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An ultrasound-assisted nitrogen protection system for sustainable indigo dyeing of cotton fabrics

textile Research Journal 2023年第13-14期93卷 3355-3367页

作者： Wang, Kangkang Meng, Yuchen Luo, Qingliang Wang, Liming Wang, Rongwu Qin, Xiaohong Key Laboratory of Textile Science & Technology Ministry of Education College of Textiles Donghua University China

The traditional process of denim dyeing is highly environmentally damaging due to high temperature used for reduction and dyeing as well as the heavy use of sodium dithionite. It can be efficient if dyeing can be carried out with an environmental reducing agent under nitrogen protection or if the liquor ratio can be reduced. However, at such a low liquor ratio, dye molecules form agglomerates, which results in inefficient dye-uptake and uneven dyeing. This study investigated the possibility of applying ultrasound in conjunction with nitrogen protection to the dyeing of cotton fabrics with indigo reduced by the reducing agent DK. Comparing the reducing agent DK with the other reducing agents, it was found that reducing agent DK had stronger reducing and better properties for indigo dyed fabrics. Furthermore, the synergistic effect of nitrogen protection and ultrasound prevented the early oxidation and agglomeration of the leuco-indigo. It was evident that there was an increased contact area between the leuco-indigo and the cotton fiber, as well as a decrease in the crystallinity of the cellulose macromolecules. And the increased amorphous region of the cellulose macromolecules facilitated indigo-leuco’s penetration into the fiber, resulting in enhanced dyeing depths and uniformity. In addition, orthogonal experiments and gray clustering analysis were utilized to optimize the dyeing process. As a result of the optimized dyeing process, the K/S and S values of dyed denim fabric reached 16.70 and 0.12, respectively, which was 42% and 72% higher than the traditional sodium dithionite dyeing process. It was found that the dyeing liquid was more susceptible to biological and chemical degradation. In addition, the total economic costs were reduced by 11.702%. It is conceivable that eco-friendly dyeing strategies presented here have superior dyeing properties which can significantly enhance the sustainability of denim dyeing processes. © The Author(s) 2023.

关键词： Reducing agents

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Research on coal-rock identification method and data augmentation algorithm of comprehensive working face based on FL-Segformer

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International Journal of Coal science & technology 2024年第4期11卷 142-157页

作者： Yun Zhang Liang Tong Xingping Lai Shenggen Cao Baoxu Yan Yanbin Yang Yongzi Liu Wei He College of Energy Engineering Xi'an University of Science&TechnologyXi'anShaanxi 710054China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&TechnologyXuzhouJiangsu 221116China

Coal-rock interface identification technology was pivotal in automatically adjusting the shearer's cutting drum during coal ***,it also served as a technical bottleneck hindering the advancement of intelligent coal *** study aimed to address the poor accuracy of current coal-rock identification technology on comprehensive working faces,coupled with the limited availability of coal-rock *** loss function of the SegFormer model was enhanced,the model's hyperparameters and learning rate were adjusted,and an automatic recognition method was proposed for coal-rock interfaces based on ***,an experimental platform was constructed to simulate the dusty environment during coal-rock cutting by the shearer,enabling the collection of coal-rock test image *** morphology-based algorithms were employed to expand the coal-rock image datasets through image rotation,color dithering,and Gaussian noise injection so as to augment the diversity and applicability of the *** a result,a coal-rock image dataset comprising 8424 samples was *** findings demonstrated that the FL-SegFormer model achieved a Mean Intersection over Union(MIoU)and mean pixel accuracy(MPA)of 97.72%and 98.83%,*** FLSegFormer model outperformed other models in terms of recognition accuracy,as evidenced by an MloU exceeding 95.70% of the original ***,the FL-SegFormer model using original coal-rock images was validated from No.15205 working face of the Yulin test mine in northern *** calculated average error was only 1.77%,and the model operated at a rate of 46.96 frames per second,meeting the practical application and deployment requirements in underground *** results provided a theoretical foundation for achieving automatic and efficient mining with coal mining machines and the intelligent development of coal mines.

关键词： Coal-rock interface recognition Segformer Datasets augmentation Comprehensive working face•Image semantic segmentation

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Preparation of CeO_(2) abrasives by reducing atmosphere-assisted molten salt method for enhancing their chemical mechanical polishing performance on SiO_(2)substrates

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Journal of Rare Earths 2023年第10期41卷 1627-1635,I0006页

作者： Ning Xu Jiahui Ma Qi Liu Yuxin Luo Yongping Pu School of Material Science and Engineering Shaanxi University of Science&TechnologyXi'an710021China Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials Xi'an710021China

Ce^(3+)as the active site on the CeO_(2)abrasive surface is the key to enhancing the material removal rate(MRR).The CeO_(2)abrasives with high chemical activity were prepared by the molten salt method under a reducing *** crystal structure and morphology of CeO_(2)abrasive s were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),ultraviolet—visible diffuse reflectance spectroscopy(UV-Vis DRS),and X-ray photoelectron spectroscopy(XPS).The CeO_(2)abrasives were obtained under different atmospheres(Air,Ar,and Ar/H_(2)).With the enhancement of the reducing atmosphere,the morphology of the abrasives transforms from spherical to octahedral,while more oxygen vacancies and Ce^(3+)are generated on the surface of CeO_(2)*** CMP experiments show that the MRRs of the CeO_(2)-Air,CeO_(2)-Ar,and CeO_(2)-Ar/H_(2)abrasives on SiO_(2)substrates are 337.60,578.74,and 691.28 nm/min,***,as confirmed by atomic force microscopy(AFM),the substrate surfaces exhibit low roughness(20.5 nm)after being polished using all of the prepared ***,the MRR of CeO_(2)-Ar/H_(2)abrasives is increased by 104.76%compared with CeO_(2)-air *** improved CMP performance is attributed to the increased Ce^(3+)concentration and the octahedral morphology of the abrasives enhancing the chemical reaction and mechanical removal at the abrasive-substrate interface.

关键词： CeO_(2) Chemical mechanical polishing(CMP) Reducing atmosphere Material removal rate(MRR) Molten salt method Rare earths

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Impacts of Winter Eurasian Snow Cover Anomalies on the Surface Air Temperature Variability over West Asia

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Journal of Meteorological Research 2024年第4期38卷 733-748页

作者： Jiarong HE Siguang ZHU Haishan CHEN Zehua QIAO Key Laboratory of Meteorological Disaster Ministry of Education(KLME)/International Joint Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&Technology(NUIST)Nanjing 210044 School of Atmospheric Sciences Nanjing University of Information Science&TechnologyNanjing 210044

Previous research has shown that land surface thermal anomalies in West Asia(WA) can impact regional and global climate,particularly affecting China through the eastward propagation of wave ***,the factors driving these anomalies in WA have not been extensively *** on the observation data,this work focuses on examining the impacts of Eurasian winter snow cover on winter surface air temperature(SAT) variability over WA from 1978/1979 to 2017/2018 and explores the underlying physical *** results indicate that a crucial snow anomaly area extending from the Baltic Sea to eastern Ural significantly influences the winter SAT anomaly in *** anomalous increase(decrease) in winter snow cover in this key area corresponds to the anomalously warmer(cooler) SAT in *** relationship is primarily driven by the albedo effects of snow cover,where more(less)snow cover induces cooling(warming) of the overlying air,altering upper-level geopotential height and influencing the intensity,duration,and frequency of local blocking ***,changes in the air temperature above the key area modify the meridional temperature gradient(MTG) between high and low latitudes,affecting the mean zonal flow in the *** of the thermodynamic energy equation for SAT reveals that the combined effects of variations in blocking events in high latitudes and mean zonal flow in midlatitudes alter the advection of climatological temperature by anomalous winds,which is caused by the anomalous increase(decrease) of snow cover in the key ***,this leads to changes in cold advection transported to WA,contributing to the occurrence of a warmer(colder) SAT over WA in winter.

关键词： West Asia Eurasian snow surface air temperature blocking episode

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Effect of Pore Morphology and Regional Distribution of Liquid Diffusion Directionality in Nonwoven Fabrics

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Journal of Donghua University(English Edition) 2023年第3期40卷 267-276页

作者：殷炯周倩倩纪峰张瑞云王妮王永生 Key Laboratory of Textile Science&Technology Ministry of EducationDonghua UniversityShanghai 201620China China Chemical Fibers Association Beijing 100020China

The effect of pore morphology and regional distribution on liquid diffusion directionality in nonwoven fabrics was investigated in this *** orientation angle(POA) and pore aspect ratio(PAR) were proposed to characterize the pore morphology,and α-region,β-region,and αβ-region were used to describe the characteristics of the pore regional *** directional characteristics of macroscopic diffusion of liquid in nonwoven fabrics were characterized by the indicator of primary diffusion orientation angle(PDOA).Ten kinds of spunlaced nonwoven fabrics were ***,the data of pore characteristic indices of each sample were obtained through scanning electron microscope(SEM) and the image processing technology as well,and the pore regional distribution map of each sample was further ***,the PDOA of each sample was obtained through the droplet method and image processing *** on the data and statistical analysis,it was found that the PDOA of a certain volume of liquid in the nonwoven fabrics presented a significant linear relationship with the average POA of the nonwoven *** the characteristics of pore distribution affected the directionality of liquid diffusion in the nonwoven *** samples with a large proportion of α-region and good distribution had prominent liquid diffusion along the direction of laying-up,and the difference in liquid diffusion of the samples was more obvious between the directions of laying-up and vertical laying-up.

关键词： liquid diffusion anisotropy pore morphology regional distribution primary diffusion orientation angle(PDOA)

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Fe-Loaded Two-Dimensional Nitrogen-Doped Carbon for Electromagnetic Wave Absorption

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Chinese Physics Letters 2024年第12期41卷 202-209页

作者： Xi Wen Yang Qin Yu Hao Geng Chang Kai Huang Ming Lei Xiaojun Shen Yong He Xuchao Pan Yufeng Wu Ministerial Key Laboratory of ZNDY Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory of Information Photonics and Optical Communications School of Integrated CircuitsBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Information Photonics and Optical Communications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

Electromagnetic wave-absorbing materials play a crucial role in modern electronics,particularly in stealth and communication ***-based materials demonstrate considerable potential for the development and use of effective wave-absorbing substances,attributed to their complex structure,lightweight nature,excellent corrosion resistance,and ***,nitrogen-doped carbon-based two-dimensional(2D)materials exhibit a more pronounced depletion effect on electromagnetic waves owing to their increased specific surface area and numerous polarization *** article presents the successful synthesis of nitrogen-doped carbon(NC)2D flakes using a hydrothermal *** addition,single Fe atoms were successfully incorporated onto their surfaces,forming Fe@*** wave-absorbing capabilities of the Fe@NC samples were considerably improved,achieving a minimum reflection loss(RLmin)of−69.22 dB at 11.48 GHz and an effective absorption bandwidth of 5.79 *** enhancement in electromagnetic wave absorption is attributed to the synergistic effects of magnetic loss,relaxation processes,dipole polarization,and electrical conduction *** successful synthesis of Fe@NC opens up new avenues for the development of atomically dispersed wave-absorbing materials.

关键词： corrosion absorbing Electromagnetic

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Self-adaptive gas flow and phase change behaviors during hydrate exploitation by alternate injection of N_(2) and CO_(2)

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Petroleum science 2024年第3期21卷 2120-2129页

作者： Bo-Jian Cao Yi-Fei Sun Hong-Nan Chen Jin-Rong Zhong Ming-Long Wang Ming Wang Chang-Yu Sun Guang-Jin Chen State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China School of Chemistry and Chemical Engineering Changsha University of Science&TechnologyChangsha410114HunanChina

Since hydrate resources play a part of the stratigraphic framework structure in sediments,establishing a safe and economic method for hydrates exploitation remains the primary challenge to this *** the proposed methods,the spontaneous displacement of CH_(4) from hydrate cages by CO_(2) seems to be a perfect mechanism to address gas production and CO_(2) storage,especially in today's strong demand for carbon reduction and replacing clean *** extensive lab researches,in the past decade,injecting a mixture of CO_(2) and small molecule gas has become a key means to enhance displacement efficiency and has great potential for ***,there is a lack of in-depth research on gas flow in the reservoir,while the injected gas always passes through low-saturated hydrate areas with high permeability and then occurs gas channel in a short term,finally resulting in the decreases in gas production efficiency and produced gas ***,we explored a new injection-production mode of alternate injection of N2 and CO_(2) in order to fully coordinate the advantages of N_(2) in enhanced hydrate decomposition and CO_(2) in solid storage and heat *** alternate"taking"and"storing"processes perfectly repair the problem of the gas channel,achieving self-regulation effect of CH_(4) recovery and CO_(2) *** 3-D experimental results show that compared to the mixed gas injection,CH_(4) recovery is increased by>50%and CO_(2) storage is increased by>70%.Additionally,this alternate injection mode presented a better performance in CH_(4) concentration of produced gas and showed outstanding N_(2) utilization ***,we analyzed its self-adaptive gas flow mechanism and proposed an application model of"one injection and multiple production".We look forward to this study accelerating the application of CO_(2)-CH_(4) replacement technology.

关键词： Hydrate Replacement CH_(4)recovery CO_(2)storage Reservoir remediation

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Recent advances in multifunctional metal-organic frameworks for lithium metal batteries

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science China Chemistry 2024年第3期67卷 759-773页

作者： Jiaqi Li Zheng Weng Zuosu Qin Ying Zhang Ning Zhang Xiaohe Liu Chuankun Jia Gen Chen Jiang Zhou School of Materials Science and Engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South University Zhongyuan Critical Metals Laboratory Zhengzhou University College of Materials Science and Engineering Changsha University of Science&Technology

In view of novel materials in the field of lithium metal batteries(LMBs), metal-organic frameworks(MOFs) have attracted extensive research interest owing to their controllable pore size, unsaturated metal sites and multifunctional organic groups. A variety of MOFs have been elaborately calculated and synthesized to be applied as separator coating, electrolyte modulators and solid-state electrolyte fillers in LMBs. In this mini-review, we summarize the mechanism of MOFs to limit the migration of anions, improve the Li-ion transference number and prolong the lifespan of LMBs. Suitable pore structure of MOFs can physically restrict the movement of Li^(+). Unsaturated metal sites can adsorb anions by electrostatic interaction. In addition,multifunctional organic functional groups that limit the migration of anions are discussed. Finally, the key challenges and perspectives in the development direction of MOFs-based separators and electrolytes are further elaborated.

关键词： metal-organic frameworks lithium metal battery separator electrolyte

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Preparation of a novel lactose-lignin hydrogel catalyst with self-reduction capacity for nitrogenous wastewater treatment

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Frontiers of Chemical science and Engineering 2024年第9期18卷 25-36页

作者： Fan Zhang Yanzhu Guo Xianhong Wu Ce Gao Qingda An Zhongjian Tian Runcang Sun Key Laboratory of Pulp and Paper Science&Technology of Ministry of Education Qilu University of TechnologyShandong Academy of SciencesJinan 250353China The Liaoning Province Key Laboratory of Paper and Pulp Engineering The Dalian Key Laboratory of High Value Application and Development of Botanical ResourcesThe Key Laboratory of High Value Utilization of Botanical Resources of China Light IndustryDalian Polytechnic UniversityDalian 116034China

A novel carboxylated lactose/sodium lignosulfonate/polyacrylic acid hydrogel composites with self-reduction capacity was successfully synthesized by self-assembly *** hydrogel with well-developed porous structure provided abundant anchoring points and reduction capacity for transforming Ag^(+)into silver *** nanoparticles dispersed among the network of hydrogel and the composites exhibited catalytic *** catalytic performance was evaluated via degradation of p-nitrophenol,rhodamine B,methyl orange and methylene blue,which were catalyzed with corresponding reaction rate constants of 0.04338,0.07499,0.04891,and 0.00628 s^(–1),*** addition,the catalyst exhibited stable performance under fixed-bed condition and the corresponding conversion rate still maintained more than 80%after 540 ***,the catalytic performance still maintained effective in tap water and simulated *** catalytic efficiency still remained 99.7%with no significant decrease after 8 cycles.

关键词： carboxylated lactose Ag NPs self-reduction nitrogenous wastewater

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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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