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...

By proposing a predictive method with no adjustable parameter and by using infinite dilution activity coefficients of components in binary mixtures obtained from UNIFAC model, the binary interaction parameters (k12) in van der Waals mixing rule (vdWMR) and Orbey-Sandler mixing rule (OSMR) have been evaluated. The predicted binary interaction parameters are used in Peng-Robinson-S...

The working fluids are crucial for developing the absorption refrigeration system. Our previous work has proposed three novel pairs, which uses low-GWP HFCs (R32, R152a and R161) as refrigerants polyethylene-glycol dimethylether solvent DMETEG absorbent. To explore VLE behaviors of in other longer chain structures solvents, modified UNIFAC (Dortmund) model was applied prediction. binary paramet...

by proposing a predictive method with no adjustable parameter and by using infinite dilution activity coefficients of components in binary mixtures obtained from unifac model, the binary interaction parameters (k12) in van der waals mixing rule (vdwmr) and orbey-sandler mixing rule (osmr) have been evaluated. the predicted binary interaction parameters are used in peng-robinson-stryjek-vera equ...

Authoring tools in Intelligent Tutoring Systems (ITS) are designed to make it easier for tutors the use of Artificial Intelligence tools. Authoring tools allow tutors to develop adaptive, learner-centered courses that promote interaction between students and virtual tutors. This article presents a review of Virtual Reality (VR) tools for the creation of Virtual Learning Environments (VLE). In p...

Virtual Learning Environments are a relatively new concept and little research is done to positive effects of a VLE on the learning process of children. Due to its success in conventional learning methods interactivity is often taken for granted in a successful VLE. A close study of some literature on experiments with observations of VLE’s, make clear that interactivity in a VLE can have its dr...

This paper presents preliminary results of a mobile virtual learning environment (VLE) usage study conducted at a United Kingdom (UK) distance education institution. A total of 207 undergraduate students participated in the study over a period of 6 months. Study participants were recruited through email invitation. An online survey was conducted to gather both quantitative and qualitative data ...

Abstract In recent years, many compounds have been proposed as additives to conventional working fluids improve the performance of absorption refrigeration system. The main aim this research is show influence ionic liquid based on thermodynamic and physicochemical properties {LiBr + water} solutions. following additives: 3-(1-methyl-morpholinium)propane-1-sulfonate, N,N -di(2-hydroxyethyl)- -di...