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Quantum Gravity

Claus Kiefer.

April 2012; published online May 2012.

Book. Subjects: mathematical and statistical physics. 408 pages.

This book is concerned with the attempts to unify Einstein's theory of general relativity and quantum theory into a theory of quantum gravity. It presents, for the first time, most of the...

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Novel Superfluids

Karl-Heinz Bennemann and John B. Ketterson.

February 2013; published online May 2013.

Book. Subjects: nuclear physics. 648 pages.

This book reports on the latest developments in the field of superfluidity. The phenomenon has had a tremendous impact on the fundamental sciences as well as a host of technologies. It...

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An Introduction to Statistical Mechanics and Thermodynamics

Robert H. Swendsen.

March 2012; published online December 2013.

Book. Subjects: condensed matter physics. 424 pages.

This book is an introduction to statistical mechanics and thermodynamics. Relevant probability theory is included. Part 1 develops the basic ideas of statistical mechanics, as illustrated...

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Engineering Mechanics of Deformable Solids

Sanjay Govindjee.

October 2012; published online December 2013.

Book. Subjects: condensed matter physics. 352 pages.

This book covers the essential elements of engineering mechanics for mechanical elements in tension-compression, torsion, and bending. Its approach emphasizes a fundamental bottom-up...

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americium

Overview page. Subjects: chemistry — physics.

Symbol Am. A radioactive metallic transuranic element belonging to the actinoids; a.n. 95; mass number of most stable isotope 243 (half-life 7.95 × 103 years); r.d. 13.67 (20°C); m.p. 994 ±...

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ammeter

Overview page. Subjects: physics.

An instrument that measures electric current. The main types are the moving-coil ammeter, the moving-iron ammeter, and the thermoammeter. The moving-coil instrument is a moving-coil...

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ammonia clock

Overview page. Subjects: chemistry — physics.

A form of atomic clock in which the frequency of a quartz oscillator is controlled by the vibrations of excited ammonia molecules. The ammonia molecule (NH3) consists of a pyramid with a...

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ampere-hour

Overview page. Subjects: chemistry — physics.

A practical unit of electric charge equal to the charge flowing in one hour through a conductor passing one ampere. It is equal to 3600 coulombs.

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Ampère's law

Overview page. Subjects: physics.

A law of the form

dB = (μo I sin θ dl)/4πr 2,

where dB is the infinitesimal element of the magnitude of the magnetic flux density (see magnetic...

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Ampère's rule

Overview page. Subjects: physics.

A rule that relates the direction of the electric current passing through a conductor and the magnetic field associated with it. The rule states that if the electric current is moving away...

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