Abstract Modern high-tech composite materials are widely used in various sectors of the economy, particular, railway transport. Among areas application such innovative materials, manufacturing contact strips for pantographs electric rolling stock should be mentioned. Innovation is primarily understood as self-lubricating property working surface linings. The linings made differ from traditional...

Background: Worldwide Intra-Uterine Growth Restriction carries out high rate of fetal and neonatal morbidity and mortality. Perinatal mortality rates are 4-8 times higher for growth-retarded infants. IUGR are subdivided into symmetrical and asymmetrical subtypes. Aim of Study: To focus on the actual incidence of each subtype of IUGR and disparities. Methods: Across-sectional descriptive study a...

Abstract Due to the increased integration of functions, many components have meet high and sometimes contradictory requirements. One way solve this problem is Tailored Forming. Here, hybrid semi-finished products are manufactured by a joining or cladding process, which then hot-formed finished. For design for possible later industrial application, knowledge about properties required. In paper i...

The mechanical response of magnesium alloy AZ31B is addressed thanks to four-point bending tests. These alloys are known have an asymmetrical behavior in tension-compression. test is, therefore, a good candidate analyze this effect because it combines the two solicitations. Digital image correlation used measure evolution strain fields during test. Measurements shift neutral line (zero strain) ...

This paper aims to improve the mechanical properties and fatigue life of AISI/SAE 4140 alloy steel connecting rods (CRs). Conventional CRs are typically manufactured through open die forging/hammering, blocking, hot forging processes. In present work, a modification process route has been proposed such that forging/hammering was completely replaced with multistep asymmetrical reducer rolling te...

The three approaches to too-many-solutions problems discussed in the previous chapter do not treat them as symptomatic of significant generalizations about input-output mappings rather than outputs. Because this systematic challenge to OT is not recognized, previous attacks on these problems, apart from de Lacy's general proposal, see them as an assortment of individual difficult cases and anal...

there is a complicated relation between cold flat rolling parameters such as effective input parameters of cold rolling, output cold rolling force and exit thickness of strips. in many mathematical models, the effect of some cold rolling parameters has been ignored and the outputs have not a desirable accuracy. in the other hand, there is a special relation among input thickness of strips, the ...

This study investigated the comparative effects of audio-visually prompted collaborative dialogue on the listening comprehension development of symmetrical, asymmetrical, and asymmetrical teacher-fronted EFL learner groups. Besides, it explored the attitude of the participants of the groups concerning the effectiveness of collaborative dialogue for their listening comprehension improvement. The...