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, С. , О закономерности coпрoтивления почвы вдавливанию. (On the resistance of soils to vertical pressure), Сборник трудов по земл. мех. т. III . 1956 [6

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Abstract  

Quality of several vitrified radwastes specimens was demonstrated on their hydrolytic resistance. The type of water corrosion mechanism and structural features were also elucidated. The time dependence of the corrosion process proved two subsequent mechanisms of water attack. The first stage is controlled by diffusion. Later the silicate matrix is damaged and its surface layer dissolved. Ultimately, the quality of glass is evaluated from the point of view of possible radioactivity releases.

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Motion of particles with air resistance (e.g. horizontal and inclined throwing) plays an important role in many technological processes in agriculture, wood industry and several other fields. Although, the basic equation of motion of this problem is well known, however, the solutions for practical applications are not sufficient. In this article working diagrams were developed for quick estimation of the throwing distance and the terminal velocity. Approximate solution procedures are presented in closed form with acceptable error. The working diagrams provide with arbitrary initial conditions in dimensionless form of general validity.

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environmental factors. Properties of aggregate, cement paste and aggregate–cement paste bond, and their thermal compatibility between each other greatly influence the resistance of concrete. On the other hand, environmental factors such as heating rate, duration

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Introduction The wide application of tool steels is attributed to their special mechanical properties that are required in many mechanical devices. Moreover, the oxidation resistance at high temperatures is also required in

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processes, especially the oxidation resistance [ 12 , 13 ]. The simulation procedure to enable precise evaluation of lubricant viscosity was developed by Konno et al. [ 14 ]. The authors used computational chemistry to accelerate the design of lubricants

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Journal of Thermal Analysis and Calorimetry
Authors: A. Swiderski, A. Wojtal, P. Muras, A. Mikulko, S. Wrobel, and H. Koloczek

Abstract  

The DSC method was used to study phase transitions in Rhododendron L. leaf tissues caused by temperatures below the freezing point of water. The curves show several stages of water crystallisation, demonstrating that these processes do not occur simultaneously in various types of cell organelles. Temperatures and enthalpies of the phase transitions were determined and significant changes were found in the DSC curves when the sample was repeatedly subjected to sub-zero temperature cooling and heating. Also, frost resistance of the same rhododendron taxons was studied by conductometric analysis and the DSC results were compared with the data from other laboratory studies.

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Results of theoretical and experimental investigations of the thermal behaviour of InGa-AsP/InP laser diodes with a ridge-waveguide structure are presented. It is shown that, in contrast to GaAlAs/GaAs laser diodes, most of the heat flux is carried through the InP-substrate, less than 1/4 through the ridge. The temperature rise in the active region was determined and the thermal resistance calculated for various structure and bond parameters. The theoretical and experimental results fit very well. The change of the thermal resistance compared to a norm value of 67 K/W with variation of structure parameters is discussed. It is strongly affected by the device length, the ridge width and the bonding parameters.

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Abstract  

MDF cements using the blends of sulfoaluminate ferrite belite (SAFB) clinkers and ordinary Portland cement (OPC) in mass ratio 85:15 with Al2O3, and starch, polyphosphate (poly-P) or butylacrylate/acrylonitrile were subjected to moist atmospheres (ambient, 52 and 100% relative humidity (RH)) to investigate their moisture resistance. Their chemical, thermal, electron microscopic and magnetic properties were also studied before and after moisture attack. Butylacrylate/acrylonitrile (BA/AN) copolymer was found to be the most suitable for MDF cement synthesis since the sample containing BA/AN showed the best moisture resistant. There are significant differences in scanning electron microscopy (SEM) of MDF cements before and after moisture attack and with different polymers. New data on the paramagnetic nonhysteresis magnetization curves for all the samples are observed. The MDF cements synthesized from SAFB clinker with dissolved poly-P give the best signal/noise (S/N) ratio. Three main temperature regions on TG curves of both series of MDF cements are observed. In the inter-phase section of MDF cements, the content of classical cement hydrates decomposing by 250C is increased. Combustion of organic material took place by 550C. In the temperature range 550-800C, the decomposition of CaCO3 occurs.

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Abstract  

Electro-conducting doped polypyrrole was deposited by in situ oxidative polymerisation on PET non-wovens. Thermal properties were evaluated by means of DSC and TG in nitrogen and air. Flame resistance tests reveal that coated PET fibres resist to direct contact with fire. By thermal analysis, it was found that PPy reduces the temperature at which thermo-oxidative degradation of PET occurs. Polypyrrole-coated PET non-wovens were heated above the melting point of PET for 30 min. After the heating the fibres become brittle and frail, but SEM observations revealed that they maintained their fibrous shape. A loss of chlorine was found because of intense heating.

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