武汉市城郊农业的经济分析

根据我国大城市城郊农业的一般经济特征，分析了武汉市城郊农业的功能，特征及其发展的支撑条件和制约因素，并针对其未来发展提出了若干对策。     

平顶山市城郊农业发展初探

通过对平顶山市城郊农业现状的分析，针对目前存在的主要问题，提出了发挥区位扰势，控制人口增长，合理利用土地资源，调整农业生产结构，实现城郊农业可持续发展的有效措施和途径     

基于空间句法和网络分析的武汉市城郊休闲农业点空间可达性研究

休闲农业是乡村旅游发展的重要载体，其可达性水平直接影响着乡村旅游的可持续发展.基于此，论文以武汉市城郊368个休闲农业点作为研究对象，在空间句法方法的基础上，借助网络分析方法，构建空间句法模型和空间关联性网络模型，从全局通达性、局部关联性两个方面对武汉市城郊休闲农业点的空间可达性进行研究，以揭示武汉市城郊休闲农业点的布局特征与空间关联性.结果发现： 1) 武汉市城郊休闲农业点整体密度核心分布较为分散，空间呈现群聚式非均匀分布在武汉市绕城高速周边，形成了绕城高速休闲农业点分布带； 2) 从路网全局通达性来看，武汉市城郊休闲农业点多分布在2级可达性道路300 m缓冲区范围内，且此道路等级缓冲区范围内的农庄经济型休闲农业点可进入性较好，对外通达性一般； 3) 从路网局部关联性来看，区域间休闲农业点内部联系“西密东疏”，东西湖区与黄陂区、蔡甸区休闲农业点联系较为密切；区域内休闲农业点内部关联性差异明显，高速公路、国道沿线区域的休闲农业点关联性普遍较强.     

兰州市生态环境及其调控研究

对兰州市生态环境问题及其形成发展原因进行了综合分析研究，探讨了调控方针策略，进而提出了调整产业结构与布局，全面治理污染，调整大农业结构，发展优质高效的城郊集约型农业，依法管理和保护生态环境，促进区域可持续发展，确保生态环境良性循环的具体实施．     

韶关市城郊农业可持续发展对策探讨

城郊农业具有四大优势和四大功能,不仅有利于实现农业产业化、生态化和现代化,还有利于城市经济建设和市民生活质量的保障。韶关城郊农业发展虽存在一些问题,但可通过强化政策与资金保障、坚持统筹规划、加强城郊生态建设、提高农民科技水平、发展“绿色食品”工程等措施,而增强韶关城郊农业的可持续发展能力。     

城郊休闲农业游客重游行为影响因素的实证研究——以合肥市城郊休闲农业为例

重游率是城郊休闲农业的生命线,研究影响城郊休闲农业游客重游行为的动因和因素是提高重游率、健康发展观光休闲农业的重要途径。通过对合肥市城郊休闲农业游客进行调查访问,运用SPSS 17.0软件对调查结果进行统计分析,结果表明,游客偏好、休闲农业产品固有质量、休闲农业接待条件以及旅游环境存在的替代点是影响城郊休闲农业重游行为的主要因素和内在动力,并在此基础上提出提高游客重游率的建议。     

郑州市城郊农业旅游开发探析

城郊农业旅游拓展了旅游资源的开发形式,促进当地经济发展,针对郑州市城郊农业旅游具有得天独厚的区位、资源和市场优势。本文针对郑州市城郊农业旅游存在的问题,提出了一系列开发对策。     

秦皇岛市城郊农业产业化的探讨

结合秦皇岛市城郊农业产业化的实践,探讨了城郊农业产业化的基本思路,提出了在城郊农业产业化运作中要解决的３个问题,即跳出城郊抓基地,围绕产业化抓服务,围绕销售抓市场。     

城市中大气环境质量的某些影响因素研究

本文采用多对多双重逐步回归分析方法和数量化理论对浙江省某大城市大气中ＳＯ２、ＮＯｘ、总悬浮颗粒（ＴＳＰ）的含量随城市五大功能区和四季变化进行了计算和分析．结果表明城郊大气质量明显好于城区，但城区大气污物含量各区基本一致．大气质量变化受季节影响显著．其污染程度由重到经依次排列为：冬季＞秋季＞春季＞夏季．     

立足城郊区位优势 搞好农业结构调整——对榆次区种植业结构调整的调查

近年来，榆次区立足城郊区位优势，走出了一条具有城郊特色的种植业结构调整新路子。该区农技部门的推广重点实现了3个转型，立足资源优势推出了优势产业。拓宽了农业产品销售渠道，但仍存在订单农业不规范及优质不能优价等问题。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the