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Transition metal carbyne complex
A transition metal carbyne complex, also known as an alkylidyne complex, is an organometallic compound with a formal metal–carbon triple bond, first synthesized by Fischer's group in 1973.
Transition metal complex
A transition metal complex is a compound in which a central transition metal atom or ion is bound to surrounding ligands, with spin states governing its magnetism, geometry, and reactivity.
Transition metal dichalcogenide electrocatalysts
Transition metal dichalcogenide electrocatalysts are layered MX₂ compounds, especially MoS₂ and WS₂, first reported around 1976 and studied as earth-abundant alternatives to platinum for the hydrogen evolution reaction.
Transition metal dichalcogenide monolayers
Transition metal dichalcogenide monolayers are single-atomic-layer semiconductors of the form MX2, such as MoS2 and WSe2, which become direct-gap materials known for strong excitons and valleytronics.
Transition metal dichalcogenides
Transition metal dichalcogenides, abbreviated TMDs or TMDCs, are layered compounds of formula MX₂ combining a transition metal with a chalcogen, exfoliable into atomically thin two-dimensional materials.
Transition metal phosphide
A transition metal phosphide is a compound of phosphorus with a transition metal like nickel or cobalt, studied since the 2000s as hydroprocessing and hydrogen-evolution catalysts.
Transition metal selenide electrocatalysts
Transition metal selenide electrocatalysts are low-cost compounds of transition metals such as Fe, Co, Ni, and Mo with selenium that accelerate the hydrogen and oxygen evolution reactions for water splitting.
Transition metal thioether complex
A transition metal thioether complex is a coordination compound in which a neutral thioether, an organic sulfide of the form R–S–R′, donates a lone pair to a transition metal.
Transition metal thiolate complex
A transition metal thiolate complex, also called a metal thiolate complex, is a coordination compound with strongly covalent metal-sulfur bonds, found in iron-sulfur enzymes, metallothioneins, and pincer-ligated catalysts.
Transition metal thiophosphates
Transition metal thiophosphates, also called metal phosphorus trichalcogenides, are layered MPX₃ van der Waals compounds that stay antiferromagnetic in atomically thin layers, studied for batteries, catalysis, and spintronics.
Transition metal trichalcogenides
Transition metal trichalcogenides (TMTCs) are quasi-one-dimensional compounds of formula MX₃, where a transition metal such as Ti, Nb, or Ta bonds to sulfur, selenium, or tellurium to form chains used in transistors and photodetectors.
Transition path sampling
Transition path sampling (TPS) is a molecular simulation method, introduced by Dellago and colleagues in 1998, that harvests rare reactive trajectories between metastable states without needing a reaction coordinate.
Transition Pathway Initiative
The Transition Pathway Initiative (TPI) is an asset-owner-led initiative, launched in 2017, that publishes free assessments of how listed companies are preparing for the low-carbon transition.
Transition piece
A transition piece is the steel structure connecting an offshore wind turbine's tower to its foundation, transferring loads while carrying boat landings, ladders, platforms, and cable routing.
Transition radiation
Transition radiation is electromagnetic radiation emitted when a charged particle crosses a boundary between two media with different dielectric permittivities, becoming useful for particle detection at relativistic speeds.
Transition region (Sun)
The transition region is a thin layer of the Sun's atmosphere separating the hot corona from the cooler chromosphere, where the temperature drops from about 1,000,000°C to 20,000°C.
Transition Region and Coronal Explorer
The Transition Region and Coronal Explorer (TRACE) was a NASA Small Explorer satellite that imaged the Sun's transition region and corona in ultraviolet light from 1998 to 2010.
Transition state
The transition state is the highest-energy molecular configuration along an elementary reaction's reaction coordinate, central to transition state theory, developed in 1935 by Eyring and by Evans and Polanyi.
Transition state theory
Transition state theory, also known as activated complex theory or absolute rate theory, explains chemical reaction rates through an activated complex at the transition state, formulated in 1935.
Transition Temperature
Transition temperature: the temperature at which a substance changes state or conformation (melting, boiling, freezing, glass transition). Classified by Ehrenfest order, measured by DSC and DMA, compiled by NIST.
Transition to Adult Care
Transition to adult care (health care transition, HCT): the planned move of adolescents, especially those with chronic conditions, from child-centered pediatric services to adult-oriented care, using frameworks such as Got Transition's Six Core Elements and NICE guidance, with planning from about age 12 and transfer around 18 to 21.
Transition VC
Transition VC is a Bengaluru-based venture capital firm founded by Raiyaan Shingati and Mohammed Shoeb Ali that invests in early-stage Indian energy transition startups, including electrification and energy storage.
Transition-edge sensor
A transition-edge sensor, or TES, is a superconducting device that measures the energy of individual photons or particles through the tiny temperature rise they produce.
Transition-metal dichalcogenide optoelectronics
Transition-metal dichalcogenide optoelectronics uses atomically thin semiconductors such as MoS₂ and WSe₂, whose direct band gaps and tightly bound excitons enable light emitters and photodetectors.
Transition-metal dissolution and crossover
Transition-metal dissolution and crossover is a lithium-battery degradation process in which manganese, nickel, and cobalt ions leach from the cathode and deposit on the anode.
Transitional Care
Transitional care, also called care transitions or home transition, is health care during a patient's move between care settings, chiefly hospital to home; evidence shows low- and medium-complexity interventions reduce readmissions and ED visits.
Transitional Committee for the Salvation of the People
The Transitional Committee for the Salvation of the People (CTSP) was the civilian-majority body that governed Mali from 1991 to 1992, led by Amadou Toumani Touré.
Transitional epithelium
Transitional epithelium, or urothelium, is the distensible stratified epithelium lining the renal calyces, ureters, bladder, and proximal urethra, with umbrella cells, uroplakin plaques, and tight junctions forming a stretchable urine barrier.
Transitional Federal Government
The Transitional Federal Government (TFG) was Somalia's internationally recognized provisional government from 2004 to 2012, created by a Kenyan peace process and succeeded by the Federal Government of Somalia.
Transitional Government of Ethiopia
The Transitional Government of Ethiopia (TGE) was the interim administration that ruled Ethiopia from 1991 to 1995, established after the EPRDF overthrew the Derg dictatorship.