Crown morphology of Norway spruce from usual tree measurements

Intr0ducti0nNorwayspruce(PiceaabiesKarst)is0l1eoflI1e111ostimportal1tc011iferinFra11ce.lnl99l,tI1etotaIareaofNorwaysprLICewasestimatedt0be723000I11112.ItsvoIUmewasl27Inilli0I1m3.Tl1eanl1uaIvoILl111eiI1crc-mentwas5.74millionm3.ltiswideIyacceptedII1atIargeri11itialspacingssI1ouldbeusednow.l111940's,thedensity0ftl1epIantatiol1rangedfr0m5000to10000stems/hm2.Nowtl1einitiaIdensityvariesbetweenI000to250Ostems/I1m2.TI1eIargestspacit1g111aybe650~800stems/hm2.S0ithasasignifica11cetostLldyt…     

降低除湿式木材干燥能耗初探

介绍了除浊式木材干燥机分类,除湿机的合理选配和除湿干燥室的正确配置问题。分析了除湿机运行工况对能耗的影响。并提出了相应的降低能耗的一些措施。     

Structural mechanics of wood composite materials I: Ultrasonic evaluation of internal bond strength during an accelerated aging test

This research attempts to observe indirectly the variation of internal bond characteristics for wood composite materials during accelerated aging test treatment using ultrasonic pulse-transmission techniques. Particleboard (PB) and oriented strandboard (OSB) were the representative specimens. The transit time of the ultrasonic wave propagating through the samples along the nominal length and thickness directions was recorded using an apparatus called PUNDIT (C.N.S. Electronic, London). The transit times were measured in the samples under an oven-dried condition after treating them with boiling water at different treating time stages, and the velocity was then calculated based on the transit time. Examination of the internal bond strength conducted on the same samples was done according to JIS A 5908. A study of the relations among springback, internal bond strength, and velocity indicated that a high correlation existed between ultrasonic velocity measured in the length or thickness direction and the internal bond strength for the PB specimen, but no significant correlation was observed between the velocity measured in the length direction and the internal bond strength for the OSB specimen. The results of this research suggested that ultrasound techniques can be applied to predict or evaluate the internal bond state of some wood-composite materials made of relatively small particles, such as PB especially, during accelerated aging test treatment processes.Part of this paper was presented at the 47th annual meeting of the Japan Wood Research Society, Kochi, April 1997     

农业劳动者素质与促进农业增长方式的转变

从提高农业劳动者素质对促进农业增长方式转变的意义及其重要性论述插入手,分析了中国农村劳动者整体素质的现状,提出了全面提高农业劳动者综合素质的几点政策建议。     

Study on the Preparation of High Strength Wood Granular Activated Carbons

本文阐述木屑、竹屑、松根,油茶壳等木质废料（材）以及白炭制取高强度定形或不定形颗粒活性炭的关键技术问题,并深入探讨了粘结成型理论与工艺,对成品的性能用途方向亦作了分析     

双孢菇的品种类型及菌种质量

随着双孢菇栽培的普及和菌种选育技术的提高,其品种资源日趋丰富.不同的双孢菇品种类型需要不同的栽培管理技术;不同的生产区域,选用的菌株也不尽相同.明确品种类型,因地制宜的选择优良品种及使用高质量的菌种,是确保双孢菇高产优质的关键因素.     

论木材检验中造材后的量材改锯问题

本文论述了木材检验中造材后量材改锯中存在的问题。如原木的一断面腐朽为薪材,而另一端为优良断面的木材,如何进行量材改锯等等。并提供了木材改据参考一览表。     

木材工业和可持续发展──世界木材工业的发展趋势

进入80年代以来,世界经济已开始由工业化社会向生态化社会发展,林业和木材工业的目标也开始由传统的以生产木材和木材制品为主向可持续经营,实现森林的生态、环境、社会和木材等多方面效益发展。木材工业的进一步发展面临木材资源紧缺、环境保护压力增加等重大问题的挑战。遵循可持续发展原则,加强工业人工林的培育和利用,发展环境协调技术和产品,改进林业和木材工业的竟争地位,更好地适应市场的需求,实现林业和木材工业的协调发展,是木材工业通向未来之路。     

湿热蒸汽处理木质材料温度动态监测研究

作为一种替代溴甲烷熏蒸木材的技术,湿热蒸汽处理具有突出的环保性。试验通过智能换热站提供湿热蒸汽,设计了钢材框架悬挂耐高温气囊的试验装置,对原木、樟子松拼板、樟子松锯材和单板层积材进行湿热蒸汽处理,并对木材内部升温进行动态监测。利用温度记录仪收集了各温度监测点4 h内的温度实时数据,以及耐高温气囊内部的环境温度实时数据,对湿热蒸汽环境下木质材料不同位置的升温过程进行比较分析,结果表明:木质材料与湿热蒸汽的接触面积是影响其升温速率的关键因素;较大尺寸的木质材料升温速率更高;人造板材与天然木材升温速率基本相同。     

我国木地板业发展概况与展望

论述了近10年来我国木质地板发展历程及现状,并展望了木质地板未来的发展趋势。近10年来我国木质地板产业进入快速发展时期。2004年我国木质地板产量已达2.57亿m2,仅次于欧盟,成为名符其实的地板生产大国。同时,也面临新的挑战,出现了一些新的问题。面对激烈竞争的市场,必须实施资源大整合,提高企业管理水平和产品档次,从而实现跨越式大发展。