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海南气候环境对RTV硅橡胶力学性能影响的研究 被引量:1
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作者 柴明侠 陈聪 +1 位作者 黄孝辉 王有治 《有机硅材料》 CAS 2015年第1期31-34,共4页
将3种室温硫化(RTV)有机硅结构密封胶拉伸粘结性试件放置于海南热带环境试验基地暴露5年,每年取一定数量的试样测试其拉伸粘结性能,研究湿热带气候对其拉伸粘结性能的影响。结果表明,在海南湿热气候环境下连续暴晒5年后,双组分脱醇型有... 将3种室温硫化(RTV)有机硅结构密封胶拉伸粘结性试件放置于海南热带环境试验基地暴露5年,每年取一定数量的试样测试其拉伸粘结性能,研究湿热带气候对其拉伸粘结性能的影响。结果表明,在海南湿热气候环境下连续暴晒5年后,双组分脱醇型有机硅结构密封胶的最大拉伸粘结强度除第1年下降8%外,后面4年都在增长,共增长了14%;单组分脱醇型有机硅结构密封胶的最大拉伸粘结强度在约5%的范围内波动;单组分脱肟型有机硅结构密封胶的最大拉伸粘结强度下降14%。3种密封胶在最大拉伸粘结强度时的伸长率在第1年都有较大幅度下降,双组分密封胶的下降幅度为35%,两种单组分密封胶的下降幅度约50%;后面4年在第1年基础上小幅波动。湿热气候环境下均无粘结破坏。 展开更多
关键词 海南 湿热带气候 有机硅 结构密封胶 脱醇型 脱肟型 拉伸粘结性能 幕墙
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Growth characteristics of multipurpose tree species, crop productivity and soil properties in agroforestry systems under subtropical humid climate in India 被引量:3
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作者 M. Datta N. P. Singh 《Journal of Forestry Research》 SCIE CAS CSCD 2007年第4期261-270,共10页
Multipurpose tree species (MPTs) were studied in an agroforestry arboretum under subtropical humid climate in Northeast India. Out of 12 MPTs planted under agroforestry systems, Acacia auriculiformis in spacing of 2... Multipurpose tree species (MPTs) were studied in an agroforestry arboretum under subtropical humid climate in Northeast India. Out of 12 MPTs planted under agroforestry systems, Acacia auriculiformis in spacing of 2 m × 2 m (2500 stems·hm^-2) could have the potentiality to meet the timber/fuelwood requirement due to its high wood production of 635 m^3·hm^-2 with mean annual increment (MAI) of 2.54×10^-2 m^3.treel.a^-1 in a short rotation period of 10 years. Thus, A. auriculiformis is a short rotation forest tree species suitable to grow in subtropical humid climate. On the other hand, at 16 years of age, Eucalyptus hybrid and Michelia champaca in spacing of 3 m × 3 m (1111 stems.hm^2) produced appreciably high timber volume of 315 m^3.hm^-2 and 165 m^3.hm^-2 with MAI of 1.77×10^-2 m^3.tree^-1·a^-1 and 0.92×10.2 m^3.tree^-1.a^-1, respectively. At 16 years of age, Gmelina arborea produced a timber volume of 147 m^3.hm^-2 with MAI of 1.47×10^-2 m^3.tree^-1.a^-1 followed by Samania saman (140 m^3.hm^-2), Albizziaprocera (113 m^3·hm^-2) and Tectona grandis (79 m3.hm^-2) with MAI of 1.40, 1.13 and 0.78 × 10^-2 m^3 .tree^-1a^-1, respectively in 4 m × 4 m spacing (625 stems.hm^-2). Gliricidia maculata and Leucaena leucocephala could be used as live fences around the farm boundary to supply their N-rich leaves for mulch as well as manure to crops. In agroforestry arboretum, direct seeded upland rice (Oryza sativa - variety, AR-11), groundnut (Arachis hypogaea - variety, JL-24) and sesamum (Sesamum indicum - variety, B-67) were grown during the initial period upto 8 years of tree establishment. Under other MPTs, there was a reduction in crop productivity as compared to open space. After 8 years of tree establishment, horti-silvi and silvi-pastoral systems were developed and pineapple (Ananas comosus - variety Queen), turmeric (Curcuma longa -variety RCT -1) and cowpea (Vigna sinensis - variety Pusa Barsati) as forage crop were raised. The productivity of pineapple, turmeric and cowpea was comparatively high under Azadirachta indica. The productivity of horticultural and forage crops in association with trees such as G. arborea, A. procera, S. saman, T. grandis and M. champaca of high timber value could be harnessed as viable agroforestry systems. Changes in soil properties were also monitored. Amelioration of soil acidity, increase in soil organic carbon, and enhanced humification of soil humus, high nutrient availability, low soil erodibility and high surface soil (0-15 cm) moisture availability were noted in soils under MPTs. 展开更多
关键词 Multipurpose trees Subtropical humid climate Growth characteristics Timber volume Crop productivity Soil organic car-bon Soil humus Nutrient availability Soil erodibility indices Soil moisture.
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A Study of Compressive, Flexural, Heat Humidity and Heat Transfer of Autoclaved Aerated Concrete Mixed Polypropylene Fiber under Climate of Bangkok
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作者 Borvom Israngkura Na Ayudhya PeerapolDeshadanuwong 《Journal of Civil Engineering and Architecture》 2013年第5期575-584,共10页
This paper presents the experimental results of study on mechanical properties, heat and humidity transfer through AAC (autoclaved aerated concrete) mixed with PP (polypropylene fiber). The performance of AAC-PP i... This paper presents the experimental results of study on mechanical properties, heat and humidity transfer through AAC (autoclaved aerated concrete) mixed with PP (polypropylene fiber). The performance of AAC-PP is investigated in terms of compressive strength, flexural strength, splitting tensile strength, porosity, heat and humidity capacity. The results are compared with control specimen made of autoclaved aerated concrete only (Non-AAC-PP). Results showed that ultimate compressive strength, flexural strength and splitting tensile strength can be obtained when the content of polypropylene fiber added at 0.75% by volume while porosity of specimens rapidly decreased when content of fiber addition increased above 1% of its volume. Additional, a comparison study of heat and humidity transfer properties on AAC-PP walls showed that the AAC-PP house had lower indoor air and moisture content than (Non-AAC-PP) house. Therefore, addition PP fiber on AAC increased mechanical properties, enhanced hygrothermal performance and reducing moisture content under tropical climate of Bangkok. 展开更多
关键词 Autoclaved aerated concrete Non-AAC-PP polypropylene fiber.
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