42,772 articles
Daya Bay Reactor Neutrino Experiment
The Daya Bay Reactor Neutrino Experiment was a neutrino-oscillation experiment in Guangdong, China, that made the world's first conclusive measurement of the mixing angle θ₁₃ in 2012.
Daya Bay Reactor Neutrino Experiment (大亚湾反应堆中微子实验)
The Daya Bay Reactor Neutrino Experiment (大亚湾反应堆中微子实验) was a neutrino-oscillation experiment in Guangdong, China, that made the first nonzero measurement of the mixing angle θ13 in 2012.
Daylight saving time
Daylight saving time (DST), also called summer time, is the part of the year when clocks are advanced one hour, moving daylight from morning to evening.
Daylight saving time by country
Daylight saving time by country, or DST by country, surveys which of the world's countries observe daylight saving time, about a third of them, mostly in Europe and North America.
Daylight saving time in Canada
Daylight saving time in Canada is set province by province, with clocks changed since 2007 on the second Sunday in March and first Sunday in November.
Daylight saving time in the United States
Daylight saving time in the United States is the federally mandated practice of moving clocks forward from the second Sunday of March to the first Sunday of November.
Dayong Jin
Dayong Jin (金大勇) is an Australian-based photonics researcher known for upconversion nanoprobes, called "Super Dots", and founding the Institute for Biomedical Materials and Devices at the University of Technology Sydney.
Daytime
Daytime, also called daylength, is the period when the Sun is above the horizon and provides natural light. Its length varies with latitude and season because Earth's axis is tilted.
Daytime radiative cooling
Daytime radiative cooling is a passive technique that keeps sunlit surfaces below air temperature by reflecting sunlight and radiating heat to space, first demonstrated in 2014.
Dayton Miller
Dayton Clarence Miller (1866–1941) was an American physicist at Case School of Applied Science in Cleveland, known for acoustics, the phonodeik instrument, and decades of ether-drift experiments repeating Michelson–Morley.
db/db mouse
The db/db mouse is a laboratory mouse with an autosomal recessive mutation in the leptin receptor gene, making it obese and diabetic, and the most widely used animal model of type 2 diabetes.
DBm
dBm (decibel-milliwatt) is a logarithmic unit of absolute power referenced to one milliwatt, with 0 dBm exactly 1 mW, standard for stating signal power in RF engineering, wireless networking, and optical systems.
DBZ (meteorology)
DBZ, or decibels relative to Z, is a logarithmic unit used in weather radar to measure radar reflectivity from precipitation, with values above about 50 dBZ indicating hail.
DC programming
DC programming is an optimization framework for minimizing a function expressed as a difference of two convex functions, applied to nonconvex problems in machine learning and finance.
DCF77
DCF77 is a German longwave radio station on 77.5 kHz, broadcasting German legal time from Mainflingen near Frankfurt since 1959 to radio-controlled clocks across Europe.
DDEC6
DDEC6 is an electron density partitioning method that assigns net atomic charges, atomic spin moments, and bond orders in materials, introduced by Manz and Limas in 2015.
De Broglie–Bohm theory
De Broglie–Bohm theory, also called Bohmian mechanics or pilot-wave theory, is a deterministic interpretation of quantum mechanics where a wave function guides particles along definite trajectories.
De Bruijn graph
A de Bruijn graph is a directed graph whose vertices are strings and whose edges are k-length strings linking a prefix to its overlapping suffix, central to short-read genome assembly.
De Bruijn sequence
A de Bruijn sequence, or Ouroborean ring, is a cyclic sequence in which every possible length-n string over an alphabet occurs exactly once as a consecutive block.
De Casteljau's algorithm
De Casteljau's algorithm, developed by Paul de Casteljau at Citroën in 1963, evaluates a point on a Bézier curve from its control points by repeated linear interpolation.
De Chen
De Chen (陈德) is a professor of catalysis at the Norwegian University of Science and Technology in Trondheim, working on heterogeneous catalysis, biomass conversion, and energy storage.
De Finetti's theorem
De Finetti's theorem, also called de Finetti's representation theorem, is a result in probability theory: every infinite exchangeable sequence is a mixture of i.i.d. sequences.
De Geer chronology
The De Geer chronology, formally the Swedish Time Scale, is a year-by-year timeline built from counting glacial varves, assembled by Swedish geologist Gerard De Geer from 1882 onward.
De Giorgi–Nash–Moser theorem
The De Giorgi–Nash–Moser theorem is a result in PDE regularity theory: weak solutions of divergence-form equations with rough coefficients are Hölder continuous, proved by De Giorgi, Nash, and Moser in 1957–1960.
de Haas–van Alphen effect
The de Haas–van Alphen effect is the periodic oscillation of a metal's magnetic susceptibility in a strong magnetic field, first observed in bismuth in 1930.
De Magnete
De Magnete is a Latin treatise on magnetism by the English physician William Gilbert, printed in London in 1600, arguing that the Earth is a giant magnet.
De Martonne aridity index
The De Martonne aridity index (DMI) is a climatic index that classifies a location's dryness as annual precipitation in millimeters divided by mean annual temperature in degrees Celsius plus 10.
De Moivre–Laplace theorem
The de Moivre–Laplace theorem, a special case of the central limit theorem, states that a binomial distribution converges to the normal distribution as the number of trials grows.
De Moivre's formula
De Moivre's formula, also called De Moivre's theorem, states that (cos θ + i sin θ)^n = cos(nθ) + i sin(nθ) for any integer n.
De Morgan's laws
De Morgan's laws, also called De Morgan's theorem, are a pair of rules stating that the negation of AND is the OR of negations, and vice versa.