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1
Content available Determination of kinetic parameters of decomposition of tetrahydropyrimidine derivatives
Bhesaniya K., Patel A., Baluja S.
International Letters of Chemistry, Physics and Astronomy
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2013
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Vol. 13
23-32
EN
Some new tetrahydropyrimidine derivatives have been synthesized and their structural determination was done by IR, NMR and mass spectral data. Thermal analysis of these synthesized dihydropyrimidinthiones has been carried out by TGA and DSC techniques. From the thermograms, various kinetic parameters such as order of degradation (n), energy of activation (E), frequency factor (A) and entropy change (ΔS) have been evaluated. Further, thermal stability of tetrahydropyrimidine have been determined which is found to depend on the type of substituent present in the compounds.
2
Content available remote New bulk – bulk superconducting bearing concept using additional permanent magnets
Patel A., Pałka R., Głowacki B.A.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 6
108-110
EN
The paper deals with an improved concept of the superconducting (HTS) magnetic bearing. This new solution depends on the application of additional permanent magnet rings placed below the bulk superconductors connected with the rotor. Calculations and measurements of the levitation force between the magnetized HTS and a coaxial MgB2 hollow cylinder are reviewed, proving the validity of the concept of such a superconducting bearing.
PL
W pracy zaprezentowano zmodyfikowaną wersję nadprzewodnikowego (HTS) łożyska magnetycznego. To nowatorskie rozwiązanie polega na zastosowaniu dodatkowych pierścieni z magnesów trwałych umieszczonych poniżej masywnych nadprzewodników wysokotemperaturowych umocowanych do wirnika. Przedstawione w pracy obliczenia oraz wyniki pomiarów sił lewitacji pomiędzy namagnesowanym HTS a cylindrem z MgB2, potwierdzają zalety zaproponowanego rozwiązania.
3
Content available Microgrid-based cryogenic energy storage as a part of Intelligent Energy Infrastructure Management (IEIM)
Głowacki B.A., Tomov R., Woźniak M., Patel A., Pałka R.
Maszyny Elektryczne : zeszyty problemowe
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2011
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Nr 4(92)
13-16
EN
Integration of advanced electrical machines with electrical power systems and renewable energy is at the heart of the dedicated Liquid Hydrogen Laboratory (LHL) at the University of Cambridge. Generation, storage and use of the hydrogen in conjunction with a patented dynamic energy storage system are an integral part of the proposed combined heat and power (CHP) IEIM Project. The aim of the project is to address intelligent energy infrastructure management IEIM of a smart micro grid, which combines hydrogen and electricity. To build a powerful relational database for the entire physical infrastructure based on combined heat and power elements, a sub-system needs to be established to monitor the status of interconnectivity to the grid. This information will be mapped onto the database to provide a real-time view of the energy network's physical interconnectivity with the grid, significantly reducing the environmental impact of the total electricity supply system. Considering the nature of the heat and power elements fibre optic based sensing techniques will remotely monitor the patching fields and provide an accurate map of the connectivity and constantly monitor changes in real-time.
4
Content available remote Self-similar solution of a shock propagation in a non-ideal gas
Vishwakarama J. P., Chaube V., Patel A.
International Journal of Applied Mechanics and Engineering
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2007
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Vol. 12, no 3
813-829
EN
Similarity solutions for one-dimensional unsteady self-similar flow behind a strong shock driven out by a cylindricaI (or spherical) piston in a medium which is assumed to be a non-ideaI gas obeying a simplified van der Waals equation of state are obtained. Both the cases, when the flow between the shock and the piston is isothermal or adiabatic, are considered. It is observed that the assumption of zero temperature gradient brings a profound change in the density distribution as compared to that of the adiabatic flow; whereas the pressure and velocity distributions are little affected. Effects of the non-idealness of the gas on the flow-field between the shock and the piston are investigated. It is found that there is a decrease in the shock strength due to non-ideaIness of the gas. This decrease in the shock strength is interpreted as a result of a decrease in the compressibility of the gas.
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