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Online since: May 2004
Authors: M. Davidović, P. Tomić, S. Batinić
On the other hand, there are an increasing number of studies which use synchrotron radiation sources, whose high intensity allow in-situ measurements to follow structural evolutions in real time.
Father annealing causes a resistance drop to a minimum at 1.7 A, while XRD spectra show the nucleation and growth of � Fe nanocrystals, with grain sizes of about 10 nm, and increasing crystalline volume fraction in this current range.
A similar behavior was observed for the Fe-B-Si-Ni-Mo alloy, with the beginning of structural ordering shifted to a higher current value (1.4 A), and the formation of larger �-Fe grains, about 40 nm in size.
Online since: June 2019
Authors: Zhi Qiang Cao, Hui Liang, Bing Yang Gao, Ya Ning Li, Qiu Xin Nie
Introduction High entropy alloys (HEAs), contain a variety of major elements, whose number is generally greater than 5, and the mole fraction is between 5% and 35% [1].
However, the laser cladding method has the advantages of high cooling velocity, low heat affected zone and fine grain of coatings, whose thickness can reach to a millimeter [11].
W has a higher melting point, its addition can lead to a decline in unit specific energy, then the degree of subcooling reduces during solidification, the growth rate of grains becomes slower, which lead to the increase of the dendrite size of W0.5 coating.
Online since: August 2019
Authors: Mashuri Mashuri, Umi Nuraini, Yhuanita Nurul Kaukaba, Suasmoro Suasmoro
The microstructure results confirmed that Y3+ improves densification and causes reduction of grain growth.
When the temperature rises, the number of thermal electrons and their Schöttky defects will increase indicating by an increase in the conductivity values.
The defectives in perovskite structures include ‘lattice dipole’, ‘defect dipole’, and ‘grain dipole’, which influence co-existence of ‘tail curve’.
Online since: March 2007
Authors: Da Li Mao, Si Xin Zhao, Wei Wang
Introduction There are several schools of thought about bainite transformation. 1) Diffusional: The bainitic ferrite nucleates at parent austenite grain boundary.
Under the assumption that the shape of the advancing interface is parabolic cylinder, the growth rates of a platelike precipitate can be approached by[8]: ( ) ( ) 0.5 0.5 0 1 0 2 1 ( ) 1 p c p e erfc p S v x x S γα π µ ρ ρ = Ω + − + (2) where p is the peclet number and equals to 2Cv D γ ρ in which ρ is the radius of advancing fronts, 0µ is the interfacial kinetic coefficient, 1S and 2S are functions of p and xγα is the carbon concentration at flat interface.
The concentration fields of new grain interact with each other at the late stage of proeutectoid ferrite transformation.
Online since: July 2012
Authors: Yu Ming Dong, Yi Qiu Tan
The use of crumb rubber modifiers with asphalt binders seems to enhance the fatigue resistance, as illustrated in a number of studies [5, 6, 7, 8].
Considering rubber grains distributed in CRM binder, the two mixtures are different from the passing percent of 4.75mm sieve size.
The rubber grain can be a fine aggregate in the CRM mixture.
Online since: June 2012
Authors: G.Q. Tan, Ao Xia, Li Hua Song, Wei Zhang, Hui Jun Ren
When NaOH concentration was over 0.6 mol/L, all the diffraction peaks and the Card Number PDF24-1224 were in accordance with the hexagonal phase Y(OH)3.
In the growing course of Y(OH)3, first, the Y(NO3)3 molecules were dissolved and hydrated, and the hexagonal phase Y(OH)3 crystal grains were obtained.
And as the alkali concentration was increased, the radial size of crystal grains turned larger and larger.
Online since: September 2003
Authors: Yu.A. Vodakov, M.S. Ramm, A.D. Roenkov, A.S. Segal, E.N. Mokhov, S.Yu. Karpov, Heikki Helava, Yu.A. Makarov
These crystals exhibited a domain structure with the single-crystal grains exceeding 10 mm in dimension and the dislocation density locally less than ~104 cm-2.
Without the buffer, individual hexagonal sub-grains appeared on the surface resulting in the crystal quality degradation.
Journal Title and Volume Number (to be inserted by the publisher) 3 distribution in the powder (referred to in Fig. 4 as optimal conditions) is favorable for stable long-term source operation.
Online since: July 2014
Authors: Zhi Feng Wang, Hai Bo Zhang, Yuan Fu Zhang, Chen Lin Hu
Influenced by tectonic background and global sea level rise, a set of deep water - fine grained sediments, mainly consisted of siliceous shales, cherts, carbonate rocks,are deposited during the formation of Wufeng formation in Late Ordovician[12].Early Silurian Longmaxi formation is mainly black shale deposited in deep water shelf environment.
Fine outcrops and some drillings provides a number of basic data in this study.
The organic matters type of Longmaxi shale Prospects of Shale Gas Exploration Longmaxi Formation shale is a set of siliceous clastic fine grained sediment, depositing in the deep-water shelf environment, it is the product of transgressive systems tracts,the stable deep-water sedimentary environment makes Longmaxi Formation shale’s thickness larger, plane distribution is stable, the thickness of the black shale is about 20-120 meters.
Online since: November 2014
Authors: Elena Mavropoulos, Andrea Machado Costa, Moema Hausen, Marcelo N. Tanaka, Jessica Dornelas, Ana Paula Moreira Duarte, Gloria A. Soares, Marcia S. Sader, Alexandre Rossi
Table 1: Estimative measurements by UV-Vis of HI adsorbed on β-TCP sintered powder Initial insulin concentration (mg.mL-1) Insulin mg/g on β-TCP 0.5 Bellow detection 1.0 Bellow detection 1.5 14.0 ± 2.0 2.0 9.7 ± 2.0 The SEM micrograph (Fig. 3a) showed a dense structure and AFM 3D image of sintered grains (Fig. 3b) presented a homogenous discs surface.
a b Figure 3: SEM micrograph (a) and AFM 3D image of sintered grains (b) of β-TCP disc surface The surface wettability is important parameters which affect the biological response to an implanted material [2].
Additionally, total cell number was quite higher on β-TCP-PB as compared to β-TCP-HI.
Online since: April 2015
Authors: E.M. Vodopyanov, Anna V. Loginova, N.V. Martyushev, Aleksander S. Ivashutenko
A certain ceramics density decline sintered at 1750°С is specified by the concentration grade growing of dioxide zirconium monoclinic phase due to the recrystallization growth of grains.
Ceramics and Titanium cermet density at different sintering temperatures Number Sample Density*, [gr/cm3] 1550 °С 1600 °С 1650 °С 1700 °С 1750 °С 1 CZC 4.03 4.80 4.81 4.94 4.84 2 OC-1,25 4.72 4.72 4.69 4.55 samples melted 3 OC-2,5 4.67 4.64 4.37 3.85 *For studied compositions the ceramics theoretical density equals 5.03 gr/cm3.
Therefore, the recrystallization growth of grains must be significantly decelerated in the issue of sintering activation energy reduction and a low motion speed of phase boundaries.
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