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Pyrolytic carbon
Pyrolytic carbon is a carbon material deposited from gaseous hydrocarbons on substrates at 1000 to 2500 K, used in nuclear fuel particles and mechanical heart valves.
Pyrolytic graphite
Pyrolytic graphite is a highly oriented form of graphite made by chemical vapor deposition, with thermal and electrical properties that differ sharply along and across its layers.
Pyrometallurgical recycling
Pyrometallurgical recycling is a battery recycling method that smelts spent lithium-ion batteries above 1200 °C to an alloy, recovering over 95% of cobalt, nickel, and copper.
Pyroprocessing
Pyroprocessing, or electrometallurgical processing, is a family of molten salt reprocessing technologies that treat spent nuclear fuel to recover uranium and transuranic elements for reuse.
Pyrotechnics
Pyrotechnics is the science and craft of creating exothermic chemical effects such as light, color, sound, and smoke, covering fireworks, film special effects, signal flares, and safety devices like airbags.
PySCF
PySCF (Python-based Simulations of Chemistry Framework) is a free, open-source quantum chemistry package for electronic structure calculations on molecules and periodic solids, begun by Qiming Sun.
pytest
pytest is a testing framework for Python, born in the PyPy project and first released in 2008, known for plain assert statements, a fixture system, and more than 1,300 plugins.
Pythia (model family)
Pythia is a suite of 16 open-source language models released by EleutherAI in 2023, ranging from 70M to 12B parameters, with 154 training checkpoints per model for studying how models learn.
Python (programming language)
Python is an interpreted, high-level programming language created by Guido van Rossum and first released in 1991, prized for readable syntax and widely used in web development and data science.
Python (פיתון) (missile)
The Python is a family of short-range infrared-homing air-to-air missiles developed by Israel's Rafael Advanced Defense Systems since the 1980s, including the imaging-infrared Python-5, used in combat in 2006.
Python 5
Python 5 is a fifth-generation short-range air-to-air missile made by Israel's Rafael, with an imaging infrared seeker that locks on after launch for full-sphere engagement, and it also equips the SPYDER air defense system.
Python Package Index
The Python Package Index (PyPI) is the principal repository of software packages for the Python programming language, operated by the Python Software Foundation and installed with pip.
Python pickle
Python pickle is the standard Python module for serializing Python objects into byte streams; designed in 1995, it handles nearly any Python type but only Python can read it.
Python Software Foundation
The Python Software Foundation, or PSF, is a US nonprofit charity founded by Guido van Rossum in 2001 that holds Python's intellectual property and supports the Python community.
PyTorch
PyTorch is an open-source Python library for tensor computation with GPU acceleration and deep neural networks, launched in January 2017 and now a primary platform for AI research.
PyTorch Lightning
PyTorch Lightning, installable as the lightning package, is an open-source PyTorch wrapper whose Trainer automates training loops, logging, and scaling from 1 to thousands of GPUs.
PZL M-15 Belphegor
The PZL M-15 Belphegor, also known as the PZL-Mielec M-15, was a jet-powered crop-spraying biplane built in Poland, the only production jet biplane ever made.
PZL M28 Skytruck
The PZL M28 Skytruck, also known as the PZL M-28, is a Polish twin-engine turboprop STOL utility transport, a Westernized development of the Antonov An-28.
PZL Mielec
PZL Mielec, also known as WSK-Mielec, is a Polish aircraft and helicopter manufacturer in Mielec, Poland, known for the M28 aircraft and S-70i Black Hawk helicopter.
PZL P.11
The PZL P.11 was a Polish fighter aircraft of the 1930s, the main fighter of the Polish Air Force during the German invasion of September 1939.
PZL TS-11 Iskra
The PZL TS-11 Iskra is a Polish two-seat jet trainer, the first Polish jet aircraft, which first flew in 1960 and served the Polish Air Force for over half a century.
Q (New York City Subway service)
The Q, or Brighton Local via Broadway Express, is a New York City Subway service from 96th Street on Second Avenue to Coney Island–Stillwell Avenue, Brooklyn.
Q code
The Q code, also known as a Q signal, is a standardized three-letter abbreviation for radiotelegraph phrases, developed by Britain around 1909 and internationally adopted in 1912.
Q-Former (querying transformer)
The Q-Former, or Querying Transformer, is a small BERT-initialized adapter introduced in BLIP-2 in 2023 to compress image features into 32 tokens for a frozen language model.
Q-learning
Q-learning is a model-free reinforcement learning algorithm in which an agent learns to act optimally by trial and error, introduced by Christopher Watkins at Cambridge in 1989.
Q-ship
The Q-ship, also known as a Q-boat, was a warship disguised as an unarmed merchant vessel, used by the British and French navies from 1914 to destroy submarines.
Q-switching
Q-switching is a laser technique that concentrates stored energy into a single intense nanosecond giant pulse, proposed by Hellwarth in 1961 and used in rangefinders, lidar, and marking.
Q'eswachaka Bridge
Q'eswachaka is a rope suspension bridge over the Apurímac River in Cusco, Peru, rebuilt each year with plant fiber using Inca techniques, recognized by UNESCO in 2013.
Q1 (building)
Q1, short for Queensland Number One, is a 322.5-meter residential skyscraper in Surfers Paradise on Australia's Gold Coast, completed in 2005 and the tallest residential building in the Southern Hemisphere.
Q2 (company)
Q2 Holdings, Inc. is an Austin, Texas-based financial technology company, founded in 2004, selling cloud-based digital banking and lending software to banks and credit unions.