Hierarchical BEA zeolite was prepared through desilication or followed by acid treatment. The catalytic performance of samples evaluated using Friedel-Crafts acylations with two substrates different molecular sizes, furan (5.7 Å) and benzofuran (6.9 Å), in the presence acetic anhydride as acylating agent. application simplified Langmuir-Hinshelwood kinetic model showed that size substrate leads...

The use of methanesulfonic acid as a Brønsted acid for direct ortho-acylation of phenols and naphthols proves to be a convenient, more general and direct route to various hydroxyaryl ketones. The route is regioselective, leading to ortho C-acylated products in satisfactory to high yields in most cases. The solvent free reactions described below exhibited environmentally benign in terms of faste...

this study mainly concentrates on metallurgical structure of the ferrous ancient crafts, specially the discovered ferrous man-made pieces in ilam which are aged more than 3000 years. the pieces were discovered in ize a town located in the south east of ahvaz , in the southern of iran. the crafts include an ferrous bar, a 3-side and a 4 side bayonets which were microscopically studied by electro...

The pilot project MERCUR investigated the potentials of E-Learning in the crafts sector in Germany. The focus of research and development was on the design of a virtual academy for the crafts sector and an internet-based learning environment. This article exemplifies the experiences of learners and teachers. 1. DEVELOPMENT AND TESTING OF E-LEARNING IN THE CRAFTS TRADE In the passed years E-Lear...

In this article, the historical use of crafts in occupational therapy for the physically disabled patient is reviewed and the results of a survey aimed at describing current craft use is presented. A questionnaire was sent to a random sample of 250 occupational therapists throughout the United States who chose physical disabilities as their specialty section. Results demonstrated that, while mo...