搜索结果: 1-7 共查到“知识库 工学 stems”相关记录7条 . 查询时间(0.093 秒)
Model Based Automatic Segmentation Of Tree Stems From Single Scan Data
Forestry point cloud RANSAC segmentation terrestrial laser scanning tree detection
2014/4/22
Forest inventories collect feature data manually on terrestrial field plots. Measuring large amounts of breast height diameters and tree positions is time consuming. Terrestrial laser scanning could b...
Variation of Wood Properties with Height Position in the Stems of Obi-Sugi Cultivars
Obi-sugi cultivars wood property variation microfibril angle basic density height increment
2009/11/23
To promote the use of sugi woods, the information on the variation of wood properties is very important. Obi-sugi is a major group of sugi cultivars planted in Southern Kyushu. However there is no inf...
收割期牧草底部茎秆生物力学性能试验（Experiment on Biomechanical Properties of Bottom Stems of Forage in Harvesting Period）
牧草茎秆 抗拉强度 化学成分 显微结构
2010/5/5
以北方典型多年生豆科牧草紫花苜蓿、小冠花和禾本科扁穗冰草、无芒雀麦收获期底部茎秆为研究对象，在500N微机控制电子万能试验机上试验研究了主要力学性能，并测定了茎秆在不同状态下纤维素、木质素、蛋白质等主要化学成分含量，观测了茎秆的微观组织结构,得到了茎秆扫描电镜下的解剖构造图像。研究结果表明：4种牧草收割期底部茎秆应力σ与应变ε曲线服从虎克定律，禾本科扁穗冰草茎秆抗拉强度高而弹性小；豆科小冠花茎秆抗...
测定了小麦成熟期茎秆的力学性能，研究了茎秆的应力—应变规律。试验观察了茎秆的微观组织结构，得到了茎秆扫描电镜下的解剖构造图像。分析了小麦茎秆承载能力与微观组织结构的相互关系，建立了茎秆横截面的力学模型。结果表明：小麦茎秆是一种典型的多相、筛状、不连续、不均匀和各向异性的复合材料，茎秆具有较高的强度和良好的弹性，其承载能力取决于机械组织的厚度、维管束的数量以及各组织及其细胞之间的连接形式和连接强度，...
小麦茎秆力学性能与化学组分试验 Experiment on Mechanical Properties and Chemical Compositions of Wheat Stems
小麦 茎秆 力学性能 化学成分
2009/5/18
为分析茎秆的力学性能与主要化学成分之间的相互关系，试验研究了小麦成熟期茎秆的主要力学性能，测定了茎秆不同状态下纤维素、半纤维素、木质素，以及蛋白质、脂肪和糖分等主要化学成分含量。结果表明：小麦茎秆最大拉力为182.38～242.74N，拉伸强度为30.36～52.65MPa，弹性模量为1143.44～1985.86MPa；纤维素、半纤维素和木质素的质量分数分别为22.58%～48.18%、10.8...
Chemical Characteristics and Kraft Pulping Response of Phyllostachys pubescens Stems
bamboo carbohydrates lignin kraft pulping kappa number
2009/3/4
Recently, it has been reported that bamboo is sometimes used as a raw material in some of kraft pulp mills. However, there are few findings on relationships between chemical features and cooking or b...
Antioxidative Constituents from Dendrobii Herba (Stems of Dendrobium spp.)
Dendrobii Herba antioxidative effect Orchidaceae
2010/11/22
Ten phenolic compounds; gigantol, moscatilin, tristin, crepidatin, 4-hydroxy-3,3',4',5-tetramethoxybibenzyl, 2,4,8-trimethoxyphenanthrene-3,7-diol, confusarin, moscatin, medioresinol and syringaresino...