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SSrN 2022年

作者： Chang, Yung Fu, Ying Hong, Huei-Jhen Venault, Antoine R&D Center for Membrane Technology Department of Chemical Engineering Chung Yuan Christian University Chung-Li 32023 Taiwan

Membrane separation procedures are critical to the field of chemical engineering. Each bioseparation process aims to separate, purify or recover the desired biological product. This research focuses on a new thermo-responsive membrane bioseparation for the human leukocyte enrichment procedure. While leukocytes should be separated from whole blood for safe transfusion, these cells have long been known as efficient biomarkers for medical diagnostic. However, their low relative amount in the blood stream, compared to platelets and erythrocytes, requires a concentration step. In this study, we developed polypropylene membranes with dual functional properties able to selectively catch leukocytes and release them. In these bio-separators, the selective catching property is endowed by a copolymer composed of N-hydroxyethyl acrylamide (HEAA) and butyl methacrylate, referred to as poly(HEAA- co -BMA). The release property is ensured by thermosensitive brushes N-isopropylacrylamide (NIPAAm) contained in poly(NIPAAm- co -BMA) copolymer. After synthesizing and characterizing copolymers with various molar composition, efforts were oriented towards the optimization of each individual property. It was found that H70B30 and N70B30 copolymers (with 70 mol% HEAA or NIPAAm and 30 mol% BMA), provided the best catching and release property, respectively. Then, membranes were coated with both copolymers, characterized and used to selectively catch and release leukocytes. With white blood cell concentrate as the feed, the platelet/leukocyte ratio could be decreased by a 2-fold factor. Using whole blood, the platelet/leukocyte ratio and erythrocyte/leukocyte ratio were divided by 4 and 45, respectively. In other words, leukocytes can be efficiently concentrated using these novel bio-separators, leading to a highly concentrated solution which could benefit their use as biomarkers in diagnosis. © 2022, The Authors. All rights reserved.

关键词： Platelets

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A comprehensive case study on lost circulation of Changqing Mizhi Block in perspective of geomechanics 56

A comprehensive case study on lost circulation of Changqing ...

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56th U.S. rock Mechanics/Geomechanics Symposium

作者： Li, Xingbao Ban, Fansheng Zhu, Yujie Luo, Jiangwei Chen, Shaoyun Jin, Sheng Che, Zhenhua dong, Jingnan The Second Gas Production Plant of Petro China Changqing Oilfield Company Yulin China CNPC Engineering Technology R&D Company Limited Beijing China China University of Petroleum Beijing China Drilling Engineering Technology Research Institute Daqing Drilling and Exploration Engineering Company Daqing China Petroleum Engineering Research Institute of Dagang Oilfield Tianjin China Sinopec Zhongyuan Oilfield Engineering Service Management Center Henan China

ISBN: (纸本)9780979497575

drilling mud loss is of crucial importance in drilling. Lost circulation will extend the well construction period, cause investment losses, and even cause serious downhole accidents. In the Mizhi block of Changqing Oilfield targeted by this research, serious leakage occurred in many wellbore drilling processes, which has seriously affected the development of the block and caused economic losses. This paper focuses the mud loss during the drilling process of more than 200 wells in the Mizhi block, and counts the key loss data such as the lost horizons, the amount of lost drilling fluid, the average leak rate, and the density of the drilling fluid, and fully analyzes the possible reasons of the lost circulation. Collecting logging data, modeling geomechanics of some key wells and formations and taking cores. Finally, the geomechanical model is established. Analyzing the logging data and the specific leakage situation, the leakage mainly comes from fracture, and the leakage horizons mainly locate at the bottom of the Liujiagou Formation, the entire interval of the Shiqianfeng Formation and the top of the Shihezi Formation. Most of the mud loss sections are sand-mudstone interbeds. Geomechanical analysis shows that the rock mechanical strength of the entire interval is difficult to support the stability of the wellbore under the drilling fluid density of 1.1 grams per cubic meter, but the block loss pressure is generally between 1.1-1.2 grams per cubic meter. Collapse and leakage coexist in the wellbore. This study gives the method of drilling fluid optimization, and gives the possible reasons for the leakage from the perspective of geomechanics, which has important guiding significance for the further development of the Mizhi block. © 2022 ArMA, American rock Mechanics Association.

关键词： drilling fluids

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remaining Useful Life Prediction of Lithium-Ion Batteries on Electric Vehicles Based on LSTM-Attention 9

Remaining Useful Life Prediction of Lithium-Ion Batteries on...

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9th International Conference on Mechanical and Electronics engineering, ICMEE 2023

作者： Ma, Jiawei Gong, Xianwu Lei, Zhengchao ding, Lu Xu, Zixuan Ma, Yucheng School Of Electronics And Control Engineering Chang'an University Xi'an China Automobile Group Co. Ltd Technology Center Of Shaanxi Xi'an China Avic Shaanxi Aero Electric Co. Ltd The 47th Institute Xi'an China Gotion High-tech Co. Ltd Ai Digital Intelligence R&d Department Hefei China

ISBN: (纸本)9798350307146

Current studies on state of health (SOH) estimation and remaining useful life (rUL) prediction of lithium-ion batteries are mostly based on laboratory data, making it difficult to apply to real-world vehicle operating environments with strong real-time characteristic and complex operating conditions. This paper used internal resistance as a health indicator and proposed an internal resistance calculation method that combines battery models and actual vehicle operation data to estimate the SOH value of deep charging segments. Then, using the feature data and SOH values, the SOH estimation results of the full time period were obtained by LightGBM model. Finally, a long short-term memory network (LSTM) combined with attention mechanism was proposed to predict the rUL of battery. The experimental results show that the root-mean-square error of the LSTM-Attention model is reduced by 41.6% compared with that of the LSTM model, which effectively improves the accuracy of the rUL prediction of the battery, and is of great significance for the monitoring and maintenance of power batteries. © 2023 IEEE.

关键词： Lithium-ion batteries

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deep level transient spectroscopy:Tracing interface and bulk trap‐induced degradation in AlGaN/GaN‐heterostructure based devices

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Information & Functional Materials 2024年第3期1卷 282-303页

作者： Kexin deng Sen Huang Xinhua Wang Yixu Yao Yang Yang Li Yu Yaoyao Pei Jiayi An Qimeng Jiang Xinyu Liu Song Yang Kevin J.Chen High‐Frequency High‐Voltage Device and Integrated Circuits R&D Center Institute of Microelectronics of Chinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina Department of Electronic and Computer Engineering Hong Kong University of Science and TechnologyKowloonHong KongChina

The exceptional physical properties of gallium nitride(GaN)position GaNbased power devices as leading candidates for next‐generation high‐efficiency smart power conversion ***,GaN's multi‐component nature results in a high density of epitaxial defects,whereas the introduction of dielectric layers further contributes to severe interface states and dielectric *** factors collectively impair reliability,manifesting as threshold voltage instability and current collapse,which pose significant barriers to the advancement of GaN‐based *** the intrinsic relationship between device reliability and defects is crucial for understanding and addressing reliability degradation *** level transient spectroscopy(dLTS)offers valuable insights by revealing defect‐induced changes in electrical parameters during the capture and emission processes under varying biases,thereby elucidating the influence of defects from GaN buffer layers,AlGaN barriers,dielectric layer,and even at dielectric/(Al)GaN *** research aims to provide a foundational understanding of reliability degradation whereas further enabling enhancements in device performance from the perspectives of epitaxial growth and process preparation,ultimately striving to improve the reliability of GaN‐based devices and unlock their full potential for practical applications.

关键词： deep level transient spectroscopy defects device reliability gallium nitride devices

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Incorporation of graphene oxide in the layer-by-layer self-assembly of polyacrylic acid and poly(diallyldimethylammonium chloride) to fabricate nanocomposite membrane for forward osmosis

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Materials Chemistry and Physics 2024年 315卷

作者： Huang, Shu-Hsien Lin, Guan-Lin Gallardo, Marwin r. Chu, Yu-Ting Wang, Chen-Hsiu Millare, Jeremiah C. Lee, Kueir-rarn Department of Chemical and Materials Engineering National Ilan University Yilan26047 Taiwan R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian University Taoyuan32023 Taiwan School of Chemical Biological and Materials Engineering and Sciences Mapúa University Manila1002 Philippines Research Center for Circular Economy Chung Yuan Christian University Taoyuan32023 Taiwan

In this study, polyacrylic acid (PAA) and poly (diallyldimethylammonium chloride) (PddA) were self-assembly on the surface of hydrolyzed polyacrylonitrile membrane. Graphene oxide (GO) was embedded on the membrane through dispersing it on either PAA or PddA solution. The presence of GO in the composite membrane made the surface morphology become rougher than that of the pristine membrane. In addition, the membrane maintained hydrophilic with improved surface electronegativity. during the performance evaluation (1 M Na2SO4 as draw solution, and pure water as feed), the membrane prepared with GO in PAA solution had the highest separation efficiency. Because GO facilitates the strong electrostatic interaction between PAA + GO with PddA, resulting in a dense selective layer. At optimum concentration of GO in PAA with a bilayer, the composite membrane exhibited a water permeation flux of 16 LMH and a salt reverse diffusion of 22.3 gMH. Using different types of salts (Na2SO4, NaCl, MgSO4, MgCl as draw solution), the composite membrane confirmed that it was a nanofiltration-forward osmosis like type of membrane, giving a high separation efficiency for a draw solution of Na2SO4. © 2024 Elsevier B.V.

关键词： Efficiency

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Preparation and Characterization of Agnws Conductive Hydrogel with High Mechanical Performance, High Electrical Conductivity, and Biocompatibility

SSRN

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SSrN 2024年

作者： Wang, Fengxu Guan, Shui Wen, Chuzhou Liu, Hailong Sun, Changkai State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian116024 China Dalian R&D Center for Stem Cell and Tissue Engineering Dalian University of Technology Dalian116024 China School of Biomedical Engineering Faculty of Medicine Dalian University of Technology Dalian116024 China School of Control Science and Engineering Dalian University of Technology Dalian116024 China

Conductive hydrogels incorporating conductive fillers have garnered significant interest due to their potential applications in biomedical, tissue engineering, and other fields. However, developing hydrogels that exhibited ideal mechanical and conductive properties remained a challenge. This study reported the successful fabrication of a biocompatible hydrogel composed of polyacrylamide (PAAm), alginate (Alg), and silver nanowires (AgNWs), demonstrating high tensile strength up to 500%, excellent mechanical strength at 43.6 kPa, and high electrical conductivity (0.618 S/m) comparable to neural tissue, along with good stability and durability under cyclic loading. Furthermore, the AgNWs conductive hydrogel exhibited high swelling ratio (1700%), good adhesiveness (adhesive strength of 10.69 kPa), and biocompatibility. The inclusion of AgNWs as conductive fillers also enhanced the material’s roughness, facilitating cell adhesion and proliferation. The AgNWs conductive hydrogel developed in this study showed great potential for applications in neural electrical detection and nerve injury treatment, such as encapsulating neural electrodes with the hydrogel. © 2024, The Authors. All rights reserved.

关键词： Biocompatibility

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Customer segmentation-based basket analysis with association rule mining combined with SVd and K-Means algorithms

Customer segmentation-based basket analysis with association...

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Innovations in Intelligent Systems and Applications Conference

作者： Kaan Çullu Sadi Güzel Metin Zontul Seda Karateke Caretta R&D Center Istanbul Turkey. Department of Computer Engineering Sivas Science and Technology University Sivas Turkey. Department of Computer Engineering Faculty of Engineering Istanbul Aydin University Florya Istanbul Turkey.

In retail companies, there are many customers and products available. The basket analysis on retail datasets is important for retail companies to recommend new products to their customers in order to increase their sales and profits. In the literature, there are many studies applying basket analysis by Apriori or Frequent Pattern (FP)-Growth algorithms with other methods. There are two common problems in classical basket analysis: huge sparse data, profile-based segmentation. To eliminate huge sparse data, dimension reduction is required while clustering is necessary for customer segmentation. In our recent study, we bring forward a new basket analysis model for association rule mining by using Singular Value decomposition (SVd) for dimension reduction and K-means clustering for customer segmentation before FP-Growth algorithm. We obtained more reliable purchase rules in our model than classical FP-Growth.

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Water Jet Guided Laser Grooving of Sicf/Sic Ceramic Matrix Composites

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SSrN 2023年

作者： Hu, Tianrui Yuan, Songmei Wei, Jiayong Zhou, Ning Zhang, Zikang Zhang, Jiaqi Li, Xiaoqi R&D Center of High-efficient & Green CNC Machining Technology and Equipment School of Mechanical Engineering and Automation Beihang University Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315832 China

Water jet guided laser micro-machining is a novel processing technique that utilizes the synergistic effect of high-pressure water jets and lasers. To qualitatively and quantitatively investigate and evaluate the sensitivity of ablation depth, material removal rate, taper angle, surface morphology, and elemental composition, multiple characterization techniques, including scanning electron microscopy (SEM), energy dispersive spectroscopy (EdS), and industrial computed tomography (CT), was undertaken. The experimental results show that the sensitivity of the ablation depth, volume material removal rate, and surface morphology to process parameters was high, while the taper angle is more sensitive to the laser power. Furthermore, under certain conditions, a maximum aspect ratio was achieved, reaching up to 7.5. In practical machining, suitable laser processing parameters are selected based on different expected objectives (processing efficiency and quality). This experimental study can provide valuable guidance for the high-quality water-guided laser micro-machining of ceramic matrix composites (CMCs). © 2023, The Authors. All rights reserved.

关键词： Aspect ratio

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rEALIZABILITY ANd SYSTEM ArCHITECTUrE FOr COLLABOrATIVE LArGE-SCALE MOBILE PLATFOrM 3-d PrINTING rOBOTS

REALIZABILITY AND SYSTEM ARCHITECTURE FOR COLLABORATIVE LARG...

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ASME 2024 International design engineering Technical Conferences and Computers and Information in engineering Conference, IdETC-CIE 2024

作者： Hu, Henry Norris, William r. Soylemezoglu, Ahmet Nottage, dustin Patterson, Albert E. Department of Engineering Technology and Industrial Distribution Texas A&M University College StationTX77843 United States Department of Industrial and Enterprise Systems Engineering University of Illinois at Urbana-Champaign UrbanaIL61801 United States University of Illinois at Urbana-Champaign ChampaignIL61822 United States Construction Engineering Research Lab US Army Corps of Engineers R&D Center ChampaignIL61822 United States J. Mike Walker’66 Department of Mechanical Engineering Texas A&M University College StationTX77843 United States

ISBN: (纸本)9780791888391

Large-scale autonomous construction systems (ACSs) have become an important area of technology development in research years. Several areas remain to be comprehensively studied, including the design of both the construction equipment and final products, the science behind the materials used, system architecture, major applications (such space exploration, local disaster recovery, and expeditionary operations), and the realizability of the system. The realizability (manufacturability, assembly, and integration) of the system components is the most important of these at this point in the technology development, as it drives the feasibility and decision-making of the technology and enables the major applications. This article explores the realizability and system architecture of an ACS based on a large-scale collaborative autonomous robot (assumed to be a robotic arm) mounted in a mobile platform (such as a Warthog). The basic system configuration, the interfaces, and the realizability requirements driven by a formal concept-of-operations (CONOPS) diagram and known/designed system architecture. This work will be helpful in the further development, refinement, and application of this and similar systems by showing the major system architecture and formalizing the requirements for developing the system. Copyright © 2024 by The United States Government.

关键词： Space research

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Wind speed monitoring system using LIdAr system

Wind speed monitoring system using LIDAR system

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International Conference on Electrical Energy Systems (ICEES)

作者： G. Srinivasa Sudharsan Vijay Anand Kandaswamy J. Vishnupriyan S. Bhoommikha Department of Electronics and Communication Engineering Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology Chennai India Department of Electronics and Instrumentation Engineering R.M.K. Engineering College Chennai India Center for Energy Research Chennai Institute of Technology Chennai India

Understanding the complexities of wind behavior is crucial to increase the accuracy of short-term forecasting models. A wind system that uses Light detection and ranging (LIdAr) is used to detect wind speed. It employs lasers to ping off objects and returns to the laser’s source, measuring distance by timing the light pulse’s passage, or flight. The existing models are only applicable to software-based which will monitor only at a particular distance. The proposed system is modeled to measure wind speed for a long distance. A Time of Flight (TOF) sensor works in a similar way to a LIdAr system. It will also measure and monitor the surrounding temperature and humidity by using the dTH11 sensor and voltage will be measured by using a 7805 voltage regulator. The outputs will be displayed on a Personal Computer (PC) as a database and data analysis. With the use of this system, wind turbines will reduce windmills, and turbine damage can be stopped during wind gusts.

关键词： Temperature measurement Temperature sensors Temperature distribution Voltage measurement Laser radar Wind speed Humidity

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