智能化P-XRF在构建汽车材料绿色供应链中的应用

汽车行业在管控车用材料有害物质使用的过程中,需要一种低成本、高效率和智能化的检测手段以打造绿色材料供应链,便携式XRF(P-XRF)提供了一种新的解决思路。利用P-XRF对3种汽车零部件中的Pb含量进行测试,结果表明P-XRF具有良好的检测准确性和稳定性。介绍了智能化P-XRF的技术路线,结合手持端设备和CAMDS数据库,可以实现材料成分的远程监控。探讨了汽车产业链中不同企业和机构使用智能化P-XRF进行材料成分管控的方法,表明智能化P-XRF可以有效应用于汽车绿色材料供应链的构建。     

我国汽车VOC检测标准法规现状、问题及措施

介绍了汽车VOC的主要来源和危害,分析了国内外汽车VOC检测标准法规的状况,给出了我国汽车VOC检测面临的问题及应对措施,旨在为我国建立科学合理的汽车挥发性有害物质管理体系奠定基础。     

欧Ⅲ标准对柴油机技术影响初探

随着汽车保有量逐年递增,汽车排放的污染物已经成为环境污染的主要来源,世界各国都相应以法规形式对车用发动机排放物予以强制性限制。无论是欧洲还是美国排放法规的制定,都是依据当地实际     

车用柴油机排放物法规及满足法规的技术措施

介绍了国内外车用柴油机排放物法规和测试方法,分析了车用柴油机排放控制中存在的问题及目前国产车用柴油机排放物的现状。通过对目前所采取的降低车用柴油机有害物的各种技术措施的分析,提出满足未来越来越严格的车用柴油机排放法规,必须把现有的各种有效技术优化组合起来,且应进一步完善柴油机的排气后处理技术以及积极开发新的燃烧方式。     

辐板偏置式车用旋压张紧轮的有限元分析

辐板偏置式旋压张紧轮节省材料、易加工,在汽车工业中应用广泛。本文对某侧辐板的车用旋压张紧皮带轮进行有限元分析,探讨其刚度强度以及带轮厚度和宽度变化对带轮强度的影响,以期对车用旋压张紧皮带轮的设计提供参考。     

微机网络技术引领现代汽车新风尚

随着科技的飞速发展，汽车装备日趋完善，车用电气设备越来越多，使汽车电气系统变得复杂而庞大。如果按照传统的点到点的布线法，整个汽车的布线将十分复杂，不仅增加了材料成本，还给汽车的检测维修带来了麻烦。计算机网络设计中的多路复用通信技术在汽车设计中的应用，则能够很好地解决上述矛盾。     

液化石油气汽车排放的试验研究

液化石油气作为汽车燃料有利于能源的多样化并能降低汽车尾气排放 在发动机台架上对经减少烯烃处理后的三种组分车用液化石油气进行试验 ,并在整车上对多种蒸发器进行测试 ,实验结果表明 ,怠速排放低于原发动机 ,加装电控和三效催化装置后排放满足ECER83 0 1法规     

汽车网络分类方法及其主流协议发展趋势

网络技术大大促进了汽车电子技术的发展 ,但随之带来了网络协议的标准化问题 .为此 ,在SAE(societyauto motiveengineering)对汽车网络分类方法进行分析的基础上 ,结合汽车网络技术的最新发展 ,提出了一种根据功能和传输速率将车用网络分为 5类的分类方法 ;并根据此分类方法综述了目前各类网络中主要的通信协议 ,指出其中最具竞争力的协议 ,以及汽车网络技术的发展趋势     

“油改气”的发展现状与现实思考

由于天然气等能源的大力开发,油价的上涨和燃油导致尾气排放对环境的污染,致使一段时间“油改气”数量不断攀升,改装后的燃气汽车使用的气瓶主要有三种:(汽车用压缩天然气钢瓶[车用CNG钢瓶]、车用液化石油气钢瓶[车用LPG钢瓶]、车用压缩天然气钢质内胆环向缠绕气瓶[车用CNG缠绕瓶]),这其中以车用CNG缠绕瓶居多。现今,随着社会的发展,“油改气”已没有昔日的辉煌。     

我国柴油车、车用柴油机发展面临的形势及对策

近２０年来 ,面对世界石油资源日趋贫乏给社会发展带来的压力 ,面对汽车保有量急剧增长对环境的影响 ,世界汽车界不停地在寻找实现汽车工业可持续发展的解决方法。在不断的技术发展中 ,人们对柴油车、车用柴油机有了更新、更深入的认识 ,也为我国汽车工业发展提供了可借鉴的经验。一、世界柴油车、车用柴油机的发展现状综观世界柴油车和柴油机的发展 ,表现出以下特点。１．柴油机在车用动力中的应用范围逐渐扩大自９０年代以来 ,由于排放控制技术的长足进展 ,柴油机在车用动力中占据着越来越重要的地位。在中、重型汽车动力领域 ,柴油机保持…     

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.     

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.     

A computer generator for randomly layered structures

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

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.