贵州实现资源优势转换战略的途径与对策

提出了将贵州资源优势转变为产业优势,进而转变为经济优势的途径与对策.贵州实施优势矿产资源转换战略,就是要充分发挥资源比较优势,形成产业优势和经济优势,加快发展具有贵州特色的能源、原材料工业;以矿产资源开发为基础,优先发展矿产资源加工业,推进区域工业化进程,提高资源的附加值.     

赣中南柑橘果实生长发育规律与栽培技术关系

通过果实体积的累积生长量,日均生长速度和相对生长速率三个指标的测定。可得到各类果实生长的“Ｓ”形曲线。生长呈三个时期,第一期为细胞分裂期,这个时期,生长速度较慢,而相对生长速率最高,是是实生长能力最高阶段;第二期为细胞膨大期,生长速度最快时期,而相对生长速率则呈下降趋势;第三期为成熟期,日均生长速度和相对生长速率都是低速和稳定时期。主要内部生理变化,柑橘各类果 个指标各异,此外,果实生长过程中,有     

AN EXAMINATION OF RELATIVE PERMEABILITY RELATIONS FOR TWO-PHASE FLOW IN POROUS MEDIA1

ABSTRACT: A key parameter in modeling two-phase flow phenomena is relative permeability. It is important to understand which variables influence relative permeability, especially since so few measurements of relative permeability have been made for typical contaminants at hazardous waste sites. This paper focuses on the effect of five variables on relative permeability: intrinsic permeability, pore-size distribution, viscosity ratio, interfacial tension, and wettability, by critically reviewing previously published relative permeability experiments. The wide variability in the functional relationship between relative permeability and saturation should be considered in attempts to model two-phase flow.     

RESISTANCE TO FLOW OVER RIPRAP IN STEEP CHANNELS1

ABSTRACT: A series of flume tests were conducted to determine the flow resistance of angular shaped riprap in steep channels. Flow resistance was expressed in terms of the Darcy-Weisbach friction factor and the Manning's roughness coefficient. Prototype channels of 4 ft. (1.2 m) and 12 ft. (3.7 m) in width were constructed at slopes ranging from 0.01 to 0.20. The channel beds were comprised of angular riprap of median diameters of 1, 2, 4, 5, and 6 inches (2.59, 5.59, 10.41, 12.95, and 15.75 cms). The Darcy-Weisbach and Manning's coefficients were determined for each test condition prior to bed failure. The resulting Darcy-Weisbach coefficients were related to the channel energy gradient and the bed relative submergence for highly turbulent flow. Also, Manning's roughness coefficients were related to the product of the median stone diameter and energy gradient. Because of the angular shape of the riprap and the wedging and/or packing of the bed materials, the resistance to flow was found to exceed the flow resistance values predicted by previous studies. Expressions were presented for estimating the resistance to flow for angular riprap in steep channels.     

诗词的旅游效应及相关旅游产品开发--兼论皖南贵池李白诗词旅游开发

中国古典诗词是中国传统文化的精髓之一,诗词作品及其作者是旅游区重要的旅游资源,能形成区域旅游竞争优势.诗词作品对旅游者能产生重要的导向作用,以诗词为旅游主线的旅游活动因为其较强的文化性越来越受到文化旅游者的欢迎.以皖南贵池为案例地,对贵池旅游区区内李白诗词旅游产品和线路等进行了分析和规划.     

Conservation of Biodiversity: How Are We Doing?

A question rarely raised in discussions on biodiversity conservation, but surely the biggest question of all, is “How much time do we have left before the mass extinction underway surpasses our best efforts to contain it?” This prompts a further prime question because—and unlike all other problems, whether environmental or otherwise—the biotic crisis threatens to leave a severely impoverished planet for millions of years ahead; “Why do we not undertake the necessary actions to get on top of the problem before it gets on top of us?”     

长江禁捕典型省域渔民生态种养采纳意愿及其驱动路径研究

当前,构建以渔民生态种养为主的生计转型长效机制,确保渔民“稳得住,能致富”是政府部门和学术界共同关注的重点。本文基于“生计恢复力”理论构建了“缓冲—自组织—学习”三维分析框架,借助必要条件分析（NCA）和模糊集定性比较分析（fsQCA）两种分析方法,从组态视角对长江退捕渔民生态种养采纳意愿的关键驱动条件、作用路径和潜在替代关系进行研究。研究发现：(1)NCA与QCA分析结果显示,单一条件无法形成渔民生态种养采纳意愿程度高的必要条件,但fsQCA组态分析显示,自组织能力尤其是对奖补惠及和政策新闻的关注能单独引致解释结果的产生。(2)渔民生态种养采纳意愿存在三种驱动路径,分别是自组织主导型、自组织—学习驱动型和缓冲—学习驱动型。同时,渔民生态种养采纳意愿存在三种抑制类型,分别是学习抑制型、自组织—学习抑制型及缓冲—自组织抑制型。(3)在特定条件下,自组织能力可以与其他两种能力的条件组合等效替代,以“殊途同归”的方式提升渔民生态种养采纳意愿。     

中美环境执法与经济处罚的比较分析

对中美环境执法的制度背景、实施以及经济处罚三方面进行了对比,结果发现,中国的环境执法尚有诸多需要进一步改进和改善的地方.通过比较,为中国的环境执法提供了一些参考建议,包括加强环境法制建设、增强环境法律的可执行性,加强国家环境保护总局的监督、协调与执法能力,加强环境执法机构建设和提高违法经济处罚额度等.      

Observations of nitrous acid and its relative humidity dependence in Shanghai

Nitrous acid, HNO2, is an important precursor of OH radicals in the troposphere. Measurements of HNO2 and NO2, using differential optical absorption spectroscopy （DOAS）, were performed in Shanghai, China for a period from October 22, 2004 to January 4, 2005. The mean （and median） hourly concentrations of HNO2 and NO2 during this period were 1.1 （0.7） ppb and 24 （21.4） ppb respectively. A correlation between HNO2/NO2 and PM10 mass concentrations was obtained. This correlation suggests that significant heterogeneous chemical production of HNO2 may occur through NO2 reactions on aerosol surfaces. This hypothesis was further supported by detailed analysis of selected pollution episodes in this study. At the same time, the water dependence of HNO2 formation was studied by analysis of relative humidity （RH）. It showed that the maximum HNO2/NO2 ratio was increased along with RH below 70% and inhibited at RH〉70%.     

黄河流域区域发展优势与经济带生成可能

基于进化经济学和进化经济地理学的理论,文章重点讨论了黄河流域的区域发展优势和建成黄河流域经济带的可能性。研究从黄河流域发展的历史出发,论证了黄河流域经济发展的区域地理学本性(nature)条件和现实可能性:第一,黄河流域经济发展的区域地理学本性条件是,该区域已经完成了农业经济建设,出现了遍在性的工业化和经济区人口聚集,特别是经过长期聚集,黄河流域已经形成了中国的人口密集带,形成了具有区域发展优势的中原城市群。第二,在分析黄河流域区域发展优势基础上,提出建成“大中原-黄河经济带”的可能性及其发展途径,即在生态保护的前提下,坚持地理环境的鲁棒性建设,坚持城市创新发展,坚持发展新型产业。第三,地区发展政策重点应该关注中原城市群的工业化-城市化发育和一体化产业链的形成,根据新经济地理学理论,提倡城市产业专业化方向,打破省界限制,发挥经济区的地缘结构优势,在空间上与环渤海经济带融合,完成黄河流域经济带高质量发展的战略构想。