Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: August 2014
Authors: Juraj Ladomerský, Emília Hroncová
Currently, the number of agricultural subjects managing their land, pastures and fields used for the production of livestock and crops is decreasing.
The number of livestock is decreasing more quickly than the volume production of crops such as barley, wheat and corn.
After an effective harvest, mainly grain from crops is used.
The number of livestock is decreasing more quickly than the volume production of crops such as barley, wheat and corn.
After an effective harvest, mainly grain from crops is used.
Online since: March 2017
Authors: Jin Shu Cheng, Jing Wang, Yan Sheng Hou, Shao Yang Qian, Jun Feng Kang
As is well known, granite process industry generates a large number of wastes, due to the sawing and polishing processes.
The non-isothermal crystallization kinetics of glass can be described by the Kissinger equation[11] expressed as (1): (1) where α is the heating rate, R is the gas constant, and C is the constant number.
A lot of small grains occurred in the alkali-leached surfaces.
The non-isothermal crystallization kinetics of glass can be described by the Kissinger equation[11] expressed as (1): (1) where α is the heating rate, R is the gas constant, and C is the constant number.
A lot of small grains occurred in the alkali-leached surfaces.
Online since: August 2013
Authors: Fei Fei Xiang, Zhong Ke Xiang, Hong Ying Li
Such as bamboo can be used in the make of scaffold, building a house; Straw small but can shore up the big grain,And when is suffered from the wind force function is generally broken in the root, It is shown that has very good compression and lateral force resistance ability.
Select 8 node Solid45 number unit that can better simulation entity plastic, creep, large deflection, etc free mesh With the default level 6 accuracy,Get finite element model of the table.
Modal analysis is mainly used to determine the vibration characteristic of institutions or machine parts,Mainly is the inherent frequency and vibration mode,At the same time is the basis of other dynamics analysis,Such as harmonic response analysis ,Transient dynamics analysis and spectrum analysis, and so on. choose Block Lanczos method when we analysis,also select Solid95 number unit.
Select 8 node Solid45 number unit that can better simulation entity plastic, creep, large deflection, etc free mesh With the default level 6 accuracy,Get finite element model of the table.
Modal analysis is mainly used to determine the vibration characteristic of institutions or machine parts,Mainly is the inherent frequency and vibration mode,At the same time is the basis of other dynamics analysis,Such as harmonic response analysis ,Transient dynamics analysis and spectrum analysis, and so on. choose Block Lanczos method when we analysis,also select Solid95 number unit.
Online since: September 2013
Authors: Panphot Ruethaitananon, Tawinun Isariyamateekun, Kageeporn Wongpreedee
The cross-section a) silver-pure aluminium bonding (sample A4) b) silver-aluminum 5083 alloy bonding (sample B4) c) atomic compositions of pure aluminium and aluminum 5083 alloys as number marking from a) and b) displaying the qualitative EDS results.
Acknowledgements This work has been supported by Research Government budget, Strategic Wisdom and Research Institute, Srinakharin University with contract number 140/2556.
Pijanowski: Wood Grained Metal (Mokume-Gane, 2001)
Acknowledgements This work has been supported by Research Government budget, Strategic Wisdom and Research Institute, Srinakharin University with contract number 140/2556.
Pijanowski: Wood Grained Metal (Mokume-Gane, 2001)
Online since: April 2013
Authors: Yan Ni Wen
In our previously papers, the method has been used successively to calculate the vacancy diffusion in the bulk and surface of pure metals [18, 19], the surface energy [20, 21], the grain boundary energy [22] and the interfaces energy [23].
Calculation process and results In order to simulate half-infinite Cu3Ag ordered alloy (001) surface with an isolated vacancy, the periodic boundary condition can be applied to reduce the number of atoms for representing the structure and a computational cell with 930 atoms was used which was surrounded by a mantle of atoms, in which is the lattice constant of Cu3Ag that is 3.77 Å.
In order to facilitate expression, the atoms are labeled with Cu (red balls) or Ag (blue balls) together with their layer number from the top layer.
Calculation process and results In order to simulate half-infinite Cu3Ag ordered alloy (001) surface with an isolated vacancy, the periodic boundary condition can be applied to reduce the number of atoms for representing the structure and a computational cell with 930 atoms was used which was surrounded by a mantle of atoms, in which is the lattice constant of Cu3Ag that is 3.77 Å.
In order to facilitate expression, the atoms are labeled with Cu (red balls) or Ag (blue balls) together with their layer number from the top layer.
Online since: February 2016
Authors: Xia Li, Ting Ting Ma, Rui Shen Zhou
Recently, a number of Ta-based oxides have been used as new photocatalyst materialsbecause of their high activity in the photocatalytic splitting of H2O into H2 and O2 [3,4].
Despite these successes, a number of key parameters that determine the photocatalytic activity remain unclear.
However, this type of reaction requires high temperatures and long calcinations, which lead to grain growth (i.e., smaller surface area) and loss of stoichiometry of the products.
Despite these successes, a number of key parameters that determine the photocatalytic activity remain unclear.
However, this type of reaction requires high temperatures and long calcinations, which lead to grain growth (i.e., smaller surface area) and loss of stoichiometry of the products.
Online since: February 2012
Authors: Jian Guo Chen, Ying Yu
Introduction
With the rapid development and popularization of automobile, tire puncture has become the “number one killer” because of its unpredictable and uncontrollable accidents.
The data shows the number of car crash accidents, caused by been in a sudden flat at high speed, accounted for 49.81% of highway accidents, casualties accounted for 63.94%, direct property losses accounted for 43.38%, a tire failure mortality speed of more than 120 km per hour approached 100%.
And the Shaft grain connection design is done in the basic circle heart, and the installation structure diagram of the support institutions can be shown in Fig.4.
The data shows the number of car crash accidents, caused by been in a sudden flat at high speed, accounted for 49.81% of highway accidents, casualties accounted for 63.94%, direct property losses accounted for 43.38%, a tire failure mortality speed of more than 120 km per hour approached 100%.
And the Shaft grain connection design is done in the basic circle heart, and the installation structure diagram of the support institutions can be shown in Fig.4.
Online since: July 2014
Authors: Xi Bin Wang, Wen Xiang Zhao, Yong Bo Wu, Zhi Qiang Liang, Li Jiao, Qiu Yan Wang
In this method, the profile of ground surface is completely covered with boxs and the number of boxs is counted.
The minimal number of boxs N(r) can be expressed Eq.1, where r is edge length of box, C is a constant value and FD is fractal dimension.
Jiao, Experimental study on brittle–ductiletransition in elliptical ultrasonic assisted grinding (EUAG) of monocrystal sapphire using single diamond abrasive grain, Int.
The minimal number of boxs N(r) can be expressed Eq.1, where r is edge length of box, C is a constant value and FD is fractal dimension.
Jiao, Experimental study on brittle–ductiletransition in elliptical ultrasonic assisted grinding (EUAG) of monocrystal sapphire using single diamond abrasive grain, Int.
Online since: September 2007
Authors: C. Pappalettere, C. Casavola
Therefore, some hypotheses are needed to simplify the
complexity of real cases: (i) after welding cycle, the component is not characterized by
homogeneous material: base metal, heat affected zone, melted metal have different micro structures,
different grain size and hardness values which results in different yield limits, micro inclusions and
irregularities; (ii) the slope of the weld contour near the toe is highly variable but generally
supposed constant; (iii) rapid cooling after welding pass may produce residual stresses, very high,
up to the yield limit in the weld area, with a hardly predictable variability; (iv) stresses at notch root
are calculated by means of fatigue notch factor kf using empirical expressions mainly depending
from fillet radius ρ, which is highly variable along the cord and strongly affected by welder skills.
The εa strain parameter correlated to the number of cycles to failure N allows building the εa-N curves, which are fatigue strength curves in terms of strain amplitude.
From these curves, obtained for welded joints which differ in geometry and load ratio R, it is possible to determine the limit value of the strain amplitude εA corresponding to the usual life of N=2 .106 cycles (for steel) or for any other number of cycles.
The εa strain parameter correlated to the number of cycles to failure N allows building the εa-N curves, which are fatigue strength curves in terms of strain amplitude.
From these curves, obtained for welded joints which differ in geometry and load ratio R, it is possible to determine the limit value of the strain amplitude εA corresponding to the usual life of N=2 .106 cycles (for steel) or for any other number of cycles.
Online since: October 2007
Authors: Yuji Noguchi, Masaru Miyayama, Yoichi Kizaki
Potassium sodium niobate (K0.5Na0.5NbO3 : KNN) has been regarded as a promising lead-free
piezoelectric material, because of its high Curie temperature and excellent piezoelectric
properties.
1-3 However, ceramics and films of KNN suffer from a high leakage current due to lattice
defects probably originating from the evaporation of K with high volatility. 4,5
Leakage current
properties are closely related not only to defect structure in grains but also to the microstructure of
samples.
In the crystals annealed in air, a certain number of VO •• are likely to exist, probably originating from K vacancies formed during high-temperature crystal growth.
Further oxidation by the high-PO2 (35 MPa) annealing indeed decreased the number of VO •• , as expressed by VO •• + 1/2 O2 → OO* + 2 h •
In the crystals annealed in air, a certain number of VO •• are likely to exist, probably originating from K vacancies formed during high-temperature crystal growth.
Further oxidation by the high-PO2 (35 MPa) annealing indeed decreased the number of VO •• , as expressed by VO •• + 1/2 O2 → OO* + 2 h •