Effects of carbonyl-group geometrical parameters on carboxylic-acid dissociation constants in aqueous solution

CNDO/2 has provided a correlation giving the carboxylic-acid ionization constants in aqueous solution on the basis of known OCO bond angles in the carboxyl groups. It is shown that the equation can be used to determine which carboxyl groups in a polycarboxylic acid ionize first.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 24, No. 3, pp. 318–324, May–June, 1988.     

A Sharpening of the Taikov Lower Bound in the Inequality between the C- and L-Norms for Trigonometric Polynomials

Mathematical Notes -     

An Extremum Problem for Periodic Functions with Small Support

Mathematical Notes -     

Kinetics of reverse osmosis desalination of aqueous sodium sulfanilate

Kinetics of reverse osmosis desalination of aqueous sodium sulfanilate is studied on a laboratory pressure filter unit, in relation to the solution concentration, temperature, and pressure in the intermembrane channel.     

Scattering of higher harmonics by a statistical system of nonlinear scatterers

Radiophysical Research Institute, Nizhny Novgorod. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 38, No. 7, pp. 743–747, July, 1995.     

An extremal problem for even positive definite entire functions of exponential type

We consider an extremal problem for even positive definite entire functions of exponential type with zero mean with power weight on the semiaxis. This problem is related to the multidimensional Jackson-Stechkin theorem in the space L ₂(?ⁿ).     

Amplification of two-mode squeezed light in the Einstein-Podolsky-Rosen State

Two schemes for amplifying two-mode squeezed light in the Einstein-Podolsky-Rosen state, where quantum correlations are conserved due to the presence of integrals of motion, while the power of each wave can increase, are considered. The first scheme is based on the parametric three-photon interaction in a transparent nonlinear medium. The second scheme is a variant of the resonance interaction with an atomic ensemble.     

Exponential temperature change in thermal analysis at non-isothermal kinetics

The applying of exponential temperature programming: dT/dt=T orT=T ₀ e ^t in thermal analysis at non-isothermal kinetics is discussed. An approach for the integration of the temperature integral is presented.     

The problem of identifying an adequate kinetic equation for a chemical transformation in thermal analysis

Additional criteria are suggested for the selection of an adequate functiong() describing the mechanism of a chemical transformation using the Satava method.

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Zusammenfassung Zusätzliche Kriterien werden zur Auswahl der geeigneten Funktion g() zur Beschreibung des Mechanismus der chemischen Umwandlung mit der Satava-Methode vorgeschlagen.

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g() .

     

Some supplementary data on particular features of the thermal behaviour of potassium persulfate

The effects of preliminary mechanical activation and thermal treatment of potassium persulfate on the thermal and electrical characteristics of its thermal decomposition were studied by DTA, TG, evolved gas volumetry and high-frequency thermal analysis.

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Zusammenfassung Die Wirkungen von einer vorausgehenden mechanischen Aktivierung und der thermischen Behandlung von Kaliumpersulfat auf die thermischen und elektrischen Charakteristika der Zersetzung dieser Verbindung wurde mittels DTA, TG, volumetrische Messung des freigesetzten Gases und thermische Hochfrequenz-Analyse untersucht.

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, , .