浅谈鳖病的预防

鳖病与其他水生动物疾病一样，重在预防，然而，患了病之后务必做到及早治疗，这样可以减少损失和提高疗效。关于鳖病的预防，根据笔者的实践体会认为温室养鳖必须从生态环境、投饲管理和药物预防三方面紧密结合方能奏效。生态环境主要指水温和水质两个环节，如系塑料大棚温室要求提供充分光照的条件。温室中水温要求恒温在３０℃左右，水质的几个主要指标要符合鳖生长的要求，如ｐＨ值７～８．５，溶解氧５ｍｇ／Ｌ左右，氨氮在４ｍｇ／Ｌ以下，亚硝酸盐０．１ｍｇ／Ｌ以下，有机物耗氧量在１２ｍｇ／Ｌ以下。这些指标与投饲管理密切刊关，…     

温室养鳖控制水质恶化的措施

论述了综合养殖,微生物的分解,水生植物的净化、优化水体环境等技术措施在温室养鳖中控制水质恶化的作用。     

工厂化养鳖几个问题的再探讨

本文对我国工厂化养鳖过程中的水温调控，水质管理，鳖用饲料，鳖病防治等问题进行了研究，总结了工厂化养鳖的现状，并从生物学及生产的角度提出了一些新的见解。     

温室鳖池的改进与排污效果的研究

分析了一般温室鳖池的设计弊端及其换水时的排污效果,和换水时对鳖正常活动的干扰.对温室鳖池的设计技术提出了有效的改进措施,从而在减少换水量的同时,提高了排污效果,并克服了换水对鳖活动的干扰.     

工厂化养鳖几个问题的再探讨

本文对我国工厂化养鳖过程中的水温调控，水质管理，鳖用饲料，鳖病防治等问题进行了研究，总结了工厂化养鳖的现状，并从生物学及生产的角度提出了一些新的见解。     

养鳖技术六个关键技术问题

1建造合格鳖池鳖胆小怕喧闹,要根据不同生长阶段建造不同规格的鳖他：（1）种鳖地：面积1～3亩,池深1．2～1．sin,他对角建进排水系,池坡呈30o角斜坡,便于鳖爬行上岸产卵。池北岸设40～6（）m产卵场地。（2）稚鳖、幼鳖池：稚鳖出壳到越冬期体重3～sg,幼鳖体重5～159,两者可合建也可分建。若建室内池,面积为5～10m,深0．8～lin,稚鳖池和幼鳖他用砖块隔开,每池面积2～4m2;若建室外地面积为50～100mZ,则温室内要单独建稚鳖池面积2～10d,长宽比为2：1或5：2。室内地池身最好在地面下40crn,露出地面10rm左右有利保温。池壁对角…     

广东省养鳖业现状及其发展前景

本文就目前广东养鳖业发展现状,根据国内外市场鳖的供不应求,指出养鳖业具有巨大的发展潜力和美好前景。本文着重指出今后发展养鳖业要着重解决好几个存在的问题,特别是种苗供应、缩短养殖周期和鳖病防治等问题,随着这些问题的逐步解决,广东养鳖业将会有更大的发展。     

温室无沙生态养鳖模式

无沙生态养鳖,打破了传统有沙养鳖旧模式,依据生态学原理,对传统的养鳖池进行了改造,实现了对水质、水位、养殖密度的系统调控,科学使用中草药和微生态促进剂预防疾病,可以大幅度提高鳖养殖的成活率、生长速度和经济效益,为养鳖提供一种新的生产模式.     

庭院养鳖技术

鳖俗称甲鱼、团鱼,是一种名贵的水产品,其营养丰富,味道鲜美。近年来,国内外市场对鳖的需求量日益增加,价格不断上涨,而自然界的鳖由于环境的污染和大量滥捕,产量急剧下降。为缓解供需矛盾,采用人工方法养鳖已势在必行。目前,全国各地致力于发展人工养鳖的单位已有不少,但一般均采用常规养殖方     

绿之洋:节能减排养好龟

目前,我国龟鳖养殖温室主要用煤炭供热,浙江省养鳖温室全年加温时间长达9-10个月,年耗标煤25多万吨。与此同时,由于温室养殖水质较差,增加了抗生素等药物的使用量,对生态平衡和产品质量造成严重危害。金华市绿之洋水产有限公司根据浙江省养殖业发展对技术与装备的需求。通过项目的实施,     

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.