Publications by authors named "Guy Stephens"

The performance and lifespan of cutting tools are significantly influenced by their surface quality. The present report highlights recent advances in enhancing the surface characteristics of tungsten carbide and high-speed steel cutting tools using a novel micro-machining technique for polishing and edge-honing. Notably, the main aim was to reduce the surface roughness while maintaining the hardness of the materials at an optimal level.

View Article and Find Full Text PDF
Article Synopsis
  • Cardiac stimulation from sympathetic neurons can lead to arrhythmias, which are irregular heartbeats.
  • The study uses advanced techniques like optogenetics and all-optical electrophysiology to explore how these neurons interact with heart cells (cardiomyocytes) and affect heart activity.
  • Findings reveal that neuronal activity can either stabilize or destabilize heart rhythms, providing insights into the inconsistent results observed in previous research on heart conditions.
View Article and Find Full Text PDF

Background: Tension-type headache (TTH) affects about 1 person in 5 worldwide. It is divided into infrequent episodic TTH (fewer than one headache per month), frequent episodic TTH (two to 14 headaches per month), and chronic TTH (15 headache days a month or more). Paracetamol (acetaminophen) is one of a number of analgesics suggested for acute treatment of headaches in frequent episodic TTH.

View Article and Find Full Text PDF

Purpose: The aim of the study was to assess the influence of interimplant divergence on retention of two Locator attachments before and after in vitro simulation of 3 to 5 years of use.

Materials And Methods: A hydraulic universal testing machine was used to measure the retention of two blue Locator attachments during 5500 seating and unseating cycles. Ten pairs of Locators were tested with interimplant divergences of 0°, 10°, and 20°.

View Article and Find Full Text PDF