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1109 articles for “loss”
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Dielectric Properties of Reduced Graphene Oxide with Nickel Cobalt Ferrite and Nickel Zinc Ferrite Epoxy Nanocomposites
Abstract: In this work, two systems of the composite were prepared using NiCoFe and NiZnFe with reduced graphene oxide(rGO) epoxy and the samples were subjected to electrochemical impedance spectroscopy (EIS). The Quality factor and loss tangent values of the composite was found out as a function of frequency. The modified ferrite-graphene-epoxy blends show dielectric loss and Quality factor values at low frequency. The incorporation of graphene aims to improve electrical conductivity, …
Published in Journal of Polymer & Composites · Vol. 11, Issue 11, 2023 · pp. 28–37 Read article
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The Resurging Effect of Climate – Human Interaction on the Soil of Abia State, Nigeria: A Climate Change Perspective.
Abstract: Abstract Studies on the impact of climate change on soil erosion have been widely acknowledged by parts of the eastern states of Nigeria as one of the major land degradation problems besetting the area. This study adopts Geographic Information System (GIS) and Remote Sensing techniques as veritable tool to study the effect of Climate – Human interaction on soil of Abia state. Increase in observed mean rainfall of 5.85, 5.62, …
Published in Journal of Energy, Environment & Carbon Credits · Vol. 10, Issue 2, 2020 · pp. 27–44 Read article
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Design of Rectangular Microstrip Patch Antenna for WBAN Application
Abstract: AbstractThis paper presents a microstrip patch antenna with frequency of 2.47 GHz with substrate of FR4 Epoxy with relative permittivity of 4.4. Due to very low cost and excellent mechanical properties it is ideal for wide range of electronic component applications. Here we have cut four rectangular corners on the patch. We have first cut one corner then we found the return loss as -15.6db and gain as 5.679.To improve …
Published in Journal of Microwave Engineering and Technologies · Vol. 7, Issue 1, 2020 · pp. 25–33 Read article
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Rectangular Micro Strip Patch Antenna Interconnected with Symmetrical Cut Hexagonal Shaped between Horizontal Lines Meta Material Structure Enhancement Bandwidth at 1.80 GHz
Abstract: This paper proposes a new generation of antenna that applies Metamaterial (MTM) properties at ground plane. The paper analyzes the performance of Microstrip Patch Antenna with and without using the MTM structure. Rectangular Microstrip Patch Antenna (RMPA) interconnected with symmetrical cut hexagonal shaped between horizontal lines MTM structure is proposed for enhancement of bandwidth and reduction of return loss at operating frequency of 1.80 GHz. The proposed antenna is designed …
Published in Journal of Microwave Engineering and Technologies · Vol. 1, Issue 3, 2014 · pp. 15–20 Read article
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Investigation of Square Monopole Antenna with Slotted Patch
Abstract: A novel antenna with slotted patch for L-Band applications is presented in this paper. The proposed antenna consists of a square patch with rectangular slot. By slotting of the patch the antenna shows enhancement of gain in allocated band. A rectangular slot in the patch and partial ground plane is used in this antenna to enhance return loss and bandwidth. The simulated results have shown that the designed antenna receives …
Published in Journal of Microwave Engineering and Technologies · Vol. 1, Issue 3, 2014 · pp. 21–25 Read article
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Plus Slotted Circular Patch Antenna for WiMax/WLAN Applications
Abstract: A wideband compact circular patch microstrip antenna is presented for various wireless systems such as WLAN and WiMax applications. The proposed antenna has been fabricated and the return loss bandwidth is measured. The simulated and measured antenna such as return loss, bandwidth and gain are presented. The Experimental result shows that the proposed antenna presents a bandwidth of 78.81% with the maximum gain of 6.2 dBi.
Published in Journal of Microwave Engineering and Technologies · Vol. 1, Issue 3, 2014 · pp. 38–43 Read article
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Development of Aluminium Based Silicon Carbide Particulate Metal Matrix Composite for Cylinder Liner
Abstract: Cylinder liner is used in engine block to give a wear protective surface for piston and piston rings. Friction accounts for a loss of over 30% of the total vehicle power. Over half of that power loss can be attributed to the frictional loss between piston rings and cylinder bores. The best approach for improving power train efficiency is to reduce friction loss and the way for reducing the rolling …
Published in Journal of Materials & Metallurgical Engineering · Vol. 7, Issue 1, 2017 · pp. 17–29 Read article
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Integrated Rock Typing and Rock Mechanics Studies for Median Line Principle Optimization
Abstract: Once a field has been identified, and a general method of reservoir exploitation decided, there are several methods to achieve the reservoir management goal, but some ways may cost twice as much as others. The most critical operations to developing a field are drilling of wells, and it overemphasizes which in the early stages of field development. Petroleum wells have changed character in recent decades, as compared to earlier times. …
Published in Journal of Petroleum Engineering & Technology · Vol. 10, Issue 1, 2020 · pp. 21–32 Read article
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Molebdate as Corrosion Inhibitor for Aluminium 356 In Acidic and Saline Media
Abstract: Corrosion processes are the cause of significant losses in industry. Organic, inorganic, and mixed material inhibitors have all been used to resist corrosion for a long time, but the environmental toxicity of organic corrosion inhibitors has driven a quest for inorganic corrosion inhibitors. The effect of molybdate as a new corrosion inhibitor on the corrosion of aluminium 356 in acidic and saline conditions was investigated using electrochemical and weight loss …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 9, Issue 1, 2022 · pp. 39–47 Read article
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Optimization of Characteristics of a Simple Microstrip Circular Patch Antenna using Rotable Slot
Abstract: In this paper, we have designed a simple circular patch antenna which radiates at 2.8 GHz. A slot is introduced and is rotated along the center axis. We have noticed that the frequency of the antenna is varied as a function of slot orientation. An optimal slot angle is determined based on the return loss and then the slot, patch dimensions are optimized to increase the realized gain and return …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 2, Issue 3, 2015 · pp. 31–36 Read article
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Optimal Size and Location of Capacitor Bank for Reactive Power Compensation Using Genetic Algorithm
Abstract: Power system operators are always faced with the dilemma of how to reduce the transmission loss. There are many ways to attain this target. In this thesis, new method for optimal capacitor placement for transmission loss minimization is planned. Proposed methods are based on the optimal capacitor placement formulations, which allow the cost benefit analysis and multi-objective optimization consideration of reactive power support investment. For better design of proposed methods, …
Published in Journal of VLSI Design Tools and Technology · Vol. 9, Issue 2, 2019 · pp. 28–34 Read article
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An Ultra Wideband Hexagonal Patch Antenna with Enhanced Bandwidth
Abstract: A microstrip line feed Ultra-Wideband (UWB - 3.1 to 10.6 GHz) hexagonal patch antenna with enhanced bandwidth was presented in this article. The enhancement of bandwidth (BW) is achieved by defecting the partial ground structure. The antenna is designed by FR-4 substrate with εr(dielectric constant) = 4.3 & Tan δ (loss tangent) = 0.025.Initially, a conventional hexagonal patch with a partial ground plane produces a – 10 dB bandwidth of …
Published in Recent Trends in Electronics Communication Systems · Vol. 9, Issue 1, 2022 · pp. 11–20 Read article
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Clinicoradiological Evaluation of Idiopathic Intracranial Hypertension
Abstract: Idiopathic intracranial hypertension refers to elevated intracranial pressure when there is no detectable space-occupying lesion. Individuals with idiopathic intracranial hypertension commonly exhibit classic indications of increased intracranial pressure, including headaches, nausea, neck discomfort, double vision, temporary visual obscurity, and swelling of the optic nerve head (papilledema). Typical magnetic resonance imaging findings include empty sella, optic nerve tortuousity, globe flattening, and transverse sinus stenosis. All patients from July 2021 to June …
Published in Research and Reviews: A Journal of Neuroscience · Vol. 13, Issue 2, 2023 · pp. 40–45 Read article
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Study of Rehydration and Dehydration behavior of Scolecite by insitu Raman spectroscopy
Abstract: The study of structural changes of stretching and bending modes around 3000-4000cm-1 and 700-1800cm-1 in the temperature range of 299 to 503 K during the dehydration of naturally occurring scolecite was investigated using in-situ Raman spectroscopy. A Raman spectrum from 3000-4000cm-1 was measured for a fibrous zeolite called scolecite to regulate the behavior of water molecules in the passages. The extending vibrations of H2O molecules of scolecite are located between …
Published in Journal of Polymer & Composites · Vol. 12, Issue 6, 2024 · pp. 152–159 Read article
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Evaluating the Environmental Impact of Mining: Procedures, Outcomes, and Sustainable Remediation
Abstract: Mining is necessary for economic growth and getting resources, yet also has a big impact on the environment. This article looks at the different ways that mining affects the environment, such as land degradation, deforestation, water pollution, air pollution, and loss of biodiversity. Mining on the surface and underground can cause soil erosion, damage ecosystems, and pollute groundwater and surface water with heavy metals and harmful compounds. Furthermore, the emission …
Published in International Journal of Minerals · Vol. 2, Issue 2, 2025 · pp. 12–24 Read article
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Three Stage High Step-up Interleaved Boost Converter with Voltage Multiplier Cell
Abstract: In this paper, three stage high step-up interleaved boost converter with three voltage multiplier cells (VMCS) and three state switching cells (3SSC) is proposed. Here an interleaved boost converter is used, as a result higher efficiency and reduced input ripple current is obtained. Also, an additional stage of voltage multiplier i.e., three stages is added so that voltage gain will increase. It reduces switching loss and stress through the devices. …
Published in Journal of Electronic Design Technology · Vol. 5, Issue 1, 2014 · pp. 39–56 Read article
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Noise Sources, Exposure, health effects and Control in Iron & Steel Foundry
Abstract: Foundries are one of the oldest industries and the most basic of all metallurgical processes, with two main procedures performed in a foundry: molding and metal casting. Workers are exposed to a wide range of hazardous compounds in the workplace due to the variety of materials and procedures performed in this industry, which can lead to chronic exposure to hazardous substances (physical and chemical). Noise is a major physical hazard …
Published in Journal of Industrial Safety Engineering · Vol. 8, Issue 2, 2021 · pp. 20–28 Read article
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Planar UWB Antenna for 5 GHz ISM Band
Abstract: AbstractThe Ultra-Wide Band (UWB) technology used for high data rate with low power levels for many wide applications which mainly includes short range, wide bandwidth communications. The Planar UWB antenna is designed for 5GHz Industrial, Scientific and Medical (ISM) band. These bands are specially dedicated to industrial, scientific and medical applications other than telecommunications. ISM applications like Microwave ovens, RF process heating and medical diathermy application. Proposed antenna has VSWR …
Published in Journal of Microwave Engineering and Technologies · Vol. 7, Issue 2, 2020 · pp. 1–6 Read article
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Design and Analysis of Multi Band Patch with Enhanced Bandwidth
Abstract: In this article, a novel lower edge defected multi-band patch with modified ground structure (or Defected Ground Structure-DGS) with enhanced bandwidth has been presented. The bandwidth can be enhanced by defecting the partial ground and by arc truncation of lower edges of the patch. The antenna was converted into multi-band by defecting the lower corners. The antenna is resonating at multiple bands i.e. 3.7 GHz, 7.87 (~7.9) GHz, 12.19 (~12.2) …
Published in Journal of Microwave Engineering and Technologies · Vol. 7, Issue 3, 2020 · pp. 1–8 Read article
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Study of Effect of Various Dielectrics on the Performance of Electromagnetic Bandgap Based Microstrip Patch Antenna Structure
Abstract: Here the effect of various dielectrics on the performance of microstrip patch antenna with underlying electromagnetic bandgap structure is investigated. This unique antenna structure suppresses the surface waves and reflects plane waves with no phase change and thus acts as a perfect magnetic conductor (PMC). Dielectric losses are reduced due to the presence of EBG structure and bandwidth enhancement is observed when compared to the non-EBG structure. The effect of …
Published in Journal of Microwave Engineering and Technologies · Vol. 2, Issue 2, 2015 · pp. 13–18 Read article