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Online since: February 2010
Authors: G. Schreiber, David Rafaja, V. Klemm, D. Šimek, D. Borisova, C. Schimpf, Andreas Jahn
The width of the Ω scans reveals the misorientation of individual grains.
The right grain (austenite) has a higher density of micro-twins than the left grain (ferrite), most likely due to lower stacking fault energy and a higher number of active slip systems in austenite.
The right grain (austenite) has a higher density of micro-twins than the left grain (ferrite), most likely due to lower stacking fault energy and a higher number of active slip systems in austenite.
Online since: February 2013
Authors: Jian Chang Li, Ya Ge Yuan, Juan He, Rui Xu
(GB/T 5512-2008 Inspection of grain and oils, determination of crude fat content in the food).
2.3.2 Determination of lipase activity
Definition of lipase activity: 1g solid enzyme powder hydrolyzing fat to produce 1μmol fatty acid in 1min was a unit of enzyme activity at 40℃ and pH 7.5, indicated with U/g.
Reaction formula as follow: RCOOH + NaOH → RCOONa十H2O Determination method:Referring to the national standard of China (GB/T 5512-2008 inspection of grain and oils, lipase activity determination of grain and oils). 2.3.3 Biogas rate and biogas yield Biogas rate and biogas yield was tested by drainage gas-collecting method.
After sub-peak period, with a large number of substrate consumed, biogas production and enzyme activity both decreased rapidly until biogas production termination.
Reaction formula as follow: RCOOH + NaOH → RCOONa十H2O Determination method:Referring to the national standard of China (GB/T 5512-2008 inspection of grain and oils, lipase activity determination of grain and oils). 2.3.3 Biogas rate and biogas yield Biogas rate and biogas yield was tested by drainage gas-collecting method.
After sub-peak period, with a large number of substrate consumed, biogas production and enzyme activity both decreased rapidly until biogas production termination.
Online since: July 2011
Authors: Zhan Ji Dong, Qing Suo Liu, De Qun Kong
In connection with the peculiar microstructures, the NiTi shape memory alloy (NiTi SMA) offers excellent properties, such as large output, superior shape memory characteristics and higher yield stress for plastic deformation, which make it very attractive for a number of new applications [1].
It has been found in the foregone researches that there are inevitable defects in large-areaed NiTi SMA thin film deposited on PZT substrate, such as inhomogeneous component distribution, local crystal defect and grain-oriented column structure [5].
Fig. 6 shows the cross section images of the prepared composite samples with different physical dimension L fixed M=1mm.Through observation and comparison of the images showing in Fig. 6, it is found that the shape of the crystal grains in NiTi SMA thin film appears an equilateral polygonal geometry in L=2 mm, and that with creasing physical dimension L, the shape of the crystal grains losses gradually equilateral polygonal geometry and becomes complete oriented columnar in the L=5mm.
It has been found in the foregone researches that there are inevitable defects in large-areaed NiTi SMA thin film deposited on PZT substrate, such as inhomogeneous component distribution, local crystal defect and grain-oriented column structure [5].
Fig. 6 shows the cross section images of the prepared composite samples with different physical dimension L fixed M=1mm.Through observation and comparison of the images showing in Fig. 6, it is found that the shape of the crystal grains in NiTi SMA thin film appears an equilateral polygonal geometry in L=2 mm, and that with creasing physical dimension L, the shape of the crystal grains losses gradually equilateral polygonal geometry and becomes complete oriented columnar in the L=5mm.
Online since: June 2015
Authors: U. Hashim, M.A. Farehanim, A.H. Azman, Mohd Khairuddin Md Arshad, Mat Ayub Ramzan, S. Norhafiezah
Nevertheless, the main disadvantage of the sputtering technique is it produced much larger grain size film compared to the other deposition technique, which in this case is unfavourable [10].
It has been studied that due to the larger grain size obtained by the ZnO nanoparticles deposited by spin coater, the sensitivity of the substrate also reduced and not enough crystalline to acquired high capacitance value at low frequency measurement [18].
The small grain size obtained due to its deposition infirmity will be improved by annealing process and further studied in this research.
Acknowledgement The author would like to thank the Department of Higher Education, Ministry of Higher Education, (KPT) for funding this research through the Fundamental Research Grant Scheme (FRGS) with the code number 9003-00360, titled The Study of Electron Tunneling through Single / Multiple Layer Dielectric Thin Film.
It has been studied that due to the larger grain size obtained by the ZnO nanoparticles deposited by spin coater, the sensitivity of the substrate also reduced and not enough crystalline to acquired high capacitance value at low frequency measurement [18].
The small grain size obtained due to its deposition infirmity will be improved by annealing process and further studied in this research.
Acknowledgement The author would like to thank the Department of Higher Education, Ministry of Higher Education, (KPT) for funding this research through the Fundamental Research Grant Scheme (FRGS) with the code number 9003-00360, titled The Study of Electron Tunneling through Single / Multiple Layer Dielectric Thin Film.
Online since: October 2022
Authors: Rudolf Hela, Milan Merunka, Martin Ťažký
An unsuitable chemical composition (increased content of reactive lime and sulphur) is a characteristic of this type of energy by-product, as is the need to significantly increase the value of the water coefficient when used in cement composites that are affected by grain morphology.
The same grain size curve was designed for all formulations to avoid the influence of mechanical parameters due to the different compositions of the aggregate mixture.
The increased amount of these two input components will be due to the high water content of the fluidised fly ash, which is closely related to the unsuitable morphology of these grains.
Without using this agent, an air gap would have existed between the probe and the sample that would have caused a reflection of the ultrasonic waves, and a small number of pulses would have passed through.
The same grain size curve was designed for all formulations to avoid the influence of mechanical parameters due to the different compositions of the aggregate mixture.
The increased amount of these two input components will be due to the high water content of the fluidised fly ash, which is closely related to the unsuitable morphology of these grains.
Without using this agent, an air gap would have existed between the probe and the sample that would have caused a reflection of the ultrasonic waves, and a small number of pulses would have passed through.
Online since: May 2012
Authors: Bei Dou Xi, Ming Xin Wang, Xun Feng Xia, Lin Yuan
In this study, the production of 1 ton of winter wheat grain was selected as the functional unit.
The characterization provides indicators for analyzing the potential contributions of resource extractions and emissions to a number of potential impacts.
Therefore, the program showed significant eutrophication reduction potential per ton of grain.
The eutrophication reduction index was 0.1209-0.3031 which means the eutrophication potential reduction per ton of grain achieved by the STFF program accounted for 12.09-30.31% of the world per capita eutrophication potential in 2000.
The characterization provides indicators for analyzing the potential contributions of resource extractions and emissions to a number of potential impacts.
Therefore, the program showed significant eutrophication reduction potential per ton of grain.
The eutrophication reduction index was 0.1209-0.3031 which means the eutrophication potential reduction per ton of grain achieved by the STFF program accounted for 12.09-30.31% of the world per capita eutrophication potential in 2000.
Online since: April 2008
Authors: Dezső L. Beke, Csaba Cserháti, G.A. Langer, A. Csik, Z. Erdélyi, N. Darowski, I. Zizak, Z. Balogh, E. Dudzik, R. Feyerherm
c) The values of k agree very well with numbers obtained from resistance measurements [11]
in similar samples under similar conditions.
The role of grain boundaries and short circuits [2,25,27] cannot be neglected for the interpretation of the results obtained form thin film reactions and unfortunately, there are no data for tracer grain boundary diffusion of Si in Co and of Si and Co in CoSi published.
Thus it would be desirable to have reliable data on the diffusivities, for example from direct diffusion measurements in thin film geometries with similar grain size and morphology.
The role of grain boundaries and short circuits [2,25,27] cannot be neglected for the interpretation of the results obtained form thin film reactions and unfortunately, there are no data for tracer grain boundary diffusion of Si in Co and of Si and Co in CoSi published.
Thus it would be desirable to have reliable data on the diffusivities, for example from direct diffusion measurements in thin film geometries with similar grain size and morphology.
Online since: October 2008
Authors: Ion Dragoş Uţu, Cosmin Codrean, Viorel Aurel Şerban
In the last two decades
of the XX century were produced a high number of amorphous alloys the most well known being
based on Fe, Co or Ni.
It can be defined as the minimal rate of cooling applied to a melting which avoids the formation of a single crystalline grain into a certain volume of material.
Because the term of crystalline grain depends on the experimental methods capable to show it, practically one considers that the critical amorphization rate of cooling is the minimal rate of cooling which avoid the 10 -6 crystalls fraction formation [1].
(figure 2). 1 mm 1 nm 1 µm Coercitivity, A/cm Graine size 0,01 0,001 0,1 1 10 100 Amorphous alloys d6 1/d ● ● ● ● ▲ ▲ ■ ▲ ■ ■ Permalloy Fe-Si 50.iFe .anocrystalline alloys Fig.2 Variation of the coercitive field with the grain size [1] In the last decades were developed many amorphous and nanocrystalline ferromagnetic families alloys, the most well know being the Fe81B13Si4C2, Fe81B13Si6 amourphous alloys respectively the nanocrystalline alloys familiar under the commercial name of Finemet (Fe-Cu-M-B-Si), Nanoperm (Fe-M-B), or Hitperm (Fe-Co-M-B-Cu) where M = Zr, Hf, Nb, Mo,V.
It can be defined as the minimal rate of cooling applied to a melting which avoids the formation of a single crystalline grain into a certain volume of material.
Because the term of crystalline grain depends on the experimental methods capable to show it, practically one considers that the critical amorphization rate of cooling is the minimal rate of cooling which avoid the 10 -6 crystalls fraction formation [1].
(figure 2). 1 mm 1 nm 1 µm Coercitivity, A/cm Graine size 0,01 0,001 0,1 1 10 100 Amorphous alloys d6 1/d ● ● ● ● ▲ ▲ ■ ▲ ■ ■ Permalloy Fe-Si 50.iFe .anocrystalline alloys Fig.2 Variation of the coercitive field with the grain size [1] In the last decades were developed many amorphous and nanocrystalline ferromagnetic families alloys, the most well know being the Fe81B13Si4C2, Fe81B13Si6 amourphous alloys respectively the nanocrystalline alloys familiar under the commercial name of Finemet (Fe-Cu-M-B-Si), Nanoperm (Fe-M-B), or Hitperm (Fe-Co-M-B-Cu) where M = Zr, Hf, Nb, Mo,V.
Online since: August 2020
Authors: Suhail I.A. Khattab, Omar K. Mohialdeen, Kossay K. Al-Ahmady
Grain size distribution diagram (OD).
Grain size distribution diagram (ND).
Also, an old and new city demolition waste passing sieve number 4 has been mixed with expansive soil to reduce its swelling potential.
Results and Discussion Abrasion test by Los Angeles device are conducted to evaluate grain size distribution, compaction (modified proctor) and unconfined compressive strength.
Grain size distribution diagram (ND).
Also, an old and new city demolition waste passing sieve number 4 has been mixed with expansive soil to reduce its swelling potential.
Results and Discussion Abrasion test by Los Angeles device are conducted to evaluate grain size distribution, compaction (modified proctor) and unconfined compressive strength.
Online since: January 2010
Authors: Gunnar Suchaneck, Anis M. Saad, Gerald Gerlach, M. Kalanda, S. Demyanov
SFMO has a high Curie temperature of 420 K [1], a high
low-field magnetic resistance (MR) associated with grain boundary tunnelling [2], and an about
entire spin polarization [3].
Simultaneously, the number of reacting species was increased.
Fe atom precipitation on grain boundaries was unlikely to occur in this case, because the increase of oxygen pressure during annealing should result in an increase of the amount of precipitated Fe atoms and, correspondingly, in an increase of the magnetic moment of the high-temperature magnetic phase with Тс = 700 К. 100 200 300 400 500 600 700 800 0 1 2 3 4 M (µB/formula unit) T,K B=0.86T 1 2 0 2 4 6 8 -35 -30 -25 -20 -15 -10 -5 0 1 MR, % B, T 2 Fig. 5.
Conclusions The presented work has shown that Sr2FeMoO6±δ synthesis using partially reduced precursors of SrFeO3-х and SrMoO4-у comprising nanometer-sized grains, resulted in single phase Sr2FeMoO6±δ with superstructure ordering of Fe 3+ and Mo5+ cations.
Simultaneously, the number of reacting species was increased.
Fe atom precipitation on grain boundaries was unlikely to occur in this case, because the increase of oxygen pressure during annealing should result in an increase of the amount of precipitated Fe atoms and, correspondingly, in an increase of the magnetic moment of the high-temperature magnetic phase with Тс = 700 К. 100 200 300 400 500 600 700 800 0 1 2 3 4 M (µB/formula unit) T,K B=0.86T 1 2 0 2 4 6 8 -35 -30 -25 -20 -15 -10 -5 0 1 MR, % B, T 2 Fig. 5.
Conclusions The presented work has shown that Sr2FeMoO6±δ synthesis using partially reduced precursors of SrFeO3-х and SrMoO4-у comprising nanometer-sized grains, resulted in single phase Sr2FeMoO6±δ with superstructure ordering of Fe 3+ and Mo5+ cations.