Technology and the built world

Sepetiba Bay FSRU

The Sepetiba Bay FSRU is a floating LNG import terminal at Itaguaí in Rio de Janeiro state, Brazil, owned by KARMOL, operated by Karpowership, and operating since 2022.

Sepia Leste Oil and Gas Field

Sepia Leste is a pre-salt oil and gas field in the Santos Basin, offshore Brazil, with an estimated 130 million barrels of oil equivalent recoverable.

Sepia Oil and Gas Field

Sepia (Sépia) is a giant pre-salt oil and gas field in the Santos Basin, about 200 km offshore Rio de Janeiro, Brazil, producing through the FPSO Carioca since 2021.

SEPIC converter

A SEPIC (single-ended primary inductance converter) is a DC-to-DC converter topology that produces an output voltage higher or lower than its input, with non-inverting polarity.

Seplat Energy

Seplat Energy is a Nigerian independent oil and gas company headquartered in Lagos, listed on the Nigerian and London exchanges, supplying gas for power generation in Nigeria.

Oct 10, 2026

Sepp Hochreiter

Sepp Hochreiter (Josef Hochreiter) is a German computer scientist who identified the vanishing gradient problem in 1991, co-invented LSTM, and now leads machine learning research at JKU Linz.

SEPTA, the Southeastern Pennsylvania Transportation Authority, is the public transit agency serving Philadelphia and its surrounding counties, operating subways, buses, trolleys, and commuter rail since 1964.

SEPTA Metro

SEPTA Metro is the unified brand for SEPTA's frequent, around-the-clock rail network in Philadelphia, grouping six lettered and color-coded lines including the L, B, and trolleys.

September 2026 AI stock selloff

The September 2026 AI stock selloff was a worldwide drop in AI-linked stocks beginning 14 September 2026, after leading AI lab CEOs called for slowing AI development.

Septic drain field

A septic drain field, also called a leach field, is the part of an onsite septic system where perforated pipes release effluent into soil that filters it before it reaches groundwater.

Septic tank

A septic tank is a buried, water-tight container that treats household wastewater on site, settling solids as sludge, floating grease as scum, and draining effluent to a soil drainfield.

Sepulveda Dam

Sepulveda Dam is a 1941 flood-control dam on the Los Angeles River in the San Fernando Valley, built and operated by the U.S. Army Corps of Engineers.

Seq2seq model

A seq2seq (sequence-to-sequence) model is a neural network architecture that maps variable-length input sequences to variable-length outputs, using an encoder and decoder, applied in machine translation and speech recognition.

Sequence diagram

A sequence diagram, also called a system sequence diagram or event-trace diagram, is a UML interaction diagram showing message exchanges between objects or actors, arranged with time running down the vertical axis.

Sequence mining

Sequence mining, also known as sequential pattern mining, is a data mining method that finds frequently occurring subsequences in ordered data such as customer transactions, clickstreams, and biological sequences.

Sequence parallelism

Sequence parallelism (SP) is a distributed-training technique that splits a transformer's sequence dimension across multiple devices, letting models train on very long sequences such as the 1-million-token contexts demonstrated by DeepSpeed-Ulysses.

Sequence-level knowledge distillation

Sequence-level knowledge distillation (Seq-KD) is a model-compression technique that trains a smaller student model on complete sequences generated by a larger teacher, introduced by Kim and Rush in 2016.

Sequence-to-sequence learning

Sequence-to-sequence learning (seq2seq) is a machine learning approach in which an encoder and decoder neural network map input sequences to output sequences of different lengths.

Sequencing batch reactor

A sequencing batch reactor (SBR) is a wastewater treatment process in which aeration, reaction, settling, and decanting occur sequentially in one tank, treating municipal and industrial wastewater.

Sequential consistency

Sequential consistency is a memory consistency model in which all processors' operations appear to run in one sequential order, defined by Leslie Lamport in 1979.

Sequential manual transmission

A sequential manual transmission is a manual gearbox that selects gears only in order, one step up or down, using a ratcheting drum instead of an H-pattern.

Sequential minimal optimization

Sequential minimal optimization (SMO) is an algorithm introduced by John Platt in 1998 for training support vector machines by solving small two-multiplier quadratic programming subproblems analytically.

Sequential pattern mining

Sequential pattern mining is a data mining method that discovers frequent ordered sequences of events in sequence databases such as customer purchase histories and event logs.

Sequential recommendation with deep learning

Sequential recommendation with deep learning predicts the next item a user will interact with from their ordered, timestamped interaction history; self-attention models such as SASRec (2018) dominate benchmarks.

Sequin

A sequin is a small, shiny disc sewn onto fabric as a decoration, catching the light; among the oldest clothing ornaments, descending from ancient Egyptian gold plates.

Sequoyah nuclear power plant

The Sequoyah nuclear power plant is a two-unit nuclear power station operated by the Tennessee Valley Authority near Soddy-Daisy, Tennessee, about 9.5 miles northeast of Chattanooga.

SERA (Ai2 Open Coding Agents)

SERA (Soft-verified Efficient Repository Agents) is a family of open-weight coding-agent models released in 2026 by the Allen Institute for AI, built on Qwen 3 and licensed under Apache 2.0.

Seraglio

A seraglio, also spelled seray or serail, is the women's quarters, or harem, of a Muslim house or palace, and formerly named the Sultan's palace at Constantinople.

Oct 22, 2026

Serampore Mission Press

The Serampore Mission Press was a Baptist printing press in Danish-ruled Bengal from 1800 to 1855, established by William Carey and known for cutting Bengali and Devanagari type.