We use normal sections to relate the curvature locus of regular (resp. singular corank 1) 3-manifolds in R6 R5) with surfaces R5 R4 ). For example, we show how generate a Roman surface by family ellipses different Steiner’s way. also study relations between and cases through projections. that there is commutative diagram projections which relates loci types manifolds, therefore, second order ge...

This study was an attempt to explore the beliefs of Iranian EFL teachers about the role of grammar in English language teaching in both state schools and private language institutes. Data were collected through a questionnaire developed by Burgess and Etherington (2002), which consisted of 11 main subscales and was divided into two sections. The first section dealt with approaches to grammar te...

objective: zirconia cores have limited light transmittance and data are scarce on light transmission through zirconia cores with and without the veneering ceramic.   methods: in this in vitro study, disc-shaped specimens (11.5 mm in diameter and 0.4 (0.05) mm in thickness) were fabricated of three types of zirconia namely mamut, heany and zirkonzahn (n=5). a disc-shaped specimen (11.5 mm in dia...

Online courses are a large and growing part of the undergraduate education landscape, but many biology instructors are skeptical about the effectiveness of online instruction. We reviewed studies comparing the effectiveness of online and face-to-face (F2F) undergraduate biology courses. Five studies compared student performance in multiple course sections at community colleges, while eight were...

The language register used in academic communities has the special features of density, complexity, and abstractness which are associated with nominalization with which new members of the communities might not be familiar. To explore the possible distance between novice and established members regarding their awareness of this grammatical feature, the present study investigated the employment o...