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the reason for specifying the size of the server is to keep the server in the right size so that it can be placed on an iron or aluminum rack. There is a screw hole on the rack to fix the server. Align it with the screw hole of the server and fix it with screws
the specified dimensions are the width (48.26cm = 19 inches) and height (multiple of 4.445cm) of the server. Because the width is 19 inches, the rack meeting this requirement is sometimes called "19 inch rack"< The basic unit of thickness is 4.445cm. 1U is 4.445cm, 2U is 2 times of 1U, 8.89cm. That is to say, the so-called "1U PC server" is a proct whose appearance meets EIA specification and thickness is 4.445cm. Procts designed to fit into 19 inch cabinets are generally referred to as rack servers
placing the server on the rack is not only concive to daily maintenance and management, but also may avoid unexpected failures. First of all, the server doesn't take up too much space. Rack servers are neatly arranged in the rack without wasting space. Secondly, the connecting line can be neatly retracted and put into the rack. The power line and LAN line can all be laid in the cabinet, which can rece the connection lines piled on the ground, so as to prevent the occurrence of accidents such as kicking off the wires.
Energy is the power source of livestock and poultry to maintain life, growth, reproction and various proction activities. At present, the unit of energy measurement is Joule (J), and in practice, kilojoule (kJ) and megajoule (MJ) are often used to express
1kj = 1000j
1MJ = 1000kj
in the past, Cal was used as the measurement unit of energy, 1 cal was equivalent to the heat required for 1g water to rise from 14.5 ℃ to 15.5 ℃; Kcal, also known as kcal, is 1000 times of kcal; Megacalorie (MCAL) is 1000 times of kilocalorie. Card is a non legal unit of measurement, which is not allowed to be used. The conversion relationship between card and coke is as follows:
1 card (CAL) = 4.181 coke (J)
livestock and poultry must obtain energy from feed to maintain life and proce procts. The organic matter (carbohydrate, fat and protein) in feed can be oxidized in the body of livestock and poultry to proce heat energy for life activities, sports, growth and proction. In these three kinds of organic matter, the more carbon, hydrogen and oxygen content, the more energy proced ring oxidation. Carbohydrate, fat and protein contain different carbon, hydrogen and oxygen, so they proce different energy
