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研制的林木球果前期处理设备,可在球果采集后预先对批量球果进行循环搓揉处理,使球果鳞片松动,经本设备处理后的球果,在烘裂处理时的处理效率为未经该设备处理的2-3倍。 相似文献
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研制的林木球果前期处理设备,可在球果采集后预先对批量球果进行循环搓揉处理,使球果鳞片松动.经本设备处理后的球果,在烘裂处理时的处理效率为未经该设备处理的2~3倍。 相似文献
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刺梨果汁榨汁工艺中护色的研究 总被引:5,自引:1,他引:4
对刺梨果汁榨汁工艺中护色问题进行了研究。在刺梨果实榨汁前对原料进行汽蒸、水煮、食盐溶液浸泡、抽真空等预处理技术,刺梨果实榨汁后采用明胶处理、抗坏血酸处理、葡萄糖氧化酶和热处理等方法处理果汁。各处理果汁存放24h后,测定褐变度、维生素C和多酚的含量。结果表明:采用刺梨果实榨汁前进汽蒸和抽真空处理和榨汁后进行适宜浓度的明胶处理后,可有效保持刺梨果汁的颜色。 相似文献
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对落叶后的银杏枝条进行春化处理,结果表明:不同处理温度和处理时间对枝条的开花期和开花率影响较大。用2,5,8℃经过5d以上处理的银杏枝条扦插后均可开花。广东省和平县及阳山县银杏枝条经2℃处理比5℃和8℃处理开花早,开花率高,且在同一温度处理下,春化时间愈长,枝条的开花期愈早,开花率也较高。顺德市银杏枝条在各种处理条件下的开花率变化不大,但开花日期受处理温度的影响,且温度愈低,开花日期愈早。 相似文献
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采用除草清杂处理1a后,1年1次和1年2次处理校正虫口减退率分别为39.98%和51.33%,有虫株率与对照三者之间有显著差异,处理2a后,三者之间的有虫株率有极显著差异,1年2次处理效果较好,2a后,有虫株率减退率42.30%。人工挖虫防治后1a有虫株率极显著下降,校正有虫株率减退率为78.28%,2a后持续效果达75.45%。 相似文献
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用高效混凝过滤法处理草类制浆黑液,混凝净化后的黑液与中段废水及部分白水一起采用活性污泥法处理,经过处理后的废水可达到国家造板废水排放标准。 相似文献
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日本甜柿果实软化、乙烯生成和呼吸的关系把采后的日本甜柿品种“次郎”果实用乙醇溶液处理24小时后发现果实乙烯生成量急剧上升,处理48小时后果实开始软化。乙醇的浓度越高,乙烯释放的越快,果实的软化也就越快。用CO_2处理则抑制了乙烯的生成,降低了果实的呼... 相似文献
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DUAN Xinfang BAO FuchengResearch Institute of Wood Industry Chinese Academy of Forestry Beijing P.R.China 《中国林业科技(英文版)》2004,3(4):59-64
In order to study the influence of wood microstructure on wood dyeing, eleven parameters of wood microstructure and 5 parameters of wood dyeing effects for 34 pieces of wood boards from 5 trees of Chinese white poplar (Populus tomentosa) were determined and the multiple regression analysis between the factors of wood microstructures and the parameters of wood dyeing effects were made. The regression results show that each variable of wood dyeing effects has higher relationship with wood microstructures, and multiple correlation coefficients between each variable of wood dyeing effects and wood microstructures are 0.483 6~0.799 8. The main factors of wood microstructures influencing wood dyeing of Chinese white poplar are proportion of wood ray, proportion of vessel and proportion of wood fiber according to comparing the standardized regression coefficients of multiple regression equation. 相似文献
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Differences in wood properties between juvenile wood and mature wood in 10 species grown in China 总被引:3,自引:0,他引:3
F. C. Bao Z. H. Jiang X. M. Jiang X. X. Lu X. Q. Luo S. Y. Zhang 《Wood Science and Technology》2001,35(4):363-375
This study examined the intrinsic differences in various wood properties between juvenile wood and mature wood in 10 major
reforestation species in China. Comparisons between juvenile wood and mature wood were made in both plantation- and naturally-grown
trees. Considerable differences in most wood properties were found both between plantation-grown juvenile wood and mature
wood, and between naturally-grown juvenile wood and mature wood. This suggests that wood properties of plantation-grown trees,
to a large extent, depends on their juvenile wood contents, and can thus be manipulated effectively through rotation age.
In general, the longer the rotation age, the lower the juvenile wood content, and the stronger the mechanical properties of
the plantation-grown woods. However, the differences between juvenile wood and mature wood vary with wood properties and species.
In general, juvenile wood and mature wood have less difference in chemical composition than in anatomical and physico-mechanical
properties. Compared to the softwoods studied, the hardwoods appear to have less difference between juvenile wood and mature
wood.
Received 25 June 1999 相似文献
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木材碳学是近年来兴起的一门科学, 其主要研究内容包括木材碳素的储存量、木材储能、人工林木材固碳增汇与优质木材培育技术及木质产品固碳延伸等方面。文中简述了木材碳学研究中木材固碳量与含碳率、木材固碳量的影响因素、木材固碳量与木材热值的关系以及木质材料固碳量和固碳延伸等方面的研究现状, 并对今后的研究方向进行了展望。 相似文献
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木材科学与技术研究新进展 总被引:1,自引:0,他引:1
吴义强 《中南林业科技大学学报(自然科学版)》2021,(1):1-28
木材作为世界四大基础材料中(钢铁、水泥、塑料、木材)唯一的可再生资源,广泛应用于家具、建筑、能源、新材料等领域,与人们的生活息息相关,已成为国民经济重要支柱产业.从木材微观分子生物学到宏观木结构,再到新型木质纳米材料进行全面阐释,对于木材科学与技术领域的基础理论研究和重大核心技术突破具有重要指导意义.木材科学与技术已发... 相似文献
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随着天然林保护工程的实施 ,我国木材资源结构正在进行由主要利用天然林木材到利用人工林木材的转变 .由于人工林木材所含幼龄材比例相当高 ,木材资源结构的变化反过来必将对我国的木材加工工业及林产品工业带来一系列影响 .该文综述了我国木材资源的现状 ,比较了人工林幼龄材与天然林成熟材的木材基本特性 ,探讨了人工林木材性质特征与营林培育的关系 ,阐述了木材质量与不同最终用途之间的关系 ,并对加强开展人工林木材性质的研究提出了几点建议 相似文献
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文章介绍了难胶合材的主要特征。论述了影响难胶合材胶合的几个主要因素,诸如解剖结构特征、抽提物、PH值、密度和表面机械加工特征。 相似文献
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The consumption of wood and wood products in Greece is based greatly on imports necessitating every year a great proportion of public expenditures. The study of wood and wood product imports consequently, is important to the national economy and can be a useful guide for the forest farms, wood industries and wood firms. In this paper the Greek aggregate import demand for Unprocessed wood (such as logs) Processed wood (such as sawn wood), Veneer Crafts (such as veneer sheets) and Wood Manufactures during the period 1969–2001 is empirically analysed using the linear approximation of quadratic AIDS (QUAIDS) model. Imports of Unprocessed wood, Veneer Crafts and Wood Manufactures are found to be price-elastic, in contrast to Processed wood imports. Processed wood, Veneer Crafts and Wood Manufacture imports are found to be expenditure-elastic while Unprocessed wood is found to be an inferior good. Substitution possibilities are found to be significant between Veneer Crafts and all the remaining wood imports and between Processed wood and Unprocessed wood. 相似文献