in this paper, we introduce a class of $j$-quasipolar rings. let $r$ be a ring with identity. an element $a$ of a ring $r$ is called {it weakly $j$-quasipolar} if there exists $p^2 = pin comm^2(a)$ such that $a + p$ or $a-p$ are contained in $j(r)$ and the ring $r$ is called {it weakly $j$-quasipolar} if every element of $r$ is weakly $j$-quasipolar. we give many characterizations and investiga...

in this paper, we investigate various kinds of extensions of twin-good rings. moreover, we prove that every element of an abelian neat ring r is twin-good if and only if r has no factor ring isomorphic to z2  or z3. the main result of [24] states some conditions that any right self-injective ring r is twin-good. we extend this result to any regular baer ring r by proving that every element of a...

In this study, the effect of cold rolling process on the microstructure and texture evolution in 1wt. % Si non-oriented electrical steel was investigated. For this purpose, all samples were processed through single-stage hot rolling at 1100 ° C and two-stage cold rolling (cross rolling and unidirectional rolling) with intermediate annealing at 650 °C for 35 seconds. Finally, all of them were fu...

Abstract Grinding robot is used in building construction to replace manual grinding of concrete components. Bearing system under high-speed conditions has friction violently with the inner and outer ring, generates a lot heat. This will cause thermal failure system. In order explore characteristics rolling bearings, numerical analysis model based on bearing heat transfer mechanism was establish...

Aiming at the fault diagnosis of rolling element bearings, propose a method for fine bearings based on wavelet transform and one-dimensional convolutional neural network. First use to decompose experimental data; Use resulting low-frequency signal as network input, bearing identification. The experiment uses deep groove ball Case Western Reserve University research object, this identify normal ...

Cold rolling process of a major transformation in the form of sheet metal and a wide range of steel products are produced in this way. Elastic deformation during cold rolling working rollers and the inevitable increase in the rolling force. In this study, the effect of elastic deformation during cold rolling mill rollers working on the reciprocating back and forth in tandem with the presence of...

Abstract The migration and distribution of lubricant oil in a rolling bearing strongly affect the elastohydrodynamic lubrication performance between balls rings. However, re-lubrication is highly dependent on design, which different from ball-on-disc model. This study directly observed film custom-made model-bearing rig, with an outer ring replaced by glass to allow full optical access. influen...