Logo
Unionpedia
Communication
Get it on Google Play
New! Download Unionpedia on your Android™ device!
Free
Faster access than browser!
 

Underwater acoustics

Index Underwater acoustics

Underwater acoustics is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water and its boundaries. [1]

128 relations: A-weighting, Absolute threshold of hearing, Acoustic impedance, Acoustic release, Acoustic tag, Acoustical oceanography, Albert Beaumont Wood, Alpheidae, Ambient noise level, Annales de chimie et de physique, Astroparticle Physics (journal), Audiogram, Autonomous underwater vehicle, Bandwidth (signal processing), Beamforming, Bioacoustics, Biome, Blue whale, Boric acid, Center frequency, Centre for Maritime Research and Experimentation, Cetacea, Cold War, Decade (log scale), Decibel, Deep sea, Diversity scheme, Dolphin, Doppler effect, Ear, Echo sounding, Equator, Euclidean vector, European Conference on Underwater Acoustics, Explosive material, Fin whale, Fish, France, Fred Tappert, Fresh water, Hertz, Hydroacoustics, Hydrophone, Iceberg, Intensity (physics), Jacques Charles François Sturm, Jean-Daniel Colladon, Johnson–Nyquist noise, Journal of the Acoustical Society of America, Killer whale, ..., Kilometre, Knot (unit), Lake Geneva, Latitude, Leonardo da Vinci, Lobster, Low frequency, Magnesium sulfate, Mathematician, Mechanical wave, Microphone, Millionth, Nature (journal), Naval mine, Neutrino, Noise (electronics), Ocean acoustic tomography, Ocean Tracking Network, Octave, Pascal (unit), Paul Langevin, Physical acoustics, Physicist, Piezoelectricity, Plankton, Plume (fluid dynamics), Precipitation, Pressure, Propagation loss, Radar, Rain gauge, Refraction (sound), Reginald Fessenden, Remotely operated underwater vehicle, Reverberation, RMS Titanic, Root mean square, Salinity, Scalar (mathematics), Scarlet wrasse, Seawater, Seismic source, Seismology, Side-scan sonar, Signal processing, SOFAR channel, Sonar, Sonoluminescence, Sound, Sound intensity, Sound pressure, Sound speed gradient, Spectral density, Speed of sound, Sperm whale, Submarine, Submersible, Swiss people, Target strength, Telecommunication, Telemetry, Temperate climate, Temperature, Thermocline, Tonality, Toothed whale, Transducer, Turbulence, U-boat, Underwater acoustic communication, Underwater acoustic positioning system, Viscosity, Water, Water tank, Wind, Woods Hole Oceanographic Institution, World War I, World War II. Expand index (78 more) »

A-weighting

A-weighting is the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level.

New!!: Underwater acoustics and A-weighting · See more »

Absolute threshold of hearing

The absolute threshold of hearing (ATH) is the minimum sound level of a pure tone that an average human ear with normal hearing can hear with no other sound present.

New!!: Underwater acoustics and Absolute threshold of hearing · See more »

Acoustic impedance

Acoustic impedance and specific acoustic impedance are measures of the opposition that a system presents to the acoustic flow resulting of an acoustic pressure applied to the system.

New!!: Underwater acoustics and Acoustic impedance · See more »

Acoustic release

An acoustic release is an oceanographic device for the deployment and subsequent recovery of instrumentation from the sea floor, in which the recovery is triggered remotely by an acoustic command signal.

New!!: Underwater acoustics and Acoustic release · See more »

Acoustic tag

Acoustic tags are small sound-emitting devices that allow the detection and/or remote tracking of fish in three dimensions for fisheries research.

New!!: Underwater acoustics and Acoustic tag · See more »

Acoustical oceanography

Acoustical oceanography is the use of underwater sound to study the sea, its boundaries and its contents.

New!!: Underwater acoustics and Acoustical oceanography · See more »

Albert Beaumont Wood

Albert Beaumont Wood DSc (1890 – 19 July 1964), better known as A B Wood, was a British physicist, known for his pioneering work in the field of underwater acoustics and sonar.

New!!: Underwater acoustics and Albert Beaumont Wood · See more »

Alpheidae

Alpheidae is a family of caridean snapping shrimp characterized by having asymmetrical claws, the larger of which is typically capable of producing a loud snapping sound.

New!!: Underwater acoustics and Alpheidae · See more »

Ambient noise level

In atmospheric sounding and noise pollution, ambient noise level (sometimes called background noise level, reference sound level, or room noise level) is the background sound pressure level at a given location, normally specified as a reference level to study a new intrusive sound source.

New!!: Underwater acoustics and Ambient noise level · See more »

Annales de chimie et de physique

Annales de chimie et de physique (French for Annals of Chemistry and of Physics) is a scientific journal that was founded in Paris, France, in 1789 under the title Annales de chimie.

New!!: Underwater acoustics and Annales de chimie et de physique · See more »

Astroparticle Physics (journal)

Astroparticle Physics is a peer-reviewed scientific journal covering experimental and theoretical research in the interacting fields of cosmic ray physics, astronomy and astrophysics, cosmology, and particle physics.

New!!: Underwater acoustics and Astroparticle Physics (journal) · See more »

Audiogram

An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer.

New!!: Underwater acoustics and Audiogram · See more »

Autonomous underwater vehicle

An autonomous underwater vehicle (AUV) is a robot that travels underwater without requiring input from an operator.

New!!: Underwater acoustics and Autonomous underwater vehicle · See more »

Bandwidth (signal processing)

Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.

New!!: Underwater acoustics and Bandwidth (signal processing) · See more »

Beamforming

Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception.

New!!: Underwater acoustics and Beamforming · See more »

Bioacoustics

Bioacoustics is a cross-disciplinary science that combines biology and acoustics.

New!!: Underwater acoustics and Bioacoustics · See more »

Biome

A biome is a community of plants and animals that have common characteristics for the environment they exist in.

New!!: Underwater acoustics and Biome · See more »

Blue whale

The blue whale (Balaenoptera musculus) is a marine mammal belonging to the baleen whale parvorder, Mysticeti.

New!!: Underwater acoustics and Blue whale · See more »

Boric acid

Boric acid, also called hydrogen borate, boracic acid, orthoboric acid and acidum boricum, is a weak, monobasic Lewis acid of boron, which is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds.

New!!: Underwater acoustics and Boric acid · See more »

Center frequency

In electrical engineering and telecommunications, the center frequency of a filter or channel is a measure of a central frequency between the upper and lower cutoff frequencies.

New!!: Underwater acoustics and Center frequency · See more »

Centre for Maritime Research and Experimentation

Previously known as NATO Undersea Research Centre (NURC), the Centre for Maritime Research and Experimentation (CMRE) is a scientific research and experimentation NATO facility that organizes and conducts scientific research and technology development, centered on the maritime domain, to address defense and security needs of the Alliance.

New!!: Underwater acoustics and Centre for Maritime Research and Experimentation · See more »

Cetacea

Cetacea are a widely distributed and diverse clade of aquatic mammals that today consists of the whales, dolphins, and porpoises.

New!!: Underwater acoustics and Cetacea · See more »

Cold War

The Cold War was a state of geopolitical tension after World War II between powers in the Eastern Bloc (the Soviet Union and its satellite states) and powers in the Western Bloc (the United States, its NATO allies and others).

New!!: Underwater acoustics and Cold War · See more »

Decade (log scale)

One decade (symbol dec) is a unit for measuring frequency ratios on a logarithmic scale, with one decade corresponding to a ratio of 10 between two frequencies (an order of magnitude difference).

New!!: Underwater acoustics and Decade (log scale) · See more »

Decibel

The decibel (symbol: dB) is a unit of measurement used to express the ratio of one value of a physical property to another on a logarithmic scale.

New!!: Underwater acoustics and Decibel · See more »

Deep sea

The deep sea or deep layer is the lowest layer in the ocean, existing below the thermocline and above the seabed, at a depth of 1000 fathoms (1800 m) or more.

New!!: Underwater acoustics and Deep sea · See more »

Diversity scheme

In telecommunications, a diversity scheme refers to a method for improving the reliability of a message signal by using two or more communication channels with different characteristics.

New!!: Underwater acoustics and Diversity scheme · See more »

Dolphin

Dolphins are a widely distributed and diverse group of aquatic mammals.

New!!: Underwater acoustics and Dolphin · See more »

Doppler effect

The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.

New!!: Underwater acoustics and Doppler effect · See more »

Ear

The ear is the organ of hearing and, in mammals, balance.

New!!: Underwater acoustics and Ear · See more »

Echo sounding

Echo sounding is a type of sonar used to determine the depth of water by transmitting sound pulses into water.

New!!: Underwater acoustics and Echo sounding · See more »

Equator

An equator of a rotating spheroid (such as a planet) is its zeroth circle of latitude (parallel).

New!!: Underwater acoustics and Equator · See more »

Euclidean vector

In mathematics, physics, and engineering, a Euclidean vector (sometimes called a geometric or spatial vector, or—as here—simply a vector) is a geometric object that has magnitude (or length) and direction.

New!!: Underwater acoustics and Euclidean vector · See more »

European Conference on Underwater Acoustics

The European Conference on Underwater Acoustics (ECUA) was a conference on underwater acoustics that took place in Europe every two years, until 2012, when it was held in Edinburgh (Scotland), and organized by the Institute of Acoustics.

New!!: Underwater acoustics and European Conference on Underwater Acoustics · See more »

Explosive material

An explosive material, also called an explosive, is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by the production of light, heat, sound, and pressure.

New!!: Underwater acoustics and Explosive material · See more »

Fin whale

The fin whale (Balaenoptera physalus), also known as finback whale or common rorqual and formerly known as herring whale or razorback whale, is a marine mammal belonging to the parvorder of baleen whales.

New!!: Underwater acoustics and Fin whale · See more »

Fish

Fish are gill-bearing aquatic craniate animals that lack limbs with digits.

New!!: Underwater acoustics and Fish · See more »

France

France, officially the French Republic (République française), is a sovereign state whose territory consists of metropolitan France in Western Europe, as well as several overseas regions and territories.

New!!: Underwater acoustics and France · See more »

Fred Tappert

Frederick Drach Tappert (April 21, 1940 – January 9, 2002) was an American physicist whose primary contributions were in underwater acoustics.

New!!: Underwater acoustics and Fred Tappert · See more »

Fresh water

Fresh water (or freshwater) is any naturally occurring water except seawater and brackish water.

New!!: Underwater acoustics and Fresh water · See more »

Hertz

The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

New!!: Underwater acoustics and Hertz · See more »

Hydroacoustics

Hydroacoustics is the study and application of sound in water.

New!!: Underwater acoustics and Hydroacoustics · See more »

Hydrophone

A hydrophone (Ancient Greek ὕδωρ.

New!!: Underwater acoustics and Hydrophone · See more »

Iceberg

An iceberg or ice mountain is a large piece of freshwater ice that has broken off a glacier or an ice shelf and is floating freely in open water.

New!!: Underwater acoustics and Iceberg · See more »

Intensity (physics)

In physics, intensity is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy.

New!!: Underwater acoustics and Intensity (physics) · See more »

Jacques Charles François Sturm

Jacques Charles François Sturm ForMemRS (29 September 1803 – 15 December 1855) was a French mathematician.

New!!: Underwater acoustics and Jacques Charles François Sturm · See more »

Jean-Daniel Colladon

Jean-Daniel Colladon (15 December 1802, Geneva – 30 June 1893) was a Swiss physicist.

New!!: Underwater acoustics and Jean-Daniel Colladon · See more »

Johnson–Nyquist noise

Johnson–Nyquist noise (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied voltage.

New!!: Underwater acoustics and Johnson–Nyquist noise · See more »

Journal of the Acoustical Society of America

The Journal of the Acoustical Society of America (abbreviated J. Acoust. Soc. Am. or JASA) is a scientific journal in the field of acoustics, published by the Acoustical Society of America.

New!!: Underwater acoustics and Journal of the Acoustical Society of America · See more »

Killer whale

| status.

New!!: Underwater acoustics and Killer whale · See more »

Kilometre

The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; or) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the road network of the United Kingdom where the statute mile is the official unit used.

New!!: Underwater acoustics and Kilometre · See more »

Knot (unit)

The knot is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.15078 mph).

New!!: Underwater acoustics and Knot (unit) · See more »

Lake Geneva

Lake Geneva (le lac Léman or le Léman, sometimes le lac de Genève, Genfersee) is a lake on the north side of the Alps, shared between Switzerland and France.

New!!: Underwater acoustics and Lake Geneva · See more »

Latitude

In geography, latitude is a geographic coordinate that specifies the north–south position of a point on the Earth's surface.

New!!: Underwater acoustics and Latitude · See more »

Leonardo da Vinci

Leonardo di ser Piero da Vinci (15 April 14522 May 1519), more commonly Leonardo da Vinci or simply Leonardo, was an Italian polymath of the Renaissance, whose areas of interest included invention, painting, sculpting, architecture, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography.

New!!: Underwater acoustics and Leonardo da Vinci · See more »

Lobster

Lobsters comprise a family (Nephropidae, sometimes also Homaridae) of large marine crustaceans.

New!!: Underwater acoustics and Lobster · See more »

Low frequency

Low frequency (low freq) or LF is the ITU designation for radio frequencies (RF) in the range of 30 kilohertz (kHz)–300 kHz.

New!!: Underwater acoustics and Low frequency · See more »

Magnesium sulfate

Magnesium sulfate is an inorganic salt with the formula MgSO4(H2O)x where 0≤x≤7.

New!!: Underwater acoustics and Magnesium sulfate · See more »

Mathematician

A mathematician is someone who uses an extensive knowledge of mathematics in his or her work, typically to solve mathematical problems.

New!!: Underwater acoustics and Mathematician · See more »

Mechanical wave

A mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.

New!!: Underwater acoustics and Mechanical wave · See more »

Microphone

A microphone, colloquially nicknamed mic or mike, is a transducer that converts sound into an electrical signal.

New!!: Underwater acoustics and Microphone · See more »

Millionth

One millionth is equal to 0.000 001, or 1 x 10−6 in scientific notation.

New!!: Underwater acoustics and Millionth · See more »

Nature (journal)

Nature is a British multidisciplinary scientific journal, first published on 4 November 1869.

New!!: Underwater acoustics and Nature (journal) · See more »

Naval mine

A naval mine is a self-contained explosive device placed in water to damage or destroy surface ships or submarines.

New!!: Underwater acoustics and Naval mine · See more »

Neutrino

A neutrino (denoted by the Greek letter ν) is a fermion (an elementary particle with half-integer spin) that interacts only via the weak subatomic force and gravity.

New!!: Underwater acoustics and Neutrino · See more »

Noise (electronics)

In electronics, noise is an unwanted disturbance in an electrical signal.

New!!: Underwater acoustics and Noise (electronics) · See more »

Ocean acoustic tomography

Ocean acoustic tomography is a technique used to measure temperatures and currents over large regions of the ocean.

New!!: Underwater acoustics and Ocean acoustic tomography · See more »

Ocean Tracking Network

The Ocean Tracking Network is a research effort using implanted acoustic transmitters to study fish migration patterns.

New!!: Underwater acoustics and Ocean Tracking Network · See more »

Octave

In music, an octave (octavus: eighth) or perfect octave is the interval between one musical pitch and another with half or double its frequency.

New!!: Underwater acoustics and Octave · See more »

Pascal (unit)

The pascal (symbol: Pa) is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength.

New!!: Underwater acoustics and Pascal (unit) · See more »

Paul Langevin

Paul Langevin (23 January 1872 – 19 December 1946) was a prominent French physicist who developed Langevin dynamics and the Langevin equation.

New!!: Underwater acoustics and Paul Langevin · See more »

Physical acoustics

Physical acoustics is the area of acoustics and physics that studies interactions of acoustic waves with a gaseous, liquid or solid medium on macro- and micro-levels.

New!!: Underwater acoustics and Physical acoustics · See more »

Physicist

A physicist is a scientist who has specialized knowledge in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe.

New!!: Underwater acoustics and Physicist · See more »

Piezoelectricity

Piezoelectricity is the electric charge that accumulates in certain solid materials (such as crystals, certain ceramics, and biological matter such as bone, DNA and various proteins) in response to applied mechanical stress.

New!!: Underwater acoustics and Piezoelectricity · See more »

Plankton

Plankton (singular plankter) are the diverse collection of organisms that live in large bodies of water and are unable to swim against a current.

New!!: Underwater acoustics and Plankton · See more »

Plume (fluid dynamics)

In hydrodynamics, a plume is a column of one fluid moving through another.

New!!: Underwater acoustics and Plume (fluid dynamics) · See more »

Precipitation

In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity.

New!!: Underwater acoustics and Precipitation · See more »

Pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

New!!: Underwater acoustics and Pressure · See more »

Propagation loss

In underwater acoustics, propagation loss is a measure of the reduction in sound intensity as the sound propagates away from an underwater sound source.

New!!: Underwater acoustics and Propagation loss · See more »

Radar

Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.

New!!: Underwater acoustics and Radar · See more »

Rain gauge

A rain gauge (also known as an udometer, pluviometer, or an ombrometer) is an instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time.

New!!: Underwater acoustics and Rain gauge · See more »

Refraction (sound)

Refraction, in acoustics, comparable to the refraction of electromagnetic radiation, is the bending of sound propagation trajectories (rays) in inhomogeneous elastic media (gases, liquids, and solids) in which the wave velocity is a function of spatial coordinates.

New!!: Underwater acoustics and Refraction (sound) · See more »

Reginald Fessenden

Reginald Aubrey Fessenden (October 6, 1866 – July 22, 1932) was a Canadian-born inventor, who did a majority of his work in the United States and also claimed U.S. citizenship through his American-born father.

New!!: Underwater acoustics and Reginald Fessenden · See more »

Remotely operated underwater vehicle

A remotely operated underwater vehicle (ROV) is a tethered underwater mobile device.

New!!: Underwater acoustics and Remotely operated underwater vehicle · See more »

Reverberation

Reverberation, in psychoacoustics and acoustics, is a persistence of sound after the sound is produced.

New!!: Underwater acoustics and Reverberation · See more »

RMS Titanic

RMS Titanic was a British passenger liner that sank in the North Atlantic Ocean in the early hours of 15 April 1912, after colliding with an iceberg during its maiden voyage from Southampton to New York City.

New!!: Underwater acoustics and RMS Titanic · See more »

Root mean square

In statistics and its applications, the root mean square (abbreviated RMS or rms) is defined as the square root of the mean square (the arithmetic mean of the squares of a set of numbers).

New!!: Underwater acoustics and Root mean square · See more »

Salinity

Salinity is the saltiness or amount of salt dissolved in a body of water (see also soil salinity).

New!!: Underwater acoustics and Salinity · See more »

Scalar (mathematics)

A scalar is an element of a field which is used to define a vector space.

New!!: Underwater acoustics and Scalar (mathematics) · See more »

Scarlet wrasse

Pseudolabrus miles, the scarlet wrasse, is a species of wrasse endemic to the waters around New Zealand.

New!!: Underwater acoustics and Scarlet wrasse · See more »

Seawater

Seawater, or salt water, is water from a sea or ocean.

New!!: Underwater acoustics and Seawater · See more »

Seismic source

A seismic source is a device that generates controlled seismic energy used to perform both reflection and refraction seismic surveys.

New!!: Underwater acoustics and Seismic source · See more »

Seismology

Seismology (from Ancient Greek σεισμός (seismós) meaning "earthquake" and -λογία (-logía) meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies.

New!!: Underwater acoustics and Seismology · See more »

Side-scan sonar

Side-scan sonar (also sometimes called side scan sonar, sidescan sonar, side imaging sonar, side-imaging sonar and bottom classification sonar) is a category of sonar system that is used to efficiently create an image of large areas of the sea floor.

New!!: Underwater acoustics and Side-scan sonar · See more »

Signal processing

Signal processing concerns the analysis, synthesis, and modification of signals, which are broadly defined as functions conveying "information about the behavior or attributes of some phenomenon", such as sound, images, and biological measurements.

New!!: Underwater acoustics and Signal processing · See more »

SOFAR channel

Sound speed as a function of depth at a position north of Hawaii in the Pacific Ocean derived from the 2005 World Ocean Atlas. The SOFAR channel axis is at ca. 750-m depth The SOFAR channel (short for Sound Fixing and Ranging channel), or deep sound channel (DSC), is a horizontal layer of water in the ocean at which depth the speed of sound is at its minimum.

New!!: Underwater acoustics and SOFAR channel · See more »

Sonar

Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.

New!!: Underwater acoustics and Sonar · See more »

Sonoluminescence

Sonoluminescence is the emission of short bursts of light from imploding bubbles in a liquid when excited by sound.

New!!: Underwater acoustics and Sonoluminescence · See more »

Sound

In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid.

New!!: Underwater acoustics and Sound · See more »

Sound intensity

Sound intensity level also known as acoustic intensity is defined as the power carried by sound waves per unit area in a direction perpendicular to that area.

New!!: Underwater acoustics and Sound intensity · See more »

Sound pressure

Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average or equilibrium) atmospheric pressure, caused by a sound wave.

New!!: Underwater acoustics and Sound pressure · See more »

Sound speed gradient

In acoustics, the sound speed gradient is the rate of change of the speed of sound with distance, for example with depth in the ocean, or height in the Earth's atmosphere.

New!!: Underwater acoustics and Sound speed gradient · See more »

Spectral density

The power spectrum S_(f) of a time series x(t) describes the distribution of power into frequency components composing that signal.

New!!: Underwater acoustics and Spectral density · See more »

Speed of sound

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium.

New!!: Underwater acoustics and Speed of sound · See more »

Sperm whale

The sperm whale (Physeter macrocephalus) or cachalot is the largest of the toothed whales and the largest toothed predator.

New!!: Underwater acoustics and Sperm whale · See more »

Submarine

A submarine (or simply sub) is a watercraft capable of independent operation underwater.

New!!: Underwater acoustics and Submarine · See more »

Submersible

A submersible is a small vehicle designed to operate underwater.

New!!: Underwater acoustics and Submersible · See more »

Swiss people

The Swiss (die Schweizer, les Suisses, gli Svizzeri, ils Svizzers) are the citizens of Switzerland, or people of Swiss ancestry. The number of Swiss nationals has grown from 1.7 million in 1815 to 7 million in 2016. More than 1.5 million Swiss citizens hold multiple citizenship. About 11% of citizens live abroad (0.8 million, of whom 0.6 million hold multiple citizenship). About 60% of those living abroad reside in the European Union (0.46 million). The largest groups of Swiss descendants and nationals outside Europe are found in the United States and Canada. Although the modern state of Switzerland originated in 1848, the period of romantic nationalism, it is not a nation-state, and the Swiss are not usually considered to form a single ethnic group, but a confederacy (Eidgenossenschaft) or Willensnation ("nation of will", "nation by choice", that is, a consociational state), a term coined in conscious contrast to "nation" in the conventionally linguistic or ethnic sense of the term. The demonym Swiss (formerly in English also Switzer) and the name of Switzerland, ultimately derive from the toponym Schwyz, have been in widespread use to refer to the Old Swiss Confederacy since the 16th century.

New!!: Underwater acoustics and Swiss people · See more »

Target strength

The target strength or acoustic size is a measure of the reflection coefficient of a sonar target.

New!!: Underwater acoustics and Target strength · See more »

Telecommunication

Telecommunication is the transmission of signs, signals, messages, words, writings, images and sounds or information of any nature by wire, radio, optical or other electromagnetic systems.

New!!: Underwater acoustics and Telecommunication · See more »

Telemetry

Telemetry is an automated communications process by which measurements and other data are collected at remote or inaccessible points and transmitted to receiving equipment for monitoring.

New!!: Underwater acoustics and Telemetry · See more »

Temperate climate

In geography, the temperate or tepid climates of Earth occur in the middle latitudes, which span between the tropics and the polar regions of Earth.

New!!: Underwater acoustics and Temperate climate · See more »

Temperature

Temperature is a physical quantity expressing hot and cold.

New!!: Underwater acoustics and Temperature · See more »

Thermocline

A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake) or air (such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.

New!!: Underwater acoustics and Thermocline · See more »

Tonality

Tonality is the arrangement of pitches and/or chords of a musical work in a hierarchy of perceived relations, stabilities, attractions and directionality.

New!!: Underwater acoustics and Tonality · See more »

Toothed whale

The toothed whales (systematic name Odontoceti) are a parvorder of cetaceans that includes dolphins, porpoises, and all other whales possessing teeth, such as the beaked whales and sperm whales.

New!!: Underwater acoustics and Toothed whale · See more »

Transducer

A transducer is a device that converts energy from one form to another.

New!!: Underwater acoustics and Transducer · See more »

Turbulence

In fluid dynamics, turbulence or turbulent flow is any pattern of fluid motion characterized by chaotic changes in pressure and flow velocity.

New!!: Underwater acoustics and Turbulence · See more »

U-boat

U-boat is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, literally "undersea boat".

New!!: Underwater acoustics and U-boat · See more »

Underwater acoustic communication

Underwater acoustic communication is a technique of sending and receiving messages below water.

New!!: Underwater acoustics and Underwater acoustic communication · See more »

Underwater acoustic positioning system

An underwater acoustic positioning system is a system for the tracking and navigation of underwater vehicles or divers by means of acoustic distance and/or direction measurements, and subsequent position triangulation.

New!!: Underwater acoustics and Underwater acoustic positioning system · See more »

Viscosity

The viscosity of a fluid is the measure of its resistance to gradual deformation by shear stress or tensile stress.

New!!: Underwater acoustics and Viscosity · See more »

Water

Water is a transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.

New!!: Underwater acoustics and Water · See more »

Water tank

A water tank is a container for storing water.

New!!: Underwater acoustics and Water tank · See more »

Wind

Wind is the flow of gases on a large scale.

New!!: Underwater acoustics and Wind · See more »

Woods Hole Oceanographic Institution

The Woods Hole Oceanographic Institution (WHOI, acronym pronounced) is a private, nonprofit research and higher education facility dedicated to the study of all aspects of marine science and engineering and to the education of marine researchers.

New!!: Underwater acoustics and Woods Hole Oceanographic Institution · See more »

World War I

World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.

New!!: Underwater acoustics and World War I · See more »

World War II

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.

New!!: Underwater acoustics and World War II · See more »

Redirects here:

Underwater Acoustics, Underwater sound.

References

[1] https://en.wikipedia.org/wiki/Underwater_acoustics

OutgoingIncoming
Hey! We are on Facebook now! »