bluuebunny/crossref_metadata_2025_split huggingface dataset:
An overview of structural designs and building materials in shell structure for the mosque and the future development
Authors: Nugrahini F C 
Published: May 2020

Abstract
The developments of technology in realizing contemporary designs become a hot issue for the development of the mosque’s appearance and shape. The development of the shell building in the mosque which is quite attractive to the public was the construction of the Cologne Central Mosque in Germany in 2017. For the point of view that shape of the building is a new era in the use of shell structures in the mosque. The shell structure commonly used as a dome of the mosque that is used as a symbol of the mosque buildings in general use and continues to this day which began from the era of the caliphate. This paper will present a review of the structural designs and building materials on the shell structure of the mosque which has been developing from time to time. And can be used as a possible new reference in the future developments of mosque architecture.
Machinery parameter optimization of CNC milling programming towards process time
Authors: Widodo E M , Purnomo T A , Ariyanto N 
Published: May 2020

Abstract
The Tooling Department is a department engaged in manufacturing die, namely the manufacture of printing equipment to make components/pressed part made according to the desired design and processed on a pressing machine, die ordered from the customer, namely sole agent brand (ATPM). The manufacturing process has been running well so far, but to improve service and to reduce manufacturing die costs, it is necessary to improve time efficiency by optimizing machining parameters. The purpose of this study is to determine the machining parameters that produce optimal processing time in CNC milling programming. This study uses the Taguchi Method with the Orthogonal Array L9 pattern. Factors to be examined include cutting speed, feed rate, depth of cut and machining tolerance using a cutter ball nose Ø32 mm and Ø30 mm. Parameters that produce optimal machining process time in CNC milling programming for cutter ball nose Ø32 mm are at optimum cutting speed = 100480 mm/min, optimal feed rate conditions = 1200 mm/min, optimal depth of cut = 1.5 mm, and conditions machining tolerance = 0.09 mm. The machining process time produced under these conditions is 265.73 minutes. Whereas for cutter ball nose Ø30 mm is at optimum cutting speed = 103620 mm/min, optimal feed rate condition = 1280 mm/min, optimal depth of cut = 1.5 mm, and machining tolerance = 0.09 mm. The machining process time produced under these conditions is 265.51 minutes.
Reverse innovative design and manufacturing strategy for optimizing production time of customized orthotic insoles with CNC milling
Authors: Anggoro P W , Anhony A A , Tauviqirrahman M , Jamari J , Bayuseno A P 
Published: May 2020

Abstract
Reverse innovative design (RID) of insole shoe orthotics for patients with diabetes and the manufacturing strategy in optimizing the production time of the insole were examined in the present work. The plantar surface of the feet from two female patients was scanned using a 3D scanner yielding a 3D mesh foot for each patient resulting in an STL file format. The geometric shapes of the 3D models of the feet were fitted very well using curve based surface modeling (CBS-modeling) for insole orthotics design and integrated with CAM (computer-aided manufacturing). Optimization of the manufacturing time was simulated in CNC milling with the Taguchi approach. The manufacture of the optimal insole design was achieved at the optimum machining parameters such as toolpath strategy (A) with raster machining, spindle speed (B) of 15000 rpm, feed rate (C) of 900 mm/minutes, and step over (D) about 0.30 mm. The optimal design of the orthotic insole has the geometric tolerance (D) of 0.75 mm for patient 1 and 1.50 mm for patient 2. The optimal machining time for the insole of patient 1 is 3.79 and 4.02 hours for patient 2. The optimal machining time for the insole of patient 1 is 227.48 minutes and 241.65 minutes for patient 2. These valuable data are needed for the real manufacturing process of insole material in CNC milling.
Comparison of radiograph image information on lumbar vertebrae examination using the application of the anode heel effect theory
Authors: Adi E P , Iqbal M 
Published: May 2020

Abstract
Heel effect is a consequence of the focus line principle that the intensity of X ray radiation on the cathode side will be greater than the anode side. Related to the phenomenon of X ray emission, namely heel effect, the lumbar vertebrae object which is anatomically from cranial shrinks and enlarges until it reaches its maximum in the sacrum bone then shrinks to the apex of the coxygeus bone, on this examination it is necessary to consider the application of the anode heel effect theory. This study aims to determine whether or not there are differences in radiographic image information on the examination of lumbar vertebrae by applying and not applying the anode heel effect theory. Retrieving radiograph data is carried out with 5 research objects in the form of probands. The results of the radiograph are then measured using a densitometer to obtain a density value. To support the research data, questionnaires were conducted on 5 radiology specialists. Examination of the lumbar vertebra with the application of the anode heel effect theory produces different information on density, contrast, detail, and sharpness by not applying the anode heel effect theory.
Apology response strategies used by Indonesian EFL fresh graduates: on gender and academic achievement
Authors: Waluyo S , Sutiyatno S 
Published: May 2020

Abstract
The challenge for language teachers is to make the students able to communicate in the target language. One of the language aspects that many EFL learners, including university students, still struggle to produce appropriate responses is pragmatic competence. This study attempts to investigate whether gender and academic achievement were significant to predict Apology Response strategies used by EFL fresh graduates. Thirty fresh graduates, 18 females and 12 males, from an English Department of a state university in Indonesia were selected as the participants. Their academic achievement was simply derived from their GPAs which then were grouped into three levels of low, middle, high categories. The instrument used was Discourse Completion Task (DCT) which was used as scenario. The participants were asked to answer the DCT orally through interview. The DCT results were then classified into Acceptance (AC), Acknowledgement (AK), Evasion (EV), and Rejection (RJ). The three variables were then analysed using descriptive qualitative approach. The results were quite elaborate. Most of the participants tend to use Evasion strategy when responding to apologies; however, the number of males who apply Acceptance was also significant. Similarly, for the academic achievement, participants with high GPA do not necessarily employ Acceptance and vice versa. To conclude, neither gender nor academic achievement can be considered as the significant predicators of Apology Response strategies used by the participants. This study is expected to be useful for teachers or lecturers to consider Pragmatics studies in their teaching and learning activities.
The effect of problem-based learning on high school students’ problem-solving skill and comprehension of biological concept based on their academic performance
Authors: Taharu F I , Safilu  , Aba L 
Published: May 2020

Abstract
This research aims to find out whether there are : (1) the significant difference of problem-solving skill and comprehension of biological concept between students who are taught with Problem-Based Learning (PBL) strategy and students who are given direct teaching process; (2) the significant difference of problem-solving skill and comprehension of biological concept among students who are academically high, academically medium, and academically low; The population of the study was 183 students, the samples taken were 60 students. The study is a quasi experimental study. Descriptive analysis is used to describe and elaborate the data, whereas inferential analysis is used to find out the difference of Problem-Based Learning’s effect on the students’ problem-solving skill and the students’ comprehension of biological concept based on their academic performance. The result of the study shows that: (1) there is significant difference of problem-solving skill and comprehension of biological concept between those who are taught via PBL and those who are given direct teaching; (2) there is significant difference of problem-solving skill and comprehension of biological concept among the students who have different academic performance.
Enhanced electrical conductivity of counter electrode using hybrid of reduced graphene oxide assisted with customised triple-tail surfactant with multiwalled carbon nanotubes
Authors: Fatiatun  , Firdaus  , Jumini S , Suriani A B , Marwoto P , Wibowo K M , Astuti B 
Published: May 2020

Abstract
The fluorine-doped tin oxide (FTO) was utilized as a substrate in counter electrode (CE) fabrication using spray coating method. Hybrid of reduced graphene oxide (rGO) assisted by custom-made triple-tail sodium 1,4-bis(neopentyloxy)-3-(neopentyloxycarbonyl)-1, 4-dioxobutane-2-silphonate (TC14) and commercially available single-tail sodium dodecyl sulphate (SDS) surfactants with multiwalled carbon nanotubes (CNTs) were developed as CE in dye sensitized solar cells (DSSCs) application. The rGO was fabricated by using reduction process from GO solution synthesized by electrochemical exfoliation method. During the reduction process, the reducing agent of hydrazine hydrate was utilized to reduce the oxygen functional group in synthesized GO solution. Hybrid of TC14-rGO and MWCNTs presented better structural and electrical properties than pure TC14-rGO. Higher electrical properties of TC14-rGO/MWCNTs hybrid was believed makes faster electron transport for the dye regeneration in DSCCs measurement. Therefore, the TC14-rGO/MWCNTs hybrid CE thin film showed suitable to be applied and developed in DSSCs application.
Utilizing a web-based technology in blended EFL academic writing classes for university students
Authors: Turmudi D 
Published: May 2020

Abstract
This paper discusses a web-based instruction mixed with off-line learning in a blended EFL academic writing classes for undergraduate students. The concepts are constructed by reviewing selected and related articles based on the current trends of blended instructions with the aid of technology in education. The main ideas taken into account is how to make EFL academic writing practicality, and convenience, yet respecting norms and responsibilities of education principles. It is practical since it is flexible and can be done anywhere and anytime, yet within the consensus. Thus, the concept covers the conceptual framework of blended EFL academic learning mixed with face-to-face and web-based model as a unit of Blended EFL Academic Writing Classes. It is a theoretical description and procedural flow of face to face and web-based. This is hoped to assist any higher education educators in treating the students and contribute to the body knowledge of online learning in the era of information and communication technology (ICT) or currently known as virtual technology era.
Darrieus type vertical axis wind turbine (VAWT) design
Authors: Wasiati S W , Augusta F A , Purwanto V R P , Wulandari P , Syahrirar A 
Published: May 2020

Abstract
The potential of wind energy in Indonesia is generally relatively less compared to other countries in the subtropical region. With the Darrieus VAWT Type Vertical Axis Wind Turbine, the turbine does not have to be directed to the wind to be effective. Mill with vertical axis, generator and gearbox can be placed near the ground, so the tower does not need to support it and is more accessible for maintenance purposes. Gearbox or transmission is one of the main components of the motor which is referred to as a power transfer system, the transmission functions to move and change the power of the rotating motor. To get a large turbine torque, a gearbox design (large size on the turbine, and a smaller size on the rotor generator) is needed. The number of blades used will also affect the effectiveness of the turbine in capturing the wind. With the number of 3 blades, get torque above 40 rpm, at wind speeds of 4.5 to 5 m/s.
Vertical axis wind turbine analysis using MATLAB
Authors: Augusta F A , Afif A Al , Wulandari P , Syahriar A 
Published: May 2020

Abstract
Wind Turbines have become one of the feasible power plants to replaced fossil fuels. Because this plant is affordable cost and did not produce pollutants as an output. Vertical Axis Wind Turbine can be placed at points with high wind intensity such as; toll roads, ships, railroads, airports. The energy produced can be distributed for the civilian house light, the street lights, the fishing boats light, others. The hope is that wind turbines can generate 100 watts of power, so that charging time can be at least 6 hours. But, the average velocity data in the field is worth under 2.85 m/s (minimum wind speed to get 100 watt). Resulting in a turbine charging time more than 6 hours. In this case, The Turbine needed more than one accu as a place to store the energy even the accu take more than 6 hours to be charged.
Designing parallel computing using raspberry pi clusters for IoT servers on apache Hadoop
Authors: Nugroho S , Widiyanto A 
Published: May 2020

Abstract
The community has widely used the IoT tool because it makes it easy for users in various sectors. The implementation of IoT does not only require connectivity and devices but also requires a server. Servers that are accessed by many devices will have more and more computing processes on the server. The computing process on the server requires a high-performance but small-sized server device that is easy to connect with other devices. Raspberry Pi, known as an IoT server, is a computer with a small size, cheap, and very energy efficient. The parallel machine was built based on Raspberry Pi using parallel computing technology to have high performance. Nowadays, one of the parallel computing tools is Apache Hadoop. This research using clusters method with four pieces of Raspberry Pi with parallel computing technology using Apache Hadoop tools. Testing is done using Siege tools. The number of requests that used to test web server performance in this research was 10, 50, 100, and 150. The most optimal results are on requests by 50 with an increase of about 260% from a single node to cluster in the measurement of transactions, transaction rates, and throughput. Testing with 150 requests can only increase by 50% to 60%.
The relation of compressive strength and tensile strength of bamboo fibber for soil stabilization
Authors: Siswanto J , Latifah K , Supriyadi B , Rochim A , Alzami F 
Published: May 2020

Abstract
Bamboo can be used in construction planning because based on its properties, the mechanical strength of bamboo has high tensile strength and high compressive strength so that it can be used for soil reinforcement. Bamboo which has good quality will also have good mechanical properties as well because bamboo which has good compressive strength, laboratory results also show that bamboo has good tensile strength as well. Thus, there is a correlation between compressive strength and tensile strength in bamboo which is an environmentally friendly material as a soil strengthening material. The data in this study were using bamboo Apus and Javanese bamboo. Because bamboo is often used in industry and is easily available in Semarang. This study uses a simple linear method (Ordinary Least Squares). Simple linear regression model is one of the regression models that are often used in regression analysis. The dataset divided into 2 part, namely by comparing 60% of training data and 40% of testing data. The result from the data testing showing linier regression (least squares) estimate becomes very sensitive to random errors in the observed target, producing a large variance and the following results are obtained Correlation Coefficient 0.99607873, Mean Squared Error 12. 58799, Variance Score 125.60. The results show that the correlation coefficient is 0.99607873, it’s mean that the linear model is close to number 1 meaning that this model is a good model because the correlation coefficient value is close to 1 so there is a positive relationship between or positive correlation between the compressive and tensile tests.
Prototype design of automatic plant watering equipment with soil moisture detection system based on arduino uno microcontroller: case study of chili plant
Authors: Rosadi A , Fauzan A , Winarno  
Published: May 2020

Abstract
Indonesia is an agrarian country, and most of the population’s livelihood is in the agricultural sector. One of the results of agricultural commodities is chilli. The chili is a vegetable commodity that cannot be separated from the daily needs of the community. In the process of planting chili plants, water requirements greatly affect the growth of chili plants. However, along it was with the occurrence of delays in watering, especially in the dry or hot season. Watering chili plants based on soil moisture was one way to treat chili plants properly. Using the Arduino Uno microcontroller was as the main controller for the automatic chilli watering program. The program received input from the sensor soil moisture. The soil moistures were a sensor that worked to determine soil moisture, so when the soil was under certain humidity conditions it can water the chilli plants automatically.
Design and consideration of off-board lithium-ion battery charger for electric vehicle
Authors: Rusli M R , Mukhlisin A , Raharjo J , Yuniarto M N , Wikarta A , Haerudin H 
Published: May 2020

Abstract
Recently the development and population of electric vehicles (EV) has increased significantly in line with the issue of reducing air pollution and fossil fuel dependence. EV uses batteries as the main energy source and Lithium-ion (Li-ion) batteries are more widely used by the consideration of having high energy, life cycle, and power density. As same as the ITS electric scooter which uses a Li-ion type battery pack with an operating voltage of 100 V 3.2 kWH. A battery charger has a crucial role in charging a battery pack. In this article, design, consideration, and implementation of an off-board Li-ion battery charger has been described. As a result of the proposed charger experimental test, it was capable for portable charger and producing power output up to 2.5 kW, power quality was improved through the power factor correction (PFC) which had the value above 0.75, charger efficiency was above 87%, programmable setting, temperature cut-off, and could be integrated with a battery management system (BMS) through CAN communication. The charger is expected to be reliably used for EV especially ITS electric scooters by using those features.
MERA (motorcycle emergency ride assistance): plug-in for accident detection and notification
Authors: Balafif S , Purnomo D , Haryanti T 
Published: May 2020

Abstract
The condition to trigger the Automatic crash detection for motorcycles is more complex, since the collisions in real life are usually different than those in the lab. so in order to boost the accuracy and affectivity, the researchers must reduce inconsequential deployments, the occupant weight, and riding condition, as well as re-calculate the speed to crash conditions. In this paper was present a continuously evaluates and innovate for crash detection with support automated notification system. The accident detection, communicates the accelerometer, vibration, speed and lean values to the determine accident status and level. In this concept, three different variable measurements are attached to head of the motorist and motorcycle body, Crash dummy tests are done for trial particular systems in helmet by throwing the helmet with different altitudes to simulate the effect of crash to the motorist, and for capture the location of accident, real data is collected by driving the motorcycle. The implemented prototype system showed promising results for automatic crash detection, and the system also showed its success for deliver real-time notifications when an accident was happening.
Study of rare earth elements and heavy metals in tin tailing from mining activities on North Bangka Island
Authors: Andini D E , Sari F I P 
Published: May 2020

Abstract
Rare earth elements (REE) are important minerals, especially in the defense sector and the modern high biotechnology production materials industry. REE and heavy metals are found in minerals associated with lead deposits. This research was conducted to determine the potential of REE and heavy metals in tailing or waste minerals which are the residual results of mining in tin mining at sea and on land. Sampling locations include primary tin or alluvial tin mines in six locations that represent locations at sea and on land using the analysis of neutron activation analysis (NAA) and X-Ray Fluorescence (XRF) obtained the potential content of REE and heavy metals deposited in primary mines on land. In tailings samples in active mining carried out on land and at sea there are rare earths and heavy metal contents, although with relatively small amounts.
Utilization of fatty acids from the edible oil industry in synthesis of 2-hydroxy propyl palmitate as a bioaditive solar fuel
Authors: Burhan R Y P , Zetra Y , Pusparatu  , Suprapto  , Hidayat A T 
Published: May 2020

Abstract
The sulphur content in diesel oil must be less than 0.5% by weight of diesel oil, because the high sulphur content will accelerate the occurrence of wear and tear on the engine cylinder walls. For this reason, desulphurization is carried out to reduce sulphur content in diesel oil. The process of desulphurisation of diesel oil causes a decrease in the lubricating power of diesel oil to the engine so that the addition of additives is needed. In this research, bioaditive substances in the form of 2-hydroxy propyl palmitate have been synthesized from the cooking oil industry fatty acids. The reaction begins with esterification of palmitic acid with BF3 / methanol to produce a methyl palmitate ester with a yield of 72.13%. Furthermore, methyl palmitate ester was esterified using propylene glycol and K2CO3 as a base to produce 2-hydroxy propyl palmitate which acts as a bioaditive with a yield of 52.90%. Structure identification is done by Gas Chromatography-Mass Spectroscopy (GC-MS) method.
Usability analysis of disaster information systems using usability testing
Authors: Purnomo T A , Widyanto R A , Setiawan A , Hendradi P , Suksmasetya P 
Published: May 2020

Abstract
The Central Java region is the highest disaster-prone region in Indonesia in the period January - May 2019. The disasters occurred, in total of 554 times, with a total of 14 fatalities, 7 injured, 98,208 affected and displaced. Natural disasters cannot be avoided, but their impact can be minimized with good management. Disaster management and anticipation include utilizing information systems. A good information system is a system that makes it easy for users. The level of usefulness of this system, must be measured whether this system will be useful or not. This research is focused on testing the interface of the Disaster Information System belongs to BNPB Magelang. The method used is Planning and Analysis, Usability Evaluation, Data Analysis and Data Presentation. This measurement is done by the usability testing method. Based on the measurement results of the usability level of the Disaster Information System, a value of 3.35 was obtained. Based on the Linkert Scale, this system is said to be Usable. The results of the research can describe the reusability level of disaster information systems and to recommend in improving aspects of reusability.