Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: February 2013
Authors: Vladimir S. Komlev, Marco Fosca, Julietta Rau
Phase composition of the obtained DCPD powder was confirmed by the conventional XRD analysis (JCPDS database, card number 72-0713 [9]).
Results and Discussion Generally, the hardening - crystallization process is described by a sigmoid increase of the grain size over time, the expected characteristic crystallization time being of some hours [14].
After this period, the structure is considered to be essentially stable and only slow secondary processes are expected to take place on a longer time scale, such as possible coalescence of crystal grains and relaxations of internal stresses.
P63/m, card number 72-1243 [9]).
Ia (9), card number 72-0713) [9]).
Online since: April 2013
Authors: Kwon Ahn Hee, Young Ho Kim, Keun Gil Sang, Soo Paik Dong, Dong Heon Kang
Their crystal structure, microstructure and electrical properties were investigated as a function of number of interface.
In this study, alternative layers with same volume fraction of NBT and BIT were prepared where the stacking order was varied to change the number of interface.
The stacking sequences are depicted inside the SEM photographs, indicating the number of interface of 4, 2, 1 and null for the specimens of NBIT-a, NBIT-b, NBIT-c, and NBIT-N, respectively.
The surface morphology of Aurivillius compound NBIT-N based on the crystal structure analysis is very similar to that of pure BIT film due to the same crystal structure and the grain sizes of 5~10 and ~100 nm are very closely coexisted.
While the coercive field of < 250 kV/cm is relatively constant for the alternative layer films, the remnant polarization gradually increases with the decrease of the number of interface.
Online since: November 2011
Authors: Ning Li, Wei Zeng Chen
A number of steady motes are in a high speed movement, and collide with each other in all probability.
The product of this solid-state process is usually a number of non-equilibrium phases [11].
In another work, Delogu [3, 4] demonstrated that decreasing the average grain size during mechanical alloying increased diffusivity.
The existence of the large number of nuclei in solution provides a mass of crystal growth cores for combining each other.
Large numbers of congener nuclei congregate at cathode substrate so as to deposit.
Online since: November 2013
Authors: De Cong Li, Hai Rong Wang
A number of articles have been devoted to the thermoelectric properties of materials.
A large number of the type-I clathrates with the chemical formula of II8III16IV30 (II=Ba, Sr, Eu, III=Al, Ga, In, and IV= Si, Ge, Sn) have been synthesized and studied intensively [5-11], which results in relatively high ZT values such as 0.7 at 700 K for Ba8Ga16Ge30 and 0.87 at 870 K for Ba8Ga16Si30 [3].
Stoichiometric amounts of highly pure Ge (grain, 99.99%), Ga (ingot, 99.99%), In (grain, 99.99%) and Ba (ingot, 99.99%, Ba=8.4, in order to compensate the loss during reaction) were placed in a quartz tube coated on the inside with a graphite layer.
Online since: November 2021
Authors: Nitin Ambhore, Dinesh Kamble, Devendra Agrawal
The mechanics of process involve the breaking of covalent bond between different grains of polycrystalline material across the cathode and anode interface along grain boundary due to the chemical reaction between ferric ion and metal grains.
This grain boundary has the lowest potential called open circuit potential.
A neural network has a parallel- distributed architecture with a large number of neurons and connections.
The number of neurons in the hidden layer Figure 3.
The number of output node is taken to one, so as to indicate the system is stable.
Online since: April 2014
Authors: Eckart Uhlmann, Florian Heitmüller
All that leads to the fact that economy of scale effects remain widely unused for repair tasks, although the piece number of components to be repaired is increasing significantly.
Table 1: Grinding conditions grinding parameters cutting speed vc 25 m/s, 30 m/s, 35 m/s, 40 m/s normal force FN 20 N, 30 N, 40 N feed ratevf 300 mm/min - 1400 mm/min number of passes 3 grinding belt geometry 1350 mm x 20 mm abrasive grain material diamond, corundum backing high-tensile polyester grit size dg D91, P180 workpiece geometry planar 100 mm x 20 mm x 30 mm single-convex curvature material Inconel 718, nr. 2.4668 density ρ 9.18 g/cm3 coefficient of thermal extension α 12.6 x  10-6/K Two parts of different geometry were used for the experiments.
The number of supporting points that are required for robot path planning is adapted to the surface’s curvature.
In addition, different abrasive belt specifications with reference to the distribution of the abrasive grains are taken into account.
Figure 3: Comparison of different abrasive belts of applicability for adaptive belt grinding As displayed in figure 3, abrasive belts with grains dispersed in a regular intermittent pattern achieve better results in terms of stationary homogenous depth of cut characteristics as well as lower grinding-in times compared to conventional state-of-the-art ceramic grit belts.
Online since: September 2006
Authors: Mark R. Daymond, Javier R. Santisteban, S. Siano
For the handle, broad diffraction peaks and highly distorted Bragg edges -typical of a columnar grain microstructure- suggested that this specimen was cast and did not undergo significant thermal or mechanical treatment.
These transmission spectra can be interpreted as being the superposition of the transmission spectra from a limited number of single crystals.
So, the spectra on the right hand side of Fig. 4 point to a microstructure having only a small number of relatively large grains within the 2x2 mm2 slice studied by the experiment.
Online since: October 2015
Authors: Petr Mondschein, Pavel Svoboda, Adam Konvalinka
The issue of the behavior of asphalt mixtures, their rheology and predicting models formation of cracks and permanent deformation is engaged in a number of authors, collectively, eg., in [1].
Structural layer consisting primarily ACC can be divided by the maximum grain size, which is used in asphalt ground.
The most commonly used maximum grain size are 11, 16 and 22 mm.
Asphalt mixtur efor asphalt and cement concrete was made of 50/70 bitumen and aggregates from quarry Markovice with a maximum grain size of 16 mm.
(1) where Dcd is design value of the total relative failure under the design period, TNVcd is design value of the total number of passes for TNV design period, TNVcd,lim is the threshold for the number of passes TNV design period.
Online since: April 2012
Authors: S. Tumminello, S. Sommadossi
Al/Ni system has stimulated a large number of phase equilibrium, thermodynamic, diffusion and related studies.
Finally a selective chemical etching was applied to develop IPs’ grain size and microstructure.
This fact explains the large grain size of Al3Ni2 compared with interval A, showing globular microstructure development.
The IPs growing through a solid/solid interaction showed much smaller grain size.
Online since: September 2014
Authors: Ahmed El-Shenawy, Mohamed Shehadeh
The Reynolds number calculations were based on the pipe inner diameter.
Reynolds number), see Table 1.
Sand of average grain size of 300 mm was added to the prepared seawater at different concentrations.
Reynolds number) with 30 minute increments, see Table 1.
Similar trajectory is noticed for Reynolds numbers 800, 1408.8 and 1737.8.
Showing 18051 to 18060 of 28673 items