共查询到19条相似文献,搜索用时 93 毫秒
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从国外的实际经验和木材与聚氨酯胶粘剂粘接机理出发,介绍了高速动车组地板支撑粘接用胶的选型思路和技术要求。 相似文献
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我厂是一个综合性的钢铁企业.由于领导的重视,使我厂从上到下建立了一支较完善的粘接技术队伍.在重庆市科委情报处粘接技术交流队伍和重钢公司增节办粘接组的热情帮助下,以多种形式地开展粘接技术培训和普及应用粘接技术工作.目前全厂有十 相似文献
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选择两种国产水性胶(Ⅰ型和Ⅱ型)以及一种双组分聚氨酯胶粘剂,将地板布粘接到不同材质的地板上,即铝合金和木质地板,测试粘接剥离强度,对比分析了在不同地板基材上的粘接破坏形式。研究结果表明:Ⅰ型胶粘剂在铝合金和木地板上的剥离强度分别为1.182和1.731 N/mm,不但具有一定的粘接强度,还能满足动车组地板布拆除的要求,且适用于动车组导槽处地板布的粘接。而水性Ⅱ型胶在铝合金和木地板基材上的剥离强度值分别为0.355和1.172 N/mm,不适合作为动车地板布粘接胶。国产双组分聚氨酯胶在铝合金、木地板基材上的剥离强度分别为3.089和2.698 N/mm,均有较高的粘接强度,适合用作城轨车地板布胶粘剂。 相似文献
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CRH3型动车组生产初期完全采用西门子技术转让中要求的涂装体系及施工工艺,由于国内施工环境与德国西门子的施工环境相差较大,导致引进的涂装体系出现了严重的水土不服现象。在施工过程中,尤其在温度高、湿度大的夏季,车体涂层经常出现严重的缺陷,不能满足《CRH3型动车组涂层质量评估标准》。由于涂层缺陷导致了大量的返修工作,材料及人工成本明显增加,同时影响到动车组的生产进度,引起公司领导的高度重视。为了解决涂层缺陷问题,技术人员联合涂料制造商在唐车现场进行了大量的涂装工艺试验,确立了适合唐车施工环境的涂装工艺。 相似文献
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叙述化肥非生产环节即移运,包装,储存等过程的质量控制问题,介绍影响化肥物理质量的关键因素临界相对湿度的概念,分析结块,起尘,流动性差及过度吸湿等化肥物性衰减的原因。 相似文献
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介绍一种可用于高速机车轮对中的新型丙烯酸酯泡绵胶带。利用其优异的粘弹性和粘接强度,将金属板牢固地粘贴于轮对内侧,可以起到良好的降噪减震效果。 相似文献
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在电镀过程中影响镀层质量的因素很多,生产过程中不可避免地要出现一些质量上的问题,其中镀层与基体的结合强度就是衡量质量的重要指标之一.通过对镀层与基体结合机理及其影响因素的探讨,提出了提高镀层与基体结合强度的途径,为改善镀层的结合力提供了参考依据. 相似文献
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Mika Yamanaka-Takaichi Yukari Mizukami Koji Sugawara Kishiko Sunami Yuichi Teranishi Yukimi Kira Ralf Paus Daisuke Tsuruta 《International journal of molecular sciences》2021,22(5)
Psychological stress exacerbates mast cell (MC)-dependent inflammation, including nasal allergy, but the underlying mechanisms are not thoroughly understood. Because the key stress-mediating neurohormone, corticotropin-releasing hormone (CRH), induces human skin MC degranulation, we hypothesized that CRH may be a key player in stress-aggravated nasal allergy. In the current study, we probed this hypothesis in human nasal mucosa MCs (hM-MCs) in situ using nasal polyp organ culture and tested whether CRH is required for murine M-MC activation by perceived stress in vivo. CRH stimulation significantly increased the number of hM-MCs, stimulated both their degranulation and proliferation ex vivo, and increased stem cell factor (SCF) expression in human nasal mucosa epithelium. CRH also sensitized hM-MCs to further CRH stimulation and promoted a pro-inflammatory hM-MC phenotype. The CRH-induced increase in hM-MCs was mitigated by co-administration of CRH receptor type 1 (CRH-R1)-specific antagonist antalarmin, CRH-R1 small interfering RNA (siRNA), or SCF-neutralizing antibody. In vivo, restraint stress significantly increased the number and degranulation of murine M-MCs compared with sham-stressed mice. This effect was mitigated by intranasal antalarmin. Our data suggest that CRH is a major activator of hM-MC in nasal mucosa, in part via promoting SCF production, and that CRH-R1 antagonists such as antalarmin are promising candidate therapeutics for nasal mucosa neuroinflammation induced by perceived stress. 相似文献
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航空工业结构粘接质量控制 总被引:4,自引:0,他引:4
以金属结构粘接质量控制标准HB5339-1995为依据,重点介绍航空结构粘接质量控制的意义,以及对人员、设备、胶粘剂、文件资料、施工环境、粘接工艺、质量控制等基本要求和若干事例。 相似文献
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Math H. G. Jennekens 《Nutrient Cycling in Agroecosystems》1987,12(2):175-184
Fertilizer salts are sensitive to the humidity of the surrounding air; above certain relative humidities, they will absorb water. The humidity above which they absorb water is defined as critical relative humidity (CRH). The CRH decreases with increasing temperature.Fertilizer drying usually takes place at relatively high temperatures to facilitate heat exchange. The optimum drying effect is obtained only when the CRH of the product is sufficiently greater than the actual relative humidity (RH) of the air. A method that takes into account both the heat exchange and the CRH of the material has been developed for designing rotary dryers for fertilizers. A computer program is available that supports this design procedure. 相似文献