With the advancement of information and communication technologies, teaching mathematics in a real-life classroom is combined with virtual learning environment (VLE). It important to determine how primary school teacher can use VLE collaboration tools teach students. Participants – 4th grade students ((n = 51). Access quantitative studies has been chosen for study. Methods study: Analysis scien...

BACKGROUND: Although phenol is a key intermediate in the plastics and polycarbonate industry, it also toxic component that requires removal from dilute aqueous streams, potentially by liquid–liquid extraction (LLX). For LLX, cumene suggested as solvent already present processes industry. recovery of distillation, knowledge on vapor–liquid equilibrium (VLE) behavior important, combination with h...

A method based on the Genetic Algorithm (GA) was developed to study the phase behavior of multicomponent and multiphase systems. Upon application of the GA to the thermodynamic models which are commonly used to study the VLE, VLLE and LLE phase equilibria, the physically meaningful values for the Binary Interaction Parameters (BIP) of the models were obtained. Using the method proposed in this ...

After the arrival of the web in the 1990s, educational institutions started to maintain their learning materials within Virtual Learning Environments (VLEs), as the web is a significant source of material for many students and teachers. However, there has been less development in the current VLEs in the past few years, which remain heavily centred on single institutions even though the web has ...

Vapor–liquid equilibrium (VLE) and density data for binary systems of branched alkanes + ethyl acetate are scarce in the literature. In this study, mixtures 3-methylpentane 2,3-dimethylbutane were investigated. Density measurements at atmospheric pressure performed using a vibrating tube meter 293.15, 298.15 303.15 K. Large positive excess molar volumes calculated correlated Redlich–Kister-type...

Here, we present a simple method for optimizing the fitting of molecular parameters involving vapor−liquid equilibria (VLE) and selected secondorder thermodynamic properties and experimental data. The procedure is applied, as an example to the soft Statistical Associating Fluid Theory (soft-SAFT) equation of state. The method involves the introduction and testing of coupling factors ranging fro...

This work reports saturated-phase densities for the CO2 + methylcyclohexane system at temperatures between 298 and 448 K pressures up to critical pressure. The were measured with a standard uncertainty of <1.5 kg·m–3 fitted along isotherms recently developed nonlinear empirical correlation an absolute average deviation (ΔAAD) about 1.5 kg·m–3. also allowed estimation pressure density each tempe...

I construct systems of generalized Pfaff equations (of the form α = 0, α some differential forms), preserved by the exceptional Lie superalgebras ksle(5|10), vle(3|6) and mb(3|8). This yields an intrinsic geometric definition of these algebras. The analogous construction for the contact superalgebra k(1|m) (a.k.a. the centerless N = m superconformal algebra) is reviewed.

A method based on the Genetic Algorithm (GA) was developed to study the phase behavior of multicomponent and multiphase systems. Upon application of the GA to the thermodynamic models which are commonly used to study the VLE, VLLE and LLE phase equilibria, the physically meaningful values for the Binary Interaction Parameters (BIP) of the models were obtained. Using the method proposed in this ...

This chapter attempts to address the need for more research on virtual team effectiveness and outlines an ecological theoretical framework that is applicable to virtual learning environments (VLE). Prior empirical studies on virtual team effectiveness used frameworks of traditional team effectiveness and mainly followed Hackman's normative model (input-process-output). We propose an ecological ...