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608 articles for “Laboratory”
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Detection of Radioactive Material Out of Regulatory Control: A Radiation Dose Survey of a University Environs in Rivers State, Nigeria
Abstract: This research investigates radiation levels at refuse dump sites and laboratories within the University of Port Harcourt, Nigeria environs and assesses the associated risks to human health and the environment. The study utilizes two radiation detection instruments namely the Personal Radiation Detector and the Radioisotope Identifier Device. The PRD offers real-time detection and spectroscopic analysis of gamma and neutron radiation, while the RID combines gamma and neutron radiation detection with …
Published in Journal of Nuclear Engineering & Technology · Vol. 13, Issue 2, 2023 · pp. 1–11 Read article
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Optimisation of the Experimental Methods for the Fabrication of Polymer Microstructures and Polymer Microfluidic Devices for Bioengineering Applications
Abstract: In this research paper, total 2278 individual polymer microstructures have been fabricated, measured and analyzed. Also, in this research paper, total 216 individual polymer microfluidic devices have been fabricated by the maskless lithography, hot embossing lithography, direct bonding technique, and indirect bonding technique, to record and analyze the surface-driven (passive) capillary flow individually in each microfluidic device. Total three individual polymers as SU8, polymethylmethacrylate (PMMA), and polyimide have been used …
Published in Journal of Polymer & Composites · Vol. 4, Issue 3, 2016 · pp. 8–26 Read article
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Nanoparticles in Cutting-edge Healthcare: Current Use and Emerging Issues
Abstract: Nanoparticles are sub-micron-sized particles (less than 100 nm on average). Using these materials as contrast agents in imaging and as carriers for medication and gene transfer into malignancies has given them a prominent place in contemporary medicine. Nanoparticles allow for previously inconceivable levels of analysis and therapy. However, nanoparticles provide new societal and environmental challenges, especially regarding toxicity. In this overview, we discuss how nanoparticles have benefited contemporary medicine and …
Published in Journal of Polymer & Composites · Vol. 11, Issue 3, 2023 · pp. 105–118 Read article
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Single-Phase Two-Stage Multi-Level Inverter Employing Low Number of Switching Devices
Abstract: In recent years, multilevel inverter (MLI) plays a significant role in low or medium voltage applications as a result of generating voltage with reduced harmonic contents. This paper proposes a new version of multi-level inverters (MLI) with reduced switching devices along with reduced harmonics content of output voltage, which results in low switching losses compared with conventional MLI topologies. In addition, the proposed inverter provides low total blocked voltage compared …
Published in Journal of Power Electronics and Power Systems · Vol. 9, Issue 2, 2019 · pp. 22–32 Read article
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Software and Hardware Implementation of Quasi z Source Inverter in DC-DC Converter with DC Motor as Load
Abstract: DC/DC power converters are employed in applications like telecom, industrial, automotive, military, aerospace and motor drives. The dc/dc converter market is forecast to grow at a strong rate to $ 4.3 billion by 2016. The primary factor limiting the widespread application of low voltage producing renewable energy sources to motor load is interfacing of converter system. The traditional voltage source inverter (VSI) cannot be dealt without overrating of inverter because …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 3, 2015 · pp. 97–107 Read article
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Development of Slip Power Recovery Scheme sing Buck-Boost Chopper for Performance enhancement of Wound Rotor IM Drive
Abstract: This paper presents the mathematical modeling and testing of wound rotor induction motor drive (WRIMD) to develop the slip power recovery scheme (SPRS) using buck-boost chopper control techniques improving the performance of drive. The main focus of this research work is on the understanding of methodological development of Simulink model of SPRS. Various mathematical equations describing performance characteristics of WRIMD using SPRS with buck-boost chopper are derived. The performance parameters …
Published in Journal of Power Electronics and Power Systems · Vol. 12, Issue 2, 2022 · pp. 44–63 Read article
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Experimental Analysis of the Effect of Fine Milled Husk of Rice as a Novel Filtration Control Agent for Water Based Drilling Fluid System
Abstract: Drilling operation is a complex process that requires integration of various engineering systems. As the drilling continues, the formation encountered offers challenges to wellbore integrity as pressure increases with depth. The influx of formation fluid is contained by the overbalance provided by weighted drilling fluid column. Another critical function of the mud is to restrict the filtration fluid lost to the formation by forming a suitable mud-cake around the wellbore. …
Published in Journal of Petroleum Engineering & Technology · Vol. 7, Issue 1, 2017 · pp. 4–8 Read article
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Establishment of Wax Deposition Index from Saturates, Aromatics, Resins, Asphaltenes Analysis
Abstract: Saturates, aromatics, resins, asphaltenes (SARA) analysis is one method of characterizing crude oils. It is versatile because it can apply to many components of the crude oil. SARA analysis furnishes one with the composition of any crude and ultimately gives an idea of the potential of the crude oil to precipitate and deposit wax. This analysis method usually breaks crude oil down into four components (saturates, aromatics, resins and asphaltenes) …
Published in Journal of Petroleum Engineering & Technology · Vol. 6, Issue 1, 2016 · pp. 1–8 Read article
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Mud Acid Effect on Fines Migration Problem Using a Newly Developed Al/Zr-Based Clay Stabilizer (A): Mitigation Can Happen
Abstract: Sandstone reservoirs exhibit severe fines migration problems subsequent to conventional mud acid (HCl: HF) treatments. The acid treatment proved to be effective for a relatively short period of time, with a sudden production decline owing to either that mud acid spent rapidly in close proximity to the wellbore, causing clays to migrate into the acidized area and re-plug the formation; or that the mud acid system actually weakens the structure …
Published in Journal of Petroleum Engineering & Technology · Vol. 5, Issue 3, 2015 · pp. 11–29 Read article
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Status of Alkaline Flooding Technology
Abstract: Very few review papers on alkaline flooding have been published in the petroleum literature. One paper gives an extensive review of caustic mechanisms to improve oil recovery, followed by a brief description of a few trials. The other paper summarizes the field tests completed, in progress and planned by 1983. This paper will not repeat a detailed discussion of mechanisms and a presentation of individual field projects. Only a brief …
Published in Journal of Petroleum Engineering & Technology · Vol. 5, Issue 1, 2015 · pp. 44–50 Read article
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Determination of Possible Point of Wax Depositionalong Flowlines in the Niger Delta
Abstract: The focus of this study is to determine the possible point of wax deposition along an oil flowline in Niger delta. This research commenced with field studies to ascertain the flowline profile. The temperature profile along the flowline was determined using infra-red thermometer. Crude oil sample was taken from wellhead and laboratory analysis was carried out on the crude sample to determine the wax appearance temperature (WAT) of crude and …
Published in Journal of Petroleum Engineering & Technology · Vol. 10, Issue 3, 2020 · pp. 1–8 Read article
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Diesel Adulteration Detection Using Gaseous Vapor Emission
Abstract: Diesel adulteration is the illegal or unauthorized introduction of foreign substances into pure diesel,causing the product to not conform to the requirements and specifications for use in the Oil and GasIndustry. Current methods to detect diesel adulteration require chemical laboratory experiments tomeasure parameters such as density, API gravity, viscosity, flash point, and evaporation point. Thesemethods require specialized, expensive equipment and cannot be utilized be quickly and readilyemployed at point of …
Published in Journal of Petroleum Engineering & Technology · Vol. 11, Issue 1, 2021 · pp. 69–76 Read article
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Enhanced Oil Recovery through the Application of Nanoparticles with Irvingia Gabonensis in Flooding Process in the Reservoir
Abstract: This experimental investigation is aimed at establishing the ability of nanofluids formula from a mixture of nanoparticles and oil extracted from Irvingia gabonensis (bush mango) in enhancing recovery from oil reservoir. The laboratory study involved the use of core flooding unit, crude oil, brine, nano-particles and Irvingia gabonensis. In this study, nanofluids formulated from nanoparticles of aluminum oxide (Al 2 O 3 ) and zinc oxide (ZnO) respectively were used …
Published in Journal of Petroleum Engineering & Technology · Vol. 12, Issue 2, 2022 · pp. 1–9 Read article
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Significance of Halogen in Crude Oil Refining and It’s Test Methods
Abstract: Halogen includes organic and inorganic ions of fluoride, chloride, bromide and iodide. Natural crude oils are fossil fuel and generally not having any halogens. Water is part of exploration out come and it will separate maximum extent however some amount of water remains with crude oils which is main source of inorganic halogens. The source of organic halogens is mainly from process chemicals/additives that are used while exploration/transportation or adulteration …
Published in Journal of Petroleum Engineering & Technology · Vol. 13, Issue 1, 2023 · pp. 1–5 Read article
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Semiconductor Devices for Assessing Freshness of Food Products
Abstract: Freshness of food is one of the major deterministic factors that govern human health and wellbeing. Consumption of stale food can have minor to serious health implications. In general assessment of the quality of food relies upon human sensory evaluations. However, the perceived intensity of sensory attributes can vary significantly. To replace this confusion, scientists develop portable and inexpensive sensors with notable accuracy. In particular, dairy products, seafood and meat …
Published in Journal of Semiconductor Devices and Circuits · Vol. 7, Issue 3, 2020 · pp. 5–10 Read article
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A Review on Electric Spring Utilization for Smart Grid Structure in Power Generation
Abstract: The review documents contained in the literature are either completely off the non-critical load or forwarded within a convenient time frame based on the resulting satisfaction. In this study, instead of shifting critical loads to other terms, they tried to adjust the energy consumption of non-critical loads with the help of AC. A rule-based energy management algorithm is proposed, which uses electric springs to use AC microgrids.A new DC/DC converter …
Published in Journal of Semiconductor Devices and Circuits · Vol. 8, Issue 1, 2021 · pp. 37–43 Read article
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Corrosion of Reinforcement in Concrete and Steel: Review Paper
Abstract: Present paper review about all the aspects of corrosion of reinforcement. Like methods for controlling the corrosion, Alternatives materials, numerical modelling for predicting the corrosion rates. Different admixtures used for controlling corrosions. Epoxy materials compared to conventional cementite materials shows very small shrinkage defect. For damage prediction rate of corrosion is very crucial input parameters. Corrosioninfluencing factors such as cover cracking, resistivity, concrete quality and cover depth should be incorporated …
Published in Journal of Structural Engineering and Management · Vol. 3, Issue 2, 2016 · pp. 43–50 Read article
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An Experimental Study on Effect of Seawater on Strength of M30 Grade Concrete
Abstract: The concrete structures constructed near the coastal areas may deteriorate due to the action of sea salts present in seawater on hardened concrete surface with passage of time. The strength decreases due to the formation of complex ions when chloride and sulphate ions, react with cement hydration products. In this study, experiments were carried out to get the effect of seawater on the strength of M30 grade concrete in laboratory …
Published in Journal of Structural Engineering and Management · Vol. 3, Issue 3, 2016 · pp. 55–59 Read article
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Influence of Corrosion on Flexural Strength of Concrete
Abstract: The large-scale infrastructure uses reinforcement concrete. It has been believed that protection to steel reinforcement by concrete is permanent. The influence of atmospheric corrosion of steel and its performance in concrete has been subject to controversy in the construction industry. Service life of reinforced concrete structure can be significantly reduced when the corrosion of reinforcing steel is initiated; the product of corrosion expands and occupies greater volume than original volume …
Published in Journal of Structural Engineering and Management · Vol. 4, Issue 1, 2017 · pp. 35–42 Read article
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Surface-Driven Capillary Flow of the Dyed Aqueous Ethanol in a single SU-8 based Glass Microfluidic Device integrated with the Arrays of Square Polyimide Micropillars
Abstract: In this work, a single SU-8 based glass microfluidic device is fabricated by the maskless lithography and indirect bonding technique. A particular polyimide layer at the selected portions and the arrays of square polyimide micropillars at the other portions are integrated on the microchannel bottom wall by the maskless lithography. Dyed aqueous ethanol (70% dyed water, 30% ethanol) is prepared as the working liquid in this work. A CMOS camera …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 6, Issue 1, 2019 · pp. 33–37 Read article