scholarly journals An experimental study of the behaviour of two rockfills accounting for the effects of degree of saturation

2020 ◽  
Vol 195 ◽  
pp. 03033
Author(s):  
Roberta Ventini ◽  
Alessandro Flora ◽  
Stefania Lirer ◽  
Claudio Mancuso ◽  
Antonio Cammarota
Keyword(s):  
Mechanical Characterization ◽  
Degree Of Saturation ◽  
Size Distributions ◽  
Factors Affecting ◽  
Grain Crushing ◽  
Grain Size Distributions ◽  
Oedometer Tests

Rockfill dams have become more and more recognized for their safety, economy and adaptability to widely varying site conditions. As a contribution to the understanding of the main factors affecting the rockfill behaviour, the paper reports and discusses experimental data on several aspects relevant to the interpretation and analysis of their in-situ response. The experimental programme involved three series of oedometric tests on specimens of two different gravels having the same grading, reconstituted at the same initial relative density. Experimental observations on rockfills compressibility are presented and discussed: attention is paid to the role of degree of saturation (Sr) through the analysis of “driest”, “fully saturated” conditions, and the transition from one to the other. Grain crushing tests on dry and saturated soil particles are also reported. Grain size distributions of the specimens, both after compaction and after the oedometer tests, are compared in the paper. The results show that the effect of Sr cannot be overlooked in the mechanical characterization of the material, especially in rockfill/stress conditions prone to crushing

Spectro-mechanical Characterization of Aromaticity and Maturity of Kerogens in Oil Shale at 6 nm Spatial Resolution

2018 ◽  
Author(s):  
Devon Jakob ◽  
Le Wang ◽  
Haomin Wang ◽  
Xiaoji Xu
Keyword(s):  
Spatial Resolution ◽  
Oil Shale ◽  
Infrared Imaging ◽  
Mechanical Characterization ◽  
Optical Diffraction ◽  
Chemical Compositions ◽  
Valuable Insight ◽  
Eagle Ford Shale

<p>In situ measurements of the chemical compositions and mechanical properties of kerogen help understand the formation, transformation, and utilization of organic matter in the oil shale at the nanoscale. However, the optical diffraction limit prevents attainment of nanoscale resolution using conventional spectroscopy and microscopy. Here, we utilize peak force infrared (PFIR) microscopy for multimodal characterization of kerogen in oil shale. The PFIR provides correlative infrared imaging, mechanical mapping, and broadband infrared spectroscopy capability with 6 nm spatial resolution. We observed nanoscale heterogeneity in the chemical composition, aromaticity, and maturity of the kerogens from oil shales from Eagle Ford shale play in Texas. The kerogen aromaticity positively correlates with the local mechanical moduli of the surrounding inorganic matrix, manifesting the Le Chatelier’s principle. In situ spectro-mechanical characterization of oil shale will yield valuable insight for geochemical and geomechanical modeling on the origin and transformation of kerogen in the oil shale.</p>

scholarly journals Role of annealing temperature on the sol–gel synthesis of VO2 nanowires with in situ characterization of their metal–insulator transition

RSC Advances ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 5158-5165 ◽  
Author(s):  
Y.-R. Jo ◽  
S.-H. Myeong ◽  
B.-J. Kim
Keyword(s):  
Sol Gel ◽  
Insulator Transition ◽  
In Situ Characterization ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Nanowire Device ◽  
Sol Gel Synthesis

The single-VO2 nanowire device synthesized via sequential morphological evolutions with oxygen reduction during annealing features a sharp metal-insulator transition.

Biological, thermal and mechanical characterization of modified glass ionomer cements: The role of nanohydroxyapatite, ciprofloxacin and zinc l-carnosine

2019 ◽  
Vol 94 ◽  
pp. 76-85 ◽  
Author(s):  
Stefano Pagano ◽  
Manila Chieruzzi ◽  
Stefania Balloni ◽  
Guido Lombardo ◽  
Luigi Torre ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Glass Ionomer Cements ◽  
Glass Ionomer

Microstructural and Mechanical Characterization of Catalyst Coated Membranes Subjected to In Situ Hygrothermal Fatigue

2015 ◽  
Vol 162 (14) ◽  
pp. F1461-F1469 ◽  
Author(s):  
Alireza Sadeghi Alavijeh ◽  
Ramin M.H. Khorasany ◽  
Zachary Nunn ◽  
Aronne Habisch ◽  
Michael Lauritzen ◽  
...  
Keyword(s):  
Mechanical Characterization ◽  
Coated Membranes

scholarly journals Correction: Role of annealing temperature on the sol–gel synthesis of VO2 nanowires with in situ characterization of their metal–insulator transition

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 31984-31984
Author(s):  
Y.-R. Jo ◽  
S.-H. Myeong ◽  
B.-J. Kim
Keyword(s):  
Annealing Temperature ◽  
Sol Gel ◽  
Insulator Transition ◽  
In Situ Characterization ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Sol Gel Synthesis

Correction for ‘Role of annealing temperature on the sol–gel synthesis of VO2 nanowires with in situ characterization of their metal–insulator transition’ by Y.-R. Jo et al., RSC Adv., 2018, 8, 5158–5165.

Mechanical Characterization of Polymer Nanowires Using MEMS

2006 ◽  
Author(s):  
B. A. Samuel ◽  
Bo Yi ◽  
R. Rajagopalan ◽  
H. C. Foley ◽  
M. A. Haque
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Furfuryl Alcohol ◽  
Mechanical Characterization ◽  
Uniaxial Tensile ◽  
Testing Device ◽  
Uniaxial Tensile Testing ◽  
Polymer Nanowires

We present results on the mechanical properties of single freestanding poly-furfuryl alcohol (PFA) nanowires (aspect ratio &gt; 50, diameters 100–300 nm) from experiments conducted using a MEMS-based uniaxial tensile testing device in-situ inside the SEM. The specimens tested were pyrolyzed PFA nanowires (pyrolyzed at 800° C).

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