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Novel Structural Aspects of Heavy-Crude-derived Asphaltene Molecules for Investigating the Crude Mix Processability in refinery Operation

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SPE Journal 2023年第3期28卷 1510-1527页

作者： das, raj K. Voolapalli, ravi K. Upadhyayula, Sreedevi Kumar, rajeev Corporate R&D Centre Bharat Petroleum Corporation Ltd India Department of Chemical Engineering Indian Institute of Technology Delhi India

In this paper, we investigate the role of asphaltenes derived from heavy crudes, which dictates the behavior of crude mix properties for hassle-free downstream refinery operation. Combined characterization techniques such as proton nuclear magnetic resonance (1H-NMr), cross-polarization magic-angle-spinning carbon-13 (CP/MAS 13C)-NMr, heteronuclear single-quantum coherence (HSQC), Fourier transform infrared (FTIr), thermogravimetric analysis (TGA), and X-ray diffraction (Xrd) are used for the detailted study of ratwai and ras Gharib (rG)-derived asphaltenes to validate their structural role in selecting the optimal crude mix. As per our investigation, when the polyaromatic core of asphaltene structures are less substituted, the availability of aromatic hydrogen is more;it exhibits a stable crude mix as compared to heavy crudes that have more aromatic core substitution, despite the crudes possessing similar asphaltene content and physicochemical properties. This finding is further extended to West Canadian (WC) and Belayim (BL) heavy crudes for operational suitability. In this study, the key feature is to develop a CP/MAS 13C-NMr-based robust and quick characterization technique that could potentially become a prescreening method to assess crude oil compatibility and its various blend processability in the refinery system. Other characterization techniques, such as 1H-NMr, HSQC, FTIr, TGA, and Xrd, would corroborate and confirm the reliability of the data obtained by CP/MAS 13C-NMr. Copyright © 2023 Society of Petroleum Engineers.

关键词： Asphaltenes

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STUdY ON ENErGY SAVING POTENTIAL OF ELECTrIC HEATErS IN rESIdENTIAL HOUSES BASEd ON THE ANALYSIS OF HOME ENErGY MANAGEMENT SYSTEM dATA

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AIJ Journal of technology and design 2024年第75期30卷 844-849页

作者： Mao, Serikawa Seiichi, Kashihara Atsumasa, Yoshiura Faculty of Architecture and Building Engineering Kanagawa Univ. Dr.Eng. Japan Faculty of Architecture and Building Engineering Kanagawa Univ. Dr.Eng. Japan Architectural Technology Dept. R&D Centre Asahi Kasei Homes Corporation Japan

A large proportion of energy consumption in Japan is attributable to houses, and that of household appliances is not negligible. However, as the Energy Conservation Act in Japan does not cover household appliances such as electric heating devices, sufficient measures for energy saving of household appliances are not provided. In this study, by analyzing HEMS (home energy management system) data, we have surveyed the power consumption of electric heating devices, bathroom heaters, and other appliances in recently built houses in Tokyo and Kanagawa prefectures. In addition, we have estimated the effect of equipment replacement into high-efficiency ones. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Energy conservation

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Application of Optical Visualization Method in Observing Flow Field Around a Cylinder

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Journal of Harbin Institute of technology(New Series) 2023年第2期30卷 12-24页

作者： Hongbo Wang Chaohe Chen Naval Architecture and Ocean Engineering R&D Centre of Guangdong Province South China University of TechnologyGuangzhou 510641China School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China

In this paper, a free-surface synthetic schlieren(FS-SS) method was performed to detect the free surface disturbances. It is a purely optical method that uses refraction of light to reconstruct the height changes of water surface. The theory was developed based on Moisy's research, but has mainly been used in small-scale applications like painting and coating industry. Based on the methods and theories of the literature review, an in-depth investigation was conducted to optimize the FS-SS method and verify its feasibility on a relatively large-scale(e.g., wake region of shallow flow). The experimental setup was simplified which is approachable in most laboratories. Through proper experimental setting and an optimized post-processing routine, the quality of image was highly improved and ensured the accuracy of results. A drop test was performed proving the continuity of FS-SS method in the time domain. Also, a comparison test with flow around a cylinder at two speeds showed the ability of FS-SS method to reconstruct the irregular water surface in relative large-scale flow structures.

关键词： FS-SS flow around cylinder water height detection

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Optimization of High Voltage and Large Capacity Circuit Breakers Based on Parallel Flow Field Calculation 13

Optimization of High Voltage and Large Capacity Circuit Brea...

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13th International Conference on Power and Energy Systems, ICPES 2023

作者： Zhang, Hao Wang, Zhijun Song, Yunlei Li, Miaoxin Liu, Yapei Yao, Yongqi Pinggao Group Co. Ltd R&d Centre Pingdingshan China Shenyang University of Technology School of Electric Engineering Shenyang China

ISBN: (纸本)9798350345063

In the process of high-voltage circuit breaker breaking, the arc extinguishing chamber is a complex multi-field coupling physical process, and the simulation technology of the flow field in the arc extinguishing chamber is the core technology of circuit breaker design. The early simulation technology of airflow field in arc extinguishing chamber uses single core calculation, which takes a long time and cannot meet the requirements of product development cycle. Based on the arc mathematical model, this paper developed the parallel simulation technology of the gas field in the arc extinguishing chamber, analyzed the calculation results of the pressure and temperature of the arc extinguishing chamber under the typical short-circuit breaking condition. The influence of different nozzle throat diameters on the airflow field of high-voltage and large-capacity interrupter was studied, and the optimization direction of the interrupter structure was determined to complete the product optimization design. © 2023 IEEE.

关键词： Flow fields

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Optimizing Wireless Coverage: The Impact of Signal Enhancers on Current and Future Wireless Communication Systems 10

Optimizing Wireless Coverage: The Impact of Signal Enhancers...

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10th IEEE Asia-Pacific Conference on Applied Electromagnetics, APACE 2024

作者： Bujang, Suhandi Alias, Mohamad Yusoff Marzuki, Azah Syafiah Mohd Salleh, Abdullah Bin Muhammad, Surajo Nor, Mohd Hafiz Mohamad TM R&D Sdn Bhd Centre for Intelligent Network Cyberjaya Malaysia Multimedia University Faculty of Engineering Cyberjaya Malaysia Telekom Malaysia Mobile Technology Division Kuala Lumpur Malaysia

ISBN: (纸本)9798350364163

The rapid growth of wireless communication requires solutions to address coverage gaps and improve network performance. Signal enhancement technologies like repeaters, distributed Antenna Systems (dAS) and reconfigurable Intelligent Surfaces (rIS) are crucial for boosting coverage in current and future wireless communication networks. This paper briefly discusses recent advancements in these technologies and presents case studies demonstrating how LTE Tdd repeater improve both indoor and outdoor coverage. results show that indoor downlink and uplink throughput increased to over 35 Mbps and 10Mbps, while outdoor downlink and uplink performance reached 30 Mbps and 3 Mbps, respectively. These results prove the repeater's effectiveness in enhancing signal coverage and network performance. © 2024 IEEE.

关键词： Smart antennas

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Partial discharge Performance Analysis of Carbon Quantum dots Modified Mineral oil

Partial Discharge Performance Analysis of Carbon Quantum Dot...

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2023 Innovations in Power and Advanced Computing Technologies, i-PACT 2023

作者： Madhumathi, r.M. Chandrasekar, S. Electrical and Electronics Engineering Faculty of Engineering Er.Perumal Manimegalai College of Engineering Hosur India SonaPERT R&D Centre Electrical and Electronics Engineering Sona College of Technology Salem India

ISBN: (纸本)9798350325188

Mineral oil is commonly used as an insulating medium in power transformers and other high-voltage equipment. It exhibits good insulating properties and provides cooling for the equipment. However, over time, mineral oil can undergo ageing processes due to factors such as temperature, oxidation, and contamination, which can affect its performance and electrical properties. CQd-SiO2 (Carbon Quantum dot-Silicon dioxide) is a compound containing quantum dots (Qds) embedded in a silicon dioxide (SiO2) matrix. These quantum dots subsist nanoscale semiconducting particles that can exhibit unique electrical and optical properties. When mineral oil is used as an insulating medium in conjunction with CQd-SiO2 nanoparticles, the ageing process can affect the partial discharge characteristics which in turn reduces the efficiency. Partial discharge (Pd) is the portion of the discharge that occurs in electrical insulating materials. This paper investigates the partial discharge (Pd) characteristics by changing the concentration of carbon quantum dots (CQds- Sio2) in mineral oil. © 2023 IEEE.

关键词： carbon quantum dots Mineral oil Partial discharge Silicon di oxide

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WhaleOptNB: A Method for Automated Biomedical Text document Classification 7th

WhaleOptNB: A Method for Automated Biomedical Text Document ...

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7th International Conference on Intelligent Computing and Optimization, ICO 2023

作者： Kumar, S. Vishnu Chohan, Jasgurpreet Singh Kalita, Kanak Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology Avadi600062 India Department of Mechanical Engineering and University Centre for Research & Development Chandigarh University Mohali140413 India Department of Mechanical Engineering Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology Avadi600062 India Jadara University Research Center Jadara University Irbid Jordan

ISBN: (纸本)9783031733239

In recent years, there has been a meteoric rise in the amount of digital information stored in the biomedical industry due to the rapid growth of the internet and other information technologies. Automated biomedical text classification has become an effective and robust method of accessing the increased amount of technical and medical literature in the biomedical sector through the classification of multiple source documents while preserving the significantly informative data to manage the enormous amount of biomedical data currently available. This is accomplished by automating the classification of multiple source documents in the biomedical field. Therefore, multi-document biomedical text classification plays an essential role in resolving the problem of gaining access to accurate and up-to-date information. A Whale Optimization Algorithm-based Weighted Naive Bayes Classifier (WhaleOptNB) for text document classification is proposed. A biomedical text document dataset is collected and preprocessed. Then, the preprocessed data's features are extracted using the Term Frequency-Inverse document Frequency (TF-IdF). To classify the biomedical text document, WhaleOptNB is utilized. To prove the efficiency of the proposed methodology, it is compared with existing methods. Simulation results show that the proposed method outperforms conventional methods. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Inverse problems

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Structural, morphological and anti - bacterial activities of pure SnO2 nanoparticles prepared by chemical precipitation method

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Materials Today: Proceedings 2023年 73卷 535-538页

作者： Abirami, S. Viruthagiri, G. Ashokkumar, K. Department of Physics R&D centre Bharathiar University Tamilnadu Coimbatore India Department of Physics Annamalai University Annamalainagar Tamilnadu Chidambaram 608 002 India Department of Physics V.R.S college of Engineering and Technology Arasur 607107 Tamilnadu Villupuram India

The tin oxide (SnO2) nanopowders were synthesized by a simple chemical method (precipitation). The sample was studied for Xrd, FESEM, and EdX analyses. The Xrd results of synthesized SnO2 nanoparticles exhibited a tetragonal structure with an average crystallite size of 18.79 nm. The FE-SEM exhibited the microstructure of the prepared nanoparticles. The FESEM images reveal that the shape of the prepared product wasspherical. The impact of SnO2 NPs on food and water poisoning growth was investigated with the help of antibacterial activities. This paper deals with the properties and applications of tin oxide nanostructures. Antibacterial activity was carried out against three bacterial strains: Bacillus subtilis, Escherichia Coli, and Pseudomonas aeruginosa. © 2022

关键词： Tin oxides

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CHEMICAL COMPOSITION ANd ANTIMICrOBIAL ACTIVITY OF VErBENA OFFICINALIS ANd ALOYSIA CITrOdOrA EXTrACTS OBTAINEd BY TrAdITIONAL ANd LABOrATOrY METHOdS

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UPB Scientific Bulletin, Series B: Chemistry and Materials Science 2024年第3期86卷 111-122页

作者： Stancu, Alina-Ionela Geană, Elisabeta Irina ditu, Lia-Mara Ficai, Anton Nagoda, Eugenia Oprea, Eliza Department of Science and Engineering of Oxide Materials and Nanomaterials National University of Science and Technology POLITEHNICA Bucharest Romania National R&D Institute for Cryogenics and Isotopic Technologies – ICIT Râmnicu Vâlcea Romania Department of Microbiology and Immunology University of Bucharest Romania National Centre for Micro and Nanomaterials and National Centre for Food Safety National University of Science and Technology POLITEHNICA Bucharest Romania Academy of Romanian Scientists 3 Ilfov Street Bucharest050045 Romania Garden "D. Brandza" University of Bucharest Romania

The present study compares traditional and laboratory extraction methods applied to two plants from the Verbenaceae family, aiming for phenolic compound valorization. The decoction, and maceration were used as traditional methods, while alcoholic and water extractions were accomplished in laboratory conditions. The chemical composition of the Verbena officinalis and Aloysia citrodora extracts was established for the first time, from our knowledge, by Ultra-High-Performance Liquid Chromatography-Electrospray Ionization-High-resolution Mass Spectrometry. The alcoholic extracts (obtained traditionally and in the laboratory) of both plants had remarkable antimicrobial activity both on planktonic cells and on biofilms. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Electrospray ionization

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Structural Electrochemical Characteristics of GO, ZnO and GO/ZnO Nanocomposite for detecting Sulfamethoxazole in Tablet 3

Structural Electrochemical Characteristics of GO, ZnO and GO...

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3rd International Conference on Electrical, Electronics, Information and Communication Technologies, ICEEICT 2024

作者： Padmalaya, G. Athmanesan, T. Senthilkumar, P. Vel Tech Rangarajan Dr. Sagunthala R&d Institute of Science and Technology School of Electrical and Communication Department of Electronics and Communication Engineering Tamil Nadu Avadi600062 India Pondicherry University Government of India Centre for Pollution Control and Environmental Engineering School of Engineering and Technology Puducherry Kalapet605014 India

ISBN: (数字)9798350369083

ISBN: (纸本)9798350369083

In this research work, a GO-ZnO nanocomposite-based electrochemical sensor was used as a modified electrode for enhanced electrochemical behavior. The electrochemical sensor characteristics were analyzed using cyclic and impedance voltammetry. Cyclic voltammetry confirmed the electrochemical behavior of the modified electrode. The cyclic voltammograms for GO, ZnO and GO-ZnO nanocomposite were investigated, and observed that peaks are highly independent on behavioral potential peaks. Their physio-chemical characteristics were analyzed using X-ray diffraction (Xrd) analysis and Hr-scanning electron Microscopy. On examining the electrochemical characteristics of obtained nanomaterials found to exhibit its behavior towards electrochemical sensor applications for detecting sulfamethoxazole. © 2024 IEEE.

关键词： Cyclic voltammetry

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