نتایج جستجو برای: two step surface reactions
تعداد نتایج: 3221752 فیلتر نتایج به سال:
The kinetics of the reactions between triphenylphosphine 1 and dialkyl acetylenedicarboxylates 2, in the presence of a NH-acid such as 5-nitroindazole 3,were studied. Corresponding kinetic parameters to all reactions were evaluated, with the second order rate constant (k) values calculated. Effects of solvent, temperature, and reactant...
this is an original study on the effect of a polyisobutylene – polydimethylsiloxane (pibpdms) block copolymer modifier used as an interfacial active agent on the dynamics behaviour of single newtonian drops suspended in a polyisobutylene (pib) newtonian matrix. the results were divided in two sections. the first part included the experiments carried out on the non-modified and 2% block cop...
the kinetics of the reactions between triphenylphosphine 1 and dialkyl acetylenedicarboxylates 2, in the presence of a nh-acid such as 5-nitroindazole 3,were studied. corresponding kinetic parameters to all reactions were evaluated, with the second order rate constant (k) values calculated. effects of solvent, temperature, and reactants (dialkyl acetylenedicarboxylates) structure and concentrat...
in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...
the interaction between 4, 7, 13, 16, 21, 24 - hexaoxa-1,10 - diazabicyclo [8.8.8] hexacosane (c222) and 7,7,8,8- teracyanoquinodimethane (tcnq) has been studied in chloroform at 25°c. the results indicate a two step mechanism. at the first step, two adducts (assign as p1 and p2) are formed through equilibrium reactions. in continue and through nonequilibrium reactions the adducts are converted...
Step-flow growths of diamond on single-layer steps of hydrogenated diamond (001) surface have been investigated using the semiempirical molecular orbital method PM5. The chemical reactions at the first stage of growth have been calculated as a function of the charges biased to the substrates. When the frontier orbits of a pair of surface hydrogen atoms of step edge by negative charge 2 interact...
امروزه رقابت تنگاتنگی برای ساخت adc های کم مصرف تر و سریعتر در جریان است که در این بین adc های sar بیش از دیگر انواع مورد توجه قرار گرفته اند که در این رساله نیز چنین ساختاری به منظور برخورداری از توان کم برگزیده شده است. برای افزایش سرعت مدار از معماری two-step نیز استفاده کردیم تا در عین حال که انرژی مصرفی کم است سرعت مدار نیز افزایش یابد، چراکه این خانواده از adc ها از خانواده های پر سرعت بش...
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