The behavior of the accelerator grid current defines the operational envelope of an ion optics system. Under normal operating conditions, the ions in the discharge plasma upstream of the screen grid should form focused ion beamlets when extracted and accelerated through the optics. However, if the discharge plasma density is too low, the ion beamlet may become over-focused by the upstream sheat...

The consequences of free trade are investigated in an international duopoly under horizontal di¤erentiation and convex transportation costs. It is shown that the smaller country may bene...t from trade if it is su¢ciently small to allow for a signi...cant volume of exports by the domestic ...rm. On the contrary, the larger country never bene...ts from trade, since liberalization decreases the d...

Mobile-assisted language learning (MALL) is increasingly gaining attention from educational stakeholders. This quantitative study implements the Unified Theory of Acceptance and Use Technology (UTAUT) model with added variable attitude. The participants were 89 Colombian higher education teachers who shared their views on MALL via an online questionnaire. results indicate that teachers’ behavio...

Shopping places have been involved in commercial life various forms throughout history. Today, it has become a public space, called shopping center or mall, and consists mostly of indoor spaces includes different functions other than shopping. These structures, which are located the city centers, taken place urban peripheries with economic developments increase vehicle ownership over time. Whil...

Mobile-assisted language learning (MALL) is a new channel of languages. The usage MALL instructional design integrates mobile devices with educational scenarios teaching foreign study explores the central issue how course could help students to construct an out-of-class experience. research investigates practical characteristics design, which lead acquisition. had three objectives: explore perc...

Abstract Recent years have witnessed numerous systematic investigations on mobile-assisted language learning (MALL). However, very few research synthesis studies focused the higher education context in mainland China. This paper provides a review of findings 23 published between 2015 and 2020 The aim this is twofold: 1) to examine prevalent researched elements extant MALL studies; 2) investigat...

Mobile technologies are one of the fastest-growing in education. They offer an appealing opportunity to access multiple sources information anytime and anywhere. Students who join Dubai Men's College Foundations program suffer from accumulative weakness language skills general listening skill particular. The study aimed confirm positive impact Mobile-Assisted Language Learning (MALL) on English...