ecotourism Model and Benefits of Periphery Regions in Western Sichuan Province

Abstract

There are many problems in the minority regions of western Sichuan Province, such as serious soil erosion, fragile ecological environment, low levels of economy and so on. Advantages of tourism resources in the “periphery regions” should be fully utilized, and “multitourism” meets the characteristics and present situation of the minority regions. The “multitourism development model” can exert the functions of tourism as the key industry. Based on the demands and the internal linkages among different industries, the model can accelerate the development of related-industries, such as eco-agriculture, eco-industry and so on. Through implementing the multi-tourism model, we can fully utilize the advantages of the periphery regions and promote the sustainable development of regional economy.     

大气甲烷的源和汇

本文通过总结国内外大气甲烷源汇研究的最新进展，论述了全球大气甲烷的源汇平衡预算及其不确定性，给出了全球及中国大气甲烷源汇预算的最新成果，并指出了今后的研究方向和重点．     

Effects of phosphorous on the stabilization of solid waste in anaerobic landfill

Anaerobic bioreactor attracted more attention in recent years because of its environmental and financial benefits. Nutrients and moisture could exert profound influences on the degradation of the pollutants and stabilization of solid waste in anaerobic landfill. The objective of this work was to investigate the effects of the activated sludge and phosphorous addition on the stabilization of solid waste. The experimental results indicated that phosphorous is the limiting nutrients in the landfill leachate; phosphorous and activated sludge simultaneously could stimulate the growth of the bacteria, enhance the attenuation of pollutants in landfill leachate and accelerate the stabilization of solid waste; the final removal efficiency of COD and NH₄⁺-N in R-C (phosphorous and activated sludge added simultaneously) was up to 95.13% and 73.4%, respectively. Therefore, phosphorous addition is an effective way to enhance the stabilization of solid waste in anaerobic landfill.     

沧州市郊采暖期大气颗粒物中重金属的粒径分布及健康风险评价

为了解沧州市郊采暖期大气颗粒物中重金属粒径分布和健康风险,于2018年11—12月使用分级撞击式采样器采集大气颗粒物样品(粒径符合总悬浮颗粒物(TSP)标准),采用电感耦合等离子体发射光谱(ICP-OES)测定Fe、Cu、Mn、Pb和Zn含量,利用富集因子法和美国环境保护署推荐的健康风险评价模型,分析重金属主要来源并对...     

炼铁厂5号高炉槽下布袋除尘器改造

介绍了武钢炼铁厂5号高炉槽下布袋除尘器改造所用袋式除尘器的特点和主要设计方案及取得的效果.     

苏州国际旅游节的SWOT分析及对策研究

旅游节庆活动被看作是“开放经济”的一张亮丽名片，对丰富旅游产品、提升城市整体形象、促进经济和社会事业发展具有积极的推动作用，因此日益受到城市管理者和学术界的关注。苏州国际旅游节作为苏州城市旅游产品的重要组成部分，是近年来苏州旅游产品结构调整的关键环节。运用SWOT对其进行了分析，探讨了今后的发展对策。     

CO_2/H_2S共存腐蚀与缓蚀技术研究进展

文章综述了目前国内外开展CO2/H2S共存条件下的腐蚀机理、腐蚀影响因素以及控制CO2/H2S共存腐蚀的缓蚀剂等研究的最新成果。提出有必要对CO2/H2S共存环境中的金属腐蚀行为及规律、二者对钢材腐蚀的协同作用和交互影响、金属表面腐蚀产物膜对金属基体的保护性能、腐蚀影响因素的主要方面以及控制腐蚀的缓蚀技术、特别是缓蚀剂的合成及缓蚀机理等进行先导性的研究。     

危险废物管理系统的优化

危险废物管理系统的规划和设计包括处理和处置设施的选择、危险废物的分配、废物残渣从产生地运往处理处置点运输路线的选择等。在考虑了不同危险废物的不同特征、不同废物间的相容性、废物与处理技术的相容性、废物处置设施产生的废物残渣和选址问题等,基于多目标整数规划方法,提出了危险废物管理系统的优化模型。其中,经济目标包括运输费用、处理与处置成本、处理废物经济效益,环境目标包括处理设施总的环境影响、运输过程的环境影响,并从经济和环境影响方面,提出了一个综合考虑了费用和环境影响相关目标的复合效用函数。所提出的危险废物管理系统优化模型对我国区域性危险废物管理提供理论参考。