Materials Literature
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Bearing steel quality has been improved over the past decades by reducing the level and the size of nonmetallic inclusions. Therefore, fatigue lifetime of bearings Is mainly governed by surface damage, such as debris denting due to foreign particles. Numerous studies have been performed to find out new steel grades or…
Low carbon bainitic steels microalloyed with Nb, Ti and V are widely used for the pipeline, construction and automobile industries because of their excellent combination of strength, toughness and weldability. Boron as another major alloying element has been also frequently used in this type of steels since the 1970s.…
Magnetic and dielectric properties of the ruthenium double perovskites R 2 MRu0 6 were studied (R=La, Pr and Nd, M=Mg, Co, Ni and Zn). For R=La, the materials with the magnetic lvf+ ions (M=Co and Ni) showed magnetic ordering and large dielectric constants ( ~5000). On the other hand, for the non-magnetic Jvf+ ions (M…
Structure of the Ag and Au dot dimers arrayed on a glass substrate was optimized to exhibit intense surface-enhanced Raman scattering (SERS) of adsorbed 4,4'bipyridine molecule in an aqueous solution. The substrates with the Ag and Au dimers show clear optical anisotropy correlated to the polarization direction of the…
The paper examines basic experimental relations and mathematical models describing the main laws of behaviour of stainless steels under intensive thermal-radiation loading, as well as the basic methodological postulates used in the program for analyzing elements and units of supporting structures under quasistatic str…
We study the equilibrium configuration of a nematic liquid crystal bounded by a rough surface. The wrinkling of the surface induces a partial melting in the degree of orientation. This softened region penetrates the bulk up to a length scale which turns out to coincide with the characteristic wavelength of the corruga…
MWNTs were modified by amphiphilic polymer poly(vinyl pyrrolidone) (PVP) with ultrasonic assistance methods.The modified MWNTs were characterized by Fourier transform infrared spectroscopy (FTIR),thermogravimetry (TG),high-resolution transmission electron microscopy (TEM) and Raman spectrum.The results show that the s…
Ca-montmorillonite was directly modified by ion-exchang method using hexadecyl trimethyl ammonium bromide. The interlamellar spacing of the montmorillonite, corresponding to the(001) plane peak, increases from 1.49 nm for the purified MMT to 2.21 nm for the organophilic clay(C16-MMT). The epoxy resin/BADK/MMT nanocomp…
Based on the rigorous coupled wave theory,the phenomenon that the zero order reflection efficiency of rectangular subwavelength grating varies with the wavelength is studied when incidence angle,azimuth and grating parameters are variant.The relatively rational parameters of grating are chosen according to the calcula…
The tire test was carried out by twelve tires, which were made of various BRs and SBRs. From these results, the overpowering correlation was glass transition temperature with abrasion resistance. Sn coupled SBR reacted with carbon black (CB), and the bound rubber was increased than that of the non-modified SBR, so the…
The crystal structure of a new bismuth aluminoborate Bi0.96Al2.37(B4O10)O is studied by single-crystal X-ray diffraction. The Bi0.96Al2.37(B4O10)O single crystals are hexagonal (space group $$P\bar 6$$ 2m). The unit cell parameters are as follows: a = b = 4.587(4) Å, c = 2.253(9) Å, α = β = 90°, γ = 120°, V = 168.60 Å…
In March 2003, the marine planktonic diatoms were collected from 27 stations around Chang Islands, Trat Province in the Gulf of Thailand. Two types of the plankton net were used as filtering 100 litres of seawater through 20 ∝m mesh size and obliquely towing 70 ∝m mesh size at 2 meters above the seafloor. The diatoms…
In this paper, premature fracture of two condylar blade plates that failed inside the thigh of two separate patients is investigated. Condylar blade plates made of 316L austenitic stainless steel are widely used for internal fixation and repair of femoral fractures in orthopedic surgery. Fracture of such plates could…
An epoxy matrix varnish, used for topping treatment of electrical machines stators, was studied. The experimental nanocomposites were prepared using the same organically modified clay varying the mixing process. The nanostructure of each material was assessed by means of WAXRD. The homogeneity at the micron level was…
The proposal of this article is to present the new design technique of N (lambda/4) sections impedance transformer using geometric interpolation.The article compares the Geometric Interpolation technique with Binomial and Chebyshev Models. The increase of bandwidth and the easiness of design are factors that distingui…
The aim here is to generalise the standard FN-type equation, so that the physical equation where the local emission current density (ECD) J is related to the barrier field F becomes clearer for metals. This is a preliminary need before the above equation can be fully linked with cold field electron emission (CFE) theo…
A technique of metallorganic chemical vapor deposition (MOCVD) of copper thin films on substrates using hexafluoroacetylacetonate-copper(I)-1,5-cyclo-octadine, , as the precursor was investigated in this study. Due to the lower grain density and larger Cu grain size from complex used in the traditional Cu-MOCVD proces…
Magnesium chips less than 1 mm sizes, which are produced by the cutting of AZ91Ca2 alloy billet, are pressed at 423K and 573K to make a preform. The preforms are extruded at 623K on the extrusion ratio of 5 and 20. Microstructure of a test piece is observed by an optical microscope. Mechanical properties, fracture str…
Raman spectra of a platinum-dispersed carbon (Pt/C) electrode in H2SO4 aqueous solution were measured at room temperature under constant electrode potential. Raman bands for disordered carbon at around 1360 and 1610 cm−1 were examined in-situ with increasing time and electrode potential. A decrease in the peak intensi…
Full-electron calculations of the electronic structure of the TiSi2 compound in the structural modification C49 are performed using the augmented-plane-wave method. The total energy, the electronic band structure, and the density of states are calculated for an extended translational unit cell Ti4Si8, which is formed…