All articles starting with Z

Zero Units

Zero Units: CIA-trained, NDS-affiliated Afghan intelligence and paramilitary strike forces (Units 01-04) formed around 2008; known for night raids, documented abuses, and U.S. resettlement after 2021.

Zero waste

Zero waste, or waste free, is a goal and management framework to conserve resources through responsible production, reuse, and recovery, with no burning or harmful discharges.

Zero- to ultralow-field NMR

Zero- to ultralow-field NMR (ZULF NMR) is a modality of nuclear magnetic resonance in magnetic fields of microtesla strength or below, where J-couplings dominate and detection relies on atomic magnetometers.

Zero-backlash gearbox

A zero-backlash gearbox is a speed reducer engineered to have no lost motion when rotation reverses, used in robot joints, telescope drives, and semiconductor equipment.

Zero-based budgeting

Zero-based budgeting is a budgeting method in which every expense is justified from zero each cycle, championed by Peter Pyhrr at Texas Instruments and used by President Carter.

Zero-based numbering

Zero-based numbering, also called zero-based indexing, is the convention of counting a sequence from zero rather than one, standard in C-family languages and defended by Dijkstra's 1982 note EWD 831.

Zero-bias conductance peak

A zero-bias conductance peak is a peak in differential conductance at zero voltage in a superconductor tunnel junction, the most reported signature of Majorana zero modes.

Zero-copy

Zero-copy is a data-transfer technique in which the CPU does not copy buffer contents between memory regions, instead letting hardware access the original memory directly.

Oct 26, 2026

Zero-copy cloning

Zero-copy cloning creates instant logical copies of tables, schemas, databases, or files by copying only metadata or pointers; Snowflake, Fabric, Databricks, YugabyteDB, OpenZFS, and ReFS implement it with copy-on-write divergence and point-in-time variants.

Zero-current switching

Zero-current switching (ZCS) is a soft-switching technique in power electronics in which a resonant circuit forces a semiconductor switch to turn off when its current reaches zero, cutting losses and EMI.

Zero-day vulnerability

A zero-day vulnerability is a flaw in hardware, firmware, or software that is unknown to the vendor, leaving no patch available; exploiting it is a zero-day attack.

Zero-dispersion wavelength

The zero-dispersion wavelength (λ₀) is the wavelength at which an optical fiber's chromatic dispersion crosses zero, so all wavelengths travel at the same group velocity; in standard single-mode fiber it lies near 1310 nm.

Zero-emission certificate (New Jersey)

A zero-emission certificate (ZEC) was a New Jersey instrument, created in 2018, funding nuclear plants Salem 1, Salem 2, and Hope Creek through a customer charge.

Zero-emission credit (Illinois)

A zero-emission credit is a tradable Illinois credit for electricity from nuclear plants, created by the 2016 Future Energy Jobs Act and procured from the Quad Cities and Clinton plants.

Zero-energy building

A zero-energy building, also called a net-zero building, is a highly efficient building that produces enough renewable energy over a year to meet or exceed its own consumption.

Zero-error capacity of quantum channels

The zero-error capacity of a quantum channel is the rate, in bits per channel use, at which messages can be sent with error probability exactly zero, analyzed via noncommutative graphs.

Oct 26, 2026

Zero-ETL

Zero-ETL: data integration without manually built ETL pipelines, using managed CDC replication or federated querying. Led by AWS (Aurora-to-Redshift, announced 2022, GA November 7, 2023); latency seconds to minutes; limited to same-cloud, simple-replication cases.

Zero-field nuclear magnetic resonance

Zero-field nuclear magnetic resonance, part of the broader ZULF NMR family, is a form of NMR without a strong applied field, detecting internal spin-spin couplings directly.

Zero-field splitting

Zero-field splitting (ZFS) is the splitting of spin energy levels in systems with multiple unpaired electrons, arising from spin–spin and spin–orbit coupling, studied in EPR.

Sep 29, 2026

Zero-fluoroscopy catheter ablation

Zero-fluoroscopy catheter ablation is a cardiac electrophysiology technique that replaces X-ray guidance with electroanatomic mapping and intracardiac echocardiography, avoiding radiation and proving as safe and effective as conventional ablation.

Zero-forcing detector

The zero-forcing detector is a linear signal detector in MIMO and multiuser receivers that removes interference completely, using the Moore-Penrose pseudo-inverse of the estimated channel matrix.

Zero-forcing equalizer

A zero-forcing (ZF) equalizer is a linear filter that removes intersymbol interference by inverting the channel's frequency response, though this enhances noise; the MMSE equalizer outperforms it.

Zero-forcing precoding

Zero-forcing precoding is a linear multi-user MIMO technique, used at multi-antenna base stations, that shapes the transmit signal to force all interference between users' streams to zero.

Zero-free region

A zero-free region is a domain near the line Re(s) = 1 of the complex plane where an L-function such as the Riemann zeta function is proved to have no zeros.

Zero-gap CO2 electrolyzer

A zero-gap CO2 electrolyzer, also called a membrane electrode assembly (MEA) cell, is an electrochemical reactor that converts CO2 into fuels, with cathode and anode pressed directly against the membrane.

Zero-hour contract

Zero-hour contract, also called casual contract, a UK employment contract with no guaranteed hours: the employer need not offer work and the worker need not accept it. Covers statutory rights, the 2015 exclusivity-clause ban, prevalence around 1.2 million workers, and the Employment Rights Act 2025 reforms.

Zero-index acoustic metamaterials

Zero-index acoustic metamaterials are engineered structures whose effective refractive index for sound is zero at design frequencies, making the phase uniform and outgoing wavefronts follow the boundary shape.

Zero-index metamaterial

Zero-index metamaterials are artificial photonic materials whose refractive index is zero at a design frequency, giving light infinite effective wavelength and enabling waveguide supercoupling, phase-mismatch-free nonlinear generation, and collective emission from quantum emitters.

Zero-inflated model

A zero-inflated model is a two-component mixture model for count data, combining a point mass at zero with a Poisson or negative binomial count distribution, introduced by Lambert in 1992.