共查询到18条相似文献,搜索用时 437 毫秒
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火焰原子吸收光谱法测定中药防风中铜、锰、锌和铁的不确定度评定 总被引:1,自引:0,他引:1
采用HNO3和HClO4消解防风样品,利用火焰原子吸收光谱法测定其中铜、锰、锌和铁含量.对测量过程中不确定度的产生原因进行了分析,并对防风中4种元素含量测定结果的不确定度进行了评定. 相似文献
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英平诸痹灵药酒中铜、锰、镍、钴、锶、锂的含量及分析 总被引:3,自引:0,他引:3
利用火焰原子吸收法测定5种英平诸痹灵药酒中铜、锰、镍、钴、锶、锂的含量。结果表明,该类药酒中锰含量较丰富,锂含量较低,其含量由多到少的顺序为:锰>锶>镍>铜>钴>锂。探讨了英平诸痹灵药酒中微量元素与治疗类风湿疾病的关系。 相似文献
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本文以5-Br-PADAP-OP为显色体系,用计算导数分光光度法同时测定了铜、锌、锰三组分;比较了不同计算方法,测量波长点的数目及测量波长点在同阶或异阶导数光谱中选取时对计算结果的影响。本方法用于铸铝标样中铜、锌、锰的同时测定,获得较满意的分析结果。 相似文献
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本文通过激光加工结合电化学腐蚀脱合金法, 成功实现了纳米多孔涂层的制备. 采用激光熔覆首先在45钢表面制备了成形良好、稀释率低的铜锰合金熔覆层, 并通过快速重熔工艺实现了初始材料组织细化. 研究表明, 在不同的电解液下,铜锰合金的临界腐蚀电位出现了明显的偏移; 在不同的腐蚀电流下,铜锰合金腐蚀后的形貌迥异. 最终,通过选择性腐蚀成功实现了纳米多孔铜和纳米多孔锰涂层的制备, 并利用电位-pH图对脱合金的选择性腐蚀进行了详细的理论解释. 相似文献
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压强是工业生产过程中的一个重要参数,其准确测量是过程控制的关键。气体分子光谱线型和线宽取决于分子间相互作用和温度、气压等因素,利用窄线宽气体吸收光谱的压力展宽效应,可通过高分辨地测量气体吸收谱线得到压强信息,实现压力计校准。提出了一种基于光腔衰荡光谱技术和气体吸收谱线压力展宽效应的压力计校准方法。采用5.2 μm可调谐量子级联激光器,基于连续光腔衰荡光谱技术建立了压力计校准实验装置。室温下,测量水汽在1 877 cm-1附近的一吸收谱线,线宽为0.084 21 cm-1,重复性测量误差小于1.53×10-4 cm-1,对应的压强大小为98.12 kPa,检测灵敏度优于0.18 kPa,与高精度压力计读数98.14 kPa一致。利用测试谱线线宽与压强的关系得到压力展宽系数(0.087 12±0.000 965) cm-1·atm-1,与HITARN数据库参考值0.087 1 cm-1·atm-1一致。实验校准了一小量程压力计。结果表明基于光腔衰荡光谱的高分辨吸收谱线测量在压强检测和压力计校准领域具有很好的应用前景。 相似文献
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This paper describes the characterization of the newly developed piston gauge pressure standard at the National Physical Laboratory
(NPL), with particular reference to its fall rate, engagement length of the piston and the deceleration rate for the measurement
of hydraulic hydrostatic pressure up to 60 MPa. The low pressure effective area of the gauge derived from its dimensional
measurements when compared with the value obtained by its direct calibration against NPL transfer pressure standard agrees
within 0.025%. The pressure gauge is quite stable, reproducible and has a sensitivity of 3 ppm. Though the theoretically calculated
value of the pressure coefficient is low as compared to the experimentally observed one in its absolute terms, the pressure
dependent effective area agrees within ± 0.025% over whole of the pressure range which is well within the uncertainty statement
of the two independent techniques used. 相似文献
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石英拉曼峰进行压力标定的误差研究 总被引:2,自引:0,他引:2
在常温常压下进行了作为压标的石英颗粒的拉曼光谱测量和研究。研究结果发现,在25℃和常压条件下,不同的石英颗粒测得的Si—O振动模在463.59~464.65cm-1范围内变化,误差为(±0.1~±0.3)cm-1。其中不同石英颗粒拉曼峰的最大差异达1.06cm-1,远远大于其测量误差。我们认为这是由于石英破碎时使石英颗粒内产生的应力所致。因此,在进行金刚石压腔高温高压实验的压力确定时,必须以常压下实测的Si—O振动模测量值为零压参考点。另外,拉曼光谱仪的波数漂移以及环境温度的不稳定均会造成不可忽视的压力测量误差,应对此进行校正。 相似文献
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An impedance gauge based on measurement of strains at two different cross-sections of a conical gauge rod is tested. The gauge rod is in contact with the object at its narrow end while its wide end is driven by a harmonic vibrator. The length of the gauge rod is 260 mm and its end diameters are 9·8 mm and 20·1 mm. For cylindrical test objects a fair agreement is generally obtained between experimental and theoretical point impedances in the frequency range 50 Hz to 5 kHz. Further improvements in accuracy are expected to be feasible. 相似文献
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Pressure measurements during speech production using semiconductor miniature pressure transducers: impact on models for speech production 总被引:1,自引:0,他引:1
It appears that temperature instabilities are a major obstacle hindering the use of semiconductor strain gauge pressure transducers in speech research, especially when absolute pressure data are mandatory. In this paper a simple and reliable method for an in vivo calibration of this kind of transducer is described. The most important error source, the drift of the zero pressure level due to temperature changes, is discussed, and an estimation of the measurement accuracy which can be obtained is given. Moreover, some registrations of subglottal, supraglottal, and transglottal pressure are presented. It is shown that the pressure recordings allow us to obtain estimates of the volume flow in the trachea and pharynx. Analysis of those waveforms appears to lead to new insights into the physical processes underlying voice production. Specifically, an independent glottal contribution to the skewing of the glottal flow pulses is identified. 相似文献
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介绍利用激光干涉与数字图像处理技术以及应用FFT分析干涉涤纹方法,分析并解决测量端面长度标准中条纹图的处理技术。应用这种方法不但提高了测试过程的自动化程度,而且大大地提高了测量精度。文中给出了最典型的端面长度标准量块的干涉条纹小数部分的实测结果。 相似文献