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《中国石油和化工标准与质量》2015,(23)
成品油油库立式金属罐罐容检定主要参数是立式金属罐圈板直径的测量,圈板直径的测量方法有多种,有围尺法、光学垂准线法和全站仪法。全站仪法测量立式金属罐有两种方法,即内测法和外测法。本文主要论述这两种方法的原理与测量的基本过程,在同一立式金属罐,以两种测量法得到的半径与容量实验数据进行比对,从而来说明全站仪测量立式金属罐方法重复性较好,且实验数据精度达到规程的要求。 相似文献
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用全站仪对球形金属罐进行多点测量的方法,既可以提高测量效率,又能够提高测量准确度,此方法值得推广。 相似文献
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介绍一种用光纤测量大量粒子直径的分布的方法。通过在光纤探头内的若干根光纤传输光束直接发射到被测粒子上,由设置在光纤探头内的接收装置把接收到的粒子遮挡光信号传送到光电元件;经处理,由计算机采集,然后计算出粒子运动速度、方向、直径及分布。它能精确、快速地测量大于20μm 液滴或球形粒子运动速度、方向、直径及分布。 相似文献
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介绍非接触式激光钢丝圈内直径测量仪的构成、工作原理和测量过程。该测量仪包括圆形激光三角测量传感器、定位传感器的机械部件以及电控部分,激光发射器可360°发射激光,每次测量可得到径向360°的内部几何特征轮廓线;通过采集特征点数据、配合软件算法可直接测量出轮胎钢丝圈内直径及其平均值、最大值、最小值、极差值和椭圆度等;电控部分可高效稳定地控制机械部件的动作时序及定位,并将检测结果通过人机交互界面传输给终端,实现了柔性、动态、非接触、高精度地检测,可在不破坏钢丝圈结构的情况下一次性精确测量钢丝圈内直径和椭圆度。 相似文献
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依据JJF1384-2012校准规范,使用闪点标准物质测定克利夫兰开口杯法闪点仪闪点示值误差,在此基础上对其示值误差测量结果不确定度进行了评估,分析了各项不确定度分量的来源,评定了合成标准不确定度和扩展不确定度,并对仪器测量范围内校准测量能力(CMC)表示方法进行了初步探讨。 相似文献
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介绍科里奥利质量流量计的基本结构、数学模型和工作原理。定量分析了零点不稳定度对流量总不确定度的影响,最后讨论了减小测量误差、提高测量准确度的方法。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献