Materials Literature
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Two water-soluble tris(2-aminoethylamine) (tren) capped iron porphyrins were synthesized. The stability of their dioxygen adducts was studied in phosphate buffer, leading to half-life times around 7 min for the oxygenated species.
Polyvinyl chloride (PVC) is a material with advantages of productivity, recyclability and economy, and that is applied to various products such as pipes, films and electric cables. On the other hand, it is limited that the PVC products are used because of excessive fear to chemical substances generated by the combusti…
The autofrettage process is a method that produces tensile plastic deformation during the overloading of a pressure vessel which reverses and becomes compressive during unloading. This process produces favorable compressive residual hoop stresses at the bore of the pressure vessel, and results in an increase in the li…
An influence of hydrostatic pressure, P , on phase transition temperature, T C , and spontaneous magnetisation, M 0 , of selected perovskite ruthenates (SrRuO3, La0.2Sr0.8RuO3, SrRu0.9Mn0.1O3, and SrRu0.9Cr0.1O3) was determined to 12 kbar. A decrease in T C with pressure was found for all of the studied samples. The M…
Why can metals or oxides form nanotubes, sometimes even chiral ones? How could silicon, which has little or no propensity for sp2 hybridization, form nanotubes akin with the well understood carbon nanotubes in which the atoms are unequivocally sp2 hybridized? It would be perhaps beneficial, if not expected, for the th…
The high temperature formability of AZ31 magnesium alloy sheets has been investigated in the temperature from 150 to 350°C. The different straining conditions have been studied by using sheet blanks with several length to width ratios, and Forming Limit Diagrams were then obtained. As expected, an increase in temperat…
Plankton and epilithon samples containing Amphora chilensis Hustedt, collected from rivers in Argentina and type material of the species, have been examined using light (LM) and scanning electron microscopy (SEM). This species has been previously recorded as fossil from a\ndesert in northern Chile and as living from a…
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…