Investigation of one dimensional multi-layer periodic unit cell for structural base isolation

Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 2151-2163
Author(s):  
Saumitra Jain ◽  
Sumiran Pujari ◽  
Arghadeep Laskar
Keyword(s):  
Base Isolation ◽  
Unit Cell ◽  
One Dimensional ◽  
Structural Base ◽  
Periodic Unit Cell

Dispersion analysis of a reconfigurable unit cell in a one dimensional periodic architecture

2012 ◽  
Author(s):  
D. N. P Thalakotuna ◽  
L. Matekovits ◽  
Karu P. Esselle ◽  
Stuart Hay ◽  
Michael Heimlich
Keyword(s):  
Dispersion Analysis ◽  
Unit Cell ◽  
One Dimensional

One-dimensional DABCO hydrogen-bonding chain in a hexagonal channel of magnetic [Ni(dmit)2]

2020 ◽  
Vol 49 (46) ◽  
pp. 16772-16777
Author(s):  
Simin Li ◽  
Kiyonori Takahashi ◽  
Ichiro Hisaki ◽  
Kenta Kokado ◽  
Takayoshi Nakamura
Keyword(s):  
Hydrogen Bonding ◽  
Unit Cell ◽  
One Dimensional

(HDABCO+)9(DABCO)[Ni(dmit)2]9·6CH3CN had a hexapetal flower-like pattern of [Ni(dmit)2]−. The [Ni(dmit)2]− hexamers formed trimer units and stacked one-dimensionally including DABCO-CH3CN chain at the centre more than 150 Å long per unit cell.

scholarly journals Heat and Mass Transfer during Hydrogen Generation in an Array of Fuel Bars of a BWR Using a Periodic Unit Cell

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
H. Romero-Paredes ◽  
F. J. Valdés-Parada ◽  
G. Espinosa-Paredes
Keyword(s):  
Mass Transfer ◽  
Numerical Analysis ◽  
Fuel Element ◽  
Numerical Simulations ◽  
Heat And Mass Transfer ◽  
Nuclear Reactor ◽  
Hydrogen Generation ◽  
Unit Cell ◽  
Concentration Profiles ◽  
Periodic Unit Cell

This paper presents, the numerical analysis of heat and mass transfer during hydrogen generation in an array of fuel cylinder bars, each coated with a cladding and a steam current flowing outside the cylinders. The analysis considers the fuel element without mitigation effects. The system consists of a representative periodic unit cell where the initial and boundary-value problems for heat and mass transfer were solved. In this unit cell, we considered that a fuel element is coated by a cladding with steam surrounding it as a coolant. The numerical simulations allow describing the evolution of the temperature and concentration profiles inside the nuclear reactor and could be used as a basis for hybrid upscaling simulations.

Structure and Properties of Ultrathin Ge-Si Superlattices

1986 ◽  
Vol 67 ◽  
Author(s):  
J. Bevk ◽  
J. P. Mannaerts ◽  
L. C. Feldman ◽  
B. A. Davidson ◽  
W. P. Lowe ◽  
...  
Keyword(s):  
Optical Transition ◽  
Growth Direction ◽  
Unit Cell ◽  
Silicon Substrates ◽  
Optical Studies ◽  
One Dimensional ◽  
X Ray ◽  
Ordered Alloys ◽  
Diffraction Patterns ◽  
Highly Strained

ABSTRACTWe report the synthesis, structural characterization, and preliminary optical studies of ultrathin Ge-Si superlattices with individual sublayers smaller than the Si unit cell, grown by MBE on (001) silicon substrates. Structures are fabricated one monolayer at a time in a configuration GeGeSiSiGeGe..., resulting in either ordered alloys or complex cell superlattices. Rutherford backscattering and channeling experiments on these highly strained heterostructures indicate excellent crystallinity with tetragonal distortion as high as 3.5%. Electron diffraction patterns exhibit characteristic superlattice reflections indicative of one-dimensional layering with periodicity of four monolayers. X-ray scans along the growth direction at the (002) position in reciprocal space reveal a strong peak not observed in random GeSi alloys. This scattering is attributed indirectly to the GeSi ordered phase. The optical transition energies measured by Schottky barrier electroreflectance correspond to those expected from homogeneous alloys of the same composition; however, the width of optical transitions is less than 30 meV at room temperature, allowing a clear resolution of the splitting of the valence band by strain. Modification of the unit cell of the diamond lattice in this way should permit the design of materials with novel opto-electronic characteristics. Preliminary Raman and photoconductivity measurements are also reported.

Novel Polyanionic Topologies in Ag2VAsO6 and Ag6V2As2O13

2013 ◽  
Vol 68 (5-6) ◽  
pp. 611-615 ◽  
Author(s):  
Jürgen Nuss ◽  
Jan Curda ◽  
Martin Jansen
Keyword(s):  
Stainless Steel ◽  
Oxygen Pressure ◽  
Unit Cell ◽  
Two Dimensional ◽  
Unit Cell Parameters ◽  
Space Group ◽  
One Dimensional ◽  
Cell Parameters ◽  
High Oxygen Pressure ◽  
Silver Cations

Two new silver vanadate arsenates, Ag2VAsO6 and Ag6V2As2O13, have been prepared applying high oxygen pressure syntheses in stainless-steel autoclaves. Ag2VAsO6 crystallizes in space group P1 with unit cell parameters a=639.1(1), b=646.1(1), c=706.6(1) pm, α =116.105(3), ß =91.759(4), γ = 90:067(4)°, and Z =2 (R1 =0.058, 3935 independent reflections). The structure consists of AsO4 tetrahedra and VO6 octahedra which are linked to form two-dimensional 2¥[VAsO6]2- polyanions, separated by silver cations. Ag6V2As2O13 (C2=c, a=1895.9(2), b=536.40(6), c=1308:5(2) pm, ß =113:578(2)°, Z =4; R1 =0.030, 2571 independent reflections) displays as primary building units AsO4 tetrahedra and VO5 trigonal bipyramids which are condensed by sharing edges to one-dimensional 1¥[V2As2O13]6- ladder-like strands, set apart by the silver cations. These heteropolyanions are without precedent

Electron–phonon interaction in three-, two- and one-dimensional ternary mixed crystals

2016 ◽  
Vol 30 (15) ◽  
pp. 1650182
Author(s):  
Junhua Hou ◽  
Yunpeng Fan
Keyword(s):  
Cell Volume ◽  
Effective Mass ◽  
Unit Cell Volume ◽  
Three Dimensional ◽  
Unit Cell ◽  
Mixed Crystals ◽  
Phonon Interaction ◽  
One Dimensional ◽  
Electron Phonon Interaction ◽  
Self Trapping

The electron–phonon (e–p) interaction in three-dimensional (3D), two-dimensional (2D) and one-dimensional (1D) ternary mixed crystals is studied. The e–p interaction Hamiltonians including the unit cell volume variation in ternary mixed crystals are obtained by using the modified random-element-isodisplacement model and Born–Huang method. The polaronic self-trapping energy and renormalized effective mass of GaAs[Formula: see text]Sb[Formula: see text], GaP[Formula: see text]As[Formula: see text] and GaP[Formula: see text]Sb[Formula: see text] compounds are numerically calculated. It is confirmed theoretically that the nonlinear variation of the self-trapping energy and effective mass with the composition is essential and the unit cell volume effects cannot be neglected except the weak e–p coupling. The dimensional effect cannot also be ignored.

Effect of Strain Hardening on Monotonic and Cyclic Loading Behavior of Plate-Fin Structures with Two Pore Pressures

2014 ◽  
Vol 626 ◽  
pp. 133-138
Author(s):  
Shuhei Banno ◽  
Dai Okumura ◽  
Nobutada Ohno
Keyword(s):  
Cyclic Loading ◽  
Strain Hardening ◽  
Pore Pressure ◽  
Kinematic Hardening ◽  
Unit Cell ◽  
Viscoplastic Material ◽  
Ratcheting Strain ◽  
Pore Pressures ◽  
Special Cases ◽  
Periodic Unit Cell

We perform finite element homogenization (FEH) analysis to investigate the effect of strain hardening on the monotonic and cyclic loading behavior of plate-fin structures with two pore pressures. As a typical base metal of plate-fin structures, 316 stainless steel is considered and assumed to be the viscoplastic material that obeys the Ohno-Wang kinematic hardening rule. The plate-fin structures are assumed to be periodic and subjected to uniaxial monotonic and cyclic loadings in the stacking direction. A periodic unit cell is used for FEH analysis. Results are compared with those based on three special cases derived from Hill’s macrohomogeneity equation. It is found that the mean pore pressure entirely affect the homogenized viscoplastic behavior. It is further found that the differential pore pressure causes the remarkable accumulation of ratcheting strain in the periodic unit cell, although this internal ratcheting gives no effect on macroscopic relations, resulting in providing a closed hysteresis loop for the plate-fin structures.

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