an aluminum foam product characterized by no free-bubble layer, uniform bubble distribution, pore sizes of 2-5mm and porosity of 60%-80% can be obtained under the conditions the foaming temperature 740℃, foaming agent addition 1.40%- 2.20%, stirring time 3min and foaming time 5min.
Crystals are SiO2,Al2SiO5 and Na2Ca2(SiO3)3 with average bubble diameter 2.039mm,density 0.65 g/cm3,thermal expansion coefficient 115.6×10-7/℃,compression strength 7.31MPa and bending strength 5.83Mpa under temperature of 725℃ and holding time 25min.
Crystals are SiO_2, Al_2SiO_5 and Na_2Ca_2(SiO_3)_3 with average bubble diameter 2.039mm,density 0.65g/cm~3, thermal expansion coefficient 115.6×10~-7/℃,compression strength 7.31MPa and bending strength 5.83MPa under temperature of 725℃ and holding time 25min.
Crystals are SiO2 Al2SiO5 and Na2Ca2(SiO3)3 with average bubble diameter 2.039mm density 0.65g/cm3 thermal expansion coefficient 115.6×10-7/℃ compression strength 7.31 MPa and bending strength 5.83 MPa under temperature of 725 ℃ and holding time 25 min.
the ratio of sustained filtration bubble of TS group at 7d, 1, 6, 12 and 24mo were 195/197, 113/152, 60/137, 47/62 and 33/46 respectively, while those of NPTS group were 25/25, 17/23, 12/19, 5/9 and 5/9 respectively.
Experimentai results show that high quality 3μ bubble films can be obtained with proper selection of the molar ratio of Lu_2O_3/Sm_2 O_3 and CaO/CaO + GeO_2·The temperature stability of the small bubble material can be greatly improved with the substitution of Gd~(3+) ions.
The effects of stir velocity, slurry viscosity and density on the porosity were studied and the porosity was characterized by using the Reynolds number according to the bubble forming theory in this paper.
With the material of hawthorn, the low alcoholic bubble wine is fermented by adding the grape yeast imported from France, and the low alcoholic degree is 5%(v/v), the general surgar beyond 50, general acid(g/mL)is 0.8~1.0. The pressure of CO2 in the bottle in 20℃ is beyond 0.3 MPa. And all of these obey the standard of national bubble wine.
the cost of a transposition of length l is f(l)=l~α,α>0,rather than 1.Approximation algorithms are given for 0<α<1 and 1<α<2 respectively,and bubble sort is proved to be an exact algorithm for this problem when α2.The results have direct applications in computational biology to the field of comparative genomics.
It produced no air bubble in the adhesives layer under the condition of no vacuum environment, and ensures the assembly dislocation ?0.
This paper attempted to numerically analyze the action process based on damage mechanics when a jet created by bubble collapse acted on the bearing surface in the process of cavitation erosion.
An effective medium method is developed for the slightly compressible elastic media permeated with air-filled bubbles, according to the nonlinear oscillation of the bubble, which happens when compressional wave travels through the porous media.
Two flow regimes were discovered by measuring flow rate vof water through thin capillaries containing small gas bubble.
The longer the bubble, the greater this contribution.