主要林木害鼠年龄组划分与繁殖的研究

根据１９８７年４－９月在带岭及齐齐哈尔地区捕获的棕背平鼠、沼泽田鼠及东北鼢鼠的数量，依胴体重及繁殖率，划分为幼鼠，亚成体成体Ⅰ、成体Ⅱ及老体５个年龄组。     

近交系NJS小鼠的生物学特性研究Ⅰ．繁殖性能与生长发育的观察

对作者培育的近交系ＮＪＳ小鼠的繁殖性能与生长发育进行观察，结果表明：ＮＪＳ小鼠的基代虽来源于ＫＭ远交群，但由于高度近交和定向选择，其产仔、泌乳等繁殖性能已大大下降。有关繁殖性能指标为：配产间隔２５．９±４．５／ｄ、胎间隔４７．１±１１．４／ｄ、窝产仔数７．６±２．６／只、离乳仔数６．２±２．３／只、离乳率８０．５±２５．２／％、初生个体重１．５５±０．１２／ｇ、泌乳力４４．６７±１７．１２／ｇ、离乳个体重１０．３５±０．９５／ｇ。３０、６０、９０日龄雄鼠个体重分别为：１７．０±２．１／ｇ、２７．８±１．７／ｇ、３１．８±２．１／ｇ，雌鼠分别为：１５．８±０．９／ｇ、２３．５±１．４／ｇ、２５．５±１．６／ｇ。与其他近交系相比较，ＮＪＳ小鼠的繁殖性能与Ｃ＿（５７）ＢＬ／６近似，比ＢＡＬＢ／ｃ、ＤＢＡ／２显著高（Ｐ＜０．０１）。离乳前后ＮＪＳ小鼠的生长速度与ＢＡＬＢ／ｃ近似，比Ｃ（５７）ＢＬ／６、ＤＢＡ／２显著快（Ｐ＜０．０１）。     

绵羊体重对尿中嘌呤代谢物和瘤胃微生物蛋白质产量的影响

１９只阉公羊（Ｂｌａｃｋｆａｃｅ×Ｓｕｆｆｏｌｄ）根据体重不同分为三组，各组每日每只绵羊饲喂干草／精料型配合日粮１０００ｇ，其余食量分别为１３．１、１７．４和２６、８ｇＤＭ／ｋｇＷ，尿中嘌呤代谢物和瘤胃微生物蛋白质产量从５．６５和１２．１１提高到１０．３７ｍｍｏｌ／ｄ和２８．０９ＭＮ／ｋｇＤＯＭＲ。各组干物质和有机物的表观消化率变化不大，但绵羊的体重下降和采食量提高引起饲料中粗蛋白质消化率的明显下降，蛋白质净利用率却明显上升（Ｐ＜０．０１）。     

以臼齿磨损程度划分大仓鼠年龄组的研究

本文以上臼齿的磨损程度作为年龄鉴定指标,根据咀嚼面上磨损齿质露出的多少和构型制订了划分大仓鼠(cricetulus triton)年龄组的标准,将其划分成幼体组、亚成体组、成体Ⅰ组、成体Ⅱ组和老体组五个年龄组。分析结果表明,若用体重或体长划分年龄组,应将大仓鼠划分成四个年龄组。     

前期生长发育受阻育肥猪的补偿生长

以前期生长发育受阻的育肥猪为试验组．正常猪为对照组，两个试验的结果表明，改善饲养条件后，试验组生长速度明显提高，试验１试验组（ｎ＝５）９月龄体重４０．８千克，日增重６８９．１克比对照组提高２３．１％（Ｐ＜０．０１）；试验２试验组（ｎ＝６０）７月龄体重５０．７千克，日增重６５４．８克，比对照组提高１５．６％（Ｐ＜０．０１）；试验组每日采食风干料明显增加，实验１和实验２分别提高２４．６％和１１．８％：试验组每增重１千克耗ＤＥ和ＣＰ实验１减少８．８７％和１１．８％，实验２减少３．７％和４．１％（Ｐ＜０．０１）．体重９０千克左右屠宰，试验组膘厚、后腿比例和脂肪率减少（Ｐ＜０．０５），但瘦肉率提高（Ｐ＜０．０５）．     

长耳鸮冬季的捕鼠特点

长耳号鸟越冬期食物的９１．０％为鼠类。所捕食的农田鼠（黑线仓鼠、黑线姬鼠、大仓鼠和棕色田鼠）占５６．８％,居民区鼠类（大家鼠和小家鼠）占３４．２％,体形较小的鼠类（黑线仓鼠、黑线姬鼠、小家鼠和田鼠）占８２．０％,其中田鼠偶尔出现,较大型鼠类（大仓鼠和大家鼠）仅占９．０％;所捕食鼠的年龄多为亚成体（３８．９％）和成体（３９．２％）;所捕食的主要３种鼠（黑线仓鼠、黑线姬鼠和小家鼠）的年龄组成与野外种群的年龄组成一致。１只长耳号鸟平均１ｄ吃１．７９只或５４．３８ｇ鼠。     

双（N－氰基亚氨基二硫代甲酸）合镍（Ⅱ）酸－（5，7，7，12，14，14－六甲基－1，4，8，11－四氮杂环十四－4，11－二烯）合镍（Ⅱ）的合成与晶体结构

通过盐消除反应合成了双核镍的加合物［Ｎｉ（ｈｍｔａｄｅ）］［Ｎｉ（ｃｄｃ）２］，其中ｈｍｔａｄｅ＝５，７，７，１２，１４，１４－六甲基－１，４，８，１１－四氮杂环十四－４，１１－二烯，ｃｄｃ＝Ｎ－氰基亚氨基二硫代甲酸根。用元素分析、红外光谱、电子光谱和磁化率对它进行了表征。用Ｘ－射线测定了单晶的晶体结构，晶体属单斜晶系，空间群为Ｃ２／Ｃ，晶胞参数ａ＝１１．８８３（２）Ａ，ｂ＝１１．７５３（２）Ａ，Ｃ＝２０．４８２（４）Ａ，ａ＝９０°，β＝１００．１９（１）°，ｒ＝９０°，Ｖ＝２８１５．４Ａ３，Ｍ＝６２８．１９，Ｄｘ＝１．４８２ｇ／ｃｍ２，Ｚ＝４，Ｒ＝０．０４７，Ｒｗ＝０．０５４。正离子的［ＮｉＮ４］为近似平面构型，整个正离子的外形是马鞍型；负离子的［ＮｉＳ４］为绝对平面。在Ｎ（１）和Ｎ（１１）之间形成了氢键，使得加合物呈一维线性链结构。     

福建和溪亚热带雨林凋落物及残留物研究

探讨福建和溪亚热带雨林凋落物产量和地表残留物累积及其动态．结果表明；该雨林年凋落物量为７５５．４３ｇ／ｍ２（年变率为１．１７），其中叶为５１７，３５ｇ／ｍ２，枝为１９１．７５ｇ／ｍ２，花为２１．７６ｇ／ｍ２和果为２４．５７ｇ／ｍ２．影响凋落物月分布的主要因素是降雨及植物的物候期．月凋落物量（ｙ）与月降雨量（１）呈正相关（ｙ＝４６．２８９４＋０．１２０６ｙ，，ｒ＝０．５１０４，ｄｆ＝３４，ｐ＜０．０１）．林地残留物现存累积量随季节的不同而异，平均为４２６．２０ｇ／ｍ２（年分解常数Ｋ＝１．８７），其中叶３０７．６４ｇ／ｍ２，枝１０６．７７ｇ／ｍ２，花０．６０ｇ／ｍ２和果１１．１９ｇ／ｍ２．     

Cl~- 和 SO_4~(2-) 对厌氧废水处理的抑制阈值

用人工配制高浓度有机废水分别研究了Ｃｌ－和ＳＯ２－４对厌氧生物废水处理的抑制作用和抑制阈值．在全混流厌氧恒化器和上流式厌氧污泥床（ＵＡＳＢ）反应器中分别得到了对厌氧消化基本无抑制作用（全混流恒化器：Ｃｌ－＜４．５ｇ／Ｌ,ＳＯ２－４＜１．８ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＜７．２ｇ／Ｌ,ＳＯ２－４＜３．０ｇ／Ｌ）;轻度抑制（全混流恒化器：Ｃｌ－＝４．５～６．０ｇ／Ｌ,ＳＯ２－４＝１．８～３．３ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＝７．２～８．２ｇ／Ｌ,ＳＯ２－４＝３．０～４．１ｇ／Ｌ）;中度抑制（全混流恒化器：Ｃｌ－＝６．０～１３．８ｇ／Ｌ,ＳＯ２－４＝３．３～６．５ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＝８．２～１０．０ｇ／Ｌ,ＳＯ２－４＝４．１～６．０ｇ／Ｌ）和重度抑制（全混流恒化器：Ｃｌ－＞１３．８ｇ／Ｌ,ＳＯ２－４＞６．５ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＞１０．０ｇ／Ｌ,ＳＯ２－４＞６．０ｇ／Ｌ）的不同Ｃｌ－和ＳＯ２－４浓度范围．     

大鳍鳠个体生殖力的研究

大鳍绝对生殖力（Ｆ）为１６４３（２１８～３９６６）粒，相对生殖力（Ｆ／Ｌ）为５３．８３（１１．４９～１２０．８９）粒／ｃｍ，Ｆ／Ｗ＿０为１０．３８（３．６１～１９．７８）粒／ｇ，龟体长范围：１７．０～３８．３ｃｍ：体重范围：５４．０～５０９．０ｇ．绝对生殖力和体长（Ｌ）、净体重（Ｗ＿０）、年龄（ｔ）和成熟系数均呈直线正相关，而与卵径与肥满度无关。生殖力与体长的关系较之与体重的关系更为明显。     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

<正>~~     

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.     

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     

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.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme