Search found 106 matches

by heydonms
Mon Sep 13, 2010 6:25 am UTC
Forum: Science
Topic: [School] Carbon Monoxide generation?
Replies: 9
Views: 2241

Re: [School] Carbon Monoxide generation?

I don't think CO2 would be the best choice. Isn't an increased level of CO2 what triggers the feeling that you need to exhale? By increasing the CO2 concentration, even if there is plenty of oxygen present you will cause the subject to feel that it is suffocating. I would go N2 personally.
by heydonms
Fri Apr 30, 2010 3:22 am UTC
Forum: Science
Topic: Naturalness of homosexual behavior
Replies: 41
Views: 7438

Re: God vs. Science paper

considering how much choice we have in any of our biological urges. I can eat when I'm not hungry, and not eat when I am. Note that he said urges not actions. I can not have sex with someone I am attracted to, and I suspect I could have sex with someone I'm not attracted to. Can you stop feeling hu...
by heydonms
Sun Apr 25, 2010 12:22 pm UTC
Forum: Science
Topic: I don't understand logic and I don't know why...
Replies: 11
Views: 1535

Re: I don't understand logic and I don't know why...

Charlie! wrote:Pff, they both start with L


That was enough to throw me as well actually.

The number of times I read over it checking if I had it backwards both before handing it in and then when I got it back and they were wrong...*shudder*
by heydonms
Sat Apr 24, 2010 12:35 pm UTC
Forum: Science
Topic: I don't understand logic and I don't know why...
Replies: 11
Views: 1535

Re: I don't understand logic and I don't know why...

there are lots of statements you could make, most of which involve finding some superset of not union member/votes labor (or a subset of the complement) Gotcha! That is what I was doing for the third answer, I didn't think of going beyond the terms used in the question though. Well, I'm now fairly ...
by heydonms
Sat Apr 24, 2010 10:27 am UTC
Forum: Science
Topic: I don't understand logic and I don't know why...
Replies: 11
Views: 1535

Re: I don't understand logic and I don't know why...

I probably can't use that to argue for more marks on my assignment, but it is nice to know that at least one person agrees with me.

I would still be interested to know if anyone can come up with any other statements that aren't equivalent to any of my answers (although I don't think there are any).
by heydonms
Sat Apr 24, 2010 9:09 am UTC
Forum: Science
Topic: I don't understand logic and I don't know why...
Replies: 11
Views: 1535

Re: I don't understand logic and I don't know why...

Charlie! wrote:You have some guy who is (not union) and (votes liberal).


The guy in the question votes Labor not Liberal.
by heydonms
Sat Apr 24, 2010 8:51 am UTC
Forum: Science
Topic: I don't understand logic and I don't know why...
Replies: 11
Views: 1535

I don't understand logic and I don't know why...

Background on Australian political system: Australia has two major parties, Labor and Liberal, as well as a dozen or so smaller parties and a heap of independents. When you actually vote you can number various people/parties in order of preference. Typically if someone says "I vote for <x>"...
by heydonms
Wed Apr 21, 2010 2:41 am UTC
Forum: Hardware
Topic: Help identifying cable
Replies: 5
Views: 1366

Re: Help identifying cable

Definitely not BNC, it is threaded.

I would tend to agree with N-type because it looks fairly large. Failing that it could be TNC.
by heydonms
Wed Apr 21, 2010 2:09 am UTC
Forum: General
Topic: How do you find where you want to live?
Replies: 18
Views: 1331

Re: How do you find where you want to live?

I've found that vacations don't give you a proper feel for what it would be like to live someplace. What is your idea of a vacation? Do you go to a hotel and sit by the pool until the tour bus arrives to pick you up? or do you get out and actually see the place? I went on a three week holiday in Ne...
by heydonms
Wed Apr 21, 2010 1:48 am UTC
Forum: General
Topic: Let's Say You've Gone Back in Time
Replies: 42
Views: 6120

Re: Let's Say You've Gone Back in Time

Copper doesn't work too well as a conductor unless it's insulated. Up until recently (about 50ish years ago at a guess) telephone lines were insulated with paper and then wrapped in lead to keep out water/rats/etc. I think they would have had lead at that point. Papyrus or leather would probably be...
by heydonms
Fri Mar 26, 2010 3:31 am UTC
Forum: News & Articles
Topic: The Perry Bible Fellowship goes dark, dies unsung
Replies: 23
Views: 5188

Re: The Perry Bible Fellowship goes dark, dies unsung

The domain has expired, the hosting hasn't.

208.109.110.183

Create a hosts entry.
by heydonms
Tue Jan 26, 2010 12:12 am UTC
Forum: General
Topic: Rechargeable batteries
Replies: 15
Views: 2041

Re: Rechargeable batteries

There are no miracle cures. You might try a few tricks and get a few more minutes out of it but to actually fix it you are looking at either buying a new battery pack or dismantling it and replacing the cells. A lot of laptops use fairly common cells, which can be bought for a fair bit less than a n...
by heydonms
Sun Jan 24, 2010 2:34 am UTC
Forum: General
Topic: Rechargeable batteries
Replies: 15
Views: 2041

Re: Rechargeable batteries

you don't want to always charge if the discharge was less than, say 50% you can estimate how much charge was drawn from the battery This really isn't necessary with any modern, decent equipment. NiCad, NiMH and lithium batteries undergo quite distinct changes when they are fully charged, it is quit...
by heydonms
Fri Jan 22, 2010 12:17 am UTC
Forum: General
Topic: Rechargeable batteries
Replies: 15
Views: 2041

Re: Rechargeable batteries

NiMH batteries will hold charges longer and a greater charge when fully-cycled. I'm fairly sure this isn't (entirely) correct. NiCad did have some serious problems in very specific circumstances (e.g. solar powered satellites where the power usage and charge/discharge schedule is incredibly consist...
by heydonms
Thu Jan 21, 2010 3:54 am UTC
Forum: General
Topic: Rechargeable batteries
Replies: 15
Views: 2041

Re: Rechargeable batteries

These sorts of instructions might be common on a $10 remote control car, but I would be rather surprised if your mobile phone recommended this sort of treatment. "Do not charge the battery until it is fully discharged" "Do not interrupt the charging of the battery until it is fully ch...
by heydonms
Tue Jan 19, 2010 7:53 am UTC
Forum: Science
Topic: Home Laboratories!
Replies: 15
Views: 2174

Re: Home Laboratories!

I'm going to go out on a limb here and assert that someone who is clumsy enough to cause an accident is likely uninformed enough to tell the difference between simply unpleasant and dangerous. Anyone who has a sufficient understanding of chemistry instantly gains perfect hand-eye coordination, neve...
by heydonms
Mon Jan 18, 2010 7:47 am UTC
Forum: Hardware
Topic: Alternative to expensive service to get data off crashed HD?
Replies: 10
Views: 1655

Re: Alternative to expensive service to get data off crashed HD?

The freezer trick (as well as the spin-the-drive-in-the-opposite-direction-to-what-the-platters-spin trick and the slam-it-hard-onto-the-desk-and-hope-the-heads-were-parked trick) can help when the bearings are seized or the motor is struggling to start but won't typically help if the problem is in ...
by heydonms
Wed Jan 06, 2010 8:38 am UTC
Forum: Hardware
Topic: Anyone have an Arduino?
Replies: 27
Views: 5497

Re: Anyone have an Arduino?

Solenoids appear to produce nasty peak voltages around them, so they have to be separated from the microcontroller. A snubber diode will fix that easily enough. A bigger problem is that the uC won't be able to source enough current to operate the solenoids directly, you will need some sort of trans...
by heydonms
Wed Dec 16, 2009 5:20 am UTC
Forum: The Help Desk
Topic: A sane way to install Puppy on that old G4?
Replies: 3
Views: 693

Re: A sane way to install Puppy on that old G4?

This would be fine, except that (correct me if I'm wrong) it will only build for the PPC architecture if I build it on a PPC computer. It is possible to setup a cross-compiler, (I had one a while ago so I could compile software for my MIPS router on x86) but it is a bit of work, so probably not the...
by heydonms
Mon Nov 30, 2009 5:09 am UTC
Forum: Science
Topic: backyard electroplating: viability and safety (and legality)
Replies: 4
Views: 1059

Re: backyard electroplating: viability and safety (and legality)

I've made copper (II) chloride by reacting copper (II) oxide with HCl. The only real problem I ran into was that it also produced a fair amount of insoluble copper (I) chloride so it was rather inefficient, I think there are some tricks to help with that, but I haven't really looked into the details.
by heydonms
Mon Nov 30, 2009 3:59 am UTC
Forum: General
Topic: Fun Bike-Theft Deterrents :D
Replies: 62
Views: 5898

Re: Fun Bike-Theft Deterrents :D

A mate of mine is a bike courier, one of the bikes he uses has fixed gears (i.e. no ratchet mechanism in the wheel). Apparently one of the benefits of it is that you can leave it out the front of a building while you go inside and if it does get stolen, you will find it a few meters down the street ...
by heydonms
Mon Nov 23, 2009 6:19 am UTC
Forum: News & Articles
Topic: Peruvian gang murders people for their fat
Replies: 37
Views: 3304

Re: Peruvian gang murders people for their fat

The translation isn't great but it looks like the locals believe this is actually be a case of lazy and/or crooked cops ignoring drug related murders by blaming an urban legend. http://translate.google.com/translate?hl=en&langpair=es|en&u=http://www.elmorsa.pe/2009/11/20/el-ataque-de-los-pis...
by heydonms
Thu Nov 19, 2009 5:20 am UTC
Forum: Science
Topic: Electrolysis tin plating of copper.
Replies: 11
Views: 2757

Re: Electrolysis tin plating of copper.

Boric acid based poisons don't seem to be too popular around here, but my local chemist ordered in 500g of it for me (it was a bit of a rip off, but since I couldn't get it anywhere else at the time I just accepted it). If you can't track any down, PM me (or if you just want to know if it will work ...
by heydonms
Thu Nov 19, 2009 5:11 am UTC
Forum: Hardware
Topic: UPS on Linux
Replies: 4
Views: 943

Re: UPS on Linux

I'm using a couple of Eaton Powerware UPSs and a Powershield with NUT. The Eaton is USB, Powershield is RS232, both were fairly easy to setup. I think I am missing some of the fancier capabilities (multiple segments on the Eaton, battery %age on the Powershield, etc) but I only need the basics so I ...
by heydonms
Wed Nov 18, 2009 3:18 am UTC
Forum: Science
Topic: Electric Fence Question
Replies: 8
Views: 1016

Re: Electric Fence Question

I can feel a tingle about half a cm away from my jacob's ladder (it could probably zap me from a bit further away if the other electrode wasn't close and a better ground than I am), so I guess it depends on what you consider "remote". 10,000V isn't that much when you are talking about crea...
by heydonms
Thu Nov 12, 2009 8:46 am UTC
Forum: Science
Topic: Rocketry without fire danger?
Replies: 20
Views: 2021

Re: Rocketry without fire danger?

When you say you have considered air pressure PET bottle rockets are you talking a bike pump and a cork or something like this:
http://home.people.net.au/~aircommand/index.htm

Those things look like they would have a bit more kick than most of the small CO2 canisters I have come across.
by heydonms
Tue Oct 27, 2009 8:15 am UTC
Forum: Science
Topic: making stuff explode
Replies: 12
Views: 1334

Re: making stuff explode

I suspect there are a few areas where you need to make changes. I can offer some advice on improving your powder as well as a few resources you might want to have a look at, PM me with more details of what you are trying to achieve and the methods you are using. I don't want missing limbs on my cons...
by heydonms
Thu Oct 15, 2009 6:56 am UTC
Forum: Hardware
Topic: Construct: Screaming Toaster?
Replies: 6
Views: 2246

Re: Construct: Screaming Toaster?

Cannibalizing a screaming toy sounds like a good plan. If you get a reasonably large toaster so that the electronics aren't right up against the element, make a simple heat shield out of some sheet metal and don't run the toaster for hours on end, I don't think you will have too much trouble with he...
by heydonms
Wed Oct 14, 2009 7:22 am UTC
Forum: Hardware
Topic: Construct: Screaming Toaster?
Replies: 6
Views: 2246

Re: Construct: Screaming Toaster?

A toaster is a fairly simple device. The way I imagine it works is that the spring loaded tray presses on a momentary switch while it is down, a timer circuit is activated and after some time it switches a solenoid which releases the tray and thereby turns the whole thing off. I think the simplest s...
by heydonms
Tue Oct 06, 2009 4:36 am UTC
Forum: Serious Business
Topic: Cremation or Burial?
Replies: 63
Views: 9292

Re: Cremation or Burial?

Sure, a funeral and grave is a way to keep your memory alive Personally I think it is a bit of a creepy way to keep someones memory alive. I would prefer for my family to remember me when thinking "That is where dad took us on a picnic" or "That is where we used to go boating" r...
by heydonms
Mon Oct 05, 2009 4:04 am UTC
Forum: Science
Topic: Homemade Rocket [Not the weapon]
Replies: 20
Views: 2526

Re: Homemade Rocket [Not the weapon]

OK sure, if you are hammering chlorate and sulfur into a steel tube you are asking for trouble, and if that is how things were done in the 50s then I certainly wouldn't recommend returning to their designs. Just because people did unsafe things in the past doesn't mean that the same risk exists for ...
by heydonms
Mon Oct 05, 2009 12:09 am UTC
Forum: Science
Topic: Homemade Rocket [Not the weapon]
Replies: 20
Views: 2526

Re: Homemade Rocket [Not the weapon]

Motors are a whole other story. Never try, ever, to make your own blackpowder, liquid fuel, or ammonium perchlorate (composite) propellants. Until the propellant is mixed, stabilized, cast, and put into a phenolic or aluminium case, it's explosive and rather dangerous. There are dozens of companies...
by heydonms
Fri Oct 02, 2009 8:51 am UTC
Forum: The Help Desk
Topic: Gaining admin rights on a LANed computer
Replies: 3
Views: 793

Re: Gaining admin rights on a LANed computer

A domain admin account would require a domain, which would require a server of some sort (Windows server or *nix & samba). You will need to find out what user the UPS runs the script as and make sure that user exists on each machine, has the same password on each machine and is a member of the a...
by heydonms
Thu Oct 01, 2009 5:11 am UTC
Forum: Science
Topic: Oxidising magnesium with acid at home
Replies: 4
Views: 961

Re: Oxidising magnesium with acid at home

Are you sure it is magnesium? When trying to differentiate scrap magnesium from aluminium a simple test is to scratch it up a bit and pour on some vinegar. Mg will bubble, Al wont. So vinegar should be enough to get a (slow) reaction. Maybe you need to scratch it up a bit first? Acetic acid boils at...
by heydonms
Wed Sep 30, 2009 6:58 am UTC
Forum: Science
Topic: Homemade Rocket [Not the weapon]
Replies: 20
Views: 2526

Re: Homemade Rocket [Not the weapon]

If you've got money to spend, you'd be better off getting a rocket kit off the shelf rather than screwing around with candy propellants or whatever. Pfft Where is the fun in that? No whacking stuff with big hammers, no making a horrible mess in the backyard, electric ignition means no exciting hang...
by heydonms
Wed Sep 30, 2009 12:26 am UTC
Forum: Science
Topic: Homemade Rocket [Not the weapon]
Replies: 20
Views: 2526

Re: Homemade Rocket [Not the weapon]

Sugar shot to space is looking to get into space using a sugar based propellant (the name kind of takes away the surprise from that statement doesn't it?). So far I don't think they have had a great deal of success, but there is some potential. If you aren't interested in making your life harder tha...
by heydonms
Thu Sep 24, 2009 1:54 pm UTC
Forum: Science
Topic: Diluting 18M Sulfuric acid to 6M in a volumetric flask?
Replies: 23
Views: 6113

Re: Diluting 18M Sulfuric acid to 6M in a volumetric flask?

Wait, normally if its that high, they would start off with crystals instead of acid, wouldn't it? Only if the lab was quite cold. Sulfuric is liquid at STP. And is the teacher serious? 18 M is a really high concentration... for a school. It does seem a little unusual to give concentrated acid to so...
by heydonms
Thu Sep 24, 2009 7:52 am UTC
Forum: Science
Topic: Diluting 18M Sulfuric acid to 6M in a volumetric flask?
Replies: 23
Views: 6113

Re: Diluting 18M Sulfuric acid to 6M in a volumetric flask?

You can also use a glass rod to reduce splashing.

Rather than just tipping from one container into another and letting the acid fall, you put a glass rod in or just above the container that you are pouring in to (use a retort stand if you like) and pour the acid slowly onto the rod.
by heydonms
Tue Sep 01, 2009 9:00 am UTC
Forum: Science
Topic: Nitrogen vs air
Replies: 21
Views: 3197

Re: Nitrogen vs air

This used to come up every other day on some of the auto forums I used to frequent. These are some notes I made from various sources: The question about nitrogen in tires has come up in other lists on the web as well. Let me clarrify a few points. 1. Air is 78% nitrogen, N2, and 21% oxygen, O2. So e...
by heydonms
Sat Aug 15, 2009 3:47 pm UTC
Forum: Science
Topic: black powder
Replies: 37
Views: 4416

Re: black powder

If you have a spindle and rammer you can use bentonite for the nozzles since you won't have to drill it. Some people use a silicon lubricant, but I don't think it is really necessary.

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