结果分析中...
检索条件:"关键词=direction "
条 记 录,以下是1-10
|
视图:
排序:
期刊我国精细磷酸盐产业的现状及发展的重点和方向
《肥料与健康》2021年第1期6-9,共4页孙志立 黄平 问立宁 李江滔 
介绍了我国磷酸盐产业的现状及国际精细磷酸盐产品的发展特点。针对我国磷酸盐产业发展中存在的薄弱环节,提出了走绿色化、高端化、精细化和专用化的战略路线,指出了向精细磷化工与功能材料等高端产品发展的方向。
关键词:精细磷酸盐 产业现状 发展 方向 
期刊HOUSE CHANGE DETECTION BASED ON DSM OF AERIAL IMAGE IN URBAN AREA被引量:1
《地球空间信息科学学报(英文)》1999年第1期68-72,共5页Fan Hong Zhang Jianqing Zhang Zuxun Liu Zhifang 
Project supported by the National Natural Science Foundation of China(No.49525101)
The change of house often brings on the change of DSM in an area over different periods. If we can apply information of the height of houses to reinforce the house change detection, the reliability and efficiency of d...显示全部
关键词:DSM CHANGE detection GRADIENT direction HISTOGRAM 
期刊Indeterminate direction relation model based on fuzzy description framework被引量:2
《中国科学:技术科学英文版》2008年第S1期72-80,共9页LIU YaoLin1,HE JianHua1,YU Yan2 & TANG XinMing3 1 School of Resource and Environment Science,Wuhan University,Wuhan 430079,China 2 School of Resource and Environment Engineer,Wuhan University of Technology,Wuhan 430070,China 3 Chinese Academy of Surveying and Mapping,Beijing 10083,China 
the National Natural Science Foundation of China (Grant Nos. 40701143, 40701145 and 40571127)
The indetermination of direction relation is a hot topic for fuzzy GIS researchers. The existing models only study the effects of indetermination of spatial objects,but ignore the uncertainty of direction reference fr...显示全部
关键词:direction RELATION FUZZY DESCRIPTION FRAMEWORK FUZZY representation model UNCERTAINTY 
期刊Probabilistic composition of cone-based cardinal direction relations被引量:1
《中国科学:技术科学英文版》2008年第S1期81-90,共10页LIU Yu1,TIAN Yuan1 & WENG JingNong2 1 Institute of Remote Sensing and Geographical Information Systems,Peking University,Beijing 100871,China 2 College of Software,Beihang University,Beijing 100083,China 
the National Hi-Tech Research and Development Program of China (Grant No. 2007AA12Z216);the National Natural Science Foundation of China (Grant No. 40701134)
Composition tables play a significant role in qualitative spatial reasoning (QSR). At present,a couple of composition tables focusing on various spatial relations have been developed in a qualitative approach. However...显示全部
关键词:SPATIAL REASONING cardinal direction RELATIONS PROBABILISTIC COMPOSITION 
期刊The Arithmetic Mean Standard Deviation Distribution: A Geometrical Framework
《应用数学(英文)》2013年第11期1-10,共10页R. Caimmi 
The current attempt is aimed to outline the geometrical framework of a well known statistical problem, concerning the explicit expression of the arithmetic mean standard deviation distribution. To this respect, after ...显示全部
关键词:Standard Deviation n-Spaces direction Cosines QUADRICS 
期刊林木采伐限额制度的未来和发展方向
《商情》2014年第41期234-234,共1页张庆林 
随着社会经济的发展,科技的进度,越来越多的生活生产中需要用到木材。它在我们的生活生产中占有不可替代的地位。而如何采伐树木,合理的采伐与管理对于保护林业资源,保护生态环境起到至关重要的角色。如何才能限定好林木采伐的额度...显示全部
关键词:林木采伐(Forest harvesting)限额制度(Quota System)发展方向(The direction of development) 
期刊基于探地雷达的高原鼢鼠洞道结构特征被引量:1
《草业科学》2020年第3期574-582,共9页张午朝 马育军 李小雁 王雷 
国家自然科学基金(41771026、41730854);长江学者和创新团队发展计划资助项目(IRT_15R06)。
高原鼢鼠(Eospalax baileyi)是青藏高原特有的小型穴居动物之一,量化高原鼢鼠的洞道结构可以为深入研究其扰动对生态环境的影响奠定基础,而探地雷达方法可以无损、高效地获取地下洞道的结构特征。本研究借助探地雷达方法获得了高原鼢鼠...显示全部
关键词:洞道深度 直径 走向 探地雷达 高原鼢鼠 
期刊New Insights on Energy Conserved Planar Motion
《工程与科学中的计算机建模(英文)》2016年第2期119-127,共9页Maruthi R.Akella Sofokli Cakalli 
The planar motion of a particle within an arbitrary potential field is considered.The particle is additionally subject to an external force wherein the applied thrust-acceleration is constrained to remain normal to th...显示全部
关键词:ENERGY CONSERVED SPACECRAFT motion FLIGHT direction angle velocitynormal THRUSTING effective potential hodograph interpretation 
期刊Axisymmetric alternating direction explicit scheme for efficient coupled simulation of hydro-mechanical interaction in geotechnical engineering-Application to circular footing and deep tunnel in saturated ground
《岩石力学与岩土工程学报:英文版》2018年第2期259-279,共21页Simon Heru Prassetyo Marte Gutierrez 
the support from the University Transportation Center for Underground Transportation Infrastructure at the Colorado School of Mines for partially funding this research under Grant No. 69A3551747118 of the Fixing America's Surface Transportation Act (FAST Act) of U.S. DoT FY2016
Explicit solution techniques have been widely used in geotechnical engineering for simulating the coupled hydro-mechanical(H-M) interaction of fluid flow and deformation induced by structures built above and under sat...显示全部
关键词:Hydro-mechanical(H-M)interaction EXPLICIT coupling technique ALTERNATING direction explicit(ADE)scheme High-order finite difference(FD) Deep tunnel in saturated groundNon-uniform grid AXISYMMETRIC consolidation Circular FOOTING 
期刊基于遗传学习算法的船舶航向智能控制方法被引量:1
《舰船科学技术》2019年第18期43-45,共3页孙明思 
针对现有船舶航向控制方面采用的传统控制算法,在对船舶航向数据计算过程中存在数据迭代分析准度失常,无法适应性逻辑推导航向数据量的问题。本文提出基于遗传学习算法的船舶航向智能控制方法,利用遗传算法作为理论算法,对船舶航向数据...显示全部
关键词:遗传 学习 航向 智能控制 
共84页<12345678910
聚类工具

北京电子科技职业学院特色库 版权所有 ©2018