The radar has many peaceful uses. To help navigation at sea, small radars are installed on small commercial vessels, and larger ones are used on ocean-going liners and transports. Aboard aircraft a radar is used to make air navigation and flight safe, and to map areas over which the plane is flying. A ground-based radar is employed to control flights of aircraft. In detecting a storm, a radar can locate heavy clouds associated with various weather disturbances. Whatever the application, the basic principles of all types of radar equipment are deeply rooted in radio and electronics. A radar is a composite radio-electronic apparatus to be used for detecting and locating objects and targets, such as aircraft, ships, buildings, mountains, and even people at various distances and with incredible accuracy, even when darkness, fog or clouds make the targets invisible. A radar consists essentially of a microwave transmitter and antenna system, a microwave receiver, a timer or synchronizer and an indicator – all working with microsecond precision. Radio energy is broadcast in any desired direction. In striking an object or target, a minute portion of the radio energy is reflected and returns to the radar within a few thousandths of a second. Knowing the speed of radio energy (186,000 miles per second) and measuring time differences between the transmitted energy and any reflected echoes, it is possible to translate these data electronically into the direct distance or range – from the radar to each object or target. Determining the exact location of any target is made possible through accurate measurements of range, altitude, and azimuth, whether the target is in space, on the ground or on the sea. The data obtained (directly or through electronic processing) are displayed continuously on an indicator. This is usually a cathode-ray tube, the type of which is dependent on the kind of data to be displayed – range, altitude, azimuth, or others.
A) Household is a group of people who make economic decisions together. In economic theory households have two roles: they enter the market as buyers or consumers of goods and services produced by firms and they provide for factor inputs to firms in order to produce those goods and services. The term household" is used in national income analysis, supply and demand analysis it is replaced by the term "consumer". 6) Black economy is nonmarket economic activity which is not included in. the national income accounts, either because such activity does not pass through the market or because it is illegal. Illegal economic activity may exist in the usual price system which is determined by demand and supply. Examples may be the purchase and sale of illegal drugs in the street, or alcohol during the US prohibition era of the 1920s. However, some nonmarket activity is carried out for non-profit-making purposes. For example, a housewife provides services for her family. Other nonmarket activity is done on a barter basis, for example, while a mechanic serves a motor car of an electrician who in return helps the mechanic install light fittings in the house where there has been no money paid, the activity does not add to the GDP and so does not exist for statistics.
Aboard aircraft a radar is used to make air navigation and flight safe, and to map areas over which the plane is flying. A ground-based radar is employed to control flights of aircraft.
In detecting a storm, a radar can locate heavy clouds associated with various weather disturbances.
Whatever the application, the basic principles of all types of radar equipment are deeply rooted in radio and electronics.
A radar is a composite radio-electronic apparatus to be used for detecting and locating objects and targets, such as aircraft, ships, buildings, mountains, and even people at various distances and with incredible accuracy, even when darkness, fog or clouds make the targets invisible.
A radar consists essentially of a microwave transmitter and antenna system, a microwave receiver, a timer or synchronizer and an indicator – all working with microsecond precision.
Radio energy is broadcast in any desired direction. In striking an object or target, a minute portion of the radio energy is reflected and returns to the radar within a few thousandths of a second. Knowing the speed of radio energy (186,000 miles per second) and measuring time differences between the transmitted energy and any reflected echoes, it is possible to translate these data electronically into the direct distance or range – from the radar to each object or target.
Determining the exact location of any target is made possible through accurate measurements of range, altitude, and azimuth, whether the target is in space, on the ground or on the sea. The data obtained (directly or through electronic processing) are displayed continuously on an indicator. This is usually a cathode-ray tube, the type of which is dependent on the kind of data to be displayed – range, altitude, azimuth, or others.
6) Black economy is nonmarket economic activity which is not included in. the national income accounts, either because such activity does not pass through the market or because it is illegal. Illegal economic activity may exist in the usual price system which is determined by demand and supply. Examples may be the purchase and sale of illegal drugs in the street, or alcohol during the US prohibition era of the 1920s. However, some nonmarket activity is carried out for non-profit-making purposes.
For example, a housewife provides services for her family. Other nonmarket activity is done on a barter basis, for example, while a mechanic serves a motor car of an electrician who in return helps the mechanic install light fittings in the house where there has been no money paid, the activity does not add to the GDP and so does not exist for statistics.