共查询到18条相似文献,搜索用时 109 毫秒
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采用新的数学模型研究二元颗粒混合物的取样误差,首次提出了取样的逻辑质量单元的理论,探讨了逻辑质量单元的物理意义,建立了按质量取样的标准偏差的计算公式.应用颗粒药品二元混合物的取样实验,证实了该公式的正确性. 相似文献
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比例方程法测定重稀土二元混合物 总被引:1,自引:0,他引:1
比例方程法是速差动力学分析中常用的方法,Яцимирский和Степаиов[1,2]曾用此法测定稀土混合物。此法的缺点是需要准确控制时间,手工操作时误差较大。 相似文献
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本文对三个Lennard-Jonese二元混合物进行了逐级取样模拟, 获得各体系的超额Helmholtz自由能, 超额内能及超额压力等性质, 所得结果与Nakanishi通过伞形取样法的结果一致, 表明本文方法能够有效地对混合物各类超额性质进行研究。 相似文献
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基于多项分布理论,建立了组合取样方差与取样总体中各子区的大小及其组分含量之间的关系和计算公式,探讨了组合取样常数的物理意义.以颗粒物质为例,探讨了组合取样的逻辑质量单元的概念及其意义,为确定组合取样中的份样质量提供了理论依据.本文对于完善组合取样误差理论,保证组合取样的质量均具有重要意义. 相似文献
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溶液的过剩热容是热力学的重要函数,对其测定与研究具有理论与实际意义.过剩热容不仅可检验溶液中分子间的相互作用,并可利用其计算混合物的热容.本文报告了用微量热仪对环乙烷一本等七个二元物系全浓度范围内在29815K、常压下过剩热容CEp进行的测定工作,上述体系是由具有 相似文献
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甲醇-水二元混合物中Co(bpb)与叠氮离子反应的动力学研究 总被引:1,自引:0,他引:1
Co(bpb) [bpbH2 is N,N'-o-phenylenebis(pyridine-2-carboxamide), C18H12N4O2] complex has active axial sites like a porphyrin complex. We studied the coordination of azide ion (N-3) to Co(bpb) in binary methanol-water mixtures by spectrophotometric method at the temperature range of 283-303 K. From the temperature dependence of the rate constant, activation parameters (Ea, △H#, △S#, and △G#) were obtained. An isokinetic temperature at about 302 K was observed at which the formation rate of Co(bpb)-N-3 was more or less independent of the solvent composition. The resulting △H against T△S plot showed a good linear correlation, indicating the existence of enthalpy-entropy compensation in azide complexation process. Under optimum conditions and based on the absorbance of Co(bpb)-N-3 produced through complex formation, a spectrophotometric method for the determination of N-3 in solution was developed.Alinear relationship between the absorbance and N-3 concentration was obtained in the range of (0.85-5.00)×10-4 mol·L-1 (3.6-21.0 μg·mL-1). The detection limit was 2.5×10-5 mol·L-1 (1.0 μg·mL-1). The proposed method was applied to the determination of N-3 anion in real water samples. 相似文献
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二元互溶系统的气液临界曲线 总被引:1,自引:0,他引:1
分析和报道了二元混合物的气-液临界曲线的几种基本类型。运用从硬球模型得出的适用于高温高压的状态方程,计算了3个不同极性对的系统的临界曲线,在计算中,对于每一个系统只有3个可调节参数,计算结果与实验值相当一致。 相似文献
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Zoya Spolnik László Bencs Anna Worobiec Velichka Kontozova René Van Grieken 《Mikrochimica acta》2005,149(1-2):79-85
This paper presents a systematic micro-analytical study for the assessment of the influence of a typical hot-air blow-in heating system on the generation, transport and deposition of suspended particulate matter (SPM) in the church of Rocca Pietore (Italian Alps). This kind of heating system is very popular in cold regions due to its fast response and economic properties. The size, chemical composition and abundance of individual particles responsible for the negative impact on the displayed artworks are determined by ultra-thin window EPMA. EDXRF is used to determine the bulk chemical composition of SPM. Some gaseous pollutants (SO2, NO2 and O3) are sampled with the application of passive diffusion tubes and quantified with ion-chromatography and spectrophotometry. It is pointed out that several deterioration processes, such as the abrasion of the plastered walls, the re-suspension of the particulate pollution and the generation of NO2 gas, arise mainly from using the heating system. Each of these observations is a concern for the preservation of the displayed works of art. 相似文献
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《Analytical letters》2012,45(7):783-801
Abstract A means of separating gaseous sulfuric acid from flue gas particles has been evaluated. Previous attempts to achieve this separation by filtration resulted in retention of the acid by the particulate buildup on the filter surface. By conducting a laboratory study of a prototype electrostatic precipitator, followed by actual flue gas sampling, it was found that the precipitator may eliminate the need for a filter without affecting the measurement results. It was also found that the precipitator could be used prior to a prototype acid monitor for the successful continual monitoring of H2S04 in combustion gases. 相似文献
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应用MonteCarlo模拟法研究了分层性物质的组合取样精度,探讨了组合样中组分含量的分布规律、组合取样方差的分布规律、组合取样方差估计值的精度与组合样本数目之间的关系等.考察了组分含量服从正态分布、均匀随机分布及多项分布的分层性总体.结果表明,当样本数目较多时,组合取样误差规律对于不同原始分布的总体是相似的. 相似文献
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稳键方差法探讨土壤取样 总被引:5,自引:1,他引:4
用稳键方差法探讨了土壤的一些分析数据的处理,稳键方差分析的优点在于可以降低异常值在统计评价中的影响,易于辨认异常值。本文自理了pH,有机质,阳离子交换量,交换性Mn,易还原态Mn等土壤分析数据,结果显示分析精度足够高而取样精度不够。 相似文献