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IEEE Symposium on Position Location and Navigation (PLANS)

作者： Kana Nagai Yihe Chen Matthew Spenko Ron Henderson Boris Pervan Mechanical and Aerospace Engineering Illinois Institute of Technology Chicago U.S. Landscape Architecture + Urbanism Program Illinois Institute of Technology Chicago U.S.

This paper examines the safety of LiDAR-based navigation for driverless vehicles and aims to reduce the risk of extracting information from undesired obstacles. We define the faults of a LiDAR navigation system, derive the integrity risk equation, and suggest landmark environments to reduce the risk of fault-free position error and data association faults. We also present a method to quantify feature extraction risk using reflective tape on desired landmarks to enhance the intensity of returned signals. The high-intensity returns are used in feature extraction decisions between obstacles and pre-defined landmarks using the Neyman-Pearson Lemma. Our experiments demonstrate that the probability of incorrect extraction is below 10 −14 , and the method is sufficient to ensure safety.

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Affecting Factors of Efficiency in Photovoltaic Energy Systems and Productivity-Enhancing Suggestions

Affecting Factors of Efficiency in Photovoltaic Energy Syste...

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2022 Innovations in Intelligent Systems and Applications Conference, ASYU 2022

作者： Ay, Ilker Kademli, Murat Karabulut, Sener Savas, Serkan Resources Technology Program Hacettepe Ankara Chamber of Industry 1st Organized Industrial Zone Vocational School Hacettepe University Department of Alternative Energy Ankara Turkey Hacettepe Ankara Chamber of Industry 1st Organized Industrial Zone Vocational School Hacettepe University Department of Mechanical Program Ankara Turkey Kirikkale University Faculty of Engineering and Architecture Department of Computer Engineering Kirikkale Turkey

ISBN: (数字)9781665488945

ISBN: (纸本)9781665488945

In recent years, hazardous gases emission from fossil fuels has attracted public concerns due to its worse effects on the ecosystem and living conditions not only mankind but also all creatures living on earth. That's why solar energy has a vital role in alternative energy resources. Solar energy sources will gain more importance in the future. As it is known, the most needed type of energy today is electrical energy. Thus, in this study, the necessary conditions for the photovoltaic (PV) systems used in solar energy production to operate at maximum performance and which parameters are required to control these conditions are examined. The results show that four parameters that we need to measure. These are: maximum operating current of a panel/cell (Impp), maximum operating voltage of a panel/cell (Vmpp), panel surface temperature and light intensity falling on the panel. Except for the panel surface temperature, the rest of the parameters can be measured directly. However, affecting the panel surface temperature;we must not ignore parameters such as ambient temperature, wind speed, humidity and light intensity. Therefore, while determining the panel surface temperature, these parameters should also be measured and a surface temperature should be determined accordingly. © 2022 IEEE.

关键词： Surface temperature

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Component Criticality Rating of a Subsea Manifold using FMECA 32nd

Component Criticality Rating of a Subsea Manifold using FMEC...

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32nd European Safety and Reliability Conference, ESREL 2022

作者： Nicolau, Andressa S. Martins, Maximiano C. Paulo, Fernando F. Melo, Frutuoso E. Schleder, Adriana M. Martins, Marcelo R. De Barros, Leonardo O. Orlowski, Rene Thiago C. COPPE Graduate Program of Nuclear Engineering Federal University of Rio de Janeiro Rio de Janeiro Brazil LabRisco Analysis Evaluation and Risk Management Laboratory Naval Architecture and Ocean Engineering Department University of Sao Paulo Sao Paulo Brazil CENPES Research and Development Center of Petrobras Petrobras Brazil

ISBN: (纸本)9789811851834

Subsea manifold is a metallic structure fixed to the seabed, in which valves and accessory equipment are installed that make it possible to couple Wet Christmas Trees and other production systems (such as Pipeline End Manifold, Pipeline End Termination and risers);it is required during the completion and production of oil and gas wells. The failure of the subsea manifold can cause serious damage to the environment and human health, as well as stop production causing the loss of large foreign exchange, so ensuring its integrity is extremely important for the sector. In this article a Failure Mode, Effects and Criticality Analysis is presented for the criticality classification of the components of a typical subsea manifold cluster, Pipeline end manifold and Pipeline end termination. The final effect of equipment failure in the manifold was evaluated as a function of production interruption, production reduction, rupture, environmental pollution, plugging, leakage and structural collapse. Different means of detection were considered. The results of this study provide information about the weakness of the subsea manifold equipment. It is expected that this paper can contribute to future analysis of similar equipment and means to contribute to future work involving risk analysis, and inspection maintenance plan. © 2022 ESREL2022 Organizers. Published by Research Publishing, Singapore.

关键词： Christmas trees (wellheads)

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Numerical analysis of the influence of the contact boundary condition and specimen geometry on concrete compressive strength

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Procedia Structural Integrity 2023年 47卷 261-267页

作者： Caroline Bremm Luísa Inda Leandro Ferreira Friedrich Sabrina Vantadori Ignacio Iturrioz Luis Kosteski Engineering Post Graduation Program Federal University of Pampa Av. Tiaraju 810 Alegrete 97546-550 Brazil Civil Engineering Graduate Program Federal University of Pampa Av. Tiaraju 810 Alegrete 97546-550 Brazil Program of Mechanical Pos-Graduation Federal University of Rio Grande do Sul Sarmento Leite 425 Porto Alegre 90040-060 Brazil Department of Engineering & Architecture University of Parma Parco Area delle Scienze 181/A 43124 Parma Italy

In the present paper, the influence of the contact boundary condition and specimen geometry on the concrete compressive strength is numerically investigated by using a version of the Lattice Discrete Element Method (LDEM), implemented on Abaqus/Explicit. More precisely, two types of contact boundary conditions are considered and, for each of them, three different slenderness levels (height/width ratio - h/b) are analyzed (that is, h/b = 0.5, 1.0, and 2.0) by considering a square cross-section. Moreover, for h/b = 2.0, a circular cross-section is also examined. Two models are developed: one by using the LDEM and the other by using a hybrid model, combining Finite Elements and LDEs. The results show that both the boundary conditions and the sample geometry influence the axial compressive strength.

关键词： Abaqus concrete compressive strength Lattice Discrete Element Method (LDEM)

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Structural Characteristics, Wear Behavior, and Failure Mechanism of Thermal Sprayed Commercial Ni-Cr and Low-Cost Innovative Blast Furnace Slag Coatings

SSRN

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SSRN 2023年

作者： Ozgurluk, Yasin Ozkan, Dervis Gok, Mustafa Sabri Odabas, Okan Binal, Gulfem Gulec, Ahmet Parlakyigit, Abdullah Selim Karaoglanli, Abdullah Cahit Bartin University Faculty of Engineering Architecture and Design Mechanical Engineering Department Bartin74110 Turkey Program of Medical Services and Techniques Vocational School of Health Services Bartin University Bartin74100 Turkey Bartin University Faculty of Engineering Architecture and Design Metallurgical and Materials Engineering Department Bartin74110 Turkey Program of Machine and Welding Technology Karasu Vocational School Sakarya University of Applied Sciences Sakarya54500 Turkey Istanbul Medeniyet University Faculty of Engineering and Natural Sciences Mechanical Engineering Istanbul34700 Turkey

It is very important to reintroduce waste to the economy in the most efficient way and to reduce their amount both from the point of view of economic and environmental problems. However, when waste is evaluated, not only its elimination but also its use in areas with high added value should be considered. This study is aimed to create a different usage area for the slag wastes that cause problems to the environment and factories. For this reason, two different coatings;the low-cost BFS and commercial 80Ni-20Cr coatings have been successfully deposited on 316L stainless steel substrates by atmospheric plasma spraying (APS) and high-velocity oxy-fuel (HVOF) spraying techniques, respectively. The coatings’ microstructural properties and wear performance were studied under dry sliding conditions in ball-on-flat reciprocating tests using an Al2O3 ball as the counterpart. Reciprocating wear tests were comparatively evaluated under various dry sliding conditions. Scanning electron microscopy (SEM) and energy dispersive spectroscopy was used to examine the surface morphology and elemental analysis of coatings (EDS). The wear traces obtained from the tests were examined using a 3D optical profilometer. The phases in the samples were determined with the X-ray diffraction (XRD) technique. This study was carried out to determine the applicability of BFS waste material in material coating technologies, to investigate its usability in industrial applications, and to determine its performance for commercially used coatings against wear-oriented damage mechanisms. As a result of the study results, it has been seen that BFS material can be produced by the thermal spray coating method in material coating technologies and has similar properties to Ni-Cr coatings in commercial use in terms of wear performance. © 2023, The Authors. All rights reserved.

关键词： Slags

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Study on zero energy house (Part 1): Evaluation of life-cycle cost for all-electrified detached ZEH

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Journal of Environmental engineering (Japan) 2021年第784期86卷 638-648页

作者： Arinami, Yuki Akabayashi, Shin-Ichi Fang, Yajing Architecture Program Faculty of Eng. Niigata Univ. Japan Grad. School of Science and Technology Niigata Univ. Japan Engineering Managemant Div. Sanken Setsubi Kogyo Co. Ltd. Japan

Zero energy house (Zivil) is expected lo have a significant initial cost increase compared to conventional houses. In this study, the life-cycle cost and economy of all-electrified detached ZEH are evaluated. The increase of the initial cost by the ZEH and the reduction of the running cost by the energy saving effect are examined. In case D (COP of hot water heater: 3, air conditioning: continuous use), the investment payback period is the shortest in the analysis case in any region. In Kobe, Kochi and Fukuoka, the payback period is about 10 years. © 2021 Architectural Institute of Japan. All rights reserved.

关键词： Costs

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Machine Learning Approach to IoT- Based Water Quality Monitoring

Machine Learning Approach to IoT- Based Water Quality Monito...

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IEEE Eurasia Conference on Biomedical engineering, Healthcare and Sustainability (ECBIOS)

作者： Chin-Chih Chang Chi-Hung Wei Min-Tien Lin Sz-Chwun John Hwang Department of Computer Science and Information Engineering Chung Hua University Hsinchu Taiwan Program in Engineering Science Chung Hua University Hsinchu City Taiwan Department of Landscape Architecture Chung Hua University Hsinchu Taiwan

Water resources are inevitable for human survival but untreated wastewater harms the environment. Thus, ongoing monitoring of water quality is necessary to identify pollution sources and prevent further damage. For such monitoring, an IoT water quality monitoring system was developed using Arduino technology to collect and transmit data to MQTT Brokers and store it in a database. The data is presented on a monitoring webpage. Three machine learning methods (Random Forest, ANN, and LightGBM) were used for backend analysis and prediction. LightGBM was found to have the highest prediction accuracy for NH3, pH, ORP, and temperature. The research contributes to reducing the need for frequent and costly data collection by using an IoT system for real-time monitoring and employing machine learning predictions to compensate for missing data. This approach provides a more efficient and effective method for analyzing and predicting water quality.

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Plugging Effect of Fine Pore Water in Opc and LC3 Paste During Accelerated Carbonation Monitored Via Single-Sided Nuclear Magnetic Resonance Spectroscopy

SSRN

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SSRN 2024年

作者： Cheng, Luge Kurihara, Ryo Ohkubo, Takahiro Kitagaki, Ryoma Suda, Yuya Teramoto, Atsushi Maruyama, Ippei Department of Architecture Graduate School of Engineering The University of Tokyo Tokyo113-8656 Japan Department of Applied Chemistry and Biotechnology Graduate School of Engineering Chiba University Chiba263-8522 Japan Division of Human Environmental Systems Graduate School of Engineering Hokkaido University Sapporo060-8628 Japan Department of Architecture Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima739-8527 Japan Civil Engineering Program Faculty of Engineering University of the Ryukyus Okinawa903-0213 Japan Nagoya University Japan

This study focuses on the investigation of the influence of CO2 concentration on the carbonation process in cementitious paste using ordinary Portlandite cement and limestone-calcined clay cement, specifically on the water content distribution. Employing single-sided nuclear magnetic resonance spectroscopy for water profiling, we revealed that the water content of fine pores (interlayer space and gel pores) was consistent at the carbonation front under accelerated carbonation processes with CO2 concentrations of 5% and 1%, demonstrating the plugging effect where fine pore water governs the carbonation progress. This effect was absent under natural carbonation conditions because of the carbonation process was slower than drying. It was confirmed that the rate-determining mechanisms of natural and accelerated carbonation with CO2 concentrations greater than 1% were different. © 2024, The Authors. All rights reserved.

关键词： Carbonation

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Laminated Solid Timber Slab with Transverse Prestressing Using the Strategy of Interleaved Vertical Displacement of Lamellae

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Journal of Civil engineering and architecture 2024年第4期18卷 186-198页

作者： Bianca Bispo dos Reis Jorge Daniel de Melo Moura Marcos Vinício de Camargo Everaldo Pletz Graduate Program in Architecture and Urbanism Londrina State UniversityJardim Portal de Versalhes 1Londrina 86057-970PRBrazil Department of Civil Engineering Federal Technological University of Paraná(UTFPR)Apucarana 86812-460PRBrazil Retired professor Department of Structural Engineering Londrina State UniversityLondrina 86057-970PRBrazil

This article presents a study on the structural behavior of transversely prestressed laminated timber slabs,focusing on an innovative approach:vertically misaligned *** misalignment,achieved by sliding vertically the wooden lamellae rather than aligning them,enhances the slab’s cross-section moment of inertia,thereby improving load-bearing capacity and *** involved two groups of structural size specimens:one with vertically aligned lamellae(control group)and the other with misaligned lamellae(study group).Results showed the study group exhibited 42%superior stiffness and 10%less load capacity compared to the *** typically occurred individually in the lamellae,particularly in those with defects or lower modulus of elasticity,concentrated in the middle third of the slabs’free span where tensile stresses *** a higher number of failed lamellae,the study group demonstrated promising *** of prestressing bar indicated no damage at all in the thread,suggesting potential for reducing bar *** findings offer crucial insights into applying these slabs in timber construction as well as to any kind of construction.

关键词： Transversal prestressed slabs wooden construction plantation wood flexural testing design methodology

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Durable Pet Air Filter Based on a Biomimetic Surface Functionalization Method for Formaldehyde Degradation and Aerosol Filtration

SSRN

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SSRN 2024年

作者： Li, Yunhe He, Weidong Shen, Ruiqing Zhou, Xiaotong Liu, Jingxian Filter Test Center School of Resources and Civil Engineering Northeastern University NO. 3-11 Wenhua Road Heping District Liaoning Shenyang110819 China Fire Protection & Safety Engineering Technology Program College of Engineering Architecture and Technology Oklahoma State University StillwaterOK74078 United States

Currently, most air filters, such as polyester (PET) fiber non-woven fabric, only have a single function of particulate filtration. However, the removal of substances harmful to human health, such as volatile organic compounds (VOCs) and bacteria, is becoming increasingly important in indoor air purification. Herein, based on the biomimetic surface functionalization properties of polydopamine (PDA) and the photocatalytic degradation of organic matter and the antibacterial effect of RGO (reduced graphene oxide)-TiO2, a multifunctional PET/PET-PDA-RGO-TiO2(P/PPRT) filter with a sandwich structure was prepared for formaldehyde degradation, aerosol filtration, and bactericidal operation. When the preparation concentrations of DA (dopamine), GO (graphene oxide), and TiO2 solutions are 2 g/L, 0.05 g/L, and 20 g/L, respectively, P/PP2R0.05T20 maintains optimal performance of photocatalytic reaction kinetics and reaches a formaldehyde degradation rate of higher than 79% within 300 min in the 7th cycle of usage. Compared with the base subtracts, P/PP2R0.05T20 has the highest filtration efficiency of 88.57% to 99.18% for 0.3 to 10 µm particles, respectively, and has a filtration efficiency of higher than 74% for 0.3 µm particles in the 7th cycles of usage. The quality factor of P/PP2R0.05T20 is improved significantly due to the sandwich structure. The effect of loaded particulate on the catalyst on photocatalytic degradation of formaldehyde was also studied. It was found that the photocatalytic formaldehyde degradation rate of P/PP2R0.05T20 is about 81.8% within 300 min under different A2 particulate load content. In addition, P/PP2R0.05T20 has a bioaerosol removal rate of higher than 99% against Escherichia coli. This study provides a practical approach to preparing a multifunctional air filter with the performance of aerosol filtration, photocatalytic degradation of formaldehyde, and bactericidal function using PET non-woven fabric. © 2024, The Authors. All rights reserved.

关键词： Volatile organic compounds

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