asteroza + efficiency   136

Multirotor wind turbine wakes: Physics of Fluids: Vol 31, No 8
multirotor wind turbines may work better than single giant ones, in this case square quadpacks on a single main pole. There's probably additional wake force effects if you have counterrotating turbines near each other too...
multirotor  wind  turbine  wake  turbulence  aerodynamic  efficiency  research  quadrotor 
8 days ago by asteroza
Researchers measure near-perfect performance in low-cost semiconductors
quantum dot efficiency is extremely high, competes with single crystal conventional semiconductors
materials  science  physcs  research  technology  quantum  dot  efficiency 
april 2019 by asteroza
If the shifting via sliding the bearing assembly up and down the drive shaft works without too much of a penalty, this might be interesting. But like most shaft drives, this would be difficult to retrofit, and probably needs a custom frame.
bike  bicycle  accessories  propulsion  pinion  shaft  drive  high  efficiency 
july 2018 by asteroza
Photosystem II Subunit S overexpression increases the efficiency of water use in a field-grown crop | Nature Communications
Single gene tweaks drops water usage by 25% but keeps yield up apparently for tobacco, should work for other plants.
GM  genetically  modified  plant  low  water  usage  efficiency  agriculture  biology  science  research  technology 
march 2018 by asteroza
Some sort of new charger, uses tricks internally to convert AC to DC at higher efficiency in a smaller package. Uses some sort of frequency multiplier to reduce the size of inductors and capacitors (some kind of VHF switching inverter?), and using air core inductors and transformers can cut down on size and weight.
small  form  factor  high  efficiency  charger  recharger  adapter  hardware  electronics  devices  power  Delicious 
january 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
IROS 2013: Should Quadrotors All Look Like This? - IEEE Spectrum
Interest variation on the Y-copter design. Claims propulsion efficiencies over traditional quadcopters, mostly through a high efficiency achieved through using larger slow blades for primary lift (long blades moving a lot of air slowly are more efficient than a fan that moves a small amount of air fast)
triquad  quadcopter  helicopter  drone  aerodymaics  propulsion  efficiency  hardware  electronics  devices  research  UAV  aviation  technology  robotics  y-copter  Delicious 
november 2013 by asteroza
10.AIAA-1984-2163-960.pdf (application/pdf Object)
I wouldn't have expect a side suction slot that ends up reversing the flow completely before it reaches the fan (360 degree flow path change) would have improved things.
technology  research  engineering  design  efficiency  high  AIAA  propulsion  reduction  drag  flow  laminar  suction  layer  boundary  aerodynamics  optimization  propulsor  Goldschmied  UAV  RPV  Delicious 
december 2012 by asteroza
Improving the light-harvesting of amorphous silicon solar cells with photochemical upconversion - Energy & Environmental Science (RSC Publishing)
New trick for solar cells, upconverting red/IR photons that are not captured in a PV cell and pass through by combining two photons and turning it into a single yellow photon, and sending that back into the solar cell for capture. Kind of like a frequency doubler crystal. But this seems to be a reflector architecture of sorts, so that means the red/IR that passed though probably heated the solar cell already before it even reaches the upconverter reflector, as opposed to a frequency doubler crystal which is on the front end usually.
photon  upconvert  upconversion  conversion  solar  cell  PV  efficiency  red  yellow  amorphous  silicon  materials  science  research  technology  power  generator  green  energy  Delicious 
april 2012 by asteroza
News releases 2012
Apparently, these guys were already working on using microbubbles to improves algae density in production. Now, they have retasked the same tech to help with floatation/separation/harvesting to ease gathering and drying, which is somewhat energy intensive normally. Naturally this assumes algae for biofuel where you are using the biomass directly (thus killing the algae), rather than using algae types the excrete oils that can be skimmed (and keep the algae alive).
high  efficiency  microbubble  aeration  system  algae  floating  floatation  density  production  biofuel  Delicious 
january 2012 by asteroza
Microwave and waste heat reformation holds prospect of improving fuel energy content and reducing CO2 - Ricardo
Using engine waste heat to heat diesel fuel, to reduce input energy requirements for a microwave diesel fuel reformer producing syngas on the fly for an engine.
Ricardo  HeatWave  recuperated  diesel  fuel  microwave  reformer  syngas  production  engine  motor  efficiency  automotive  technology  green  energy  Delicious 
september 2011 by asteroza
Device Research Laboratory
Interesting work on a high performance compact air cooled heatsink with integrated forced air blower and multi-loop condenser heatpipe arrangement
PHUMP  pumped  heat  exchanger  high  efficiency  air  dry  cooling  heatsink  low  power  fan  motor  heatpipe  impeller  small  form  factor  compact  thermal  management  research  hardware  DARPA  MACE  Delicious 
june 2011 by asteroza
Pinnacle Engines
Apparently this is different from that other major OPOC engine.
Pinnacle  engines  OPOC  opposed  piston  cylinder  engine  high  efficiency  green  Cleeves  Otto  diesel  cycle  motor  automotive  technology  Delicious 
april 2011 by asteroza
PASSIVE HOUSE JAPAN web site - 一般社団法人パッシブハウス・ジャパン
It would be nice to make this stick, but japanese have some truly strange behavior regarding building HVAC. In particular, there is the concept of "changing the air" where they will open the windows full bore, regardless of the outside weather. The other bad behavior is the near zero understanding of central HVAC, causing them to run heaters or air conditioners full bore whenever they enter a room to work/spend time in, then turn it off when they leave. Though this needs to be tempered by the fact that traditional japanese homes were poorly insulated, so there was no merit to running HVAC constantly since it was a losing battle.
japan  passive  house  green  building  standard  specification  energy  efficiency  Delicious 
june 2010 by asteroza
Green Revolution Cooling
Direct full server mineral oil immersion cooling is now possible with appropriate power supplies and SSD hard disks (rotating hard disks are actually air breathing). These guys are packing it as a 42U rack lying on it's back to allow easier single server removal, though frankly that would make a hell of a mess and it would be better to go with monolithic sealed units that fail in place...
datacenter  server  mineral  oil  direct  cooling  green  IT  energy  efficiency  Delicious 
march 2010 by asteroza
Ecomotors Opposed-Piston Opposed-Cylinder Engine Could make Class 8 Trucks 45% More Fuel Efficient
Interesting opposed piston engine concept. Each opposed piston cylinder set/module consists of pairs of inner and outer pistons. By putting the inlet and exhaust ports at opposite ends of the cylinder, you get better fuel burn, and potentially easier valve systems. Opposed setups get some nice balance going, and because it is "flat" engine you could potentially put it under the floor/bed of a vehicle rather than in the front, for better weight balance (provided you are using all wheel electric drive, which is not unreasonable since this engine concept uses an electric turbo/supercharger so you will in principle need a large generator/alternator attached to the driveshaft anyways). I wonder what would stop you from using a concept like this for a diesel cycle, since it is functionally a two stroke based cycle?
OPOC  opposed  cylinder  piston  engine  design  concept  hybrid  2  4  stroke  valveless  high  efficiency  electric  supercharger  turbocharger  ICE  green  transportation  Delicious 
march 2010 by asteroza
Successful wind tunnel test of controllable rubber trailing edge flap for wind turbine blades
Neat trick using pneumatically/hydraulically deformable rubber trailing edge flaps on wind turbine blades to control flow in gusty conditions
CRTEF  controllable  rubber  trailing  edge  flap  variable  deformable  spoiler  wind  turbine  blade  high  efficiency  control  gust  load  dump  aerodynamics  research  airfoil  Delicious 
february 2010 by asteroza
Site temporarily closed
Seems Cermetica is working on advanced high temperature titanium diboride ceramic coatings for the purpose of an advanced wankel derivative motor with high efficiency. Seems to be a continuation of research by Katherine Logan and Robert Wisner.
Cermetica  high  temperature  ceramic  titanium  diboride  materials  science  research  technology  wankel  ICE  engine  motor  efficiency  propulsion  Delicious 
october 2009 by asteroza
Spectrum-splitting solar modules and Roadmap to 50% efficient Solar Cells
Interesting continuing research into the somewhat obvious ploy of using a optical spectrum splitter to separate light frequencies and send to them frequency optimized discrete solar cells, as a way to surmount the materials science problems of making stacked multijunction multispectrum optimized solar cells. If the light from the primary concentrator is being split by frequency, I wonder if you could do the trick of sending specific light bands left/right/down by using a double prism block? There is the overriding question of whether it would be cheaper to do the beam slitting before or after the concentrator?
high  efficiency  solar  cell  power  generator  materials  optics  science  research  technology  hardware  electronics  devices  green  energy  dichroic  prism  spread  spectrum  filter  light  beam  frequency  splitter  concentrator  concentrating  parallel  array  VHESC  Delicious 
october 2009 by asteroza
Seth's Blog: Reinventing the conference call
He's suggesting a multimedia conferencing solution to improve communication. Which makes sense, considering there is the analog of the academic conference seminar with matching IRC room where attendees discuss and lampoon the speaker. I wonder if you could implement this directly via VoIP services? SIP (or should I say SIMPLE) in theory supports a form of inline chatting, provided the end client supports it. I suppose if you were really pushing for it, force the conference participants to use SIP clients exclusively, cutting out those expensive analog teleconference support services since all the audio is VoIP.
telephone  conference  call  shadow  chat  chatroom  business  productivity  collaboration  meeting  efficiency  tips  tricks  management  Delicious 
april 2009 by asteroza
meisner-asplos09.pdf (application/pdf Object)
Idea here is to use near consumer grade (500W) cheap power supplies with fast response factors, coupled with aggressive OS sleep software (and maybe SSD's to cut back on the response start lag of spinning disks), to create server arrays that can shed power load to follow computational demand load. Easier to turn off single power supplies working in an array set to cut power than to tweak a single big monolithic power supply.
sharing  green  energy  power  datacenter  supply  reduction  server  high  efficiency  speed  load  response  rails  demand  redundant  consumption  array  PowerNap  inexpensive  filetype:pdf  media:document  Delicious 
march 2009 by asteroza
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