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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Akci, Hilal Gunerhan, Huseyin Hepbasli, Arif Ege University Graduate School of Natural and Applied Science Mechanical Engineering Program Bornova Izmir35100 Turkey Ege University Faculty of Engineering Department of Mechanical Engineering Bornova Izmir35100 Turkey Yasar University Faculty of Engineering Department of Energy Systems Engineering Bornova Izmir35100 Turkey

ISBN: (纸本)9786250008430

In this study, energy, exergy and sustainability analyses are performed for a solar energy-based hydrogen production system, which is modeled with TRNSYS and engineering Equation Solver (EES) software packages. This system consists of solar photovoltaic panels (PVs), a controller, an electrolyzer, a metal hydride hydrogen tank used for hydrogen production and storage, and Proton Exchange Membrane Fuel Cell (PEMFC) for electricity storage. Dead state temperature is taken as 0 ºC. The results revealed that the PEMFC had the highest energy efficiency of 53.28%. Exergy efficiencies of the solar PV panel, the electrolyzer and the PEMFC were determined to be 9.66%, 60% and 29.39%, respectively. The exergetic sustainability index of the electrolyzer had the maximum value of 2.501. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Hydrogen production

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Study of Integral Variable Structure Control Method for Stability of SI Engine Idling Speed

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Journal of Software engineering and Applications 2010年第8期3卷 813-819页

作者： Yang Zhang Nobuo Kurihara Science Program in Mechanical Systems Hachinohe Institute of Technology Graduate School of Engineering Hachinohe Institute of Technology

The intake air control system of a gasoline engine is a typical nonlinear system, and included among the adverse fac-tors that always induce poor idle-speed control stability are dead time and disturbances in the intake air control process. In this paper, to improve the responsiveness when idling with regard to disturbances, a mean-value engine model (MVEM) with dead time was constructed as the control object, and the two servo structures of sliding mode control (SMC) were studied for better idle control performance, especially in transient process of speed change. The simulation results confirmed that under the constraint condition of control input, the robustness of idle speed control that is being subjected to torque disturbances and noise disturbances can be greatly improved by use of the servo structure II.

关键词： SI Engine Idle Speed Control Variable Structure Integral Sliding Mode Control Simulation

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Protein Folding as a Jamming Transition

PRX Life

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PRX Life 2025年第1期3卷 013018-013018页

作者： Alex T. Grigas Zhuoyi Liu Jack A. Logan Mark D. Shattuck Corey S. O'Hern Graduate Program in Computational Biology and Biomedical Informatics Yale University New Haven Connecticut 06520 USA Integrated Graduate Program in Physical and Engineering Biology Yale University New Haven Connecticut 06520 USA Department of Mechanical Engineering Yale University New Haven Connecticut 06520 USA Benjamin Levich Institute and Physics Department The City College of New York New York New York 10031 USA Department of Physics Yale University New Haven Connecticut 06520 USA Department of Applied Physics Yale University New Haven Connecticut 06520 USA

Proteins fold to a specific functional conformation with a densely packed core that controls their stability. Despite their importance, we lack a quantitative explanation for why all protein cores, regardless of their overall fold, possess the same average packing fraction 〈ϕ〉≈0.55. However, important developments in the physics of jamming in particulate systems can shed light on the packing of protein cores. Here, we extend the framework of jamming to describe core packing in collapsed polymers, as well as in all-atom models of folded proteins. First, we show in a spherical bead-spring polymer model (with and without bond-angle constraints) that as the hydrophobic interactions increase relative to thermal fluctuations, a jamming-like transition occurs when the core packing fraction exceeds ϕc with the same power-law scaling behavior for the potential energy Vr, excess contact number ΔN, and characteristic frequency of the vibrational density of states ω* versus Δϕ=ϕ−ϕc as that for jammed particulate systems. Then, we develop an all-atom model for proteins and find that, above ϕc∼0.55, protein cores undergo a jamming-like transition, but with anomalous power-law scaling for Vr, ΔN, and ω* versus Δϕ. The all-atom protein model remains close to the native protein structure during jamming and accurately refolds from partially unfolded states.

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Outcomes of a systems engineering project for K-12 teachers 122

Outcomes of a systems engineering project for K-12 teachers

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2015 122nd ASEE Annual Conference and Exposition

作者： Bartus, Greg Fisher, Frank T. Stevens Institute of Technology Center for Innovation in Engineering and Science Education United States Department of Mechanical Engineering United States Nanotechnology Graduate Program Stevens United States

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Analysis of the influence of the type of curing on the axial compressive strength of concrete

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Materials Today: Proceedings 2022年 58卷 1211-1214页

作者： Cremonez, Claiton Maria McCartney da Fonseca, Juliana Carolina Seguro Cury, Ana Otto Ferreira, Elizamary Mazer, Wellington Graduate Program in Civil Engineering Universidade Tecnológica Federal do Paraná R. Dep. Heitor Alencar Furtado 5000 – Cidade Industrial de Curitiba Curitiba81280-340 Brazil

The curing process is one of the most important steps in the concrete execution, providing the complete hydration of the Portland cement compounds, avoiding the shrinkage phenomenon and ensuring the strength of the structure. This paper intends to understand the influence of immersed in water and lime curing, chemical curing, with the use of plastic film, and open air curing on concretes with axial compressive strength fck 30 Mpa. The specimens were analyzed for 63 days, at 4 ages of rupture. The concretes, when submitted to immersed curing in water and lime, had a significant difference when compared to the other methods. The concretes that were submitted to the other cures had a lower mechanical resistance, sometimes significative, sometimes not significant when compared among themselves. © 2022

关键词： Lime

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The influence of industrial work practices and workshop infrastructure facilities on work readiness of students 6

The influence of industrial work practices and workshop infr...

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6th International Conference on Technology and Vocational Teachers, ICTVT 2020

作者： Setyadi, M.R.A. Triyono, M.B. Daryono, R.W. Graduate Program of Technological and Vocational Education Universitas Negeri Yogyakarta Yogyakarta Indonesia Department of Mechanical Engineering Education Faculty of Engineering Universitas Negeri Yogyakarta Yogyakarta Indonesia

This study aims to determine the influence of industrial work practice and workshop facilities on work readiness in class XI mechanical engineering. The research subjects were 101 students of class XI mechanical engineering, using the ex post facto research method using statistical analysis using the SPSS program. The results of the study are as follows: (1) industrial work practices have a positive effect on job readiness with a significance of 0.000, a determination coefficient of 30% has an effect;(2) Workshop infrastructure has a positive influence on work readiness with a significance value of 0.000, 28.6% determination efficiency has an effect;(3) industrial work practices and infrastructure together have an influence on job readiness indicated by a significance value of 0.000 having a coefficient of determination 58,6% in influencing job readiness. © Published under licence by IOP Publishing Ltd.

关键词： engineering research

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Concept of an offshore aquaculture system with an automated feeding platform

Concept of an offshore aquaculture system with an automated ...

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27th International Conference on Offshore Mechanics and Arctic engineering, OMAE 2008

作者： Tsunoda, Tomoyuki Kitazawa, Daisuke Kinoshita, Takeshi Ito, Sho Bao, Weiguang Itakura, Hiroshi Fujino, Masatoshi Dept. of Environmental and Ocean Engineering Graduate School of Engineering University of Tokyo Japan Dept. of Mechanical and Biofunctional Systems Institute of Industrial Science University of Tokyo Japan

ISBN: (纸本)9780791848234

With the increasing world demand for seafood and environmental problems in coastal aquaculture, offshore area has been increasingly expected to be utilized for aquaculture. The present study proposed the concept of an offshore aquaculture system with an automated feeding platform. The offshore aquaculture system has fewer effects on the surrounding marine environment through the rapid diffusion of organic wastes than the coastal one. The offshore area then provides clean waters for cultured fish. On the other hand, the offshore aquaculture system is subject to the severe natural condition such as typhoon attack. Actually, in the current aquaculture system, the cultured fish is starved during a few days before and after typhoon attack since the feeding ship is not able to approach the offshore sea cages, which is submerged every time around 10m below the sea surface to escape from high waves and strong currents. The automated feeding system should be therefore developed to enable the cultured fish to grow faster under the severe natural condition. The proposed system consists of several submerged fish cages and a feeding platform, which includes fuel tanks, feed storage silos, and an automated feeding machine. The feeding platform was designed by numerical analysis and tank model test in order to suppress its motion as small as possible. The motion of the feeding platform was first predicted by numerical analysis. The unmoved point was formed at each period of the incident wave. It moves upward as the period of the incident wave increases. Consequently, the point at 8m below the sea surface (3m above the bottom of the feeding platform) is the best one to attach the feeding hose. As a result of tank model test, pitch and heave motions of the feeding platform were dominant in the waves with short (1.5 seconds) and long (3.1 seconds) periods, respectively. An unmoved point was observed on the surface of the feeding platform as predicted by the numerical model, while the

关键词： Aquaculture

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Low-cost, high-accuracy, state estimation for vehicle collision prevention system

Low-cost, high-accuracy, state estimation for vehicle collis...

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2012 8th International Symposium on Mechatronics and its Applications, ISMA 2012

作者： Saadeddin, Kamal Abdel-Hafez, Mamoun F. Jarrah, Mohammad Amin Mechatronics Engineering Graduate Program American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9781467308625

In this paper, a low-cost navigation system with high integrity and reliability is proposed for enhancing highway traffic safety in adverse weather situations, such as a foggy or rainy weather. A high-integrity, 15-state, estimation filter is proposed to obtain a high accuracy state estimate. The filter utilizes a vehicle velocity constraint measurement to enhance the accuracy of the estimate. Two estimations filters, the Kalman filter (KF) and the information filter (IF), are designed and compared to obtain the estimate of the vehicle state. An instrumentation system that consists of a microcontroller, a GPS receiver, an IMU, encoders, and a Zigbee transceiver is constructed. The microcontroller provides a vehicle navigation solution at 50 Hz by fusing the measurements of the IMU, the GPS receiver and the digital compass using the proposed filter design. Experimental tests, using the proposed system, are conducted and the obtained results are presented. These results are processed with and without the velocity constraints. The estimation accuracy improvement with the addition of the velocity constraints is demonstrated. Also, results of a static test are used to assess the accuracy of the low-cost navigation systems against a commercial solution. © 2012 IEEE.

关键词： Global positioning system

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Heading Angle Estimation Using Intelligent Fusion for Autonomous Vehicles

Heading Angle Estimation Using Intelligent Fusion for Autono...

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2023 Advances in Science and engineering Technology International Conferences, ASET 2023

作者： Barakat, Ali A. Jardat, Mohammad A. Elsergany, Ahmed M. Sherif, Nidal A. American University of Sharjah Mechanical Engineering Department Sharjah United Arab Emirates American University of Sharjah Mechatronics Engineering Graduate Program Sharjah United Arab Emirates

ISBN: (纸本)9781665454742

Low-cost navigation systems for ground vehicles often rely on the fusion with Global Positioning System (GPS) for improved state estimation. In this study a low-cost gyroscope is fused with a GPS for improved vehicle heading angle estimation using several Artificial Intelligence (AI) based architectures that include Shallow Neural Networks (SNN), Multi-Layer Neural Networks (MLNN), and Adaptive Neuro- Fuzzy Inference systems (ANFIS). The primary goal behind using AI based sensor fusion is to obtain a highly accurate vehicle heading estimation suitable for autonomous navigation applications. When available, the GPS signal is used to correct the vehicle's heading angle. The neural networks and ANFIS methods both use the difference between the GPS signal and the heading angle from the integrated gyroscope as inputs. The performance achieved is shown and analyzed. According to the results obtained, the MLNN provides the most accurate heading estimates. © 2023 IEEE.

关键词： Global positioning system

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From farm to land: Characteristics of biochar for agricultural purposes 27th

From farm to land: Characteristics of biochar for agricultur...

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27th European Biomass Conference and Exhibition, EUBCE 2019

作者： de Souza, Débora Machado Kappler, Genyr Bueno, Andriele Brizolla Silva, Jenifer Lima da Modolo, Regina Célia Espinosa Moraes, Carlos Alberto Mendes Tarelho, Luís António da Cruz Brehm, Feliciane Andrade Graduate Program in Mechanical Engineering University of Vale do Rio dos Sinos-UNISINOS São LeopoldoRS93022-000 Brazil Graduate Program in Civil Engineering UNISINOS Portugal Undergraduate students in Environmental Engineering UNISINOS Portugal Department of Environment and Planning/CESAM University of Aveiro Aveiro3810193 Portugal

Agribusiness has a significant role in the life of billions of people and is an essential component in the economy of many countries. In Brazil agribusiness is one of the most prominent components in the economy and it accounted for 21% of the Gross Domestic Product in 2016. The soil is a non-renewable resource, and its adequate management becomes increasingly relevant to maintain its fertility and ensure the production of food to supply the population and industries in the food sector. The use of chemical fertilizers and mineral correctives is a requirement of modern agriculture and is practically indispensable for the management of crops. However, it is not an environmental friendly management technique method and may cause economic losses. On the other hand, there is an acknowledgment of nature-based solutions that contribute to improving soil quality while reducing the environmental burden from modern agrosystem. The choice for utilizing rice husk as biomass feedstock in this research is based on the current reality of Brazil, where there is an annual production of approximately 11.7 million tons of rice, from which around 20% become residue. Considering that Brazil has large areas of cultivation and that agriculture residues are still underutilized, the objective of this study was to evaluate the influence of biochar obtained from rice husk in the fertility of soil based on two parameters, which are porosity and water holding capacity. The conversion of agricultural residues into soil conditioners, i.e., closing the cycle of nutrients from farm to land, is an interesting option for sustainable resource management, which should also encompass the environmental, social and economic aspects. © 2019 ETA-Florence Renewable Energies.

关键词： Agriculture Biochar Biomass Fertilizers

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