The Dual Model for Tourism Resource Productivity Improvement

For natural resource science, resource productivity studying is an important subject. But researches on tourism resource productivity are limited. The most significant influencing factor on tourism resource productivity is the potential market scale of tourist locations, and second most important influencing factor is the resource endowment. Regional urban population is significantly correlated with region tourist numbers, being the decisive factor of region potential tour market scale. In tourism development, the dual model should be adopted: on one hand to enhance tour spot attractiveness, on the other hand to cultivate the potential market by improving urbanization level and other means. In the situation of tourism development fever spreading, the dual model for improving tourism productivity helps to avoid the "Great Leap Forward" which means that too rapid tourism construction divorces from actual market demand.     

市场失灵、非市场价值与农地非农化过度性损失

农地资源不仅具有经济生产功能,还具有大气调节、涵养水源、保持土壤成分、休闲娱乐等多种生态功能,而在非农化过程中这些功能在市场中没有以价格的形式体现出来,没有包含在农地的现实价值中。因而,有必要对农地的非市场功能进行详尽的分类及价值估算。同时,将由于市场失灵而没能包含到农地总价值中的生态环境等非市场价值纳入到成本效益决策中,来减少市场失灵所造成的农地非农化的效率损失。通过对农地非市场功能的具体分类及量化,测算我国不同经济区域因市场失灵导致的农地非农化过度损失,结果显示,代表东、中、西部地区的江苏、湖北和甘肃省的农地非农化过度损失Ⅰ分别为31.58%、38.13%和43.85%,这为我国农地非农化的行为调控及相应公共政策措施的制订和实施提供了理论依据。     

O3氧化结合化学吸收同时脱硫脱硝的动力学及热力学研究

构建了O3氧化多种污染物的反应机制,并对O3氧化SOx、NOx过程进行动力学模拟,然后利用热力学原理计算出Ca(OH)2和CaCO3湿法烟气同时脱硫脱硝吸收反应达到平衡时SOx和NOx的分压力.结果表明,Ca(OH)2作吸收剂湿法烟气同时脱硫脱硝比CaCO3作吸收剂效果好,而且两者几乎100％地去除烟气中的SOx和NO...     

纳米氧化物对钙基材料在高温燃煤中除砷脱硫的促进机理研究

将纳米MgO、Al2O3和ZnO分别添加于CaCO3中制备出钙基纳米氧化物复合吸附剂,进行了燃煤过程中除砷脱硫的实验研究;对燃煤灰渣进行了比表面积及孔隙度分析、X-射线衍射分析和扫描电镜观察,探讨了纳米MgO对CaCO3除砷脱硫的促进机理。结果表明,添加了纳米MgO的复合吸附剂除砷脱硫性能最好,比单一的CaCO3除砷率和脱硫率分别高出了28．73％和37．21％,表现出同时除砷脱硫的良好性能;其促进机理是纳米MgO的加入改变了灰样的微观结构促进了气相间的流动使得灰渣孔隙明显扩大,提高了CaO与As2O3和SO2反应的能力;在除砷的反应中生成了新的物质Ca3Mg2（AsO4）2,在一定程度上抑制了除砷产物的分解。     

退化河流滨岸带生态系统的修复及评价研究进展

退化河流滨岸带生态系统修复及其评价是目前国内外学者研究的热点,也是修复生态学、流域生态学等学科研究的重要内容之一。河流滨岸带生态修复工作的开展必须建立在掌握滨岸带结构及其生态功能的基础上。河流滨岸带生态系统退化成因和驱动机制研究是进行滨岸带生态修复工作的前提;生态系统修复是滨岸带研究的重点和关键,必须遵循自然法则,以修复生态功能为最终目标;河流滨岸带生态系统的修复过程和效果应该建立适宜的评价方法和管理策略来确定。加强河流滨岸带退化机制的理论研究及3S技术的应用,从景观和流域尺度开展滨岸带生态修复的研究和实践工作,着重进行平原河网地区河流滨岸带生态修复的研究和实践工作等将是中国今后相关研究的重点。     

超声波-铁粉协同降解五氯酚

通过超声波-铁粉联合体系协同降解废水中的五氯酚(PCP).实验结果表明:降解120 min后,PCP去除率可达90.4％;在该体系中铁粉被逐渐腐蚀成Fe2+,随降解时间的延长,Fe2+浓度逐渐增加;体系中的Fe2+可以促进·OH的产生,并且可以与超声空化作用下产生的H2O2发生Fenton试剂氧化反应降解PCP;超声波...     

Direct methanol fuel cell bubble removal mechanism using magnetic actuation

This article develops a direct methanol fuel cell (DMFC) with a magnet-actuated bubble removal mechanism. A micro-DC motor is used to control the bubble removal mechanism. The lower magnetic device is operated to extrude a Polydimethylsiloxane (PDMS) runner to compress the liquid fuel in the anode flow channel, forcing the CO₂ bubbles in the runner to flow toward the outlet end. The bubble retention in the anode flow channel is thereby improved, enhancing the cell performance. The proposed mechanism stability and performance and Polymethylmethacrylate (PMMA) runner are also discussed.     

Experimental thermal storage research of organic binary phase change materials in building environment

This paper aims to reveal the heat transfer mechanism of low-temperature phase change material (PCM) and design PCM heat storage device in building heating environment. Firstly, low-temperature binary PCMs of lauric acid and stearic acid are prepared, and their thermal properties are investigated by DSC. Then, shell and tube latent heat thermal energy storage units are conducted, and heat transfer experiments are carried out to analyze the heat transfer mechanism of PCM. The results demonstrate that natural convection plays an important role in heat transfer process, and the heat storage efficiency of PCMs can be significantly enhanced by increasing the fin width and improving the inlet heat transfer fluid (HTF) temperature. Furthermore, some proposals are put forward to guide the design of PCM storage device in building heating environment.     

铁改性海泡石除锑的影响因素研究

选择廉价海泡石, 用氯化铁对其改性。研究铁改性海泡石对锑的吸附特性。结果表明,氯化铁浓度、吸附时间、初始锑浓度以及温度等因素对锑的吸附影响较大,溶液初始pH影响不明显。在初始锑浓度50 mg/L,pH 6.8,5%氯化铁改性海泡石投加量为2 g/L,吸附90 min, 温度35℃下,吸附量可达21.6 mg/g。海泡石对吸附锑具有缓冲特性,溶液的初始pH值在3.1～10.1范围时,吸附后溶液的最终pH值为8～8.5。IMS吸附锑是放热过程。改性后海泡石比表面积增大,表面羟基数量增加,导致其吸附能力增强。通过XRD谱图并未发现铁晶体的存在。     

壳聚糖衍生物-镁盐复配去除中性兰模拟废水色度的研究

研究了有机高分子絮凝剂NCTS-M对中性兰染料的絮凝性能。通过测量絮体的Zeta电位以及对絮体进行彩色电视显微扫描初步探讨了该絮凝过程的絮凝机理。结果表明,当投加量为30 mg/L,pH=6时,絮凝效果最明显,脱色率可达93.1%。其絮凝机理主要是压缩双电层以及高分子吸附架桥作用,以压缩双电层为基础。絮凝剂中镁离子在中性条件下对絮凝过程也起到了较强的助凝作用。