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1.
Theodore S. Prokopov 《Mikrochimica acta》1970,58(4):694-701
Summary A non-sulfide scheme of inorganic qualitative microanalysis is presented with solutions of HCl, CH3COONa, H2SO4, and NaOH as group reagents. Color reactions (spot tests) are also included in this scheme. The purpose of this new approach to qualitative analysis is to eliminate disagreeable odor and corosive action of hydrogen sulfide as also to introduce complete group separations leading to more definite analytical results.
Zusammenfassung Ein Schema für die qualitative anorganische Analyse ohne Schwefelwasserstoff mit Salzsäure, Na-Acetat, Schwefelsäure und Natronlauge als Gruppenreagenzien wird vorgelegt. Farbreaktionen (Tüpfelproben) werden im Laufe des Analysenganges verwendet. Die Geruchsbelästigung und die Korrosion durch Schwefelwasserstoff wird vermieden und gleichzeitig eine Gruppentrennung mit eindeutigeren Ergebnissen erzielt.相似文献
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Free electrophoresis and viscometry were used to study the effects of salts (perchlorates, thiocyanates, chlorides and sulphates of uni- and bivalent metals) on the properties of polyacrylamide and polymethacrylamide in aqueous solutions. In salt solutions, in the electric field both polymers behave as polyanions. It may be inferred from electrophoretic measurements that both anions and cations are bound on the polymer chain; the degree of binding depends on the nature of the ions. The viscometric data show that there is a pronounced salting-in effect of cations (increasing with increasing surface charge density); the effect of anions is either secondary (for polyacrylamide) or rather unfavourable to dissolution (for polymethacrylamide). 相似文献
5.
V. A. Vshivtsev A. V. Prokopov A. V. Tatarintsev 《Theoretical and Mathematical Physics》2000,125(2):1568-1577
We derive the thermodynamic characteristics of an ideal gas of diatomic molecules with a nonlinear interatomic interaction,
solving the problem for a wide class of potentials on the classical level, which is permissible for relatively high temperatures.
The nonlinearity of the interaction can yield some characteristic properties of the gas.
Moscow State Institute of Radio Engineering, Electronics, and Automatics (Moscow Technical University), Moscow, Russia
Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 125, No. 2, pp. 315–325, November, 2000. 相似文献
6.
Styrene polymerization in the presence of different initiators and properties of polymer suspensions
I. A. Gritskova S. V. Zhachenkov M. S. Tsar’kova S. M. Levachev G. A. Simakova M. Khaddazh N. I. Prokopov 《Polymer Science Series B》2011,53(11-12):568-577
It is shown that the nature of an initiator affects the molecular mass and molecular-mass distribution of a polymer and, thus, substantially contributes to the strength and rheological characteristics of the interfacial adsorption layer formed on the surface of polymer-monomer particles and the stability of these particles during polymerization. 相似文献
7.
Miloslav Feistauer Václav Kučera Karel Najzar Jaroslava Prokopová 《Numerische Mathematik》2011,117(2):251-288
The paper presents the theory of the discontinuous Galerkin finite element method for the space–time discretization of a nonstationary
convection–diffusion initial-boundary value problem with nonlinear convection and linear diffusion. The problem is not singularly
perturbed with dominating convection. The discontinuous Galerkin method is applied separately in space and time using, in
general, different space grids on different time levels and different polynomial degrees p and q in space and time dicretization. In the space discretization the nonsymmetric, symmetric and incomplete interior and boundary
penalty (NIPG, SIPG, IIPG) approximation of diffusion terms is used. The paper is concerned with the proof of error estimates
in “L
2(L
2)”- and “DG”-norm formed by the “L
2(H
1)”-seminorm and penalty terms. A special technique based on the use of the Gauss–Radau interpolation and numerical integration
has been used for the derivation of an abstract error estimate. In the “DG”-norm the error estimates are optimal with respect
to the size of the space grid. They are optimal with respect to the time step, if the Dirichlet boundary condition has behaviour
in time as a polynomial of degree ≤ q. 相似文献
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E. V. Chernikova N. S. Serkhacheva O. I. Smirnov N. I. Prokopov A. V. Plutalova E. A. Lysenko E. Yu. Kozhunova 《Polymer Science Series B》2016,58(6):629-639
The effect of the chain length of oligomer acrylic acid obtained in the presence of a low-molecularmass trithiocarbonate and the position of trithiocarbonate fragment (within the chain or at the chain end) on the process of emulsion polymerization of n-butyl acrylate and characteristics of the resulting dispersions has been studied for the first time. It has been found that, when using an oligomer with trithiocarbonate group located within the chain in the emulsion polymerization of n-butyl acrylate in a wide range of monomer–water phase compositions, triblock copolymers self-organizing in aqueous medium to give stable particles with the core–shell structure are formed. Oligomers with M n ~ (5–10) × 103 are optimal for synthesis of stable dispersions. In this case, block copolymers with the controlled length of hydrophobic block and a rather narrow MWD may be obtained. Thin films formed from these copolymers retain the structure of the initial dispersions on solvent removal. If the trithiocarbonate group in the oligomer is located at the chain end, the main polymerization product is a diblock copolymer. In this case, the formation of polymer–monomer particles occurs during a longer period of time, the control of MWD is weakened, and the dispersions of particles lose the aggregative stability after thin film formation. 相似文献
10.
E. V. Chernikova A. V. Plutalova K. O. Mineeva D. V. Vishnevetskii E. A. Lysenko N. S. Serkhacheva N. I. Prokopov 《Polymer Science Series B》2016,58(5):564-573
Narrowly dispersed hydrophilic block and random copolymers of acrylic acid and N-isopropylacrylamide of various compositions and molecular masses are synthesized for the first time by controlled radical polymerization via the reversible addition-fragmentation chain-transfer mechanism. The copolymers are used for the synthesis of ternary copolymers with n-butyl acrylate. As shown by dynamic light scattering, the resulting amphiphilic copolymers can form stable dispersions in diluted aqueous solutions. It is found that the effective hydrodynamic radii of dispersion particles may be controlled via variation both in the primary structure of the ternary copolymer, i.e., the amount and sequence of hydrophilic and hydrophobic units, and in the external stimuli, i.e., the temperature and pH of a solution. 相似文献