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A novel non-customary method of image compression based on image spectrum Sādhanā (IF 0.849) Pub Date : 2020-11-19 Himanshu Kumar, Sumana Gupta, K S Venkatesh
Compression of multimedia content is an important processing step and backbone of real life applications in terms of optimum resource utilization in transmission and storage. It is an established field of research with very little scope for further improvement in achieved compression through customary coding-based compression techniques. Consequently, non-customary compression methods have become an
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An image processing method to measure droplet impact and evaporation on a solid surface Sādhanā (IF 0.849) Pub Date : 2020-11-19 AMITOSH DASH, PRATHAMESH G BANGE, NAGESH D PATIL, RAJNEESH BHARDWAJ
We employ high-speed visualization to quantify the impact and evaporation of a droplet on a solid surface. The time-varying droplet shapes are recorded using a high-speed camera and an image processing method is developed for measurement for droplet dimensions, dynamic contact angle, and volume. The method is based on the liquid-gas and liquid-solid interface detection using Canny’s method and Otsu’s
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A comparison of novel optimization model and algorithm for solving PMU deployment issues in the grid Sādhanā (IF 0.849) Pub Date : 2020-11-18 Anshul Agarwal, Krithi Ramamritham
Phasor Measurement Unit (PMU) sensors are commonly used nowadays for sensing different line parameters of the grid for making it more efficient and reliable. However, they are costly to procure and maintain. Also, they may fail and produce measurements with errors. Towards these issues, a novel optimization model and a polynomial time algorithm are developed that solve these issues with respect to
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Influence of ethanol on the performance, combustion and emission characteristics of a stationary diesel engine run on diesel– Mesua ferrea linn oil blend Sādhanā (IF 0.849) Pub Date : 2020-11-18 Maryom Dabi, Ujjwal K Saha
The addition of ethanol to a blend of vegetable oil (VO) and diesel, in general, has been found to improve the compression ignition diesel engine performance. In the present investigation, the influence of ethanol on Mesua ferrea Linn oil–diesel blend has been studied. Mesua ferrea Linn trees, abundant in the north eastern states of India, have the potential to supplement the fossil diesel. The blend
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Detection of electricity theft using data processing and LSTM method in distribution systems Sādhanā (IF 0.849) Pub Date : 2020-11-18 Behçet Kocaman, Vedat Tümen
Electricity theft is a big problem faced by all energy distribution services and continues to rising. Therefore, studies on electricity theft detection techniques have increased in recent years. Unsuitable calibration and illegal calibration of energy meters during production may cause non-technical losses. Non-technical losses have been a major concern for the resulting security risks and the immeasurable
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Effects of Roughness on the Performance of a threaded Zigzag Demister Using RSM and k − ω turbulent models Sādhanā (IF 0.849) Pub Date : 2020-11-18 Farhad Alamshahi, Hassan Rahimzadeh, Roohollah Rafee, M A Moghimi, Pouyan Talebizadehsardari
In this paper, the effects of channel roughness on the droplet removal efficiency and pressure drop in a zigzag mist eliminator are investigated. The fluid flow, droplet dispersion and deposition through the demister are modelled using a commercial Computational Fluid Dynamics (CFD) tool. The turbulent airflow is simulated using two different Shear-stress Transport (SST) k-ω model and Reynolds Stress
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Design and implementation of CDTA: a review Sādhanā (IF 0.849) Pub Date : 2020-11-13 Shailendra Bisariya, Neelofer Afzal
In this paper a review on design perspective of current-mode current differential trans-conductance amplifier (CDTA) is presented for the state of the art analog signal processing/generating modules design as the main objective. The CDTA circuits are classified according to the active element used for the design with all related parameters taken into consideration. Likelihood implementations of different
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A unified method to the design of an improved high frequency sliding mode current controller for DC/DC boost converter in continuous current condition based on analogue implementation Sādhanā (IF 0.849) Pub Date : 2020-11-10 Alireza Goudarzian, Adel Khosravi
In this study, an improved high frequency sliding mode current controller is proposed for DC/DC power converters in continuous current condition using analogue-based implementation. The sliding mode control is a variable frequency method. In this strategy, the controller frequency is a function of summation of all time delays of different parts of control circuit. If these delays increase, the switching
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Nano-TiO 2 particles: a photocatalytic admixture to amp up the performance efficiency of cementitious composites Sādhanā (IF 0.849) Pub Date : 2020-11-09 Sujay Raghavendra Naganna, K Jayakesh, V R Anand
The utilization of nanoparticle-blended cement while producing concrete or mortar is gaining immense significance nowadays, mainly on account of the improvements in the long-term durability characteristics of the composites. The feasibility of using cement blended with nano-\(\hbox {TiO}_{2}\) particles to produce less permeable or impermeable mortar and concrete of sufficient strength and durability
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A simple and low cost measurement technology for solar PV modules Sādhanā (IF 0.849) Pub Date : 2020-11-06 Sudipta Basu Pal, Konika Das Bhattacharya, Dipankar Mukherjee, Debkalyan Paul
The appropriate measurement of solar power output plays a critical role in the performance analysis of any solar power plant or a photovoltaic array. The performance under standard test conditions (STC), as mentioned by the manufacturers, is seldom attained as measurements of a PV module/array are done in outdoor terms. To evaluate the efficiency of performance, a photovoltaic module/array accurately
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Mechanical, thermal, and water absorption behaviour of jute/carbon reinforced hybrid composites Sādhanā (IF 0.849) Pub Date : 2020-11-06 Margabandu Sathiyamoorthy, Subramaniam Senthilkumar
The demand for fiber-reinforced composite materials is increasing in structural applications due to their crucial characteristics such as stiffness, strength, and durability and processing benefits at low cost. In this study, jute/carbon hybrid composite laminates were investigated for the effect of fabric hybridization and stacking sequence on tensile, impact, microhardness, water absorption, and
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Direct approximation of fractional order systems as a reduced integer/fractional-order model by genetic algorithm Sādhanā (IF 0.849) Pub Date : 2020-11-05 Hasan Nasiri Soloklo, Nooshin Bigdeli
In this paper, a new method is proposed for the reduced-order model approximation of commensurate/incommensurate fractional order (FO) systems. For integer order approximation, the model order is determined via Hankel singular values of the original system; while the order of FO approximations is determined via optimization. Unknown parameters of the reduced model are obtained by minimizing a fitness
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Retraction Note to: Writer identification using graphemes Sādhanā (IF 0.849) Pub Date : 2020-11-04 Manoj Kumar Sharma, Vanshika Chanderiya
The Editor-in-Chief has retracted this article [1] because it contains material that substantially overlaps with another publication [2].
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Design and investigation of low-complexity Anurupyena Vedic multiplier for machine learning applications Sādhanā (IF 0.849) Pub Date : 2020-11-03 Santhosh Kumar Parameswaran, Gowrishankar Chinnusamy
The current world of computers is based on machine leaning and profound learning towards artificial intelligence. In recent investigations, parallelisms are used to solve difficult problems. For the implementation of the FPGA, new architectures have been built using design techniques VLSI and parallel computing technologies. Research on reconfigurable computing, machine learning and signal processing
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Modelling and multiresponse optimization for minimizing burr height, thrust force and surface roughness in drilling of ferritic stainless steel Sādhanā (IF 0.849) Pub Date : 2020-11-03 Mustafa Günay, Tolga Meral
Although there have been many studies on the drillability of various grades of stainless steel, there is no scientific research on the drilling of ferritic stainless steel. Also, the burr at hole exit means the need for secondary machining operation and indirectly increases the production cost. Thus, this study focused on the modeling and minimizing burr height (Bh), thrust force (Fz) and surface roughness
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Karhunen Loeve Transform with adaptive dictionary learning for coherent and random noise attenuation in seismic data Sādhanā (IF 0.849) Pub Date : 2020-11-03 Ramya Jayakumar, Somasundareswari Dhandapani
Seismic reflection data are used by geologists to identify the best site for oil and gas explorations. The raw seismic image cannot be directly used for explorations because the noises may hinder the primary reflections and result in misinterpretations. In the proposed research work, the denoising method with adaptive dictionary learning is attempted to attenuate the coherent and random noises which
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Wide-range energy-efficient buffer-based voltage level-up converters for multi-supply voltage systems Sādhanā (IF 0.849) Pub Date : 2020-11-03 Selvakumar Rajendran, Arvind Chakrapani
The voltage level converters (LCs) are required to attain optimized power consumption by interfacing two or more supply voltage domains in Systems-on-Chip (SoC) applications. The voltage level-up conversion can be easily and effectively achieved by the use of buffer structures. Hence this article proposes two buffer-based LCs, namely transmission gate buffer level converter (TGBLC) and stacked PMOS
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Implementation of a novel and versatile initial rotor position estimation method on surface-mounted permanent magnet synchronous motor prototype at zero speed Sādhanā (IF 0.849) Pub Date : 2020-10-31 Sourabh Paitandi, Mainak Sengupta
This paper presents a novel initial rotor position estimation method for a surface-mounted permanent magnet synchronous motor (SPMSM) using its inherent magnetic features. Here, the initial rotor position has been estimated utilising the variation in phase inductances arising out of the unavoidable but very small saliency occurring either out of magnetic saturation of the machine or the magnet shape
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Detection of situational information from Twitter during disaster using deep learning models Sādhanā (IF 0.849) Pub Date : 2020-10-30 Sreenivasulu Madichetty, Sridevi Muthukumarasamy
Twitter is an excellent resource for communicating between the victims and organizations during a disaster. People share opinions, sympathies, situational information, etc., in the form of tweets during a disaster. Detecting the situational tweets is a challenging task, which is very helpful to both humanitarian organizations and victims. There is a chance that both situational and non-situational
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RNN based question answer generation and ranking for financial documents using financial NER Sādhanā (IF 0.849) Pub Date : 2020-10-28 Hariharan Jayakumar, Madhav Sankar Krishnakumar, Vishal Veda Vyas Peddagopu, Rajeswari Sridhar
Organizations, governments and many entities deal with an expanse of voluminous financial documents and this necessitates a need for a financial expert system which, given a financial document, extracts finance-related questions and answers from it. This expert system helps us to adequately summarize the document in the form of a question-answer report. This paper introduces the novel idea of generating
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Performance criteria and tuning of fractional-order cascade control system Sādhanā (IF 0.849) Pub Date : 2020-10-26 Somnath Garai, Priyobroto Basu, Ashoke Sutradhar, Anindita Sengupta
Industrial process control systems suffer from the overshoot problem. Designing the controller plant models by conventional Proportional Integral Derivative (PID) may increase the rise time, settling time and overshoot. Cascade control is a remedial measure undertaken to overcome these problems. In this paper, we present a new cascade model using fractional-order PIDs. The fractional-order cascade
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Cost-efficiency measurement for two-stage DEA network using game approach: an application to electrical network in Iran Sādhanā (IF 0.849) Pub Date : 2020-10-24 RAHELEH MOUSAVIZADEH, MEHRZAD NAVABAKHSH, ASHKAN HAFEZALKOTOB
This study proposes a two-stage game–data envelopment analysis (DEA) approach for cost-efficiency (CE) measurement using centralized and Stackelberg game models. Each decision-making unit (DMU) is proposed to make up two-stage network structures (or processes), where all the first-stage outputs are the only second-stage inputs. The main contribution of this study is the development of cooperative and
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A robust WKNN-TLS-ESPRIT algorithm for identification of electromechanical oscillation modes utilizing WAMS Sādhanā (IF 0.849) Pub Date : 2020-10-22 Shekha Rai
This paper proposes a robust WKNN-TLS-ESPRIT algorithm that takes into account the effect of the unavailability of phasor measurement unit (PMU) data for identifying the low-frequency oscillatory modes in power systems. The main contribution of the proposed work is to create an enhanced autocorrelation matrix using a weighted K nearest neighbours (WKNN)-based predictive model to deal with such issues
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E-learning based on the adaptive learning model: case study in Serbia Sādhanā (IF 0.849) Pub Date : 2020-10-22 Branka Arsovic, Nenad Stefanovic
Today’s education faces many challenges related to learning and teaching efficiency, effectiveness, and costs. Contemporary research shows that the learning environment with the ability to adapt to individual needs, requirements, and competencies of students, facilitates the learning process and leads to improved learning outcomes and achievements. Nevertheless, learning management systems (LMS) that
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NN-based analytic approach to symbol level recognition for degraded Bengali printed documents Sādhanā (IF 0.849) Pub Date : 2020-10-22 Jayati Mukherjee, Swapan K Parui, Utpal Roy
Analysis of degraded printed documents has been a research topic for last several years. In this article the contribution lies in segmentation of word images into symbols and recognition of the symbols of degraded printed document images of Bengali, the 7th most popular language in the world. A novel approach to symbol level segmentation based on a Multilayer Perceptron (MLP) network is proposed. A
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Experimental investigation on electric discharge drilling of titanium alloy (Ti–6Al–4V) with a gas-aided rotary tool Sādhanā (IF 0.849) Pub Date : 2020-10-22 NISHANT K SINGH, YASHVIR SINGH, ABHISHEK SHARMA
In this study, the authors tried to make holes in a titanium-based superalloy by a completely new machining method called electro-discharge drilling (EDD) using a gas-aided multi-hole rotating tool. Successful machining of the titanium work samples is extremely challenging due to its extreme hardness and stiffness. One of the key challenges facing the EDD operation is the elimination of spark-eroded
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Asymmetric nose-fairing for wing–body interference flow Sādhanā (IF 0.849) Pub Date : 2020-10-20 A Chandan Kumar, L Venkatakrishnan
In the context of the wing–fuselage junction flow the purpose of a nose-fairing is to prevent the oncoming boundary-layer flow separation, which in turn eliminates the horseshoe vortex formation at the junction. A simple procedure is proposed here to arrive at an asymmetric fairing shape for a non-zero wing incidence angle. Even though it is a simple method to decide on fairing shape and size, the
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A compact printed ultra-wideband filtenna with low dispersion for WiMAX and WLAN interference cancellation Sādhanā (IF 0.849) Pub Date : 2020-10-17 Surajit Kundu
A printed monopole filtenna fed by a co-planar waveguide with U-shaped split slot on patch and circular split ring resonator pairs at the other side of feed is proposed in this letter. The compact filtenna of dimension 0.32λ × 0.215λ (λ denotes wavelength corresponding to 2.68 GHz) is capable of providing large bandwidth from 2.68 to 8.72 GHz with dual frequency notch bands over 3.28–3.84 and 4.95–6
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Heat and mass transfer analysis on multiport mini channel shelf heat exchanger for freeze-drying application Sādhanā (IF 0.849) Pub Date : 2020-10-15 G Srinivasan, B Raja
An experimental study on heat transfer characteristics of shelf heat exchangers, which are used in small-scale freeze dryers, is presented in this paper. The proposed heat exchanger consists of the multiport mini-channel flow paths, and a comparison with a conventional serpentine is carried out based on uniformity of the product temperature achieved. The experimental results indicate that the mini-channel
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Influences of gear design parameters on dynamic tooth loads and time-varying mesh stiffness of involute spur gears Sādhanā (IF 0.849) Pub Date : 2020-10-14 Oğuz Doğan, Fatih Karpat, Osman Kopmaz, Stephen Ekwaro-Osire
Gears are one of the most significant machine elements in power transmission due to the many advantages such as high load capacity, long life, and reliability. Due to the increasing power and speed values, the characteristics expected from the transmission elements are also increasing. Significant changes occur in the dynamic behavior of the gears at high speed due to the resonance. For this reason
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A numerical study on the effect of aspect-ratio and density ratio on the dynamics of freely falling plate in the flutter-to-tumble transition regime Sādhanā (IF 0.849) Pub Date : 2020-10-14 A Rana, V K Kushwaha, Arnab Kumar De
The motion of a freely falling thin aluminium plate in water is studied using two-dimensional numerical simulations. The fluid-solid interface is treated using the diffuse interface immersed boundary method. Periodic side-to-side fluttering motion at the small dimensionless moment of inertia \((I^{*})\) becomes chaotic in the intermediate range which finally settles for pure tumbling at high \(I^*\)
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Bi-level multi-objective model for existing link capacity expansion problem across urban transportation network considering travel time reliability: presenting dynamic particle swarm algorithm Sādhanā (IF 0.849) Pub Date : 2020-10-12 Amir Hossein Barahimi, Alireza Eydi, Abdolah Aghaie
Urban transportation network design and traffic control problems fall within the scope of infrastructural engineering sciences which become increasingly more important in ever-growing societies of today. In highly populated old cities where establishing new links are facing many human-related, social, economic, and political problems, a workaround for addressing traffic problems is to expand the capacity
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Performance analysis of current lightweight stream ciphers for constrained environments Sādhanā (IF 0.849) Pub Date : 2020-10-12 Subhrajyoti Deb, Bubu Bhuyan
Maintaining an adequate balance between security and other performance metrics like memory requirement, throughput and energy requirement in a resource-constrained environment is a major challenge. The National Institute of Standards and Technology (NIST), in its latest lightweight cryptography report, suggested the suitability of symmetric ciphers in constrained devices. In this paper we have performed
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Branch-and-bound algorithms for scheduling in an m -machine no-wait flowshop Sādhanā (IF 0.849) Pub Date : 2020-10-12 Narayanaprasad Madhushini, Chandrasekharan Rajendran
In this paper, we develop branch-and-bound algorithms for objectives such as sum of weighted flowtime, weighted tardiness and weighted earliness of jobs, for an \(m-\)machine no-wait (continuous) flowshop. We believe that there has been no prior work on exact algorithms for this problem setup with a variety of objective functions. For the interest of space, we confine our discussion to a subset of
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An automated approach to retrieve lecture videos using context based semantic features and deep learning Sādhanā (IF 0.849) Pub Date : 2020-10-08 N POORNIMA, B SALEENA
Video digitization is one of the emerging technologies holding significant importance over years in applications like video recording and video compression. There are different techniques available in the literature for the effective retrieval of videos. This research work presents a video retrieval scheme based on a deep learning strategy. Initially, the video archive is subjected to the keyframe
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Experimental investigation of magnetic-field-assisted electric discharge machining by silicon-based dielectric of Inconel 706 superalloy Sādhanā (IF 0.849) Pub Date : 2020-10-07 Sushil Kumar, Mudimallana Goud, Narendra Mohan Suri
Inconel 706 is a nickel–iron-based superalloy having higher mechanical strength along with easiness of fabrication, which makes it suitable for gas turbine disk applications. The current study investigates the hybrid magnetic-field-assisted powder mixed electric discharge machining (MFAPMEDM) process to improve performance in machining Inconel 706. For conducting experiments, an in-house set-up was
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An integrated feedforward-feedback control structure utilizing a simplified global gravitational search algorithm to control nonlinear systems Sādhanā (IF 0.849) Pub Date : 2020-10-06 Omar Farouq Lutfy
This paper presents an integrated feedforward-feedback control structure to control nonlinear dynamical systems. This intelligent control system exploits a modified recurrent wavelet neural network (MRWNN) in the feedforward (FF) and the feedback (FB) loops of the control structure. Specifically, the MRWNN is proposed to boost the approximation performance of a previously reported network by employing
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Experimental investigation to evaluate total energy release rate for unidirectional glass/epoxy composite under Mixed mode-I/II load Sādhanā (IF 0.849) Pub Date : 2020-10-06 Abilash Desai, C M Sharanaprabhu, S K Kudari
In this paper, the total energy release rates for unidirectional glass/epoxy composites were evaluated using Compact Tension Shear (CTS) and Four-Point Bend (FPB) Mixed mode (I/II) fracture specimens. Unidirectional glass fibre laminates were considered for the experimental work. Specimen plates of required thickness were fabricated using hand lay-up technique. The experimental study was conducted
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Machinability study of Ti-6Al-4V alloy using solid lubricant Sādhanā (IF 0.849) Pub Date : 2020-09-30 Asit Kumar Parida, Paruchuri Venkatswar Rao, Sudarsan Ghosh
Cutting tool suffers rapidly during machining titanium-based alloys due to low thermal conductivity. Thus most of the heat is concentrated on the tool rather than chip during machining. To overcome this problem, a suitable cutting parameter, tool geometry, and sustainable methods are necessary. This paper presents the effect of MoS2 solid lubricant (SL), cutting speed, and nose radius during turning
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A compact SIW bandpass filter using DMS-DGS structures for Ku-band applications Sādhanā (IF 0.849) Pub Date : 2020-09-25 Banu Priya Annadurai, Umma Habiba Hyder Ali
This paper presents a design of compact SIW (substrate integrated waveguide) bandpass filter for application in Ku-band Transmit up-convert frequency (i.e., 13.7–14.1 GHz) used for satellite communications. Based on Defected Microstrip Structure-Defected Ground Structure combination (DMS-DGS), this SIW filter structure is designed to improve passband and stopband performance. By merging circular ring
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Large-scale testing and finite-element simulation of twin square anchor plates embedded at shallow depth in layered soil media Sādhanā (IF 0.849) Pub Date : 2020-09-25 V Srinivasan, Priyanka Ghosh
The motivation and scope of the present work are to investigate the interaction phenomenon of two closely spaced square plate anchors through physical modelling and validating it with the help of finite-element modelling. In the present study, different sizes of plate anchors are considered for studying their uplift behaviour when they are laid as single as well as in a group of two symmetrical anchors
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Optimization of the growth of GaN epitaxial layers in an indigenously developed MOVPE system Sādhanā (IF 0.849) Pub Date : 2020-09-25 Abhishek Chatterjee, V K Agnihotri, R Kumar, S Porwal, A Khakha, G Jayaprakash, Tapas Ganguli, T K Sharma
Growth of GaN epitaxial layers is optimized in an indigenously developed nitride metal organic vapour phase epitaxy (MOVPE) system. The motivation of present work is to develop a simple MOVPE reactor which is though affordable but can deliver GaN epilayers of desired quality. The design and fabrication methodology of nitride MOVPE system is briefly discussed. MOVPE growth of GaN epilayers is carried
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Distributed directional cooperative MAC (DD-CoopMAC) protocol for improving VBR throughput in IEEE 802.11ad WLAN Sādhanā (IF 0.849) Pub Date : 2020-09-25 Ilayaraja Venkatachalam, Senthilnathan Palaniappan, Sirajudeen Ameer John
The IEEE 802.11ad-based wireless local area network (WLAN) has emerged out as a promising network technology that is capable of operating on millimetre wave spectrum. This network is being used in many applications and can be extended to serve many different streams of the networking industry. However, the network still has some glitches with respect to throughput, overhead, etc., which need to be
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Computing prosody to detect the Arud meter in Punjabi Ghazal Sādhanā (IF 0.849) Pub Date : 2020-09-25 Muhammad Raihan Abbas, Khadim Hussain Asif
Ghazal is a very popular poetic form of Punjabi poetry. Every verse of a Ghazal follows the same rhythmical pattern. Punjabi Ghazal is written in Hindi meter and Arud meter. In this research, we deal with Arud meter. Arud is the science of versification being followed in Arabic, Turkish, Persian, Urdu, Hindi and Punjabi as well as some other languages of South Asia. It is a complex set of rules and
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Design, analysis, parameter evaluation and testing of a laboratory-fabricated brush-less DC motor prototype Sādhanā (IF 0.849) Pub Date : 2020-09-25 Pinaki Mukherjee, Mainak Sengupta
This paper presents detailed steps and procedures for the design of a 4-pole, 0.75-hp, 1500-r.p.m. surface-mounted permanent magnet brush-less DC (SPM-BLDC) motor. The motor has been fabricated at the works of a local manufacturer. The parameters of the machine have been analytically evaluated and subsequently compared to the experimentally determined values. Its practical performance on load has been
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Devanagari Handwritten Character Recognition using fine-tuned Deep Convolutional Neural Network on trivial dataset Sādhanā (IF 0.849) Pub Date : 2020-09-23 Shalaka Prasad Deore, Albert Pravin
In order to rapidly build an automatic and precise system for image recognition and categorization, deep learning is a vital technology. Handwritten character classification also gaining more attention due to its major contribution in automation and specially to develop applications for helping visually impaired people. Here, the proposed work highlighting on fine-tuning approach and analysis of state-of-the-art
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A strong intuitionistic fuzzy feature association map-based feature selection technique for high-dimensional data Sādhanā (IF 0.849) Pub Date : 2020-09-23 Amit Kumar Das, Saptarsi Goswami, Amlan Chakrabarti, Basabi Chakraborti
In this work, a graph-based approach has been adopted for feature selection in case of high-dimensional data. Feature selection intends to identify an optimal feature subset to solve the given learning problem. In an optimal feature subset, only relevant features are selected as “members” and features that have redundancy are considered as “non-members”. This concept of “membership” and “non-membership”
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Optimal two-stage parachute and retro motor sizing for launch vehicle stage recovery Sādhanā (IF 0.849) Pub Date : 2020-09-19 Pankaj Priyadarshi, Leya Joseph, Kamal Saroha
A deceleration system consisting of staged parachute clusters and retro thrusters is optimized for the recovery of the first stage of a launch vehicle on sea. Optimal mass as well as reduction in speed by each parachute cluster and the retro thrusters is essential to minimize the inherent payload loss due to inclusion of additional systems. Three disciplines are involved in the study, namely parachute
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Experimental investigations on cryo-machining of Hastelloy C-276 with tool wear characteristics Sādhanā (IF 0.849) Pub Date : 2020-09-18 J Kesavan, V Senthilkumar
The super alloy exhibits great strength and fatigue behaviour when nickel (Ni) is present in major quantities. Moreover, it possesses good corrosive resistant behaviour at high temperatures. However, these alloys are very difficult to machine under normal machining conditions due to their great strength and low heat dissolution. In this work, machining was performed on Hastelloy C276 under various
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An improved RNS-to-binary converter for 7-modulus set {2 n–5 –1, 2 n–3 –1, 2 n–2 +1, 2 n–1 –1, 2 n–1 +1, 2 n , 2 n +1} for n even Sādhanā (IF 0.849) Pub Date : 2020-09-17 M V N Madhavi Latha, Rashmi Ramesh Rachh, P V Ananda Mohan
In this paper a residue-to-binary converter for the 7-modulus set {2n–5–1, 2n–3–1, 2n–2+1, 2n–1–1, 2n–1+1, 2n, 2n+1} for n even is presented, which is an improved version of a reverse converter presented recently. The proposed converter needs less hardware resources ranging from 52.9% to 66.9%, conversion time of 68–70.7% and power dissipation of 47–63% of those needed for an earlier described converter
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Machinability of Ti-5Al-2.5Sn for electro-discharge machining: an experimental investigation Sādhanā (IF 0.849) Pub Date : 2020-09-14 Thrinadh Jadam, Saurav Datta
Present work attempts to investigate machinability of Ti-5Al-2.5Sn for Electro-Discharge Machining (EDM). Extent of machinability is determined through material removal efficiency, tool wear rate, and surface integrity of the EDMed specimen of Ti-5Al-2.5Sn. Detailed analysis of surface morphology followed by study of surface topographical features including surface roughness, crack density, thickness
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An application of evaporation-rate-based water cycle algorithm for coordination of over-current relays in microgrid Sādhanā (IF 0.849) Pub Date : 2020-09-11 Sagar Kudkelwar, Dipu Sarkar
Relay coordination is reliable and crucial to guarantee that healthy feeders are properly isolated from the defective areas in a microgrid network. An appropriate protection scheme must be properly planned during the design of the microgrid to ensure safety for the power components in the event of a failure. The implementation of distributed generators in the microgrid changes the total network’s Load-Flow
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Effect of individual phase properties and volume fractions on the strain partitioning, deformation localization and tensile properties of DP steels Sādhanā (IF 0.849) Pub Date : 2020-09-10 AMIT KUMAR RANA, SURAJIT KUMAR PAUL, PARTHA PRATIM DEY
Deformation band localization modes, uniform tensile strength, and uniform elongation of Ferrite-Martensite Dual-Phase (DP) steels are analyzed by finite element (FE) study. Treating the microstructure inhomogeneity as the sole cause of imperfection, failure initiation is predicted as the natural fallout of plastic instability caused by load drop because of localized plastic strain in the Representative
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Analysis of three-dimensional ponded drainage of a multi-layered soil underlain by an impervious barrier Sādhanā (IF 0.849) Pub Date : 2020-09-10 Subhadeep Chakrabarti, Gautam Barua
A general analytical model is proposed for predicting three-dimensional seepage into ditch drains through a soil column comprising of three distinct vertical anisotropic soil layers and underlain by an impervious barrier, the drains being fed by a distributed ponding head introduced at the surface of the soil column. The problem is solved for three different situations resulting from three different
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A novel optimization algorithm on surface roughness of WEDM on titanium hybrid composite Sādhanā (IF 0.849) Pub Date : 2020-09-10 Soutrik Bose, Titas Nandi
Titanium based alloys and composites have excellent strength and stability in high thermal condition, excellent resistance to creep, wear and corrosion, light weight and bio-compatible properties and are extensively used in defence, aerospace, spacecrafts, marine, automobile, sports and bio-medical applications. This paper presents an investigation based on a novel optimization algorithm called desirable
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A novel image compression model by adaptive vector quantization: modified rider optimization algorithm Sādhanā (IF 0.849) Pub Date : 2020-09-09 Pratibha Pramod Chavan, B Sheela Rani, M Murugan, Pramod Chavan
In recent days over the internet, the uploading of enormous new images is being made every day, and they necessitate large storage to accumulate the image data. For the earlier few decades, more analysts have evolved skillful image compression schemes to enhance the compression rates and the image quality. In this work, Vector Quantization is used, which uses the Linde–Buzo–Gray algorithm. As a novel
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Assessment of voltage changeability with reactive power source allotment for real time network Sādhanā (IF 0.849) Pub Date : 2020-09-09 BHAVESH VYAS, MUKESH KUMAR GUPTA, M P SHARMA
In this research work investigation of reactive power necessity at standard voltage level is practiced. The 39-bus test network modeled in mipower application is a part of Rajasthan power system, attached with North Regional National Grid synchronized at 765 kV voltage level. State power utilities are unable to obtain the profoundness in providing, static or dynamic compensation at multiple voltage
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Selection of teak sawdust polypropylene composite’s composition for outdoor applications using TOPSIS analysis Sādhanā (IF 0.849) Pub Date : 2020-09-08 Anil Kumar Yadav, Rajeev Srivastava
Selection of a material for their end use in engineering applications depends on the properties of materials. In this paper, physical and mechanical properties of teak sawdust-polypropylene composite are evaluated and most suitable composition for outdoor applications have been determined by using TOPSIS technique of optimization. Virgin and recycled polypropylene are mixed with teak sawdust to fabricate
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Characterization of laminar flame using high speed camera and spectrometer Sādhanā (IF 0.849) Pub Date : 2020-09-07 Manasa Ram Kotal, Somnath De, Soumyadeep Das, Swarnendu Sen
In order to improve flame stabilization in small scale combustors, there have been many research works going on non-premixed as well as on premixed flame. The present experimental study characterizes colour and shape of the premixed and non-premixed flames through a laminar co-flow burner. Various flame behaviors are observed and their stabilization limits are investigated at different fuel–air ratios
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Fluid structure interaction studies of human airways Sādhanā (IF 0.849) Pub Date : 2020-09-07 RAKESH KUMAR SHUKLA, VIVEK KUMAR SRIVASTAV, AKSHOY RANJAN PAUL, ANUJ JAIN
Study of flow characteristics of human airways using Fluid-Structure Interaction (FSI) analysis is very important in the context of prognosis, diagnostic and treatment of respiratory diseases. The present study is focused on effect of elasticity on the respiratory wall during inhalation. Airflow in Computed Tomography (CT) scan model with rigid and compliant airway walls is studied. FSI technique is
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