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Online since: October 2013
Authors: A.S. Vereschaka, Vladimir P. Tabakov
As far as the defectiveness of a coating is concerned, temperatures can influence the following mechanisms of coating formation [4]: use of residual gas atoms; vacancy hardening; decreasing the grain size of substructure condensate and increasing dislocation density.
The chemical composition of the coatings is determined by the design of the vacuum-arc installation, namely on the number of evaporating cathodes, on their location relative to one another, on the distance between evaporating cathodes and the cutting tool.
Using as an intermediate layer the TiМоN coating (TiCN-TiМоN-TiN coating), which has lower fracture resistance than the TiZrN coating, reduces the number of a tool’s working cycles N2C, N3,4C and N5C.
The said reduction of the number of working cycles N2C, N3,4C and N5C results in an increase of the overall thickness of a coating (Table 4).
The thus formed multilayer coating TiCN15%-TiZrN-TiNCTM provides an increase in the number of a tool’s working cycles N2C, N3,4C and N5C in comparison with the corresponding figure for a tool with the TiCN-TiZrN-TiN coating.
The chemical composition of the coatings is determined by the design of the vacuum-arc installation, namely on the number of evaporating cathodes, on their location relative to one another, on the distance between evaporating cathodes and the cutting tool.
Using as an intermediate layer the TiМоN coating (TiCN-TiМоN-TiN coating), which has lower fracture resistance than the TiZrN coating, reduces the number of a tool’s working cycles N2C, N3,4C and N5C.
The said reduction of the number of working cycles N2C, N3,4C and N5C results in an increase of the overall thickness of a coating (Table 4).
The thus formed multilayer coating TiCN15%-TiZrN-TiNCTM provides an increase in the number of a tool’s working cycles N2C, N3,4C and N5C in comparison with the corresponding figure for a tool with the TiCN-TiZrN-TiN coating.
Online since: September 2017
Authors: S.V. Davydov, O.A. Gorlenko
These substances provide the appearance of additional crystallization centers in the molten metal, which solve the problem of obtaining dense, fine-grained and homogeneous structure of the alloy in the solid state.
Thermokinetic factors affect the critical size and the speed of nuclei formation, their number and form.
The table taken from [8] shows slag number and composition in old piles of copper-smelting plants.
The phase of nonmetallic inclusions consisting of oxides, carbonitrides, sulfides, and phosphide eutectic, the total number of which can reach up to 0.2 % by mass of iron [13]. 2.
This explains a number of cases, when sulphur and oxygen suddenly show graphitizing action in iron.
Thermokinetic factors affect the critical size and the speed of nuclei formation, their number and form.
The table taken from [8] shows slag number and composition in old piles of copper-smelting plants.
The phase of nonmetallic inclusions consisting of oxides, carbonitrides, sulfides, and phosphide eutectic, the total number of which can reach up to 0.2 % by mass of iron [13]. 2.
This explains a number of cases, when sulphur and oxygen suddenly show graphitizing action in iron.
Online since: July 2011
Authors: Zhu Ge Yan, Simon Beecham, Chun Qi Lian
The porous nature of the material brings a number of advantages.
For a media with relatively low permeability such as fine-grained soils, it is easier to conduct the falling head test.
Reynolds Number for different heads Sample No.
Fig. 5 Calculated Reynolds Number for the constant head tests Fig. 5 shows that the Reynolds Number (Re) gradually increases the head increases.
Fig.5 shows that smaller heads generates smaller Reynolds Numbers, which indicates more smooth and steady flow conditions in the porous media.
For a media with relatively low permeability such as fine-grained soils, it is easier to conduct the falling head test.
Reynolds Number for different heads Sample No.
Fig. 5 Calculated Reynolds Number for the constant head tests Fig. 5 shows that the Reynolds Number (Re) gradually increases the head increases.
Fig.5 shows that smaller heads generates smaller Reynolds Numbers, which indicates more smooth and steady flow conditions in the porous media.
Online since: January 2024
Authors: Sulistiyani Hayu Pratiwi, Mona Sari, Yusril Yusuf
PVA (10 wt%) made in USA, Catalog Number 114266, Packing: 100 Gr and 1400 mwh~.
FTIR analysis using Thermo Nicolet iCS10-Japan with wave numbers from 600 to 4000 cm-1 to identify the presence of -OH, PO43- and CO32-.
Results of XRD analysis on scaffolds PVA/Chitosan and PVA/Chitosan/CHA FTIR analysis Figure 3 shows that the PVA/Chitosan scaffold identified by stretching -OH is hydroxide at wave number 3293.89 cm-1; stretching of CH2 at wave number 2929.96 cm-1; C – O stretch at wave number 1660.41 cm-1 and PO43- group at wave number 1074.87 cm-1, while the PVA/Chitosan/CHA scaffold identified -OH stretch at wave number 3299.90 cm-1; stretching of CH2 at wave number 2915.29 cm-1 and the group PO43- at wave number 1019.33 cm-1.
FTIR analysis of PVA/Chitosan and PVA/Chitosan /CHA SEM-EDX and Porosity Analysis The SEM results in Fig.4 show the morphology of PVA/Chitosan with a flat and solid surface, while PVA/Chitosan/CHA shows a rough surface, accumulated grains and inhomogeneous pores [21].
FTIR analysis using Thermo Nicolet iCS10-Japan with wave numbers from 600 to 4000 cm-1 to identify the presence of -OH, PO43- and CO32-.
Results of XRD analysis on scaffolds PVA/Chitosan and PVA/Chitosan/CHA FTIR analysis Figure 3 shows that the PVA/Chitosan scaffold identified by stretching -OH is hydroxide at wave number 3293.89 cm-1; stretching of CH2 at wave number 2929.96 cm-1; C – O stretch at wave number 1660.41 cm-1 and PO43- group at wave number 1074.87 cm-1, while the PVA/Chitosan/CHA scaffold identified -OH stretch at wave number 3299.90 cm-1; stretching of CH2 at wave number 2915.29 cm-1 and the group PO43- at wave number 1019.33 cm-1.
FTIR analysis of PVA/Chitosan and PVA/Chitosan /CHA SEM-EDX and Porosity Analysis The SEM results in Fig.4 show the morphology of PVA/Chitosan with a flat and solid surface, while PVA/Chitosan/CHA shows a rough surface, accumulated grains and inhomogeneous pores [21].
Online since: April 2008
Authors: Sarah Lam, Kimble Halliday, Tarek Qasim
biting on a grain of sand/hard object)?
The wet specimen had a marked reduction in the number of cycles taken to reach failure relative to the dry specimen.
The number of cycles to crack initiation was significantly lesser than in the dry specimen, especially in the 8kg loading.
With increased load, the number of cycles to initiation of radial cracks decreased, as is predictable.
The number of cycles to crack initiation was significantly less than in the dry specimen, especially in the 8kg (78N) loading.
The wet specimen had a marked reduction in the number of cycles taken to reach failure relative to the dry specimen.
The number of cycles to crack initiation was significantly lesser than in the dry specimen, especially in the 8kg loading.
With increased load, the number of cycles to initiation of radial cracks decreased, as is predictable.
The number of cycles to crack initiation was significantly less than in the dry specimen, especially in the 8kg (78N) loading.
Online since: April 2015
Authors: S. Hadi Tabaian, Karim Faez, Mohammadreza Pourfard
This measure calculates the number of pores in the radius of r of a circle which have opposite partners to the total number of pores in this circle.
This method can also define the number of domains in an image automatically.
After this step, the number of domains is decreased.
If we want a specific lower number of domains, we could also exert a threshold on the algorithm and only choose the k largest domain.
Steinhart, Quantitative Analysis of the Grain Morphology in Self-Assembled Hexagonal Lattices, J.
This method can also define the number of domains in an image automatically.
After this step, the number of domains is decreased.
If we want a specific lower number of domains, we could also exert a threshold on the algorithm and only choose the k largest domain.
Steinhart, Quantitative Analysis of the Grain Morphology in Self-Assembled Hexagonal Lattices, J.
Online since: November 2012
Authors: C. Aswin, S. Srichand Vishnu, D. Aravind Kumar, S. Deepthi, S.K. Kumaresh, M. Arun, V.R. Sanal Kumar
Under these conditions, the convective flux to the surface of the propellant will be enhanced, which in turn enhance the local Reynolds number.
This effect will further accentuated in the case of star grain downstream of sudden expansion where the star points generate multiple flame fronts.
Figure 4 is demonstrating the axial total temperature variations of DTMs at different time intervals revealing the flow unsteadiness causing the variations of Reynolds number during the starting transient phase, which alter the convective heat flux and the ignition sequence / flame spread in a rocket motor with non-uniform port geometry.
We inferred that when the upstream port is narrow the convective flux to the surface of the propellant will be enhanced, which in turn enhance the local Reynolds number.
This effect will further accentuated in the case of star grain downstream of sudden expansion where the star points generate multiple flame fronts.
Figure 4 is demonstrating the axial total temperature variations of DTMs at different time intervals revealing the flow unsteadiness causing the variations of Reynolds number during the starting transient phase, which alter the convective heat flux and the ignition sequence / flame spread in a rocket motor with non-uniform port geometry.
We inferred that when the upstream port is narrow the convective flux to the surface of the propellant will be enhanced, which in turn enhance the local Reynolds number.
Online since: November 2013
Authors: Jaroslaw Piątkowski
It has also been found that strong overheating of alloy above Tliq "enhances" the process of modification, resulting in the formation of fine-grain structure.
Additionally, rapid heat transfer refines alloy structure, raising the number of potential substrates for heterogeneous nucleation of Si.
Additionally, rapid heat transfer refines alloy structure, raising the number of potential substrates for heterogeneous nucleation of Si.
Online since: May 2011
Authors: Min Zheng, Qing Wang, Zuo Shan Wang
Scan electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to determine the grain size, shape, degree of nitrogen incorporation and nature of the resultant oxynitride chemical bonding.
The most surprising is the change of the position and number of exothermic peaks.
The most surprising is the change of the position and number of exothermic peaks.
Online since: February 2011
Authors: Jia Xin Guo, Chun Sen Zhou, Pei Xian Zhu
Shoot line Yan to cast light a table method(XRD) and scan an electronic microscope method(SEM) with the X, and deeply shoot an electronic microscope method(TEM) to carry on token to the TiO2 powder sample of making,[1] result enunciation titanium sour D ester water solution method legal system have of TiO2 catalysts is the Rui titanium mineral type structure, grain the path be not the biggest over 50 nms.
Because the plate by second boiling distilled water for a while, the pore water can dissolve sodium sulfate in distilled water twice, so that the gap plate number increases, the proliferation of beneficial oxygen; plate muffle furnace at 350°C Heating 30min, so that PTFE emulsion distribution, which will help create holes; into acetone dipping 10h, is conducive to the plate hydrophobic and surface treatment (degreasing).
Because the plate by second boiling distilled water for a while, the pore water can dissolve sodium sulfate in distilled water twice, so that the gap plate number increases, the proliferation of beneficial oxygen; plate muffle furnace at 350°C Heating 30min, so that PTFE emulsion distribution, which will help create holes; into acetone dipping 10h, is conducive to the plate hydrophobic and surface treatment (degreasing).