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Development of natural fiber tensile test apparatus using cantilever structure loading system

IOP Conference Series: Materials Science and engineering 2020年第1期801卷

作者： Abubakar H Homma H Ambarita Doctoral Program in Mechanical Engineering Department Faculty of Engineering Universitas Sumatera Utara Medan 20155 Indonesia Visiting Professor in Mechanical Engineering Department Faculty of Engineering Universitas Sumatera Utara Medan 20155 Indonesia Mechanical Engineering Department Faculty of Engineering Universitas Sumatera Utara Medan 20155

Measurement of the mechanical properties of natural fiber is an important role in quality control. One of the most important mechanical properties of fiber is its tensile strength. To carry out tensile test fiber required tensile test apparatus. The tensile test apparatus used today is a foreign-made commercial tensile test imported at an exorbitant price. These conditions cause obstacles in the development of basic natural fiber technology in Indonesia. The purpose of this research is to design a natural fiber tensile test apparatus which is cheap and easy to operate. The result of this research is prototype of fiber tensile test which has been successfully tested with: 5N loading capacity, calibration curve accuracy: N = 1.052 V and loading rate 0.014 N/s. The result of tensile test to one natural fiber that used abaca fiber in range 100 MPa - 900 MPa and the data of tensile test results in existing literatures then there is conformity with the value of tensile strength. The results of this study are expected provide benefits for researchers, academics and industry in supporting the development of Indonesia natural fiber industry as well as enhancing competitiveness at international level.

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An effect of humid climate on micro structure and chemical component of natural composite (Boehmeria nivea-Albizia falcata) based wind turbine blade 2

An effect of humid climate on micro structure and chemical c...

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2nd International Conference on Energy, Environmental and Information System, ICENIS 2017

作者： Sudarsono, S. Purwanto, P. Sudarsono, Johny W. Department of Mechanical Engineering Institut Sains Dan Teknoogi AKPRIND Yogyakarta Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Diponegoro Indonesia Doctoral Program of Environmental Science School of Postgraduate Studies Universitas Diponogero Semarang Indonesia Depart. of Material and Metallurgy Faculty of Engineering Universitas Indonesia Jakarta Indonesia

In this work, wind turbine blade NACA 4415 is fabricated from natural composite of Boehmeria nivea and Albizia falcate. The composite fabrication method used is hand lay up method. The aim of the work is to investigate an effect of humid climate of coastal area on micro structure and chemical composition of composite material of the blade. The wind turbine is tested at Pantai Baru, Bantul, Yogyakarta for 5.5 months. The micro structure scanning is performed with Scanning Electron Microscope (SEM) and material component is measured with Energy Dispersive X-ray spectrometer (EDS). The samples are tested before and after the use within 5.5 month at the location. The results show that composite material inexperienced interface degradation and insignificant change of micro structure. From EDS test, it is observed that Na filtration reduces C and increases O in composite material after 5.5 months. © 2018 The Authors, published by EDP Sciences.

关键词： Microstructure

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Motivation increase of mathematics students in engineering – A proposal from Game Based Learning

Motivation increase of mathematics students in Engineering ...

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International Symposium on engineering Accreditation (ICACIT)

作者： Sergio A. Zabala-Vargas Lewis H. García-Mora Dayan A. Ardila-Segovia Bárbara L. de Benito-Crosetti Faculty of Telecommunications Engineering Universidad Santo Tomás Bucaramanga Colombia Curriculum Development Unit and Teacher Training Universidad Santo Tomás Bucaramanga Colombia Doctoral Program in Educational Technology Universidad de las Islas Baleares Palma de Mallorca España

ISBN: (数字)9781728135670

ISBN: (纸本)9781728135687

Training and capacity building for students in engineering programs, including developing competencies and skills in mathematics, have been well-established in literature. There is less known about lowering rates of desertion (understood as the non-completion of an academic program). While it is generally agreed that there are multiple causes (individual, institutional, and state), several authors suggest that low academic results and low motivation in an educational process are important causes. In the case of Santo Tomás University, the site of study for this research project, the desertion index in engineering programs is close to 45%. The course with the highest failure rates is introductory mathematics (offered in the first year). Given this context, this research project proposed innovative pedagogical strategies and mediations , targeting the motivation indexes of university-aged students enrolled in mathematics courses. Game-based learning and mixed methods were employed to design a set of two didactic strategies: (A) Kahoot Online Testing Tool, and (B) Online Crossword. The target population was represented by 20 students enrolled in a differential calculus course, as part of the first-year engineering program. For benchmarking purposes, the participants were given a diagnostic calculus test. Next, an adaptation of Instructional Material Motivation Survey was applied, which allowed me to measure the dimensions of attention, confidence, satisfaction, and relevance . The results demonstrated that the pedagogical innovation positively impacted student motivation. The most significant results include the importance of planning rigorous learning activities, incorporating problems from the real student environment, and the importance of offering immediate feedback.

关键词： Motivation ARCS Model Game Based Learning Maths learning engineering Students Desertion Abandonment engineering students engineering calculating program mathematics motivation Students Hunting Game theory failure rates Decreased motivation Learning research project Education

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5G Channel Model for 28 GHz frequency in Palembang

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Journal of Physics: Conference Series 2020年第1期1500卷

作者： B Alfaresi Z Nawawi R F Malik K Anwar Electrical Engineering Universitas Muhammadiyah Palembang Indonesia Doctoral Program of Engineering Science Universitas Sriwijaya Indonesia Electrical Engineering Universitas Sriwijaya Indonesia Computer Science Department Universitas Sriwijaya Indonesia Center for Advanced Wireless Technologies (AdWiTech) Telkom University Indonesia

Next generation wireless technology require a wide frequency band. Current technology use a frequency of below 3 GHz which cannot provide a wide frequency band due to quite dense frequency utilization. The mm-Wave frequency guarantee to provide a wide band frequency band. The use of mm-Wave frequency will be influenced by climate factors. The characteristics of a place will cause a different channel model. Channel Model is useful for minimizes errors and maximizes information transmission or bitrate in communication model. The Channel Model will be represented as a PDP (Power Delay Profile). Channel model performance uses the Outage performance parameter in Shannon Theorem Implementation. Validation results using the CP-OFDM system with 5G BPSK. The parameters used for validation are FER and BER. In this paper, channel models will be analysed based on the characteristic of Palembang area as a reference channel model in Outer of Indonesia. Hopefully, it can be used as a reference for the development 5G wireless system.

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Landfill mining dominated by organic solid waste: a review on its benefits, potential and challenges to recovery landfills in growing cities in Indonesia

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IOP Conference Series: Materials Science and engineering 2020年第1期845卷

作者： Zaulfikar Sudarno Budiyono Doctoral Program Environmental Sciences of Diponegoro University Semarang Indonesia Industrial Engineering Department of Teuku Umar University Meulaboh West Aceh Indonesia Environmental Engineering Department of Diponegoro University Semarang Indonesia Chemical Engineering Department of Diponegoro University Semarang Indonesia

One of serious impacts of increasing human population in cities is the availability of land, strategic land in particular becomes rare and as a result, its value increases rapidly. Another impact is the amount of solid waste produced which also continues to increase sharply. Although the perception and knowledge of the community regarding solid waste is improving, it does not necessarily change their paradigm, mindsets and behaviors in minimizing solid waste, the landfill is still the final solution to solid waste. In general, the carrying capacity and supporting capacity of landfills in the cities have reached the maximum limit and must be closed immediately. Initially the locations of the landfills were far from city centres, but now generally they are in densely populated urban areas. Procurement of new landfill is constrained by regulations, costs, technical and social issues. NIMBY syndrome (not in my back yard) is the culmination of public rejection, and has even become a vertical conflict between the community and the government. The study of landfill mining, particularly the study of benefits, potential and challenges in choosing landfill mining, which is dominated by organic solid waste, is an interesting study to explore. The use of compost landfill mining as an organic fertilizer for plants, or as biocover is a logical argument for recover or extend the service life of old landfill.

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Pyrolysis study of coconut leaf's biomass using thermogravimetric analysis

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IOP Conference Series: Materials Science and engineering 2019年第1期539卷

作者： I M Rajendra I N S Winaya A Ghurri I K G Wirawan Study Program of Doctoral Engineering Sciences Faculty of Engineering University of Udayana Mechanical Engineering Department Bali State Polytechnic Study Program of Mechanical Engineering Faculty of Engineering University of Udayana

Coconut leaf is one of the most potential biomass to be converted into bio-oil through pyrolysis process and the availability in Indonesia is abundance. The mechanism of decomposition of coconut leaf into bio-oil productions requires further research because of the complexity of pyrolysis and differences in biomass composition. Therefore, the design, optimization and modeling of pyrolysis processes is strongly influenced by biomass characteristics. The purpose of this study was to find the characteristic differences in pyrolysis behavior of the three main parts of coconut leaf based on its constituent parts; leaflets, midrib and whole leaf. Moisture is removed by drying the sample in an electric oven at 110°C for 24 hours. Characteristics were tested using Cellulose Analysis, Ultimate Analysis, and Heat Value, whereas pyrolysis behavior used Thermogravimetric Analyzer (TGA). The results show that leaflets, midrib and whole leaf exhibit different pyrolysis behavior. In terms of considering flow process of separation, the whole leaf becomes an option as a fuel for further pyrolysis processes. The maximum temperature that as a reference in the pyrolysis process of coconut leaves is 500°C with temperature rate of 20°C/min and the process lasts as long for 130 minutes.

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Off-site domestic wastewater management system in Banda Aceh, Indonesia: the problems and future solutions concept

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IOP Conference Series: Earth and Environmental Science 2021年第1期644卷

作者： J Harahap T Gunawan S Suparayogi M Widyastuti Department of Environmental Engineering Faculty of Science and Technology Islamic State University of Ar-Raniry Banda Aceh Indonesia Student of Doctoral Program in Environmental Science School of Postgraduate Universitas Gadjah Mada Indonesia Department of Cartography and Remote Sensing Faculty of Geography Universitas Gadjah Mada Indonesia Department of Environmental Geography Faculty of Geography Universitas Gadjah Mada Indonesia

Currently, Banda Aceh has been dealing with several problems related to pollution caused by domestic wastewater. According to previous studies, shallow groundwater and surface water in Banda Aceh have been contaminated by domestic wastewater produced by the community. The settlement scale off-site system with communal-WWTP operating in several villages has not function optimally in treating domestic wastewater. The problem also caused by service coverage which is still very small (only 2.12% of the total population). Therefore, it is require an acceleration of service improvement, by developing urban scale off-site system with centralized-WWTP and a wider pipe line network system. Moreover, further investigations are needed to develop the concept of planning as a preliminary design in the management of urban scale off-site system. This paper aims to develop a concept of domestic wastewater management using an urban scale off-site system that considers environmental characteristics in Banda Aceh as an alternative to mitigate the occurrence of water body pollution by domestic wastewater.

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Strength and Durability of Six Fast-Growing Timber Against Marine Biota as an Alternative to Hull Materials

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Journal of Physics: Conference Series 2020年第1期1655卷

作者： Fakhri Imam Suprayogi Yusni Ikhwan Siregar Sujianto Students of the Doctoral Program in Environmental Sciences University of Riau Departement of Civil Engineering Engineering Faculty University of Riau Department of Marine Sciences Faculty of Fisheries University of Riau Department of Commerce Administration Faculty of Social and Political Sciences University of Riau

Ship hulls are vulnerable to attack by marine animals (barnacles and sea worms). The current scarcity of natural forest wood supplies has a negative impact on the fulfillment of good quality wood raw materials for wooden hull, especially types of Meranti batu (Shorea platyclados). The research aims to test the strength and durability of six fast-growing wood species as an alternative material for ship *** method used is a laboratory test and field *** strength test based on SNI ISO 16978-2010, wood durability test based on SNI 01-7207-2006. The field test was carried out by submerging the specimens for six months in sea water, Kubu District, Rokan Hilir, Riau Province, Indonesia. Six types of wood tested were: Acacia (Acacia Mangium), Geronggang (Cratoxylon arborencens), Trembesi (Samanea saman), Eucalyptus (Eucalyptus), Mahang (Macaranga gigantea ***), and Jabon (Anthocephalus cadamba (Miq)). Sea water immersion test results obtained that the wood Jabon, Acacia Mangium, Ekaliptus, and Geronggang not significantly different. The results of research on the flexural strength, Acacia Mangium wood and eucalyptus have strength equivalent to Meranti batu wood, so that it has the potential as an alternative material for hull material.

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Current status of domestic wastewater management system in Banda Aceh, Indonesia

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IOP Conference Series: Earth and Environmental Science 2021年第1期739卷

作者： J Harahap T Gunawan S Suprayogi M Widyastuti Student of Doctoral Program in Environmental Science School of Postgraduate Gadjah Mada University Indonesia Department of Environmental Engineering Faculty of Science and Technology Islamic State University of Ar-Raniry Banda Aceh Indonesia Department of Cartography and Remote Sensing Faculty of Geography Gadjah Mada University Indonesia Department of Environmental Geography Faculty of Geography Gadjah Mada University Indonesia

Almost all cities in Indonesia have not had sewer systems that are qualified for the excellent standard. As a province capital, Banda Aceh has also been facing several domestic wastewater management problems. Based on several previous reports, the water body in Banda Aceh has been contaminated by domestic wastewater pollution. Therefore, serious attention is needed to overcome the problem, such as analysis, investigations, and concepts. This paper aimed to review domestic wastewater management in Banda Aceh and describe the concepts that can be used to solve those problems. The analytical methods used in this study were spatial and descriptive analysis. This study's result was the development of concepts of domestic wastewater management system for preliminary planning in Banda Aceh, which has been considered to be needed as the alternative solution.

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Tourism vulnerability management to support local wisdom conservation in the current agriculture practices (Case: Agricultural tourism area in Ngawi Regency, East Java, Indonesia)

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IOP Conference Series: Earth and Environmental Science 2021年第1期824卷

作者： B Pujiasmanto I Aliyah N Miladan R Sugiarti Margana D Setyaningrum Department of Agrotechnology Faculty of Agriculture Universitas Sebelas Maret Surakarta Indonesia Department of Regional and Urban Planning Engineering Faculty Universitas Sebelas Maret Surakarta Indonesia Research and Development Centre of Tourism and Culture Research and Community Service Institute Universitas Sebelas Maret Surakarta Indonesia Doctoral Program of Agricultural Science Faculty of Agriculture Universitas Sebelas Maret Surakarta Indonesia

Climate change can cause an increase in the earth's surface temperature and atmospheric CO2. This has an impact on the tourism area based on local agricultural wisdom. The research aims to analyze the level of tourism vulnerability management and formulate tourism vulnerability management strategies to support local wisdom preservation in current farming practices. The method used is mapping, field observations, and interviews with two approaches, namely quantitative content analysis and qualitative content analysis. The results showed that the farming community was only profit-oriented without paying attention to balancing and preserving the natural environment. Most farmers want all agricultural processes to be done instantly or quickly, with higher yields. However, they leave local wisdom values and socio-cultural contexts in managing the rice field environment. One of the components of local wisdom that can still be maintained is the cropping pattern primarily found in the highlands that can still be found. To manage the vulnerability of tourism to support the preservation of local wisdom in current agricultural practices.

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