BACKGROUND Acne scarring is common but surprisingly difficult to treat. Newer techniques and modifications to older ones may make this refractory problem more manageable. The 100% trichloroacetic acid (TCA) chemical reconstruction of skin scars (CROSS) method is a safe and effective single modality for the treatment of atrophic acne scars, whereas subcision appears to be a safe technique that p...

Interest in vibration control in systems employing rolling element bearings, ranging from rotor systems used in energy conversion/transmission to high-precision, multi-degree-offreedom optical positioning systems, has focused attention on the modelling of bearing dynamic stiffness properties. While modelling a rolling element bearing either as an ideal boundary condition for a shaft or as a sim...

In this study, the effects of nitrogen addition on the production of ultrafine/nano grained AISI 201L stainless steel by advanced thermo-mechanical process were investigated. Cast samples were first homogenized at 1200 °C for 4 h, hot-rolled at 1100 °C and finally, solution-annealed at 1150 °C for 2.5 h. Unidirectional and cross multipass cold rolling at 25 °C was carried out to 90% reduction i...

In order to optimize the continuous rolling schedule for improving the quality of rolled tube billet, three dimensional thermal mechanical coupled finite element simulation is applied to analyse the multi-pass continuous rolling process of Ф100mm 37Mn5 steel tube billet from 200mm×200mm square cast bloom. Due to the larger plastic strain occurring at the corner area of the billet, the bias mesh...

1 College of Materials Science and Engineering, Nanjing Forestry University, 159 6 Longpan Road, Nanjing, Jiangsu, China 210037. 7 2 Faculty of Forestry and Environmental Management, University of New 8 Brunswick, 28 Dineen Drive, Fredericton, New Brunswick, Canada E3B 5A3. 9 * Corresponding author: [email protected] 10 Received: July 08, 2017 11 Accepted: March 02, 2018 12 Posted online: March 06...

This paper suggests a nonlinear control law to stabilize the rolling motion of missiles. Based on the analysis of rolling moment characteristics due to pitch/yaw control cross-coupling, we propose a conjecture that the moment is described by the bilinear form of pitch/yaw acceleration and yaw/pitch control. The conjecture fits a set of wind tunnel test data and leads to a bilinear control law. ...