Communicative language use largely entails regular patterns consisting of pre-constructed phrases or sequences. These sequences have been examined by many researchers to find the situation-based formulas which may help L2 learners follow a possibly more target-like speaking system. This study, therefore, explored two categories of formulaic expressions including speech formulas and situation-bo...

in this paper, we give some determinantal and permanental representations of generalized lucas polynomials, which are a general form of generalized bivariate lucas p-polynomials, ordinary lucas and perrin sequences etc., by using various hessenberg matrices. in addition, we show that determinant and permanent of these hessenberg matrices can be obtained by using combinations. then we show, the ...

In this article we consider the sequences of sample and population covariance operators for a sequence of arrays of Hilbertian random elements. Then under the assumptions that sequences of the covariance operators norm are uniformly bounded and the sequences of the principal component scores are uniformly sumable, we prove that the convergence of the sequences of covariance operators would impl...

background: leishmaniasis is endemic in iran. different species of leishmania (l.) parasites are causative agents of this disease. correct identification of leishmania species is important for clinical studies, prevention, and control of the diseases. mix up of leishmania isolates is possible in the laboratory, so there is need for verification of species for isolates of uncertain identity. dif...

foot-and-mouth disease (fmd) is a major cause of endemic outbreaks in livestock in iran. in this study, clinical field samples of foot-and-mouth disease virus were collected from an outbreak in khorasan razavi province during april and august of 2010, and subjected to indirect sandwich elisa and rt-pcr. the viral serotype circulating during the period was confirmed to be type o. the virus was t...

sergentomyia sintoni is the natural vector of sauroleishmania species of lizards. this sandfly isabundance in and around the burrows of great gerbils. s. sintoni was collected from peridomestic animalshelters, inside and around houses and also from the nearby burrows of the gerbil reservoir hosts,rhombomys opimus, in several provinces of iran. mitochondrial cytochrome b (cyt b) of sandflies, wh...

the set of all non-increasing non-negative integer sequences $pi=(d_1‎, ‎d_2,ldots,d_n)$ is denoted by $ns_n$‎. ‎a sequence $piin ns_{n}$ is said to be graphic if it is the degree sequence of a simple graph $g$ on $n$ vertices‎, ‎and such a graph $g$ is called a realization of $pi$‎. ‎the set of all graphic sequences in $ns_{n}$ is denoted by $gs_{n}$‎. ‎the complete product split graph on $l‎ ...