湿地松种源生长量、材性的变异与优良种源综合选择

对湖北省荆州市林业科学研究所湿地松种源试验林的生长量及材性进行了研究，结果表明：湿地松种源间的树高、胸径、材积等生长量因子以及晚材率和木材基本密度均存在着显著差异，且具有中等程度的广义遗传力。基本密度径向变异模式以及递增为主，年轮段基本密度呈正态分布。木材密度早晚期相关性随树龄增大而增加，用5年生木材密度能可靠地预测12年生木材密度。各种源生长量因子与木材基本密度相关性有正有负，相关性大小与种源有关。木材密度与晚材率的正相关显著。生长量、木材密度与原产地地理、气候因子相关不显著；晚材率与纬度正相关，与年均温负相关显著。综合评估表明S1，S3、S20为较优种源。     

苹果木醋液对畜禽粪便的杀菌试验

本文用苹果木醋液对畜禽粪便进行杀菌试验,将木醋液原液及按1：1,1：2稀释液作为杀茵剂,分别作用于鲜粪30min及60min,然后接种于普通平板上培养24h,结果显示木醋液能有效的杀灭细菌,原液作用60min后几乎能杀死粪便中的全部细菌;苹果木醋液对鲜畜禽粪便有很好的杀菌效果,可用于畜禽粪污处理。     

长江中下游滩地和低丘陵地水杉木材性质的研究

通过对水杉木材解剖性质、物理性质等的研究,结果表明：水杉木材管胞长度３．５６５ｍｍ、管胞宽度３６．８４μｍ、单壁厚７．７１ｕｍ、长宽比９６．６、壁腔比０．７６、柔性系数０．５８、次生壁Ｓ２层微纤丝角１６．６７°、基本密度０．２７５ｇ／ｃｍ３、１７年生平均年轮宽度５．８ｍｍ、晚材率１５．５２％。自髓心向外,木材管胞长度、宽度、胞壁厚、柔性系数、长宽比呈递增趋势,壁腔比和微纤丝角呈递减趋势,木材基本密度开始减小,约８年后开始上升。水杉可作为长江中下游低丘陵和滩地的重要发展树种,木材可作为造纸原料。     

珍稀及待开发树种材性及用途的研究

选择了大别山五针松、杉松、三角枫、山核桃,梓树、朴树、连香树、毛,丝棉木,刺揪,铜钱树,棠梨、琅琊榆,醉翁榆及榔榆等１５个树种,观察和记载木材解剖特征,分析其化学成分,测试物理性质,力学性质以及加工性质。根据上述各树种的材质、材性和加工性质,大别山五针松、山核桃、梓树、连香树,琅琊榆,醉翁榆及榔榆等木材优良,应属于稀有和珍贵的木材树种。杉松、三角枫、朴树、毛、丝棉木、刺揪、铜钱树及棠梨等木材质量好,价值高,可以有计划的发展作为重要的商品材开发利用。本文还根据各树种木材的特性,结合实际调查,提出这些树种木材的合理加工和利用的意见。     

桃果深加工及其副产物综合利用研究进展

本文阐述了现阶段国内外主流桃果深加工制品的发展现状,分析了国内外对桃果果壳和桃仁等副产物的综合利用方式,并对我国桃产业发展前景进行了总结与展望。     

Evaluation of wood cutting forces in dry and wet conditions by small-scale chipping tests applying different analysis methods

ABSTRACT

The aim of this paper is to study the effect of high moisture content in comparison to dry timber on the resulting cutting forces based on experimental small-scale chipping tests. Therefore, a wood chipper for single cuts is designed and different species of Austrian locally growing trees are utilized. The test specimens are investigated in almost dry and soaked wet conditions. The resistance of wood is measured utilizing a force sensor and the signal during the cutting process is subsequently analysed by two different methods. The results reveal that the mean value of the acting force during cutting is 38–81% minor compared to the maximum force. Even though the peak of the dynamically acting load is measured for just a comparably small time range, it reveals an impact on the fatigue behaviour of the tool as well as the tool supporting material. Hence, an approach of evaluated load spectra is applied to include the load distribution of the chipping process. The effect of dry and wet wood on the cutting resistance is examined, whereby wood exhibiting a high moisture content of 30–40% changes the acting load up to 98%, depending on the method of analysis.     

Influence of fan speed on airflow distribution in a batch kiln

Abstract

This study reports experimental data of airflow distribution as a function of fan speed in an industrial batch kiln. Measurements were conducted with 20 hot-film anemometers distributed throughout the load at two occasions. The main result was that airflow distribution did not change significantly as the fan speed was reduced, and no positions where the air movement stopped were found. It was also found that relatively more air ran in the bolster spaces in comparison to the adjacent packages as the air ran through the load.     

木醋在蓝莓扦插繁殖与栽培中的应用

[目的]研究木醋在蓝莓扦插繁殖及栽培中的作用.[方法]以蓝莓茎段和组培苗为材料,通过对扦插生根时间、生根综合指标、株高及土壤pH的测定,分析木醋在蓝莓扦插繁殖及栽培中的作用.[结果]木醋喷施能缩短蓝莓插穗的生根时间,各处理均比对照显著降低,稀释100倍处理生根时间最短;不同处理生根综合质量均比对照明显提高,稀释200倍处理生根综合质量最高.蓝莓移栽初期,各处理间株高无显著性差异;随着木醋喷施次数的增多,各处理间植株的生长出现了差异,稀释200倍处理蓝莓的株高最高.木醋喷施有降低土壤pH的作用,稀释100倍木醋pH与对照相比降低幅度最大.[结论]可以将木醋作为一种植物生长调节物质应用于蓝莓的繁殖与栽培中.     

论MOOC与大数据技术对国家级精品木材学课程教学的挑战

针对东北林业大学木材科学与工程专业的木材学课程在教学模式、师生交流、学术交流、资源共享、人才培养模式等教学环节上存在的问题,通过阐述MOOC与大数据技术地融合给木材学教学带来的变化,指出MOOC与大数据技术将给木材学课程教学带来的挑战,以期有效解决问题,促进木材学课程的变革.     

教学改革视角下苗族木结构建筑的特征探究

基于木材科学与工程专业课程教学内容改革的视角,以贵州黔东南地区苗族木结构建筑具有的独特结构特征和审美特征为研究内容,通过对木结构建筑的结构设计和艺术设计的学习,补充和完善现有教学课程体系,增强学生的综合实践能力和审美水平,对新型农村民居建设具有一定启发作用.