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Online since: July 2012
Authors: V. Teixeira, J.O. Carneiro, S. Azevedo, F. Fernandes, J. Neves
Different scientific and technological studies are being conducted, both in academic and construction industry, aiming the development of new construction materials with properties that can decrease visual pollution of cities, reducing also the number of cleanings required.
A lot of scientific and technological studies are being conducted, both in academic and industrial areas, aiming the development of new materials with properties that can decrease visual pollution of cities, reducing also the number of cleanings required.
The crystalline grain size was calculated from the XRD pattern according to the Scherrer equation [27]
(1) where Dhkl is the mean grain size with crystalline planes (hkl), Bhkl is the WHPM intensity in radians, and l is the wavelength of the CuKa radiation source.
For the coated P-W sample, the TiO2 nanoparticles agglomerations are more homogeneous and exhibit clusters with smaller sizes (see Fig. 3(f)); therefore, as the grain size of these clusters is decreased, the surface-to-volume ratio is increased and the photo-generated electrons and holes could undergo a short pathway to migrate to the surface.
A lot of scientific and technological studies are being conducted, both in academic and industrial areas, aiming the development of new materials with properties that can decrease visual pollution of cities, reducing also the number of cleanings required.
The crystalline grain size was calculated from the XRD pattern according to the Scherrer equation [27]
(1) where Dhkl is the mean grain size with crystalline planes (hkl), Bhkl is the WHPM intensity in radians, and l is the wavelength of the CuKa radiation source.
For the coated P-W sample, the TiO2 nanoparticles agglomerations are more homogeneous and exhibit clusters with smaller sizes (see Fig. 3(f)); therefore, as the grain size of these clusters is decreased, the surface-to-volume ratio is increased and the photo-generated electrons and holes could undergo a short pathway to migrate to the surface.
Online since: September 2014
Authors: Humberto Gracher Riella, G.J.M. Martins, P.B. Prates, Jose Carmino G. Junior, Jonas V. Matsinhe, Cláudia Terezinha Kniess
Abstract: The production of materials from crystallization of glass, called glassceramic, have proved interesting by the possibility of development of different microstructures, with reduced grain size and the presence of residual amorphous phase in different quantities.
The production of the glassceramic has been interesting with the possibility of development of microstructures differentiated, with reduced grain size, random orientation, with the presence of residual amorphous phase in different quantities [4].
Tp '-Tp versus the time of heat treatment, it can be achieved an isothermal nucleation curve, whose behavior allows to evaluate a number of cores, which increases with the duration of crystalline treatment.
The production of the glassceramic has been interesting with the possibility of development of microstructures differentiated, with reduced grain size, random orientation, with the presence of residual amorphous phase in different quantities [4].
Tp '-Tp versus the time of heat treatment, it can be achieved an isothermal nucleation curve, whose behavior allows to evaluate a number of cores, which increases with the duration of crystalline treatment.
Online since: October 2012
Authors: Yun Xu, Xue Meng Xu
Introduction
It is impossible for people to live without grain and oil, and much attention is being paid to research into grain and oil processing and packaging machinery.
Suitable proportion of fast feed volume to fine feed and ratio of working station number for each cycle should be carefully considered
Suitable proportion of fast feed volume to fine feed and ratio of working station number for each cycle should be carefully considered
Online since: July 2011
Authors: Da Chun Yang
Study also shows that particular alloy element type and right content are also important for high boron steel casting to improve the harden ability and hardening capacity, alloy elements can refine grain and improve its strength and toughness at the same time.
This, it may deoxidize, fix nitrogen, purify crystal boundary, refine grain, etc., and may achieve the purposes improving strength and toughness of high boron steel casting finally.
A number of boride and WC distributed in the matrix, microstructure is fine and distributes uniformly.
This, it may deoxidize, fix nitrogen, purify crystal boundary, refine grain, etc., and may achieve the purposes improving strength and toughness of high boron steel casting finally.
A number of boride and WC distributed in the matrix, microstructure is fine and distributes uniformly.
Online since: January 2013
Authors: Dietmar Eifler, M. Smaga, Frank Hahnenberger, Robert Skorupski
Introduction
At temperatures T ≤ ambient temperature (AT) a large number of technically relevant 18/10 chromium/nickel austenitic steels exhibit γ-austenite in a metastable state.
Afterwards grain sizes of 64 µm (AISI 304), 43 µm (AISI 321) and 34 µm (AISI 348) were measured.
Padmanabhan, Influence of martensite formation and grain size on room temperature low-cycle fatigue behaviour of AISI 304LN austenitic stainless steel, Mat.
Afterwards grain sizes of 64 µm (AISI 304), 43 µm (AISI 321) and 34 µm (AISI 348) were measured.
Padmanabhan, Influence of martensite formation and grain size on room temperature low-cycle fatigue behaviour of AISI 304LN austenitic stainless steel, Mat.
Online since: May 2015
Authors: Branislav Hadzima, Miroslav Omasta
The microstructure of the extruded sample (Fig. 1) is formed by polyedric grains of supersaturated solution of zirconium, RE and other alloying elements in magnesium.
The average grain size is 14 µm.
By increasing of electrodeposition time, increase in number of new OCP units together with their gradual growth on the surface of the substrate is seen, that causes increment of current density about 0.190 mA.cm-2 per minute of electrodeposition.
The average grain size is 14 µm.
By increasing of electrodeposition time, increase in number of new OCP units together with their gradual growth on the surface of the substrate is seen, that causes increment of current density about 0.190 mA.cm-2 per minute of electrodeposition.
Online since: August 2021
Authors: I.S. Loginova, N.A. Popov, Alexey N. Solonin
Results and Discussion
After PLM, a dispersed microstructure was formed in the LMZ of the standard AA2024 alloy, characterized by a large number of crystallization cracks located mainly along the grain boundaries and segregation (Fig.1), which arose due to partial evaporation of Mg at a high laser power.
In the LMZ, excess phases with yttrium were formed along the grain boundaries.
In the LMZ, excess phases with yttrium were formed along the grain boundaries.
Online since: April 2013
Authors: H.M. Ghasemi, H. Eskandari
Experimental Procedures
In this investigation atomized pure spherical aluminum powder (0.23%Fe, 0.12%Si, 0.016Zn, 0.01%Cu) with an average grain size of 45 micron were used for the matrix.
The composites containing 20 vol. % of pure SiCp particles (greater than 99%) with grain mean size of 15 micron were made by direct explosive compaction in an axisymetric assembly as shown schematically in Figure 1.
In addition, a number of studies conducted on commerical aluminum based composite systems revealed a decrease in ductility with an increase in crack initiation (stress-accumulation) sites such as amount of SiC particulates and/or porosity levels[16,22], thus supporting the theoretical hypotheses of the role played by porosity as the crack initiation sites.
The composites containing 20 vol. % of pure SiCp particles (greater than 99%) with grain mean size of 15 micron were made by direct explosive compaction in an axisymetric assembly as shown schematically in Figure 1.
In addition, a number of studies conducted on commerical aluminum based composite systems revealed a decrease in ductility with an increase in crack initiation (stress-accumulation) sites such as amount of SiC particulates and/or porosity levels[16,22], thus supporting the theoretical hypotheses of the role played by porosity as the crack initiation sites.
Online since: May 2023
Authors: Norazila Ibrahim, Rozilah Rajmi, Nur Azeni Mohamad Rusop
The estimate value of grain size is around 1.02 µm for x = 0.00 and 1.01 µm for x = 0.05.
It is found that the estimate value of grain size for all sample slightly different but not much change with increased in Ga concentration.
X = 0.05 I = 5 mA I = 1 mA X = 0.00 I = 5 mA I = 1 mA Fig. 4: Resistivity-temperature plot of La0.85Ag0.15Mn1-xGaxO3 for sample x = 0.00 and x = 0.05 with measurement applied current of 1mA and 5mA The increased in applied current caused resistivity to drop and increase in conductivity, indicate that the number of charge carrier increased.
It is found that the estimate value of grain size for all sample slightly different but not much change with increased in Ga concentration.
X = 0.05 I = 5 mA I = 1 mA X = 0.00 I = 5 mA I = 1 mA Fig. 4: Resistivity-temperature plot of La0.85Ag0.15Mn1-xGaxO3 for sample x = 0.00 and x = 0.05 with measurement applied current of 1mA and 5mA The increased in applied current caused resistivity to drop and increase in conductivity, indicate that the number of charge carrier increased.
Online since: May 2012
Authors: Shu Feng Wang, Kai Yi Wang, Xin Jiang Wang, Zhong Qiang Liu
With information technology developing rapidly, remote sensing has been applied in evaluating and early warning of illegal logging.[1] But this method which uses inconsecutive satellite image to protect forest in coarse-grained pattern is not suitable for early fine-grained and real-time detection of deforestation.[2,3]
Wireless sensing networks (WSN) consists of several sensing nodes which gather information from the surrounding environment and communicate with each other to send the measured data to a base station for further processing.[4] Because of its characteristics, such as lower-cost, lower-power, wireless communication and small size, WSN has been applied widely in forest fire detection and environment monitoring.
Table 1 Neighbors Table Node number X Y Z D 0058 x1 y1 z1 d1 0026 x2 y2 z2 d2 … … … … … 0012 xi yi zi di The ranging error ei is defined like Eq.6.
Table 1 Neighbors Table Node number X Y Z D 0058 x1 y1 z1 d1 0026 x2 y2 z2 d2 … … … … … 0012 xi yi zi di The ranging error ei is defined like Eq.6.