applications as a primary energy carrier. significant advances have been made in the use of hydrogen as a transportation fuel and a fuel for power generation. hydrogen can be used in an internal combustion engine or a fuel cell to generate power. fuel cells have the advantage of significant efficiency...
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calculator sun's position to high accuracy solar radiation on a tilted surface arbitrary orientation and tilt . solar radiation data calculation of solar insolation measurement of solar radiation analysis of solar irradiance data sets typical meteorological year data (tmy) making use of tmy data average...
most vertebrate taxa naturally produce testosterone (zysline et al. ). as hormones, androgens are secreted by cells in one part of a vertebrate (such as the testes) and travel to and coordinate the activities ofcells in different parts of the body, providing a value to the whole organism. they reflect...
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of protein per kilogram of body weight per day; children may require two to three times this amount. human proteins consist of up to different amino acids, of which (called essential amino acids) must be supplied by food protein; the other are synthesized by human cells. complete protein sources—those...
an esophageal adenocarcinoma prominent symptoms usually do not appear until the cancer has infiltrated over % of the circumference of the esophageal tube, by which time the tumor is already in an advanced stage . [ ] onset of symptoms is usually caused by narrowing of the tube due to the physical presence...