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SSRN 2023年

作者： Rahmadiawan, Dieter Abral, Hairul Shi, Shih-Chen Ilham, Mohammad Khalid Sugiarti, Eni Muslimin, Ahmad Novi Ilyas, R.A. Zainul, Rahadian Department of Mechanical Engineering Universitas Negeri Padang Sumatera Barat Padang25173 Indonesia Tainan Taiwan Laboratory of Nanoscience and Technology Department of Mechanical Engineering Andalas University Sumatera Barat Padang25163 Indonesia Research Collaboration Center for Nanocellulose BRIN-Andalas University Padang25163 Indonesia Serpong Indonesia Weaponry Technology Study Program Defense Technology Faculty Indonesia Defense University Sentul Bogor16810 Indonesia School of Chemical and Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia Johor Bahru81310 Malaysia Department of Chemistry Faculty of Mathematics and Natural Science Universitas Negeri Padang West Sumatera 25171 Indonesia

The preparation method of cellulose films plays a vital role in their properties. This work aims to characterize 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized bacterial cellulose powder (TOBCP) films prepared with three different methods (casting, boiling-casting, and boiling-vacuum). It is found that film by casting (CT film) shows the best electrical properties. A light-emitting diode (LED) in a direct current circuit connected to the CT film glows the most brightly. However, this film had lower tensile strength and thermal stability than films from boiling and boiling-vacuum techniques. The boiling-vacuum film presents the most compact fiber structure and the highest tensile and thermal properties. This film also shows the lowest electrical properties and the dimmest LED light. These results demonstrate the TOBCP properties from different methods that can be used to prepare film with desirable properties. © 2023, The Authors. All rights reserved.

关键词： Light emitting diodes

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Respiration and Maturity Assessment of Mango (Mangifera Indica Cv. Arumanis) for Long-Distance Transportation Planning in Indonesia

SSRN

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SSRN 2023年

作者： Kailaku, Sari Intan Arkeman, Yandra Purwanto, Y. Aris Udin, Faqih Agroindustrial Engineering Study Program Graduate School IPB University Bogor16680 Indonesia Research Center for Agroindustry National Research and Innovation Agency Jakarta10340 Indonesia Agroindustrial Technology Department Faculty of Agricultural Technology IPB University Bogor16680 Indonesia Department of Mechanical and Biosystem Engineering Faculty of Agricultural Technology IPB University Bogor16680 Indonesia Center for Tropical Horticulture Studies IPB University Bogor16680 Indonesia

Transportation of mango (Mangifera indica) is a significant challenge in a large archipelago country like Indonesia. This study addresses the quality assurance problem of long-distance transportation of mangoes from Java Island, Indonesia, and recommends the optimal harvest age for different transportation schemes in the Indonesian mango supply chain. The study investigated harvested mangoes at three different maturity levels and evaluated their quality characteristics, including climacteric peak and respiration rate, total soluble solids, acidity, firmness, dry matter concentration, and weight loss. Samples were kept in their respective packaging during storage to imitate transportation conditions, and an Internet of Things (IoT)-based system was used for real-time monitoring and remote access to the storage conditions information. Long-distance transportation cases of six destinations with different distances, modes of transportation, travel durations, and environmental conditions were studied. Mango harvested at 105 and 108 days after flowering is suitable for consumption, while the harvest age of 90-95 days after flowering is recommended for longer transportation durations involving non-refrigerated and refrigerated vehicles. The harvest age of 105 days after flowering is appropriate for long-distance transportation with non-refrigerated vehicles, while 108 days after flowering is only recommended for inter-province transportation with non-refrigerated vehicles with a short duration of transportation. The results emphasize the importance of determining the optimal harvest time based on the climacteric peak and quality changes during storage to ensure that mangoes meet consumer demands and maximize their quality and shelf life. © 2023, The Authors. All rights reserved.

关键词： Fruits

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Reducing non-productive time of mud pump with acoustic emission monitoring techniques on fluid end parts

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IOP Conference Series: Materials Science and engineering 2021年第1期1034卷

作者： Hilman Hilmawan Hasan Basri Mechanical Engineering Master Study Program Sriwijaya University Jalan Srijaya Negara Bukit Besar Palembang Sumatera Selatan 30139 Indonesia

This research conducted for overcoming the high non-productive time (NPT) damage of fluid end part mud pump in the drilling of PT. Pertamina PDSI Drilling Rig # 42.2/N1500-E Well SWI-001 at Pali, South Sumatra, Indonesia. The purpose of this study is to provide a solution for detecting early worn out of fluid end part with the innovation of the electric audio module (EAM), which is suitable for conditions in the field. This EAM works using the method of detecting acoustic emission signals from piezoelectric sensors that arise due to the movement of the drilling fluid and fluid end part in the mud pump module body. Then the emitted pulse is forwarded to the EAM, and the results give through two outputs, namely the spectrogram graphic and the acoustic emission sound that enlarged through headphones. The results of this EAM innovation can reduce the NPT in PDSI Rig # 42.3/N1500-E from 34.5 hours to 0 hours, and monitoring can be done remotely up to more than 50 meters no longer on the spot. The application of EAM in drilling rig implies a modification in the maintenance of a mud pump from breakdown to predictive maintenance. It supports the safety aspect considering monitoring which can perform remotely.

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Low-symmetry vacancy-related spin qubit in hexagonal boron nitride

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npj Computational Materials 2024年第1期10卷 1318-1326页

作者： Rohit Babar Gergely Barcza Anton Pershin Hyoju Park Oscar Bulancea Lindvall GergőThiering Örs Legeza Jamie H.Warner Igor A.Abrikosov Adam Gali Viktor Ivády HUN-REN Wigner Research Centre for Physics PO Box 49H-1525 BudapestHungary MTA-ELTE Lendület“Momentum”NewQubit Research Group Pázmány PéterSétány 1/A1117 BudapestHungary Department of Atomic Physics Insitute of PhysicsBudapest University of Technology and EconomicsMűegyetem rakpart 3.H-1111 BudapestHungary Walker Department of Mechanical Engineering and Materials Graduate Program Texas Materials InstituteThe University of Texas at AustinAustinTX78712USA Department of Physics Chemistry and BiologyLinköping UniversitySE-58183 LinköpingSweden Institute for Advanced Study Technical University of MunichLichtenbergstrasse 2a85748 GarchingGermany MTA-WFK Lendület“Momentum”Semiconductor Nanostructures Research Group PO Box 49H-1525 BudapestHungary Department of Physics of Complex Systems Eötvös Loránd UniversityEgyetem tér 1-3H-1053 BudapestHungary

Point defect qubits in semiconductors have demonstrated their outstanding capabilities for high spatial resolution sensing generating broad multidisciplinary *** boron nitride(hBN)hosting point defect qubits have recently opened up new horizons for quantum sensing by implementing sensing *** sensitivity of point defect sensors in hBN is currently limited by the linewidth of the magnetic resonance signal,which is broadened due to strong hyperfine couplings.

关键词： boron defect hexagonal

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The use of remote sensing in mining prospecting in Situbondo, East Java, Indonesia

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AIP Conference Proceedings 2020年第1期2278卷

作者： Januar Fery I Haeruddin Nur Faizin Siti Aminah Fanteri Aji D. S. F. X. Kristianta 1Study Program of Mining Engineering Civil Engineering Department Faculty of Engineering University of Jember Indonesia 2Mechanical EngineeringDepartment Faculty of Engineering University of Jember Indonesia

Mineral resources of a region are development assets and are one of the essential capital of development as well as the source or potential of wealth in the area. To make the right use for the welfare of the community, there is a need for proper identification of types, positions and reserves, excavation, and management. Therefore, to manage the mine deposit, especially industrial minerals, an area needs to be mapped to reveal mining resources concerning the type, size, and position of deposits in a field. The purpose of the study was to determine the potential for the dissemination of mining excavations in Situbondo Regency. The research method used remote sensing with guided techniques based on data in the field and geological maps. Based on remote sensing results, it was found that there were 5 minerals in Situbondo Regency. The excavated materials are sand, limestone, trass, mountain rock, and phosphate.

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Magnetic properties of nanomagnetic material based on BaTiO3 and BiFeO3 with variation of temperatures and times of sintering

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Journal of Physics: Conference Series 2019年第1期1153卷

作者： D. Suastiyanti S. Yatmani M. Wijaya Mechanical Engineering Study Program Institut Teknologi Indonesia Puspiptek-Raya-Street SerpongIndonesia Electrical Engineering Study Program Institut Teknologi Indonesia Puspiptek-Raya-Street Serpong Indonesia Badan Pengkajian dan Penerapan Teknologi (BPPT) Serpong Indonesia

This research uses basic compound of BaTiO3 (BTO) and single phase multiferroic material BiFeO3 (BFO) with weight ratio of BTO: BFO = 2: 1 to produce multiferoic ceramic. The purpose of this research is to know magnetic properties of the ceramic which consists of BFO multiferroic material combined with BTO electrical material. Changes in magnetic properties will affect the quality of multiferroic materials. The process used sol-gel method using temperature and time of calcination of 350°C and 4 hours, then sintered at 700,750 and 800°C for 2, 4 and 6 hours respectively. The sample was characterized by XRD test with diffraction angle of 20°-100° and the machine was made in Phillips type of PW 1835. This test is to know types of phases. To know magnetic properties of sample, it was used Permagraph test. To know particle size, it was used Particle Size Measurement from Nano Instrument of Beckman Coulter DelsaTM. The results show that new phase is formed which is the dominant phase, Barium Bismuth Iron (III) Oxide (BaBiFe2O5) with the largest percentage (98,79%) obtained at sintering process with temperature of 750°C for 6 hours. Increasing the percentage of dominant phases is linier by increasing of magnetic properties of the sample. The highest value of magnetic properties among other coercivity of 247.1 kA / m, remanent of 0.275 Tesla and Saturation of 0.41 Tesla belongs to ceramic with condition of sintering temperature and time of 750°C and 6 hours . The smallest particle size is also obtained under the same conditions equal to the particle size of 54-57 nm.

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Aerodynamic study on wing and tail small UAV without runways

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AIP Conference Proceedings 2016年第1期1737卷

作者： Maria F. Soetanto Randy R. Alfan M. R. Dzaldi 1Aerodynamic Laboratory Aeronautical Engineering Study Program-Mechanical Engineering Politeknik Negeri Bandung Bandung-Indonesia 2Aeronautical Engineering Study Program Politeknik Negeri Bandung Bandung-Indonesia Jl. Gegerkalong Hilir-Ds. Ciwaruga Bandung Indonesia

This paper consists of the design and analysis of the aerodynamics of the profiles of wing and tail of a Small Unmanned Aerial Vehicle (UAV). UAV is a remote-controlled aircraft that can carry cameras, sensors and even weapons on an area that needed aerial photography or aerial video [1]. The aim of this small UAV is for used in situations where manned flight is considered too risky or difficult, such as fire fighting or surveillance, while the term ’small means the design of this UAV has to be relatively small and portable so that peoples are able to carry it during their operations [CASR Part 101.240: it is a UAV which is has a launch mass greater than 100 grams but less than 100 kilograms] [2]. Computational Fluid Dynamic (CFD) method was used to analyze the fluid flow characteristics around the aerofoil’s profiles, such as the lift generation for each angle of attack and longitudinal stability caused by vortex generation on trailing edge. Based on the analysis and calculation process, Clark-Y MOD with aspect ratio, AR = 4.28 and taper ratio, λ = 0.65 was chosen as the wing aerofoil and SD 8020 with AR = 4.8 and λ = 0.5 was chosen as the horizontal tail, while SD 8020 with AR = 1.58 and λ = 0.5 was chosen as the vertical tail. The lift and drag forces generated for wing and tail surfaces can be determined from the Fluent 6.3 simulation. Results showed that until angle of attack of 6 degrees, the formation of flow separation is still going on behind the trailing edge, and the stall condition occurs at 14 degrees angle of attack which is characterized by the occurrence of flow separation at leading edge, with a maximum lift coefficient (Cl) obtained = 1.56. The results of flight tests show that this small UAV has successfully maneuvered to fly, such as take off, some acrobatics when cruising and landing smoothly, which means that the calculation and analysis of aerodynamic aerofoil’s profile used on the wing and tail of the Small UAV were able to be validated.

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Control & Automation, Electronics, Robotics, Internet of Things, and Artificial Intelligence (CERIA), IEEE International Conference on

作者： Michael Christian Ratlan Pardede Henilia Yulita Yuli Kartika Dewi Suryo Wibowo Sunarno Sunarno Management Universitas Bunda Mulia Jakarta Indonesia Master of Management Universitas Bunda Mulia Jakarta Indonesia Master of Communication Studies Universitas Bunda Mulia Jakarta Indonesia Graduate School of Business Universiti Sains Malaysia Penang Malaysia Medical Profession Study Program Krida Wacana Christian University Jakarta Indonesia Mechanical Engineering Universitas Tama Jagakarsa Jakarta Indonesia

ISBN: (数字)9798331511166

ISBN: (纸本)9798331511173

Aside from providing considerable benefits to individuals, AI can also generate anxiety, especially given its sophistication and the level of intimidation that exists in everyday life. The aim of the paper is to assess the usage behavior of AI, using anxiety-related AI configuration as an exogenous variable and gender as a moderating factor. This study was conducted using a quantitative method with empirical approach, utilizing data from 81 participating Indonesian academics. We used SmartPLS 4.0 and SEM-PLS to conduct this research. The study's findings effectively show that anxiety-related AI configurations significantly influence AI usage behavior in negative interactions (P value $=\mathbf{0. 024}$ ; original sample $=-0.51$ ). This study also explained that as worry levels increase, women's efficiency decreases, resulting in a lower aptitude for AI use when compared to men. As their anxiety levels increase, more women consider using artificial intelligence. This study benefits both scholars and the industry by deepening our understanding of behavioral attitudes towards AI use, with a particular focus on gender-based AI users.

关键词： Industries Correlation Automation Anxiety disorders Internet of Things Artificial intelligence Robots

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The potential use of Indonesian glutinous rice flour as nanoparticles organic filler for dental impression materials

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： V Takarini L A T W Asri R Suratman B K Hadi Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia Dental Materials and Technology Department Faculty of Dentistry Universitas Padjadjaran Sekeloa Selatan 1 Bandung 40132 Indonesia Aerospace Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Ganesha 10 Bandung 40132 Indonesia

Indonesia as a third largest rice producer has glutinous rice as one of its natural resources, which can be used as the advantage in organic fillers production. Organic and inorganic fillers are commonly added to reinforce the mechanical properties of the polymer in impression materials. Organic fillers made from glutinous rice flour can be produced due to its high amylopectin content and unique characteristics of morphological and structural of the source plant. Moreover, it is abundant in production, low cost, non-toxic and biodegradable. However, this type of filler is not common in dental area, especially in impression materials. This study aims to exercise the probability of the use of organic fillers made from Indonesian glutinous rice as filler component of the viscosity the dental impression materials. Nano-size, morphology, and amount of glutinous rice organic filler shall affect the consistency of viscosity, which will be provided as light, medium, heavy body and putty consistency. The study can be used as a reference in the future research of Indonesian glutinous rice development for organic nanofillers production that could be used for dental impression materials reinforcement towards better mechanical properties.

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Preliminary study on Acoustical Characteristics of Sago Midrib Composite

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IOP Conference Series: Materials Science and engineering 2019年第1期619卷

作者： Asniawaty Kusno Sherly Asriani Kusno Kamil Nurul Jamala Department of Architecture Faculty of Engineering Hasanuddin University Indonesia Study Program of Architecture Engineering Faculty Khairun University Indonesia Mechanical Engineering Department Engineering Faculty Universitas Muslim Indonesia Indonesia

This research is a preliminary study on the use of sago midrib as an acoustic material. This study aims to determine the sago as acoustic material by measuring the absorption coefficient using (impedance tube method) of 100 Hz-1.6 KHz frequencies. The results of measurement were analyzed and compared with common acoustic material available on market as reference. From the measurement of the sago midrib composite, absorption coefficient has fluctuated from low to high frequencies as the absorption coefficient of reference material is found to be more stable.

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