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A novel deep learning framework with variational auto-enco.er for indoor air quality prediction

Frontiers of Environmental Science & Engineering 2024年第1期18卷 97-109页

作者： Qiyue Wu Yun Geng Xinyuan Wang Dongsheng Wang ChangKyoo Yoo Hongbin Liu Jiangsu co.Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China co.lege of Automation&co.lege of Artificial Intelligence Nanjing University of Posts and TelecommunicationsNanjing 210023China Guangxi Key Laboratory of Clean Pulp&papermaking and Pollution co.trol College of Light Industry and Food EngineeringGuangxi UniversityNanning 530004China Laboratory for co.prehensive Utilization of paper Waste of shandong Province Shandong Huatai Paper Co.Ltd.Dongying 257335China Department of Environmental Science and Engineering College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

Exposure to poor indoor air co.ditions poses significant risks to human health, increasing morbidity and mortality rates. Soft measurement modeling is suitable for stable and accurate monitoring of air pollutants and improving air quality. Based on partial least squares (PLS), we propose an indoor air quality prediction model that utilizes variational auto-enco.er regression (VAER) algorithm. To reduce the negative effects of noise, latent variables in the original data are extracted by PLS in the first step. Then, the extracted variables are used as inputs to VAER, which improve the accuracy and robustness of the model. Through co.parative analysis with traditional methods, we demonstrate the superior performance of our PLS-VAER model, which exhibits improved prediction performance and stability. The root mean square error (RMSE) of PLS-VAER is reduced by 14.71%, 26.47%, and 12.50% co.pared to single VAER, PLS-SVR, and PLS-ANN, respectively. Additionally, the co.fficient of determination (R2) of PLS-VAER improves by 13.70%, 30.09%, and 11.25% co.pared to single VAER, PLS-SVR, and PLS-ANN, respectively. This research offers an innovative and environmentally-friendly approach to monitor and improve indoor air quality.

关键词： Indoor air quality PM_(2.5)co.centration Variational auto-enco.er Latent variable Soft measurement modeling

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Full waveform inversion based on hybrid gradient

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Petroleum Science 2024年第3期21卷 1660-1670页

作者： Chuang Xie Zhi-Liang Qin Jian-Hua Wang Peng Song Heng-Guang Shen Sheng-Qi Yu Ben-Jun Ma Xue-Qin Liu Qingdao Innovation and Development Base Harbin Engineering UniversityQingdao266000ShandongChina Qingdao Innovation and Development Center Harbin Engineering UniversityQingdao266000ShandongChina CNOOC Research Institute co. Ltd.Beijing100028China co.lege of Marine Geoscience Ocean University of ChinaQingdao266100ShandongChina Weihai Sunfull Geophysical Exploration Equipment co. Ltd.Weihai264209ShandongChina

The low-wavenumber co.ponents in the gradient of full waveform inversion(FWI)play a vital role in the stability of the ***,when FWI is implemented in some high frequencies and current models are not far away from the real velocity model,an excessive number of low-wavenumber co.ponents in the gradient will also reduce the co.vergence rate and inversion *** solve this problem,this paper firstly derives a formula of scattering angle weighted gradient in FWI,then proposes a hybrid *** hybrid gradient co.bines the co.ventional gradient of FWI with the scattering angle weighted gradient in each inversion frequency band based on an empirical formula derived *** weighted hybrid mode,we can retain some low-wavenumber co.ponents in the initial lowfrequency inversion to ensure the stability of the inversion,and use more high-wavenumber co.ponents in the high-frequency inversion to improve the co.vergence *** results of synthetic data experiment demonstrate that co.pared to the co.ventional FWI,the FWI based on the proposed hybrid gradient can effectively reduce the low-wavenumber co.ponents in the gradient under the premise of ensuring inversion *** also greatly enhances the co.vergence rate and inversion accuracy,especially in the deep part of the *** the field marine seismic data experiment also illustrates that the FWI based on hybrid gradient(HGFWI)has good stability and adaptability.

关键词： Full waveform inversion Hybrid gradient Scattering angle weighted Low-wavenumber co.ponent

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A Tiny Example Based Procedural Model for Real-Time Glinty Appearance Rendering

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Journal of co.puter Science & Technology 2024年第4期39卷 771-784页

作者： You-Xin Xing Hao-Wen Tan Yan-Ning Xu Lu Wang School of Software Shandong UniversityJinan 250101China NetEase(Hangzhou)Network co. LtdHangzhou 310052China

The glinty details from co.plex microstructures significantly enhance rendering ***,the previous methods use high-resolution normal maps to define each micro-geometry,which requires huge memory *** paper observes that many self-similarity materials have independent structural characteristics,which we define as tiny example *** propose a procedural model to represent microstructures implicitly by performing spatial transformations and spatial distribution on tiny ***,we preco.pute normal distribution functions(NDFs)by 4D Gaussians for tiny examples and store them in multi-scale NDF *** with a tiny example based NDF evaluation method,co.plex glinty surfaces can be rendered simply by texture *** experimental results show that our tiny example based the microstructure rendering method is GPU-friendly,successfully reproducing high-frequency reflection features of different microstructures in real time with low memory and co.putational overhead.

关键词： real-time rendering reflectance modeling glinty material photorealistic rendering microstructure

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FDSC-YOLOv8:Advancements in Automated Crack Identification for Enhanced Safety in Underground Engineering

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co.puter Modeling in Engineering & Sciences 2024年第9期140卷 3035-3049页

作者： Rui Wang Zhihui Liu Hongdi Liu Baozhong Su Chuanyi Ma Key Laboratory of co.puting Power Network and Information Security Ministry of EducationShandong Computer Science Center(National Supercomputer Center in Jinan)Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China School of Qilu Transportation Shandong UniversityJinan250100China Geotechnical and Structural Engineering Center Shandong UniversityJinan250061China shandong Lairong High-Speed Railway co. Ltd.Weihai264200China shandong High-Speed Group co. Ltd.Jinan250014China

In underground engineering,the detection of structural cracks on tunnel surfaces stands as a pivotal task in ensuring the health and reliability of tunnel ***,the dim and dusty environment inherent to under-ground engineering poses co.siderable challenges to crack *** paper proposes a crack segmentation algorithm termed as Focused Detection for Subsurface Cracks YOLOv8(FDSC-YOLOv8)specifically designed for underground engineering structural ***,to improve the extraction of multi-layer co.volutional features,the fixed co.volutional module is replaced with a deformable co.volutional ***,the model’s receptive field is enhanced by introducing a multi-branch co.volutional module,improving the extraction of shallow features for small ***,the Dynamic Snake co.volution module is inco.porated to enhance the extraction capability for slender and weak ***,the co.volutional Block Attention Module(CBAM)module is employed to achieve better target *** FDSC-YOLOv8s algorithm’s mAP50 and mAP50-95 reach 96.5%and 66.4%,acco.ding to the testing data.

关键词： Crack segmentation improved YOLOv8 engineering applications feature extraction

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Finite Element Simulation and Experimental Study on Vibration Characteristics of co.verter Transformer Under DC Bias

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Protection and co.trol of Modern Power Systems 2024年第4期9卷 110-125页

作者： Hao Wang Li Zhang Youliang Sun Liang Zou the School of Electrical Engineering Shandong Uni-versityJinan 250061China the School of Electrical Engineering Shandong UniversityJinan 250061China shandong Power Equipment co. Ltd.Jinan 250101China

To clarify the electromagnetic,vibration,and loss characteristics of the internal co.ponents of a co.verter transformer under DC bias co.ditions and their influencing mechanisms,a series of studies are co.ducted using the finite element method and model *** paper quantifies the influence of different DC co.tents on the magnetic flux density,force,and displacement distribution characteristics of the iron co.e and winding and analyzes the internal relationship between various *** inflection point of the DC bias co.fficient on the vibration is obtained and the co.tribution mechanism of the different responses of the iron co.e and winding to this inflection point is *** value of the DC bias co.fficient for changing the main vibration frequency is *** the DC bias co.fficient is 1.0 and 1.5,the main frequency of vibration moves to the right to 250 Hz and 350 *** on the principle of similarity,a DC bias vibration experimental platform for co.verter transformers is developed,and DC bias magnetic experiments are co.ducted to verify the reliability of the simulation results.

关键词： DC bias co.verter transformer finite element and experimental analysis

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Analysis and Research on Mechanical Stress and Multiobjective Optimization of Synchronous Reluctance Motor

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CES Transactions on Electrical Machines and Systems 2024年第3期8卷 274-283页

作者： Han Zhou Xiuhe Wang Lixin Xiong Xin Zhang School of Electrical Engineering Shandong UniversityJinan 250061China School of Electrical and Electronic Engineering Shandong University of TechnologyZibo 255000China shandong Kehui Power Automation co. Zibo 255000China

The mechanical strength of the synchronous reluctance motor(SynRM)has always been a great *** paper presents an analysis method for assessing stress equivalence and magnetic bridge stress interaction,along with a multiobjective optimization *** the co.plex flux barrier structure and inevitable stress co.centration at the bridge,the finite element model suitable for SynRM is ***,a neural network structure with two inputs,one output,and three layers is *** functions are co.structed to enhance ***,the equivalent stress can be co.verted into a co.tour distribution of a three-dimensional stress *** co.tour line distribution illustrates the matching scheme for magnetic bridge lengths under equivalent ***,the paper explores the analysis of magnetic bridge interaction *** optimization levels co.responding to the length of each magnetic bridge are defined,and each level is analyzed by the finite element *** Taguchi method is used to determine the specific gravity of the stress source on each magnetic *** on this,a multiobjective optimization employing the Multiobjective Particle Swarm Optimization(MOPSO)technique is *** taking the rotor magnetic bridge as the design parameter,ten optimization objectives including air-gap flux density,sinusoidal property,average torque,torque ripple,and mechanical stress are *** relationship between the optimization objectives and the design parameters can be obtained based on the response surface method(RSM)to avoid too many experimental *** optimized model is co.pared with the initial model,and the optimized effect is ***,the temperature distribution of under rated working co.ditions is analyzed,providing support for addressing thermal stress as mentioned earlier.

关键词： Multiobjective optimization Neural network Stress equivalence Synchronous reluctance motor Taguchi method

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Research on the cuttings discharge in air cushion chamber of slurry shield based on CFD-DEM co.pling method Author links open overlay panel

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Particuology 2024年第8期91卷 88-105页

作者： Han Wang Wantao Ding Weimin Yang Chengzhen Wang Wenduan Yu Zhicheng Wang School of Qilu Transportation Shandong UniversityJinan250002China China Railway 14th Bureau Group co. LtdJinan250101China

The rapid discharge of cuttings from the air cushion chamber is crucial for the co.struction safety and excavation efficiency of the slurry *** studies have mainly focused on the transport characteristics of cuttings in the slurry discharge pipe,while the co.plete process of cuttings entering the slurry discharge pipe from the air cushion chamber until they are discharged was often *** on the CFD-DEM co.pling method and co.bined with actual engineering,this paper established a numerical model that can more co.pletely reflect the cuttings discharge process during slurry shield tunneling,and the effects of the slurry velocity at slurry gate and sco.ring pipes,inclination angle of slurry discharge pipe,cuttings diameter and shape co.fficient were investigated by analyzing the variation in the mass flow rate,mass of discharged cuttings,and discharged *** results revealed that increasing the slurry velocity can promote the discharge of *** keep the discharged rate at a high level,it is reco.mended that the slurry velocity at the slurry gate should be greater than 0.15 m/*** the inclination angle of the discharge pipe is co.ducive to the rapid discharge of *** with large diameter or small shape co.fficient are more prone to accumulate in the air cushion chamber and cause clogging *** research results not only help to improve engineers'understanding of cuttings discharge in slurry shield,but also provide practical guidance for formulating relevant co.struction measures.

关键词： Slurry shield CFD-DEM co.pling method Cuttings discharge Aircushion chamber Slurry discharge pipe

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Improving antioxidant activities of water-soluble lignin-carbohydrate co.plex isolated from wheat stalk through prolonging ball-milling pretreatment and homogeneous extraction

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Journal of Bioresources and Bioproducts 2024年第1期9卷 113-125页

作者： Di Xie Zhulan Liu Yunfeng Cao Sheng-I Yang Chen Su Mi Li Jiangsu co.innovation Center for Efficient Processing and Utilization of Forest Products Nanjing Forestry UniversityNanjing 210037China International Innovation Center for Forest Chemicals and Materials Nanjing Forestry UniversityNanjing 210037China Center for Renewable Carbon School of Natural ResourcesUniversity of TennesseeKnoxvilleTN 37996USA shandong huatai paper co. Ltd.Dongying 257000China School of Natural Resources University of TennesseeKnoxvilleTN 37996USA Key Lab of Biomass Energy and Material Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryJiangsu ProvinceNanjing 210042China

Water-soluble lignin-carbohydrate co.plex(LCC)rich in polysaccharides exhibits benign in vitro antioxidant activities and distinguishes high bioco.patibility from lignin-rich LCC and ***,the antioxidant activity of water-soluble LCCs remains to be improved and its structure-antioxidant relationship is still ***,structurally diversified water-soluble LCCs were isolated under different ball-milling pretreatment durations(4,6,8 h),extraction pathways(ho-mogeneous and heterogeneous),and isolation routines(water extracts and residues after water extraction).Their structures were characterized by wet chemistry,chromatography and *** activities were evaluated by ferric reducing antioxidant power and 1,1-diphenyl-2-picrylhydrazyl radicals scavenging rate(RDPPH).Results show that altering ball-milling duration and isolation procedures cause varied structures and antioxidant activities of the water-soluble ***,prolonging ball-milling duration to 8 hours and homogeneous extrac-tion can enhance their antioxidant activity through releasing more phenolic structures and pro-moting the extraction of high-molecular-weight LCCs via reducing mass-transfer resistance,*** a result,the RDPPH of water-soluble LCCs reaches up to 97.35%,which is associated with the arabinan co.tent with statistical significance(P<0.05).This study provides new insights into the structure-antioxidation relationship of herbaceous LCC as potential antioxidants.

关键词： LCC Homogeneous extraction Ball-milling Structure-antioxidation relationship Wheat straw

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Effect of the Retarder on Initial Hydration and Mechanical Properties of the"one-step"Alkaliactivated co.posite Cementitious Materials

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1199-1213页

作者： DING Rui HE Yue LI Xingchen LI Han TIAN Hao WANG Hongen School of Materials Science and Engineering Jilin Jianzhu UniversityChangchun 130118China Ziyang Urban co.struction Investment Group co. LtdNanchong 637000China shandong Taihe Urban co.struction Development co. Ltd.Jining 272000China

This paper studied the effects of different retarders on the performance of the"one-step"alkali-activated co.posite cementitious material(ACCM)which is co.posed of ground granulated blast slag(GGBS)and fly ash(FA),and analyzed its mechanical properties,hydration mechanism,and retardation *** effects of retarders on the hydration products,mechanical properties,and hydration kinetics of ACCM were investigated using XRD,SEM,FTIR,EDS,and thermoactive *** results showed that Na_(2)B_(4)O_(7)·10H_(2)O(B)delayed the exotherm during the alkali activation process and co.ld effectively delay the setting time of ACCM,but the mechanical properties were slightly *** setting time of ACCM increased with the increase in SG co.tent,but the mechanical properties of ACCM decreased with the increase in SG co.tent.C1_(2)H_(22)O_(11)(CHO)co.ld effectively delay the hydration reaction of ACCM and weakly enhanced the co.pressive strength.H_(3)PO_(4)(HP)at a co.centration of 0.05 mol/L had a certain effect on ACCM retardation,but HP at a co.centration of 0.07 and 0.09 mol/L had an effect of promoting the setting and hardening time of ACCM.

关键词： "one-step"alkali-activated co.posite cementitious materials solid activator hydration mechanism retarder retarding mechanism

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Energy mechanism of bolt supporting effect to fissured rock under static and dynamic loads in deep co.l mines

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International Journal of Mining Science and Technology 2024年第3期34卷 371-384页

作者： Deyuan Fan Xuesheng Liu Yunliang Tan Xuebin Li Shenglong Yang co.lege of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and co.trol Shandong University of Science and TechnologyQingdao 266590China National Energy Group Ningxia co.l Industry co. Ltd.Yinchuan 753001China

The stability co.trol of fissured rock is difficult,especially under static and dynamic loads in deep co.l *** this paper,the dynamic mechanical properties,strain rate evolution and energy dissipation of fissured and anchored rocks were respectively obtained by SHPB *** was found that bolt can provide supporting efficiency-improving effect for fissured rock against dynamic disturbance,and this effect increased quadratically with decrease in anchoring ***,the energy dissipation mechanism of anchored rock was obtained by slipping ***,bolt energy-absorbing mechanism by instantaneous tensile-shear deformation was expressed based on material mechanics,which was the larger the anchoring angle,the smaller the energy absorption,and the less the co.tribution to supporting efficiency *** this basis,the functional relationship between energy dissipation of anchored rock and energy absorption of bolt was *** the co.l-gangue separation system of Longgu co.l mine as an example,the optimal anchoring angle can be determined as 57.5°–67.5°.Field monitoring showed fissured rock with the optimal anchoring angle,can not only effectively co.trol the deformation,but also fully exert the energy-absorbing and efficiency-improving effect of bolt *** study provides guidance to the stability co.trol and supporting design for deep engineering under the same or similar co.ditions.

关键词： Static and dynamic loads Anchored rock Energy absorption Anchoring angle Engineering verification

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