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Effect of particle size distribution on magnetic behavior of nanoparticles with uniaxial anisotropy

Chinese Physics B 2018年第9期27卷 572-576页

作者： S Rizwan Ali Farah Naz Humaira Akber m Naeem S Imran Ali S Abdul Basit m sarim Sadaf Qaseem Department of Physics Federal Urdu University of Arts Science and Technology Department of Applied Chemistry and Chemical Technology University of Karachi Department of Computer Science Federal Urdu University of Arts Science and Technology

The effect of particle size distribution on the field and temperature dependence of the hysteresis loop features like coercivity（HC）, remanence（mR）, and blocking temperature（TB） is simulated for an ensemble of single domain ferromagnetic nanoparticles with uniaxial anisotropy. Our simulations are based on the two-state model for T 〈 TB and the metropolis monte-Carlo method for T 〉 TB. It is found that the increase in the grain size significantly enhances HC and TB. The presence of interparticle exchange interaction in the system suppresses HC but causes mRto significantly *** results show that the parameters associated with the particle size distribution（D（d,δ）） such as the mean particle size d and standard-deviation δ play key roles in the magnetic behavior of the system.

关键词： magnetic nanoparticles monte Carlo simulations size distribution interparticle interaction hysteresis

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Rock fragmentation control in opencast blasting

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Journal of Rock mechanics and Geotechnical Engineering 2016年第2期8卷 225-237页

作者： P.K.Singh m.P.Roy R.K.Paswan md.sarim Suraj Kumar Rakesh Ranjan Jha CSIR-Central Institute of mining and Fuel Research

The blasting operation plays a pivotal role in the overall economics of opencast *** blasting subsystem affects all the other associated sub-systems,***,transport,crushing and milling *** control through effective blast design and its effect on productivity are the challenging tasks for practicing blasting engineer due to inadequate knowledge of actual explosive energy released in the borehole,varying initiation practice in blast design and its effect on explosive energy release *** paper describes the result of a systematic study on the impact of blast design parameters on rock fragmentation at three mines in *** mines use draglines and shoveledumper combination for removal of *** its pivotal role in controlling the overall economics of a mining operation,the expected blasting performance is often judged almost exclusively on the basis of poorly defined parameters such as powder factor and is often qualitative which results in very subjective assessment of blasting *** an approach is very poor substitutes for accurate assessment of explosive and blasting *** one blasts were conducted with varying blast designs and charging patterns,and their impacts on the rock fragmentation were documented.A high-speed camera was deployed to record the detonation sequences of the *** efficiency of the loading machines was also correlated with the mean fragment size obtained from the fragmentation analyses.

关键词： Opencast blast Rock fragmentation Explosives performance Dragline efficiency Fragment size

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