All articles starting with Q

QSA and QRK radio signal reports

QSA and QRK, together the QSA and QRK code, are radiotelegraph Q-codes for signal reports: QSA grades strength and QRK grades readability, each from 1 to 5.

QSAR model

A quantitative structure–activity relationship (QSAR) model predicts a chemical compound's biological activity or properties from molecular descriptors, and is used in drug discovery and chemical-safety assessment.

QSFP

QSFP (Quad Small Form-factor Pluggable) is a family of hot-pluggable, four-lane transceiver modules, defined by a multi-source agreement in 2006, that connect switches and routers to fiber or copper links.

QSFP-DD

QSFP-DD (Quad Small Form Factor Pluggable Double Density) is a pluggable transceiver form factor that doubles the QSFP family's lanes to eight, supporting 400, 800, and 1600 Gb/s.

QSFP+

QSFP+ (Quad Small Form-factor Pluggable Plus) is a hot-pluggable, four-lane transceiver defined by SFF-8436 that became the dominant form factor for 40 Gigabit Ethernet in data centers.

QSFP28

QSFP28 (Quad Small Form-factor Pluggable 28) is an industry-standard transceiver form factor that carries 100 Gigabit Ethernet over four 25 Gbps lanes, in the same physical size as QSFP+.

QSFP56

QSFP56 (Quad Small Form-Factor Pluggable 56) is a hot-pluggable transceiver form factor, introduced in 2017, that carries 200 Gigabit Ethernet over four lanes at 50 Gb/s each using PAM4 signaling.

QSL card

QSL card: written confirmation of a radio contact or reception, named after the Q code QSL ("I acknowledge receipt"). Used by amateurs and shortwave listeners for awards; first printed card 1922; eQSL digital since 1998.

QSO B0420-0127

QSO B0420-0127, also known as PKS 0420-014 and 4FGL J0423.3-0120, is a blazar in Orion at redshift 0.916, a flat-spectrum radio quasar whose superluminal jet has been monitored across the spectrum since 1969.

QSO B1730-130

QSO B1730-130, also known as NRAO 530 or PKS 1730-130, is a blazar at redshift 0.90 and the most distant object imaged by the Event Horizon Telescope.

QSO J0529−4351

QSO J0529−4351 (SMSS J052915.80−435152.0) is a quasar in the constellation Pictor identified in 2024 as the most luminous quasar known, powered by a 17-billion-solar-mass black hole.

QSO J0738+1742

QSO J0738+1742, also known as PKS 0735+178, is a BL Lacertae object, a blazar whose relativistic jet points nearly at Earth; in 2021 it became a candidate source of an IceCube neutrino.

QSO J1512-0906

QSO J1512-0906, better known in the literature as PKS 1510-089, is a flat-spectrum radio quasar at redshift 0.361 with a jet pointed almost directly at Earth.

qSOFA

qSOFA (quick Sequential Organ Failure Assessment) is a bedside score of 0 to 3 that flags adults with suspected infection at higher risk of sepsis death.

QSZ-11

The QSZ-11 (Type 11; 11式手枪) is a compact semi-automatic defensive pistol adopted by China's People's Liberation Army in 2011, chambered in 5.8×21mm and issued to senior officers, pilots, and astronauts.

QSZ-92 (92式手枪)

The QSZ-92, also known as the Type 92 (92式手枪), is a Chinese semi-automatic service pistol that is the standard sidearm of the People's Liberation Army and many Chinese police forces.

Qt (software)

Qt, also known as the Qt framework, is a cross-platform software framework for building applications with C++, QML, and Python, first released by Troll Tech in 1995.

Qt Creator

Qt Creator is a cross-platform integrated development environment for desktop, embedded, and mobile applications, the official IDE of the Qt framework, first released in 2009.

Qt Group

Qt Group Plc, the Finnish software company behind the Qt cross-platform framework, grew out of Trolltech, was acquired by Nokia, and listed on Nasdaq Helsinki in 2016.

QT interval

QT interval: ECG span from QRS onset to T-wave end, measuring ventricular depolarization and repolarization. Corrected to QTc via Bazett or Fridericia formulas; QTc over 500 ms signals torsades de pointes risk.

QTCinderella

QTCinderella (Blaire) is an American Twitch streamer and baker, founder and host of The Streamer Awards (2022), organizer of Shitcamp and the Roast of Ludwig, Ludwig Ahgren's partner, and Wine About It podcast co-host.

QTL analysis

QTL analysis is a genetics method that maps genomic regions, called quantitative trait loci, contributing to variation in continuously measured traits such as yield or flowering time.

QTL mapping

QTL mapping is a genetics method that locates genomic regions underlying quantitative traits by testing marker–phenotype associations in segregating populations, differing from GWAS in using related individuals.

QTL-seq

QTL-seq, also known as BSA-Seq, is a bulked segregant analysis method that maps quantitative trait loci by resequencing DNA bulks of extreme-phenotype individuals, introduced in rice in 2013.

Qtrove

Qtrove is a Bengaluru-based curated online marketplace for natural, handmade, and non-mass-produced products from small local sellers, launched in late 2015 by Vinamra Pandiya and Prashanth Nagarajan.