Open Access Method Article

Design of Microcontroller Based Intruder Lighting System (MBILS)

M. Olagunju, O. A. Alabi

Physical Science International Journal, Page 185-195
DOI: 10.9734/PSIJ/2015/15551

The microcontroller based intruder lighting system is an intelligent system which applies to automated lighting systems in homes, offices, industries, military zones etc. The research will feature design microcontroller based intruder lighting system that will activate light in environment in the presence of an intruder and inform the user about the coordinate position of the intruder.

The microcontroller AT89C51 and other electronic designs were employed for the above-mentioned purpose. The interfacing layer will make use of bi-directional communication in which the sensors is used as input device to receive signal when the intruder obstruct signal path while the control program will translate the received signal from the sensors to useful information and activate lighting system and camera. The camera will capture image of intruder and save to external memory. The design is to achieve energy-saving techniques and increase security strength of target environment.

Open Access Original Research Article

Effects of Temperature on the Pozzolanic Characteristics of Metakaolin-Concrete

Musbau A. Salau, Oseafiana J. Osemeke

Physical Science International Journal, Page 131-143
DOI: 10.9734/PSIJ/2015/13146

This paper focused on the thermal technique of activating pozzolanic activity of natural pozzolans, specifically calcined kaolinite clay in the form of metakaolin. The effect of heating temperatures over the range 450ºC-1050ºC in steps of 150ºC on the dehydroxylation of the kaolin and the pozzolanic activity of the resulting amorphous material were determined. The compressive strengths of metakaolin-concrete samples with 10%, 20% and 30% replacement of cement, calcined at different temperatures 450ºC, 600ºC, 750ºC, 900ºC and 1050ºC comparable to the control samples were analysed to determine the optimum temperature. Also, mixtures of mortar containing variable amounts of kaolin in the ration 5% to 30% in steps of 5% were calcined at the optimum temperature of 750ºC and investigated.

The results showed the optimum heating temperature for the kaolin to be 750ºC and the proportion of metakaolin in concrete should be 10% of the cement weight. For 10% metakaolin at temperature of 750ºC, the strengths were about 109% and 107% of normal mortar cubes at 28 days and 90 days respectively, while those of concrete cubes were 99% and 97% of normal concrete cubes. Also, with replacement proportion range of 15-25% of metakaolin (MK) in concrete, a relative concrete strength of 22.23MPa and 23.15MPa for 28 and 60 days curing ages respectively can be achieved.

 

Open Access Original Research Article

MHD Flow of Fluid over a Rotating Inclined Permeable Plate with Variable Reactive Index

Mohammad Wahiduzzaman, Md. Shakhaoath Khan, Ifsana Karim, Pallab Biswas, Md. Sharif Uddin

Physical Science International Journal, Page 144-162
DOI: 10.9734/PSIJ/2015/15194

MHD free convection, heat and mass transfer flow over a rotating inclined permeable plate with the influence of magnetic field, thermal radiation and chemical reaction of various order has been investigated numerically. The governing boundary-layer equations are formulated and transformed into a set of similarity equations with the help of similarity variables derived by lie group transformation. The governing equations are solved numerically using the Nactsheim-Swigert Shooting iteration technique together with the Runge-Kutta six order iteration schemes. The simulation results are presented graphically to illustrate influence of magnetic parameter (Μ), porosity parameter (γ), rotational parameter (R'), Grashof number (Gr), modified Grashof number (Gm), thermal conductivity parameter (Tc), Prandtl number (Pr) , radiation parameter (R), heat source parameter (Q), Eckert number (Ec), Schmidt number (Sc), reaction parameter (λ) andorder of chemical reaction (η) on the all fluid velocity components, temperature and concentration distribution as well as Skin-friction coefficient, Nusselt and Sherwood number at the plate.

Open Access Original Research Article

Effect of High Voltage on Texture, Color and Growth of Aloe vera Leaves

Faizan Ahmed Sheikh, Raminder Preet Pal Singh, Jang Bahadur Singh, Parveen Lehana

Physical Science International Journal, Page 163-168
DOI: 10.9734/PSIJ/2015/12970

With the growth in transmission lines all over the world an evident observation comes in front regarding the effect of high voltage on the plants. High-voltage transmission lines are used to transmit electric power over long distances. High voltage may have positive or negative effects on plants and other living beings. The objective of this study is to investigate the effect of high voltage on Aloe vera plants with respect to changes in texture, colour, and growth of leaves after exposure to high voltage for different durations. This plant is chosen due to its various properties and uses in dermatology. The leaves of this plant contain a soothing thick sap that is valuable for healing and curing of wounds and diseases .Images of exposed as well as unexposed Aloe vera leaves were taken and analysed over a period of ten days. Other control variables like temperature, humidity, sun light were maintained almost the same for all observations.

 

Open Access Original Research Article

Numerical Simulation and Measurement of Temperature Distribution in Water-in-Glass Evacuated Solar Water Heater

Shonhiwa Chipo, Yang Song, Baokuan Li

Physical Science International Journal, Page 169-184
DOI: 10.9734/PSIJ/2015/16328

Aims: This study focused on investigating the thermal behaviour of a water-in-glass evacuated solar heater experimentally and numerically.

Study Design: The study was carried out in three parts: numerical modelling, experimentation and validation of the numerical modelling results.

Place and Duration of Study: The study was carried out in six month at Thermophysics Institute of Northeastern University in Shenyang, China.

Methodology: A lab-scale experimental model was developed using two full scale evacuated tubes inclined 45° to the vertical and coupled to a rectangular water storage tank. Thermo resistors were connected to multi-channel data logger to record both spatial and temporal temperature distribution of the system. A three-dimensional numerical model was developed using a Computational Fluid Dynamics (CFD) package, Fluent 6.1 to investigate temperature and flow fields. This model interprets exactly the geometry of the lab-scale experimental model so that it can be validated against experimental results. A user defined function was developed to take into account the variation of incident angle with daily and seasonal movement of the sun which affects the amount of heat flux incident on the tube collector.

Results: The numerical model showed that flow in the tube is bi-filamental with the hot stream moving up the tube on the top side and the cold stream moving down the tube from the storage tank on the lower side. It also showed that the maximum temperature reached by the water in the system depends upon the amount of incident radiation.

Conclusion: The numerical model can be used for predicting temperatures in the water-in-glass solar water heaters.

 

Open Access Original Research Article

The Effect of ZnO nanoparticles Filler on Complex Permittivity of ZnO-PCL Nanocomposite at Microwave Frequency

Abubakar Yakubu, Zulkifly Abbas, Nor Azowa Ibrahim, Ahmad Fahad

Physical Science International Journal, Page 196-202
DOI: 10.9734/PSIJ/2015/16692

ZnO Nanoparticle was succesfully prepared by microwave irradiation method. The nano particles were then used as filler in the ZnO-PCL nanocomposites. The composites were prepared via the melt blend technique. The effect of the different percentages of the ZnO nanoparticles filler on the complex permittivity of the ZnO-PCL nanocomposite was investigated using themagnitudes of the reflection coefficient from the open ended coaxial sensors to determine complex permittivity of a sample under test.The different percentages used are 25%, 35%, 45%, 50% and 70% ZnO nano fillers. The result from the measurement showed that the nano filler significantly affected the value of the complex permittivity of the ZnO-PCL nanocomposites. Amongst other observations, its was found that the dielectric constant of the material under test (MUT) increases as the filler content increases. The result also showed that the dielectric constant at 8 GHz is higher than the dielectric constant at 12 GHz for all samples used. Measurement result showed that the 70% ZnO nano filler produced a mean complex permittivity of (Ɛr=4.07-j0.71).