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arXiv 2023年

作者： Zhang, Jie Mendes, Saulo Benoit, Michel Kasparian, Jérôme State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian116023 China Group of Applied Physics University of Geneva Rue de l’École de Médecine 20 Geneva1205 Switzerland Institute for Environmental Sciences University of Geneva Boulevard Carl-Vogt 66 Geneva1205 Switzerland Chatou France Saint-Venant Hydraulics Laboratory LHSV École des Ponts EDF R&D Chatou France

The impact of shoaling on linear water waves is well-known, but it has only been recently found to significantly amplify both the intensity and frequency of rogue waves in nonlinear irregular wave trains atop coastal shoals. At least qualitatively, this effect has been partially attributed to the "rapid" nature of the shoaling process, i.e., shoaling occurs over a distance far shorter than that required for waves to modulate themselves and adapt to the reduced water depth. Through the development of a theoretical model and highly accurate nonlinear simulations, we disentangle the respective effects of the slope length and the slope gradient of a shoal and focus on the slope length to investigate the rapidness of the shoaling process on the evolution of key statistical and spectral sea-state parameters. Provided the shoal slope is 1/10 or steeper, our results indicate that the non-equilibrium dynamics is involved even for rather short shoaling lengths and becomes dominant in the regime of large lengths. When the non-equilibrium dynamics governs the wave evolution, further extending the slope length no longer influences the statistical and spectral measures. Thus, the shoaling effect on rogue waves is mainly driven by the slope magnitude rather than the slope length. Moreover, the simulations show that a higher cut-off frequency of the wave spectrum has a smaller impact on wave statistics than expected for a flat bottom in deep water and that insufficient attenuation of low-frequency waves at the downstream domain boundary has notable influence on wave statistics atop the shoal. © 2023, CC BY-NC-SA.

关键词： Ocean currents

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Innovative machine learning for drilling fluid density prediction: a novel central force search-adaptive XGBoost in HPHT environments

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Frontiers in Energy research 2024年 12卷

作者： Shanmugasundar, G. Manjunatha, r. Cep, robert Logesh, K. Kaushik, Vikas raju, S. Srinadh Elangovan, Muniyandy Department of Mechanical Engineering Sri Sai Ram Institute of Technology Chennai India Karnataka Bangalore India Department of Machining Assembly and Engineering Metrology Faculty of Mechanical Engineering VSB-Technical University of Ostrava Ostrava Czech Republic Department of Mechanical Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Avadi India Department of Mechanical Engineering Chandigarh Engineering College Chandigarh Group of Colleges-Jhanjeri Punjab Mohali India Department of Computer Science and Engineering Raghu Engineering College Visakhapatnam India Department of Biosciences Saveetha School of Engineering Saveetha Institute of Medical and Technical Sciences Chennai India Applied Science Research Center Applied Science Private University Amman Jordan

Oil and gas industries are facing a special dilemma when it comes to high-pressure, high-temperature (HPHT) drilling as the accurate forecasting of the drilling fluid density (dFd) is a vital factor for safe and efficient operations. Complicated relationships and inconsistencies in HPHT situations are rarely mapped by current forecasting models, while their buggy performance and safety risks during drilling can be underestimated. In this research, we propose a novel machine learning (ML) approach to enhance the accuracy of dFd anticipation under HPHT conditions: central force search-adaptive extreme gradient boosting (CFS-XGB). This paper uses a dataset that has drilling variables together with the dFd for HPHT situations to examine the accuracy of the CFS-XGB model. Excluding the abnormalities of data or mistakes, the reliability of the original data is maintained by applying min–max normalization. After that, finding the important features with the help of the boosted principal component analysis (BPCA) approach to the normalized data will ensure a major improvement in the CFS-XGB methodology’s prediction efficacy. This research is experimented in the Python platform, and the performance of the proposed CFS-XGB method is analyzed in terms of MSE, r2, and AAPrE metrics. The suggested approach performs better than the current methods in forecasting the drilling fluid concentration in HPHT settings, according to the experimental data. This development in predictive modeling helps increase the productivity and safety of drilling operations, which will eventually help the oil and gas sector manage the challenges posed by HPHT drilling settings. Copyright © 2024 Shanmugasundar, Manjunatha, Cep, Logesh, Kaushik, raju and Elangovan.

关键词： Gas industry

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Green synthesis of multifunctional Cu/MnO@Biochar 3d structure as a high-performance anode material in Li-ion batteries and oxidative removal of Cango-red dye

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Case Studies in Chemical and Environmental Engineering 2024年 9卷

作者： Khasim, Syed dastager, Syed G. Alahmdi, Mohammed Issa Hamdalla, Taymour A. Ulla, Mohammad Fahad Panneerselvam, Chellasamy Makandar, Mohammad Basha Department of Physics Faculty of Science University of Tabuk Tabuk 71491 Saudi Arabia NCIM-Resource Center Biochemical Science Division CSIR-National Chemical Laboratory Dr Homi Bhabha Road Pune 411008 India Department of Chemistry Faculty of Science University of Tabuk Tabuk 71491 Saudi Arabia Department of Physics Faculty of Science Alexandria University Egypt Department of Medical Laboratory Technology Faculty of Applied Medical Science University of Tabuk Saudi Arabia Department of Biology Faculty of Science University of Tabuk Tabuk 71491 Saudi Arabia R&D Biotechnology Sami-Sabinsa Group Bangalore 560058 India

The thermochemical conversion of biomass into biochar (BC) provides a valuable platform towards green and sustainable synthesis of functional carbon nanomaterials for advanced technological applications. Herein, we report biosynthesis of Oryza sativa (rice husk) biochar nanocomposites incorporated with bimetallic Cu and MnO (Cu/MnO) nanoparticles as multifunctional materials (Cu/MnO@BC) towards high-performance anode in Li-ion batteries (LIBs) and oxidative removal of organic dyes from aqueous solutions. The 3d network of Cu/MnO@BC nanocomposite as an anode in LIBs shows excellent initial specific discharge capacity of 1126 mhA g⁻¹ at a current density of 0.1 Ag⁻¹ with negligible fade in specific capacity during charge-discharge cycles due to high surface area and mesoporous structure of the nanocomposite. Further the Cu/MnO@BC nanocomposite anode displays superior reversible rate capacity that exceeds 1060 mhA g⁻¹. The charge-discharge specific capacity and the coulombic efficiency shows excellent retention (almost 100 %) after 200 cycles of operation. The electrochemical impedance spectroscopy (EIS) at different cycles shows negligible decrease in Li⁺ diffusion coefficient thereby safeguarding the structural integrity of 3d Cu/MnO@BC after charge-discharge cycles. The textile industries widely utilize Congo-red (Cr) dye in their manufacturing processes which is a renowned pollutant that adversely affects the aquatic ecosystem. This mesoporous Cu/MnO@BC biochar nanocomposite provides a novel platform towards oxidative removal of Cr dye from aqueous solution. The catalytic activity of Cu/MnO@BC was explored for the efficient removal of Congo red, a prominent dye widely used in textile industries, known for its persistence and environmental impact. Coupling of the Cu/MnO@BC and H₂O₂ enhances the Cr removal possibly owing to the hydroxyl radical (^●OH) formation. 70 % of Cr is removed by Cu/Mn

关键词： Biochar Biochar composites Biosynthesis Cr dye Cu/MnO@BC LIBs

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New Assembly Method for Cellulose derived Graphene Quantum dots-Sensitized Solar Cells

Research Square

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research Square 2021年

作者： Mahalingam, Savisha Lau, Kam Sheng Omar, Azimah Manap, Abreeza Chelvanathan, Puvaneswaran Chia, Chin Hua Amin, Nowshad Mathews, Illona Juliana Afandi, Nurfanizan Abd rahim, Nasrudin Institute of Sustainable Energy Universiti Tenaga Nasional Jalan IKRAM-UNITENSelangor Kajang43000 Malaysia Materials Science Program Department of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Level 4 Wisma R&D University of Malaya Jalan Pantai Baharu Kuala Lumpur59990 Malaysia Department of Mechanical Engineering College of Engineering Universiti Tenaga Nasional Jalan IKRAM-UNITEN Selangor Kajang43000 Malaysia Solar Energy Research Institute Universiti Kebangsaan Malaysia Jalan IKRAM-UNITEN Selangor Bangi43600 Malaysia Sunway University No. 5 Jalan Universiti Selangor Bandar Sunway47500 Malaysia Renewable Energy Research Group King Abdulaziz University Jeddah21589 Saudi Arabia

Unambiguously layer by layer (LBL) assembly of graphene quantum dots (GQds) and dye (GQds/dye) on TiO2 photoanode is the traditional and straightforward approach in the fabrication of graphene quantum dot-sensitized solar cells (QdSSCs). Unfortunately, limited light absorption and low affinity of GQds to TiO2 surface shadow the advantages of LBL and constrains its practical application. Herein, a new strategy of mixture configuration (GQds+dye) was investigated. A distinctive nanoporous honeycomb hexagonal carbon network of GQds was found with fewer defects single crystalline structure, and an average size of 9.87 nm was produced from cellulose. Experimental results demonstrated that LBL exhibited the highest efficiency of 16.76 % under low illumination but a lower efficiency (1.43%) than the mixture method (2.91%) under standard light. The increased Jsc (5.075 mA/cm2) and high charge collection efficiency (0.96) in the mixture sample indicated enhanced electron collection at TiO2. The less -OH groups on TiO2 provides a good surface intact of GQds and N719. In addition to that, the high surface potential (33.47 mV) of the premixed sample restricted the photogenerated electrons to go into a deep state, reducing back electron transfer. Therefore, mixture assembly of co-sensitization is an effective approach for light-harvesting in QdSSC. © 2021, CC BY.

关键词： dye-sensitized solar cells

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Electrochemical immunosensing by carbon ink/carbon dot/ZnO-labeled-Ag@polypyrrole composite biomarker for CA-125 ovarian cancer detection

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Bioelectrochemistry 2023年 152卷 108430页

作者： Krathumkhet, Nattinee Imae, Toyoko Wang, Fu-ming Yuan, Chiou-Chung Manidae Lumban Gaol, Jusni Paradee, Nophawan Sustainable Polymer & Innovative Composite Materials Research Group Department of Chemistry Faculty of Science King Mongkut's University of Technology Thonburi 126 Pracha Uthit Road Bangmod Thungkru Bangkok10140 Thailand Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei10607 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei10607 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei10607 Taiwan Sustainable Energy Center National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei10607 Taiwan Department of Chemical Engineering Chung Yuan Christian University 200 Zhongbei Rd Zhongli District Taoyuan32023 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University 200 Zhongbei Rd Zhongli District Taoyuan32023 Taiwan Department of Obstetrics and Gynecology Cheng Hsin General Hospital 45 Zhenxing St Beitou Taipei11220 Taiwan

In this work, we demonstrated a novel cancer antigen 125 (CA125) biomarker detection based on electrochemical immunosensor. The biomarker on conductive composite materials of carbon ink/carbon dot/zine oxide (C-ink/Cd/ZnO) was employed as an electrode platform by using ITO substrate to enhance the interaction of antibodies (Ab) with supporting catalytic performance of ZnO as a labeling signal molecule. They were a scientist attention for biosensor with chemical stability, strong biocompatibility, high conductive signal, and accuracy. Moreover, the nanocomposite of silver@polypyrrole (Ag@PPy) was used as a potential redox mediator. The labeled construction with Ag@PPy was more accuracy than that of a free-labeled. The created immunosensor was a wide linear range as 1 ag·mL−1 − 100 ng·mL−1 and a low limitation of detection as 0.1 fg·mL−1 under the optimal condition. This suggested that the immunosensor is considered to be an accurate and efficient diagnostic tool for CA125 and other biomarkers detection in actual sample analysis for clinic. © 2023 Elsevier B.V.

关键词： Antigens

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XCloud-VIP: Virtual Peak Enables Highly Accelerated NMr Spectroscopy and Faithful Quantitative Measures

arXiv

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arXiv 2021年

作者： Guo, di Tu, Zhangren Guo, Yi Zhou, Yirong Wang, Jian Wang, Zi Qiu, Tianyu Xiao, Min Chen, Yinran Feng, Liubin Huang, Yuqing Lin, donghai Hong, Qing Goldbourt, Amir Lin, Meijin Qu, Xiaobo The School of Computer and Information Engineering Fujian Engineering Research Center for Medical Data Mining and Application Xiamen University of Technology Xiamen361024 China Department of Electronic Science Biomedical Intelligent Cloud R&D Center Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Xiamen University Xiamen361102 China School of Opto-Electronic and Communication Engineering Xiamen University of Technology Xiamen361024 China Department of Computer Science School of Information Xiamen University Xiamen361102 China College of Chemistry and Chemical Engineering Key Laboratory for Chemical Biology of Fujian Province High-field NMR Center Xiamen University Xiamen361005 China China Mobile Group Xiamen361005 China School of Chemistry Tel Aviv University Tel Aviv6997801 Israel Department of Applied Marine Physics and Engineering College of Ocean and Earth Sciences Xiamen University Xiamen361102 China

—Nuclear Magnetic resonance (NMr) spectroscopy is an important bio-engineering tool to determine the metabolic concentrations, molecule structures and so on. The data acquisition time, however, is very long in multi-dimensional NMr. To accelerate data acquisition, non-uniformly sampling is an effective way but may encounter severe spectral distortions and unfaithful quantitative measures when the acceleration factor is high. By modelling the acquired signal as the superimposed exponentials, we proposed a virtual peak (VIP) approach to self-adapt the prior spectral information, such as the resonance frequency and peak lineshape, and then feed these information into the reconstruction. The proposed method is further implemented with cloud computing to facilitate online, open, and easy access. results on simulated and experimental data demonstrate that, compared with the low-rank Hankel matrix method, the new approach reconstructs high-fidelity NMr spectra from highly undersampled data and achieves more accurate quantification. The maximum quantitative errors of distances between nuclear pairs and concentrations of metabolites in mixtures have been reduced by 61.1% and 57.7%, respectively. Copyright © 2021, The Authors. All rights reserved.

关键词： Nuclear magnetic resonance spectroscopy

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Cover Feature: Synthesis, Structures, and Thermal Properties of Symmetric and Janus “Lantern Cage” Siloxanes (Chem. Eur. J. 7/2019)

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Chemistry – A European Journal 2019年第7期25卷 1603-1603页

作者： Taishi Uchida dr. Yasunobu Egawa Takuto Adachi Naoki Oguri Masato Kobayashi Prof. dr. Takako Kudo Prof. dr. Nobuhiro Takeda Prof. dr. Masafumi Unno dr. ryoji Tanaka Department of Chemistry and Chemical Biology Graduate School of Science and Technology Gunma University Kiryu 376-8515 Gunma Japan Present Address: Frontier Research Group Research and Development (R&D) Center for Marine Bioscience Japan Agency for Marine-Earth Science and Technology (JAMSTEC) 2-15 Natsushima-cho Yokosuka 237-0061 Kanagawa Japan Inorganic Materials Chemistry Group Sagami Chemical Research Institute Ayase 252-1193 Kanagawa Japan Department of Pure and Applied Science Graduate School of Science and Technology Gunma University Kiryu 376-8515 Gunma Japan

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HUMAN-FACTOrS CONSIdErATIONS applied TO OPErATIONS OF THE FFG-8 ANd LAMPS MK III

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NAVAL ENGINEErS JOUrNAL 1984年第3期96卷 191-199页

作者： BAITIS, AE APPLEBEE, Tr MCNAMArA, TM A. Erich Baitis: a native of Germany came to the David W. Taylor Naval Ship R&D Center in 1957 as a cooperative student/trainee and received his B.S. degree in physics from Virginia Polytechnic Institute. As a 32-year-old naval architect in 1971 he received both the Vietnam Honor Service Medal and the Navy's Meritorious Civilian Service Award for his eight months as liaison with the Vietnamese Navy's ferro-cement program. As head of the Seakeeping and Stabilization Group of the Surface Ship Dynamics Branch his work has led to the development of a new standard Ship Motion Computer Program and the application of ship motions to ship habitability operability and survivability problems. A major area of this work has been the ship-aircraft interface which is particularly sensitive to ship motions wind and other environmental factors. He is a member of the American Society of Naval Engineers and was awarded the Solberg Award for 1982 “in recognition of significant engineering research and development contributions in the area of improved helicopter operations from a ship in a seaway.” Terrence A. Applebee:is currently a naval architect at the David W. Taylor Naval Ship R&D Center in the Surface Ship Dynamics Branch. he came to the Center after earning a B.S. degree in ocean engineering from Florida Institute of Technology in 1973. Since that time he has worked in the areas of seakeeping performance evaluation ship-helicopter interfacing and human factor considerations. He is a member of the American Society of Naval Engineers and the Society of Naval Architects and Marine Engineers. Thomas M. McNamara:is an employee of the John Hopkins University Applied Physics Laboratory in the ocean data acquisition program. From 1979 to 1983 he worked at David W. Taylor Naval Ship R&D Center in the Surface Ship Dynamics Branch. His expertise has focused on the development of computer models for human factor evaluations as well as motion stabilization systems. He has participated in the development of advanced stabilizat

The FFG 7/LAMPS MK III Operator Guidance Manual (OGM) was developed for all FFG-7 class frigates which are not fin stabilized or are operating with the fins off. The OGM was developed to assis the ship operators of the FFG-7 class in choosing ship speed and heading combinations which will minimize ship motion-related problems during various phases of the LAMPS deployment. Crew safety and performance were major concerns in the development of the OGM. This paper reviews the effect of human factors on ship operations during helicopter recovery, maintenance, and transit to and from the hangar.

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AIr-CUSHION LANdING CrAFT NAVIGATION

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NAVAL ENGINEErS JOUrNAL 1985年第4期97卷 248-260页

作者： GrAHAM, Hr KIM, JC BANd, EGU FOWLEr, AW Herbert R. Graham:received his degrees of B.S. in 1951 and M.S. in 1958 in aeronautical engineering from the Massachusetts Institute of Technology and the California Institute of Technology respectively. He also attended the Harvard Graduate School of Business Administration. He is presently a task manager at TRW Inc. McLean Virginia responsible for landing craft air cushion (LCAC) engineering support. Since joining TRW in 1967 he has had several technical project management and system engineering responsibilities in amphibious ships transportation and energy. He was responsible for the preliminary engineering design and cost estimates for tracked air cushion vehicles (TACVs). He has been active in several professional societies including ASNE and served as vice-chairman Los Angeles Section American Institute of Aeronautics and Astronautics. John C. Kim:received his degrees of B.S. in electrical engineering Tri-State University 1959 M.S. in electrical engineering Michigan State University 1960 and Ph.D. in electrical engineering Michigan State University. He is presently a senior staff engineer with TRW Inc. McLean Virginia where his technical experience has included communications system engineering and navigation system analysis. Since joining TRW in 1969 he has held numerous positions including section head project manager and department manager. His previous employment includes E-Systems/Melpar Division and Honeywell. Dr. Kim has been active in the IEEE Washington Chapter activities which included secretary vice-chairman and chairman of Systems Science and Cybernetics Group. Edward G.U. Band:received a B.S. degree in mechnical engineering in 1946 and a D.I.C in aeronautical engineering in 1947 at the City and Guilds College of London University. In 1951 he received an M.S. degree from Stevens Institute of Technology in fluid dynamics. After a career in the aircraft industry in England Canada and the U.S.A. he spent several years teaching in Chile and at Webb Institute of Naval Archi

Air cushion vehicles (ACVs) have operated successfully on commercial routes for about twenty years. The routes are normally quite short; the craft are equipped with radar and radio navigation aids and maintain continuous contact with their terminals. Navigation of these craft, therefore, does not present any unusual difficulty. The introduction of air cushion vehicles into military service, however, can present a very different picture, especially when external navigation aids are not available and the craft must navigate by dead reckoning. This paper considers the problems involved when navigating a high-speed air cushion vehicle by dead reckoning in conditions of poor visibility. A method is presented to assess the ACV's navigational capability under these circumstances. A figure of merit is used to determine the sensitivity of factors which affect navigation such as the range of visibility, point-to-point distance, speed, turning radius and accuracy of onboard equipment. The method provides simplistic but adequate answers and can be used effectively to compare the-capability and cost of alternative navigation concepts.

关键词： AIr CUSHION VEHICLES

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Laboratory investigation on warm mix asphalt incorporating organo-silane additive

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IOP Conference Series: Earth and Environmental Science 2020年第1期463卷

作者： S r Omranian M O Hamzah G S Mounik K P reddy Y M Kapadia S Y Teh Faculty of Applied Engineering EMIB-Research Group University of Antwerp 171 Groenenborgerlaan Antwerp 2020 Belgium School of Civil Engineering Universiti Sains Malaysia 14300 Nibong Tebal Penang Malaysia Department of Civil Engineering School of Mechanical and Construction Veltech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology. 42 Avadi-Vel Tech Road Avadi Chennai – 600 062 India Edgenta Propel Berhad Bangsar South 59200 Kuala Lumpur Wilayah Persekutuan Kuala Lumpur Malaysia

Warm mix asphalt (WMA) was developed to reduce asphalt production temperatures and energy consumption. Production of toxic gas emissions can be reduced considerably. However, lowered production temperature results in the presence of trapped moisture in the aggregates that could lead to stripping and subsequently moisture susceptibility problems, and which can be mitigated by using additives. Asphalt mixtures incorporating such additive must exhibit at least similar performance to conventional hot mix asphalts (HMA) which produce at higher temperatures. This paper evaluates the engineering properties and moisture susceptibility of asphalt mixtures incorporating Organo-Silane additive for use as WMA and anti-stripping agent. WMA samples were compacted at 125 °C and 115 °C and their performance were compared with control HMA specimens. The asphalt mixtures were prepared using similar aggregate gradation and binder types. Mixture workability was quantified in terms of the Compaction Energy Index (CEI) that was measured by integrating the area under the densification curve between gyration 8 and 92% theoretical maximum density. Lower CEI implies a more workable mixture. The CEI of WMA was 76.4, which was much less than the corresponding value for HMA. Samples were also tested for Marshal stability, resilient modulus and wheel tracking (WTT) tests according to ASTM d6927, ASTM d4123 and BS EN12697-22 procedures, respectively. The control samples perform better in the stability test. The resilient modulus of WMA was only about 10% lower compared to HMA. resistance to permanent deformation was measured from the dynamic stability (dS) or the number of wheel passes per 1 mm rut depth over the last 15 minutes in a 60-minute tracking test. The dS of HMA, WMA compacted at 125 °C and 115 °C were 3138, 3044 and 2837, respectively. From the rutting resistance standpoint, the results are not significantly different. Hence, incorporation of the additive does not adversely affect mixt

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