ANY science that goes BOOM!!
From little droplets exploding in slow-mo right up to the big bang
3388 posts • joined 24 Apr 2007
ANY science that goes BOOM!!
From little droplets exploding in slow-mo right up to the big bang
Just reply to the recruitment firms you are a headhunter .....
A real one .....
But in this case, in a good way.
I'll raise a glass to OSIRIS-REx, and the team behind it
Results from computer models should always be scrutinized carefully (just like any other result in science, really). It is essential that all source code (including version information), parameters, and hardware information should be made public.
In many cases, I find that failure of simulations is often the most interesting part. People postulate a mechanism to explain some phenomenon, and might leave it at that: a just-so story. By drawing up a computer simulation you can test ideas more rigorously, and you sometimes find that the proposed mechanism cannot produce the observed effect. Once you have ruled out numerical instability or just programming errors, you can then safely state that the proposed mechanism does not explain observed behaviour, and that therefore the theory requires some adaptation.
Likewise, leaving out parts of a system because they are too hard to model, or you first want to start with a simple model, and add complexity later (always a good approach) can also give important information. I have done some modelling of bacterial communities in the intestine (insert "your model is shit" joke here), and found that quite a few properties can be modelled well enough fairly simply. For example, even without modelling an immune system, ratios of aerobic vs anaerobic bacteria could be reproduced very well simply from decent estimates of the amounts of nutrients and oxygen entering the system. Practically no other parameter had ANY impact on that ratio (ODE/PDE solvers used, hardware used, time steps used etc.). Not that surprising to biologists perhaps, but medical researchers had assumed the immune system controlled the intestinal microflora. It might do so, but apparently it is not necessary to control the aerobe/anaerobe ratio.
By contrast, if your simulation explains things nicely, you have not learnt that much, only that your mechanism is plausible. Proof requires a lot more than mere simulation
He flew as a navigator in Lockheed Venturas over Africa. He experienced some real turbulence during that time, with the plane lurching or dropping like a brick suddenly as they were flying a much lighter plane than any Boeing or Airbus you care to mention through the weather, rather than over most of it.
of course you can talk to whatever $DEITY you please. Whether he/she/they/it will listen, let alone answer is quite another matter
Beluga whales are far from ungainly, they are actually very graceful in motion, if not quite as acrobatic as dolphins (their distant cousins). Their vocalizations earned them the name "sea canaries"
Regarding the sexiest plane ever? People have proposed some great contenders (XB70, TSR2, SR71, Vulcan, Spitfire and Me262 are all in the super-model category), but I do have a particular soft spot for the Wooden Wonder: the De Havilland Mosquito.
The story somehow reminds me of the time I spent reading the small print of the insurance policy my parents took out on a small sailing dinghy (a 12 foot affair hardly counts as a yacht) they had bought. I was rather amused to see that the insurance explicitly stated that if the craft was used in acts of war, they would not cover any resulting damage. I immediately had this mental image of the little craft capsizing under the weight of 21" torpedo tube installed anywhere on deck.
Nuclear explosions (even if the little dinghy wasn't actively involved in military actions) were also not covered.
But all should heed the commandment that all hype on the internet of things shall be repeated threefold!
And there shall be a great rejoicing!
(Armouries chapter 6, verse 66)
A step in the right direction that might actually pass through Congress. Strange days indeed. I am tempted to look out for airborne bacon, much as I applaud the initiative.
Easy - wave a magnet near it, if it interacts then it's irony, otherwise it's sarcasm.
Sounds very much like my old mate Glod Glodson. Never very good at quaffing (too much beer hit the mouth), but forges a mean dwarf bread
Yummy, I'll have one with smoked salmon
Darn, I'm hungry now
And what about the kangaroos?
The reason we often do not want truly random numbers is that we want to be able to generate the same sequence again with the same seed (or set of seeds). If we have truly random bits, and want to use that for encryption, we must pass the whole sequence to the receiver through a secure channel (i.e. we are using a one-time pad). Very secure if we can pass the pad safely to the receiver.
In the past linear congruential RNGs (shudder) were often combined (it's even Numerical Recipes) by taking the "better" higher order bytes of two different ones and concatenating them, because the lower order bits were not very random at all (the least significant goes 0,1,0,1,0,1,0,1,0,1,0,1,0,1,.... if you have got it right, otherwise it goes 0,0,0,0,0,... or 1,1,1,1,1,...). This shows that the basic idea is certainly not new, and for certain (toy) problems it may well suffice. What apparently is new is a proof of method to combine two reliably (still have to read the paper properly). Proof is a thing that carries rather more weight in science than just a nice (and plausible, or even obvious) idea.
Well done those engineers. Of course we knew they could do it, they have done it many times before, but an inaugural launch must mean lots more than usual can go wrong. I do not doubt some glasses of vodka were raised afterwards, and justly so!
I gather John Cleese was an option at one stage:
"Right! Now turn left!"
I bet he could handle swearing back at the driver as well. Battery sergeant major 'Shut up' Williams could do that nicely too:
"I'll make you turn left so fast YOUR FEET WON'T TOUCH THE GROUND!!!"
Megaphone not really needed, I suppose
I didn't get that pop-up. Looks like GWX control panel is working.
Win 10 may be better on various fronts, but I resent the way they are trying to force feed us the OS, as much as I resent the data slurping and forced upgrades embedded in it. I have several data capture applications that work under Win 7 and 8.X. When capturing a long sequence of data (like the 176 GB from the Mercury transit), I do not want this interrupted by some upgrade MS foists upon me. I do tend to keep my system updated, but I also do want some degree of control.
Couldn't we make an even bigger balloon by filling it with all the hot gases produced by politicians of all nations?
On the other hand, maybe it wouldn't get off the ground, just as most ideas vented by said politicians.
More seriously: good work from NASA getting the balloon launched after all.
No, no, no!
It's "One, two, many, LOTS"
Didn't you listen to sgt. Detritus?
does that make you a spin doctor?
Sorry, couldn't resist.
OK, time to go. My hat (genuine Panama) and coat please
All we need now is sharks to mount them
the forecast is clear over here in the north of the Netherlands! What next, flying pigs?
Of, course, the more Ecksian approach is to send anyone who gets elected straight to jail, on the practical basis that this saves time
Doffs hat (panama today) to the memory of the late, great Terry Pratchett
Staying with the HHG theme: this just proves that those people who most want to rule people are ipso facto those least suited for the job. So maybe the president's job is to distract people from where the actual power is. Donald Trump could be as successful as Zaphod Beeblebrox in that case.
Or wasn't he?
I know, I know, I know my hair's on fire.
Your face is melting....
Did you know that?
(Doffs hat (Tilley today) to Loudon Wainwright III, and is outahere)
Unless it's "Nein! Nein! Nein! Nein! Nein!!!"
I think they have reached that point
Is this Turing complete?
Here's another of those self-satisfied doors. I can tell it's going to open by the intolerable air of smugness it suddenly generates
Or simply: "Ook!"
Darn, no UU librarian icon
That is bloody brilliant! It has thoroughly cheered me up. It is almost as bad as the "Share and Enjoy" song sung by robots with their voice boxes exactly one flattened fifth out of tune. I'll certainly raise a glass to this
Well done those engineers!
Hey, market forces alive and kicking in the USA, and in government procurement, no less!
Big thumbs up to the SpaceX guys for making it happen
Pork pies feature in there somewhere, I am sure
"In fact, at least one child was initially raised as a native speaker of Klingon."
Does the "initially" mean that some child-care agency stepped in, or did the parents come to their senses? I am quite a Lord of the Rings (the books), and Discworld fan, but I didn't name my kids Frodo, Galadriel, Havelock, Carrot, or Glod, nor did I teach them Quenya, Sindarin or Adunaic. I certainly wouldn't dream of teaching those as their first language.
I prefer to just stick a fish in their ear. Works for me and my friend Ford Prefect
We are currently working on new fast particle tracking and track reconstruction software for a different detector, but I might well check out these data to see if we can apply our algorithms to this work as well.Should keep a couple of students out of mischief
it reminds me of the Apollo era of my youth, and puts a smile on my face. Wonderful really to see a Soyuz lift off a western satellite. It shows that despite the troubles we still have, differences can be overcome.
You could of course argue that free market forces simply made the Soyuz the best bang (or actually, "not bang", the last thing they want to see is a rocket go bang) for your buck. However, in 1969, as I sat watching the moon landing WAY past my normal bedtime, these free market forces weren't allowed to work.
So, I'll raise a pint to the successful launch, and further collaboration (there are worse causes).
À votre santé!
ONLY throwing capacity at any problem might not be optimal, but with the sheer volume of data processed in many applications, capacity is certainly needed. At the risk of winning a prize for pointing out the bleedin' obvious: you need to find the right tools first, and then assess how much compute power you need, given the optimal tools. Big data really requires you to think hard about tooling. I have seen people throw weeks of compute power of a large section of a Blue Gene machine at a problem that the right algorithm could solve in a couple of hours on a desktop PC. This wasn't even a big data problem, but it really demonstrated the difference in performance between O(N2) and O(N) algorithms.
Of course, in many cases you must also wonder whether you really need all that big data. Bigger isn't necessarily better
It is indeed no worse than the X-factor or The Voice of <Insert Name Here>, and those DO drag on for months. I am fine with people watching those programmes as long as they do not expect me to.
You certainly earned your pint!
I work in IT end even I'm not that sad. Anyway, it can't lift a pint, so is disqualified straight out the gate."
My thoughts exactly. These students may be too young to remember Sirius Cybernetics "Your plastic pall who's fun to be with" definition of a robot, i.e. they do not know their classics, and will probably be the first against the wall when the revolution comes, as a consequence.
The drone might be able to lift the miserly little glasses they sell beer in here in the Netherlands, however. Fortunately I have found a pub where they sell good beer in proper glasses (see icon).
Maybe he mean 443 Hurts (SI unit for cattle prods and tazers) rather than Hertz
I once had a scientologist wanting to inflict a questionnaire on me, so, being a good sport, I went along with it. Answering all the loaded questions in slowly increasing psychopath mode wasn't the only thing that got to him. I think it was the combination of my slightly too bright smile, the way I kept staring fixedly at his right ear, and developing a slight twitch in my left eye that really did it. I was careful not to overdo it, I just subtly built it up. He bolted at the end.
I had just been rehearsing a part as an insane Columbian taxi driver in a student play, so I could keep the act up all day, if needed
Lovely episode. I must say the line:
"Well the only way we can cool it down quickly will be to bring it into contact with something cool with a dense thermal mass I guess,"
had me expecting the boss ending up with burn marks on his forehead. The word "dense" must have triggered that mental image, but I suppose the world "cool" would argue against it.
I do like the notion of a cooling hammer, and my 2.7 lb lump hammer I have lying around the office for demonstration purposes during certain computer vision lectures might be assigned a new role
Antique? I have still got an 8" floppy disk lying around, with a whole 128 kB of storage (CP/M 2.0 from Digital Research is on it, according to the label).
128MB USB stick antique! Youth these days
Erm, .... has anybody got an 8" floppy drive with USB interface lying around?
If 3D XPOINT is a lot cheaper than the DRAM + NAND backup solution it does become interesting, even if its speed isn't quite as high. Not sure it is, however.
What were they thinking?"
There are two option:
a) Not a lot. This assumes no malice in the perpetrator
b) They thought they could get away with it. That implies malice
In the first case the person may not be suitable for working at the police.
In the second place the person is certainly not suitable for working at the police
Well, anything could be evidence of a crime, couldn't it? Every humorous video of a kitten might have hidden information concerning some heinous terrorist plot. Storing only part of the information on the interwebs is really not enough! We should demand that the US government retain ALL data generated anywhere. There might be a slight storage problem, of course ......
Not sure I will upgrade my M8 just yet. I rather like its 2 day battery life (even after 2 years) under my usage conditions, and more importantly, using it in the kitchen to blare out Rammstein, Blue Oyster Cult, System of a Down, Rory Gallagher, or Rush. Clears the kitchen in no time, so I can cook in peace. Very soothing ....
Should it give up the ghost any time soon, I will turn elsewhere, it would seem. Pity, I always liked my HTCs (starting from the old Desire)
And here I was thinking that it was less likely to contract an STD from watching porn than from actually having sex (especially if you haven't educated kids properly).
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