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造成橡胶直角形撕裂强度测试结果偏差的原因分析 总被引:1,自引:0,他引:1
采用不同裁刀裁切3种胶料试样,并由不同操作人员测试其直角形撕裂强度。根据试验结果分析了造成直角形撕裂强度测试结果差异的主要原因:不同试验人员因测试习惯不同会造成测试结果的差异;裁刀顶角的曲率半径不同也会造成测试结果不同,使用顶角尖锐裁刀时测试数据偏小,反之测试数据偏大;不同胶料受不同裁刀影响的程度不同,抗撕性能好的受影响较小,抗撕性能差的受影响较大。 相似文献
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水泥中所用石膏种类与其溶解速度的关系 总被引:10,自引:1,他引:10
本文根据不同种类石膏溶解速度不同的特点,提出不同品种水泥应采用不同种类石膏,并进行了分析和讨论。从而较圆满地解释了不同品种水泥需采用不同种类石膏的原因,为以后研制新品种水泥时合理地选择石膏提供了依据。 相似文献
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良友 《精细化工原料及中间体》2008,(4)
一、柔软整理中常见质量问题
1、达不到应有手感 柔软整理的柔软风格随客户要求不同而不同.如柔软、平滑、蓬松、柔糯、油滑、干滑等.根据不同的风格选用不同的柔软剂。如软片中.有不同结构的柔软剂软片。其柔软度、蓬松度、滑度、泛黄情况、影响织物吸水性等均不同;在硅油中,不同改性基因的改性硅油性能也不同,如氨基硅油、羟基硅油,环氧改性硅油、羧基改性硅油等性能均不同。 相似文献
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在连续流动固定床加氢装置上,考察Co-Mo型催化剂和Ni-W型催化剂在不同操作条件以及不同脱硫深度下的加氢脱硫反应性能。结果表明,两种催化剂对操作压力改变的敏感度不同;在不同的脱硫深度下,对不同的原料油也表现出不同的脱硫活性。 相似文献
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酸化工艺技术是油田开发常用的一种提高产量的有效措施,而不同的因素对酸化效果的影响也不尽相同,不同区块的有着不同的地质条件,最适合的酸化类型也不同。本文简介了通过模糊数学法选出不用因素的影响强度,举例说明了不同区块的根据不同的地质条件选用不同的酸化措施类型。 相似文献
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不同区域污水处理厂活性污泥中微生物菌落结构分析 总被引:1,自引:0,他引:1
结合纯种分离纯化和变性梯度凝胶电泳法(DGGE)分析了中国不同区域污水处理厂的曝气池中活性污泥的微生物群落结构及差异性。其中,可培养微生物经纯化后对16s rDNA片段进行PCR扩增并测序,在Blast中分析后构建系统发育树。分离培养得到的89种细菌大部分属于β-变形菌门(Bataproteobacteria)、γ-变形菌门(Gamaproteobacteria)和厚壁菌门(Firmicutes)。DGGE分析表明所有活性污泥样品中的菌种丰富度都很高,不同的样品中存在很多相同的条带,是属于所有活性污泥中共有的优势菌群,说明不同的活性污泥系统具有高度的生物相似性;每个地区的样品中也都含有自己的特异条带。并且同一地区活性污泥的相似性大于不同地区活性污泥的相似性,主要与各地区不同的自然经济环境和人们的生活习惯相关。 相似文献
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收集了两种常见型号(A型、B型)的39架国内在役宽体客机近10年的腐蚀损伤数据,明确了在役宽体客机结构中易腐蚀的区域。分析了机龄和环境因素对腐蚀的影响,不同区域的腐蚀频率差异,以及结构用材的差异对腐蚀发生频率的影响。结果表明,宽体客机结构腐蚀频率随定检周期的进行具有周期性变化。处于不同机场环境区域的宽体客机在结构腐蚀频率上有显著的差异。厨卫结构和货舱区域由于其专门的使用功能而发生了较为频繁的腐蚀。A型宽体客机在客舱座椅与地板区域由于采用了铝合金与碳纤维复合材料混用的情况,因而发生腐蚀的频率明显高于B型宽体客机。 相似文献
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In a spindle-tree apple orchard, sex pheromone traps for the summerfruit tortrix moth were distributed at different spacings. From the captures, information was derived about influence of prevailing wind direction and of trap spacing on interactions between traps. Prevailing wind direction in the experimental area had no appreciable influence on trap interaction, perhaps because of eddying within the planting. The relationship between density and capture of traps was first considered theoretically and interaction by overlap of active-space areas was distinguished from that by overlap of mere capturing areas, which depend also on distance of dispersal. The actual results were in accordance with these considerations and indicated that the diameter of the active-space areas averaged 15 m. The variation in the captures of the wider-spaced traps was too large to be conclusive about the average width of the capturing areas, but the diameter of these seemed to be more than about 45 m. These data have been related to adequate trap distances for monitoring and mass trapping.Lepidoptera: Tortricidae. 相似文献
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In order to find the segments of Pinios River which lack the retention capacity of the BOD and nutrient input, the difference of the estimated input and output pollution loads was compared at upstream and downstream clustered areas of a total of 73 segments. Catchment areas ranged from 1 to 11,300 km2. Emissions were always higher than the actual transport, therefore retention was assumed to take place. Specific runoff, percentage of the surface water area and the calculated input of pollution loads (BOD, P, N) varied between the different Pinios River basin catchment areas. The transport to the emission load ratio was different between large and small catchments. The rate of retention among consecutive segments revealed that four lowland segments lacked in their relative retention capacity. 相似文献
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为研究提升管颗粒循环流率对提升管压降的影响,搭建双循环流化床冷态实验系统,采用差压变送器进行提升管轴向区域压降的实验研究。基于提升管不同的颗粒速度计算方法,充分考虑加速区和充分发展区的不同压降机理,建立加速区、充分发展区和整个提升管压降模型,与实验结果比较发现:加速区颗粒速度采用滑移系数方法所得压降与实验值较吻合,在充分发展区进行压降计算时颗粒速度采用滑移速度等于终端速度计算所得结果较精确;在提升管压降计算时可综合考虑加速区和充分发展区适用的压降模型进行计算,可为实际生产运行中采用压差法进行提升管轴向颗粒浓度的分布提供一定参考,为提升管压降的在线监测提供指导。 相似文献
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The aim of this project was to check reproducibility of results obtained using NOCS (no connection to the substrate) arrangement of the electrochemical noise method (ENM). NOCS involves taking measurements from three nominally identical areas on the coated surface. Thus, no electrical connection to substrate is required. In practice the areas are not identical and various arrangements for connection of the three cells were tried to see if the individual areas could be separated out and whether the individual resistances could be computed. Also different ways of calculating the Rn (noise resistance) and Rsn (spectral noise resistance) parameters were attempted to see which one gave the best comparison with the more standard EIS measurements. The maximum entropy method was recognized to be the most useful for comparison with EIS, as well as for graphic evaluation of results. Regarding distinguishing three areas using different connection arrangements, it was possible to identify the situation when one of the three values was different to the other two. However further experiments are needed before it will be possible to confidently assign an Rn value to each individual area. 相似文献