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2013-05-23
04:14
Lognormal Infection Times of Online Information Spread / Doerr, Christian ; Blenn, Norbert ; Van Mieghem, Piet
The infection times of individuals in online information spread such as the inter-arrival time of Twitter messages or the propagation time of news stories on a social media site can be explained through a convolution of lognormally distributed observation and reaction times of the individual participants. Experimental measurements support the lognormal shape of the individual contributing processes, and have resemblance to previously reported lognormal distributions of human behavior and contagious processes..
arXiv:1305.5235.- 2013 External link: Preprint

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2013-05-23
04:14
An investigation of Lorentz transformation / Shahandeh, Farid
A new method of derivation of Lorentz Transformation (LT) is given based on both axioms of special relativity (SR) and physical intuitions. The essence of the transformation is established and the crucial role played by the presumptions is presented for clarification. [...]
arXiv:1305.5212.- 2013 - Published in : Phys. Essays: 25 (2012) , pp. 144 External link: Preprint

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2013-05-23
04:14
The wave-function description of the electromagnetic field / Friedman, Yaakov
For an arbitrary electromagnetic field, we define a prepotential $S$, which is a complex-valued function of spacetime. The prepotential is a modification of the two scalar potential functions introduced by E. [...]
arXiv:1305.5210.- 2013 - Published in : Conf. Ser.: 437 (2013) , pp. 012018 External link: Preprint

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2013-05-23
04:14
Novel detector systems for the Positron Emission Tomography / Moskal, P ; Salabura, P ; Silarski, M ; Smyrski, J ; Zdebik, J ; Zieliński, M
In this contribution we describe a novel solution for the construction of Positron Emission Tomograph. We present the device allowing for determination of the impact position as well as time and deph of interaction of the annihilation gamma quanta. [...]
arXiv:1305.5187.- 2013 - Published in : No.: 2 (2011) , pp. 73 External link: Preprint

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2013-05-23
04:14
Momentum diffusion of atoms and nanoparticles in an optical trap formed by sequences of counter-propagating light pulses / Romanenko, V I ; Romanenko, A V ; Udovitskaya, Ye G ; Yatsenko, L P
The motion of atoms and nanoparticles in a trap formed by sequences of counter-propagating light pulses has been analyzed. The atomic state is described by a wave function constructed with the use of the Monte Carlo method, whereas the atomic motion is considered in the framework of classical mechanics. [...]
arXiv:1305.5033.- 2013 - Published in : Ukrainian Journal of Physics: 58 (2013) , pp. 438-449 External link: Preprint

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2013-05-23
04:14
Coexisting attractors and chaotic canard explosions in a slow-fast optomechanical system / Marino, Francesco ; Marin, Francesco
The multiple time scale dynamics induced by radiation pressure and photothermal effects in a high-finesse optomechanical resonator is experimentally studied. At difference with two-dimensional slow-fast systems, the transition from the quasiharmonic to the relaxational regime occurs via chaotic canard explosions, where large-amplitude relaxation spikes are separated by an irregular number of subthreshold oscillations. [...]
arXiv:1305.4929.- 2013 - 8 p. - Published in : Phys. Rev. E 87 (2013) 052906 External link: Preprint

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2013-05-23
04:14
Superradiant phase transitions with three-level systems / Baksic, Alexandre (MPQ) ; Nataf, Pierre (MPQ) ; Ciuti, Cristiano (MPQ)
We determine the phase diagram of $N$ identical three-level systems interacting with a single photonic mode in the thermodynamical limit ($N \to \infty$) by accounting for the so-called diamagnetic term and the inequalities imposed by the Thomas-Reich-Kuhn (TRK) oscillator strength sum rule. The key role of transitions between excited levels and the occurrence of first-order phase transitions is discussed. [...]
arXiv:1206.3213.- 2013 - Published in : Phys. Rev. A 87 (2013) 023813 External link: Preprint

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2013-05-23
04:14
Effects of symmetry breaking in finite quantum systems / Birman, J L ; Nazmitdinov, R G ; Yukalov, V I
The review considers the peculiarities of symmetry breaking and symmetry transformations and the related physical effects in finite quantum systems. Some types of symmetry in finite systems can be broken only asymptotically. [...]
arXiv:1305.5131.- 2013 - Published in : Phys. Rep. 526 (2013) 1-91 External link: Preprint

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2013-05-23
04:14
A normal-pressure MWPC for beam diagnostics at RIBLL2 / Tang, Shu-Wen ; Ma, Peng ; Duan, Li-Min ; Sun, Zhi-Yu ; Lu, Chen-Gui ; Yang, He-Run ; Hu, Rong-Jiang ; Huang, Wen-Xue ; Xu, Hu-Shan
A normal pressure MWPC for beam diagnostics at RIBLL2 has been developed, which has a sensitive area of 80 mm$\times$80 mm and consists of three-layer wire planes. The anode plane is designed with a wider frame to reduce the discharge and without using protection wires. [...]
arXiv:1305.5007.- 2013 - 4 p. - Published in : Chinese Physics C: 3 (2013) , pp. 6 External link: Preprint

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2013-05-23
04:13
Pseudo-rapidity Distributions of Charged Hadrons in pp and pA Collisions at the LHC / Hong-Min, Wang ; Jia-Fu, Liu ; Zhao-Yu, Hou ; Xian-Jing, Sun
In the framework of Color Glass Condensate, the pseudo-rapidity distributions of charged hadrons in pp and pA collisions at the LHC are studied with the UGD function from the GBW model. With a $\chi^{2}$ analysis of the CMS data in pp collisions at $\sqrt{s}=0.9,~2.36,~7$ TeV, the normalization factor is obtained and the theoretical results are in good agreement with the perimental data. [...]
arXiv:1305.5106.- 2013 - 9 p. - Published in : No. (2013) External link: Preprint

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