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مرکز اطلاعات علمی SID1
اسکوپوس
دانشگاه غیر انتفاعی مهر اروند
ریسرچگیت
strs
Issue Info: 
  • Year: 

    2017
  • Volume: 

    6
  • Issue: 

    12
  • Pages: 

    67-70
Measures: 
  • Citations: 

    0
  • Views: 

    1179
  • Downloads: 

    279
Abstract: 

Colliding high energy cosmic rays to the earth atmosphere produces secondary particles which generate EXTENSIVE AIR shower (EAS) that develops in lateral and longitudinal directions. It was found that electron density in two directions is related to the age parameter. Dai et. al. [1] clarified the difference between the lateral and longitudinal age parameters in 1990. However, some scientists believe that the lateral age parameter from NKG model is not sufficient to describe the electro lateral dispersion. In the current study, given the experimental and simulation data and also given the results of Dai et. al. work, the dependence of the lateral and longitudinal age parameter to core distance is investigated. Finally, contrary to NKG theory, at Linsley theory, the age parameter is not a constant parameter, so it increases with an increase in core distance.

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Issue Info: 
  • Year: 

    2009
  • Volume: 

    8
  • Issue: 

    4
  • Pages: 

    159-165
Measures: 
  • Citations: 

    0
  • Views: 

    51913
  • Downloads: 

    26649
Abstract: 

Secondary electrons at ground level of simulated EXTENSIVE AIR SHOWERS have been analyzed using a wavelet transform based technique, in order to investigate the variation of fractal dimensions of the lateral distribution of the electrons with shower energy and primary particle mass number. The fractal dimension is shown to increase with shower energy and seems to saturate to constant values near the core of the shower at higher energies. Using the fractal dimension properties at different core distances, a multi-parameter separation technique is then applied to the data. It has been shown that the technique has good accuracy at high energy, provided the energy of the shower is obtained independently.

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Issue Info: 
  • Year: 

    2020
  • Volume: 

    9
  • Issue: 

    4 (23)
  • Pages: 

    33-41
Measures: 
  • Citations: 

    0
  • Views: 

    243
  • Downloads: 

    152
Abstract: 

In this research, using CORSIKA simulation code with QGSJETII04 and GHEISHA2002d as high and low energy interaction models respectively, proton and iron cosmic ray primaries with 10 17 eV energy and 20-60 o zenith angle are simulated at Tehran observation level (1200m above sea level). By using azimuth angle, arrival time and local coordinates of the muon and electron secondaries as well as rise times of received pulses are calculated. By investigating the rise time as a function of the distance to the Shower Core for different azimuth angle, it is shown that there is an azimuthal asymmetry in the rise time distribution which can be used for mass discrimination of primary cosmic rays.

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گارگاه ها آموزشی
Author(s): 

PURMOHAMMAD D.

Issue Info: 
  • Year: 

    2012
  • Volume: 

    12
  • Issue: 

    3
  • Pages: 

    49-53
Measures: 
  • Citations: 

    0
  • Views: 

    1020
  • Downloads: 

    111
Abstract: 

Deviation angles of secondary electrons and muons in simulated EXTENSIVE AIR SHOWERS were studied. The angles have wide distribution, whose width depends on energy cuts imposed on shower particles. In this work, variation of deviation angles with the energy of secondary particles, shower energy, primary direction, and core distance was investigated. The results put limitations on application of hodoscopic devices in cosmic ray and gamma ray observations.

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Author(s): 

Bahmanabadi Mahmud

Issue Info: 
  • Year: 

    2017
  • Volume: 

    17
  • Issue: 

    3
  • Pages: 

    473-484
Measures: 
  • Citations: 

    0
  • Views: 

    413
  • Downloads: 

    184
Abstract: 

The first phase of the Alborz Observatory Array (Alborz-1) consists of 20 plastic scintillation detectors each one with surface area of 0. 25 spread over an area of realized to the study of EXTENSIVE AIR SHOWERS around the knee at the Sharif University of Technology campus. The first stage of the project including construction and operation of a prototype system has now been completed and the electronics that will be used in the array instrument has been tested under field conditions. In order to achieve a realistic estimate of the array performance, a large number of simulated CORSIKA SHOWERS have been used. In the present work, theoretical results obtained in the study of different array layouts and trigger conditions are described. Using Monte Carlo simulations of SHOWERS the rate of detected events per day and the trigger probability functions, i. e., the probability for an EXTENSIVE AIR shower to trigger a ground based array as a function of the shower core distance to the center of array are presented for energies above 1 TeV and zenith angles up to. Moreover, the angular resolution of the Alborz-1 array is obtained. For experimental study of the array, Alborz-1 sub-array consists of 5 detectors on a pentagon configuration similar to the central cluster of the Alborz-1 array have been collecting data since 2014 February for 14 month in 4th floor of physics department at Sharif University of Technology. Alborz-I, made of 20 scintillation detectors is set up in a cluster layout to study the cosmic ray spectrum in the energy range of 1012 to 1016 eV. . This paper reveals the zenith angle distribution function of detected AIR SHOWERS by this sub-array.

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Author(s): 

JONES P.D. | MOBERG A.

Journal: 

JOURNAL OF CLIMATE

Issue Info: 
  • Year: 

    2003
  • Volume: 

    16
  • Issue: 

    2
  • Pages: 

    206-223
Measures: 
  • Citations: 

    447
  • Views: 

    27223
  • Downloads: 

    26465
Keywords: 
Abstract: 

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strs
Author(s): 

Khakian Ghomi m.

Issue Info: 
  • Year: 

    2016
  • Volume: 

    3
  • Issue: 

    2
  • Pages: 

    149-165
Measures: 
  • Citations: 

    0
  • Views: 

    39206
  • Downloads: 

    12337
Abstract: 

Alborz observatory is an EAS array in the heights of Alborez mountain chain near Tehran. For the development of the array, more number of detectors is inevitable. The managing the financial resources and achieving the highest efficiency of the array is important for the project. Therefore, Water Cherenkov Detectors has been used for 9 months in the same way as the previous experiment with Scintillation Detectors in a 4-fold square arrangement. After a hardware calibration procedure, the experimental data set was simulated by CORSIKA code and the experimental restrictions were applied over the data set. In this work, the simulation is calibrated with the real experimental results, and it presents a comparable parameter between the experiment and the simulation. The obtained results show that the simulation is in agreement with the experimental results.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    1
  • Issue: 

    4
  • Pages: 

    23-32
Measures: 
  • Citations: 

    0
  • Views: 

    629
  • Downloads: 

    192
Abstract: 

An 1D hydrodynamic model has been simulation and developed for gas hold-up and liquid circulation velocity prediction in AIR-lift reactors. model is based on momentum balance equations and has been adjusted to experimental data collected on a pilot plant reactor equipped with two types of gas distributors and using water as the liquid phase.The model equations described previously constitute a set of non-linear equations which are solved by an iterative procedure (v.b) (c plus). This model has also been combined with mass transfer and the kinetics of a chemical reaction to yield a complete model of the performance of a reactor.

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Author(s): 

RASTGARZADEH G.

Issue Info: 
  • Year: 

    2006
  • Volume: 

    6
  • Issue: 

    2
  • Pages: 

    87-94
Measures: 
  • Citations: 

    0
  • Views: 

    664
  • Downloads: 

    197
Abstract: 

Monte Carlo simulation with CORSIKA code using QGSJET hadronic interaction model is applied on more than 5000 cosmic ray primaries to investigate dependence of maximum AIR shower development (Hmax) on mass and energy of, primaries.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    10
  • Issue: 

    1
  • Pages: 

    47-53
Measures: 
  • Citations: 

    0
  • Views: 

    945
  • Downloads: 

    257
Abstract: 

Different high energy interaction models are the applied in CORSIKA code to simulate EXTENSIVE AIR SHOWERS (EAS) generated by Cosmic Rays (CR). In this work the effects of QGSJET01, QGSJETII, DPMJET, SIBYLL models on Xmax and multiplicity of secondary electrons and muons at observation level are studied.

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