scholarly journals Experimental studies on the mechanics of cohesive frictional granular media

2013 ◽  
Author(s):  
R. K. Kandasami ◽  
T. G. Murthy
Keyword(s):  
Granular Media ◽  
Experimental Studies

SEISMIC WAVE PROPAGATION IN POROUS GRANULAR MEDIA

Geophysics ◽  
1956 ◽  
Vol 21 (3) ◽  
pp. 691-714 ◽  
Author(s):  
Norman R. Paterson
Keyword(s):  
Granular Media ◽  
Experimental Studies ◽  
Seismic Wave Propagation ◽  
Beach Sand ◽  
Sound Waves ◽  
Filling Materials ◽  
Porosity And Permeability ◽  
Size Sorting ◽  
The Media ◽  
A Charge

Theoretical and experimental studies have been made of the manner in which sound waves are propagated in porous granular aggregates. A cylindrical piezo‐electric source is used and this simulates the explosion of a charge in a seismic shot‐hole. It is found that in general two waves of volume expansion are propagated and that these involve coupled displacements of both constituents of the media. The waves are termed frame‐waves, air‐waves or liquid‐waves depending upon the nature of the pore‐filler and the relative displacements of the constituents. The frame‐wave velocity is dependent upon the strength of the frame, the densities of solid and pore‐filling materials and the texture of the medium. Air‐ and liquid‐wave velocities are related to the texture of the medium and to the density and viscosity of the pore‐filler. Frame‐strength is important to a lesser degree. Waves are dispersive only in the case of media of very low permeability. Attenuation is related to viscosity, texture and frequency. Scattering is probably important only at the highest frequencies and largest particle diameters used in the experiments. It is shown that porosity and permeability of a beach sand can be inferred from velocity measurements. These properties provide information regarding grain‐size, sorting and the nature of the pore‐filler.

scholarly journals Technological effect of processing with the organic granular media flows

2018 ◽  
Vol 226 ◽  
pp. 01026 ◽  
Author(s):  
Yevgeniy Y. Krupenya ◽  
Marina A. Boyko ◽  
Antonina P. Shishkina
Keyword(s):  
Granular Media ◽  
Experimental Studies ◽  
Organic Media ◽  
Metal Scrap ◽  
Energy Impact ◽  
Threshold Amplitude ◽  
The Media ◽  
Media Flows ◽  
Working Tank ◽  
Effect Of Surface

There has been carried out the analysis of approaches how to model vibrational processing by granulated media. The vibroprocessing model has been developed, that provides effective parts’ surfaces finishing work with granules of stone organic media initially based on the approach of energy impact of the granule flow on the processed surface. Specific volumetric metal scrap has been used as the main characteristic of processing with organic media its physical aim is increase rate of thickness of the material removed from the surface in the frames of definite velocity and pressure of the media. It is shown that metal scrap depends on media flow velocity, granular media height of the loading column, conditions that form stationary circulation motion of the media. Taking into account the analysis of experimental studies results of amplitude-frequency characteristics influence on the metal scrap during of abrasive granules vibroprocessing, there has been disclosed some certain dependence of the specific volume metal scrap while organic media processing, considering threshold amplitude and frequency of oscillations of the working tank that made it possible to observe the effect of surface treatment is. The established dependence describing the effective vibroprocessing conditions with stone organic media that was achieved due to experimental data which allows to assume validity of the obtained model.

scholarly journals Determination of the duration of deburring at vibro-abrasive treatment of parts in organic media

2020 ◽  
Vol 329 ◽  
pp. 03024
Author(s):  
Yelena Kolganova ◽  
Ivan Vyalikov ◽  
Anna Azarova ◽  
Roman Mishchenko ◽  
Georgiy Sanamyan
Keyword(s):  
Process Model ◽  
Granular Media ◽  
Treatment Process ◽  
Experimental Studies ◽  
Organic Media ◽  
Complex Profile ◽  
Vibration Treatment ◽  
Working Media ◽  
Cleaning Treatment

Basing on the radio-electronic equipment parts design and technological features analysis and granular media vibration treatment process main technological principles, a process model has been developed providing surfaces parts effective finishing and cleaning treatment by means of organic origin working media. Complex-profile devices parts bone organic media vibration treatment experimental studies have been carried out.

Prediction of Dynamic Contact Loads in Granular Assemblies

1991 ◽  
Vol 58 (2) ◽  
pp. 341-346 ◽  
Author(s):  
C. Y. Zhu ◽  
A. Shukla ◽  
M. H. Sadd
Keyword(s):  
Granular Media ◽  
Load Transfer ◽  
Experimental Studies ◽  
Contact Angles ◽  
Contact Load ◽  
Maximum Output ◽  
Hybrid Technique ◽  
Transfer Coefficients ◽  
Principle Of Superposition ◽  
Contact Loads

An experimental-numerical hybrid technique has been developed to predict the intergranular contact load transfer in granular media subjected to explosive loading. The granular media were simulated by assemblies of circular disks in contact. The peak contact load transfer coefficients (i. e., the ratio of the maximum output contact load to the input contact load as a function of the contact angles) of a given particle were obtained through controlled experimental studies. These coefficients, along with the principle of superposition, were then used to predict the peak contact loads in several regular as well as irregular assemblies of disks. The predicted results compared favorably with the experimental data for several different assemblies.

3-D reconstruction and analysis of mammalian mitotic spindle structure

1992 ◽  
Vol 50 (1) ◽  
pp. 578-579
Author(s):  
Kent McDonald ◽  
David Mastronarde ◽  
Rubai Ding ◽  
Eileen O'Toole ◽  
J. Richard McIntosh
Keyword(s):  
Cross Sections ◽  
Mitotic Spindle ◽  
Experimental Studies ◽  
Video Camera ◽  
Three Dimensions ◽  
Mitotic Spindles ◽  
Black And White ◽  
Reconstruction Methods ◽  
Spindle Structure ◽  
Tissue Culture Line

Mammalian spindles are generally large and may contain over a thousand microtubules (MTs). For this reason they are difficult to reconstruct in three dimensions and many researchers have chosen to study the smaller and simpler spindles of lower eukaryotes. Nevertheless, the mammalian spindle is used for many experimental studies and it would be useful to know its detailed structure.We have been using serial cross sections and computer reconstruction methods to analyze MT distributions in mitotic spindles of PtK cells, a mammalian tissue culture line. Images from EM negatives are digtized on a light box by a Dage MTI video camera containing a black and white Saticon tube. The signal is digitized by a Parallax 1280 graphics device in a MicroVax III computer. Microtubules are digitized at a magnification such that each is 10-12 pixels in diameter.

Effects of Attachment Styles on the Experience of Equity in Heterosexual Couples Relationships

2003 ◽  
Vol 50 (4) ◽  
pp. 298-310 ◽  
Author(s):  
Ina Grau ◽  
Jörg Doll
Keyword(s):  
Attachment Theory ◽  
Attachment Style ◽  
Intimate Relationships ◽  
Attachment Styles ◽  
Experimental Studies ◽  
The Other ◽  
Heterosexual Couples ◽  
Secure Attachment ◽  
Dependent Variables ◽  
Equity Ratio

Abstract. Employing one correlational and two experimental studies, this paper examines the influence of attachment styles (secure, anxious, avoidant) on a person’s experience of equity in intimate relationships. While one experimental study employed a priming technique to stimulate the different attachment styles, the other involved vignettes describing fictitious characters with typical attachment styles. As the specific hypotheses about the single equity components have been developed on the basis of the attachment theory, the equity ratio itself and the four equity components (own outcome, own input, partner’s outcome, partner’s input) are analyzed as dependent variables. While partners with a secure attachment style tend to describe their relationship as equitable (i.e., they give and take extensively), partners who feel anxious about their relationship generally see themselves as being in an inequitable, disadvantaged position (i.e., they receive little from their partner). The hypothesis that avoidant partners would feel advantaged as they were less committed was only supported by the correlational study. Against expectations, the results of both experiments indicate that avoidant partners generally see themselves (or see avoidant vignettes) as being treated equitably, but that there is less emotional exchange than is the case with secure partners. Avoidant partners give and take less than secure ones.

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