Search Options

Sort by:

Publication Type:

Open access:

Publication Date:

Periodicals:

Search results

Online since: March 2013
Authors: Paramasivam Manisankar, Raman Sasikumar
The grain size of the copolymer was measured using XRD studies and was found to be 70 nm.
The peak current increased with increase in the number of cycles, which may due to the autocatalytic polymerization, which causes quick poly (OA) film as the electrolysis proceeds [9,10].
Online since: February 2013
Authors: Liang Li, Jun Wang, Xing Ping Fan
The results are found: there are a few of Ti (C, N) presented in the carbonitriding reaction production with theoretical amount of carbon at 1400℃; the content of Ti (C, N) increases with temperature; the carbonitriding reaction tends to finish at 1500℃; the average size of Ti(C,N) particles are 7.8452μm and the maximum is 21μm above 1600℃; the content of N in the Ti (C, N) decrease with temperature below 1400℃ and that of N increase and the change of C content is opposite above 1400℃; To increase appropriately carbon amount can promoto the carbonitride reaction which is benefit for the formation and grow of the Ti (C, N); when the amount of carbon beyond the theoretical value, the maximum and average size of grains obtained is smaller.
It shows that the bigger Ti(C,N) grains can be obtained and the high temperature is very important for the carbonitride treatment of the deep reduced slag to obtain Ti (C, N).
There is almost no melting phase in the sample and the main reaction may be solid-solid or solid-gas and the reaction not complete and a large number of free carbon residue in the product combining with Ti (C, N) into solid solution and so the ratio of C/N increase with temperature below 1400˚C.
Online since: March 2013
Authors: Zenon Ignaszak, Paweł Popielarski, Jakub Hajkowski
The listing data suggests the necessity of a large number of parameters.
n –number of crystallization nuclei calculated for surface or volume unit, 1/m2 or 1/m3, DT – calculated local undercooling (from F-K model), [K] The parameters of above empirical equation (soft modeling): DTm-(i) – average undercooling corresponding to the maximum nucleation intensity, i=s (surface nucleation on casting-mould interface) or i=v (volume nucleation), 5,5 [K] DTσ – standard deviation, 0,5 [K] nmax – theoretical maximal nucleation density which can be reached when whole nucleation sites will be activated during cooling (nmax is determined experimentally for the given alloy), 2e10 [1/m3] The empirical grow model υ=f(t) (e.g.
Then the next stage of validation is presented, Principal chosen parameters governing the heat transfer, nucleation and growth phenomena: Hcast-insul (heat transf.coeff.)=10000 W/m2K Hcast-chilll (heat transf.coeff.)=2500 W/m2K 1 - Empirical nucleation model – nucleation distribution (Gauss distrib.), table 1 ΔTm-s(mean surf.undercooling) = 5K and ΔTm-s-Ch-HI=10 ns (max nuclei surf.number) = 1e5 1/m2 and ns-Ch = 8e5 ΔTm-v (mean volume undercooling)=2K nv (max nuclei volume number)=8e6 1/m3 σΔT=0,4 K 2 – Empirical dendrite growth model (Kurz-Giovanola-Trivedi), table 1] a2 (growth coeff.) =2,9e-3 mm/(sK-2) a3 (growth coeff.) =1e-9 mm/(sK-3) Oriented columnar structure Dendrite Arm Spacing (DAS) = 15 to25 μm (CET=Columnar Equiaxed )transition) 10mm 100μm CET experim= 62±6 CET simulat = 61±3 Cu – chill diam. 70 mm Cu – chill diam. 70 mm High insulating material High insulating material a.
Thevoz, A Three-Dimensional Cellular Automaton-Finite Element Model for the Prediction of Solidification Grain Structures, Metallurgical and Materials Transactions A, 1999, vol. 30A, pp. 3153-3165
-A., Rappaz M., A Coupled Finite ElementCellular Automaton Model for the Prediction of Dendritic Grain Structures in Solidification Processes, Acta Metall.
Online since: September 2013
Authors: Hui Qi Zhang, Min Li, Zhi Gui Lin, Lin Li, Fang Qin Yao
The number of adjacent anchor nodes is less than 3.
The number of adjacent anchor nodes is less than 3.
Assume that the number of simulations is 1000.
Finally, the AHMH-APIT algorithm is tested in the case of the number of anchor nodes, the number of nodes and communication radius.
References [1] Savvides A, Han.C.C, Srivastava M.B: Dynamic fine-grained localization in ad-hoc networks of sensors.
Online since: May 2006
Authors: A. Szytuła
The neutron scattering power of a given element is not simply related to atomic number but has about the same magnitude throughout the periodic table.
Scattering lengths for neutrons (b) and X-ray (f0) for sinθ/λ equal 0 and 0.5 Å -1 versus the atomic number Z.
The basis of this method has been reviewed in a number of textbooks and articles, like the classical text book [16] as well as later works [17-19].
Using Eq. 32 the size of grain and the deformation of the crystal and magnetic unit cell were determined (see Fig. 14 and Table 6).
Increasing temperature leads also to an increase in the magnitude of grains Dhkl as well as in the value of magnetic moments, but deformation of the magnetic unit cell decreases.
Online since: January 2017
Authors: Hui Ying Chen, Xuan Xing, Xin Yu Zhuang, Hong Yu Li, Li Mei Ai, Yi Hu Wang, Qian Wang, Yi Nan Li, Jian Xin Xia
From the figure 4 (a) and (a') can be observed that corroded hole is obvious on the Ti plate surface, the number of holes per unit area is sparse, and the arrangement is not closely.
The number of holes was increased furtherly in Figure 4 (c) and (c'), some holes even connected as a whole, so that the surface has a flake off.
When the the electrolysis time is longer, the number of holes on the surface of the Ti plate is larger, which even leads to the loss of the surface of the electrode.
It shows that the electrode surface is compact and smooth, and grain distribution is uniform and dense, with good morphology.
Through La doping elements, the crystal type of electrode has been improved, makes the grain fine density.
Online since: September 2017
Authors: S.A. Kotov, L.B. Gushchina, M.G. Livintsova
The number of the oxides decreases at the same time.
It allows us to regulate easily the phase formation of materials at the atomic as well as at the molecular levels, distribution and composition of phases, and the grain size.
A large number of factors influence the combustion process and reactions passing, such as properties of the initial powder components, the initial temperature of the mixture, heat transfer etc.
According to the results of X-ray phase analysis it was found that the upper part of the sample consists of the next basis – titanium nickelide, Na2O2 and the traces of Na4TiO4; the middle part is based on titanium nickelide, the traces of Na2O2 and NaO3; the lower part basically consists of titanium nickelide (in a smaller amount than in the top part), some number of Na4TiO4 and the traces of NaОз.
Online since: April 2012
Authors: Joong Kee Lee, Arenst Andreas Arie
One can see that the bare Si film shows a smaller grain size compared to that of the carbon layer on the C60 coated Si sample.
It is thought that the smaller grains can cause the silicon film to be denser and smoother, which may limit the lithium ion diffusion in the bare Si film.
For the semi-infinite diffusion conditions, the peak current is proportional to the square root of the scan rate which is stated by the Randles-Sevcik equation [12, 13]: (1) whereis the peak current (A), is the number of electrons per species reaction (1 for Li+), is the electrode surface area (4 cm2), is the diffusion coefficient of lithium ions in the electrode, is the potential scan rate and is the bulk concentration of Li-ions in the electrolyte (1 mol.L-1).
Online since: February 2011
Authors: Rui Ping Liu, Fu Ming Deng, Xue Jun Lu
A number of factors are known to determine the tool life and performance of PCBN materials.
It is suggested that the binder of the tool is abraded by hard particles of the workpiece material, which leads to CBN grains being detached from the bond.
It was also found that there was small amount of Cr and W on rake face, indicating the precipitation and diffusion of Cr in bearing steel in high temperature, and the appearance of W indicating that W diffusion to the rake face along the CBN grain boundary in the continuous high temperature and pressure generated during the cutting process.
Online since: November 2011
Authors: Zi Min Fan
A large of micropores with a diameter of 80 nm to 120 nm were between SiC grains (Fig.3 (c)), its shape were on round or irregular.
Microporous were formed of SiC grain boundaries, and a large number of microporous were formed when Si reacted with carbon to synthesis SiC(Fig.4 (e)).
Showing 19121 to 19130 of 28515 items