Search found 33 matches

by khakipuce
Thu Apr 26, 2018 11:13 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1985: "Meteorologist"
Replies: 54
Views: 14317

Re: 1985: "Meteorologist"

I've always assumed it's a forecast confidence measure. They run the forecast model with the range of possible inputs and if the various runs agree closely confidence and therefore the "% chance" is high, if they differ a lot then the chance is low. You can run the model for 1 hour ahead o...
by khakipuce
Fri Feb 12, 2016 1:18 pm UTC
Forum: Science
Topic: LIGO Gravity Waves: Questions and Answers
Replies: 49
Views: 9179

Re: LIGO Gravity Waves; how did they determine distance

I suspect different masses would have resulted in different frequencies. I would guess the distance was calculated based on the amplitude of the signal, and some trickery for redshift correction. It seems you have hit the nail on the head there (presumably causing your own gravity wave) - the link ...
by khakipuce
Fri Feb 12, 2016 11:40 am UTC
Forum: Science
Topic: LIGO Gravity Waves: Questions and Answers
Replies: 49
Views: 9179

LIGO Gravity Waves: Questions and Answers

I've merged the two LIGO threads, and further questions about it should go here. Apologies if it makes any of the responses unclear as to what they're replying to. - gmalivuk Yesterday's announcement on the detection of gravity waves had a lot of information, age, distance, masses of the two black ...
by khakipuce
Wed Dec 17, 2014 12:39 pm UTC
Forum: Science
Topic: Radio wave propagation in water
Replies: 5
Views: 2602

Re: Radio wave propagation in water

Yeah, OK, it was meant as an analogy rather than a mechanism
by khakipuce
Sun Dec 14, 2014 10:23 am UTC
Forum: Science
Topic: Radio wave propagation in water
Replies: 5
Views: 2602

Re: Radio wave propagation in water

Thanks, that is exactly what I was missing. I suppose it is kinda analogous to it being dark in the deep ocean, the light just gets absorbed.
by khakipuce
Fri Dec 12, 2014 9:02 am UTC
Forum: Science
Topic: Radio wave propagation in water
Replies: 5
Views: 2602

Radio wave propagation in water

I'm trying to get my head around radio wave propagation in conductive media such as water, saturated rock, etc. What I know is that propagation is poor but better at lower frequencies and this has something to do with "skin depth". I have read what I can on skin depth but I struggle to rel...
by khakipuce
Wed Apr 10, 2013 11:38 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1197: "All Adobe Updates"
Replies: 86
Views: 25969

Re: 1197: "All Adobe Updates"

So you click "download" and instead of an apology that they needed to update their poorly written software instead you get to sign away any rights you ever had to life an liberty by accepting a 257 page license agreement for an update to an updater that you never wanted in the first place.
by khakipuce
Thu Mar 28, 2013 9:58 pm UTC
Forum: Science
Topic: Gravity and work done
Replies: 4
Views: 1759

Re: Gravity and work done

Thanks for the comprehensive reply
by khakipuce
Tue Mar 26, 2013 7:26 pm UTC
Forum: Science
Topic: Gravity and work done
Replies: 4
Views: 1759

Re: Gravity and work done

Thanks for taking the time, seems to make sense to me, I hadn't considered it as part of a larger system
by khakipuce
Tue Mar 26, 2013 8:14 am UTC
Forum: Science
Topic: Gravity and work done
Replies: 4
Views: 1759

Gravity and work done

My unserstanding is that if I climb a mountain I do work and that increases the earth's gravitational energy. If I then jump off the mountain gravity pulls me back down and returns to it's lower energy level. Doe this then imply that a spaceship escaping earth's gravity, never to return, actually in...
by khakipuce
Fri Apr 08, 2011 8:54 pm UTC
Forum: Science
Topic: inertia and gravity
Replies: 9
Views: 2434

Re: inertia and gravity

Been mulling this over ... thoughtfully - you said there was no inertial force - however Newton said every action has an equal and opposite reaction, so since I have to exert a force to make something move, does that not mean that the stationary body is exerting a force? i.e an inertial force? rickd...
by khakipuce
Thu Apr 07, 2011 11:54 am UTC
Forum: Science
Topic: inertia and gravity
Replies: 9
Views: 2434

Re: inertia and gravity

Thanks for the replies
by khakipuce
Wed Apr 06, 2011 12:12 pm UTC
Forum: Coding
Topic: What can I do with coding skills?
Replies: 25
Views: 13016

Re: What can I do with coding skills?

Java just ain't that slow, often it's as fast as C and it's an awful lot cheaper to chuck more processing power at the problem than it is to spend weeks optimising. Especially when you consider that the out come of optimistion is uncertain.
by khakipuce
Tue Apr 05, 2011 9:04 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9990
Views: 2001897

Re: Coding: Fleeting Thoughts

I Use Eclipse 8-9 hours a day, best thing since sliced bread - I only start it up once each day so the start up time is not a big overhead - but the tools and plugins it has are the difference between a hammer and a fully kitted engineering workshop. You can do with one click stuff you would never d...
by khakipuce
Tue Apr 05, 2011 8:18 pm UTC
Forum: Coding
Topic: What can I do with coding skills?
Replies: 25
Views: 13016

Re: What can I do with coding skills?

Java is one of the most widely used languages in business these days. Everything from financial apps to CAD tools to some pretty heavy weight modelling software is written in Java (I know because over the last 10+ years I have coded all those things in Java for real commercial applications). Add to ...
by khakipuce
Tue Apr 05, 2011 8:09 pm UTC
Forum: Coding
Topic: How Do I Learn About [n]?
Replies: 183
Views: 385433

Re: How Do I Learn About [n]?

Does anyone have some good tutorial sites on programming java with a GUI? I'm used to using command line arguments or entering things through the console, but I'd like to expand what I know. I've heard some good things about NetBeans, but I've also heard people saying they didn't like it at all. I ...
by khakipuce
Tue Apr 05, 2011 8:02 pm UTC
Forum: Science
Topic: inertia and gravity
Replies: 9
Views: 2434

inertia and gravity

I'm probably missing something obvious but I was struck by the thought that gravity and inertia could be manfestations of the same force in a manner analogous to electicity and magnetism. Is this a possibility? What is the current thinking on inertia?
by khakipuce
Thu Apr 15, 2010 12:07 pm UTC
Forum: Science
Topic: Breaking Rocks
Replies: 13
Views: 1868

Re: Breaking Rocks

If all the energy of your hammer strike goes into a 1kg rock, and the same amount of energy from my hammer strike goes into a 10g rock, then the shock from my hammer strike is obviously going to do more damage to every part of that small rock than the shock from yours. Why is that confusing? It is ...
by khakipuce
Thu Apr 15, 2010 11:58 am UTC
Forum: Coding
Topic: Help with Keystrokes in Java?
Replies: 7
Views: 1339

Re: Help with Keystrokes in Java?

When i create a class to implments AbstractAction but that was not recieve the keypress action. I have checked my coding no problem at all.I don't understand then what problem is occurred? Make sure that what you called your keystroke and what you registered the action as are identical, inlcuding t...
by khakipuce
Wed Apr 14, 2010 11:23 am UTC
Forum: Science
Topic: Breaking Rocks
Replies: 13
Views: 1868

Re: Breaking Rocks

Thanks for the input. All the rocks are limestone from the same beds and I think I am digging in glacial boulder clay. You could have a point that the big ones are more homgenious/less fractured than the smaller ones, but they certainly all look similar close up. Re breaking the chemical bonds - yes...
by khakipuce
Tue Apr 13, 2010 7:32 pm UTC
Forum: Science
Topic: Breaking Rocks
Replies: 13
Views: 1868

Breaking Rocks

Have been digging a trench and have had to break up some rocks and I got tot thinking - why do I have to hit big rocks very hard with a big hammer to split them, where as I only have to hit small rocks much less to split them. I an guessing that hitting the rock causes cracks to propagate though it,...
by khakipuce
Tue Apr 13, 2010 7:10 pm UTC
Forum: General
Topic: Modern Art
Replies: 67
Views: 7367

Re: Modern Art

For the techies out there I think art is the mathematics of emotion. Surely on of the purposes of art (of any sort - visual, music, literature, etc) is to convey emotions. Mathematics is an abstract way of conveying some idea about the physical world, but we have no equivalent for feelings. I look a...
by khakipuce
Tue Apr 13, 2010 12:23 pm UTC
Forum: The Help Desk
Topic: Memory Errors
Replies: 8
Views: 945

Re: Laptop Spontaneously Powers Off

May not be related but I had a similar problem with an old laptop. It would boot up but as soon as I tried to do something useful it shutdown - even on Mains Power. Eventually I tracked it down to the battery (yes even on mains power), the battery which was long past holding change for any length of...
by khakipuce
Mon Apr 12, 2010 1:38 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720793

Re: RELATIVITY QUESTIONS! (and other common queries)

Eebster the Great: good reply, I think I am starting to see where you are coming from. But I suppose the crux of my issue (which I probably didn't articulate very well in the first place) is - what if time is not an independant dimention, but is just a function of distance and the fact that the spee...
by khakipuce
Sun Apr 11, 2010 7:24 pm UTC
Forum: Coding
Topic: Coding and evolution
Replies: 4
Views: 1064

Re: Coding and evolution

If you think about it, a computer program is just a large number stored in a binary file. You could skip the Visual Studio step and just write a large number in binary to the disk and try to run it. An exe has a certain header so it would be worth getting that right, but beyond that expect a lot of ...
by khakipuce
Sun Apr 11, 2010 7:17 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720793

Re: RELATIVITY QUESTIONS! (and other common queries)

Thanks for all the replies, however I have to say I still do not feel any the wiser. I am happy to accept that I am missing something, that is why I asked the question. Your system by contrast, can be reversed under the much less stringent "reverse all changes". No, that is not what I am s...
by khakipuce
Sat Apr 10, 2010 6:55 pm UTC
Forum: Coding
Topic: SEO
Replies: 3
Views: 3006

Re: SEO

Google is your friend, both in terms of googling for Search Engine Optimisation, turns up some good tutorials, and google it's self has a tutorial http://blog.hubspot.com/blog/tabid/6307/bid/1436/Shortest-Tutorial-Ever-on-SEO-Search-Engine-Optimization.aspx http://www.google.com/support/webmasters/b...
by khakipuce
Sat Apr 10, 2010 6:47 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720793

Re: RELATIVITY QUESTIONS! (and other common queries)

What does it mean to "propagate" in your system? Also, can you flesh out what your model is precisely proposing? How would you actually do the calculation for time dilation, for example? Propagate means to travel from one point in space to another. ... Second, note that the laws of physic...
by khakipuce
Thu Apr 08, 2010 7:43 pm UTC
Forum: The Help Desk
Topic: Website construction freeware.
Replies: 4
Views: 863

Re: Website construction freeware.

Word HTML is pretty awful, overly comples and liable to break. OpenOffice is free and makes a reasonable job of it.
by khakipuce
Thu Apr 08, 2010 7:35 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720793

Re: RELATIVITY QUESTIONS! (and other common queries)

Well more change could equate to more entropy, but generally let's say less like it was at the big bang.

Can it explain time dilation? Yes, I believe it can, simply because of increase in length, increase the length and the change has to propagate further.
by khakipuce
Thu Apr 08, 2010 12:24 pm UTC
Forum: Coding
Topic: Help with Keystrokes in Java?
Replies: 7
Views: 1339

Re: Help with Keystrokes in Java?

Since you said Applet, I assume you are using Swing to write a GUI. You need to add the keystrokes into the input map with something like: InputMap inputMap = this.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT); key = KeyStroke.getKeyStroke(KeyEvent.VK_Z, Event.CTRL_MASK); inputMap.put(k...
by khakipuce
Thu Apr 08, 2010 12:04 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2958
Views: 720793

Re: RELATIVITY QUESTIONS! (and other common queries)

I have a question about time, and why in particular physicists get so excited about it - what am I missing? I understand that the theory of relativity suggests that there is "spacetime" which is three dimentions of space and one of time and that time dilates as one travels faster. My issue...
by khakipuce
Thu Apr 08, 2010 11:51 am UTC
Forum: Science
Topic: Why is water used in nuclear reactors?
Replies: 29
Views: 3605

Re: Why is water used in nuclear reactors?

In the UK, the majority of reactors running at the moment are known as Advanced Gas Cooled Reactors (AGR) and use Carbon Dioxide (CO2) as the reactor coolant. The world's first commercial generating nuclear reactor was at Windscale and it was an air-cooled graphite pile. Graphite is carbon and air c...

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