Text-based discussions in Asynchronous Learning Networks (ALN) may not be an optimal learning environment for all learners. This paper discusses the reasons why and explores the possibility of applying multimedia to ALN. The contribution of this paper is to provide ways of diversifying the ALN learning environment to accommodate the needs of diverse learners having different learning styles.

on AlN using AlN/GaN/AlN quantum wells and N isotopes Meng Qi, Guowang Li, Vladimir Protasenko, Pei Zhao, Jai Verma, Bo Song, Satyaki Ganguly, Mingda Zhu, Zongyang Hu, Xiaodong Yan, Alexander Mintairov, Huili Grace Xing, and Debdeep Jena Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA Ioffe Physico-Technical Institute, Russian Academy of Sciences, Saint Petersbu...

CONTEXT Alendronate (ALN) is a bisphosphonate compound that can be administered orally and has potential use in pediatric osteoporotic conditions. OBJECTIVE The objective was to evaluate the pharmacokinetics and single-dose tolerability of ALN in children with osteogenesis imperfecta. DESIGN ALN was administered iv and orally in a two-period, randomized crossover study, with doses separated...

Cr-doped AlN thin fi lms were epitaxially grown on Al2O3(001) substrates at lowtemperature by reactivemagnetron sputtering,and their magnetic properties were investigated. Extensive x-ray diffraction studies indicated that the fi lms have a wurtzite-type hexagonal structure and are (001) oriented, with an epitaxial relationship of the [100] direction of the fi lms along the [110] direction of A...

Novel three-dimensional AlN microroses, for the first time, have been synthesized via direct reaction between Al and N(2) in arc plasma without any catalyst and template.

Aluminum nitride (AlN) film coatings have been obtained by a new technique of hybrid helikon-arc ion-plasma deposition. Possibility to combine the magnetic-filtered arc plasma deposition technique with a treatment in RF plasma of helicon discharge allowed us to deposit AlN coatings on thermolabile substrates, significantly increasing the deposition rate. A study of spectral properties of AlN fi...

The quantum-confined stark effect induced by polarization has significant effects on the optical properties of nitride heterostructures. In order to improve the emission efficiency of GaN/AlN quantum dots [QDs], a novel epitaxial structure is proposed: a partially relaxed GaN layer followed by an AlN spacer layer is inserted before the growth of GaN QDs. GaN/AlN QD samples with the proposed str...

In order to develop a film electrode for the surface acoustic wave (SAW) devices working in high temperature, harsh environments, novel AlN/Pt/ZnO multilayers were prepared using pulsed laser deposition (PLD) systems on langasite (LGS) substrates. The AlN film was used as a protective layer and the ZnO buffer layer was introduced to improve the crystal quality of Pt films. The results show that...

Our study proposes in situ synthesis of cold-rollable aluminum nitride (AlN) reinforced aluminum matrix composites with attractive thermal properties via arc plasma-induced accelerated volume nitridation (APAVN). Within three minutes of repeated APAVN using commercial nitrogen gas, volume fraction of AlN increased up to 40 vol%, which is the highest value ever reported by in situ nitridation of...

Aluminium nitride (AlN) one-dimensional (1D) nanostructures, including crystalline nanowires, faceted nanotubes and conventional single-walled nanotubes, were investigated by means of density functional theory (DFT) using the generalized gradient approximation (GGA). While the larger diameter crystalline nanowires are the most favoured energetically of all these 1D nanostructures, the thick fac...