Search found 942 matches

by Minerva
Mon Feb 17, 2014 12:13 pm UTC
Forum: News & Articles
Topic: Three men to stand trial for stealing food from a bin
Replies: 23
Views: 5065

Re: Three men to stand trial for stealing food from a bin

http://www.theguardian.com/uk-news/2014/jan/28/three-charged-vagrancy-act-food-skip-iceland It is expected Paul May, a freelance web designer, will argue that he was taking the food because he needed it to eat and does not consider he has done anything illegal or dishonest in removing food destined ...
by Minerva
Mon Feb 10, 2014 6:15 am UTC
Forum: Science
Topic: Using inductive charging as an internet connection.
Replies: 6
Views: 2607

Re: Using inductive charging as an internet connection.

As required by the Ethernet specification, almost every Ethernet device actually already incorporates a transformer, which galvanically isolates the differential ethernet signals, providing common-mode rejection to deal with the problem of different ground potentials on different ethernet devices on...
by Minerva
Tue Feb 04, 2014 8:26 am UTC
Forum: Science
Topic: Combining Volumes don't add up?
Replies: 25
Views: 6737

Re: Combining Volumes don't add up?

Barman, I'll have 150 megaparsec-barns of beer.
by Minerva
Tue Feb 04, 2014 8:17 am UTC
Forum: Science
Topic: Can you (passively) heat an object hotter than your source?
Replies: 98
Views: 26898

Re: Can you (passively) heat an object hotter than your sour

Heat can never pass from a colder to a warmer body without some other change, connected therewith, occurring at the same time. Heat cannot spontaneously flow from cold regions to hot regions without external work being performed on the system. That's the second law of thermodynamics, in the form in ...
by Minerva
Sun Dec 08, 2013 4:02 pm UTC
Forum: News & Articles
Topic: Medical radioactive waste stolen in Mexico
Replies: 45
Views: 8208

Re: Medical radioactive waste stolen in Mexico

I'm not sure what to make of this situation. It's hard to process the information to find consistent factual details. Here's a picture of the Mexico device - the head of a partially dismantled radiotherapy machine. http://news.bbcimg.co.uk/media/images/71526000/jpg/_71526608_71526607.jpg http://news...
by Minerva
Thu Oct 17, 2013 7:19 am UTC
Forum: Science
Topic: Net Positive Fusion Reaction?
Replies: 18
Views: 4936

Re: Net Positive Fusion Reaction?

NIF is not a power plant, or a prototype towards developing a power plant. Its main purpose is to provide a small, laboratory scale model of the physics of radiation-driven inertial confinement fusion, a model of the physics of thermonuclear weapons. The energy released from fusion in the hohlraum i...
by Minerva
Thu Oct 17, 2013 7:02 am UTC
Forum: Science
Topic: electron degeneracy, neutron degeneracy, and pressure?
Replies: 11
Views: 4475

Re: electron degeneracy, neutron degeneracy, and pressure?

The hydrostatic equation that describes neutron-degenerate stuff is the Tolman–Oppenheimer–Volkoff equation, which is analogous to the hydrostatic equation derived by Chandrasekhar for electron-degenerate matter. This gives rise to the Tolman–Oppenheimer–Volkoff limit to the maximum mass of a neutro...
by Minerva
Sat Aug 10, 2013 4:11 pm UTC
Forum: Science
Topic: why are uranium centrifuge cascades run in parallel?
Replies: 14
Views: 6174

Re: why are uranium centrifuge cascades run in parallel?

As with just about all engineering, there are different tradeoffs between different factors. What's the desired enrichment level of the uranium product. Do you need to vary the enrichment level for the production of different enriched uranium product for different applications? How do you optimise t...
by Minerva
Sun Aug 04, 2013 10:14 am UTC
Forum: Science
Topic: An altrenative rocket technology idea
Replies: 24
Views: 10848

Re: An altrenative rocket technology idea

Basically, pre-mixed, pre-combined stoichiometric hydrogen and oxygen = dangerous as all hell. The slightest ignition source and boom. What you're talking about almost sounds like a chemical version of Project Orion style pulse propulsion. http://www.youtube.com/watch?v=v4k_YZAXSEI (If you don't hav...
by Minerva
Sun Aug 04, 2013 10:03 am UTC
Forum: Science
Topic: Extracting energy from a permanent magnet
Replies: 66
Views: 42988

Re: Extracting energy from a permanent magnet

A magnetic field does not store energy. Guys at CERN also thought so, until a faulty coil caused the field of one of their superconducting magnets to collapse and blew a 10-ton machine apart :? An electromagnet (superconducting or not, doesn't really matter for our purposes here) stores energy in i...
by Minerva
Sun Aug 04, 2013 9:52 am UTC
Forum: Science
Topic: Capacity of a superconducting loop?
Replies: 14
Views: 8240

Re: Capacity of a superconducting loop?

It's impossible to find superconductors today that have a combination of high critical temperature, high critical field, and ease of large-scale manufacturing into wire or tape suitable for constructing coils with. A material like that usable even at 77K would revolutionise the cost and usability of...
by Minerva
Sat Aug 03, 2013 7:18 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1246: "Pale Blue Dot"
Replies: 72
Views: 19726

Re: 1246: "Pale Blue Dot"

Just in case there is any chance that some of you might have had creationist home-schooling parents or something, and just in case you haven't read Pale Blue Dot , obviously that's a problem and we'll need to rectify that. I recommend the soothing yoomanism of the Carl-read audiobook version over th...
by Minerva
Mon Apr 15, 2013 1:51 am UTC
Forum: News & Articles
Topic: Man arrested because his phone could be a weapon
Replies: 27
Views: 6230

Re: Man arrested because his phone could be a weapon

Look up pictures of those "cellphone guns". They are a distinctive looking ugly rendition of a brick phone circa 1990, pretty easy to spot. I'd like to see any example of a gun with a size and shape realistically comparable to a modern smartphone... especially one that actually functions a...
by Minerva
Sun Apr 14, 2013 3:59 pm UTC
Forum: Science
Topic: Worst thing you've seen in a lab
Replies: 256
Views: 233170

Re: Worst thing you've seen in a lab

This is a brilliant example of the absolutely useless, ridiculous lawyer-phobic rubbish that is the MSDS. https://jr.chemwatch.net/cg3/msds.exe?mode=SAP&passop=checkpass&user=officemaxbp&pwd=fe79rs&partno=2521334 "If skin contact occurs: Immediately remove all contaminated cloth...
by Minerva
Sun Apr 14, 2013 3:46 pm UTC
Forum: Science
Topic: Have you ever worked with hydrofluoric acid?
Replies: 30
Views: 13148

Re: Have you ever worked with hydrofluoric acid?

To get a good idea of how to work safely (and this is true of essentially all lab safety), try reading the documented accounts of how and why things have gone very wrong, to get an idea of where the real risks are and how not to do it. For example: 100-200 ml of 70% HF spilled across only 9% of your...
by Minerva
Sun Apr 14, 2013 3:16 pm UTC
Forum: Science
Topic: Did the Alpha Magnetic Spectrometer really cost $2 billion?
Replies: 4
Views: 1548

Re: Did the Alpha Magnetic Spectrometer really cost $2 billi

They had to put in a lot of work to lobby Congress just to get one extra special Shuttle flight just to get it launched. Once they realised there would be no more Shuttle, they realised that repair and maintenance would be extremely limited. It would possibly never be able to be returned to Earth or...
by Minerva
Sun Apr 14, 2013 3:06 pm UTC
Forum: Science
Topic: Sun as final storage for radwaste?
Replies: 134
Views: 27941

Re: Sun as final storage for radwaste?

Why don't we send radioactive waste into space, or into the Sun? A common answer that people often come up with is that we can't do that because it would be too dangerous. The rocket could blow up and radioactivity would be scattered everywhere! However, that's not a real problem. We can quite easil...
by Minerva
Sun Apr 14, 2013 11:35 am UTC
Forum: Science
Topic: Confusion about hertz and radians
Replies: 24
Views: 6931

Re: Confusion about hertz and radians

Angular velocity (usually symbolised ω) is measured in rad/s, assuming SI base units. If you're given in a frequency measured in Hz, in the context of electronics at least, you can remember that 1 Hz is one "cycle per second" - i.e. 2π rad/s. Therefore you can remember that ω (rad/s) = 2πf...
by Minerva
Sat Dec 29, 2012 4:46 pm UTC
Forum: Hardware
Topic: Open-hardware gamma spectrometer
Replies: 2
Views: 4850

Open-hardware gamma spectrometer

This is a little something I'm working on. It's still very rough and immature at this stage and the PCB layout hasn't been done yet, and no real prototype yet and no software. https://github.com/lukeweston/GammaSpectrometer/blob/master/GammaSpectrometer-schematic.pdf (For the GitHub noobs, remember ...
by Minerva
Sat Dec 29, 2012 8:21 am UTC
Forum: Science
Topic: How can I tell if this is really magnesium citrate?
Replies: 7
Views: 4012

Re: How can I tell if this is really magnesium cirtate?

This might give you some ideas about how you might perform a wet-chemistry style determination of the presence of Mg. (Assuming you don't have access to some sort of atomic spectroscopy, it would need to be done via some sort of chemistry or gravitometry approach.) http://chemlab.truman.edu/CHEM222m...
by Minerva
Mon Oct 08, 2012 4:10 pm UTC
Forum: Movies and TV Shows
Topic: Breaking Bard
Replies: 209
Views: 75225

Re: Breaking Bard

As a general rule, the chemistry stuff in Breaking Bad is usually pretty good and pretty realistic.
by Minerva
Mon Oct 08, 2012 4:35 am UTC
Forum: News & Articles
Topic: Russia declassifies enormous deposit of diamonds
Replies: 31
Views: 6241

Re: Russia declassifies enormous deposit of diamonds

I would happily wear jewellery with synthetic diamonds, or give them to a loved one (assuming that she "gets it" and doesn't just think I'm cheap.) What a lovely symbol of science and technology.
by Minerva
Tue Aug 28, 2012 6:15 pm UTC
Forum: News & Articles
Topic: In other news... (humorous news items)
Replies: 15191
Views: 2705197

Re: In other news... (humorous news items, etc)

http://www.foxnews.com/health/2012/08/2 ... p=obinsite

Uganda man breaks into a local hospital and steals a patient's phone.

Specifically, he breaks into the Ebola isolation ward to steal a patient's phone.

Brilliant.
by Minerva
Sun Aug 26, 2012 6:11 pm UTC
Forum: News & Articles
Topic: RIP Neil Armstrong
Replies: 33
Views: 5838

Re: RIP Neil Armstrong

SlyReaper wrote:Spoilered for despair:

Spoiler:
Image


*farnsworth* I don't want to live on this planet any more.


Every one of these people needs to be punched in the face by Buzz Aldrin.
by Minerva
Sun Aug 26, 2012 11:29 am UTC
Forum: Science
Topic: Worst thing you've seen in a lab
Replies: 256
Views: 233170

Re: Worst thing you've seen in a lab

Jorpho wrote:Heh. Maybe the USP is in cahoots with the Pt crucible makers!


Oh noes, it's a Big Pharmacopoeia conspiracy!
by Minerva
Sat Aug 25, 2012 6:48 am UTC
Forum: Serious Business
Topic: Is it possible to have a rational debate on global warming?
Replies: 1714
Views: 319246

Re: Is it possible to have a rational debate on global warmi

It's impossible to have a rational debate. When anybody who is scientifically sensible and scientifically literate asks questions in any way that doesn't agree with the "Green" activists - like Freeman Dyson for example - they're immediately shot down and called deniers. Most "green&q...
by Minerva
Wed Aug 22, 2012 4:47 am UTC
Forum: News & Articles
Topic: Radiation Chart
Replies: 79
Views: 29614

Re: Radiation Chart

Cell phone radiation is too new a phenomenon to know if there is a mechanism we are unaware of that could make it dangerous. If such a mechanism existed, it would be extremely interesting, because it would seem to be contrary to a lot of established basic physics and chemistry. Basically, with any ...
by Minerva
Wed Aug 22, 2012 4:38 am UTC
Forum: Science
Topic: Magnetic Shield Ideas
Replies: 10
Views: 2537

Re: Magnetic Shield Ideas

That's what superconductors are for. Now if you could just fine one that works at room temperature... still subject to material strengths. as you run more current through a loop of superconductor the loop has to withstand more and more force from it's own magnetic field eventually tearing itself ap...
by Minerva
Mon Aug 20, 2012 6:15 am UTC
Forum: News & Articles
Topic: Radiation Chart
Replies: 79
Views: 29614

Re: Radiation Chart

What does the psychological epidemiology look like at Fukushima for psychological effects caused by stress and fear of radiation after we've corrected for the confounding factor of an enormous devastating earthquake and tsunami destroying everything, destroying families and communities and homes and...
by Minerva
Mon Aug 06, 2012 2:24 pm UTC
Forum: Science
Topic: Tritium and fusion power
Replies: 3
Views: 2103

Re: Tritium and fusion power

Any practical D-T fusion power reactor must be a self-sustaining tritium breeder with a Li blanket, so its fuels are essentially lithium and deuterium. The natural abundance of 7Li is a lot larger than 6Li, but the 7Li cross section is a lot smaller than 6Li. But 7Li gives you back the extra neutron...
by Minerva
Mon Aug 06, 2012 2:14 pm UTC
Forum: Serious Business
Topic: Genetically Modified Food
Replies: 65
Views: 13635

Re: Genetically Modified Food

by Minerva
Mon Aug 06, 2012 9:32 am UTC
Forum: Serious Business
Topic: Bio-sabotage of a different sort
Replies: 13
Views: 3661

Re: Bio-sabotage of a different sort

The use of plant and animal pathogens - wheat rust, or foot-and-mouth disease - as biological weapons to disrupt and destroy economic agricultural productivity, or to disrupt food production - is certainly not a new concept, it's been around for a long time and thought about. In some cases agents li...
by Minerva
Mon Aug 06, 2012 9:21 am UTC
Forum: Serious Business
Topic: Genetically Modified Food
Replies: 65
Views: 13635

Re: Genetically Modified Food

Right now patent law is being shoehorned in to apply to GM but it was written for stamping widgets out in early factories, not self replicating organisms and it leads to crazy situations and companies like monsanto wielding the law like a club. The notion that novel varieties and breeds of plants a...
by Minerva
Sun Jul 29, 2012 3:27 pm UTC
Forum: Serious Business
Topic: Genetically Modified Food
Replies: 65
Views: 13635

Re: Genetically Modified Food

Depends what you mean by "carefully studied". Are you saying there should be full clinical trials like with drugs (IIRC 10+ years and $millions)? Or a few tests on rats to see if it is overtly poisonous? Or different guidelines depending on the modification (less rigorous if the gene came...
by Minerva
Tue Jul 10, 2012 4:05 am UTC
Forum: News & Articles
Topic: Hugs Bison detected at LHC
Replies: 43
Views: 12171

Re: Higgs Boson detected at LHC

http://motls.blogspot.com/2012/07/why-125-gev-higgs-boson-isnt-quite.html#more http://motls.blogspot.com/2012/07/higgs-discovery-chat-box.html#more Interesting paper referenced here: http://www.physicsforums.com/showthread.php?t=560031, prediction of a 126~ GeV Higgs and talk about minimal supersym...
by Minerva
Tue Jul 03, 2012 1:20 pm UTC
Forum: Hardware
Topic: Statham pressure transducer
Replies: 0
Views: 3469

Statham pressure transducer

So, I have some Statham pressure transducers. Rugged industrial/aerospace style one, somewhat old but in good condition. They looks somewhat similar to this one, with a 6-pin Amphenol milspec connector on the end. http://www.hutsvilleads.com/Downtown-Area/2003/Two-statham-pressure-transducers-0-100-...
by Minerva
Mon Jul 02, 2012 6:08 pm UTC
Forum: Science
Topic: #809 Los Alamos
Replies: 3
Views: 1585

Re: #809 Los Alamos

The definitive reading material on this subject is, of course, "Ignition of the atmosphere with nuclear bombs", by Teller, Konopinski and Marvin. http://www.fas.org/sgp/othergov/doe/lanl/docs1/00329010.pdf Read it :) This was researched, checked, and published well before the Trinity test ...
by Minerva
Fri Jun 15, 2012 6:59 am UTC
Forum: Science
Topic: What is this lab equipment called?
Replies: 8
Views: 3203

Re: What is this lab equipment called?

There are actually two similar looking but different pieces of equipment you've pictured here. The ones that are sort of pear shaped are separator funnels, used for separations such as liquid-liquid solvent extractions. The ones that are more sort of cylindrical shaped are addition funnels, used to ...
by Minerva
Wed May 16, 2012 3:05 pm UTC
Forum: Serious Business
Topic: What makes Royal families Royal?
Replies: 90
Views: 20183

Re: What makes Royal families Royal?

The Lizard People from the constellation Draco.

But sssh, don't tell anyone.
by Minerva
Mon Apr 09, 2012 9:26 am UTC
Forum: Serious Business
Topic: Nuclear energy
Replies: 545
Views: 90801

Re: Nuclear energy

It didn't turn out 'ok', it turned out about as worse as it possibly could have. That's the thing. Short of the reactor-core spontaneously achieving super-criticality (which is impossible), a LOCA and core meltdown It wasn't really a LOCA, was it? More like extended LOOP (loss of offsite power) and...

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