黄芩甙的抗氧化作用

以Ｆｅ＾２＋－Ｈ２Ｏ２和ＮＡＤＰＨ－Ｆｅ＾２＋作为氧自由基生成系统造成大鼠肝线粒体脂质过氧化，研究了黄芩甙对脂质过氧化产物丙二醛（ＭＤＡ）生成的抑制作用，以乙酰氨基酚和四氯化碳分别诱导脂质过氧化损伤，测定血清丙氨酸转氨酶活性，肝中超氧化物歧化酶（ＳＯＤ）活性，肝中丙二醛（ＭＤＡ）和谷胱甘肽（ＧＳＨ）含量，研究了黄芩甙对这些指标的影响，结果表明黄芩甙对大鼠肝线粒体脂质过氧化产物ＭＤＡ的生成有抑制作用     

NADH诱导的牛心肌线粒体的脂质过氧化

在ＡＤＰ－Ｆｅ３＋存在下，ＮＡＤＨ可诱导牛心肌线粒体发生脂质过氧化作用．以丙二醛的生成量来衡量脂质过氧化水平，研究ＮＡＤＨ，ＡＤＰ，Ｆｅ３＋及反应时间对线粒体脂质过氧化的影响     

取代度对硫酸酯化虎奶多糖抗氧化活性的影响

通过对一种真菌虎奶多糖（ＨＮＰ）的硫酸酯化修饰,合成了取代度分别为０．３９和０．５５的两种硫酸酯化虎奶多糖Ｓ１－ＨＮＰ和Ｓ２－ＨＮＰ,讨论了Ｓ１－ＨＮＰ和Ｓ２－ＨＮＰ对Ｆｅ＾２＋－Ｖｃ致鼠肝线粒体ＴＢＡＲＳ含量增加的抑制作用对ＣＣＬ４诱导的肝脂质过氧化的保护作用,及对ＣｕＳＯ４－Ｐｈｅｎ－Ｖｃ－Ｈ２Ｏ２－ＤＮＡ体系中．ＯＨ导致的ＤＮＡ损伤化学发光峰的抑制作用差异。结果表明,Ｓ１－ＨＮＰ比Ｓ２－ＨＮ     

纺锤型γ－FeOOH的合成及其热分析研究

采用空气氧化ＦｅＳＯ４与Ｎａ２ＣＯ３作用生成的Ｆｅ（ＣＯ３）ｘ（ＯＨ）２（１－ｘ）悬浮液体系，通过稀土离子Ｙ３＋的掺杂合成出均匀纺锤型铁黄γ－ＦｅＯＯＨ微晶．由ＤＴＡ－ＴＧ和ＸＲＤ分析得出γ－ＦｅＯＯＨ随温度升高，发生如下相变过程：γ－ＦｅＯＯＨ→γ－Ｆｅ２Ｏ３→α－Ｆｅ２Ｏ３．本文还对γ－ＦｅＯＯＨ的脱水过程机制和以γ－ＦｅＯＯＨ为中间体经热处理制备的纺锤形γ－Ｆｅ２Ｏ３磁性能作了初步探讨．     

钙对杂交水稻离体叶片衰老的影响

以叶绿素和蛋白质的质量分数下降作为衰老的生理指标,研究了Ｃａ２＋和Ｃａ２＋的螯合剂ＥＤＴＡ对杂交水稻离体叶片衰老的作用．结果表明,Ｃａ２＋能延缓杂交水稻离体叶片中叶绿素和蛋白质的质量分数的下降,提高超氧化物歧化酶（ＳＯＤ）、过氧化氢酶（ＣＡＴ）、抗坏血酸过氧化物酶（ＡｓＡ－ＰＯＤ）和谷胱甘肽还原酶（ＧＲ）的酶活性;增加抗坏血酸（ＡｓＡ）和谷胱甘肽（ＧＳＨ）的的质量分数;降低膜脂过氧化产物丙二醛（ＭＤＡ）的质量摩尔浓度．１～２０ｍｍｏｌ／ＬＥＤＴＡ降低叶片中叶绿素和可溶性蛋白质的质量分数;降低ＡｓＡ－ＰＯＤ和ＣＡＴ的酶活性;降低ＡｓＡ、ＧＳＨ的质量分数;提高ＳＯＤ酶活性,但对ＧＲ酶活性的影响不大．外加Ｃａ２＋可使ＥＤＴＡ的抑制作用减轻．     

流动注射光度法测铁

用自行组装的ＦＩＡ装置，对Ｆｅ（Ⅲ）、ＳＸＯ，Ｆｅ（Ⅲ）－５－Ｂｒ－ＰＡＤＡＰ－ＥｔＯＨ，Ｆｅ（Ⅲ）－ＣＡＳ－ＨＤＭＡＡ－Ｔｒｉｔｏｎ Ｘ－１００ ３种显色体系分别进行了系统的研究，考察了各种因素的影响，优化了工作条件，建立了３种测铁的新方法。     

密度泛函方法研究了HFe（CO）5^＋中H^＋的电离反应

用密度泛函方法的ＬＤＡ和ＮＬ／ＬＤＡ优化分子片试ＨＦｅ（ＣＯ）５＾＋和Ｍｎ（ＤＣＯ）＾－５的几何结构３，并计算了Ｆｅ（ＣＯ）５的ＮＬ／ＬＤＡ亲子亲合能，其来７５１．６ｋＪ．ｍｏｌ＾－１，介于文献报道的ＨＣＮ和ＮＨ３的质子亲合能之间，解释了Ｆｒ（ＣＯ）５容易从Ｈ２ＣＮ＾＋中得到了质子而难以由ＮＨ＾＋４夺得质子的实验事实。     

1，1′─［四甲基二硅撑］双（环戊二烯基三羰基钨配合物）的合成及反应

１，２－二环戊二烯基四甲基二硅烷与丁基锂作用生成［四甲基二硅撑］双（环戊二烯基负离子盐），后者随即与六羰基钨反应形成１，１－［四甲基二硅撑］双［环戊二烯基三羰基钨负离子盐］，（Ｍｅ２ＳｉＳｉＭｅ２）·［Ｃｐ′（ＣＯ）３Ｗ－］２·２Ｌｉ＋（Ｉ）．（Ｉ）分别与六种卤化物反应，生成在钨原子上引入取代基的产物：（Ｍｅ２ＳｉＳｉＭｅ２）．［Ｃｐ′Ｗ（ＣＯ）３Ｒ］２，（Ｒ：Ｍｅ，Ｃ２Ｈ５，２；ＰｈＣＨ２，３；ＣＨ２ＣＯＯＣ２Ｈ５，４；ＣＨ３ＣＯ，５；Ｐ３ｈＳｎ，６）．（Ｉ）用醋酸处理后，随即分别与ＣＣｌ４，ＮＢＳ及Ｉ２作用，生成相应的钨卤化物，（Ｍｅ２ＳｉＳｉＭｅ２）［Ｃｐ′Ｗ（ＣＯ）３Ｘ］２，（Ｘ：Ｃ１，８；Ｂｒ，９；Ｉ，１０），（Ｉ）与Ｆｅ３＋／Ｈ３Ｏ＋作用发生氧化偶联，生成双核Ｗ－Ｗ键产物（Ｍｅ２ＳｉＳｉＭｅ２）［Ｃｐ′Ｗ（ＣＯ）３］２，１１．（Ｃｐ′＝Ｃ５Ｈ４）     

Tween80-水杨基荧光酮-(NH_4)_2SO_4体系萃取分离Mo(Ⅵ)

研究了 Ｔｗ ｅｅｎ８０－ 水杨基荧光酮（ Ｓ Ａ Ｆ）－ （ Ｎ Ｈ４）２ Ｓ Ｏ４ 体系萃取钼的行为及 Ｔｗ ｅｅｎ８０ 水溶液分相条件的选择．实验表明,在适当ｐ Ｈ 条件下,该体系能使 Ｍｏ（Ⅵ）与 Ｆｅ３＋ 、 Ｃｏ２＋ 、 Ｎｉ２＋ 、 Ｍｎ２＋ 、 Ｚｎ２＋ 、 Ｃｄ２＋ 、 Ｃｕ２＋ 等常见离子分离     

密度泛函方法研究HFe（CO）_5~＋中H~＋的电离反应

用密度泛函方法（ＤＦＴ）的ＬＤＡ和ＮＬ／ＬＤＡ优化分子片试剂ＨＦｅ（ＣＯ）５＋和Ｍｎ（ＣＯ）５－的几何结构，并计算了Ｆｅ（ＣＯ）５的ＮＬ／ＬＤＡ质子亲合能，其值为７５１．６ｋＪ·ｍｏｌ－１，介于文献报道的ＨＣＮ和ＮＨ３的质子亲合能之间，解释了Ｆｅ（ＣＯ）５容易从Ｈ２ＣＮ＋中得到质子而难以由ＮＨ４＋夺得质子的实验事实。ＨＦｅ（ＣＯ）５＋电离Ｈ＋后其几何结构由Ｃ４ｖ对称性变为Ｄ３ｈ对称性，与等电子体ＨＭｎ（ＣＯ）５电离Ｈ＋后几何构型的弛豫相类似。ＮＬ／ＬＤＡ计算的分子片Ｆｅ（ＣＯ）５的弛豫能为－５９．７８ｋＪ·ｍｏｌ－１。计算结果还表明，ＨＦｅ（ＣＯ）５＋电离Ｈ＋后Ｆｅ→ＣＯ反馈π键得到加强，使得ＦｅＣ键缩短，ＣＯ键增长；同时，Ｆｅ原子上的电子电荷减少，而Ｃ和Ｏ原子上的电子电荷增加。Ｍｕｌｉｋｅｎ布居分析同样表明，在ＨＦｅ（ＣＯ）５＋电离Ｈ＋后，Ｆｅ和Ｃ之间的Ｍｕｌｉｋｅｎ键级增加，Ｃ和Ｏ原子之间的键级减少     

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