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Thickness regression for backfill grouting of shield tunnels based on GPR data and CatBoost&BO-TPE:A full-scale model test study

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Underground Space 2024年第4期17卷 100-119页

作者： Kang Li Xiongyao Xie Biao Zhou Changfu huang Wei lin Yihan Zhou Cheng Wang Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground of Ministry of Education Tongji UniversityShanghai 200092China China Railway 15th Bureau Group Co.Ltd. Shanghai 200070China State Grid Shanghai Municipal Electric Power Company Shanghai 200122China

Ground penetrating radar(GPR)is a vital non-destructive testing(NDT)technology that can be employed for detecting the backfill grouting of shield *** achieve intelligent analysis of GPR data and overcome the subjectivity of traditional data processing methods,the CatBoost&BO-TPE model was constructed for regressing the grouting thickness based on GPR waveforms.A full-scale model test and corresponding numerical simulations were carried out to collect GPR data at 400 and 900 MHz,with known backfill grouting *** model test helps address the limitation of not knowing the grout body condition in actual field *** data were then used to create machine learning *** method of feature selection was proposed based on the analysis of feature importance and the electromagnetic(EM)propagation law in *** research shows that:(1)the CatBoost&BO-TPE model exhibited outstanding performance in both experimental and numerical data,achieving R^(2)values of 0.9760,0.8971,0.8808,and 0.5437 for numerical data and test data at 400 and 900 *** outperformed extreme gradient boosting(XGBoost)and random forest(RF)in terms of performance in the backfill grouting thickness regression;(2)compared with the full-waveform GPR data,the feature selection method proposed in this paper can promote the performance of the *** selected features within the 5–30 ns of the A-scan can yield the best performance for the model;(3)compared to GPR data at 900 MHz,GPR data at 400 MHz exhibited better performance in the CatBoost&BO-TPE *** indicates that the results of the machine learning model can provide feedback for the selection of GPR parameters;(4)the application results of the trained CatBoost&BO-TPE model in engineering are in line with the patterns observed through traditional processing methods,yet they demonstrate a more quantitative and objective nature compared to the traditional method.

关键词： Shield tunnel Backfill grouting GPR Model test gprMax Machine learning CatBoost&BO-TPE Thickness regression

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Atomscopic of ripple origins for two-dimensional monolayer transition metal dichalcogenides

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Nano Research 2024年第3期17卷 2136-2144页

作者： Haitao Yu Mingzi Sun Xiao Wu Cheuk Hei Chan Bolong huang Zhong lin Wang CAS Center for Excellence in Nanoscience Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityKowloon 999077Hong KongChina School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332USA

During the development of ultrathin two-dimensional(2D)materials,the appearance of ripples has been widely ***,the formation mechanisms and their influences are still rarely investigated,especially their contributions to the electronic structures and optical *** compensate for the knowledge gap,we have carried out comprehensive theoretical studies on the monolayer WSe_(2) with a series of ripple structures from 0 to 12Åin different lattice *** sensitivity of the formation energy,band structures,electronic structures,and optical properties to the ripple structures have been performed systematically for the first *** formation of ripples in Armchair and zigzag simultaneously are more energetically favorable,leading to more flexible optimizations of the optoelectronic *** improved charge-locking effect and extension of absorption ranges indicate the significant role of ripple *** spontaneous formation of ripples is associated with orbital rearrangements and structural *** leads to the unique charge carrier correlate inversion between W-5d and Se-4p orbitals,resulting in the pinning of the Fermi *** work has supplied significant references to understand ultrathin 2D structures and benefit their future developments and applications in high-performance optoelectronic devices.

关键词： two-dimensional(2D)materials ripples strain effect charge carrier correlation inversion optoelectronic properties

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Enhanced bioethanol production from sugarcane bagasse:combination of liquid hot water and deep eutectic solvent pretreatment for optimized enzymatic saccharification

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Frontiers of Chemical Science and Engineering 2024年第8期18卷 1-13页

作者： Xiaoling Xian Biying Li Shiyong Feng Jiale huang Xinyuan Fu Ting Wu Xiaoqing lin School of Chemical Engineering and Light Industry Guangdong Provincial Key Laboratory of Plant Resources BiorefineryGuangdong University of TechnologyGuangzhou 510006China

In the present study,a sustainable pretreatment methodology combining liquid hot water and deep eutectic solvent is proposed for the efficient fractionation of hemicellulose,cellulose,and lignin from sugarcane bagasse,thereby facilitating the comprehensive utilization of both C5 and C6 *** application of this combined pretreatment strategy to sugarcane bagasse led to notable enhancements in enzymatic saccharification and subsequent *** results demonstrate that liquid hot water-deep eutectic solvent pretreatment yielded 85.05±0.66 g·L^(-1)of total fermentable sugar(glucose:60.96±0.21 g·L^(-1),xylose:24.09±0.87 g·L^(-1))through enzymatic saccharification of sugarcane ***,fermentation of the pretreated sugarcane bagasse hydrolysate yielded 34.33±3.15 g·L^(-1)of *** findings confirm the effectiveness of liquid hot water-deep eutectic solvent pretreatment in separating lignocellulosic components,thus presenting a sustainable and promising pretreatment method for maximizing the valuable utilization of biomass resources.

关键词： sugar cane bagasse synergistic pretreatment enzymatic saccharification ethanol

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Achieving robust synthetic tolerance in industrial *** through negative auto-regulation of a DsrA-Hfq module

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Synthetic and Systems Biotechnology 2024年第3期9卷 462-469页

作者： Xiaofeng Yang Jingduan Yang Haozheng huang Xiaofang Yan Xiaofan Li Zhanglin lin School of Biology and Biological Engineering South China University of TechnologyGuangzhou510006China School of Biomedicine Guangdong University of TechnologyGuangzhou 510006China

In industrial fermentation processes,microorganisms often encounter acid stress,which significantly impact their *** study focused on the acid-resistant module composed of small RNA(sRNA)DsrA and the sRNA chaperone *** previous study had shown that this module improved the cell growth of Escherichia coli MG1655 at low pH,but failed to obtain this desired phenotype in industrial ***,we performed a quantitative analysis of DsrA-Hfq module to determine the optimal expression *** then assessed the po-tential of the CymR-based negative auto-regulation(NAR)circuit for industrial application,under different media,strains and pH *** assay at pH 4.5 revealed that NAR-05D04H circuit was the best acid-resistant circuit to improve the cell growth of *** *** circuit was robust and worked well in the industrial lysine-producing strain *** SCEcL3 at a starting pH of 6.8 and without pH control,resulting in a 250%increase in lysine titer and comparable biomass in shaking flask fermentation compared to the parent *** study showed the practical application of NAR circuit in regulating DsrA-Hfq module,effectively and robustly improving the acid tolerance of industrial strains,which provides a new approach for breeding in-dustrial strains with tolerance phenotype.

关键词： Acid-resistant Synthetic tolerance DsrA-Hfq Negative auto-regulation Robustness

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Atomic tailoring-induced deficiency in tungsten oxides for high-performance energy-related devices

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Tungsten 2024年第2期6卷 269-277页

作者： Jing-huang lin Yao-Tian Yan Jun-Lei Qi Chen-Yang Zha Institute of Applied Physics and Materials Engineering Zhuhai UM Science and Technology Research InstituteUniversity of MacaoTaipaMacao SAR 999078China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China Jiangmen Laboratory of Carbon Science and Technology Hong Kong University of Science and Technology(Guangzhou)Jiangmen 529199China Key Laboratory of Flexible Electronics School of Flexible Electronics(Future Technologies)Institute of Advanced MaterialsNanjing Tech UniversityNanjing 211816China

Nowadays,tungsten oxides,as a typical transition metal oxide,are widely and intensively investigated owing to their excellent material properties and device *** oxygen defi ciency in tungsten oxides is typically the key to enhance their performances for a variety of critical technological *** a gradual increase of oxygen defi ciency,various non-stoichiometric tungsten oxides can be formed by re-adjustment of the atomic arrangement,which exhibits superior performances than their traditional stoichiometric *** review mainly focuses on the recent advances in oxygen-defi cient tungsten oxides from the point of atomic structures,including the forming mechanism of non-stoichiometric tungsten oxides and the superiority of these oxygen-defi cient tungsten oxides in energy-related ***,the challenge and perspective of oxygen-defi cient tungsten oxides are also discussed.

关键词： Oxygen defi ciency Tungsten oxide Atomic structures Catalyst Storage

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Flexible MXene/sodium alginate composite fabric with high structural stability and oxidation resistance for electromagnetic interference shielding

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Nano Research 2024年第6期17卷 5326-5335页

作者： Hao-Wen Zhang Lu-Yao Yang Meng-lin huang Ming-Hua Cheng Zhe-Sheng Feng Fanbin Meng Zifeng lin Yan Wang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054China Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Wearable electromagnetic interference(EMI)shielding fabrics with excellent electromagnetic shielding performance,oxidation resistance,and structural stability are highly demanded for the rapid development of electronic devices and wireless *** are metallic conductive materials with exceptional EMI shielding properties,but they are prone to oxidation in air and have poor structural stability and durability on fabric ***,we present a one-step assembly method to fabricate fabrics coated with MXenes and polymeric sodium alginate(SA)composite(MXene-SA).SA protects MXenes from oxidation and forms a stable interlayer structure by bonding to *** MXene-SA coated fabrics are breathable and flexible,and have a low sheet resistance of 2.12±0.08Ω/sq and a high EMI shielding performance of 37.05 dB at X-band,which is comparable to the best 42.31 ***,the MXene-SA coated fabrics exhibit high structural stability and oxidation resistance under various conditions of sonication disintegration,mechanical abuse,chemical corrosion,and humidity,compared to pure MXenes coated *** believe that the wearable and high-performance MXene-SA fabrics have great potential for the next generation of ultra-portable and wearable EMI shielding products.

关键词： MXenes electromagnetic interference shielding fabric one-step assembly

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Component modeling and updating method of integrated energy systems based on knowledge distillation

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Energy and AI 2024年第2期16卷 184-199页

作者： Xueru lin Wei Zhong Xiaojie lin Yi Zhou Long Jiang Liuliu Du-Ikonen Long huang Shanghai Institute for Advanced Study Zhejiang UniversityShanghaiChina College of Energy Engineering Zhejiang UniversityHangzhouChina Jiaxing Research Institute Zhejiang UniversityJiaxingChina Department of Sustainability Science LUT UniversityLappeenrantaFinland School of Intelligent Manufacturing Ecosystem Xi'an Jiaotong-Liverpool UniversitySuzhouChina

Amid the backdrop of carbon neutrality, traditional energy production is transitioning towards integrated energy systems (IES), where model-based scheduling is key in scenarios with multiple uncertainties on both supply and demand sides. The development of artificial intelligence algorithms, has resolved issues related to model accuracy. However, under conditions of high proportion renewable energy integration, component load adjustments require increased flexibility, so the mathematical model of the component must adapt to constantly changing operating conditions. Therefore, the identification of operating condition changes and rapid model updating are pressing issues. This study proposes a modeling and updating method for IES components based on knowledge distillation. The core of this modeling method is the light weighting of the model, which is achieved through a knowledge distillation method, using a teacher-student mode to compress complex neural network models. The triggering of model updates is achieved through principal component analysis. The study also analyzes the impact of model errors caused by delayed model updates on the overall scheduling of IES. Case studies are conducted on critical components in IES, including coal-fired boilers and turbines. The results show that the time consumption for model updating is reduced by 76.67 % using the proposed method. Under changing conditions, compared with two traditional models, the average deviation of this method is reduced by 12.61 % and 3.49 %, respectively, thereby improving the model's adaptability. The necessity of updating the component model is further analyzed, as a 1.00 % mean squared error in the component model may lead to a power deviation of 0.075 MW. This method provides real-time, adaptable support for IES data modeling and updates.

关键词： Component modeling Adaptive update Knowledge distillation Variable operating conditions Integrated energy system Data-driven

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Synthetic Studies toward Pseudolaric Acids:Radical Cyclization to Form Bridged Scaffold

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Chinese Journal of Chemistry 2024年第15期42卷 1699-1705页

作者： Yujie Niu Minggui lin Hao Cui Yanji huang Yang Shen Yandong Zhang State Key Laboratoryof Physical Chemistry of Solid Surfaces Key Laboratory of Chemical Biology of Fujian ProvinceicHEMCollege of Chemistryand Chemical EngineeringXiamen UniversityXiamenFujian 361005China

Pseudolaric acids are a family of diterpenoid natural products that exhibit a broad spectrum of biological *** main structural feature of their framework is a trans-fused perhydroazulene bearing a bridged lactone positioned at the junction of the ***,we have developed a radical cyclization strategy that allows flexible tuning of the cyclization process through diverse silicon substitutions on the *** strategy can assist in constructing a series of skeletons with structural resemblance to pseudolaric acids and expedites the construction of the bridged ***,it facilitates the synthesis of the entire skeletal structure of the pseudolaric acidfamily of natural products,excludingthe B-ringfunctionalization.

关键词： Terpenoids Total synthesis Radical cyclization Bridged cycles Regioselectivity

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Epiphytic zooplankton community profiles in a typical urban wetland as revealed by DNA metabarcoding

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Journal of Oceanology and Limnology 2024年第5期42卷 1571-1585页

作者： Diwen LIANG Chunrong huang Senjie lin Jiahua DONG Mingyi LIANG Hailin LUO State Environmental Protection Key Laboratory of Urban Ecological Simulation and Protection South China Institute of Environmental SciencesMinistry of Ecology and Environment of the People’s Republic of ChinaGuangzhou 510530China Department of Marine Sciences University of ConnecticutGrotonConnecticut 06340USA

Zooplankton,a crucial component of urban wetland,are one of the effective bioindicators for monitoring the feeding stocks of organisms at higher trophic levels and assessing the ecological quality of ***,information about the characteristics of epiphytic zooplankton community structure resulted from traditional methods is limited and hindered by the large amount of detritus and sludge attached to the *** investigated the epiphytic zooplankton communities associated with macrophytes(Vallisneria,Nymphaea,and Thalia dealbata)in a subtropical wetland using as DNA markers of the 18 S rRNA gene and the mitochondrial cytochrome c oxidase subunit I(COI)gene.A total of 241 OTUs of zooplankton were obtained from COI amplicons,including 194 OTUs of Rotifera,22 of Cladocera,and 25 of Copepoda,while only 62 OTUs of zooplankton were obtained from 18 S rDNA amplicons including 34 OTUs of Rotifera and 28 of *** zooplankton communities associated with the three macrophytes were similar,but they differed significantly from those in the open ***,there were no significant temporal differences among the zooplankton *** zooplankton communities were dominated by littoral zooplankton such as Testudinella,Lecane,and ***,especially littoral species,utilize macrophytes as food sources and as refuges against *** further led to an increase inαandβdiversity of zooplankton communities in urban *** result suggests that the joint use of multiple molecular markers could improve the taxonomic resolution and generate a comprehensive biodiversity profile of zooplankton.

关键词： environmental DNA metabarcoding diversity macrophyte cytochrome c oxidase subunit I(COI) 18 S rRNA

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Microstructure and room temperature fracture toughness of Nb-Si-based alloys with Sr addition

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Rare Metals 2024年第8期43卷 3904-3912页

作者： Yong-lin huang Li-Na Jia Bin Kong Yue-ling Guo Na Wang School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Nb-Si-based alloys show great potential to surpass the widely used Ni-based *** element Sr is widely applied in aluminum and magnesium alloys,but reports about the effects of Sr on Nb-Si-based alloys are quite ***,Nb-Si-based alloys with nominal compositions of Nb-15Si-24Ti-4Cr-2Al-2Hf-0/0.05/0.15Sr(at%)were prepared by directional solidification and heat *** microstructural characterization and room temperature fracture toughness of Nb-Si-based alloy were systematically *** show that all these alloys consist of Nb_5Si_3 phase embedded within Nb solid solution(Nb_(ss)) *** Nb_(5)Si_(3) phase becomes refined and more discontinuous after adding minor *** for the fracture toughness,0.05 at% and 0.15 at% Sr additions do not cause significant *** discontinuous and refining mechanism of Sr element was studied,and the analysis of toughness decreasing with Sr addition reveals that the size of Nb_(ss) phase plays a crucial role in determining the fracture toughness.

关键词： Nb-Si alloy Refinement Discontinuous Fracture toughness Nb_(ss)

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