Experimental Investigation of Size Effects of FCC Polycrystal by Shear Banding

1999 ◽  
Vol 121 (2) ◽  
pp. 156-161
Author(s):  
Osamu Watanabe ◽  
Takayuki Kurata
Keyword(s):  
Size Effect ◽  
Cross Section ◽  
Size Effects ◽  
Rectangular Cross Section ◽  
Pure Aluminum ◽  
Shear Banding ◽  
Compressive Loading ◽  
Thickness Effect ◽  
Internal Mechanism ◽  
Meso Scale

Several plasticity phenomena display a size effect where the smaller the size is the stronger its response. This effect relates to the plastic gradients, appearing in plastically inhomogeneous material. The present paper describes results of an experimental meso-scale study using the specimens having rectangular cross section made of FCC polycrystal of pure Aluminum and OFHC Copper under the tensile or compressive loading. Experimental measurements are carried out to investigate thickness effect and grain size effect in connection with size effect, and the internal mechanism of plastic flow in the specimens is also discussed.

scholarly journals Classical Size Effects in Films of n-PbTe

2015 ◽  
Vol 16 (4) ◽  
pp. 661-666
Author(s):  
M.A. Ruvinskii ◽  
B.S. Dzundza ◽  
O.B. Kostyuk
Keyword(s):  
Experimental Data ◽  
Boltzmann Equation ◽  
Seebeck Coefficient ◽  
Cross Section ◽  
Size Effects ◽  
Theoretical Calculations ◽  
Rectangular Cross Section ◽  
Charge Carriers ◽  
Kinetic Boltzmann Equation ◽  
Classical Size

Based on kinetic Boltzmann equation the boundary problem of calculating the conductivity and Seebeck coefficient for a film with a rectangular cross section is solved. Mirror- diffuse mechanism of reflection of the charge carriers from the surfaces of the film is considered. Calculations were performed for different thicknesses nondegenerate semiconductor n-PbTe. A comparison of theoretical calculations with obtained experimental data for vapor-phase condensates based on PbTe is made.

Size Effects on the Scattering of Electron and Spherical Dust Grain in Dusty Plasmas

2010 ◽  
Vol 65 (12) ◽  
pp. 1147-1150
Author(s):  
Dae-Han Ki ◽  
Young-Dae Jung
Keyword(s):  
Size Effect ◽  
Cross Section ◽  
Size Effects ◽  
Debye Length ◽  
Dusty Plasmas ◽  
Scattering Cross Section ◽  
Charged Dust ◽  
Scattering Cross ◽  
Dust Grain ◽  
The Impact

The finite size effects of the charged dust grain on the electron-dust grain collisions are investigated in complex dusty plasmas. The stationary phase analysis and the effective potential due to the renormalized dust charge are employed to obtain the phase shift for the scattering of the electron and the spherically charged dust grain as a function of the impact parameter, collision energy, Debye length, and dust radius. It is found that the size effect of the dust grain enhances the electron-dust grain scattering cross section in dusty plasmas. It is also found that the size effect on the scattering cross section increases with increasing plasma density. In addition, it is found that the size effect on the electron-dust scattering cross section decreases with an increase of the plasma temperature.

Fabricated structures for studying mesoscopic physics of charge density waves

2002 ◽  
Vol 12 (9) ◽  
pp. 185-186
Author(s):  
K. O'Neill ◽  
E. Slot ◽  
H. van der Zant ◽  
K. Cicak ◽  
R. Thorne
Keyword(s):  
Electron Beam ◽  
Cross Section ◽  
Electron Beam Lithography ◽  
Size Effects ◽  
Rectangular Cross Section ◽  
Charge Density Waves ◽  
Mesoscopic Physics ◽  
Niobium Triselenide ◽  
New Methods

We present new methods for patterning and controlling the cross-section of the CDW conductor niobium triselenide crystals to sub-micron dimensions using photolithography and electron beam lithography. Experiments demonstrating these techniques are presented: accurate four-probe measurement of the c-axis resistivity as a function of temperature, and measurements of width and thickness-dependent size effects on the CDW condensate. In all samples, a region with near-perfect rectangular cross-section is left to provide a control, eliminating the need to compare different samples and reduces the role of sample-to-sample variations in the analyses.

scholarly journals Designing for People’s Safety on Flooded Streets: Uncertainties and the Influence of the Cross-Section Shape, Roughness and Slopes on Hazard Criteria

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2119
Author(s):  
Luís Mesquita David ◽  
Rita Fernandes de Carvalho
Keyword(s):  
Cross Section ◽  
Overland Flow ◽  
Rectangular Cross Section ◽  
Safety Hazard ◽  
Cross Section Shape ◽  
Section Shape ◽  
Flood Flows ◽  
The Cross ◽  
Flooding Risk

Designing for exceedance events consists in designing a continuous route for overland flow to deal with flows exceeding the sewer system’s capacity and to mitigate flooding risk. A review is carried out here on flood safety/hazard criteria, which generally establish thresholds for the water depth and flood velocity, or a relationship between them. The effects of the cross-section shape, roughness and slope of streets in meeting the criteria are evaluated based on equations, graphical results and one case study. An expedited method for the verification of safety criteria based solely on flow is presented, saving efforts in detailing models and increasing confidence in the results from simplified models. The method is valid for 0.1 m2/s 0.5 m2/s. The results showed that a street with a 1.8% slope, 75 m1/3s−1 and a rectangular cross-section complies with the threshold 0.3 m2/s for twice the flow of a street with the same width but with a conventional cross-section shape. The flow will be four times greater for a 15% street slope. The results also highlighted that the flood flows can vary significantly along the streets depending on the sewers’ roughness and the flow transfers between the major and minor systems, such that the effort detailing a street’s cross-section must be balanced with all of the other sources of uncertainty.

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