木材工业用胶粘剂的现状及发展趋势

主要介绍了脲醛树脂、酚醛树脂、三聚氰胺－甲醛树脂、木质素、单宁、异氰酸酯等木材工业用胶粘剂的研制状况及世界木材资源和木材工业的发展趋势。     

大"手术"带来大变化——靖州县木材检查站改革侧记

近年来，靖州县林业局为加强木材检查站的建设，采取“轮岗交流、健全机制、保障经费、严格执法”等措施，检查站的“保护”功能明显增强。全县森林资源由“八五”时期的６９４万立方米上升到现在的７６３万立方米。２０００年１２月７日，怀化市资源林政管理工作会议在靖州召开，会议号召全市学习靖州县木材检查站的改革经验。改革之一：实行轮岗交流，提高执法队伍素质。由于非法经营木材的高额利润，不法分子千方百计地拉拢贿赂木材检查站的检查人员，近年来，全县有１２名检查人员纷纷落马，其中，振兴检查站全站人员被查出有不同程度的…     

《加快推进木材节约和代用工作意见》正式执行

国家发改委、科技部、财政部、人事部、建设部、铁道部、农业部、商务部、税务总局、质检总局、环保总局、林业局近日联合提出的《关于加快推进木材节约和代用工作意见》得到国务院正式批复，其主要内容：     

Thermal diffusion in Masson pine wood

In order to analyze the effects of the temperature gradient on moisture movement during the highly intensive microwave-vacuum drying, thermal diffusion of Masson pine wood was studied. Internal distribution of temperature and moisture in Masson pine samples sealed by epoxy resin and aluminum foil was measured, the magnitude of thermal diffusion was calculated and the influencing factors of thermal diffusion were discussed. Results showed that with the transfer of moisture toward the low temperature in wood, opposite temperature and moisture gradient occurred. The initial moisture content （MC）, temperature and time are important factors affecting this process; the thermal diffusion is in proportion to wood temperature, its initial moisture and time. The temperature and distance from hot surface is strongly linearly correlated, and the relationship between MCs at different locations and distance from the hot end surface changes from logarithmically form to exponentially form with the increase in experimental time.     

Design of wood/montmorillonite (MMT) intercalation nanocomposite

Studying new wood composites through nano science and technology (NSC) will develop new compounding theory of wood, and accelerate the combination of new technology, wood science, material science and other disciplines. The compounding of wood and inorganic MMT on nanoscale molecular level has high potential to greatly improve the mechanical properties, fire retardance, abrasion resistance, decay resistance, dimensional stability and other properties of wood. Based on the great achievements of polymer/montmorillonite (MMT) nanocomposites, this paper reviewed nano intercalation compounding methods (i.e. in-situ intercalative polymerization and direct polymer intercalation), and discussed the structure, properties and modification of montmorillonite (MMT). According to the main chemical components and particular structure of wood, the authors discussed the liquefaction and plasticization of wood, compared the dissolvability and meltability between wood and polymer, and then systematically put forward the basic idea, technological processes and schematic diagram to prepare wood/MMT nanocomposites (WMNC). The key technology to prepare WMNC is either to introduce delaminated MMT nanolayers into wood with the help of some intermediate polymers, or to obtain liquefied wood or plasticized wood from the complicated natural composite. It is applicable and effective to realize wood/MMT nanoscale compounding with the help of proper intercalation agent and medium polymer through the proposed “one-step” or “two-step” impregnating processes.     

Decay Detection of Ancient Wood Rafters in Tibet by Stress Wave Testing Method

Visual classification and stress wave non-destructive testing technology were adopted to evaluate the decay status of ancient Populus wood members （rafters） replaced from the Potala Palace. The decay status of wood members was evaluated by stress wave testing and visual observation. For most of the ancient wood members, the evaluation results by two methods were consistent with each other. Also stress wave testing techniques can find the internal wood member decay to eliminate the hidden hazard for ancient wood members, and offer relatively accurate quantitative information for the safety status of ancient wood members. Thus during the maintaining for ancient architectures, visual observation combined with stress wave testing techniques is a good way to evaluate the degradation of ancient wood members.     

马来西亚开展森林采伐培训课程以提高森林经营水平

马来西亚古晋2006年10月10日消息：国际热带木材组织对马来西亚的热带林经营非常赞赏，认为与一些非洲和南美洲国家相比，马来西亚的森林经营做得十分出色。     

欢迎订阅2008年《南京林业大学学报（自然科学版）》

《南京林业大学学报（自然科学版）》由南京林业大学主办，创刊于1958年，是以林业为主的综合类学术期刊。主要报道森林资源与环境、水土保持与荒漠化、木材工业与技术科学、林业机械与电子工程、林产化学与工业、园林植物与风景园林、林业经济与管理、土木工程等以及有关边缘学科的研究成果。另设置专栏集中报道重点项目、     

铜街子水电站木筏过坝牵引设施结构设计

铜街子水电站位于四川省乐山大渡河铜街子地段。是国家重点工程。总库容量2.0亿m~3,坝高76m,利用落差41m,装机容量60万kw。该电站以发电为主,兼顾漂木。木材过坝方案采用原木收漂编筏后,通过筏闸进行过坝。在筏闸内、进口和出口等地段设置木筏过坝设施。过木筏闸为两级闸室,筏室宽14m,筏室高28m,每级长     

马占相思木材和树皮性质研究进展

概述了国内外马占相思木材解剖性质、化学性质、物理性质、力学性质、加工性能、木材耐久性及功能性改良、树皮化学性质等方面的研究成果,展望了马占相思木材科学方面的研究方向,为马占相思木材和树皮性质的进一步研究提供有益参考。