γ-氨基丁酸对家鸽(Columba livia)顶盖脑片Ⅲ层神经元电活动的影响

在２５只家鸽的离体顶盖脑片上,用玻璃微电极胞外记录到顶盖Ⅲ层神经元自发放电单位５５个,观察了γ氨基丁酸（ｇａｍｍａａｍｉｎｏｂｕｔｙｒｉｃ,ＧＡＢＡ）及其拮抗剂以及电刺激Ⅱａ～ｆ亚层对Ⅲ层神经元电活动的作用．作用显示：脑片灌流ＧＡＢＡ（１０－６ｍｏｌ／Ｌ,３ｍｉｎ）后,１６／２１个单位（占７６．２％）放电频率减少,１／２１个单位（占４．８％）放电频率增加,４／２１个单位（占１９．６％）放电频率无变化．ＧＡＢＡ的这种减频作用可被１０－６ｍｏｌ／Ｌ荷包牡丹碱（ｂｉｃｕｃｕｌｉｎｅ,ＢＩＣ）逆转．１４个被Ⅱａ～ｆ亚层刺激传入减频的Ⅲ层神经元,其中１１个单位（占７８．６％）的减频作用可被ＢＩＣ阻断,另３个单位则不产生阻遏作用．上述药物的作用具有可逆性和重复性．结果表明：家鸽顶盖Ⅲ层中可能有ＧＡＢＡ能纤维的到达,Ⅲ层内存在ＧＡＢＡ敏感神经元．顶盖Ⅱａ～ｆ亚层与Ⅲ层神经元间的抑制性突触传递过程中有ＧＡＢＡ及其相应的ＧＡＢＡＡ型受体参与     

不同硫酸盐添加剂对铅蓄电池正极性能的影响

采用６Ｖ－６Ａｈ电池测定了含不同硫酸盐添加剂的正极活性物质利用率及电池的湿储存性能，结果表明：含添加剂硫酸亚锡、硫酸钠、硫酸镉和硫酸铋的正极在５Ａ（１．２ｈ率）恒流放电时，其活性物质利用率分别为３８．６％、３６．９％、３５．９％和３４．１％，而无添加剂时则为３２．４％；电池经１年储存后，在相同的放电条件下，测得电池年自放电率，分别为２６．７％，１４．９％，１９．８％及１１．７％，而无添加剂时则为２     

新型静止无功发生器的 GTO 保护

分析了新型静止无功发生器（ＡＳＶＧ）装置中可能出现的非正常运行状态及应采取的ＧＴＯ保护措施，包括：大功率门极可关断晶闸管（ＧＴＯ）门极驱动器设计，以实现ＧＴＯ的正确开通及关断，并提出ＧＴＯ串联运行时门极驱动器的设计要求；ＧＴＯ的过电压保护，包括关断过电压保护、瞬态浪涌过电压保护及直流侧过电压保护；ＧＴＯ的过电流保护，包括负载过电流保护、ＡＳＧＶ输出侧短路保护、逆变器桥臂直通保护。针对情况最严重的桥臂直通短路，设计了一种环流过电流保护，并给出了试验结果。在此基础上，以±３００ｋｖａｒＡＳＶＧ为例，给出了分级动作的装置整体保护方案。±３００ｋｖａｒＡＳＶＧ装置的试运行验证了作者所给出各种保护方案的可行性及正确性。     

各种布尔矩阵最大广义逆

设Ａ是布尔矩阵，依据４个性质、ＡＧＡ＝Ａ，ＧＡＧ＝Ｇ、（ＧＡ）￣Ｔ＝ＧＡ、（ＡＧ）￣Ｔ＝ＡＧ的不同组合，定义了五种广义逆Ａ￣－、Ａｒ￣－、Ａ＿ｍ￣－、Ａ＿ｌ￣－、Ａ￣＋，这里Ｇ是布尔矩阵．本文中，我们证明了，如果Ａ￣－、Ａｒ￣－、Ａｍ￣－、Ａ＿ｌ￣－、Ａ￣＋，存在，那么它们一定有最大广义逆，其表示分别为（Ａ￣ＴＡ￣ＣＡ￣Ｔ）￣Ｃ、（Ａ￣ＴＡ￣ＣＡ￣Ｔ）￣ＣＡ（Ａ￣ＴＡ￣ＣＡ￣Ｔ）￣Ｃ、（Ａ￣（ＴＣ）ＡＡ￣Ｔ）￣Ｃ、（Ａ￣ＴＡＡ￣（ＴＣ））￣Ｃ、Ａ￣Ｔ．     

中国人血管紧张肽原基因M235T多态位点与原发性高血压的关联分析

研究了中国汉族自然群体中血管紧张肽原基因（ＡＧＴ）Ｍ２３５Ｔ多态位点在原发性 高血压患者和同龄对照者之间的等位频率分布．观察到ＡＧＴ基因的Ｍ２３５Ｔ位在中国汉族 人群中存在两个等位因子的遗传多态性（Ｍ２３５／２３５Ｔ）,其杂合率（ｈｅｔｅｒｏｚｙｇｏｓｉｔｙ）为３０％． Ｔ２３５基因在高血压群体中为８８．７％,在正常人群的频率为７９．０％,两者有显著性差异（ｘ２＝ ６．２６４,ｐ＜０．０２）．提示中国人血管紧张肽原基因（ＡＧＴ）Ｍ２３５Ｔ多态位点与原发性高血压之 间有显著关联．     

γ—氨基丁酸对家鸽（Columba livia）顶盖脑片Ⅲ层神经？…

在２５只家鸽的离体顶盖脑片上，用玻璃微电极胞外记录到顶盖Ⅲ层神经元自发放电单位５５个，观察了γ－氨基丁酸９ｇａｍｍａ－ａｍｉｎｏｂｕｔｙｒｉｃ，ＧＡＢＡ）及其拮抗剂以及电刺激Ⅲα￣ｆ亚层对Ⅲ岐神经元电活动的作用。作用显示：脑片灌流ＧＡＢＡ（１０＾－６ｍｏｌ／Ｌ，３ｍｉｎ）后，１６／２１个单位（占７６．２％）放电频率减少，１／２１个单位（占４．８％）放电频率增加，４／２１个单位（占１９．６％）放电频     

家兔高脂血症模型的建立及其在灵芝药理研究中之应用

作者采用脂肪乳剂对家兔连续灌胃２ｗ，分析比较了灌胃前后血清甘油三酯（ＴＧ）、总胆固醇（ＴＣ）、载脂蛋自Ｂ（ＡｐｏＢ）之变化和血浆血栓素（ＴＸ２）和前列腺素１６─Ｋｅｔｏ─ＰＧＦ１α之变化。结果发现：ＴＣ、ＴＧ、ＡｐｏＢ、ＴＸＢ２均明显上升，有极显著性差异（Ｐ＜０．０１）；６－Ｋｅｔ－ＰＧＦ１α明显下降，具有极显著性差异（Ｐ＜０．０１）。其中，Ｔｃ含量较灌胃前增力１５．４倍，ＴＧ较灌胃前增加３．３涪，完全符合食饮性动物高脂血症模型的特点。作者采用上述模型观察了灵芝对其ＴＣ、ＴＧ、ＡｐｏＢ、ＴＸＢ２、ｄ－Ｋｅｔｏ－ＰＧＦ１α之影响。结果发现：用灵芝制剂对高脂血症家兔行灌胃治疗，ＴＣ下降率为３．１１８％±２．８９％，ＴＧ下降卒为６２．９９±１２．１８，与对照组有显著差异（Ｐ＜０．０５）。ＡｐｏＢ有一定程度降低。     

伏翼DNA指纹谱探针的筛选

以人工合成的向卫星序列（ＧＴＧ）５、（ＧＴ）８、（ＣＡＣ）５和人源上卫星３３．１５做引物,首次随机扩增了伏翼的基因组ＤＮＡ,从多态性ＤＮＡ片段回收８条特异性片段,即（ＧＴＧ）５ａ、（ＧＴＧ）５ｂ、（ＧＴ）８ａ、（ＧＴ）８ｂ、（ＣＡ）５ａ、（ＣＡＣ）５ｂ、３３．１５ａ和３３．１５ｂ。与被标记过的基础组ＤＮＡ做探针斑点杂交结果表明,８个片段中（ＧＴＧ）５ａ、（ＣＡＣ）５ａ和３３．１５ａ产生了阳性信号,     

Y1—xGdxBa2Cu3O7—δ超导体的磁场烧结致各向异性

在磁场下（Ｈ＝１．３Ｔ）烧结得到的Ｙ１－ｘＧｄｘＢａ２Ｃｕ３Ｏ７－δ）（ｘ＝０～１．０）系超导体表现出明显的电阻率ρ超导转变零电阻温度Ｔｃｆ和临界电流Ｊｃ各向异性，样品的常态电阻率在平行于烧结磁场方向上的值ρ比垂直于烧结磁场方向上的值ρ大８％～７０％，零电阻温度Ｔｃｆ∥比Ｔｃｆ┴大１．０～５．０临界电流Ｊｃ比Ｊｃ大９％～７３％，而且在外磁场（Ｈｔ＝２．０Ｔ）下测得的临界电流Ｊｃ随外扬Ｈｔ与烧结磁场     

一类由群表示诱导的迹函数

讨论了ＴＭ＾Ｇ（Ａ）的性质,这里Ｇ是ｍ次对称群Ｓｍ的子群,ＴＭ＾Ｇ（Ａ）表示群Ｇ的酉表示Ｍ诱导的迹函数,定义为ＴＭ＾Ｇ（Ａ）＝∑σ∈ＧＭ（σ）∑ｔ＝１ａｔσ（ｔ）,所得结果推广了Ｔｘ＾Ｇ（Ａ）的性质,这是ｘ是群Ｇ的特征标。     

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