# Search results

1. ### Software to draw simple models

Hi there, I am wondering if you have any suggestions how to draw these simple engineering models? Thank you in advance.
2. ### Analysis Reference book for "Fredholm integral equations"

Hi, I am looking for a good reference book for "Fredholm integral equations". + a book with lots of examples related to this topic! Thanks for your help.
3. ### Tunneling in a non-subatomic particles

Hi, We now electrons do tunnel and for example FE happens because of this. However, is it true to scale up this effect for non-subatomic particles? For example, is it OK to say, if you are behind a wall and hit yourself to the wall, there is a chance that you might Tunnel and see yourself on...
4. ### Multimeter current level when measuring resistance

Hi, When using a multimeter to measure resistance, what is the used current level of the multimeter? I am using Fluke 77 IV Series Digital Multimeter. Thanks.
5. ### INTEGRAL{ e^cos(x) dx }

Homework Statement I want to solve this integral without using series expansion. The answer should be in a closed form. I wonder if this is possible? Homework Equations The Attempt at a Solution I used numerical methods and was able to solve it numerically for a given...
6. ### Waves produce oxygen?

Hi, Does wave hit the shore produce oxygen? If so, how and how significant is this amount of oxygen? Thanks!
7. ### Effect of dissociation energy on plasma ions behavior

Hi, Suppose there are two plasma cases, conditions are the same, except for the gases present: a-Oxygen b-Nitrogen Since the dissociation energy of nitrogen is higher than oxygen, what could be concluded from it? Could it be more energetic nitrogen ions than oxygen ions (because initially...
8. ### Does melting deteriorate the crystalline order?

I wonder if melting deteriorate the crystalline properties and order of a solid? For example, one should expect to get 2 different Raman spectra from the solid and melted samples?
9. ### Impedance matching vs max power transfer criterion

Hello, I wonder if there's any difference between the "impedance matching" and "maximum power transfer" criterion? I assume in both cases, one impedance should be designed to be the complex conjugate of the other. Thanks.
10. ### Power of laser vs Power of X-ray

Hi, I wonder how to compare the power of a laser and an X-ray. For example 1mW power of a laser hitting an object is comparable to the an X-ray generating 1mW of power? Thank you.
11. ### What is a water bubble?

This seems to be a very simple (stupid) question: If an inert gas is purged inside a distilled water container, bubbles are formed on the surface. The question is what are the constituents of those bubbles? and those constituents seems to be formed during a physical process, not a chemical...
12. ### Plot some 2d graphs in a 3d fashion

Hi, How can I plot some 2d graphs in a 3d fashion like the following picture using excel or matlab? Any idea is appreciated.
13. ### Connect an antenna directly to oscilloscope

Hi, Is it possible to direct connect an antenna working below 100MHz to an oscilloscope with coaxial cable and see the radiated signals? Thanks.
14. ### MATLAB How to export Matlab curve-fitted data to excel?

Hi all, I have used matlab curve fit tool to curve-fit a set of x-y points. Now I want to export the curve-fitted y point to excel. Any idea how to do this? Thank you very much.
15. ### C+N2 (@ hight T)-> ?

C+N2 (@ hight T)--> ? Hi all, I wonder if carbon (from graphene sheets) and nitrogen gas (from a compressed cylinder) can react at high temperatures? Thank you very much.
16. ### How to measure the temperature of an arc discharge

Hi all, I was thinking about measuring the temperature of an arc discharge. The size of the discharge is very small, in the order of micrometer. So it is not possible to put a thermocouple near the it. Thank you very much.
17. ### Cohesion between two Au layers

I have deposited about 200nm of Au and I am going to deposit another 200nm layer of Au on top of this layer. All deposition are with e-beam evaporation and are done in vacuum. I have two questions: 1- Do you know how the cohesion between these two layers is? 2- I am going to deposit the...
18. ### Electroplate Cu on gold

Hi all: I have a 200nm Au seed layer. and I am electroplating Cu on that using a solution. but the result is not good. The adhesion between the electroplated copper and gold seed layer is very poor and it easily peels off. 1-I wonder how can I increase the adhesion between them? 2-Does...

Dear all: I wonder how the adhesion between Al and Au is. I am going to deposit Au on top of Al layer. Regards.
20. ### How to measure O2 in a chamber?

Dear all: I want to make a chamber as O2-free. The chamber is not perfectly sealed, so it has some small holes. I have used N2 gas (by pumping N2 from one input and escaping of O2 from holes in junctions). Now, I want to measure the amount of remaining O2 inside chamber. How can I do that? Is...
21. ### Etchant that attacks Fe and not attack Al

Dear all: I have two layers: 1-2nm of Fe on top of 10-30 nm of Al. I am going to etch some portions of the top Fe layer. So I am looking for an etchant that attacks Fe and not Al. Can you help me? Regards.
22. ### Cantilever switch based on electrostatic force

Dear all: I am going to design a cantilever switch which is working with electrostatic (capacitive) force. I want to design that. That is to find the dimension and material of that. I was wondering if you could kindly suggest a reference for designing this. Thank you very much.
23. ### How to distinguish Isopropanol?

Hello: I have a liquid in a bottle. I want to know whether it is Isopropanol or not. I want to distinguish it among Methanol, Acetone and Ethelin. Can you help? Thanks.
24. ### Medical Is microwave cooking safe?

Hi everyone: Have you ever heard anything about the effects of the microwave on body? ..