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抗水树电缆耐水树特性的研究
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作者 吴炯 王伟斌 《电线电缆译丛》 1989年第2期1-7,F004,共8页
关键词 树电缆 特性
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一种新型阴离子型多异氰酸酯水性固化剂的制备与性能研究 被引量:1
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作者 袁立新 《化工时刊》 CAS 2022年第5期5-7,47,共4页
本文制备了含烷氧基硅烷的叔氨,在与环己氨基磺酸中和后,用其对六亚甲基二异氰酸酯(HDI)三聚体进行改性反应,成功制备了可水分散的一种新型阴离子型多异氰酸酯水性固化剂,讨论了磺酸叔铵盐化合物改性剂的用量和改性工艺,及其对双组分水... 本文制备了含烷氧基硅烷的叔氨,在与环己氨基磺酸中和后,用其对六亚甲基二异氰酸酯(HDI)三聚体进行改性反应,成功制备了可水分散的一种新型阴离子型多异氰酸酯水性固化剂,讨论了磺酸叔铵盐化合物改性剂的用量和改性工艺,及其对双组分水性丙烯酸聚氨酯涂层性能的影响。经过试验结果表明:当含烷氧基硅烷的叔氨与环己氨基丁磺酸合成的阴离子型亲水性改性剂占总质量的3.45%,反应温度80℃,合成的有机硅改性离子型HDI水性固化剂与普通的水性HDI固化剂相比,形成的涂膜具有高光泽、耐热水和硬度。 展开更多
关键词 HDI性固化剂 有机硅改性性固化剂 耐水特性
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江西引种中山杉造林试验研究 被引量:8
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作者 王丽艳 罗坤水 +2 位作者 陈新红 周晨 金洪平 《南方林业科学》 2018年第5期24-27,36,共5页
本文对中山杉引种江西造林作了全面调查,研究了中山杉在湖岸湿地造林生长表现,以及中山杉118在鄱阳湖滩涂地造林的耐水能力和生长表现,结果表明,中山杉在湖岸湿地表现出较好的速生特性,胸径年均生长量能达2cm;夏季6-7月间能耐水长达3个... 本文对中山杉引种江西造林作了全面调查,研究了中山杉在湖岸湿地造林生长表现,以及中山杉118在鄱阳湖滩涂地造林的耐水能力和生长表现,结果表明,中山杉在湖岸湿地表现出较好的速生特性,胸径年均生长量能达2cm;夏季6-7月间能耐水长达3个月,其中全没顶在水里长达27 d,成活率高达89.8%,表现出极强的耐水特性,是鄱阳湖滩涂地适生造林的好树种。 展开更多
关键词 中山杉 引种 区域试验 耐水特性 鄱阳湖 滩涂地
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Physiological Basis of Photosynthetic Tolerance to Photooxidation and Shading in Rice 被引量:13
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作者 李霞 焦德茂 《Acta Botanica Sinica》 CSCD 2000年第12期1271-1277,共7页
Thirty genotypes from rice germplasm were identified under photooxidation and shading condition and divided into four basic types : (1) cultivars tolerant to both photooxidation and shading, (2) cultivars tolerant to... Thirty genotypes from rice germplasm were identified under photooxidation and shading condition and divided into four basic types : (1) cultivars tolerant to both photooxidation and shading, (2) cultivars tolerant to photooxidation but sensitive to shading, (3) cultivars tolerant to shading but sensitive to photooxidation, and (4) cultivars sensitive to photooxidation and shading. A comparative study of photosynthetic characteristics of a cultivar (cv. Wuyujing 3) that is tolerant and a cultivar (cv. Xiangxian) that is sensitive to both photoinhibition and shading showed that the photochemical efficiency of PSⅡ ( F v/F m ) and the content of PSⅡ_D1 protein in the tolerant cultivar “Wuyujing 3” decreased less under photoinhibition conditions as compared with “Xiangxian”. Under photooxidation conditions, superoxide dismutase was induced rapidly to a higher level and the active oxygen O - built up to a lower level in “Wuyujing 3” than in “Xiangxian”. At the same time, the photosynthetic rate decreased by 23% in “Wuyujing 3” vs. 64% in “Xiangxian”. Shading (20% natural light) during the booting stage caused only small decreases (7%-13%) in RuBisCO activity and the photosynthetic rate in “Wuyujing 3” but showed marked decreases (57%-64%) in “Xiangxian” which corresponded to the decreases in grain yield in the two cultivars (38% and 73%, respectively). The correlation analysis showed that the tolerance to photooxidation is mainly related to PSⅡ_D1 and that to shading is mainly related to RuBisCO activity. This study provided a simple and effective screening method and physiological basis for crop breeding in enhancing tolerance to both high and low radiation. 展开更多
关键词 PHOTOOXIDATION SHADE RICE PSⅡphotochemical efficiency RuBi0
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Physical and combustion properties of briquettes from sawdust of Azadirachta indica 被引量:1
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作者 O.A.Sotannde A.O.Oluyege G.B.Abah 《Journal of Forestry Research》 SCIE CAS CSCD 2010年第1期63-67,I0003,共6页
The study was undertaken to investigate the properties of cassava starch and gum arabic bonded briquettes from the sawdust of Azadirachta indica. The briquettes were produced using a Jack press at an average pressure ... The study was undertaken to investigate the properties of cassava starch and gum arabic bonded briquettes from the sawdust of Azadirachta indica. The briquettes were produced using a Jack press at an average pressure of 10.7 kg.cm^-2. The sawdust and binders were mixed at ratios of 100:15, 100:25, 100:35 and 100:45 in weight, respec tively. The briquettes produced were subjected to physical and combustion tests. Both the physical and combustion properties of the briquettes vary with binder types and binder levels (p 〈 0.05). The result shows that briquettes bonded with starch gave better performance based on density of 0.546 g.cm^-3, durability rating of 95.93%, heating value of 33.09 MJ.kg^-1, percentage of fixed carbon of 84.70% and low ash and volatile matter of 3.35% and 11.95%, respectively, while briquette bonded with gum arabic has density of 0.425 g.cm^-3, durability rating of 94.85%, heating value of 32.76 MJ.kg^-l, percentage of fixed carbon of 87.30% and low ash and volatile matter of 4.45% and 8.75, respectively. Since the aim of briquetting is to produce briquette that will serve as a good source of fuel and support combustion, the best briquette was produced when the sawdust-starch ratio and sawdust-gum arabic ratio was 100:25 and 100:35, respectively. 展开更多
关键词 Azadirachta indica BRIQUETTE binder level durability rating combustion properties
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Comparative mapping of QTLs for Al tolerance in rice and identification of positional Al-induced genes 被引量:7
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作者 毛传澡 杨玲 +4 位作者 郑炳松 吴运荣 刘非燕 易可可 吴平 《Journal of Zhejiang University Science》 EI CSCD 2004年第6期634-643,共10页
Aluminum (Al) toxicity is the major factor limiting crop productivity in acid soils. In this study, a recombinant inbreed line (RIL) population derived from a cross between an Al sensitive lowland indica rice variety... Aluminum (Al) toxicity is the major factor limiting crop productivity in acid soils. In this study, a recombinant inbreed line (RIL) population derived from a cross between an Al sensitive lowland indica rice variety IR1552 and an Al tolerant upland japonica rice variety Azucena, was used for mapping quantitative trait loci (QTLs) for Al tolerance. Three QTLs for relative root length (RRL) were detected on chromosome 1, 9, 12, respectively, and 1 QTL for root length under Al stress is identical on chromosome 1 after one week and two weeks stress. Comparison of QTLs on chromosome 1 from different studies indicated an identical interval between C86 and RZ801 with gene(s) for Al tolerance. This interval provides an important start point for isolating genes responsible for Al tolerance and understanding the genetic nature of Al tolerance in rice. Four Al induced ESTs located in this interval were screened by reverse Northern analysis and confirmed by Northern analysis. They would be candidate genes for the QTL. 展开更多
关键词 Aluminum tolerance Quantitative trait loci (QTL) Expressed sequence tag (EST) Gene Rice (Oryza sativa L.)
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Leaf turgor loss point at full hydration for 41 native and introduced tree and shrub species from Central Europe
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作者 Norbert Kunert Ivana Tomaskova 《Journal of Plant Ecology》 SCIE CSCD 2020年第6期754-756,共3页
The last years,Central European forests have suffered from drought as a direct consequence of climate change.All these forests have a long management history and it lies in the landowner’s responsibility to replant d... The last years,Central European forests have suffered from drought as a direct consequence of climate change.All these forests have a long management history and it lies in the landowner’s responsibility to replant damaged forests.Hence,landowners and the government are searching currently for species suitable to replant in areas affected by tree die-offs.It is a matter of fact that good knowledge of drought resistance of species is a critical measure for the current replanting efforts.We determined a widely recognized trait for leaf drought tolerance(leaf water potential at turgor loss point at full hydration,πtlp)in 41 woody species native or introduced in Central Europe.The osmometric rapid assessment method was used to measure the leaf osmotic potential at full hydration(πosm)of sun-exposed leaves and converted toπtlp.Meanπtlp of the native species was−2.33±0.33 MPa.The less negativeπtlp was found in the introduced species Aesculus hypocastania and was at−1.70±0.11 MPa.The most negativeπtlp,and thus the potentially highest drought tolerance,were found in the introduced species Pseudotsuga menzesii and was at−3.02±0.14 MPa.High or less negativeπtlp is associated with lower drought tolerance,whereas low or more negativeπtlp stands for higher resistance to drought stress.For example,the two native species Illex aquifolium and Alnus glustinosa are species naturally associated with moist habitats and are characterized by the least negativeπtlp of−1.75±0.02 and−1.76±0.03 MPa,respectively. 展开更多
关键词 osmotic potential drought tolerance leaf hydraulic trait permanent wilting point tree mortality woody species climate change
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