Open Access Method Article

Design Analysis and Implementation of A 0.5 KVA Uninterruptible Power Stabilizer

Aghanwa Sunny, S. O. Ezeonu, S. O. Ezennaya

Physical Science International Journal, Page 1-25
DOI: 10.9734/PSIJ/2017/31535

This paper presents design analysis and implementation of a 0.5 KVA uninterruptible electronic power stabilizer (UPSz). Poor and instability of power supply delivery in Nigeria necessitated the need for a device that can stabilize voltage, protect equipment from damages and also provide power to the loads in the absences of electricity from the utility mains. This need motivated the design of a power stabilizer (UPSz). Method of Pulse with modulation (PWM) was adopted. This method is capable of modulating a varying input to a stabilized output. Two input sources were considered; a fluctuating 220 V volt mains supply and a constant 12 V battery. The 12 V battery was rectified to provide an AC power supply to the load in the absence of the utility mains. The control circuit ensured a stabilized output voltage from input range of 140 V to 260 V AC power supply which is about ±40V to the usual supply voltage from the utility mains of 180V-220V in Nigeria. Appropriate protection circuits were incorporated against surges to which ensured the safety of home/office appliances. A variac was used to obtain various AC voltage levels during the testing. The voltage and current results at different loadings (in watts) of the UPSz were obtained. These results were compared with those of commercially readily available offline UPS of the same rating. The UPSz unlike the commercially available types delivered a stabilized voltage of 220 V to different loads of 60 W to 400 W range at a fluctuating input voltage range of 140 V to 260 V. This showed that the designed UPSz is an improved and better device than the offline equivalent. Other advantages include portability (light weight) and less expensive (relatively cheap).

 

Open Access Original Research Article

Study of Sunspot Time Series Using Wavelet-based Multifractal Analysis during Solar Cycle 23 and Ascending Phase of Cycle 24

S. K. Kasde, D. K. Sondhiya, A. K. Gwal

Physical Science International Journal, Page 1-12
DOI: 10.9734/PSIJ/2017/30319

Wavelet based Multifractal analysis techniques provides a sophisticated statistical characterization of many complex dynamical phenomena related with Sun and its environment. In this work multifractal property of the Sunspot number time series, has been analyzed during Solar cycle 23 and ascending phase of Solar cycle 24 using Wavelet transform and wavelet based multifractal approach. Present analysis has been performed using the software FRACLAB, developed at INRIA and available online at http://www-rocq.inria.fr. It was found that the singularities spectrum for sunspot time series was well Gaussian in shape suggesting the multifractal characteristics of time series. Thus we conclude that the multifractal based approach provide the local and adaptive description of dynamical processes related with Sun and its climate and can be applied effectively in the study of solar activity.

Open Access Original Research Article

The Radiological Impact of a Municipal Solid Waste Dumpsite on Soil and Groundwater Using Gamma Ray Spectroscopy

G. O. Itota, A. O. Balogun

Physical Science International Journal, Page 1-6
DOI: 10.9734/PSIJ/2017/28074

The radiological impact of a municipal solid waste dumpsite on soil and groundwater in Port Harcourt municipality was investigated by gamma-ray spectroscopy. The objective of the study was to evaluate the radioactivity concentrations in soil and groundwater within the landfill. Results show that the soil and ground water have been contaminated by dumpsite emissions and radioactive materials throughout the landfill. The average value of absorbed dose rates of 52.49nGy hr-1 and 10.97nGy hr-1 were obtained for soil and groundwater respectively. The average value of dose rate equivalents of 0.46mSv yr-1 and 0.09mSv yr-1 were obtained for the soil and groundwater samples respectively. These therefore, have no immediate radiological health burden on the inhabitants who depends on the soil and groundwater for their crops and potable water supply. The monitoring of radionuclides in soil and groundwater samples is very important and the practice of planting crops by farmers and consumption of groundwater within the landfill should be discouraged to prevent inhalation and ingestion of these radionuclides in humans. However, with continuous consumption of crop products and intake of groundwater, increase in the activity concentration and dose rates of these radionuclides may occur over time, which will have adverse effects on the inhabitants.

 

Open Access Original Research Article

Quantum Probabilities and the Born Rule in the Intuitionistic Interpretation of Quantum Mechanics

Arkady Bolotin

Physical Science International Journal, Page 1-12
DOI: 10.9734/PSIJ/2017/31668

This paper presents a novel explanation of the cause of quantum probabilities and the Born rule based on the intuitionistic interpretation of quantum mechanics where propositions obey constructive (intuitionistic) logic. The use of constructive logic makes it possible (through a replacement of the concept of truth with the concept of constructive probability) to abandon the law of excluded middle in the intuitionistic interpretation.

Open Access Original Research Article

Remarks on the Significance of Pentaquark Classification

E. Comay

Physical Science International Journal, Page 1-6Q
DOI: 10.9734/PSIJ/2017/32396

The notion of pentaquark was coined about thirty years ago. During the progress of time the original meaning of pentaquark has been extended and now it is used for describing particles that belong to several distinct classes. The objective of this work is to arrange pentaquarks in four classes according to their experimentally confirmed physical properties and the corresponding theoretical basis that is used for explaining their structure.