基于两阶段聚类的电动自行车出行者选择研究

为了得到准确的电动自行车差异化管理量化决策,本文根据2014年南宁市调查数据,基于两阶段聚类方法,对电动自行车出行者进行差异化分类,在此基础上构建南宁市电动自行车与公交车之间的出行方式选择BNL(binary-nomial logit)模型,并运用SPSS 22.0对模型参数进行标定;最后结合南宁市实际情况对模型结果进行分析。本文研究结果表明:在公共交通缺乏或服务水平不高的条件下,电动自行车是中低收入居民主要的通勤出行方式之一;在提高常规公共交通服务水平的情况下,不分类模型有可能高估常规公交的分担率提高程度,分类模型能更有效地反映不同人群的差异性。本文提出的方法能为探讨南宁市电动自行车差异化管理策略提供更准确的量化决策支持。     

公交发车频率优化研究

公交运营调度是公交行业运营管理的重要步骤,规划合理的行车时间对提高公交的承载率至关重要。本文以企业与乘客两个方面建立公交车发车频率的多目标优化模型,采用遗传算法,用matlab编程求解,并将人工制定方案与本文制定方案在高峰期、平峰期两个时间段的平均发车间隔进行比较。结果表明本文的计算方法性能更优,在满足乘客需求的同时也为公交运营公司提供决策支持,具有较好的应用价值。     

长沙县公交规划客流预测与TransCAD应用

介绍了长沙县公交规划客流预测的方法,并以此项目为依托,阐述了TransCAD软件在公交规划中的应用步骤。     

基于OLI影像的植被覆盖信息提取技术研究 ——以南宁市邕宁区为例

文章以2017年10月28日南宁市邕宁区Landsat 8 OLI影像为数据源，利用ENVI5.3和ArcGIS10.2软件进行数据处理，将原始波段组合、主成分分析组合、衍生波段组合影像用极大似然估计方法进行监督分类，提取南宁市邕宁区的植被覆盖信息，并将分类结果在分类总体精度上相互对比，在空间和提取得到的植被面积数据上对比目视解译结果和南宁市统计年鉴提供的数据，最终确定提取植被覆盖信息的最佳波段组合。研究表明衍生波段组合提取的结果能较准确地反映南宁市邕宁区地表植被覆盖情况，为南宁市邕宁区绿地系统规划提供了参考。     

地理信息大数据安全保障研究

地理信息数据是一种基础性和战略性资源,多源海量的地理信息数据借助大数据分析技术可以挖掘出巨大价值。但地理信息大数据面临多种安全威胁,可能威胁我国的国家安全和社会稳定。现有针对地理信息大数据的安全保护研究多关注安全技术,缺乏地理信息大数据安全管理和安全保障的研究,一个完整的地理信息大数据安全保障方案应该是安全技术和安全管理并重。本文在分析了地理信息大数据面临的各种安全威胁后,提出了一个地理信息大数据安全保障框架,从安全管理保障、技术保障、工程保障和组织保障等四个方面来实施地理信息大数据安全保障工作,该安全保障框架可以指导地理信息大数据应用建设者和运营者提升地理信息大数据系统建设和运营过程中的安全保障能力。同时,为落实地理信息大数据安全保障框架,提出了一个配套的地理信息大数据安全标准框架,旨在以安全标准为抓手,切实推动我国地理信息大数据安全保障工作,为我国地理信息产业的健康发展打好坚实基础。     

公交出行换乘时间模型及时间阈值研究

针对利用公交出行换乘时间阈值可更加准确区别换乘行为和二次出行行为,提高利用公交IC卡数据自动提取公交换乘时间方法的精确性,进而提升城市交通的整体规划和公交整体服务水平. 通过实际调查,首先对公交出行换乘方式进行了分类,分析了各类公交出行方式的换乘时间影响因素及其影响机理. 在此基础上从微观的角度建立了公交出行时间与各影响因素之间的关系模型,并通过实际调查数据验证了该模型的准确性,应用公交出行换乘时间模型得到了基于GIS公交网络要素分类的各类换乘方式的公交换乘时间阈值.     

GIS软件在小流域规划和管理中的应用初探

方正智绘和MapInfo是名的地图数字制图和地理信息管理软件，介绍了二在小流域规划和管理中的初步应用，并对其存在的问题和发展趋势进行了探讨。     

南宁市城郊结合部地域范围界定研究

该文以2006年LANDSAT-5卫星获取的TM影像为基础数据源,在ARCGIS和ENVI软件的支持下,应用景观紊乱度模型,分析熵值分布特点,以建成区边缘为内边界,以景观紊乱度值0.4为域值确定外边界,最终确定南宁市城郊结合部范围及各乡镇与城郊结合部的归属关系,为南宁市规划部门及管理部门提供科学依据.     

城市地理信息的分类与编码研究

城市地理信息分类与编码是城市地理信息数据生产的基础,笔者基于多年从事相关工作的经验,提出了一整套城市地理信息的分类编码的方法,论文首先探讨了地理信息分类与骗码的内容,而后分析了分类与编码的原则,最后给出了具体的分类与编码方法,全文层层推进,逻辑填密,相信对从事相关工作的同行有着重要的参考价值和借鉴意义。     

地理信息大数据安全保障模型和标准体系

地理信息数据是一种基础性和战略性资源,多源海量的地理信息数据借助大数据分析技术可以挖掘出巨大价值。但地理信息大数据面临多种安全威胁,可能威胁我国的国家安全和社会稳定。现有针对地理信息大数据的安全保护研究多关注安全技术,缺乏地理信息大数据安全管理和安全保障的研究,一个完整的地理信息大数据安全保障方案应该是安全技术和安全管理并重。在分析了地理信息大数据面临的各种安全威胁后,提出了一个地理信息大数据安全保障框架,从安全管理保障、技术保障、工程保障和组织保障4个方面来实施地理信息大数据安全保障工作,该安全保障框架可以指导地理信息大数据应用建设者和运营者提升地理信息大数据系统建设和运营过程中的安全保障能力。同时,为落实地理信息大数据安全保障框架,提出了一个配套的地理信息大数据安全标准框架,旨在以安全标准为抓手,切实推动中国地理信息大数据安全保障工作,为中国地理信息产业的健康发展打好坚实基础。     

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