bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of Floating Net Cage Based on Geographic Information Syatem in Lembeh Island
Authors: Kumaat Joyce C , Andaria Kalvin S , Maliangkay Denny
Published: May 2021

This study aims to assess the suitability and distribution of aquaculture with the KJA system on Lembeh Island. The method used in this research is quantitative research with the spatial analysis used in Geographic Information Systems supported by primary and secondary data to obtain information on the suitability of aquaculture land with the KJA system on the Lembeh Island. The results of the analysis of the suitability level of KJA aquaculture in Lembeh Island with a total area of observation area of 2395.38 ha. The results of the study show the suitability level of the KJA system aquaculture are Suitable (S1), covering 227.81 ha located in the South Lembeh sea waters covering 101.48 ha while in the North Lembeh sea waters covering 126.34 ha. Suitable needs (S2) covering an area of 1161.75 ha, which is located in the waters of the South Lembeh sea waters area of 774.51 ha while in the waters of the North Lembeh sea waters covering is 387.25 ha. Unsuitable (N) covering an area of 1005.81 ha located in the South Lembeh sea waters area of 245.54 ha and the North Lembeh sea waters covering an area of 760.28 ha.
Benefits and Barriers of Open and One Government Data: A Systematic Review
Authors: Ibrahim Adelina , Abdullah Saiful Do , Arief Assaf
Published: May 2021

Open, and One Government Data (OOGD) is a breakthrough in the concept of e-government services management which has become an international standard. The government, as a public institution, must be able to manage information and provide public rights through the implementation of OOGD. OOGD implementation will provide benefits and obstacles. The purpose of this study is to present the results of a systematic review related to the potential benefits and barriers to OOGD implementation. The Systematic Method use in this study by using the Reporting Item Options for Systematic Review and Meta-Analysis (PRISMA) methods. Based on summary and result classification, there are five categories of barriers to adopting Open and One Government Data such as data and technology, stakeholders, organizations, legislation, and policies.
Barriers and Challenges of e-Government Services: A Systematic Literature Review and Meta-Analyses
Authors: Arief Assaf , Ayub Wahab Iis Hamsir , Muhammad Miftah
Published: May 2021

Good Governance and Smart Governments are optimising the use of ICT to change the characteristics of traditional government bureaucracy to smart government. The government opens itself by applying information technology in providing services to the citizen, businesses, and government under it. We are familiar with the concept of the term e-Government. Success in implementing e-Government is undoubtedly a concern of the government because it is the responsibility of the executive side. In achieving success, we also must look for barriers ahead. This study aims to find barriers and challenges so the success can be made. In this article, we will discuss the barriers and challenges to be implementing e-Government. The method used is a systematic review and qualitative analysis of using content analysis in empirical and theoretical studies. The results show the 34 main Barriers dan Challenges of e-Government services both in theory and implementation to get the right strategies and recommendation to improve public services.
Study on E-Government Integration: A Theoretical and Empirical Review
Authors: Arief Assaf , Sensuse Dana Indra , Latif Lita Asyriati , Yunus Abbas Muhammad
Published: May 2021

The term e-government integration is important to realize an organization’s goal. The bureaucracy and procedures at government organization consume lots of effort, time, money, and sometimes holds back the success of the e-government integration goal. E-government Integration development is very complex with many stakeholders, users, and different procedures at each organization. Evaluation is needed to keep accelerating e-government integration. This paper-based on a systematic literature review and in-depth interview in local government structure on how to evaluate projects such as e-government integration on theoretical and empirical perspectives. This study contributes to a basis for building an appropriate implementation strategy for the e-Government maturity process. The result shows the methods and lesson learns for designing and evaluating the project of e-government implementation.
Nazief & Adriani Stemming Algorithm With Cosine Similarity Method For Integrated Telegram Chatbots With Service
Authors: Prismana IGLPE , Prehanto DR , Dermawan DA , Herlingga AC , Wibawa SC
Published: May 2021

Information systems have developed a number of questions that are often asked to customers service with a high level of question similarity. For help it create a FAQ related to information systems. The FAQ has a lot of information so that the user is confused and it takes time to find information. More users to ask questions to customer service. Chatbot is one way to help users and customers service in this matter. Customer service can answer questions automatically and users can ask questions as if to ask customer service live. In this study, researchers will apply Nazief & Adriani algorithm used to do stemming because this algorithm is an algorithm which is effective in stemming Indonesian, and method cosine similarity to find the similarity level of questions with FAQs that are in the FAQ database. With implement algorithms and methods in chatbot with the help of the Telegram Messanger service produce a relative answer according to that the user expected. This method is an effective way to answer questions automatically. And if the question asked did not find an answer or the answer is not suitable then the question will be conveyed in e-layanan Information technology development center of Universitas Negeri Surabaya.
Holdout Validation for Comparison Classfication Naïve Bayes and KNN of Recipient Kartu Indonesia Pintar
Authors: Tempola F , Rosihan R , Adawiyah R
Published: May 2021

Kartu Indonesia Pintar (KIP) is one of the leading programs in the field of Education in the current government era. At present in the provision of smart Indonesian cards often occur not on target. The selection process for smart Indonesian cards is not transparent. For this reason, a transparent selection process is needed so that it does not cause jealousy among students. One way to make the selection process more objective is by applying existing classification methods to data mining. The study applies two methods to see the comparison, namely naïve bayes and k-nearest neighbor. In addition, the algorithm validation stage uses holdout validation. The purpose of algorithm validation is done so that each data has the same opportunity in the training and testing process, in this study also applied 150 dataset, the results showed that the system with no validation algorithm naïve Bayes accuracy is better that is an average accuracy of 85.66% and an average accuracy of k-nn 84.89%. However, if algorithm validation is applied, the k-nn accuracy is better at 88.7% compared to naïve bayes which is only 81.3%.
Implementation Model of Vendor performance assessment for information technology service provider in PT. Krafthaus Yogyakarta
Authors: Usman AAH , Hamid M
Published: May 2021

Vendor performance assessments are important to improve the performance of vendors and to manage long time relationship between SMEs and their vendor. The case study used in this study was on SMES in Yogyakarta. Vendor performance assessment model in this study is using models that have been developed in previous studies. Criteria in the model are Honest, Responsibility, vendor reputation, communication, quality of vendor, timely delivery, price, document and administration, vendor location and flexibility. The implementation of the vendor performance assessment model at PT Krafthaus Yogyakarta aims to make PT Krafthaus easily assess the performance of the vendor and easy to manage the performance.
Radio Frequency Identification (RFID) Application Analysis on E-Toll in Indonesia
Authors: Hidayat Rachmad , Akhmad Sabarudin
Published: May 2021

This study researched the application of RFID applications to e-toll. This study analyzed the effect of perceived usefulness, brand image, and perceived risk to purchase decision either directly or indirectly with customer perceived value mediated. This research used Structural Equation Model (SEM) method. The results showed that there was significant influence perceived usefulness to purchase decision directly or mediated by customer perceived value. The effect of brand image on purchase decision directly was non-significant but significant if customer perceived value mediated. There was a significant direct influence perceived risk to purchase decision but non-significant if mediated by customer perceived value. Managerial implication of RFID application on e-toll was customer got easy of transaction, customer did not need to carry money while transaction and customer did not have long queue when did the transaction at toll gate.
Analysis and Design of the Integrated Management Information System of the Company (SIMANTAP)
Authors: Martini Dwi Endah Susanti , Wibawa Rindu Puspita , Wibawa Setya Chendra , Sulistiyo Edy
Published: May 2021

Production and distribution activities are carried out by combining various factors of production, namely humans, nature, and capital. From this management, of course, humans cannot manage existing data in the company manually continuously because it could be that data that has been recapitalized can be lost resulting in the company’s strategy to achieve success is a little hampered. This study proposes a design of an integrated management information system company that can manage human and financial resources in one application. The proposed application is called SIMANTAP, where the purpose and function of this application are to create, view, and manage all company data starting from employee data, inventory items, seeing company expenses and income in one media to make it easier for employees, admins, and managers to see information company. This application was developed by the waterfall method, with a case study of a company in Surabaya. This application is expected to support the company’s business, especially related to human resources and financial management.
Characteristic Testing Of Simulation-Based Photovoltaic Models
Authors: Usman U. , Sirad Mochammad Apriyadi Hadi
Published: May 2021

This article explains the evaluation of the characteristics of PV implemented in Simulink / MATLAB. The implanted PV model is a model of one diode with a series resistor, a model of one diode with a series and parallel resistor, and a model of Two Diodes with a series and parallel barrier. The results obtained by the PV model with two diodes with series and parallel series are the best because it has an I_mp and V_mp error that opposes the data sheet compared to other models. Increasing the temperature will cause an increase in I_sc, but cause a decrease in V_oc. While decreasing from standard temperature will cause a decrease in I_sc but causes an increase in V_oc. This condition is the opposite of solar radiation changes, whereas I_sc will decrease dramatically with decreasing solar radiation. The diode ideal factor for the PV performance characteristics will cause a maximum increase in power P_m. However, it does not affect the values of I_sc and V_oc. While the greater the value of R_s will cause a decrease in P_m, but it does not affect the value of I_sc and V_oc. This is inversely proportional to the effect of the value of R_sh, while an increase in the value of R_sh will cause an increase in P_m but does not affect the value of I_sc and V_oc.
Fingerprint Electronic Attendance Application
Authors: Darwis M , Niswaty R , Arhas S H , Rudi  , Jamaluddin
Published: May 2021

This study aims to determine the description of the application of fingerprint electronic attendance at the Center for Early Childhood Education and Community Education in South Sulawesi. This research is a quantitative descriptive. The study population was all employees, amounting to 136 people because of the large population, this study conducted 50 percent sampling so that the sample was 68 people. The techniques used in data collection are observation, questionnaires, interviews, and documentation. Data analysis is presented through a frequency table and processed through a score calculation technique. The data analysis technique in this study uses the percentage formula. The results of this study indicate that the effectiveness of the application of fingerprint electronic attendance at the Center for Early Childhood Education and Community Education in South Sulawesi has been implemented very well or very effectively. These results are seen from the aspect; target achievement, adaptability, job satisfaction, responsibility.
The Development of Analog and Digital Trainer Base on Arduino Uno in Microprocessor Programming Subjects
Authors: Sulistiyo E , Meduri NRH , Achmad F , Wibawa SC , Spoettï G
Published: May 2021

Based on observations in vocational schools, it was found that schools rarely had companion media in analog and digital learning, especially during the pandemic, students were not allowed to go to school. A media trainer is needed that can explain easily to students. The purpose of this research is to make analog and digital trainers based on Arduino Uno in microprocessor programming subjects, that are expected to solve these problems. The research method uses Research and Development (R&D) has 7 stages: (1) the potential and problem analysis stage, (2) the data collection stage, (3) the product design stage, (4) the product validation stage, (5) the product revision stage, (6) product trial phase, (7) data analysis and reporting stages. From the experimentation of making analog and digital trainers, the results obtained validation of the use of trainer assessment of 84.37%. It can be categorized as very valid as a companion media in learning. The validation of the use of job sheets is also categorized valid with a value of 81.6%. The overall results of students in responding to this trainer as a companion in learning were very good, 88.49%. So it can be concluded that an appropriate media can assist students in learning without the teacher, while based on validation and response states this media is valid and suitable to be used as a companion media in learning microprocessor programming. This trainer is recommended to be a learning medium for students with an explanation from the teacher to understand analog and digital material.
Effects of Gibberellin (GA3) Concentration on the Quality of White Java Plum (Syzygiumcumini)
Authors: Muharram Muhammad , Satria Bayu Aji , Rahardjo Tjatur Prijo , Supandji
Published: May 2021

White Java plum (Syzygiumcumini) is a native plant of Indo-Malaysia, which has been only infrequently in the wild and even more rarely when cultivated. That is because the quality of java plum fruit is very low, and hence affecting society’s demand for the fruit. This study aimed to determine the quality improvement of white java plum fruit due to the induction of gibberellins. There were several fruit quality parameters applied in the study, including seed size, fruit size, the weight of seeds and fruit, thick fruit flesh, and sugar content in fruit. The study was conducted at Kadiri University, Kediri City, East Java, in August-September 2019. The experiment employed a Completely Randomized Design with a single factor, which was the induction of gibberellins with 5 levels of concentration (0, 25, 50, 75, and 100 ppm) and 6 replications. The white java plum tree utilized as an experimental sample was 10 years old. The results showed that the induction of gibberellins at a concentration level of 75 ppm was able to improve the quality of the white java plum, in spite of the fact that, on average, the parameters were not significantly different from the concentration of 100 ppm.
Microplastics Ingestion by Skipjack tuna (Katsuwonus pelamis) in Ternate, North Maluku - Indonesia
Authors: Lessy Mohammad Ridwan , Sabar Mesrawaty
Published: May 2021

Microplastic (MPs) is a contaminant of concern worldwide. Rivers are implicated as significant pathways of micro-plastic transport to marine and lake ecosystems, and microplastic ingestion by freshwater biota is a risk associated with microplastic contamination, but there is little research on microplastic ecology within freshwater ecosystems. Microplastic uptake by fish is likely affected by environmental microplastic abundance and aspects of fish ecology, but these relationships have rarely been addressed. We measure the distribution and abundance of micro-plastic in skipjack tuna from 3 markets in Ternate. In total 948 MPs pieces were obtained in 16 fish samples. The identified MPs characteristics show that the micro-plastic character is categorized from the type of fiber, film, and fragment, while the colour of microplastic is black, red, blue, green, brown, grey, and white.
Two-Analytical Comparison on Force Measurements and The Wave Pattern
Authors: Joko Suranto P , Sulistyawati W
Published: May 2021

This work presents a comparison of two analytical methods on the components of resistance, transverse and divergent waves, and the profile and contour of the waves. Michell’s thin linearization theory is applied to estimate the wave resistance and analysis of the method compared to the solution of the wave resistance coefficient based on the Rankine source method. The hull of series 60 is utilized as the initial hull, and varying the shape of the bow to the mid-ship with the hull offset variable. Computation of the wave resistance coefficient at low Froude number (Fr<0.3) shows the results of the wave resistance from the thin ship theory are higher, but it gives a graphical agreement with the Rankine source method. The wave profile provides a very similar profile line for both of them. However, the thin ship theory does not establish a significant difference in the wave profile from the initial hull of the improved hull variation. Comparison of contour displays is presented in different versions of the wave contour. Still, it affords a good contour match on the initial hull and the results of hull variations from both methods. At high Froude number (Fr>0.7), the initial hull and variations in the hull have minimal effects with small differences in wave resistance, profile and contour.
The Effectiveness of Using Heaters on Mufflers to Reduce Exhaust Emissions from Spark Ignition Engines
Authors: Warju  , Nugraha Ata Syifa’ , Ariyanto Sudirman Rizki
Published: May 2021

The increasing population of motor vehicles can result in increased levels of exhaust emissions. The most significant contributor to exhaust emissions comes from motor vehicle exhaust. This study aims to reduce exhaust emissions, which will have an impact on reducing air pollution caused by motor vehicle exhaust gases. This research method is quantitative descriptive experimental with exhaust gas emission testing standards based on SNI 19-7118.3-2005. The test results show that the use of a heater in a Yamaha New Vixion Lighting motorcycle exhaust can reduce exhaust emissions CO and HC. By using an experimental exhaust one heater, it can reduce CO exhaust emissions by an average of 27.74%, and HC exhaust emissions by an average of 5.55. Whereas using experimental exhaust two heaters can reduce CO exhaust emissions by an average of 35.02%, and HC exhaust emissions by an average of 16.31.
The Effectiveness of Using Variations in Fuel Against Engine Performance 4 Steps 100 CC with Compression Ratio 8:1
Authors: Hidayatullah R S , Susila I W , Arsana I M , Warju  , Ariyanto S R
Published: May 2021

The compression ratio is one of the benchmarks in determining the appropriate fuel RON for motorized vehicles. The use of RON that is not following the manufacturer’s specifications can undoubtedly hurt engine performance. The purpose of this study was to analyze the effect of premium, pertalite, Pertamax, and Pertamax turbo fuels on engine performance. This research is experimental research where the object of study used is the Honda Supra X 100cc. The research instruments and equipment used included a dynamometer chassis and a blower as a cooling fan. The engine performance testing method is carried out according to the SAE J1349 standard. Meanwhile, the data analysis technique used descriptive methods. From the results of data analysis obtained from the study, it is concluded that the RON 88 is suitable for 3000-4000 rpm, while RON 90.92.95 is suitable for 4500-7000 rpm, in addition to motors that have a compression ratio of 8:1 they can use RON 90.92.95 without modification to the engine.
Vibration Analysis of Hybrid Composite Laminated Beam with Crack in ANSYS APDL
Authors: Danu Sunita , Saini Nitish Kumar , Nautiyal Deepak Prasad , Misra Anadi
Published: May 2021

In this paper, whole work is done for hybrid laminated composite beam which is made of three composite materials boron-epoxy, aramid-epoxy, and s-glass-epoxy. A numerical study, using finite element method is carried out to analyse the free transverse vibration behaviour of composite beam. ANSYS APDL is used as a finite element solver to simulate the free transverse vibrations. A variety of parametric studies is performed to check the effects of various parameters associated with crack geometry and laminate property on the three least natural frequencies. Parameters for the investigation are included as fibre volume fraction, ply angle for (0°/Φ°/0°/Φ°/0°/90°/(90-Φ)°/0°/(90-Φ)°/0°) stacking sequence, location of crack geometry relative to the restricted end, depth of crack (a) and support conditions (C-C & C-F configuration) for hybrid laminated composite beam, trend of the least three transverse natural frequencies is also discussed in detail. It is noted that maximum value of natural frequency occur at Φ equals to 90° for both (CC) and (C-F) and for relative crack depth 0.5 to 0.6, there is sharp decrement in natural frequency for (C-F). Other factors of laminate and crack geometry are also discussed in present analysis, which shows a great scope of this hybrid composite with (0°/Φ°/0°/Φ°/0°/90°/(90-Φ)°/0°/(90-Φ)°/0°) stacking sequence in the field of aviation and prosthetics.
Effect of flow velocity and pressure on carotid artery due to deposition of different shapes of plaque
Authors: Yadav Raman , Vashisth Sharda , Varma Ranjit , Kumar Kaushal
Published: May 2021

Atherosclerosis is the disease progressed because of the deposition of stenosisat the interior walls of arteries which results in reducing the size and causing blockage in the carotid artery leading to brain attack or stroke. Twodimensional model of carotid artery is designed and analyzed by Computational Fluid Dynamics (CFD). Designing of general analytical model of artery followed by meshing of geometry, application of boundary conditions and analysis is done with ANSYS Fluent 16.2. The objective of this research is to analyze the consequence of flow velocity and pressure on the arteries having blockage to assess the diseases related to carotid artery. This paper provides analytical analysis of flow velocity and pressure on the artery due to deposition of different shapes of plaque. We consider plaque shape1, plaque shape2, cosine plaque and irregular plaque shapes. Hemodynamic variables like velocity and pressure differ with commute mostly in the shape of geometry. It’s found that velocity is maximal at the constraint as compared to pre- and post-stenotic areas which shows that the artery having more stenosis area has maximum pressure and velocity on the wall of the artery.
Significant complications declining usage of Electrical Discharge Machining process
Authors: Matharou Gurpreet Singh , Bhuyan Basanta Kumar
Published: May 2021

In the present paper, an effort has been laid down to develop a framework for the micro EDM (μ EDM) in today’s industrial environment. The μ EDM has shown considerable involvement in ceramic industries where workpiece needs to be machined in micro sizes. μ-EDM owing to stronger surface quality and higher precision is a futuristic machining process for building up micro tools and alternative micro components. However, there are several complications that demand to be discussed before μ-EDM can be dealt with as a decisive technique and it can carry out its performance. This investigation includes of the EDM system scheduling and electrode wear issues. Particular consideration has been offered to aspects and methods critically varying the efficiency involving positioning approaches during grinding of electrode and new μ-EDM operations.
A Comprehensive review on hydroelectric cell: A green energy source for sustainable development
Authors: Singh R. K. , Manash A. , Kumar S.S. , Satyapal H. K. , Kumar G. , Shankar U.
Published: May 2021

A thorough analysis of the hydroelectric cell, in which electric charges are produced by redox reaction, was attempted. As electrodes, zinc & silver are used, with zinc serving as an anode & silver acting as a cathode. Hydroelectric Cell is a capable, environmentally friendly energy generation system that provides several benefits to humans. HEC is a straightforward, low-cost, & novel technique. The recently developed HEC is proving to be superior alternative to environmentally friendly electrical energy products. For the HEC fabrication, various ferrite nanomaterials such as magnesium, nickel, and others were used. The significance of the recent study is that it focuses on green energy generation, which is an alternative source in today’s energy demand. In addition, hydroelectric cell output is predictable and consistent, and it has the capability to substitute conventional methods of generating renewable energy in terms of cost & security.
Investigating structural, magnetic and multiferroic properties of gadolinium substituted strontium hexaferrite (SrFe12-xGdxO19)
Authors: Kumar Singh S , Singh Rakesh K , Manash Aniket , Kumar Gaurav , Shankar Uday , Satyapal Harendra K
Published: May 2021

An economical and citrate precursor based sol-gel technique is employed for pure phase synthesis of Gd3+ substituted M-type strontium hexaferrite (SrFe12-xGdxO19) for x = (0.25 - 1.00). The XRD patterns reflected all prominent planes related to hexagonal symmetry (P63/mmc space group). The crystallite size and induced strains is determined using Williamson-Hall plot. Lattice constants (a) and (c) shows minor increments with Gd3+ concentration. Particle distributions in SEM micrograph agree with W-H plot analysis. FTIR analysis is in consistent with X-ray intensity results. The ‘Law of Approach’ to saturation is applied to estimate parameters such as, magnetization (Ms) of order 40.91 to 57.7 emu/g and retentivity (Mr) ranging from 26.3 to 32.5 emu/g. A remarkable increase in coercivity (HC) is observed with increasing Gd3+ composition, with a value of 2500 to 6310 Gauss. Moreover, incorporation of Gd3+ in SrFe12-xGdxO19 lattice hinders electrical leakage profitably to yield remanent (Pr) and coercive polarization (Pc) of order 0.19 μC/cm2 and 17 kV/cm respectively. Thus sol-gel method proves to be useful in synthesizing nanomaterials of enhanced physical properties along with it being cost effective. Therefore, we are reporting tuning of magnetic and multiferroic properties of SrFe12O19 due to crystal strain mediated by Gd3+ doping at Fe3+ site.
Development and Performance analysis of Hybrid Based Polymer Composite
Authors: Jha Kamlesh Kumar , singh Harsh , Shukla Manoj Kumar
Published: May 2021

Fiber Supported Polymer Network composites are generally utilized as primary materials. These materials trade ordinary materials for severe reasons. What’s more, these materials are liked for their lightweight and strength. They additionally find widespread application in fuel pipelines and slurry conveying medium in the mechanical application. This exploration tends to the assembling of glass fiber and standard fiber mix composites. Impact of stacking arrangement on malleable, flexural, and sway estimations of untreated woven jute and Glass texture supported polyester half breed composites have been examined tentatively. Overlays were created by hand layup method and followed by restoring at room temperature for 48 h. Separate Jute and Glass fiber overlays were manufactured for correlation reasons. Likewise, these materials are tried for tribological properties like disintegration. Shifting the surface speed, a grouping of slurry and openness time disintegration done. Corrosion-tested examples were oppressed for SEM assessment. SEM micrographs on the FRP showed the misshapen that happened was fundamental because of cutting wear, and the method of disappointment was because of a fragile break. A general examination of the multitude of overlays’ properties uncovered that the incorporation of glass in jute covers bring about an equilibrium in ecological effect and cost.
Computational Fluid Dynamic Study of Blockage in Artery With and Without Bypass
Authors: Ansari Affan Ahmed , Shameem Faisal
Published: May 2021

In complex vessel geometry different temporal, spatial variation takes place which occur under pulsatile conditions. The high Wall Shear Stress (WSS) at the wall affected by the disturbed flow may ultimately lead to endothelial cell dysfunction, which leads to atherogenesis and thrombosis. The present study observes WSS and streamlines due to stenosis with and without By-pass Artery. It was found that by adding bypass Artery there is tremendous decrease in wall shear stress in the stenosis. Reverse flow of blood through stenosis was observed in 30° Bypass Models. Hence the blood flow stabilizes and can be reached at optimum level in 50% stenosed artery. Based on this paper findings, it can be deduced that there would be a low risk of further atherosclerosis when the bypass artery is added.
Design and Development of All-Terrain Vehicle Roll Cage
Authors: Dubey K K , Pathak B , Singh B K , Rathore P , Yadav S R S
Published: May 2021

ATV is an off-roading vehicle and one of its essential parts is its roll cage on which all parts are mounted. The roll cage not only protects the passenger inside the vehicle it also acts as a structural defense for the vehicle. Now because of the above-mentioned properties, the roll cage is required to be structurally robust and it should tolerate high Von mises stresses and should have the least possible deformation during a crash while protecting the motorist inside the vehicle. Hence due to these high concerns of the roll cage, it is necessary to undergo simulation of the design to detect points that are vulnerable to stresses and high deformation. High Impact forces are applied on the roll cage in analysis to achieve real world actions of the chassis, which in fact helped us in developing a design that have mandatory safety standards and adequate potency to withstand these loading.
Optimization of turning process parameters of SS-321 using taguchi based grey relational analysis
Authors: Kumar Gaurav , Wahid Mohd Atif , Tomer Ankit , Kumar Mukesh , Singh Om Prakash
Published: May 2021

Tool wear, high surface roughness & MRR (Material Removal Rate) are the major problems associated with turning of SS-321. The turning parameters such as feed rate, depth of cut and cutting speed have the major effects on surface roughness, MRR, and cutting forces. An increase in magnitude of cutting forces leads to increase in the power requirements and simultaneously it decreases efficiency, which is the great concern in current scenario. In this turning work on SS-321, Taguchi based L27 orthogonal array was designed and experiments were performed accordingly. The data analysis was done by Taguchi, ANOVA and Grey relational analysis. The optimized results and improvements by using this method were also validated by a verification test. Results revealed that turning process with parameters such that feed rate, depth of cut and cutting speed at 0.3 mm/rev, 0.3 mm and 120 m/min respectively yields the optimum multi-performance characteristics. However, it was determined by ANOVA (Analysis of Variances) that depth of cut is a process parameter that affect most the multi-function features with percentage contribution of 64.86% followed by feed (16.84%) and speed (10.20%). Under these circumstances, the optimum parameters set seems to favorably affect the average values of all the three response parameters (surface roughness, cutting forces, MRR) so that the average values of output characteristics arrive at optimum level.
Assessment of appropriate areas for the establishment of Solar Thermal Power Plant in Rajasthan
Authors: Agarwal Sajal , Gautam Harshit Kumar , Tarique Altaf Hasan
Published: May 2021

In past years, cost of photovoltaic has decreased and investments of solar power plant have increased. In spite of this, practical studies remain paramount as cost of installation is comparatively high. One of pivotal parameters in studies is the proper location selection. So, in this paper we mix Analytical hierarchy process (AHP) and multi-criteria decision making method (MCDM) to get the results of the ideal position of sunlight based energy station in Jodhpur, Rajasthan. Using MCDM the models or factors referenced will be weighted to assess possible destinations to find a sunlight based plant. Examination and count of the loads of these variables will be directed utilizing AHP. For this study Sardarpura, Kabir Nagar and Mandore are selected as examples. These places are located in same plane. The decision of such measures is set apart by the impact introduced to the general objective; for this situation in climatic models and geomorphological. In study, it is found that Kabir Nagar is ideal position for establishment of solar power plant. This result is based on criteria, feeder capacities, solar energy potential and earth slopes. The result are ratified by considering the total amount of area and sunshine duration.
Application of taguchi method coupled with GRA for optimization of drilling process parameters
Authors: Sharma Khushboo , Kumar Gaurav , Kumar Mukesh
Published: May 2021

In present article, an experimental study is performed for optimizing the machining parameters of AA6082. The control factors like cutting fluid (present - absent), speed (520 rpm – 420 rpm), feed rate (120 mm/min – 80 mm/min) and hole-depth (16 mm – 24 mm) are taken into account to optimize the material removal rate and surface roughness. Taguchi’s L18 orthogonal array was chosen for experimental trials. Grey relational analysis is employed to find, which process parameters affect the surface finish most with their percentage contribution individually. The results of ANOVA show that among all the control factors, feed rate (74.82%) is the highest contributing factor followed by cutting fluid (11.42%). This study also shows that by using the taguchi approach, the surface finish of the machining process can be upgraded.
Application of Generalized Models for Identification of Viscoelastic Behaviour on Hysteretic Double Peak Materials
Authors: Carputo F , Arricale V M , Brancati R , Maiorano A , Mosconi L
Published: May 2021

This paper investigates the capability of the fraction derivative Maxwell model to reproduce the mechanical behaviour of advanced viscoelastic materials, that are designed to be able to dissipate energy in an extended range of frequency than traditional viscoelastic materials and present a more complex shape of strain-stress frequency response. Fraction derivative models, compared to traditionally used generalized Maxwell model, can reproduce the material behaviour with a smaller number of parameters, reducing the utilization complexity and the computational burden.
Laccase nanoparticle: Synthesis, characterization, entrapment in alginate beads and application in the biodegradation of Bisphenol A
Authors: Ademakinwa Adedeji N , Ojo Abidemi , Erasmus Mariana , Agunbiade Mayowa O.
Published: May 2021

Laccase nanoparticles (LNP) were synthesized by desolvation of the enzyme with ethanol and cross-linking with glutaraldehyde. LNP was characterized via scanning electron microscopy (SEM) and then entrapped in alginate beads for the biodegradation of bisphenol A (BPA). The stability of the immobilized LNP (iLNP) to heat inactivation was also investigated. The iLNP retained about 53±4.7% of its initial activity after 7 cycles of catalysis. The iLNP was stable to thermal inactivation at 40-70°C as obtained from its kinetic and thermodynamic parameters. The iLNP removed 80 mg/L BPA from solutions with a biodegradation efficiency (BE) of 92% after 1 h. Repeated use of the iLNP in BPA removal resulted in a BE of 75% after 7 cycles of catalysis. iLNP serves as a novel biocatalyst in the bioremediation of pollutants such as BPA, and its thermostable characteristics make it useful for other biotechnological applications
Biomimetic approaches to color formation in ecological architecture
Authors: Krivenko O , Pylypchuk O , Avdieieva N , Avdieieva M , Bieber S
Published: May 2021

The article discusses the characteristics and features of the color formation in nature for solving problems of ecological architecture. The analysis of the main directions of research on the significance and possibilities of color solutions in creating an ecologically sustainable urban environment is presented. It is proposed to use analogs of nature to obtain natural features and qualities of ecological design of buildings, including in the formation of the color structural component of the design. As a result of the analysis of the studies, the mechanisms of color formation in nature, based on functional expediency, adaptation to the conditions of life in the environment, have been identified. The mechanism of formation of pigment, structural and combined colors in nature is considered. On the basis of the presented analysis of the functionality of color formation in nature, coloristic means of regulating the energy-efficient and environmental parameters of the building, namely thermoregulation, regulation of illumination, humidity, are identified. The examples of color solutions of building finishing aimed at adaptation to external environmental conditions are analyzed. The methods and possibilities of forming the color structure on the basis of the studied natural analogues for solving the problems of modern ecological architecture are systematized.
Study on the water vapor adsorption Characteristics of Carbon materials in HTGR
Authors: KaiYue Shen , Da Yan , HuaQiang Yin , XueDong He , Tao Ma , hua Fan
Published: May 2021

High-temperature gas-cooled reactor (HTGR) is the first kind of power plant with fourth-generation features in the world, and a large amount of graphite and carbon material is adopted as structural material and fuel matrix material, including boron-containing carbon (BC) and isostatic pressure graphite (IG-110). As a kind of porous material, the carbon material contains a certain amount of moisture, which will impose negative effects on reactor safety. Therefore, this paper studies the water vapor adsorption characteristics of carbon materials in HTGR. The adsorption isotherms of BC and IG-110 were obtained by experimental measurements. Experiments show that the moisture adsorption of IG-110 is much lower than that of BC at various relative humidity. The experimental data is analysed by the BET, GAB, DA, Oswin adsorption models.
Influence of the activating solution on the mechanical properties of compacted volcanic ash based geopolymers
Authors: Churata Rossibel , Almirón Jonathan , Roudet Francine , Bautista Asunción , Torres-Carrasco Manuel , Tupayachy-Quispe Danny
Published: May 2021

This work studies the mechanical properties of volcanic ash based geopolymer mortars. The geopolymer mortars were made with volcanic ashes from Ubinas volcano using mixtures of Na2SiO3 and 12 M NaOH as alkaline activator. Solutions with different concentrations of silicate (0-25 % by wt.) were used. The geopolymer mortars were compacted at 15 MPa and cured at 80°C for three different periods of time. The results show the influence of the concentration of Na2SiO3 in the compression strength and wear resistance, raising highest compression strengths for 20-25% of Na2SiO3 while the wear resistance was higher at concentrations over 20% of Na2SiO3. In this optimal ratio, for 20% Na2SiO3, a compression strength up to 52.3 MPa was recorded at 7 days. Considering the overall performance analysis, the synthesis of geopolymers with volcanic ash promises a solution for sustainable mortar production and natural waste disposal.
Catalytic pyrolysis of plastic materials using natural zeolite catalysts synthesized from volcanic ash
Authors: Vargas María , Tupayachy-Quispe Danny , Roudet Francine , Duquesne Sophie , Almirón Jonathan
Published: May 2021

Plastic waste and its inadequate final disposal are a serious problem of environmental pollution, which has increased considerably in this time of pandemic due to the use of masks, gloves, food packaging or others, which will eventually reach the oceans, increasing the problem of the islands that are made up of plastic waste. Since the final disposal techniques of plastic waste are insufficient, in this research the catalytic pyrolysis has been evaluated using zeolites synthesized from volcanic ash of the Ubinas volcano (Peru), as catalysts. For this, two catalysts were synthesized, Z1 and Z2 zeolite, made at 150 and 180 °C in a 5 M NaOH solution, respectively. The pyrolysis was carried out at a catalyst/polymer ratio of 10 and 20 % and it was compared with a synthetic zeolite (ZSM-5) and without catalyst at a reaction temperature of 450 °C. The essays were carried out with PP virgin and plastic waste. It was determined that catalytic pyrolysis using natural zeolites synthesized from volcanic ash are appropriate for the treatment of plastic materials and that they tend to generate a higher proportion of pyrolytic gases and do not generate carbonaceous residues.
Numerical Analysis of Initially Imperfect Pretensioned Bolted Connections
Authors: Abdallah Mostafa Nour Eldin M. , Salem Emad , Ibrahim Sherif M. , Dessouki Abdelrahim K.
Published: May 2021

Bolted steel end-plate rigid connections are used to transfer straining actions between different parts of steel structures. However, during structural assembly some of these connections are erected with initial imperfections in form of gap between connected parts. This paper investigates numerically initially imperfect end plate connections subjected to major external bending moment and major shearing force. A finite element model (FEM) is developed to represent the behavior of these initially imperfect connections. The presented FEM is verified against experimental testing presented by the authors in previous work. The effect of the gap angle between connected parts on the connection bending strength and moment-curvature relationship is investigated by varying its value from 1.5° to 6°. The results of initially imperfect connections are compared to those of perfect ones and it is concluded that the loss in bending strength of imperfect connections varies from 11.5 % to 22 % for gap angles from 1.5° to 6° respectively.
Study of the physical-mechanical properties of igneous stones from Tlalpujahua Michoacan, Mexico
Authors: Alonso-Guzman Elia Mercedes , Navarrete-Seras Marco Antonio , Martinez-Molina Wilfrido , Chavez-Garcia Hugo Luis , Lara-Gomez Cindy , Garcia-Perdomo José Carmen
Published: May 2021

Research work was carried out on rocks obtained in the municipality of Tlalpujahua Michoacán, located in different quarries of stone material, classifying the name of the quarry with the name of the community where the stones are located: “El moral” stones of bronze (BR) and golden (D) color, “la américa” stones of gray (G) and pink (R) color, “llano grande” stones of dark brown (CO), reddish-brown (CR) and black (N) color. Physical and mechanical tests were carried out, evaluating the percentage of moisture absorption, density, and absolute density. To evaluate the mechanical properties, the following tests were performed: uniaxial compressive strength (UCS), and static flexural test (modulus of rupture). The comparison of the different physical-mechanical tests allows estimating their behavior as a structural and restoration element. The correlation obtained to estimate the UCS has an acceptable correlation coefficient.
Verification of Finite Element Computational Model for Biaxial Buckling of Stiffened Plates
Authors: Baumgardt Guilherme Ribeiro , Silveira Thiago da , Lima João Paulo , Rocha Luiz Alberto Oliveira , Santos Elizaldo Domingues dos , Isoldi Liércio André
Published: May 2021

This study presents the verification of computational models for the analysis of biaxial buckling in plates. The verification was performed by comparing the numerical results obtained in this study with results found in scientific references published by other authors. The computational models were developed in the ANSYS® software, which is based on the Finite Element Method (FEM), and the SHELL 281 element is used. The mesh convergence tests demonstrate the convergent behavior of the simulations performed for the analyzed examples, which are: a square plate under biaxial elastic buckling, and a rectangular plate with stiffeners under biaxial elasto-plastic buckling. From the converged mesh, maximum differences of 0.84% and 3.89% were achieved when compared with references, respectively, for the elastic and elasto-plastic biaxial buckling. These results indicate that the proposed computational models were adequately verified.
Effect of uniform corrosion on mechanical behavior of E690 high-strength steel lattice corrugated panel in marine environment: a finite element analysis
Authors: Liu Ming
Published: May 2021

The quasi-static compression, three-point bending and low-speed impact behavior of E690 high-strength steel lattice corrugated sandwich panels after corrosion in a marine environment were simulated by a non-linear finite element method. The uniform corrosion model was used to calculate the effects of different levels and duration of corrosion on the bearing capacity and energy absorption of an E690 panel. The results show that the corrosion of the outer panel has the least influence on the decrease of the mechanical properties; the structure’s mechanical properties are greatly reduced by the inner panel and core corrosion, and a new deformation pattern could be observed. Considering the influence of corrosion duration, the mechanical performance ranges from bad to good: outer+inner > inner > outer. Furthermore, the difference becomes more obvious with longer corrosion times, indicating that necessary corrosion protection measures should be taken to protect the panel from corrosion in marine environment, especially for the internal part of the panel.
Peoples, Principles, and Finality
Authors: Barber N W
Published: May 2021

The Principles of Constitutionalism examines the principles which speak to the construction and interaction of state institutions. This article responds to some criticisms of that book, in particular, those which question the universalizability of the principles, the relationship between state institutions and the people of the state, the place of democracy within constitutionalism, and the role of finality in state decision-making. It is argued that it is the link between the people and institutions, mediated by democracy, that both explains and justifies the state’s claim to act as the final arbiter of the obligations of its people.
A commentary on: ‘Divergence in floral scent and morphology, but not thermogenic traits, associated with pollinator shift in two brood-site-mimickingTyphonium(Araceae) species’
Authors: Rands Sean A
Published: May 2021

This article comments on:

Thomas D. J. Sayers, Kim L. Johnson, Martin J. Steinbauer, Kevin Farnier and Rebecca E. Miller and Divergence in floral scent and morphology, but not thermogenic traits, associated with pollinator shift in two brood-site-mimicking Typhonium (Araceae) species, Annals of Botany, Volume 128, Issue 3, 26 August 2021, Pages 261–260, https://doi.org/10.1093/aob/mcab044