The thermodynamic cycle of the basic combined cycle consists of two power plant cycles. One is the Joule or Brayton cycle which is a gas turbine cycle and the other is the Rankine cycle which is a steam turbine cycle. The cycle 1-2-3-4-1 which is the gas turbine power plant cycle is the topping cycle. It depicts the heat and work transfer process taking place in the high …

An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices.. When a battery is supplying power, its positive terminal is the cathode and its negative terminal is the anode. The terminal marked negative is the source of electrons that will flow through an external electric circuit to the …

The natural rate of unemployment is the name that was given to a key concept in the study of economic activity. Milton Friedman and Edmund Phelps, tackling this 'human' problem in the 1960s, both received the Nobel Memorial Prize in Economic Sciences for their work, and the development of the concept is cited as a main motivation behind the prize. A simplistic …

The biosphere (from Greek βίος bíos "life" and σφαῖρα sphaira "sphere"), also known as the ecosphere (from Greek οἶκος oîkos "environment" and σφαῖρα), is the worldwide sum of all ecosystems.It can also be termed the zone of life on Earth.The biosphere (which is technically a spherical shell) is virtually a closed system with regard to matter, with minimal inputs and …

Formal theory. Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces. The empty string is the special case where the sequence has length zero, so there are no symbols in the string.

Shepseskaf was a pharaoh of ancient Egypt who reigned in the late 26th to the mid–25th century BC. He was the sixth and probably last ruler of the fourth dynasty during the Old Kingdom period. His name means "His soul is noble". Shepseskaf might have been the son or possibly the brother of his predecessor Menkaure.During his reign of four to seven years, Shepseskaf completed …

An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well.Aquifers vary greatly in their characteristics. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology.Related terms include aquitard, which is …

The Oil and Natural Gas Corporation (ONGC) is a central public sector undertaking under the ownership of Ministry of Petroleum and Natural Gas, Government of India.It is headquartered in New Delhi.ONGC was founded on 14 August 1956 by the Government of India.It is a central public sector undertaking whose operations are overseen by the Ministry of Petroleum and …

Hubbert assumed that after fossil fuel reserves (oil reserves, coal reserves, and natural gas reserves) are discovered, production at first increases approximately exponentially, as more extraction commences and more efficient facilities are installed. At some point, a peak output is reached, and production begins declining until it approximates an exponential decline. ...

Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity". A variety of definitions have been used for different purposes over time. Health can be promoted by encouraging healthful activities, such as regular physical exercise and adequate sleep, and by reducing or …