Joseph Amajama

• Doctor of Philosophy
• Lecturer at University of Calabar

This research investigated radio refractivity impact on signal strength of mobile communication. The mobile communication signal strengths of two popular networks in Nigeria, 9Mobile and MTN, were considered. In the 2100 MHz-3 G band, 9Mobile transmits in the downlink spectrum of 2130.00–2140.00 MHz, while MTN transmits in the downlink spectrum of...

This research focuses on developing a path loss model for radio wave signals propagating in a wavelength range of 0.37-6.12 m along some selected routes in Enugu state, Nigeria. A cable television signal strength meter was used to measure signal strength at 2 km intervals along the routes. The television signals examined were those from NTA Enugu....

In this research, we model Hulthén plus generalized inverse quadratic Yukawa potential to interact in a quark-antiquark system. The solutions of the Schrödinger equation are obtained using the Nikiforov-Uvarov method. The energy spectrum and normalized wave function were obtained. The masses of the heavy mesons for different quantum states such as...

Accurate path loss prediction is critical in television and radio broadcasting to ensure good quality of service. The path losses of Nigeria Television Authority (NTA) Channel 6 Aba in Abia State, Nigeria were investigated in this study. A digital signal strength meter was used to measure the received signal strength level (RSSL) of the channel at...

The impact of Wind on the output of photovoltaic panel and solar illuminance/intensity has been probed. The collision of the molecular particles of the air with that of the photonic particles of the sun results in a change in the propagation direction of the falling photonic particles towards the opposite direction of the incident air particles. He...

A Molecule possesses a potential energy similar to an atom (atomic potential energy) or a nucleus (nuclear potential energy). Mathematically, the molecular potential energy has been deduced to be: PE = E = nPV (in Joules); where n = number of molecules present in a specific volume (V) of the substances at a particular pressure (P) and E is the ener...

The effect of air temperature on a photovoltaic panel's outputs and its relationship with solar illuminance/intensity has been established with some mathematical models. Experiments conducted show that within the capacity of a photovoltaic panel, air temperature favours outputs. For the current, the output builds up rapidly with increasing illumina...

Experiments to probe and draw a verdict on the effect of air pressure on the output of photovoltaic panel and solar illuminance/intensity have been done. Air temperature, air pressure, relative humidity and wind speed and direction were measured intermittently in the course of daylight and simultaneously with solar illuminace/intensity and output v...

The impact of Wind on the output of photovoltaic panel and solar illuminance/intensity has been probed. The collision of the molecular particles of the air with that of the photonic particles of the sun results in a change in the propagation direction of the falling photonic particles towards the opposite direction of the incident air particles. He...

The effect of solar illuminance (or intensity) on a photovoltaic panel has been examined. Illuminance is synonymous to light intensity. Illuminance is directly proportional to light intensity per square of the distance between the source of light and object. The solar illuminance (or intensity) within the weather parameters' ranges of 77 o F – 90 o...

The power generated by a photovoltaic panel depends not only on the intensity of the sunlight, but also on the angle it is inclined towards the sun. The impact of the angle of photovoltaic panels' inclination on its output power has been X-rayed. The output registers that power performance can be enhanced when a photovoltaic panel is inclined at an...

Investigation of the effect of relative humidity on photovoltaic panel output has been studied and results from other research have been corroborated. Also, the relationship between relative humidity and solar illuminance/intensity has been deduced. At near similar values of air temperature, air pressure and wind direction: the solar illuminance/in...

The dynamics of air parameters: temperature, pressure and relative humidity on radio signal strength have been studied in the tropical city of Calabar – Nigeria. Mathematical models relating atmospheric radio wave refractivity with the weather parameters: air temperature, air pressure and relative humidity and atmospheric radio wave refractivity wi...

The bizarre design and engineering physics of two kinds of small/medium/pico/family hydroelectric power generating plants/farms have been analysed. One utilizes a stream/river with a dam constructed so that the water falls from a height and turn a turbine while, the other maximizes the energy of a falling mass of water from a reservior at a particu...

Stars have been theoretically and empirically studied. Earlier knowledge reveals that stars like the sun are a sea of mainly hydrogen and they undergo fusion to produce mainly helium, there by releasing a huge amount of energy in the form of light: but what is evident in our night sky from the idea of characteristic flame of elements when they burn...

Signal strengths measurements were obtained half hourly for some hours and simultaneously, the atmospheric components: atmospheric temperature, atmospheric pressure, relative humidity and wind direction and speed were registered to erect the effects of air density and dew point temperature on radio signals (electromagnetic waves) as they travel thr...

— The variations of tropospheric radio wave refractivities in eleven (11) cities across the rainforest and mangrove in Southern Nigeria has been examined. Data abstracted from Weather API (Weather2), Yr. no and NIMET (Nigeria meteorological agency) websites has been analyzed. Generally, there was an increase in the average tropospheric radio wave r...

This work probes the impact of major weather components on UHF radio signal. Measurements of the radio signal strength from Cross River State Broadcasting Cooperation (CRBC), (4 0 57'54.7''N, 8 0 19'43.7''E) transmitted at 35mdB and 519.25 MHz (UHF) were done in a residence along Etta-abgor, Calabar (4 0 57'31.7''N, 8 0 20'49.7''E) to ascertain the...

The variations of tropospheric radio wave refractivities in eleven (11) cities across the savannah climatic belts in Nigeria has been examined. Data abstracted from Weather API (Weather2), Yr. no and NIMET (Nigeria meteorological agency) websites has been analyzed. Generally, there was a decrease in the average atmospheric radio wave refractivities...

Signal strength from Cross River State Broadcasting Cooperation (4 0 57'54.7''N, 8 0 19'43.7''E) was measured in a residence along Etta-abgor, Calabar (4 0 57'31.7''N, 8 0 20'49.7''E) simultaneously with the meteorological components. Results indicated that signal strength is inversely proportional to atmospheric pressure; provided that, other meas...

Radio signal strengths from Cross River State Broadcasting Cooperation Television (CRBC-TV), (4 0 57'54.7''N, 8 0 19'43.7''E) transmitted at 35mdB and 519.25 MHz (UHF) were measured using a Cable TV analyzer in a residence along Etta-abgor, Calabar (4 0 57'31.7''N, 8 0 20'49.7''E) simultaneously with the meteorological components (weather parameter...

Radio signal strengths from Cross River State Broadcasting Cooperation (CRBC), (4 0 57'54.7''N, 8 0 19'43.7''E) transmitted at 35mdB and 519.25 MHz (UHF) were measured using a Cable TV analyser in a residence along Etta-abgor, Calabar (4 0 57'31.7''N, 8 0 20'49.7''E) simultaneously with the meteorological components (weather parameters). The compon...

The variance of atmospheric radio wave refractivities across the different vegetative climatic belts in Nigeria has been examined. Data abstracted from Weather API (Weather2), Yr. no and NIMET (Nigeria meteorological agency) websites has been analyzed. Generally, there was an increase in the average atmospheric radio wave refractivities as one conf...

Wind has been studied within the earth's troposphere and its effect on radio signal erected. Experiments have been carried out in a residential area (Etta-abgor) in the Calabar metropolis, Nigeria with the UHF (35mdB, 519.25 MHz) radio signal transmitted from the Cross River Broadcasting Cooperation Television (CRBC-TV) measured with a Cable-TV-ana...

The formation of rainfall has been studied empirically and theoretically within the compass of physics accompanied by a meteorological background. The study shows the energy transformations from molecular potential energy at ground level after the possession of heat from the sun to kinetic energy at the atmosphere after evaporation and the retransf...

A concise review of radio refractivity has been captured. The relationships between radio refractivity and its meteorological components have been erected. Results from half hourly measurements for 48 hrs in the Calabar Metropolis, Nigeria have shown that: radio refractivity is directly proportional to the atmospheric temperature, atmospheric press...

This paper is focused on investigating the RadioRefractivity pattern variation during the rainy season in Calabar, Cross River State , Nigeria. The daily averages of refractivity for three months of the rainy season in July, August and September, 2014 were evaluated from Metrological parameters(Temperature, Relative Humidity and Atmospheric Pressur...

The focus of this research work is to examine the variation of metrological parameters( Temperature, Relative Humidity and Atmospheric Pressure) on the troposphere as they affect the radio refractivity in the rainy and dry season in Calabar City, Cross River State of Nigeria, and also to investigate the variation in the refractivity between the two...

This work investigates the effects of Vegetation (foliage) on radio wave propagation in the Calabar metropolis, Nigeria. Measurement of the radio signal strength from Cross River State Broadcasting Cooperation Television (CRBC-TV), (4 0 57'54.7''N, 8 0 19'43.7''E) at 35mdB and 519.25 MHz (UHF) to investigate foliage loss was carried out in two fore...

The focus of this research work is to examine the variation of metrological parameters( Temperature, Relative Humidity and Atmospheric Pressure) on the troposphere as they affect the radio refractivity in the rainy and dry season in Calabar City, Cross River State of Nigeria, and also to investigate the variation in the refractivity between the two...

This paper is focused on investigating the RadioRefractivity pattern variation during the rainy season in Calabar, Cross River State , Nigeria. The daily averages of refractivity for three months of the rainy season in July, August and September, 2014 were evaluated from Metrological parameters(Temperature, Relative Humidity and Atmospheric Pressur...

Signal strengths measurements were obtained half hourly at a residential area in Calabar, Cross River State for over 24 hrs and simultaneously, the meteorological components: atmospheric temperature and pressure, relative humidity and wind direction and speed were recorded to probe the impact of the atmospheric radio wave refractivity on radio sign...

This research work is geared towards observing how the radio refractivity pattern varies during the dry season in Calabar city located in the South South of Nigeria. Metrological parameters data(Temperature, Relative humidity and Atmospheric Pressure) gotten from the Nigeria Metrological Agency (NIMET) are used to calculate the daily averages of re...