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本文通过阐述城市森林的定义、量化指标及其计算方法,介绍了3S技术在城市森林资源调查中的应用,并以实例应用的方式演示了3S技术调查城市森林资源的具体操作规程。 相似文献
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Kinematic Modeling and Characteristic Analysis of Eccentric Conjugate Non- circular Gear & Crank-Rocker & Gears Train Weft Insertion Mechanism 总被引:1,自引:0,他引:1
A novel weft insertion mechanism named eccentric conjugate non-circular gear & crank-rocker & gears train weft insertion mechanism was proposed in order to better meet the requirements of rapier loom’s weft insertion mechanism as well as reduce the manufacturing difficulty. Meanwhile, based on the working principle of this mechanism, kinematical mathematic models of this mechanism were established and an aided analysis and simulation software was compiled. The influences of eccentricity ratio, deformation coefficient, and other important parameters on the kinematics characteristics of this mechanism were analyzed by using the software. A group of preferable parameters which could meet the requirements of weft insertion technology were obtained by means of human-computer interactive optimization method. The maximum velocity, maximum acceleration, and variation of acceleration of this mechanism are smaller than those of the conjugate cam weft insertion mechanism applied on TT96 rapier loom under the conditions of the same unilateral total stroke of rapier head and the same rotary speed of loom spindle; meanwhile the other demands of weaving technology can be met by this novel weft insertion mechanism. 相似文献
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利用水热方法合成一种新奇的无机-有机杂化化合物(C10H8N2)[H3PM012O40]·H2O,采用元素分析、红外光谱、热重分析、紫外光谱和X射线单晶结构分析对其进行了表征.结果表明:该化合物属于单斜晶系,P2(1)/n空间群;晶胞参数a=1.149 78 nm,b=1.208 85 nm,c=1.728 49 nm,α=90°,β=103.143 0°,γ=90°,V=2.339 5 nm3,Z=2,R1=0.038 8,wR2=0.1117. 相似文献
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针对复杂液压系统故障多样、成因复杂、隐蔽性强,故障源辨识困难,提出了一种基于小世界特性的先网络社团结构划分、后社团内的复杂液压系统故障源搜索的层次分析方法.构建了复杂液压系统的网络拓扑结构,以同时具有大的介数和度数的节点作为网络中故障传播社团的中心,来改进Wu-Huberman算法,从而实现了社团结构的划分.根据各社团连接边对应管路的液压参数变化,确定包含故障源的社团,进一步计算该社团故障传播的可达矩阵,定位了故障源节点.经过对轧钢加热炉液压系统起升故障的分析和故障源查找,证实了该方法可以根据系统网络的结构特征和间接故障表现,实现复杂液压系统故障源的识别. 相似文献
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本文研究了在pH3.6的醋酸——醋酸钠缓冲溶液中,于加热的条件下,铬(Ⅱ)与铬天青S(CAS)和溴化十六烷吡啶(CPB)形成蓝色三元络合物。其λ(?)在620nm 处,摩尔吸光系数ε=1.28×10~5,铬的浓度在0~0.40微克/毫升范围内符合比尔定律,此显色反应应用于天然水、自来水、电镀排放液和合金钢中微量铬的测定,有满意的结果。 相似文献
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以西江231-油田ODP开发方案中的原油物性分析数据为切入点,08西汪23-1油田和南海东部海域其它类似油田的原油物性以及油气水处理流程工艺进行了比较,结果表明:西汪23-1油田的投产可借鉴在开采西汪30-2油田的开发经验,在此基础上提出了西汪23-1油田投产初期化学药剂的选型及加注方案,探讨了西江23-1油田在后续生产过程中化学药剂应用效果的监测与优化方案。 相似文献