Categories - Energy Systems
Sub Categories
- Global and Regional Energy System Models - 16 projects
- Building Energy Monitoring - 20 projects
- Grid Analysis and Planning - 30 projects
- Energy Policy - 4 projects
- Energy System Modeling Frameworks - 90 projects
- Energy Markets - 9 projects
- Grid Management and Microgrid - 18 projects
- Renewable Energy Integration - 21 projects
- Energy Data Accessibility and Integration - 37 projects
- Load and Demand Forecasting - 10 projects
Topics
energy-system-model, power-flow, pypsa, loadflow, optimal-power-flow, power-systems-analysis, power-grids, capacity-expansion-planning, microgrid, power-system-analysis, nrel, powersystem, power-system, power-network, load-flow, gym-environments, matpower, milp, adequacy, cim, oemof, powersystems, electrical, energy-management-systems, renewable-timeseries, state-estimation, newton-raphson, bilan, clean-energy, potentials, co-simulation, smart-grids, times-model, mathematical-modelling, sequential-decision-making-problems, gymnasium, minigrid, eia-api, smart-grid, efficiency, powsybl, energy-management, power-system-dynamics, short-circuit, optimisation-model, modelling-framework, tyndp, demand-flexibility, energy-modelling, osemosys, oep, rte, previsionnel, electricity-consumption-forecasting, npps, energy-information-administration, modelling-tool, modular, energy-planning, energy-systems-modelling, groovy, ireland, extensible, marktstammdatenregister, snakemake-workflow, openmodelica, market, sector-coupling, power-supply, great-britain, electricity-consumption-analysis, off-grid, free-libre-open-source-software, free-and-open-source-software, computer-aided-design, solar-system, glpk, energy-models, earth-osm, glow, esphome, wma, sma, ses, rnn, lstm, gru, electric-load-forecasting, arima, times, optimization-model, integrated-markal-efom, bottom-up-model, monophased, islanding, ignite-cli, grid-system, eolian, cosmos-sdk-proto, 3-phases, 3-phase-inverter, typical-periods, aggregation, rts, worldbank-gost, labor, gender, user-defined-control, synchronous-machine, stability, psp-ufu, industry-aplication, harmonics, graphical-user-interface, power market model, public-lighting, oslp, iec61850, dlms, distribution-automation, cucumber-tests, hardware-designs, emonpi, v2s, v2h, v2g, v2b, smart-charging, ev-integration, bidirectional-charging, smart-home, octopus-energy, nx, green-energy-hub, energy-origin, open source model, GAMS, energy transition, electricity market modelling, high-resolution, virtual-sensors, metering, consumption, minlp, electricity-networks, active-network-management, transient-stability, simulator-automation-server, simauto, pythran, powerworld-simulator, powerworld, graph-analysis, contingency-analysis, springframework, kaggle-competition, kaggle, clcpa, transmission-grid, planning-tool, distribution-grid, klu, agent-based-simulation, tegola, maplibre-gl-js, imposm3, villas, students, investment, energy-planners, esdl, energy-transition-calculation, energy-information, description-language, nuclear, energy-flexibility, energy-demand-forecasting, energy-demand, electricity-load, free-datasets, costs, urban-heat-island, energy-optimization-model, distribution-shift, powergrid-operation, grid2op, rhdf5, datamodel, dispatch, power-stations, openadr, lf-energy, nyiso, newyork, kaggle-dataset, reopt-api, voltage-drop-analysis, short-circuit-analysis, pandapower, electrical-systems, electrical-system, electrical-schematics, electrical-rules-check, electrical-networks, electrical-network-analysis, coordination-study, iec61970, cim-import, cim-export, open-energy, oedi, datalake, testbed, software-in-the-loop, substations, timedomain, small-signal, modeling-dae, eigenvalue-analysis, andes, stochastic-simulation-algorithm, manipulatewidge, electric, dygraphs, myenergi, green-energy, ev-charging, heat-pump, dynamic-line-rating, matpower-github, bulma-css, reoptjl, reopt-lite-api, eigen3, lovelace-card, cgmes, spine-toolbox, miniconda, anaconda, very-large-scale-systems, tight-and-compact-formulation, power-to-hydrogen, network-constrained-unit-commitment, integrated-resource-planning, hydro-cascade-basins, hourly-resolution, generation-storage-networks-investments, energy-storage-systems, dynamic-investment-decisions, dc-power-flow, gridlabd, agent-based, flexibility-modeling, standalone-software, renewable, flexibility, balancing, three-phase, multiphase, multi-phase, 3-phase, 2-phase, pypsa-earth, pypsa-africa, power-system-planning, power-system-model, operational-optimization, investment-optimization, energy-system-planning, stateestimation, shortcircuit, renewable-resources, n-1-criterion, electricity-supply, economic-dispatch, dispatchable-units, dc-flow, transactive-energy, smartgrid, power-simulator, FAME, microgrid-model, pycaret, policy, data visualization, time-series-aggregation, representative-days, k-medoids-clustering, k-means-clustering, energy-forecasting, municipal-software, greenbutton, green-button, energy-usage, download-my-data, connect-my-data, time-of-use-tariff, electric-vehicle-charging-station, solarnode, solarnetwork, plugin-architecture, osgi, mbus, loxone, energy-generation, canbus, water-energy-nexus, unit-commitment, eia860, ddj, cems, process-systems-engineering, system, hypervision, alerting, calliope-models, quasi-stationary, emt, electromagnetic-transient, dynamic-phasors, linopy, stochastic-power-flow, multi-terminal, latin-hypercube, comon-information-model, acdc, decarbonisation, hierarchical-clustering, slimmemeter, slimme-meters, nifi-processors, nifi, dsmr-parser, dsmr, power-system-stabilizer, power-system-stability, power-system-dynamic-modeling, power-grid, gridcal, mixed-integer-linear-programming, environmental, pudl, natural-gas, ferc, etl, eia923,
Projects
Contributors
Knueven [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
energy-system, milp, minlp, power, powerflow, snl-applications, snl-science-libs
Torio [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Diana Maldonado [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Keno Oltmanns [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Meike Kühnel [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Maldonado Castro, Diana Teresa [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Hancock, Cody [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
gaik_na [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
von Rüden [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
96gunna [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
climate-change, environmental, plotly
Wilson González Vanegas [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
matpower, matpower-github
polyfloyd [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
glsl, glslviewer, raytracing, shadertoy, fritz-box, fritzbox, lua, upnp, model-predictive-control
aravindb24 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
climate-change, environmental, plotly
Luke Kiernan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
powersystems, simulations
rompic [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
mattermost
ll-ara [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
energy-system-modelling, energy-systems, modelling-framework
leostimpfle [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics:
Jiro Matsuzawa [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics:
viktoria.Illyes [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
energy-system-model
JoshuaRivera209 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
climate-change, environmental, plotly
paulapreuss [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
energy-system, modelling-framework
Marlon Fleck [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
oemof, capacity-expansion-planning, clean-energy, climate-change, electrical-engineering, energy-system, energy-systems, linopy, loadflow, optimal-power-flow and 8 more
Reedy [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
emoncms, symfony, symfony-component, contract, service, symfony-contract, dotenv, abstractions, contracts, decoupling and 20 more
Arthur Chan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
fuzz-testing, fuzzing, oss-fuzz, stability, vulnerabilities, cloud-computing, compliance, gcp, lambda, rules-engine and 9 more
Ray Kinsella [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
emoncms, openenergymonitor, sustainability
Valery De Smedt [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
node-serialport, nodebots, robot, serial, serial-ports, serialport, emoncms, openenergymonitor, sustainability
Pydrex [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
ev-charging, green-energy, myenergi
Dillard Robertson [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
energy-system, milp, minlp, power, powerflow, snl-applications, snl-science-libs, mathematical-programming, modeling-language, nonlinear-programming
mdb17 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
consumption, hacs, metering, power, virtual-sensors
hazem-ieg [email protected] config --global user.email [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models, Regional Energy System Models
Topics:
energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis
lschmeling [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Patrik Schönfeldt [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Patrik Schönfeldt [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Turhan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Patrik Schönfeldt [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Fernando Penaherrera [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Martin Krisch [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Vamsipriya22 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Load and Demand Forecasting
Topics:
Bernard Knueven [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
energy-system, milp, minlp, power, powerflow, snl-applications, snl-science-libs
cschau-ieg [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models, Regional Energy System Models
Topics:
energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis
Bruce J Palmer [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics:
Kadlec [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
nrel, renewable-energy, reopt-api, reopt-lite-api, reoptjl
Ole Mussmann [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
anaconda, miniconda, simulation-model, spine-toolbox
haz43975 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models, Regional Energy System Models
Topics:
energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis
Anas Bahr [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
dynamic-phasors, electromagnetic-transient, emt, power-systems, powerflow, quasi-stationary
Benoît Vinot [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
asynchronous, smart-grids, 3-phase, load-flow, loadflow, newton-raphson, power, powerflow, state-estimation, system and 11 more
Ali Hamdan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
3-phase, load-flow, loadflow, newton-raphson, power, powerflow, state-estimation, system, three-phase, 2-phase and 4 more
user [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Global and Regional Energy System Models, Regional Energy System Models
Topics:
energy-system-model, energy-system-planning, investment-optimization, operational-optimization, power-system-model, power-system-planning, pypsa-africa, pypsa-earth, scenario-analysis
James Jefferies (ShedCode) [email protected]
OST Projects: 1
Categories: Energy Systems, Sustainable Development
Sub Categories: Education, Energy Monitoring and Management, Grid Management and Microgrid
Topics:
bath, school
Bernard Knueven [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
energy-system, milp, minlp, power, powerflow, snl-applications, snl-science-libs
Anya Castillo [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
energy-system, milp, minlp, power, powerflow, snl-applications, snl-science-libs
Anthony Williams [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Wouter Terlouw [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Charlotte vm [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Robert Terwel [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Josh [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
climate-change, environmental, plotly
Thais Varella [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
hemiceni [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
consumption, hacs, hue-lights, metering, power, virtual-sensors
Charlotte vm [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Charlotte vm [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Dennis Schoenmakers [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Starke [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
Knueven [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
energy-system, milp, minlp, power, powerflow, snl-applications, snl-science-libs
Michiel den Haan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Roos de Kok [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Nikki Brormann [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
José Ignacio Zapata Fuentealba [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Markets, Energy Modeling and Optimization
Topics:
mathematical-programming, modeling-language, nonlinear-programming
Jasa [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
marvinheintze [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Grid Analysis and Planning
Topics:
agent-based-simulation, energy-transition, powersystem, research
garbaylouis [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
energy-system, power-system-simulation, power-systems, power-systems-analysis
Robin Grether [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Data Accessibility and Integration
Topics:
phumthep [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
dc-flow, dispatchable-units, economic-dispatch, electricity-supply, n-1-criterion, power-system-analysis, renewable-resources, substations, unit-commitment, water-energy-nexus
Joijanae Laws [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
climate-change, environmental, plotly
Fernando Fachini [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
energy-system, energy-system-modeling, gridcal, modelica, power-grid, power-grids, power-system-dynamic-modeling, power-system-dynamics, power-system-simulation, power-system-stability and 4 more
Nischita Nannapaneni [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring
Topics:
climate-change, environmental, plotly
juangutierrez [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
climate-change, environmental, plotly
HarmonicReflux [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
decarbonisation
Minshu Deng [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy Policy
Topics:
Marie Fischer [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
loadflow, power, powerflow, short-circuit, state-estimation, system
Mads Magnus Due [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
Alexander [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
Martin Schmidt [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
AFY [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
Kristian Bank Erbou [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
Jan Duelund [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
Niels Jorck Worm [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx
Lars Gyrup Brink Nielsen [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Management and Microgrid
Topics:
energy-origin, green-energy-hub, nx, mutation-testing, stryker, test-automation, testing-tools, sanitization, sanitize, validations and 10 more
Chris [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Sebastian Struß [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Georg Z. [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Normann [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Dominik Siebel [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Bobby Noelte [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Dominique Lasserre [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Jakob Moecke [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
BerndCzech [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Andreas [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy System Modeling Frameworks
Topics:
Dakota Ramos [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Renewable Energy Integration
Topics:
joda9 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Distribution and Grids, Grid Analysis and Planning
Topics:
clairetrevisan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy Policy
Topics: