narrowband   18

Twitter
> is highlighting a use case of its service that it says could help reinvent…
Narrowband  IoT  from twitter_favs
15 days ago by freerange_inc
A radiative cooling structural material | Science
using boiling hydrogen peroxide, these researchers reduced/compressed wood by removing the lignin, making an engineered wood with interesting properties, such as high strength. The kicker is that the white material is also a narrowband IR emitter tuned to dump heat to space through the atmospheric windows, so it can cool you in broad daylight.
engineered  wood  lignin  removal  narrowband  IR  emitter  atmospheric  window  insulation  cooling  subambient 
8 weeks ago by asteroza
Simultaneously and Synergistically Harvest Energy from the Sun and Outer Space - ScienceDirect
If you can take out the backing metal foil of a PV panel, then line the bottom with a narrow band IR re-emitter that converts rooftop heat to a band that can escape out of the atmospheric IR window, allows roof cooling and power generation simultaneously in theory.
solar  PV  panel  narrowband  IR  emitter  roof  cooling  power  generator  materials  science  research  technology 
november 2018 by asteroza
Ting Narrowband IoT
Ting offers service for Narrowband IoT or NB-IoT. I'd like to build a data collector for my Westy's 12V and other systems, and it'd be cool to continuously publish that data inexpensively using narrowband. (Packet Radio would be fun, too.) There's a (broken) link to a module from u-blox. I'll look for low-power single board computers that offer that module as a plug-in.
nb-iot  iot  narrowband  u-blox  ublox  westy  ting  diy 
november 2018 by sbw
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
What is Narrowband IOT?
What is Narrowband IoT?
By Sacha Kavanagh
What  is  Narrowband  IoT  -  Kavanagh  5G 
february 2018 by kilroy2
Scalable-manufactured randomized glass-polymer hybrid metamaterial for daytime r...
Yet another IR narrowband emitter/frequency converter that rejects to space, but interesting method...
selective  IR  emitter  research  technology  metamaterial  materials  science  narrowband  frequency  converter  TPX 
march 2017 by asteroza
Twitter
dear , even for only $8 this is horrible value for the money.
narrowband  dialupwasbetter  from twitter
june 2016 by rmohns
Magnetic hyperbolic optical metamaterials : Nature Communications : Nature Publishing Group
New metamaterial allows conversion of wideband IR into enhanced narrowband IR, suitable for TPV and atmospheric heat rejection to space.
magnetic  hyperbolic  dispersion  metamaterial  materials  science  research  technology  nanotechnology  lens  filter  frequency  concentrator  IR  TPV  thermophotovoltaic  converter  narrowband  emitter  Delicious 
april 2016 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
Narrowband on the Decline in the U.S.
Hawaii had a 95 percent increase in broadband penetration this quarter, but the state only has a 5.7 percent penetration rate overall for broadband -- so there is still a lot more room for high-speed broadband growth.
imported  broadband  narrowband  dialup  internet  access  akamai  connectivity  statistics  bytemarkscafe  bc20081119 
november 2008 by hawaii
Seven Steps to Noise-Free Digital Audio
Excerpted from book on digital audio essentials. Includes audio samples.
audio  hiss  digital  noise  impulse  narrowband  click  noise_reduction  Early_career_and_education 
july 2005 by Gardo

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