纳米抗菌材料应用研究进展

本文简要介绍了纳米抗菌材料的分类和特性,综述了纳米抗菌材料在抗菌涂料、抗菌纤维、抗菌塑料、抗菌陶瓷、抗菌玻璃、抗菌金属制品、化妆品等方面的应用研究进展,并且探讨了纳米抗菌材料的发展前景。     

无机抗菌材料及其抗菌机理

在功能材料领域，以抗菌杀菌为主要特征的新型材料，尤其是具有无毒、抗菌功效持久等特点的无机抗菌材料日益受到人们的关注。主要介绍了无机抗菌材料抗菌机理、抗菌特点以及该类材料的应用领域与前景，提出了抗菌材料今后的研究和发展方向。     

纳米二氧化钛抗菌材料的研究

介绍了纳米TiO2的结构特点、制备方法及表面改性处理,概述了纳米TiO2抗菌材料的抗菌机理及抗菌特点,综述了国内外抗菌性能的测试方法和评价标准,探讨了纳米TiO2抗菌材料的应用领域和发展前景.     

Li掺杂二氧化钛抗菌材料的表征及抗菌性

通过溶胶-凝胶法(Sol-gel)进行金属Li离子掺杂TiO₂抗菌剂的制备,采用大肠杆菌(ATCC 25922)为实验菌种,对掺杂锂源、掺杂量、表面活性剂、焙烧温度等因素对材料抗菌性能的影响进行探究,并讨论了该抗菌材料的抗菌机理.应用 X射线衍射(XRD)、扫描电镜(SEM)和紫外可见漫反射光谱(UV-Vis-DRS)等测试手段对样品的基本形貌、物相结构及光吸收特性进行表征,通过调整制备过程中各影响因素,得到Li掺杂TiO₂ 抗菌材料的最优反应条件.实验得出,Li掺杂TiO₂纳米抗菌材料对大肠杆菌的抗菌率达到99.5%以上,其抑菌环直径达到2.6cm.该抗菌材料通过抑制抗菌剂的晶粒长大和拓展光响应范围等方法增进抗菌剂的光催化性能.     

抗菌复合材料的研究进展

为开发新型的抗菌复合材料 ,开拓传统材料的应用范围 ,掌握抗菌材料的研究方向 ,选择剖析了典型的抗菌材料。从材料的选择和制备方面 ,讨论了材料的特性与抗菌功能相结合的常用途径。通过分析和对比 ,对已取得的关于抗菌复合材料的研究成果进行了总结 ,归纳出制备抗菌复合材料的一般工艺过程 ,探索研制具有良好综合性能抗菌材料的工艺和方法 ,结合目前实际状况 ,提出了设计和研制抗菌生物材料的思路 ,为开发适合我国国情的抗菌复合材料提供有价值的参考     

纳米抗菌材料

文章主要对当前纳米抗菌材料的概念、分类、抗菌机制、制备方法及其应用情况进行了综述，并对两类主要的纳米抗菌材料——纳米载银抗菌材料和纳米二氧化钛抗菌材料存在的缺点提出了几点建议。     

无机抗菌材料及应用

简要地介绍了与抗菌有关的术语 ,无机抗菌材料的种类、特点、抗菌机理及抗菌材料在工业、民生各相关领域中的应用 .可以预言 ,无机抗菌剂将成为新兴产业 ,并将促进相关传统产业的提升 ,改造和发展     

银的抗菌作用机理

介绍银的抗菌机理的4种理论：静电吸附杀菌、金属溶出杀菌、光催化杀菌和复合作用杀菌。分析银的抗菌机理与抗菌材料载体种类、细菌结构与成分及银的价态的关系。要得到既长效又广谱、既高效又安全的银系抗菌材料，有必要对银的抗菌机理进行更深入的研究。     

石墨烯基银抗菌材料的制备方法及抗菌机理研究

阐述了石墨烯基银抗菌材料的最新研究进展,主要包括石墨烯基银抗菌材料的制备方法及其抗菌机理研究.在石墨烯基银抗菌材料的应用方面,展望了该类复合材料的发展趋势.     

CaHPO_4抗菌陶瓷材料的研制

本文论述了以磷酸氢钙为载体，以银、锌金属离子为抗菌物质的抗菌陶瓷材料的制备方法，并通过抗菌试验和洗提实验，验证了这种新型抗菌材料的抗菌性和稳定性。结果表明：ＣａＨＰＯ４抗菌陶瓷材料抗菌效果好，稳定性强，使用安全，应用厂泛。     

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…     

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.     

Tracking data management using topology of moving object database system for moving object constrained trajectory in LBS application

Advances in wireless technologies and positioning technologies and spread of wireless devices, an interest in LBS (Location Based Service) is arising. To provide location based service, tracking data should have been stored in moving object database management system (called MODBMS) with proper policies and managed efficiently. So the methods which acquire the location information at regular time intervals then, store and manage have been studied. In this paper, we suggest tracking data management techniques using topology that is corresponding to the moving path of moving object. In our techniques, we update the MODBMS when moving object arrived at a street intersection or a curved road which is represented as the node in topology and predict the location at past and future with attribute of topology and linear function. In this technique, location data that are corresponding to the node in topology are stored, thus reduce the number of update and amount of data. Also in case predicting the location,because topology are used as well as existing location information, accuracy for prediction is increased than applying linear function or spline function.