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New digital drilling process monitoring: Instrumentation, validation and calibration

Journal of Rock Mechanics and Geotechnical Engineering 2025年第1期17卷 31-54页

作者： Yanpeng Sun Zuyu Chen Fangcai Xu Yufei Zhao Ruilang Cao Dong Li State Key Laboratory of Eco-hydraulics in Northwest Arid Region Xi'an University of TechnologyXi'an710048China State Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins China Institute of Water Resources and Hydropower ResearchBeijing100048China Sinohydro Foundation Engineering Co. Ltd.Tianjin301700China North China Institute of Science&Technology Langfang065201China

This study aims to enhance the digital drilling process monitoring(DPM)or monitoring while drilling(MWD)technique,which is a widely recognized method in geological exploration for evaluating rock mass ***,robust displacement and torque measurement facilities for rotary-core drilling are *** conventional cable encoder for displacement measurement is replaced with a magnetostrictive displacement sensor,which is more reliable in harsh field drilling *** enables the measurement of the bit position with an accuracy of<1 *** importantly,this new instrument is proven to be successful in improving the detection of structural discontinuities with thicknesses>1 *** addition,by measuring the electric current of the driving motor,the torque applied to the bit is conveniently and accurately *** innovations ensure high-quality data collection for DPM ***,two indices derived from DPM are proposed to quantitatively describe rock mass *** specific energy index(SEI)and specific penetration index(SPI)are based on the principles of energy conservation and Mohr-Coulomb failure criterion,*** field tests conducted in a dam grouting area confirm a linear relationship between the thrust force and penetration per rotation,and between the torque and penetration per *** correlation ratios of the related regressions are typically>*** two indices allow for the quantitative interpretation of DPM data into rock mechanics characteristics,such as uniaxial compressive strength,rock quality designation(RQD),and rock mass permeability,eliminating the need for subjective judgment normally involved in the currently used rock mass quality rating approaches.

关键词： Drilling process monitoring Specific penetration index Specific energy index Fracture identification

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Yarn Quality Prediction for Small Samples Based on AdaBoost Algorithm

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Journal of Donghua University(English Edition) 2023年第3期40卷 261-266页

作者：刘智玉陈南梁汪军 College of Textiles Donghua UniversityShanghai 201620China Key Laboratory of Textile Science&Technology Ministry of EducationDonghua UniversityShanghai 201620China

In order to solve the problems of weak prediction stability and generalization ability of a neural network algorithm model in the yarn quality prediction research for small samples,a prediction model based on an AdaBoost algorithm(AdaBoost model) was established.A prediction model based on a linear regression algorithm(LR model) and a prediction model based on a multi-layer perceptron neural network algorithm(MLP model) were established for *** prediction experiments of the yarn evenness and the yarn strength were *** coefficients and prediction errors were used to evaluate the prediction accuracy of these models,and the K-fold cross validation was used to evaluate the generalization ability of these *** the prediction experiments,the determination coefficient of the yarn evenness prediction result of the AdaBoost model is 76% and 87% higher than that of the LR model and the MLP model,*** determination coefficient of the yarn strength prediction result of the AdaBoost model is slightly higher than that of the other two *** that the yarn evenness dataset has a weaker linear relationship with the cotton dataset than that of the yarn strength dataset in this paper,the AdaBoost model has the best adaptability for the nonlinear dataset among the three *** addition,the AdaBoost model shows generally better results in the cross-validation experiments and the series of prediction experiments at eight different training set sample *** is proved that the AdaBoost model not only has good prediction accuracy but also has good prediction stability and generalization ability for small samples.

关键词： stability and generalization ability for small samples.key words:yarn quality prediction AdaBoost algorithm small sample generalization ability

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Preparation of Hydrophilic and Shrink-Proofing Wool Fabrics Through Thiol-Ene Click Chemistry Reaction

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Journal of Donghua University(English Edition) 2022年第5期39卷 426-434页

作者： WANG Litao ZHOU Aihui DAI Chenlu YUAN Jiugang Key Laboratory of Science&Technology of Eco-Textile Ministry of EducationJiangnan UniversityWuxi 214122China Fujian Fiber Inspection Center Fuzhou 350000China

To improve shrink-proofing performance and hydrophilicity of wool fabrics, the wool fibers were modified by poly(ethylene glycol) dimethacrylate(PEGDMA) through thiol-ene click chemistry reaction. Firstly, wool fabrics were reduced at room temperature with a high-efficiency disulfide bond reducing agent, tris(2-carbonxyethyl) phosphine hydrochloride(TCEP). Then the thiol-ene click chemistry reaction was initiated by dimethyl 2, 2’-azobis(2-methylpropionate)(AIBME) through the heating method. Fourier transform infrared(FTIR) spectroscopy, Raman spectroscopy, and scanning electron microscopy test results all showed that PEGDMA was successfully grafted onto wool fabric surface. Physical properties, hydrophilicity, and shrink-proofing performance were assessed. The wetting time of PEGDMA grafted wool fabrics decreased to about 3 s. After being grafted with PEGDMA, the felting shrinkage of wool fabrics rapidly decreased to about 8%. The anti-pilling properties of wool fabrics were also greatly improved to 5 class after 2 000 times of friction. Meanwhile, the load retention rate of fabrics could reach 90%. It provides a method of wool modification to improve hydrophilicity and anti-felting performance.

关键词： poly(ethylene glycol)dimethacrylate(PEGDMA) click chemistry anti-felting hydrophilic modification

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Structure and mechanical properties of windmill palm fiber with different delignification treatments

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Journal of Bioresources and Bioproducts 2024年第1期9卷 102-112页

作者： Changjie Chen Pengfei Xu Xinhou Wang Key Laboratory of Textile Science&Technology(Donghua University) Ministry of EducationCollege of Textiles2999 Renmin North RoadShanghai 201620China Basalt Fiber and Composite Key Laboratory of Sichuan Province Sichuan 635000China College of Mechanical Engineering Donghua UniversityShanghai 201620China National Engineering Laboratory for Modern Silk Soochow UniversitySuzhou 215123China Shanghai Composite Technology Co.Ltd. Shanghai 201112China

The removal of lignin from natural cellulose fibers is a crucial step in preparing high-performance materials,such as compressed high-toughness *** process can eliminate non-cellulosic impurities,create abundant compressible pores,and expose a greater number of active functional *** this study,biomass waste windmill palm fiber was used as the raw mate-rial to prepare holocellulose fibers through various chemical *** structure,chemical composition,Fourier transform infrared spectroscopy analysis,X-ray diffraction analysis,ther-mal properties,and mechanical properties,particularly fatigue performance,were *** sodium chlorite treated fiber had the highest crystallinity index(61.3%)and the most complete appearance *** sodium sulfite treated fiber had the highest tensile strength(227.34±52.27)*** peroxide treatment removed most of the lignin and hemicellulose,increas-ing the cellulose content to 68.83%±0.65%.However,all the chemical treatments decreased the thermal property of the fibers.

关键词： Windmill palm fiber Delignification treatment Morphonology Mechanical property Fatigue property

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Electrochemical imaging uncovers the heterogeneity of HER activity by sulfur vacancies in molybdenum disulfide monolayer

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Chinese Chemical Letters 2025年第3期36卷 212-216页

作者： Xiaoli Deng Xiangchao Lu Yang Cao Qianjin Chen Key Laboratory of Science and Technology of Eco-Textile Ministry of EducationCollege of Chemistry and Chemical EngineeringDonghua UniversityShanghai 201620China State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Engineering of sulfur vacancies on the basal plane of molybdenum disulfide(MoS_(2))may provide effective way to promote the catalytic *** the sulfur vacancy density has previously been correlated with catalytic activity,direct evidence that vacancies create surfaces with enhanced electrocatalytic activity is still ***,we used a combination of scanning electrochemical cell microscopy(SECCM)with submicrometer resolution and photoluminescence imaging to show that sulfur vacancies in monolayer MoS_(2)microflakes lead to significant spatial heterogeneity in the electrochemical hydrogen evolution reaction(HER)***,colocated multi-microscopy unveils that regions with superior HER activity are associated with sulfur vacancy *** the vacancy density increases,the triangular flakes display significantly enhanced and spatially uniformly distributed electrocatalytic *** multi-microscopic imaging approach using SECCM convincingly highlights the spatial heterogeneity of electrocatalytic activity across monolayer MoS_(2)by sulfur vacancy engineering.

关键词： Nanoelectrochemistry Scanning electrochemical cell microscopy MoS_(2)monolayers Hydrogen evolution reaction Sulfur vacancy

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Morphological Evolution of Self-Assembled Sodium Dodecyl Sulfate/Dodecyltrimethylammonium Bromide@Epoxy-β-Cyclodextrin Supramolecular Aggregates Induced by Temperature

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Journal of Renewable Materials 2024年第4期12卷 629-641页

作者： Qingran Meng Wenwen Xu Zuobing Xiao Qinfei Ke Xingran Kou Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai201620China Collaborative Innovation Center of Fragrance Flavor and Cosmetics School of Perfume and Aroma Technology(Shanghai Research Institute of Fragrance&Flavour Industry)Shanghai Institute of TechnologyShanghaiChina

Bio-based cyclodextrins(CDs)are a common research object in supramolecular *** special cavity structure of CDs can form supramolecular self-assemblies such as vesicles and microcrystals through weak interaction with guest *** different forms of supramolecular self-assemblies can be transformed into each other under certain *** regulation of supramolecular self-assembly is not only helpful to understand the self-assembly principle,but also beneficial to its *** the present study,the self-assembly behavior of epoxy-β-cyclodextrin(EP-β-CD)and mixed anionic and cationic surfactant system(sodium dodecyl sulfate/dodecyltrimethylammonium bromide,SDS/DTAB)in aqueous solution was *** and particle size characterization found that the SDS/DTAB@EP-β-CD complex,as the basic building unit,self-assembled into worm-like micelles at lower temperatures and vesicles at higher *** magnetic resonance(NMR)and Fourier transform infrared spectroscopy(FT-IR)analysis revealed that the driving force for the formation of vesicles and worm-like micelles was the hydrogen bonds between EP-β-CD molecules,while water molecules played an important role in promoting vesicle formation between SDS/DTAB@EP-β-CD ***,the mechanism of the morphologic transformation of SDS/DTAB@EP-β-CD supramolecular aggregates induced by temperature was elucidated by exploring the self-assembly process,which may provide an excellent basis for the development of delivery carriers.

关键词： Epoxy-β-cyclodextrin SDS/DTAB self-assembly temperature morphological evolution

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Biomimetic leaf structures for ultra-thin electromagnetic wave absorption

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Nano Research 2024年第5期17卷 4507-4516页

作者： Shikun Hou Ying Wang Feng Gao Fei Jin Benfeng Zhu Qiong Wu Hongliang Ge Zhihai Cao Hua Yang Magnetism Key Laboratory of Zhejiang Province&College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China Department of Materials Science and Engineering Guangdong Technion-Israel Institute of TechnologyShantou 515063China Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing&Finishing of Textiles Ministry of EducationZhejiang Sci-Tech UniversityHangzhou 310018China

Ultra-thin electromagnetic wave(EMW)absorbers present challenging demands on EMW absorption *** inspiration from heather leaf structures,this study introduces an innovative design strategy for EMW absorbing material,proposing biomimetic leaf SnO_(2) structures(bio-SnO_(2))on carbon fabric(CF).By employing leaf-shaped SnS2 as precursors,biomimetic leaf SnO_(2) nanostructures are constructed on CF surface after a simple thermal treatment,resulting in bio-SnO_(2)@CF *** results indicate that bio-SnO_(2)@CF exhibits an exceptional minimum reflection loss of-54.8 dB at an incredibly thin thickness of 1.2 *** cross section(RCS)simulations further validate the outstanding EMW attenuation ability of bio-SnO_(2)@CF,attaining a maximum RCS reduction value of 16.9 dBm^(2) at an incident wave angle ofθ=0°.This novel research showcases the biomimetic structural design strategy and its remarkable function in enhancing the EMW absorbing performance at ultra-thin absorber thickness.

关键词： biomimetic leaf structures electromagnetic wave absorption ultra-thin thickness

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Robust,flame-retardant and colorful superamphiphobic aramid fabrics for extreme conditions

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science China(Technological sciences) 2021年第8期64卷 1765-1774页

作者： LIU Xiang CHEN JunLi SHAO QingQing CAO JiQiang DU ZhaoQun LIU HongLing YU WeiDong Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai201620China

High-performance superamphiphobic fabrics are very useful in special fields,such as firefighting,rescue,and polar *** complicated preparation process,easily damaged surface structure,and high cost drastically limit their commercial *** this work,we utilized a simple,low-cost superamphiphobic coating to prepare a superamphiphobic aramid fabric(SAF).The excellent repellency to acid/alkali solutions and low boiling point organic solvents has been demonstrated with the contact angle of>150°and>130°,***,the original color of the fabric can also be maintained,accompanied by superior flame retardancy,strength and comfort with thermal degradation of 361℃.More importantly,SAF displayed excellent durability via 50 standard machine washes,100-min of ultrasonic washing,10-min of UV irradiation,120-min of high-temperature heating,5000 cycles of abrasion,and destructive abrasion by sharp *** the results showed the superior performance of our SAF in protective fabrics under extreme environmental conditions.

关键词： superamphiphobic chemical protective aramid robust flame

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Analysis of Ethylene Glycol Degumming Process and Characterization of Hemp Fibers

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Journal of Donghua University(English Edition) 2023年第3期40卷 255-260页

作者：池虹秦智慧赵树元刘柳张瑞云程隆棣 College of Textiles Donghua UniversityShanghai 201620China Key Laboratory of Textile Science&Technology Ministry of EducationDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

To overcome the shortcomings of traditional degumming process,an efficient and environmentally friendly ethylene glycol(EG) degumming process was adopted to degum hemp *** surface morphology,chemical composition,chemical structures,and mechanical properties of the fiber samples were analyzed to explore the mechanism of the degumming *** was found that the EG degumming process could be divided into the main degumming stage(heating) and the supplementary degumming stage(insulation).The removal rates of hemicellulose and lignin in the main degumming stage were 70.56% and 60.17%,*** the supplementary degumming stage,9.95% hemicellulose and 25.39% lignin were *** is confirmed that EG can separate hemp fibers effectively with less damage,which holds great potential for the biomass fiber separation technology.

关键词： hemp fiber degumming process ethylene glycol(EG) hemicellulose lignin

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A topological polymer network with Cu(Ⅱ)-coordinated reversible imidazole-urea locked unit constructs an ultra-strong self-healing elastomer

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science China Chemistry 2023年第3期66卷 853-862页

作者： Lei Yang Zenghe Liu Rasoul Esmaeely Neisiany Jiaming Lou Yifan Guo Luzhi Zhang Huijie Liu Shuo Chen Shijia Gu Zhengwei You State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Department of Materials and Polymer Engineering Faculty of EngineeringHakim Sabzevari UniversitySabzevar ***Iran Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China

It is exceedingly desired, but difficult to construct self-healing materials with both excellent mechanical properties and healing efficiency, which are usually realized by using mutually exclusive methods. Here, we reconcile this contradiction by utilizing copper-bis-(imidazole-2-yl)-methane-urea(Cu-BIMU) locked units based on novel designed dynamic imidazole-urea bonds with coupled multiple noncovalent bonds(coordination bonds, π-π stacking bonds, and hydrogen bonds). The coordination of Cu(II) greatly reduces the electron-cloud density of imidazole, which lowers the free energy barrier of imidazole-urea bonds and promotes their reversible dissociation, as demonstrated by the density functional theory and small-molecule model reaction. The topological design of Cu-BIMU polyurethane(Cu-BIMU-PU), which concentrates multiple crosslinking-in-one locked unit to avoid the formation of excessive crosslinking sites to ensure high chain mobility, facilitates self-healing. Accumulative extensive intermolecular interactions endowed excellent mechanical properties to the resulting Cu-BIMU-PU elastomer with a tensile strength of 65.3 MPa, among the highest ever-reported value. This work provides a novel molecular design principle for fabricating high-performance dynamic polymers.

关键词： topological polymer network self-healing elastomer urea bonds

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