bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of The Nearest Neighbor Algorithm for Classification of Online Taxibike Sentiments In Indonesia In The Google Playstore Application
Authors: Setyorini Sindhy Genjang , Mustakim  
Published: October 2021

Abstract
Google playstore is an official platform that provides applications to services, and not only that, user can perform assessments and reviews after using the Google playstore. One of the applications and services provided by Google playstore is online transportation. There's a couple of online transports available but at this time's research just scanned the official transport account of gojek and grab online. The data used in this study were application review data and service review data from the two online transportations which are processed using the K-Nearest Neighbor and Improved K-Nearest Neighbor algorithms by comparing the accuracy values. An experiment was conducted to divide the data with 5 K on the K-Fold Cross-Validation. The results of the comparison of the KNN application data were that Grab had a higher accuracy of 77.77% compared to Gojek which had an accuracy value of 66.24%. In terms of the Data Services using the IKNN algorithm, Grab had a higher accuracy value of 78.23% while Gojek had an accuracy value of 48.19%. Meanwhile, from the time complexity of the process, the IK-NN algorithm is better than the K-NN.
Effects of The Addition of Complexing Agents on Curcumin Stability Using Accelerated Shelf Life Testing
Authors: Pranata Alvin , Surya Reggie 
Published: October 2021

Abstract
Curcumin as a natural colorant product from turmeric used in food industry has low stability. Curcumin is easily oxidized due to light, oxygen, or high temperature. One of the methods that can be used to increase its stability is by complexation process using metal ions. The aim of this research are to determine product shelf life and the best complexing agent to increase curcumin stability. In this research there were three complexing agent used to form curcumin complex. Then, the stability of products are measured through curcumin concentration parameter and based on its shelf life using Accelerated Shelf Life Testing (ASLT) method. The results stated that curcumin-Zn complex exerted the highest stability against control and other complexing agent, hence the shelf life was projected to increase by 10-15 days at 35°C compared to untreated liquid curcumin. Conversely curcumin-Fe complex demonstrated the lowest shelf life due to the role of Fe as a potential oxidizing agent.
Development of 3D Physics Learning Media using Augmented Reality for First-year Junior High School Students
Authors: Azhar  , Herfana Poppy , Nasir Muhammad , Irawan Dedi , Islami Nur 
Published: October 2021

Abstract
This study aims to produce 3D physics learning media in Indonesian first-year Junior High Schools (SMP/MTs) using Augmented Reality (AR). This research development uses the ADDIE (Analysis, Design, Development, Implementation and Evaluate) model. The development stage was carried out at the Physics Education Laboratory of the FKIP University of Riau and the implementation stage was carried out on 30 first-year students of SMPN 30 Pekanbaru. The 3D learning media validation sheet instrument by using AR consists of four assessment aspects, namely; (1) design aspects, (2) pedagogical aspects, (3) content aspects, and (4) technical aspects. Validation was carried out by six validators consisting of 2 material experts, 2 media experts, and 2 physics teachers. The results of six-validator assessment provide an average for each aspect as follows; (1) the design aspect has an average of 4.43 which is categorized as very valid, (2) the pedagogical aspect has an average of 4.42 very valid categories, (3) the content aspect has an average of 4.38 very valid categories, and (4) the technical aspect has an average of 4.51 which is also categorized as very valid. Overall the average validity for the four aspects of the assessment is 4.43 very valid categories. After the 3D physics learning media was developed, it was then declared feasible by the experts, the implementation phase of 3D physics learning media or small-scale trials on students was carried out to see the students' responses to 3D physics learning media. The student response test was carried out using a student response questionnaire containing 10 statements consisting of 6 aspects of assessment. The results of the students' responses at the implementation stage showed that 67% of the 30 students thought that 3D learning media using AR was very good for use in the learning process. Then 33% of 30 students think that 3D learning media using AR is good for use in the learning process. Certainly the 3D physics learning media product is suitable for use in the physics learning process in Junior High Schools.
Hydroxyapatite Coating On 316L Stainless Steel Using Dip Coating Technique
Authors: Fadli Ahmad , Kristin Fransisca , Arini Putri , Wisrayeti  , Yenti Silvia Reni , Irianty Rozanna Sri 
Published: October 2021

Abstract
316L stainless steel is one of the metal biomaterials used in implant applications because it has excellent mechanical strength. To improve the biocompatibility and activity of metals, a coating on metal surfaces is required. 316L stainless steel is coated with hydroxyapatite using a dip coating technique. Firstly, the suspension was prepared by mixing 10 grams of hydroxyapatite, 1 gram of sago starch, with distilled water with certain weight which was then stirred at a speed of 250 rpm for 20 hours. The substrate then dipped 1 time with dipping time for 20 seconds. Coating hydroxyapatite was sintered at temperatures of 600°C, 700°C and 800°C for 1 hour. The results show that the thickness of the hydroxyapatite layer on the substrate has decreased with increasing amount of distilled water used. However, the thickness of the layer increases with increasing sintering temperature. The best value of shear strength was obtained in the addition of 16 grams of distilled water with sintering temperature of 800°C which is 11.78 MPa. Furthermore, the coating attached to all substrates is hydroxyapatite with an average composition of 99.37% as evidenced by the results of XRD analysis.
Comparison of Efficiency of Activated Carbon Between Coffee Grounds, Soybean Straw and Tea Leaves
Authors: Dulyaseree Paweena , Mahasae Firdaus , Hayeekueji Nufateehah , Yordsri Visittapong 
Published: October 2021

Abstract
Efficiency of activated carbons (ACs) between coffee ground, leaves soybean straw and tea leaves were investigated. All three types of waste can be found widely in the local area. The synthesis of ACs consists of 2 parts. Firstly, preparation of coffee grounds, tea leaves and soybean straw were dried at 100 °C for 24 h, and then carbonized at 560 °C. Second part, the activated carbon was activated with 1 molar of nitric acid (HNO3) and after that was activated by 1 molar of potassium hydroxide (KOH), washed with DI water to neutralize and dried at 100 °C. Their surface morphology and functional group of the ACs were characterized. The morphology of soybean straw shows the high porosity and increase in oxygenated functional group, implies that easy allow water to seep into surface. These results suggest that can be use filtrate material for filtration system.
The Preliminary Studies on the Tremendous Degradation Rate of Methylene Blue with Cu-doped α-MnO2 Photocatalyst Under UV Light Irradation
Authors: Anggraini Riska , Siregar Siti Saidah , Awaluddin Amir , Linggawati Amilia 
Published: October 2021

Abstract
Dye contaminations have severe impacts to environment (air, soils, plants, water) due to their adverse effects. Most dyes are toxic, carcinogenic, mutagenic and resistant to bio-degradation. Photocatalysis-based advanced oxidation process (AOP) has been considered as the most effective and efficient way to treat this recalcitrant compounds. Manganese oxides are ubiquitous and environmentally friendly in natural environments and can act as semiconducting materials. Tunnel structure of manganese oxide such as α-MnO2 (cryptomelane) has been widely studied for broad applications as Fenton-based AOP. Catalytic efficiency of α-MnO2 could be further increased by doping α-MnO2 with a metal ion like the Cu ion. Although the synthesis and catalytic activity of Cu-α-MnO2 have been reported by previous studies, its photocatalytic performance using this one-pot-sol-gel approach for MB degradation has never been reported previously. Herein, Cu-doped α-MnO2 was synthesized by one-pot sol-gel method and characterized by X-ray diffraction (XRD), BET surface area and atomic absorption spectroscopy (AAS). The AAS results suggested the presence of Cu ions in α-MnO2 since the increase in doping Cu resulted in the corresponding increase in Cu content in the α-MnO2. The BET surface area indicated that the doping 10% Cu in α-MnO2 led to about two fold increase in suface area compared to undoped α-MnO2. The photo catalytic performance of Cu-α-MnO2 via UV light irradiation for the degradation of methylene blue (MB) was significantly higher that that of undoped α-MnO2 and was associated with the increased in surface area of Cu-α-MnO2 over undoped α-MnO2. The maximum degradation of MB was 97.9, 98.3, 98.7 and 99.5% achieved using α-MnO2, 1% Cu-α-MnO2, 5% Cu-α-MnO2, and 10% Cu-α MnO2 and 10% Cu-α-MnO2.
MQ-2 Gas Sensor using Micro Controller Arduino Uno for LPG Leakage with Short Message Service as a Media Information
Authors: Sohibun  , Daruwati I , Hatika R G , Mardiansyah D 
Published: October 2021

Abstract
This research was to detect leakage of liquified petroleum gas (LPG) gas automatically. Design of this device consists of a gas detection sensors LPG MQ-2, which serves to detect the levels of LPG in the air, the sensor signal analog is converted to digital by the ADC and processed by a microcontroller Arduino Uno to command activation of the buzzer and SMS (short message service), sensor system is also capable of displaying a LPG gas concentration detected by the LCD in ppm. The study was conducted at three different space conditions of the open, semi-open and closed, based on the distance detection and characterization. The analysis of the data obtained, that the tool to work optimally at a distance of 3 cm closer to the source of the leak tool then the maximum LPG gas leak detection tools. Based on the characterization of the sensor that is an accuracy of 1 V to 2.6 V and repeatability error of the three conditions of the room is < 10%, so that the tool is expected to cope with and anticipate the risk of accidents due to leakage of LPG gas early and real time.
Physical Modelling for the Analysis of Wave Characteristics on Tropical Peat Coast
Authors: Sutikno Sigit , Ziaulhaq Ilham , Rinaldi  , Yamamoto Koichi 
Published: October 2021

Abstract
Coastal erosion problems have been occurring continuously during at least the last 30 years along the coast of eastern Sumatra, particularly in the north part of Bengkalis Island that facing directly the Malacca Strait. In the extreme case, the coastal setback on Bengkalis Island has reached 30 m/year. The transport and deposition of peat material in the tropical coastal area is a unique phenomenon that has apparently never been explored until nowadays. Most studies have focused on the transport and deposition dynamics of sediment of cohesive and sandy material. It is therefore very important to understand the wave characteristics on tropical peat coast in order to countermeasure the problems triggered by this degradative process. The purpose of this research is to develop a physical modelling to understand the wave characteristics on tropical peat coast. Two important parameters such as wave reflection and dissipation were analysed using wave channel and artificial beach in laboratory. The artificial beach was simulated using peat, permeable, and impermeable material with 15° and 90° beach slope. The results showed that the reflection and the dissipation coefficient at peat coast tend to close with the impermeable coast both for 15° and 90° slope.
Utilization of Pozzolanic Material to Improve the Mechanical Properties of Crumb Rubber Concrete as Rigid Pavement – A Review
Authors: Abdurrahman H , Rizaldi N , Wijaya M F , Olivia M , Wibisono G 
Published: October 2021

Abstract
Over the last few decades, waste tires have piled to an explicitly large number, posing a serious environmental threat in the worldwide. By reusing waste tires in concrete mixes in the form of crumb rubber, it was reported that crumb rubber improved concrete energy absorption, delayed the deformation time, and prevented sudden failure, which could enhance the rigid pavement performance. However, crumb rubber tends to reduce concrete strength primarily because of a lack of bonding between the smooth rubber surfaces and cement paste, resulting in a tiny gap in the concrete ITZ. The decrease in strength caused by crumb rubber can be solved by utilizing pozzolanic materials such as nano-silica, fly ash, and rice husk ash as additive materials or partial replacement of cement to improve the concrete pore structure through pozzolanic reaction and to enhance the adhesion between crumb rubber and cement. It was shown that pozzolanic materials, as mentioned above, managed to improve the strength of crumb rubber concrete with nano-silica showed the best effectiveness compared to fly ash and rice husk ash in creating high-strength crumb rubber concrete for application as a rigid pavement material.
A review of automatic solar tracking systems
Authors: Mohamad A , Mhamdi H , Amin NAM , Izham M , Aziz NA , Chionh SY 
Published: October 2021

Abstract
Solar tracking systems which can track the Sun movement can increase the power generation rate by maximizing the surface area of the solar panels that are exposed to the sunlight. By utilizing a solar tracker, the number of solar panels needed to generate the same amount of electrical energy will be significantly lower. In general, solar tracking systems are classified as single-axis solar tracking systems and dual-axis solar tracking systems. Several researchers had conducted both simulation and experimental work to compare and evaluate the performance of solar tracking systems against static solar panels systems, as well as between different solar tracking system mechanisms. General agreements among the researchers are that the performance of solar tracking systems is always exceeding that of static solar panels. Some researchers also conducted studies on how the weather conditions affect the performance of solar panels, and they concluded that the systems with tracking mechanisms are more resilient toward a variation of weather conditions.
Low Velocity Impact Behaviour Analysis of Different Fibre Stacking Sequences of Glass Fibre Reinforcement Composite.
Authors: Wong Jing Wen , Tan Chye Lih , Azaman M D , Azmi A I , Ming Ming Irina Wong 
Published: October 2021

Abstract
Furthering understanding the damage deformation behaviour involved in the impact test of Fibre-reinforced composite material is important in designing for the structural components. Thus, this study presents the damage effect of different stacking sequence of glass fibre reinforce polymer (FRP) composite on low-velocity impact test (LVI). The glass FRP composites were fabricated using vacuum-assisted resin transfer moulding process, which is capable of producing constant thickness with high volume fractions of composite laminates as compared to the traditional wet hand lay-up method. The physical and impact properties were determined according to the ASTM D7137 standards. It was found that, bi-axial glass FRP composite can afford the energy until 90J and without the post perforation occurred, which mean that from the LVI test, the architecture weave of bi-axial glass FRP composite was showed high performance as compared to the unidirectional glass FRP composite. Lastly, component failures such as resin cracking, fibre breakage, fractured knit, fibre buckling, and delamination were also highlighted in this paper.
Structural and mechanical characterisation of cellulose nanofibers (CNF) from Pennisetum Purpureum reinforced with polylactic acid (PLA)
Authors: Revati R. , Anas W. A. W.M. A. , Abdul Majid M. S. , Ridzuan M. J. M. , Tahir M. F. M. 
Published: October 2021

Abstract
This study aims to develop a composite scaffold based on polylactic acid reinforced with cellulose nanofibers from Pennisetum purpureum (PLA/CNF). The composite scaffolds were prepared via solvent casting and particulate leaching technique; sodium chloride (NaCl) was used as the porogen material. The influence of CNF on PLA is investigated; scaffolds were fabricated with different content of CNF (5%, 10% and 15%). The prepared composite scaffold was characterised using porosity measurements, Fourier-transform infrared spectroscopy (FTIR) and the compression strength and modulus were also evaluated in this study. The PLA/CNF scaffolds were highly porous with porosity higher than 80%. It was also shown that the porosity had a slight decrease with increasing CNF contents due to the compact arrangement of CNF within the scaffolds. Compression strength and modulus also show an increase in value as the CNF content increases. The results also show that introducing CNF to the PLA matrix can be considered beneficial for cartilage regeneration, cell attachment, and extracellular matrix (ECM) production.
Performance study of hydroxyapatite cow bone based polysulfone mixed matrix membrane: Effect of hydroxyapatite morphology
Authors: Suhaida Rasman Siti Nor , Jamalludin Mohd Riduan , Kamarudin Suraya Najieha , Hubadillah Siti Khadijah , Budiman Pauzan Mohammad Arif , Dzarfan Othman Mohd Hafiz 
Published: October 2021

Abstract
In this work, polysulfone (PSf)/hydroxyapatite (HAp) ultrafiltration mixed matrix membranes (MMMs) were prepared for wastewater treatment by using phase inversion method. The effect of hydroxyapatite (HAp) dispersion on the PSf/PVP membrane surface were investigated. Characterizations were done to observe the distribution of HAp on the membrane surface by using X-ray diffractometer (XRD) and scanning electron microscope (SEM). The XRD analysis showed the crystallinity of the HAp derived from cow bone. The dispersion of HAp in polymer matrix is a promising materials that can change the structure of the PSf membrane.
Investigating and improving Boeing aircraft composite panel industrial painting issues by designing smart robotic precision painting system
Authors: Hassan M A S M , Shahriman A B , Razlan Z M , Kamarrudin N S , Hashim M S M , Khairunizam W K N , Harun A , Ibrahim I , Faizi M K , Fadzilla M A , Rahman M F A , Hamid N M F N A , Manaf A A , Rani M F H 
Published: October 2021

Abstract
Aerospace Composites Malaysia (ACM) Sdn Bhd produces one of the aircraft components, which is an aircraft composite panel. Currently, the painting of the composite aircraft panel is manually conducted by the high skilled human operator. However, there are several issues of manual painting, which are the precision of the thickness specifications, uneven spray, dust-free, microbubble, colour appearance, and contour of the aircraft composite panel. Consequently, these issues contribute to the aircraft aerodynamic performances, productivity, and index time of the aircraft composite panel’s production. Thus, the main objectives are to investigate the human painting mimicking robot incorporated with the existing painting environment. The proposed environment becomes smart precision painting systems. In conclusion, the proposed prototype will overcome the quality issue of aircraft composite panel painting faced by Boeing worldwide aircraft industries. Furthermore, the proposed prototype will increase productivity and contribute to the maintaining of the aircraft’s aerodynamic performance.
Analysis and Evaluation of Optimized Lower Limb Prosthetic Device
Authors: Khan S F , Noor Z N M , Abdul Rani A M 
Published: October 2021

Abstract
Transtibial prosthetic devices or below-knee prosthetic devices are used as assistive devices in replacing the part of the leg below the knee joint in case of amputation. The different builds in amputees require the need for the accessibility to custom-made lucrative prosthetic devices in order to reintegrate the amputees into society. The goal of this study is to design a personalized transtibial prosthetic device that closely mimics the human gait by the use of topology optimization. Additive manufacturing is used to reduce the fabrication time of a traditional transtibial prosthetic device. The creation of the transtibial prosthetic device model is through computer-aided drawing (CAD) and afterwards simulated using ANSYS for the comparison and contrasting of the optimized design. The materials used in the design of the transtibial prosthetic device are polypropylene and titanium alloy. Simulation works reveal that there is a 12.8% reduction in the minimum equivalent (von-Mises) stress and a 51.29% reduction in the minimum equivalent elastic strain of the benchmark socket, and titanium alloy is the superior material in the fabrication of prosthetic foot as it greatly reduced the total deformation, equivalent (von-Mises) stress and equivalent elastic strain of the SACH foot as compared to polypropylene in the initial contact, midstance and the push-off phases of the gait cycle. Topology optimization of both the socket and foot models reduced the stiffness and density of material volume up to 60%. Voronoi pattern developed on the socket and foot models mirrors the reduction done on material volume by topology optimization.
Numerical Study of Blade Roughness Effect on Cavitation in Centrifugal Pumps
Authors: Bishtawi Basel Al , Scribano Gianfranco , Tran Manh-Vu 
Published: October 2021

Abstract
Cavitation is classified as an undesirable complex multiphase phenomenon due to its negative effects on the structural and flow behaviours of hydraulic machineries, specifically centrifugal pumps. Typically, the pump’s cavitation performance tends to vary due to a multitude of factors, one of which is the impeller blade roughness. In this study, a numerical analysis is conducted, using ANSYS Fluent 20.1, to evaluate the relationship between the impeller blade roughness and the cavitation performance of an ISO 80-50-250 centrifugal pump operating at different pressures and flow rates. The operating conditions include net positive suction head (NPSH) values set at 20, 7.25, 5.71, 2.58, 1.1 m along with outlet mass flow rates of 40, 50, 60 m3/h while the blade roughness height value is changed to 1, 20, 80 μm. The SST k-ω turbulence model, along with the Zwart-Gerber-Belamri cavitation model is used. The results showed that the pressure head increased by approximately 1.64%, 1.55%, and 1.90% at flow rates of 40, 50, and 60 m3/h when the roughness height was increased from 0 μm to 80 μm. However, the increase in roughness improved cavitation inception simultaneously. Meanwhile, the blade suction-side witnessed a delay in cavitation formation, as it shifted downstream towards the trailing edge from its initial point of formation at the blade passage.