the kinetics of the potassium thiocyanate transport mediated by dicyclohexyl-18-crown-6 (l) through a bulk liquid membrane is studied experimentally and theoretically. the proposed model is based on the assumption of a pure diffusion of the complex salt [k·l]+scn¯ through the liquid membrane stagnant films at the interfaces. it illustrates the connection between liquid-liquid extraction equilib...

Ž . In this work, we apply the Gibbs–Duhem integration GDI technique to obtain the vapor–liquid equilibrium Ž . VLE properties of hydrogen fluoride according to three potential models. Properties examined include coexistence densities, enthalpy of vaporization, and vapor pressure. The models are representative of the various types of potentials used in simulation studies; namely, a pure pair po...

Vapor-liquid equilibrium and density measurements have been performed on 1.00-5.89 m tetrabutylammonium bromide (TBAB) in mixtures of 2-propanoland water. The VLE experiments were performed using a modified Othmer still a t ambient pressure. The effect of salt on the relative volatility of 2-propanol was evaluated at molalities of 1.00,1.79, and 5.89 over the full range of solvent composition. ...

We would like to give a brief review concerning liquid-liquid equilibrium in binary liquid mixtures under absolute negative pressure. Although negative pressure states are metastable ones, they can be maintained long enough to make phase equilibrium measurements. Several phenomena concerning liquid-liquid equilibrium can be seen only – or can be seen better – under negative pressure; these are ...

While Learners enjoy the sense of presence and rich visualization in 3D Immersive Virtual Learning Environments, they require more interactivity and pedagogical guidance. Intelligent Pedagogical Agents, IPAs, which are autonomous and intelligent software entities can provide such demands if they are employed in the VLE. They provide interactivity (dialogues), increase motivation and engagement,...

The present paper reports the outputs of a focus group examining the perceived uses, enablers and barriers of utilising virtual learning environments (VLEs), amongst a small group of postgraduate teachers. Sixteen pedagogical/teaching functions were identified and were mapped to MacLean and Scott’s (2011) model of VLE elements. Whilst a number of enablers of VLE use were apparent, participants’...

Major histocompatibility complex (MHC) class I tetramer technology has become the central technique for analyzing antigen-specific CD8(+) T cell responses and it has been widely used to explore the differentiation and formation of memory CD8(+) T cells. Previously, a simplified and efficient procedure for preparing high quality HLA-A*0201 tetramers has been established in our lab and the tetram...

Virtual Learning Environments (VLEs) have provided new perspectives for access to information and enhance learning. However VLE have advantages and positive impact on learning, there are still defies to their design and production. This paper focuses on the presentation and comparison of Learning Design approaches used to design and implement a VLE. In the literature, several Learning Design ap...

Methods and study aims: The incidence of esophageal cancer is rising despite increased surveillance efforts. Volumetric laser endomicroscopy (VLE) is a new endoscopic imaging tool that can allow for targeted biopsy of neoplasia in Barrett's esophagus. We report a series of 6 patients with long-segment Barrett's esophagus ( > 3 cm), who underwent a session of endoscopy with volumetric laser endo...

Virtual Learning Environments (VLEs), understood here as online systems supporting interactions between and amongst learners and teachers as well as access to resources and activities, have long been held to provide a range of benefits in further and higher education. For 2008, UK Government policy is far all pupils to have access to an online learning space, for many provided through a learnin...