Search results

For the poor grain shape, high porosity, large water absorption, lower bulk density, high crushing value, the water consumption of recycled aggregate is rather large, the strength and elasticity modulus after hardening are Low.
In order to achieve all recycling of the waste concrete, this paper get recycled waste concrete powder by grinding the grain <0.6mm, carried out series test on the recycled concrete powder and the recycled concrete mixed with recycled concrete powder instead of slag powder, to provide the basis and reference for the use.
Influence of Particle Shaping on the Workability of Recycled Coarse Aggregate Concrete, Concrete, Number 7 in 2008(Total No.225): 66-68 [5] ZHANG Da-chang，XU En-xiang，ZHOU Xu-yang.
Number 9 in 2010（Total No.251）:65-68 [6] LI Wen-xia, ZHANG Xiong, LIU Xin.
Concrete, Number 10 in 2009（Total No.240）: 60-64 [7]Huang-Tianyong, Hou-Yunfen.

Introduction The studies of the physical properties of exchange biased FeNi/FeMn structures are reflected in scientific and technical literature and summarized in a number of reviews [1, 2].
The TEM images showed that the samples obtained with substrate RF-bias are characterized by a homogeneous microstructure with grain size smaller than the grain size for the samples prepared without substrate bias (Fig. 3).
The number of regions with a Fig. 5.
As a result, the number of areas with strong antiferromagnetic anisotropy and the exchange interaction strenght increases.
Apparently, this is due to the mutual diffusion of the atoms on interface of FeNi and FeMn layers or increased roughness of the interface [10], as a consequence of the increase of grain size that reduces the exchange interaction and increases the coercive force.

This number is based on a sensitivity analysis performed repeatedly for different workpiece materials.
For 41Cr4 steel and selected values of and this number is optimal value.
View of: a) Huber-Mises-Hencky’s intensity stress for the initial stage of the process, b) graph of displacement of node number 53170 on the Y-axis Case 2:  µm, .
Kukielka, Numerical analysis of micromachining of C45 steel with single abrasive grain, GAMM 79th Annual Meeting of the International Association of Applied Mathematics and Mechanics E-Publishing (2008) Bremen
Kukielka, Numerical analysis of the influence of abrasive grain geometry and cutting angle on states of strain and stress in the surface layer of object, in J.T.M.

The microstructures of the Ti-30Nb-xZr alloys had an equiaxed grain structure, in which the needle-like α phase precipitated at the boundaries of β-phase grains, as seen in Fig. 1(c).
At higher Zr content, precipitation of α-phase also occurred in the interior of the β-phase grains.
The two Ti-30Nb-xZr alloys had smaller numbers of micropores and nanotubes on the surface (Fig. 4c and d) compared to the two Ti-30Ta-xZr alloys (Fig. 4a and b).
The size and number of micropores and nanotubes should be important for clinical biomaterials use.
The Ti-30Nb-xZr (x = 3 and 15 wt%) alloys had an equiaxed structure, with smaller numbers of micropores and nanotubes compared to two Ti-30Ta-xZr alloys.

Introduction Titanium alloys have been widely used in a large number of industrial applications due to its high specific strength, good corrosion resistance as well as its high thermal stability [1, 2].
In addition, TiAl3 is also an effective grain refiner since it acts as the nucleus of α- Al during the refinement of aluminum alloys [5-8].
One main purpose of this work is to investigate the correlation between the adhesion and atomic or electronic structures of the TiAl3/Al interface by means of density functional theory, in addition of its appeal from a basic science standpoint, the final motivation for the study is to explore the grain refinement mechanism of Al-Ti-B master alloys in the future research.
Two parameters that affect the accuracy of calculations are energy cutoff, which determines the number of plane waves in the expansion, and the number of special k points used for the Brillion zone integration.
Using x-ray diffraction measurements at a synchrotron source and a quenching melt spinning technique, the heterogeneous nucleation of Al grain is found that metastable TiAl3 phase on TiB2 surface acts as the nucleus of α-Al.

Whereas the isothermally oxidised samples exhibit surface roughening [Fig. 2 (b)], arising from the original as-deposited NiAl grains [Fig. 2 (a)], the cyclic conditions seems to promote spallation and the formation of wrinkles [Fig. 2 (c)].
The additive layer thickness decreases with the number of cycles as does the interdiffusion layer.
The drop of the Al content to reheal the oxide scale that spalls off with the number of cycles, bring about significant β to γ' transformation accompanied by volume contraction [12, 14].
It appears that isothermal conditions favour surface rumpling whereas wrinkles develop with the number of oxidation cycles.
However, the wavelength remains close to the original NiAl grain size.

Alumina balls were selected so that certain similarities can be established with the well-accepted PEI (Product Enameler Institute) method, where gloss loss is measured in terms of the number of revolutions of steel balls and alumina powder in a wet environment.
According to X-ray diffraction, no evidence was found for the presence of crystalline mullite grains.
As more energy is deposited on the surface of the tiles, the microstructure evolves into a more compact matrix, reducing the number of pores.
However, although the pores are greatly reduced, there is an increase in the number and length of cracks, which were not present in the untreated sample.
Only the latter two can be applied to our materials due to the absence of mullite grains.

Most of the melilite is formed as head to head structure, the grain size generally is 0.026mm.
The crystalline phase is melilite crystallite, formed as interwoven, fibrous structure, and the grain size is 0.026mm.
The melilite is formed as feathery, interwoven and head to head structure, and the grain size is 0.56mm to 1.51mm, corrosion structure can be seen in local.
All the crystalline phase of slag film numbered D is melilite after adjusted to, and have small crystallization granularity.
Cuspidine appeared in the slag film numbered C, its melting point is high and friction is strong.

It can partly attributed to limited number of slip system of IMC a great aberrance to lattice structure [6].
As mentioned above, B2 phase is ductile theoretically but recent study implied that the ductility of B2 based alloys is mainly decided by the grain size.
TABLE 1 Nominal Chemical Compositions of the Alloys and lattice parameter Concentrations of ingredients of alloys in atomic percent、lattice parameter and phase Serials number Nb Ti Al B2/βphase lattice parameters Deviation phase a Nb-50Ti 50 50 — a=3.283 Å ±0.0005 Å B2/β b Nb-40Ti-15Al 45 40 15 a=3.305 Å ±0.0012 Å B2/β c Nb-50Ti-15Al 35 50 15 a=3.267 Å ±0.0013 Å B2/β d Nb-40Ti-10Al 50 40 10 a=3.302 Å ±0.0006 Å B2/β e Nb-39Ti-18Al 43 39 18 a=3.279 Å ±0.0006 Å B2/β f Nb-55Ti-22Al 23 55 22 a=3.280 Å ±0.0009 Å B2/β and O g Nb-25Ti-15Al 60 25 15 a=3.318Å ±0.0016 Å B2/β h Nb-15Ti-15Al 70 15 15 a=3.294Å ±0.0006 Å B2/β i Nb-20Ti-20Al 60 20 20 a=3.280 Å ±0.0006 Å B2/β and δ Result and analysis A．Microstructure i h g e d f c b a Fig. 1 Optical microstructure of the alloy Microstructures of nine Nb-Ti-Al based alloys were investigated by optical microscope.
By analyzing the grain orientation of the triple junctions; boundary energies of most grains are almost same.
Because in BCC crystal consisted of the same atoms, the reflection planes of h+k+l=odd number are systematic absence to X-ray diffraction.

The hardware facilities, experimental equipments and the number of instruments have a substantial increase.
And a large number of culture solutions and culture mediums which was harmful microbes (such as e.coli, dung escherichia coli and so on) with high concentration produced in the biological monitoring laboratory.
Or for instance the treatment of mercury grain, it can gather in mercury grain with burette firstly.
Then it spreads a layer of sulfur powder on the place remaining mercury grain.
Try to avoid the failure of large number of chemical reagents, which can save the cost.