Erstmals Weltraumschrott bei Tageslicht vermessen
▻https://diasp.eu/p/11580438
Erstmals Weltraumschrott bei Tageslicht vermessen
Weltraumschrott wird zu einem wachsenden Problem. Genaue Messungen können helfen, das Problem einzudämmen. Schweizer Forscher vermelden nun einen Durchbruch. Erstmals Weltraumschrott bei Tageslicht vermessen #Laser #Weltraum #Weltraummüll
New surveillance tech means you’ll never be anonymous again
Forget facial recognition. Researchers around the world are creating new ways to monitor you. Lasers detecting your heartbeat and microbiome are already being developed
The fight over the future of facial recognition is heating up. But it is just the beginning, as even more intrusive methods of surveillance are being developed in research labs around the world.
In the US, San Francisco, Somerville and Oakland recently banned the use of facial recognition by law enforcement and government agencies, while Portland is talking about forbidding the use of facial recognition entirely, including by private businesses. A coalition of 30 civil society organisations, representing over 15 million members combined, is calling for a federal ban on the use of facial recognition by US law enforcement.
Meanwhile in the UK, revelations that London’s Metropolitan Police secretly provided facial recognition data to the developers of the Kings Cross Estate for a covert facial recognition system have sparked outrage and calls for an inquiry. The Information Commissioner’s Office has launched an investigation into the legality of the program. But the scandal comes at the same time as a landmark ruling by the High Court in Cardiff that said the use of facial recognition by South Wales police is legal. (The decision is likely to be appealed).
Facial recognition is only the tip of the creepy surveillance iceberg, however. If strict regulation is brought in to govern the use of facial recognition, it is possible we may simply see a switch to one, or several, of the other forms of surveillance technologies currently being developed. Many are equally if not more invasive than facial recognition – and potentially even harder to regulate. Here’s a look at some of what might be coming down the pipeline.
How you walk
The rapidly growing field of behavioural biometrics is based on recognising individuals from their patterns of movement or behaviour. One example is gait recognition, which may well be the next surveillance technology to hit the mainstream, especially if facial recognition comes under tight regulation. The technique is already being trialled by police in China, which frequently leads the field when it comes to finding new ways to monitor its people, whether they like it or not.
There are a few different ways of recognising an individual from the way they walk. The method being trialled by Chinese police is based on technology from a company called Watrix, and relies on the use of video surveillance footage to analyse a person’s movements as they walk. In a recently granted patent, Watrix outlines a method of using a deep convolutional neural network to train an AI system capable of analysing thousands of data points about a person as they move, from the length of their stride to the angle of their arms, and use that to recognise individuals based on their ’gait record’. Watrix claims that its systems achieve up to 94 per cent accuracy, and that it holds the world’s largest database of gait records.
The vision-based methods of gait recognition being developed by Watrix and others can be used to identify people at a distance, including in crowds or on the street, in a similar way that facial recognition can – which could make it a quick and easy substitute if regulation is brought in against facial recognition. Increasingly, many video surveillance systems are collecting multi-modal biometrics. That means they may be using facial recognition and gait recognition simultaneously, which at least in theory should both increase the accuracy and tackle issues like identifying people facing away from the cameras.
Another method for identifying people by their walk relies on sensors embedded in the floor. Researchers from the University of Manchester used data from 20,000 footsteps belonging to 127 individuals to train a deep residual neural network to recognise 24 distinct factors, like the person’s stride cadence and the ratio of time on toe to time on heel (the people did not need to take off their shoes, as the system analyses movement rather than shape of the foot). Using this system, they were able to identify individuals with over 99 per cent accuracy in three ’real world’ scenarios: the workplace, the home environment, and airport security checkpoints.
According to the researchers, the benefits of this kind of identification over vision-based systems are that it is less invasive, and less prone to disruption from objects or other people obscuring the camera’s view. Of course, another way of saying that it is less invasive is that it is harder for people to detect when it’s being used on them. People might notice when they’re being watched by cameras, but they’re much less likely to be aware of sensors in the floor.
Heartbeat detection
Your heartbeat and your breathing pattern are as unique as your fingerprint. A small but growing number of remote sensing technologies are being developed to detect vital signs from a distance, piercing through skin, clothes and in some cases even through walls.
In June, the Pentagon went public with a new laser-based system capable of identifying people at a distance of up to 200m. The technology, dubbed Jetson, uses a technique known as laser doppler vibrometry to detect surface movement caused by your heartbeat.
The eventual goal is to be able to identify a target within five seconds based on their cardiac signal, or ’heartprint.’ At the moment, however, the Pentagon’s system has a number of limitations: the target needs to be standing still, needs to be wearing light clothing (thick clothing, like a heavy coat, can interfere with the signal), and most importantly there needs to be a clear line of sight between the laser and the target.
Coats, walls, even rocks and rubble are no obstacle for another nascent surveillance technology, however. Researchers are hard at work developing radar-based systems capable of tracking vital signs for a range of purposes, from non-invasive monitoring of patients and aiding in medical diagnoses to finding survivors in search and rescue operations.
Monitoring indoor movements
But why bother installing new radars when we’re already bathed in a different sort of radiation pretty much all the time? Wi-Fi can also be used to locate individuals, identify their position in the room and whether they’re sitting or standing, and even track vital signs.
Until recently, it was thought a dedicated Wi-Fi network was required, in part because the technique depends on knowing the exact position of the Wi-Fi transmitters. In 2018, however, a group of researchers at the University of California built an app which allowed them to figure out the exact location of existing Wi-Fi transmitters in a building. With that information, they were able to use normal smartphones and existing ambient Wi-Fi networks to detect human presence and movement from outside the room. “With more than two Wi-Fi devices in a regular room, our attack can detect more than 99 per cent of user presence and movement in each room tested,” the researchers claim.
Some research groups want to go further than just using Wi-Fi to identify people. Based on movement and vital signs, they claim it is possible to monitor the subject’s emotional state and analyse their behavioural patterns. These researchers have formed a company to market a ’touchless sensor and machine learning platform for health analytics’, which they claim has been deployed in over 200 homes and is being used by doctors and drug companies.
Beyond the potential benefits for healthcare and emergency responders, however, the technology also has obvious applications for surveillance. Technology which is capable of building up a profile of a person’s heartbeat and breathing in order to watch for abnormalities in a health context is readily adaptable to being used to identify one person from another. Radar-based security surveillance systems capable of detecting people are already on the market, It’s only a matter of time, and perhaps not even very much time, before the ability to identify individual people is layered on top.
Tracking your microbial cells
Every person emits around 36 million microbial cells per hour, and human microbiomes are unique for a certain period of time (a 2015 study found that around 80 per cent of people could be re-identified using their microbiome up to a year later). This means that the constant trail of microbial traces we leave behind us, as well as those we pick up from our surroundings, can be used to help reconstruct a picture of a person’s activities and movements, like where they walked, what objects they touched and what environments they have been in.
Monitoring your scent
Identifying people by smell is actually one of the oldest police tricks in the book, but doing it with computers instead of bloodhounds is still in its infancy in comparison with facial and fingerprint recognition. The field of odor biometrics may be useful for individual authentication but is not well suited to mass surveillance – separating exactly who smells like that in a crowd can be tricky, as anyone who has been stuck in public transport on a hot day probably knows.
Bum detection
Then there are the identification techniques designed for very specific use cases. One pioneering suggestion from a team of Japanese researchers for an anti-theft system for cars was based on using 360 sensors to measure the unique shape of the driver’s rear end. Despite achieving a 98 per cent accuracy rate in trials, tragically this important security innovation does not seem to have gone any further than lab testing.
The regulation problem
Trying to regulate surveillance technologies one by one is likely to be futile. The surveillance industry is simply developing too fast, and it is too easy to switch from one kind of surveillance to another. The difference between a facial recognition system and one based on behavioural biometrics may simply be a matter of swapping the software on an existing camera network, for example.
Increasing cooperation between government agencies and the private sector also means that regulations like San Francisco’s, which limits only government use of certain types of surveillance, are insufficient according to Katina Michael, a professor in the School for the Future of Innovation in Society and School of Computing, Informatics and Decision Systems Engineering at Arizona State University.
Amazon is perhaps the prime example for this blurring of the lines between private and government surveillance. Amazon has previously come under criticism for selling facial and emotion-recognition systems to police. More recently, it has been revealed that Amazon is partnering with hundreds of law enforcement agencies in the US, including giving them access to surveillance data gathered through its Ring home doorbell in return for police actively marketing the devices to the community.
“Fundamentally, we need to think about democracy-by-design principles,” Michael says. “We just can’t keep throwing technologies at problems without a clear roadmap ahead of their need and application. We need to assess the impact of these new technologies. There needs to be bidirectional communication with the public.”
Surveillance changes the relationship between people and the spaces they live in. Sometimes, that change is for the better; there are real benefits from increased security, and the insights which can be gained into how people use public places can be used to help shape those places in the future. At the same time, however, we need to ask ourselves whether the future society we want to live in is one which constantly watches its citizens – or, more likely, one in which citizens are never totally sure when, how and by whom they’re being watched.
▻https://www.wired.co.uk/article/surveillance-technology-biometrics
#surveillance #laser #microbiome #battements_cardiaques #coeur #comportement #mouvement #marche #respiration #corps #vibrométrie #doppler_vibrometry
ping @etraces
Another method for identifying people by their walk relies on sensors embedded in the floor. Researchers from the University of Manchester used data from 20,000 footsteps belonging to 127 individuals to train a deep residual neural network to recognise 24 distinct factors, like the person’s stride cadence and the ratio of time on toe to time on heel (the people did not need to take off their shoes, as the system analyses movement rather than shape of the foot). Using this system, they were able to identify individuals with over 99 per cent accuracy in three ’real world’ scenarios: the workplace, the home environment, and airport security checkpoints.
According to the researchers, the benefits of this kind of identification over vision-based systems are that it is less invasive, and less prone to disruption from objects or other people obscuring the camera’s view. Of course, another way of saying that it is less invasive is that it is harder for people to detect when it’s being used on them. People might notice when they’re being watched by cameras, but they’re much less likely to be aware of sensors in the floor.
Sprawling Maya network discovered under Guatemala jungle - BBC News
▻http://www.bbc.com/news/world-latin-america-42916261
Researchers have found more than 60,000 hidden #Maya ruins in #Guatemala in a major archaeological breakthrough.
#Laser technology [Lidar] was used to survey digitally beneath the forest canopy, revealing houses, palaces, elevated highways, and defensive fortifications.
The landscape, near already-known Maya cities, is thought to have been home to millions more people than other research had previously suggested.
[...]
The group of scholars who worked on this project used Lidar to digitally remove the dense tree canopy to create a #3D map of what is really under the surface of the now-uninhabited Guatemalan rainforest.
“Lidar is revolutionising archaeology the way the Hubble Space Telescope revolutionised astronomy,” Francisco Estrada-Belli, a Tulane University archaeologist, told National Geographic. “We’ll need 100 years to go through all [the data] and really understand what we’re seeing.”
Ultrafast 3D Printing Alternative Makes Complete 3D Objects in Seconds
▻https://singularityhub.com/2017/12/08/ultrafast-3d-printing-alternative-makes-complete-3d-objects-in-secon
▻https://www.youtube.com/watch?v=00H-hXufpQE
A new technique can now fabricate entire 3D shapes in seconds using holographic light fields.
La biomasse forestière au laser - Institut de recherche pour le développement (IRD)
▻http://www.ird.fr/toute-l-actualite/actualites/actualites-generales/la-biomasse-forestiere-au-laser
L’estimation de la #biomasse contenue dans les #forêts tropicales pourrait connaître une véritable révolution technologique. Une nouvelle méthode, développée et expérimentée par des scientifiques en Afrique centrale 1, permet en effet de la mesurer sans abattre d’arbre. « Nous utilisons un scanner #laser pour évaluer la quantité précise de #carbone séquestré dans le tronc, les branches et le feuillage », explique l’écologue spécialiste de télédétection Nicolas Barbier, co-auteur d’une récente étude sur le sujet 2.
C’est chouette et en même temps j’ai l’impression que tout ce qui sert à mesurer de plus en plus finement les quantités de carbone stockées ici où là, ne sert finalement que d’alibi pour continuer #tout-droit-dans-le-mur .
See the Strange, Beautiful Landscapes Revealed by Lasers
▻https://news.nationalgeographic.com/2017/11/maps-lidar-washington-state-laser-scanning-geology
If you were to strip a forest of all its vegetation, what would you see? To find out, Washington state’s government is using airplanes equipped with LIDAR technology to scan the state’s heavily-forested ground. What’s being revealed beneath the trees is a spectacular and strange landscape of hidden geology. Old landslides, abandoned river channels, ancient lava flows, and the tracks of glaciers are suddenly visible in stark relief.
After the devastating Oso landslide in 2014 that killed 43 people in a small town 50 miles outside of Seattle, Washington’s Geological Survey decided to use LIDAR to get a better handle on the state’s geologic hazards. LIDAR, which stands for “light detection and ranging,” works by sending laser light pulses toward a target and measuring the amount of time it takes for those pulses to return. Some of the light is reflected off the tops of trees, and some manages to filter through the trees to be reflected back by the ground. By using just the light reflected from the lowest point, the ground is revealed.
https://news.nationalgeographic.com/content/dam/news/2017/11/28/landscape-washington-state/02-lidar-washington-19_stream_channels_quinault_river_4_3_no_text1.ngsversion.1511971234687.adapt.536.1.jpg 
https://news.nationalgeographic.com/content/dam/news/2017/11/28/landscape-washington-state/03-lidar-washngton-02_landslides_cedar_river_4_3_no_text1.ngsversion.1511971234756.adapt.536.1.jpg 
https://news.nationalgeographic.com/content/dam/news/2017/11/28/landscape-washington-state/09-lidar-washington-18_mima_mounds_thurston_county_4_3_no_text1.ngsversion.1511971223155.adapt.536.1.jpg 
Cubiio downsizes the laser engraver
▻https://newatlas.com/cubliio-compact-laser-engraver/50976
▻https://img.newatlas.com/cubliio-laser-engraver-1.jpg?auto=format%2Ccompress&fit=max&h=670&q=60
Laser engravers are traditionally big, bulky units, meaning you have to cart the item you want engraved to the engraver – which can be a chore if the item is also big and bulky. But a new laser engraver from Taiwan-based startup Mulherz makes it easy to bring the engraver to the item. Small enough to fit in a handbag and controlled via a smartphone app, Cubiio literally puts a laser engraver in the palm of your hand.
Les polices romandes sceptiques face aux lunettes contre les pointeurs laser Rts.ch - Berne - Ludovic Rocchi/ jzim - 20 Mars 2017 _
▻https://www.rts.ch/info/regions/berne/8476295-les-polices-romandes-sceptiques-face-aux-lunettes-contre-les-pointeurs-l
Certains manifestants n’hésitent pas à utiliser des pointeurs laser sur les forces de l’ordre
Dangereux pour les yeux, les pointeurs laser sont de plus en plus souvent utilisés lors d’affrontements avec les forces de l’ordre. Ces dernières s’équipent de lunettes de protection, mais des doutes émergent sur leur efficacité.
Ces lunettes portent le doux nom de « Terminator », elles sont importées d’Allemagne et sont vendues environ 130 francs la paire par une entreprise bernoise.
Mais la société - qui se vante d’équiper déjà de nombreux corps de police - refuse de s’exprimer sur la fiabilité de son produit. Il est en fait très complexe de couvrir l’ensemble du spectre des pointeurs lasers.
Lésions à Berne malgré ces lunettes
Alors que la vue est aussi assombrie lors des interventions la nuit, plusieurs grenadiers bernois équipés de lunettes Terminator ont récemment subi des lésions oculaires, lors d’affrontements autour de la Reithalle.
Des événement qu’il faut d’abord analyser avant de condamner le dispositif, indique le porte-parole de la police bernoise Christoph Gnägi. « Ces lunettes sont un moyen de protection comme un casque, et ne garantissent jamais un niveau de sécurité de 100%. C’est la raison pour laquelle il faut bien essayer d’élucider les circonstances exactes des événements », a-t-il déclaré à la RTS.
L’enquête en cours intéresse tous les autres corps de police qui ont aussi acheté des lunettes Terminator, soit plus de 3000 paires essentiellement du côté alémanique.
Attitude de prudence à privilégier
Les Romands sont plus sceptiques, à l’image du commandant neuchâtelois Pascal Lüthi. Il n’en a commandé qu’une vingtaine de paires pour l’instant : « Il y a des questions encore ouvertes notamment en termes d’efficacité et de condition d’utilisation. Ce qui est important à ce stade, c’est de ne pas donner un faux sentiment de protection. Une attitude de prudence s’impose par rapport à cette problématique de ces pointeurs laser. »
La police zurichoise se montre pour sa part plus positive. Elle a mené une étude de marché il y a deux ans et rappelle que « les tests étaient concluants ». Des propos à mettre en balance avec l’épreuve du feu que les Bernois ont déjà subie sur le terrain.
Rappelons que les policiers n’hésitent pas à utiliser les pointeurs laser contre les manifestants. « Violence légitime de l’état vs attaque des manifestants » on connaît.
▻http://www.operationteafortwo.com/2012/02/20/usa-la-police-va-utiliser-des-lasers-aveuglants-comme-en-iraq
Y’a ça sinon ▻https://seenthis.net/messages/537013
La police française se prépare : Pointeur laser, équipé sur un LBD. Le rayon balaye la foule . . . . .
Les yeux des manifestants aussi ?
Ils visent si mal. Sont pas assez entrainé.
Suisse Le laser a la cote chez les casseurs - 9 policiers Suisses bléssés Le Matin - 28 Février 2017 - Benjamin Pillard
►http://www.lematin.ch/suisse/Le-laser-a-la-cote-chez-les-casseurs/story/29776820
En plus des « traditionnels » barricades, engins pyrotechniques, vitrines brisées et véhicules en feu, les images rendant compte des violents heurts survenus samedi soir en ville de Berne entre manifestants et forces de l’ordre montrent aussi de larges faisceaux de lumière verte. De puissants rayons lasers, pointés par les protestataires en direction des policiers.
Dans les villes alémaniques, ces petits appareils font partie intégrante de la panoplie des casseurs, au même titre que les pierres, bouteilles et autres pétards, et ce depuis plusieurs années (à Zurich fin 2014, à la Foire de Bâle et dans la capitale fédérale au printemps 2013…). Si bien que les gendarmes, bernois notamment, partent systématiquement en mission équipés de lunettes spéciales antilasers pour ce type d’intervention. Contrairement aux agents des corps de police romands. Du moins pour l’instant ; les black blocs à l’œuvre dans les villes vaudoises ou genevoises n’ayant encore jamais fait usage de ces dangereux rayons susceptibles d’occasionner des lésions irréversibles à la rétine s’ils sont plus puissants que 1 milliwatt.
. . . . . .
#police #Manifestation #Laser #Suisse #Berne
Drôles de pub sur SeenThis : ►https://seenthis.net/messages/572538
La police s’équipe d’une nouvelle arme contre les manifestant-es
▻https://larotative.info/la-police-s-equipe-d-une-nouvelle-2097.html
Nantes, 25 février. Une partie des manifestant-es est obligée de se replier vers la préfecture, avant de repartir pour tenter de rejoindre l’avant du cortège. Mais l’avancée du groupe est interrompue par une charge de la BAC, casquée et masquée, qui se rue sans raison sur un manifestant et le plaque violemment au sol. Les personnes autour sont repoussées à coup de matraques et par l’envoi d’une volée de grenades assourdissantes. Forcément, elles reculent. Pour voir apparaître soudain un rayon vert qui les cible. C’est un pointeur laser, équipé sur un LBD. Le rayon balaye la foule, désignant successivement chaque personne marquée comme une victime potentielle. On était habitué-es à voir les policiers viser à hauteur de visage ; là, l’effet psychologique est décuplé.
La prochaine étape dans l’utilsiation de cette arme est, hélas, facile à prévoir, une personne prise au hasard sera effectivement visée, on lui tirera dessus pour confirmer cette désignation. Ensuite il suffira de pointer ostensiblement cette lumière verte sur n’importe qui pour inspirer la terreur.
Il sera aussi plus facile de prouver une utilisation abusive...
Il faut changer de point de vue et tourner les objectifs de l’autre coté :
Photos et vidéos avec point vert sur les visages témoigneront de la volonté de mutiler.
mutilation qui peut, avec cette arme se produire sans tir puisque la lumière laser est susceptible à elle seule de provoquer des dommages irréversibles à la rétine.
Suisse Le laser a la cote chez les casseurs - 9 policiers Suisses bléssés Le Matin - 28 Février 2017 - Benjamin Pillard
►http://www.lematin.ch/suisse/Le-laser-a-la-cote-chez-les-casseurs/story/29776820
En plus des « traditionnels » barricades, engins pyrotechniques, vitrines brisées et véhicules en feu, les images rendant compte des violents heurts survenus samedi soir en ville de Berne entre manifestants et forces de l’ordre montrent aussi de larges faisceaux de lumière verte. De puissants rayons lasers, pointés par les protestataires en direction des policiers.
Dans les villes alémaniques, ces petits appareils font partie intégrante de la panoplie des casseurs, au même titre que les pierres, bouteilles et autres pétards, et ce depuis plusieurs années (à Zurich fin 2014, à la Foire de Bâle et dans la capitale fédérale au printemps 2013…). Si bien que les gendarmes, bernois notamment, partent systématiquement en mission équipés de lunettes spéciales antilasers pour ce type d’intervention. Contrairement aux agents des corps de police romands. Du moins pour l’instant ; les black blocs à l’œuvre dans les villes vaudoises ou genevoises n’ayant encore jamais fait usage de ces dangereux rayons susceptibles d’occasionner des lésions irréversibles à la rétine s’ils sont plus puissants que 1 milliwatt.
. . . . . .
#police #Manifestation #Laser #Suisse #Berne
Drôles de pub sur SeenThis : ►https://seenthis.net/messages/572538
Le #pet d’une patiente déclenche un #feu pendant une opération chirurgicale | Slate.fr
▻http://www.slate.fr/story/127493/pet-patiente-declenche-feu-operation-chirurgicale
La Tokyo Medical University vient de publier un rapport expliquant comment les #flatulences d’une patiente avaient mis le feu à une partie de son corps pendant une #opération en avril dernier, rapporte le Asahi Shimbun.
Les chirurgiens étaient en train de diriger un laser près du col de l’utérus de la patiente, qui avait une trenaine d’années, et le contact entre le pet et le #laser a déclenché un feu.
Encore une histoire de #gaz :
Brûlé par « l’explosion » d’une batterie d’e-cigarette dans sa poche
Le Télégramme, le 1er novembre 2016
▻http://www.letelegramme.fr/france/toulouse-brule-par-l-explosion-d-une-batterie-d-e-cigarette-dans-sa-poc
Et un dessin de Tanx :
▻https://seenthis.net/messages/538540
Oh incroyable...jamais vu celà quand je travaillais dans l’HP...la nature m’étonnera toujours ..
@monolecte oh ça arrive aussi chez les animaux : ►http://www.ouest-france.fr/insolite/insolite-des-pets-de-moutons-forcent-un-avion-atterrir-en-urgence-38280
Commentary: Here’s how the U.S. Navy will defeat Iran’s speedboats | Reuters
▻http://www.reuters.com/article/us-navy-iran-commentary-idUSKCN1151SB
And that’s not all. In 2014, the U.S. Navy fitted a new, large laser gun to the amphibious ship USS Ponce, which is permanently stationed in the Persian Gulf, where it acts as an at-sea base for helicopters, small boats and special operations forces. Big, slow and otherwise lightly armed, Ponce was uniquely vulnerable to the guard corps boat swarms.
The so-called #Laser_Weapon_System , aimed by an operator holding a video-game-style controller, shoots a 30-kilowatt laser over a distance of several miles. As #LaWS doesn’t fire conventional missiles or bullets, instead drawing power from a generator, it essentially never runs out of ammunition. Perfect for wiping out a swarm.
The laser system is a one-off weapon – and, at $40 million, it didn’t come cheap. But having proved that a laser can work in real-world conditions, the Navy is planning to build more and bigger lasers and, potentially, outfit all its front-line warships with them. If that happens, the Islamic Revolutionary Guard Corps swarms might finally meet their match.
A Cross-Section of Results from the 2015 Lidar Campaign - CALI
▻http://angkorlidar.org/2016/05/cross-section-results-2015-campaign
The lidar company (PT McElhanney Indonesia) who did our acquisition for CALI did a completely separate acquisition in Preah Vihear Province under the administrative purview of the Ministry of Mines and Energy, which happily coincides with several areas that saw iron mining and smelting during the Angkor period (and perhaps before and after). They were kind enough to let us analyse the data for archaeological remains, and it turns out that ancient iron-working sites have an extremely clear signature in the lidar data, even though the data quality (density of points) is about a quarter of what we’d normally order for an archaeological project.
#archéologie #angkor #laser #vue_d'avion #cartographie #beau
The current power limitations of air defense #lasers are the reason why they are not yet widespread - but that is not a problem against small UAV. Expect fixed installations soon in critical sites where #UAV overflight has been a source of worry.
▻http://aviationweek.com/defense/lasers-technology-targets-mini-uavs #drones
How To Clock a Glacier - Issue 22: Slow
▻http://nautil.us/issue/22/slow/how-to-clock-a-glacier
A low-flying airplane buzzes along the coast of Greenland, hovering over a glacier. The belly of the plane holds a laser that bounces light off the glacier’s face. As the light beam returns to the plane, it enters a black box that slows it to a crawl, turning it into a moment-by-moment report on the glacier’s speed. Each flight, each glacier measured, allows researchers to map the diminishment of the Greenland ice cap. Similar planes skirt Antarctica and the coast of Alaska, charting the damage to the ice cover. These airplanes and their experimental equipment don’t exist yet. But the need to measure glacier flow in real time does exist. The latest report by Intergovernmental Panel on Climate Change (IPCC) projected that melting ice may result in as much as one meter of sea-level rise (...)
Laser-generated surface structures create extremely water-repellent metals
▻http://www.rochester.edu/newscenter/superhydrophobic-metals-85592
▻https://www.youtube.com/watch?x-yt-ts=1421782837&v=FLegmQ8_dHg&x-yt-cl=84359240
Et apparemment #Seenthis ne digère pas les .gifv
Google Unveils The Cartographer, Its Indoor Mapping Backpack | TechCrunch
▻http://techcrunch.com/2014/09/04/google-unveils-the-cartographer-its-indoor-mapping-backpack/?ncid=rss&cps=gravity
The Cartographer uses a process called “simultaneous localization and mapping” (SLAM), a technique that’s typically used for mapping new locations and that Google is now putting to use to map anything from hotels to museums.
As the backpacker walks through a building, the floor plan is automatically generated in real time, Google says. The wearer also uses a tablet to add points of interest while walking around the building (...)
the backpack features multi-echo laser scanners (judging from Google’s images, the backpack features two of these $4,500 units) and an inertial measurement unit.
Bientôt des radars pour mesurer l’alcoolémie des conducteurs ? - Passeur de Sciences
▻http://alireailleurs.tumblr.com/post/89741952580
Sur son excellent blog, le journaliste Pierre Barthélémy revient sur l’annonce faite par trois spécialistes polonais des lasers de créer des éthylomètres distants grâce à la spectroscopie : installer des radars envoyant un laser dont la longueur d’onde correspond à celle de la raie d’absorption de l’éthanol, pour détecter à distance des conducteurs ayant trop bus… Après l’idée d’élargir l’utilisation des caméras de #surveillance pour réprimer des infractions punies par contravention, comme le proposaient des députés UMP, permettant de sanctionner le dépôt d’ordure sur la voie public ou le stationnement à distance, voilà encore une nouvelle fonction pour démultiplier leurs capacités policières…
Pierre Barthélémy revient sur l’annonce faite par trois spécialistes polonais des lasers de créer des éthylomètres distants grâce à la spectroscopie
A mon avis, ces trois scientifiques étaient bourrés !
Le papier des Polonais (accès libre)
▻http://remotesensing.spiedigitallibrary.org/article.aspx?articleid=1874322
avec ce schéma de principe de l’installation
Apparemment, en l’état actuel de la technique, mettre la ventilation à fond diminuerait la sensibilité des mesures.
US Army Straps Laser to Truck, Takes Target Practice With Drones and Mortars | Singularity Hub
▻http://singularityhub.com/2014/01/01/us-army-straps-laser-to-truck-takes-target-practice-with-drones-and-
the US Army recently reported they’d successfully engaged over 90 mortars and drones with—a giant laser mounted on top of a truck.
Des télescopes et des lasers pour scruter le ciel de Hawaï
▻http://www.laboiteverte.fr/telescopes-lasers-scruter-ciel-hawai
Sean Goebel est une étudiant en astronomie qui a profité de son accès aux télescopes du Mauna Kea Observatories pour réaliser ce fantastique film en timelapse où l’on peut voir le mouvement des étoiles et le travail des télescopes.
Une chose des plus surprenante dans cette vidéo est la présence de lasers pointés vers les étoiles provenant des coupoles des observatoires, la raison de leur présence est que même à cette altitude l’atmosphère altère la lumière et floute les images obtenues par les télescopes, pour diminuer le problème les scientifiques envoient un rayon lumineux vers le ciel, mesurent les effets de l’atmosphère dessus et les compensent sur les miroirs des télescopes en les déformants légèrement plusieurs centaines de fois pas seconde.
#Laser Cut #Record
De la musique enregistrée dans du bois !
▻http://www.instructables.com/id/Laser-Cut-Record
#beau ! Je kifferai trop avoir des « vinyls » en bois ! :D
Fujitsu : vers une nouvelle interface utilisateur façon Minority Report
▻http://www.generation-nt.com/fujitsu-vers-nouvelle-interface-utilisateur-facon-minority-report-act
Les fabricants planchent tous sur de nouvelles interfaces, qu’il s’agisse de murs de vapeurs, d’hologrammes ou de capteurs de gestes. Fujitsu a choisi de conjuguer différentes technologies pour son propre système.
Source : Génération-NT
#Fujitsu #interface #Scanner #laser #fujitsu #vers #nouvelle #interface #utilisateur #facon #minority #report
Le rayon tracteur de Star Wars devient réalité
▻http://www.futura-sciences.com/fr/news/t/physique-1/d/le-rayon-tracteur-de-star-wars-devient-racalitac_44290/#xtor=RSS-8
Plusieurs scènes dans Star Wars et Star Trek montrent les effets d’un rayon tracteur capable de piéger des astronefs et des objets pour les manipuler à loisir, notamment en les attirant. La réalité vient de rejoindre la fiction grâce à des groupes de physiciens utilisant des rayons laser …
Source : Futura-Sciences
#laser #Star_Trek #Star_Wars #pince_optique #faisceau_tracteur #Bessel #Lebedev #pression_de_radiation #pression_de_rayonnement #quantité_de_mouvement #photon
Lévitation magnétique et LASER
►http://www.gizmodo.fr/2013/01/07/levitation-magnetique-laser.html
Si la lévitation magnétique semble pour le moment être le moyen de transport ferroviaire le plus rapide à l’heure actuelle, les électroaimants et les rails qu’il nécessitent limitent grandement son implantation. Une découverte pourrait pourtant bien simplifier sa mise en … Continuer la lecture → …
Source : gizmodo.fr - Morgan