共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
4.
1982-1984年,1989-1991年前后6年在浙江省10县18个贮木场和林场调查13种木材,得到51种木才害虫(其中松材38种,杉材6种),属天牛科17种,小蠹科25种,象虫科6种,吉丁科,长蠹科,树峰科各1种。 相似文献
6.
7.
刘亚宇 《林业机械与木工设备》1998,26(1):23-27
木材涂装的种类与方法1涂装种类的分类涂装的种类可依素材表面涂膜的状态、透过涂膜所见的素材清晰度、素材本色或着色、高光泽或无光泽,以及上涂所用涂料的种类等加以分类,一般涂装分类系统如下:1.1依涂膜的形成状态分类①涂料渗透型涂装(如髹油涂装);②开纹孔... 相似文献
8.
适于木材种类识别颜色空间的研究 总被引:2,自引:0,他引:2
为了确定适合木材种类识别的颜色空间,分别在RGB、HSV、L^*a^*b^*、I1I2I3和归一化T五个常用颜色空间中,获取了木材样本的颜色直方图和颜色矩特征,并进行了识别试验。结果表明,HSV是最适合木材种类识别的颜色空间。 相似文献
9.
10.
13.
15.
为给苦楝(Melia azedarach)和香椿(Toona sinensis)木材的利用提供理论参考,以10年生苦楝木材和17年生香椿木材为研究对象,采用光学显微镜对其主要解剖性质进行分析。结果表明,苦楝木材为环孔材或半环孔材,香椿木材为环孔材;两种木材的生长轮均明显,弦切面上均呈倒“V”字或山水状花纹。两种木材早材管孔弦径相差不大,均稍大。苦楝木材早材管孔多数4列,香椿木材早材管孔多数2列。苦楝木材早材至晚材略急变,晚材管孔向生长轮外部逐渐减小;香椿木材早材至晚材急变。苦楝木材晚材管孔弦径大于香椿木材。香椿木材结构较细。苦楝和香椿木材木射线宽度均属于中等,高度均属于极低,径切面花纹较普通。在实际加工利用中,采用弦切板制作家具板面较美观。香椿木材的导管、薄壁组织、射线组织等细胞中均含有大量红色树胶,使木材呈现红褐色;香椿木材刨面光亮,自然色泽好,具有芳香气味,是制作家具的上等材料。作为家具用材,香椿木材在纹理、色泽和气味等方面优于苦楝木材。 相似文献
16.
17.
木材胶粘剂的作用和特性颜镇,李亚兰,牛丽平(中国林科院木材工业研究所北京100091)本文中的木材,定义为英国标准BS5442(1979)第3部分所述,是指实体木材和人造板;木材胶粘剂的定义是指将木材与木材或其它物体的表面胶接成一体的材料。随着新型胶... 相似文献
18.
19.
20.
杨树新无性系木材性质的变异研究 总被引:4,自引:0,他引:4
The wood basic density, cellulose content and fiber form were investigated for all sample trees at breast height (1.3m) in seven poplar clones, and at 0 (butt), 5.6, 9.6, 13.6, 17.6, 19.6 and 21.6 m for clone Nanlin-95 and Nanlin-895, respectively,for providing information on variation patterns of wood density, fiber characteristics and holocellulose content within trees and among clones. The results showed that significant variations about wood density, cellulose content, fiber diameter and the ratio of fiber length to diameter existed among poplar clones examined. Variance analysis indicated that there were significant differences in wood basic density, fiber length, fiber diameter and cellulose content among the growth rings, which had an increasing tendency along the direction from pith to bark. The significant differences also existed in wood basic density, fiber length and fiber diameter at different tree height. The mean wood basic density had a general increase trend with increasing height of trees and the lowest was found at the base, while fiber length and fiber diameter had a general decline pattern with increasing height of trees and the biggest value was observed at the height of 5.6 m. Regression analysis indicated that the relationship between examined wood properties and growth ring number (cambial age), and the relationship between examined wood properties and tree height can be described by polynomial functions. 相似文献