Manufacturing a Mechanical Unit for Grain Packing

2016 ◽  
Vol 7 (11) ◽  
pp. 837-846
Author(s):  
A. El-Sayed ◽  
M. Megahed ◽  
Y. Ramadan ◽  
A. El-Beba
Keyword(s):  
Mechanical Unit ◽  
Grain Packing

scholarly journals Design principles of hair-like structures as biological machines

2018 ◽  
Vol 15 (142) ◽  
pp. 20180206 ◽  
Author(s):  
Madeleine Seale ◽  
Cathal Cummins ◽  
Ignazio Maria Viola ◽  
Enrico Mastropaolo ◽  
Naomi Nakayama
Keyword(s):  
Mechanical Properties ◽  
Surface Area ◽  
Large Surface Area ◽  
Structural Basis ◽  
Basic Design ◽  
Form And Function ◽  
Mechanical Unit ◽  
Wide Range ◽  
Range Of Functions ◽  
And Function

Hair-like structures are prevalent throughout biology and frequently act to sense or alter interactions with an organism's environment. The overall shape of a hair is simple: a long, filamentous object that protrudes from the surface of an organism. This basic design, however, can confer a wide range of functions, owing largely to the flexibility and large surface area that it usually possesses. From this simple structural basis, small changes in geometry, such as diameter, curvature and inter-hair spacing, can have considerable effects on mechanical properties, allowing functions such as mechanosensing, attachment, movement and protection. Here, we explore how passive features of hair-like structures, both individually and within arrays, enable diverse functions across biology. Understanding the relationships between form and function can provide biologists with an appreciation for the constraints and possibilities on hair-like structures. Additionally, such structures have already been used in biomimetic engineering with applications in sensing, water capture and adhesion. By examining hairs as a functional mechanical unit, geometry and arrangement can be rationally designed to generate new engineering devices and ideas.

Modeling the role of phosphor grain packing in compact fluorescent lamps

2011 ◽  
Author(s):  
N. Pannier ◽  
M. Filoche ◽  
M. Plapp ◽  
V. Buissette ◽  
T. Le Mercier
Keyword(s):  
Fluorescent Lamps ◽  
Compact Fluorescent Lamps ◽  
Grain Packing

scholarly journals Taming the Janssen effect

2021 ◽  
Vol 249 ◽  
pp. 08004
Author(s):  
Louison Thorens ◽  
Knut Jørgen Måløy ◽  
Mickaël Bourgoin ◽  
Stéphane Santucci
Keyword(s):  
Magnetic Field ◽  
Radial Force ◽  
Dipole Interactions ◽  
Full Control ◽  
Grain Packing ◽  
Experimental Findings ◽  
The Magnetic Field ◽  
Measured Mass ◽  
Granular Column ◽  
True Mass

We investigate both experimentally and theoretically the apparent mass of a ferromagnetic granular assembly filling a cylindrical container and submitted to a magnetic field B, aligned vertically along the silo. We show that the mass of the ferromagnetic granular column depends strongly on the applied magnetic field. Notably, our measurements deviate strongly from the exponential saturation of the measured mass as a function of the true mass of the grain packing, as predicted by Janssen [H.A. Janssen, Vereins Eutscher Ingenieure Zeitschrift, 1045 (1895)]. In particular, the measured mass of tall columns decreases systematically as the amplitude of the magnetic field increases. We rationalize our experimental findings by considering the induced magnetic dipole-dipole interactions within the whole packing. We show the emergence of a global magnetic radial force along the walls of the silos, fully determined by the external magnetic field. The resulting tunable frictional interactions allows a full control of the effective mass of the ferromagnetic granular column.

NEWMARKET TILL AQUITARD: OPTIMUM GRAIN PACKING, WITH A PORE FILLING CEMENT GENERATES PSEUDO-CONCRETE

2016 ◽  
Author(s):  
Bruce Kjarsgaard ◽  
◽  
Ross D. Knight ◽  
H.A.J. Russell ◽  
David Sharpe ◽  
...  
Keyword(s):  
Pore Filling ◽  
Grain Packing

Prey capture in the chain pickerel, Esox niger: correlations between feeding and locomotor behavior

1981 ◽  
Vol 59 (6) ◽  
pp. 1072-1078 ◽  
Author(s):  
David M. Rand ◽  
George V. Lauder
Keyword(s):  
High Speed ◽  
Prey Capture ◽  
Mouth Opening ◽  
Predatory Behavior ◽  
Jaw Movements ◽  
Suction Velocity ◽  
Locomotor Pattern ◽  
Mechanical Unit ◽  
High Speed Cinematography ◽  
Locomotor Patterns

The predatory behavior of the chain pickerel Esox niger was studied by high-speed cinematography to correlate patterns of jaw bone movement with locomotor patterns. Pattern B strikes were initiated at significantly shorter distances from the prey, had higher acceleration rates, and the velocity of mouth opening and suspensorial abduction was greater than for pattern A strikes. No difference was found in the excursion amplitudes of jaw movements between pattern A and pattern B strikes. Significant differences were found between midwater and corner strikes in the amplitude of mouth opening and hyoid depression: both were smaller in corner attacks and suction velocity was higher. Both velocity and amplitude of each mechanical unit in the head can be varied depending on the locomotor pattern and the position of the prey.

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