Mobile communication provides access to the outside world without borders everywhere and at any time. The learning method that related to mobile communication technology is known as mobile learning (M-learning). It is a method that communicates learning materials with mobile device technology. The purpose of this method is to increase the interest in learning among students and assist them in o...

Tribology Transactions Publication details, including instructions for authors and subscription information: http://www.informaworld.com/smpp/title~content=t713669620 Surface Chemistry of Chlorinated Hydrocarbon Lubricant Additives--Part I: Extreme-Pressure Tribology P. V. Kotvis a; W. T. Tysoe b a Frank P. Farrell Laboratory, Benz Oil, Inc., Milwaukee, Wisconsin b Department of Chemistry and L...

The present research reports the synthesis of poly-N-isopropylacrylamide / mesoporous carbon composites, prepared by radical polymerization of N-isopropylacrylamide inside mesoporous carbon pores functionalized with carboxylic groups. The deposition of poly-N-isopropylacrylamide on mesoporous carbon was confirmed by FT-IR spectroscopy, TEM, N2-sorption measurements. The mesoporous carbon materi...

A polynomial representation of a convex d-polytope P is a finite set {p1(x),. .. , pn(x)} of poly-nomials over R d such that P = ˘ x ∈ R d : p1(x) ≥ 0 for every 1 ≤ i ≤ n ¯. By s(d, P) we denote the least possible number of polynomials in a polynomial representation of P. It is known that d ≤ s(d, P) ≤ 2d − 1. Moreover, it is conjectured that s(d, P) = d for all convex d-polytopes P. We confirm...

Multicompartment disks with bumpy edges could be synthesized controllably by dissolving a linear ABC amphiphilic triblock copolymer of polystyrene-b-polybutadiene-b-poly (2-vinylpridine) (PS440-b-PBd1020-b-P2VP114) in selective solvent mixtures of toluene and methanol. The disk size was controllable by the initial copolymer concentration. Diameter of the disks increased with the increase of the...

A finite family C of convex polytopes in a Euclidean space shall be called a complex provided (i) every face of a member of C is itself a member of C; (ii) the intersection of any two members of C is a face of both. If P is a d-polytope (i.e., a ^-dimensional convex poly tope) we shall denote by B(P) the boundary complex of P , i.e., the complex consisting of all faces of P having dimension d— ...

The formal light-cone properties of commutators involving current divergences are studied in the gluon model. Relations are derived which make it possible (in principle) to distinguish the vector from the (pseudo) scalar gluon model. In the vector gluon model these relations provide an experimental determination of the bare quark masses. The additional assumption that the residues of any a! = 0...