作为生产复合材料板的一种可供选择的原材料,竹材获得越来越多的关注。用Betung竹材(Dendrocalamus Asper(Schultes.F)Backer Ex Heyne,马来甜龙竹)制得的三层OSB来评估刨片结构长度和预处理技术对其物理力学性能,以及耐久性方面的影响...作为生产复合材料板的一种可供选择的原材料,竹材获得越来越多的关注。用Betung竹材(Dendrocalamus Asper(Schultes.F)Backer Ex Heyne,马来甜龙竹)制得的三层OSB来评估刨片结构长度和预处理技术对其物理力学性能,以及耐久性方面的影响。结果显示,在垂直于纹理方向上,刨片长度对于其断裂模量(MOR)和弹性模量(MOE)的影响很大。将刨片放入乙酸酐溶液中浸泡对于提高OSB尺寸的稳定性略有改善。在实验条件中,将板材浸入冷水和乙酸酐溶液提高了OSB受到地下白蚁侵蚀的抗性。实验中所有生产OSB的参数都比CSA(加拿大标准协会)0437.0标准的最低要求要高。展开更多
Based on the regularities of temperature fluctuation,the atmo- sphere below an altitude of 71km above ground is divided into 6 sublayers. For each of them the calculation formulae of temperature and pressure are deriv...Based on the regularities of temperature fluctuation,the atmo- sphere below an altitude of 71km above ground is divided into 6 sublayers. For each of them the calculation formulae of temperature and pressure are derived.The calculated results at any altitude in the range under considera- tion agree well with the values laid down in the table of“U.S.Standard At- mosphere”.From this the formula for the refractive-index structure coeffi- cient C_N^2,of much importance in the research of adaptive optics,is obtained for the corresponding altitudes.展开更多
文摘作为生产复合材料板的一种可供选择的原材料,竹材获得越来越多的关注。用Betung竹材(Dendrocalamus Asper(Schultes.F)Backer Ex Heyne,马来甜龙竹)制得的三层OSB来评估刨片结构长度和预处理技术对其物理力学性能,以及耐久性方面的影响。结果显示,在垂直于纹理方向上,刨片长度对于其断裂模量(MOR)和弹性模量(MOE)的影响很大。将刨片放入乙酸酐溶液中浸泡对于提高OSB尺寸的稳定性略有改善。在实验条件中,将板材浸入冷水和乙酸酐溶液提高了OSB受到地下白蚁侵蚀的抗性。实验中所有生产OSB的参数都比CSA(加拿大标准协会)0437.0标准的最低要求要高。
文摘Based on the regularities of temperature fluctuation,the atmo- sphere below an altitude of 71km above ground is divided into 6 sublayers. For each of them the calculation formulae of temperature and pressure are derived.The calculated results at any altitude in the range under considera- tion agree well with the values laid down in the table of“U.S.Standard At- mosphere”.From this the formula for the refractive-index structure coeffi- cient C_N^2,of much importance in the research of adaptive optics,is obtained for the corresponding altitudes.
