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Ripeness stage characterization of coffee fruits ( coffea arabica L. var. Castillo ) applying chromaticity maps obtained from digital images

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Materials Today: Proceedings 2021年 44卷 1271-1278页

作者： Alexander Rincon-Jimenez Hector A. Tinoco Jaime Buitrago-Osorio Olga Ocampo Lina V. Berrio Jose L. Rodriguez-Sotelo Carlos Arizmendi Experimental and Computational Mechanics Laboratory Universidad Autónoma de Manizales Edificio Fundadores C.P. 170001 Manizales-Caldas Colombia Doctoral Program Universidad Autónoma de Manizales Edificio Fundadores C.P. 170001 Manizales-Caldas Colombia Institute of Physics of Materials Academy of Sciences of the Czech Republic Žižkova 22 616 62 Brno Czech Republic Central European Institute of Technology (CEITEC) Brno University of Technology Purkyňova 123 612 00 Brno Czech Republic Departament of Economy and Administration Universidad Autónoma de Manizales. Edificio Fundadores C.P. 170001 Manizales-Caldas Colombia Mechatronics Engineering Program Universidad Autonoma de Bucaramanga Bucaramanga-Santander Colombia

The harvesting is one of the most expensive stages during Colombian coffee production since the selectivity of ripe fruits (from the trees) is carried manually nowadays. However, the scarcity of workforce has become a new challenge for developing technologies that can be used in situations that traditional mechanized harvesters cannot be implemented. The classification of coffee fruits through the ripeness could help create selective harvesting methods from the different engineering fields (robotic, artificial vision, vibratory systems, etc.). This study describes a methodology to characterize the coffee fruit ripeness (Coffea arabica var. Castillo) using color maps obtained from digital image processing and colorimetry. Ninety-two samples were measured, and for each sample, a digital image was processed to extract the most representative color with an algorithm (RGB space), and parallel to this, the chromaticity was measured with a colorimeter (CIELab space). Both color spaces were related through linear transformations computed from the data. Results show that the ripeness classification is well defined in both color spaces; however, RGB space was divided into four ripening since the ripeness timeline was linearly represented. Through the transformations, the image data were contrasted with those measured with the colorimeter, which demonstrated that it could be converted in a colorimeter under certain specific conditions.

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Determination of feasible sites for wind farm using WAsP in Uttaradit, Thailand

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IOP Conference Series: Materials Science and engineering 2021年第1期1163卷

作者： T Khan J Taweekun T Theppaya Energy Technology Program Faculty of Engineering Prince of Songkla University Hat Yai Songkhla 90112 Thailand. Department of Mechanical and Mechatronics Engineering Faculty of Engineering Prince of Songkla University Hat Yai Songkhla 90112 Thailand.

Electricity production from the wind plays the potential role to reduce conventional way of electricity generation to reduce the negative impacts on the environment. In this study the data is collected from Uttaradit, the northern province of Thailand. The calculation in this study is based on ten-minutes interval data at 10 m observed during the year 2017-2019 by Thai meteorological department. Weibull distribution is applied to extract the monthly and yearly wind in the selected area by using wind atlas analysis and application program (WAsP). Moreover, in WAsP a stimulation was created to observe the comparison of potential of wind energy between three windiest sites located in the study area. The results generated show that the mean wind speed is 2.35m/s and the gradient wind direction from north and south are quite distinct. The annual energy production calculation of three sites in Uttaradit by WAsP estimates about 2125.815MWh, 3379.621MWh and 3369.235MWh respectively by using Bonus 300kW Mk III wind turbine. This paper suggests and supports the suitable sites and wind turbine for the electricity generation in Uttaradit. Hence, it will not only reduce the stress on conventional methods but also create awareness regarding the potential of wind energy.

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Assessment of wind energy potential of Hat Yai (Songkhla), Thailand

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IOP Conference Series: Materials Science and engineering 2021年第1期1163卷

作者： I Kamdar J Taweekun Energy Technology Program Faculty of Engineering Prince of Songkla University Hat Yai Songkhla 90112 Thailand. Department of Mechanical and Mechatronics Engineering Faculty of Engineering Prince of Songkla University Hat Yai Songkhla 90112 Thailand.

Due to environmental problems associated with fossil fuels and rising need for energy, wind power renewable energy will play a vital role in transformation of future energy structure in Thailand. Exploitation of wind energy for sustainable development, wind resource assessment plays an important role in wind power utilization. This case study presents wind resource assessment using the wind atlas analysis and application program (WAsP), in order to assess the potential of wind energy in Hat Yai, Thailand. Ten-minutes interval wind data observed by the Thai Meteorological Department recorded during the period 2017-2019, have been used to harness adequate wind power density and wind energy potential. The annual mean wind speed is 3.5 m/s at 10 m height above the ground. The prevailing direction southwest, south and northeast of the wind rose are very pronounced. The WAsP analysis estimates about 2,731.28 MWh of the total net annual energy production for the specific sites using the Enercon E-18 (80 kW) wind turbine of 1.92 MW capacity. The findings of this study indicate the possibility of the small-scale wind farm project for electricity generation in future.

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Grain size effect on saddle phenomenon in V-bending process of thin sheet metal 3rd

Grain size effect on saddle phenomenon in V-bending process ...

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3rd International Conference on Applied engineering, Materials and Mechanics, ICAEMM 2018

作者： Chen, Chang-Cheng Hong, Yi-Xiang Department of Mechanical Engineering Taipei City University of Science and Technology Taipei112 Taiwan Master Program of Mechatronics Taipei City University of Science and Technology Taipei112 Taiwan

ISBN: (纸本)9783035713374

The ability for predicting the springback on sheet metal bending processes is identified as an important feature of the ability for predicting the final geometry of sheet metal parts. The grain size effect makes the difficult on application of traditional design method in processing. As through tool and processing design, to understand the effects of grain size effects is an important and powerful way to effectively compensate for and eliminate the springback. In this paper, 99.5% pure iron specimens were annealed at different temperature to obtain the specified grain sizes. The effects of different grain sizes on the saddle after V-bending of the thin sheet metal were investigated. The results show that at the same thickness of specimens, the grain size has no significant effect on the saddle height. However, with increasing the thickness of the specimens the saddle will also be more prominent protruding height. The concave side of bent specimen is against the compression force and its grains structure tend to a round shape, whereas the convex side is against the tensile force and its grains structure tend to a flaky shape. © 2018 Trans Tech Publications, Switzerland.

关键词： Size determination

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Neural correlates of “Bioartificial Grasping” through a wearable robotic thumb for hand recovery

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Brain Stimulation 2025年第1期18卷 529-529页

作者： Giannotta, Alessandro Lomi, Francesco De Martino, Enrico Neri, Francesco Stramucci, Giulia Failli, Aurora Benelli, Alberto Santicioli, Sofia Scoccia, Adriano Smeralda, Carmelo Luca Sambati, Silvia Santarnecchi, Emiliano Prattichizzo, Domenico Rossi, Simone Siena Brain Investigation & Neuromodulation Lab (SiBin Lab) Unit of Neurology and Clinical Neurophysiology Department of Medicine Surgery and Neuroscience University of Siena Italy School of Advances Studies Center for Neuroscience University of Camerino Italy Center for Neuroplasticiy and Pain dept Health Science and Technology Aalborg University Denmark Department of Medicine Surgery and Neuroscience University of Siena Italy Precision Neuroscience & Neuromodulation Program Gordon Center for Medical imaging Massachusetts General Hospital Harvard Medical School Boton USA Department of Information Engineering and Mathematics University of Siena； Italy 2Humanoids & Human Centered Mechatronics centre Istituto Italiano di Tecnologia Genova Italy

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Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

Grain Size Effect on Saddle Phenomenon in V-Bending Process ...

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The Third International Conference on Applied engineering,Materials and Mechanics(ICAEMM 2018)

作者： Chang-Cheng Chen Yi-Xiang Hong Department of Mechanical Engineering Taipei City University of Science and Technology Master Program of Mechatronics Taipei City University of Science and Technology

The ability to predict springback on sheet metal bending processes is like an important feature of the ability to predict the final geometry of sheet metal parts. The grain size effect makes the application of traditional design method difficult in processing. Understanding the effects of grain size effects is an important and powerful way to effectively compensate for and eliminate springback as it passes through tool and process design. In this paper, 99.5% pure iron specimens were heat treated at different temperature to obtain the specified grain sizes. The effects of different grain sizes on the saddle after Vbending of the thin sheet metal were investigated. The results show that at the same thickness of specimens,the grain size has no significant effect on the saddle height. However, with the increase of the thickness of the specimens, the saddle will also be more prominent protruding height.

关键词： Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

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Non-newtonian Rabinowitsch Fluid Effects on the Lubrication Performances of Sine Film Thrust Bearings

Non-newtonian Rabinowitsch Fluid Effects on the Lubrication ...

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2017第二届电气工程，机械工程与自动化国际会议

作者： Jaw-Ren Lin Hsiu-Lu Chiang Yu-Kang Chiu Department of Mechanical Engineering Nanya Institute of Technology Master Program of Mechanical and Mechatronics Engineering Nanya Institute of Technology

Thrust bearings are generally developed to sustain axial load generated from rotating machinery. Predicting lubrication performances of thrust bearings plays an important role in engineering applications. Taking into account the effects of non-Newtonian rheology, the lubrication performances for a sine film thrust bearing are investigated in the present paper. By employing a small perturbation technique to the nonlinear non-Newtonian Reynolds equation, analytical solutions of the film pressure, the load-carrying capacity, the friction parameter and the required volume flow rate are derived. Comparing with the case lubricated with a Newtonian lubricant, the non-Newtonian Rabinowitsch fluids(including the pseudo-plastic fluids and the dilatant fluids) show significant influences on the lubrication performances of a sine film thrust bearing, especially for a larger value of the non-Newtonian parameter.

关键词： Non-newtonian Rheology Sine Film Thrust Bearings Load Performances

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Rules all PIs should follow

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Science (New York, N.Y.) 2022年第6588期376卷 24-26页

作者： Jennifer S Chen Chih Ying Huang Shantanu Lanke Michael Sanjay Fernandopulle Yongsheng Ji Yuan Zhi Sara Granado Rodríguez Andrea Y Frommel Martin Lukačišin Yida Zhang Christina N Zdenek Xiao-Yu Wu Senthilkumar Seenuvasaragavan Yan Zhuang Cathrine Bergh Jaime Coulbois Salam Salloum-Asfar Bo Cao Katherine Davis Fernanda Oda Nikos Konstantinides Liping Zhang Divyansh Agarwal Joseph Nicholas Rainaldi Jan Kadlec Jelle Vekeman Vishal Anirudh Kanigicherla Kathryn Oi Kyle J Isaacson Rakesh Ganji Emma Dawson-Glass Yale School of Medicine New Haven CT 06510 USA. Department of Physics National Cheng Kung University Tainan 70101 Taiwan (Republic of China). Maharashtra 422101 India. Medical Scientist Training Program Northwestern University Feinberg School of Medicine Chicago IL 60611 USA. Division of Life Sciences and Medicine University of Science and Technology of China Hefei Anhui 230026 China. School of Economics Guizhou University Guiyang Guizhou 550025 China. Department of Biology Universidad Autónoma de Madrid Madrid Madrid 28049 Spain. Faculty of Land and Food Systems University of British Columbia Vancouver BC V6T 1Z4 Canada. Faculty of Medicine Technion Haifa 3525433 Israel. Department of Biomedical Informatics Harvard University Brookline MA 02445 USA. School of Biological Sciences The University of Queensland St Lucia QLD 4072 Australia. Department of Mechanical and Mechatronics Engineering University of Waterloo Waterloo ON N2L 3G1 Canada. Mumbai 400076 India. Peking-Tsinghua Center for Life Sciences Peking University Beijing 100871 China. KTH Royal Institute of Technology 11428 Stockholm Sweden. Departamento de Ciencia Política y Relaciones Internacionales Universidad Autónoma de Madrid Ciudad Universitaria de Cantoblanco Madrid Spain. Qatar Biomedical Research Institute Hamad Bin Khalifa University Qatar Foundation Doha Qatar. Core Research Laboratory The Second Affiliated Hospital School of Medicine Xi'an Jiaotong University Xi'an Shaanxi 710004 China. Imperial College London London UK. Department of Applied Behavioral Science University of Kansas Lawrence KS 66045 USA. Université Paris Cité Centre National de la Recherche Scientifique Institut Jacques Monod F-75013 Paris France. Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen Guangdong 518055 China. Harvard Medical School Massachusetts General Hospital Boston MA 02114 USA. Department of Biomedical Science University of Calif

We asked young scientists to write a rule that all principal investigators (PIs) should be required to follow to improve the experience of young scientists in their lab. Read a selection of their suggestions below. Fo...

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MAKER: Automated pill dispenser 123

MAKER: Automated pill dispenser

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123rd ASEE Annual Conference and Exposition

作者： Chariah, Christopher Kumia, Nicholas Zubarriain, Jonathan R. He, Shouling Rahemi, Hossein Jack, Hugh Mechatronics Engineering Program Vaughn College of Aeronautics and Technology United States Western Carolina University United States

This paper outlines a project idea for an Automated Pill Dispenser (APD) for home usage. It is developed using CAD software, 3D printed parts, Arduino Mega Microcontroller, continuous and non-continuous servos, optical sensors and a 5-inch LCD display interface to create a cost effective and reasonably priced alternative to the traditional medication dispensers. The design is modular and able to house up to four dispensing units on one control unit. The basic housing for the dispensing unit consists of three pieces which connect to the control unit which holds the LCD interface. The target users for this project are senior citizens. According to an article published in the New England Journal of Medicine, between 2007 and 2009, 99,628 emergency room visits were made by seniors. Two thirds of them were due to accidental overdoses. The design of the machine could be improved by adding a safety measure that would prevent an incorrect amount of pills being dispensed. Aside from this, the current design is effective in showing the potential safety benefits of a low cost at-home pill dispenser. © American Society for engineering Education, 2016.

关键词： Automation C++ programming Commercial modular design Medical assistance

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Fiber‐in‐Tube Design of Co9S8‐Carbon/Co9S8: Enabling Efficient Sodium Storage

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Angewandte Chemie 2019年第19期131卷

作者： Xiaoyan Li Kaikai Li Sicong Zhu Ke Fan Linlong Lyu Haimin Yao Yiyang Li Jinlian Hu Haitao Huang Yiu‐Wing Mai John B. Goodenough Department of Applied Physics The Hong Kong Polytechnic University Hong Kong China Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong China Department of Mechanical Engineering The Hong Kong Polytechnic University Hong Kong China College of Science and Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong China Centre for Advanced Materials Technology (CAMT) School of Aerospace Mechanical and Mechatronics Engineering J07 The University of Sydney Sydney NSW 2006 Australia Texas Materials Institute and Materials Science and Engineering Program The University of Texas at Austin Austin TX 78712 USA

The sodium‐ion battery is a promising battery technology owing to its low price and high abundance of sodium. However, the sluggish kinetics of sodium ion makes it hard to achieve high‐rate performance, therefore impairing the power density. In this work, a fiber‐in‐tube Co 9 S 8 ‐carbon(C)/Co 9 S 8 is designed with fast sodiation kinetics. The experimental and simulation analysis show that the dominating capacitance mechanism for the high Na‐ion storage performance is due to abundant grain boundaries, three exposed layer interfaces, and carbon wiring in the design. As a result, the fiber‐in‐tube hybrid anode shows a high specific capacity of 616 mAh g −1 after 150 cycles at 0.5 A g −1 . At 1 A g −1 , a capacity of ca. 451 mAh g −1 can be achieved after 500 cycles. More importantly, a high energy density of 779 Wh kg −1 and power density of 7793 W kg −1 can be obtained simultaneously.

关键词： Anoden Co9S8-Kohlenstoff/Co9S8 Korngrenzen Pseudokapazität Natriumionenbatterien

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