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2022 4th International Conference on Advanced Materials and Ecological Environment, AMEE 2022

作者： Xia, Bing Li, Xiaofei Yang, Xiaoyan Zhang, Donghai Zhang, Miao Li, Hao Xu, Shanjun Kong, Deqing Li, Xiang Beijing Guodianfutong Science & Technology Development Co. Ltd. Beijing100071 China Nari Group Corporation State Grid Electric Power Research Institute Jiangsu Nanjing211106 China Institute of Process Engineering Chinese Academy of Sciences Beijing102401 China

An insulator plays an important role in the external insulation of power grid. The antifouling flashover coating on the insulator's surface can effectively reduce the incidence of pollution flashover accidents. Local overheating, local arc, lightning and other damage lead to the deterioration of the antifouling flashover coating, resulting in pollution flashover accidents. In order to realize the on-line identification of electric arc on the surface of antifouling flashover coating, various functional nanoparticles were prepared and added into the silicone rubber to prepare functional antifouling flashover coating. The colour deviation of the coating heated at different temperatures was measured by a spectrophotometer, and the trace of arcs on the sample surface was observed. The results show that the functional nanoparticles can slightly improve the tensile strength and AC breakdown strength of silicone rubber composites. The composites change colour in 2 min at 250°C or 1s at 500°C, showing obvious indication traces after an electric arc passes the surface of an insulator in a short period. Still, the composites possess excellent functional properties after 1000h artificial accelerated aging test. © Published under licence by IOP Publishing Ltd.

关键词： Nanoparticles

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Compact High Power Density Axial Flux PM Motor for Surgical Robotics Application

Compact High Power Density Axial Flux PM Motor for Surgical ...

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IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： Madhavan Ramanujam Norbert Veignat Dipak Mane Yogesh Lulle Sandip Dhanwate Andrew Sharp Research and Development Portescap West Chester PA USA Research and Development Portescap La Chaux-de-Fonds Switzerland Design and Development Portescap Mumbai INDIA Process Quality Engineering Portescap Mumbai INDIA CAD Engineering Portescap Mumbai INDIA

Motor topologies for the surgical robotics application should have the characteristics of smoother operation at low-speed region and improved dynamic response. In addition, the motor must be lighter in weight and compact in size. To achieve these performance indices, single-sided axial flux permanent magnet motor configuration having optimal slot-pole combination with soft magnetic composite based open-slotted stator design is proposed. The stator tooth profiling is introduced to reduce or eliminate the cogging torque. Finite element-based simulation is carried out to understand the effect of the stator tooth profiling on the selected 12slot, 10pole motor configuration is presented. In addition, the prototype motor built, and motor performance is measured and analyzed. It is shown that chamfering on the stator tooth helps to reduce the cogging torque magnitude within the required specifications of 0.5mNm.

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On the use of Physics in Machine Learning for Manufacturing process Inspection 6

On the use of Physics in Machine Learning for Manufacturing ...

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Optical Methods for Inspection, Characterization, and Imaging of Biomaterials VI 2023

作者： Barbastathis, George Zhang, Qihang Pandit, Ajinkya Tang, Wenlong Papageorgiou, Charles Braatz, Richard D. Myerson, Allan S. Tan, Bingyao Schmetterer, Leopold Department of Mechanical Engineering Denmark Department of Chemical Engineering Massachusetts Institute of Technology United States Singapore-MIT Alliance for Research & Technology Centre Massachusetts Institute of Technology United States Data Sciences Institute United States Process Chemistry Development Takeda Pharmaceuticals International Company United States School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore

ISBN: (数字)9781510664548

ISBN: (纸本)9781510664531

We discuss the use of machine learning in computational imaging for manufacturing process inspection and control. In a recent article1 we described a physics-enhanced auto-correlation based estimator (Peace) for quantitative speckle. We derived an explicit forward relationship between the particle size distribution (PSD) and the speckle autocorrelation for particle sizes significantly larger than the wavelength (×100 „ ×1,000). We subsequently trained a machine learning kernel to invert the autocorrelation and obtain the PSD, using the explicit forward model to reduce the number of experimentally acquired examples. In this talk, we present an expanded discussion of Peace and its properties, including spatial and temporal sampling and accuracy, and more general applications. © 2023 SPIE. All rights reserved.

关键词： Autocorrelation

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Historical Review of Hydrogen Energy Storage Technology

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World Journal of engineering and Technology 2023年第3期11卷 454-475页

作者： Wilson Fidelis Ekpotu Joseph Akintola Martins Chineme Obialor Udom Philemon Department of Chemical & Petroleum Engineering University of Uyo Akwa Ibom Nigeria Department of Research & Development Vitapur Nigeria Limited Lagos Nigeria Nubyira Process Designer Abuja Nigeria

Hydrogen energy as a sustainable energy source has most recently become an increasingly important renewable energy resource due to its ability to power fuel cells in zero-emission vehicles and its help in lowering the levels of CO2 emissions. Also, hydrogen has a high energy density and can be utilized in a wide range of applications. It is indeed the fuel of the future but, it is still not entirely apparent how to analyze the most successful ways for hydrogen storage based on technological configuration, nature, and efficiency mechanisms. The historical hydrogen storage technologies as they are presented by the current research have been evaluated, analyzed, and examined in this study. The two categories of hydrogen storage systems are physical-based and *** first category involves storing hydrogen as liquid, cold/cryo-compressed, and compressed gas. Chemical sorption/chemisorption and physical sorption/physisorption are the two primary sub-groups of material-based storage, respectively. The quantitative and qualitative analyses of storage technologies for hydrogen are evaluated in this paper. Also, this report reviews the major safety and reliability issues currently facing hydrogen storage systems. Suggestions are made to assist lay the groundwork for future risk and reliability analysis to ensure safe, dependable operation.

关键词： Hydrogen Energy Energy Storage Sustainable Energy Hydrogen Storage Energy Source

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Influence of high-speed impact cutting on the electromagnetic properties of non-oriented electrical steel sheets

Influence of high-speed impact cutting on the electromagneti...

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International Electric Drives Production Conference (EDPC)

作者： Jonas Matt Martin Doppelbauer Process Development Drive Systems Mercedes-Benz AG Stuttgart Germany Institute of Electrical Engineering Karlsruhe Institute of Technology Karlsruhe Germany

The constantly growing requirements for increasing the range of battery electric vehicles and an associated increase in the efficiency of electrical machines for traction drives also pose challenges for manufacturing processes and the selection of suitable processing parameters in the manufacturing chain. High-speed impact cutting (HSIC) has been investigated to a limited extent for electrical steel sheets and represents an essential opportunity to improve the soft magnetic behavior in the cut edge zone. This paper aims to investigate and validate the primary characteristics that result from HSIC on the softmagnetic properties. Accordingly, it is shown and quantified how the degradation of the soft magnetic behavior is formed in the zone affected by shear cutting, with a comparative representation to conventional shear cutting. It is also shown how the secondary properties change as a result of the improved cutting surface quality.

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development and Characterization of Calcium Based Biocomposites Using Waste Material (Calcite Stones) for Biomedical Applications

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Materials Sciences and Applications 2024年第5期15卷 113-135页

作者： Tasmim Adry Nuzhat Tabassum Maisha Md. Abdul Gafur Suraya Sabrin Soshi Maruf Hasan Department of Biomedical Engineering Military Institute of Science and Technology Dhaka Bangladesh Pilot Plant and Process Development Center Bangladesh Council of Scientific and Industrial Research (BCSIR) Dhaka Bangladesh Department of Mechanical Engineering Ahsanullah University of Science and Tecnology (AUST) Tejgaong Dhaka Bangladesh

Calcium-based biocomposite materials have a pivotal role in the biomedical field with their diverse properties and applications in combating challenging medical problems. The study states the development and characterization of Calcium-based biocomposites: Hydroxyapatite (HAP), and PVA-Gelatin-HAP films. For the preparation of Calcium-based biocomposites, an unconventional source, the waste material calcite stone, was used as calcium raw material, and by the process of calcination, calcium oxide was synthesized. From calcium oxide, HAP was prepared by chemical precipitation method, which was later added in different proportions to PVA-Gelatin solution and finally dried to form biocomposite films. Then the different properties of PVA/Gelatin/HAP composite, for instance, chemical, mechanical, thermal, and swelling properties due to the incorporation of various proportions of HAP in PVA-Gelatin solution, were investigated. The characterization of the HAP was conducted by X-ray Diffraction Analysis, and the characterization of HAP-PVA-Gelatin composites was done by Fourier Transform Infrared Spectroscopy, Thermomechanical Analysis, Tensile test, Thermogravimetric Differential Thermal Analysis, and Swelling Test. The produced biocomposite films might have applications in orthopedic implants, drug delivery, bone tissue engineering, and wound healing.

关键词： Hydroxyapatite Calcium-Based Biocomposites PVA-Gelatin Films Drug Delivery Bone Tissue engineering

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Current Gain Reduction in Bipolar Junction Transistors Induced by Carbon Contamination from H3PO4-Based Etchant 34

Current Gain Reduction in Bipolar Junction Transistors Induc...

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34th Annual SEMI Advanced Semiconductor Manufacturing Conference, ASMC 2023

作者： Lik, Tan Chan Ning, Lim Chui Wai, Wan Tatt Johan, Norjuliani Zakaria, Zafirah Cheong, Kuan Yew Infineon Technologies Sdn. Bhd. Procss Integration Kulim09000 Malaysia Unit Process Development Infineon Technologies Sdn. Bhd Kulim Hi-Tech Park Kulim09000 Malaysia University Science Malaysia School of Materials and Mineral Resources Engineering Engineering Campus Pulau Pinang Nibong Tebal14300 Malaysia

ISBN: (纸本)9781665456395

A new mechanism contributed to current gain reduction in Bipolar Junction Transistors that was caused by contamination of H3PO4 during silicon nitride removal has been investigated via various physical analysis and electrical characterization. Based on energy-dispersive X-ray spectroscopy/transmission electron microscopy and X-ray photoelectron spectroscopy results, carbon and carbide related compounds can be detected in the bulk silicon nitride. This may be the possible root cause of low current gain in the transistors. © 2023 IEEE.

关键词： Carbides

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Characterization of the Three-dimensional Pore Structure of Coke Using the Maximal Ball Method

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ISIJ International 2025年第3期65卷 360-371页

作者： Igawa, Daisuke Matsuo, Shohei Matsushita, Yohsuke Aoki, Hideyuki Hayashizaki, Hideyuki Saito, Yasuhiro Department of Chemical Engineering Graduate School of Engineering Tohoku University 6-6-07 Aoba Aramaki Aoba-ku Sendai Miyagi980-8579 Japan Department of Sustainable Energy Hirosaki University 3 Bunkyo-cho Hirosaki Aomori036-8651 Japan Coal & Coke Research Department Ironmaking Research Laboratory Process Research Laboratories Research & Development Nippon Steel Corporation 20-1 Shintomi Futtsu Chiba293-8511 Japan Department of Applied Chemistry Kyushu Institute of Technology 1-1 Sensui-cho Tobata Kitakyushu Fukuoka804-8550 Japan

The three-dimensional pore structure and strength characteristics of two types of coke, Coke CC (produced from caking coal) and Coke LC (produced from low-quality coal), were assessed employing the maximal ball (MB) method and the finite element method (FEM). The MB analysis showed that Coke LC demonstrated larger and more connected pores, characterized by a higher coordination number, indicating greater pore connectivity. The FEM stress analysis showed that Coke LC displayed a less uniform matrix, leading to localized stress concentrations and increased anisotropy in the elastic modulus. These findings indicate that the lower drum strength of Coke LC is because of its nonuniform pore structure and higher susceptibility to stress concentration. Multiple regression analysis confirmed that pore connectivity, quantified by the coordination number, significantly impacts coke strength, with higher coordination numbers (greater than 8) being associated with increased elastic modulus. These results underscore the importance of a uniform, highly interconnected pore structure in enhancing coke strength, offering valuable insights for optimizing coke production to improve its mechanical properties. © 2025 The Iron and Steel Institute of Japan.

关键词： Coke

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An Empirical Study on Thermal Efficiency and Dusty Moisture Removal Efficiency Using Enthalpy Wheel in Industrial Waste Incineration Plant

SSRN

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SSRN 2024年

作者： Kim, Young Bae Park, Hyosoon Kim, Yulki Plant Process Development Center Institute for Advanced Engineering Gyeonggi-do 17180 Korea Republic of Department of Environmental Business Chosun Refractories Engineering Co. Ltd. Seoul06609 Korea Republic of

In this study, empirical study was conducted on waste heat recovery and moisture reduction of enthalpy wheel in industrial waste incineration plant. The enthalpy wheel used a metal medium filter element, and the high-temperature exhaust gas of 200℃ from the rear of the dust collector flowed into the enthalpy wheel. In the enthalpy wheel, exhaust gas and external air are heat exchanged in a form of counter flow, and the condensation effect is maximized by installing a water spray nozzle at the inlet of the exhaust gas. Empirical data gathered over 100 days, spanning from July to October. To evaluate the performance, thermal efficiency, moisture removal efficiency, and dust removal efficiency are tested under high-temperature humid condition. In some results, the overall thermal efficiency reached its highest at 61.2%. Regarding moisture removal performance, the average moisture removal rate was 493 kg/h, achieving an efficiency of 49.2%. In dust removal performance, the average dust removal efficiency is 79.6%. © 2024, The Authors. All rights reserved.

关键词： Waste heat utilization

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Stress release mechanism of deep bottom hole rock by ultra-high-pressure water jet slotting

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Petroleum Science 2023年第3期20卷 1828-1842页

作者： Hua-jian Wang Hua-Lin Liao Jun Wei Jian-Sheng Liu Wen-Long Niu Yong-Wang Liu Zhi-Chuan Guan Hedi Sllami John-Paul Latham School of Petroleum Engineering at China University of Petroleum East China QingdaoShandong266580China Key Laboratory of Unconventional oil and Gas Development Ministry of EducationQingdaoShandong266580China Shandong Ultra-deep Drilling Process Control Tech R&D Center QingdaoShandong266580China MINES Paris Tech PSLResearch Universty Geociences Rearch Centerbd Saint MicheParisFrance VAEL Euroe2 rue Johannes Keple 64000PauFrance Earth Science and Engineering Imperial College LondonLondonSW72AzUnited Kingdom

To solve the problems of rock strength increase caused by high in-situ stress,the stress release method with rock slot in the bottom hole by an ultra-high-pressure water jet is *** stress conditions of bottom hole rock,before and after slotting are analyzed and the stress release mechanism of slotting is *** results show that the stress release by slotting is due to the coupling of three factors:the relief of horizontal stress,the stress concentration zone distancing away from the cutting face,and the increase of pore pressure caused by rock mass expansion;The stress concentration increases the effective stress of rock along the radial distance from O.6R to 1R(R is the radius of the well),and the presence of groove completely releases the stress,it also allows the stress concentration zone to be pushed away from the cutting face,while significantly lowering the value of stresses in the area the drilling bit acting,the maximum stress release efficiency can reach 80%.The effect of slotting characteristics on release efficiency is obvious when the groove location is near the borehole *** the increase of groove depth,the stress release efficiency is significantly increased,and the release range of effective stress is enlarged along the axial ***,the stress release method and results of simulations in this paper have a guiding significance for best-improving rock-breaking efficiency and further understanding the technique.

关键词： Hard rock Slotting Stress release Down hole pressures Poroelastic mechanics Fluid-structure Interaction Ultra-high-pressure water jet

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