Effect of Planting Density and Fertilizer Application on Fiber Yield of Ramie （ Boehmeria nivea ）

As the most important cultural practices for ramie (Boehmeria nivea) production,the single effects of plant density and nitrogen (N),phosphorus (P),potassium (K) fertilization on yield are well documen...     

Optimization of Fermentation Medium for Cordyceps brasiliensis Using Response Surface Methodology

The composition of fermentation medium for producing Cordyceps brasiliensis mycelium was optimized using response surface methodology. A Plackett-Burman design was applied to screen potential key factors selected on the basis of preliminary experiments, and the steepest ascent method was adopted to approach the approximate optimal medium composition. Finally, central composite design and response surface methodology were applied to define more precisely the optimal composition of the fermentation medium. Our data revealed glucose and beef extract to be the most influential parameters, and the composition of the optimal fermentation medium (100 mL) was determined to consist of 4.46 g glucose, 2 g soluble starch, 4 g silkworm powder, 2.93 g beef extract, 0.10 g KH2PO4 and 0.15 g MgSO4·7H2O.     

后期热固化处理对竹基纤维复合材料性能的影响

对竹基纤维复合材料进行两种条件(80℃处理8h和50℃处理24 h)的热固化处理后,观测其表观形貌,并进行拉伸、压缩、水平剪切性能以及疲劳性能检测.结果表明:经过热固化处理后,竹基纤维复合材料表面有不连续的微小裂纹产生,其拉伸、压缩、水平剪切性能略有提高,疲劳性能则无显著变化.     

溶胶－凝胶法制备SiO2/NR复合材料的力学性能

将SiO2与天然橡胶的制备工艺相结合，先以价格低廉的水玻璃为原料，采用溶胶－凝胶法制备SiO2溶胶和凝胶，再以天然鲜胶乳共沉－共凝制备SiO2/NR复合材料，考察了制备工艺条件对复合材料力学性能的影响。结果表明，制备SiO2/NR复合材料较适宜的复合工艺为院水玻璃与乙酸乙酯反应温度30益，乙酸乙酯和水玻璃溶液中所含SiO2的摩尔比n为0.8∶1，水玻璃浓度为6.5%。当SiO2用量为10份时，复合材料的拉伸强度和撕裂强度分别达到了33.4MPa和47.1kN·m-1。     

混凝土模板用复合竹碎料板工艺研究

用正交试验法研究了施胶量、热压温度和热压时间3个因素对复合竹碎料板物理力学性能的综合影响．结果表明：热压温度是影响板材物理力学性能的主要因素．较佳工艺参数为，施政量12％，热压温度150℃，热压时间22min，板材物理力学性能能满足混凝土模板材料性能的需要．     

Interface Characteristics of Wood-hybrid Composites

In recent years, many researchers all over the worldhave used inorganic compounds to improve theproperties of wood, for inorganic compounds are cheapand can be obtained easily. Furthermore, they havegood functions and are environmental-friendly if theyare well controlled (Chen Zhilin, 2003). Wood-hybridcomposite is a kind of organic-inorganic hybridmaterial(OIH). OIH means that organicmacromolecule material and inorganic material becomea mixed in molecule level to get excellent capabilities…     

尾巨桉、马占相思和马尾松人工林的土壤肥力比较

通过改进的内梅罗(Nemerow)综合指数对尾巨桉、马占相思、马尾松三种人工林的土壤肥力进行了综合评价,结果表明三种人工林A层土壤肥力综合指标值是尾巨桉>马占相思>马尾松,B层土壤肥力综合指标值是马占相思>马尾松>尾叶桉。综合分析表明尾巨桉林、马尾松林和马占相思林土壤肥力相差不大。     

资源节约型高性能竹木复合板的研制

采用多种无屑切削方式,将竹材、木材及制材、旋切剩余物——边皮、木芯,加工成不同形态的构成单元,组合成合理的复合板坯结构,热压胶合成一种竹木复合板材。检测结果表明：半成品加权平均利用率可达90．1％,成品板材的出材率为63．1％,居各类型胶合板之首；板材纵横强度之和：静曲强度为113．1MPa,弹性模量为9578MPa,是一种资源节约型高性能的竹木复合板材。     

菊叶薯蓣组织培养及快速繁殖

菊叶薯蓣组织培养以大田栽培苗地上部分幼嫩茎段作外植体。芽诱导培养基为MS+6-BA0.5～2.0mg·L-1+NAA0.1mg·L-1,继代增殖培养基为MS+6-BA1.0mg·L-1+NAA0.1 mg·L-1,生根培养基1/2MS+NAA0.5mg·L-1,每个过程均培养30d,每节段增殖2～3倍,生根率为85%以上。移栽基质为土壤∶珍珠岩(1∶3),遮光率为80%,保持较高湿度,每7d喷施1/2MS无机盐,1个月后成活率可达60%～80%。     

径向竹帘复合板的研究——制板工艺

通过对径向竹帘复合板的制板工艺、物理力学性能、经济效益的分析表明 :径向竹帘复合板具有物理力学性能高、板面质量好、竹材利用率高、胶粘剂用量少、热压周期短、产量高、能耗低等优点 ,是一种竹材资源全方位、高效加工利用的新途径。