Energy conservation in high-pT nuclear reactions

2014 ◽  
Vol 23 (04) ◽  
pp. 1430006 ◽  
Author(s):  
B. Z. Kopeliovich ◽  
J. Nemchik ◽  
I. K. Potashnikova ◽  
Iván Schmidt
Keyword(s):  
Energy Dissipation ◽  
Energy Conservation ◽  
Energy Loss ◽  
Nuclear Reactions ◽  
Hadron Production ◽  
Energy Deficit ◽  
Gluon Radiation ◽  
Dominant Mechanism ◽  
Cronin Effect ◽  
Aa Collisions

The Cronin effect, which is nuclear enhancement of high-pT hadron production in pA collisions was successfully predicted prior the measurements at RHIC and LHC. The restrictions imposed by energy conservation lead to spectacular effects. Energy deficit becomes an issue for hadron production in pA collisions at large xL and/or large xT toward the kinematic bounds xL, T = 1. It leads to a suppression, which has been indeed observed for hadrons produced at forward rapidities and large pT. Intensive energy dissipation via gluon radiation by a highly virtual parton produced with large pT, makes this process impossible to continue long. Color neutralization and creation of a colorless dipole must occur promptly. When this happens inside a hot medium created in AA collisions, attenuation of dipoles, rather than induced energy loss, becomes a dominant mechanism for suppression of high-pT hadrons.

Energy dependence of hadron yields in pp and AA collisions

2015 ◽  
Vol 39 ◽  
pp. 1560109
Author(s):  
D. A. Artemenkov ◽  
G. I. Lykasov ◽  
A. I. Malakhov
Keyword(s):  
Energy Dependence ◽  
Hadron Production ◽  
Exponential Form ◽  
Suggested Approach ◽  
High Energies ◽  
Aa Collisions

To describe the data on hadron production at high energies in the midarapidity region and not large transverse momenta [Formula: see text], we modify the simple exponential form of the [Formula: see text]-spectrum. The hadron [Formula: see text]-spectrum is presented in two parts due to the contributions of quarks and gluons, each of them has different energy dependence. The suggested approach alows us to describe rather satisfactorily the inclusive spectra of hadrons produced in [Formula: see text] collisions at energies from the AGS up to LHC.

Design of the Low-Carbon and Ecological Kindergarten

2011 ◽  
Vol 99-100 ◽  
pp. 617-623
Author(s):  
Yan Li ◽  
Kai Xie
Keyword(s):  
Life Cycle ◽  
Energy Dissipation ◽  
Energy Conservation ◽  
Emission Reduction ◽  
Low Carbon ◽  
The Public ◽  
Conservation Technology ◽  
Geographical Position ◽  
Whole Life Cycle ◽  
Reasonable Energy

The public in China have a vague notion of architecture energy conservation, additionally the various and complex geographical position and climate, so the problem of architectural energy dissipation has deteriorated. In terms of architectural energy conservation, this design wholly considered energy conservation and emission reduction in the whole life cycle. The theory of “nonexistence-existence-nonexistence” should be carried out practically and low-carbon, ecological kindergarten will be founded in Huainan by studying and taking advantage all kinds of reasonable energy conservation technology. We should exert a subtle influence on cultivating children’s sense of energy conservation and emission reduction in order to make it be popular in the society which treats children as center.

scholarly journals Energetics of Hi-C EUV brightenings

2018 ◽  
Vol 615 ◽  
pp. A47 ◽  
Author(s):  
Srividya Subramanian ◽  
Vinay L. Kashyap ◽  
Durgesh Tripathi ◽  
Maria S. Madjarska ◽  
John G. Doyle
Keyword(s):  
High Resolution ◽  
Energy Loss ◽  
Extreme Ultraviolet ◽  
Thermal Structure ◽  
Emission Measure ◽  
Light Curves ◽  
Solar Dynamics Observatory ◽  
Differential Emission Measure ◽  
Dominant Mechanism ◽  
Solar Dynamics

We study the thermal structure and energetics of the point-like extreme ultraviolet (EUV) brightenings within a system of fan loops observed in the active region AR 11520. These brightenings were simultaneously observed on 2012 July 11 by the High-resolution Coronal (Hi-C) imager and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO). We identified 27 brightenings by automatically determining intensity enhancements in both Hi-C and AIA 193 Å light curves. The energetics of these brightenings were studied using the Differential Emission Measure (DEM) diagnostics. The DEM weighted temperatures of these transients are in the range log T(K) = 6.2−6.6 with radiative energies ≈1024−25 ergs and densities approximately equal to a few times 109 cm−3. To the best of our knowledge, these are the smallest brightenings in EUV ever detected. We used these results to determine the mechanism of energy loss in these brightenings. Our analysis reveals that the dominant mechanism of energy loss for all the identified brightenings is conduction rather than radiation.

scholarly journals Self-similarity of hadron production in pp and AA collisions at high energies

2015 ◽  
Vol 30 (21) ◽  
pp. 1550127 ◽  
Author(s):  
D. A. Artemenkov ◽  
G. I. Lykasov ◽  
A. I. Malakhov
Keyword(s):  
Hadron Production ◽  
The Self ◽  
Pp Collisions ◽  
Self Similarity ◽  
High Energies ◽  
Wide Range ◽  
Aa Collisions

We analyze the self-similarity approach applied to study the hadron production in pp and AA collisions. This approach allows us to describe rather well the ratio of the proton to antiproton yields in AA collisions as a function of the energy at a wide range from a few GeV to a few TeV. We suggest a modification of this approach to describe rather well the inclusive spectra of hadrons produced in pp collisions at different initial energies from the AGS to LHC.

scholarly journals On the Origin of Frictional Energy Dissipation

2019 ◽  
Vol 68 (1) ◽  
Author(s):  
Renfeng Hu ◽  
Sergey Yu. Krylov ◽  
Joost W. M. Frenken
Keyword(s):  
Energy Dissipation ◽  
Energy Loss ◽  
Lattice Vibrations ◽  
Scientific Problem ◽  
Frictional Energy ◽  
Slip Event ◽  
Induced Motion ◽  
Frictional Energy Dissipation ◽  
As If

Abstract The origin of the friction between sliding bodies establishes an outstanding scientific problem. In this article, we demonstrate that the energy loss in each microscopic slip event between the bodies readily follows from the dephasing of phonons that are generated in the slip process. The dephasing mechanism directly links the typical timescales of the lattice vibrations with those of the experienced energy ‘dissipation’ and manifests itself as if the slip-induced motion were close to critically damped. Graphical abstract

Additional Energy Dissipation of Vehicles on a Gradient Road

2013 ◽  
Vol 361-363 ◽  
pp. 2304-2307
Author(s):  
Rui Ling Yu
Keyword(s):  
Numerical Simulation ◽  
Energy Consumption ◽  
Energy Dissipation ◽  
Energy Loss ◽  
Additional Energy ◽  
Energy Consumption Model ◽  
Consumption Model

The additional energy consumption model of vehicles on a gradient road is introduced in this paper. The numerical simulation of the model shows that the additional energy consumption varies with the different slope. Larger solpe means less additional energy loss on a uphhill road while it is the contrary tendency on the downhill road. The analysis of the simulation result is consistent with the actual.

Nutation Accretion or Decay Due to Internal Energy Dissipation

1986 ◽  
Vol 10 (4) ◽  
pp. 219-232
Author(s):  
F.P.J. Rimrott
Keyword(s):  
Energy Dissipation ◽  
Energy Loss ◽  
Experimental Evidence ◽  
Internal Energy ◽  
Dissipation Function ◽  
Structural Elements ◽  
Attitude Angle ◽  
Nutation Damper

In the present paper the secular attitude drift of a torquefree axisymmetric gyro is studied as a function of its attitude. By arguing that the gyro’s energy loss is due to the hystereses of its structural elements, an energy dissipation function is established, which is found to be proportional to an innate dissipativity of the gyro’s body and to the gyro’s attitude angle. It is then shown that deformations of the gyro configuration are required, to facilitate the attitude drift induced by dissipation. The deformed gyro configuration is found to be a function of the (slowly drifting) attitude angle only, thus making it nearly constant. As a consequence the concept of rigidity, so essential for gyrodynamics, need not be abandoned. The available experimental evidence is very sparse, but sufficient to show that typical satellites have innate dissipations in the order of microwatts due to structural hysteresis alone; and more, of course, when equipped with a nutation damper.

scholarly journals Pure Decoherence in Quantum Systems

2004 ◽  
Vol 11 (01) ◽  
pp. 53-61 ◽  
Author(s):  
Robert Alicki
Keyword(s):  
Energy Dissipation ◽  
Elastic Scattering ◽  
Energy Conservation ◽  
Harmonic Oscillator ◽  
Quantum Systems ◽  
Scattering Mechanism ◽  
Linear Coupling

A popular model of decoherence based on the linear coupling to harmonic oscillator heat baths is analysed and shown to be inappropriate in the regime where decoherence dominates over energy dissipation, called pure decoherence regime. The similar mechanism essentially related to the energy conservation implies that, on the contrary to some recent conjectures [21], chaotic environments can be less efficient decoherers than regular ones. Finally, the elastic scattering mechanism is advocated as the simplest source of pure decoherence.

scholarly journals Experimental Investigation of Flood Energy Dissipation by Single and Hybrid Defense System

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1971
Author(s):  
Afzal Ahmed ◽  
Abdul Razzaq Ghumman
Keyword(s):  
Energy Dissipation ◽  
Energy Loss ◽  
Delay Time ◽  
Hydraulic Jump ◽  
Average Energy ◽  
Defense System ◽  
Maximum Delay ◽  
Different Shapes ◽  
The Impact ◽  
Better Than

In this study, a series of laboratory experiments were conducted to investigate the energy loss through the hybrid defense system (HDS) in the order of dike, moat, and emergent vegetation in steady subcritical flow conditions. The results of HDS were compared with a single defense system (SDS) comprising only vegetation (OV). The dimensions of dike were kept constant while two different shapes (trapezoidal and rectangular) of moat were considered. The impacts of vegetation of variable thickness and density were investigated. Two combinations of HDS were investigated including the combination of dike and vegetation (DV) and the combination of dike, moat, and vegetation (DMV). The effect of backwater rise due to the vegetation, hydraulic jump formation and the impact of the arrival time of floodwater on energy dissipation were investigated. It was observed that on the upstream side of obstructions, the backwater depth increased by increasing the Froude number in both the SDS and HDS. The hydraulic jump observed in HDS was classified and the energy dissipation due to it was calculated. Under various conditions investigated in this paper, the maximum average energy dissipation was 32% in SDS and 46% in HDS. The trapezoidal moat performed better than rectangular moat as energy dissipater. The delay time was also greater with trapezoidal moat as compared to that in rectangular one. The maximum delay time was 140 s in the case of HDS. Hence, the hybrid defense system offered maximum resistance to the flow of water, thus causing a significant energy loss. For each case of SDS and HDS, empirical equations were developed by regression analysis to estimate the energy dissipation amounts.

Sign in / Sign up

Export Citation Format

Share Document