By a dissection of the data obtained by Driver on the effective periods at different temperatures in males and females of an ultrabar stock of Drosophila melanogaster it has been found that a symmetrical sigmoid curve satisfactorily describes the time course of the facet-determining reaction. Consequently the differences between members of the bar series in regard to this reaction do not repres...

The Kinetic studies were made of the reactions between triphenylphosphine, dialkyl acetylenedicarboxylates in the presence of NH-acid, such as harman. To determine the kinetic parameters of the reactions, they were monitored by UV spectrophotometery. The second order fits were automatically drawn and the values of the second order rate constant (k2) were calculated using standard equations with...

The flow stress and dynamic recrystallization behavior of A356 aluminum alloy was studied, with a strain rate ranging from 0.001 s?1 to 1 temperature 300 500 °C. Both the true stress–strain curves microstructure examination indicated that occurred during isothermal compression. A physical model based on Arrhenius equation developed, this can accurately predict fraction Finally, implemented in F...

4 ABSTRACT: In this work, an Arrhenius-based model for the 5 high-temperature reduction and oxidation of CeO2 is 6 developed. The model is shown to agree well with both 7 literature data for the equilibrium oxygen vacancy concen8 tration and novel experimental kinetics of oxidation and 9 reduction obtained by the authors. The form of the Arrhenius 10 rate equation was determined from the proper...

modeling of drying kinetics of canola was studied at 30 to 100 ?c in a lab scale fluidized bed dryer. drying rate of the crop was assessed, using many conventional moisture ratio models employed in food science. effective diffusivity coefficient (deff) and activation energy (ea) of kernel moisture were determined using fick's law of diffusion and arrhenius equation. besides, the effects of...

Ionic transport in conventional ionic solids is generally considered to proceed via independent diffusion events or "hops." This assumption leads to well-known Arrhenius expressions for transport coefficients, and is equivalent to assuming diffusion is a Poisson process. Using molecular dynamics simulations of the low-temperature B1, B3, and B4 AgI polymorphs, we have compared rates of ion hopp...

Self-assembly of a binary monolayer of charged particles is modeled using molecular dynamics and statistical mechanics. The equilibrium phase diagram for the system has three distinct phases: an ionic crystal; a geometrically ordered crystal with disordered charges; and a fluid. We show that self-assembly occurs near the phase transition between the ionic crystal and the fluid, and that the rat...

Pedal progression of the slug Limax maximus was studied to obtain relations between wave velocity on the sole of the foot, wave frequency, the advance due to a single wave, and the velocity of vertically upward creeping. Each of the first three quantities is directly proportional to the simultaneous velocity of progression. Under comparable conditions, that is when work is done at a constant ra...

1. The sulfonium salt H.2TDG is formed when H is mixed with even dilute solutions of TDG. Crystalline H.2TDG was isolated from such a reaction mixture. A simple method of preparation of this salt is outlined. 2. A material which differs from H.2TDG in that it hydrolyzes faster, is formed when H hydrolyzes in water. This material is probably H.1TDG but it was not isolated. Approximately 5 to 8 p...