42,772 articles
National Society of Black Physicists
The National Society of Black Physicists (NSBP) is an American professional society founded in 1977 at Morgan State University to promote African American physicists and physics students.
National Statistical Commission
The National Statistical Commission (NSC) is the apex body for India's official statistics, created by a government resolution in 2005 under the Ministry of Statistics and Programme Implementation.
National statistical offices of Africa and the Middle East
A survey of the principal national statistical offices of Africa and the Middle East, including Statistics South Africa, Kenya's KNBS, Nigeria's NBS, and Egypt's CAPMAS.
National statistical system
A national statistical system is the set of institutions in a country that produce official statistics, centered on the national statistical office and bound by statistical law.
National student physics associations
National student physics associations are federations of university societies that link local groups into a global network. The International Association of Physics Students (IAPS) is the primary umbrella body.
National Superconducting Cyclotron Laboratory
The National Superconducting Cyclotron Laboratory (NSCL) was a National Science Foundation-funded nuclear physics user facility at Michigan State University that produced rare isotope beams until 2022.
National Synchrotron Light Source II
The National Synchrotron Light Source II (NSLS-II) is a Department of Energy synchrotron light source at Brookhaven National Laboratory in Upton, New York, producing ultrabright X-rays for research.
National traditions in oceanography
National traditions in oceanography are the characteristic ways countries organize the study of the sea through institutions, expeditions, funding, and training, compared across the United States, the Soviet Union, India, and France.
National vital statistics reports : from the Centers for Disease Control and Prevention, National Center for Health Statistics, National Vital Statistics System
National Vital Statistics Reports (NVSR), ISSN 1551-8922, is NCHS/CDC's monthly serial since 1998 (replacing the Monthly Vital Statistics Report) publishing provisional and final U.S. birth, death, marriage, and divorce statistics from the National Vital Statistics System.
National Vital Statistics System
The National Vital Statistics System (NVSS) is the United States' official source of national birth, death, and fetal-death statistics, compiled by the National Center for Health Statistics.
National Weather Association
The National Weather Association (NWA) is a United States nonprofit professional association, incorporated in 1975 to promote operational meteorology; it publishes the Journal of Operational Meteorology and certifies weathercasters.
National Weather Service
The National Weather Service, formerly the United States Weather Bureau, is a US federal agency within NOAA that issues weather forecasts, warnings, and climate data from Silver Spring, Maryland.
Nationally Determined Contributions
Nationally determined contributions, or NDCs, are the climate plans each Paris Agreement country must submit every five years, committing to cut emissions and adapt to climate change.
Native directing group
A native directing group is a coordinating functional group, such as an amine or carboxylic acid, already present in a substrate that steers metal-catalyzed C–H activation to a nearby bond.
Native ion mobility-mass spectrometry
Native ion mobility-mass spectrometry pairs native mass spectrometry with ion mobility separation, revealing the stoichiometry, conformation, and ligand binding of protein complexes from small, unlabeled samples.
Nativity of Mary
The Nativity of Mary, also called Marymas, is the Christian feast of the Virgin Mary's birth, kept on September 8 in the Roman Catholic and Eastern Orthodox calendars.
Natron
Natron is a naturally occurring sodium carbonate decahydrate mineral that forms around saline soda lakes and served ancient Egyptians as the desiccant in mummification and as a glassmaking flux.
Natural bond orbital analysis
Natural bond orbital (NBO) analysis is a computational chemistry method that transforms a calculated molecular wavefunction into localized orbitals, revealing bonding, atomic charges, hybridization, resonance, and donor-acceptor interactions.
Natural boundary
A natural boundary is a boundary of an analytic function's domain where every point is a singularity, blocking analytic continuation entirely, a concept introduced by Weierstrass in 1842.
Natural convection
Natural convection, also called free convection, is heat transfer in a fluid where buoyancy, arising from density differences caused by temperature gradients, drives the flow without any pump or fan.
Natural decay series
A natural decay series is a chain of radioactive nuclides decaying from a long-lived parent to a stable end product, classically four chains headed by thorium, neptunium, and uranium.
Natural deduction
Natural deduction is a logical proof system, described by Gentzen and Jaśkowski in 1934, built by assuming temporary premises and discharging them, with an introduction and elimination rule for each connective.
Natural deep eutectic solvents
Natural deep eutectic solvents (NADES) are green solvents made from natural metabolites such as sugars, amino acids, and choline chloride, proposed by Choi and Verpoorte in 2011.
Natural disaster
A natural disaster is a serious disruption of a community caused by a hazardous natural event, such as an earthquake or flood, producing major human and economic losses.
Natural disasters in India
Natural disasters in India, also known as natural calamities in India, are recurrent floods, cyclones, earthquakes, landslides, droughts, and heat waves causing substantial loss of life and property.
Natural experiment
A natural experiment is a study in which an external event, not the researcher, assigns people to different levels of an intervention, permitting causal estimation from observational data.
Natural filtration
The natural filtration of a stochastic process is the filtration generated by the process itself, the smallest one to which it is adapted, recording only the process's own past behavior.
Natural flow regime
The natural flow regime is the characteristic pattern of streamflow in a river under natural conditions, defined by the magnitude, frequency, duration, timing, and rate of change of flows.
Natural frequency
The natural frequency of a physical system is the frequency at which it oscillates freely, with no driving or damping force; it is also called the eigenfrequency.
Natural gas
Natural gas, also called fossil gas, is a naturally occurring gas mixture found underground, composed mostly of methane and commonly associated with petroleum, burned for electricity, heating, and industry.