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For example, 同志 (tóngzhì - comrade, a commonly used honorific under Communism) now has a second meaning of "gay person" (because it literally means "same aspirations"—in this case sexual proclivities rather than political interests), and the female equivalent 小姐 (xiǎojiě, often used with service personnel such as waitresses) can also refer to a prostitute. The letters "xx" stand for someone or something, lit. "How much longer are you planning to go on like this?

Chronometric dating relative dating

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SYNONYMS OR RELATED TERMS: amino-acid dating; aminostratigraphy; amino-acid racemization, amino acid racemization CATEGORY: technique DEFINITION: A method of absolute (chronometric) dating which is hoped to fill the gap between radiocarbon dates and potassium-argon dates.

The term refers to the fact that an approximate date can be inferred by comparison with something else of known age.Aspartic acid is the compound most often used because it has a of 15,000-20,000 years and allows dates from 5,000-100,000 years to be calculated.However, racemization is very much affected by environmental factors such as temperature change.The scholar most associated with the rules of stratigraphy (or law of superposition) is probably the geologist Charles Lyell.The basis for stratigraphy seems quite intuitive today, but its applications were no less than earth-shattering to archaeological theory.Excavation: Archeologists excavate buried cultural remains to both gather information about past human behavior and to preserve and protect cultural resources from destruction, either from human or natural processes. Discussed below are the three major types of dating used in archeology – relative dating, chronometric dating, and absolute dating – and some of the more popular methods employed in each general category.Archeological excavations, or “digs,” are conducted using very specific methods and rigorous vertical and horizontal spatial controls. Relative dating in archeology determines the age of cultural material in relation to other cultural material, but does not produce precise dates.Given the current status of direct chronometric dating methods for Arabian petroglyphs, it is rare that the precise age of a rock art panel can be determined.However, all is not lost, and it is possible to establish a temporal sequence that can be quite edifying.Different researchers have applied a variety of absolute dating methods directly to petroglyphs or to sediments covering them, including AMS (accelerator mass spectrometry) radiocarbon, cation ratio, amino acid racemization, OSL (optically stimulated luminescence), lichenometry, micro-erosion and micro-stratification analysis of patina. These techniques have yielded mixed results in terms of reliability and feasibility, but, in any case, none has been applied to date in Saudi Arabia.It is hoped that absolute dating will be successfully implemented in the future in this region.