BACKGROUND Jaw-thrust is a noxious stimulus that might induce sympathetic responses. The purpose of this study, was to evaluate the effects of jaw-thrust on sympathetic responses. METHODS We investigated seventy three patients. Patients who received general anesthesia were randomly divided into a control group (maintenance of combined airway maneuver with head tilt, open mouth by mouthpiece, ...

Carbon fiber-reinforced plastics (CFRPs) have been specially developed to enhance the performance of commercial and military aircraft because their strength, high stiffness-to-density ratios, superior physical properties. On other hand, fasteners joints CFRP materials may be weak due occurring surface roughness delamination problems during drilling operations. This study’s aim is investigate ch...

Natural fiber composites are a group of materials that have gained increasing attention in recent years due to their potential replace traditional various applications. However composite made up layers fibers and resin can separate from each other during drilling, leading delamination. This paper proposes multi-objective optimization approach for drilling natural composites, considering three k...

A new modified Johnson-Cook model is developed to capture the non-linear thermal softening behaviour below austenite transformation temperature (723°C) in C45 ferritic-pearlitic steel, which not captured by original (JC) model. The physical mechanisms responsible for this are also studied. experimental quasi-static and high strain rate axisymmetric compression testing from 20°C 720°C implemente...

In this paper particle swarm optimization (PSO) is used for a design optimization of a linear permanent magnet synchronous motor (LPMSM) considering ultra low thrust force ripples, low magnet consumption, improved efficiency and thrust. The influence of PM material is discussed, too and the modular poles are proposed to achieve the best characteristic. PM dimensions and material, air gap and mo...

We report on the development of a nano-Newton thrust-stand that can measure up to 100 μN thrust from different types of microthrusters with 10 nN resolution. The compact thrust-stand measures the impingement force of the particles emitted from a microthruster onto a suspended plate of size 45 mm × 45 mm and with a natural frequency over 50 Hz. Using a homodyne (lock-in) readout provides strong ...