Effects of Liquid Crystalline Epoxy Resin on the Properties of Bio-based Cardanol-furfural Resin北大核心CSCD

By using polarized optical microscopy, differential scanning calorimetry, scanning electron microscopy and impact strength measurements,the effects of liquid crystalline on the morphologies, thermal properties and mechanical properties of the composite resins were studied. It was found that the synthesized 4,4-diglycidyloxybiphenyl (BP) and sulfanilamide (SAA) were used to generate novel liquid crystalline (LC) epoxy resins notably. The results revealed that the curing of the cardanol-furfural resins was accelerated and the thermal properties were considerably improved by adding the LC epoxy resins.When the addition of BP-SAA was 50%, the glass transition temperature increased from 60.4 ℃ to 70.2 ℃, and the thermal decomposition temperature increased from 300.3 ℃ to 377.4 ℃, respectively. When the addition of BP-SAA was 30%, the impact strength of the modified resins was 15 kJ/m2 and about three-fold higher than that of the unmodified counterpart. © 2018, Editorial Board of «Chemistry and Industry of Forest Products». All right reserved.     

三北地区大扁杏栽培管理实用技术

大扁杏是我国三北地区特有的经济树种之一。它适应性强,经济价值高。一般10～15年生杏平均收入1.5万元/(ｈ·ａ)。杏仁除含有多种营养成分外,还含有抗癌物质维生素Ｂ17,广泛应用于食品、医药等工业,是外贸出口产品,深受外商欢迎。栽植大扁杏是三北地区人民脱贫致富的一个?..     

加快绿色化,迎接新世纪

在知识经济走向我们的时代,木材胶粘剂必须加快绿色化,成为生态材料,进入高技术产业行列。在我国,下世纪前十年内,低毒脲醛肢将成为主流产品;现用树脂胶的改性技术日益成熟,如三聚氰胺改性脲醛（ＭＵＦ）、苯酚改性脲醛（ＰＵＦ）等;利用天然资源制造的可降解胶粘剂用量提高,如木素胶、单宁胶、豆蛋白胶等;室温固化型胶粘剂品种增加,新产品用胶不断出现,如异氰酸酯等。另外,集科研、开发、生产于一体的专业胶粘剂产业将较快增长。     

山莓叶中茶多酚的提取工艺研究

用正交实验方法研究了从山莓叶中提取茶多酚的提取工艺,得到了提取茶多酚的最佳工艺条件。该工艺条件具有操作简单、产量高、无毒无污染、成本低等特点。     

浅谈住宅水暖工程渗漏原因和防治措施

论述了住宅水暖工程渗漏的原因和防治措施,对从事住宅施工安装和管理工作者提供了借鉴经验。     

减少森林砍伐和退化机制中的碳评估探讨

涉及森林的气候行动能够最直接地降低大气二氧化碳的增长速度, 并可以最低代价赢得在其他工业部门发展减排技术的时间。通过在发展中国家实施REDD+, 能够显著地减少温室气体排放。在监测、报告和核查(MRV)温室气体排放上存在的技术问题, 以及渗漏、额外性和永久性等政策问题, 是REDD+程序中最主要的障碍。为了实现全球气温升高不超过2℃临界点的目标, 需要国际体系和组织、各国政府和私营部门发挥重要的作用, 需要各国加强建设监测、报告、核查森林碳储量的能力, 需要开发和利用地面测量碳储量计算模型和卫星遥感数据判读转化技术。文中介绍了对实现REDD+可能有重大贡献的国际体系和组织的最新动态以及国家级MRV系统的特征, 探讨了实现全球森林碳评估的途径以及卫星数据在森林碳评估中的应用等, 提出了我国在参与REDD+活动中存在的挑战和应该采取的对策。     

Effects of drought and nitrogen addition on photosynthetic characteristics and resource allocation of Abies fabri seedlings in eastern Tibetan Plateau

Abies fabri (Mast.) Craib is an endemic and dominant species in typical sub-alpine dark coniferous forests distributed in mountainous regions of the eastern Tibetan Plateau, China. We investigated the ecophysiological responses of A. fabri seedlings to short-term artificially-applied drought, nitrogen addition alone, and the combination of these treatments. Drought was created by excluding natural precipitation with an automatically controlled plastic roof that covered the seedlings. Nitrogen fertilization was applied weekly by spraying over seedlings with ammonium nitrate solution. Experiment results showed that drought caused a reduction in photosynthetic nitrogen use efficiency and leaf mass per area. Nitrogen addition enhanced photosynthetic performance by increasing net photosynthetic rate. In the drought plots, nitrogen addition increased net photosynthetic rate and instantaneous water use efficiency. These results showed that applied nitrogen improved plant water use efficiency and N accumulation in plant organs under drought conditions. Especially under drought conditions more N was concentrated into needles by applied nitrogen as compared with other organs. In conclusion, our results indicated that the combination of nitrogen addition and drought may result in positive effects on A. fabri seedlings in the short-term.     

炎帝陵区森林旅游综合开发研究

炎帝是中华民族的始祖之一，炎帝陵是他的安寝之地。炎帝陵区旅游资源十分丰富，开发炎帝陵旅游资源有利于促进我省旅游业的发展。文中从炎帝陵区森林旅游开发、炎帝陵旅游理念的创立、开发炎帝陵旅游区的建设规划和创建旅游线路的设想等方面进行了论述。     

几个杨树品种低温与变温胁迫对比试验

以几种常见杨树品种为试材,在不同时期进行了低温胁迫试验,通过相对电导率测试及生长恢复情况调查,分析了不同时期低温对杨树发生冻害的影响,结果显示：在冬季树木深休眠期持续的低温对杨树具有一定的伤害,但伤害程度不大;初春树木萌动期低温对杨树伤害较大。根据此结论,进一步开展变温胁迫试验,结果显示：高温和低温的变温对不同杨树伤害较大,而且变化幅度越剧烈,造成伤害越严重。