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It is revealed that in Fe-B system alloys with boron content of 9.0–15.0 % (wt.) the formation of Fe5B3 iron boride is possible. The mechanism of formation and the temperature interval of existence of Fe5B3 iron boride in Fe-B system alloys are determined. Such thermodynamic quantities of Fe5B3 iron boride as entropy, enthalpy, heat capacity and their temperature dependence are considered. It is shown...
While working at the Research Institute of the Cement Industry (the German Cement Works Association) Paul Weber received his doctorate (with distinction) from Clausthal-Zellerfeld in 1959. His doctoral thesis was, “Heat transfer in the rotary kilns with due regard to Cyclic Processes and Phase Formation.” Weber’s investigation stands as a testament to rigorous application of first principle thermodynamics...
Developed a new method determining oil well debit using measuring outlet flow temperature values. Proposed mathematical model allowing calculate temperature profile of the fluid along well-bore for determining oil well debit, taking into consideration geothermal gradient in the rock, surrounding the well-bore. It has been shown, that unlike the existing methods proposed the new method allowed very...
Intends to explore the mechanism of mineral formation of calcium-enriched fly ash. Low-sulphur Yanzhou coal was selected as experimental coal, and experiments of characteristic of mineral component of calcium-enriched fly ash were conducted on two-stage poly-phase reaction setup. The collected fly ash samples were analyzed by X-ray diffraction. The results showed that crystal mineral of fly ash of...
Molar reaction Gibbs function change, molar reaction enthalpy change, equilibrium constant and the equilibrium partial pressure of SO2 and NO for the reaction of simultaneous removal of SO2 and NO by using NaClO/ammonia solution were calculated based on the principle of chemical thermodynamics. As can be seen from the results, simultaneous removal of SO2 and NO by using NaClO/ammonia solution is available.
The objective of this research work is to study thermodynamic behaviour of activated carbon from sewage sludge with gatifloxacin. The activated carbons we reproduced from exclusive sewage sludge by chemical -physics methods using ZnCl2 as modifier. Study results on the adsorption isotherm equations and adsorption thermodynamics at different temperatures show that (1)The interaction pattern of gatifloxacin...
We present a MEMS-based differential scanning calorimetric (DSC) device combining highly sensitive thermoelectric sensing, on-chip self-calibration, and microfluidic regulation for thermodynamic characterization of biomolecular samples on a minimized scale. The device integrates well-defined microfluidic reaction chambers and utilizes a three-dimensional structure in which a layer of resistive microheaters...
The zeolite was used to treat the groundwater. The various solutions with initial manganese (Mn2+) concentration ranging from 0.5 to 1.5mg/L were prepared in this study. The nature zeolite has cation-exchange capacity and higher absorption capacity for Mn2+ from ground water with 1.89 and 2.69 mg/g at 288 and 298K. Adsorption date were well described by the Langmuir model and the thermodynamic constants...
Transient power dissipation profiles in handheld electronic devices alternate between high and low power states depending on usage. Capacitive thermal management based on phase change materials potentially offers a fan-less thermal management for such transient profiles. However, such capacitive management becomes feasible only if there is a significant enhancement in the enthalpy change per unit...
In academic circles, there are some controversial issues at present, such as difference and relation between exergy analysis and exergy transfer, discipline belongingness of exergy transfer and so on. Taking theoretical research in depth on exergy transfer into consideration, it is necessary to clarify these problems. This paper starts with illustrating the scientific definition of energy, and then...
The renewable energy sources are becoming attractive solutions for clean and sustainable energy needs. Geothermal energy is increasingly contributing to the power supply worldwide. In evaluating the efficiency of energy conservation systems, the most commonly used measure is the energy efficiency, for indicating the possibilities for thermodynamic improvement, energy analysis is inadequate and exergy...
A clear understanding of the complicated interactions among various key ingredients of flux will be very beneficial for developing future high performance solder pastes. In this work, the group contribution method was introduced to estimate and predict the properties of compound and their interactions, especially, the chemical interactions. Based on the assumption that the effects of the individual...
The purpose of this work was to investigate the potential of the macroporous resin, H-103, in adsorbing sorbic acid. Study on adsorption thermodynamics and kinetics of sorbic acid by H-103 resin was carried out through static experiments. These adsorption processes of sorbic acid were indicative of exothermic process and physical adsorption. The adsorption of sorbic acid on H-103 resin fit well to...
Hematoporphyrin monomethyl ether (HMME) that is the second generation photosensitizers is a new and promising porphyrin related photosensitizer for photodynamic therapy and diagnosis in certain tumor. The binding of HMME to bovine serum albumin (BSA) in aqueous solution was studied using fluorescence spectra and absorption spectra. It was shown that HMME has a powerful ability to quench the BSA fluorescence...
PCB board is an important part of electronic and electrical equipment. In place of piling e-wastes, much of heavy metals in PCB boards percolate into soil, air, river etc. which is a great threaten to environment. In order to removal the hazardous materials for WEEE directive, in this paper, a study on enrichment of lead, cadmium ions by multiwalled carbon nanotubes (MWCNTs) as a solid-phase extraction...
The biosorption of arsenate and arsenite from aqueous solutions by spent grains, a by-product of the brewing process, was investigated. The effects of solution pH, contact time and temperature were studied in batch experiments. The initial removal is rapid and equilibrium was established in less than 180 min. Good correlation coefficients were obtained for the pseudo second-order kinetic model. The...
Two polymorphs of famotidine, forms A and B, were prepared. The raw material of famotidine used in this study was proved to be a form B. Each famotidine sample ground for different grinding times in a ceramic mortar was determined by differential scanning calorimetry (DSC), Raman and thermal Fourier transform infrared (FT-IR) microspectroscoies, respectively. The effect of grinding process on the...
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