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Online since: November 2012
Authors: Daniel Fruchart, N.E. Skryabina, Vladimir M. Pinyugzhanin
Systematic analysis of many experimental data led to question chemical, physical, mechanical parameters contributing significantly to improve the kinetics of absorption/desorption.
Besides, results of theoretical and numerical computation enlighten the impact of structural and mechanical parameters owing to the local bonds of Mg/MgH2 with of TM elements, in terms of total energy and electronic structure.
Pressure-composition-isotherms (PCI) traces as shown on Fig. 1a contain fundamentals of the thermodynamic properties of a metal hydrogen system according the analysis in terms of van’t Hoff plots as represented on Fig. 1b, where the mid-plateau pressure P is related to the atmospheric one, DH and DS are respectively the entropy and enthalpy changes at hydrogenation/ dehydrogenation (H/D), R and T are the gas constant and the absolute temperature, respectively.
In the previous approach the local crystal structure was affected only accounting for local modifications on atom species (substitution, vacancy), here we have considered potential extended modifications of structure.
However, it is pointed out here that the direct interface modifications of TM and Mg atoms should be one of most important factor to consider with a chemical effect in stabilizing better local structure that favors hydrogen diffusion.
Online since: November 2017
Authors: Juan Rubio, Aitana Tamayo, M. Alejandra Mazo, Javier Sanguino
Their high aspect ratio and excellent mechanical, thermal and electrical properties could potentially provide new materials with improved mechanical resistance and/or additional electrical and thermal features [2-4].
So far, the properties of the CNTs-CNFs/ceramic composites currently fall short of predictions.
The need for a relatively high processing temperature was one of the causes of the limited mechanical properties of the composites obtained.
Oteo, Processing and properties of carbon nanofibers reinforced epoxy powder composites, J.
Part II: microstructure and mechanical properties of the hot-pressed composites, J.
Online since: September 2012
Authors: Yoshinori Kobayashi
The hole size deduced from the pick-off annihilation lifetime using Eq. 10 is well correlated with the molecular packing, which plays important roles in phase transitions, transport phenomena, mechanical properties etc.
Jean, Application of positron annihilation to study the surface properties of porous resins, J.
Petzinger, Does quantum mechanical tunneling affect the validity of hole volume distributions obtained from positron annihilation lifetime measurements?
Ito, Correlation between positron annihilation and gas diffusion properties of a series of polyimides, Bull.
Faupel, Free volume and transport properties in highly selective polymer membranes, Macromolecules 35 (2002) 2071-2077
Online since: November 2008
Authors: V.M. Nadutov, Valentin A. Tatarenko, Taras M. Radchenko, Yong Bum Park, S.M. Bokoch
Nevertheless, in any case, the strain-induced interaction of impurity atoms must be taken into account for analysis of structure and properties of f.c.c.
The interatomic-interaction energies are also necessary for calculations of the phase equilibria and phase diagrams, crystallophysical and mechanical properties of alloys [1-4].
It means that the straininduced interaction can solely not describe the thermodynamic properties of austenite.
Therefore, values of Lande's factors [59], gα, for both constituents (α = Ni, Fe) not strongly differ from 'spin value': g = 2.
Firstly, because of temperature- and concentration-dependent statistical-thermodynamic factors of correlated diffusion of the interacting atoms.
Online since: October 2011
Authors: Jing Yong Liu, Zuo Yi Yang, Yu Tian, Jian Bo Zhou, Xu Nan Ning, Lei Li
Single-factor experiment Lime experiment.
b) The compressive strength of the solidified blocks increased when the content of lime and cinder increased, which showed that the addition of lime and cinder was beneficial to improve the mechanical properties of solidified blocks.
Online since: April 2005
Authors: Yves Limoge, Alain Barbu
The equilibrium properties are for example frequently less well known than in metallic alloys.
Primary radiation effects and defect production Contrarily to metallic systems, in oxides both elastic and inelastic interactions can have an impact upon the defect population, creating point defects or affecting their mobility.
Ref a [4], b [5], c [6], d [7], e [8], f [9, 10] As can be seen in this table the values given for a single oxide display a very large spread, frequently by a factor up to two.
a [11 ], b [12], c [13], d [14] obtained using potential fitted on the thresholds themselves, but then the transferability to other properties is not granted.
If defect creation is an important part of the inelastic energy transfer, electronic excitations in non metals are known for a while to deeply affect defect mobility also, generally enhancing it [36].
Online since: July 2021
Authors: Cheng Yu Ye, Zhao Ye Wang
Superconductors are the materials with physical properties where electrical resistance vanishes and magnetic flux fields are expelled from the materials.[3-6] In the context of a normal conductor, the current flow is considered to be the flow of electrons moving across a heavy ionic lattice.
The superconducting properties of the first unconventional superconductor, CeCu2Si2, were reported in 1979 by Steglich.[9] Then, in 1987 Bednorz and Müller discovered that the cuprate perovskite material LaBaCuO4 develops superconductivity at a critical temperature of approximately 35K, which is far above the highest critical temperature known at that time.
The superconductors lose their superconductivity once one of the three factors goes beyond the critical value.
The magnet design must also consider several other aspects such as superconducting wire performance, operational reliability, magnet protection, sufficient mechanical strength, low-temperature technology and cooling methods.
The cryogenic system is necessary to ensure that the superconducting magnet is at low temperature, but its cooling effect directly affects the technical performance of the superconducting magnet, such as thermal stability.
Online since: May 2019
Authors: Zynovii Malanchuk, Pavlo Saik, Mykhailo Petlovanyi, Kateryna Sai, Vasyl Lozynskyi
A statistical model for the description of the properties of clathrate compounds of hydroquinone was created by Van der Waals.
Approximate values of these properties can be obtained by computational methods.
So, the processes of phase changes in the solid phases are difficult at high loads by the action of factors resulting from these loads.
One of the main factors of the thermodynamic study of phase transformations involving the voids formation is the fact that the energy of their relaxation is always positive and can be determined by a calorimetric method.
The influence of fine particles of binding materials on the strength properties of hardening backfill.
Online since: October 2019
Authors: Sasithorn Kongruang, Supatsara Rujanant, Woo Kul Lee
The tissue engineering goal is to create biomaterials possessing optimum structural and mechanical properties similar to bone tissue.
Furthermore, differences in the molecular weight, degree of branching, triple helical conformation and solubility may affect the binding affinity of BG to each receptor [26].
Lim, Dietary β-glucan regulates the levels of inflammatory factors, inflammatory cytokines, and immunoglobulins in interleukin-10 knockout mice, J.
Gani, Structural, thermal, functional, antioxidant & antimicrobial properties of β-D-glucan extracted from baker’s yeast (Saccharomyces cerevisiae)—Effect of β-irradiation, Carbohydr.
Online since: March 2024
Authors: Zoe Mellick, Alice Payne
It is essential to understand the different types of cotton as they affect the fibre’s staple length, quality, price, and market destination.
The price of cotton is determined by a volatile global marketplace, influenced by factors such as market forces and government subsidies.
However, social factors such as the impact on farmers and their income security are not taken into account in LCAs.
Chain of custody models have been developed to promote transparency and trust in the movement of materials and their properties, such as origin and production practices.
Mechanical recycling involves shredding fabrics, but the resulting fibre is often weaker and needs to be blended with virgin cotton to create new products.
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