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从人发中提取胱氨酸的比色分析测定方法 总被引:1,自引:0,他引:1
从人发中提取的胱氨酸,需要对其含量进行测定。本文提出了用比色分析测定胱氨酸的含量,此法与国家标准GB1296-77方法进行比较,其变异系数为1.03-1.17%,可以用于胱氨酸生产的控制分析中。 相似文献
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进行了不同方法测定化纤钛白中钛含量的比较实验,发现:采用不同的方法(国标GB1706—93和日本工业标准JISK1409—1994)标定硫酸高铁铵溶液的浓度,标定结果偏差不大(<006%),说明由于标定方法的不同引起的钛含量测定结果的偏差较小(<01%);不同分析人员引起的操作误差较小,一般偏差<01%。 相似文献
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用间接法测定了硝基腐植酸钙中络合钙的含量。该法操作简单,测定结果准确。该法的变异系数为052%,回收率为9997% 相似文献
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建立了简单迅速地利用间接碘量法测定微量H2S含量的方法。该法检测H2S含量准确可靠,测定范围为1~100mg/m3,检测限量可达02mg,重现性良好 相似文献
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本文介绍用热分析仪和X射线光电能谱分析仪对在200±5℃,24.5MPa工作条件下,连续使用22000h(2.5年)后的PPS/GF耐高温隔热垫块的PPS树脂基体进行了剖析。结果表明,PPS的深度热氧化交联只发生在耐高温隔热垫块热端的表层及浅表层。离面层深度1mm的深层,PPS仍具备典型的热塑性特征。此外,对PPS复合构件耐高温特性优化设计提出了新的构思。 相似文献
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运用应力分析、疲劳分析的理论,综合专家学者的知识和经验,针对现代化大型联合企业技术管理的现状,提出了建立在线化工设备及管道安全评定中疲劳分析的专家系统方法,并编制了初级的软件。用简化试验来模拟一条高温高压蒸汽管线的疲劳裂纹扩展,并用之考评本软件。 相似文献
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在基于应力计算软件如国际通用的CAESARⅡ和水利计算软件如PIPENET、AFT等被普遍应用的基础上,介绍对管道进行水(汽)锤分析的一种更为精确合理的方法-时程分析。通过实例,详细介绍时程分析的过程,并与现在普遍应用的响应谱分析方法结果进行比较。 相似文献
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应用ANSYS软件对一大型厚壁(φ356mm×55mm)等径焊接三通在受内压作用下的应力进行了计算和分析,得到该三通模型的应力分布规律,并结合相应的试验数据进行对比,验证了有限元分析结果的可靠性。 相似文献
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聚氨酯中异氰酸酯基测定方法述评 总被引:8,自引:2,他引:6
关于聚氨酯中异氨酸酯基的测定,国内外已进行了大量的研究工作。文中对测定聚氨酯中异氛酸酯基的一些主要方法作简要评述,包括化学分析法、分光光度法、红外光谱法、气相色谱法和高压液相色谱法。 相似文献
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Kerwin Rakness Gilbert Gordon Bruno Langlais Willy Masschelein Nobuo Matsumoto Yves Richard 《臭氧:科学与工程》1996,18(3):209-229
A joint meeting of members of the Quality Assurance Committees of the International Ozone Association Pan American Group (PAG), European-African Group (EAG), and Nippon Islands Group (NIG) was held in Oxford, Ohio on November 8 and 9, 1995. The purpose of the meeting was to establish a single, shared guideline for ozone concentration measurement in the gas phase and, in particular, from commercial ozone generators. 相似文献
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综述了聚乙烯国内外发展概况.国内产需平衡.进出口状况,“九五”发展预测。对1996年聚乙烯市场进行预测并提出改进建议。 相似文献
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This paper presents a new device for the dosage of ozone in the gas phase. This device measures the concentration of ozone according to the isothermal differential pressure procedure. In principle, this procedure achieves a totally physical ozone measurement without requiring calibration using a chemical method. A comparison is made between the physical results and chemical results obtained by the iodometric standard method (IOA, 1987). There is satisfactory agreement between the two series of measurements in the range of ozone concentration where the chemical method is applicable (with a standard error of estimate of 4.4%).The method and the device are perfectly reliable based upon the strict measurements of temperature and pressure and a convenient choice of constitutive materials. 相似文献
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Hydrodynamic properties of bubbling flow through a three-phase fluidized bed with a moderately large diameter have been characterized
with statistical and stochastic analyses of a comprehensive set of experimentally measured pressure fluctuations in the bed.
The analyses have yielded the fluctuations' histogram, mean, maximum, minimum, standard deviation, skewness, kurtosis, and
power-spectral-density function. As the gas flow rate increased with other operating conditions fixed, the mean and standard
deviation increased, the skewness decreased, the distribution of the power-spectral-density function broadened, and the major
frequency increased. In contrast, as the liquid flow rate increased, the mean and standard deviation decreased, the skewness
and kurtosis increased, the powerspectral-density function narrowed, and the major frequency decreased. The hydrodynamic properties
of a three-phase fluidized bed with a moderately large column in terms of pressure fluctuations are strongly affected by the
flow rates of both the fluidizing gas and liquid. 相似文献