Recent content by johnintheuk

I'm looking for dyes that have exceptionally high quantum yields and minimal photobleaching rates. So far, perylene based dyes seems to be the best. Their yield approaches 100% and exhibits the low photobleach rates I mentioned. Quantum dots have reasonable yield and great photobleach...

Thanks slider, although the problem is more complex than just area. I need to reference this curve to another, and then use the second to find the percentage of the first that's being absorbed, and I need to do this along the entire length of the curves, for at least tens of points, preferably more.

I'm trying to find the quantity of energy transferred between two systems. I have an absorption curve and a drive curve, but neither of these follow a mathematical expression, they're random squiggely lines. I want to use the absorption curves to find out how much of the drive is being...

I'm trying to find the quantity of energy transferred between two systems. I have an absorption curve and a drive curve, but neither of these follow a mathematical expression. I want to use the absorption curves to find out how much of the drive is being transferred. I know one way to do this...

As open minded as I like to be, lasers are not going to offer any improvement in terms of someone walking round with one anytime soon. You can't simply point a laser at something and have it slice through it like it does in the films. The laser heats the object and a jet of gas blows the...

To an extent, the Earth pin is only slightly longer.

I'm looking at some labeled as spectrographs as well. Is there any terminology I can use to bias my searches towards the none chemistry version? I guess the majority of them use fibers to get the light back to the grating and diodes, so fiber spectrometer might be a good start.

It's a spectrograph but not used for chemical analysis in the lab, the receptor is loose and can be used for analyzing the spectral output of a source. It's not a photometer, that's either the receiver alone or tends to work at only one frequency. I've seen them labeled as spectrographs...

As russ say, you need both the live and neutral shut off. The mains is not ground isolated (floating). It's transmitted down the power lines with respect to the earth, which your house and everything in it is also connected to. So the voltage exists with respect to everything around you...

Both of the above I think the three pin shuttered design is remarkably good for it's simplicity.

It also reduces the chances of getting hot spots

the pigments in white coloured materials emit and reflect more spectrums of light back. Black pigments absorb it and convert it to conducted heat. if you wear black clothes, they need to be very loose fitting.

I dislike the uncertainty principle for explaining this on the grounds that it's discussing the idea of taking a measurement now and knowing a pair of canonically joined variables simultaneously. Thus creating a degree of randomness in one of those variables, as measurement of one relies on...

I'm not as well read on big bang theory as some of you, but I have spent a lot of time wondering about some of the comments used to describe it in the media or education. A lot of them describe it as being a single, immeasurably small, finite point and being composed of pure energy. String...