西辽河平原灌区玉米大小垄种植与合理增密产量效益分析

根据春玉米高产优化栽培生理基础,通过采取大小垄种植方式与合理密植技术研究,探索玉米大小垄种植的合理密度与增产增效关系问题,进而为西辽河平原灌区春玉米高产高效种植提供技术参考。     

高沙土地区春玉米超高产栽培技术

玉米是高产作物，强大的杂种优势和高效的Ｃ４光合途径为高产奠定了遗传生理基础。生产上要进一步发挥玉米的高产潜力，关键是要提高玉米的群体质量，走“足群体，壮个体，高积累”的栽培思路。本文阐述了在高沙土地上高产栽培技术。     

白银市引黄灌区玉米复合群体高产高效模式

白银市引黄灌区玉米复合群体高产高效模式武秉钺，周占敏，张玉虎（白银市农科所７３０９００）白银市引黄灌区包括沿黄河谷灌区以及景电一期、靖会、兴堡川、刘川、工农渠、景电二期共１５处，是全国最大的高扬程分布区，总灌溉面积１１９．６万亩。为使本灌区光热水土资...     

古浪县平川灌区吨粮田建设现状与配套技术

我县平川灌区吨粮田种植方式以小麦玉米带状种植为主，它不同于一般的间混套作，是传统农业经验与现代农业科学技术的结合，是高效利用和深度开发光、温、热及土地资源，增加单位面积农产品产量的有效途径之一。我县自１９９２年开始示范推广这一高产栽培模式，取得了较好...     

白银市高扬程灌区地膜玉米高产高效栽培模式研究

近年来,随着农业系统工程学和电子计算机的广泛应用,国内外已对各种作物进行了可控措施的定量研究,取得了一定成效。白银市高扬程提黄灌区,热量、水分不足,限制了玉米生产。采用地膜覆盖,改善了土壤的水热状况和物理性状,促进了土壤有益微生物的生长和繁衍,加速了土壤养分的转化与供应,对农田生态环境起到了综合改善的效应。这种综合效应增强了玉米的生理功能,加快了生长发育进程,使玉米在高扬程提黄灌区能正常成熟。目前地膜玉米面积达到5,000ha左右。如何高产高效,即是地膜玉米本身持续发展的要求,也是实现粮经饲     

让农民用上"放心"种子——记北京市农林科学院玉米研究中心副主任郭景伦

郭景伦硕士,副研究员。主持和参加了“玉米亲子鉴定技术及其在玉米育种中的应用研究”、“超级玉米制种技术研究”、“高产、优质玉米新品种选育及其种子产业化”、“玉米新品种标准DNA指纹库建立研究”等多项课题的研究工作。2001年入选北京市科技新星计划,先后获北京市科技进步二等奖两项,吉林省科技进步二等奖一项,北京市科技进步三等奖一项,北京市农业技术推广二等奖两项,2005年获得北京市“五四”奖章。     

西辽河平原灌区玉米宽行少耕高产高效种植模式的研究

针对西辽河平原灌区玉米的生产实际,在总结农民经验和理论研究的基础上,设计了畦灌玉米宽行少耕高产高效种植模式,提出了关键技术的具体指标,分析了增产增效的主要机理,并对模式应用中存在的问题进行了探讨。该模式兼具经济效益、生态效益和社会效益,在西辽河平原及其相似地区具有推广应用价值。     

渭河灌区地膜玉米高产综合农艺措施数学模型研究

为了探讨渭河灌区地膜玉米高产综合栽培技术,我们选择了影响玉米生产中(氮、磷)化肥用量、种植密度、播种时期等几个主要因素,实施了多因素多水平的正交回归试验,期望从中获得科学依据来指导大面积玉米生产。 1 试验材料与方法 本试验1991年在陇西县文峰镇三十里铺村实施。当地海拔1650m,年均气温7℃,≥10℃积温2600℃(160天),土层深厚,肥力中等且均匀,水源充足,灌溉     

印度的“白色革命”

前些年,想必大家都听说过“绿色革命”这个名词吧?那是指高产粮食作物培育成功在世界上所产生的巨大影响。当时国际水稻研究所和国际玉米和小麦改良中心培育成一些高产品种,如“菲律宾水稻”和“墨西哥小麦”等,在某些国家推广后,使粮食产量显著增长,部分     

新的玉米杂交种——“莫17×宽叶旅9”

今年春天,我省东阳玉米研究所科研人员去辽宁省丹东市农科所学习时,该所的领导和科技人员详细地介绍了玉米育种经验和高产栽培技术,并介绍了近几年来取得的科研成果。该所新选育的“莫17×宽叶旅9”玉米杂交种,与已在生产上种植的高产杂交种丹玉六号比较,“莫17×宽叶旅9”早熟2～5天,亩产可达1800斤,比杂交种丹玉六号增产10.2%。丹东市农科所决定进行大面积的推广。这个杂交种在东阳玉米所试种亩产达到1350～1500斤。     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

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     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.