基于遗传算法的冷链物流智能监测及预警

针对水产品冷链物流运输过程中保鲜程度智能监测及预警问题,提出了一种基于改进遗传算法的水产品冷链物流保鲜程度智能监测及预警方法.该方法首先针对传统遗传算法自定义了交叉和变异的应用概率,增加了算法的收敛速度,将改进的算法应用于特定温度下的冷藏车中,推导时间与水产品腐败释放气体的函数关系,建立腐化方程,并在实际运输中,实时监测产生的气体与时间之间的函数关系,并在异常情况下进行报警.     

福建省水产品冷链物流网络布局优化模型的构建

针对福建省水产品冷链物流网络布局优化高发散性问题进行探究,将福建省水产品冷链物流网络布局优化问题进行抽象、概化,将福建省水产品冷链物流网络布局优化问题转化为特定条件下数学方程最优化问题,并结合混合蛙跳算法对该数学方程最优化问题进行解答,同水产品冷链物流网络布局优化算法进行比较,从计算耗时、优化结果的角度进行分析.结果显示:混合蛙跳算法在计算效率上远远高于其他方法,求解的优化方案每月成本更低,说明本文方法计算结果更加精确,计算流程更加优化.     

福建省冷链物流发展现状与问题研究

随着经济社会的发展,消费者对物质生活需求越来越高,对食品药品的安全问题提出了更高的要求和挑战。本文从果蔬、水产品、冷冻食品、乳制品和医药五个冷链物流产业为切入点,探讨福建省冷链物流发展现状和存在的问题,为福建省冷链物流发展提供依据。     

舟山某水产品冷链物流园规划布局探究

采用液化天然气(LNG)作为冷源,运用系统布置设计SLP法,根据各功能区之间的联系密切程度,对舟山某水产品冷链物流园各功能区的物流关系和非物流关系进行定性定量分析,确定各功能区综合相互关系。同时综合区位、交通、环境等因素全面分析,减少园内不合理的工作流程和迂回的工作动线,确定园区功能布局,为其他水产品冷链物流园的规划布局提供理论参考与借鉴。     

我国生鲜产品电商冷链物流的应用研究

目前,我国生鲜产品电商以及冷链物流迅速发展,如何减少物流运输配送中生鲜产品的损失和损耗,满足专业化需求和保证产品质量,提高出口竞争力成为生鲜产品电商企业应用冷链物流的研究课题,基于我国生鲜产品电商企业应用冷链物流硬件设施设备的现状与情况,从加快建设冷链物流基础设施,提高冷链物流技术水平,建立完善的体系,加大对企业的扶持力度以及大力培养专业型综合性人才,完善相关的国家政策等多个方面提出了加快生鲜产品电商企业冷链物流应用的对策和建议。     

我国冷链物流园区发展

冷链物流园区作为专业从事冷冻加工、冷藏储藏、冷藏运输及配送、冷冻销售为一体的大型综合性的物流功能区,在国内存在着很大的发展空间。本文结合现阶段我国冷链物流发展环境,探讨了构建冷链物流园区的必要性,分析了我国冷链园区存在的问题,探讨如何逐步构建完善的冷链物流园区,并提出了我国冷链物流园区的目标和原则。     

食品冷链物流与技术管理的规范化运营

在食品的物流运输工作中,我国已经具备了较为完善的冷链物流技术,能够提升物流效率及运输品质。不过,在实际的物流运营管理工作方面,还存在一些问题需要解决,比如资金技术投入及运营管理方面的问题。为了推动食品物流行业的可持续发展,该文主要结合实际存在的问题以及冷链物流的工作流程分析提高运营管理规范性的可行措施。     

农产品冷链物流增值创造问题研究

经济的持续增长和生活水平的不断提高推动了农产品冷链物流的快速发展,人们对农产品消费的数量和结构在不断变化,对于生鲜农产品需求日益增加,结构更加多元,这对冷链物流技术在我国的快速发展提出了更高要求。冷链物流在农产品生产、加工、储存和运输过程中,主要通过三个途径来提升其价值增值:降低物流成本和商品价格、实现服务创新和树立品牌形象。在该文中,该研究者深入分析农产品冷链物流实现价值增值和价值创造的途径,针对如何发展农产品冷链物流以及如何推动增值创造的实现提出了可行建议,这些建议包括:提升农产品生产和储运的组织化程度、充分利用超市的物流体系、发展第三方冷链物流等。     

医药疫苗冷链物流监控系统的设计与实现

近年来,医药疫苗冷链物流的安全和全程可追溯越来越受到人们的关注,但是关于医药疫苗冷链物流过程中的温控和定位相关的研究与应用还比较少。该文研究设计一个医药疫苗冷链物流GPS可追溯系统,系统能够确保疫苗产品的运输安全,保证终端用户安全使用,确保人民的生命财产安全。     

信息化开创生鲜食品冷链物流新时代

生鲜食品作为食品行业的重要组成部分,需要通过对其来源、生产、包装、检验、监管、运输、消费等各个环节的全程连接,建立食品安全信息数据库,打造"从种养到餐桌"的全产业链条,实现食品安全从终端向源头的完全透明可追溯.生鲜食品冷链物流信息化对于食品安全有着重要的意义.如今,冷链食品物流体系渐渐摆脱落后的局面,可以说,信息化为生鲜食品冷链物流开创了一个新时代.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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