The year-old has been absent from the show for the past six weeks but no explanation has been provided for viewers until now. Although the stroke was not a serious one — Don was well enough to visit the Chelsea Flower Show on Monday — he has decided to leave the BBC2 programme permanently in order to concentrate on his recovery. Don was the main presenter of the show and was much-loved by the audience, many of whom have commented on his absence in recent weeks on gardening forums. Monty Don returns to BBC. Monty has presented the series for the past five years but has been off our screens for the past six weeks as a result of a minor stroke.
Not only does the overall size of the engine matter, but the aspect ratio of the engine cylinders—defined by the stroke-to-bore ratio—also matters. To explain why, one must consider three factors: in-cylinder heat transfer, cylinder scavenging and friction. Simple geometric relationships show that an engine cylinder with longer stroke-to-bore ratio will have a smaller surface area exposed to the combustion chamber gasses compared to a cylinder with shorter stroke-to-bore ratio. The smaller area leads directly to reduced in-cylinder heat transfer, increased energy transfer to the crankshaft and, therefore, higher efficiency. Cylinder scavenging—a two-stroke phenomenon in which the exhaust products in the cylinder are replaced by fresh air—is also strongly affected by the stroke-to-bore ratio in a uniflow-scavenging, opposed-piston, two-stroke engine. As the stroke-to-bore ratio increases, so does the distance the fresh air has to travel between the intake ports at one end of the cylinder and the exhaust ports at the other end. This increased distance results in higher scavenging efficiency and, as a result, lower pumping work because less fresh air is lost via charge short circuiting.
These are external links and will open in a new window. When Mollie Docherty woke up one Sunday morning feeling "a bit rough" after a night with friends, she didn't think it was anything out of the ordinary. I collapsed to the floor in the hallway.
These are external links and will open in a new window. Oscar-nominated director John Singleton - known for films including Boyz N the Hood and his remake of detective movie Shaft - is in intensive care after suffering a stroke. Born in Los Angeles, Singleton acted as a trailblazer for African-American directors throughout the s. It also marked the film debut for rapper Ice Cube.