Mr. MORKA JOHN CHUKWUEMEKE
Publication Title • Growth and Characterization of Dye-Sensitized Solar Cells using Dyes from MangiferaIndica, ManihotEsculenta and Hibiscus Sabdariffa Leaves by Sol-Gel Technique
Publication Type journal
Publisher JASEM electronic 2659-1502
Publication Authors • MORKA, JC; OTTIH, IE; UMEOKWONNA, NS
Year Published 2022-11-30
Abstract Three natural dyes, extracted from leaves of MangiferaIndica, ManihotEsculenta and hibiscus sabdariffa were used as sensitizers to fabricate dye-sensitized solar cells. The Sensitization performance related to interaction between the dyes and titanium (iv) oxide (Ti02) surface were evaluated under 100mW/cm2 light intensity. The photoelectrical performance of the DSSCs based on these dyes show that the V0c ranged from 0.300 to 0.477V and Jsc was in the range of 0.00011 to 0.0102mA/cm2. The DSSC sensitized with MangiferaIndica leave extract offered the best photosensitization effect, and had the highest photoelectrochemical performance. The SEM result TiO2 sample revealed that the surface of the TiO2 was porous with particle agglomeration. The EDX showed quantitative results and elements present as titania (70.33, weight %), oxygen (15.30, weight %), nitrogen (10.24, weight %) and carbon (4.13, weight %).
Publication Title DAY -TO- DAY - VARIABILITY IN SOME IONOSPHERIC PARAMETERS IN THE QUIET EQUATORIAL IONOSPHERE (CASE STUDY: foF2)
Publication Type journal
Publisher Nigerian Academic Forum: A multidisciplinary Journal.
Paper Link www.oasisresearchjournals.com
Publication Authors J. C. Morka and D. N. Nwachukwu
Year Published 2012-02-16
Abstract • The F2 region of the Ionosphere is a complex one. There are large irregular changes of foF2 from day - to - day. This paper discusses the diurnal and seasonal variations of foF2. While the diurnal variation of foF2 has a maximum value at a time far from mid-day, the seasonal variation curve has two maximum points in the months of March and November respectively, with a minimum in July. Thus, indicating that the seasonal variation of foF2 is a semi - annual one. It was also shown that for short time variations, the day-to-day variability in foF2 is neither due to season nor relative sunspot number, Rz. The test of significance between the standard errors of foF2 before and after correction for season and Rz show no significant difference at 95% level of significance.
Publication Title Physicochemical Assessment of Aquifers in Agbor Metropolis, Delta State, Southern Nigeria
Publication Type journal
Publisher Faculty of Engineering, University of Benin. ISSN 2635-3350 (E)
Paper Link www.rjees.com
Publication Authors Okwagi, P., Amitaye, A.N., Molua, O.C., Morka, J.C. and Anigoro, F.O
Year Published 2019-12-30
Abstract Water Pollutants may be physical or chemical and may pose health hazards to human and livestock when used for drinking and other domestic purposes. Hence, the physiochemical characteristics of aquifers from various locations in Agbor metropolis were determined to ascertain their suitability for domestic uses. A total of eighty-four (84) water samples: twenty- eight (28) per month, was collected in the months of October, November and December, 2018 and analysed using standard methods for water and wastewater analysis. The results of the study revealed that the aquifers are soft, fresh, and contaminated with heavy metals: Fe (0.00-0.70 mg/l), Cr (0.00-0.11 mg/l) and Mn (0.00-0.50 mg/l). The hardness values ranged from 16.00 to 126.00 mg/l and 30.00 to 640.00 mg/l for borehole and well water samples respectively. The electrical conductivity (E.C.) values range from 9.56 to 181.30 pScrn1 for the borehole water samples while that of the well water samples range from 3.65 to 58.00 pScm-1. The DO values range from 2.30 to 78.03 mg/l and 2.60 to 6.10 mg/l for borehole and the well water samples respectively. It is recommended that these water sources be protected from further contamination. Also, bacteriological assessment of these aquifers should be carried out in the identified sample locations since Mn and Cr contaminations are indicators for microbial contamination
Publication Title Review on the Use of Dyestuff for Enhancement of Dye-Sensitized Solar Cell Efficiency
Publication Type journal
Publisher Journal of Applied Sciences and Environmental Management (JASEM) electronic
Publication Authors UKPENE, AO; MORKA, JC; MOLUA, OC.
Year Published 2022-08-26
Abstract Dye-sensitized solar cells (DSSCs) have high energy conversion efficiency and environmental friendliness. Consequently, the aim of this paper is to review the use of dyestuff for the enhancement of dye sensitive solar cell efficiency. For this reason, this paper gives a background of dye stuff, types and limitations and investigates the important criteria which are considered for selecting dye to enhance DSSC efficiency.
Publication Title Experimental Study Corrosion Parameters of Copper as an Eco-Friendly Heat Collector for Solar Water Heaters
Publication Type journal
Publisher Journal of Geography, Environment and Earth Science International
Publication Authors J. C. Morka a , O. C. Molua a* , A. Egheneji a , M. Edobor a and F. C. Ighrakpata
Year Published 2023-06-26
Abstract ABSTRACT
The corrosion behaviour of copper as a solar collector material was adequately simulated in tests in
a solar water heating system. The weight loss technique of corrosion determination was used under
exposure conditions ranging from slightly acidic to alkaline. Uniform corrosion was observed and
corrosion rates; calculated estimates of the life of a typical collector made of copper were evaluated
and found to be below 0.0254 mmpy and the subsequent evaluation of the life of a 3mm thick pipe
shows lives of over a hundred years under the varying exposure conditions. A significant fact is that
uniform corrosion took place over the period of the test.
Publication Title Day-To-Day Variability in Some Ionospheric Parameters in the Quiet Equatorial Ionosphere Case Study: Ionospheric Critical Frequency Of The E-Region, Foe
Publication Type journal
Publisher International Journal of Trend in Research and Development, Volume 3(5), ISSN: 2394-9333 www.ijtrd.com
Paper Link www.ijtrd.com
Publication Authors 1Morka J.C, Molua O.C and Nwachuku D.N
Year Published 2016-09-21
Abstract Abstract-- Day-to-Day Variability is some ionospheric
parameters in the quiet equatorial ionosphere, case study: foE
is hereby presented. The diurnal variation curve of foE showed
a symmetrical one with a peak value at noon. The seasonal
variation curve of the foE has two maximum points in the
months of April and August. It is also shown that for short
time variation, the day-to-day variability in the E-region of the
ionospheric critical frequency, foE is not due to season nor
relative sunspot number Rz. The test of significance carried
out between the standard errors of foE before and after
correction showed no significant difference at 95% level of
significance.
Publication Title DEALING WITH ENERGY CHALLENGES BV NIGERIA THROUGH RENEWABLE ENERGY SYSTEMS
Publication Type journal
Publisher Chukwuemeka Odumegwu Ojukwu University, Uli
Paper Link http://www.coou.edu.ng/
Publication Authors John Morka & Ottih I.E
Year Published 2022-02-26
Abstract Abstract
Even though Nigeria is rich in energy resources, it has not meaningfully taken advantage of
these resources 10 mate adequate, affordable sustainable and reliable supply of energy
available to its citizens in order to meet the three element* of the sustainable development
goals i.e economic, social and environment. No doubt, this has become a huge chai.?'_~r This
paper therefore examines these available energy resources and elaborately shed more light on
how Nigeria can harness the available renewable energy to effectively and efficiently deal with
the energy challenges being faced by it.
Publication Title ENVIRONMENTAL AUDIT REPORT OF UNIPETROL INSTALLATION LOCATED AT APAPA, LAGOS NIGERIA: CASE STUDY -EFFLUENT AND POTABLE WATER DISCHARGES
Publication Type journal
Publisher Oasis Journal
Paper Link Oasis Journal
Publication Authors John Morka & Awatefe J. K
Year Published 2010-12-30
Abstract Abstract
Environmental audit, EA, is one of the available enforcement tools used as agent of
sustainable growth comprising a systematic, documented, periodic and objective
evaluation of the process technology, equipment performance, raw materials in use,
quality and quantity of wastes generated, and their effects on the air, soil, vegetation,
underground and surface water, with the aim of facilitating management control of
environmental practices and assessing compliance with company’s policies and
meeting regulatory requirements. This paper therefore reports the environmental
auditing of the effluent and potable water discharges at Unipetrol’s Apapa
Installation. The results show that the effluent from the separator pit has high Total
Hydrocarbon Content (THC), mean value is 13.13 Mg/l, Oil and grease, mean value
is 25.82 mg/L, Biochemical Oxygen Demand (BOD), mean Value is 169.44 mg/L and
Chemical Oxygen Demand (COD), mean value is 252.32 mg/L. These values were
above statutory limits and therefore requires that control measures be taken to
forestall pollution
Publication Title Environmental Audit of Camelite Paint Manufacturing Company Located at Agbor, Delta State, Nigeria. Case Study: Analysis of Effluent/Borehole water Discharge
Publication Type journal
Publisher International Journal of Advances in Engineering and Management (IJAEM)
Publication Authors J. C. Morka1 , C. O. Molua2 , D. N. Nwachuku3 , D. A. Ogwu4 and A. O. Ukpene
Year Published 2021-05-20
Abstract ABSTRACT: An Environmental Audit (E.A)
study of physiochemical and bacteriological
effluent and borehole discharges of Camelite paint
Manufacturing company limited, Agbor was
investigated. pH was determined using the pH
meter pre-calibrated using buffer 4 and 9. TDS
contents were estimated using Lovibond
conductivity meter. Heavy meal concentrations
were determined with Spectra AA varion 400 plus
Atomic Absorption Spectrometer. Total aerobic
bacterial counts were determined by the pour-plate
technique technique. Total coliform counts were
determined by the Most Probable Number (MPN)
technique. The study revealed low pH, low TDS
and small quantities of cations and heavy metal
presence, and high total coliform bacteria counts of
42.2MPN/100ml which contributed to the
bacteriological pollution of rivers and coastal
waters resulting in limited possibilities of their use
for recreation. It is suggested that to detect coliform
organisms in water, either the multiple tubefermentation-technique or the use of the Membrane
Filter be employed because of the disadvantages
associated with the so called Most-ProbableNumber technique whose test is not sensitive to
large fluctuations in coliform densities.
Management of Camelite should consider pollution
abatement and ensure compliance with
environmental requirements.
Publication Title Environmental Audit of Camelite Paint Manufacturing Company Located at Agbor, Delta State, Nigeria. Case Study: Analysis of Effluent/Borehole water Discharge
Publication Type journal
Publisher International Journal of Advances in Engineering and Management (IJAEM)
Publication Authors J. C. Morka1 , C. O. Molua2 , D. N. Nwachuku3 , D. A. Ogwu4 and A. O. Ukpene
Year Published 2021-05-20
Abstract ABSTRACT: An Environmental Audit (E.A)
study of physiochemical and bacteriological
effluent and borehole discharges of Camelite paint
Manufacturing company limited, Agbor was
investigated. pH was determined using the pH
meter pre-calibrated using buffer 4 and 9. TDS
contents were estimated using Lovibond
conductivity meter. Heavy meal concentrations
were determined with Spectra AA varion 400 plus
Atomic Absorption Spectrometer. Total aerobic
bacterial counts were determined by the pour-plate
technique technique. Total coliform counts were
determined by the Most Probable Number (MPN)
technique. The study revealed low pH, low TDS
and small quantities of cations and heavy metal
presence, and high total coliform bacteria counts of
42.2MPN/100ml which contributed to the
bacteriological pollution of rivers and coastal
waters resulting in limited possibilities of their use
for recreation. It is suggested that to detect coliform
organisms in water, either the multiple tubefermentation-technique or the use of the Membrane
Filter be employed because of the disadvantages
associated with the so called Most-ProbableNumber technique whose test is not sensitive to
large fluctuations in coliform densities.
Management of Camelite should consider pollution
abatement and ensure compliance with
environmental requirements.
Publication Title The Effect of Geomagnetic Storm in the Ionosphere using N-h Profiles.
Publication Type journal
Publisher Akamai University Journal
Paper Link http://www.akamaiuniversity.us/PJST.htm
Publication Authors J.C. Morka* ; D.N. Nwachuku; and D.A. Ogwu
Year Published 2015-05-15
Abstract ABSTRACT
This study presents the ionosphere effects of
geomagnetic storms using N-h profiles. The data
used are from ionograms at Ibadan (Latitude 70
260N, longitude 3.540
E and magnetic Dip of 60
S.
the result show a lot of variations as there are
positive and negative storm phases. The
disturbance daily variation of the electron density
NmF2, the height of maximum electron density
NmF2 and the sub peak electron density nT were
then obtained to study the correlation between the
disturbed and quiet days.
Publication Title CLIMATE CHANGE, ECOSYSTEM AND HUMAN HEALTH An overview
Publication Type journal
Publisher School of Sciences, College of Education, Agbor
Paper Link http://www.ajosse.com/
Publication Authors Morka, J.C, & Molua, O.C
Year Published 2008-02-12
Abstract Abstract
An overview of the impact of climate change on the ecosystem and on human health is hereby reported. The debate over the effects of ozone depletion and airborne particulate and indeed the greenhouse gases has produced a number of scientific materials on the subject matter. It therefore becomes necessary that a better understanding is established between the biosphere and climate as this will enable better planning for adapting to the changes that occur though it seems unlikely that climate management will become a reality within the foreseeable future.
Publication Title DESIGN, CONSTRUCTION AND CALIBRATION OF A RADIANT HEAT DETECTOR
Publication Type journal
Publisher Oasis Journal
Paper Link www.oasisresearchjournals.com
Publication Authors J. C. Morka and D. N. Nwachukwu
Year Published 2011-12-23
Abstract Abstract
A detector of heat radiation, designed and constructed with local materials is presented. The
instrument is calibrated and the performance studied. The detector consists of 100 hot junctions
and 100 cold junctions. The hot junctions are mounted on a flat plate collector and exposed to
the radiation to be measured, while the cold junctions are shielded from the direct incident
radiation. The thermo junction e.m.f of the incident radiation. The instrument is measured on a
modified potentiometer; this gives a measure of the instrument detects both the infra-red
radiation and the heat energy associated with the visible range of spectrum. The detector is
cheap, sensitive and particularly suitable for detecting the radiant heat from the sun
Publication Title ENVIRONMENTAL AUDIT REPORT OF UNIPETROL INSTALLATION LOCATED AT APAPA, LAGOS NIGERIA: CASE STUDY - EFFLUENT AND POTABLE WATER DISCHARGES
Publication Type journal
Publisher Oasis Journal
Paper Link www.oasisresearchjournals.com
Publication Authors J. C. Morka and J. K Awatefe
Year Published 2010-12-23
Abstract Abstract
Environmental audit, EA, is one of the available enforcement tools used as agent of
sustainable growth comprising a systematic, documented, periodic and objective
evaluation of the process technology, equipment performance, raw materials in use,
quality and quantity of wastes generated, and their effects on the air, soil, vegetation,
underground and surface water, with the aim of facilitating management control of
environmental practices and assessing compliance with company’s policies and
meeting regulatory requirements. This paper therefore reports the environmental
auditing of the effluent and potable water discharges at Unipetrol’s Apapa
Installation. The results show that the effluent from the separator pit has high Total
Hydrocarbon Content (THC), mean value is 13.13 Mg/l, Oil and grease, mean value
is 25.82 mg/L, Biochemical Oxygen Demand (BOD), mean Value is 169.44 mg/L and
Chemical Oxygen Demand (COD), mean value is 252.32 mg/L. These values were
above statutory limits and therefore requires that control measures be taken to
forestall pollution
Publication Title QUANTITATIVE STUDY ON THE SERIES RESISTANCE OF A MONOCRYSTRALLINE SILICON SOLAR CELL
Publication Type journal
Publisher Journal of Research in Pure and Applied Sciences
Paper Link www.oasisresearchjournals.com
Publication Authors J. C. Morka , Okoh J and Ogwu D A
Year Published 2015-03-23
Abstract Abstract
This paper describes the device physics of silicon solar cell using basic equations of minority
carriers with its boundary conditions; it also studies the series resistance of the cell in actual
atmospheric conditions. Also, the effects of lead contact resistance of the measuring circuit on the I-V curve of the cell are discussed.
Publication Title SOIL CONTAMINATION DUE TO HEAVY METALS WITHIN AUTO-MOBILE WORKSHOP CLUSTERS ALONG MARIERE BY T-JUNCTION ( ) AND ORUBOR BY PROF. EBIE (?) AGBOR, DELTA STATE-NIGERIA
Publication Type journal
Publisher International Journal of Research in Science and Engineering Technology
Paper Link www.oasisresearchjournals.com
Publication Authors Morka, J.C.1 , Obiwulu, Esther2 , Ataine, Tessy3 and Anthony, D.C.
Year Published 2016-05-30
Abstract Abstract
The concentration levels of heavy metals within two automobile clusters coded Alpha ( and Beta (?) respectively
in Agbor metropolis are presented. Heavy metal analysis of the soils in the two clusters showed the presence of cu,
mn, Ni, Zn, cd, Pb, and Fe in abundance trend of Fe > Zn > Mn > Pb > cd > Ni > cu. Also, the concentration levels
of the soils were above the control values except for cd at ? cluster. Cadium at ? cluster represented a contamination
hazards which requires some remedial action.
Publication Title THE EFFECT OF HEIGHT OF MAXIMUM DENSITY (hm) CHANGES ON THE ORDINARY WAVE CRITICAL FREQUENCY OF THE F2 LAYER (f0F2) IN THE QUIET EQUATORIAL IONOSPHERE
Publication Type journal
Publisher Journal of Research and Development
Paper Link www.oasisresearchjournals.com
Publication Authors Morka J.C ,Molua O.C. &Ighrakpata F.C
Year Published 2011-12-30
Abstract Abstract
This paper discusses the effect of hm changes on f0F2 . A set of theoretical h/
f (minimum vertical
height on the ordinary- wave branch for the F layers) curves called overlays were constructed
from a parabolic equation. ?f0F2 , hm and ?hm parameters were calculated for June Solstice
(representing May to August) and September Equinox (representing September and October) at
0900 hours, 12 00 hours and 1500 hours. The results obtained show that as ?hm increases,
?foF2 increases, indicating that height changes in the F2 layer shows a corresponding change in
the critical frequency of the layer. The correction for ?hm, show a shift in foF2 for the Solstice and Equinox.