pre-precipitationadj.n.

Brit.

/ˌpriːprᵻˌsɪpᵻˈteɪʃn/, U.S.

/ˌpriprəˌsɪpəˈteɪʃ(ə)n/

Origin: Formed within English, by derivation. Etymons: pre- prefix, precipitation n.

Etymology: < pre- prefix + precipitation n. Compare postprecipitation n.

A. adj.

attributive. Designating phenomena occurring at or immediately before the onset of precipitation, esp. (Metallurgy) those occurring in solid solution in alloys, as the separation of submicroscopic particles from which crystals later develop. Also: of or relating to precipitation as a preliminary stage in a process.

ΘΚΠ

society > occupation and work > industry > working with specific materials > working with metal > [adjective] > pre-precipitation in alloys

pre-precipitation1936

1936 M. Cohen in Metals Technol. Oct. 15 The resistance and dilation curves indicate knot formation even at 200°, although there is no pre-precipitation hardening at this temperature.

1949 J. E. Garside Process & Physical Metall. xii. 213 This process of age-hardening consists of two stages—(i) Pre-precipitation stage resulting in the formation of nuclei; (ii) Growth of the nuclei.

1965 Hunsicker & Stumpf in C. S. Smith Sorby Centennial Symposium Hist. Metall. xviii. 287 The conviction became widespread that some sort of ‘pre-precipitation’ structure was developed at low temperatures and possibly at higher temperatures prior to and preparatory to actual precipitation.

1978 Proc. National Acad. Sci. U.S.A. 75 2166/1 The preprecipitation step with normal sheep serum was omitted.

1993 Water Res. 27 293 This paper deals with the addition of a preaeration and a preprecipitation stage to a conventional activated sludge process.

2004 Langmuir 20 2282 A ternary phase diagram was established showing three interesting realms of the polymer–surfactant–water mixture: a preprecipitation area of lowered viscosity.., a postprecipitation area.., [etc.].

B. n.

The action or process of precipitation prior to further treatment or processing; esp. the preliminary precipitation of solids in the treatment of sewage effluent.

ΚΠ

1978 Proc. National Acad. Sci. U.S.A. 75 5676/2 Preprecipitation with normal rat serum did not affect the precipitation of the expected..chains by the rabbit anti-AgB antigen serum.

1988 Water Res. 22 151 New developments of precipitation techniques..have been directed towards dual purpose chemical pre-precipitation.

2000 Jrnl. Agric. & Food Chem. 48 2721 Five preparations of porphyran of differing molecular masses and chemical compositions were obtained by preprecipitation with ethanol.

2004 Bio-med. Materials & Engin. 14 5 The pre-precipitation of either calcium or phosphate could prevent the apatite formation on the surface of alkaline treated titanium.

This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022).

单词	pre-precipitation
释义	pre-precipitationadj.n. Brit. /ˌpriːprᵻˌsɪpᵻˈteɪʃn/, U.S. /ˌpriprəˌsɪpəˈteɪʃ(ə)n/ Origin: Formed within English, by derivation. Etymons: pre- prefix, precipitation n. Etymology: < pre- prefix + precipitation n. Compare postprecipitation n. A. adj. attributive. Designating phenomena occurring at or immediately before the onset of precipitation, esp. (Metallurgy) those occurring in solid solution in alloys, as the separation of submicroscopic particles from which crystals later develop. Also: of or relating to precipitation as a preliminary stage in a process. ΘΚΠ society > occupation and work > industry > working with specific materials > working with metal > [adjective] > pre-precipitation in alloys pre-precipitation1936 1936 M. Cohen in Metals Technol. Oct. 15 The resistance and dilation curves indicate knot formation even at 200°, although there is no pre-precipitation hardening at this temperature. 1949 J. E. Garside Process & Physical Metall. xii. 213 This process of age-hardening consists of two stages—(i) Pre-precipitation stage resulting in the formation of nuclei; (ii) Growth of the nuclei. 1965 Hunsicker & Stumpf in C. S. Smith Sorby Centennial Symposium Hist. Metall. xviii. 287 The conviction became widespread that some sort of ‘pre-precipitation’ structure was developed at low temperatures and possibly at higher temperatures prior to and preparatory to actual precipitation. 1978 Proc. National Acad. Sci. U.S.A. 75 2166/1 The preprecipitation step with normal sheep serum was omitted. 1993 Water Res. 27 293 This paper deals with the addition of a preaeration and a preprecipitation stage to a conventional activated sludge process. 2004 Langmuir 20 2282 A ternary phase diagram was established showing three interesting realms of the polymer–surfactant–water mixture: a preprecipitation area of lowered viscosity.., a postprecipitation area.., [etc.]. B. n. The action or process of precipitation prior to further treatment or processing; esp. the preliminary precipitation of solids in the treatment of sewage effluent. ΚΠ 1978 Proc. National Acad. Sci. U.S.A. 75 5676/2 Preprecipitation with normal rat serum did not affect the precipitation of the expected..chains by the rabbit anti-AgB antigen serum. 1988 Water Res. 22 151 New developments of precipitation techniques..have been directed towards dual purpose chemical pre-precipitation. 2000 Jrnl. Agric. & Food Chem. 48 2721 Five preparations of porphyran of differing molecular masses and chemical compositions were obtained by preprecipitation with ethanol. 2004 Bio-med. Materials & Engin. 14 5 The pre-precipitation of either calcium or phosphate could prevent the apatite formation on the surface of alkaline treated titanium. This entry has been updated (OED Third Edition, March 2007; most recently modified version published online March 2022). < adj.n.1936
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