Md. H A S I B Uddin - Profile on Academia.edu (original) (raw)
I am Md. Hasib Uddin, M.S.S in Victimology. Chief Editor
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Università Telematica Internazionale Uninettuno
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Papers by Md. H A S I B Uddin
Three-dimensional numerical simulations of the tearing instability in the framework of compressib... more Three-dimensional numerical simulations of the tearing instability in the framework of compressible and resistive magnetohydrodynamics are presented. Simulations have been performed with a novel Eulerian conservative high order code, including an explicit resistivity, which uses implicit high order numerical schemes having higher spectral resolution than classical schemes. The linear and non linear evolution of the tearing instability has been followed for force-free and pressure-balanced initial equilibrium configurations. Pressure equilibrium configurations are subject to a secondary instability which drives the system toward a quasi two dimensional structure oriented perpendicularly to the initial configuration. The development of secondary instabilities is suppressed by a guide field allowing the coalescence instability to fully develop in the system. Force-free initial configurations follow an intermediate path with respect the previous cases: Strong coalescence of magnetic islands, due to the non linear evolution of the tearing instability, is observed before the system enters in a phase dominated by 3D modes. The histories of the differing initial current-sheet equilibria have counterparts in the energy spectra that, for all three cases, are observed to be strongly anisotropic.
একটি নদীমাতৃক দেশ বাংলাদেশ। শাখা-প্রশাখাসহ প্রায় ৮০০ নদ-নদী বিপুল জলরাশি নিয়ে ২৪,১৪০ কিলোমিটার ... more একটি নদীমাতৃক দেশ বাংলাদেশ। শাখা-প্রশাখাসহ প্রায় ৮০০ নদ-নদী বিপুল জলরাশি নিয়ে ২৪,১৪০ কিলোমিটার জায়গা দখল করে দেশের মধ্য দিয়ে প্রবাহিত হয়েছে। বাংলাদেশের অধিকাংশ এলাকাই শত শত নদীর মাধ্যমে বয়ে আসা পলি মাটি জমে তৈরি হয়েছে। বাংলাদেশের প্রধান প্রধান নদ-নদীসমূহের মধ্যে গঙ্গা-পদ্মা, ব্রহ্মপুত্র-যমুনা ও মেঘনা এ ৩টি অন্যতম প্রধান ও সুবৃহৎ আন্তর্জাতিক নদীমালা কর্তৃক বাহিত পলিতে গঠিত এ বাংলাদেশ।
Teaching Documents by Md. H A S I B Uddin
Md. Hasib Uddin, 2018
Introduction:-Now a days, environmental pollution is a major cause for concern, not only for us, ... more Introduction:-Now a days, environmental pollution is a major cause for concern, not only for us, but also for the whole mankind. In the last century, the rise of this menace assumed so gigantic that it has cast its melancholic shadow on nature itself. The diminishing ozone ionosphere leading to global warming and the unpredictable seasonal variations are some of the adverse effects of worldwide environmental pollution that are threatening to the existence of human beings on this planet.
Three-dimensional numerical simulations of the tearing instability in the framework of compressib... more Three-dimensional numerical simulations of the tearing instability in the framework of compressible and resistive magnetohydrodynamics are presented. Simulations have been performed with a novel Eulerian conservative high order code, including an explicit resistivity, which uses implicit high order numerical schemes having higher spectral resolution than classical schemes. The linear and non linear evolution of the tearing instability has been followed for force-free and pressure-balanced initial equilibrium configurations. Pressure equilibrium configurations are subject to a secondary instability which drives the system toward a quasi two dimensional structure oriented perpendicularly to the initial configuration. The development of secondary instabilities is suppressed by a guide field allowing the coalescence instability to fully develop in the system. Force-free initial configurations follow an intermediate path with respect the previous cases: Strong coalescence of magnetic islands, due to the non linear evolution of the tearing instability, is observed before the system enters in a phase dominated by 3D modes. The histories of the differing initial current-sheet equilibria have counterparts in the energy spectra that, for all three cases, are observed to be strongly anisotropic.
একটি নদীমাতৃক দেশ বাংলাদেশ। শাখা-প্রশাখাসহ প্রায় ৮০০ নদ-নদী বিপুল জলরাশি নিয়ে ২৪,১৪০ কিলোমিটার ... more একটি নদীমাতৃক দেশ বাংলাদেশ। শাখা-প্রশাখাসহ প্রায় ৮০০ নদ-নদী বিপুল জলরাশি নিয়ে ২৪,১৪০ কিলোমিটার জায়গা দখল করে দেশের মধ্য দিয়ে প্রবাহিত হয়েছে। বাংলাদেশের অধিকাংশ এলাকাই শত শত নদীর মাধ্যমে বয়ে আসা পলি মাটি জমে তৈরি হয়েছে। বাংলাদেশের প্রধান প্রধান নদ-নদীসমূহের মধ্যে গঙ্গা-পদ্মা, ব্রহ্মপুত্র-যমুনা ও মেঘনা এ ৩টি অন্যতম প্রধান ও সুবৃহৎ আন্তর্জাতিক নদীমালা কর্তৃক বাহিত পলিতে গঠিত এ বাংলাদেশ।
Md. Hasib Uddin, 2018
Introduction:-Now a days, environmental pollution is a major cause for concern, not only for us, ... more Introduction:-Now a days, environmental pollution is a major cause for concern, not only for us, but also for the whole mankind. In the last century, the rise of this menace assumed so gigantic that it has cast its melancholic shadow on nature itself. The diminishing ozone ionosphere leading to global warming and the unpredictable seasonal variations are some of the adverse effects of worldwide environmental pollution that are threatening to the existence of human beings on this planet.