An ideal I on a cardinal κ is called rigid if all automorphisms of P (κ)/I are trivial. An ideal is called μ-minimal if whenever G ⊆ P (κ)/I is generic and X ∈ P (μ)V [G] \ V , it follows that V [X] = V [G]. We prove that the existence of a rigid saturated μ-minimal ideal on μ+, where μ is a regular cardinal, is consistent relative to the existence of large cardinals. The existence of such an i...

The study of the motion a rigid body on plane (RBP motion) is usually one most challenging topics that students face in introductory physics courses. In this paper, we discuss couple problems which are typically used basic courses, order to highlight some aspects related RBP not well understood by students. first problem pendulum composed rod and disk. angular frequency calculated two situation...

The dynamics equations governing the motion of mechanical systems composed of rigid bodies coupled by holonomic and nonholonomic constraints are derived. The underlying method is based on a natural orthogonal complement of the matrix associated with the velocity constraint equations written in linear homogeneous form. The method is applied to the classical example of a rolling disk and an appli...

Geometric confinements play an important role in many physical and biological processes significantly affect the rheology behavior of colloidal suspensions at low Reynolds numbers. On basis linear Stokes equations, we investigate theoretically computationally viscous azimuthal flow induced by slow rotation a small spherical particle located vicinity rigid no-slip disk or inside gap between two ...

The entity–relationship (ER) model, a powerful means for business and data modeling, needs to be enriched with new semantics as the real world changes and its understanding improves. This paper attempts at enriching the ER model based on association rules (AR) discovered from large databases by introducing specializations and sub-types into the ER model. The proposed framework is extended to de...

Relational databases scattered over the web are generally opaque to regular web crawling tools. To address this concern, many RDB-to-RDF approaches have been proposed over the last years. In this paper, we propose a detailed review of seventeen RDB-to-RDF initiatives, considering end-to-end projects that delivered operational tools. The different tools are classified along three major axes: map...

We address the problem of semantic querying of relational databases (RDB) modulo knowledge bases using very expressive knowledge representation formalisms, such as full first-order logic or its various fragments. We propose to use a first-order logic (FOL) reasoner for computing generic answers to deductive queries, with the subsequent instantiation of these generic answers using a conventional...

α-Thalassemia is a widespread inherited disease particularly prevalent in the middle East Asia population, including Iran. The aim of this study was to define the molecular spectrum and frequency of α-thalassemia mutations in prospective couples of Qazvin province. A total of 120,000 subjects were studied during 10 years (1998-2008). Individuals present with hypochromic and microcytic parameter...