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A certified reference material is a particular form of measurement standard. Reference materials are particularly important for analytical chemistry and clinical analysis. [2] Since most analytical instrumentation is comparative, it requires a sample of known composition (reference material) for accurate calibration.
This wall painting found in the Roman city of Pompeii is an example of a primary source about people in Pompeii in Roman times (portrait of Terentius Neo).. In the study of history as an academic discipline, a primary source (also called an original source) is an artifact, document, diary, manuscript, autobiography, recording, or any other source of information that was created at the time ...
The book about love letters might analyze the letters (which is secondary material) and provide a transcription of the letters in an appendix (which is primary material). The work based on previously published sources is probably a secondary source; the new information is a primary source.
The δ values and absolute isotope ratios of common reference materials are summarized in Table 1 and described in more detail below. Alternative values for the absolute isotopic ratios of reference materials, differing only modestly from those in Table 1, are presented in Table 2.5 of Sharp (2007) [1] (a text freely available online), as well as Table 1 of the 1993 IAEA report on isotopic ...
A primary source in science is one where the authors directly participated in the research. They filled the test tubes, analyzed the data, or designed the particle accelerator, or at least supervised those who did. Many, but not all, journal articles are primary sources—particularly original research articles. An appropriate primary source is ...
Secondary or tertiary sources are needed to establish the topic's notability and avoid novel interpretations of primary sources. All analyses and interpretive or synthetic claims about primary sources must be referenced to a secondary or tertiary source and must not be an original analysis of the primary-source material by Wikipedia editors.
Secondary sources are accounts at least one step removed from an event or body of primary-source material and may include an interpretation, analysis, or synthetic claims about the subject. [2] Secondary sources may draw on primary sources and other secondary sources to create a general overview; or to make analytic or synthetic claims. [3] [4]
These are sources which, usually, are accounts, works, or research that analyze, assimilate, evaluate, interpret, and/or synthesize primary sources. These are not as authoritative and are supplemental documents concerning the subject under consideration. These documents or people summarize other material, usually primary source material.