All articles starting with F
15,892 articles
Flexible perovskite solar cell
A flexible perovskite solar cell is a thin-film photovoltaic device made on bendable substrates such as plastic, metal foil, or ultrathin glass, with single-junction efficiencies now above 23%.
Flexible perovskite solar modules
Flexible perovskite solar modules are photovoltaic modules that integrate multiple perovskite sub-cells on bendable plastic or metal foil substrates, offering high efficiency, low weight, and roll-to-roll manufacturing compatibility.
Flexible post
A flexible post, commonly called a flexible delineator post or flexpost, is a reboundable polyurethane traffic post marking lanes and protected bike lanes that bends when struck and springs upright.
Flexible printed circuit
A flexible printed circuit, also called an FPC or flex PCB, is circuitry printed on a bendable polyimide film instead of a rigid board, used in phones, wearables, and cars.
Flexible shaft
A flexible shaft is a rotating mechanical element that transmits torque between misaligned points, using a helically wound steel wire core turning inside a fixed casing.
Flexible spending account
A flexible spending account (FSA) is a tax-exempt employer account, created by the Revenue Act of 1978, funded by pre-tax salary to pay health care or dependent-care expenses.
Flexible thermoelectrics
Flexible thermoelectrics are thermoelectric materials and devices that convert heat into electricity or pump heat for cooling while bending and stretching to fit curved heat sources.
Flexible ureterorenoscopy
Flexible ureterorenoscopy is an endoscopic urological procedure in which a steerable flexible scope reaches the kidney to treat stones, first-line for renal calculi up to 2 cm.
Flexible ureteroscopy
Flexible ureteroscopy (FURS) is an endoscopic urological procedure in which a steerable flexible scope reaches the kidney to diagnose and treat stones, strictures, and urothelial cancers.
Flexible wing
A flexible wing is an aircraft wing whose shape is set by aerodynamic loads against its own elasticity, from Rogallo hang glider wings to flexible transport flaps.
Flexible-fuel vehicle
A flexible-fuel vehicle (FFV), also called a flex-fuel vehicle, is a car or light truck that runs on gasoline or ethanol-gasoline blends up to 83% ethanol, including E85.
FlexiLoans
FlexiLoans is a Mumbai-based fintech company founded in 2016 that offers collateral-free term loans and supply chain financing digitally to micro, small, and medium enterprises across India.
Fleximize
Fleximize is a British fintech lender, founded in Ipswich in 2014, that provides flexible business loans to small and medium-sized enterprises through its own underwriting technology.
Flexion deformity
Flexion deformity, also called flexion contracture (ICD-11 FA31.2, ICD-10 M21.2), is a bent joint that cannot be straightened actively or passibly due to structural changes in muscle, tendon, ligament, or skin; common in knee osteoarthritis, neuromuscular disease, and brachial plexus birth injury, treated by stretching, bracing, casting, or surgery.
Flexiv
Flexiv (非夕科技) is a general-purpose robotics company founded in 2016 by Stanford-trained engineer Wang Shiquan, headquartered in Shanghai, that builds adaptive robot arms and grippers around force-sensing technology.
Flexjet
Flexjet is a fractional private jet ownership and leasing company in Richmond Heights, Ohio, founded in 1995 as a Bombardier venture and owned by Directional Aviation since 2013.
Flexoelectricity
Flexoelectricity is an electromechanical coupling in which a gradient of mechanical strain induces electric polarization, and conversely an electric field gradient induces stress; unlike piezoelectricity, it occurs in all dielectrics.
Flexographic printing
Flexographic printing is a rotary relief process, essentially a rotating rubber stamp, using flexible rubber or photopolymer plates to print fast-drying ink on films, labels, and corrugated board.
Flexography
Flexography, commonly called flexo, is a relief printing process, derived from letterpress, that uses flexible plates and fluid inks to print packaging and labels, first developed in 1890.
Flexor digitorum profundus muscle
Flexor digitorum profundus (FDP), deep forearm flexor muscle; flexes DIP joints of the four medial fingers, dual median/ulnar innervation, inserts on distal phalanges; site of jersey finger and quadrigia.
Flexor retinaculum of the hand
Flexor retinaculum of the hand, also called the transverse carpal ligament: fibrous band forming the carpal tunnel roof, attached to scaphoid, trapezium, pisiform, and hamate hook, retaining nine flexor tendons and the median nerve; released in carpal tunnel surgery.
Flexport
Flexport is a San Francisco-based digital freight forwarder and customs broker founded by Ryan Petersen in 2013, arranging ocean, air, rail, and trucking freight through software.
FlexRay
FlexRay is a deterministic, fault-tolerant, high-speed communications protocol for in-vehicle networks developed by an automotive consortium, first used in the 2007 BMW X5 for electronic damper control.
Flexural strength
Flexural strength, also called modulus of rupture or bending strength, is the maximum stress a material's outer surface sustains before it yields or fractures in a bending test.
Flexural test
A flexural test applies a bending load to a beam specimen to measure flexural strength, modulus, and stress–strain behavior, mainly for characterization and quality control.
FLG-AS1
FLG-AS1 (FLG antisense RNA 1, ENSG00000237975, HGNC 27913, now CCDST) is a human lncRNA gene at 1q21.3 antisense to FLG, linked to psoriasis, atopic dermatitis, and several cancers via miRNA axes.
FLI1
FLI1 (Friend leukemia integration 1, Fli-1) is an ETS-family transcription factor gene on chromosome 11q24.3 governing hematopoiesis, endothelial development, and platelets; hemizygous loss causes Paris-Trousseau syndrome, and EWSR1::FLI1 fusion drives most Ewing sarcoma.
Flibanserin
Flibanserin (Addyi) is a daily 5-HT1A agonist/5-HT2A antagonist pill for hypoactive sexual desire disorder in women, FDA-approved 2015 for premenopausal women and expanded December 2025 to women under 65; boxed warning for alcohol-related hypotension.
FLiBe
FLiBe is a molten salt of lithium fluoride and beryllium fluoride, developed at Oak Ridge in the 1940s and now a leading coolant and tritium breeder for fusion blankets.
Flick of the Switch
Flick of the Switch is AC/DC's 1983 studio album, the band's first self-produced record, recorded at Compass Point Studios, Nassau, reaching number 4 in the UK, number 15 in the US, and later going Platinum there.