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Online since: November 2010
Authors: Xu Yang, Lu Qian Gong, Liang Qiao, Tao Wang, Fa Shen Li
There have been a significant number of published papers focusing on the influence of electrodeposition parameters on Ms and Hc of Fe-Co films [7-11].
As can be seen from the SEM graphs, the grain size of Fe52Co48 film deposited at 15 oC is much larger than that at 30 oC, while the Fe52Co48 film deposited at 30 oC is uniform and compact compared to that at 15 oC.
As can be seen from the SEM graphs, the grain size of Fe52Co48 film deposited at 15 oC is much larger than that at 30 oC, while the Fe52Co48 film deposited at 30 oC is uniform and compact compared to that at 15 oC.
Online since: October 2010
Authors: Amitava Ghorai, Rabindranath Singh, Mrinal Kanti Hota, Dhananjay Bej
Some examples of intrinsic defects are vacancy, interstitial, dislocation, grain boundary, stacking fault, etc.
Thus the number of dipoles decreases with the increase of lamp black carbon doping and we may say that the mixture of lamp black carbon and paraffin wax produces some conducting paths within it for which the specimen looses its dielectric property.
Thus the number of dipoles decreases with the increase of lamp black carbon doping and we may say that the mixture of lamp black carbon and paraffin wax produces some conducting paths within it for which the specimen looses its dielectric property.
Online since: September 2013
Authors: Hae Yong Cho, Dong Bum Kim, Jin Gun Park, Hyuk Soo Shin, Won Yeong Kim, In Hwan Lee, Jung Kil Lee
As a result of comparative analysis for number of analyzed molding results about AISI 304 stainless steel depending on various conditions, a angle of incline(β) 7.5˚ and wagon velocity(Vp) 8mm/s are set as optimal value.
So, when velocity of thermal activated mechanism quicken, slip of grain boundary is activated by molding temperature and cyclic load.
So, when velocity of thermal activated mechanism quicken, slip of grain boundary is activated by molding temperature and cyclic load.
Online since: January 2013
Authors: Kyu Hong Hwang, J.K. Lee, W.U. Park, J.M. Zhao, T.S. Kim, C.H. Yu
.%]
ZrO2 94.2%, Y2O3 5.3%
Al2O3 99.1%
Density [g/cm3]
6.1 (tetragonal)
3.98
Middle Grain size [μm]
0.3
0.5
Bending strength [MPa]
800
480
Wickers Hardness [HV]
1200
2400
Elastic modulus [GPa]
210
380
The sintering temperatures were 1500 and 1550 oC for 5, 30, and 60 min in the conventional furnace, and were 1450 and 1500oC for 5, 30, and 60 min in a microwave furnace.
The fractured surface of the specimen was measured and microwave observations of the microstructure of the specimens without pores showed dense tissue (Fig. 4, M2), and the typical microstructure of the specimens by conventional sintering still had a large number of pores (Fig. 4, C2).
The fractured surface of the specimen was measured and microwave observations of the microstructure of the specimens without pores showed dense tissue (Fig. 4, M2), and the typical microstructure of the specimens by conventional sintering still had a large number of pores (Fig. 4, C2).
Online since: December 2005
Authors: Giuseppe Pezzotti
Several studies have been published of local defects and discontinuities (including grain-boundaries,
p-n junctions, precipitates or inclusions), variations in impurity concentration and in the energy
band gap with composition in mixed crystals, states in the energy gap and excess carrier diffusion
lengths by the voltage dependence of selected luminescence band intensities.
Assessments of the diffusion length of electrons in solids can be given according to the Kanaya-Okayama range-energy relation [7]: (A)(A)(A)(A) (B)(B)(B)(B) (C)(C)(C)(C) R = 9/8 3/56 1076.2 Ν ΑΕ − ρ x (3) where R (in cm) is the broadening range of the irradiated electrons, Ν is the atomic number, Ε (in kV) is the accelerating energy of the primary electrons, Α is the atomic weight, and ρ (in g/cm3) is the material density.
Assessments of the diffusion length of electrons in solids can be given according to the Kanaya-Okayama range-energy relation [7]: (A)(A)(A)(A) (B)(B)(B)(B) (C)(C)(C)(C) R = 9/8 3/56 1076.2 Ν ΑΕ − ρ x (3) where R (in cm) is the broadening range of the irradiated electrons, Ν is the atomic number, Ε (in kV) is the accelerating energy of the primary electrons, Α is the atomic weight, and ρ (in g/cm3) is the material density.
Online since: November 2012
Authors: Xu Guang Yang, Bin Zhou
The glassware during this period is small in number and simple kind, only having casing glass beads shaped like the eyeball of a dragonfly, and small pieces of glass embedded in the sword.
With its unique shape [5] and irregular grains, it fully displays glass irregularity that is naturally formed and colors with great texture, and creates a pleasant artistic atmosphere.
With its unique shape [5] and irregular grains, it fully displays glass irregularity that is naturally formed and colors with great texture, and creates a pleasant artistic atmosphere.
Online since: February 2014
Authors: Lenita Herawaty, Eti Rohaeti, Charlena Charlena, Sulistioso Giat Sukaryo
The mechanical properties of HAp are affected by the powder form, pores, grain size, particle size and fabrication methods.
Figure 4 depicted the particle size and size distribution by number of the product.
Figure 4 depicted the particle size and size distribution by number of the product.
Online since: October 2013
Authors: Xiao Hui Zhao, Yu Liu
Introduction
Surface nanocrystallization treatment provides machinery parts with a surface nanocrystalline layer and a coarse-grained interior.
(1) Where, A0 is the constant term; n is the number of harmonic; an and bn are the amplitudes of harmonic; w is the angular frequency of impact wave.
(1) Where, A0 is the constant term; n is the number of harmonic; an and bn are the amplitudes of harmonic; w is the angular frequency of impact wave.
Online since: October 2011
Authors: Shou Xu Song, Jian Hu, Zhong Wei Wu
Introduction
Thermosetting plastics are widely used in all military and civilian industry with advantages of specific strength, light weight and durability; meanwhile, a large number of thermosetting plastic wastes are accumulated.
Chengdu;FA-B series of electronic analytical balance, Shanghai Precision Scientific Instrument Co., Ltd. 1.2 Experimental procedures (1) Cleaning and drying out the waste thermosetting phenol-formaldehyde resins; (2) Cutting the phenol-formaldehyde resins into small pieces with the particle of 0.5 ~ 1cm; (3) Adjusting the machine parameters, pulverizing the small pieces of phenol-formaldehyde resins; (4)Dividing pulverization time into 5min, 10min, 15min, 20min, 25min, 30min, collecting the product after crushing separately, screening them with the vibrating screening machine, measuring the percent of mass of every grain particle, and recording the data. 1.3 Experimental data Table 1 Crushed product size distribution Oversize Pulverization Productivity time Particle /μm 5min 10min 15min 20min 25min 30min >250 180-250 120-180 96-120 75-96 <75 40.44 13.2 8.53 10.94 4.51 22.37 33.86 11.81 8.01 9.32 3.28 33.73 27.43 10.1 7.72 8.79
Chengdu;FA-B series of electronic analytical balance, Shanghai Precision Scientific Instrument Co., Ltd. 1.2 Experimental procedures (1) Cleaning and drying out the waste thermosetting phenol-formaldehyde resins; (2) Cutting the phenol-formaldehyde resins into small pieces with the particle of 0.5 ~ 1cm; (3) Adjusting the machine parameters, pulverizing the small pieces of phenol-formaldehyde resins; (4)Dividing pulverization time into 5min, 10min, 15min, 20min, 25min, 30min, collecting the product after crushing separately, screening them with the vibrating screening machine, measuring the percent of mass of every grain particle, and recording the data. 1.3 Experimental data Table 1 Crushed product size distribution Oversize Pulverization Productivity time Particle /μm 5min 10min 15min 20min 25min 30min >250 180-250 120-180 96-120 75-96 <75 40.44 13.2 8.53 10.94 4.51 22.37 33.86 11.81 8.01 9.32 3.28 33.73 27.43 10.1 7.72 8.79
Online since: February 2012
Authors: Yi Tao Yang, Zhi Ying Ma
Table 1 The serial number and chemical composition of little scale casting steel samples(wt%)
Serial
C
Si
Mn
Mo
Ni
Nb
1
0.104
0.434
1.34
0.299
0.205
0.018
2
0.085
0.408
1.32
0.294
0.39
0.018
3
0.093
0.442
1.41
0.299
0.59
0.020
4
0.102
0.442
1.41
0.493
0.192
0.019
5
0.105
0.432
1.41
0.491
0.387
0.018
6
0.106
0.460
1.85
0.596
0.730
0.025
7
0.110
0.482
1.54
0.734
0.194
0.023
8
0.093
0.450
1.38
0.696
0.463
0.017
9
0.121
0.482
1.53
0.719
0.547
0.020
Table 2 Heat treatments condition
Heat treatment
Homogenization annealing
normalizing
Condition(℃, h)
1000℃,1.5h/ Furnace cooling
920℃,1h/ Air cooling
Experimental method.
From the EDS analysis results shown in Fig. 7, the elements distributed uniformly, despite of the alloy elements enriched in the grain boundaries of ferrite. 50μ 50μ 50μ No.1 No.5 No.9 Fig.6 The optical microstructure of samples No.1 No.5 No.9 Fig.7 The SEM microstructure and EDS analysis of samples Conclusions The aforementioned results and discussions leaded to the following findings: (1) Tensile strength and hardness of the casting steel improved, elongation dropped with the increasing Mo content.
From the EDS analysis results shown in Fig. 7, the elements distributed uniformly, despite of the alloy elements enriched in the grain boundaries of ferrite. 50μ 50μ 50μ No.1 No.5 No.9 Fig.6 The optical microstructure of samples No.1 No.5 No.9 Fig.7 The SEM microstructure and EDS analysis of samples Conclusions The aforementioned results and discussions leaded to the following findings: (1) Tensile strength and hardness of the casting steel improved, elongation dropped with the increasing Mo content.