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Online since: September 2016
Authors: N.S. Klochkov, Oleg M. Utyev, U.P. Egorov
There are currently a large number of alloys on aluminum, copper, iron, nickel and other bases which strength properties can be considerably increased by heat treatment.
By means of grinding skins with various sizes of abrasive grains metallographic specimen were prepared for research of a microstructure.
Considerable number of particles of a new phase is allocated in the structure after heating up to 500ºС and 2-hour holding.
Online since: August 2011
Authors: Li Ling Guo, Xing Li, Han Xing Liu
The effect of number of methylene, n, on the structure forming and the band gap magnitude has been studied.
The results demenstrate that the number of methylene has effect both on the forming of the layered structure and on the magnitude of the band gap.
When the number of the methylene, n is from Fig. 4 The images of the hybrids (C6H5CnH2nNH3)2PbI4, where (a) n=0,(b) n=1,(c) n=2. 0 to 1 and to 2, the crystal grains are from bar-shaped to blocks and to sheet-like.
So the difference of the interlayer distance should increase 2.415×2=4.830(Å) if the number of the methylene increase one.
The number of the methylene has obviously effect both on their layered structure forming and their values of the band gaps.
Online since: January 2011
Authors: A Fang Jin, Mamtimin Gheni, Zhi Chun Yang, Wen Tao Chen
According to the characteristic of wind-blown sand movement the sand grains phase and the gas phase are modeled by considering the different kernel function and the particles size, mass, density, velocity and other physical quantities, which can movement along with controlling equation.
Then the Eq. 2 can finally be written as (6) where N is the number of particles within the support domain of particle.
Some particles shows saltation movement resembled as parabola, as particles of number 1, 2, 4 and 6; and some particles shows suspending movement in a higher altitude than others, as particles of number 3 and 5, and some others moving on a horizontal line likes creeping movement on the ground surface, as particles of number 7.
Online since: April 2014
Authors: Takashi Kato
We define the psaturated value denoting the ratio of the number of carbon atoms with saturated sp3 hybrid orbitals to that of the total carbon atoms located in the area directly related to the superconductivity.
The psaturated value increases with an increase in the number of these additional materials combined with carbon framework.
Therefore, the HOMO-LUMO gap value increases with an increase in the number of these additional materials combined with carbon framework.
However, we can at least say that the psaturated value increases with an increase in the number of these additional materials (whatever they are) combined with carbon framework.
For example, the virgin diamond treated by water or exposed to the hydrogen plasma in a macroscopic sized grain, in which the valence bands are completely occupied by electrons, have a possibility to exhibit high-temperature superconductivity.
Online since: March 2013
Authors: Adam Barylski
The number of trajectory intersections with the disk radius, was summed in each of the analysed ranges.
The number of trajectory intersections with the disk radius, was summed in each of the analysed ranges.
Introducing abrasive grains of different numbers (size) intensifies the material removal but it also affects the quality of the lapped surface.
The probability of breaking the grains up increases with the increase in the micrograin size, under the constant load and abrasive particles concentration.
In order to ensure the one-layer distribution of the large number micrograins it is necessary to reduce the abrasive particles concentration on the active surface of the lap and in turn abrasive particles crushed under the higher unit pressure and the material removal rate decreases.
Online since: December 2009
Authors: Bijoy Mandal, Sujit Majumdar, Santanu Das, Simul Banerjee
Introduction Grinding can be described as a multitooth operation in which a number of abrasive grains held by a bonding material perform the cutting operation [1].
Some portion of this grinding energy is spent for chip formation, but most of the energy spent is consumed in sliding friction against dulled flattened abrasive grains and the work surface without removing any material.
Here the total number of treatment (N) is 8, number of central point (Cp) is 4 and number of variable (n) is 2.
Online since: January 2012
Authors: Bruno C. De Cooman, Ernst Kozeschnik, Seong Ho Han, Jae Hyuk Jung
In table 1, the number in the square brackets indicates the atomic N/Al ratio.
The average ferrite grain size was 5.2 ± 0.06 mm, and the influence of the composition and the isothermal hold temperature on the grain size was not pronounced Numerical analysis of the IF spectra.
In order to resolve the Snoek spectra of Fe-Mn-N alloys into a number of Debye relaxation peaks, a three-dimensional arrangement of the Mn substitutional atoms was taken into account.
In this notation the number indicates the number of Mn atoms in the octahedral unit.
Online since: May 2011
Authors: Kai Wang, Nan Nan Zhao, De Chao Wang, Yong Jie Yang
The energy of the acoustic emission events is relatively concentrative and the number of the acoustic emission events is less before and after the main damage; the acoustic emission events and their energy of limestone “break out” very suddenly and concentrative, almost no acoustic emission event occurs before and after
The number of acoustic emission events is still large and their energy rate is still higher at this time.
With further loading, coal gradually comes to the state of residual strength or deformation stage and the number of the acoustic emission events decreases gradually and their energy rate reduces gradually.
A large number of microscopic studies show that coal is a typical inhomogeneous material.
It consists of sand grains and fillings among the sand grains.
Online since: May 2020
Authors: Mikhail V. Tutov, Eduard Tokar', Marina Palamarchuk, Anna Matskevich, Andrei Egorin
Introduction Decontamination of spent ion-exchange resins (SIER) formed at the nuclear power plants (NPP) inevitably leads to using alkaline solutions to treat the surface and the bulk of resin’s grains to decompose the acid-insoluble silicates with the cesium ions being irreversibly bound by them [1, 2].
Cs-137 extraction from neutralized eluate was performed in dynamic conditions using a column filled with a TERMOXID-35 sorbent, which is a composite spherically-grained material based on nickel ferrocyanide applied onto hydrated zirconia (TERMOXID, Russia, TU 6200-305-123422660-98 (technical conditions)) [15].
%Sorption=(1-AiA0)×100 (1) %Desorption=1i(Vki×Aki)Ac×100 (2) where Ai – filtrate’s activity (Bq/mL), A0 – starting activity of the solution (Bq/mL), Aс – activity of RFR (Bq), Aк – activity of eluate (Bq/mL), Vk – eluate’s volume (mL), i – ordinal number of eluates fraction.
Cs-137 sorption efficiency from deactivating solution increases with the number of sorption cycles that is apparently related to gradual entering the operating mode by the resin.
Figure 5: Cs-137 uptake from alkaline solution in dynamic conditions; a – outlet sorption curves, b – outlet desorption curves, 1-6 – number of sorption cycle, С0 – starting activity of the solution (Bq/mL), С – filtrate’s activity (Bq/mL) Efficiency values of eluate’s decontamination after neutralization on TERMOXID-35 sorbent are given in Table 3.
Online since: May 2020
Authors: Evgeny E. Baryshev, Ksenya Yu. Shmakova, Gennady V. Tyagunov
Thermo-temporal treatment of the melt leads to a favorable structure formation, decrease in its chemical and physical heterogeneity, reduction in size and number of shrinkage defects.
Structural ordering of the fluid is characterized by quantitative parameters: r1 – the most likely shortest distance and z1 – the number of nearest neighbors, as well as cluster sizes – by the correlation radii.
On this basis, a number of heats were poured into molds with reduced profitable extensions, which made it possible to increase the suitable alloy of steel at the first conversion by 2-3% [20-21].
For example, advanced high-carbon steel ingots are characterized by increased dispersibility of the carbide phase, the austenite grain size decrease and reduction of area of columnar crystals.
Showing 18621 to 18630 of 28673 items