Results 71 to 80 of about 451,537 (323)

Multifunctional Design of Triply Periodic Minimal Surface Structures for Temporary Pediatric Fixation Devices

Advanced Engineering Materials, EarlyView.
A metallic implant's higher stiffness compared to the surrounding bone leads to stress shielding problems, causing bone density reduction and bone growth interference in pediatric patients. 3D‐printed triply periodic minimal surface structures present a promising engineering solution.
Ali Ebrahimzadeh Dehaghani, Zia Javanbakht, Martina Barzan, David G. Lloyd, Stefanie Feih   +4 more
wiley   +1 more source

Dual-porosity saturation model of low-porosity and low-permeability clastic reservoirs

Petroleum Exploration and Development, 2012
Abundant non-Archie phenomena have been discovered in rock electrical property experiments of low-porosity and low-permeability reservoirs, and the classical Archie model is not suitable for the oil saturation calculation in these reservoirs.
Xia LI, Wenzhi ZHAO, Cancan ZHOU, Tongshan WANG, Chaoliu LI   +4 more
doaj  

Local one-side porosity and pretangent spaces [PDF]

arXiv, 2015
For subsets of $\mathbb{R}^+$ we consider the local right upper porosity and the local right lower porosity as elements of a cluster set of all porosity numbers. The use of a scaling function $\mu:\mathbb{N} \to \mathbb{R}^+$ provides an extension of the concept of porosity numbers on subsets of $\mathbb{N}$.
arxiv  

The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components

Scientific Reports, 2017
Without post-manufacture HIPing the fatigue life of electron beam melting (EBM) additively manufactured parts is currently dominated by the presence of porosity, exhibiting large amounts of scatter.
S. Tammas-Williams, S. Tammas-Williams, P. Withers, I. Todd, P. Prangnell   +4 more
semanticscholar   +1 more source

Dislocation Distribution, Crystallographic Texture Evolution, and Plastic Inhomogeneity of Inconel 718 Fabricated by Laser Powder Bed Fusion

Advanced Engineering Materials, EarlyView.
Spatial distribution of microstructure in Inconel 718 3D‐printed with bidirectional strategy with no rotation and chessboard strategy is studied. The former results in a highly ordered arrangement of coarse grains separated by line clusters of dislocation‐dense fine grains. This arrangement is disrupted by the chessboard strategy.
Jalal Al‐Lami, Thibaut Dessolier, Samuel R. Rogers, Talha Pirzada, Minh‐Son Pham   +4 more
wiley   +1 more source

The Influence of Microstructure on Nanomechanical and Diffusion Barrier Properties of Thin PECVD SiOx Films Deposited on Parylene C Substrates

Frontiers in Materials, 2019
Plasma-enhanced chemical vapor deposition (PECVD) was used to deposit SiOx thin films of varying thicknesses on parylene C substrates, using hexamethyldisiloxane (HMDSO) as a precursor.
David Framil, Matthias Van Gompel, Florian Bourgeois, Ivo Furno, Yves Leterrier   +4 more
doaj   +1 more source

Microstructural evolution of amorphous self‐healing geopolymer composites containing alumina and glass frit

International Journal of Ceramic Engineering & Science, 2022
Geopolymer refers to a large group of nanoporous, nanoparticulate materials that are synthesized by dissolution and polycondensation of aluminosilicates in basic solutions and can be made from a variety of starting materials, such as industrial waste ash,
Patrick Keane, Rhys Jacob, Martin Belusko, Waltraud M. Kriven, Nikki Stanford, Frank Bruno   +5 more
doaj   +1 more source

Centrifugal Experiments with Simulated Regolith:Effects of Gravity, Size Distribution, and Particle Shape on Porosity [PDF]

Trans. JSASS Aerosp. Tech. Jpn., 14 (2016), Pk_17-Pk_21, 2017
Porosity is a key characteristic of the regolith on the surface of small bodies. The porosity of the regolith on the surface of asteroids is changed by applied pressure, and the relationship between pressure and porosity depends on the particle properties of the regolith. We performed compression measurements on samples of different materials, particle
arxiv  

Soft‐Layered Composites with Wrinkling‐Activated Multi‐Linear Elastic Behavior, Stress Mitigation, and Enhanced Strain Energy Storage

Advanced Engineering Materials, EarlyView.
In this study, exciting new bi‐/multi‐linear elastic behavior of soft elastic composites that accompany the activation of wrinkling in the embedded interfacial layers is analyzed. The new features and performance of these composite materials, including dramatic enhancements in energy storage, can be tailored by the concentration of interfacial layers ...
Narges Kaynia, Nicholas Xuanlai Fang, Mary C. Boyce   +2 more
wiley   +1 more source

Analytical 1-D dual-porosity equivalent solutions to 3-D discrete single-continuum models. Application to karstic spring hydrograph modelling [PDF]

Journal of Hydrology 262 (2002), 165-176, 2011
One dimensional analytical porosity-weighted solutions of the dual-porosity model are derived, providing insights on how to relate exchange and storage coefficients to the volumetric density of the high-permeability medium. It is shown that porosity-weighted storage and exchange coefficients are needed when handling highly heterogeneous systems - such ...
arxiv