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Advanced strategies for marine antifouling based on nanomaterial-enhanced functional PDMS coatings

Nano Materials Science 2024年第4期6卷 375-395页

作者： Xiaohui Shi Hao Wei Wenjun Zhou Paul E.D.Soto Rodriguez Cunguo Lin Lei Wang Zhijia Zhang Engineering Harbin Engineering UniversityHarbinChina Qingdao Innovation and Development Center of Harbin Engineering University QingdaoChina State Key Laboratory for Marin Corrosion and Protection Luoyang Ship Material Research Institute(LSMRI)QingdaoChina School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbinChina Instituto de Estudios Avanzados IUDEA Departamento de FísicaUniversidad de La Laguna C/Astrofísico Francisco SanchezS/n.E-38203TenerifeSpain

Marine biofouling seriously affects human marine exploitation and transportation activities,to which marine antifouling(AF)coatings are considered to be the most cost-effective *** the mid-20th century,human beings have dedicated their efforts on developing AF coatings with long cycle and high performance,leading to a large number of non-target organisms?distortion,death and marine environmental ***(PDMS),is considered as one of the representative environment-friendly AF materials thanks to its non-toxic,hydrophobic,low surface energy and AF ***,PDMS AF coatings are prone to mechanical damage,weak adhesion strength to substrate,and poor static AF effect,which seriously restrict their use in the *** rapid development of various nanomaterials provides an opportunity to enhance and improve the mechanical properties and antifouling properties of PDMS coating by embedding *** on our research background and the problems faced in our laboratory,this article presents an overview of the current progress in the fields of PDMS composite coatings enhanced by different nanomaterials,with the discussion focused on the advantages and main bottlenecks currently encountered in this ***,we propose an outlook,hoping to provide fundamental guidance for the development of marine AF field.

关键词： Nanomaterials Antifouling PDMS composites Environment-friendly Marine biofouling

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3D reconstruction based on monocular image sequences 22

3D reconstruction based on monocular image sequences

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Proceedings of the 2022 6th International Conference on Electronic Information technology and Computer Engineering

作者： Shuo Dai Changxin Nai Peiyun Wang School of Information and Electronic Engineering Shandong Technology and Business University China Research and Development Department Huaxin Tuoyuan (Tianjin) Technology Co. China

ISBN: (纸本)9781450397148

Aiming at the complex operation of active 3D reconstruction technology, which is easily affected by external environment and equipment, this paper adopts a series of monocular image sequences taken by cell phone cameras from different angles to realize 3D scene reconstruction. Firstly, Structure-From-Motion (SFM) algorithm is used for sparse point cloud reconstruction, and the similarities and differences between incremental and global SFM algorithms for sparse reconstruction are compared; secondly, Multi-View-Stereo (MVS) is used for dense point cloud reconstruction, and finally, the surface and texture information of the object is recovered. The surface and texture information of the objects are recovered to achieve the reconstruction of 3D scenes. The experimental results show that the method can achieve better 3D reconstruction of monocular image sequences.

关键词： SFM MVS monocular reconstruction three-dimensional reconstruction

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Long-term follow-up results of testicular torsion in children

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Asian Journal of Andrology 2022年第6期24卷 653-659页

作者： Cheng-Jun Yu Jie Zhao Jin Luo Yi-Fan Hong Tian-Xin Zhao Sheng Wen Li Jiang Tao Lin Da-Wei He Guang-Hui Wei Sheng-De Wu Department of Urology Children's Hospital of Chongqing Medical UniversityChongqing 400014China Chongqing Key Laboratory of Children Urogenital Development and Tissue Engineering Chongqing 400014China National Clinical Research Center for Child Health and Disorders Chongqing 400014China China International Science and Technology Cooperation Base of Child Development and Critical Disorders Chongqing 400014China Chongqing Key Laboratory of Pediatrics Chongqing Chongqing 400014China Ministry of Education Key Laboratory of Child Development and Disorders Chongqing 400014China Department of Pediatric Urology Guangzhou Women and Children's Medical CenterGuangzhou Medical UniversityGuangzhou 510620China Department of Urology The First Affiliated Hospital of Chongqing Medical UniversityChongqing 400042China

December 2020 to investigate the long-term follow-up results after testicular torsion(TT)in *** with TT were divided into the salvage orchiopexy group and the orchiectomy group,and the baseline characteristics,ultrasonographic indications,intraoperative findings,testicular volumes,and adverse events during follow-up were compared.A total of 145 cases were included in this *** 56.6%of patients who underwent salvage orchiopexy had testicular atrophy(TA),and the median testicular volume loss of the testes was 57.4%.Age less than 6 years,delayed surgery,and intraoperative poor blood supply were associated with TA in pediatric TT after *** atrophied testes appeared within 3-6 months after *** with the corresponding age-matched healthy controls,the contralateral testicular volumes were larger in the orchiopexy(P=0.o01 without TA,and P=0.042 with TA)and orchiectomy groups(P=0.033).The adverse events were comparable in patients with orchiectomy or *** summary,follow-up before 3 months after surgery may not offer sufficient clinical value,while that 3 months after surgery should be regarded as the first follow-up time for testicular *** contralateral testes of patients with TT showed compensatory *** suggest performing orchiectomy when torsed testes are surgically assessed as Arda gradeⅢor inviable.

关键词： long-term orchiectomy pediatrics salvage orchiopexy testicular torsion

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An Efficient Wrist Photoplethysmogram Quality Assessment Method Based on Wristwatches

An Efficient Wrist Photoplethysmogram Quality Assessment Met...

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IEEE SENSORS

作者： Yumin Li Li Ling Chao Chen Zhijun Xiao Chenxi Yang Junjie Pan Chaohong Liu Huan Li Yanan Zhou Chenghao Sui Jianqing Li Chengyu Liu School of Instrument Science and Engineering Southeast University Nanjing China The Department of Digital Health Research and Development Center Goertek Technology Co. Qingdao China

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

Photoplethysmogram (PPG) is widely used to provide information about the cardiovascular system. However, PPG is very susceptible to various noises, especially wrist PPG. Highly noisy PPG could not provide sufficient information to reflect cardiovascular conditions. This study proposed an efficient signal quality assessment solution for wearable wrist PPG using only 10 time-domain features. Data from 170 participants were involved to evaluate the proposed solution. Proposed features were validated with the LightGBM model. The results show that the proposed solution achieves 0.93 in F1 score, which is higher than traditional methods. For each PPG segment, computing proposed features on the C++ platform consumes only 73.17±12.26 microseconds. Finally, the proposed method is deployed to an edge computing platform and realizes real-time PPG quality assessment.

关键词： Wrist Location awareness Computational modeling Noise Real-time systems Quality assessment Sensors Noise measurement Time-domain analysis Edge computing

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Operation of China's Carbon Emissions Trading Market

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中国化工报导（英文版） 2022年第6期33卷 25-26页

作者： Wang Ke Li Siyang Sustainable Development Research Institute for Economy and Society of Beijing School of Management and Economics of Beijing Institute of Technology

National carbon emissions trading market On July 16,2021,China opened a national carbon emissions trading market,which currently applies to power generation industry's more than 2 000 firms-more specifically,referring to power companies(including enterprise-owned power plants of other industries)that,in any year from 2013 to 2019,discharged 26 000 tons of carbon dioxide equivalent and had comprehensive energy consumption of around 10 000 standard coal.

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Prediction of multiscale laminae structure and reservoir quality in fine-grained sedimentary rocks:The Permian Lucaogou Formation in Jimusar Sag,Junggar Basin

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Petroleum Science 2022年第6期19卷 2549-2571页

作者： Xiao-Jiao Pang Gui-Wen Wang Li-Chun Kuang Jin Lai Yang Gao Yi-Di Zhao Hong-Bin Li Song Wang Meng Bao Shi-Chen Liu Bing-Chang Liu State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China Technology Administration Department Petro China Company LimitedBeijing100007China Research Institute of Exploration and Development Xinjiang Oilfield CompanyPetro ChinaKaramayXinjiang834000China

Fine-grained sedimentary rocks have become a research focus as important reservoirs and source rocks for tight and shale oil and *** development determines the accumulation and production of tight and shale oil and gas in fine-grained ***,due to the resolution limit of conventional logs,it is challenging to recognize the features of centimeter-scale *** close this gap,complementary studies,including core observation,thin section,X-ray diffraction(XRD),conventional log analysis,and slabs of image logs,were conducted to unravel the centimeter-scale *** laminae recognition models were built using well *** fine-grained rocks can be divided into laminated rocks(lamina thickness of<0.01 m),layered rocks(0.01-0.1 m),and massive rocks(no layer or layer spacing of>0.1 m)according to the laminae scale from core *** to the mineral superposition assemblages from thin-section observations,the laminated rocks can be further divided into binary,ternary,and multiple *** typical mineral components,slabs,and T2spectrum distributions of various lamina types are *** core can identify the centimeter-millimeter-scale laminae,and the thin section can identify the millimeter-micrometer-scale ***,they can detect mineral types and their superposition *** logs can identify the meter-scale layers,whereas image logs and related slabs can identify the laminae variations at millimeter-centimeter ***,the slab of image logs combined with thin sections can identify laminae assemblage characteristics,including the thickness and vertical *** identification and classification of lamina structure of various scales on a single well can be predicted using conventional logs,image logs,and slabs combined with thin *** layered rocks have better reservoir quality and oil-bearing potential than the massive and laminated *** laminated rocks’binary lamina is bette

关键词： Fine-grained sedimentary rocks Mineral composition Multiscale laminae structure Reservoir quality Image logs Lucaogou formation

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Restoration of reservoir diagenesis and hydrocarbon accumulation process by calcite in-situ U-Pb dating and fluid inclusion analysis: A case study on Cretaceous Qingshuihe Formation in Gaoquan Structure, southern Junggar Basin, NW China

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Petroleum Exploration and development 2023年第6期50卷 1386-1397页

作者： GUI Lili ZHUO Qingong LU Xuesong YANG Wenxia CHEN Weiyan WU Hai FAN Junjia HE Yinjun CAO Rizhou YU Xiaoqing Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China CNPC Key Laboratory of Basin Structure and Hydrocarbon Accumulation Beijing 100083China CNOOC Experimental Center Engineering Technology BranchCNOOC Energy Development Co.Ltd.Tianjin 300452China Wuxi Institute of Petroleum Geology SINOPEC Petroleum Exploration and Production Research InstituteWuxi 214126China

The complexity of diagenesis and hydrocarbon accumulation in the deep reservoirs in southern Junggar Basin restricts hydrocarbon exploration in the lower reservoir assemblage. The lithofacies and diagenesis of reservoirs in the Cretaceous Qingshuihe Formation in the Gaoquan structure of the Sikeshu Sag, southern Junggar Basin were analyzed. On this basis, the thermal history was calibrated using calcite in-situ U-Pb dating and fluid inclusion analysis to depict the hydrocarbon accumulation process in the Gaoquan structure. The results show that the Qingshuihe reservoir experienced two phases of calcite cementation and three phases of hydrocarbon charging. The calcite cements are dated to be (122.1±6.4) Ma, (14.4±1.0) Ma - (14.2±0.3) Ma. The hydrocarbon charging events occurred at around 14.2-30.0 Ma (low-mature oil), 14.2 Ma (mature oil), and 2 Ma (high-mature gas). The latter two phases of hydrocarbon charging contributed dominantly to the formation of reservoir. Due to the S-N compressive thrust activity during the late Himalayan period since 2 Ma, the traps in the Gaoquan structure were reshaped, especially the effective traps which developed in the main reservoir-forming period were decreased significantly in scale, resulting in weak hydrocarbon shows in the middle-lower part of the structure. This indicates that the effective traps in key reservoir-forming period controlled hydrocarbon enrichment and distribution in the lower reservoir assemblage. Calcite U-Pb dating combined with fluid inclusion analysis can help effectively describe the complex diagenesis and hydrocarbon accumulation process in the central-west part of the basin.

关键词： fluid inclusion calcite in-situ U-Pb dating diagenetic sequence hydrocarbon accumulation timing Sikeshu Sag southern Junggar Basin Cretaceous Qingshuihe Formation

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HANKE-RAUS HEURISTIC RULE FOR ITERATIVELY REGULARIZED STOCHASTIC GRADIENT DESCENT

arXiv

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arXiv 2024年

作者： Bajpai, Harshit Mittal, Gaurav Giri, Ankik Kumar Department of Mathematics Indian Institute of Technology Roorkee Uttarakhand Roorkee247667 India Defence Research and Development Organization Near Metcalfe House Delhi110054 India

In this work, we present a novel variant of the stochastic gradient descent method termed as iteratively regularized stochastic gradient descent (IRSGD) method to solve nonlinear ill-posed problems in Hilbert spaces. Under standard assumptions, we demonstrate that the mean square iteration error of the method converges to zero for exact data. In the presence of noisy data, we first propose a heuristic parameter choice rule (HPCR) based on the method suggested by Hanke and Raus, and then apply the IRSGD method in combination with HPCR. Precisely, HPCR selects the regularization parameter without requiring any a-priori knowledge of the noise level. We show that the method terminates in finitely many steps in case of noisy data and has regularizing features. Further, we discuss the convergence rates of the method using well-known source and other related conditions under HPCR as well as discrepancy principle. To the best of our knowledge, this is the first work that establishes both the regularization properties and convergence rates of a stochastic gradient method using a heuristic type rule in the setting of infinite-dimensional Hilbert spaces. Finally, we provide the numerical experiments to showcase the practical efficacy of the proposed method. Copyright © 2024, The Authors. All rights reserved.

关键词： Stochastic systems

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Remanufacturing and Suitability Study of 3D-Printed Shafts for Maritime Application Based on Finite Element Analysis

Remanufacturing and Suitability Study of 3D-Printed Shafts f...

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International Conference on Humanoid, Nanotechnology, Information technology, Communication and Control, Environment and Management (HNICEM)

作者： Leif Oliver B. Coronado Earl John T. Geraldo Ronald Joaquin B. Javate Ulysses B. Ante Department of Science and Technology Metals Industry Research and Development Center (DOST-MIRDC) General Santos Avenue Bicutan Taguig Philippines

ISBN: (数字)9798350381177

ISBN: (纸本)9798350381184

The fabrication of shafts often involves multiple machining runs/processes and advanced machining skills. The recent developments in Additive Manufacturing (AM) technologies and materials offer a great alternative to conventionally manufactured parts, especially in maritime applications with limited resources. Although the laminar nature of additively manufactured, particularly material extrusion, parts limit its mechanical properties, AM's ability to quickly make customized and complex structural geometries offers more functional opportunities. Thus, its application in allowing an easy and cost-effective way to fabricate shafts (concentric and eccentric) is favorable, especially with the incorporation of Finite Element Analysis (FEA), which will provide first-hand simulation results for design optimization. In this study, the torsional stress and deformation for different types of shafts were evaluated using FEA. Also, the part was subjected to Design for Additive Manufacturing (DfAM) using material ONYX™ (proprietary micro carbon fiber-filled nylon). The result shows the maximum stress and maximum deformation to be favorable at 0.05031 MPa and 0.00687 mm. Hence, a reference improvement method for the design of the concentric and eccentric shaft is proposed based on these analyses. An actual functional test is also conducted on the final prototype to see the effect on the actual running conditions.

关键词： Shafts Three-dimensional displays Deformation Surveillance Simulation Machining Three-dimensional printing

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Signal Detection of Mobile Multi-user Molecular Communication System Using Transformer-Based Model

Signal Detection of Mobile Multi-user Molecular Communicatio...

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International Conference on Computers, Communications, and Systems (ICCCS)

作者： Zhen Cheng Zhichao Zhang Ji Jiang Jie Sun School of Computer Science and Technology Zhejiang University of Technology Hangzhou China Research and Development Department Zhejiang Fingard Technology Co. Ltd. Hangzhou China

This paper proposes a signal detector for mobile multi-user molecular communication system by using Transformer-based model. This detector can improve the accuracy of detection ability by training the Transformer-based model at different initial distances between the transmitters and receiver, and can also perform detection in the case of unknown channel parameters. Numerical results show that compared with deep neural networks model, the Transformer-based model performs better detection ability in mobile multi-user molecular communication system with lower bit error rate of signal detection.

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