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Anaerobic digestion of maize hybrids for methane production
Anaerobic digestion maize hybrids methane production
2010/5/12
The world in the 21st century is faces problems due to growing energy consumption and diminishing supplies of fossil fuels, which has led to researches at the use of renewable energy sources and, cons...
Studying of polyoxadiazole with Si atom in the backbone
UV-Vis spectroscopy AFM microscopy IR spectroscopy Spin-coating method Organic polymer
2010/4/2
An application of organic polymers as thin films in optoelectronic devices is wide enough. The most common in this area are semiconducting polymers as polyparaphenylenevinylene (PPV) [1] and polyparap...
Electrical properties of polymeric gradient materials based on epoxy resin filled with hard coal
Electrical properties polymeric gradient materials epoxy resin hard coal
2010/1/11
Functionally Gradient Materials (FGMs) are not a quite new group of materials because these materials were known since many years and for the first time they were described in scientific
literature i...
Performance properties and structure of electrochemically aged polypropylene with a dye addition
Engineering polymers Mechanical properties Thermal properties
2010/1/1
Properties of polymeric materials depend on structural factors of polymer as well as on conditions of exploitation. The structural factors are for example: molecular weight, chemical structure of macr...
Preparation and characterization of highly electrically and thermally conductive polymeric nanocomposites
Nanocomposite EVA Graphite Thermal conductivity
2009/12/2
Polymer based nanocomposites are used more and more in the industry due to the fact that dispersing only small quantities of nanoscopic clay particles in polymer matrices enhances significantly therma...
对铬铁精矿球团烧结新工艺以及球团烧结矿冶金性能和固结机理进行研究。研究结果表明:铬铁精矿粒度粗,成球差,必须经过球磨机细磨,使其比表面积达到1 700 cm2/g,才具有良好的成球性;在膨润土配比为1.5%(质量分数)、造球水分为9.0%(质量分数)、造球时间为12 min的条件下,生球落下强度5次/(0.5 m),抗压强度11 N/个,爆裂温度480 ℃。优化的球团烧结工艺参数为:焦粉用量7%(...
C/C+HA骨植入材料对杂交波尔山羊生理生化机能的影响
C/C+HA复合材料 山羊 生理指标
2009/10/21
碳/碳复合材料+羟基磷灰石涂层(C/C+HA)骨植入材料具有与人体骨组织十分接近的弹性模量和优良的表面生物活性,是一种具有重要临床应用价值的骨替换材料.采用杂交波尔山羊作为动物实验模型,开展了C/C+HA复合材料骨内植入实验,并从呼吸、心跳、消化、血液和免疫等方面考察了该植入材料对实验动物生理、生化指标的影响,进而探讨了该材料的生物安全性.结果表明:在植入手术后61?d的观察期内,虽然实验动物出现...
添加载银纳米TiO2对硅橡胶抗菌性能及生物相容性的影响
纳米 二氧化钛 硅橡胶 生物相容性
2009/9/6
研究添加载银纳米TiO2对硅橡胶的抗菌性能及生物相容性的影响。将载银纳米TiO2粉末按不同质量分数0~2.5%添加至硅橡胶,在140 ℃高温硫化1.5 h制成样品;采用浸渍培养法检测样品的抗菌性能;采用MTT法检测样品的细胞毒性,并采用体外细胞培养实验检测样品对细胞黏附的影响,实验细胞为小鼠成纤维细胞(Rat fibroblast cells, L929)。研究结果表明,在TiO2粉末含量为0~2...
Surface Roughness of CoCr and ZrO2 Femoral Heads with Metal Transfer: A Retrieval and Wear Simulator Study
Surface Roughness CoCr ZrO2 Femoral Heads Metal Transfer Wear Simulator
2009/9/2
Metal transfer to femoral heads may result from impingement against the metallic acetabular shell following subluxation/dislocation, or when metallic debris enters the articulation zone. Such transfer...
以介晶二醇4, 4′-二(β-羟乙氧基)联苯(简称DHBP)为原料,通过引入介晶二醇(DHBP)改善基体性能,采用原位聚合聚氨酯的方法,得到综合性能良好的聚氨酯增韧改性的环氧树脂均相体系复合材料。实验结果表明:在DHBP含量为环氧树脂E51的6%,与TDI摩尔比为1׃2,DDM用量为35%,反应时间为2.5 h的条件下,所制备材料的冲击强度提高了187.9%,弯曲强度提高4.7%,拉伸...
硬脂酸/钛酸四丁酯复合改性剂处理掺锑二氧化锡纳米粉体
表面改性 掺锑二氧化锡 纳米粉体 疏水
2009/8/26
用硬脂酸/钛酸四丁酯复合改性剂对掺锑二氧化锡(ATO)纳米粉体进行表面有机化改性处理。通过润湿性、分散稳定性测试研究处理温度、分散介质以及钛酸四丁酯与硬脂酸的量比对改性效果的影响。采用热重分析、透射电镜分析、红外光谱分析、X射线光电子能谱等测试方法对改性后粉体的表面包覆率、形貌、分散状态以及改性机理进行研究。研究结果表明,提高处理温度、适当增加复合改性剂中硬脂酸的量并选用极性弱的有机溶剂可达到比较...
低密度三羟甲基丙烷三丙烯酸酯泡沫的研制
Z箍缩 TMPTA 低密度
2009/8/24
以三羟甲基丙烷三丙烯酸酯(TMPTA)为原料,结合紫外光固化及冷冻干燥工艺,成功制备了密度在4~20 mg/cm3、可自支撑的TMPTA泡沫柱。试验研究发现,泡沫的收缩导致实际密度与理论密度的比值大于1,且随理论密度的增加而减小;热失重测试表明泡沫的热分解温度达到290 ℃;SEM测量表明泡沫具有均匀、开放的网络结构。压汞仪测试表明泡沫的孔径主要分布在3.0~7.5 mm之间,平均孔径为7.37 ...
FEDs用荧光粉亮度和效率研究
FED 发光亮度 发光效率
2009/5/13
对目前国内外FED荧光粉的研究现状进行了综合的描述,特别对涉及的关键问题给予评论,介绍了两种新的荧光粉的主要指标。