So my question comes up as edited... I looked at the changes from the "original" and found it was NOT what I wrote... In particular there were serious errors of repeated words that were not present in the original. But the editor- http://physics.stackexchange.com/users/36804/nick-stauner - change...
@ThePhoton Yes. And he's posted the same content 5 times which crosses the line from posting a crackpot theory to co-opting the site into his personal crackpot soapbox.
@ThePhoton Yes well that's one of the issues with dimensional analysis as your only tool. It's too easy to introduce arbitrary terms but cancel units and then try to gain insight from those arbitrarily introduced terms.
If it weren't totally crackpot, I'd respond with something like: "It seems your analysis implies charge changes with time and has been since the beginning of the Universe. Does this imply any sort of experiment or observation we could do to see if charge really has been changing?"
IIRC the fine structure constant $\alpha$ (besides being dimensionless!) has been measured at great distances (back in time) and it hasn't changed.
Also, IIRC, it changes with energy level (but I don't understand why).
@BrandonEnright All I remember about the fine structure constant is that it was the reason for Quantum Mechanics to have course number 137 at my school.
@jackopen My eye-brain-linguistic system has a pretty absurdly mistake-blind autocorrect system. I read "start" as "star" until you pointed out the mistake :-p
@jackopen I've seen analysis of the maximum power output humans can generate for short periods of time. It should be possible to roughly translate that to a torque.
@jackopen PGP keys and SSH keys are used for cryptographic communication. I'm an information security engineer so most of the people I correspond with are also in the security field.
Also, "Elite track sprint cyclists are able to attain an instantaneous maximum output of around 2,000 watts, or in excess of 25 watts/kg; elite road cyclists may produce 1,600 to 1,700 watts as an instantaneous maximum in their burst to the finish line at the end of a five-hour-long road race." from en.wikipedia.org/wiki/Human-powered_transport
actually this value i wanted to refer with handwhell (used for valves)
if you know
user54412
4:57 AM
@BrandonEnright we see spectra from a long time ago, and seeing different transitions can get you alpha
user54412
this makes the observation easy in the sense that if you believe alpha varies linearly with time, then redshift z=6 gets you all the way back to a 1 Gyr old universe
@jackopen The SSH key can act like a special password. Why it's superior to a password in some situations is rather complicated to explain. The PGP key acts more like a special mailbox only I can open and a special pen only I can use to sign items.
user54412
(that is, even though redshift 6 sounds small compared to CMB at 1100 or matter-radiation equality at 3000, it's pretty far back)
user54412
on the other hand, the measurement has its subtleties
user54412
just one line doesn't tell you anything for instance, since changes in alpha are degenerate with redshift
user54412
5:00 AM
as a result, there's still one or two groups out there trying to show that alpha has changed over time
@jackopen Yes because it's a special type of encryption system called asymmetric encryption. The best analogy I can think of is that it allows me to give you a chest with a lock that is open that only I have the key to. You can put something in that chest and close the lock and give the chest to me. Only I can open the lock.
@jackopen If you're interested in learning about this sort of thing, I think reading about it would actually help more than generating the keys. Generating the keys just involves pressing some buttons and gives you basically the same thing you already see on my website.
i also want to undersand few concepts about OSI layers if you are networking guy i tried to read many times those 7 layers
but i cnat understand any other layer except physical layer#1 as it is visible
like cables
rs232
485 etc..
user54412
@jackopen If you want to experiment, I'm sure there are introductions out there (though I don't know any off the top of my head) that work through examples with small numbers, so you can see how encryption protocols work
user54412
you wouldn't want to see the full details of a secure ssh implementation, but you can get the overall idea with a little modular arithmetic
@jackopen I am a "networking guy" in that I work for a networking company and I know a lot about networking. Unfortunately I'm quite busy at this moment. I wouldn't mind discussing networking concepts and the OSI model with you at a later time though.
In the mean time, I'm sure there must be another Stack Exchange site chat room with lots of networking folks in it.
@ChrisWhite RSA and Duffie-Hellman can actually be done by hand for small values and it's rather fun to do.
So is generating small RSA keys and factoring them and breaking the encryption.
Modern computers can factor 64 bit numbers almost instantly which allows you to make a system essentially unbreakable by hand but trivial for a computer.
I guess information can be stored either in form of document, media(audio,video etc..), graphical(charts,images etc..) ways. Let us say there is a document which is having different information together (Important & garbage), Putting simply If a 50 page PDF document has mixed information (Important
@jackopen It's very hard to understand what you're asking. I don't think it's a matter of poor English but of the idea / question you're trying to articulate.
If you break the problem down into a more basic form where you have an ordered list without index numbers (like a linked list) and you want to delete some set of elements from the list and all you know is their position from the start, then deleting back to front is the best strategy
Is there something more you're looking for in an answer than that?
Well I seriously doubt there is a real-world solution that does what you're looking to do and I don't think there is any Stack Exchange site that could really help you.
if it would be excel that some formulae may work; but it is not excel files
@BrandonEnright another query: visualizations like mind mapping & infographic i know & these are very good tool/keywords to represent chunk of information; do you know other such things?
@jackopen Yes I'm familiar with both. I think "infographics" have the potential to convey information effectively but in my experience they are often constructed to convey a particular bias or push and agenda.
But in my experience, the mindmap didn't help and actually was a poor way to categorize information.
Don't take my dislike of mindmaps too seriously though. In my hands, a pencil / pen / marker is a terrible way to store / organize / convey information. That doesn't mean they aren't great tools. You just have to know how to use the tool.
I've built a mindmap of the electrostatics for my college physics 2 class (ad a simplified version of the same thing for use as a problem solving aid. The students tell me they like them and they help.
The thing is that it took me hours of tinkering to get the right set of ideas grouped and interlocked the right way.
Useful tool for displaying a complex of interrelated ideas so that a beginner can see how the link up, but the person drawing the map has to have mastered the topic, so not such a good way of handling brain-storming.
A classmate of mine spent a week learning how to use one of those programs. When he mentioned this to our advisor, he was handed a pen & paper with the question, "What's wrong with these?"
I posted this question:
Object at incline and Forces acting on it
I think I showed enough effort, I am not asking someone to do my homework, I am not asking someone to check my answers, and I am not being unclear on what I am having problems with.
The main idea of my question is I have a book w...
I am a first-year graduate student (electrical eng.); wavelets is one of the courses that I am taking presently. As part of the course, I plan to explore application of wavelets in computational electromagnetics (CEM). The idea behind it is to study a few applications where wavelets are used in C...
@EmilioPisanty Not anymore but I know I've plotted that curve before. It looks like a pretty standard simple parametric curve. About 15 years ago I could have told you right away which one would produce that curve.
I posted this question:
Object at incline and Forces acting on it
I think I showed enough effort, I am not asking someone to do my homework, I am not asking someone to check my answers, and I am not being unclear on what I am having problems with.
The main idea of my question is I have a book w...
