Search results

At present, both at home and abroad, the research to improve the corrosion resistance in sea water of Fe3Al mainly through the addition of alloying elements, heat treatment, and refined grains.
Fig.1 Changes in bacteria numbers in Fig.2 pH value changes of the microbial the process of immersion culture medium At the beginning of culturing, the medium pH value is about 7.24, as is shown in Fig. 2, and changed with the growth and the metabolism of microbial.
After that the number of bacterial maintained at a certain counts, pH values are relatively stable.

The overall number of primary TKRs has risen by 99.1% from 1998 to 2009, whereas the number of primary THRs has ascended by 11.3% [5].
Small spherical grains that are characteristic of films deposited by magnetron sputtering are visible on the film surface [17].

This is normally true for hydrogen that migrates between interstitial sites in a defect free lattice, but hydrogen is known to become trapped by donors and acceptors, as well as "dangling bonds" in vacancies, dislocations and grain boundaries [1].
In epi1, the 2H2/ 1H2 mixture was employed during the 2 Sample number Substrate Epitaxy Thickness [µm] B [cm-3 ] Al [cm-3 ] N [cm-3 ] 1 n-type, HTCVD epi1 380 1·10 15 <2·10 14 3·10 18 2 n-type, HTCVD epi2 380 1·10 15 <2·10 14 3·10 18 3 Semi, HTCVD, epi1 355 7·10 14 <2·10 14 <5·10 15 4 n-type, sublimation epi1 390 5·10 15 1·10 15 7·10 18 5 p-type, sublimation epi1 415 3·10 16 8·10 17 - Table 1.
On the other hand, Sample number Substrate Csurf [cm-3 ] Cmid/Csurf 2H2 "exposure" [min] Deff [cm2s-1] Csurf·Deff [cm-1s-1] 1 n-type, HTCVD 1.4·1016 0.41 25 7.5·10-8 1.1·10 9 2 n-type, HTCVD 8.5·1015 0.26 10 1.3·10-7 1.1·10 9 3 Semi., HTCVD, 9.5·1015 0.83 25 1.7·10-7 1.6·10 9 4 n-type, sublimation 2·10 15 - 25 - - 5 p-type, sublimation 1.4·10 15 1 25 - - Table 2.

The theory underlying the methodology for the calculations of the next set of MS input parameters - the number Nmeso and the bond length a of the MS beads - is similar to the classical dynamic random phase approximation (RPA) [5,6].
The polymer chains are modeled as Gaussian chains consisting of beads, each bead representing a number of monomers of the real polymer.
All MS simulations have been performed with MesoDyn, a coarse grained model for the diffusive and hydrodynamic phenomena in phase-separation dynamics [8].

With DMPA content increases, hard segments of WPUs chains increase, the Coulomb force and  hydrogen bonds between/in molecule chains increase, which make the structure of sized films close-grained, water resistance improves and Cobb value of sized papers decreases.
At the same time, the end-capping isocyanate groups increase, the number of chains increases too.
When NCO/OH molar ratio is from 1.6 to 2, NCO content increases, number of molecular chains increases, relative molecular weight decreases, particle size and viscosity decrease. 3.4.2 Effect of NCO/OH molar ratio on the properties of sized papers Table 2 shows the sized papers have good water resistance.

Danaila(1) (1)Competences Center: Interfaces-Tribocorrosion-Electrochemical Systems (CC-ITES), Faculty of Engineering, Dunarea de Jos University of Galati, 47 Domnească Street, Galați, Romania *Phone Number: +40 744216277, e-mail: Lidia.Benea@ugal.ro Keywords: biomaterial, dentistry, Co-Cr alloy, corrosion, open circuit potential, electrochemical impedance spectroscopy, cyclic voltammetry, physiological solutions, pH.
This poses new challenging problems regarding the increasing number of implants required, new diseases to be treated (e.g., Parkinson’s and Alzheimer’s) and organ shortage problems.
The samples were polished successively with waterproof abrasive paper with grain size from 320-4000 mm, with diamond paste of dimensions 3-1 μm and a suspension of SiO2 (particle size 0.04 μm) to achieve a mirror finish.

Due to the nature of the casting process, the ingot usually contains a number of defects such as porosities due to gas entrapment or improper feeding during solidification, segregations and coarse grain structure due to long cooling times.
They confirmed the importance of utilizing a V-shaped lower die, but only investigated a small number of die angles.

Nowadays a considerable number of large reservoirs have been subjected to varying degrees of waterlogging [2].
On both sides of the reservoir and its banks are sprinkled with a large number of villages and farmlands [3].
(a)NO.1 (b)NO.2 (c)NO.3 (d)NO.4 Figure 3 Moisture characteristic curve of fine grained soil Soil is saturated when Sr﹥80%, then converse the volumetric water content.

Hiroo [4], studied the coarse-graining is applied to flexible polymer chains.
(a) Model A (b) Model B (a) Model A (b) Model B Fig. 6 Network model before relaxation Fig. 7 Network model after relaxation 0 0.1 0.2 0.3 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 Segment Number Weight Fraction 0 0.1 0.2 0.3 1 4 7 10 13 16 19 22 25 28 31 34 37 Segment Number Weigth Fraction (a) Model A (b) Model B Fig. 8 Molecular weight distribution (a) Stretch Ratio 1.24 (b) 1.72 (c) 1.96 (d) 2.44 Fig. 9 Deformation process of model A 1 1.5 2 2.5 0 10 20 30 Stratch Ratio Stress [MPa] Model A Model B Fig. 10 Stress-stretch ratio curve (a) Stretch Ratio 1.24 (b) 1.72 (c) 1.96 (d) 2.44 Fig. 11 Deformation process of 5% deleted model A (a) Stretch Ratio 1.24 (b) 1.72 (c) 1.96 Fig. 12 Deformation process of 20% deleted model A (a) Stretch ratio 1.24 (b) 1.72 Fig. 13 Deformation process of 60% deleted model A Fig. 14 Change of fracture

Journal and bearing sleeve (w – groove width, dg – groove depth) - contaminants: Al2O3 powder of mean grain diameter- 21 μm, - contaminant concentration in oil - 0.5 g/l.
One can see higher number of valleys on classical journal surface with comparison to modified journals.
Smaller contaminants concentration in case of modified journal is connected with smaller number of valleys on its surface, which can be quantitatively described by larger values of the spatial parameters Sal and Str, comparing to classical journal surface.