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Journal Cover Research & Reviews : Journal of Physics
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 2278-2265 - ISSN (Online) 2278-2265
   Published by STM Journals Homepage  [22 journals]
  • Anti-synchronization of Bhalekar–Gejji Chaotic System via Nonlinear
           Active Control

    • Authors: Singh Jay Prakash, Singh Piyush Pratap, Roy B.K.
      Pages: 1 - 6
      Abstract:
      In this paper, a scheme of global anti-synchronization between two identical newly developed Bhalekar–Gejji chaotic system is proposed. This anti-synchronization scheme is achieved by using nonlinear active control since the parameters of both the systems are known and states are measurable. Lyapunov stability theory is used to ensure stability of error dynamics. Controller is designed by using the sum of relevant variables in master and slave chaotic systems. Simulation results reveal that proposed scheme is working satisfactorily.
      Keywords: Bhalekar–Gejji chaotic system, synchronization, anti-synchronization, nonlinear active control, lyapunov stabilityCite this Article
      Prakash SJ, Pratap SP, Roy B. Anti-synchronization of Bhalekar–Gejji Chaotic System via Nonlinear Active Control. Research & Reviews: Journal of Physics. 2015; 4(1): 1–6p.
      PubDate: 2018-04-21
      Issue No: Vol. 4, No. 1 (2018)
       
  • Design and Control of Conveyors with Buffer System and Integrated Drilling
           using PLC

    • Authors: Raziuddin Annsari K., Prithvi Mahabaleshwara, Kundan Kumar, Jha Dadhichi, Subhadra Binod
      Pages: 7 - 9
      Abstract:
      Conveyors are one of the most widely used means of moving the product almost everywhere. The result of design and control of conveyor with buffer system and integrated drilling system using PLC helps to solve the problem of overload of conveyor system and packaging unit, never effects the production and avoids the complete shutdown of the entire system. Conveyor system is designed such that the production rate has the maximum efficiency by keeping time constraints in mind. The shutdown problem being hindered due to malfunction of the conveyors is tackled using the buffer system and dual-speed conveyors. If one of the belt suffers from a malfunction the speed of the other belts increases so as to accommodate the extra incoming work pieces. The buffer conveyor belt gets activated when more than one output conveyor belts goes off. The intelligent distributer only distributes to running conveyors. It also provides enough time for the malfunctioned conveyors to get back to working condition without hindering the on-going process. Drilling process indicates one of the various processes that take place in the industry.
      Keywords: Buffer, production unit, packaging unit, shutdown, distributer, drillingCite this Article: Raziuddin Annsari K, Prithvi Mahabaleshwara, Kundan Kumar, et al. Design and Control of Conveyors with Buffer System and Integrated Drilling Using PLC. Research & Reviews: Journal of Physics. 2015; 4(1): 7–9p.
      PubDate: 2018-04-21
      Issue No: Vol. 4, No. 1 (2018)
       
  • Studies on Effect of Varying Geometric Parameters of Solar Receiver Tube
           on Thermal Loss Suffered By It

    • Authors: Arun Madival, Jai Kumar S., Sudeshkumar C.A., Vishalreddy ., M.R. Srinivas, M.S. Krupashankara
      Pages: 10 - 21
      Abstract:
      The radiative and convective heat losses from a solar receiver tube at a given operating temperature are a function of temperature of the outer glass envelope and outer surface area of the glass envelope. But the temperature of the outer glass envelope and its outer surface area are themselves a function of outer diameter of the heat pipe enclosed within the glass envelope and the annular gap between the outer surface of the heat pipe and the inner surface of the glass envelope. Hence the thermal losses associated with the receiver tube are a function of the size (outer diameter) of the heat pipe, annular gap between the glass envelope and the heat pipe, the operating temperature of the receiver tube. Theoretical thermal model is developed that describes various heat transfer phenomenon taking place in the solar receiver tube, under valid physical assumptions. Theoretical heat loss investigation is conducted by varying the values of outer diameter of the heat pipe (25–75 mm) and annular gap (25–75 mm) at three different operating temperatures of the receiver tube: 150, 300 and 450°C respectively, employing the thermal model developed. The radiative, convective and hence total losses associated with a solar receiver tube are quantified. The effect of varying the geometric parameters of the receiver tube on the heat loss suffered by it is studied.
      Keywords: Solar receiver tube, operating temperature, thermal losses, annular gapCite this Article:
      Arun Madival, Jai Kumar S, Sudeshkumar CA, Vishalreddy, Srinivas MR, Krupashankara MS. Studies on Effect of Varying Geometric Parameters of Solar Receiver Tube on Thermal Loss Suffered By It. Research & Reviews: Journal of Physics. 2015; 4(1): 10–21p.
      PubDate: 2018-04-21
      Issue No: Vol. 4, No. 1 (2018)
       
  • Photo-degradation in Nanocrystalline Porous Silicon

    • Authors: S.C. Agarwal
      Pages: 22 - 30
      Abstract:
      We study the metastabilities created by light soaking (LS) in nanocrystalline porous silicon (nc-PSi), prepared by the electrochemical anodization technique. At first sight, these appear similar to the effects of LS observed in hydrogenated amorphous silicon (a-Si:H) prepared by PECVD (Plasma-enhanced chemical vapor deposition) method. In nc-PSi, the ESR (Electron Spin Resonance) and Raman results indicate the presence of a-Si:H. This suggests a-Si:H as a possible cause of photo-degradation in nc-PSi. A careful look, however, reveals the differences. Amongst these is the finding that a polymer coating on nc-PSi is found to stabilize it against LS, but does so only partially for a-Si:H. This and several other experiments seem to indicate that the LS in nc-PSi affects the surface, whereas it is generally regarded to be a bulk effect in a-Si:H. We discuss these and related puzzles and suggest their possible explanations.
      Keywords: Light induced degradation, amorphous silicon, nanocrystalline silicon, porous silicon, Staebler Wronski effect, photodegradationCite this Article
      Agarwal SC. Photo-degradation in Nanocrystalline Porous Silicon. Research & Reviews: Journal of Physics. 2015; 4(1): 22–30p.
      PubDate: 2018-04-21
      Issue No: Vol. 4, No. 1 (2018)
       
  • Fabrication and Parametric Analysis of Thermal Sensing Dielectric PZT
           Thick Film Nano Ceramic Device Developed by SOL GEL Technique

    • Authors: Kushal Roy
      Pages: 31 - 37
      Abstract:
      Extensive investigation carried out during earlier half of twentieth century, prominently established that the ionic radius of an atom gets reduced to significant levels with decrease in coordination number. The findings of Goldsmith and Pauling showed that ionic radii contracts by 4, 6 and 12% when coordination number is reduced from 12 to 8, 6 and 4 respectively. It is obvious that coordination number reduction takes place at the surface partly owing to surface tension phenomena. Recent past has seen extensive study in this field as it is realized that it plays a vital role in oxygen chemisorption, hence affecting various material properties when nano scaled particle size is considered. Pb[Zrx,Ti(1-x)]O3, popularly known as PZT has remained a point of attraction for the scientists and researchers in the field of synthetically developed engineering material since its discovery by Jaffe et al. Last few decades have seen various devices like miniature relays, smart structures, memories etc., all utilizing, to a major extent the well-known piezoelectric and pyroelectric properties found in PZT. After being reported about various parametric changes in piezoelectric coefficient, polarization and dielectric constant K by addition of some foreign ions lead to the further classification of PZTs as hard and soft PZTs. As reported by various authors, soft PZTs have highly enhanced piezoelectric properties which makes them highly suitable for fabrication of various electrical and electronic devices owing to high gain and better response, but on the other hand hard PZTs are reported to have highly decreased dielectric constants and piezoelectric coefficients leading their incapability to serve as an effective material for fabrication of actuators. However a considerable linearity in the variation of K is reported in these hard doped materials, which can indirectly be utilized for other low gain and low response systems. It is also been reported that when miniaturizing a device, the grain size plays an important role in governing various parameters like dielectric constant, Curie temperature, polarization etc. of the composite material. Due to the complexity and various independent constraints involved, the origin of grain size effect is yet to be understood well . In the presented work, the author investigates the nature of variation in Curie temperature, dielectric constant, and polarization of the composite material Pb[Zrx,Ti(1-x)]O3, for x=0.6, 0.7 and 0.8 and the effect of hard dopant Mg+2, with an objective to develop a composite solid solution of hard doped PZT which can be used as a temperature sensing element, when incorporated in a capacitive arrangement using simple electronic circuitry. Some interesting results are hereby obtained when the variation of polarization, dielectric constant and Curie temperature is studied in detail with the variation in grain size.
      Keywords: PZT thermal sensors, XRD, hard doping, SOL-GEL fabrication techniqueCite this Article Kushal Roy. Fabrication and Parametric Analysis of Thermal Sensing Dielectric PZT Thick Film Nano Ceramic Device Developed by SOL GEL Technique. Research & Reviews: Journal of Physics. 2015; 4(1): 31–37p.
      PubDate: 2018-04-21
      Issue No: Vol. 4, No. 1 (2018)
       
 
 
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