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Forecast of relationship between a relative humidity and a dew point temperature

Chabane F., Moummi N., Brima A.

Journal of Power Technologies

2018

Vol. 98, nr 2

183--187

Relative humidity is a sensitive parameter in the sciences. It impacts the physical performance of electrical devices, metals, agro-food and biological items to name just a few. There are numerous factors such as dew point temperature, ambient temperature and solar radiation that can combine to influence relative humidity. There have been a handful of studies conducted on forecasting variations in relative humidity in the city of Biskra, Algeria. One typically finds that the dew point temperature is involved in variants of relative humidity, so we have been trying to predict it and create a semi-empirical equation as a function of apparent solar time, influenced by maximum and minimum dew point temperature, rather than create a new correlation related with ambient temperature. This study aims to contribute relative humidity as a function of the dew point temperature and validate it with experimental measurements.

A Theoretical Study on (eta5-C5H5)Fe(CO)(PPh3)(C(O)CHMe) Anion Structure and Stereoselectivity

Anisimov V., Bartnicka E., Dybała-Defratyka A., Paneth P.

Polish Journal of Chemistry

2002

Vol. 76 / nr 5

737-744

Organometallic systems provide an exceptional tool in the stereoselective synthesis. The source of this selectivity, however, frequently remains a challenging question. In recent years, theoretical studies of mechanisms of organometallic and metalloprotein catalysis have received considerable attention. The density functional theory (DFT) methods have been shown to be very successful in these studies. Their application, however, is still limited by the performance of the present computers. As the result, a new class of methods, which employ quantum mechanical calculations combined with either semiempirical and/or molecular mechanics levels (QM/MM), has been developed. This stimulated development of a number of new semiempirical methods, which can handle metals. We present a comparison of a few of these new methods with the DFT level on the example of the acetyliron. In addition, the DFT calculations are used to shed some light on the mechanism of the stereospecific catalysis by acetyliron.