不同处理对濒危植物千果榄仁种子发芽的影响

以濒危植物千果榄仁种子为试材，研究了种子经过休眠破除处理和常温储藏后，不同外源激素(赤霉素、萘乙酸)和培养温度对种子发芽的影响.结果表明：生长调节剂种类和质量浓度对种子发芽率的影响极显著(P<0.01),储藏方式和培养温度对种子发芽率的影响不明显(P>0.05),影响程度由大到小依次为生长调节剂种类、生长调节剂质量浓度、培养温度、储藏方式；种子用相同质量浓度的赤霉素、萘乙酸生长调节剂处理后，在不同培养温度下培养，种子发芽率从高到低依次为休眠破除处理变温培养、休眠破除处理恒温培养、常温储藏变温培养、常温储藏恒温培养；千果榄仁种子发芽最优条件是在种子采收后，低温4℃处理30 d,用质量浓度为40 mg/L的赤霉素浸种且在光照变温15～25℃培养箱内培养.     

毛白蜡种子药剂浸种催芽试验

对毛白蜡（ＦｒａｘｉｎｕｓｐｅｎｎｓｙｌｖａｎｉｃａＭａｒｓｈ．）种子进行药剂浸种催芽对比试验,结果表明,５０℃始温温水浸种２４ｈ后,用吲哚乙酸（ＩＡＡ）浸种３ｈ和２×１０－４赤霉素（ＧＡ３）浸种２４ｈ置育苗盆催芽２５～２７天,发芽率分别达到６４％和６２％,与层积催芽法发芽率基本相当。     

浸种时间对莴笋种子萌发的影响

对浸种不同时间的莴笋种子的发芽率、吸水量、电导率进行测定，试验结果表明：未经浸种而直接催芽的莴笋种子，与浸种８、１０ｈ的种子发芽率差异不显著；无论是浸种还是直接置床，莴笋种子经１０ｈ均能达到充分吸胀状态。     

不同浓度赤霉素浸种对刺蒺藜种子萌发特性的影响

在室温26℃条件下,研究了不同浓度赤霉素(0 mg/L、100 mg/L、200 mg/L、300 mg/L、400mg/L)浸种对刺蒺藜种子的发芽率,发芽速率,发芽势、发芽指数、叶长和根长等萌发特性指标的影响。结果表明:不同浓度赤霉素浸种对刺蒺藜种子的发芽率、发芽速率、发芽势和活力指数均有促进作用,浓度为300 mg/L的赤霉素能显著增加发芽率、发芽速率和活力指数,浓度为400 mg/L时能显著增加发芽势,同时,浓度在200~400 mg/L之间,能增加刺蒺藜幼苗根重量、茎长度和茎重量,经300 mg/L浓度赤霉素浸种后,幼苗根冠重量比显著增大。表明赤霉素能显著提高刺蒺藜种子的活力和抗逆性,增强种子的萌发能力。     

赤霉素浸种对雷山杜鹃种子萌发的影响

本文研究了不同质量浓度的赤霉素及不同浸种时间对雷山杜鹃种子萌发的影响,结果表明:雷山杜鹃经不同浓度赤霉素及不同时间处理后,可以不同程度的提高雷山杜鹃种子的发芽率和发芽势,其中,赤霉素浓度为400mg/L,处理24h的发芽率高于其它处理,为66.00%;其次为400mg/L处理36h,发芽率为65.33%;赤霉素浓度为400mg/L下,处理36h和48h发芽势较高,均为61.00%。因此,适宜促进雷山杜鹃种子萌发的条件是赤霉素浓度400mg/L浸种36h。     

变温沙藏处理对石灰花楸种子的催芽作用

为了解决石灰花楸种子的育苗技术问题,研究了低温（恒温＋变温）沙藏处理和不同赤霉素浓度（50、100、150、200mg/L）浸泡对石灰花楸种子发芽率的影响。结果表明：在0～1℃低温区后在5℃高温区下的变温沙藏（2种温区每30天调整1次）处理的石灰花楸的发芽时间要晚于5℃恒温区的发芽时间,但发芽率显著提高且持续发芽时间延长。100mg/L和150mg/L2个处理由恒温沙藏的2%左右分别提高到了7.6%和12.3%。用赤霉素溶液浸泡12h利于打破种子休眠,可提高发芽率。用不同浓度赤霉素浸泡后,经过变温沙藏的种子发芽率从未经赤霉素处理的1.4%提高到15.6%～48.7%,最佳赤霉素浓度为150mg/L。     

不同药剂浸种对芹菜种子发芽的影响

通过不同药剂处理对芹菜种子,结果表明:321mg.mL-1的PEG(6000)浸种极显著地提高了芹菜种子的发芽率、发芽势以及种子活力;NaCl、CaCl2及低浓度的赤霉素(0.01~0.1mg/mL)混合液浸种也具有相同的效果;而混合液中高浓度的赤霉素(1 mg/mL)浸种则会降低种子的发芽率、发芽势以及种子活力。     

赤霉素处理香樟种子对发芽的影响

本试验通过用不同浓度的赤霉素和不同时间，对香樟种子进行处理，打破香樟种子休眠，手求提高香樟种子发芽率的方法。试验结果表明：以40ppm浸种5h和50ppm浸种8h处理最有效。能将香樟种子发芽率提高45％以上。     

不同水温浸种对川续断种子发芽率的影响

目的:为解决川续断人工种植过程中种子发芽率低,出苗不整齐的问题。方法:使用常温清水;40℃、45℃、50℃、55℃、60℃的温水浸种进行人工催芽试验。结果:40~60℃水温浸泡种子,不同程度降低了种子的发芽率,而常温水浸种催芽川续断种子发芽率达85%以上,高于其它水温处理。建议:川续断人工种植宜采用集中育苗后移栽,可解决生产中种子直播受自然因素影响,种子发芽率低,出苗不整齐的问题。     

不同处理对赤苍藤种子萌发和幼苗生长的影响

为研究不同因素对药食两用植物赤苍藤(Erythropalum scandens Bl.)种子萌发和幼苗生长的影响,本研究以当年采收的赤苍藤种子为材料,探讨浸种时间(0 d、1 d、2 d、3 d、4 d、5 d)、基质含水量(70%、50%、30%)、播种深度(0 cm、1 cm、3 cm、5 cm)、光照条件(全黑、自然光)、基质(沙土、肥土、黄土、混合土)、赤霉素浸种处理及破壳处理(全破、少破、不破)下赤苍藤种子的发芽率及幼苗特性,为其规模化发展提供理论参考。结果表明,浸种时间、基质含水量、播种深度、赤霉素处理均对发芽率有极显著影响(P<0.01),基质和破壳处理对发芽率有显著影响(P<0.05),浸种5 d、50%和30%的基质含水量、播种深度1 cm、混合土基质、50 mg·L^-1赤霉素浸种12 h以及全破处理的发芽率在各对比的处理中均最高。浸种时间和基质含水量对幼苗叶长和枝高均有显著影响(P<0.05),其他处理对幼苗生长无显著影响。综上可知,赤苍藤种子育苗时,可先浸种5 d或用50 mg·L^-1赤霉素浸种12 h...     

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