制造业污泥热重分析特性研究

用非等温热重分析法对制造业产生的污泥热重特性进行了研究,并分析了不同升温速率、不同气氛（N2、空气）对热解气化特性的影响,发现物料升温速率的增加会使TG、DTG曲线向高温方偏移,同时使DTG的主峰值减小,而次峰值增大。通过对制造业污泥的表观反应计算和试验污泥类危险废物的热重过程,基本上可以反应出物料的失重过程。     

用差热分析法(DTA)测定市售安乃近片开环表观活化能及纯度分析

利用差热分析法（DTA）研究了在升温速率10℃／min，静态空气气氛下安乃近原药和市售安乃近片的开环分解过程的峰值和热焓及在不同升温速率条件下市售安乃近片开环表观活化能．通过开环峰值和热焓的比较来检验纯度与紫外分光光度法测定结果相一致．研究表明，安乃近开环表观活化能较高，热稳定性较好，但随着纯度的降低开环表观活化能变低，说明赋形荆会降低安乃近的热稳定性．     

CaCO3分解机理和动力学参数的研究

在升温速率为5-30K/min的范围内利用热天平对平均数径为13.4μm的CaCO3进行了分解过程的实验研究，应用等转化率法，在不假定机理函数的情况下，得到了CaCO3分解的活化能随转化率变化的规律，并将转化率外推为零，得到了理论上新物相晶核形成时的活化能Eα→0=243.62kj/mol，同时，对于N2气氛，不同升温速率下CaCO3的热分解，在假定CaCO3分解机理函数的情况下，得到了30种不同机理函数所对应的动力学参数，将升温速率外推为零，得到了理论上系统处于平衡状态下的动力学参数Eβ→0与InAα→0，将Eβ→0与Eα→0相比较，确定了CaCO3分解的最可能机理是n=2/3的成核与生长过程。     

聚亚苯基苯并二唑的热分解行为

用热失重方法分析了聚亚苯基苯并二唑（PBO）纤维在不同气氛中的热分解行为,采用Ozawa法计算了PBO纤维在氮气和空气两种气氛中的热分解活化能.结果表明升温速率对PBO纤维的热分解温度有较大影响;氧气作为热分解反应的引发剂,大大降低了分解反应的活化能;由IR光谱对不同温度裂解产物结构的分析,推测了热氧化降解对PBO纤维分子结构的影响;在不同失重率时几乎相同的热分解活化能,表明无论热分解的气氛如何,PBO纤维的热分解均是一个无规引发的单阶段过程;结合PBO纤维在两种气氛中的热分解机理,解释了分解气氛对残碳率的影响.     

聚亚苯基苯并二(口恶)唑的热分解行为

用热失重方法分析了聚亚苯基苯并二唑(PBO)纤维在不同气氛中的热分解行为,采用O zaw a法计算了PBO纤维在氮气和空气两种气氛中的热分解活化能。结果表明升温速率对PBO纤维的热分解温度有较大影响;氧气作为热分解反应的引发剂,大大降低了分解反应的活化能;由IR光谱对不同温度裂解产物结构的分析,推测了热氧化降解对PBO纤维分子结构的影响;在不同失重率时几乎相同的热分解活化能,表明无论热分解的气氛如何,PBO纤维的热分解均是一个无规引发的单阶段过程;结合PBO纤维在两种气氛中的热分解机理,解释了分解气氛对残碳率的影响。     

含萘环聚醚砜醚酮酮热分解动力学研究

以热重法研究了新型含萘环聚醚砜醚酮酮(PESEKK)在N2和空气中不同升温速率时的热降解过程.结果表明,PESEKK在空气中的热降解过程为二步反应,在N2中为一步反应;随着升温速率的增大,其降解温度线性升高,在N2中的降解温度比空气中的高.由Ozawa等失重百分率法求得PESEKK在N2中失重0%～30%的反应活化能在230.2～239.5kJ·mol-1,频率因子A值在2.315×1014～4.718×1014min-1之间,并确定了其热降解反应的表观反应级数为1.     

微细菱镁矿热分解过程及动力学

采用TG-DSC热分析技术,在不同升温速率下对高纯微细菱镁矿进行热分解动力学研究.结果表明:随着升温速率的增大,菱镁矿分解速率不断增大且最大分解速率也向高温区偏移.首先使用Hu-Gao-Zhang方程对不同升温速率的TG数据进行计算,确定了热分解机理函数的唯一性和活化能.进而采用双等双步法和产品形貌分析,确定其最概然机理函数为f(α)=2(1-α)^1/2,热分解沿解理面向内进行,属于典型的相边界反应.最后利用Flynn-Wall-Ozawa方程求得指前因子,建立了微细菱镁矿的热分解动力学方程.用两组不同升温速率的TG数据对所建立方程进行验证,方程合理.     

桐油多元醇的热重及热分解动力学研究

利用TG-DTG技术在不同升温速率下研究了本实验室所制备的两种桐油多元醇的热分解行为,并通过Kissinger法确定了热分解动力学参数.结果表明:在氮气气氛下随着升温速率的增加,桐油多元醇的热分解温度提高;醇解桐油多元醇的热失重过程分为两个阶段,胺解桐油多元醇的热失重过程则分为3个阶段;通过不同实验数据拟合得到反应活化能(E)和频率因子(A),为桐油多元醇在聚氨酯等方面的应用提供了相关理论依据.     

菱镁矿粉及其料球分解的TG动力学

在热分析仪上进行了菱镁矿粉的程序升温(5、10、15、20、30 K/min)热重动力学实验,用 Coats-Red-fern 积分法确定了动力学特征参数.菱镁矿粉的分解可分为开始和快速两个阶段,分解速率可用一级速率式表示,活化能分别为 130.784 kJ/mol 和 163.728 kJ/mol.升温速率的增加,开始分解和快速分解两个阶段的转换温度升高,转换分解分数降低.     

菱镁矿粉及其料球分解的TG动力学

在热分析仪上进行了菱镁矿粉的程序升温(5、10、15、20、30 K/min)热重动力学实验,用Coats-Red-fern积分法确定了动力学特征参数。菱镁矿粉的分解可分为开始和快速两个阶段,分解速率可用一级速率式表示,活化能分别为130.784 kJ/mol和163.728 kJ/mol。升温速率的增加,开始分解和快速分解两个阶段的转换温度升高,转换分解分数降低。     

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