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1805 articles for “Techniques”
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Logarithmic Companding using Firefly Algorithm for PAPR Reduction in OFDM System
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) is a digital transmission method developed to meet the increasing demand for higher data rates in communications which can be used in both wired and wireless environments. However OFDM is handicapped with a major problem of high peak-to-average power ratio (PAPR), which gives rise to non-linear distortion, inter-symbol interference and out-of-band radiation. Several PAPR reduction techniques have been devised over the last few decades in …
Published in International Journal of Digital Communication and Analog Signals · Vol. 1, Issue 1, 2015 · pp. 1–8 Read article
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A Review Paper on OFDM: Basic Concept & Application
Abstract: The main objective of this paper, is to review the work already done associated with channel estimation technique in Orthogonal Frequency-Division Multiplexing (OFDM) effectively mitigates the problem of inter symbol interference (ISI) caused by the delay unfold of wireless channels. Therefore, it has been utilized in many wireless systems and adopted by numerous standards. Throughout this paper, we have presented a comprehensive survey on OFDM for wireless communications and their …
Published in International Journal of Digital Communication and Analog Signals · Vol. 2, Issue 2, 2016 · pp. 1–9 Read article
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Implementation of Standalone Photovoltaic Water Pumping System Employing Four Switch BLDC Drive and KY DC-DC Converter
Abstract: Solar based mostly water pumping system is obtaining a broad thought, since solar power is found to be the simplest resolution for the prevailing typical energy resources. Furthermore, solar PV (Photovoltaic) fed water pumping is favored technique among the remote regions for various applications. In this paper KY based mostly DC-DC device fed water pumping system with BLDC (Brushless DC motor) is proposed. Voltage ripple reduction is one among the …
Published in International Journal of Digital Communication and Analog Signals · Vol. 6, Issue 2, 2020 · pp. 28–40 Read article
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Broadbanding of Circular Patch Antenna Using Stub Loaded Stacked Configuration
Abstract: This paper proposes a stub loaded stacked configuration of a circular patch antenna using FR-4 material as a substrate with dielectric constant of 4.2 for resonant frequency of 2 GHz. This configuration is a hybrid of two broadbanding technique, the stub loading technique and stacking technique. The radius of the patch is calculated to be 18.88 mm and the air gap is 1 mm between the lower and upper layer. …
Published in International Journal of Microwave Engineering and Technology · Vol. 2, Issue 1, 2016 · pp. 20–25 Read article
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Power Amplification based on Bulk-Drive
Abstract: ABSTRACTThis paper presents a fully integrated, low transmit-power and high-efficiency power amplifier (PA) for low-power transmitters such as wireless sensor networks (WSN). Power Amplification is a major problem in power system network all over the world, which is illegal and should be strictly prohibited, it is highly impossible due to the linear relation between Voltage and Current. Power amplification can be defined as the amplification of the electrical power without …
Published in International Journal of Microwave Engineering and Technology · Vol. 5, Issue 2, 2019 · pp. 21–29 Read article
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Investigation on Five Phase Inverter
Abstract: In this paper, Sinusoidal Pulse width modulation (SINE-PWM) and Space Vector Pulse width modulation (SVPWM) techniques are implemented in the five phase inverter. Space vector modulation is realized using min-max method. Both SINE-PWM and SVPWM techniques are tested in simulation and hardware set-up. Results are obtained satisfactorily and it confirms the features of both PWM techniques. Keywords: Five phase inverter, SINE-PWM, SVPWM
Published in International Journal of Power Electronics Controllers and Converters · Vol. 1, Issue 1, 2015 · pp. 7–20 Read article
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Fibonacci Series for Hybrid Symmetrical Multilevel Inverter Topology Using Different PWM Strategies
Abstract: Multilevel inverters are suggested to obtain high superiority output voltage. In this paper, a new hybrid configuration is proposed, obtained by cascading one four switches H-bridge cell with a family of multilevel inverters. In addition, by the use of specific sequence for value of DC sources named Fibonacci series, new topology of proposed inverter is introduced. Main advantages are that planned inverter has least Peak Inverse Voltage (PIV) than other …
Published in International Journal of Power Electronics Controllers and Converters · Vol. 2, Issue 1, 2016 · pp. 54–60 Read article
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Efficient Control Strategies for Multiphase Interleaved Boost Converter in Photovoltaic Systems: A Modeling and Simulation Approach
Abstract: The main goal of this project is to create a Multiphase Interleaved boost converter with a solar module using the Maximum Power Point Tracking (MPPT) technique. Thus, the PV module is first examined in MATLAB with SIMULINK software. Just one diode here, a photovoltaic model is applied. The two environmental factors that have the biggest impact on PV cell properties are temperature and solar radiation. A three-phase interleaved boost converter …
Published in International Journal of Power Electronics Controllers and Converters · Vol. 9, Issue 2, 2023 · pp. 29–48 Read article
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Implementation of OFDM Using MATLAB and VHDL
Abstract: Orthogonal Frequency Division Multiplexing (OFDM) could be a digital transmission technique developed to fulfil the growing demand for higher information rates transmission of voice and video signals, which might be utilized in each wired and wireless environments. During a basic communication system, the information is modulated onto one carrier frequency. The obtainable information measure is then completely occupied by every symbol. This sort of system will result in inter-symbol-interference (ISI) …
Published in International Journal of Telecommunications & Emerging Technologies · Vol. 2, Issue 2, 2016 · pp. 6–16 Read article
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Recent Advances in the Development & Application of the High Energy Explosives
Abstract: High energy explosives play a pivotal role in various fields ranging from military applications to industrial uses. Recent advancements in materials science, chemical engineering, and detonation physics have led to significant strides in the development and application of high energy explosives. This paper provides an overview of these recent advances, focusing on key innovations in explosive formulations, manufacturing techniques, and performance optimization. One notable area of progress is the development …
Published in International Journal of Energetic Materials · Vol. 9, Issue 2, 2023 · pp. 18–23 Read article
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Evaluation of Corrosion kinetics of zirconium dioxide dispersion strengthened Aluminium metal matrix composites
Abstract: The corrosion kinetics of Aluminum 7068-Zirconium dioxide composites is a major aspect for assessing the capability of utilizing the materials for aviation segments. Aluminum 7068 matrix is a particular class of composite which is known for its high strength characteristics even in critical situations and is utilized as a part of aerospace, automobile and ordinance applications. However the investigations on impact of reinforcements, for instance zirconium dioxide on corrosion conduct …
Published in International Journal of Metallurgy and Alloys · Vol. 4, Issue 1, 2018 · pp. 9–23 Read article
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Advancement in Nanodiagnostic for Plant Pathogen Detection
Abstract: Nanotechnology refers to a nanoscale innovation, which has promising applications in everyday life. The word nanotechnology is generally used when referring to materials with the size of 0.1 to 100 nanometers. Nanotechnology is a multi-displinary science involving knowledge fro biology, chemistry, physics and other disciplines. The nanoparticles have small size, large surface area and high reactivity. These properties of nanoparticles revolutionized the agriculture researches. Rapid disease detection, targeted treatments, enhancing …
Published in International journal of Nanobiotechnology · Vol. 4, Issue 2, 2018 · pp. 1–7 Read article
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OPTIMIZATION OF EDM PARAMETERS USING PARTICLE SWARM OPTIMIZATION ALGORITHM
Abstract: Aluminium metal matrix composites are increasing the applications such as automobile industries, aerospace industries ,marine as well as construction. The use of nonconventional machining techniques in shaping aluminum metal matrix composites has generated extensive interest as the manufacturing of complicated contours such as dies. Electrical discharge machining (EDM) tends to be a promising technique for machining metal matrix composites. Hybrid Al6061 composite reinforced with 10% SiC and 4% Graphite particles …
Published in International Journal of Composite and Constituent Materials · Vol. 1, Issue 2, 2015 · pp. 1–9 Read article
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Fracture and crack propagations in plates - A review
Abstract: The development and applications of the boundary based finite element technique for fractured mechanics analysis are reviewed. Also, some researchers used the complex variable method and least boundary allocation method. In this method, most researcher investigated the 2-D isotropic, anisotropic and orthotropic materials for makes different types of plate such like this rectangular and circular with various cracks and hole cut-outs and these plates are used different types of bi-axial …
Published in International Journal of Mechanics and Design · Vol. 4, Issue 1, 2018 · pp. 1–14 Read article
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Fabrication and Analysis of Multistage Evaporative Cooler and Comparison with Single-stage Cooler
Abstract: Nowadays air conditioning has become a vital appliance with increasing the living standard of human beings. However, excessive use of air conditioners (AC) turns into health issues and is also linked to global climatic changes. It has been observed that the effects of climate change increase the use of air conditioners affecting human wellness and sleeping conditions. Literature reveals that AC devices are primarily used in living rooms, bedrooms, offices, …
Published in International Journal of Mechanics and Design · Vol. 9, Issue 2, 2023 · pp. 49–54 Read article
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Performance Analysis of Gradient-Based Focus Measures in a Parallax Affected SFF Scenario
Abstract: Abstract For scene reconstruction, shape from focus (SFF) is a popular technique in the field of computer vision. This is the fact that the SFF technique is based the focus levels of the pixels of the image preserves depth information. Conventionally, when there is a relative motion between the camera and the scene, SFF is implemented by using telecentric lenses, which avoid parallax effects. This becomes the chief component for …
Published in International Journal of Computer Aided Manufacturing · Vol. 1, Issue 2, 2016 · pp. 1–12 Read article
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Bidirectional AC-DC Converter for Electric Vehicle Charger
Abstract: This paper presents a single-phase bidirectional ac-dc converter for electrical vehicle charger. The converter is operating in both rectifier and inverter mode depending upon the operation of switches. The bidirectional power flow in rectifier or inverter mode can be achieved by controlling the AC line voltage with PWM technique. For achieving bidirectional flow of power a unipolar or bipolar pulse width modulation (PWM) technique may be applied at ac side …
Published in International Journal of Computer Aided Manufacturing · Vol. 5, Issue 1, 2019 · pp. 26–28 Read article
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A study to evaluate the effectiveness of structured teaching programme on progressive muscle relaxation with deep breathing exercise on sleep pattern among elderly persons in a selected village of the Palakkad town
Abstract: Everyone experiences an occasional restless night. But for those who toss and turn repeatedly, the inefficiency to sleep can be a cause of intense frustration and may even have serious problem. Sleep is equally necessary like as air, water or food. We need continuous and peaceful sleep to regain energy, feel rejuvenate and maintain our health and prosperity. Normal sleep patterns are spoiling, affecting both sleeping and waking hours. Sleep …
Published in International Journal of Geriatric Nursing · Vol. 1, Issue 2, 2018 · pp. 31–35 Read article
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A Study to Assess the Knowledge Regarding Standard Precautions among Staff Nurses Working in Various Departments of Selected Hospital, at Mangalore, Karnataka
Abstract: Background of the study: Standard precautions are the infection control techniques, mainly including good hygiene habits, use of personal protective equipment, correct sharps handling, and aseptic techniques. Objectives: To assess the knowledge regarding standard precautions among staff nurses working in various departments of selected hospital at Mangalore. Methodology: The descriptive design was adopted; the samples were chosen by convenience sampling techniques, which consisted of 40 staff nurses working in various …
Published in International Journal of Immunological Nursing · Vol. 6, Issue 2, 2020 · pp. 15–21 Read article
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Effectiveness of Hand Massage on Preoperative Anxiety in Patients Posted for Cataract Surgery, at a Selected Hospital of Haldwani, Uttarakhand
Abstract: Introduction: Eyes help us to appreciate the beauty of this world, experience the joy of learning new things & 80% of whatever we perceive comes from our vision. A cataract refers to the clouding or opacity of the typically transparent lens in the eyes. This condition can occur in one or both eyes and is a primary cause of global blindness. Material and Methods: The research approach was quantitative and …
Published in International Journal of Medical Surgical Nursing · Vol. 6, Issue 2, 2023 · pp. 30–40 Read article