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Online since: June 2007
Authors: Wing Bun Lee, Sandy To, Yi Ping Chen
The establishment of the above-mentioned model requires making a linear regression analysis of a large number of Taylor factors at sampling points.
The Taylor factor ( )g,DpgM is defined here as the microscopic work rate normalized by the critical resolved shear stress cτ of slip system, which is assumed to be the same for all the slip systems of all grains in the polycrystal, that is , ( )= ( ) g,D g,Dpp p g c g c M w τ & .
The strain rate tensor is written as: () ( ) 1D P N α α α γ==∑ & (14) where ()αγ& is the shear rate and N the number of slip system.
In particular, when m approaches a small value, i.e., 0.005, a strong nonlinearity with Eq.(17) is observed, and an arbitrarily chosen trial solution will make it difficult to find solutions at so large a number of sampling points (49 210 000).
Online since: September 2014
Authors: S.G. Shabestari, M.M. Tavakoli, M. Ghanbari
The key feature that permits the semi-solid shaping of alloys is a dendrite-free microstructure, with globular α-Al grains dispersed in a low melting point matrix phase [5,6], which may be handled like a solid, but flows readily when sheared.
Average length, average distance, and the number per unit area of β-needles are represented in fig 7.
In fig 7c, by increasing the iron content, the number of needles per unit area has enhanced.
Fig. 7: a) Average length of β -Al5FeSi needles (µm) b) Average distance of β -Al5FeSi needles (µm) c) Number of needles per mm² in the samples produced by as-cast, cooling slope and thixoforming processes.
Online since: October 2010
Authors: Yan Hua Sun, Xiang Hui Liu, Fa Ming Zhou
Table.1 Comparative of the farmer's income of raising chickens between the "Lihua pattern" and the "market transaction pattern" Variable sample number the means of raising chickens income( ) million yuan "Lihua pattern" 70 5.685 "market transaction" 179 0.754 analysis of means DIF=MEAN( VAR2) -MEAN( VAR1) alternative hypothesis P value Ha: DIF!
Table 2 Comparative of the farmer's income of raising chickens between the "Lihua pattern" and the "Cooperative organization + peasant household pattern" Variable sample number the means of raising chickens income( ) million yuan "Lihua pattern" 70 5.685 "Cooperative organization + peasant household pattern" 110 1.179 analysis of means DIF=MEAN( VAR2) -MEAN( VAR1) alternative hypothesis P value Ha: DIF!
Table 3 Comparative of the farmer's income of raising chickens between the "Lihua pattern" and the "company + peasant household patternv'' Variable sample number the means of raising chickens income( million yuan) "Lihua pattern" 70 5.685 "company + peasant household pattern'' 63 2.240 analysis of means DIF=MEAN( VAR2) -MEAN( VAR1) alternative hypothesis P value Ha: DIF!
A study on breach of faith question and the countermeasure of contract in the agricultural industrial production management[J].Grain question research( 2007) [3] Niu ruofeng.
Online since: February 2004
Authors: J.C. Becker, F. Catoni, Berend Denkena
The continuous process leads to alternating contact conditions, so that the number of left and right tooth flanks which are in contact with the worm changes periodically.
On the other hand the dressing spindle must be capable of delivering the necessary power even at a low number of revolutions in order to decrease the dressing speed ratio further on.
As it can be seen in Fig. 2 (bottom right), by reducing the number of revolutions of the dressing spindle nR to about 1000 min -1 and increasing the dressing speed vcd up to about 10 m/s a dressing speed ratio in the desired range of values can be set.
Thus using this kind of worms is particularly suitable and cost-effective for both finishing and, with coarse grain sizes, also for roughing operations in a small and medium batch size production.
Online since: March 2011
Authors: Jian Min Sun, Yong Feng Liu, Hong Sen Tian, Jian Wei Yang, Qin Hui Zhou
This would write the following two reaction equations: C10H8 → 10Csoot+4H2 (6) C4H2 → 4Csoot+H2 (7) kA2 =kC4H2=1.0×107exp(-5000/RT ) Both the total package reaction to remove a large number of intermediate species and reaction details, this will reduce the computation time, but also provides a determined carbon initial surface area of grain quality and simple way for follow-up of the surface growth and particle number density of the initial calculation.
The swirl was set to 0.5 times the number of revolution of the engine (r/min) which corresponds to the measured swirl.
Online since: June 2012
Authors: Jia Ming Ni, Jing Zhu Pang, Bei Zhi Li
Table 1 Calculation of the Machinability Aspect Grain Size Elastic modulus Hardness Toughness Threshold bg [μm] E [GPa] Hv [GPa] KIC [MPa∙m1/2] P* [N] ZrO2 1.5 200 12.7 10.0 976 Si3N4 0.5 - 2 290 17.5 6.8 79 Al2O3 2 - 10 303 18.9 4.0 7 SiC 4 415 23.0 3.5 2 The Threshold of the Lateral Fracture Generation.
The specific normal grinding force F’n is related to the average normal force per grit, p, as (3) where Nkin is total number of active grits per unit area, ae is the grinding depth and de is the equivalent wheel diameter [8].
According to Tönshoff et al. [9] the number of active grits per unit area can be estimated as (4) where cgw is a constant associated with the topography of the grinding wheel; vw and vs are the workpiece and wheel speeds, respectively.
Ramsdell used a numeral to represent the number of layers in the unit cell, to which is added the letter H, R, or C to specify the lattice symmetry, and to indicate a hexagonal, rhombohedral or cubic cell.
Online since: September 2013
Authors: Yun Kai Guo, Fan Zeng, Mei Qing Ding, Xiao Yan Cao, Jin Hui Zhang
The rice is mainly planted, and it is the major grain production area in Xiangtan County.
Table 1 The statistic result of the SOM content (unite: g/kg) Sample number Minimum value Maximum value Average value Standard deviation Medium value Variation coefficient 26 25.555 48.62 39.0472 6.1427 39.873 0.1573 Spectrum Data Processing.
The SPOT-5 data is inconsistent with the number of wave bands and wavelength range of the field ground object spectrum radiometer, so the measured reflectance curve shall be resampled to the wave band range consistent with SPOT-5 sensor.
is the predictive value obtained by utilizing the estimation model, is the average value, and n is the number of samples.
Online since: July 2014
Authors: Zhong Lin He, Yu Hua He, Xiao Hong Xiao
It is predicted that the total amount of data would be 40ZB by 2020, meaning that each person will possess 5247 GB data. 40ZB is almost 47 times of the overall grains of sand in the World, and if we save this 40ZB data into Blu-ray discs, the weight of the total discs would be equivalent to that of 424 Nimitz aircraft carriers.
The results of graduate admission and employment status of 2013 undergraduates Class Training plan The number of students Rate of registering for graduate exam Rate of graduate admission Rate of employment Computer science class 200901,software engineering class 200901 Normal training plan 40 22.5% 44.44% 45% Computer science class 200901,software engineering class 200901 Outstanding Engineers Training Plan 40 37.5% 66.67% 67.5% Third consideration is class autonomous learning mode guided by interests.
The number of courses completed by current computer undergraduates is close to 2 to 3 times as much as 20 years ago.
At the same time, we should realize that as the number of young teachers is increasing, it is difficult for them to acquire success in teaching, academic research, and teaching reform.
Online since: March 2015
Authors: Magdalena Popczyk, Grzegorz Dercz, Bożena Łosiewicz
They are attributed to the amorphous nature of the mentioned alloys, i.e. to the lack of local corrosion cells, the absence of grain boundaries and crystal defects which are the places attacked by the aggressive factors of crystalline alloys.
Kita [29-31] studied the mechanism of the electrolytic evolution of hydrogen in relation to the periodic changes of the overpotential in hydrogen evolution together with the atomic number of the electrode metals.
Therefore, it became more convenient to use a theoretical study about the adsorption on the amorphized surfaces with active centres having a different coordination number.
The hardness depends on the number of the phases mentioned and the size of their crystallites.
Online since: December 2011
Authors: Jerzy Łabanowski, Dariusz Fydrych, Aleksandra Świerczyńska
Whereas the complexity of phenomena taking place while forming hydrogen cracks, it can be assumed that a large number of factors affect the amount of diffusible hydrogen in welded joint and some of them are unable to be controlled.
Among other factors which can change the concentration and the distribution of hydrogen in joint is the number of beads which seem to be essential [3].
Because of the number of potential input factors, it was assumed that researches are only preliminary tests.
Covered electrodes for manual metal arc welding of non-alloy and fine grain steels.
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