1. Statement of results and outline of method. The purpose of this note is to announce results dealing with convolution operators on the Heisenberg group. As opposed to the well-known situation where the kernels are homogeneous and C°° away from the origin, the kernels we study are homogeneous but have singularities on a hyperplane. Convolution operators with such kernels arise in the study of ...

background: the heterogeneous composition of the human body presents numerous tissue types and cavities with widely differing radiologic properties. the aim of the present work was to develop a low cost homogeneous and heterogeneous phantom and the absorbed dose were measured by ionization chamber for different radiotherapy treatment techniques and compared with treatment planning system absorb...

The purpose of this study was to investigate the impact of weblog task assessment on Iranian EFL learners’ reading ability. To this purpose, a group of 30 English language students (both male and female) in Rozaneh Language Institute in Najafabad were selected based on their performance on the OPT. The researchers tried to select a homogeneous sample in terms of age factor and proficiency level...

Group formation in e-learning environments is a challenging area. In this paper we present a web-based group formation tool that supports the instructor to create both homogeneous and heterogeneous groups based on up to three criteria and the learner to negotiate the grouping. Moreover, the instructor is allowed to manually group students based on specific criteria. A discriminative feature of ...

We give strengthened versions of the Herwig–Lascar and Hodkinson–Otto extension theorems for partial automorphisms of finite structures. Such strengthenings yield several combinatorial and group-theoretic consequences for homogeneous structures. For instance, we establish a coherent form of the extension property for partial automorphisms for certain Fräıssé classes. We deduce from these result...

this paper aims at investigating the acquisition of italian complex predicates by native speakers of persian. complex predication is not as pervasive a phenomenon in italian as it is in persian. yet italian native speakers use complex predicates productively; spontaneous data show that persian learners of italian seem to be perfectly aware of italian complex predicates and use this familiar fea...

Motivated by recent best case analyses for some sorting algorithms and based on the type of complexity we partition the algorithms into two classes: homogeneous and non-homogeneous algorithms.1 Although both classes contain algorithms with worst and best cases, homogeneous algorithms behave uniformly on all instances. This partition clarifies in a completely mathematical way the previously ment...

We use a systematic construction method for invariant connections on homogeneous spaces to find the Einstein-SU (n)-Yang-Mills equations for Friedmann-Robertson-Walker and locally rotationally symmetric homogeneous cosmologies. These connections depend on the choice of a homomorphism from the isotropy group into the gauge group. We consider here the cases of the gauge group SU (n) and SO(n) whe...