Polytechnica
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Salt Rock: a Strategic Geomaterial in Brazil
Polytechnica - Tập 3 - Trang 66-77 - 2020
This paper presents a new challenge under study in Brazil: the offshore storage
of natural gas and CO2 in salt (halite) caverns opened by solution mining in
shallow and ultradeep water. The salt rock mechanics in Brazil started with the
underground mining of sylvinite (NaCl.KCL) overlying tachyhydrite
(CaCl2.MgCl2.12H2O) and research initiated in the 1970s (Costa 1984), to enable
the mining of thi...
Ubiquitous Health Technology Management (uHTM)
Polytechnica - Tập 4 - Trang 47-57 - 2021
The COVID-19 pandemic increased the need for distributed and ubiquitous health
technology management. The eminent risk of Sars-CoV-2 contamination when
visiting a health care establishment requires an efficient allocation of the
technical team. The equipment problems should be quickly identified and fixed to
keep the facility working at its full condition. This article presents a
solution to perfo...
Design of Potential Rainwater Harvesting Structures for Environmental Adoption Measures in India
Polytechnica - Tập 4 - Trang 59-80 - 2021
As the scarcity of water is rapidly increasing everyday particularly during the
summer season, the demand for water also substantially increases. Previously
around thirty to forty years back, the major part of the earth is unpaved and
the amount of infrastructure built on the earth were also very low, hence during
the monsoon season the rainwater easily percolates into the earth through the
soil a...
Remote Vital Sign Monitoring in Accidents
Polytechnica - Tập 4 - Trang 26-32 - 2021
This paper proposes to evaluate the feasibility of obtaining the heart rate (HR)
through remote Photoplethysmography (rPPG) while the subject is lying down in an
emergency situation. The proposed methodology performs image and signal
processing on frames containing part of a person’s skin to infer the blood
volume variation signal, and then, estimate the HR. As the study evaluates the
accuracy of ...
Disturbances to Urban Mobility and Comprehensive Estimation of Economic Losses
Polytechnica - Tập 1 - Trang 48-60 - 2018
Civil infrastructure systems are disturbed by natural or man-made hazards at an
increasing frequency and severity. Among these systems, transportation systems
are especially vulnerable due to their nature and are of significant importance
to urban built environments as they maintain the mobility of urban dwellers and
goods. Mobility disturbances are significant not only due to the direct losses
as...
Assessment of Granite – Kaolin Composite Bricks as Storage Barrier Facility for Liquid Radioactive Waste
Polytechnica - Tập 5 - Trang 1-12 - 2022
Gamma radiation shielding of baked and unbaked granite bricks produced with
0%,10%, 20%, 30%, 40%, 50% of kaolin powder were experimentally and
theoretically assessed for possible deployment in liquid radioactive waste
storage. A 3 × 3 inches NaI(Ti) detector and WinXCOM program were used to
measure the linear attenuation coefficients at different energies. Elements
composition of samples were ana...
Solar Photovoltaic System Maintenance Strategies: A Review
Polytechnica - Tập 6 - Trang 1-24 - 2023
Solar energy as a source of clean and renewable energy generation has gained
traction over the years as an alternative to conventional fossil fuels. This is
as a result of the search for permanent and effective solutions to the
environmental issues such as environmental pollution, global warming and
greenhouse gas emission affecting our planet. Solar photovoltaic system is one
of the technologies ...
A Novel Study of Dielectric Properties of Discs Fabricated from Nanopowder of Calcined Clams, Periwinkle, and Oyster Shells
Polytechnica - Tập 5 - Trang 51-59 - 2023
A novel study of dielectric properties of discs developed separately using
nano-powder of calcined Clams, Periwinkle, and Oyster shells has been carried
out. The shells (obtained from market dumpsite) were washed, air-dried, calcined
and ball-milled to nano-powder having particles that sized at most 80 nm. In
each case, five thicknesses of discs were considered and three replicates were
fabricated...
Effects of Municipal Waste Disposal Methods on Community Health in Ibadan - Nigeria
Polytechnica - Tập 1 - Trang 61-72 - 2018
The generation of waste, and its disposal, collection, transport and processing
are important for healthy ecosystems and the health of people. The negative
health effects of waste management is the subject of a large literature. Two
main health outcomes have been found to be statistically associated with waste
exposure: cancer and congenital malformations. This research study was designed
to exami...
Glyphosate Toxicity: Effects on the Behavioural and Growth Responses of Juvenile Clarias gariepinus
Polytechnica - - 2024
Glyphosate is a broad spectrum herbicide used primarily in agricultural
applications for the control of variety of weeds in both terrestrial and aquatic
environments. Pollution of aquatic habitat may result in mass fish mortality or
affect the physiology and survival of fish. Thus, this study evaluated the
effects of exposure of juveniles of the African catfish, Clarias gariepinus, to
sub-lethal d...
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