Materials Literature
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In the article, original relations enabling the estimation of the variance of a random signal mean square value digital estimator are derived. Three cases are considered: first when the estimator is determined from quantized samples; second, when it is additionally assumed that the conditions of Widrow's theorem are s…
Rail fastenings are one of basic elements of the top structure of a track. Elastic pads are the important element of the rail fastenings. Definition of their elastic characteristics is necessary for the subsequent studying of the dynamic interaction between the track and the rolling stock.
Metamaterials (MTMs) are broadly defined as artificial composite materials specifically engineered to produce desired unusual electromagnetic properties not readily available in nature. The most interesting unusual property achievable with MTMs is probably negative refraction, which is achieved when both the permittiv…
paper discusses the problem of grain density and ferrite content in microstructure of vermicular graphite iron cast in bars of different section diameters and cylinder head casting. The experimental results regarding the section effect demonstrate that the nodule count, grain density and ferrite content are all functi…
Abstract A newly designed galvo scanner combines the advantages of closed‐loop temperature control by integrated onaxis pyrometer and fast beam deflection. It is used in quasi‐simultaneous polymer welding as well as in selective reflow soldering where several solder joints have to be processed within the working area…
L-valinium picrate, an organic material, was synthesized and grown by solution growth method. Cell parameters of the grown crystals were obtained from the single crystal X-ray diffraction analysis and the presence of functional groups was identified by FTIR study. The quality of the crystal was also examined by high-r…
We present refinements of the SIBFA (Sum of Interaction Between Fragments ab initio) and GEM (Gaussian electrostatic Model) polarizable molecular mechanics procedure to represent the intermolecular interaction energies of metal cations. Improved forces fields for closed‐shell, open‐shell and heavy metals are discussed…
Nephrogenic systemic fibrosis is a debilitating disease occurring exclusively in patients with severe renal failure. Originally it was described as nephrogenic fibrosing dermopathy. The pathogenesis of the disease is not yet known, but the observations suggest a close association with the exposure to gadolinium-contai…
Hemicellulose of Southern Yellow Pine wood spices was extracted by pressurized hot water at three different temperatures: 140°C, 155°C and 170°C. Compounding with PP (polypropylene) was performed by extrusion after preparing wood flour and sieving to determine its mesh size. The ratio of wood to polymer was 50:50 base…
Recently, material stock accounting has been of interests to investigate the potentials of metal scrap recovery in designated areas. There are two approaches, a top-down approach and a bottom-up approach, for estimating the in-use stock of materials. Top-down approach uses time-series data of consumption and trade of…
The subject of this paper is investigation of the damage level of API J55 steel, used for manufacturing casing pipes by high frequency (HF) contact welding. The analysed pipe was withdrawn after about 70 000 hours of service in an oil drilling rig. Experimental analysis included determining the mechanical properties o…
Calculations of electronic structures and optical properties of Mg (or Si) and Mn co-doped GaN were carried out by means of first-principle plane-wave pesudopotential (PWP) based on density functional theory. The spin polarized impurity bands of deep energy levels were found for both systems. They are half metallic an…
AbstrAct Purpose: In the article a state of the question concerning stresses in brazing joints of different physical and mechanical properties was appraised as well as possibility of their decrease due to use of different techniques from technological experiments to numerical methods. Evaluation of microstructure and…
Differential Scanning Calorimetric (DSC) applications in coal sciences have expanded rapidly. Various researchers observed that some of the methods to determine spontaneous heating are time consuming, tedious and do not give reproducible results. DSC instruments are usually employed under identical experimental condit…
Flower – like ZnO nanostructures have been synthesized by starch assisted sonochemical method. X-ray diffraction (XRD) pattern indicated that the synthesized flower like ZnO nanostructures were hexagonal. It is found that starch influences the morphology of ZnO structure. On the basis of structural information provide…
The Zircobase thermodynamic database for zirconium alloys coupled with Thermo-Calc software represents a powerful tool for prediction of thermodynamic and metallurgical data such as activities, formation enthalpies, phase transformation temperatures, solubility limits, existence temperature range, and chemical composi…
Comparison of two types of furniture joints namely step butt T-joints and mortise and tennon T-joints held together either by one or two welded or glued dowels showed that the shear strength results of welded dowel and glued dowel joints were comparable. For mortise and tennon T-joints there is, in general, no differe…
A short while ago the availability of silicon feedstock seemed to be the main factor limiting the photovoltaic industry. But changes in the market like the global economic recession accompanied by the financial crisis and the decision of Spain to change its feed-in-tariff policies very fast showed that there are deman…