نتایج جستجو برای: reference materials
تعداد نتایج: 693890 فیلتر نتایج به سال:
To meet high expectations concerning precision and accuracy of reference materials, preparation of matrix-free reference materials using thermal decomposition-gas chromatography-mass spectrometry (TD-GC-MS) was proposed in this study. In the paper, the results obtained in preparation of the new reference materials for benzene and toluene are presented, based on the thermal decomposition techniq...
having conducted the experiment and analysed the data, the researcher computed the groups mean scores and variances for the test relating to the research question. as the final atep, a t-test was conodonted for the hypothesis. as noted earlier, the significance level was determined at .05 and .01 respectively. the observed t-value was higher than the critical t-value at. 5 and .01 levels. conse...
a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...
The standardization of measurements is a high-priority in Laboratory Medicine; its purpose being to achieve closer comparability of results for the same analyte obtained using different commercial systems (1). The promotion of result traceability to available higher-order reference measurement procedures and reference materials is the recommended approach (2). A major prerequisite for guarantee...
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