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Online since: October 2015
Authors: Tatiana Bugrova, Grigory Mamontov, Anna Savel'eva, Andrey Petrov, Valeriy Dutov
The TGA data are in good agreement with XRD results.
Further increase of calcination temperature to up to 700 and 800 °C leads to reduction of specific surface area to 165 and 151 m2/g respectively.
This fact indicates reduction of amount of small mesopores (2–5 nm) and increase of quantity of wide mesopores (more than 10 nm).
Temperature increase leads to reduction of contribution of mesopores of with sizes of 2–5 nm, which is conformed by reduction in the width of the hysteresis loop in the relative pressure range of 0.45–1.0 p/po on the nitrogen adsorption-desorption isotherms.
Increasing of total pore volume and broadening of pore size with insignificant reduction of specific surface area take place at these temperatures.
Further increase of calcination temperature to up to 700 and 800 °C leads to reduction of specific surface area to 165 and 151 m2/g respectively.
This fact indicates reduction of amount of small mesopores (2–5 nm) and increase of quantity of wide mesopores (more than 10 nm).
Temperature increase leads to reduction of contribution of mesopores of with sizes of 2–5 nm, which is conformed by reduction in the width of the hysteresis loop in the relative pressure range of 0.45–1.0 p/po on the nitrogen adsorption-desorption isotherms.
Increasing of total pore volume and broadening of pore size with insignificant reduction of specific surface area take place at these temperatures.
Online since: May 2019
Authors: Maadoum M. Mustafa, Osama Ahmed Mohamed
ASR can result in significat reduction in concrete compressive strength in the long term [9].
Analysis of the incremental pore size distribution data shows that AAS concrete has a much higher proportion of pore sizes within the mesopore range than OPC cement.
Decreased mesopores which contributed to reduction to reduction in autogenous and drying shrinkage.
Carbonation Alkali Activated Slag Carbonation of the pore solution in concrete and mortar results in reduction of alkalinity, which increases susceptibility of reinforcing steel bars to corrosion.
Carbonation Depth Variation with Silica Modulus for 6% and 8% Na2O The authors argue that carbonation of C-(A)-S-H phase leads to reduction in the molar volume of solids, which explains the increase of the total porosity and average pore size, subsequently reduction in compressive strength.
Analysis of the incremental pore size distribution data shows that AAS concrete has a much higher proportion of pore sizes within the mesopore range than OPC cement.
Decreased mesopores which contributed to reduction to reduction in autogenous and drying shrinkage.
Carbonation Alkali Activated Slag Carbonation of the pore solution in concrete and mortar results in reduction of alkalinity, which increases susceptibility of reinforcing steel bars to corrosion.
Carbonation Depth Variation with Silica Modulus for 6% and 8% Na2O The authors argue that carbonation of C-(A)-S-H phase leads to reduction in the molar volume of solids, which explains the increase of the total porosity and average pore size, subsequently reduction in compressive strength.
Online since: May 2014
Authors: Eiji Yamasue, Hideyuki Okumura, Daisuke Shiba, Keiichi N. Ishihara
Since in general the CS reduction is rather fast at the beginning of MC process, as indicated by “no PCA”, the first drop for the former could be just pulverization of powder as usual.
Hexane could then provide more effective CS reduction compared with methanol.
And, according to the data of “no PCA” and of unbranched alkanes milled longer than 3h the steady state should exist in terms of the CS variation.
The ethylene glycol results are consistent with highly viscous ionic liquids, with or without oxygen, where the CS reduction and the CTN behavior are very similar.
Liessmann, et al., Data compilation of the Saechsische Olefinwerke Boehlen, Germany, 1995 [16] H.
Hexane could then provide more effective CS reduction compared with methanol.
And, according to the data of “no PCA” and of unbranched alkanes milled longer than 3h the steady state should exist in terms of the CS variation.
The ethylene glycol results are consistent with highly viscous ionic liquids, with or without oxygen, where the CS reduction and the CTN behavior are very similar.
Liessmann, et al., Data compilation of the Saechsische Olefinwerke Boehlen, Germany, 1995 [16] H.
Online since: February 2013
Authors: Huai Ying Zhou, Zhong Min Wang, Gui Yin Li, Jian Cui, Zhi De Zhou, Feng Lei Liu
In order to further study adsorption behaviour, adsorption isotherm data were analyzed by the Langmuir model [16], which was widely used to describe the adsorption isotherm.
Consequently, it turned out that the experimental data was fitted for the Langmuir isotherm model.
This result confirmed that the adsorption of Au3+ by immobilized PT was an oxidation-reduction reaction.
The immobilized PT had a very good effect of adsorption for Au3+ that may be attributed to the reduction Au3+ to Au during the adsorption process.
FT-IR, XRD and SEM analysis suggested that the oxidation-reduction reaction occured between phenolic hydroxyl groups of persimmon tannin and chlorogold.
Consequently, it turned out that the experimental data was fitted for the Langmuir isotherm model.
This result confirmed that the adsorption of Au3+ by immobilized PT was an oxidation-reduction reaction.
The immobilized PT had a very good effect of adsorption for Au3+ that may be attributed to the reduction Au3+ to Au during the adsorption process.
FT-IR, XRD and SEM analysis suggested that the oxidation-reduction reaction occured between phenolic hydroxyl groups of persimmon tannin and chlorogold.
Online since: July 2007
Authors: Paolo F. Bariani, Stefania Bruschi, Andrea Ghiotti
Furthermore, in order to localize the deformation in the central zone, different shapes were
investigated, together with the reduction of the sheet thickness in the central part of the specimen.
The optimized specimen has a cruciform shape, without any lateral slot in the arms and a reduction of thickness of 50% in the central area of the specimen.
Also a double reduction of thickness in the central area (tested in (b) of Fig.1) determines a non homogeneous plastic deformation of the specimen at elevated temperature.
During the deformation process, the 3D-coordinates of the surface of the specimen are monitored and afterwards the acquired data are elaborated to compute the displacement vectors, the local strain values as well as the differences between the contour of the undeformed and the deformed specimen.
Chastel: Hot Stamping of Quenchable Steels: Material Data and process Simulations, IDDRG 2003 Conference, Proceedings (2003), pp. 166-164, 2003
The optimized specimen has a cruciform shape, without any lateral slot in the arms and a reduction of thickness of 50% in the central area of the specimen.
Also a double reduction of thickness in the central area (tested in (b) of Fig.1) determines a non homogeneous plastic deformation of the specimen at elevated temperature.
During the deformation process, the 3D-coordinates of the surface of the specimen are monitored and afterwards the acquired data are elaborated to compute the displacement vectors, the local strain values as well as the differences between the contour of the undeformed and the deformed specimen.
Chastel: Hot Stamping of Quenchable Steels: Material Data and process Simulations, IDDRG 2003 Conference, Proceedings (2003), pp. 166-164, 2003
Online since: April 2016
Authors: Rui Ying He, Chang Ping Wei, Guo Dong Wang, Jing San, Chun Jia Peng
The band gap energy of SnO2 is 3.6 ev, can only be stimulated by short wavelength ultraviolet rays (wavelength less than 350nm)and produce electron-hole pairs, but its CB is lower than TiO2 (+0.07V) ,and VB is higher (+3.67V), that means SnO2 behaves stronger oxidation and reduction ability [1,2].
The SnO2/TiO2 composite film can not take full advantage of the reduction of the light generated electrons on the underlying of SnO2, so the oxidation reduction ability of SnO2/TiO2 composite film is weak [3,4].
According to the Debye Scherrer formula by FWHM method calculation of the prepared catalyst crystal grain size of a is 11nm, B, C is 19nm,similar with the data of particle diameter from scanning electron microscope (SEM) and transmission electron microscopy (TEM) The unit cell parameters and crystal particle size of the titanium dioxide doped with copper were changed.
EDS data showed that: the main elements of Ti, Cu, Sn impurity elements could not been found .
Terrace structure lead hole - electron pairs more easily to separate, improve the oxidation reduction ability and adjust its thickness could make the electron and hole failed to reach the interface at the same time [14], avoiding the aggregation and inactivation of electrons to achieve the two aspects of TiO2 as ideal photocatalyst.
The SnO2/TiO2 composite film can not take full advantage of the reduction of the light generated electrons on the underlying of SnO2, so the oxidation reduction ability of SnO2/TiO2 composite film is weak [3,4].
According to the Debye Scherrer formula by FWHM method calculation of the prepared catalyst crystal grain size of a is 11nm, B, C is 19nm,similar with the data of particle diameter from scanning electron microscope (SEM) and transmission electron microscopy (TEM) The unit cell parameters and crystal particle size of the titanium dioxide doped with copper were changed.
EDS data showed that: the main elements of Ti, Cu, Sn impurity elements could not been found .
Terrace structure lead hole - electron pairs more easily to separate, improve the oxidation reduction ability and adjust its thickness could make the electron and hole failed to reach the interface at the same time [14], avoiding the aggregation and inactivation of electrons to achieve the two aspects of TiO2 as ideal photocatalyst.
Study of Softening Temperature Range of Agglomerate Depending on its Structure and Phase Composition
Online since: December 2023
Authors: Andrey N. Dmitriev, Galina Yu. Vitkina, Elena A. Vyaznikova, Roman V. Alektorov
The softening interval of the agglomerates with different basicities was estimated in accordance with the Russian State Standard 26517-85 by moving the vertical shaft from the zero position to a 40% reduction in the initial layer height.
According to light microscopy data, agglomerates with a basicity of 1.2 to 3.0 are characterized by round, less often elongated shapes.
By analyzing the data, the start and end softening temperatures can be determined, and the blast furnace process can be optimized for maximum efficiency and productivity.
This indicates that in the first stage in the agglomerate, there was softening of the silicate bond and subsequent consolidation of the crystalline phase and reduction of pores (plastic deformation).
Kunitomo, Evaluation of softening, shrinking and melting reduction behavior of raw materials for blast furnace, ISIJ International, 51, 8 (2011), 1316-1321
According to light microscopy data, agglomerates with a basicity of 1.2 to 3.0 are characterized by round, less often elongated shapes.
By analyzing the data, the start and end softening temperatures can be determined, and the blast furnace process can be optimized for maximum efficiency and productivity.
This indicates that in the first stage in the agglomerate, there was softening of the silicate bond and subsequent consolidation of the crystalline phase and reduction of pores (plastic deformation).
Kunitomo, Evaluation of softening, shrinking and melting reduction behavior of raw materials for blast furnace, ISIJ International, 51, 8 (2011), 1316-1321
Online since: June 2011
Authors: Xin Kuan Liu, Yang Hui Xiang, Wen Bin Hu, Wen Jiang Ding, Ping Liu
So the data at room temperature was used for the convenience of calculation.
The data used in Fig.1 are as below: [F-]=0.571mol/L, [Na+]=0.189mol/L for the original solution; replenishment of [F-]=0.220mol/L, [Na+]=0.189mol/L for each MTO.
However the reduction of stability constant accelerated obviously on magnesium alloys after three MTO.
It also causes the reduction of the stability constant of the operating solution.
The reduction of deposition speed after three MTO also relates with appearance of the sediment.
The data used in Fig.1 are as below: [F-]=0.571mol/L, [Na+]=0.189mol/L for the original solution; replenishment of [F-]=0.220mol/L, [Na+]=0.189mol/L for each MTO.
However the reduction of stability constant accelerated obviously on magnesium alloys after three MTO.
It also causes the reduction of the stability constant of the operating solution.
The reduction of deposition speed after three MTO also relates with appearance of the sediment.
Online since: September 2023
Authors: Vamsi Krishna Pasam, Gamidi Kartheek, Suryachandra Rankireddy, Lingaraju Dumpala
Cutting speed and amplitude were the most influencing factors in cutting force reduction.
Chip load and depth of cut were not effective on the cutting force reduction.
The reduction in cutting force, cutting temperature and surface roughness was observed in UVAT compared to CT.
Reduction in TWCR resulted in enhanced performance of UVAT process.
For measuring the cutting forces during machining process, a six component dynamometer (Make: Kistler automation Ltd; model 9257B) equipped with data acquisition system with charge amplifier (Type:5070A) was used.
Chip load and depth of cut were not effective on the cutting force reduction.
The reduction in cutting force, cutting temperature and surface roughness was observed in UVAT compared to CT.
Reduction in TWCR resulted in enhanced performance of UVAT process.
For measuring the cutting forces during machining process, a six component dynamometer (Make: Kistler automation Ltd; model 9257B) equipped with data acquisition system with charge amplifier (Type:5070A) was used.
Online since: September 2013
Authors: Jong Deok Kim, Young Moo Heo, Si Tae Won
Recently, many studies on the weight reduction of automobile for fuel saving were underway.
Especially, researches on weight reduction of automobiles wherein strength of components and functional factors are satisfied while weight is decreased are very active.
Fig. 6 Fine blanked samples and shear surface from the experiments (clearance: 0.015mm) Fig. 7 Fine blanked samples and shear surface from the experiments (clearance: 0.1mm) Fig. 8 Fine blanked samples and shear surface from the experiments (clearance: 0.2mm) Fig. 9 Measurement results of bulging height on the inner corner shapes Fig. 9 shows the data of measured results.
Especially, researches on weight reduction of automobiles wherein strength of components and functional factors are satisfied while weight is decreased are very active.
Fig. 6 Fine blanked samples and shear surface from the experiments (clearance: 0.015mm) Fig. 7 Fine blanked samples and shear surface from the experiments (clearance: 0.1mm) Fig. 8 Fine blanked samples and shear surface from the experiments (clearance: 0.2mm) Fig. 9 Measurement results of bulging height on the inner corner shapes Fig. 9 shows the data of measured results.