孪生数据驱动的绿色切削工艺优选决策

为了快速优选低碳且具有环境友好性的绿色切削工艺,提出了一种孪生数据驱动的绿色工艺优选决策方法。首先,建立了数字孪生驱动的切削加工工艺优选决策流程;其次,以加工质量、加工时间、加工成本、资源消耗、环境影响为一级评价指标,建立了绿色切削工艺优选评价指标体系;再次,采用网络层次分析法对评价指标进行权重计算,并基于概率犹豫模糊理想值法及孪生数据对备选的绿色切削工艺进行优选决策;最后,以某航空企业的叶片加工工艺优选为例进行实例验证。结果表明：该方法能够充分利用数字孪生车间的仿真预测、历史数据挖掘、实时采集等功能,以孪生数据的形式为工艺评价提供全面的数据源;同时所建立的评价决策模型实用性较强,符合现实的切削工艺优选决策场景,模型求解方法鲁棒性好。     

面向低碳的车间生产过程数字孪生建模

智能制造关键技术的不断突破及其在制造业的快速应用极大地改造着传统车间的生产模式．现代企业的生产方式逐渐朝着集成化、复杂化和智能化方向发展,给车间生产过程低碳运行目标带来挑战．为了提高车间生产过程能耗管理的质量与实时性,提出了一种面向车间能耗管理的数字孪生建模方法．基于物理生产车间的生产资源与车间布局方案搭建虚拟生产车间,通过物理与虚拟车间设备运动信息的交互为几何模型添加运动关系,并结合生产节拍建立车间运动规律的数字孪生模型;采集单机物理生产设备随加工参数变化的能耗数据,使用BP神经网络建立多设备的能耗模型,基于获取物理与虚拟车间实时交互的能耗数据建立车间能量流动规律的数字孪生模型．最终实现包含动态能耗信息的车间生产过程数字孪生建模．同时基于该数字孪生模型提出了一种面向车间生产过程的能耗优化方法,结合刀具寿命、机器人运动平稳性、生产时间等多源评价指标建立多目标优化函数,获取数字孪生模型中的动态能耗数据并应用蜂群算法实现对车间低碳生产需求下的多设备加工参数协同优化．最后以给定工件的生产过程为例,对所提数字孪生建模方法和建模效果进行验证,实验结果表明借助该数字孪生模型环境下的生产过程优化方案...     

犹豫模糊语言多属性决策灰关联分析方法及其应用

以区域金融生态环境评价问题为研究对象,提出一种新的融合方法;针对犹豫模糊语言术语集,结合灰色关联分析理论,提出犹豫模糊语言灰色关联度的概念,并基于离差最大化原理给出最优化模型,对各属性进行客观赋权;最后用实例验证了其有效性和可行性,突破了传统的灰色关联分析法应用于区间属性的决策问题,研究了更模糊且更贴近现实的语言评价环境,该方法不仅能够充分利用原始评价数据,且能减少不必要的信息损失。     

基于区间犹豫模糊偏好关系的多属性决策方法

在现有的区间偏好关系和犹豫偏好关系基础上,首先定义了具有专家犹豫优先度的乘 性一致性区间犹豫模糊偏好关系,并提出了其一致性和评价对象优先权重之间的关系;其次,基于 模糊决策思想,建立线性规划模型,求出对应评价对象的区间权重向量;最后将模型应用于实例 中,说明其可行性。     

基于改进隶属度函数的电能质量模糊综合评价

通过分析电能质量模糊综合评价中的隶属度函数问题,提出了一种改进的隶属度函数来量化刻画电能质量评价指标各质量等级的模糊特性,从而实现更为细致的电能质量的模糊综合评价,解决了电能评价指标两质量等级之间难以建立联系和量化刻画的问题.文中首先对电能质量指标的权重、确定隶属度函数参数的指标限值及质量等级划分问题进行了分析;然后以传统的岭形函数为基础进行改进,得到基于评价指标质量等级的隶属度函数,并对电能质量的各项评价指标建立了模糊模型;最后运用所设计的算法对某地区的电能质量数据进行评价,结果验证了文中方法的实用性和有效性.     

建筑火灾风险评价中定性指标的模糊灰色评价方法研究

对建筑火灾风险评价中的定性指标进行量化时,其评判信息具有模糊性和灰色性。根据模糊灰色理论,提出了对建筑火灾风险评价中的定性指标进行量化的灰色评价方法,建立了建筑火灾风险模糊灰色综合评价模型。通过实例,对建筑物防火安全管理中的定性指标进行了量化,并评价了其防火安全管理水平。该方法将为评价建筑物的防火安全性提供了更客观的技术手段。     

高校学报核心竞争力评价研究

模糊层次分析法是将层次分析法和模糊综合评价法的优点进行有机融合,用层次确定各影响因素的权重,用模糊综合评价法确定各方案指标,对评价进行量化。建立了高校学报核心竞争力评价模型,并用实例验证了模型的有效性。     

数控装备质量的模糊物元综合评价方法

针对数控装备质量多层次指标评价问题,提出了一种基于模糊物元模型的综合评价方法。该方法利用模糊物元理论分析多个质量特性及其属性特征,并建立了数控装备质量综合评价模型。采用层次分析法和信息熵确定评价指标权重,建立基于最小二乘法的优化组合权重模型计算组合权重,并运用模糊物元法给出评价结果。实例研究表明该方法可行、合理。     

基于犹豫模糊集的移动式压力容器充装站应急预案评价体系

为科学客观地评价移动式压力容器充装站应急预案的质量，提高充装站应急处置能力，基于现有应急预案规章制度，构建了移动式压力容器充装站应急预案质量分级指标体系并建立了应急预案质量等级评价模型。移动式压力容器充装站应急预案质量分级指标体系包括了5个二级指标和27个三级指标。应急预案质量等级评定模型以犹豫模糊集理论为基础，将应急预案质量划分为5个等级。该评价模型采用集值迭代法计算各指标权重，并结合HFWA算子计算各指标的最终犹豫模糊得分。将该模型应用于浙江省某天然气有限公司突发事故应急预案，根据模型计算最终得分结果，将该公司应急预案质量等级定为“良好”，验证了该模型的可行性。     

基于犹豫模糊软集的专利质量评价模型

现有的专利质量评价方法以专家打分为主,需要专家对所评专利的全部指标给出一个评价值,并根据指标的相对重要程度分配权重值。但指标体系涉及不同领域的多个指标,专家对自己研究领域以外的指标难以做出准确评价,模糊性指标也使专家会在几个评价值之间犹豫。针对犹豫模糊软集可以更加准确的描述事物模糊本质,对可选对象没有限制,充分考虑专家决策的犹豫度得特性,本文提出一种基于犹豫模糊软集的专利质量评价模型,给出评价方法的具体步骤,并通过案例分析说明该方法的可行性与可靠性。     

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.     

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.     

A computer generator for randomly layered structures

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

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

<正>~~     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to