基于Memetic算法的两级车辆路径优化

针对传统两级车辆路径优化过程,存在的精度不高,收敛时间过长的问题,提出一种基于Q学习理论和差分进化的Memetic算法。首先,对两级车辆路径优化问题进行研究,利用最优分割法获得第一级配送方案,以此确定中转站配送数量,然后求解第二级多配送中心车辆路径问题配送方案,获得两级优化问题的总里程及总配送车辆数量;其次,针对第二级MDVRP配送方案求解,利用Q学习理论和差分进化算法,设计新的Memetic算法,来实现对多配送中心车辆路径问题配送方案的全局优化;最后,通过仿真验证了所提算法的有效性。     

共享经济下人车货路径匹配优化问题研究

针对网约车运力资源剩余与物流末端配送即时性不足间的矛盾,以多方参与主体总利益最大化为优化目标,构建网约车、乘客与快递联合配送车辆路径匹配优化模型.根据车辆路径匹配优化问题的NP-hard特性,运用插入启发式算法构造种群初始解,设计了一种适于求解全局优化问题的改进型混合遗传算法.仿真实验表明:该模型能在有效减少车辆总行驶里程的同时提升多方主体的利益.对比实验证明了提出的混合遗传算法不仅能够解决易陷入局部最优的弊端,而且还提高了求解问题的全局寻优能力及运行速度,为网约车的剩余运力资源利用及物流末端配送路径优化提供了新的解决思路.     

基于PSO-VNS算法的质押物配送路径研究

【目的】质押物配送是物流金融中存货质押融资业务的重要流程。优化质押物配送路径可以节省配送时间,减小质押物在途风险以及运输成本。【方法】以配送质押物的车辆运行总距离最小为目标,将其转化为带距离和容量约束的车辆路径问题(DCVRP),建立数学模型。针对粒子群算法(PSO)的优缺点,设计用于求解该问题的混合变邻域搜索粒子群算法(PSO-VNS)。【结果】利用该算法求解应用实例,与基本粒子群算法对比求解的算法收敛过程和所得配送路径方案。【结论】通过实例研究表明,所改进的PSO-VNS算法能够快速跳出局部收敛,其全局寻优能力得到改善,且收敛速度更快,能够较好地为质押物配送路径问题提供解决方案。     

基于PSO-VNS算法的质押物配送路径研究

【目的】质押物配送是物流金融中存货质押融资业务的重要流程。优化质押物配送路径可以节省配送时间,减小质押物在途风险以及运输成本。【方法】以配送质押物的车辆运行总距离最小为目标,将其转化为带距离和容量约束的车辆路径问题(DCVRP),建立数学模型。针对粒子群算法(PSO)的优缺点,设计用于求解该问题的混合变邻域搜索粒子群算法(PSO-VNS)。【结果】利用该算法求解应用实例,与基本粒子群算法对比求解的算法收敛过程和所得配送路径方案。【结论】通过实例研究表明,所改进的PSO-VNS算法能够快速跳出局部收敛,其全局寻优能力得到改善,且收敛速度更快,能够较好地为质押物配送路径问题提供解决方案。     

基于PSO-VNS算法的质押物配送路径研究

【目的】质押物配送是物流金融中存货质押融资业务的重要流程。优化质押物配送路径可以节省配送时间,减小质押物在途风险以及运输成本。【方法】以配送质押物的车辆运行总距离最小为目标,将其转化为带距离和容量约束的车辆路径问题(DCVRP),建立数学模型。针对粒子群算法(PSO)的优缺点,设计用于求解该问题的混合变邻域搜索粒子群算法(PSO-VNS)。【结果】利用该算法求解应用实例,与基本粒子群算法对比求解的算法收敛过程和所得配送路径方案。【结论】通过实例研究表明,所改进的PSO-VNS算法能够快速跳出局部收敛,其全局寻优能力得到改善,且收敛速度更快,能够较好地为质押物配送路径问题提供解决方案。     

基于PSO-VNS算法的质押物配送路径研究

【目的】质押物配送是物流金融中存货质押融资业务的重要流程。优化质押物配送路径可以节省配送时间,减小质押物在途风险以及运输成本。【方法】以配送质押物的车辆运行总距离最小为目标,将其转化为带距离和容量约束的车辆路径问题(DCVRP),建立数学模型。针对粒子群算法(PSO)的优缺点,设计用于求解该问题的混合变邻域搜索粒子群算法(PSO-VNS)。【结果】利用该算法求解应用实例,与基本粒子群算法对比求解的算法收敛过程和所得配送路径方案。【结论】通过实例研究表明,所改进的PSO-VNS算法能够快速跳出局部收敛,其全局寻优能力得到改善,且收敛速度更快,能够较好地为质押物配送路径问题提供解决方案。     

多集散点车辆路径优化的混合算法

为使多集散点车辆路径优化结果全局最优,以订单为基准建立多集散点车辆路径优化模型.采用粒子群算法与改进蚁群算法组成的混合优化算法求解模型.由粒子群算法的粒子位置向量得到每辆车所需运送的订单号,用蚁群算法优化单车路径,根据优化的总路径评价和筛选粒子,直到满足终止条件.该模型和混合算法是所有车辆对所有订单节点的路径优化,突破了多仓库问题直接或间接转化为多个单仓库车辆路径优化问题中的局部节点求解的限制.实例求解结果表明,用该混合算法优化的车辆总路径长度小于用蚁群算法求得的结果.     

武汉市烟草配送路径及运力优化

根据烟草产品特点,针对武汉市现有的配送体系和地理特点,建立了配送路径及运力优化方案数学模型,并确定了配送路径优化设计静态和动态约束条件,所涉及到的问题是带有时间限制和车辆载荷限制的车辆路径问题.其解决方案是采用二阶段算法对配送路径进行先排线路再分组法,并应用带有载荷约束的单巨集切割法,将大规模VRP问题分为线路划分和单车线路优化2个子问题,有效地解决了配送路径和运力优化问题.并通过案例对模型和解决方案作了进一步分析验证.     

适于配送车辆导航路径规划的改进型粒子群优化算法

路径规划在车辆导航系统中具有举足轻重的作用,是配送车辆导航系统中的一个重要的模块。为解决物流配送车辆导航中的路径规划问题,文章以点对点模型为基础,对基本粒子群优化算法在初始种群的产生方法和种群的进化策略方面进行改进,提出适于配送车辆导航中路径规划点到点模型的改进型粒子群优化算法,并通过仿真试验验证算法的有效性。结果表明该算法具有快速的运算能力和较好的收敛性。     

基于混合遗传算法的应急物资配送路径优化

为解决突发事件下应急物资的配送路径优化问题,以配送车辆的固定成本、运输成本、违反最大载重量以及右时间窗的惩罚成本之和最小为目标,构建了带时间窗约束的应急物资配送路径优化模型;通过将遗传算法与节约算法、大规模邻域搜索算法相结合,设计出了一种混合遗传算法对模型进行求解;最后用算例仿真验证了模型和算法的可行性。实验结果表明:设计的混合遗传算法在求解过程和求解结果上都比标准遗传算法更优,可见能够为解决应急物资的配送路径优化问题提供科学的决策依据。     

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.     

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.     

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.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

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

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.