In this paper we classify the centers and the isochronous centers of certain polynomial differential systems in R2 of degree d ≥ 5 odd that in complex notation can be written as ż = (λ+ i)z + (zz̄) d−5 2 (Az +Bzz̄ + Czz̄ +Dzz̄ + Ezz̄ + F z̄), where λ ∈ R and A,B,C,D,E, F ∈ C. Note that if d = 5 we obtain the full class of polynomial differential systems of the form a linear system with homogeneous po...

The paper studies L∞(IR )-norm approximations from a space spanned by a discrete set of translates of a basis function φ. Attention here is restricted to functions φ whose Fourier transform is smooth on IR\0, and has a singularity at the origin. Examples of such basis functions are the thin-plate splines and the multiquadrics, as well as other types of radial basis functions that are employed i...

background: in the present era, delinquency in children and adolescents is undoubtedly a difficult and upsetting issue attracting the attention of many experts such as psychologists, sociologists, and criminologists. these experts often try to answer why a number of children and adolescents engage in various crimes such as aggressive and anti-social crimes. they also try to find out how these c...

objective: one of the most important goals of marriage is the will to attain marital satisfaction. marital ‎satisfaction is of prime importance and has the highest effect on the stability and failure of the ‎marriage. this study aimed to investigate marital satisfaction in the women who referred to ‎gorgan health centers.‎ method: this was a descriptive-analytical study conducted in gorgan. two...

the primary health care has notable effects on community health and accreditation is one of the appropriate evaluation methods that led to health system performance improvement, therefore, this study aims to developing of national accreditation model for rural health centers in iran health system.firstly the suitable accreditation models selected to benchmarking worldwide via systematic review,...

acoustic experimental data of irib (islamic republic of iran broadcasting) server room was taken to measure the acoustic noise characteristics of frequency and sound pressure level (spl). the purposes of this paper are measuring the noise pollution and its evaluation through the regulations. the measurements were taken in two stages. the first one was taken at 10 points by sound investigator 22...

background organizational entrepreneurship focuses on proactive actions, which may lead to the new productions, new services and/or new processes. implementation of organizational entrepreneurship plans has many benefits including organizational cost reduction and the increase of organizational capital assets. objectives this study aimed to investigate the organizational entrepreneurship status...