Question

Asked 29 April 2017

University of Al-Qadisiyah

What can physics teachers do to rise the chance that become math or physics geniuses?

the chance that become math or physics geniuses

Physics

Adil IDAN Abed

University of Al-Qadisiyah

thank you Hiba Riyadh

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Osamah Nawfal Oudah

University of Al-Qadisiyah

Dear Adel my opinion is allowing your students to be free to discover and pursue their strengths. You can do a lot to stop it for fear of math, a very common problem nowadays, and the type of education being very bottomless.

thank you....

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Adil IDAN Abed

University of Al-Qadisiyah

thank you dear osamah

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Hiba Riyadh Al-abodi

University of Al-Qadisiyah

Mathematics isn't something about IQs. It's very much the same as with everything else: practice, patience and diligence. You aren't supposed to be a genius. Curiosity is much more important, and the other attributes I mentioned. Of course not every runner can be a Usain Bolt, every physicist an Albert Einstein or every mathematician a Leonard Euler. However, there is one important lesson to learn: Do not believe something, just because anyone has said so! The other way around makes you a good scientist: Wrong, until proven! In mathematics, you learn to read those proofs which are to convince you. In physics you do experiments. What makes you think what you've read is right? It is not. And this has to become your standard assumption: it is wrong unless proven to you.

Reference https://www.physicsforums.com/threads/become-a-good-mathematician-without-the-threshold-iq.899337/

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1 Recommendation

Adil IDAN Abed

University of Al-Qadisiyah

thank you Hiba Riyadh

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Difference between TRNG or PRNG?

Discussion

13 replies

Asked 3 March 2019

Korakot Boonyaphon

Hello all,

I have been wondering about differences between true random number generator and pseudo-random number generator.

In my system there are three main components; clock signal ,push button, and output (LED). When the button is pressed, the LED simultaneously represents the state of the clock signal and remains the last state while the button is released. For instance, I release my finger when the LED is 'ON' so, it is on until the next pushing and vice versa. let's say the period of the clock is relatively fast so human is not able to know whether the current state is 0 or 1.

However, I got be confused that is my system a TRNG or PRNG. First, i thought it is a TRNG because the randomness is only determined by human decision. Therefore in this case I may say the source of randomness is non-deterministic However, the second thought can be raised that what if the clock can also be considered as a source then the randomness is likely not random ( non-deterministic) anymore

Notably, the real system is much more complicated, for an ease of discussion i just briefly explain the principle of the system.

what do you think about this?

Thank you in advance

Korakot

What is the difference between ultrasound or ultrasonic wave propagation in elastic and viscoelastic materials (concrete VS bituminous mixtures) ?

Question

3 answers

Asked 2 March 2019

Mohammed Boucherba

Good Morning,

I am looking in NDT test such as ultrasound in bituminous mixtures, which is a special materials with viscoelastic behavior, this viscosity provide a delay between force applied and deformation response. creating a complex behavior expressed in complex modulus

Most ultrasound test in elastic construction materials such as concrete which make the Wave Propagation (W.P) less complex and more simple. some research propose a different formula for P and S wave propagation in bituminous materials

So i am looking for physicist who can explain me the different between W.P in both materials (concrete VS bituminous mixture)

What is the speed of a photon, as observed by another photon?

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62 answers

Asked 2 April 2012

Anshul Avasthi

Is it 0 or c?

Is the equation for centrifugal force the same for liquids and solid bodies?

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2 answers

Asked 21 June 2012

Deleted profile

I am working on a project with diametral divided barrel and by the experimental results I get different results for liquids than solid bodies

Discontinuity of type-II superconductor magnetic hysteresis loop

Question

4 answers

Asked 27 August 2012

Marek Wojciech Gutowski

Not very often we can see magnetic hysteresis loops of type-II superconductors in their entirety. The published figures mostly present only their upper and lower branch, but their "ends" are usually outside the figure. Yet, in situation when the exciting field amplitude falls between Hc1 and Hc2, the discontinuity (jump) is observed in sample magnetization, even its sign is changed. Anything like this never happens in ordinary magnetic materials: here the two branches are always coinciding at the return point, i.e. at the maximum of the external field. What could be the possible reason for such an amazing behavior?

What is the difference between Room temperature PL and Low temperature PL?

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18 answers

Asked 5 December 2012

Murugesan SILAMBARASAN

Which one is best for luminescence studies of Nanostructures?

Can you solve the necktie paradox?

Question

26 answers

Asked 13 June 2013

Derek Abbott

Alice & Bob enter a game where each have a necktie and they call an independent judge to decide who has the better looking necktie.

The judge takes the better necktie and awards it to the other player. Alice reasons that entering the game is advantageous: although there is a possible maximal loss of one necktie, the potential winning state is two neckties with one that is judged superior. However, the apparent paradox is that Bob can follow the same reasoning, therefore how can the game be simultaneously advantageous to both players?

How can we resolve this dilemma? What are the implications and applications?

[Historical note: I did not invent this question. It was first stated in 1930 by the Belgian mathematician Maurice Kraitchik.]

Do you think that scientific research is more or less efficient now than in 1900's?

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18 answers

Asked 13 January 2014

Deleted profile

In the first half of 1900's (1900-1950) most of modern physics theories and discoveries were achieved (quantum physics, atomic physics, nuclear physics, high energy physics, astrophysics, solid state physics, solid state electronics, microelectroics, integration...) with much less means, equipments and funding than now.

In the second half of 1900's (1950-2000), most of the discoveries were more or less an improvement or a limited innovation with respect to what was already found before 1950. At the same time the funding being put in research are increasing drastically.

Do you agree that there is a decreasing efficiency of scientific research worldwide which started at the end of the 1900's and is more evident in 2000' years?

Can anyone answer my question regarding getting radial distribution function (RDF) from reaxFF water?

Question

4 answers

Asked 27 March 2014

Anupam Neogi

I'm simulating liquid water by reaxFF based MD. The initial atomic configuration of my amorphous water (i.e. bulk liquid) was generated by using random sampling, employing pcff+ force-field. Then that bulk like amorphous water sample was time integrated using NPT ensemble for ~ 2 ns at ambient conditions with reaxFF and the dynamic charge equilibration algorithm. My system contains 750 water molecules. The time averaged (over 50 ps) TD parameters T and P indicate that the sample is equilibrated enough.

But the pair-correlation function/RDF of O-O, O-H and H-H (averaged over 50 ps with # of bins=500) shows that there is some mismatch of peak height and position of peaks from the previously reported MD/ReaxFF curve. Although different *ice* phase RDFs of MD/ReaxFF show closer match with the past reported MD/TIP5P and experimental values.

Is it necessarily true that for the *liquid* state of water the RDFs from two different initial configuration MD simulations with same force field should be the same?

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