An Empirical Comparison of the Four Channel Flow Model and Adventure Experience Paradigm

The objective of this study was to conduct empirical comparisons between two models of optimal experience within an on-site whitewater kayaking setting using a modification of the Experience Sampling Method. Four concerns are examined: (1) differences in explanatory power between the four channel flow model and the Adventure Experience Paradigm, (2) convergent validity among measures used to determine conditions within these models, (3) differences among measures of perceived challenge and risk between test times of Class I-V river difficulty, and (4) differences among measures of perceived skill and competence between test times of Class I-V river difficulty. Questionnaires were administered in the Cheat River Canyon in West Virginia to 52 whitewater kayakers at eight sites of various levels of river difficulty. Data were analyzed at the experience level, rather than between subjects, using 409 experience sampling observations. Hypothesis testing, performed with statistical analyses (stepwise regression, correlations, and repeated measures ANOVA), suggested that the explanatory powers of the four channel flow model and Adventure Experience Paradigm were similar and indicated support for convergent and ecological validity of measures used to determine conditions within each of the two models.     

泛珠三角经济一体化的趋同效应实证研究

通过对泛珠江三角地区9+2个城市1992～2008年面板数据进行实证研究,结果发现,泛珠三角地区的人均产出存在条件趋同,而产业结构调整则存在绝对趋同。由于各地区的先天性差异以及制度性缺陷,导致地区间协同效应受限,使得泛珠三角地区的合作并未完全有效的发挥,地区间产业存在着同构化问题,经济发展速度仍然存在差距。     

旅游业区域溢出的可计算模型及案例

一个开放的经济系统中,旅游业区域溢出广泛存在,而溢出大小除了与两个旅游区之间的规模等级差异和空间距离呈负相关外,还与它们之间的类型差异和接受溢出方的学习能力呈正相关。本文即是对上述溢出影响因子进行综合,借鉴经典知识溢出公式而构建了一个测度旅游业区域溢出的机理模型S(ji)=δje-1δ(jl)Gi(jl)2+δ(jk)G(ijk)-βrij,并在进一步的变量定义和参数估计后,实现了模型的可计算化。此外,本文还利用该模型对长江三角洲"15+n"旅游城市之间的溢出情况进行计算,在验证模型可信度的同时也分析了区域旅游合作及相应旅游圈组织的有效性问题,取得了一些有益的认识。     

Spatial and temporal analyses of potential land use conflict under the constraints of water resources in the middle reaches of the Heihe River

With the rapid urbanization in China, land resources are becoming increasingly scarce. Identifying and resolving land use conflict is essential for reasonably using land resources and achieving land sustainability. Taking the middle reaches of the Heihe River as an example, we included the constraints of local water resources to construct a multi-criteria evaluation system for assessing land use competitiveness in 2000 and 2015 based on land use, socio-economic, and nighttime light data. By comparing the competitiveness of cultivated land, construction land and ecological land, we then derived the spatiotemporal patterns of potential land use conflicts. Actual land use changes supported the hypothesis that land use tended to convert into the type with higher competitiveness at areas with intense conflict, which better indicated that our assessment model was effective. The results showed that the potential land use conflict was more acute in the central and northwest but weak in the southeast and northeast, and its pattern showed a significantly positive spatial autocorrelation. The conflict between cultivated land and construction land was most prominent and mainly occurred in the transitional zone from urban to rural areas. Rapid urban development and water shortage were the main causes of the potential land use conflict. Assessing land use multi-functions and making a tradeoff among ecological, economic, and social services will be an effective way to guide future land use to solve land use conflict. Our research provides scientific evidence for sustainable land use planning and management in the arid areas.     

历史记载以来黄河下游河道变化及沉积环境分析

论文对近历史记载以来黄河下游河段河道变迁历史进行总结概括并重新绘制了黄河下游河道变迁示意图。黄河下游河段按流向分为北、东、南三个方向。北流河道相对分散,形成了一系列三角洲沉积,有的已被沿岸河流带来的沉积物覆盖;东流河道在入海口处河道变迁频繁,形成了规模较大的三角洲并持续至今。南流河道在摆动起始有多股漫流,经由淮河水系扩散,至苏北一带汇成一股由苏北汇入黄海并在苏北形成了规模较大的三角洲。结合相关研究成果,分析黄河河口沉积环境发现:黄河入海泥沙堆积有极高的沉积速率,在沉积年份每年可沉积数十厘米至数米,可以快速向海淤进形成三角洲,而黄河行水期结束后,则无沉积甚至被侵蚀。研究结果表明,北至海河、南到淮河的大范围内沉积环境的塑造均与黄河有关,黄河与下游的滦河、小清河、弥河、潍河、淮河、射阳河等相互影响,共同塑造了华北平原的沉积格局。     

基于改进STIRPAT模型的城镇化水平对工业废水排放的影响——以长江经济带为例

长江经济带城镇化的发展促进了工业的进步,而工业发展的同时也伴随着工业废水排放的增加及对水环境的破坏。通过建立城镇化与工业废水排放之间的STIRPAT模型,分析长江经济带城镇化对工业废水排放的具体影响。结果表明:长江三角洲经济区及长江经济带整体城镇化水平与工业废水排放之间存在着倒N型关系,长江上游经济区和长江中游经济区的城镇化水平与工业废水排放之间存在倒U型曲线关系;经济发展水平和人口规模对工业废水排放的影响存在地区差异;长江经济带及各区域技术水平和产业结构对工业废水排放存在显著的正向影响。据此,在推动新型城镇化建设中,应采取政策扶持、转变经济发展方式、提高公众环保意识、调整产业结构及加速技术创新等措施,以期减少工业废水排放。     

澜湄流域跨境航运的多层次网络治理机制

在"一带一路"倡议大背景下,澜湄合作机制将"互联互通"纳入五大优先合作方向,对澜沧江-湄公河流域的跨境航运治理提出了新要求。随着全球化、信息化和区域一体化的发展,流域内的单一科层治理、市场治理传统模式频现失灵,网络化提供了不同的视角与方法。兼具"圈层"和"网络"双重结构特征的多层次网络治理结构,从"政府-市场-社会"3个层面通过科层、市场、网络治理方式共同发力,借鉴莱茵河的成功治理经验,给予涉水企业、民众、NGO、智库、媒体、科研机构等非政府主体更多治理权限,并结合澜湄流域实际情况提出多层次网络治理机制体系建议,以求改善澜湄跨境航运合作困境。     

破解“化工围江”难题的“湖北样本”和“江苏样本”

长江经济带化工产业在全国化工发展格局中占据重要地位。在长江经济带沿线11省份中,湖北省、江苏省化工产业规模位居前列,在化工产业快速发展的同时,“化工围江”难题日益凸显。湖北省、江苏省先后颁布实施一系列规划与政策,引导化工产业转型升级发展,成为破解“化工围江”难题的典型样本。通过对比分析“湖北样本”和“江苏样本”,得到破解“化工围江”难题的启示：科学理念引导化工产业绿色发展;规划先行推动化工产业创新发展;政策支持保障化工产业健康发展。     

粤东西北与珠三角物流产业技术效率比较

运用DEA效率测度方法,通过对2013-2017年粤东西北与珠三角区域物流产业技术效率的对比研究,探索推动广东省区域物流协调发展的路径。结果显示:对比珠三角区域,粤东西北区域物流产业技术效率与珠三角区域存在较大差距,尤其是粤东与粤西地区,粤东区域物流产业技术效率值仅为0.4,粤西区域物流产业技术效率值为0.81,均远低于珠三角区域物流产业技术效率值0.94。纯技术效率低下是制约粤东西北地区物流产业技术效率提升的主要因素,应加强物流产业信息技术应用,推进物流技术装备现代化,提高技术创新能力水平。     

长三角区域自主创新及利用FDI的关系研究

利用FDI为引资地区提高自主创新水平创造了一个高级的开放式创新平台,自主创新能力的提升为吸引高质量的FDI提供了必要条件。因此,自主创新与利用FDI是相辅相成的。本文通过实证分析长三角各省市的自主创新及利用FDI的协整关系,发现长三角各省市的自主创新和实际利用FDI之间既存在正的、也存在负的长期均衡关系。据此建议,加大高质量FDI引进力度,提升长三角科研人员的创新能力,加大研发经费投入,加强本土公司创新产出的成果转化能力。