在市场经济条件下推进环境保护服务业发展

长期以来，我国第一产业，第二产业在经济中的比重相对偏高，而服务业却比较落后和幼稚，在21世纪的经济中，服务业的落后才真正意味着经济的落后，随着市场经济的发展，特别是我国加入WTO后，与国际接轨的步伐加快，给服务业尤其是环保服务业的发展提供了机遇，并开辟了广阔的空间，本文分析了我国环保市场及其管理的现状，强调了环保服务业的发展是市场经济的客观要求，明确了现阶段我国环保服务业的基本工作范围，提出了推进环保服务业发展的思路及建议。     

环保产业 亟待整顿

环保产业存在政策不完善、结构不合理、市场混乱、技术含量不高、企业规模效益低下等诸多问题。环保产业健康发展应结合市场经济体制改革,制定和完善产业政策,合理布局产业结构,培育和调控环保产业市场,提高环保产业技术水平和企业规模经济效益,以利于健康、协调、持续和稳定发展。     

市场经济下的环境管理手段

环境管理计划型手段向市场型手段过渡是实现我国经济可持续发展的客观要求,分析环境污染与经济增长的矛盾,讨论市场型环境管理原则的变化和微观管理工具的选择,侧重分析开征污染税的宏观经济效应和具体课征途径。     

社会主义市场经济与环境立法

随着我国社会主义市场经济体制的逐步建立，环境立法也应随这相应发展，环境保护法制建设必要性和重要性，一是填补原有的立法空白，包括持续发展立法，环境保护组织立法环境保护行政法程序立法，二是现行环境法是一些不能与新形势相适应的内容必须加以修改完善，以排污收费为例，分析了实施中存在的问题，探讨了实行环境税的积极作用。     

市场经济条件下环保宣教工作初探

本文从树立新的环保宣教观念，选准突破口，拓宽宣传面等方面阐述了社会主义市场经济条件下如何加强环保宣教工作，强地制宣传是环保宣教的一个重要环节 ，并认为宣教队伍的建设是新时期环保宣教工作的重要保证。     

国外环保产业的发展

对国外环保产业的发展情况及世界环保产业市场状况和发展趋势进行了论述     

明确指导方针建立市场化机制推进环境保护与经济建设双赢

总述了“九五”期间我国环境保护主要成就,并明确指出“十五”期间环境保护的指导方针,指出为实现“十五”环境保护目标,推进环境保护与经济建设双赢,必须建立面向市场的环境保护机制,依靠科技创新,发展绿色经济。     

Migration of saline solutions in variably saturated porous media

Migration of concentrated NaNO3 solutions in homogeneous packs of pre-wetted silica sands was investigated using a light transmission system. Solutions of 5 molal NaNO3 were found to migrate downward 24-62% faster than pure water, in an unstable, fingered manner. This behavior was attributed primarily to a surface tension induced, non-zero apparent contact angle between the imbibing and the resident fluids. For saline solutions of similar surface tension to that of pure water (achieved by the addition of 2% methanol), the migration rates and plume shapes were comparable to that of water, demonstrating that density was not the primary source of the observed differences in migration patterns. At depths where resident saturation increased above residual, the migration process appeared to occur via film flow with slight changes in saturation (<4%), rather than in a series of abrupt jumps, as observed at shallower depths. A method for contact angle scaling was used to illustrate the effects of non-zero contact angles on capillary pressure-saturation curves.     

Renormalized numerical simulation of flow over planar and non-planar fractal trees

We review the fundamentals of a new numerical modeling technique called Renormalized Numerical Simulation (RNS). The goal of RNS is to model the drag force produced by high Reynolds-number turbulent flow over objects that display scale-invariant properties, objects such as tree-like fractals. The hallmark of RNS in this application is that the drag of the unresolved tree branches is modeled using drag coefficients measured from the resolved branches and unresolved branches (as modeled in previous iterations of the procedure). In the present paper, RNS is used to study the effects of branch orientation on the drag force generated by highly idealized trees in which trunk and branches have square cross-section, and the branches all lie in a plane perpendicular to the incoming flow. Then, the procedure is generalized to the more general case of non-planar branch arrangements. Results illustrate that RNS may enable numerical modeling of environmental flow processes associated with fractal geometries using affordable computational resolution.     

“流空间”视域下淮海经济区城乡融合发展驱动机制

从要素流动多维重构淮海经济区城乡融合评价体系,以动态耦合协调度模型测度城乡融合水平并分析其时空分异规律,最后从“流空间”视角探索城乡融合发展驱动机制。结果表明：（1）研究区城乡融合水平整体较低但趋势向好,其正向空间关联和局域内向集聚特征明显。（2）流空间视角下区域呈多中心网络结构,且在人流和资金流下相对紧密,而物流和信息流下“核—辐”结构突出。（3）推动核心区集聚效应转向扩散效应,发挥各城市节点比较优势,合理调节要素流动强度、方向和质量,并在实施地方和国家政策时配套相关制度,方能实现淮海经济区城乡融合“量”“质”同升。