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Using a Laser System to Generate Attosecond Pulses at 100 kHz Repetition Rate

Attosecond laser pulses in the extreme ultraviolet (XUV) are a unique tool enabling the observation and control of electron dynamics in atoms, molecules, and solids. ....

Marcjj Vrakking , Felix Schell , Mikhail Osolodkov , Fabio Cavalcante , Federicoj Furch , Fabiohm Cavalcante , Clausp Schulz , Carmens Menoni , Laura Thomsonmar , Serguei Patchkovskii , Felipe Morales , Tobias Witting , Few Pulse Attosecond Trains , Repetition Rate , Optical Physics ,

CNN Anthony Bourdain Parts Unknown April 14, 2014 03:44:00

Soo you use techniques, the same i used to claire fbi recordings in waco and sandy hook 911 calls and so on. after a certain amount of processing with some good planning, this is what we evolve. then once we have an idea of what we re listening for and we feel that we ve gotten it, we do some additional processing and we finally evolve something that is much more useful for taking measurements. [ pinging ] that would be the unmistakable sound with the proper repetition rate, frequency, and shape. and so then we goe we have a pinger sound. but to get to this stage takes lots of work, time and patience. ....

Claire Fbi , Soo You , Sandy Hook , Pinger Sound , Repetition Rate ,

CNN CNN Newsroom April 13, 2014 00:38:00

Digital filters and so on. and that makes it a little easier to to ascertain what we re listening to. okay. finally, another round of enhancement using more tools in our tool box and we ll get something that really sounds identifiable. with the exact repetition rate of one second and the period exactly stable. okay. now, just so you know, under the ocean there are lots of different paths that the sound can take. and the effect of this is multiple sounds reaching the receiver which would tend to make echos and make it not as distinct. and that s some of the problem that they have in identifying these sounds. paul, that is fascinating. when you were here last week, ....

Repetition Rate , The Ocean , Paul Gensburg ,

CNN CNN Newsroom April 13, 2014 19:31:00

reporter: we went behind the scenes at phoenix international, the company that made the towed pinger locator. among them, sonar techs tasked with looking at monitors and listening and listening some more. you ll sit for days at a time and then you might hear a chiropractor but you won t hear another one. until you can duplicate it and run it back at different angles, only until then are you positive that you have it. reporter: and even then, experts say sound in the ocean can play so many tricks on your ears. several people can look at a signal and see different things. because all they are recording is sound energy. reporter: false positives from research equipment left in the area, from the vessel itself can also play tricks on the techs: they are good at weeding out false positives. they do it by monitoring the repetition rate and in op centers like this one on board, ....

Pinger Locator , Fredricka Whitfield , Phoenix International , Atlantic Ocean , Sound Energy , Research Equipment , Repetition Rate ,

CNN The Lead With Jake Tapper April 12, 2014 01:29:00

Monitoring the frequencies and the repetition rate. they re highly trained to be disciplined and discriminate, to block out any other sounds. paul nelson who worked the search for flight 447, describes it as tedious and time devouring. the first crew works midnight to noon, the next crew works noon to midnight. you monitor the weather, you re watching what is coming as far as weather. you monitor the seas. and you re sitting in front of this screen hoping and praying that you re going to hear something. does it drive them a little stir crazy? everyone looks forward to the mealtime. that breaks up the monotony. some have been doing it for years, just to find the breakthrough of a pattern of blips. everybody is so focused on the task at hand that once you ....

Paul Nelson , Repetition Rate , Flight 447 , Stir Crazy ,