Authors:Yu. Bourmistenko, I. Ivanov, V. Sviridova, and Yu. Feoktistov
The possibilities of using a computer to optimize the conditions of gamma-activation analysis are considered. Criteria of
optimum conditions are formulated. The optimization program is constructed of the following operations being automatically
performed: (1) determination of a list of isotopes and their gamma-lines formed during the interaction between the activating
bremsstrahlung and the substance whose elemental composition elements to be analyzed plus matrix is preliminarily given; (2)
optimization of the analysis time regimes and the value of the maximum energy of the activating bremsstrahlung; (3) choice
of a gamma-line of the isotope of an element to be analyzed by which the quantitative determination of this element is expedient.
For these purposes a catalogue of nuclear-physical constants (half-lives and energies which was compiled from published data
tables of gamma-line outputs obtained experimentally under standardized conditions for different values of the maximum energy
of the bremsstrahlung as well as mathematical models of the monoenergetic gamma-ray spectra) has been used.
The synthesis of 7-bromo-5-[123I]-iodokynurenic acid is described. The tracer was prepared using a nucleophilic non-isotopic exchange reaction from the corresponding bromo derivative. Optimisation of the reaction parameters and HPLC purification were performed and the radiotracer was obtained in a chemical and radiochemical purity >95% and a specific activity of 235 Ci/mol.
Reactions with large negative enthalpy changes are often encountered in the chemical industry. Sometimes they give rise to
technical dangers and hazards, including explosions. This investigation concentrates on examination of adiabatic temperature-time-curves
and gives non-linear optimization procedures for obtaining kinetic parameters of simple decompositions,e.g. o-nitrobezaldehyde, two types of autocatalysis, consecutive reactions and competitive consecutive reactions. The advantage
of this computing method is that only differential kinetic equations are needed.
Authors:Ekhlas H. Karam, Noor S. Abdul-Jaleel, and Basma J. Salah
based the optimization algorithms such as in [ 14–17 ]. These algorithms consist of finding a solution to problems that may minimize or maximize costs. Depending on model reduction methods, many controllers can be simply designed to control the higher
Authors:E. Labarthe, A. J. Bougrine, and H. Delalu
phenomenon appears due to the desiccant power of the sodium sulfate thus produced. The optimization of this step required then the study of the polythermal ternary system H 2 O–Na 2 SO 4 –C 5 H 10 NH [ 1 , 2 ].
The organic liquid obtained from the