Categories - Energy Systems
Sub Categories
- Global and Regional Energy System Models - 16 projects
- Building Energy Monitoring - 20 projects
- Grid Analysis and Planning - 31 projects
- Grid Management and Microgrid - 18 projects
- Energy Policy - 4 projects
- Renewable Energy Integration - 20 projects
- Energy Data Accessibility and Integration - 37 projects
- Energy System Modeling Frameworks - 88 projects
- Energy Markets - 9 projects
- Load and Demand Forecasting - 9 projects
Topics
energy-system-model, pypsa, optimal-power-flow, power-flow, power-systems-analysis, powersystem, power-system-analysis, loadflow, microgrid, capacity-expansion-planning, nrel, gym-environments, power-system, powersystems, electrical, oemof, matpower, adequacy, milp, power-network, cim, mathematical-modelling, optimisation-model, minigrid, energy-management, energy-management-systems, eia-api, smart-grids, oep, power-grids, co-simulation, short-circuit, times-model, smart-grid, sequential-decision-making-problems, gymnasium, tyndp, demand-flexibility, clean-energy, osemosys, load-flow, bilan, efficiency, renewable-timeseries, powsybl, rte, power-system-dynamics, previsionnel, modelling-framework, potentials, grid2op, oedi, powergrid-operation, costs, datalake, anaconda, miniconda, nyiso, newyork, open-energy, kaggle-dataset, distribution-grid, planning-tool, transmission-grid, energy-optimization-model, agent-based-simulation, reopt-api, kaggle-competition, reopt-lite-api, kaggle, clcpa, reoptjl, cems, decarbonisation, matpower-github, bulma-css, datamodel, hardware-designs, emonpi, gridlabd, agent-based, iec61970, cim-import, cim-export, power-system-stabilizer, power-system-stability, power-system-dynamic-modeling, power-grid, gridcal, smart-home, octopus-energy, modular, grid-system, glow, esphome, calliope-models, timedomain, small-signal, modeling-dae, eigenvalue-analysis, andes, slimmemeter, slimme-meters, nifi-processors, nifi, dsmr-parser, dsmr, pudl, natural-gas, ferc, etl, eia923, eia860, ddj, electricity-load, virtual-sensors, metering, consumption, worldbank-gost, labor, gender, electricity-networks, active-network-management, transient-stability, simulator-automation-server, simauto, pythran, powerworld-simulator, powerworld, graph-analysis, contingency-analysis, environmental, electricity-supply, transactive-energy, smartgrid, power-simulator, microgrid-model, policy, data visualization, pycaret, time-series-aggregation, representative-days, k-medoids-clustering, k-means-clustering, hierarchical-clustering, power market model, open source model, GAMS, energy transition, electricity market modelling, energy-demand-forecasting, energy-demand, economic-dispatch, dispatchable-units, dc-flow, esdl, energy-transition-calculation, energy-information, description-language, villas, rhdf5, cgmes, stochastic-simulation-algorithm, manipulatewidge, electric, dygraphs, modelling-tool, heat-pump, dynamic-line-rating, spine-toolbox, stochastic-power-flow, newton-raphson, multi-terminal, latin-hypercube, comon-information-model, acdc, linopy, system, state-estimation, energy-flexibility, hypervision, alerting, energy-forecasting, marktstammdatenregister, water-energy-nexus, unit-commitment, substations, renewable-resources, n-1-criterion, eolian, cosmos-sdk-proto, 3-phases, 3-phase-inverter, power-supply, openmodelica, rts, mixed-integer-linear-programming, solar-system, ireland, energy-planning, market, user-defined-control, synchronous-machine, stability, psp-ufu, industry-aplication, municipal-software, tegola, myenergi, green-energy, ev-charging, FAME, snakemake-workflow, sector-coupling, great-britain, stateestimation, shortcircuit, eigen3, openadr, lf-energy, electricity-consumption-forecasting, electricity-consumption-analysis, off-grid, monophased, islanding, ignite-cli, greenbutton, green-button, energy-usage, download-my-data, connect-my-data, plugin-architecture, osgi, mbus, loxone, energy-generation, canbus, times, optimization-model, integrated-markal-efom, bottom-up-model, students, investment, energy-planners, harmonics, graphical-user-interface, free-libre-open-source-software, free-and-open-source-software, computer-aided-design, energy-information-administration, earth-osm, time-of-use-tariff, electric-vehicle-charging-station, wma, sma, ses, rnn, lstm, gru, electric-load-forecasting, arima, glpk, energy-models, maplibre-gl-js, imposm3, power-stations, nx, green-energy-hub, energy-origin, minlp, springframework, public-lighting, oslp, iec61850, dlms, distribution-automation, cucumber-tests, nuclear, npps, dispatch, electrical-schematics, groovy, extensible, process-systems-engineering, lovelace-card, quasi-stationary, emt, electromagnetic-transient, dynamic-phasors, typical-periods, aggregation, v2s, v2h, v2g, v2b, smart-charging, ev-integration, bidirectional-charging, testbed, software-in-the-loop, electrical-rules-check, electrical-networks, electrical-network-analysis, coordination-study, high-resolution, standalone-software, renewable, flexibility, balancing, distribution-shift, klu, pypsa-earth, pypsa-africa, power-system-planning, power-system-model, operational-optimization, investment-optimization, energy-system-planning, energy-systems-modelling, 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, free-datasets, flexibility-modeling, voltage-drop-analysis, short-circuit-analysis, pandapower, electrical-systems, electrical-system,
Projects
Contributors
Thomas Jankovic [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Kevin McElwee kevinmcelwee@nat-tvwna-inside-visitornet101-10-25-195-40.princeton.org
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Ubuntu [email protected]
OST Projects: 1
Categories: Emissions, Energy Systems
Sub Categories: Emission Observation and Modeling, Energy Modeling and Optimization
Topics:
unknown [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
ami-solution, open, smart-grid
root [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
ami-solution, open, smart-grid
Ubuntu [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Austin Chang [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
ami-solution, open, smart-grid
Aaron [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
ami-solution, open, smart-grid
DeniseGiub [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
contrib-readme-bot [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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, bibliography and 15 more
Emre-Yorat89 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
Fabrizio Finozzi [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
carlosfv [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
davide-f [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
Ekaterina-Vo [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
s1778303 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
unknown [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
Neto [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, 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
freddidierRTE [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
vlo-rte [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
David Binder [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
LE-GALL Ronan Ext [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
ClementBouvierN [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
LONGA Valerie [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
baptiste [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
olivierPigeon-RTE [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Amine TABOU [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Duchatelle Hubert [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
bendaoud [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
vitorg [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
bermaki [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Sami Chehade [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Gerben Danen [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Baptiste Julien [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
David Binder [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
didierfred [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
youyou [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Damien JEANDEMANGE [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
chengyli [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Amal [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
TABOU Amine Ext [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Admin Hanae SAFI [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
bengoutaeli [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
Sami CHEHADE [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
HanaeSafiRTE [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Monitoring and Management, Grid Management and Microgrid
Topics:
alerting, hypervision
trystan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Adrian Minde [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
environ [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
CDuffers [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Dave [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Erik Karlsson [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Baptiste Gaultier baptiste@ubuntu-server.(none)
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
blaal02 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Alexandre CUER [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability, calibration, electrical
Bill Thomson [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability, rfm12b, rfm12pi, rfm69cw, rfm69pi
Joe [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
brucemiranda [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability, varta, varta-storage
Robert Wilhelm [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability, code-generation, intermediate-representation, llvm, virtual-machine
tdereus [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
me [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Jerberus [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Edoardo Rivello [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
leegaard leegaard@netty.(none)
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
joe [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
EmonFan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Fabien Marchewka [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Markus Hahnenkamm [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
triek [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Ben Aylott [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability, rfm12b, rfm12pi, rfm69cw, rfm69pi, electricity-meter, serial-communication
CDuffers [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Christian Sack [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Kristo Kaasan [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
emmademareywilliams [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
casestudies [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Tobias Ohrdes [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
kiwi-wi [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability, enterprise, mediawiki, visual-editor, wiki
lechercheur123 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
mr15 [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Building Energy Monitoring, Energy Monitoring and Management
Topics:
emoncms, openenergymonitor, sustainability
Marjatta Burkhard [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
karimelbana [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Lotte van Vlimmeren [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
Joris Berkhout [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Energy System Modeling Frameworks
Topics:
wcole [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Regional Energy System Models
Topics:
scohen [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Global and Regional Energy System Models, Regional Energy System Models
Topics:
Mindermann, Kennedy [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Global and Regional Energy System Models, Regional Energy System Models
Topics:
bsergi [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Global and Regional Energy System Models, Regional Energy System Models
Topics:
cem, energy-analysis, pcm
wesleyjcole [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Regional Energy System Models
Topics:
Kelly Eurek [email protected]
OST Projects: 1
Categories: Energy Systems
Sub Categories: Energy Modeling and Optimization, Regional Energy System Models
Topics: