Adhesion Properties of Films of Polypyromellitimide Modified in a Direct-Current Discharge

Adhesion properties of films of polypyromellitimide modified in a direct-current discharge on the anode are investigated. The peeling strength in when in contact with a series of polymers and with the use of adhesives of different chemical natures is measured using the T-peel test according to ASTM 1876–01. It is shown that the action of a direct current discharge on the films of polypyromellitimide makes it possible to substantially improve the adhesion properties of the polymer to adhesives of different types.     

The Order of Convergence of Difference Schemes for Fractional Equations

In this paper, we continue our research on convergence of difference schemes for fractional differential equations. Using implicit difference scheme and explicit difference scheme, we have a deal with the full discretization of the solutions of fractional differential equations in time variables and get the order of convergence.     

Kinetics of Phenol Oxidation under Flash Corona Electric Discharge

A study was made of the kinetics of phenol oxidation in a 3.5-l (liquid) tank at the initial chemical oxygen demand of the solution of 200-6000 mg O l^-1. The total current of flash corona electric discharge from 50 electrodes was 3 mA.     

Degradation of Formic Acid in Different Oxidative Processes

Abstracts—The decomposition of formic acid by OH radicals produced upon UV irradiation of hydrogen peroxide or in a spark corona discharge between solid electrodes and water surface was studied. Experimental data for both processes are rationalized in terms of the same scheme of transformation of formic acid and various schemes of interaction of active species. The degradation yields in these processes are compared with those obtained in a radiation-chemical process. The yields with reference to the efficiency of the devices were shown to be close in value in all cases.     

On multiplicative perturbations of C 0 -groups and C 0 -cosine operator functions

Certain convolution operators of the form (K f) (t) = A∈t ₀ ^t L(t-s) f(s) ds , where A is the infinitesimal generator of either a C ₀ -group or a C ₀ -cosine family in a Banach space E , are considered. We obtain several lifting results guaranteeing that the continuity of K from L ^p to L ^q implies the continuity of K from L ^p to L ^∈ fty . These results are applied to the study of multiplicative perturbations of C ₀ -groups and C ₀ -cosine families in Banach spaces and to the study of the Maximal Regularly Property (MRP) in L ^p , 1 ≤ p ≤ +∈fty , for second-order Cauchy problem. It is proved that the MRP is equivalent to the boundedness of the infinitesimal generator. April 30, 1999     

Peroxynitrous acid formation induced by air spark plasma radiation

The reaction of the stable free radical diphenylpicrylhydrazyl (DPPH^·) with water treated by plasma radiation of air spark discharge immediately after irradiation and for 13 days after irradiation has been studied. The choice is due to the fact that peroxynitrous acid ONOOH, which can be generated by irradiation, is a donor of atomic hydrogen and the reaction with DPPH^· allows the acid concentration to be determined. The formation of ONOOH has been detected by the 4th day after the treatment, [ONOOH] = (1.5 ± 0.5) × 10^?5 mol/L. This finding confirms the earlier assumption that a complex containing peroxynitrite and peroxynitrous acid is produced in water and decomposes within 13 to 14 days.     

Semigroups of operators,cosine operator functions,and linear differential equations

This survey presents a systematic exposition of the elements of the theory of operator semigroups (OS's) in Banach space from Hille-Yosida to the end of 1989. There is a parallel exposition of the theory of cosine operator functions (COF's). The paper contains the following divisions: Linear differential equations in Banach space, reduction of the Cauchy problem for second order equations to the Cauchy problem for first order equations, one-parameter OS's and COF's. differentiable OS's. analytic OS's. Fredholm OS's. positive OS's. stable OS's. spectral properties of OS's and COF's. compactness properties of OS's and COF's. uniformly continuous OS's and COF's. almost periodic OS's and COF's. uniformly bounded OS's and COF's. the theory of perturbations for OS's and COF's. ad joint OS's and COF's.Translated from Itogi Nauki i Tekhniki, Seriya Matematicheskii Analiz, Vol. 28, pp. 87–202, 1990.     

Modification of Polyvinyltrimethylsilane in Direct-Current Discharge

High Energy Chemistry - The modification of polyvinyltrimethylsilane under treatment by direct-current discharge at a reduced pressure has been investigated. Polymer films were placed at the anode...