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RISS 인기검색어
- 검색키워드
- 저자 : Arvind Varma (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Combustion Synthesis of Advanced Materials : Fundamentals and Applications
Varma, Arvind,Mukasyan, Alexander S. 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
The combustion synthesis(CS) of materials is an advanced approach in powder metallurgy. The number of products synthesized by CS has increased rapidly during recent years and currently exceeds 1,000 different compounds. The same features, such as high temperatures and rates, self-sustained manner of microstructure formation in non-equilibrium conditions, that make CS an attractive technology also define difficulties to study the nature and mechanism of this process, which in turn are essential to control the properties of the synthesized materials. In this survey paper, we present results of our recent work both in fundamental studies of mechanisms for rapid reaction wave propagation in heterogeneous media and in using the CS approach to synthesized different types of advanced materials, including bio-alloys and nano-sized powders.
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Combustion Synthesis of Advanced Materials: Fundamentals and Applications
Arvind Varma,Alexander S. Mukasyan 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
The combustion synthesis (CS) of materials is an advanced approach in powder metalurgy. The numberof products synthesized by CS has increased rapidly during recent years and currently exceeds 1,000 diferent com-pounds. The same features, such as high temperatures and rates, self-sustained manner of microstructure formationin non-equilibrium conditions, that make CS an attractive technology also define difficulties to study the nature andmechanisms of this proces, which in turn are esential to control the properties of the synthesized materials. In thissurvey paper, we present results of our recent work both in fundamental studies of mechanisms for rapid reaction wavepropagation in heterogeneous media and in using the CS approach to synthesize diferent types of advanced materials,including bio-aloys and nano-sized powders.
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Acceleration of electrons by a lower hybrid wave in a magnetic mirror
Jeet Ram,Kumar Arvind,Kumar Asheel,Babu Sanjay,Varma Ashish 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.12
In the present study, a theory of electron acceleration by a very large-amplitude lower hybrid wave (LHW) in a magnetic mirror having frequency less than the plasma frequency is developed. The LHW has a Gaussian mode profile and is localized due to the parabolic plasma density and the magnetic field profile. The mode can be excited by launching an electron beam from outside into the magnetic mirror. Large-amplitude LWHs have potential to axially trap the electrons when they are moving nearly parallel to the phase velocity, where parallel refers to the direction of the axial magnetic field. The energy of the electrons is enhanced at the instant of interaction between the wave and the electrons. The acceleration of electrons possibly stops as the electrons gets out of phase with the wave. The transverse field of the mode favors stronger mirror confinement and increases the dephasing length. This theory can accelerate electrons up to keV energies and can be employed in the heating of electrons in a magnetic mirror.
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