Categories - Renewable Energy

Sub Categories

Topics

solar-cells, geothermal, wave-energy, wind-turbines, pvoutput, boundary-element-method, seabirds, offshore-wind, exascale-computing, ecp, migratoryspecies, collision-risk, geothermal-energy, modelica-library, process-simulation, openmdao, scada, fault-detection, sunsynk, deye, inverter, rotorcraft, aircraft, amrex, aerodynamics, bifacial, aeroelasticity, offshore-wind-platforms, potential-flow, raytracing, openfoam, optics, balkonkraftwerk, wind-power, marine-renewable-energy, mass-flow, repair, reuse, solcast, wind-farm, cloud-motion-prediction, generative-models, photovoltaic-power, probabilistic-solar-forecasting, stochastic-video-prediction, sky-images, amr, operations-maintenance, simpy, dweet, freeboard, modbus-sungrow, sungrow-inverter, custom-cards, mhkit, ocean-wave-energy-converters, potential-flow-theory, wave-structure-interaction, borefields, sizing, deeplabv3, deepsolar, inception-v3, network-planning, neurips-2020, pv-systems, solar-panels, compliance, low-carbon-systems, water-wave, photovoltaics-dashboard, circularity, circularity-metrics, lifetime, heat-capacity, molecule, solubility, surface-tension, thermal-conductivity, vapor-pressure, viscosity, halide-ion-migration, perovskite-solar-cells, solax, non-governmental-organization, scr-1647, simulink, wec-sim, detection-boxes, detector-model, keras, model-detection, photovoltaic-panels, yolo3, heatexchanger, unsupervised-machine-learning, hut23-425, energy2d, finite-difference-time-domain, multiphysics, scr-2490, bioreactor, inverse-modelling, meshing, hoymiles, solenso, tsun, beam-irradiance, flight-simulation, sun-position, degradation, duramat, photovoltaic-systems, pv-modules, scr-1551, aeronautics, structural-dynamics, structures, scr-2609, snl-visualization, defects, electronic-structure, materials-design, semiconductors, scr-2927, cheminformatics, density, equation-of-state, aeroacoustics, subsurface-hydrology, subsurface-remediation, home-assistant-integration, huawei, huawei-solar, modbus-rtu, modbus-tcp, solar-concentrating-systems, sofar, sol-ark, solarman, solis, biochemical-process, bioprocess, biorefinery, centrifuge, distillation, fermentation, flash, heat-exchanger, unit-operation, balkonpv, ecosystem-models, phenotyping, geothermal-reservoirs, vortex-methods, vpm, vtol, radiance, actuator-line, airfoils, blade-element, turbines, chakra-ui, pv-simulator, shading-effects, borehole-image-analysis, fracture, fracture-mechanics, fractures, mplstereonet, structural-geology, carbon-sequestration, coupled-heat-mass, multiphase-transport, nuclear-waste-repositories, porous-flow, reactive-chemistry, simulation-modeling, soil-vapor, dnvgl-rp-c201, dnvgl-rp-c203, fatigue-analysis, girder, gui-based, naval-architecture, plate-thickness, plates, structural-engineering, exawind, les, low-mach, agroclimatology, agroclimatology-data, nasa-power, weather-variables, semiconductor, crne-solar, outback-mate, packets, renogy, renogy-rover, slack, slack-bot, solarthing, golem, moose-framework, boundary-element, hydrodynamic-coefficients-viewer, mesh-processing, meshviewer, irradiance, ninja, systems-engineering, wisdem, bem, bemt, propeller, rotor, ray-tracing, rigorous-coupled-wave, transfer-matrix-method, ste, analysis-framework, beam-section, buckling, cylinders, design-of-offshore-steel-structures, dnv-os-c101, dnvgl-os-c101,

Projects

Contributors

dzimmanck [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, renewable-energy, renewables, solar-energy

konstantin [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, renewable-energy, renewables, solar-energy, calendar, datetime, german, holidays, error-handling, translation and 8 more

Gael Colas [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: data-processing, advent-of-code, advent-of-code-2020, advent-of-code-2021, advent-of-code-2022

danieljfarrell [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: optics, photovoltaics, raytracing

LukasHD [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: optics, photovoltaics, raytracing

tsaoyu [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: irradiance, ninja, photovoltaic, pv, solar, reinforcement-learning

Mohammad Hosein Ronaghi [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells

Markus Führer [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells

Jeremy Cohen [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells, django-application, file-upload, filepond

Nimish Verma [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells, autodoc, integration-testing, pypi-packages, scanapi, aco, ant-colony-optimization, artificial-bee-colony and 17 more

P-Tillmann [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells

Jose Llorens [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells

Hrishikesh S [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells, machine-learning-library, nearest-neighbor-search

Jai Agarwal [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells, conda, dependencies, dependency-graph, dependency-resolution, flit, license-management, pip and 10 more

Justin Cooksey [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, semiconductor, solar-cells

Robin Wohlers-Reichel [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax, varta, varta-storage, public-transport, rfid, tfnsw

Petru Paler [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax, varta, varta-storage, agriculture, crops, drupal, equipment, livestock and 9 more

Khalid Eldehairy [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax

Rupert Nash [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax, adios, ecp, exascale, exascale-computing, hdf5

Pedro Simoes [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax

JJ Macalinao [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax

Arne Mauer [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, solax, varta, varta-storage

John Pye [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: modelica, modelica-library, optimisation, solar, thermodynamics

yewang726 [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: modelica, modelica-library, optimisation, solar, thermodynamics

arfontalvo [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: modelica, modelica-library, optimisation, solar, thermodynamics

devsjc [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: nowcasting, pvoutput, solar

Sprague [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Markus Friedrich [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine, academic-project, algorithmic-differentation, code-generation, derivatives and 9 more

ttran18 [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Andrew Platt [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Rei Landsberger [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Hall [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Kelsey Shaler [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Mertz [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

rdamiani [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Tim McCoy [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Platt [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: aeroelasticity, wind, wind-energy, wind-farm, wind-power, wind-turbine

Mary Bennett [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics:

unknown [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Bortolotti [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Frederik Zahle [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

badeshiben [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Evan Gaertner [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Bortolotti [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Quick [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Frederik Zahle [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Pietro Bortolotti [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Pietro Bortolotti [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Peter Graf [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

Nikhar Abbas [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

National Renewable Energy Laboratory [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem, api-gateway, api-management, api-manager, lua, luajit, openresty

Evan Gaertner [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: openmdao, systems-engineering, wind, wisdem

unknown [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

Tadatoshi Takahashi [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

Jonathan Goncalves [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

Aramis [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

Ogden [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

Mirletz [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: circular-economy, circularity, circularity-metrics, lifetime, mass-flow, photovoltaics, recycle, reliability, repair, reuse and 1 more

Heather Mirletz [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: circular-economy, circularity, circularity-metrics, lifetime, mass-flow, photovoltaics, recycle, reliability, repair, reuse and 1 more

Rachel Woods-Robinson [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: circular-economy, circularity, circularity-metrics, lifetime, mass-flow, photovoltaics, recycle, reliability, repair, reuse and 3 more

Gabriel Miranda [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: biochemical-process, bioprocess, biorefinery, centrifuge, chemical-engineering, distillation, fermentation, flash, heat-exchanger, life-cycle-assessment and 8 more

Brenda [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: biochemical-process, bioprocess, biorefinery, centrifuge, chemical-engineering, distillation, fermentation, flash, heat-exchanger, life-cycle-assessment and 8 more

Miguel Rivera [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: defects, electronic-structure, materials-design, semiconductors, solar-cells, materials-informatics, materials-science, materials-screening

Puck van Gerwen [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: defects, electronic-structure, materials-design, semiconductors, solar-cells

Sunghyun Kim [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: defects, electronic-structure, materials-design, semiconductors, solar-cells

agoude [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: actuator-line, airfoils, blade-element, openfoam, turbines, wind-energy

Biel Cardona [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

DESKTOP-LRQ82SM\uib [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

bielcardonatests [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics:

Nicholas F. Baker [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:

Nick Baker [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:

Eric Lee [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics:

Jared J. Thomas [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Wind Energy
Topics: computational-fluid-dynamics, differentiable-physics-engine, hydrodynamics, reinforcement-learning, reinforcement-learning-environments

Alexandr Vasilyev [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Geothermal Energy
Topics: chemical-engineering, cheminformatics, chemistry, combustion, density, environmental-engineering, equation-of-state, heat-capacity, molecule, physics and 7 more

Kobi Felton [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Geothermal Energy
Topics: chemical-engineering, cheminformatics, chemistry, combustion, density, environmental-engineering, equation-of-state, heat-capacity, molecule, physics and 16 more

Tuomo Keskitalo [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Geothermal Energy
Topics: chemical-engineering, cheminformatics, chemistry, combustion, density, environmental-engineering, equation-of-state, heat-capacity, molecule, physics and 14 more

Irene Wallis [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Geothermal Energy
Topics: borehole-image-analysis, fracture, fracture-mechanics, fractures, geology, geomechanics, geothermal, mplstereonet, structural-geology, thermodynamics and 2 more

Bulbul Ahmmed [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Geothermal Energy
Topics: geothermal, unsupervised-machine-learning

Carl Crott [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait, climate-science, ecosystem-science, land-use

Patrick Mulrooney [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait

Jimmy Chen [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait

robbenyang [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait

MarvinJ [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait

udaysaraf [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait

Chris Black [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Bioenergy
Topics: agriculture, crops, ecosystem-models, pecan, phenotyping, plants, trait, visualisation, commonmark, converter and 6 more

Raymond Hickey [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar

Chetan Chaudhari [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar

Mark Mikofski [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Photovoltaics and Solar Energy
Topics: photovoltaic, solar, anaconda, anaconda-distribution, ide, language-server-protocol, qt, spyder, winpython, units

akeeste [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

dforbush2 [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

Michael Lawson [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

Bradley A. Ling [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

jleonqu [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

j-vanrij [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

Lily Nguyen [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

crobarcro [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, julialang, numerical, programming-language, scr-1647

emiliofa [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

sedwardsand [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

Aquaharmonics [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, scr-1647

zmorrell-sand [email protected]

OST Projects: 1
Categories: Renewable Energy
Sub Categories: Hydro Energy
Topics: hydrodynamics, marine-renewable-energy, simulink, snl-applications, wave-energy, wec-sim, wdrt, scr-1647