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The HPHT experiments using the solvothermally prepared g-[C.sub.3][N.sub.4] failed to synthesize any dense carbon nitride phases but instead resulted in the formation of a hydrogen-bearing, carbon nitride imide ([C.sub.2][N.sub.2](NH))-related phase .
This study attempts to characterize the natural diamonds treated by different process (irradiation, HPHT, and multiprocess) using spectroscopic methods, to present the coloration mechanism of them during treatment, and to provide more data of the identification and the treatment method for the gemologists and the jewelry market.
Tom Moses, executive vice-president and chief research and laboratory officer at the Gemological Institute of America, said that although diamond factories had been able to create gem-quality stones since the 1970s, the processes became commercially viable with US chemical vapour deposition (CVD) factories around 2000, and particularly high-pressure, high-temperature (HPHT) factories, principally in China, around five years ago.
Oil and gas electrical connector specialist Rampart Products has specified VICTREX HT polymer for a new HPHT (high pressure-high temperature) KTK (Kintec *) electrical connector for the efficient and safe transmission of power and data during the drilling process.
Very few studies have buttressed the effect of high pressure high temperature (HPHT) conditions on NFs used for EOR.
DICHTOMATIK, an approved supplier for the DuPont range of high performance O-ring seals and gaskets, reports it has extended its stock range of sealing components, including specifically designed items for the high pressure / high temperature (HPHT) conditions as encountered in the demanding oil and gas production and development environments.
The group's North American business, PDL Solutions (North America) LLC, has been tasked with supporting a major Houston-based oilfield services company with the qualification of a High Pressure High Temperature (HPHT) gate valve to the new API 17TR8 design guidelines.
HPHT synthesis and crystalline quality of large high-quality (001) and (111) diamond crystals.
In recent years, CIGMAT researchers have developed unique testing facilities that include high pressure and high temperature (HPHT) testing of materials for oil and gas infrastructure applications.
Topsides at the Maersk Oil-operated high pressure, high temperature (HPHT) Culzean field in the UK Central North Sea.
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