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4th International Conference on Expert Clouds and Applications, ICOECA 2024

作者： Aancy, H. Mickle Mary, S. Anitha Janet Manikumar, T. Saravanan, G. Mohanavel, V. Gupta, Rahul Dev Panimalar Engineering College Department of Management Studies Tamil Nadu Chennai600123 India Noorul Islam Centre for Higher Education Department of Electrical and Electronics Engineering Tamil Nadu Kumaracoil629180 India Kalasalingam Academy of Research and Education Deemed to be University Department of Computer Science and Engineering Tamil Nadu 626126 India KPR Institute of Engineering and Technology Department of Electrical and Electronics Engineering Tamil Nadu Coimbatore641407 India Centre for Materials Engineering and Regenerative Medicine Bharath Institute of Higher Education and Research Tamil Nadu Chennai600073 India Department of Mechanical Engineering Haryana 133207 India

ISBN: (纸本)9798350385793

Efficient energy management requires a thorough understanding of individual appliance energy consumption in both residential and business environments. Because of the growing number of Internet of Things (loT) devices in smart homes, household appliances are a significant source of total energy consumption. Commonly used equipment such as heating systems, washing machines, and vacuum cleaners have a substantial impact on daily energy consumption. Significant energy savings can only be realized by careful management and forecasting of these appliances' energy consumption. This research employs Recurrent Neural Network (RNN) models for energy forecasting of housing appliances, with Long Short-Term Memory (LSTM) and a hybrid model known as Bi-LSTM-Attention Network. A Kaggle dataset with 28 features is used in this study, which is then reduced to 17 using a correlation plot. The processed data is used in both the training and testing phases of the RNN models. Many metrics are used to evaluate the performance of the models, including R-squared (R2), Mean Squared Error (MSE), and Root Mean Squared Error (RMSE). The Bi- LSTM-Attention Network achieves excellent performance, with training and testing R2 values of 0.9978 and 0.9835, respectively. In addition, lower MSE and RMSE values demonstrate that Bi-LSTM-Attention Network constantly outperforms LSTM. The findings show that the proposed Bi-LSTM-Attention Network is capable of accurately predicting the amount of energy household appliances will consume. © 2024 IEEE.

关键词： Long short-term memory

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Passive on-chip isolators based on the thin-film lithium niobate platform

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Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang Keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

Optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Graphene-driving strain engineering to enable strain-free epitaxy of AlN film for deep ultraviolet light-emitting diode

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Light(science & Applications) 2022年第5期11卷 808-819页

作者： Hongliang Chang Zhetong Liu Shenyuan Yang Yaqi Gao Jingyuan Shan Bingyao Liu Jingyu Sun Zhaolong Chen Jianchang Yan Zhiqiang Liu Junxi Wang Peng Gao Jinmin Li Zhongfan Liu Tongbo Wei Research and Development Center for Semiconductor Lighting Technology Institute of SemiconductorsChinese Academy of Sciences100083 BeijingChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences100049 BeijingChina Center for Nanochemistry(CNC) Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking University100871 BeijingChina Electron Microscopy Laboratory and International Center for Quantum MaterialsSchool of PhysicsPeking University100871 BeijingChina Beijing graphene institute(BGI) 100095 BeijingChina Academy for Advanced Interdisciplinary Studies Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced MaterialsPeking University100871 BeijingChina State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences100083 BeijingChina

The energy-efficient deep ultraviolet(DUV)optoelectronic devices suffer from critical issues associated with the poor quality and large strain of nitride material system caused by the inherent mismatch of *** this work,we have prepared the strain-free AlN film with low dislocation density(DD)by graphene(Gr)-driving strain-pre-store engineering and a unique mechanism of strain-relaxation in quasi-van der Waals(QvdW)epitaxy is *** DD in AlN epilayer with Gr exhibits an anomalous sawtooth-like evolution during the whole epitaxy *** can help to enable the annihilation of the dislocations originated from the interface between AlN and Gr/sapphire by impelling a lateral two-dimensional growth ***,it can induce AlN epilayer to pre-store sufficient tensile strain during the early growth stage and thus compensate the compressive strain caused by ***,the low-strain state of the DUV light-emitting diode(DUV-LED)epitaxial structure is realized on the strain-free AlN template with ***,the DUV-LED with Gr demonstrate 2.1 times enhancement of light output power and a better stability of luminous wavelength compared to that on bare *** in-depth understanding of this work reveals diverse beneficial impacts of Gr on nitride growth and provides a novel strategy of relaxing the vital requirements of hetero-mismatch in conventional heteroepitaxy.

关键词： sapphire diode strain

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Effect of exposure to a light-emitting diode (LED) on the physicochemical characteristics of natural latex biomembranes used to treat diabetic ulcers

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Research on Biomedical engineering 2022年第3期38卷 901-911页

作者： Santana, Thamis Fernandes Oliveira, Rebeca Hannah de Melo dos Santos, Ludmila Evangelista Lima, Eunice Paloma Nascimento Faria, Sylvia de Sousa Fonseca, Marcos Augusto Moutinho da Silva, Jaqueline Rodrigues Tatmatsu-Rocha, José Carlos Gomes, Marília Miranda Forte Fleury Rosa, Mário Fabrício Fleury Rosa, Suélia de Siqueira Rodrigues Carneiro, Marcella Lemos Brettas Postgraduate Program in Biomedical Engineering University of Brasilia Federal District Brasilia Brazil Postgraduate Program in Materials Science and Engineering Federal University of Campina Grande Paraiba Campina Grande Brazil Department of Electrical Engineering University of Brasilia Federal District Brasilia Brazil Postgraduate Program in Biology Animal University of Brasilia Federal District Brasilia Brazil Medicine Faculty Physical Therapy Department Federal University of Ceara Ceara Fortaleza Brazil Postgraduate Technology and Health Program University of Brasília Federal District Brasília Brazil

Purpose: Natural latex biomembrane has shown high therapeutic potential for the treatment of diabetic ulcers when associated with phototherapy. In this study, physical and chemical alterations in the latex biomembranes were evaluated after exposure to light-emitting diode (LED) irradiation and after contact with NaCl solution. Methods: There were three experimental groups: natural latex biomembranes (1) in natura;(2) after 35 min of LED light irradiation;and (3) after immersion in NaCl 0.9 g% solution. The samples were analyzed by tensile strength test, thermogravimetry, contact angle wettability, and Fourier-transform infrared spectroscopy. Results: The biomembranes that were submitted to contact with NaCl aqueous solution or exposure to LED did not undergo impairment of mechanical resistance. The thermogravimetry analysis indicated that increasing temperature led to mass loss in all samples, referring to their decomposition temperatures. In the wettability test, biomembranes exposed to LED showed a significant reduction in the contact angle between 0 and 10 min, indicating an increase in hydrophilicity, suggesting water storage capacity. The Fourier-transform infrared spectrometry assay showed that there was a more significant reduction in vibration intensity after immersion in NaCl solution compared to untreated biomembranes. An increase in the intensity of the entire spectrum of biomembranes exposed to LED was observed in comparison with the other samples, which may be related to photodegradation caused by LED light irradiation. Conclusion: The biomembranes underwent significant changes in its chemical structure after being subjected to different types of exposure and maintained its elasticity and tensile strength properties, in addition to showing good water retention capacity after exposure to LED. Thus, it maintains many of its properties for application as a tissue-regenerating biomaterial, even when subjected to LED irradiation and a humid environment. © 20

关键词： Tissue regeneration

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Fabrication of Zn-Ni Alloy Columns with Low Hydrogen Evolution Overpotential as Efficient Electrocatalyst for H2 Production

Fabrication of Zn-Ni Alloy Columns with Low Hydrogen Evoluti...

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IEEE Conference on Nanotechnology

作者： Yao-Tien Tseng Russell Clemente Jing-Chie Lin Institute of Materials Science and Engineering National Central University Taoyuan Taiwan International Master Program in Applied Materials Science National Central University Taoyuan Taiwan

In this study, steric Zn-Ni alloy columns were fabricated via microanode-guided electroplating (MAGE), which had a very small electrode gap (90 µm) and a very high deposition rate (> 2 µm/min). These microcolumns were used to produce hydrogen by the electrocatalytic decomposition of water in alkaline aqueous solutions of 1 M KOH. The surface morphology study was acquired via the SEM, and after numerous electrocatalytic reactions, the porous structure of the Zn-Ni alloy progressively developed on the surface. The amount of zinc present in the alloy fell from 91 at. % to 52 at. %, which resulted in the column diameter of Zn-Ni increasing from 248 to 300 µm. After conducting an XRD investigation, the primary structure of the Zn-Ni alloy microcolumn was determined to be that of an intermetallic compound belonging to the Zn-Ni series. The phases shifted from Ni 3 Zn 22 to Ni 2 Zn 11 and NiZn 3 when the percentage of zinc in the alloy decreased from 91 to 52 at. %. The results of the linear sweep voltammetry showed that the Zn-Ni alloy microcolumns exhibited good hydrogen production efficiency at 13–24 at.% Ni, the lowest Tafel slope of 45 mV/dec, and only 36 mV overpotential when operating at 10 mA/cm 2 current density. Because of the enormous number of nano-networked nickel hydroxide on the surface that was investigated by TEM, the excellent efficiency with which hydrogen was produced can be attributed to the fact that this resulted in a significant increase in the amount of electrochemical surface area available.

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Development of educational software for stainless steel selection and evaluating usability using the System Usability Scale (SUS)

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International Journal of Mechanical engineering Education 2024年

作者： Nery, Macclarck Pessoa dos Santos Neto, Severiano José Alves, Roberty Santos Santana, João Vitor dos Santos Griza, Sandro Martins, Carlos Otávio Damas Materials Science and Engineering Pos-graduation Program – p2cem from Federal University of Sergipe São Cristovão City Brazil Mechanical Engineering Department Federal University of Sergipe São Cristovão City Brazil Department of Materials Science and Engineering Federal University of Sergipe São Cristovão City Brazil

The use of educational technologies is an important part of the learning process. The development of educational apps and software is one of the pillars of this evolution in teaching. Material selection is one of the most important subjects in professional engineering education. Regarding materials used to manufacture products, the stainless steels are the most commonly used materials after traditional steels. In the industrial environment, fatigue, corrosion-fatigue, and stress corrosion cracking are three very important considerations in the selection of materials. This study evaluates the usability of educational software developed in Java using object-oriented programming using the System Usability Scale and compares it with results obtained from other educational technologies. © The Author(s) 2024.

关键词： Software testing

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Exotic surface magnetotransport phenomena in the antiferromagnetic Mott insulator NiS2

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Physical Review materials 2023年第10期7卷 104401-104401页

作者： Sami El-Khatib Faisal Mustafa Mehmet Egilmez Bhaskar Das Yu Tao Moumita Maiti Yeon Lee Chris Leighton Department of Physics American University of Sharjah Sharjah PO Box 26666 United Arab Emirates Materials Science and Engineering Program American University of Sharjah Sharjah PO Box 26666 United Arab Emirates Department of Chemical Engineering and Materials Science University of Minnesota Minneapolis Minnesota 55455 USA

The pyrite-structure transition-metal disulfide NiS2 is in principle a model cubic antiferromagnetic Mott insulator that can be doped through insulator-metal transitions with both electrons and holes (in Ni1–xCuxS2 and Ni1–xCoxS2), eventually inducing superconductivity and ferromagnetism, respectively. Magnetism and transport have proven challenging to understand in NiS2, however. The antiferromagnetic spin structure below ∼39K is complex due to frustration, while unexplained weak ferromagnetism emerges below ∼30K. Surface conduction is also now understood to dominate in NiS2 at low temperatures, raising questions about the interpretation of decades of prior data. Here, we present a complete study of the surface magnetotransport phenomena that emerge at low temperatures in high-quality single-crystal NiS2, which turn out to be strikingly rich. On cooling, isotropic magnetoresistance due to a field-induced shift of the first-order weak ferromagnetic ordering transition is first uncovered, i.e., metamagnetic magnetoresistance. At lower temperatures, larger, anisotropic magnetoresistance effects arise due to distinct switching events associated with the weak ferromagnetism. Strong evidence is presented that this is due to a field-driven in-plane to out-of-plane reorientation of surface spins, likely correlated with surface steps and terraces. In-plane exchange bias accompanies these effects, further supporting this interpretation. At the lowest temperatures, the spin reorientation field eventually exceeds the 9-T measurement window, generating strongly field-asymmetric magnetoresistance. Some of these unusual phenomena also manifest in the Hall channel, culminating in a sizable anomalous Hall effect at low temperatures. These results significantly demystify recent magnetoresistance and magnetic microscopy observations in NiS2 crystals and nanoflakes, and constitute an important step in elucidating the complex electronic and magnetic properties of this pivotal antiferro

关键词： Electrical properties Electronic structure Magnetism Antiferromagnets Ferromagnets Mott insulators Magnetic techniques Transport techniques

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Vibrational entropies of oxygen vacancy formation in metal oxides

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Physical Review materials 2024年第5期8卷 055407-055407页

作者： Bianca Baldassarri Jiangang He Christopher Wolverton Graduate Program in Applied Physics Northwestern University Evanston Illinois 60208 USA Department of Materials Science and Engineering Northwestern University Evanston Illinois 60208 USA

Oxygen vacancies play a key role in many energy-related applications, and the investigation of the thermodynamic forces driving their formation across different materials can be tackled through the use of ab initio methods. In this context, however, computational studies targeting finite-temperature properties such as entropy remain scarce. Wider-ranging studies are of interest to deepen the understanding of the role of the entropy of oxygen vacancy formation and its different components in processes like the ones involved in solar thermochemical hydrogen (STCH) production, and to investigate the existence of common trends and differences between materials. In this work, we use density functional theory and harmonic phonon calculations to compute the vibrational entropy of oxygen vacancy formation (ΔSvib) for 10 different metal oxide compounds. The computation is carried out by taking the difference between the vibrational entropy of a vacancy-containing and a pristine structure, while the entropic contribution from the final gaseous state of the oxygen lost from the material is accounted for separately with a gas entropy term. We first examine the temperature dependence of ΔSvib and highlight the presence of an initial peak around room temperature, followed by a steady decrease resulting from the presence of an additional O atom (the one becoming vacant) in the defect-free structure. We then inspect the atomic contributions to ΔSvib, and highlight similarities and differences between compounds. Finally, we consider other significant sources of entropy, and find ΔSvib to provide a smaller, yet non-negligible, contribution to the total entropy of vacancy formation. We also compare the temperature dependence of ΔSvib to that of the gas entropy, and show that the two largely counterbalance each other at high temperatures.

关键词： Entropy Hydrogen production Density functional theory

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Improving self-healing characteristics of polyurethane composite coatings by surface modification of polyaniline using dodecylamine

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engineering Failure Analysis 2025年 176卷

作者： Ahmad, Shoaib Nawaz, Muddasir Mohammad, Solaiman Al-Qahtani, Noora Kahraman, Ramazan Mansoor, Bilal Shakoor, R.A. Qatar University Doha2713 Qatar Materials Science & Technology Program College of Arts & Sciences Qatar University Doha2713 Qatar Department of Mechanical and Industrial Engineering Qatar University Doha2713 Qatar Department of Chemical Engineering College of Engineering Qatar University Doha2713 Qatar Qatar University Doha2713 Qatar Department of Materials Science and Engineering Texas A&M University College Station United States

Corrosion is one of the most critical problems affecting the structural integrity of metals. Polymeric nanocomposite coatings reinforced with anti-corrosive pigments are currently being used to mitigate corrosion. This study involves the synthesis of polyaniline (PANI) nanoparticles and their modification with dodecylamine (DOC), which functions as a corrosion inhibitor. Polyurethane coatings (PU-PANI@DOC) were developed by incorporating modified nanoparticles (PANI@DOC) into the polyurethane matrix, and blank polyurethane coatings (PU-blank) were prepared without any nanoparticles. Fourier-transform infrared spectroscopy (FTIR), Transmission electron microscopy, and Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX) analysis confirmed the successful modification of dodecylamine (DOC) with the surface of polyaniline (PANI) nanoparticles. The electrochemical impedance spectroscopy (EIS) and salt spray test (SST) revealed that the impedance values of the modified coating follow an inclined trend (1010 Ω.cm2) in comparison with PU-blank coatings (107 Ω.cm2) after the 14th day of immersion in 3.5 wt% NaCl. Moreover, the hydrophobic characteristics of PANI@DOC nanoparticles shift the contact angle from 60° to 90°, thus lowering the wettability nature of modified coatings. Overall, Polyurethane coatings (PU-PANI@DOC) exhibiting potential attributes such as barrier properties, hydrophobic nature, inhibition effect, and high compatibility with polyurethane matrix can be a suitable material for the development of smart self-healing coatings to protect the metals from the hostile effects of corrosion. © 2025 Elsevier Ltd

关键词： Fourier transform infrared spectroscopy

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Interfacial challenges for all-solid-state batteries based on sulfide solid electrolytes

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Journal of Materiomics 2021年第2期7卷 209-218页

作者： Shuo Wang Ruyi Fang Yutao Li Yuan Liu Chengzhou Xin Felix H.Richter Ce-Wen Nan State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China Materials Science and Engineering Program and Texas Materials Institute The University of Texas at AustinAustinTX78712United States Institute of Physical Chemistry&Center for Materials Research Justus-Liebig-University GiessenHeinrich-Buff-Ring 17D-35392GiessenGermany State Key Laboratory of Bio-fibers and Eco-textiles Institute of Biochemical EngineeringCollege of Materials Science and EngineeringQingdao UniversityQingdao266071China

Sulfide solid electrolytes(e.g.,lithium thiophosphates)have the highest room-temperature ionic conductivity(-10^(-2) S cm^(-1))among solid Li-ion conductors so far,and thus have attracted ever-increasing attention for high energy-density and safety all-solid-state batteries(ASSBs).However,interfacial issues between sulfide electrolytes and electrodes have been the main challenges for their applications in *** interfacial instabilities would occur due to side reactions of sulfides with electrodes,poor solid-solid contact,and lithium dendrites during charge/discharge *** this review,we analyze the interfacial issues in ASSBs based on sulfide electrolytes,and in particular,discuss strategies for solving these interfacial issues and stabilize the electrode-electrolyte ***,a perspective of the interfacial engineering for sulfide-based ASSBs is provided.

关键词： Sulfide solid electrolytes Interfacial engineering All-solid-state batteries Li-metal protection

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