# Recent content by mattkunq

1. ### Coefficient of Variance(clarification)

Ok i dun just take the the stdev and cov, I fourier transform it and do it a bandpass filter for the different sizes of mottle. then i reverse transform it and i calculate the cov of the filtered image. With only blobs or certain sizes and no gradients or minimal
2. ### Coefficient of Variance(clarification)

how come not? =S
3. ### Coefficient of Variance(clarification)

What I am looking for is the comparison in Mottle in the pictures. How the grey level varies in the picture from one to another. And being able to say which one will be better to the human eye.
4. ### Coefficient of Variance(clarification)

Ok, So now heres what I am actually wondering about this for. So Im doing a project on the variation of a black and white picture and I quantify that by calculating the COV% for the grey level. I noticed that when the sample is darker the COV% tends to be a larger number than a whiter image...
5. ### Coefficient of Variance(clarification)

If I added 1 a constant number same for every side to every side of the dies then ya i would think so.
6. ### I want to do energy storage What's the battery industry like? Other alternatives?

Re: I want to do energy storage...What's the battery industry like? Other alternative Well if you stack a couple thousand of those together things will happen lol. Which is not phone are gunna be using or cars. But in what is suppose to be very safe rooms. And the hydrogen gas exploded which...
7. ### Coefficient of Variance(clarification)

Can someone please help me with this. I read on wikipedia that the coefficient of Variance can be used when the measurements are of ratio scales but cannot be used on interval scales. I know it is useful to use it to compare samples with completely units like the variance in your mass...
8. ### I want to do energy storage What's the battery industry like? Other alternatives?

Re: I want to do energy storage...What's the battery industry like? Other alternative Well that would be the voltage that determines the safety. A higher voltage will be able to provide a stronger current with the same resistance so u might be able to feel something/die if u touch both ends of...
9. ### A deeper understanding of the octet rule.

Hello, I think electronegativity, molecule structure and a whole bunch of things add up to the energy before and after. Just taking the orbital in account is not enough to conclude that it will bond or not bond. The reaction will happen if the gibbs free energy drops. Your argument is that for...
10. ### I want to do energy storage What's the battery industry like? Other alternatives?

Re: I want to do energy storage...What's the battery industry like? Other alternative Hello, I see battery life improving by at least 4 times in the near future. Si anode with i think the highest if not one of the highest energy density. like one SI can bond to lots of Li. Si can bond to...
11. ### Latent Heat (enthalpy) of Fusion changes with Pressure?

Hello Sir, Latent heat of anything can simply be calculated by taking the difference between enthalpy after and before. I dont' remember but the dependence of the enthalpy before and after will tell you if it will change the latent heat.
12. ### I want to do energy storage What's the battery industry like? Other alternatives?

Re: I want to do energy storage...What's the battery industry like? Other alternative Hello Sir, I am a Chemical Engineering student and I have worked in a Li-ion battery research lab for one of my work terms. In my mind it seems like theres a lot of competition in it. Lots of scientists...
13. ### Adding two set of samples with standard deviation confusions

Hello People, I have figured it out. When I say standard deviation I mean the follow equation is applied for the sample: [1/(n-1)]*[(sum of x^2)-n*samplemean^2)] So my confusion was the difference between combining two sample sets together and adding the two sample outputs respectively...
14. ### Adding two set of samples with standard deviation confusions

Hello People, I'm and just somewhat confused about this topic. Lets say I have a sample set A with sample size= 101 mean =10 and sample stdv of 1 then sample set B with sample size= 100 Mean=15 with sample stdv of 2. If i add these two samples sets together I should get a new stdv that...