bluuebunny/crossref_metadata_2025 huggingface dataset:
New Era Chain Supply on Retail Food Industry in Indonesia
Authors: Foster Bob
Published: April 2021

The purpose of this study is to find out a new era in the supply chain of the food retail business in Indonesia. The development of the number of retail food actors is a phenomenon that occurs due to the support for the ease of opening retail food. Factors that support the growth of retail food at this time is the high level of mobility of people who are busy demanding speed and practicality, in any case, is no exception to the fulfilment of basic needs such as food. In the era of disruption, business change is very visible, the way of doing business which used to emphasize owning (ownership) becomes sharing (sharing roles, collaboration resources). The existence of phenomena such as go food, go send, go shop, goat, grab food, and other application-based media are developing in the latest era. This phenomenon changes the view of the supply chain, one of which is affected by the retail food business. The discussion in this research is about a new era in which there are supply chains, food retail business, the role of technology, marketing, distribution channels, and descriptive effectiveness. The study was conducted using qualitative descriptive methods, namely using literature or literature studies, using journals, books, magazines, and the web that are relevant to research. The conclusion in this research is the development in this era in distribution, warehousing, transportation, and services in food retailing supported by internet application-based providers including go food, grab food, etc. making it easier for retailers and consumers to transact. The development of this new era experienced many improvements in terms of delivery, cost, and time so that the more days the more effective the supply chain in the food retail industry.
User Acceptance of Virtual Hotel Operator Applications in Indonesia
Authors: Ramadhiana I N , Prakarsa G , Nasution V M
Published: April 2021

This research is based on the main problem, namely the lack of measurement of the integration of mobile factors in the VHO application. This research is categorized as quantitative research using descriptive methods, and using the technology acceptance model / TAM. The technique used is multiple linear regression, starting with the validity and reliability tests, as well as the heteroscedasticity test. The purpose of this research is to determine how much acceptance of VHO application users based on the Technology Acceptance Model (TAM). This research approach uses a quantitative approach with survey methods. The data collection technique is using a questionnaire that distributed randomly to users of the VHO application. The data analysis method used is descriptive analysis, using multiple linear regression techniques. The results of this study indicate that the variables of mobile perceived compatibility, mobile perceived financial resources, and mobile perceived risk have a simultaneous effect on the mobile variable perceived usefulness, the mobile variable perceived ease of use and the intention to use variable.
Disturbance Characteristics of Uninterruptible Power Supply System in the Frequency Range 9 - 150 kHz with Capacitive Load Level Variations
Authors: Pratama R L , Sudiarto B , Setiabudy R
Published: April 2021

Nowadays the use of Uninterruptible Power Supply (UPS) is common because UPS is able to provide a backup electrical power when the main source is disconnected or interrupted. With the use of a UPS, the supply of electrical power to the system will not be interrupted. When the UPS operates, the voltage go through dual conversion process, from AC to DC by the rectifier and from DC to AC by the inverter. The DC voltage in the UPS is used to supply the battery charger and the AC voltage is used to supply the load system. The switching process of the inverter can produce disturbances at high frequency. In this study, a 1 KVA UPS is connected to a capacitive load 3.6 µF, 7.2 µF, 14.4 µF and 28.8 µF which generate the highest disturbances voltage of 309.53 mV at a frequency of 9.8 kHz at a load of 28.8 μF and the lowest of 1.33 mV at a frequency of 110.6 kHz at a load of 3.6 μF. The disturbances voltage occur at three dominant frequencies of 19-24 kHz, 35-44 kHz and 105- 114 kHz and increases as the increase of capacitive load level.
IoT based Trash Can Monitoring System for Smart Garden Cleanliness
Authors: Moris F D , Widjaja D
Published: April 2021

Garbage is always produced every day, including household trash and many kind of waste. IoT based Trash Can Monitoring System was designed to automatically maintain the garden cleanliness and help to ease the cleaning staff work. This system uses two controlled trash bins with different location identity (ID). There are many devices to build this system, such as NodeMCU microcontroller, Thingspeak as an IoT platform, two ultrasonic sensors to detect the height of trash and approached object, two servo motors to control can cover and disposal outlet, and solenoid as a locking part. The results of this work show that the system designed works well. Location ID of the two trash cans, approached object detection, measurement of garbage height inside the trash can, opening and locking of disposal outlet and cover, work with 100% success rate and all data can be sent to Thingspeak without any error.
Inflation modeling in Indonesia using hybrid autoregressive integrated moving average (ARIMA)-neural network (NN)
Authors: Pratiwi D , Hadijati M
Published: April 2021

One of the macroeconomic indicators to see the stability of a country’s economy is inflation. This study aims to model the value of monthly inflation in Indonesia from January 2003 to December 2019 using the ARIMA-NN hybrid. The data plot shows a non-linear pattern and trends, so that the differencing process is carried out and the model is built using ARIMA model. The best ARIMA model obtained is SARIMA (1,1,0)(0,1,1)12 with a Root Mean Square Error (RMSE) of 0.01134. Furthermore, ARIMA residuals that do not satisfy white noise and normality are modeled using NN. The best structure obtained of NN model is (3×2×1) with an RMSE of 0.023984. From the ARIMA and residual NN prediction results, the ARIMA-NN hybrid model is obtained to predict the value of monthly inflation in Indonesia for the next 12 months with the Mean Absolut Percentage Error (MAPE) value is 11.40873%. It means that the model result has high prediction accuracy.
A discrete choice model of voters’ decision in the general election 2019 using LASSO regression
Authors: Irvani D , Notodiputro K A , Sartono B
Published: April 2021

Statistical modelling faces problems when too many variables are involved in the model. Using all variables in the model will result in overfitting which in turn produces unstable predictions. LASSO (Least Absolute Shrinkage and Selection Operator) is a method that can be used to overcome this problem. LASSO selects more important variables with the goal of improving the prediction accuracy and interpretability. This paper identifies factors those influenced voters in 2019 presidential election using LASSO penalized logistic regression. This logistic model is also known as a discrete choice model. The data used in this study is the result of an exit poll conducted during the election day with a total sample of 2,289 respondents. The response variable in this study is a vote choice. The independent variables include sociological, psychological, political economy, and campaign variables. The results showed that there were 17 of 27 variables having nonzero coefficients. These variables include candidates’ personal qualities which show the largest effect, followed by the incumbent performance variable. On the other hand, variables such as religion, education, and ethnicity have much less effects. This implies that the psychological and political economy factors played more important role than the sociological factor in determining voters’ decision. Based on this finding the prospective candidate in the future election should focus their campaign strategy on enhancing positive images (empathy, integrity and capability) as well as offering better programs to convince voters.
Analysis of Ionosphere disturbance caused by the Lokon Volcano Eruption using GPS TEC data
Authors: Pandara D P , Muslim B , Sunardi B , Ferdy  , Pasau G , Mananohas M , Ango Ch
Published: April 2021

Eruption of Mount Lokon has the potential to cause danger to the community. The study of the ionospheric disturbances triggered by Lokon activity is very important to determine eruptive behavior. TEC anomaly before eruption is succesfully detected using correlation methods. Based on GPS TEC data from the GNSS satellite it was concluded that the TEC anomaly occurred three days before the eruption on July 14th, 2011. Using leveling method and polynomial technique, eruption effects on ionosphere were be determined. Eruption on July 2011 caused ionospheric disturbance. These results will be important considerations in decision making related to disaster mitigation
Physical Properties of Bio-Composite Board Reinforced with Shell Particle and Coconut Fiber
Authors: Rachmawati D O , Widiarini P
Published: April 2021

The properties of the particles which have best binding capacity with the matrix can be combined with the properties of the fibers which give the composite strength. The use of shell particles and coconut fiber together as a composite reinforcement provides a variety of new physical properties that are different from its constituents. Therefore, the variation in weight fraction of the two fibers as reinforcement is interesting to study. The bio-composite board was made to use open mold process. The bio-composite board reinforced with shell particles and coconut fiber has a density of 0.938 ≤ ρ ≤ 1,020 g/cm3. The greatest water content reaches 5.43%. The immersion time of 24 hours, water absorption of this bio-composite board is in the range of 1.95% to 3.38%, and the largest thickness swelling reaches 2.86 %. Bio-composite board which is composed of 40% by weight of coconut fiber has a density of 1.111 g/cm3. Water content reaches 5.90%%. Water absorption capacity and thickness swelling of 4.08% and 3.12%, respectively. While the bio-composite board which is composed of 40% by weight of shell particles has a smaller density, moisture content, absorption capacity and thickness expansion, namely 0.901 g/cm3, 4.13%, 1.61% and 1.18%.
Effect of Storage and Ageing Time on Sensorial Quality and Composition of Wine Phenolic Compounds Improved with Saccharomyces Cerevisiae Local Hybrid
Authors: Tika I N , Agustiana I G A T , Puspaningrat L P D
Published: April 2021

High quality wine can be produced by the perfect ageing process.The purpose of this study was to determine the effect of ageing process container on sensory quality and composition of phenolic compounds of wine fermented with local hybrid Sacharomyces cereviciae. The research design used a randomized block design with two factorials. The first factor is the materials for storing during the ageing process, namely plastic bottles, glass bottles and pottery barrels (from Banyuning). The second factor is ageing time, namely 1, 2, 3, 4 and 5 months. The experiment was carried out two times over so that 30 experimental units were obtained. The variables measured were phenolic compounds and sensory quality (aroma and taste, color, and turbidity level). The composition of the phenolic compounds was determined by gas chromatography-mass spectrometer (GC-MS) and sensory quality test using 15 trained fanelis. The results showed that the composition of the highest phenolic compound content was shown successively with containers: plastic bottles, glass and earthenware and the ageing time was 4 months. The content of phenolic compounds is Isoamyl alcohol (ISM), Isobutanol (ISB), n-propanol (PR), Acetaldehyde (ADE), 2,3 –Butanediol (BUT), Acetone (ACE), while the best sensory quality is using pottery. because it has better aroma and taste, lower turbidity level. Based on data analysis, it can be concluded that the length of time for the ageing process and the container during the ageing process has a significant effect on the quality and content of phenolic compounds in grape wine fermented with local hybrid Sacharomyces cereviciae.
Overproduction and Purification of Organomercuric Lyase (MerB) from Mercury-resistant Bacteria Pseudomonas aeruginosa Isolate 4B2
Authors: Fatimawali  , Kepel B J , Tallei T E
Published: April 2021

Mercury is a very toxic element even though there is very little concentration in the body. Although all chemical forms of mercury are toxic, public health attention is focused on organic mercury which is the most toxic form of mercury. Organic mercury can, however, be detoxified by organomercuric lyase (MerB) protein derived from mercury resistant bacteria. This study aims to overproduce of MerB protein by transforming merB gene into E. coli BL-21(DE3). Nucleotide sequence of merB gene of mercury resistant bacteria Pseudomonas aeruginosa isolates 4B2, optimized by using gene program designers (www.dna20/com) then commercially synthesized and cloned in pET16b expression plasmid vector. Plasmid pET16b_merB (syntetic gene) was transformed into E. coli BL21(DE3) to produce MerB protein recombinant, induced with isopropyl-β-D-thiogalactopyranoside (IPTG) and purified by imidazol. Overproduction and purification of MerB protein was successfully performed in E. coli BL21 mediated by plasmid pET16b, resulting MerB protein with a molecular weight of 25.6 kDa, with the optimum at 37°C incubation temperature, incubation time of 3 hours and 0.1 mM IPTG induction. MerB protein obtained can be used in further research on the enzymatic detoxification of organic mercury.
The Clique Numbers and Chromatic Numbers of The Coprime Graph of a Dihedral Group
Authors: Syarifudin A G , Wardhana I G A W , Switrayni N W , Aini Q
Published: April 2021

The graph has many properties and characterizations. One interesting topic to discuss is the clique numbers and chromatic numbers. This research will determine the clique numbers and chromatic numbers of the coprime graph of the dihedral group. One of the main results is if n = 2k then the chromatics numbers of the coprime graph of the dihedral group are 2, and if n is odd composite numbers, then the clique numbers and chromatics numbers are (m + 2).
Propagation and Characteristic of Tsunami Wave in Lembeh Strait, North Sulawesi, Due to the Earthquake in the Molucca Sea
Authors: Tamuntuan G H , Mambu B B , Pasau G , Mandagi A T , Pandara D P , Ferdy
Published: April 2021

Modeling the propagation of a tsunami triggered by an earthquake with a hypocenter in the double subduction of the Maluku Sea using the TUNAMI-N2 program has been carried out. The objectives of this research are to find out the model of tsunami propagation towards Bitung City, how the effect of Lembeh Island on tsunami waves, and the characteristics of the waves that occur in the Lembeh Strait. The modeling uses two earthquake scenarios with different magnitudes which are 7.5Mw(scenario A) and 8.0Mw(scenario B). The results show that the wave propagation model towards Bitung City in the two scenarios is relatively the same, but has a different arrival time and wave height depending on the earthquake energy of the tsunami generator. The arrival time of the tsunami waves in Lembeh strait area, the strait between Bitung City and Lembeh Island, was relatively slower indicating that Lembeh Island could serve as a tsunami barrier for Bitung City. The characteristics of the tsunami waves in Lembeh Strait are also different from the areas outside the strait. This is due to the effects of diffraction and wave superposition that occur in the strait area. The characteristics of the waves that occur inside and outside the Lembeh Strait are important things to know in order to determine a more optimal tsunami disaster mitigation strategy in Bitung City.
A Review on Modelling, Design and Optimization of Forging Process
Authors: Kumar Dhiraj , Mondal Sharifuddin
Published: April 2021

Forging is a core manufacturing process. It gives a product of superior mechanical properties and produces minimum wastage of material. This makes it a better manufacturing process as compared to other processes like casting etc. An aligned grain flow defines a good forging. The effectiveness of a manufacturing process is characterized by low cost, high productivity and high quality of product. This necessitates the use of three dimensional computer graphics and powerful Computer Aided Engineering (CAE) software to analyze the forging process. The present paper discusses on the various research works carried out in different fields of forging. The scopes of further researches on different problems of forging are also elaborated.
Comparison of the most harmful defects present in a steel pipe that can cause fatigue failure
Authors: Mighouar Zakaria , Khatib Hamza , Zahiri Laidi , Mansouri Khalifa
Published: April 2021

Steel pipes used for conveying pressurized fluids are often defective due to manufacturing error, improper handling or construction materials. These defects may be in the form of cracks which propagate until the mechanical structure is fractured, or in the form of dent which produce a local concentration of stress and thus weaken the structure. In this paper, we will present a numerical model for estimating the accumulation of damage that takes into account the effect of the loading history. This model will be used to evaluate the harmfulness of a dent on the one hand, of a semi-elliptical crack on the other hand. These defects wil be considered to be present in a metal tube subjected to internal pressures caused by the water hammer phenomenon. A parametric study will make it possible to conclude the most harmful defects among the defects studied.
Experimental Study of Tensile, Flexural and Impact Strength of Basalt/Glass FRP Hybrid Composite with Carbon Black
Authors: Mithilesh K M , Mahesh Dutt K
Published: April 2021

Metal components have been replaced by composite ones in the modern engineering aspects due to various reasons such as strength to weight ratio, ease of manufacturing as well as aesthetic value. Currently majority of composites are made by using synthetic fibres which again is a concern for the environment because of non-biodegradability issues with synthetic fibres. Hence natural fibres appear to be an alternative option to synthetic fibres. But the major drawback would be the strength of the fibres and its behaviour with its surrounding environment hence hybrid appears to be the possible solution in order to balance both the constraints of strength and environment. This study describes the mechanical properties of a hybrid composite comprising of Basalt fibre and Glass fibre developed by using hand lay-up techniques. Woven Basalt fibres and Glass fibres were used for fabricating the hybrid composites, carbon black as nano fillers, vinyl ester resin as matrix with different fibre stacking sequences. The result shows that the reinforcement of woven Basalt and Glass fibres hybrid composites with carbon black has a significant influence on the mechanical properties of the composites. The stacking sequence also has an effect on the strength of the specimen. The tensile strength of hybrid composite having stacking sequence B/3G/B/3G/B increase by 15.49 % with the addition of 9% carbon black whereas the stacking sequence G/3B/G/3B/G has a decrease in tensile strength by 21.77%. The flexural strength of the hybrid B/3G/B/3G/B decrease by 72.5% with the addition of carbon black while the hybrid G/3B/G/3B/G shows an increase by 32.38%. The highest impact strength is of basalt with 6% composite.
An environment friendly synthesis and characterization of Zinc Oxide nanoparticles using Mentha viridis leaf extract
Authors: Chowdhury Rashedul Alam , Hassan Md. Mahmudul , Das Shaon , Aninda Dhar Sajib , Moniruzzaman Md.
Published: April 2021

Zinc Oxide Nanoparticles (ZnO Nps) are one of the most predominant inorganic nanoparticles, which have diverse applications in the field of cosmetic, coating, medicine and electronic sensors. Morphology and particle size of nanoparticles mainly control its advantages and drawbacks in applications. In this study, an environment friendly and economic synthesis of ZnO Nps was carried out using Mentha viridis leaf extract as reducing and stabilizing agent to investigate the morphology, particle size and other properties of the synthesized ZnO nanoparticles. A series of characterization methods: ultraviolet-visible (UV-Vis) spectroscopy, x-ray diffraction analysis, field emission scanning electron microscopy (FESEM) and energy dispersive x-ray analysis (EDX) were used to confirm the characteristics of the synthesized nanoparticles. It was evident from the XRD analysis that ZnO Nps possess a polycrystalline hexagonal structure (as per the International Centre for Diffraction Data (ICDD) number #98-002-9272) with an average crystallite size of 32.3 nm. The spectra showing peaks in the EDX data indicated the presence of Zn (50.35 %) and O (49.65 %) in higher percentage and FE-SEM analysis revealed the morphology and Average Length and diameter of the nanorods are 156 nm and 48 nm respectively of the synthesized ZnO Nps. The analysis of the UV visible absorbance spectrum revealed the absorbance band peak at 372nm and confirmed the presence of ZnO Nps. From all these analyses, it is evident that Mentha viridis leaf extract can act as a potential reducing agent in the green synthesize ZnO Nps.
Effect of Welding Parameters on Angular Distortion of Submerged Arc Welded Low Carbon Steel Plates
Authors: Kashish  , Chaudhary Charu Singh , Khanna Pradeep
Published: April 2021

Submerged Arc Welding is an important industrial joining process used extensively for welding of thick plates. Hence, finds utility in heavy fabrication industries like ship building and pressure vessel industry. The process is characterized as a high heat input process which sometimes leads to certain weld abnormalities of which angular distortion is the one. The present work is an attempt to analyse the effect of input welding parameters like Wire Feed Rate, Voltage and Welding Speed on angular distortion which is a response parameter. Angular Distortion is caused because of the non uniform thermal stresses experienced by the top and bottom surfaces of the weld with top surface getting the maximum and the bottom surface getting the minimum thermal effects. This causes top surface to experience more contraction as compared to bottom resulting in distortion of weld across the line of weld known as angular distortion. This distortion may result in rejection, scrap or misfit of the weldment with parent structure. It is therefore important to keep this defect to a minimum and the present study is an attempt to work in this direction. The results are expected to be of practical importance from the industrial viewpoint.
Third Order Band Pass Filter With Double-Gate MOSFET: A Simulation Perspective
Authors: Naidoo Danurshan , Srivastava Viranjay M.
Published: April 2021

It is an extended version of the mathematical analysis of the proposed 3rd order Band Pass Filter (BPF). This device design uses the Double-Gate (DG) MOSFET’s which provides a better performance and reliability of the band pass filter. This 3rd order BPF design improves the device performance characteristics, such as enhanced power efficiency and switching capabilities, due to the properties of DG MOSFET technology. Simulation analysis of the proposed filter model has been performed. The BPF model has been designed for lower and upper cut-off frequencies of 100 kHz and 1.7 MHz, respectively. The 3rd order BPF filter has been modeled to have Butterworth characteristics, thus having a maximally flat pass-band response.
Effect of Welding Parameters on the Weld Bead Profile of Submerged Arc Welded Low Carbon Steel Plates
Authors: Chaudhary Charu Singh , Kashish  , Khanna Pradeep
Published: April 2021

Welding of thick and long steel sections with minimal requirements of etch preparation has posed a challenge to the fabricators to have a reliable and good quality joint. Such requirements are successfully catered to by the submerged arc welding process which was developed in early 40s to weld thick hull sections of naval ships. The process has since been used extensively in heavy fabrication industries like ship building, pressure vessel and rail industries. The strength and quality of weld produced is decided by its bead parameters like depth of penetration, bead width and reinforcement height. It has been found that weld parameters like wire feed rate, voltage welding speed nozzle to plate distance, torch angle and flux composition have influence on bead parameters. Present work is an attempt to develop a mathematical relation between bead parameters and input parameters so that an empirical relation can be developed between them Full factorial approach with 2 levels and 3 factors is used and graphical depictions are used to analyse the result
Study on Design and Analysis of Industrial Y Type Strainer
Authors: Patel Mohammed Ather , Saheb Shaik Himam
Published: April 2021

Industrial Strainers are widely being used in Various Heavy Mechanical Industries such as Petro Chemical, Oil and Gas, Steel industry, Water Treatment and Process Industries. The Main purpose being Removal of unwanted Materials in pipelines is a never ending one. Whether the Flowing Material as Sea Water, Oil, Paint or variety of Food or Chemical products. The cause of damage might be dirt, foreign matter or even Clamps of the Product. The Main widely used Industrial Strainers are Basket, Magnetic, Duplex, Y-Type, Tee type and conical strainer. The material used in overall Manufacturing of the Different Strainers is MS (Mild Steel), SS (Stainless Steel). The most efficient of all the strainers Duplex Strainer, because of its large design ratio and larger Material Handling Capacity. The Main Purpose of this Research is to Study Design and Materials involved in the manufacturing of Y-Type are being mainly used in the fluid pipelines in order to Filter Out the impurities, Foreign Particles and protect the downstream.
Energy recovery of sewage sludge treatment by anaerobic co-digestion
Authors: Tran Thanh , Nguyen Kieu Lan Phuong , Thi Van Doan , Giang Lam Van , Tan Lam Van
Published: April 2021

Sewage sludge produced from wastewater treatment is one of the challenges facing many countries in their development process; therefore, the sewage sludge needs treating suitably. Besides, recovering energy from waste to save operating costs in treatment plants is also being considered. The study was conducted by mixing urban sludge samples with substrates (agricultural residues) to create different C/N ratios from 16.6 to 32.5, then evaluating the quantity and quality of methane) the gas generated from the test pieces. This method not only solved the environmental problem but also had benefited from biogas produced from the digestion process. The initial results showed that the quantity of biogas from anaerobic co-digestion of sewage sludge and rice husk (ratio 4:1) are 160ml/g VS. Furthermore, the quality of methane can be up to 60% and near twice as much as mono-digestion. The study results estimate that the potential of recovering electricity from the sludge for the wastewater treatment plant of Binh Hung (Vietnam) is about 0.2 MW/year or higher.
Optimisation of Drilling Parameters of Metal Matrix Composites using Genetic Algorithm in the Taguchi Method
Authors: Rao C V Subba , Rao Y Sesha , Marimuthu P , Jeyapaul R , Chakravarthy N S Kalyan , Murugesan P
Published: April 2021

This work presents the machining parameters optimization on machining metal matrix composites using genetic algorithm in the Taguchi method with the objectives of minimization of surface roughness, cutting force, maximization of metal removal rate, cutting power, specific cutting energy, cutting power and machining time. Experiments were conducted on aluminium silicon carbide Metal Matrix composite using TiN coated HSS twist drills. Optimal setting of parameters have been identified using Taguchi Technique and Genetic algorithm. Genetic algorithm is developed in ‘C’ language. The presented work gives a better results and it can be used for any machining parameter optimization in solving multiple response problems.
Conductivity tensor in cylindrical quantum wire with infinite potential for the case of electron-optical phonon scattering
Authors: Ngoc Hoang Van
Published: April 2021

Conductivity tensor characterizes the conductivity of the material, this work calculates the conductivity tensor in a cylindrical quantum wire with infinite potential in the presence of two external fields, the laser field and linearly polarized electromagnetic wave field. The problem is also only considered for the case of electron-optical phonon scattering. By using a quantum kinetic equation for electrons in a quantum wire in the presence of two external fields, the conductivity tensor is calculated. The expression for conductivity tensor shows its dependence on the frequency and amplitude of the external field as well as other parameters specific to the system The figure of the dependence of the conductivity tensor to the external field will be investigated and plotted for the quantum wire GaAs/GaAsAl.
Stability study for the rehabilitation of the protective dike of the port El Jadida (Morocco)
Authors: Laila Mouakkir , Mustapha Mouhid , Hassan Ayad , Brahim Bouni El , Mohamed Chagdali
Published: April 2021

In this study, we are interested in the stability study and reinforcement of protective structures represented by the breakwater of the port of El Jadida. This study is based on the numerical modeling of the interaction of the swell with an embankment dam. The swell simulation parameters were simulated using the SWAN model [1]. The results of this modeling show that the most constraining swells likely to reach the project site are the swells of 14s and 18s of 50 years and 100 years return period and that the residual swell heights are between 1.63 m and 1.96 m maximum. The redefinition of the project swell based on this numerical modeling makes it possible to resize the components of the protective dike by the Hudson formula [2].
Stress evaluation of CSZ and SiAlON under Thermo-Mechanical loading condition
Authors: Vigneshwaran M. , Srisanthosh S. , Nandhakumar J. , Madhubalan R. , Chandran Vaisak R
Published: April 2021

This work deals with the Thermo-mechanical analysis of Thermal barrier coating over Aluminum 2026 alloy through Finite Element Method in ANSYS 15.0R software. The coating material is Nano composite (metal matrix). It consists of double ceramic layer (TC1, TC2) with a layer of bond coat (BC) between the substrate (SUB) and the ceramic layers. The top Ceramic layer is of a new kind of refractory material with better oxidation resistant and corrosion resistant above 1000oC. The inside ceramic layer is well known for thermal resistant. In order to give a better bonding strength, the grain size of the coating powder is maintained at Nano scale. A Finite Element model has been developed to identify the intermittent temperature of the coatings under thermal loading conditions. From this FEA result the model was subjected to thermo-mechanical stress analysis to find out the stress distribution over the coatings and the substrate. We analyzed with three different temperatures in the same model. The result shows that the double ceramic layer will reduce the Substrate temperature effectively. The interfacing area and the edges of the coating experience more stresses when compared to other area. The paper reveals that the coated material’s stress concentration is very less when compared to the uncoated material.
Strengthening of Soil by adding Lime and Glass Fiber as Stabilizing Materials for the Construction of High Rise Buildings
Authors: Naidu Gopu Ganesh , Ramakrishna Ravulapalli , Ezri Babu G
Published: April 2021

The main aim of this research is to increase the strength properties of the weak soil by using stabilizing materials for the construction of high raised buildings on weak soils. As we all know that the most important thing in construction industry is soil. In this research we are adding stabilizing materials like lime and glass fibers to the weak soil to increase the strength parameters of the soil. The addition of stabilizing materials and admixtures to the soil leads to the increase in the strength parameters of the soil. There are various Infrastructural projects which are constructed on the soil, in many of these cases the black cotton soil is not suitable, because the Black cotton soil is weak in strength and which has low engineering properties. Black cotton soil has more swelling property and high shrinkage nature. To overcome these problems and to improve the engineering properties of the black cotton soil, we are adding Lime and Glass fibers as the stabilizing materials in the weak black cotton soil. The engineering properties like strength, compressibility and bearing capacity of the soil were increased by stabilizing the weak soil these stabilizing materials. This work mainly concentrates on the feasibility of the usage of lime and glass fibers as the stabilizing materials for the black cotton soil. The percentage of Lime and glass Fibers used in black cotton soil varies in different proportions like 2%, 4%, 6%, 8% and 10%. All the necessary tests were conducted to get the results. The properties like Liquid limit, Plastic limit, Compaction characteristics values and Differential free swell index of soil have been studied in this research.
Eco Bricks from Industrial Wastes such as Tannery Sludge and Sugarcane Bagasse Ash
Authors: Rose Enid Teresa A , Uma Maguesvari M , Yugasini S , Muthaiyan P
Published: April 2021

Clay bricks are one of the prominent construction materials. Due to the usage of Bricks in abundance in construction sector and manufacturing of quality clay bricks from fertile raw materials, admixtures etc., the world is in need of alternatives to prevent the depletion of clay from agricultural lands.. The tannery sludge which is disposed as a landfilling material, is a potential substitute for brick making. In addition, bagasse ash with high silica content, which is a waste disposal from sugarcane industry wastes, might be incorporated with sludge in brick manufacturing. In this paper, an attempt has been made to manufacture Eco Brick made from tannery sludge and bagasse ash with clay. Tests were carried out on Eco Bricks manufactured from various composition of Sludge and bagasse ash and it has been proven to be an effective alternative material in construction industry.
Assessment of strength and durability parameters for concrete with partial replacement of coarse aggregates by iron slag and glass powder as an additive
Authors: Prakash Akula , Swaminathen A.N. , Ramu Akoju , Chaitanya Bypaneni Krishna
Published: April 2021

Global warming and environmental destruction have become the major issue in recent years. Use of more and more environmentally friendly materials in any industry in general and construction industry, is of more importance. Preventing the depletion of natural resources and enhancing the usage of waste materials has become a challenge to scientists and engineers. Waste glass in one material when grounded to a very fine powder shows pozzolanic properties which can be used as additives, Iron slag rendered as scrap is used as partial replacement of aggregate in concrete. Iron slag is an industrial waste by-product of steel industry. The present investigation deals with the usage of Iron slag as a partial replacement of coarse aggregate and addition of glass powder to the concrete. The optimum percentage of iron slag to be replaced is found out by conducting 28 days compressive test on cubes of size 150mm*150mm*150mm with 5%, 10%, 15% replacement of coarse aggregates with iron slag. The glass powder is added with percentage of 5%, 10%. With the overall percentage of iron slag and glass powder the workability of concrete is checked and cubes are casted and tested for its compressive strength and durability parameters like saturated moisture content, effective porosity, sulphate attack and carbonation depth
Strength properties of double blend and triple blend self-compacting concrete subjected to different curing methods
Authors: Rao Tadivaka Venkateswara , Seshagiri Rao Meduri V , Rao Pasumarthi Jagannadha
Published: April 2021

The behaviour of Self Compacting Concrete is complex with the addition of both chemical and mineral admixtures. The use of supplementary cementing materials such as Metakaolin, FlyAsh, GGBS and Silica fume is required to improve the flow properties of fresh concrete, to decrease the cement contents, to increase the strength as well as durability of cement and to reduce cement consumption for environmental and economical concern. The hydration mechanism, strength, and setting characteristics of SCC are all influenced by the curing process. As a result, the findings of an investigation into the effects of curing methods on the compressive strength of SCC using Metakaolin as the primary supplementary cementing material are described in this paper. FlyAsh, GGBS and Silica fume are used individually for triple blend binders with OPC and Metakaolin. The Grade of concretes made were Standard concretes of M50. The concretes’ compressive strengths were assessed at 7 and 28 days. The traditional water pond approach was used as a reference, and wax-based liquid membrane and polymer-based liquid membrane curing compounds were used for testing. To reduce the water cement ratio and increase the flow and filling capacity of SCC, a superplasticiser based on a polycarboxylic ether polymer with long lateral chains is used. The performance of the Polymer based membrane curing compound is better than Wax based membrane curing compound. In addition to this, the polymer based membrane allows plastering and painting over the concrete surface. The early gain in strength is observed in all the membrane cured cubes at 7 days, but the rate of gaining strength is reduced after 7 days when compared with the Water pond cured cubes.
Experimental and Numerical Investigation of Residual Stresses in low pulsed Laser Shock Peening on AA7075 T651
Authors: Abeens Qingbo , Rajasekaran E. , Premnath M. , Sarukasan D , Muruganandhan R. , Thirumavalavan K.
Published: April 2021

Laser shock peening (LSP) is the emerging technology among several severe surface treatment processes for improving mechanical characteristics of metallic materials by producing compressive residual stresses. Though several LSP experiments have been done on compressive residual stresses, scare amount of studies concentrated on numerical investigation of residual stresses in LSP. The objective of this article is investigation of the experimental and numerical study of compressive residual stresses on AA 7075 t651. In the experiment, residual stresses analysis is performed. The sin^ method was utilized for measuring residual stresses. The three-dimensional (3-D) finite element method (FEM) analysis was applied to simulate the LSP on AA 7075 t651. The simulated and measured results showed good agreements. The numerical study was utilized to determine the compressive residual stresses.
Effect of Doping Rare-Earth Element on the Structural, Morphological, Optical and Photocatalytic Properties of ZnO Nanoparticles in the Degradation of Methylene Blue Dye
Authors: Habib I.Y. , Zain Nuraina Mohamad , Lim Chee Ming , Usman A. , Kumara N T R N , Mahadi Abdul Hanif
Published: April 2021

ZnO has been widely explored as a remarkable photocatalyst for the degradation of wide ranges of organic pollutants. However, its photocatalytic activity could be enhanced through metal doping. In this study, a rare-earth element, Cerium was doped into the microstructure of ZnO nanoparticles (NPs) using deposition precipitation method to enhance its photocatalytic activity towards methylene blue degradation via UV light irradiation. The resulting degradation efficiencies (DEs) recorded in this study are ∼ 64 %, 85 % and 55 % respectively. Similarly, the recorded rates are also found to be 9 x 10 −3, 21 x10 −3 and 6 x 10 −3 respectively, which are well correlated with the DE values. This superior photocatalytic performance achieved by 1 % Ce doping could be attributed to the reduction in band gap of the pure ZnO NPs from 2.69 eV – 2.60 eV. Therefore, 1 % Ce was the optimum doping of Ce4+ ion into ZnO microstructure, which demonstrates that Ce4+ ion could be used as an effective tool for stabilizing the generation of the reactive oxygen species, slowing down the recombination of the photo-generated charge carriers as well as enhancing their separation. Therefore, the optimum Ce doping into the ZnO NPs could play a remarkable role in facilitating the structural, microstructural, optical and electronic properties of the ZnO semiconductor, and eventually enhanced its photocatalytic activity.
Application of Phase Change Materials in Solar Water Heating Systems for Thermal Energy Storage
Authors: Nagilla Dheeraj Kumar , Tyagi V. V. , Kadirgama Kumaran , Chopra K. , Pandey A. K. , Kothari Richa
Published: April 2021

One of the major drawbacks of solar water heating systems is unable to supply hot water during night time or off sunshine hours. The integration of phase change material with solar water heating systems is cost effective and efficient solution to overcome this major problem associated with solar water heating systems. The phase change material integrated with solar water heating system stores thermal energy during sun shine hours and this stored energy can be recovered during off shine hours or night time to produce hot water. The phase change material can be integrated with water tank of collector, evacuated tubes, external water tank for solar collector and flat plate collector by adding layers at the bottom of absorber plate. The integration of phase change material with SWH system not only overcome the drawbacks of SWH system but also enhance the efficiency of conventional SWH system. Many investigations for the application of TES materials integrated SWH system have been carried out and found a significant enhancement in the performance. This paper presents a comprehensive review of recent advances in the applications of PCM with SWH system for TES.
Influence of SDBS Surfactant on Stability, Thermal Conductivity and Viscosity of h-BN/EG Based Nanofluids
Authors: Shahabuddin Syed , Shah Syed Nadeem Abbas , Sabri Mohd Faizul Mohd , Pandey A.K.
Published: April 2021

In present work, an experimental study was carried out to investigate the influence of anionic surfactant (SDBS) on stability, thermal conductivity and viscosity of h-BN/EG based nanofluids. The nanofluids were prepared via two-step method and characterized by using zeta-sizer, thermal property analyser and viscometer. The volume concentration of h-BN (0.05%) remains constant whereas SDBS volume concentration sweep from 0.05% to 2%. Current results indicate, the zeta potential increases with surfactant addition, but overall, zeta potential shows inverse relation with SDBS concentration. As the value reduced from -57.5mV to -40.5mV when SDBS concentration increase from 0.05% to 2%. While the particle size increase (396nm to 817.9nm) linearly with SDBS concentration due adsorption of surfactant molecules. On the other hand, thermal conductivity over temperature range 25°C-50°C shows maximum enhancement ∼6.57% at 25°C for 1 vol% SDBS. However, dynamic viscosity increase abruptly after 0.5 vol% of SDBS. Therefore, 0.5 vol% could be treated as the optimum SDBS concentration with reduced viscosity (∼2.85%) and increased thermal conductivity (∼3.26%) as compared to base fluid at 25°C. Potential of such optimum combination of nanofluids (0.05vol% h-BN with 0.5 vol% SDBS) may be manipulated in circulating fluid thermal management systems.
An Improved Mathematical Model Derivation Based on Circuitry Approach for Crystalline Silicon Photovoltaic Module
Authors: Teong K.L. , Tan Rodney H.G. , Hoo Landon Y.H.
Published: April 2021

This paper revises the five-parameter model, an approach that contributes the fundamental knowledge on performing accurate mathematical modelling for most of the commercially-available photovoltaic cells. However, such model can be further improved in order to increase the modelling accuracy while reducing the required modelling parameters at the same time. Improvement is made through formula derivation for photo-generated current and diode saturation current, while the remaining parameters (series resistance, shunt resistance, and diode ideality factor) remained un-managed for the parameterisation procedure. The derivations presented in this paper are direct, yet such procedures are frequently overlooked by others. The comparison between conventional and proposed modelling methods is presented. The methodology of this work is presented through MATLAB script demonstrated on the measured field data for 70W mono and poly-crystalline silicon photovoltaic modules. The performed methodology justifies that formula derivation can be applied for photo-generated and diode saturation current parameters that originated from five-parameter model. Such approach simplifies the works of parameterising the theoretical model matches with the experimental I-V curve. Generally, the work of this paper contributes to the mathematical modelling of photovoltaic module, simulation of experimental I-V curve result, and interactive education tool.
PV integrated on-demand water electrolysis system for HHO generation and it application as primary fuel in combustion
Authors: Ahmad Muhammad Shakeel , Butt T. Z. , Pandey A.K , Rahim Nasrudin Abd
Published: April 2021

The brown’s gas also known as HHO gas has been produced using dye cell alkaline water electrolyser using 316L stainless plates. The electrolyzer has been integrated with solar panel using battery bank and charge controller to develop on-demand HHO generation system. The produced gas has been employed as primary fuel for combustion and its effectiveness has been investigated. Preliminary observations revealed that the photovoltaic (PV) integrated alkaline water electrolysis system exhibits smooth operation and provides proper control over the production process. On the other hand, the utilization of HHO gas as primary fuel displayed highly satisfying results. The developed system has the capacity to generate HHO on the order of 3L/min at 15Amps and it almost instantly burn paper and acrylic sheet.
New Series Motor Four Quadrants Drive DC Chopper for Economical EV Part5: Parallel mode
Authors: Arof Saharul , Diyanah N.H.N. , Noorsal Emilia , Mawby Philip , Arof H.
Published: April 2021

This is part five of an eight-part series of a new Four quadrant dc chopper. The paper describes the parallel mode of the proposed Four Quadrants DC Chopper (FQDC) for a series motor. The mode is designed to overcome a disadvantage of dc series motors which is the speed reduction under load. First, it is studied via simulation using Matlab/Simulink model. Then the FQDC is experimentally tested on a 0.65kW series motor in a lab setup. Finally, a MATLAB/Simulink model is developed to apply the FQDC to a 35kW series motor that propels an electric car (EV). The results indicate that the proposed technique manages to prevent the speed drop of a dc series motor when loaded. This is evident when the EV is subjected to a hill climb.