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Items tagged with: led


 

Teenager sues Apple for $1bn after facial recognition led to false arrest


HN Discussion: https://news.ycombinator.com/item?id=19726528
Posted by computator (karma: 1409)
Post stats: Points: 120 - Comments: 99 - 2019-04-23T08:12:30Z

#HackerNews #1bn #after #apple #arrest #facial #false #for #led #recognition #sues #teenager
HackerNewsBot debug: Calculated post rank: 113 - Loop: 87 - Rank min: 100 - Author rank: 64


 

Random Word Pairings Mark The Time On This Unusual Clock


#clockhacks #led #picaxe #prng #sevensegment #wordclock #hackaday
posted by pod_feeder_v2
Random Word Pairings Mark The Time On This Unusual Clock


 

Replicating 1970s LED Displays


#ledhacks #led #texasinstruments #ti #til305 #hackaday
posted by pod_feeder_v2
Replicating 1970s LED Displays


 

An Even Smaller World’s Smallest LED Blinky


#classichacks #555 #blinky #led #hackaday
posted by pod_feeder_v2
An Even Smaller World’s Smallest LED Blinky


 

Fat, Not Meat, May Have Led to Bigger Hominin Brains


A new theory challenges assumptions about when and how our ancestors altered their behaviors to boost brainpower
Article word count: 1075

HN Discussion: https://news.ycombinator.com/item?id=19600420
Posted by hourislate (karma: 3377)
Post stats: Points: 174 - Comments: 93 - 2019-04-07T22:42:35Z

#HackerNews #bigger #brains #fat #have #... show more


 

A $230k debt and a LinkedIn message led an ex-CIA officer to spy for China


Kevin Mallory went years without a steady job, making him a ripe target for recruitment, court documents say.
Article word count: 979

HN Discussion: https://news.ycombinator.com/item?id=19590585
Posted by onemoresoop (karma: 617)
Post stats: Points: 133 - Comments: 86 - 2019-04-06T13:22:48Z

#HackerNews #230k #and #china #... show more


 

Wallet wars: How a Microsoft-Amazon-led alliance can strike back at Apple Card


#alliance #amazon #apple #back #card #led #microsoft #strike #wallet #wars


 

#action #5g #led #trees

CALL TO ACTION : #London & #Newcastle : 10am Thurs 28th Mar 19


 
ULED: Ubiquitis Netzwerkleuchten bieten Wechselstromversorgung #LED #Netzwerk #OLED #Ubiquiti #PC-Hardware


 
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High-efficiency colloidal quantum dot infrared light-emitting diodes via engineering at the supra-nanocrystalline level....
Colloidal quantum dot (CQD) light-emitting diodes (LEDs) deliver a compelling performance in the visible, yet infrared CQD LEDs underperform their visible-emitting counterparts, largely due to their low photoluminescence quantum efficiency. Here we employ a ternary blend of CQD thin film that comprises a binary host matrix that serves to electronically passivate as well as to cater for an efficient and balanced carrier supply to the emitting quantum dot species. In doing so, we report infrared PbS CQD LEDs with an external quantum efficiency of ~7.9% and a power conversion efficiency of ~9.3%, thanks to their very low density of trap states, on the order of 1014 cm−3, and very high photoluminescence quantum efficiency in electrically conductive quantum dot solids of more than 60%. When these... show more


 
By Elise Petrovich



2019-02-20T20:08:00-05:00

yule love this LED signage

Source: https://unsplash.com/photos/jDXkwG-hPlk
Full image: Link

Via Unsplash.com

#photography #CC0 #Unsplash #APIRandom #yule #love #this #LED #signage


 

President Trump: Lawsuit against National Emergency is led by open border Democrats


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#against #border #border security #border wall #california #democrats #emergency #immigration #lawsuit #led #national #national emergencies act #national emergency #ninth circuit court #oan newsroom #open #president #president trump #trump
President Trump: Lawsuit against National Emergency is led by open border Democrats


 
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New approach improving stability and optical properties of perovskite films....Metal halide perovskites are regarded as next generation materials for light emitting devices (LEDs).A recent joint-research co-led by the scientist from City University of Hong Kong (CityU) has developed a new and efficient fabrication approach to produce all-inorganic perovskite films with better optical properties and stability,enabling the development of high colour-purity and low-cost perovskite LEDs with a high operational lifetime.
#perovskite #LED #Metal #halide #CRYSTALLOGRAPHY #CHEMISTRY #OPTICS #INORGANIC #ELECTRONICS #HARDWARE #TECHNOLOGY #SCIENCE
https://www.eurekalert.org/pub_releases/2019-02/cuoh-nai021319.php


 

What Happened to the 100,000-Hour LED Bulbs?



Early adopters of LED lighting will remember 50,000 hour or even 100,000 hour lifetime ratings printed on the box. But during a recent trip to the hardware store the longest advertised lifetime I found was 25,000 hours. Others claimed only 7,500 or 15,000 hours. And yes, these are brand-name bulbs from Cree and GE.

So, what happened to those 100,000 hour residential LED bulbs? Were the initial estimates just over-optimistic? Was it all marketing hype? Or, did we not know enough about LED aging to predict the true useful life of a bulb?

I put these questions to the test. Join me after the break for some background on the light bulb cartel from the days of incandescent bulbs (not a joke, a cartel controlled the life of your bulbs), and for the destruction of some modern LED bulbs to see why the lifetimes are clocking in a lot lower than the original wave of LED replacements.
Interesting and thorough piece. The conclusion is not entirely surprising though.

#electronics #light #led


 

Reddit confirms $300M Series D led by China’s Tencent at $3B value


Last week TechCrunch reported that Reddit was raising $150 million from Chinese tech giant Tencent and up to $150 million more in a Series D that would value the company at $2.7 billion pre-money or…
Article word count: 429

HN Discussion: https://news.ycombinator.com/item?id=19140056
Posted by theBashShell (karma: 2018)
Post stats: Points: 127 - Comments: 110 - 2019-02-12T00:55:29Z

#HackerNews #300m #chinas #confirms #... show more


 


#BREXIT #EU #FRACKING #LED #5G

The MAGICK of the Sociopathic GLOBAL CORPORATIST ....


 
By Sam Roach



2019-01-13T00:50:29-05:00

black and white LED light

Source: https://unsplash.com/photos/BC7aTPTku58
Full image: Link

Via Unsplash.com

#photography #CC0 #Unsplash #APIRandom #black #and #white #LED #light


 

What Happened to the 100000 Hour LED Bulbs?


Early adopters of LED lighting will remember 50,000 hour or even 100,000 hour lifetime ratings printed on the box. But during a recent trip to the hardware store the longest advertised lifetime I f…
Article word count: 2805

HN Discussion: https://news.ycombinator.com/item?id=19096369
Posted by jccalhoun (karma: 2468)
Post stats: Points: 187 - Comments: 156 - 2019-02-06T16:16:22Z

#HackerNews #100000 #bulbs #happened #hour #... show more


 
A #team of #researchers #led by #MojuZhao from #JSK #Laboratory at the #University of #Tokyo #demonstrates its #articulated #transforming #Dragon #drone.
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The researchers talk about how it came to be and what they hope for it in the future. See it transform in mid-air to suit different purposes, and hear what the researchers think about the Dragon of their dreams.
https://www.invidio.us/watch?v=uje6iUBbkwM