Binary system

About: Binary system is a research topic. Over the lifetime, 5788 publications have been published within this topic receiving 97882 citations.

Applied Aspects of the γ-Radiolysis of C1–C4 Alcohols and Binary Mixtures on Their Basis

Abstract: Generalized data on the γ-radiolysis of aliphatic C1–C4 alcohols are summarized These data can be used for solving practical problems in the related areas of research In particular, a rate equation that relates the radiation-chemical yield of an 1 : 1 adduct formed from saturated and unsaturated components upon the γ-radiolysis of a binary system to the concentrations of these components was derived An equation was obtained for estimating the reaction rate constants of decay of identical hydroxyalkyl radicals in collisions with each other from the reciprocal viscosity (fluidity) of corresponding alcohols An empirical equation for calculating the concentration of the free (desolvated) form of formaldehyde in alcohol–formaldehyde systems at various temperatures and total formaldehyde concentrations and an equation for evaluating solvent concentrations in these systems were derived

Uranyl(VI) nitrate salts: modeling thermodynamic properties using the binding mean spherical approximation theory and determination of "fictive" binary data.

Abstract: This work is aimed at a description of the thermodynamic properties of highly concentrated aqueous solutions of uranyl nitrate at 25 °C. A new resolution of the binding mean spherical approximation (BIMSA) theory, taking into account 1-1 and also 1-2 complex formation, is developed and used to reproduce, from a simple procedure, experimental uranyl nitrate osmotic coefficient variation with concentration. For better consistency of the theory, binary uranyl perchlorate and chloride osmotic coefficients are also calculated. Comparison of calculated and experimental values is made. The possibility of regarding the ternary system UO2(NO3)2/ HNO3/H2O as a “simple” solution (in the sense of Zdanovskii, Stokes, and Robinson) is examined from water activity and density measurements. Also, an analysis of existing uranyl nitrate binary data is proposed and compared with our obtained data. On the basis of the concept of “simple” solution, values for density and water activity for the binary system UO2(NO3)2/H2O are proposed in a concentration range on which uranyl nitrate precipitates from measurements on concentrated solutions of the ternary system UO 2(NO3)2/ HNO3/H2O. This new set of binary data is “fictive” in the sense that the real binary system is not stable chemically. Finally, a new, interesting predictive capability of the BIMSA theory is shown.

Removal of lead and copper metal ions in single and binary systems using biopolymer modified spinel ferrite

Abstract: In present study, Zinc Ferrite-Alginate beads (ZFN-Alg beads) were prepared and characterized by Fourier Transform-Infra Red (FT-IR); X-Ray Diffraction (XRD); Scanning Electron Microscope (SEM); Energy Dispersive Spectra (EDS); Thermogravimetric-Differential Thermal analysis (TG-DTA); Brunauer-Emmett-Teller (BET) and pH point zero charge (pHPZC) method. The adsorption of Pb(II) and Cu(II) ions on ZFN-Alg beads as function of contact time, varying pH, adsorbent dose, initial concentration at different temperatures were investigated in single as well as binary system through batch mode. The adsorption kinetic data of Pb(II) and Cu(II) ions in both type of systems was well followed by the Lagergren pseudo second order model. Among different isotherm models, the equilibrium data was well correlated by Langmuir isotherm model in single as well as binary system. In single system, the maximum adsorption capacities of Pb(II) and Cu(II) ions for ZFN-Alg beads were 108.8, 106.6 mg/g and for binary system were 68.6 and 48.0 mg/g, respectively. For both types of systems, the calculated adsorption thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic in nature. The regeneration performance of ZFN-Alg beads was examined in both types of systems up to five cycles. The results revealed that ZFN-Alg beads were retained around 80% regeneration efficiency even after five successive cycles in both types of systems. The present study concluded that magnetic biopolymer beads might be suitable and cost effective alternative for removal of Pb(II) and Cu(II) metal ions from single as well as binary system.

High fill-out, extreme mass ratio overcontact binary systems. x. the newly discovered binary xy leonis minoris

Abstract: The newly discovered short-period close binary star, XY LMi, has been monitored photometrically since 2006. Its light curves are typical EW-type light curves and show complete eclipses with durations of about 80 minutes. Photometric solutions were determined through an analysis of the complete B, V, R, and I light curves using the 2003 version of the Wilson-Devinney code. XY LMi is a high fill-out, extreme mass ratio overcontact binary system with a mass ratio of q = 0.148 and a fill-out factor of f = 74.1%, suggesting that it is in the late evolutionary stage of late-type tidal-locked binary stars. As observed in other overcontact binary stars, evidence for the presence of two dark spots on both components is given. Based on our 19 epochs of eclipse times, we found that the orbital period of the overcontact binary is decreasing continuously at a rate of dP/dt = -1.67 x 10(-7) days yr(-1), which may be caused by mass transfer from the primary to the secondary and/or angular momentum loss via magnetic stellar wind. The decrease of the orbital period may result in the increase of the fill-out, and finally, it will evolve into a single rapid-rotation star when the fluid surface reaches the outer critical Roche lobe.