Volleyball is a very popular sport with an estimated 800 million participants worldwide. The game involves many physical skills and successful performance is highly related with an individual’s ability to propel themselves into the air during both offensive and defensive maneuvers. These ballistic activities often result in the creation of ground reaction forces on the order of five times body ...

“Sex survey ruined our wedding,” screamed the front page of the Sun. The newspaper reported how a “couple had a furious row and called off their wedding after the bride-to-be revealed their sex secrets in a university survey.” This could be a routine example of how the press uses research on sex to sell papers. This case is more interesting, however, because the groom to be was clearly unhappy ...

Abstract The process of smooth plowing with the turnover layers within its own furrow is characterized by high energy costs due to interaction plow body and in conditions blocked cutting. purpose research substantiate type second-rear frontal plow. proposed front for contains twin screw housings, first-row colliders, rear right- left-turning second-row colliders. Screw housings are equipped mir...

Strip-till technology was formed in the USA on a short corn-soybean crop rotation. Both crops are harvested September-October and thereby exclude appearance of post-harvest weeds. In addition, both grown wide-row crops, this prompted emergence strip cultivation technology. is an alternative tillage option between traditional plowing direct seeding. When applying technology, soil deeply loosened...

Corn harvester row alignment is a critical factor to improve harvesting quality and reduce cob drop loss. In this paper, corn automatic system designed with self-propelled combine harvester, incorporating front-end touch mechanism of the cutting table steering control system. stalk lateral deviation from reference during detected by touch-row that serves as an input The consists Hirschmann PLC ...

stand establishment in crusting soil is one of the main concerns in the production of crops with delicate seedlings such as cotton, onions and rape seed. crust breaking, maintaining soil moisture and adding chemical and organic amendments to soil are different methods to weaken soil strength and allow the shoots to emerge. these methods are not always successful because they depend on factors s...

osteoporosis is the most common metabolic bone disease. in addition to morbidity, osteoporotic fractures also increase mortality risk in affected patients. enough evidence is not available to indicate that, like western countries, osteoporosis is a public health problem in iran. therefore emrc planned to estimate the burden of osteoporotic fractures in year 2001 based on existing sources of dat...