asteroza + wave   219

Observation of surface wave patterns modified by sub-surface shear currents | Journal of Fluid Mechanics | Cambridge Core
Kelvinangle may not always be 37 degrees in the presence of shear layers. This has applications in boat wake theory, with implications for fuel efficiency as well as maritime ocean surveillance in littoral waters
hydrodynamics  boat  wake  kelvin  angle  fluid  dynamics  research  surface  wave  pattern 
23 days ago by asteroza
Seatricity | Wave Energy
A seawater pumping wave point absorber power generator
wave  power  generator  buoy  seawater  water  pump 
april 2019 by asteroza
Aster Thermoacoustics
Interesting work on both thermoacoustic heat sources and matched bidirectional turbines for electrical power generation. Thermoacoustic electrical generators previously used linear alternators, but those prefer faster cycles, which is opposite what the thermoacoustic wants (parts sizing goes up unfavorably when scaling), and slower long stroke linear alternators also have issues (long piston stroke, sealing issues). Using a rectifying bidirectional turbine may be a convenient workaround.
EU  europe  holland  thermoacoustic  research  acoustic  wave  rectifying  bidirectional  turbine  power  generator  cooling  waste  heat  recovery 
february 2019 by asteroza
CalWave | Converting Waves into Electricity and Freshwater
Some sort of "wave carpet" planar absorber located below waves, emulating the damping ability of muddy sea bottoms.
wave  carpet  energy  converter  absorber  power  generator  marine  offshore  research  technology 
october 2018 by asteroza
Development and Short-Range Testing of a 100 kW Side-Illuminated Millimeter-Wave Thermal Rocket
So Parkin and crew as part of the MTLS project got to phase 2, demoing a millimeter wave beamed thermal rocket launch. Some reports are 33kW received rather than 100kW though
microwave  millimeter  wave  beamed  thermal  propulsion  rocket  space  research  technology 
may 2018 by asteroza
Waves power | Spain | Arrecife Systems
What's the power conversion system exactly? Claims electric and flywheel, but what is it?
ocean  wave  power  generator  HAWT  savonis  turbine  lateral  horizontal 
may 2018 by asteroza
Continuous-wave room-temperature diamond maser | Nature
A step up from that organic crystal maser, which was materials limited to pulse ops
room  temperature  continuous  wave  maser  materials  science  research  technology  physics  optics  oscillator  diamond  laser  pumped  defect  vacancy 
april 2018 by asteroza
FALCON reactor-pumped laser description and program overview (Conference) | SciTech Connect
This is circa 1989-1991, and seems to feel a single laser/reactor complex can get to 100MW and have higher efficiency. Though beam quality will be an issue due to gas gain medium.
nuclear  pumped  continuous  wave  laser  reactor  fission  fragement 
december 2017 by asteroza
Carnegie Clean Energy
Formerly did raw seawater pumping to shore, but the friction losses apparently were insurmountable, and the latest design has a wave pump driven hydraulic motor running an electrical generator within the buoy for PTO.
CETO  wave  green  energy  point  absorber  buoy  power  generator 
july 2017 by asteroza
josephg/ShareJS: Collaborative editing in any app
made by an ex-google wave developer, so based on operational transforms, which were sorta used in wave
operational  transform  collaborative  text  editing  javascript  library  node.js  realtime  wave  collaboration  editor  share  Delicious 
may 2017 by asteroza
A half-wave rectified alternating current electrochemical method for uranium ext...
New tweak on seawater uranium extraction, by charging the capture medium to collect more ions. Not totally passive compared to previous methods though as a result.
half  wave  AC  electrochemical  seawater  uranium  extraction  materials  science  research  technology  Delicious 
february 2017 by asteroza
Tactical Undersea Network Architectures (TUNA)
RF relay buoys using a self-deploying wave energy power generator, and short term fiber optic submarine cables (30 days) which are very lightweight
RF  wireless  relay  communication  network  buoy  wave  energy  power  generator  military  temporary  Delicious 
january 2017 by asteroza
Traveling-wave thermoacoustic refrigerator driven by a multistage traveling-wave...
Can operate on sub-300C heat pretty well, so suitable for waste heat/bottoming cycle applications.
multistage  regenerator  traveling  wave  thermoacoustic  engine  refridgerator  cooling  Delicious 
december 2016 by asteroza
OSA | Luminescent detector for free-space optical communication
Facebook improving fresspace lasercomm receivers by doping optical waveguides with frequency shifter dyes to catch scintillation diffracted laser light for a wide field of view.
scintillation  effect  compensation  flourescence  flourescent  dye  doping  luminescent  concentrator  optical  fiber  wave  guide  waveguide  detector  large  FoV  optics  materials  science  research  technology  facebook  freespace  laser  communications  lasercomm  receiver  Delicious 
july 2016 by asteroza
High Speed Boat | Offshore Power Boat
Boat, based on waterski planing concepts to reduce drag. But isn't this actually just a planing wave piercing SWATH pontoon boat in principle though?
sea  skimmer  water  skiing  seaski  planing  pontoon  SWATH  catamaran  hull  boat  ship  vessel  vehicle  transportation  wave  piercing  piercer  australia  Delicious 
december 2015 by asteroza
Terahertz-driven linear electron acceleration : Nature Communications : Nature Publishing Group
Interesting new take on linear accelerators, possible x100 improvement leading to free electron x-ray lasers...
terahertz  RF  wave  linear  particle  electron  accelerator  physics  research  technology  hardware  electronics  devices  Delicious 
october 2015 by asteroza
Azura Wave
Actually made by EHL and some other group in New Zealand
Azura  wave  energy  power  generator  green  ocean  Delicious 
july 2015 by asteroza
Wave Foil Developments
Basically wave glider parts mounted on the bow of a commercial ship. Sure, it probably works at reducing drag/increasing performance, but how would you deal with the draft increase? Retractable foil?
marine  architecture  ship  design  hydrodynamics  seakeeping  bow  foil  wave  glider  Delicious 
june 2015 by asteroza
M3 Wave
Er, so it uses displaced underwater air chambers with an air turbine in between to generate power, so this seems best where wave direction is largely known.
wave  power  generator  seafloor  bidirectional  air  turbine  submerged  stationary  fixed  Delicious 
april 2015 by asteroza
KTH | Making waves with new gear technology
The cascade gear drivetrain that converts linear to rotary movement is kinda interesting. Though for a point absorber, it's probably the difference between a hydraulic pump's valving breaking, and this one grinding it's pinion gear teeth.
cascade  gear  pinion  linear  motion  converter  rotary  ocean  wave  power  generator  point  absorber  hardware  electronics  devices  Delicious 
february 2015 by asteroza
Fishing vessel transformed into a wave power plant
So they recycled an old fishing boat, stuffed some OWC's with wells turbines and called it a day?
ocean  wave  power  generator  OWC  offshore  Delicious 
february 2015 by asteroza
Optics InfoBase: Optica - Optical Fourier synthesis of high-repetition-rate pulses
I think this is using an array of (continuous wave?) lasers constructively interfering to create a specific custom laser pulse waveform.
arbitrary  pulse  laser  wave  waveform  shaping  optics  research  technology  shape  array  Delicious 
january 2015 by asteroza
Interesting use of a linear piston motion of a wave power buoy to drive a mechanically driven high pressure seawater pump for a reverse osmosis water desalination rig. RO requires high pressure, which typically requires a lot of electric power for a electric pump, but by using gradual pressure building using a wave driven seawater pump, you can achieve equivalent pressures. Potentially convenient for small island resorts that have very little electrical power. But the long water pipe is a bit of a problem. If it were me, I would use the wave buoy to send pressurized seawaater directly via pipe to a beach building with the RO rig and a pressure accumulator tank, since that keeps the more finicky parts out of the water.
wave  power  generator  buoy  high  pressure  reverse  osmosis  water  desalination  mechanical  pump  ocean  marine  engineering  seawater  Delicious 
december 2014 by asteroza
Wave Energy :: ALBATERN :: WaveNET
Interesting wave energy power generator design, using linkable modules. Similar to pelamis, but all the hydraulic piston stuff is done underwater it seems.
waveNET  modular  pneumatic  pump  wave  motion  power  generator  marine  renewable  green  energy  research  technology  array  hydraulic  structure  ocean  Delicious 
november 2014 by asteroza
Interesting mixed milimeter wave/IR laser freespace wireless comm link hardware. The IR laser setup used active deformable beams to counter weather.
mixed  hybrid  IR  laser  RF  millimeter  wave  wireless  communication  network  networking  hardware  electronics  devices  freespace  optical  Delicious 
november 2014 by asteroza
Recent Advances in Power Cycles Using Rotating Detonation Engines with Subcritical and Supercritical CO2
So rocketdyne has been doing interesting RDWE plasma assisted combustors, in this case intended for oxyfuel powerplants with CO2 capture
aerojet  rocketdyne  RDE  RWDE  PDE  rotating  wave  detonation  engine  pressure  rise  combustor  supercritical  CO2  combustion  cycle  oxyfuel  gas  turbine  research  technology  pulse  pulsed  plasma  assist  carbon  capture  Delicious 
november 2014 by asteroza
AOE Accumulated Ocean Energy Inc - Creating a safe, clean energy for all on Earth.
Using a wave buoy based pump to compress air for a UWCAES setup. Problem is the heat loss (since it would be hard to recover), means you lose a lot of efficiency in the CAES system. I suppose they eat the loss, since the primary power source is renewable wave energy, rather than a grid input.
UWCAES  CAES  underwater  ocean  compressed  air  energy  storage  bag  balloon  green  wave  pump  buoy  Delicious 
september 2014 by asteroza
Interesting possible trick to increasing wave energy collection via increasing collector area
wave  energy  converter  WEC  carpet  wide  area  collector  fabric  deformable  plate  transducer  power  generator  ocean  marine  research  technology  Delicious 
february 2014 by asteroza
[1312.4006] Three-dimensional Mid-air Acoustic Manipulation by Ultrasonic Phased Arrays
This has potentially manufacturing applications, if it can be used for precision placement of electronics onto PCB's without contamination if the ultrasound doesn't do any damage.
3D  midair  acoustic  object  manipulation  manipulator  touchless  contactless  ultrasound  levitation  standing  wave  node  trap  physics  research  technology  manufacturing  phased  array  speaker  audio  soundwaves  Delicious 
february 2014 by asteroza
MagnaCom - Reinventing the Evolution of Digital Communications
High end QAM sorta-compatible receiver design using non-linear tricks, pushing 10dB improvement over QAM4096, approaching Shannon limits.
WAM  QAM  QAM4096  RF  radio  wave  modulation  receiver  design  startup  communication  telecommunications  high  bandwidth  long  range  spectrum  compression  efficiency  low  power  Delicious 
december 2013 by asteroza
Gyro Wave Power Generator - Gyrodynamics Co. Ltd.
Some kind of gyro torque based power converion wave power generator, using twin coupled gyros. But if it isn't using hydraulics to convert gyro frame mount torque to pressure power, then how is it generating power? Linear solenoid actuators?
marine  japan  buoy  offshore  gyro  wave  generator  power  ocean  Delicious 
april 2013 by asteroza
Google Wave Resurrection
Google Wave sorta back from the dead?
Rizzoma  wave  google  Delicious 
december 2012 by asteroza
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