氧化钛纳米晶溶胶作为共振光散射探针检测L-酪氨酸

以自制粒径约6 nm的氧化钛纳米晶与L-酪氨酸结合后对共振光散射有增敏作用为基础,建立了以TiO2纳米晶溶胶为探针的共振光散射法检测溶液中L-酪氨酸的方法. 考察了pH、超声时间、静置时间、纳米晶浓度和干扰组分对测定的影响. 酪氨酸浓度在0.5～4.0×10-6 g·mL-1 范围呈现较好的线性, 工作曲线的回归方程为ΔIRLS=640.9c+163.4,r=0.993,检出限为1.0×10-7 g·mL-1. 测定了复方氨基酸注射液(18AA)中酪氨酸的含量, 回收率为(99.5～102.0)%,相对     

次甲基蓝与DNA作用的共振光散射光谱研究及机理分析

基于脱氧核糖核酸(DNA)在pH 3.51~4.49的介质中对有机染料次甲基蓝(MB)的共振光散射的增强效应,提出了一种测定DNA的共振光散射法,并对介质酸度、离子强度、DNA热变性、共存物质干扰等实验条件进行了优化.在最佳条件下绘制了工作曲线,该方法线性范围为0~1 440 ng.mL-1,检出限可达14.1ng.mL-1,用于合成样品中DNA的测定,结果令人满意.通过研究红外光谱、紫外-可见吸收光谱及离子强度的影响,初步探讨了MB与DNA相互作用的机理,MB可能是通过静电作用等以DNA为模板在DNA分子表面进行聚集和长距组装,这种聚集导致MB共振光散射信号的增强,这也是该方法的理论基础.     

光谱法研究Cu(Ⅱ)-核固红-盐酸吡硫醇体系及其分析应用

在弱酸性条件下,核固红,Cu(Ⅱ)与盐酸吡硫醇共存时,导致体系共振光散射强度明显增强.据此建立了测定盐酸吡硫醇的共振光散射分析法.在最佳条件下,Cu(Ⅱ)-核固红-盐酸吡硫醇体系的最大散射峰位于364nm处.共振光散射增强的程度与盐酸吡硫醇的浓度在0.5～11.5μg.mL-1之间呈良好的线性关系.方法的检出限为1.5×10-2μg.mL-1.将方法用于片剂中盐酸吡硫醇的测定,并与药典法进行对照,经t检验证明2种方法无显著性差异.     

固黄O-CTMAB-DNA三元体系的共振光散射光谱的研究及应用

研究了脱氧核糖核酸(DNA)与阴离子染料固黄O(FYO)及阳离子表面活性剂溴化十六烷基三甲铵(CTMAB)三元体系的共振光散射光谱的特征.考察了各种影响因素,在优化条件下确立了共振光散射强度与鱼精DNA和小牛胸腺DNA以及变性后的鱼精DNA和小牛胸腺DNA浓度之间的关系,相应的线性范围分别为0.026～7.00 mg/L;0.025～7.00 mg/L;0.032～6.00 mg/L;0.031～8.00 mg/L,相关系数为0.999 1;0.999 6;0.998 1;0.999 6,检出限分为7.0,6.0,11.0,12.5 μg/L,基于共振光散射的增强,建立了一种测定DNA的新方法.图6,表4,参8.     

同步荧光法同时快速测定水中多环芳烃混合物

建立同时快速测定2,3-苯并芴、苯并[a]芘和苝3种多环芳烃的同步荧光法.选择波长差Δλ=26 nm,只需一次扫描,就可实现3个组分的同时鉴别和定量测定.2,3-苯并芴、苯并[a]芘和苝的线性范围分别为0.02～50 ng·mL-1、0.05～200 ng·mL-1和0.1～400 ng·mL-1,检出限分别为0.003 5ng·mL-1、0.002 1 ng·mL-1和0.006 0 ng·mL-1.该方法简单快速,灵敏度高,线性范围宽,用于各种实际水样的分析,获得很好的效果.     

以六氨合钴(Ⅲ)为探针的DNA共振光散射分析

在pH为1.81～4.1的Britton-Robinson(BR)缓冲溶液中,[Co(NH3)6]3+与脱氧核糖核酸(DNA)相互作用并使其共振光散射强烈的增强.在342.0 nm处增强的共振光散射(RLS)强度与DNA的质量浓度在0.01～7.0 mg/L范围内呈良好的线性关系.据此建立了操作简便、灵敏度高的测定痕量DNA的新方法.该方法用于检测小牛胸腺DNA,检出限达到1.6μg/L级.     

铽-水杨酸-邻菲罗啉三元配合物共振光散射法测定DNA的研究

在pH=7.8的Tris-HCl缓冲液中,DNA可使铽-水杨酸-邻菲罗啉三元配合物共振光散射强度显著增强,在λ=351 nm处共振光散射强度(⊿ I)与DNA浓度具有良好的线性关系.方法的线性范围为0.16～1.2μg·ml-1,检出限为0.068μg·ml-1,RSD为1.82%～2.41%,加标回收率为92.0～106.0%.     

中性红用于痕量DNA测定

在pH 7 6～ 7 8和低离子强度条件下 ,中性红 (NR)与DNA作用产生以 53 5 0nm和 3 50 0nm为特征的共振光散射增强 (ERLS)光谱 .研究表明 ,在最佳条件下 ,在 53 5 0nm处的共振光散射增强与DNA的浓度成线性关系 ,据此建立了用ERLS光谱测定痕量DNA的新方法 .方法的检出限在纳克级 .     

共振光散射法测定镉的应用研究

在十二烷基硫酸钠(SLS)存在的条件下,基于KI和Cd(II)形成[CdI4]2-络阴离子后与四丙基溴化铵(TPAB)结合形成离子缔合物使共振光散射(RLS)信号强度明显增强,建立了运用共振光散射技术测定水样中镉含量的新方法.研究了四丙基溴化铵-碘化钾-镉体系的共振光谱特征,在364 nm处体系的散射光强度最大.在最佳实验条件下,体系的共振光散射强度与Cd(II)浓度在0.08~4.0μg.mL-1范围内呈良好的线性关系,检出限可达2.80ng.mL-1.用此方法测定合成水样中的Cd(II),操作简便快速,回收率在96.4%~105.7%之间,结果令人满意.     

对羟基萘酚兰二钠盐敏化共振光散射法测定DNA的研究

在pH10.23的Tris-HCl缓冲溶液中,阴离子主体小分子对羟基萘酚兰二钠盐(HNB)对阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)与脱氧核糖核酸(DNA:fsDNA、ctDNA)的共振光散射光谱有协同增强作用.考察了共振光散射(RLS)光谱的影响因素,在优化条件下共振光散射强度增加值(ΔI)与DNA浓度之间呈良好的关系,据此建立了一种测定DNA的新方法,该方法具有反应速度快(只须1min)、稳定性好、灵敏度高等特点.对于fsDNA、ctDNA的线性范围分别为0.05～2.5 mg/L,0.04～2.0 mg/L,检出限分别为25.9 ng/mL,24.9 ng/mL.用于fsDNA合成样测定效果较好.     

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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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