Materials Literature
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We evaluated the size distribution of defects in three types of PAN-based carbon fibres with the different Young's modulus using the lifetime measurement of positron annihilation. It was found that the average lifetimes of positron were around 400 ps in all cases corresponding to the defect size composed by nine or mo…
There is currently a need for better vascular and cardiac repair materials. These materials must be biocompatible and resist rupture, calcification, and degradation. Materials of biological origin such as decellularised tissue have shown the most promise for achieving these characteristics; however, they still suffer…
Ce3+ and Eu2+ activated BaAlSi5O2N7 phosphors have been prepared by the modified three step solid state diffusion method. Prepared phosphors are characterized by XRD, SEM, photoluminescence and thermoluminescence techniques. Upon excitation at 234nm, Ce3+ activated BaAlSi5O2N7 phosphor shows strong emission at 360nm.…
For pressure vessels constructed with low alloy steels which operate at temperatures above 371 ̊C, the fatigue design and exemption rules provided in ASME Boiler & Pressure Vessel Section VIII are no longer applicable. High temperature structure design codes which consider creep effect at elevated temperatures have to…
Alumunium terdiri dari beberapa kelompok yang dibedakan berdasarkan paduan penyusunnya. Alumunium 5083 merupakan paduan alumunium dengan magnesium (Mg), Material aluminium 5083 mempunyai sifat tahan korosi terutama terhadap korosi air laut sehingga banyak digunakan sebagai material bangunan kapal. Perlakuan suhu dapat…
CeCu2Ge2, the magnetic counterpart of the heavy-fermion superconductor CeCu2Si2, exhibits an antiferromagnetic ground state below TN = 4.15 K with an incommensurate propagation vector of τ = (0.28 0.28 0.54). The magnetism is determined by local Ce 4f-moments and the ordering RKKY interaction as well as the onset of K…
Periodic pyramidal array patterned sapphire substrate (PSS) with various inclined facets was fabricated by wet etching. It was found that {3 17}, {4 18}, and {12 5} facets are exposed on the PSS structure after etching. GaN grown on the PSS by metal-organic chemical vapor deposition was found to have a semi-polar orie…
A shortage as well as a rise in costs for raw materials as used for production of derived timber products and fibre composites can be observed for quite some time. Especially the use of wood as energy source has led to an increased demand for cellulose raw materials. Non wood resources e.g. from agricultural productio…
We prepared CuO-Ta2O5 composite films using our simple co-sputtering method for the first time. Four specimens were prepared from an as-deposited CuO-Ta2O5 sample by cutting it using a diamond- wire saw, and the specimens were subsequently annealed at 600°C - 900°C. The X-ray diffraction and photoluminescence (PL) of…
The unique hydrothermal method and traditional sol-gel process for the synthesis of nanometre SiO2/SiC particles were comparatively studied. The sol-gel system consists of phenolic resin, ethyl alcohol (C2H5OH) and tetra-ethoxysilane (TEOS). The C-Si binary gel is obtained after the hydrolysing and drying process. Sim…
BACKGROUND AND AIM OF THE STUDY: Currently, no effective crosslinking reagents are available to treat xenogenic decellularized heart valve matrices. The study aim was to evaluate the crosslinking effect of quercetin, catechin, caffeic acid and tannic acid on porcine aortic valve matrices. METHODS: Cytotoxicity of the…
Sodium enrichment occurs on the surface of the glass that is in contact with the gas phase during the heat treatment of lead-containing glass under a reductive atmosphere. This technique was previously found to promote lead recovery in waste-glass treatment, and may be potentially applied to glasses containing other h…
Well-defined SiO 2 -coated Fe 2 Co nanoparticles can be prepared by the reduction of SiO 2 -coated CoFe 2 O 4 nanoparticles with CaH 2 even at 250 °C.
Crystalline polymers spontaneously form hierarchical structures although the precise manner in which these scales of structure are interconnected especially terms of the formation and evolution of the complete structure remains unclear. We have set out to control these scales of structure by introducing additional com…
This work focuses on the effects of different austenization temperatures on the continuous cooling transformation kinetics and the ultimate microstructures characteristics of 620 MPa grade (X90) pipeline steel. The results indicated that the austenitic state has significant influence on the diffusive transformation wi…
An ISO subcommittee was set up in 2011 to improve the existing standards and norms with respect to arctic offshore operations for the petroleum, petrochemical, and natural gas industries. Within this subcommittee, a specific working group was established to address the application of materials in the environment of th…
The results of basic dynamic elements research of filters with time-varying parameters which are low-pass filters, high-pass filters, and band-stop filters are presented. With the use of those elements more complex nonstationary structures were created. This provided the capability of forming spectral characteristics.…
The accuracy of the protein-ligand binding energy calculations and ligand positioning is strongly influenced by the choice of the docking target function. This work demonstrates the evaluation of the five different target functions used in docking: functions based on MMFF94 force field and functions based on PM7 quant…
1-D nanostructures are promising materials for development of electrochemical devices offering benefits such as fast electron transfer rates and large surface areas. Copper oxide nanofibers (CuO-NFs) synthesized by electrospinning technique and subsequent thermal treatment, were used to modify paraffin-impregnated gra…
Nanotechnology, a promising interdisciplinary science has already been adopted by various sectors like medicine, pharmaceuticals, electronics and energy. But, recently, agriculture and food science door has been opened up for allowing nanoscience and technology to revolutionize them. Due to small size, large surface t…