All articles starting with D
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Dielectric resonator
A dielectric resonator is a high-permittivity, low-loss ceramic that stores microwave energy as standing waves, used in mobile phone filters, oscillators, and antennas, with less loss than metal cavities.
Dielectric resonator antenna
The dielectric resonator antenna (DRA) is a low-profile microwave antenna in which a dielectric resonator on a ground plane radiates directly, avoiding the conduction losses of metal antennas, especially at millimeter-wave frequencies.
Dielectric screening in halide perovskites
Dielectric screening in halide perovskites is the weakening of Coulomb interactions by the polarizable dielectric lattice response, underlying defect tolerance and additive-based solar cell design.
Dielectric spectroscopy
Dielectric spectroscopy characterizes a material by applying an electric field across a wide frequency range, roughly 10⁻⁶ to 10¹² Hz, and measuring the complex permittivity to reveal dipolar dynamics, charge transport, and interfacial polarization.
Dielectric strength
Dielectric strength is the maximum electric field an insulating material can withstand without breaking down and becoming electrically conductive, typically measured in kV/mm; air is about 3 kV/mm.
Dielectric waveguide
A dielectric waveguide confines electromagnetic waves in a core of glass, plastic, or sapphire by total internal reflection, spanning optical fibers, terahertz rods, and integrated photonic chips.
Dielectric-barrier discharge
A dielectric-barrier discharge (DBD), historically called a silent discharge, is a cold, non-equilibrium plasma generated at atmospheric pressure between electrodes separated by an insulating dielectric layer.
Dielectric-dependent hybrid functionals
Dielectric-dependent hybrid functionals (DDH) are exchange-correlation approximations in density functional theory, introduced for solids in 2014, that replace fixed empirical exchange mixing with a value set by dielectric screening.
Dielectronic recombination
Dielectronic recombination is a resonant electron-ion recombination process in which a captured free electron simultaneously excites a bound electron; the doubly excited state stabilizes by emitting a photon.
Dielectrophoresis
Dielectrophoresis (DEP) is an electrokinetic technique in which nonuniform electric fields move neutral, polarizable particles without labels or contact, used for cell separation and sorting.
Diella (AI system)
Diella, also known as Diella AI, is an Albanian government AI system on the e-Albania portal, appointed "Minister of State for Artificial Intelligence" in September 2025 to fight corruption.
Diels–Alder reaction
The Diels–Alder reaction, also called diene synthesis, is a concerted organic reaction combining a conjugated diene with a dienophile to form a cyclohexene ring, reported by Otto Diels and Kurt Alder in 1928.
Diels–Alder with inverse electron demand
The inverse electron demand Diels–Alder (IEDDA) is a fast [4+2] cycloaddition in which an electron-poor diene, usually a tetrazine, reacts with a strained alkene, releasing nitrogen gas.
Diem (digital currency)
Diem, announced in 2019 as Libra, was a Facebook-backed stablecoin payment system that was renamed in 2020 and never launched, its assets sold to Silvergate Capital in 2022.
Diem Brown
Diem Brown (1980–2014), American reality TV personality and entertainment reporter; competed in eight seasons of MTV's The Challenge, publicly battled ovarian cancer, and founded the patient support site MedGift.
Dien Hong Council
The Dien Hong Council (Hội nghị Diên Hồng) was a 1284 assembly of village elders in Thang Long that unanimously advised war against the Mongol-Yuan invasion.
Diencephalic syndrome
Diencephalic syndrome (Russell syndrome, diencephalic cachexia): rare infantile disorder from hypothalamic or optic chiasm low-grade glioma causing severe emaciation with preserved linear growth, hyperactivity, and euphoria; under 200 reported cases.
Diencephalic-mesencephalic junction dysplasia
Diencephalic-mesencephalic junction dysplasia (DMJD, ORPHA:319192) is a rare autosomal recessive brain malformation with a butterfly-shaped midbrain on MRI, caused by PCDH12 or GSX2 variants.
Dienestrol
Dienestrol (dienoestrol, Estraguard, Ortho Dienestrol), synthetic non-steroidal stilbestrol estrogen, C18H18O2, CAS 84-17-3, prepared by Dodds in 1938; used as 0.01% vaginal cream for atrophic vaginitis; FDA-approved 1947, later discontinued.
Dieng Volcanic Complex
Dieng Volcanic Complex (Kompleks Vulkanik Dieng): a late Quaternary complex volcano and highland plateau in Central Java, Indonesia, with active phreatic craters, a deadly 1979 CO2 eruption, geothermal fields, and ancient Hindu temples.
Dienochlor
Dienochlor is an organochlorine insecticide and acaricide, first reported in 1964, that controlled plant-damaging mites on ornamentals in greenhouses and outdoors; it is now obsolete.
Dienogest
Dienogest (Visanne) is a fourth-generation progestin, 2 mg daily oral therapy for endometriosis pain, first approved in Japan in 2008; also used with estradiol in contraceptives like Natazia, with irregular bleeding as its main side effect.
DIEP flap
The DIEP flap, or deep inferior epigastric perforator flap, is a microsurgical breast reconstruction technique that transfers lower abdominal skin and fat while sparing the rectus muscle.
Dieppe Raid
Operation Jubilee, the Dieppe Raid of 19 August 1942: a failed Anglo-Canadian amphibious raid on occupied Dieppe, France, mainly by the 2nd Canadian Infantry Division, costing over 4,000 Canadian casualties and shaping later D-Day planning.
Dieric Bouts
Dieric Bouts (c. 1410/1420–1475) was an early Netherlandish painter of Leuven, known for the Altarpiece of the Last Supper and the Justice of Emperor Otto III panels.
Dierk Raabe
Dierk Raabe is a German metallurgist, director of the Max Planck Institute for Sustainable Materials in Düsseldorf since 1999, known for crystal plasticity simulation and green steel.
Dierks Bentley
Dierks Bentley (born 1975, Phoenix) is an American country singer-songwriter known for blending country with bluegrass. Debut single "What Was I Thinkin'" (2003) hit No. 1; 22 No. 1 singles, Grand Ole Opry member since 2005, albums through Broken Branches (2025).
Diersheim
Diersheim (Rheinau-Diersheim, Ortenaukreis, Germany), village on the right bank of the Rhine about 20 km northeast of Strasbourg, site of two 1st-century AD cremation cemeteries of the Suebi 'Oberrheingermanen', excavated in the 1930s (Oberfeld) and 2015-2020 (Diersheim II).
Dies irae
Dies irae (Dies iræ), Latin for "Day of Wrath," is a medieval Latin sequence sung in the Catholic Requiem Mass, traditionally attributed to Thomas of Celano.
Diés Iraé
Diés Iraé (ഡീയസ് ഈറേ), Latin for Day of Wrath, is a 2025 Malayalam horror thriller written and directed by Rahul Sadasivan, starring Pranav Mohanlal as Rohan, haunted after a classmate's suicide; released 31 October 2025, biggest A-rated Malayalam opener.