scholarly journals Low-density superhard materials: computational study of Li-inserted B-substituted closo-carboranes LiBC11 and Li2B2C10

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 52695-52699 ◽  
Author(s):  
Xiaolei Feng ◽  
Xinyu Zhang ◽  
Hanyu Liu ◽  
Xin Qu ◽  
Simon A. T. Redfern ◽  
...  
Keyword(s):  
Computational Study ◽  
Low Density ◽  
Superhard Materials ◽  
Carbon Cage

Insertion of Li atoms into a B-substituted carbon cage produces two superhard compounds with relatively low density: LiBC11 and Li2B2C10.

Fullerene-based low-density superhard materials with tunable bandgaps

2018 ◽  
Vol 701 ◽  
pp. 131-136 ◽  
Author(s):  
Ai-Hua Cao ◽  
Wen-Juan Zhao ◽  
Li-Hua Gan
Keyword(s):  
Low Density ◽  
Superhard Materials

A computational study of elongated pore interactions in a low density porous copper

1997 ◽  
Vol 230 (1-2) ◽  
pp. 14-24 ◽  
Author(s):  
Anthony Kee ◽  
Peter Matic ◽  
Jeffrey M. Wolla
Keyword(s):  
Computational Study ◽  
Low Density ◽  
Porous Copper

scholarly journals An Experimental and Computational Study of the High-Velocity Impact of Low-Density Aluminum Foam

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1949
Author(s):  
Matej Borovinšek ◽  
Matej Vesenjak ◽  
Kazuyuki Hokamoto ◽  
Zoran Ren
Keyword(s):  
Computer Simulations ◽  
High Velocity ◽  
Aluminum Foam ◽  
Computational Study ◽  
Rigid Wall ◽  
Low Density ◽  
High Velocity Impact ◽  
Foam Sample ◽  
Velocity Impact ◽  
The Impact

The study presents the results of an experimental and computational study of the high-velocity impact of low-density aluminum foam into a rigid wall. It is shown that the aluminum foam samples deformed before hitting the rigid wall because of the high inertial forces during the acceleration. During the impact, the samples deformed only in the region contacting the rigid wall due to the high impact velocity; the inertial effects dominated the deformation process. However, the engineering stress–strain relationship retains its typical plateau shape until the densification strain. The experimental tests were successfully reproduced with parametric computer simulations using the LS-DYNA explicit finite element code. A unique computational lattice-type model was used, which can reproduce the randomness of the irregular, open-cell structure of aluminum foams. Parametric computer simulations of twenty different aluminum foam sample models with randomly generated irregular lattice structures were carried out at different acceleration levels to obtain representative statistical results. The high strain-rate sensitivity of low-density aluminum foam was also observed. A comparison of experimental and computational results during aluminum foam sample impact shows very similar deformation behavior. The computational model correctly represents the real impact conditions of low-density aluminum foam and can be recommended for use in similar high-velocity impact investigations.

Regioselective CF2 functionalization of Sc3N@D3h(5)-C78

2022 ◽  
Author(s):  
Anastasia D. Pykhova ◽  
Olesya O. Semivrazhskaya ◽  
Nataliya A. Samoylova ◽  
Alexey A Popov ◽  
Ilya N. Ioffe ◽  
...  
Keyword(s):  
Computational Study ◽  
Chemical Properties ◽  
Carbon Cage

We report synthesis and computational study of Sc3N@C78(CF2) – an analog of the previously reported Sc3N@C80(CF2) with a less common carbon cage whose chemical properties presently remain far less studied....

Application of Improved Voltage Compensation in the SEM to Imaging of Organic Materials

1973 ◽  
Vol 31 ◽  
pp. 444-445
Author(s):  
P.J. Killingworth ◽  
M. Warren
Keyword(s):  
Electron Beam ◽  
Organic Materials ◽  
Operating Parameters ◽  
Low Density ◽  
Beam Diameter ◽  
Incident Electron Beam ◽  
Specimen Material ◽  
Voltage Compensation ◽  
Selection Of ◽  
Scanning Electron

Ultimate resolution in the scanning electron microscope is determined not only by the diameter of the incident electron beam, but by interaction of that beam with the specimen material. Generally, while minimum beam diameter diminishes with increasing voltage, due to the reduced effect of aberration component and magnetic interference, the excited volume within the sample increases with electron energy. Thus, for any given material and imaging signal, there is an optimum volt age to achieve best resolution.In the case of organic materials, which are in general of low density and electric ally non-conducting; and may in addition be susceptible to radiation and heat damage, the selection of correct operating parameters is extremely critical and is achiev ed by interative adjustment.

Quantitative defect studies in semiconductor TEM samples prepared by low angle ion milling

1995 ◽  
Vol 53 ◽  
pp. 512-513
Author(s):  
L. Mulestagno ◽  
J.C. Holzer ◽  
P. Fraundorf
Keyword(s):  
Sample Preparation ◽  
Milling Time ◽  
High Density ◽  
Low Density ◽  
Ion Milling ◽  
High Quality ◽  
Variable Angle ◽  
Major Disadvantage ◽  
Induced Defects

Due to the wealth of information, both analytical and structural that can be obtained from it TEM always has been a favorite tool for the analysis of process-induced defects in semiconductor wafers. The only major disadvantage has always been, that the volume under study in the TEM is relatively small, making it difficult to locate low density defects, and sample preparation is a somewhat lengthy procedure. This problem has been somewhat alleviated by the availability of efficient low angle milling.Using a PIPS® variable angle ion -mill, manufactured by Gatan, we have been consistently obtaining planar specimens with a high quality thin area in excess of 5 × 104 μm2 in about half an hour (milling time), which has made it possible to locate defects at lower densities, or, for defects of relatively high density, obtain information which is statistically more significant (table 1).

Intralysosomal Accumulation of Colloidal Gold-Low Density Lipoprotein Conjugates in Chloroquine-Treated Fibroblasts

1985 ◽  
Vol 43 ◽  
pp. 546-547 ◽  
Author(s):  
Dean A. Handley ◽  
Cynthia M. Arbeeny ◽  
Larry D. Witte
Keyword(s):  
Colloidal Gold ◽  
Cultured Cells ◽  
Low Density Lipoprotein ◽  
Density Lipoprotein ◽  
Coated Vesicle ◽  
Low Density ◽  
Cholesterol Esters ◽  
Cultured Fibroblasts ◽  
Surface Receptors ◽  
Ldl Particles

Low density lipoproteins (LDL) are the major cholesterol carrying particles in the blood. Using cultured cells, it has been shown that LDL particles interact with specific surface receptors and are internalized via a coated pit-coated vesicle pathway for lysosomal catabolism. This (Pathway has been visualized using LDL labeled to ferritin or colloidal gold. It is now recognized that certain lysomotropic agents, such as chloroquine, inhibit lysosomal enzymes that degrade protein and cholesterol esters. By interrupting cholesterol ester hydrolysis, chloroquine treatment results in lysosomal accumulation of cholesterol esters from internalized LDL. Using LDL conjugated to colloidal gold, we have examined the ultrastructural effects of chloroquine on lipoprotein uptake by normal cultured fibroblasts.

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