三倍体毛白杨无性系木材两个切面密度的可视化   总被引：4，自引：0，他引：4  

张文杰  程磊  张志毅 《林业科学》2004,40(4):211-216

This study uses two different mathematical models and gets two dimensional graphs of longitudinal and tangential section wood density at the same time by the radial wood density data measured by X-ray. The graph is direct and clear. It can be used to analyze the distribution and difference of wood density. It can also be done various kinds of transformation, including different angle, different colors, space and plane, part and entirety. This develops the visible analysis of wood density. Next the distribution of wood density of veneer will be simulated by new mathematical model and radial wood density data.  相似文献   

新型木材防腐剂—─百菌清的研究近况     

蒋明亮 《木材工业》1997,(4)

本文简要阐述了新型木材防腐剂百菌清（ｃｈｌｏｒｏｔｈａｌｏｎｉｌ）制剂防止木材霉菌、变色菌、木腐菌、土栖白蚁的研究近况，并对我国将来开展百菌清的研究提出了建议好的有以下几种制剂：０．５０％百菌清＋０．５０％ＤＤＡＣ、１．０％百菌清乳剂，０．５０％百菌清＋０．１０％ＩＰＢＣ等，防变色菌效果与１．０％五氯酚钠（ＮａＰＣＰ）相当［５］。２防止木腐菌２．１单一百菌清制剂对木腐菌（Ｐ．ｇｉｇａｎｔｅａ，Ａ．ｖａｉｌａｎｔｉ等）防止效果较好的是１．０％百菌清乳剂，其次是１．０％百菌清可湿性粉剂、０．５０％百菌清乳剂、０．５０％百菌清＋０．５０％ＤＤＡＣ、０．５０％百菌清＋０．１０％ＤＩＴＳ［５］。百菌清防止木材６种褐腐菌及５种白腐菌的效果与ＰＣＰ及ＣＣＡ－Ｃ进行了比较；对Ｎｅｏｌｅｎｔｉｎｕｓｌｅｐｉ－ｄｅｕｓ，Ｔｒａｍｅｔｅｓｖｅｒｓｃｏｌｏｒ菌种，百菌清的抑制效果不及ＰＣＰ；对Ｉｒｐｅｘｌａｃｔｅｕｓ，Ｔｒａｍｅｔｅｓｈｉｓｐｉｄａ菌种，百菌清的抑制效果较ＰＣＰ好；对其它菌种，百菌清的抑制效果与ＰＣＰ相当。对Ｇｌｏｅｏｐｈｙｌｕｍｔｒａｂｅｕｍ、Ｐｏｓｔｉａｐｌａｃｅｎｔａ、Ｃｏｎｉｏｐｈｏｒａｐｕｔｅａｎａ、Ｓｅ  相似文献   

房屋建筑材用防腐剂的毒性试验     

周明  刘秀英 《木材工业》1991,5(3):21-24

通过对十八种药剂配方(其中水溶性配方15种、油溶性配方3种)对木腐菌的毒性试验及对初筛后的配方进行流失后毒性试验,结果表明,水溶性配方中的铜铬砷即CCA_3、CCA_4、CCA_5,铜铬硼即CCB_5配方,以及油溶性配方中的P—B剂的毒性较大。  相似文献   

Assessment of wood surface roughness: comparison of tactile roughness and three-dimensional parameters derived using a robust Gaussian regression filter   总被引：1，自引：0，他引：1  

Yuko?FujiwaraEmail author  Yoshihisa?Fujii  Yutaka?Sawada  Shogo?Okumura 《Journal of Wood Science》2004,50(1):35-40

Japanese oak and Japanese beech were sanded by hand with abrasive papers of varying grit number. Two three-dimensional parameters selected to characterize their surface roughness – one parameter for the distribution of roughness-profile peaks and the other for the relative area of the roughness-profile peaks above the threshold height – were compared against tactile roughness. The parameters were obtained from roughness profiles as determined by a robust Gaussian regression filter (RGRF) using seven cutoffs. The RGRF filtering process was adjusted specifically for the evaluation of wood surface roughness. Except for a cutoff wavelength of 0.25mm, the RGRF lent itself well to the determination of roughness profiles. No distortion of roughness profiles occurred around deep valleys, and there was a good correlation between the parameters and tactile roughness.Part of this study was presented at the 2002 Kansai Branch Office lecture meeting of the Japan Society for Precision Engineering, Kyotanabe, August 2002  相似文献   

Wood identification of JapaneseCyclobalanopsis species (Fagaceae) based on DNA polymorphism of the intergenic spacer betweentrnT andtrnL 5′ exon     

Motonari Ohyama  Kei'ichi Baba  Takao Itoh 《Journal of Wood Science》2001,47(2):81-86

DNA was extracted from wood samples of six representativeCyclobalanopsis species (Fagaceae) growing in Japan that cannot be distinguished from one another by conventional microscopy. A part of the intergenic spacer region betweentrnT andtrnT 5 exon was amplified and sequenced. The sequences obtained from wood samples were grouped into three DNA types by a single nucleotide polymorphism as reported previously in leaf samples: I (Quercus acuta, Q. sessilifolia, Q. salicina), II (Q. myrsinaefolia, Q. glauca), and III (Q. gilva). Thus,Q. gilva can be distinguished from the otherQuercus species, and the others are separated in two subgroups based on DNA polymorphism. The present findings support the possibility of wood identification based on DNA polymorphism.  相似文献   

沙柳的材性对刨花板生产工艺的影响   总被引：1，自引：2，他引：1  

高志悦  郭爱龙 《林产工业》1997,(5)

论述了沙柳的材性对刨花板生产工艺和产品质量的影响，并根据分析结果讨论了目前沙柳刨花板的生产工艺，测试了沙柳刨花板的物理力学性能，针对测试结果提出了改善刨花极性能的措施。  相似文献   

湿地松与马尾松人工林木材物理力学性质的比较研究   总被引：2，自引：0，他引：2  

庄奇 《中南林业调查规划》2004,23(2):58-59

通过对湿地松和马尾松人工林木材物理力学性质的测定和比较分析,结果表明:湿地松人工林木材密度、干缩系数和除冲击韧性以外的力学强度均稍大于马尾松人工林木材,而冲击韧性则恰恰相反.经差异显著性t检验表明:湿地松和马尾松木材物理力学性质指标中顺纹抗压强度、抗弯强度、弦面顺纹抗剪强度和冲击韧性差异极显著,气干密度、基本密度、径面顺纹抗剪强度和端面硬度差异显著,除此之外的其余指标差异不显著.  相似文献   

Initial shapes of stress-strain curve of wood specimen subjected to repeated combined compression and vibration stresses and the piezoelectric behavior     

Takahisa Nakai  Hiroyuki Yamamoto  Masatoshi Hamatake  Tetsuya Nakao 《Journal of Wood Science》2006,52(6):539-543

This study investigated the relationship between the initial shape of the stress (σ)-strain (ε) curve of a Chamaecyparis obtusa wood specimen subjected to repeated combined compression and vibration stresses at various angles between the fiber direction and load direction and the piezoelectric behavior. The main findings of the study are: (1) the σ-ε curve became convex initially, and then the stress was proportional to the strain. The σ-ε curve had almost the same shape during both loading and unloading. (2) The σ-piezoelectric voltage (P) curve was nonlinear, with a maximal point or cusp on the curve, which had almost the same shape during both loading and unloading, as was also observed for the σ-ε curve. (3) The plot of the first derivative of the stress [dσ/dε (= σ′)] against ε was nonlinear. The σ′-ε and P-ε curves at various angles were fairly similar. (4) The stress at the maximal point (or cusp) of the σ-P curve decreased with an increase in the angle between the fiber direction and load direction. The tendency of the stresses was very similar to that of Young’s modulus and compression strength calculated from Hook’s law and Hankinson’s law, respectively.  相似文献   

浅谈辊压法木材防护浸注技术   总被引：6，自引：0，他引：6  

孙耀星  刘一星  方桂珍 《林产工业》2005,32(2):8-10

简述了国内外木材浸注技术的最新研究进展;重点论述了木材防护浸注厅法--辊压法,讨论了辊压法的浸注原理,以及与传统木材浸注方法--真空加压法在设备、工艺方面的比较,明确了控制压缩率的重要作用,并尝试应用计算机图像处理技术测量计算木材体积空隙率来确定压缩率,建议辊压浸注处理大青杨时,压缩率可试取50％及以下。  相似文献   

木质复合材料研究概况   总被引：4，自引：0，他引：4  

徐滨雁 《林业科技情报》2002,34(4):42-43

新型木质复合材料可缓解由于我国现有林木资源总量不足和森林资源质量不高而形成的资源危机,所以木质复合材料将是新世纪人们关注和研究的重点领域。  相似文献