data envelopment analysis (dea) is a technique that uses all collected observations to measure performance. this method presents no data about how to operate on dmu. the present research attempted to study a unit with all its subunits, if the unit is efficient, it means that all its subunits are efficient too and if it is an inefficient, it shows clearly that which one of the subunits makes ine...

OBJECTIVE To study the relationship between bullying behavior and psychopathology. MATERIALS AND METHODS A total of 1 092 students identified their peers' bullying status based on the Bull-S questionnaire. Parents completed the Child Behavior Checklist (CBCL) to determine psychopathology levels. RESULTS The bullying group had associations with anxiety, somatic symptoms, oppositionalism and ...

In this paper we prove that each element of any regular Baer ring is a sum of two units if no factor ring of R is isomorphic to Z_2 and we characterize regular Baer rings with unit sum numbers $omega$ and $infty$. Then as an application, we discuss the unit sum number of some classes of group rings.

BACKGROUND: US immigration policy changes may affect health care use among Latinx children. We hypothesized that January 2017 restrictive executive actions would lead to decreased METHODS: used controlled interrupted time series estimate the effect of on outpatient cancellation or no-show rates from October 2016 March (“immigration action period”) children in 4 systems North Carolina. included ...

the aims of this study were to assess the energy and economic flows of biodiesel production from olive pomace oil using transesterification method with ultrasound waves. for this purpose biodiesel production from this feedstock were examined through a life-cycle process with considering five main stages of agricultural production, transportation, olive oil extraction, pomace oil extraction and ...