优选法在农业上的应用 优选法在混合农药配比上的应用

为更有效地防治棉红蜘蛛和棉蚜的危害,湖北省宜都县农科所应用优选法对土农药石硫合剂和敌百虫混合使用浓度,进行了初步试验,观察混合农药对两虫兼治的结果。一、优选范围:90％敌百虫常用浓度是0.05～0.1％(1斤药加水2000～1000斤),石硫合剂对棉花可用浓度范围是0.1～0.4波美。根据实践,上述两因素中,影响效果和安全的主要是石硫合剂的浓度。因此,敌百虫常用浓度范围只计算两个点,石硫合剂可用浓度范围则计算四     

大丽花白粉病的发生规律及防治研究

大丽花白粉病是大丽花栽培中的重要病害。病原菌以菌丝体在病残体上越冬，借气流和风传播，以分生孢子扩大再侵染。病原菌为真菌寥白粉菌（Erysiphe polygoni DC),药剂防治宜在移载后1个月进行，隔7d喷1次，共2次。试验表明：各药剂间的防效差异显著，以2%的石硫合剂和50%的退菌特800倍液的效果最佳。     

几种药剂对大叶黄杨炭疽病的防治试验

大叶黄杨炭疽病是咸丰县大叶黄杨上的一种常见病害,为筛选出防治大叶黄杨炭疽病的有效药剂,通过6种药剂的室内药效试验和田间防治试验。结果表明,大叶黄杨炭疽病可选用50%多菌灵WP500倍液、10%苯醚甲环唑WG2000倍液、25%炭疽福美WP 1200倍液、75%百菌清WP600倍液进行防治。     

石硫合剂涂抹防治枸杞蚜虫试验

田间试验观察了石硫合剂7种浓度涂抹防治枸杞蚜虫的防治效果,其中石硫合剂400倍液防效与持效综合效果最好,蚜虫初见1d、3d、5d、14d、21d、28d防效分别为100％、87.91％、85.98％、78.69％、73.87％、67.99％.     

石硫合剂的熬制和科学使用事项

作为新一种农林业、园艺、园林绿化不可或缺的无公害药物,石硫合剂有着越来越广泛的应用。本文就石硫合剂的熬制和科学使用事项等进行了全面总结,主要为开发好、推广好、利用好石硫合剂提供帮助。     

保护地蔬菜主要病虫害的药剂防治技术

黄瓜霜霉病、番茄灰霉病和温室白粉虱等是保护地蔬菜栽培中主要发生的病虫害,具有危害损失大和防治难的特点.对这3种病虫害的药剂防治技术的研究结果表明,72%克露WP、72%霜脲·锰锌WP和72.2%普力克水剂对黄瓜霜霉病,40%嘧霉胺SC、40%施佳乐SC和50%多·霉威WP对番茄灰霉病均有较好的效果;但部分药剂如75%百菌清WP对黄瓜霜霉病、50%多菌灵WP和50%速克灵WP对番茄灰霉病等已产生抗药性.70%阿克泰WG和10%吡虫啉WP采用喷雾和灌根防治温室白粉虱均有较好防效.     

8 种杀菌剂防治马铃薯晚疫病的田间药效试验

8种不同杀菌剂对马铃薯晚疫病田间药效试验结果表明,50%施得益WP、60%双工福玛WP、25%瑞凡SC、80%大生M-45WP、30%富民一号SC 5种杀菌剂对马铃薯晚疫病的防效均在70%以上,以50%施得益WP防治效果最好,防效为87.65%。施用50%施得益WP和60%双工福玛WP后增产率极显著,挽回损失55.54%和47.44%。     

含铜难处理金矿选择性浸出试验研究

针对某含铜难处理金矿进行了碘化法和石硫合剂(lime sulfur synthetic solution,LSSS)法的选择性浸金的研究。结果表明,在碘单质质量浓度为8g/L,浸出时间为2h的条件下,碘化法浸出金的浸出率为88.1%,而且铜的浸出率不足1%。在石硫合剂质量分数为25%,浸出时间为6h的条件下,LSSS法浸出金的浸出率仅为73.5%。对比碘化浸出和石硫合剂浸出效果可知,碘化法对该含铜难处理金矿不仅浸出速度快、浸出率高而且铜几乎不被浸出,具有很强的选择性浸金作用。     

不同杀菌剂防治九里香白粉病药效试验

于2003年5月19日至6月17日，用70％甲基硫菌灵可湿性粉剂、75％百菌清可湿性粉剂、20％三唑酮超微可湿性粉剂和30波美度的石硫合剂在广西生态工程职业技术学院的学院办公楼前(A区)、化学实验楼前(B区)、水塘区教工宿舍周围(C区)、学院图书馆旁(D区)的九里香自粉病(Oidium sp．)进行药效防治试验。每区设70％甲基硫菌灵1000倍、75％百菌清600倍、20％三唑酮1000倍、0．2波美度石硫合剂、清水对照5个处理，每个处理重复3次，喷药3次。每次喷药后第7d调查防治效果，计算病情指数。结果表明：用0．2波美度的石硫合剂或70％的甲基硫菌灵1000倍液防治九里香自粉病，效果均优于生产上惯用的三唑酮、百菌清，平均防效达76％以上。     

设施葡萄病虫害防治

白粉病：加强栽培管理，合理留蔓，枝蔓不要留的过多、过密，使之均匀地分布于架面，改善通风透光条件。施肥要合理，氮、磷、钾肥要合理搭配，防止单施氮肥，造成枝叶疯长，荫蔽严重，影响通风透光，创造不利于白粉病发生的条件。发芽前喷一次3度至5度石硫合剂；发芽后喷0．3度至0．5度石硫合剂或发芽前喷150倍至200倍，发芽后喷600倍晶体石硫合剂。     

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…     

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).     

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.     

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.