the goal of this study was to investigate the effect of using computer conceptual maps­, compared with  usual way of drawing them by pencil and paper­, in increasing learning, recalling and educational progress motivation in geology course among high school students. the study was conducted in semi experimental method in which students of 3 classes were classified in 3 groups. (group 1: common ...

in this paper, we give a characterization of strongly jordan zero-product preserving maps on normed algebras as a generalization of  jordan zero-product preserving maps. in this direction, we give some illustrative examples to show that the notions of strongly zero-product preserving maps and strongly jordan zero-product preserving maps are completely different. also, we prove that the direct p...

Matchbox manifolds are foliated spaces whose transversal spaces are totally disconnected. In this work, we show that the local dynamics of a certain class of minimal matchbox manifolds classify their total space, up to homeomorphism. A key point is the use Alexandroff’s notion of a Y –like continuum, where Y is an aspherical closed manifold which satisfies the Borel Conjecture. In particular, w...

A bstract By fibering the duality between E 8 × heterotic string on T 3 and M-theory K3, we study duals of compactified G 2 orbifolds form 7 / $$ {\mathbb{Z}}_2^3 ? 2 3 . While compactification space is straightforward, description gauge bundle su...

In this article we study compact Kähler manifolds admitting nonsingular holomorphic vector fields with the aim of extending to this setting the classical birational classification of projective varieties with tangent vector fields. We introduce and analyze a particular type of deformations, that we call tangential deformations, and we prove that each compact Kähler manifold X with nowhere vanis...

Let M be a closed oriented manifold, and let Sg denote the closed surface of genus g; unless otherwise specified, assume g ≥ 2. A surface bundle over M is a fiber bundle with base space M and fiber Sg. The study of surface bundles in low dimensions unites ideas in the topology of manifolds of dimensions one, two, three, and four. The Virtual Fibering Conjecture (recently resolved) asserts that ...

We have recently synthesized [Ni (MAP) ] complex [H-MAP= 2- (methylamino) pyridine]. 2- (Methy1amino)pyridine reacts with MeLi in THF and generates the lithium salt (Li-MAP). Further reaction of NiCl with two equivalent of this ligand in THF leads to the formation of a dark red solution. Analytical data, molecular weight, and magnetic susceptibility of this complex confirm the formula [N...

background: to check the feasibility of using geographical information system (gis) methods, we linked the brucellosis data of human and animals. methods: in a village-based ecological study in bardsir- a district in kerman province located nearly to the central part of iran- data of human brucellosis, socio-economic level, and livestock characteristics (2001-4) were linked by using gis methods...