Our aim is to study the set of K-rational expressions describing rational series. More precisely we are concerned with the definition of quotients of this set by coarser and coarser congruences which lead to an extension – in the case of multiplicities – of some classical results stated in the Boolean case. In particular, multiplicity analogues of the well known theorems of Brzozowski and Antim...

In 2014, Zead Mustafa introduced $b_2$-metric spaces, as a generalization of both $2$-metric and $b$-metric spaces. Then new fixed point results for the classes of  rational Geraghty contractive mappings of type I,II and III in the setup of $b_2$-metric spaces are investigated. Then, we prove some fixed point theorems under various contractive conditions in partially ordered $b_2$-metric spaces...

in this paper we define weak $f$-contractions on a‎ ‎metric space into itself by extending $f$-contractions‎ ‎introduced by d‎. ‎wardowski (2012) and provide some fixed point‎ ‎results in complete metric spaces and in partially ordered complete ‎generalized metric spaces‎. ‎some relationships between weak‎ ‎$f$-contractions and $fi$-contractions are highlighted‎. ‎we also ‎give some application...

Black pepper ( Piper nigrum ) from Piperaceae and its main ingredient (piperine) reduces gastric emptying in rats. In Iranian traditional medicine, black pepper is used to relief the menorrhalgia in women. The aim of this study was to investigate the effect of black pepper fruit aqueous extract on non-pregnant rat uterus contractions and the mechanism(s) of its action. To prepare the extract, b...

‎in this paper‎, ‎generalized convex contractions on orthogonal metric spaces are stablished in whath might be called their definitive versions‎. ‎also, we show that‎ there are examples which show that our main theorems are genuine generalizations of theorem 3.1 and 3.2 of cite{r}‎[ m.a. miandaragh, m. postolache, s. rezapour, ‎textit{approximate fixed points of generalizedconvex contractions},...

background: dystocia is the most common indication of primary cesarean section. the most common cause of dystocia is uterine dysfunction. in prolonged labor, more attention is usually paid to the fetus and pelvis rather than to the role of uterine contractions in a delivery. therefore, we decided to determine the relationship between the labor progress and uterine contractions shapes . methods:...

Aims: In preterm delivery, uterine contractions begin prematurely and lead to the opening of the cervix. Nifedipine and Indomethacin drugs can help reduce contractions and delay childbirth.  However, there are contradictions regarding their effect on preterm birth and inflammatory factors. . The purpose of this study is to compare the effects of nifedipine and indomethacin on the uterine contra...

background: pregnancy rate with ivf cycle is almost 22%. many investigations perform to increase this rate in ivf. various factors affect the result of ivf cycles. one of these factors could be uterine contractions that expel transferred embryo. ritodrine is a beta mimetic agent that can block and decrease uterine contractions. objective: the objective of this study was to determine ritodrine e...