asteroza + passive   67

High-performance subambient radiative cooling enabled by optically selective and thermally insulating polyethylene aerogel | Science Advances
So the focus on this was not heat loss, but heat gain. The idea here is the aerogel is a broadband blocker but narrowband IR transparent (likely at atmospheric wiindow IR frequencies here) and has low direct thermal conductivity. So it's a bit paradoxical in that it's an insulator for conductive heat, but transparent to specific IR (which works well with a narrow band emitter/converter plate), and keeps the energy of the sun off the underlying emitter (though it will naturally leak in solar IR in the narrowband frequency range it is IR transparent to though)
polyethylene  aerogel  passive  cooling  materials  science  research  technology 
november 2019 by asteroza
the monotricat seems to be some sort of air ingesting monohull to try to do passive air lubrication
monotricat  passive  air  lubrication  drag  reduction  ship  boat  marine  engineering  design  italy  EU 
october 2019 by asteroza
Extracting audio from visual information | MIT News
High quality camera can detect vibrations on objects (here, a rather amenable chip bag), can regenerate audio from detected vibrations.

No mic, no problem...
surveillance  video  audio  reconstruction  recovery  passive 
december 2018 by asteroza
Contactless steam generation and superheating under one sun illumination | Nature Communications
Okay, it's cheating to say one sun when using a concentrator, but switch from direct contact heat transfer with capillary flow to IR emitter and vapor passthru is interesting
carbon  foam  solar  heat  absorber  IR  thermal  emitter  steam  generator  passive  materials  science  research  technology 
december 2018 by asteroza
Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling | Science
New cheapish polymer coating to make a narrowband IR emitter that pumps through the LWIR atmospheric transmission window. So something can be cooled by exposing it to the sky.
passive  daytime  radiative  cooling  narrowband  emitter  IR  materials  science  research  technology  polymer  surface  coating  air  void  phase  inversion 
october 2018 by asteroza
New business unit: Ottobock Industrials — Ottobock
Paexo exoskeleton being trialed by VW. Looks like a passive upper torso/arm assist type
prosthetic  passive  active  industrial  upper  torso  arm  exoskeleton  VW  germany 
september 2018 by asteroza
Mira Prism AR
So these students cut up fishbowls, mounted them on a headband with an iPhone holder, and made a decent passive AR headset
Mira  passive  reflective  prism  optics  AR  headset  HMD  display  hardware 
july 2017 by asteroza
List of Physical Visualizations
Interesting 3D objects for physics/chemistry/data visualization, by a physical object/token
physics  chemistry  3D  information  data  visualization  model  physical  passive  sculpture  art 
june 2017 by asteroza
Jeeva Wireless
Using modulated passive reflection of ambient signal to achieve low power but reasonable wifi speed.
passive  low  power  wifi  RF  signal  reflection  modulation  wireless  research  technology  Delicious 
december 2016 by asteroza
Spring Loaded Technology
Passive exoskeletal knee brace using a liquid spring type setup to recover bending energy.
passive  exoskeleton  knee  brace  energy  recovery  liquid  spring  Delicious 
july 2016 by asteroza
NASA Deploys Satellite Designed to Re-enter Atmosphere Using Revamped Drag Device
I suppose this might be better than a terminator tape, since such a tether tends to generate huge amounts of current which tends to shock things and short out...
exo-brake  orbital  parachute  drag  anchor  reentry  device  deorbit  kite  passive  hardware  space  technology  research  Delicious 
march 2015 by asteroza
Passive radiative cooling below ambient air temperature under direct sunlight : Nature : Nature Publishing Group
Interesting mixed material which re-emits heat at atmospheric IR transparency windows, effectively becoming a passive cooler. So an external radiator on earth covered with this paint can get pretty cool.
photonic  radiative  cooling  solar  radiator  mirror  selective  thermal  emitter  materials  science  research  technology  passive  hafnium  silicon  dioxide  tuned  cooler  nanoparticle  layer  IR  infrared  transparency  window  atmospheric  green  paint  surface  treatment  Delicious 
december 2014 by asteroza
Microtags for anti-counterfeiting & brand protection from Trutag
Some sort of weird passive spectral tag, using spectral response spikes as a kind of passive barcode. Tiny and made of inert silica so edible.
microtag  monitoring  asset  form  tag  barcode  code  factor  size  edible  silica  porous  passive  encoding  small  forensic  spectral  Delicious 
august 2013 by asteroza
Stanford scientists develop new type of solar structure that cools buildings in full sunlight
Weird passive panel cooling utilizing high reflectivity and spectrum gaps. Won't do you a lot of good if you are directly facing the heat source in question though...
panel  technology  thermal  narrowband  solar  research  heat  reflector  nanophotonic  science  materials  passive  broadband  emitter  management  nanotechnology  Delicious 
april 2013 by asteroza - sound-optimised premium components "Designed in Austria"!
Low acoustic signature PC fans, previous all passive, but now demoing active noise cancellation active cooling fan tech too
Noctua  RotoSub  passive  active  noise  cancellation  low  acoustic  signature  cooling  fan  blower  hardware  electronics  devices  PC  Delicious 
june 2012 by asteroza
Molnar Group
Interesting unpatented multiband SDR design with good performance, and size roughly equivalent to dedicated single band ASIC's.
SDR  software  defined  multiband  radio  design  chip  passive  mixer  digital  receiver  solid  state  circuit  design  Delicious 
december 2011 by asteroza
Magnetal - Advanced Technology for Magnetic Bearings
Interesting, but a little sketchy. It seems to be a properly integrated Halbach array magnet being using for magnetic levitation in a bearing, with some self correcting fores that are useful, but aren't Halbach arrays by definition a drag device that has to be overcome by other forces? Can the drag really be superior to classical magnetic bearings? Or perhaps not, but simplicity of manufacturing means it may be the cheaper choice in the realm of magnetic bearings. But maximum bearing force capacity (lift capability of a Halbach array) is kinda limited usually, right?
HEDB  homopolar  electrodynamic  bearing  passive  high  speed  magnetic  flywheel  support  energy  storage  Halbach  array  magnet  levitation  Delicious 
november 2010 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
B-Core Inc.|Color Bit Code
This could be used as an alternative to active RFID tags. The basic system triggers on an IR code from the reader, then burst sends the Opto-Chrono code output. If you could get really low power, it may be possible to make a form of passive tag , which uses an IR solar cell to gather power outputted by the reader (primary power IR lamp at constant power output , and a secondary comms IR at a different frequency) in a capacitor for operation.
Opto-Chrono  code  LED  flash  morse  color  barcode  active  passive  optical  tag  alternative  RFID  Delicious 
may 2010 by asteroza
Wind Energizer Boosts Wind Turbine Output 30% | ecopolitology
seems basically a bump around the base of the tower to locally accelerate airflow like that over a wing. simple to build, but I wonder if it scales from the experiments considering the aerodynamics involved (reynolds numbers)
wind  turbine  power  generator  enhancement  passive  structure  green  energy  Delicious 
october 2009 by asteroza

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