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Online since: October 2007
Authors: Z. Guan, Th. Wichert
The absolute number of 111In atoms is typically in the range 1·10 11 to 5·1011 atoms.
With increasing annealing temperature the grain size and size distribution increases and reaches at an annealing temperature of 473 K the values Do = 7.47 nm and σ = 1.5, corresponding to vol = 9.5 nm (Fig. 5, bottom panel).
The grain size distribution and shape of the nano ZnO crystals was investigated by TEM using a JEM 2010 electron microscope.
The average number of atoms in the O shell is 3.3 ± 1.4.
Since the number of O atoms in the first shell in bulk ZnO is 4 and in bulk In2O3 is 6, the measured value suggests that the In atoms are incorporated on Zn sites in the ZnO lattice.
Online since: October 2015
Authors: D. Ramachandran, Gobi Saravanan Kaliaraj, Ananthakumar Ramadoss, Vinita Vishwakarma
The number of bacteria in the 3 hour culture was estimated by measuring the optical density of the culture at 660 nm (Corning colorimeter 253).
We can directly get some information on grain size and distributions.
TiN coating (Fig.2b) shows uniform grain distribution and smooth morphology along with small clusters.
The average RMS value is very less (2.99 nm), since it contains uniform grains height.
Besides, metals are commonly thrombotic in nature, formation of large number of pseudopods on the surface of the uncoated samples [28], whereas, large numbers of platelets are seen in all the coated samples due to the strong interaction of fibrinogen triggers platelets adhesion.
Online since: February 2014
Authors: Hua Bai, Xiang Hui Lu, Hui Ying Liu
The sum of all the green leaf areas was used to determine LAI based on the number of plants in the plot.
The biomass and grain yield were measured by manually harvesting each plot. 3.
Water use efficiency (WUE) was defined as Where WUE represents water use efficiency for the grain yield (kg/ha), Y is the grain yield of the winter wheat and ET is the evapotranspiration during the winter wheat growth period.
The expression of RMSE is Where pi is model simulated value, oi is measured value and n is total number of data.
Table 7 shows that similar to the measured data, the simulated grain WUE of SS is highest (16.58 kg·mm-1·ha-1) among the four tillage treatments.
Online since: February 2016
Authors: Kang Chiang Liew, Singan Grace
The difference between LVL with plywood is the direction of grains of the veneers (Fig. 3) where LVL has the same grain orientation for all layers of veneer but plywood has a grain orientation alternating to each layer of veneer [11.
Veneer grain direction Fig. 3.
For LVL fabrication, veneers were arranged in the same grain direction for the odd number of veneer layers.
The crucial part in LVL fabrication is its grain direction.
The conclusion is the lower the number of veneer layer in LVL, the more elastic it was and heavier load could be applied on it.
Online since: October 2012
Authors: N. Ehsani, A.J. Ruys, C.C. Sorrell
As for hot pressing, the simultaneous use of pressure and temperature mean that high-density samples (near theoretical) can be produced at much lower temperatures, leading to microstructures with finer grain sizes [23, 24]. 2.
A number of pulled out grains and micropores can be seen in this figure.
The main requirements for transformation toughening are small (tens or hundreds of nanometres) PSZ grain size and a strong matrix [40].
Since the PSZ and HAp grains appeared to form such a uniform crack- and defect-free microstructure, presumably owing to the size of the PSZ particulates, which were smaller than those of the PSZ and Al2O3 fibres.
Particle pull-out can clearly be seen in the fracture surface, but whether it is PSZ particles or HAp grains is unknown.
Online since: August 2013
Authors: Cheng Wei Li, Shu Mei Kang, Ming Gang Shen
Both the transient bubbles and stable bubbles can promote the removal of inclusion; as the power increase, cavitation intensity increases, the number of cavitation bubbles increases, the collision probability of the cavitation bubbles increases with the inclusion, the efficiency of removing inclusion increases; as the wave source into the liquid is 1/2 H, the effect of removing inclusion is the best.
In recent years, the studies on degassing of molten steel, grain refining and preparing new materials under ultrasonic irradiation have been carried out[4-6].
When the power is greater than 1760W, the best stirring time is 120s; 2) When the wave source is located on level 1 / 2 H, ultrasonic inclusion removing effect is best. 3) Not only the stable cavitation bubbles can play the role of removing the inclusions, after the transient bubbles collapse the surface area of the bubbles increase remarkablely , the diameter of the bubbles get smaller, the number of bubbles get greater, so the transient cavitation bubbles are also very useful for the microsize inclusions removal.
Online since: May 2011
Authors: Sudjit Sanguanruang, Rachan Leotphayakkarat, Nitikarn Fangern, Nattamon Koonsaeng, Chamorn Chawengkijwanich
The concentration effects of TritonX-100 surfactant on the structure and the physical properties, such as homogeneity, grain distribution and roughness were studied.
XRD patterns of (a) TiO2 powder and thin films prepared with mole ratio of TritonX-100/TTIP= 0.5 at difference number of coating, (b) TiO2 thin films at difference mole ratios of TritonX-100/TTIP at 9 dip coating layers.
From the AFM images, it shows that the areas of the substrate are covered with small grains of the prepared TiO2 crystals.
The AFM image analysis was carried out by using image-J software to evaluate grain sizes of TiO2 thin films.
The grain sizes of the films made from 0-4 mol of TritonX-100 are in the range of 11.2-35.5 nm.
Online since: July 2015
Authors: Anton A. Naumov, Yuriy A. Bezobrazov, Evgenii V. Chernikov
The rolling mill 2000 scheme The main tasks for different stages of continuous hot rolling simulation are listed below: Furnace and roughing areas: · To set maximum reductions in mills according to equipment characteristics; Heat retention area: · To vary holding time in order to change finishing rolling temperature and austenite grain size; Finishing area and cooling table: · To set maximum reductions in mills according to equipment characteristics and final strip thickness 18 mm; · To cool strip using lamellar system in order to get ferrite-bainite structure.
Simulation of rolling shows that finest austenite grain size is obtained when holding time at heat retention area is 0 s and finishing area rolling speed is 10 m/s (Table 3).
Simulation of rolling Table 3 № Rough rolling speed, [m/s] Holding time, [s] Finishing rolling speed, [m/s] Rolling start temperature, [°С] Rolling finish temperature, [°С] Austenite grain size (AusEvol+), [µm] 1 2 0 2 971 897 60 2 4 1002 956 50 3 10 1036 1016 30 4 60 2 937 869 80 5 4 938 903 80 6 10 956 946 60 7 200 2 817 777 80 8 4 839 821 80 9 10 853 858 80 10 4 0 2 1008 922 50 11 4 1041 988 38 12 10 1066 1042 30 13 60 2 968 893 70 14 4 998 953 60 15 10 996 980 60 16 200 2 840 793 90 17 4 864 841 90 18 10 881 880 90 Simulation of continuous cooling after rolling with cooling speeds 5, 10 and 20 °С/s from the rolling finishing temperature down to 200 °С was provided in program AusEvol Pro for all schedules in order to predict mechanical properties.
Simulation of non-continuous cooling after rolling Table 5 № Phase composition, ferrite+bainite, [%] Average ferrite grain size, [µm] YS, [MPa] TS, [MPa] Elongation, [%] Rolling finish temperature, [°С] Temperature of coiling, [°С] 4 15+85 6,8 566 643 24,2 869 450 9 23+77 8,1 553 625 26,6 858 566 17 34+66 10,7 609 634 25,5 841 451 18 37+63 14,3 553 632 24,3 880 585 Physical simulation of hot rolling Rolling schedules 4, 9, 17 and 18 developed by HSMM, AusEvol+ and AusEvol Pro programs (Tables 3 - 5) were realized on Gleeble-3800 system (Fig. 2a) using tension-compression technique described in details in [8, 9].
Calibration coefficient was received after a number of tensile tests were made with standard geometry samples and samples with developed geometry in previous researches [1, 8].
Online since: June 2010
Authors: Adam Barylski, Mariusz Deja
Apart from the number of pellets' edges engaging the workpiece, also the disc pattern on a tool surface can influence positively the removal rate [4].
Another tool used for experiments has a layer of diamond grains (D107 - grit size 106/90 µm) placed galvanically on a metallic base.
Smaller or fractured grains do not interact with the workpiece as the tool is not worn.
They become active after bigger grains removal from the tool working surface.
Detailed analysis of wear mechanism of the electroplated tool used in a lapping configuration is necessary and will be executed for different grain sizes.
Online since: June 2021
Authors: Aurel Valentin Bîrdeanu, Alin Constantin Murariu
Their specific microstructure consists of a combination of precipitation and grain size refining, being more responsive to heat treatment, resulting in high strength at a low alloy content, and thus providing a proper fatigue and impact strength.
The low alloy content improves weldability, these steels have neither weld-zone softening nor grain coarsening.
To reduce the number of experiments for modelling and analysing of multiple process parameters, statistical techniques and factorial experimental design method [9] were used. 2.
If the welding speed is too low a large amount of energy accumulates in the part resulting in affecting of the steel microstructure by increase of the steel grain.
Since S420MC and S460MC are fine grain steels, when the welding process have to be apply, selecting of the welding parameters have to be made carefully, since it is very important to have a balance between the productivity (when the welding current is high) and the weld quality (proper mechanical and structural characteristics), to have no irremediable changes in structural morphology of the steel and a small hardness difference between different area of the weld.
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