edgepedia

Technology and the built world

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Pashupatinath Temple (पशुपतिनाथ मन्दिर)

Pashupatinath Temple (पशुपतिनाथ मन्दिर) is a Hindu temple dedicated to Shiva as Pashupati on the Bagmati River in Kathmandu, Nepal, the country's most revered temple.

Pasir Coal Mine

The Pasir coal mine is a large open-pit coal mine in Paser Regency, East Kalimantan, Indonesia, operated by PT Kideco Jaya Agung and the third largest in Indonesia.

Pasir Gudang SIPP power station

The Pasir Gudang SIPP power station, formally the Sultan Ibrahim Power Plant, is a 1,440 MW gas-fired combined-cycle power station in Pasir Gudang, Johor, Malaysia, opened in 2021.

Paso Diablo Coal Mine

Paso Diablo Coal Mine (Mina Paso Diablo) is an open-pit mine in the Guasare Basin of Zulia State, Venezuela, the country's largest coal mine since 1987.

Pass transistor logic

Pass transistor logic (PTL) is a digital circuit design style in which MOSFETs act as switches that route logic signals, often needing fewer transistors than static CMOS.

Pass@k

Pass@k is a metric for evaluating code-generating language models: the probability that at least one of k sampled solutions passes a problem's unit tests, introduced by OpenAI in 2021.

Passage vortex

The passage vortex is the dominant secondary flow vortex in a turbomachinery blade passage, formed from endwall boundary layer vorticity and a major source of aerodynamic loss.

Passenger 57

Passenger 57 is a 1992 American action thriller directed by Kevin Hooks, starring Wesley Snipes as an airline security expert who battles hijackers aboard a plane.

Passenger name record

A passenger name record (PNR) is the reservation data airlines collect to process bookings, containing itinerary, ticket, contact, and payment information, later transferred to governments for border control.

Passengers (2008 film)

Passengers is a 2008 American supernatural mystery thriller directed by Rodrigo García, starring Anne Hathaway and Patrick Wilson as a grief counselor and a crash survivor.

Passengers of the Titanic

The roughly 1,300 fare-paying passengers of the Titanic, sailing in three classes in April 1912, saw survival rates vary sharply by sex, age, and ticket class.

PASSER

PASSER, short for Progression Analysis and Signal System Evaluation Routine, is a family of traffic signal timing programs from the Texas Transportation Institute that optimizes coordinated timings by maximizing progression bandwidth.

Passes Inc.

Passes Inc. is an American creator-economy company founded in 2022 by Lucy Guo, operating a subscription platform where creators sell exclusive content directly to fans.

Passivating contact

A passivating contact, sometimes called a passivating junction, is a contact in a silicon solar cell that suppresses carrier recombination and transports only one carrier type to the electrode.

Passivation (chemistry)

Passivation, also known as surface passivation, is the spontaneous formation of a thin, resistant surface film that greatly reduces a metal's corrosion rate in oxidizing environments.

Passivation (spacecraft)

Passivation in spacecraft engineering removes stored energy from a vehicle at mission end, by venting propellant and discharging batteries, to prevent explosive breakup and orbital debris.

Passive autocatalytic hydrogen recombiner

A passive autocatalytic hydrogen recombiner (PAR) is a passive nuclear reactor safety device that recombines hydrogen and oxygen into water vapor on a catalyst without external power.

Passive cooling

Passive cooling dissipates heat from buildings and electronics without powered components such as compressors or pumps, using radiation, conduction, natural convection, and evaporation; it matters because buildings use about 30% of global final energy.

Passive design

Passive design is an architectural and building-engineering approach that heats and cools buildings through orientation, insulation, shading, thermal mass, and ventilation rather than mechanical systems.

Passive DNS

Passive DNS (pDNS) is a technique for collecting DNS response data at network sensors and archiving it to answer historical questions, described by Florian Weimer in 2005.

Passive dynamic walking

Passive dynamic walking is a mode of bipedal locomotion in which an unpowered, uncontrolled robot walks stably down a shallow slope, named by Tad McGeer in 1990.

Passive house

A passive house (Passivhaus) is an ultra-low-energy building standard limiting heating demand to 15 kWh per square meter yearly, first demonstrated in Darmstadt, Germany, in 1991.

Passive House Planning Package

The Passive House Planning Package (PHPP) is an Excel-based energy balancing and design tool for energy-efficient buildings, first released by the Passive House Institute in Darmstadt, Germany, in 1997.

Passive optical network

A passive optical network (PON) is a fiber-optic access network using unpowered splitters to link one provider terminal to many customers, the dominant fiber-to-the-home system.

Passive radar

Passive radar is a class of radar that detects and tracks targets without transmitting any signal of its own, instead exploiting existing broadcast, communications, or radionavigation signals.

Passive sonar

Passive sonar is a method of underwater detection that listens for sound radiated by targets such as submarines, ships, and whales, without transmitting any sound of its own, using hydrophones.

Passivity-based control

Passivity-based control (PBC) is a controller design method for nonlinear systems that stabilizes them by shaping energy storage and dissipation, introduced by Romeo Ortega and Mark Spong in 1989.

Passivity-based impedance control

Passivity-based impedance control is a robot control approach for stable physical interaction, in which the robot behaves like a mechanical impedance and the closed loop is passive.

Passivity-based teleoperation

Passivity-based teleoperation is a family of control methods for bilateral teleoperation that guarantee stability by ensuring no part of the human-robot loop injects net energy, even over delayed communication channels.

Password

A password is a secret value a system checks to authenticate a user, dating to MIT's CTSS in 1963 and now governed by NIST guidance.