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Supplier selection and order allocation using TOPSIS and linear programming method at Pt. Sekarlima Surakarta

AIP Conference Proceedings 2019年第1期2097卷

作者： Yunus Nazar Ridya Amerani Pra Lovian Dwi Cahyadi Raharjo Cucuk Nur Rosyidi 1Master Program of Industrial Engineering Universitas Sebelas Maret JL. Ir. Sutami 36A Surakarta 57126 Indonesia 2Weaving Engineering AK Tekstil Solo JL. Ki Hajar Dewantara Surakarta 57126 Indonesia 3Spinning Engineering AK Tekstil Solo JL. Ki Hajar Dewantara Surakarta 57126 Indonesia 4Department of Mechanical Engineering Universitas Soerjo JL. Cepu KM 3 Kotak Pos 15 Ngawi 63251 Indonesia

PT. Sekarlima is a woven fabrics manufacturing company. One of the raw materials for fabric weaving process is yarn. To fulfill the demand for woven fabric the company faces some problems in supplier selection and the allocation of raw materials. Supplier selection and the allocation are essential to support the smoothness of the production process. To produce a good quality product the company needs a good planning system and integrated implementation, in accordance with production activities in which it cannot be separated from raw materials. Supplier selection is important in this activity, as it will determine the cost of production. The aims of this research are to determine a set of appropriatesuppliers of yarn using the TOPSIS method and allocate theyarn to selected suppliers using Linear programming model. TOPSIS is one of the multi-criteria decision methods in which the selected alternative determined by the closest distance of the ideal solution and has the furthest distance from the non-ideal solution using the Euclidean distance (the distance between two points) to determine the relative distance of the alternative. From the results of the analysis, there are 4 suppliers are selected, namely TYF, AGT, DLS, and APC. Five criteria are used in the supplier selection, namely quality, price, delivery, flexibility, and responsiveness. TOPSIS resulted in the order of rank of each supplier TYF, AGT, DLS, and APC is 0.52, 0.48, 0.48, and 0.23 respectively. The order allocation from a linear programming model for each supplier is 1088. 64 kg, 870.91 kg, 526.18 kg, and 54.43 kg.

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The effect of ZnO addition against crystallinity and water absorption capacity of biofoam based cassava starch reinforced bacterial cellulose

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AIP Conference Proceedings 2019年第1期2120卷

作者： Moh. Astono Basuki Heru Suryanto Aisyah Larasati Poppy Puspitasari Mujiono 1Master Program of Mechanical Engineering Graduate School Universitas Negeri Malang Jl. Semarang 5 Malang East Java Indonesia 2Centre of Advanced Materials for Renewable Energy Universitas Negeri Malang. Jl. Semarang 5 Malang East Java Indonesia 3Department of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang. Jl. Semarang 5 Malang East Java Indonesia 4Department of Industrial Technology Universitas Negeri Malang. Jl. Semarang 5 Malang East Java Indonesia

Polystyrene is one type of plastic that is hard to be degraded, because of that, it requires an alternative to reduce polystyrene waste through biofoam. Biofoam which is made of starch is reinforced with bacterial cellulose that has high hydrophilic properties. This study aims to know the effect of ZnO addition to crystallinity and water absorption capacity of biofoam based cassava starch reinforced bacterial cellulose. The method used experimental design. Synthesis of biofoam was conducted using baking process method with varied the ZnO content in the biofoam were 0%, 3%, 6%, 9%. The resulted samples were analyzed by X-ray diffraction and water absorption test to determine the effect of ZnO concentration. The results showed that the addition of ZnO variation into biofoam caused the change in diffraction position and intensity. The control variation (0% ZnO) had the highest diffraction peak at the position of 20.88°2θ with an intensity of 68.65 counts, crystallite size of 20.795 nm. After adding ZnO variation of 3%, 6%, 9%, diffraction position and intensity change to be 36.31°2θ and 276.29 counts, 36.26°2θ and 558.81 counts, and 36.31°2θ and 725.78 counts, respectively. The addition of ZnO into biofoam composite decreased water absorption up to 33% compared than the control sample, and the lowest optimum absorption resulted in ZnO concentration of 9% with water absorption value of 0.164 (gH2O/g).

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Author Correction: Brain clocks capture diversity and disparities in aging and dementia across geographically diverse populations

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Nature medicine 2024年第12期30卷 3779页

作者： Sebastian Moguilner Sandra Baez Hernan Hernandez Joaquín Migeot Agustina Legaz Raul Gonzalez-Gomez Francesca R Farina Pavel Prado Jhosmary Cuadros Enzo Tagliazucchi Florencia Altschuler Marcelo Adrián Maito María E Godoy Josephine Cruzat Pedro A Valdes-Sosa Francisco Lopera John Fredy Ochoa-Gómez Alfredis Gonzalez Hernandez Jasmin Bonilla-Santos Rodrigo A Gonzalez-Montealegre Renato Anghinah Luís E d'Almeida Manfrinati Sol Fittipaldi Vicente Medel Daniela Olivares Görsev G Yener Javier Escudero Claudio Babiloni Robert Whelan Bahar Güntekin Harun Yırıkoğulları Hernando Santamaria-Garcia Alberto Fernández Lucas David Huepe Gaetano Di Caterina Marcio Soto-Añari Agustina Birba Agustin Sainz-Ballesteros Carlos Coronel-Oliveros Amanuel Yigezu Eduar Herrera Daniel Abasolo Kerry Kilborn Nicolás Rubido Ruaridh A Clark Ruben Herzog Deniz Yerlikaya Kun Hu Mario A Parra Pablo Reyes Adolfo M García Diana L Matallana José Alberto Avila-Funes Andrea Slachevsky María I Behrens Nilton Custodio Juan F Cardona Pablo Barttfeld Ignacio L Brusco Martín A Bruno Ana L Sosa Ortiz Stefanie D Pina-Escudero Leonel T Takada Elisa Resende Katherine L Possin Maira Okada de Oliveira Alejandro Lopez-Valdes Brian Lawlor Ian H Robertson Kenneth S Kosik Claudia Duran-Aniotz Victor Valcour Jennifer S Yokoyama Bruce Miller Agustin Ibanez Latin American Brain Health Institute Universidad Adolfo Ibañez Santiago de Chile Chile. Cognitive Neuroscience Center Universidad de San Andrés Buenos Aires Argentina. Department of Neurology Massachusetts General Hospital and Harvard Medical School Boston MA USA. Universidad de los Andes Bogota Colombia. Global Brain Health Institute (GBHI) University of California San Francisco CA USA. Global Brain Health Institute (GBHI) Trinity College Dublin Dublin Ireland. The University of California Santa Barbara (UCSB) Santa Barbara CA USA. Escuela de Fonoaudiología Universidad San Sebastián Santiago de Chile Chile. Grupo de Bioingeniería Decanato de Investigación Universidad Nacional Experimental del Táchira San Cristóbal Venezuela. Advanced Center for Electrical and Electronic Engineering Universidad Técnica Federico Santa María Valparaíso Chile. University of Buenos Aires Buenos Aires Argentina. The Clinical Hospital of Chengdu Brain Sciences Institute University of Electronic Sciences and Technology of China Chengdu China. Technology of China Chengdu China. Cuban Neuroscience Center La Habana Cuba. Grupo de Neurociencias de Antioquia (GNA) University of Antioquia Medellín Colombia. Department of Psychology Master Program of Clinical Neuropsychology Universidad Surcolombiana Neiva Neiva Colombia. Department of Psychology Universidad Cooperativa de Colombia Arauca Colombia. Neurocognition and Psychophysiology Laboratory Universidad Surcolombiana Neiva Colombia. Reference Center of Behavioural Disturbances and Dementia School of Medicine University of Sao Paulo Sao Paulo Brazil. Traumatic Brain Injury Cognitive Rehabilitation Out-Patient Center University of Sao Paulo Sao Paulo Brazil. Center for Social and Cognitive Neuroscience School of Psychology Universidad Adolfo Ibáñez Santiago Chile. Neuropsychology and Clinical Neuroscience Laboratory (LANNEC) Physiopathology Program-Institute of Biomedical Sciences (ICBM) Neuroscience and East Neuroscience Dep

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Application of free surface synthetic schlieren method in determining surface tension from a light floating object

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Journal of Physics: Conference Series 2019年第1期1380卷

作者： C Pathommapas S Yapo E Seesomboon N Pussadee Master's Degree Program in Teaching Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Science Department Udomdarunee School Sukhothai 52000 Thailand Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai 50200 Thailand Plasma and Beam Physics Research Facility Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Thailand Center of Excellence in physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand

Free surface synthetic schlieren (FS-SS) is a liquid surface topography visualization technique relying on apparent dot pattern displacement due to liquid surface deformation. It has gained attention in the fluid visualization field due to its relatively simple and inexpensive setup. One of the most powerful features of the FS-SS technique is the 3D topography of deformed liquid surface, in which submillimeter scale changes can be readily observed in great detail. The visualization of liquid meniscus at the solid interface is proposed in this study to calculate surface tension by equating the surface tension force with weight of light, floating object with circular geometry. It was found that surface tensions of liquids are much greater than anticipated, suggesting that the effect of buoyant force of displaced liquid due to deformed interface cannot be neglected. When the buoyant force is included, the calculated surface tension of liquids are within 10% of the reference values.

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Application of nanocatalyst iron oxide (Fe2O3) to reduce exhaust emissions (CO and HC)

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IOP Conference Series: Materials Science and engineering 2018年第1期432卷

作者： P Puspitasari C Yazirin L A Bachtiar J W Dika SM S N S Zaharis Mechanical Engineering Department Engineering Faculty Malang State University Semarang street 5 Malang East Java Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang street 5 Malang East Java Indonesia Master Program of Mechanical Engineering Engineering Faculty Malang State University Semarang street 5 Malang East Java Indonesia Bachelor Program Mechanical Engineering Department Malang State University Semarang street 5 Malang East Java Indonesia Industrial Chemical Technology Programme Faculty of Science and Technology Universiti Sains Islam Malaysia Bandar Baru Nilai 71800 Nilai Negeri Sembilan

Fe2O3 has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Fe2O3 is a chemical mixture that can be applied as a catalyst to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases The growth of motor vehicles results in air pollution and an increase in exhaust emissions consisting of 70.50% CO and 18.34% HC. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88, RON 90, RON 92, and RON 98. The results showed that the application of Fe2O3 as a catalyst could reduce the level of CO significantly in RON 88, i.e. 91.43% CO, and the level of HC in RON 88 and RON 92, i.e. 53.27% and 91.07% HC respectively.

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Nanocatalyst manganese oxide (MnO) for exhaust emissions (CO and HC) reduction

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IOP Conference Series: Materials Science and engineering 2018年第1期432卷

作者： P Puspitasari M I N Sasongko G A Kurniawan Andoko D I Tsamroh Mechanical Engineering Department Engineering Faculty Malang State University Semarang Street 5 Malang East Java Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang Street 5 Malang East Java Indonesia Master Program Postgraduate Program Malang State University Semarang Street 5 Malang East Java Indonesia

The growing number of motor vehicles, particularly the exhaust gas as a result of incomplete combustion of fuels, has a very adverse impact on the environment. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. MnO is a chemical mixture that can be applied to a catalytic converter to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88 and RON 92. The results showed that the application of MnO as a catalyst could reduce the level of CO significantly in RON 88, i.e. 24.36%, and the level of HC in RON 88 and RON 92, i.e. 82.08% and 38.14 % respectively.

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Study of cultivation and growth rate kinetic for mixed cultures of local microalgae as third generation (G-3) bioethanol feedstock in thin layer photobioreactor

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Journal of Physics: Conference Series 2018年第1期1022卷

作者： Wahyu Prihastuti Yuarrina Yano Surya Pradana Arief Budiman Akmal Irfan Majid Indarto Eko Agus Suyono Master Program of Systems Engineering Universitas Gadjah Mada Jalan Teknika Utara 3 Yogyakarta Indonesia Chemical Engineering Department Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta Indonesia Center for Energy Studies Universitas Gadjah Mada Sekip K1a Yogyakarta Indonesia Mechanical and Industrial Engineering Department Universitas Gadjah Mada Jalan Grafika No. 2 Yogyakarta Indonesia Faculty of Biology Universitas Gadjah Mada Jalan Teknika Selatan Yogyakarta Indonesia

The increasing use of fossil fuels causes the depletion in supply and contributes to climate change by GHG emissions into the atmosphere. Microalgae indicate as renewable and sustainable energy sources as they have a high potential for producing large amounts of biomass for third-generation biofuels (bioethanol and biodiesel) feedstock. However, there are several parameters which should be considered for microalgae cultivation, such as environmental conditions, medium composition and microalgae species. The aim of this research was to study cultivation of mixed microalgae cultures (Glagah consortium and Arthrospira maxima) in a thin layer photobioreactor. Farmpion medium, Bold's Basal Medium (BBM) and Thoriq Eko Arief (TEA) medium were investigated as cultivation medium for bioethanol feedstock for 7 days. The results showed that the highest dry weight concentration of microalgae was in Farmpion medium (0.35 mg/ml) and the highest carbohydrate concentration of microalgae was in BBM (0.14 mg/ml). Thus, the optimum medium of microalgae cultivation for bioethanol feedstock was BBM because of the highest carbohydrate-dry weight ratio (0.88). In addition, mathematical approach by using Contois model was used to find out the growth rate of microalgae cultivation in each medium.

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Surface Water Wave Topography Construction using Free Surface Synthetic Schlieren Method for Demonstration of Ripple Tank Wave Phenomena

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Journal of Physics: Conference Series 2018年第1期1144卷

作者： S Yapo E Seesomboon N Chattrapiban N Pussadee Master's Degree Program in Teaching Physics Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Department of Mechanical Engineering Faculty of Engineering Chiang Mai University Chiang Mai 50200 Thailand Department of Physics and Materials Science Chiang Mai University Chiang Mai 50200 Thailand Thailand Center of Excellence in Physics Commission on Higher Education 328 Si Ayutthaya Road Bangkok 10400 Thailand Research Center in Physics and Astronomy Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand

The ripple tank is a popular water wave phenomena demonstration tool for secondary school students. The projected wave images are observed in bright - dark patterns on a screen. This tool, however, falls short in presenting the amplitude of the waves which is another important parameter in explaining the wave phenomena. The free surface synthetic schlieren (FS-SS) method presents an immense technical tool for solving this problem. FS-SS is an optical method based on light refraction in determining the surface gradient field from the motion of a random dot pattern when the water surface is perturbed. The surface height of the wave is constructed using the inverse gradient operation on the displacement gradient field of the random dot pattern. In this work, Wave propagation, reflection, diffraction, and interference pattern surface construction were performed to visualize wave phenomena in 3D.

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Phase identification and morphology study of hematite (Fe2O3) with sintering time varitions

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AIP Conference Proceedings 2017年第1期1887卷

作者： Cepi Yazirin Poppy Puspitasari Muhammad Ilman Nur Sasongko Dewi Izzatus Tsamroh Puput Risdanareni 3Master Program Postgraduate Program in Mechanical Engineering State University of Malang East Java Indonesia 1Mechanical Engineering Department Engineering Faculty State University of Malang Malang East Java Indonesia 2Center of Advanced Materials State University of Malang East Java Indonesia 4Civil Engineering Department Engineering Faculty State University of Malang East Java Indonesia

Iron oxide has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Iron oxide (Fe2O3) has potential applications in catalytic reactions in electronic devices such as semiconductors, paint formulations, and lithium rechargeable batteries. Fe2O3 can be synthesized through the process of stirring, decomposition of organic iron, sol-gel, combustion, and evaporating solvents. Most of the methods used involve several steps and take a long time. The aim of this research was to investigate the phase and morphology characterization of iron oxide (Fe2O3) powder with solvent ethylene glycol after being sintered for 1 hour, 2 hours and 3 hours. The characterization tools utilized were XRD, SEM-EDX, and FTIR. The results of XRD analysis showed that the Fe2O3 sintered for 1 hour had the smallest crystallite size with a diameter of 21.05 nm. In the XRD test, the beam of X-ray was shot directly at the grain being tested. The results of SEM analysis showed thatthe Fe2O3 sintered for 1 hour produced the best result due to its crystallite size of 12.36 nm and hada shape of homogeneous nanosphere; the duration of sintering indeed had a great influence on the grain size of iron oxide (Fe2O3). In addition, the results of the elemental composition analysis indicate that the longer the sintering process, the higher the concentration of O but the lower the Fe.

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Development of one hand drive wheelchair system: Design and Experiment of the active front wheel system

Development of one hand drive wheelchair system: Design and ...

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IEEE Symposium on Computational Intelligence and Bioinformatics and Computational Biology (CIBCB)

作者： Daisuke Hayashi Sho Yokota Daisuke Chugo Hiroshi Hashimoto Dept. of Mechanical Engineering Toyo University Kawagoe Saitama Japan School of Science and Technology Kwansei Gakuuin University Sanda Hyogo Japan Master Program of Innovation for Design and Engineering Advanced Institute of Industrial Tech. Tokyo Japan

ISBN: (纸本)9781509000128

The purpose of this study is to propose the wheelchair system enabling hemiplegic users to steer the wheelchair by one hand drive. This system consists of two parts: extraction of user's control intention from the single hand rim and the front wheel system with active steering. In particular, this paper focuses on the feasibility verification of this system and to propose the front wheel system. For this verification, the rigid body dynamics simulation was conducted. The result showed that the orientation of the wheelchair could be changed by driving the single driving wheel and by steering the front wheel. The required steering torque for front wheel was derived to design the front wheel system. After that, the prototype was proposed. Then the basic experiment was conducted to verify the efficiency of the system. The result of the experiment showed that the orientation of the wheelchair could be changed by steering front wheel and by one hand drive.

关键词： Wheels Wheelchairs Torque Friction Force Grounding Actuators

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