Minimum Uncertainity of Gaussian Wavepacket?

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Double slit experiment with Entangled Photons

Let us suppose that we have a source that produces a pair of entangled photons in one time instant. One of the photons is sent to apparatus-A and the other to apparatus-B. Apparatus-A and B are...

31 December 2013 3,481 7 View

Could anyone suggest some references that discuss Kraus operators for entanglement degradation of maximally entangled systems?

Kraus Operators for Entanglement Degradation.

31 December 2013 9,626 1 View

Colour Change of Paper

A paper which is initially white turns brown gradually. Why does this happen? Which chemical reactions cause this change?

02 March 2013 2,527 5 View

How does evolution take place at the genetic level?

Environmental factors influence the evolution of a species. For instance, take the case of bacteria. Some strains of bacteria develop drug resistance when exposed to the drug inside the body....

02 March 2013 5,216 9 View

Why only proteins are catalysts and harmones?

Among all the biological molecules, only proteins serve as catalysts in cellular reactions and hormones. Why is it that other class of molecules, say lipids, cannot act as catalysts or hormones?

02 March 2013 2,229 7 View

Why are protons and electrons exceptionally stable?

We know that almost all elementary particles decay in a short span of time. So far, no has ever observed a proton decaying into a more stable particle. What gives protons and electrons this...

02 March 2013 8,914 6 View

How are thoughts generated in the brain?

What is the mechanism of thought generation in the brain?

02 March 2013 9,408 16 View

How to evaluate the integral 1/(a1x^n + a2x^(n-1) + ... + a(n-1)*x + an)?

When n = 2 or 3, we can solve this integral by reducing the denominator to the form (x + a)^2 + B. What is the general procedure for evaluating such integrals for n > 3?

02 March 2013 293 9 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

What is the characteristic length to determine the Reynolds number for the scattered turbulent fluid flow?

Dear all, I just saw this example in FB on the difference between laminar flow and turbulent flow. The flow from a pipe hits the sink and scattered. The flow from the pipe is characterized as...

02 March 2021 1,999 5 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View

What is the density for pva electrospining?

I'm Juan Carlos, a high school student who is working with electropinning, I made an electropinning machine with a 21g needle and a 30kv high voltage source and the distance between my needle is...

28 February 2021 298 3 View

Is there a deep reason for using the squared modulus of the wave function as the probability density of the existence of the particle?

I think we were all surprised at the first time we got to know quantum mechanics that the squared modulus of the wave function is the probability density of the existence of the particle? The role...

28 February 2021 6,282 9 View

Should we reduce the standard unit of length to 0.31951540592 meter ?

The reasoning behind this question is to align the ratios of the proton potential in energy per charge to the speed of light in distance per time. As these two dimensions appear to be related,...

27 February 2021 947 7 View

How do you mesh a thin solid in Fluent?

Hello, I have used the shell function on SpaceClaim to create thin solids for the model I am studying. These are contained within an enclosure for my study. I chose this approach as it avoids the...

24 February 2021 8,856 3 View

No streamlines present in a small region inside a flow. This means exactly what?

No streamlines present means whether the flow is getting obstructed there and the velocity inside the region is zero? Or else, the fluid is trapped inside that region with a nonzero velocity?...

22 February 2021 5,249 10 View

Caleb Howington

The Gaussian distribution is the only mathematical function that has the same form in x-space and k-space. That should point you in the right direction. I recommend http://farside.ph.utexas.edu/teaching/qmech/lectures/node24.html if you want more information.

Robert Helling

You can derive this: In the derivation of the uncertainty relation you use two inequalities: Cauchy Schwarz and Im(z)