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INS Jamuna (J16)
INS ''Jamuna'' (J16) is a hydrographic survey ship in the Indian Navy, under the Southern Naval Command. ''Jamuna'' is equipped with a helicopter, a Bofors 40 mm gun, four survey motor boats, and two small boats. The ship has the distinction of being associated with relief work in the wake of the Gujarat earthquake, Tsunami 2004, as well as Operation Vijay during the Kargil war. ''Jamuna'' was also awarded a Mention in Dispatches. Ship history Built by Goa Shipyard Limited and commissioned into the Naval service at Kochi in 1991, ''Jamuna'' is the Indian Navy's third hydrographic survey ship of the s to have been indigenously designed and constructed. The ship is the namesake of , a sloop, which served in the Royal Indian Navy (RIN) during World War II. The new ''Jamuna'' is equipped with a range of surveying, navigational and communication systems. The next-generation surveying systems provided onboard include the multi-beam swath echo sounding system, differenti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamuna River
The Yamuna ( Hindustani: ), also spelt Jumna, is the second-largest tributary river of the Ganges by discharge and the longest tributary in India. Originating from the Yamunotri Glacier at a height of about on the southwestern slopes of Bandarpunch peaks of the Lower Himalaya in Uttarakhand, it travels a total length of and has a drainage system of , 40.2% of the entire Ganges Basin. It merges with the Ganges at Triveni Sangam, Allahabad, which is a site of the Kumbh Mela, a Hindu festival held every 12 years. Like the Ganges, the Yamuna is highly venerated in Hinduism and worshipped as the goddess Yamuna. In Hinduism she is the daughter of the sun god, Surya, and the sister of Yama, the god of death, and so is also known as Yami. According to popular legends, bathing in its sacred waters frees one from the torments of death. It crosses several states: Haryana and Uttar Pradesh, passing by Uttarakhand and later Delhi, and meeting its tributaries on the way, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kargil War
The Kargil War, also known as the Kargil conflict, was fought between India and Pakistan from May to July 1999 in the Kargil district of Jammu and Kashmir and elsewhere along the Line of Control (LoC). In India, the conflict is also referred to as Operation Vijay ( hi, विजय, ), which was the codename of the Indian military operation in the region. The role of the Indian Air Force in acting jointly with the Indian Army was aimed at flushing out both the Pakistan Army and paramilitary troops from vacated Indian positions along the LoC,http://>.nic.in/content/op-safed-sagar in what was designated as Operation Safed Sagar ( hi, ऑपरेशन सफेद सागर, label=none, ). The conflict was triggered by the infiltration of Pakistani troops—disguised as Kashmiri militants—into strategic positions on the Indian side of the LoC, which serves as the ''de facto'' border between the two countries in the disputed region of Kashmir. During its initial stages ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravimeter
Gravimetry is the measurement of the strength of a gravitational field. Gravimetry may be used when either the magnitude of a gravitational field or the properties of matter responsible for its creation are of interest. Units of measurement Gravity is usually measured in units of acceleration. In the SI system of units, the standard unit of acceleration is 1 metre per second squared (abbreviated as m/s2). Other units include the cgs gal (sometimes known as a ''galileo'', in either case with symbol Gal), which equals 1 centimetre per second squared, and the '' g'' (''g''n), equal to 9.80665 m/s2. The value of the ''g''n is defined approximately equal to the acceleration due to gravity at the Earth's surface (although the value of ''g'' varies by location). Gravimeters An instrument used to measure gravity is known as a gravimeter. For a small body, general relativity predicts gravitational effects indistinguishable from the effects of acceleration by the equivalence pri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motion Sensors
Motion detection is the process of detecting a change in the position of an object relative to its surroundings or a change in the surroundings relative to an object. It can be achieved by either mechanical or electronic methods. When it is done by natural organisms, it is called motion perception. Methods Motion can be detected by monitoring changes in: *Infrared light (passive and active sensors) *Visible light (video and camera systems) *Radio frequency energy (radar, microwave and tomographic motion detection) *Sound (microphones, other acoustic sensors) *Kinetic energy (triboelectric, seismic, and inertia-switch sensors) *Magnetism (magnetic sensors, magnetometers) *Wi-Fi Signals (WiFi Sensing) Mechanical The most basic forms of mechanical motion detection utilize a switch or trigger. For example, the keys of a typewriter use a mechanical method of detecting motion, where each key is a switch that is either off or on, and each letter that appears is a result of the key' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Echo (phenomenon)
In audio signal processing and acoustics, an echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the listener. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source. The word ''echo'' derives from the Greek ἠχώ (''ēchō''), itself from ἦχος (''ēchos''), "sound". Echo in the Greek folk story is a mountain nymph whose ability to speak was cursed, leaving her able only to repeat the last words spoken to her. Some animals use echo for location sensing and navigation, such as cetaceans (dolphins and whales) and bats in a process known as echolocation. Echoes are also the basis of Sonar technology. Acoustic phenomenon Acoustic waves are reflected by walls or other hard surfaces, such as mountains and pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Communication
Communication (from la, communicare, meaning "to share" or "to be in relation with") is usually defined as the transmission of information. The term may also refer to the message communicated through such transmissions or the field of inquiry studying them. There are many disagreements about its precise definition. John Peters argues that the difficulty of defining communication emerges from the fact that communication is both a Universality (philosophy), universal phenomenon and a Communication studies, specific discipline of institutional academic study. One definitional strategy involves limiting what can be included in the category of communication (for example, requiring a "conscious intent" to persuade). By this logic, one possible definition of communication is the act of developing Semantics, meaning among Subject (philosophy), entities or Organization, groups through the use of sufficiently mutually understood signs, symbols, and Semiosis, semiotic conventions. An im ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigation
Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and direction. In this sense, navigation includes orienteering and pedestrian navigation. History In the European medieval period, navigation was considered part of the set of '' seven mechanical arts'', none of which were used for long voyages across open ocean. Polynesian navigation is probably the earliest form of open-ocean navigation; it was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing military alliances: the Allies and the Axis powers. World War II was a total war that directly involved more than 100 million personnel from more than 30 countries. The major participants in the war threw their entire economic, industrial, and scientific capabilities behind the war effort, blurring the distinction between civilian and military resources. Aircraft played a major role in the conflict, enabling the strategic bombing of population centres and deploying the only two nuclear weapons ever used in war. World War II was by far the deadliest conflict in human history; it resulted in 70 to 85 million fatalities, mostly among civilians. Tens of millions died due to genocides (including the Holocaust), starvation, ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Indian Navy
The Royal Indian Navy (RIN) was the naval force of British India and the Dominion of India. Along with the Presidency armies, later the Indian Army, and from 1932 the Royal Indian Air Force, it was one of the Armed Forces of British India. From its origins in 1612 as the East India Company's Marine, the Navy underwent various changes, including changes to its name. Over time it was named the Bombay Marine (1686), the Bombay Marine Corps (1829), the Indian Navy (1830), Her Majesty's Indian Navy (1858), the Bombay and Bengal Marine (1863), the Indian Defence Force (1871), Her Majesty's Indian Marine (1877) and the Royal Indian Marine (1892). It was finally named the Royal Indian Navy in 1934. However, it remained a relatively small force until the Second World War, when it was greatly expanded. After the partition of India into two independent states in 1947, the Navy was split between Pakistan and India. One-third of the assets and personnel were assigned to Royal Pakistan Nav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sloop-of-war
In the 18th century and most of the 19th, a sloop-of-war in the Royal Navy was a warship with a single gun deck that carried up to eighteen guns. The rating system covered all vessels with 20 guns and above; thus, the term ''sloop-of-war'' encompassed all the unrated combat vessels, including the very small gun-brigs and cutters. In technical terms, even the more specialised bomb vessels and fireships were classed as sloops-of-war, and in practice these were employed in the sloop role when not carrying out their specialised functions. In World War I and World War II, the Royal Navy reused the term "sloop" for specialised convoy-defence vessels, including the of World War I and the highly successful of World War II, with anti-aircraft and anti-submarine capability. They performed similar duties to the American destroyer escort class ships, and also performed similar duties to the smaller corvettes of the Royal Navy. Rigging A sloop-of-war was quite different from a civilian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Namesake
A namesake is a person, geographic location, or other entity bearing the name of another. History The word is first attested around 1635, and probably comes from the phrase "for one's name's sake", which originates in English Bible translations as a rendering of a Hebrew idiom meaning "to protect one's reputation" or possibly "vouched for by one's reputation." A familiar example which schoolchildren used to learn by heart is in Psalm 23:3, "he leadeth me in the paths of righteousness for his name's sake" (King James Bible, 1604), or in the metrical version "e’en for his own name’s sake" (Rous 1641, Scottish Psalter 1650, see The Lord's My Shepherd). Proper usage When ''namesake'' refers to something or someone who is named after something or someone else, the second recipient of a name is usually said to be the ''namesake'' of the first. This usage usually refers to humans named after other humans, but current usage also allows things to be or have namesakes. Sometimes the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
