Phenols were nitrated regioselectivity with NH4NO3 in the presence of KHSO4 as a catalyst in high yields. Key Words: Nitration, Phenols, NH4NO3, KHSO4.

The chorology of Turkish moss species of Andreaeaceae, Archidiaceae, Aulacomniaceae, Amblystegiaceae and Anomodontaceae families is given in dotted squares according to Henderson’s [1] system in the map of Turkey.   Key words: Flora, Musci, Turkey.

Let G be simple, connected weighted graphs, where the edge weights are positive definite matrices. In this paper, we will ive an upper bound on the spectral radius of the adjacency matrix for a graph G and characterize graphs for which the…

Agarose gel electrophoresis was used to determine the electrophoretic pattern of the haemoglobin of Hystrix cristata (H. cristata), and that of a healthy human. Alkaline agarose gel electrophoresis of the haemoglobin of H. cristata revealed that the mobility of the…

Projective geometry is used to decode and represent codes easily. Cameron [1] generated a binary linear code from PG(2,2). In this paper we construct a binary linear code from PG(3,2). Also we give a decoding rule for this code. A…

In this study, first the radiation properties of a small Cassegrain antenna for 10λ were examined. Next the source of spillover is discussed, and parametric curves showing losses as a function of the Cassegrain design parameters are presented. These results…

ABSTRACTIn this paper the characterization of certain families of the Pk   sets for k=3(4) are given, and it is shown that some of them can not be extended.  Key Words: Diophantine Equation, Congruence, Legendre Symbol

ABSTRACTIn this study, free vibration of shear deformable beams was investigated. Discrete singular convolution (DSC) method is used for free vibration problem of numerical solution of shear deformable beams. Numerical results are presented and compared with that available in the…

ABSTRACTSome new (N-indolidene-DL-glycine, N-indolidene-DL-alanine and N-indolidene-DL-valine) amino acid-Schiff bases were prepared by the condensation of indole-3-carboxaldehyde and DL-glycine, DL-alanine and DL-valine and characterized by elemental analysis, IR, UV-Vis, 1H-NMR spectroscopy and 13 C-NMR spectroscopy. Antimicrobial activities of the amino acid-Schiff…

ABSTRACTIn this study, it was obtained kernel estimation of probability density function for the earthquakes data with magnitude at least 5 on Ricther scale occuring between 1990-2001 years in Turkey. Key Words: Density estimation of probability density function, bandwidth selection, cross-validation.