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4th International Symposium on Power Electronics and Control engineering, ISPECE 2021

作者： Liu, Jing Lu, Xi Ji, Yang Northwest Engineering Corporation Limited Power China Shaanxi Xian710065 China High Slope and Geological Hazard Research and Management Branch National Energy and Hydropower Engineering Technology R&D Center Xi anShaanxi710065 China

ISBN: (数字)9781510650374

ISBN: (纸本)9781510650367

Geomembrane material selection is the most critical problem of dam seepage prevention. This paper analyzes the key points of geomembrane selection from the aspects of geomembrane material, durability, thickness and composite mode, so as to provide some reference for the application of geomembrane in dam seepage prevention engineering. The key points of material selection include the followingï1/4š the quality and uniformity of the internal components of the membrane and its adaptability to the deformation of the dam body, and should be combined with calculation to determine the thickness, avoid construction damage as far as possible to choose more than 1mm film thickness, the durability of geomembrembrances should be ensured by considering the effects of solar radiation, operating state, time effect, temperature, freeze-Thaw and dry-wet changes on material properties, anti-Aging measures, etc. The dam surface geomembrane seepage control is more inclined to use a composite factory of one cloth and one membrane, core rockfill dam geomembrane can be used in the form of two cloth and one membrane. © COPYrIGHT SPIE. downloading of the abstract is permitted for personal use only.

关键词： Seepage

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Construction of transfer-free regular through-pore polyimide composite microfiltration membranes via amphiphilic dendron-assisted breath-figure method for water treatment

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Separation and Purification technology 2023年第1期327卷

作者： Hu, Chien-Chieh Fang, Jia-Ci Jeng, ru-Jong Wu, Chien-Hsin Huang, Ying-Chi Sun, Yi-Ming Lee, Kueir-rarn Lai, Juin-Yih Advanced Membrane Materials Research Center Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan Institute of Polymer Science and Engineering National Taiwan University Taipei106319 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Chungli32003 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Chungli32023 Taiwan

regular through-pore membranes exhibit extremely high productivity and size-selective capabilities. Previous studies have demonstrated that the use of a polymer alone on a solid substrate surface hinders the formation of regular through-pore membranes. In this study, amphiphilic dendrons were used as surfactants to concentrate the functional groups and strengthen the weak bonding forces between the molecules, which is conducive to the formation of regular through-pores in the membrane. The amphiphilic dendrons were mixed with commercial-grade polyimide (PI) using chloroform as the solvent, and the solution was evenly coated on the surface of the filter paper. Using the breath-figure method, an ultrathin regular through-pore PI layer was formed directly on the surface of the filter paper. The SEM image shows that regular through-pores were formed only on the surface of the substrate. The preparation process used in this study eliminates the need to transfer ultrathin and weak membranes to the substrate surface, which simplifies the membrane-making process. Pure water and yeast solution filtration tests were conducted on the composite membrane prepared with a 5 mg/ml dendron solution. A pure water permeance of 118,826 L m-2h−1 bar−1 (LMH/bar) was obtained, the yeast solution permeance and rejection are 17,410 LMH/bar and 92.85 %, respectively. The yellow, turbid, muddy water was successfully purified to clean water. The original performance of the fouled membrane was restored after only 30 s of water flushing. This study proposes a new approach to fabricate high-efficiency regular through-pore PI composite microfiltration membranes. © 2023 Elsevier B.V.

关键词： Microfiltration

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Unified Accelerator for Attention and Convolution in Inference Based on FPGA

Unified Accelerator for Attention and Convolution in Inferen...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Tianyang Li Fan Zhang Xitian Fan Jianliang Shen Wei Guo Wei Cao Information Engineering University Zhengzhou China National Digital Switching System Engineering and Technological R&D Center Zhengzhou China Shanghai HONGZHEN Information Science & Technology Corporation Shanghai China Institute for Big Data Fudan University Shanghai China

Many models combining Transformers with convolutional neural networks (CNNs) for computer vision tasks have achieved state-of-the-art results. However, due to the different computation patterns between attention and convolution, using a dedicated Transformer or CNN accelerator will inevitably reduce the computing efficiency of the other. To overcome this problem, we propose a unified architecture for attention and convolution on FPGA. We reduce runtime overhead by offloading part of self-attention computations offline before inference. Furthermore, we present a unified mapping method according to the computing characteristics of attention-based and convolution-based models. This accelerator implements multi-head attention in Transformer, independent resNet-50 and hybrid blocks of attention and con-volution in BoTNet-50 at 200MHz on Xilinx Virtex Ultrascale+ XCVU37P. Experimental results show that the solution is nearly 3.62 times more energy-efficient than the NVIdIA V100 GPU, and the computational efficiency is 11.86% and 28.29% higher than the state-of-the-art Transformer and resNet-50 accelerators, respectively.

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Preparation and development of Polymer-Based dielectric Composite: Influence of Agro-Waste Materials

Preparation and Development of Polymer-Based Dielectric Comp...

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Industrial Electronics: developments & Applications (ICIdeA), IEEE International Conference on-

作者： r Siva Madhulatha B Vinod Baburao Pasupulati S. Amosedinakaran P. rajakumar Ponnuru Sudhakiran Physics H&BS department Aditya College of Engineering and Technology (Autonomous) Andhra Pradesh India Center for Advanced Multidisciplinary Research and Innovation Chennai Institute of Technology Chennai Tamilnadu India Department of EEE Vel Tech Rangarajan Dr.Sagunthala R&D Institute of Science and Technology Avadi Chennai TamilNadu India ECE Department New Horizon College of Engineering Bengaluru India

ISBN: (数字)9798331533205

ISBN: (纸本)9798331533212

developing novel dielectric materials has always been an exciting area in material research, owing to their importance, especially in the electrical and electronic industries. Materials play an essential role in every walk of life. Extracting materials from nature, processing and understanding their characteristics, and using them proficiently are living skills. It focuses on utilizing polytetrafluoroethylene (PTFE) as a matrix with varying different weight fractions of banana leaves (BL) and sugarcane bagasse (SCB) to improve capacitive energy storage and reduction of material weight. An attempt was made to choose a 10% tantalum pentoxide (Ta2O5) filler as secondary reinforcement, which was found to have a high dielectric constant and good compatibility with the existing fabrication procedure. Therefore, this work has focused on elucidating various aspects of the dielectric behavior and has been carried out on lightweight materials with high dielectric constants and low leakage currents for memory devices. The PTFE/6%(BL-SCB)/5% Ta2O5 has a high tensile strength of 46.78 MPa and improves electrical resistivity of 3.235 volts. Hence, this type of material has potential applications in producing dielectric devices like capacitors, actuators, and environmentally friendly solutions.

关键词： Fabrication dielectric constant Costs Temperature Capacitors dielectric losses Optical fiber devices Thermal analysis Polymers Thermal stability

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research and application of drilling rig optimization model

Research and application of drilling rig optimization model

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2024 8th International Conference on Electrical, Mechanical and Computer engineering (ICEMCE)

作者： Yue Xiao Tuo Zhou Guojun Liu Xuanren Chen Xiangji Kong Yu Zhang Longlong Liu Shunong diao CNPC Engineering Technology R&D Co. LTD PetroChina International Exploration and Development Co. LTD Overseas Drilling and Completion Technology Center Beijing China PetroChina International Exploration and Development Co. LTD Beijing China Changchun University of Technology Changchun China China University of Petroleum (Beijing) Beijing China

ISBN: (数字)9798331506230

ISBN: (纸本)9798331506247

The optimal selection of drilling rigs is crucial for the rational arrangement of drilling rigs in multi operation teams, the improvement of moving operation management level, and the enhancement of drilling operation quality and efficiency. At present, the optimal selection of drilling rigs only considers whether the drilling meets the needs of the drilling project and the moving distance, and cannot comprehensively and scientifically select drilling rigs, which is not conducive to the rational configuration evaluation of oilfield drilling rig operation. This article comprehensively considers key indicators such as drilling efficiency, time efficiency, moving cycle, moving cost, and moving distance, innovatively forms a pentagonal drilling rig optimization coordinate system, establishes drilling rig optimization rate, comprehensive standard deviation, drilling rig optimization comprehensive standard deviation and other indicators, and forms a drilling rig optimization model for drilling. Taking Block B as an example, the priority of Block B with three drilling rigs to be optimized calculated using the model is ${\mathrm {r}}1\gt {\mathrm {r}}2\gt {\mathrm {r}}3$.The optimal selection rate of drilling r1 is the highest, the comprehensive standard deviation is smaller, and the comprehensive index of the best and more stable drilling performance is the highest, which is 0.0058. Therefore, r1 should be selected for drilling. The drilling rig optimization model proposed in this paper provides a process reference for drilling rig optimization, quantifies various indicators, and provides a theoretical basis for new well drilling rig optimization, project company drilling rig operation plan formulation, and improving project company drilling rig management level.

关键词： drilling Costs Uncertainty Optimization models Computational modeling Stability criteria Companies Complexity theory Standards Optimization

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Kinetic Analysis of Ni-Co Electrodeposition with Saccharin Using Electrochemical Impedance Spectroscopy

SSRN

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SSrN 2024年

作者： Choi, Jae-Ik Park, Inyeol Park, Suyeon Yi, Min Jun Jang, Wonbong Seo, Jong Hyun Department of Materials Engineering Purdue University IN United States Department of Materials Science and Engineering Korea Aerospace University Goyang Korea Republic of Department of Semiconductor Science Engineering and Technology Korea Aerospace University Goyang Korea Republic of Goyang Korea Republic of R&D Center YMT Co. Ltd. Incheon Korea Republic of

The reaction kinetics of nickel-cobalt alloy electrodeposition is investigated through Electrochemical Impedance Spectroscopy (EIS). results revealed two primary effects of saccharin additives: reducing competition between hydrogen and metal adsorption, and inhibiting reaction by blocking active sites. At low saccharin concentrations, reduced competition led to rapid hydrogen evolution, resulting in non-uniform and rough microstructures. Conversely, saccharin's strong inhibition effect at higher concentrations yielded fine microstructures with mirror-like appearance. These microstructural changes significantly enhanced the mechanical and tribological properties of the electrodeposited film. Furthermore, the suppression of hydrogen reactions stabilized the local pH during the electrodeposition, producing high-quality metallic films with reduced oxide/hydroxide impurities. This study paves the way to understand the complex interplay of electroplating additives in metallic-alloy electrodeposition to optimize microelectronics fabrication. © 2024, The Authors. All rights reserved.

关键词： X ray photoelectron spectroscopy

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development of Agglomeration Process for Polybutadiene Latex Particles by Polymer Agglomerating Agent: Influence of Key Process Parameters on Particle Size, Shrinkage rate and Kinetics

SSRN

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SSrN 2024年

作者： Zhao, Li Lu, Shulai Chen, Ming Wang, Yuchao Ning, Lei Zhao, Shicheng Shanghai Key Laboratory of Multiphase Materials Chemical Engineering School of Chemical Engineering East China University of Science and Technology Shanghai200237 China Jilin Petrochemical Company PetroChina Jilin132021 China PetroChina ABS Resin Technology R&D Center Jilin132021 China Research Institute of Jilin Petrochemical Company PetroChina Jilin132021 China

The agglomeration of polybutadiene latex (PBL) is a complex process influenced by numerous factors. Up to now, the change of particle size of agglomerated PBL with time under varying conditions remains unclear, and the agglomeration kinetic model of PBL has not been proposed. In this study, the influence of the process parameters on the particle size of agglomerated PBL with time was studied, including the amount of agglomerating agent, temperature, stirring rate and solid content of PBL. According to the particle size evolution of agglomerated PBL, the agglomeration process of PBL is divided into two stages, including the dispersion of the agglomerating agent and its adsorption and coalescence with PBL (stage I), followed by the shrinkage of agglomerated PBL particles (stage II). It was found that the process of stage I can be accelerated significantly by increasing the amount of agglomerating agent and agglomeration temperature during PBL agglomeration, thereby reducing the total agglomeration time. The mean particle size of agglomerated PBL was also reduced when the agglomeration process reached stability. With the increase of stirring rate, the time required for agglomeration of PBL and the mean particle size of agglomerated PBL decrease. The higher the solid content of pre-agglomerate PBL, the shorter the time for PBL to complete the agglomeration, but it has no obvious effect on the mean particle size of agglomerated PBL. Based on the experimental results, on the one hand, a novel method for expressing the particle size shrinkage of agglomerated PBL was developed. This analysis was based on the change of mean particle size of agglomerated PBL with time. On the other hand, the Boltzmann equation was used to ﬁt the agglomeration kinetics of the whole process of PBL agglomeration. © 2024, The Authors. All rights reserved.

关键词： Boltzmann equation

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Co-pyrolysis of corn stalk and high-density polyethylene with emphasis on the fibrous tissue difference on thermal behavior and kinetics

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Science of the Total Environment 2024年 957卷 177847页

作者： Chen, Bo Xie, deyin Jiang, Yongjie Wang, Yankun Su, Changsheng Yao, Zhitong Cai, di Cao, Hui Watson, Ian Systems Power and Energy Research Division James Watts School of Engineering College of Science and Engineering James Watt South University of Glasgow GlasgowG128QQ United Kingdom National Energy R&D Center for Biorefinery Beijing University of Chemical Technology Beijing100029 China College of Materials Science and Environmental Engineering Hangzhou Dianzi University Hangzhou310018 China College of Life Science and Technology Beijing University of Chemical Technology Beijing100029 China

The thermal properties of various corn stalk tissues (including stem, husk, ear, cob, and leaf), high-density polyethylene (HdPE), and their blends were investigated using thermogravimetric analysis under a nitrogen atmosphere. The results indicate that the thermal decomposition process of corn stalk tissue/HdPE mixtures is delayed with an increasing heating rate, regardless of the tissue type. Besides, the structural differences among various corn stalk tissues significantly influence their thermal behavior, product distribution, and co-pyrolysis kinetics with HdPE. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) was conducted to analyze the pyrolytic products of the blends with different corn stalk tissues, revealing that corn cob/HdPE blends produce a higher yield of valuable chemicals, such as the furan derivates and aromatic hydrocarbons. Kinetic analysis was further performed using Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods to determine the activation energy for the reactions occurring during co-pyrolysis. The co-pyrolysis of corn cob/HdPE blend requires the least activation energy (149.3 kJ/mol) among five blends, which was ascribed to the high hemicellulose content in corn cob. Moreover, machine learning algorithms, including random forest (rF) and gradient boost regression tree (GBrT), were applied to predict mass loss in the corn fiber/HdPE blends, which showed rF possessed superior accuracy over GBrT. These findings suggest that isolating plant tissues during the feedstock pre-management could enhance the valorization performance of lignocellulose-waste plastic co-pyrolysis. © 2024 Elsevier B.V.

关键词： Gas chromatography

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research on Optimization and Acceleration Method of Ship detection Based on deep Learning

Research on Optimization and Acceleration Method of Ship Det...

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China International SAr Symposium (CISS)

作者： Hongnan Tian Yang Gao Lei Liao Yuxuan Bie Wei Hua Hui Wang Beijing R&D Center Shanghai Key Laboratory of Aerospace Milimeter Wave Information Technology Shanghai Academy of Spaceflight Technology Beijing China Territorial spatial data center of rizhao Rizhao China Shanghai Key Laboratory of Aerospace Milimeter Wave Information Technology Shanghai Institute of Satelite Engineering Shanghai China

Synthetic Aperture radar (SAr), as an all-day and all-weather high-resolution imaging radar, has been more and more widely used in the field of ship detection. However, due to the limitations of computing resources on satellite-based platforms, it is difficult to deploy ship detection models based on deep learning on satellites. In order to solve the above problems, this paper proposes a method based on TensorrT and CUdA co-optimization. Take advantage of the parallel computing advantages of GPU through CUdA parallel computing optimization method. Improve the processing efficiency of image preprocessing. deploy the trained model through TensorrT and reconstruct the model from both vertical and horizontal aspects. And adjust the number of quantization digits of the model to improve the operating efficiency of the model. Through experiments, after adopting the above optimization strategy, the model achieved an acceleration ratio of 3.19 times in running time.

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Whether Membranes developed for Organic Solvent Nanofiltration (OSN) Tend to Be Hydrophilic or Hydrophobic? ── A review

SSRN

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SSrN 2023年

作者： Tong, Yi-Hao Luo, Li-Han Jia, rui Han, rui Xu, Sun-Jie Xu, Zhen-Liang State Key Laboratory of Chemical Engineering Membrane Science and Engineering R&D Lab Chemical Engineering Research Center School of Chemical Engineering School of Materials Science and Engineering Shanghai Electronic Chemicals Innovation Institute East China University of Science and Technology 130 Meilong Road Shanghai200237 China

In the past few decades, organic solvent nanofiltration (OSN) has attracted numerous researchers and broadly applied in various fields Many review papers reviewed the basics, problems of the membranes, up-to-date studies, and applications at various levels. In this review, we have focused on the relationship between the surface hydrophilicity of OSN membranes and OSN performances. Finally, from the industrialization perspective, the application progress of hydrophilic and hydrophobic OSN membranes was introduced. We started with history and theory, presented many research and application cases of hydrophilic and hydrophobic OSN membranes, and discussed anticipated progress in the OSN field. Also, we pointed out some future research directions on the hydrophilicity of OSN membranes to deeply develop the effect made by membrane hydrophilicity on OSN performance for future considerations and stepping forward of the OSN industry. © 2023, The Authors. All rights reserved.

关键词： Organic solvents

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