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Showing posts from January, 2013

PHYSICS OF SEAM BOWLING

Seam bowling   is a phrase used for a   bowling   technique in   cricket   whereby the ball is deliberately bowled on to its seam, to cause a random deviation. Practitioners are known as   seam   bowlers   or   seamers . Seam bowling is generally classed as a subtype of   fast bowling , although the bowling speeds at which seam can be a factor include medium-pace bowling. Although there are specialist seamers that make deliberate use of   Off cutter   and   Leg cutter   at the expense of bowling slower than regular fast bowlers, most bowlers employ the seam to some effect and so the terms "seamer" and "fast bowler" are largely synonymous. A   cricket ball   is not a perfect   sphere . The seam of the ball is the circular stitching which joins the two halves of the cricket ball. Hence, the seam joining the pieces of leather is circumferential and the stitching is noticeably raised. If the ball is bo...

Scope and Limitations of Utilisation of Non-edible Vegetable Oils as a Substitute Fuel for Diesel Engines

For India, there is a need to take a mission approach to explore the possibility of using straight  unmodified vegetable oils/ their blends with mineral diesel as alternative fuel in order to reduce the pollution and to increase the energy security of the country, especially in rural areas. This aimed at exploring technical feasibility of using straight vegetable oils (Jatropha and Karanja) in direct injection compression ignition engine without major hardware modifications. Since use of unprocessed straight vegetable oils has its own merits, it was decided to examine two most commonly available oils (in unmodified form) in an unmodified constant-speed direct-injection diesel engine typically used in the agricultural sector in India. Study was carried out in two phases for (i) Straight vegetable oils and their higher blend, and (ii) lower blends of vegetable oils. This project is carried out at Engine Research Laboratory, Indian Institute of Technology Kanpur..........................

Various Types Of CRANES

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A crane is a tower or derrick that is equipped with cables and pulleys that are used to lift and lower material. They are commonly used in the construction industry and in the manufacturing of heavy equipment. Cranes for construction are normally temporary structures  either fixed to the ground or mounted on a purpose built vehicle.They can either be controlled from an operator in a cab that travels along with the crane, by a push button pendant control station, or by radio type controls. The crane operator is ultimately responsible for the safety of the crews and the crane. Mobile Cranes The most basic type of crane consists of a steel truss or telescopic boom mounted on a mobile platform, which could be a rail, wheeled, or even on a cat truck. The boom is hinged at the bottom and can be either raised or lowered by cables or hydraulic cylinders. Telescopic Crane This type of crane offers a boom that consists of a number of tubes fitted ...