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When the ultrasonic wave effect on the heat transfer medium, can also shorten the induction period of nucleation crystals, increase the nucleation rate, so in a short period of time the fluid can generate a large number of crystallites.
Suspension of a large crystallites grain growth rate becomes slow and difficult to be deposited in the tube wall , forming the heat pipe wall fouling will be greatly reduced,so as to achieve the ultimate goal of the anti- fouling , the heat transfer coefficient of heat exchanger long-lasting at a high level[7-8].
Each heat exchanger can be equipped with transducer number according to the end cap size can be free to choose the type and quantity, were installed in the outer edge of the corresponding fixed tube plate; (2) The other is the ultrasonic transducer mounted on the inlet of the heat exchanger.
Considering the characteristics and parameters of heat transfer equipment, structure, sewage flow and temperature when select the model of ultrasonic anti-fouling device and the number of transducer.

The number of point defects increased with increasing experimental temperature.
Duration of the stages of deformation of nanowires with stretching axis <100> (<010>) and <001> CuAu I at temperatures of 10, 300 and 600 K and yield stress values (max. stress on grips) Direction of applied load T, [K] Max stress on grips, [GPa] Deformation stage number I II III Duration of the stage, [ps] <100> (<010>) 10 8,5 70 225 100 <100> (<010>) 300 10,2 55 245 65 <100> (<010>) 600 11,5 50 285 55 <001> 10 14,5 58 (77) 147 50 (97) <001> 300 13,2 55 (75) 185 50 (150) <001> 600 11,6 43 (70) 157 200 (175) For defect-free nanowires <100> CuAu I, a classical inverse dependence of the maximum voltage on the captures on the temperature of the experiment is observed.
[2] Yashin A.V., Investigation of the features and stages of deformation of nanofibers of a number of metals and Ni3Al alloy based on a FCC lattice [in Russian], Thesis for a scientific degree, Altai State Technical University named by I.I.
Grain-boundary structures in polycrystalline metals at the nanoscale, Physical Review B, 62 (2000) 831-838

Quartz sand with a maximum grain size of 2.5 mm was used as aggregate.
It is obvious that the microstructure of the sample with 1% PEG is very similar to the sample with 10% PEG with approximately the same number of microcracks.
Microstructure alone provides little indication of the influence of various polymer dosages on the mechanical properties of AAS mortars but the number of microcracks was not reduced for any of applied admixtures.
Firstly, there were an increased number of calcite crystals in the AAS matrix.

For a number of practical applications, it is essential that carbon nanotubes have a low specific gravity.
To form a multilayer composite compound of the film - polymer, a medium-grained polyester polymer of the HB BODY PRO F 211 brand was used.
Clusters of carbon nanotubes have a low density and strength due to the fact that they contain a large number of pores.
In a number of cases, micro-cracks are visible.

Because of quick setting and hardening, it can construction after making floor material in number hours.It can bond firmly with various basements[2~3].This mortar has low shrink rate,high compressive strength and good abrasion resistance.So it is the development trend of ground leveling materials.
Table 2 The factor level orthogonal test Number A [C:S] B [Mx] C[Heavy calcium%] D [CA%] 1 1 2.2 10 5 2 1.33 2.5 20 10 3 1.67 2.8 30 15 cementing material:900g,water-cement ratio:0.4,Water reducer:0.6% Table 3 The result of orthogonal test Number A B C [%] D [%] Fluidity [mm] Flexural strength of 28d [MPa] Compressive strength of 28d [MPa] 1 1 2.2 10 5 167 9.10 45.35 2 1 2.5 20 10 127 8.39 42.48 3 1 2.8 30 15 80 7.30 39.61 4 1.33 2.2 20 15 60 10.36 59.45 5 1.33 2.5 30 5 150 6.82 36.77 6 1.33 2.8 10 10 60 7.34 44.74 7 1.67 2.2 30 10 75 6.93 40.97 8 1.67 2.5 10 15 80 9.80 52.15 9 1.67 2.8 20 5 90 9.24 43.73 Table 4　Intuitive analysis of fluidity of mortar Fluidity of mortar [mm] K1 K2 K3 374 270 245 302 357 230 307 262 305 407 262 220 K1/3 K2/3 K3/3 124.7 90 81.7 100.7 119 76.7 102.3 87.3 101.7 135.7 87.3 73.3 R 43 42.3 15 62.4 Table 5　Intuitive analysis of flexural strength of 28d Flexural strength of 28d [MPa] K1 K2 K3 24.79
It can make Ca (OH)2 priority into nuclear near of make heavy calcium carbonate particles.Most Ca (OH)2 growth in heavy calcium carbonate surface, and not in specific location forming local large crystal.Ca (OH)2 grain refinement, in favor of interface bonding.

SupowerTM PCD cutters with 2-30μm tool grain size and KennametalTM carbide cutters were used in the turning tests under dry or wet (water-based emulsion) cutting conditions.
Table 1 Experiments arrangement for the effect of cutting speed, tool material, workpiece material and cooling condition on the tool wear, cutting forces and cutting temperature Test number Cutting speed v [m/min] Feed rate fz [mm/tooth] Radial depth of cut aw [mm] Tool material Workpiece material Cooling condition No.1 60 0.08 0.5 PCD vol.10% (TiCp+TiBw)/TC4 dry No.2 60 0.08 0.5 PCD Wet No.3 60 0.08 0.5 WC Wet No.4 80 0.08 0.5 PCD Wet No.5 80 0.08 0.5 WC Wet No.6 100 0.08 0.5 PCD Wet No.7 100 0.08 0.5 WC Wet No.8 120 0.08 0.5 PCD Dry No.9 120 0.08 0.5 PCD Wet No.10 120 0.08 0.5 WC Wet No.11 120 0.08 0.5 PCD TC4 Wet Experimental Scheme.
This is because the number of the dislocations is larger in the matrix and hence the composite is harder when the material includes numbers of reinforcement particles [7].

The excessive rare earth content could lead to a large number of rare earth atoms deposited on the surface to form a " active rare-earth atoms stacked layer", and there are a large number of boron atoms adsorbed around layer, so it increase the resistance of boron atoms to diffuse into the surface and decrease the numbers of boron atoms reaching the surface reduce ［3］.
The wear resistance of the surface of the sample with the boronizing optimization, quenching and tempering treatment is higher than the sample with ordinary boronizing, quenching and tempering treatment, this is because the rare earth increase the Fe2B phase nucleation rate, and refine Fe2B phase grain, and improved carbonitriding layer density, increase the thickness of layer, reduce the hole and porous with osteoporosis carbonitriding layer.

Thus, the standard form of PSO could be denoted as: (1) (2) where is called inertia weighting factor and used to better control the scope of the search, R1 and R2 are two independent random numbers selected in each step according to a uniform distribution in a given interval [0,1] and C1 and C2 are two constants which are equal to 2 in this standard version.
The random number was multiplied by 2 to give it a mean of 1, so that particles would “overshoot” the target about half the time.
One approach to reduce the elapsed time is to make use of coarse-grained parallelization to evaluate the design points.
Furthermore, this part of the computational work is scalable, i.e. increasing the number of particles will cause the amount of evaluations to increase proportionally.

Introduction Although there are a large number of ABO3 simple perovskite, when one or more cations of the structure are replaced by other ones generates a group of compounds known as double perovskite, AA'BB'O3 or A2BB'O6.
This method allows to obtain material with high chemical and structural homogeneity, containing grains with controlled morphology and size, and high purity [6,7].
The synthesis performed with less air flow (3 L/min) and higher temperature (900 °C) showed a greater number of particles agglomerated and an increase in crystallite size to 14 nm.
All XRD diffraction patterns exhibited only a set of diffraction lines ascribed to SrTiO3 single phase powders, which were identified from the JCPDS card number 35-0734 with cubic symmetry and space group Pmm (221).

Fig1 is Welding joint microstructure filled in different welding materials of 1Cr18Ni9Ti and 2Cr13 steel, it is shown that the grain in HAZ zone is bigger than that in other zone of welding joint, this deduces from welding heat circulation effect[2]; the microstructure of welded joint is column crystal structure, this was rooted in quicker heat dissipation vertical to welded joint.
These samples number is same as follows.
Table 5 Elongation and reduction of area of 1Cr18Ni9Ti and 2Cr13 welding joint filled in different welding wire Number 1# 2# 3# 4# l0/mm 50.00 50.00 50.00 50.00 l1/mm 63.40 54.88 58.73 76.69 δ 26.80% 9.76% 17.46% 53.38% S0/mm 37.40 41.55 41.29 37.64 S1/mm 20.63 38.67 26.71 21.97 ψ 44.84% 6.96% 35.31% 41.63% These data can de compared horizontally on the basis of same experiment, From table5,elongation of welding joint filled in ER308 welding wire is 26.80%, reduction of area is 44.84%;elongation of welding joint filled in H1Cr21Ni10Mn7Mo welding wire is 9.76%,reduction of area is 6.96%；elongation of 2Cr13 martensite stainless steel is 17.46%,reduction of area is 35.31%;elongation of 1Cr18Ni9Ti austenite stainless steel is 53.38%,reduction of area is 41.63%.
Table 6 Strength index of welding joint 1Cr18Ni9Ti and 2Cr13 filled in different welding materials Number 1# 2# 3# 4# σb/Mp 635.70 492.34 846.03 653.70 σs/Mp 4.57 3.34 39.13 3.59 Conclusions (1)The 2mm 1Cr18Ni9Ti austenite stainless steel and 2Cr13 martensite stainless steel plates, by filling in two kinds welding wire, through TIG(DCEP), typical column crystal can be obtained in welded joint, and microstructure of welded joint is lath martensite + residual austenite + carbide