木材干燥窑风机回转可调控引导送风系统

为改善常规木材干燥窑能耗大、送风不均匀和效率低等不足,研制了干燥窑风机回转送风装置和可调控引导送风装置.实践表明,这两种装置可使送风气流量增加,木材干燥窑节电60%,干燥周期平均缩短2天;省去挡风板,使干燥窑高度降低约0.5 m,节省了干燥窑初期投资约2万元;材堆装卸简便,设备维护保养方便.     

薄木饰面杨木集成板材的研制

以人工林杨木为原料,开发生产饰面集成板材,可以大大提高其产品的附加值。最终产品检测结果表明,产品达到了日本(JAS)标准要求。这将为人工林杨木的进一步开发利用提供一条新的途径。     

工业林木荷木材化学成分及其变异的研究

按照国家木材化学成分分析标准,对工业林木荷木材化学成分进行了测定,结果表明12年生和14年生木荷木材化学成分含量为：热水抽提物6．93％和5．06％;1％NaOH抽提物18．42％、17．42％;苯醇抽提物1．64％、2．48％;纤维素48．06％、50．72％;多戊糖20．99％、20．68％;木质素24．20％、23．10％;pH值为5．46和4．99。以上7个指标在树干不同高度的差异均未达到显著性水平。而热水、苯醇抽提物含量和pH值在两树龄间的差异达到1％显著水平,1％NaOH抽提物和主要化学成份含量的差异不显著。     

三种速生杨木材物理力学性质的比较研究

测试、分析比较了不同树龄3种速生杨木材的物理力学性质,结果表明:①树种对物理力学性能有较大的影响,三倍体圆叶毛白杨的物理力学性能最好,三倍体裂叶毛白杨次之,中林-46最差;方差分析表明,3种杨树的主要物理力学性质均达到显著和极显著差异。②树龄对物理力学性质的影响不大,随着树龄的增长,不同杨树木材的密度已趋于稳定,但力学性能有上升的趋势;方差分析表明,抗截切强度和抗弯强度受树龄影响较大,差异达到显著水平,其他性质无显著差异。     

新型纳米杀菌剂在木材防腐中的应用

介绍了当前国外正在研发的新型纳米木材防腐剂(纳米金属类和纳米栽体类)及其可能存在的对环境和人体的安全隐患问题.     

木材液体渗透性的改善方法

归纳了影响木材液体渗透性的因素(木材结构、抽提物、微生物、含水率和干燥方法)及其改善方法(化学法、生物法、物理法),着重介绍了压缩法,并提出今后改善液体渗透性的研究方向.     

Comparison of predictions of baking volume using large deformation rheological properties

Three large deformation rheological tests, the Kieffer dough extensibility system, the D/R dough inflation system and the 2 g mixograph test, were carried out on doughs made from a large number of winter wheat lines and cultivars grown in Poland. These lines and cultivars represented a broad spread in baking performance in order to assess their suitability as predictors of baking volume. The parameters most closely associated with baking volume were strain hardening index, bubble failure strain, and mixograph bandwidth at 10 min. Simple correlations with baking volume indicate that bubble failure strain and strain hardening index give the highest correlations, whilst the use of best subsets regression, which selects the best combination of parameters, gave increased correlations with R²=0.865 for dough inflation parameters, R²=0.842 for Kieffer parameters and R²=0.760 for mixograph parameters.     

毛白杨木材乙二醇醇解过程中木质素结构的FT-IR、1H NMR分析

为探讨木材乙二醇醇解过程中木质素结构的变化机理,以毛白杨磨木木质素(MWL)为研究对象,采用红外光谱和核磁共振等手段对醇解前后的木质素结构变化进行了分析.发现毛白杨木质素属于典型的愈创木基-紫丁香基型(GS型)木质素,G/S比值为1.37.醇解过程中木质素单元间β-O-4连接键大量断开,共轭羰基减少,甲基芳基醚键部分断开,产物中发现了大量新的酚羟基结构.醇解产生的低分子组分有芳香醚类、脂肪醚类、酚类、芳香酸类、不饱和酮类等物质.木质素大分子断裂的同时也有缩合反应发生.     

National inventories of down and dead woody material forest carbon stocks in the United States: Challenges and opportunities

Concerns over the effect of greenhouse gases and consequent international agreements and regional/national programs have spurred the need for comprehensive assessments of forest ecosystem carbon stocks. Down and dead woody (DDW) materials are a substantial component of forest carbon stocks; however, few surveys of DDW carbon stocks have been conducted at national-scales around the world. This study uses the DDW survey of the United States as a case study to examine the challenges of inventorying DDW at a national scale, reviews how dead wood carbon pools are currently estimated in the National Greenhouse Gas Inventory (NGHGI), and suggests opportunities for improving such inventories. The US currently estimates national DDW carbon stocks using models with standing live tree attributes as predictor variables, calibrated using preliminary DDW field estimates. In recent years, implementation of a national DDW inventory has resulted in inventory-based DDW estimates. National field-based DDW estimates follow the national patterns of DDW carbon dispersion seen in earlier model-based estimates. Although the current DDW inventory provides fairly repeatable measurements within a statistically defensible national sample design for producing national estimates of DDW carbon stocks, improving numerous aspects of the DDW survey would may improve the accuracy and precision of C estimates reported in the NGHGI.     

形态学双梯度算子在木材腐朽图像边缘检测中的应用

根据数学形态学的思想和木材图像的特性,选取适当的结构元素,通过腐蚀、膨胀、开与闭运算的加权组合,构造出形态学双梯度算法,并将它应用于木材腐朽图像的边缘检测。通过与经典边缘检测算法对比,该方法提取的图像边缘更加的准确、完整和连续;显现出更好的抗噪声能力和边缘检测能力,实验结果验证了该方法的可行性与有效性。