复合型氨基磺酸系高效减水剂的合成和改性研究

实验合成了氨基磺酸系高效减水剂，同时对产物进行净浆流动度经时损失和砂浆减水率的试验．结果表明该产品对水泥的适应性较好，并能较长时间防止流动度损失，掺量为0．8％时，3h的净浆流动度仍在180mm以上．在已有的氨基磺酸系高效减水剂基础上，引入三种改性剂，经物理复配制成三种复合型氨基磺酸系高效减水剂，实验证明该产品具有掺量小而减水率高的特点，掺量为0．8％时，砂浆减水率达28．0％．     

SM高效减水剂的研制

本文介绍了SM高效减水剂的合成试验，该产品的物理性能与国外同类产品的性能相近，已经达到甚至超过国家一级品减水剂的标准。     

高效减水剂的应用与发展

介绍高效减水剂的种类和分子结构及国内外有关高效减水剂的质量标准，详述高效减水剂对新拌和硬化混凝土性能的影响及高效减水剂与水泥颗粒的作用机理，提出现有高效减水剂存在的问题和高效减水剂今后研究开发的方向。     

改性废旧聚苯乙烯高效减水剂在商品混凝土中的应用

本文介绍了改性废旧聚苯乙烯高效减水剂（复合一定比例的萘系高效减水剂）的产品性能，通过对其性能的测试，发现其减水率高，抗渗性好，混凝土塌落度损失小，施工工艺好等特点，是建材行业中变废为宝的利国利民的典型之一。     

共聚羧酸高效减水剂的合成与性能评价(第三部分)

合成出一类含多种侧链官能团的共聚羧酸高效减水剂（CoPoCa-Ⅲ）。这类共聚物分子中带有羧酸及其盐，磺酸及其盐，羟基，酯基及醚基等。减水率≥28－30％，新拌混凝土初始坍落度很大，且1h内坍落度保持性≥90％，混凝土28d抗压强度最大增加56％。CoPoCa-Ⅲ类高效减水剂还可以与萘系减水剂复配使用，采用20％和CoPoCa-Ⅲ与80％萘系复配的复合型高效减水剂，显改善了萘系减水剂的减水率和混凝土坍落度保持性能。     

脂肪族高效减水剂的合成与性能

丙酮，甲醛和亚硫酸钠为主要原料合成了脂肪族羟基磺酸盐类高效减水剂，讨论了合成条件对产物分散性能的影响并研究了这类高效减水剂的应用性能。丙酮，甲醛和亚硫酸钠在一定摩尔比条件下，通过适当的混合和加入，在90～93℃时反应3h。所得的产物脂肪族羟基磺酸盐高效减水剂HAF具有良好的分散性能。合成的高效减水剂HAF对水泥净浆有轻微缓凝作用；在混凝土中掺量为0．5％时，减水率达到19％，且具有明显的早强和增加抗压强度的特性。     

萘系高效减水剂的合成和性能研究

浓硫酸滴加到萘中生成β－萘磺酸，在甲酸作用下合成出聚萘磺酸盐，并对它们的结构性能和作用机理进行了研究，结果表明，聚萘磺酸盐是一种优良的高效减水剂，在一定的条件下能合成出具有２０％－３０％减水率的高效减水剂，另外发现合成条件对建筑土的净浆流动性有着很大的影响。     

利用麦草浆黑液生产砼减水剂

将碱法麦草浆黑液蒸发、磺化制得的SL型普通砼减水剂,其减水率≥8％,抗压强度增长率R_3≥15％,R_7≥15％,R_(28)≥10％,完全达到了国标GB8076—87的要求。 进一步的试操性试验表明,采用改性剂改性可使SL型普通减水剂达到高效减水剂的水平。     

JN牌系列高效减水剂及缓凝高效减水剂

产品包括JN高效减水剂、JN高效减水剂(缓凝型)、JN-2超塑化剂(高浓型)与JN-3缓凝高效减水剂,通过工艺及特殊的技术措施,使JN-2与JN-3的硫酸钠含量显著降低,改善了缓凝型产品对水泥的适应性,在预拌混凝土、泵送混凝土、大体积混凝土、防水混凝土、高强混凝土、预制混凝土、路桥混凝土等领域应用,提高了工程质量,节省了水泥,并降低了混凝土成本,技术经济效益显著.     

高效减水剂的合成

概述高效减水剂的合成方法，并通过和其他减水剂性能的比较，阐述了推广应用的价值。     

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

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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.     

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