Ashkbiz Danehkar

Ashkbiz Danehkar: Publications: "Electron beam—plasma interaction in a dusty plasma with excess suprathermal electrons"

info@danehkar.net (Ashkbiz Danehkar) — Tue, 6 Dec 2011 08:04:11 +1000

"Electron beam—plasma interaction in a dusty plasma with excess suprathermal electrons"
A. Danehkar, N.S. Saini, M.A. Hellberg and I. Kourakis
AIP Conference Proceedings 1397, 305-306 (2011).

Ashkbiz Danehkar: Publications: "Large-amplitude electron-acoustic solitons in a dusty plasma with kappa-distributed electrons"

info@danehkar.net (Ashkbiz Danehkar) — Tue, 6 Dec 2011 08:04:11 +1000

"Large-amplitude electron-acoustic solitons in a dusty plasma with kappa-distributed electrons"
N. S. Saini, A. Danehkar, M. A. Hellberg, and I. Kourakis
AIP Conference Proceedings 1397, 357-358 (2011).

Ashkbiz Danehkar: Publications: "Electron-acoustic solitary waves in the presence of a suprathermal electron component"

info@danehkar.net (Ashkbiz Danehkar) — Thu, 11 Aug 2011 09:05:21 +1000

"Electron-acoustic solitary waves in the presence of a suprathermal electron component"
A. Danehkar, N.S. Saini, M.A. Hellberg and I. Kourakis
Physics of Plasmas 18, 072902 (2011).

Ashkbiz Danehkar: Publications: "Effect of superthermality on nonlinear electrostatic modes in plasmas"

info@danehkar.net (Ashkbiz Danehkar) — Thu, 10 Jun 2010 14:30:48 +1000

"Effect of superthermality on nonlinear electrostatic modes in plasmas"
S. Sultana, A. Danehkar, N. S. Saini, M. A. Hellberg, and I. Kourakis
Europhysics Conference Abstracts 34A, P2.410 (2010).

Ashkbiz Danehkar: Publications: "BF Models in Dual Formulations of Linearized Gravity"

info@danehkar.net (Ashkbiz Danehkar) — Thu, 10 Jun 2010 14:31:43 +1000

"BF Models in Dual Formulations of Linearized Gravity"
C. Bizdadea, E. M. Cioroianu, A. Danehkar, M. Iordache, S. O. Saliu, and S. C. Sararu
AIP Conference Proceedings 1131, 29-35 (2009).

Ashkbiz Danehkar: Publications: "On the significance of the Weyl curvature in a relativistic cosmological model"

info@danehkar.net (Ashkbiz Danehkar) — Wed, 9 Jun 2010 14:22:49 +1000

"On the significance of the Weyl curvature in a relativistic cosmological model"
A. Danehkar
Modern Physics Letters A 24, 3113-3127 (2009)

Ashkbiz Danehkar: Publications: "Consistent interactions of dual linearized gravity in D=5: couplings with a topological BF model"

info@danehkar.net (Ashkbiz Danehkar) — Wed, 9 Jun 2010 14:28:21 +1000

"Consistent interactions of dual linearized gravity in D=5: couplings with a topological BF model"
C. Bizdadea, E. M. Cioroianu, A. Danehkar, M. Iordache, S. O. Saliu, and S. C. Sararu
European Physical Journal C 63, 491-519 (2009).

Ashkbiz Danehkar: Resume: Fellowships and Awards

info@danehkar.net (Ashkbiz Danehkar) — Thu, 3 Jun 2010 14:21:00 +1000

International Macquarie University Research Excellence Scholarship (iMQRES), 2010 - 2013

Department for Employment and Learning (DEL) Northern Ireland Studentship, 2008 - 2009

Marie Curie Fellowship for Early Stage Training (MRTN-CT-2004-005104) , 2008

Ashkbiz Danehkar: Resume: Previous Affiliations

info@danehkar.net (Ashkbiz Danehkar) — Wed, 26 May 2010 14:16:53 +1000

Postgraduate Student
October 2008 - December 2009, Centre for Plasma Physics, Department of Physics & Astronomy, Queen's University of Belfast

Early-Stage Researcher
February - October 2008, Faculty of Physics, University of Craiova, Romania

Master's Thesis (Masterarbeit) Student
January - September 2007, Faculty for Computer Science and Electrical Engineering, University of Rostock

Ashkbiz Danehkar: Resume: Current Appointment

info@danehkar.net (Ashkbiz Danehkar) — Wed, 19 May 2010 14:15:17 +1000

PhD Candidate, April 2010 - Present
Department of Physics, Faculty of Science, Macquarie University

Conducted research to model the photoionization of the planetary nebulae surface brightness radius relation.
Funded support from the Macquarie University Research Excellence Scholarship (MQRES) Scheme.

Ashkbiz Danehkar: Resume: Qualifications

info@danehkar.net (Ashkbiz Danehkar) — Wed, 12 May 2010 14:04:02 +1000

Doctor of Philosophy, Physics and Astronomy, 2013 (expected)
Macquarie University, Sydney, Australia
Research Title: "Modeling the photoionization of the planetary nebulae surface brightness radius relation."

Master of Science, Plasma Physics, December 2009
Queen's University of Belfast, Belfast, UK
Research Project: "Propagation of electron-acoustic excitations in the presence of suprathermal background electrons - linear and nonlinear effects."

Master of Science, Computational Engineering, September 2007
University of Rostock, Rostock, Germany

Ashkbiz Danehkar: Previous Researches: Covariant Approach to General Relativity

info@danehkar.net (Ashkbiz Danehkar) — Wed, 28 Apr 2010 15:14:53 +1000

I have also used the (3 + 1)-covariant approach to general relativity. In this approach, we rewrite equations governing relativistic fluid dynamics by using project vector and project symmetric traceless tensors instead of metrics. I investigated the dynamic equations governing the Weyl curvature. The results show that the nonlocal interactions (tidal force and gravitational wave) are inconsistent without the magnetic part of the Weyl curvature.

Ashkbiz Danehkar: Previous Researches: BRST Quantization in Quantum Field Theory

info@danehkar.net (Ashkbiz Danehkar) — Wed, 28 Apr 2010 13:59:49 +1000

Previously, I have been awarded a Marie-Curie early-stage training fellowship for studying the BRST couplings between a background field (BF) and dual formulation of linearized gravity at the University of Craiova. The BRST formalism presents the local gauge symmetry as being a replacement for the original gauge symmetry. It provides useful way of studying the consistent interactions in gauge theories in terms of the deformation of the solution to the master equation. This investigation revealed that, for the first time, the dual formulation of linearized gravity is coupled to another theory, namely the topological BF model in (4 + 1)-dimensional spacetime.

Ashkbiz Danehkar: Previous Researches: Nonlinear Phenomena in Plasma Physics

info@danehkar.net (Ashkbiz Danehkar) — Wed, 14 Apr 2010 12:54:21 +1000

Prior to taking up my research position at Macquarie University, I was a postgraduate student in the Centre for Plasma Physics of the Department of Physics & Astronomy at the Queen's University of Belfast. My research project focused on the linear and nonlinear studies of acoustic-excitations in the presence of suprathermal electrons background. The propagation of acoustic nonlinear excitations in plasmas is particularly important, which lies at the intersection of plasma physics and nonlinear dynamics. We have observed the formation of solitary waves, which are associated with the mutual compensation between nonlinearity and dispersion. This topic is of particular interest since electron-accoutsic solitary waves often occur in space plasmas e.g. the Earth's bow shock, the auroral magnetosphere, and the Broadband Electrostatic Noise. I investigated the existence domains of stationary profile solitary waves and discussed how their characteristics depend on plasma parameters.

Ashkbiz Danehkar: Current research: photoionization modeling of planetary nebulae

info@danehkar.net (Ashkbiz Danehkar) — Thu, 8 Apr 2010 15:13:32 +1000

I currently focus mostly on planetary nebulae, accurate central star photometry, and calculating surface-brightness radius relation. My research aims to determine the nebular structure and photoionization, central star characteristics, and distance in conjunction with spectral-line mapping.

A planetary nebula is ionized plasma clouds, produced from a hot central star of low to intermediate mass that is towards the end of its evolution. Its origin has been the subject of several investigations in recent years. It is a key point to understand the late evolution of low- and intermediate-mass stars and the physical mechanism of mass loss for stellar evolution. Its properties of low-density dusty plasma may answer the remaining questions about the chemical composition of the interstellar medium and the chemical enrichment of our galaxy.

There are two possible mechanisms for the formation of the planetary nebulae: single stars and binary central stars. The first mechanism involves a combination of magnetic fields and stellar rotation, which produces an axisymmetric mass-loss and expends stellar winds. However, we observe certain non-spherical shapes arguing for the binary scenario. Hence, planetary nebulae depict a remarkably diverse range of shapes, ranging from axisymmetric to non-spherical forms.

In order to understand the nebular morphology, we need to determine the spectral-lines. It also involves the surface brightness of the nebula, since morphologies can be classified under the surface brightness to radius. The surface-brightness radius relation describes other nebular parameters such as the ionized mass and mean electron density. It is important to formulate a photoionization model, which can be applied to the surface-brightness radius relation. The spectral-lines can be then interpreted using the photoionization modeling analysis to match the nebular morphologies with observations. The photoionization model relates the observed power-law gradient of the surface-brightness radius relation to other nebular parameters.

Ashkbiz Danehkar: Introduction

info@danehkar.net (Ashkbiz Danehkar) — Thu, 8 Apr 2010 13:57:11 +1000

I am a PhD student in the Astronomy and Astrophysics group of the Department of Physics and Astronomy at Macquarie University. I currently focus mostly on planetary nebulae, accurate central star photometry, and calculating surface-brightness radius relation. My research aims to determine the nebular structure and photoionization, central star characteristics, and distance in conjunction with spectral-line mapping.