bluuebunny/crossref_metadata_2025 huggingface dataset:
Provisioning of Contention Resolution in Multiple UAVs to Establish Collaborative Tasks
Authors: Saravanan M , Baskaran Sandhya
Published: March 2021

As demand for commercial roles for Unmanned Aerial Vehicles (UAVs)is at its peak, market players are finding it more difficult to accommodate the ever-changing dynamic market requirement. As UAVs are used across multiple verticals such as photography, delivery, providing medical assistance, tracking, etc., the demand has pushed open the floodgates for this sector. UAV platforms today offer only the idea of leasing a drone for a specific period which works well if the requirements are known prior. In the case of an agile environment, the platform services need to incorporate the policy of leasing and releasing UAVs on a need basis. Our paper focuses on the idea of a dynamic UAV as a service platform wherein the UAVs are hired from the public using some selection and provisioning methods. Such a solution will assist in the fast-paced and cost-effective development, but also enable interoperability between multiple companies to share the resources. Regarding this, we have introduced a new contention resolution framework to handle multiple UAVs during the collaborative operation. The proposed framework which comprises a new protocol, task filter, and the application of the Machine Learning (ML) model to perform probabilistic ranking and assign the UAVs for the specific tasks that will address the required situation efficiently.
Robotic arm for automatic brake testing and control
Authors: Krishnapuram Seetharam , Kameswara Rao Adithya , Dhivakar K M , Kapur Mayank
Published: March 2021

Brake testing is an important verification test before putting an automobile up for sale. Unfortunately, brake judders which act as hindrance for getting true brake performance results can’t be rectified. Therefore, we have to account for brake judders in our brake test results. Our project is aimed at reducing the effects of brake judder by examining the Disc Thickness Variation dynamically with the heat produced because of friction between brake pads and disc as the brake is applied. This thorough examination is done with the help of a capacitive sensor which continuously feeds disc thickness variation data to our robotic arm which is programmed to change the position of the brake pedal in order to keep a uniform brake force on the disc.
Benchmark Device To Mitigate Jaw Tremor Using Gyroscopic Effect
Authors: Harikrishna K , Dhivakar K M , Puthiyavan L N , Meenatchi L S , Rajiv Navneeth , Premkumar S , Girithar T A
Published: March 2021

A tremor is a mildly rhythmic muscle contraction and relaxation that predominantly involves involuntary oscillations or twitching movements of one’s body parts. Jaw tremor looks more like shivering although with different amplitude and frequency which can vary. Jaw tremors hinder patients’ day to day activities and hamper confidence, causing social handicaps. There are only drug-based solutions for jaw tremors to date. Currently, there are some surgical treatments like Deep Brain Stimulation (DBS), but, they have side effects. Our solution - the palliator a wearable, ergonomic device that dampens jaw tremors without producing any side effects on patients. The proposed solution uses two accelerometers to detect and distinguish involuntary tremors from the voluntary jaw motion and then uses the gyroscopic principle to control the involuntary motion, thus resisting the tremors.
5-Position 4-Actuator Automated Bed To Prevent Bed Sores
Authors: Premkumar S , Girithar T A , Niranjan Kumar P , Saimothish R , Ashok Malani Vaibhav , Jacob Rubin
Published: March 2021

Bedsores — also called pressure ulcers or decubitus ulcers — are injuries to the skin and underlying tissue resulting from prolonged pressure on the skin. For permanently bedridden patients (especially those paralyzed or in coma), bedsores are a problem which is usually either ignored or not dealt with properly. The effects of bedsores can be very severe when it reaches higher stages (stage 3, stage 4) below the surface of the skin, even exposing the bones. The causes of bedsores are pressure, shear and friction where pressure plays a significant role and hence are known as pressure ulcers. When a person lies on a bed for a prolonged period of time, the pressure at body parts such as the tailbone, shoulder blades, heels, ankle, skin behind knees restricts blood flow at these points which in turn results in sores. Taking care of patients affected by bedsores is a trying process for the nurses or the caretaker. Either by distributing the pressure throughout the body or by shifting the pressure points frequently, the occurrence of bedsores can be delayed or prevented. Hypnos employs the latter principle to prevent the development of bedsores by attaining five different positions.
A Trade-off between ML and DL Techniques in Natural Language Processing
Authors: Singh Bhavesh , Desai Rahil , Ashar Himanshu , Tank Parth , Katre Neha
Published: March 2021

The domain of Natural Language Processing covers various tasks, such as classification, text generation, and language model. The data processed using word embeddings, or vectorizers, is then trained using Machine Learning and Deep Learning algorithms. In order to observe the tradeoff between both these types of algorithms, with respect to data available, accuracy obtained and other factors, a binary classification is undertaken to distinguish between insincere and regular questions on Quora. A dataset called Quora Insincere Questions Classification was used to train various machine learning and deep learning models. A Bidirectional-Long Short Term Network (LSTM) was trained, with the text processed using Global Vectors for Word Representation (GloVe). Machine Learning algorithms such as Extreme Gradient Boosting classifier, Gaussian Naive Bayes, and Support Vector Classifier (SVC), by using the TF-IDF vectorizer to process the text. This paper also presents an evaluation of the above algorithms on the basis of precision, recall, f1 score metrics.
A review on the characteristic of biomass and classification of bioenergy through direct combustion and gasification as an alternative power supply
Authors: Sivabalan K , Hassan Suhaimi , Ya Hamdan , Pasupuleti Jagadeesh
Published: March 2021

Extinction of fossil fuel resources owing to excessive use has called up new solution-based resources called ‘biomass’ which is more affordable to deliver and utilize, bring less environmental damages such as greenhouse gas (GHG) emission, opened more employment opportunities in both rural or suburban areas due to the abundant availability of this resources throughout the world. About 44% of the energy required by the year 2030 and about 14% energy sourced from biomass in 2016 based on the World Bioenergy Association’s data. Biomass can be sorted from various sources such as municipal solid waste (MSW), agricultural crops, crop residues, and forest residues. The clear cut of biomass characteristics in proximate analysis and ultimate analysis makes it possible to produce reliable energy resources. Biomass is multi-faceted fuel; thereof, it produces biofuel, which can be used in transportation and bioenergy to generate cleaner and affordable electricity throughout the world. In that sense, in this article, the characteristics and functionality of different thermochemical processes such as direct combustion and gasification have been discussed, and the reliability and new findings in various aspects in the bioenergy field. Furthermore, the advantages and disadvantages have been discussed to substantiate further the core objective of renewable energy in producing better, cheaper, and harmless to the surrounding environment. This study will give a brief understanding of the right way of using biomass and indirectly reduce the usage of fossil fuel, thus reserving a better world for the future generation.
A Metrological of Laser Pavement 3D Measurement Equipment
Authors: Liu Yue , Zhou Yishu , Zhang Jinning , Ren Lishuo , Cao Jinjin
Published: March 2021

Laser pavement 3D measurement equipment is widely used in pavement measurement due to its comprehensive, fast and reliable measurements. In the study, based on the working principle and measurement output indicators of laser pavement3D measurement equipment and the analysis of influencing factors, reasonable metrological indicators were determined firstly. Then, a convenient, efficient, and reliable test method was developed based on the determined metrological indicators to provide the basis for calibrating objects and preparing metrological standards. In addition, through the survey from partial users in China, the measurement errors of existing equipment were evaluated. The study provides the basis for subsequent establishment of metrological standards for pavement 3D measurement equipment.
Analysis and Application of Judicial Data Based on Machine Learning
Authors: Yang Juan
Published: March 2021

At this stage, judicial trial work has received increasing attention from the people and society, and its rationality is regarded as one of the important evaluation criteria for the fairness and effectiveness of the national judicial organs. This article analyzes the methods and types of machine learning. The author studies the relevant content of the machine learning judicial data process. The purpose of this article is to improve the reliability of the analysis and forecast results and provide a theoretical basis for the further improvement of the national legal system.
Research on the Fast Reset Time of Safety Rod and Implementation
Authors: Wang Shijia , Wang Zhenlin , Li Yuan , Gao Jiaqi , Feng Jun
Published: March 2021

The fast reset time of the safety rod is one of the important parameters for the drive design of space nuclear reactor. In the paper, it analyses the structure, operation process, and fast reset process of the safety rod system, and proposes a measuring method that measures the change of the angular displacement sensor in the drive mechanism during the fast reset process of the safety rod assembly to get the fast reset time of the safety rod. The ground engineering prototype of the safety rod was used to verify the measuring method, by real test environments, such as real high temperature, earthquake. The test results show that the measuring method of the fast reset time is effective on the safety rod, and provides a test basis for the research on the drive design of the safety rod system of the space nuclear reactor.
Power grid automatic dispatching method considering renewable energy fluctuation
Authors: Li Huixiu
Published: March 2021

In the process of power supply, the abnormal fluctuation of renewable energy leads to the increase of economic cost of power grid dispatching. Therefore, this paper proposes a power grid automatic dispatching method considering the fluctuation of renewable energy. According to the fluctuation of renewable energy, the power of renewable energy is predicted, and the power balance is judged by combining with other power related parameters in power grid operation. According to the change of peak load regulation, the power grid control center issues dispatching instructions and adjusts power related parameters to achieve the purpose of power automatic dispatching. The experimental results show that the proposed power grid automatic dispatching method considering renewable energy fluctuation has small operation delay and low economic cost, the economic benefit of which is higher than that of the traditional dispatching method.
Design of reducer cooling system based on PLC control
Authors: Huaifeng Cui , Yaxian Zhang , Yuanchang Lin , Guotian He , Guangping Chen
Published: March 2021

Combining PLC and configuration software to design the reducer cooling system, can realize the functions of reducer temperature monitoring, lubricating oil cooling, and replacement; the article puts forward the design scheme of the reducer cooling system, summarizes the various functions of the control system, analyzes and describes the realization method and key technology of the control system in detail.
Nonlinear Vibration of Manipulator Induced by Coupling Time Delay and Control Strategy
Authors: Deng Zhiju , Jiang Shanying
Published: March 2021

This article uses the theory of Hopf bifurcation to study the stability[1-2] of nonlinear manipulator system with time delay built by Spong. The period vibration, almost periodic vibration and chaos motion are stabilized by the controllers designed in the article, which is achieved by changed the polynomial u in the dynamic of manipulator. It is proved that the controllers in this article are useful by calculating the eigenvalues of the linear form of the dynamic of manipulator, which are expressed in the complex plane, according to the stability theory[2].
Detection of Power Data Tampering Attack based on Gradient Boosting Decision Tree
Authors: Ping Guo
Published: March 2021

In order to improve the detection accuracy of the data tampering attack of the Power Cyber-physical System, a method of Power CPS attack detection based on Gradient Boosting Decision Tree is proposed in this paper from the angle of artificial intelligence. Firstly, by setting up the iForest anomaly value equation of physical system and IDS Shannon entropy function of information system, the feature extraction of data tamper detection is realized. Then, the CART decision tree is taken as the base learner of the detection classification, the target is minimized by the loss function, and the high intensity attack detection model is designed by iterative combination. Finally, the three-dimensional adaptive chaotic FOA algorithm is proposed for dynamic optimization of model parameters, an attack detection model under training optimal parameters. The analysis of the example shows that show that the proposed method can effectively detect power CPS data tampering attacks and has excellent detection precision.
Summary of Natural Language Generated SQL Statements
Authors: Yang Sen , Liu Yang
Published: March 2021

The entry cost of database query SQL statement is high, which is difficult for most database users. Therefore, natural language automatic generation of SQL sentences has gradually become the leading research direction in recent years. Previous researchers have done much excellent work in this area. This article mainly summarizes generating SQL statements in common natural language at present and conducts a detailed analysis. We summarize the current problems faced by SQL statements’ natural language generation and look forward to future development trends.
Intelligent Magnetic Experiment Teaching System Based on Hall Effect
Authors: Xu Fuxin , Wang Su , Yu Huiming
Published: March 2021

The Hall effect experiment occupies an important position in the teaching of university physics experiments. Traditional experimental teaching instruments have problems of tedious operation and difficult data collation. The new system designed in this paper uses the STM32 series single-chip microcomputer, the main control chip VT95276L128 and the touch screen module, and adopts the configuration graphic user design software VGUS programming to intelligentize the traditional TH-H / S type Hall effect experimental instrument. In addition to retaining all the functions of the original instrument, the experimental data processing and drawing can be handed over to a single-chip computer, which improves teaching efficiency and facilitates students to think deeply about the experiment.
Detection of the Inductive Magnetic Field of Submarine with Upper Arc Sensor Array based on Integral Equation Method
Authors: Ouyang Jianfeng , Zhao Wenchun , Liu Shengdao , Wen Haodong
Published: March 2021

In order to effectively solve the problem of the accuracy of the magnetic field measurement of submarine upper vault sensor, an integral equation method based on the magnetic field detection method of submarine upper vault was proposed. By analyzing the simulation data of the dome magnetic sensor, the analysis solution and the integral equation solution of the ellipsoid shell of the ship model are compared, so as to verify the accuracy of the integral equation method and provide a reference for the magnetic field measurement accuracy of the submarine upper part.
Fault dynamic monitoring of intelligent power system telecontrol dispatching based on improved fault tree
Authors: Qian Jianguo , Zhu Bingquan , Li Ying , Shi Zhengchai
Published: March 2021

The number of transmission messages is small when the traditional power system monitoring methods collect signals, Therefore, a fault dynamic monitoring method of intelligent power system telecontrol dispatching based on improved fault tree is proposed. The telecontrol communication model of intelligent power system is constructed. The communication signal of telecontrol dispatching channel is collected. The parameter of signal time-domain characteristic is measured. The time-domain waveform can pass through the zero period to get the carrier frequency range, judge whether the system telecontrol dispatching has fault, and analyze the fault mode by improving the graphical logic deduction of fault tree. A comparative experiment is carried out. Compared with the traditional methods, the results show that the design method can improve the number of packet transmission per unit time, increase the network traffic, and ensure that the communication network has very low load in the dynamic monitoring process.
Dual-Loop Iterative Learning Control of Robot Manipulator for Human-Robot cooperation
Authors: Lai Jianyong , Jin Shuping , Xia Peng , Huang Jie , Yuan Peng
Published: March 2021

This paper proposed a dual-loop iterative learning control strategy for robot manipulator in the situation of repetitive human-robot interaction. By utilizing the contact force between the human and the manipulator, a force-based loop is first conducted to produce the unknown desired trajectory of the manipulator. According to Lyapunov’s method and using the back-stepping technique, an adaptive iterative learning controller is presented to fulfill the trajectory tracking task of the robot manipulator, in spite of the model uncertainties and the unknown disturbances. The proposed control scheme is verified by numerical simulation on a robot manipulator with two degrees-of-freedom.
Retraction: Improvement of hydraulic accounting of water resources in irrigation systems using geoinformation systems (IOP Conf. Ser.: Mater. Sci. Eng.
1030 012117)
Authors: Qosimov Jakhongir , Nasritdinova Umida , Nasritdinov Axmadjon
Published: March 2021

IOP Publishing are retracting this article following an investigation of translated plagiarism. IOP Publishing consider this paper a translation of [1], which was done without the knowledge or consent of the original author. IOP Publishing Limited request any citations to this article be redirected to the original work [1].

[1] Shamshodbek B Akmalov 2018 Improvement of Hydraulic Calculation of Water Recourses in Irrigation Systems with Using GIS Thesis 2018 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers (http://library.ziyonet.uz/static/lib/reader-pdf/web/viewer.html?file=http://library.ziyonet.uz/uploads/books/251467/5b430b514db6a.pdf)

Retraction published: 17 March 2021
Analysis of the developed hinged joint assembly of the wheeled harvester
Authors: Klubnichkin V E , Klubnichkin E E , Kartashov A B , Vasilyeva K V
Published: March 2021

This work presents a kinematic analysis of the hinged joint assembly of the wheeled harvester which consists in determining limit folding angles of the joint assembly and travel of the hydraulic actuators against the developed electronic solid models. A resisting moment required for a vehicle spot folding on a hard bearing surface with a high friction factor with due consideration for the tires’ interaction with the bearing surface has been found with use of the Pacejka semi-empirical model MF-Tyre 6.1. Parameters are for tire model 710/45-26.5. The harvester dynamic model has been created having the following features: all links of the dynamic system are absolutely rigid; all wheels are free and rotating; no friction in hinges; Modelling was carried out for fully loaded harvester; rear tandem axle is rigidly coupled through a drive shaft with the front tandem axle; axle differentials are not blocked. Presented are vertical loads in the front and rear axle wheels’ patch area as well as lateral responses in the front and rear axle wheels’ patch area.
Comparative study of impression and cutting into ice by helical blade
Authors: Vakhidov U Sh , Yerasov I A , Molev Y I , Mokerov D S
Published: March 2021

The paper presents the results of energy efficiency studies of helical blade penetration types into ice. There are two principally different ways of helical groove generation in ice – by cutting and impression. It was found out that at a longer duration of the penetration process of the helical blade with a smaller lead angle the energy demand of the propulsion gets lower due to impression. At blade penetration by cutting, there is an extremum at the angle of cutting of 40-450, however, the energy demand in such condition is still higher than that of the penetration by impression. Considerable attention is paid in the paper to the measurement of the noise generation during the interaction with the penetrated surface which allows for prompt assessment of the energy efficiency of the considered parameter. The obtained results allow for efficiency improvement of the operation of vehicles with rotary screw propulsion units in real environments, as well as for their increased reliability due to new diagnostics methods.
Predicting modeling of the service properties of carrying systems in the articulated-vehicle-based self-propelled artillery systems
Authors: Bazhenov E E , Kustovsky A N , Usupov M L
Published: March 2021

The work is devoted to the possibility and prospects of the use of articulated-vehicle-based self-propelled artillery systems in order to increase their effective firing rate abilities. The reasons for creating such systems are presented. A mathematical model and its description are given. The high convergence of the analytical and the experimental data shows the adequacy of the established mathematical model. The use of the articulated-vehicle construction in self-propelled artillery systems makes it possible to reduce the time between two shots by about 2.5 seconds. Work conditions of the crew are also substantially improved.
Simulation of the passive part of an active car muffler
Authors: Okunev A , Kocherov A , Mantserov S , Kolobov M , Bushmanov D
Published: March 2021

Active noise reduction is a new method for solving acoustic noise problems. Acoustic and thermal measurements of the passive system were performed to determine the design requirements for the future active system for the internal engine. Further, the study of this system by the finite element method was carried out. The article presents the results of measurements and analysis of the system during modelling.
Potential of Latent Heat Load Removal by Activated Carbons for Energy Savings of Air Conditioning Systems
Authors: Miyazaki T , Chairunnisa  , Miksik F. , Thu K , Miyawaki J , Nakabayashi K , Wijayanta A T , Rahmawati F , Kristiawan B , Yaningsih I
Published: March 2021

The study aims to achieve energy savings of air conditioning systems using desiccant dehumidification with low-cost adsorbent. For this purpose, two existing activated carbons were evaluated in terms of water adsorption capacity. The theoretical calculation of effective adsorption from the water adsorption isotherms revealed that the studied activated carbons have promising potential in dehumidification application. In addition to that, the improvement of cooling COP of air conditioners was predicted by simulation of heat pump cycle. The results showed that the COP improved by 50%, which was equivalent to the reduction of electricity input by 30%, with the raise of evaporation temperature from 8.5°C to 18.5°C. The results encouraged the separation of dehumidification load from air conditioners to achieve large energy savings.
A Framework of Integrated Sustainable Make or Buy Decision Model
Authors: Rosyidi C N
Published: March 2021

Tolerance has been recognized as the connector between engineering design and manufacturing stages. It plays an important role in both stages and must be optimally determined to minimize several objectives such as manufacturing cost and quality loss. Considering the engineering design, the tolerance should be set tightly in order to get better quality. Conversely, considering manufacturing stage, the tolerance should be set loosely in order to make the manufacturing process less costly. Process and technological capabilities as well as limited production capacities made manufacturing companies to outsource some of their needed components to their suppliers. Hence, the manufacturing companies should decide which components have to make using its own production facilities and which one that must be purchased from the suppliers. These decisions can be made simultaneously with the determination of optimal tolerance. Due to the intense concerns on environment, sustainability gained more attention in recent years and attracted many researchers including in the field of make or buy decisions. We attempt to integrate the make or buy decisions with sustainability in the form of remanufacturing to determine the optimal component tolerance. We found that the Bass model, a widely used model to predict new product demand, can be integrated to make or buy decisions model specifically in determining the expected number of returned product to be remanufactured. We identify some problems in the integration such as the lead time which comes from the product useful life and time to collect the return product and also the representation of remanufacturing cost function in its relation with tolerance assignment, and considerations of single or multi manufacturing generations.
Feasibility Study of Web-Based POS System Implementation for SMEs in Bangladesh
Authors: Sourav A I , Emanuel A W R
Published: March 2021

As a developing country, Bangladesh is still less advanced in using the latest technologies such as websites, e-commerce, high-speed internet, point of sales (POS), etc. which is a great barrier in SME development. Proper implementation of technologies can achieve the full potential of this valuable sector. This paper aims to find out the feasibility factors of the implementation of a web-based point of sales system for SMEs in Bangladesh. The implementation of such kinds of systems will help SME entrepreneurs to achieve more potential from their businesses. A comparison of ICT developments, technologies, and POS system adaptation scenarios between Indonesia and Bangladesh is presented based on secondary data sources. The study indicates the current challenges to implement new technologies in SME sectors. The research found out the recent technological development conditions in Bangladesh. The results indicated that the implementation of a web-based POS system is feasible for SMEs in Bangladesh if the challenges can be successfully overcome. The authors suggest priority steps be taken by the government and private agencies for POS system adaptation by the SMEs in Bangladesh.
Six Sigma Implementation in Production Process in Electronic Company Malaysia
Authors: Utami M W D , Ma’aram A , Hisjam M
Published: March 2021

The electronics industry is one of the growing industrial sectors because of the need for electronics industry products continuously increases. This situation of development is driving the fast pace of electronics industry companies in Malaysia to be better prepared to face competition in the era of free trade. The study was carried in an electronic company in Malaysia that produce hard disk components. In this company, the number of defective products is very high which is the average defect (they call it u-loss) in the brushing room for arm body actuator products reaches 0.454% and one type of actuator arm body has reached 0.982% of defect units which means the company loses 65,000.88 RM per year. This study only focused on actuator arm body production in brushing room and aim to determine the dominant product which have the biggest percentage of defect, determine types of defects in the production of selected product, determine the root cause of the biggest defects in the production of selected product in brushing area, and recommend improvements in order to minimize the occurrence of defects in the production of selected product. This research uses Six Sigma in solving problems in the company. This study did not evaluate the results of the Six Sigma implementation directly. Therefore, as an alternative, quality improvement is done through Monte Carlo simulation with several scenarios. If zero defect in actuator arm body production is reached, company can save 65,000.88 RM per year.
Network Characterization of Goods Movement in Indonesia
Authors: Sopha B M , Setiawan A
Published: March 2021

Network characterization of goods movement is particularly important to estimate needs and accurate management for freight transportation. The present study aims at characterizing the network of goods movement in Indonesia and examining the effectiveness of network characterization for prediction purpose. A network approach using RStudio was applied. It was found that the network of goods movement in Indonesia is characterized by weak inter-provincial goods movement, scale-free network, disassortative, having rich-club phenomenon, and having a core-periphery structure in which Sumatera Barat (West Sumatera) and Jawa Barat (West Java) appears to be the cores of the network. The findings also demonstrate that the prediction model developed by characterization performs better and can explain, on average, 39% of the variances. The prediction models for chemicals, fuel, meat and livestock, fish, crude oil, and fertilizer, have even better capability to explain variances in the volumes of goods movement by more than 60%. Potential avenues for future research are also discussed.
Production Machine Maintenance System Design Using Reliability Centered Maintenance
Authors: Wicaksono P A , Saptadi S , Nurkertamanda D , Rozaq R
Published: March 2021

One of the indicators in increasing productivity is the level of reliability of production machines. The reliability level of a production machine is determined by the effective and efficient maintenance process of the company. A case study was conducted in a manufacturing company. In the period January until June 2019, the percentage of machine downtime is more than 3.0% (ideal benchmarking downtime for the manufacturing industry). Research carried out using Reliability Centered Maintenance (RCM). It starts with determining critical objects, then identifies each function of the assets, carries out FMEA analysis and calculates the highest risk of each failure mode, calculates proper maintenance intervals for the five highest failure modes, then ends with making a maintenance strategy by considering risk based inspection. This study aims to develop a maintenance strategy model that is better than what is currently used. By applying Reliability Centered Maintenance, machine reliability can be increased by an average increase of 39.34% and the right maintenance strategy can be found. Furthermore, it will get a new framework to become a new maintenance policy for the company.
The Influence of Zalacca Short-Fiber Addition with Random Orientation on the Characteristics of Low-density Polyethylene Matriced Composites
Authors: Raharjo W P , Ariawan D , Kusharjanta B
Published: March 2021

The aim of this research is to study the influence of zalacca fiber addition on physical, chemical, and mechanical characteristics of LDPE matriced composites fabricated by hot-pressing method. The fibers were short, random-oriented and varied as 10, 20, 30, 40 and 50 wt. %. The examinations included density testing, XRD, TGA-DTA, tensile and flexural testing, SEM and DMA. There was a reduction in composite density due to fiber loading. The zalacca fiber addition did not change degree of crystallinity of composites significantly. There was a bit decrease in thermal stability caused by fiber addition. The composite tensile strength and modulus of elasticity were enhanced with addition of zalacca fibers up to 40 wt. %. Tensile strength and elastic modulus declined due to further addition of fibers. At 40 wt. % fiber loading, there were several fiber fractures indicating that the applied load was borne effectively by the fibers after transferred from LDPE matrix. The fiber loading induced a meaningful improvement of flexural strength and modulus. There was a raise in storage and viscous modulus of composites due to fiber addition. However, fiber loading decreased loss factor, thereby reducing their damping capacity.
Design of Kaplan-Series Propeller for Commercial Submarine by Varying Rake Angle and Number of the Blade to Obtain the Highest Thrust and Efficiency
Authors: Putra Y D , Zakki A F , Trimulyono A
Published: March 2021

The use of submarines has covered various fields, for instance, is the exploration and exploitation of offshore petroleum. Submarine production and operation costs are still very expensive. The efficient use of fuel can reduce operating costs and increase cruising time for submarines. It is necessary to design the most optimal propeller with the highest and most efficient thrust. In this study, a commercial submarine is applied with the Kaplan-series propeller and nozzle intended to increase propeller thrust. Based on previous research it is recommended that propeller design should involve the hull itself. Therefore, the submarine hull form will be simulated together with the propeller. By varying the number of blades and rake angles of each propeller, it is expected to obtain the highest thrust. There are 3 types of the number of a blade that used in this study i.e. 6, 8, and 10 blades. While the variation rake angles are 50, 100, and 150. The present study uses computational fluid dynamics to predict thrust and torque in open water conditions. The turbulence flow k-epsilon model was used in the simulation. The results revealed that Ka1080 Propeller with 5° rake angle has the highest thrust and torque, which is 201 kN and 181 kN.m. on the other hand, propeller Ka680 with 15° rake angle has the highest efficiency reaching 50.9%.
Numerical Simulation of Long Duration Sloshing Using Smoothed Particle Hydrodynamics
Authors: Trimulyono A , Rahardjo A F , Mulyatno I P , Manik P
Published: March 2021

The sloshing phenomenon is one of the events in a liquid carrier vehicle such as airplanes and ships. Sloshing is a dangerous phenomenon because sloshing can effect ship motions that create excessive motion in liquid carrier vehicles. Long duration sloshing is challenging problems to solve using smoothed particle hydrodynamics (SPH). Stable, accurate, and reliable computation time is tried to achieve by many researchers. In this study, long-duration sloshing in the prismatic tank is tried to reproduce using single-phase and two-phase SPH. Firstly, the experiment is carried out using prismatic tank, with three pressure sensors, and a forced oscillation machine. In this study, only roll motion is used to reproduce hydrodynamics pressure with a low filling ratio. The results show SPH could reproduce fairly hydrodynamics pressure with spurious pressure oscillation. Static pressure is well reproduced by SPH.
Design of Hug Machine Portable Seat for Autistic Children in Public Transport Application
Authors: Afif I Y , Maula M I , Aliyafi M B , Aji A L , Winarni T I , Jamari J
Published: March 2021

The prevalence of autism in Indonesia was estimated approximately 2.5 million people. There are at least 500 new cases was diagnosed annually. Self-injurious behaviour is one of the most prevalence in autistic children. Only a few studies had been done in Indonesia regarding autism issue. Therefore, this study aims to design a hug machine portable seat for autistic children, called Autism Hug Machine Portable Seat (AHMPS), which can be used in public transportation (bus and train) to provide safety and for comfortability and can be used for therapeutic aid with deep pressure stimulation. The design was based on the morphological and decision-making matrix to get the best concept. The results of this study were obtained a selected design concept and certain technical specifications for the AHMPS.
Characterization of Calcium Hydroxide-treated Zalacca Fibers for Improving Properties as Reinforcement for Composites
Authors: Raharjo W P , Raharjo W W , Kusharjanta B
Published: March 2021

Chemical treatment is done to enhance characteristics of plant fibers and its interfacial compatibility with polymer matrix. Calcium hydroxide is an environmental-friendly alternative. This research aims to explore the influence of calcium hydroxide treatment on chemical, physical, thermal, morphological, and mechanical characteristics of zalacca fibers as reinforcements for composites. The time of treatment were varied for 24, 48, and 72 h. Fiber content analysis, XRD, FTIR, TGA-DTA, SEM, density, and single fiber tensile testing were performed. The percentage of cellulose was decreased meanwhile hemicellulose and lignin were increased. There was a decrease in crystallinity and crystallinity index after Ca(OH)2 treatment. The treatment induced some chemical groups correlated to the slight increase of lignin and hemicellulose percentage. There was an improvement of thermal stability of the fiber up to 200°C. The observation using SEM revealed that there were cleaning and roughing effect on fiber surface. There was no significant change in fiber density due to the treatment. However, the tensile strength and elastic modulus were improved after Ca(OH)2 treatment but the decline happened in a longer time of treatment. Accordingly, Ca(OH)2 treatment up to 24 h is appropriate in enhancing the properties of zalacca fibers as composite reinforcements.
Prediction of the Hydrodynamic Performance of an Elliptical Blade Savonius Turbine using Computational Fluid Dynamics
Authors: Yusvika M , Sutaji A , Prabowo A R , Imaduddin F , Hadi S
Published: March 2021

Electricity is a renewable energy source that can be generated from natural energy resources. savonius rotor is a type of turbine which produces small-capacity electrical energy using the kinetic energy obtained in the water flow. The main driving force in this paper is to predict the hydrodynamic performance of elliptical blade savonius hydro turbines with computational fluid dynamics (CFD). A 3D unsteady simulation will be conducted using ANSYS-CFX 19. The elliptical blade profiles with vertical axis turbines are performed at different blade numbers of 2, 3, and 4 blades. The performance analysis results show an improvement in the coefficient performance value of the elliptical blade compared to the conventional semi-circular blade. Based on the results, the more appropriate results obtained at TSR 1.069 for three elliptical blades with a power coefficient value of 0.738.
Fabrication and Characterization of PLA/Nanocrystalline Cellulose Nanocomposite Filaments for 3D Printing Application
Authors: Kusmono  , Wiratma O E R
Published: March 2021

3D process is an additive manufacturing process widely used due to its low cost, high production rates, and ease process. One of the thermoplastic materials commonly used is polylactic acid (PLA). However, PLA has some weakness including low strength and thermal stability. To improve these properties, the addition of the reinforcement materials into the pure PLA must be done and nanocrystalline cellulose (NCC) is one of the potential reinforcement materials. The influence of NCC addition on the tensile and thermal properties of PLA/NCC nanocomposite filament was investigated. NCC was isolated from the ramie fibers using sulphuric acid hydrolysis. Dried NCC powder and PLA pellets were hand-mixed with different NCC concentrations of 0, 1, 3, and 5 wt%. The filament was prepared using a single-screw extruder machine at 185°C under the constant speed. It was found that the diameter of the filament was lower than that of the nozzle of the extrusion machine. The addition of 1 wt% of NCC into the pure PLA increased the tensile strength by 19.04% (from 48.41 to 57.63 MPa) and elastic modulus by 13.47% (from 1791.62 to 2033.07 MPa). The addition of NCC more than 1 wt% decreased the tensile strength and elastic modulus. The optimum NCC loading was achieved at 1 wt%. The presence of NCC had no a significant effect on the thermal stability of the pure PLA.
Numerical Analysis of Heat Transfer Improvement in Flat Tube Car Radiator by Using TiO2/Water Nanofluids
Authors: Kristiawan B , Wijayanta A T , Yaningsih I , Budiana E P , Hadi S , Himawanto D A
Published: March 2021

This research investigated two-phase heat transfer numerically using TiO2/water nanofluids to enhance the thermal performance in a flat tube car radiator. Nanofluid is a colloid dispersion in a nano-sized which is a breakthrough in terms of the thermal devices. The radiator is widely used in the automotive industry as a heat exchanger. The enhancement of thermal accomplishment was studied numerically by analyzing in thermohydraulic characterizations. A numerical study was conducted by TiO2/Water nanofluids using five concentrations consisting, that is, 0.05%, 0.5%, 1.0%, 3.0% and 5.0% and six Reynolds number variations. Nanofluids with volume concentrations of 0.05%, 0.5%, and 1.0% volume concentration indicated that the values of Nusselt number were lower compared to water. Meanwhile, the values of Nusselt number for nanofluids with volume concentration of 3.0% and 5.0% were higher than water. This occurs because the transfer coefficient enhancement was higher when compared to the increase of thermal conductivity.
Investigation of Ecohouse through CFD Simulation
Authors: Sari D P , Gunawan I , Chiou Y S
Published: March 2021

Natural ventilation and raised floor can be found in many traditional houses throughout Indonesia. Moreover, this concept currently applied for modern Javanese house called Ecohouse. The Ecohouse is a prototype single-family house with a raised floor, open plan, located in Cibinong, Indonesia. The investigations were made with the CFD DesignBuilder software package. CFD simulation is conducted to simulate wind behavior and the temperature of the buildings. Ventilation in the house is studied during the summer months. This research has found that the natural ventilation and raised floor of Ecohouse is the potential to provide thermal comfort inside the house. Flow patterns show raised floor and horizontal fin on the roof can reduce the heat store in the room. The result of the study will become a reference to optimize the performance of Ecohouse before applied it as a government recommendation for a residential house in Indonesia.
Modeling and Simulation of MISO-Buck Converter Using ANFIS on DC Microgrid Distribution System
Authors: Anggraini R P , Efendi M Z , Murdianto F D
Published: March 2021

Currently, the development of the utilization of renewable energy sources such as solar energy and wind energy has increased significantly. Interconnecting grid with renewable energy sources combination is developed to increase power and reliability of the system. However, when the energy sources are combined there will be many configurations of power distribution from each source, moreover the power produced by the renewable energy is fluctuating while the load requires a stable voltage and energy continuously even though the supply sources is changes. Therefore, Effective energy management is required to regulate the power distribution of both energy sources automatically that can provide energy to the load continuously and optimally. In this paper a MISO- buck converter is proposed to combine several energy sources using ANFIS. The simulation results show that ANFIS can maintain the output voltage with a very small minimum error percentage only 0.023% and can achieve a faster settling time of 4.032 ms if we compare with PID that is 1.489% for the error percentage and 12.308 ms for the settling time.
Binerization of Panoramic Dental Image for Dental Anatomy Identification
Authors: Fatkhurrozi B , Setyowati I , Nurhayata C R
Published: March 2021

Dental image is used for identification of a person because it can provide a lot of information about dental such as tooth contour, tooth position, and tooth shape. This research aims to process dental panoramic images in the form of greyscale images into binary images. Converting the greyscale image to binary is known as the thresholding process. The thresholding process is also called binerization. The input data used in this study is in the form of dental anatomical images produced by dental panoramic devices. The data used were 20 images, namely 10 abnormal dental images and 10 normal dental images. Results for the identification of dental anatomy with binerization the system and the manual calculation are the same. Identification normal dental are 50% and abnormal dental are 80%.
Utilization of Information System in Dies Control for Improvement of Quality and Production Efficiency in Manufacturing Industry
Authors: Pramono S , Yulia H , Jati B D , Ramelan A , Saputro J S
Published: March 2021

Utilization of Information Systems in Dies Control for Improvement of Quality and Production Efficiency in Manufacturing Industry is a system that is used to anticipate damage to dies before the dies are used, because if a damaged dies is used will be very detrimental to the company. There are 4 views: Dies master, Entry production, Dies maintenance and dashboard. Dies master is a page used for initial dies data input. Entry Production is a page that is used to input daily production output because from this page you will get actual OK production data and actual NG production which will be used to compare between the maximum use of dies and the number of actual OK production and actual NG production. If the sum of the actual Production OK and the actual NG production is greater than the maximum use of dies, the dies must be maintained immediately. Maintenance Dies serves as input data for maintenance Dies, in the maintenance dies page there are also 3 features: Entry Maintenance Dies functions as a date data input menu and only comments mainly because other data already exists on the master dies, Summary on Maintenance dies serves to display the date or last maintenance date and the last maintenance time interval with today, the Details on the Maintenance Dies function displays all dates if the summary only shows one last date the details display all dates, so you can find out how many times the dies have been maintained. and the last is this Dashboard function to display the results of all data that has been inputted. The main function is to display the status of dies, it will be seen if the red color of the dies has to be fixed, if the yellow color is warning because the number of hits is 90% of the maximum result of using dies, if green can still be used.