For at least over 200 years, multiple controversies have arisen around the timing of umbilical cord clamping. In the past decades, early cord clamping (within the first 15 seconds) had markedly prevailed. Only in the 21st century, randomized controlled trials have demonstrated the benefits of delayed cord clamping (at 2-3 minutes). Delayed cord clamping has been practiced in obstetrics based on...

Abstract To study the effect of thread pitch on bolt loosening behavior with consideration fretting wear, experiments and finite element analysis were carried out to bolts different pitches. The experimental results demonstrate that wear existed surface. It caused a slow without nut rotation. With increases, clamping force will become smaller, so surface also decrease, indicating lager could in...

The purpose of this study was to investigate the effect of aortic clamping on arterial waves during peripheral vascular surgery. We measured pressure and velocity simultaneously in the ascending aorta, in ten patients (70+/-5 years) with aortic-iliac disease intra-operatively. Pressure was measured using a catheter tip manometer, and velocity was measured using Doppler ultrasound. Data were col...

Recently, the American College of Obstetricians & Gynecologists (ACOG) recommended a 30–60 second delay in umbilical cord clamping for all preterm deliveries [1]. Delayed cord clamping in preterm infants has been associated with a greater than 50% reduction in intraventricular hemorrhage and less need for blood transfusions as demonstrated in a recent Cochrane meta-analysis of 10 randomized con...

Improper clamping is one of the major causes part deformation. Improving fixture arrangement through force analysis points an effective means to suppress or improve machining However, existing research focuses on monitoring and off-line optimization point force, which has a certain lag deformation control, it difficult predict due time-varying coupling effect multiple factors such as process pa...

We present a holographic optical tweezers system capable of position clamping multiple particles. Moving an optical trap in response to the trapped object's motion is a powerful technique for optical control and force measurement. We have now realised this experimentally using a Boulder Nonlinear Systems Spatial Light Modulator (SLM) with a refresh rate of 203Hz. We obtain a reduction of 44% in...