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Experimental observation of ion-acoustic waves in an inhomogeneous dusty plasma (2001)

Liang, Xiaoping ; Zheng, Jian ; Ma, J. X. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Physics of Plasmas 8 (2001), S. 1459-1462

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ISSN: 1089-7674

Source: AIP Digital Archive

Topics: Physics

Notes: The propagation of a dust-ion-acoustic wave (DIAW) wave down the steep density gradient in an inhomogeneous diffusive dusty plasma is experimentally studied. It is observed that the presence of the dust enhances the plasma inhomogeneity. The phase velocity of the DIAW increases rapidly with distance and becomes supersonic. The interplay between the effects of the density nonuniformity and collisional damping results in the continuous transition of the relative amplitude of the DIAW from damping to growth. The experimental data are in agreement with theoretical prediction and confirm the importance of density-dependent ion–dust collisions. © 2001 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1362530

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Machining Characteristics of Al2O3/6061Al Composite using Rotary EDM with a Disklike Electrode (2000)

Yan, B. H. ; Wang, C. C. ; Liu, W. D. ; [et al.]

Springer

The international journal of advanced manufacturing technology 16 (2000), S. 322-333

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ISSN: 1433-3015

Keywords: Keywords: Disklike electrode; EDM; Electrode wear rate; Material removal rate; Metal matrix composite; Relative electrode wear rate; Surface roughness

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: This work optimises the cutting of Al2O3/6061Al composite using rotary electro-discharging machining (EDM) with a disklike electrode by using Taguchi methodology. The Taguchi method is used to formulate the experimental layout, to analyse the effect of each EDM parameter on the machining characteristics, and to predict the optimal choice for each EDM parameter. Four observed values, MRR, EWR, REWR, and SR, are used to verify this optimisation of the machining technique. In addition, six independent parameters are chosen as variables in evaluating the Taguchi method and are categorised into two groups: 1. Electrical parameters, e.g. polarity, peak current, pulse duration, and powder supply voltage. 2. Non-electrical parameters, e.g. circumferential speed of electrode, reciprocating speed. The analysis of the Taguchi method reveals that, in general, the electrical group more significantly affects the machining characteristics than the non-electrical group. Also derived herein are semi-empirical equation that contain all of the machining characteristics. Experimental results are presented to illustrate the proposed approach.