Context. The globular cluster (GC) system of Circinus galaxy has not been probed previously partl... more Context. The globular cluster (GC) system of Circinus galaxy has not been probed previously partly because of the location of the galaxy at −3.8° Galactic latitude, which suffers severely from interstellar extinction, stellar crowding, and Galactic foreground contamination. However, the deep near-infrared (NIR) photometry by the VISTA Variables in the Via Láctea Extended Survey (VVVX) in combination with the precise astrometry of Gaia EDR3 allow us to map GCs in this region. Aims. Our long-term goal is to study and characterise the distributions of GCs and ultra-compact dwarfs in Circinus galaxy, which is the nearest Seyfert II galaxy. Here we conduct the first pilot search for GCs in this galaxy. Methods. We used NIR VVVX photometry in combination with Gaia EDR3 astrometric features, such as astrometric excess noise and the ratio of the sum of the blue photometer (BP) and red photometer (RP) to the broad G passband (BRexcess), to build the first homogeneous catalogue of GCs in Circ...
International Journal of Engineering and Applied Sciences, May 1, 2017
There are various types of microstrip antenna that can be used for many applications in communica... more There are various types of microstrip antenna that can be used for many applications in communication systems. This paper presents the design of a rectangular microstrip patch antenna to operate at frequency range of 2 GHz to 2.5 GHz. The study involves using Matlab program in conjunction with Sonnet-Lite to obtain the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.6mm Flame Retardant 4 (FR-4) substrate with a dielectric constant of approximately 4.4, is a probe feed and has a partial ground plane. After simulation, the antenna performance characteristics such as antenna input impedance, VSWR, Return Loss and current density are obtained.
<p>Planetary science research was instituted at CBSS in 2016 with the manda... more <p>Planetary science research was instituted at CBSS in 2016 with the mandate to study the planetary activities within our Solar System. Therefore, the research activities of group were categorized into two: Environmental and Life sciences. The environmental science team studies the physical evolution of the other planets in our solar system using data from various missions like MAVEN (Mars Atmospheric and Volatile EvolutioN), while the life science team are looking at the probability of finding life elsewhere in our solar system. So far some of researches had been published by these teams, while more are various levels of development. Some of the researches are on evolutionary panspermia and meteorite sample analysis.</p> <p>Our research activities have been enhanced through collaborations such as the PAPSSN project, analysis of meteorite samples at University of Witwatersrand in South Africa etc.</p>
Observatories globally require a smooth, sustained and reliable power system for their operations... more Observatories globally require a smooth, sustained and reliable power system for their operations, which are usually, round the clock. Observatories are usually very remote sometimes at locations that are hundreds of kilometers away from power grids. This results in huge burden of extending power grids across several distances to observatories. Power interruptions are common experiences with public grids and pose great threats with gravity that can interrupt scheduled observations. Hence, there is the need for observatories to drift from the conventional power system to renewable energy system. This paper presents the design concepts and considerations for setting up a wind turbine energy system for NASRDA Centre for Basic Space Science Observatory, as a case study of the deployment of such system for remote or non-habitable observatories.
The Pan-African School for Emerging Astronomers (PASEA) is an innovative short course for African... more The Pan-African School for Emerging Astronomers (PASEA) is an innovative short course for African university students, held by an African-led international collaboration. PASEA aims to build a critical mass of astronomers in Africa and exchange ideas about teaching across continents.
The Photovoltaic (PV) systems and technology offer excellent reliability when designed with the r... more The Photovoltaic (PV) systems and technology offer excellent reliability when designed with the right implementation tools and based on good technical judgements of components that make up each of the critical sections of solar power system. The PV array is an essential section of a solar power system and it is expected to function to deliver pre – estimated power based on design estimations. There are factors that derail the performance of PV modules; the contributions of these factors are peculiar to specific sites of installation, hence the need to empirically evaluate and characterize installation sites before deployment of PV systems. This paper presents the characterization of Nsukka (South East, Nigeria) environment using decent instrumentation; and consequently highlights the power loss indicators for PV modules in the target site while presenting equally mitigable design.
Context. The globular cluster (GC) system of Circinus galaxy has not been probed previously partl... more Context. The globular cluster (GC) system of Circinus galaxy has not been probed previously partly because of the location of the galaxy at −3.8° Galactic latitude, which suffers severely from interstellar extinction, stellar crowding, and Galactic foreground contamination. However, the deep near-infrared (NIR) photometry by the VISTA Variables in the Via Láctea Extended Survey (VVVX) in combination with the precise astrometry of Gaia EDR3 allow us to map GCs in this region. Aims. Our long-term goal is to study and characterise the distributions of GCs and ultra-compact dwarfs in Circinus galaxy, which is the nearest Seyfert II galaxy. Here we conduct the first pilot search for GCs in this galaxy. Methods. We used NIR VVVX photometry in combination with Gaia EDR3 astrometric features, such as astrometric excess noise and the ratio of the sum of the blue photometer (BP) and red photometer (RP) to the broad G passband (BRexcess), to build the first homogeneous catalogue of GCs in Circ...
International Journal of Engineering and Applied Sciences, May 1, 2017
There are various types of microstrip antenna that can be used for many applications in communica... more There are various types of microstrip antenna that can be used for many applications in communication systems. This paper presents the design of a rectangular microstrip patch antenna to operate at frequency range of 2 GHz to 2.5 GHz. The study involves using Matlab program in conjunction with Sonnet-Lite to obtain the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.6mm Flame Retardant 4 (FR-4) substrate with a dielectric constant of approximately 4.4, is a probe feed and has a partial ground plane. After simulation, the antenna performance characteristics such as antenna input impedance, VSWR, Return Loss and current density are obtained.
<p>Planetary science research was instituted at CBSS in 2016 with the manda... more <p>Planetary science research was instituted at CBSS in 2016 with the mandate to study the planetary activities within our Solar System. Therefore, the research activities of group were categorized into two: Environmental and Life sciences. The environmental science team studies the physical evolution of the other planets in our solar system using data from various missions like MAVEN (Mars Atmospheric and Volatile EvolutioN), while the life science team are looking at the probability of finding life elsewhere in our solar system. So far some of researches had been published by these teams, while more are various levels of development. Some of the researches are on evolutionary panspermia and meteorite sample analysis.</p> <p>Our research activities have been enhanced through collaborations such as the PAPSSN project, analysis of meteorite samples at University of Witwatersrand in South Africa etc.</p>
Observatories globally require a smooth, sustained and reliable power system for their operations... more Observatories globally require a smooth, sustained and reliable power system for their operations, which are usually, round the clock. Observatories are usually very remote sometimes at locations that are hundreds of kilometers away from power grids. This results in huge burden of extending power grids across several distances to observatories. Power interruptions are common experiences with public grids and pose great threats with gravity that can interrupt scheduled observations. Hence, there is the need for observatories to drift from the conventional power system to renewable energy system. This paper presents the design concepts and considerations for setting up a wind turbine energy system for NASRDA Centre for Basic Space Science Observatory, as a case study of the deployment of such system for remote or non-habitable observatories.
The Pan-African School for Emerging Astronomers (PASEA) is an innovative short course for African... more The Pan-African School for Emerging Astronomers (PASEA) is an innovative short course for African university students, held by an African-led international collaboration. PASEA aims to build a critical mass of astronomers in Africa and exchange ideas about teaching across continents.
The Photovoltaic (PV) systems and technology offer excellent reliability when designed with the r... more The Photovoltaic (PV) systems and technology offer excellent reliability when designed with the right implementation tools and based on good technical judgements of components that make up each of the critical sections of solar power system. The PV array is an essential section of a solar power system and it is expected to function to deliver pre – estimated power based on design estimations. There are factors that derail the performance of PV modules; the contributions of these factors are peculiar to specific sites of installation, hence the need to empirically evaluate and characterize installation sites before deployment of PV systems. This paper presents the characterization of Nsukka (South East, Nigeria) environment using decent instrumentation; and consequently highlights the power loss indicators for PV modules in the target site while presenting equally mitigable design.
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