太阳能热水器环保型高效保温材料的开发与应用     

周帆  潘丽珠  马昭健  谢刚 《大众科技》2014,(3):88-90

聚氨酯硬泡沫因导热系数较低、成型方便而作为太阳热水器水箱主要的保温材料,但其成型后收缩性较大以及环保性能有待改进等原因,使太阳能热水器保温材料聚氨酯硬泡沫的高效保温性能、环保性能、生产质量的工艺性能等成为许多生产企业的关注点。文章依据本企业的"太阳能热水器水箱发泡组合物"发明专利,介绍、分析太阳能热水器新的环保型高效保温材料生产技术的开发与应用,取得较好的效果。  相似文献   

黄芪中药种衣剂对黄芪的包衣效果研究     

孔祥军  佟春香 《黑龙江科技信息》2014,(12):91-92

主要发生在苗期的根腐病以及花荚期的蚜虫病,是黄芪生长发育过程中经常发生的病虫害,本文应用课题组自制的种衣剂对黄芪种子进行包衣,不包衣的黄芪种子为对照组,通过田间试验,以黄芪种子发芽率、黄芪根腐病发生情况、蚜虫发生程度三者为考察对象,从而针对自制黄芪中药种衣剂对黄芪的包衣效果进行初步的研究。  相似文献   

Evaluation of the effect of phase change materials technology on the thermal stability of Cultural Heritage objects     

《Journal of Cultural Heritage》2014,15(5):470-478

The use of phase change materials (PCMs) in civil buildings as an effective thermal energy storage solution has been well documented in literature and proven in the field. When applied to Cultural Heritage, PCMs’ technology needs to be adapted to specific requirements. Besides the important objectives of economic return and human comfort, the indoor microclimatic conditions have to be suitable for conservation purposes. The application of PCMs’ technology to Cultural Heritage has been investigated within the European MESSIB (Multi-source Energy Storage System Integrated in Buildings) project. Firstly, several methodologies of incorporation of PCMs in different materials were studied and tested. The thermal properties of gypsum panels and silicon coatings incorporating micro-encapsulated PCMs in the form of powder and emulsion were analysed in the laboratory. Then, PCMs incorporated in gypsum panels in contact with a wooden panel were tested and their effect on the thermal behaviour of the wooden panel was evaluated under thermal cycles in a climatic chamber. PCMs incorporated in silicon coatings in contact with a painting were also tested. Moreover, gypsum panels containing PCMs were tested in the S. Croce Museum in Florence, Italy, where the microclimatic monitoring has shown thermal conditions potentially dangerous for the works of art preserved. The research performed both in the laboratory and on the field confirmed the effectiveness of the PCMs as thermal storage solutions, but also gave evidence on an important drawback when the material incorporating PCMs is in direct contact with an object of art.  相似文献   

不同热喷涂距离下T400涂层抗磨损性能研究     

陈喜娟  周勇  张卫涛 《环球赛鸽科技》2015,(11)

采用超音速火焰喷涂(HVOF)技术制备出T400涂层。利用显微硬度试验机测试了两种涂层的硬度,通过橡胶轮磨粒磨损试验和扫描电镜(SEM)对两种涂层的涂层磨粒磨损性能和磨损形貌进行分析,利用静态液压万能试验机进行涂层剥离测试分析。结果表明院涂层的硬度随着喷涂距离的增大而增加。 T400涂层磨损失效主要以形成平行于磨料滑行方向的犁沟为主。  相似文献   

环氧树脂改性坡缕石沥青涂料的制备研究     

王有朋  吕维华  索陇宁  何小荣  唐蓉萍 《兰州石化职业技术学院学报》2014,(1):5-7

根据高分子共混改性的基本原理,制备了环氧树脂乳液改性坡缕石乳化沥青涂料及防腐涂层,采用电化学极化曲线法和电化学交流阻抗谱研究了该涂料涂层电化学腐蚀行为。结果表明,钠基坡缕石不仅克服了沥青耐磨力、粘结力差和软化点低的缺点,同时与环氧树脂性能互补改善了沥青基涂料冷脆开裂等性能。  相似文献   

无机胶粘贴碳纤维布对钢筋混凝土梁高温性能的影响     

张婷婷  吴志堂  张鑫 《温州职业技术学院学报》2014,(2):55-58

为研究无机胶粘贴碳纤维布对钢筋混凝土梁高温性能的影响,对3根不同加固方式及防火方式的钢筋混凝土梁进行高温试验。试验结果表明,无机胶及防火涂料对钢筋混凝土梁温度场及跨中挠度有重要作用;与防火性能较差的有机胶相比,无机胶具有较好的耐高温性能,可应用于碳纤维布加固混凝土工程中;防火涂料在火灾过程中具有较好的防火和隔热作用,在防火设计中不可忽略。  相似文献   

Developing schools as professional learning communities： The TL21 experience     

Anthony Malone Gregory Smith 《美中教育评论》2010,7(9):106-114

Over the last 2 decades, Irish schooling and society have gone through a period of significant structural and policy-driven change. To meet the emerging needs of the knowledge/learning society, schools and teachers are challenged to develop their capacities as ＂active learning communities＂. This places greater demands on teachers and schools to reflect on their classroom practices, to utilise a wider repertoire of pedagogic styles more suited to the needs of the 21st century learners and so that meaningfully collaborate with their fellow professionals. Teaching and Learning for the 21st Century （TL21） was a 4-year （2003-2007） multi-pronged research and development project involving the Education Department at the National University of Ireland, Maynooth （NUIM） and 15 post-primary schools. The project sought to address a number of key aims in terms of developing schools as professional learning communities, including addressing the isolation and insulation which teachers can, and do experience in their day-to-day professional lives and prioritize quality in teaching and learning as a key challenge for school development planning. This paper attempts to succinctly frame the key developments and findings which emerged over the duration of this process.  相似文献   

风机盘管系统吊顶渗水问题分析     

徐娓 《茂名学院学报》1999,(3)

该文分析了风机盘管系统出现吊顶渗水问题的原因,讨论了为避免渗水在设计和安装上应注意的问题。  相似文献   

激光熔覆中熵合金铁钴镍涂层的工艺及组织性能     

邓景泉 《安阳工学院学报》2022,21(2):26-31

用高能球磨制备等原子比铁(Fe)钴(Co)镍(Ni)铁镍钴复合粉体,用激光熔覆方法制备复合粉铁镍钴体合金涂层。用OM、HV、XRD、SEM、EDS、SVET等对复合粉体及熔覆合金层进行了组织表征及性能测试。结果表明,复合粉体经3 h高能球磨后均匀细化,平均尺寸从35μm到15μm左右,镍晶格有一定畸变,有新相Co3Fe7产生;用优化后的激光熔覆工艺激光功率2000 W,激光扫描速度10 mm/s,保护Ar气流速度12 L/min制备中熵熔覆合金FeCoNi涂层;XRD、SEM、EDS表明熔覆层合金是单一的面心立方(FCC)相,Fe,Co,Ni成分均匀分布,没有金属间化合物产生;熔覆层的HV约是243,在0.5 mol/L氯化钠溶液中熔覆层的SVET表明耐腐蚀性能好。  相似文献