基于可拓云模型的区域生态安全预警模型及应用-以垫江县为例

为了了解垫江县生态安全状况,建立了生态安全评价与预警模型。基于压力、状态、响应框架模型构建生态安全预警指标体系,采用主客观综合赋权法确定指标权重,并基于可拓云模型建立了区域生态安全预警模型。评价垫江县2005-2015年的生态安全,并对其2020年的生态安全进行预警。结果表明：(1)2005-2015年垫江县总体生态安全水平较高,2008-2010年、2012-2015年皆处于蓝色预警状态,但发展趋势呈下滑状态;(2)在影响垫江县生态安全的指标中,人均GDP、建成区绿化覆盖率保投入强度、万人拥有医院床位数的变化最为剧烈;(3)预测2020年垫江县的生态安全处于为黄色预警状态,人口和环保投入强度将成为影响垫江县生态安全的主要因素。可见生态安全评价与预警能为垫江县的生态工程建设提供决策参考,对垫江县生态安全的维护具有重要意义。     

基于IAHP和模糊综合评判的企业安全风险预警系统研究

为有效控制企业安全生产风险，实现安全风险早期预警，基于理论及企业安全管理体系研究，确定了安全风险预警评价指标，采用区间层次分析法（IAHP）计算指标权重，确定了预警监测关键点，并运用模糊综合评判法构建作业现场安全风险预警评价模型与评价思路。研究结果表明：区间层次分析法和模糊综合评判法能够较好地对作业现场安全风险进行评估；该风险预警系统能够实现企业安全风险的量化评估，确定风险预警等级。实例分析结果与实际情况基本相符，表明本文风险预警系统能够为企业安全风险水平的管控提供指导。     

基于因素-时间变权模型的公路隧道群运营期安全性评价研究

公路隧道群运营期安全保障工程相较于单体隧道更为复杂,面临的大量不确定性和安全风险直接威胁着隧道安全运营。从“人-车-隧道-交通环境-管理”五个要素构建运营安全评价因子集,结合变权理论对开展动态评价研究,形成因素-时间变权方法的双动态权重计算模型以体现指标的时变特点,结合模糊综合评价模型进行等级评价,以某高速隧道群开展评价工作。通过上述研究表明：因素-时间变权模型对于运营期的隧道群安全评价指标的权重控制具有极强的针对性,能很好的弥补常规评价方法中对隧道运营期安全因时变性的特点造成的评价结果失真的缺点;变权理论的利用为开展风险的动态管控提供了重要的理论支撑。     

基于TOPIS最优的资源环境承载能力预警判别与趋势预测

以安徽省为例,运用突变级数法,对资源环境承载能力进行了综合评价;采用TOPIS多目标决策最优方法,对资源环境承载能力最优值进行了测算;基于偏离度模型,构建了预警判别体系;运用灰色GM(1,1)模型,对资源环境承载能力预警演化趋势进行了预测.结果表明:①资源环境承载能力综合指数由2005年的0.386 8提升至2015年的0.873 1,年均增长8.48%;②研究期间,资源环境承载能力偏离度指数处于0.23～1.17之间,均值为0.66,整体处于橙色预警状态;③经济社会若按既有发展模式,至2020年资源环境承载能力偏离度指数将达0.45,预警等级为黄色,生态文明建设与可持续发展将面临较大压力,全面建成小康社会与美丽安徽建设目标将面临较大挑战.     

改进集对分析模型在公务航空运行控制风险评价中的应用

为进一步研究公务航空运行中存在的安全问题,查找公务航空公司存在的安全风险从而对安全风险进行防控,通过将熵权法和集对分析相关理论相结合,构建集对分析模型,对某公务航空公司运行控制进行风险等级评估。首先,确定公务航空运行控制安全风险指标体系,运用熵权法在降低主观因素干扰下确定安全风险指标的权重大小,考虑各风险评价指标之间的不确定性,构建改进集对分析模型,以结合公务航空运行特点,建立风险指标与风险等级之间的集对关系,根据2014-2018年该公务航空公司的运行情况,进行综合评估。结果表明：该公务航空公司2014-2015年风险等级为II级,2016-2017年风险等级为III级,2018年风险等级为II级,明确风险发生趋势,为进一步的安全风险管控提供基础和依据。     

中国油气资源安全从本地保障到全局保障

首先综述了中国能源消耗现状和发展趋势,由于中国目前的化石能源供给有限,无法满足中国现在和未来的需求缺口,天然气、石油供给在很大程度上将依赖进口,最后总结亟需解决中国在一定时期内石油、天然气对外依存度较低的问题。进一步提高中国油气的对外依存度,既具有内部的可容性条件,也具有外部的可容性条件。世界上许多国家都有很高的对外依存度,特别是在当前的条件下,油气对外依存度并不构成国家能源安全的一个重要条件。中国应该转换思路,从局部的油气资源安全保障,转换到区域,乃至全球的油气资源安全保障上来。通过"一带一路"、互联互通,把眼光从局部,转移到区域和全球,以区域和全球的油气资源安全保障来解决局部油气安全保障的问题。     

城市轨道交通网络运营安全的综合评估

运营安全评估是保障轨道交通网络化安全运营的关键环节之一.基于熵权可拓物元模型提出了一种轨道交通线网运营安全评价的方法.该方法通过统计分析轨道交通线网历史运营情况,构建运营安全评价指标体系;利用数理统计划分评价指标的经典域;利用熵权模型计算指标权重;并利用可拓物元模型计算轨道交通线网的综合评价值和风险等级.研究结果表明,所构建的轨道交通线网运营风险评估的指标体系切实可行,基于熵权可拓物元模型提出的评价方法能客观有效地评估线网的运营风险.     

基于博弈论组合赋权云物元模型的城市道路交通系统风险评价

为保障城市道路交通系统安全运行,降低城市交通事故发生概率,提出一种基于博弈论组合赋权云物元城市道路交通系统风险评价模型。从城市道路交通系统风险因素出发,结合《城市道路交通管理评价指标体系》,选取实习期驾驶员比例等15个风险评价指标,构建“人-车-道-环”评价指标体系。基于云物元模型,解决评价指标中存在模糊性与随机性的问题,同时采用博弈论将C-OWA有序加权算子处理的专家打分值和改进熵权法求出的权重进行组合优化,围绕待评物元与风险等级之间的隶属度,计算得出风险等级。将该模型应用于我国西部某城市A道路交通系统,展开风险评价,同时将该模型的评价结果与C-OWA云物元模型和熵权云物元模型的评价结果进行对比。结果表明:该模型得出城市A道路交通系统中各指标风险评价结果与实地走访调研结果及实际情况基本一致,且博弈论组合赋权云物元城市道路交通系统风险评价模型更加具有实用性和有效性,可为城市道路交通系统风险评价提供新思路。     

基于PSR-模糊综合评价方法的天津市水环境安全评价

为准确评估天津市水环境安全,建立压力-状态-响应(pressure-state-response,PSR)模型,共选择25项评价指标,创建健康评价指标体系,运用模糊综合方法对天津市2012-2018年水环境进行安全评价.结果 表明,天津市水环境安全等级2012-2017年处于第Ⅲ级,2018年处于第Ⅱ级,总体安全状况呈...     

模糊综合评价法在生态安全预警评价中的应用——以河北省围场县为例

基于2003-2012年围场县的经济、水环境、土地资源、自然资源等相关数据,运用P-S-R模型从压力、状态、响应3方面构建围场县生态安全预警指标体系,采用模糊评价法并结合预警指数和警度标准对2003-2012年围场县生态安全警情状况进行分析。结果表明,2003-2012年围场县生态安全预警指数总体上呈波动上升态势,预警指数由2003年的5.278 1上升到2012年的6.809 1,处于"轻警"状态,趋于预警状态。就压力、状态、响应各子系统而言,2003-2012年围场县生态安全的压力指标、状态指标和响应指标的预警指数呈上升趋势,发展趋势良好。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with