All articles starting with H
20,046 articles
Hypersexuality
Hypersexuality, also called compulsive sexual behavior disorder (ICD-11) or sex addiction, is abnormally extreme, poorly controlled sexual activity; often iatrogenic from dopaminergic drugs in Parkinson's disease, treated first with psychotherapy.
Hypershell
Hypershell (极壳科技) is a Chinese consumer-exoskeleton startup founded in Shanghai in 2021 by Sun Kuan, building lightweight AI-assisted lower-limb exoskeletons for hiking, everyday mobility, and aged-mobility users.
Hypersimplex
A hypersimplex Δd(k) is a convex polytope generalizing the simplex, the slice of the unit cube [0, 1]^d by a hyperplane summing to k, central in polytope and matroid theory.
Hypersomnia
Hypersomnia (hypersomnolence) is excessive daytime sleepiness despite adequate sleep. Includes primary forms (idiopathic hypersomnia, narcolepsy, Kleine-Levin syndrome) and secondary causes; diagnosed by PSG and MSLT after excluding other causes.
Hypersonic flight
Hypersonic flight is flight through an atmosphere at speeds above Mach 5, where aerodynamic heating dominates design; NASA has studied it since the 1950s X-15.
Hypersonic flow
Hypersonic flow is the flow of gas around a body moving faster than Mach 5, a regime dominated by strong shock waves, high-temperature gas effects, and thick boundary layers.
Hypersonic inflatable aerodynamic decelerator
A hypersonic inflatable aerodynamic decelerator (HIAD) is a deployable aeroshell that acts as both heat shield and drag device, packing small and inflating larger than any rocket fairing.
Hypersonic Missiles (album)
Hypersonic Missiles is Sam Fender's debut studio album, released 13 September 2019 on Polydor. Recorded in his North Shields studio with Bramwell Bronte, it debuted at UK Number 1 with 41,000 chart sales.
Hypersonic speed
Hypersonic speed, also called hypersonic velocity, is flight through an atmosphere above Mach 5, where aerodynamic heating rather than lift or drag dominates the physics.
Hypersonic weapon
A hypersonic weapon, also known as a hypersonic missile, is a maneuvering missile that flies at Mach 5 or faster within the atmosphere, as glide vehicles or scramjet-powered cruise missiles.
Hyperspace
Hyperspace is a fictional dimension where normal rules of space and time are altered, allowing travel faster than light. It is conceived as a parallel realm.
Hyperspectral change detection
Hyperspectral change detection compares two co-registered hyperspectral images of the same area, acquired at different times, to locate surface changes, with uses in disaster monitoring, land survey, and military reconnaissance.
Hyperspectral imaging
Hyperspectral imaging, also called imaging spectroscopy, records a scene in hundreds of narrow wavelength bands, letting each pixel's spectrum identify materials in agriculture, geology, food safety, and medicine.
Hyperspectral photoluminescence imaging
Hyperspectral photoluminescence imaging is a non-destructive optical technique that records a full luminescence spectrum at every pixel, used to map defects and local voltage in solar cells.
Hyperspherical coordinates
Hyperspherical coordinates are a coordinate system for several interacting particles in which the hyperradius measures overall size and hyperangles describe shape; they treat all rearrangement channels equally in quantum reactive scattering.
Hypersplenism
Hypersplenism is a syndrome in which an enlarged spleen sequesters and destroys blood cells, causing low counts despite normal bone marrow; the leading cause is portal hypertension from cirrhosis.
HyperStrong
HyperStrong (Beijing HyperStrong Technology, 海博思创) is a Chinese battery energy storage integrator founded in 2011, with over 400 projects, 70 GWh deployed, and a 2025 STAR Market listing.
HyperTalk
HyperTalk is the English-like scripting language of HyperCard, Apple's hypermedia program for the Macintosh first released in 1987; Dan Winkler implemented the language, which Bill Atkinson's program inspired.
Hyperteleaton
Hyperteleaton (Ὑπερτελέατον, Hyperteleatum), ancient sanctuary in Laconia near modern Finiki, Greece, dedicated to Apollo Hyperteleatas and Asclepius; religious center of the Eleutherolaconians, excavated 1885, Archaic Doric temple remains.
Hypertelorism
Hypertelorism is an abnormally increased distance between the orbits (wide-set eyes), graded by Tessier IOD criteria, caused by embryologic craniofacial developmental defects, seen in syndromes like Apert and frontonasal dysplasia, and corrected by box osteotomy or facial bipartition.
Hypertelorism-microtia-facial clefting syndrome
Hypertelorism-microtia-facial clefting syndrome (HMC, Bixler-Christian-Gorlin syndrome, OMIM 239800) is an autosomal recessive malformation syndrome combining hypertelorism, cleft lip and palate, and microtia, with nine reported cases in seven families and no identified gene.
Hypertension
Hypertension (high blood pressure), persistently ≥140/90 mmHg by WHO criteria (≥130/80 by ACC/AHA), affects 1.4 billion adults aged 30–79 in 2024; usually symptomless, it causes stroke, heart attack, and kidney failure.
Hypertension (journal)
Hypertension is the American Heart Association's monthly peer-reviewed hypertension journal, founded 1979 in Dallas, ISSN 0194-911X, edited by Rhian M. Touyz since 2022; distinct from Journal of Hypertension (Springer, 1983).
Hypertension in pregnancy
Hypertension in pregnancy: elevated blood pressure in gestation, defined as ≥140/90 mm Hg on two occasions; includes chronic, gestational, and preeclampsia forms; also the name of the Taylor & Francis journal (ISSN 1525-6065) serving this field.
Hypertensive acute pulmonary edema
Hypertensive acute pulmonary edema is acute heart failure caused by a severe blood pressure spike that floods the lungs, causing abrupt breathlessness at pressures of at least 180/110 mmHg.
Hypertensive crisis
Hypertensive crisis: blood pressure above 180/120 mm Hg, split into hypertensive emergency (acute organ damage, ICU, IV therapy) and severe hypertension without damage; AHA 2024 drops the urgency/crisis terms.
Hypertensive emergency
Hypertensive emergency: blood pressure above 180/120 mm Hg with acute target-organ damage (stroke, heart failure, aortic dissection, renal failure), formerly called malignant hypertension; treated in the ICU with titratable IV drugs, reducing BP by no more than 25% in the first hour.
Hypertensive encephalopathy
Hypertensive encephalopathy (HE), closely related to PRES, is cerebral edema from severe hypertension exceeding autoregulation; treated by lowering mean arterial pressure 20-25%, with 10.4% annual mortality in a French cohort.
Hypertensive heart disease
Hypertensive heart disease, also called hypertensive cardiomyopathy, is heart damage from long-standing high blood pressure, ranging from left ventricular hypertrophy to heart failure and sudden death.
Hypertensive heart failure
Hypertensive heart failure is heart failure caused by chronic pressure overload from high blood pressure, spanning preserved through reduced ejection fraction; hypertension is heart failure's most prevalent risk factor.