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In early spring 2009 we present you, with special
pride and pleasure, the first issue of volume 60 of the
journal Drvna industrija (Wood Industry). The journal
in your hands has been publishing sci...
Fire retardants for wood
wood combustion of wood fire retardants fire retardant coatings chemical impregnation by pressure-treating
2009/7/21
Along with many advantages, wood as traditional building material also has some disadvantages. One of them is the flammability. The most usual way to improve the fire performance of wood is by treat...
Utilization of contribution margin in the costing system in production of components for wood working machines
calculation costing cost profit contribution margin
2009/7/21
The aim of this paper is to propose optimization of costing method for planning a production-sales programme of the chosen engineering enterprise dealing with the production of components for wood w...
Comparison of percentage of wood fracture surface analyzed by computer and by ISO 6238 in determining the quality of adhesive bonds
gluing quality portion of wood failure subjective objective methods
2009/7/21
This paper presents the results of measuring and estimating the percentage of wood fracture surface in testing the quality of adhesive bonds by using two methods. The first method is based on ISO 62...
Changes in value-added wood product manufacturer perceptions about certification in the United States from 2002 to 2008
certification United States wood products value-added manufacturers
2009/7/21
Certification is a voluntary mechanism which involves assessing either forest management practices or chain-of-custody tracking through supply chains against a set of standards. Certification is bec...
Influence of plywood grain direction on sandwich panel bending properties
sandwich panel veneer plywood stress FEM structural construction
2009/7/21
This paper investigates the influence of plywood grain direction on bending properties of a sandwich panel, as well as on stress distribution in each layer. Experimental sandwich panels (tnom= 29 mm...
Performance of thermally modified timber (TMT) in outdoor application – durability, abrasion and optical appearance
blue stain cracks decking faç ade weathering
2009/7/21
Thermally modified timber (TMT) is increasingly offered in Europe as an alternative to preservative treated timber. TMT durability in field tests as well as its moisture sorption behaviour in fa&cce...
多指标综合评分法研究姜黄色素的提取工艺
多指标综合评分法 姜黄色素 提取 二苯基苦基苯肼自由基 羟基自由基
2012/8/4
姜黄色素主要含有姜黄素、脱甲氧基姜黄素和二脱甲氧基姜黄素等抗氧化成分。本研究以得率和抗氧化活性为考察指标,在正交试验的基础上,采用多指标综合评分法研究了温度、乙醇体积分数、提取时间和料液比对姜黄色素的得率、二苯基苦基苯肼自由基(DPPH·)和羟基自由基(·OH)清除率的影响。综合评分法得到的姜黄色素优化提取工艺为:提取温度80℃、乙醇体积分数90%、提取时间1.5h、料液比1:8(g:mL),该工...
以丙烯酸改性松香(AR)为原料,先与草酰氯反应合成丙烯酸改性松香酰氯(AR-Cl),然后与甲基丙烯酸-2-羟基乙基酯进行酯化反应合成了丙烯酸改性松香(2-甲基丙烯酰氧基乙基)酯(AR-2-HEMA),并分别采用FT-IR、GC-MS、13CNMR和差示扫描量热仪(DSC)对其结构和性能进行表征。研究结果表明,丙烯酸改性松香(2-甲基丙烯酰氧基乙基)酯主要由丙烯海松酸(2-甲基丙烯酰氧基乙基)酯(3...
以得率和抗氧化活性为考察指标,在正交试验的基础上,采用多指标综合评分法研究了温度、乙醇体积分数、提取时间和料液比对姜黄色素的得率,二苯基苦基苯肼自由基(DPPH·)清除率和羟基自由基(·OH)清除率的影响。综合评分法得到的姜黄色素优化提取工艺为:提取温度 80℃,乙醇体积分数 90%,提取时间 1.5 h,料液比为1:8,该工艺条件下姜黄色素的得率为 4.37%,DPPH·清除率为 8.58%,·...
研究了蒸汽爆破预处理对玉米秸秆化学组成变化及纤维素酶水解得率的影响,并采用扫描电镜(SEM)、X射线衍射仪(XRD)和红外光谱(IR)对玉米秸秆纤维结构特性进行了分析。结果表明,蒸汽爆破预处理对纤维素影响不显著,半纤维素含量大幅度降低,木质素含量也有所降低。纤维素酶水解得率随着爆破压力的增大和维压时间的延长而增加,当蒸汽压力为 1.6 MPa,维压时间 9 min 时所得固体渣经纤维素酶水解,得率...
木质素CP-GC-MS法裂解行为研究
木质素 居裂解 CP-GC-MS
2012/8/8
采用居里点热裂解-气相色谱-质谱(CP-GC-MS)联用分析技术,以碱木质素为原料,研究了裂解温度对木质素快速裂解产物组成及其含量的影响。结果表明,木质素居裂解主要生成酚类化合物,GC含量可达 60%。低温主要生成愈创木酚结构单元为主体的酚类化合物;在300～360℃ 之间,酚类化合物GC含量随裂解温度升高而提高,愈创木酚基本单元类化合物占主体,占酚类化合物的 90% 左右;裂解温度进一步提高,酚...
马尾松松针甾醇的精制及气相色谱-质谱分析
马尾松松针 植物甾醇 精制 气相色谱-质谱
2012/8/9
采用溶剂结晶法从松针聚戊烯醇生产过程得到的副产品中分离精制松针甾醇,利用气相色谱-质谱联用技术对其化学成分进行了分析。结果表明,从精制松针甾醇中共分离鉴定出6种植物甾醇,分别是β-谷甾醇 89.32%、豆甾烷醇 5.07%、菜油甾醇 3.90%、豆甾-7-烯-3-醇 0.42%、麦角甾烷醇 0.35%、豆甾-5,24(28)-双烯-3β-醇 0.25%, 6种植物甾醇含量之和占总量的 99.31%...
水酶法提取辣木油的工艺研究
辣木油 提取方法 中性蛋白酶 水酶法
2012/8/5
通过中性蛋白酶水相溶剂中提取辣木油的单因素和正交试验,研究了影响辣木油水酶法提取的主要因素,得出了水酶法提取辣木油的最佳工艺条件。研究结果表明,最佳条件为:酶用量为辣木籽质量的3.0%,液料比9:1(mL:g),温度50℃,孵育时间18h,pH值5.0的条件下,辣木油平均得率超过28.6%。