恒线速旋切机旋切时间的计算

恒线速旋切机旋切时间的计算姜贵君，甘新基，欧阳富（吉林林学院）单板旋切机按旋切时被旋切木段的线速度的变化情况，可以分为变线速旋切机和恒线速旋切机。由于变线速旋切会导致不均匀的载荷及影响生产率和单板的质量等缺点，故现多采用恒线速旋切的旋切机。但恒线速旋...     

单板旋切机恒线速数控系统

设计了用于单板旋切机的恒线速数控系统，其异步电动机采用变频方法调速，操作方便，节省电能。     

无卡轴旋切机变速进给模型与恒线速旋切运动轨迹模型的研究

详细分析了无卡轴旋切机的工作原理,推导了旋切过程中刀刃进给速度与圆木直径的数学模型,同时得出旋切时间的近似计算式。从中可知,旋切过程中刀刃进给速度必须按一定规律变化才能保证旋切机正常工作。建立了旋切机恒线速旋切的运动轨迹模型,推导出旋切机恒线速旋切时间的精确计算式,并在此基础上提出了旋切时间简便的近似计算式。这些研究结果均可用于指导设计和进行实际生产。     

恒线速旋切机旋切时间的计算

推导出恒线速单板旋切机旋切时间的精确计算公式，并在此基础上提出了简便的近似计算公式，它对设计和生产实践有一定参考价值。     

提高重氮氨熏中速晒图纸质量的研究

目前国产重氮氨熏晒图纸普遍存在显影慢，晒图与熏图不能同步，线条色泽不够鲜艳及分辨率低等弊病。在晒图纸感光液中加入脲或五元杂环硫醇类衍生物等药剂，可有效地解除以上弊病。文章还对提高晒图纸的感光速度及严格控制涂药量，稳定晒图纸的各项技术指标作了介绍。     

中国竹亚科特有属区系地理的数值研究——Ⅰ.基本成分的分析

本文应用植物区系数值分析方法研究了中国竹亚科特有属的数量与各省区间区系丰富性及其相似性。结果表明;西南至华南尤其西南地区既是中国竹亚科特有属的多样性,分化与发展中心,又是其起源中心。文末还描述了慈竹属1个新组合即吊丝单。     

毛竹林生态系统能流经济阈值模拟研究

Using the data obtained from sample plots of Phyllostachys pubescens, the dynamic model of energy flow ofPhyllostachys pubescens ecosystem was built in this paper. Based on the model, the analysis of energy flow was combined or-ganically with the methods of economical threshold, the concept of economical threshold of energy flow of Phyllostachys pu-bescen ecosystem (EET) was put forward, and the effect of compensation and super compensation were discussed further-more. The results showed that the economical threshold of energy flow of Phyllostachys pubescens ecosystem were EETleaf =0.3133@ x3, EETbranch = 0.2440@x1 (where x1 and x3 represent energy of leave and branches respectively) ;the effect ofcompensation and super compensation existed in Phyllostachys pubescens, and the compensation point and super compensati-on point of Phyllostachys pubescens were 31.33 %, 13.61% ( expressed in defoliation rate) and 24.40%, 11.94% ( ex-pressed in branch-cut rate)respectively. Therefor, this paper will not only enrich the study of energy ecology in the Phyl-lostachys pubescens ecosystem, but also provide a scientific basis for the management of Phyllostachys pubescens.