31 Questions 430 Answers 0 Followers
Questions related from Parviz Parvin
The impact of Thomas Edison and Nichol Tesla' s innovations is inevitable on the daily life of the mankind. I am astonished why they are not among the Nobel laurates in early decades of twenty...
06 June 2016 1,271 1 View
There are two major techniques to measure ps - fs pulses of the mode-locked lasers: I) Steak camera II) Optical autocorrelation According to the space-time transformation in second-order...
01 January 2016 6,571 3 View
If you immerse RGB (red-green-blue) light sources in the pool of water, then will the colors of light change? The detector senses the photon energy, whereas we uderstood from the basic laws of...
11 November 2015 5,181 6 View
Presently, the mankind dreams to find efficient technique to improve the storage capacity of batteries for the purpose of ever developing electrical vehicles. It arises from the fact that 50 kg...
09 September 2015 5,174 8 View
Hubble constant (expansion rate of the universe) is still controversial. It is known as a key parameter to explain Big Bang theory, the expansion of the universe and relative motion of the...
08 August 2015 5,189 4 View
The pure Gaussian beam (M2~1) follows the diffraction limited divergence.The deviation from the Gaussian beam deteriorates beam profile quality and beam divergence. I believe that there is no...
05 May 2015 9,654 4 View
Similar to optical convex and concave lenses, are there any gravitational convergent and divergent lenses in nature? This idea may help to investigate the alternative propulsion for...
03 March 2015 5,046 4 View
Laser with stable resonator creates the axial and traverse modes. The mode frequency is a function of mirror radii and the resonator length as well as the effect of transverse modes. What about...
03 March 2015 9,306 4 View
The interaction of photons with matter such as Compton and Thompson scattering are well-known at higher photon energies. What about the scattering events between photons? Those likely occur at...
01 January 2015 3,763 30 View
To my knowledge, there is no solid correlation between temporal or spatial coherence and the polarization of light (linear, circular or elliptical) because the coherence arises from the nature of...
01 January 2015 9,421 15 View
The 2014 Nobel prize in Physics has been awarded to Isamu Akasaki, Hiroshi Amano and Shuji Nakamura, for their invention of efficient blue light-emitting diodes which has enabled bright and...
10 October 2014 5,975 3 View
NASA abandoned the space program on moon in our neighborhood since 1975 whereas Mars exploration currently goes on around 100 million kilometers afar.The extensive efforts are being done using...
08 August 2014 7,964 12 View
The nuclear energy was discovered more than 70 years ago based on famous Einstein relation, E=mc2 . This came true with the contribution of many scientists and engineers eventually to realize the...
07 July 2014 1,665 7 View
Eddison definition: Genius is 2% inspiration and 98% perspiration. Do you believe that most of mankind achievements are carried out by genius people?
06 June 2014 9,920 8 View
Longevity secrets. According to a famous ancient tale, a drink (or substance) that assures the eternal- everlasting life for the owner, is called elixir! Why is not the normal life identical in...
04 April 2014 9,910 27 View
To my knowledge, ever increasing global demand for energy finally will turn out as a global dilemma. The best method for energy distribution are based on multi- disciplinary energy saving...
04 April 2014 6,200 14 View
The river flows from outskirt of the mountain downward following a very crooked path. The lava from the volcanic activities chooses a similar route. Similarly, a glacier pathway incudes a number...
03 March 2014 8,164 14 View
Being transparent or creating an illusion? I may propose a device to transfer the images from one location to display at another location using the optical fibers. Furthermore, invisibility may be...
02 February 2014 6,362 100 View
Soft x-ray laser radiation with tens of eV photon energy and hard x-ray lasers with KeV photon energy may be generated based on free electron laser ( FEL) concept. To my knowledge, the invention...
02 February 2014 7,967 12 View
The planar phase front and the spherical phase front may change the focal point of an ideal micro-lens ( having min aberration). This fact may be enhanced drastically for an incident distorted...
02 February 2014 4,882 47 View
This is a question that I have always asked myself throughout my life. I assure that it is your question too. Setting aside the corresponding interpretations by various religions, how do you find...
01 January 2014 9,803 27 View
Newton time is absolute based on Galilian trasforms. Einstein considers realtive time according to Lorentzian transforms. Time dilation occurs in relativistic velocities and seems to be a correct...
12 December 2013 1,359 25 View
No gravitational wave was measured yet, no graviton was detected accordingly. On the other hand no space- time curvature was observable. There is no successful experiment to validate the...
12 December 2013 7,528 92 View
Graphene is a nano structure. It is a 2-D carbon sheet with a honeycomb structure that exhibits extraordinary physical and electrical properties. One outstanding electrical property of graphene is...
12 December 2013 1,686 6 View
If we accept Big-Bang theory, what has been before that? No space, no time, no mass, no energy, no momentum, no event, no sequence...??!!
12 December 2013 9,006 79 View
Cancer consists of a series of diseases based on undesired cell proliferation. The cancerous cells are continuously formed in infectious organs whereas the human immunity system regularly...
11 November 2013 598 88 View
Does it mean that light is particle? To my knowledge , the light detectors within any spectral range detects light based on photon property of light. The array detector function is also based on...
11 November 2013 5,679 34 View
Dispersive materials somewhat slow down the light. Regarding the group velocity dispersion, the group velocity is smaller than phase velocity. The group velocity resembles to be much smaller in...
11 November 2013 6,652 29 View
Despite the set of rate equations formulate the instantaneous population of the upper and lower levels, the population inversion of laser transition, gain and saturation properties, however those...
11 November 2013 6,209 6 View
Rayleigh scattering explains the elastic scattering of light during the interaction with gases which is proportinal to the inverse quartet of the incident wavelength.
10 October 2013 985 57 View
-
11 November 2012 2,918 10 View
