排序方式: 共有49条查询结果,搜索用时 15 毫秒
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Zheng Jianyuan 《中国海洋湖沼学报》1986,4(3):304-312
The present paper is an introduction of a universal model of cluster and discrimination in the field of fisheries science.
The mathematical principle and algorithm are described and the application results analysed.
This model is called “weighted generalized distance” method, based on the principle of “minimum distance”. For different types
of data, different methods are put forward. The quantitative attributes are standarized by “norm” method and the qualitative
attributes are quantified by indicative value based on Shannon's information theory to locate the specimen in the coordinates.
An approach by progressive readjustment of pivotal points is employed for the cluster rational. Finally, any new specimen
can be discriminated by the principle of “minimum distance”, too. 相似文献
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煤炭地质保障系统对煤矿的安全、高效生产具有非常重要的作用。煤矿地质保障系统开发面临数据来源多样、地质监测系统集成开发语言不统一、定制化软件导致地质保障平台在不同煤矿适应性差等问题。提出微服务的地质保障系统开发架构,架构分为3层,分别是应用层、平台层和基础设施层。微服务的地质保障架构规范了开发过程,简化了使用的技术栈,优化了系统集成开发流程;将通用的技术业务固化在开发架构,将需要集成的地质类子系统等专业属性强的业务通过微服务方式进行开发和部署运行,降低了开发、集成难度;使用Docker技术封装微服务镜像,让微服务的部署运行不再受到运行环境的影响,提高跨平台移植性,降低了系统的部署难度,缩短了部署时间。微服务地质保障系统架构在唐家会地质保障系统中的开发实践证明:架构的应用改变了现有地质保障类软件的开发模式,通用业务与专业类业务分离,以微服务的形式实现多专业应用集成,便于多团队并行开发,提高工作效率;微服务实现了系统内部各功能之间的高内聚低耦合,不同方法的钻探、物探等专业功能开发可独立完成,使后期运维、修改的可控性大大提高。 相似文献
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Zheng Jianyuan 《中国海洋湖沼学报》1989,7(3):196-210
Surveys since 1959 showed that the dynamic basis of the East China Sea sectional circulation is the nearshore seawater horizontal
divergence caused by wind on the surface compensated by Kuroshio subsurface water convergence caused by meridional current
in the lower layer.
Fish always tend to migrate along certain routes or stay in certain areas favorable for development of eggs, survival of larvae
and living of adults. The movement of water masses supplies a very important driving force for marine animals migrating long
distance.
The lower part of the sectional circulation formed by the subsurface water of Kuroshio is not suitable for the aggregation
of fish because of its lack of oxygen, and has therefore a driving influence on demersal fishes.
This study of the sectional circulation influence on the distributions of some commercially important species in the East
China Sea reveals a close relationship between the circulation and the movement of fish schools.
The principal factors influencing zonal vertical circulation are the meridional vector of the Kuroshio lower layer and atmospheric
circulation, referning here mainly to the subtropical high pressure in the Asia-Pacific area that causes surface divergence
and lifts subsurface water from the bottom to the surface at the nearshore area. Some simple methods for estimating the intensity
of the sectional circulation are, introduced for fishery forecasts and operations. 相似文献
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古潜山的形成与发育受控于多期构造运动,在不同构造背景下所表现出的结构形态是有规律可循的,呈现出成群、成带分布的现象。本文以黄骅坳陷潜山宏观展布特征为研究重点,利用三维地震资料,解剖潜山结构特征,探讨潜山的演化过程。研究表明,黄骅坳陷古潜山可分为基岩褶皱形成的潜山背斜群、基底断块掀斜作用形成的大型断鼻和盆缘裙边断鼻潜山构造三大类潜山。歧口凹陷内部潜山构造带总体构成"轮毂"式格局,沧东-盐山断陷区潜山带结构整体性强,以大型背斜构造为主。基底逆掩断裂系统复杂化潜山构造带内幕结构,可分为三角逆冲构造、背驮式逆冲构造及双重构造等。三大拆离伸展构造系统控制掀斜断块潜山的分布,形成以断鼻和断垒构造为主的潜山构造群。黄骅坳陷古潜山分为四个主要演化阶段:中元古代至古生代末为潜山内幕地层建造阶段,中生代为潜山内幕构造发育阶段,新生代古近纪为潜山宏观面貌定型阶段,新近纪为潜山深埋阶段。 相似文献
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活性炭从硫脲浸出液中回收金的工艺研究 总被引:6,自引:0,他引:6
本文研究了在酸性硫脲浸出液中活性炭回收金的工艺过程,实验表明,在该浸出液中活性炭对金具有较高的吸附速度、吸附率和吸附容量并易于解吸,为工业应用提供了可靠的技术依据。 相似文献
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传统观点认为,碳酸盐岩中的缝合线是在岩石负载或构造应力作用下压溶形成的,是一种化学压实作用的产物。对缝合线进行综合研究,发现其具有“四性特征”,即完整性、亲烃性、排孔性及胀裂汇聚性。综合以上“四性”认为,缝合线主要是岩石在负重或构造应力作用下烃类(或泥质)使岩石发生胀裂形成的一种锯齿状裂缝,是烃类(或泥质)开辟的排烃通道,压溶作用对缝合线的贡献还有待研究。与碳酸盐岩相比,泥岩不发育缝合线,主要在于泥岩优势孔隙半径较大,烃类可以通过微孔以渗透方式向外排放,不需要形成缝合线。通过缝合线形成机理探讨,查明了碳酸盐岩与泥岩排烃方式的区别,进而对碳酸盐岩与泥岩封盖性进行对比。 相似文献
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