Search results for query: *

• Users: garyd
• Order by date
1. Measurement uncertainty: Standard uncertainty of the mean

Sorry i was referring to my lecture notes, n makes a lot more sense, thanks
2. Measurement uncertainty: Standard uncertainty of the mean

Yes it should be ##\sigma_{n-1}/\sqrt N## But what value is N
3. Measurement uncertainty: Standard uncertainty of the mean

Homework Statement Hi, I am doing some basic X-ray analysis and trying to quantify the measurement uncertainty associated with my determined value for the K-α line of copper. I have obtained the x-ray spectrum from a copper target using a detector and multichannel analyzer (No. of pulses/pulse...
4. Energy Resolution of a solid state X-Ray detector

I have verified the results for five different samples and the numbers look good, So am I correct in thinking that at this energy my detector can not distinguish two peaks that are separated by 490 eV
5. Energy Resolution of a solid state X-Ray detector

Still working on this and now I'm wondering if my detector energy resolution is the fraction of full width half max of the centroid value? I should also state that I have obtained a counts Vs. energy spectrum of the characteristic x-rays from a copper sample. I have identified the K-α line and...
6. Energy Resolution of a solid state X-Ray detector

Homework Statement Hi all, I have been given the task of quantifying the energy resolution of a p-i-n semi-conductor x-ray detector and present it as a value in electron volts Homework Equations %Resolution=E FWHM / Ei Where E FWHM is the full width half maximum of a peak and Ei is the...
7. Reversible Clapeyron cycle efficiency

Homework Statement The Clapeyron cycle efficiency is similar to the Carnot cycle except that two adiabatic paths are replaced with isobaric processes a) based on the above information, draw a Clapeyron cycle. b)Derive the efficiency of the reversible Clapeyron cycle Homework...

9. The ideal gas law for an adiabatic process

Confidence, I am learning to trust the equations. Another part of the question is; by what factor has the pressure increased? Can I use P V^Ƴ=constant, with p1=1, multiplied by ratio of V1/V2, both to the power of Ƴ? ans=2.95
10. The ideal gas law for an adiabatic process

Homework Statement Hi can someone please have a look at this question and let me know if I am on the right track, thanks. A diesel engine requires no spark plug; instead the air in the cylinder is compresses so highly the fuel ignites spontaneously on injection to the cylinder. Q. If the air...
11. AFM imageing and convolution

Hi all I was wondering if someone could have a look at my answer attempts. I am having great trouble with Q.3 so any help would be greatly appreciated. Figures are attached Homework Statement Q1. Sketch expected image profile for rectangular protrusion from an otherwise locally flat...
12. Heat Capacity and specific heat

Thanks very much.
13. Heat Capacity and specific heat

Homework Statement I am confused about what the difference between specific heat and heat capacity is. I have a block of metal (Aluminium) which I had to record dimensions and calculate the heat capacity of the block. I am just wondering am I doing the correct calculation? Homework...
14. Controlling the power output of a power resistor

Yes I have been looking at the circuits on the datasheet of the AD595 and I think I can handle them ok.

Sorry
16. Controlling the power output of a power resistor

I have only started the thermocouple circuit, reason being that the power resistor circuit has to be submitted by tomorrow and I still have a couple of days for the thermocouple circuit. I plan on using a type K thermocouple with an AD595 thermocouple amp. The AD595 will give me 10mV/°C so...
17. Controlling the power output of a power resistor

I am aware of the DARLINGTON configuration. I will complete the circuit and post when I am finished. Thanks
18. Controlling the power output of a power resistor

Again I appreciate your help. Yes I think limiting the current bellow maximum to 1.0A is the right thing to do. This also helps to keep op amp from saturation due to the 12V maximum allowed. I am wondering if the base current, Ib is high enough to achieve my 1.0A current with my 2N3055...
19. Controlling the power output of a power resistor

Thanks for your reply. I have a ±12V supply. I don't fully understand your explanation, especially the polarity of the voltages as my knowledge is very limited. I have attached an attempt of a circuit that I have been working on. I am fairly sure it is incorrect but not sure why.
20. Controlling the power output of a power resistor

Homework Statement Hi, I am working on a temperature control system which involves using a power resistor to heat a block of aluminium and a thermocouple to measure the temperature. Both the thermocouple and the power resistor will be controlled using the NI USB-6008 and Labview. As my...
21. Determine the thickness of aluminium using γ-rays

Homework Statement [/b][/B] Hi all, I have been given a mini-project to complete which involves a block of aluminium which is stuck to a piece of wood and taped so that where the aluminium and wood touch is unknown. I have been told that I need to design an experiment to measure the thickness of...
22. Question on aperture and magnitude.

Thank you for your help, I have been finding this topic to be very counterintuitive (at least for me anyway). Ok, let's see if I have made any progress! Ratio of the square of aperture diameters= (70/7)^2= 100 So difference in magnitude=-2.5Log(base10)(100)=-5 Human eye can see magnitude 6...
23. Question on aperture and magnitude.

Homework Statement A telescope with aperture 10 times the human eye could see stars down to magnitude? Homework Equations I was not given an equation with the question but I have found the following but I do not know if it is correct. M=Log(2.51188)*(A2/A1)^2 The Attempt at a Solution A1=...