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Bayesian ensemble methods for predicting ground deformation due to tunnelling with sparse monitoring data

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Underground Space 2024年第3期16卷 79-93页

作者： zilong zhang Tingting zhang Xiaozhou Li Daniel Dias School of Civil Engineering Central South UniversityChangshaHunan 410075China Laboratory 3SR Grenoble Alpes UniversityCNRS UMR 5521Grenoble 38000France

Numerous analytical models have been developed to predict ground deformations induced by tunneling,which is a critical issue in tunnel ***,the accuracy of these predictions is often limited by errors and uncertainties resulting from model selection and parameter fittings,given the paucity of monitoring data in field *** paper proposes a novel approach to estimate tunnelling-induced ground deformations by applying Bayesian model averaging to several representative prediction *** accounting for both model and parameter uncertainties,this approach enables more realistic predictions of ground deformations than individual ***,our results indicate that the Gonzalez-Sagaseta model outperforms other models in predicting ground surface settlements,while the Loganathan-Poulos model is most suitable for predicting subsurface vertical and horizontal ***,our analysis reveals that when monitoring data are sparse,model uncertainties may contribute up to 78.7%of the total ***,obtaining sufficient data for parameter fitting is crucial for accurate *** proposed method in this study offers a more realistic and efficient prediction of tunnelling-induced ground deformations.

关键词： Tunnelling-induced ground deformations Sparse data Model uncertainties Bayesian model averaging

Alternative lead-free mixed-valence double perovskites for high-efficiency photovoltaic applications

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Journal of Energy Chemistry 2023年第9期84卷 347-353页

作者： Wenbo Li Yuheng Li zilong zhang Peng Gao CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina Laboratory for Advanced Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021FujianChina University of Chinese Academy of Sciences Beijing 100049China

Lead-based organic-inorganic hybrid perovskites have exhibited great potential in photovoltaics,achieving power conversion efficiencies(PCEs) exceeding 25%.However,the toxicity of lead and the instability of these materials under moist conditions pose significant barriers to large-scale *** overcome these limitations,researchers have proposed mixed-valence double perovskites,where Cs_(2)Au~ⅠAu~ⅢI_6 is a particularly effective absorber due to its suitable band gap and high absorptance *** further extend the scope of these lead-free materials,we varied the trivalent gold ion and halogen anion in Cs_(2)Au~ⅠAu~ⅢI_6,resulting in 18 new structures with unique ***,using first-principles calculations and elimination criteria,we identified four materials with ideal band gaps,small effective carrier mass,and strong anisotropic optical *** to theoretical modeling,Cs_(2)AuSbCl_6,Cs_(2)AuInCl_6,and Cs_(2)AuBiCl_6 are potential candidates for solar cell absorbers,with a spectroscopic limited maximum efficiency(SLME) of approximately 30% in a 0.25 μm-thick *** three compounds have not been previously reported,and therefore,our work provides new insights into potential materials for solar energy *** aim for this theoretical exploration of novel perovskites to guide future experiments and accelerate the development of high-performance photovoltaic devices.

关键词： Mixed valence double perovskite Theoretical calculation Electronic configuration Photovoltaic performance

NONLINEAR DYNAMICS AND SYNCHRONIZATION OF TWO COUPLED PIPES CONVEYING PULSATING FLUID

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Acta Mechanica Solida Sinica 2014年第2期27卷 162-171页

作者： Qiao Ni zilong zhang Lin Wang Qin Qian Min Tang Hubei Key Laboratory for Engineering Structural Analysis and Safety Assessment Department of Mechanics Huazhong University of Science and Technology

In this paper, the nonlinear dynamical behavior of two coupled pipes conveying pulsating fluid is studied. The connection between the two pipes is considered as a distributed linear spring. Based on this consideration, the equations of motion of the coupled two-pipe system are obtained. The two coupled nonlinear partial differential equations, discretized using the fourth- order Galerkin method, are solved by a fourth-order Runge-Kutta integration algorithm. Results show that the connection stiffness has a significant effect on the dynamical behavior of the coupled system. It is found that for some parameter values the motion types of the two pipes might be synchronous.

关键词： pipe conveying pulsating fluid nonlinear dynamics coupled two-pipe system synchronization

Self-compensation tensor multiplication unit for adaptive approximate computing in low-power CNN processing

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Science China(Information Sciences) 2022年第4期65卷 287-288页

作者： Bo LIU zilong zhang Hao CAI Reyuan zhang Zhen WANG Jun YANG National ASIC System Engineering Center Southeast University Nanjing Prochip Electronic Technology Co.Ltd.

Dear editor,Approximate multiplication is an emerging circuit design technique for AI-based Io T devices using deep neural networks which can reduce energy consumption with acceptable accuracy loss. Digital signal processing with low power consumption is very important for battery-powered devices, such as real-time speech recognition [1] and cuffless blood pressure monitoring [2].

关键词： Approximate multiplication Tensor Multiplication Unit Convolutional neural network Self-compensation Addition tree

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A straightforward spectral emissivity estimating method based on constructing random rough surfaces

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Light(Science & Applications) 2023年第12期12卷 2577-2588页

作者： Zezhan zhang Mengchao Chen Lichuan zhang Hongzu Li Hairui Huang zilong zhang Peifeng Yu Yi Niu Shan Gao Chao Wang Jing Jiang Clean Energy Materials and Engineering Center School of Integrated Circuit Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengduChina College of Information and Communication Engineering Harbin Engineering UniversityHarbinChina Department of Precision Instrument Tsinghua UniversityBeijingChina

Spectral emissivity is an essential and sensitive parameter to characterize the radiative capacity of the solid surface in scientific and engineering applications,which would be non-negligibly affected by surface ***,there is a lack of assessment of the effect of roughness on emissivity and a straightforward method for estimating the emissivity of rough *** paper established an estimating method based on constructing random rough surfaces to predict rough surface(Geometric region)emissivity for metal *** on this method,the emissivity of ideal gray and non-gray body surfaces was calculated and *** calculated and measured spectral emissivities of GH3044,K465,DD6,and TC4 alloys with different roughness were *** results show that the emissivity increases with the roughness degree,and the enhancement effect weakens with the increase of roughness or emissivity due to the existing limit(emissivityε=1.0).At the same time,the roughness would not change the overall spectral distribution characteristics but may attenuate the local features of the spectral *** estimated results are in good agreement with the experimental data for the above alloys'rough *** study provides a new reliable approach to obtaining the spectral emissivity of rough *** approach is especially beneficial for measuring objects in extreme environments where emissivity is difficult to ***,this study promotes an understanding of surface morphology's effect mechanism on emissivity.

关键词： alloys roughness estimating

Highly efficient catalyst for 1,1,2-trichloroethane dehydrochlorination via BN_(3) frustrated Lewis acid-base pairs

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Nano Research 2024年第6期17卷 4773-4781页

作者： Yuxue Yue Fangmin Zuo Bolin Wang Xiaoling Xian Jun Tang Haifeng zhang zilong zhang Qingping Ke Wei Chen School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Industrial Catalysis Institute of Zhejiang University of Technology Hangzhou 310014China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China College of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China

In this study,a novel non-metallic carbon-based catalyst co-doped with boron and nitrogen(B,N)was successfully *** precisely controlling the carbonization temperature of a binary mixed ionic liquid,we selectively modified the doping site structure,ultimately constructing a B,N co-doped frustrated Lewis acid-base pair *** catalyst exhibited remarkable catalytic activity,selectivity,and stability in the dehydrochlorination reaction of 1,1,2-trichloroethane(TCE).Detailed characterization and theoretical calculations revealed that the primary active center of this catalyst was the BN_(3)*** to conventional graphitic N structures,the BN_(3)structure had a higher p-band center,ensuring superior adsorption and activation capabilities for TCE during the *** the BN_(3)site,three negatively charged nitrogen atoms acted as Lewis bases,while positively charged boron atoms acted as Lewis *** synergistic interaction facilitated the specific dissociation of chlorine and hydrogen atoms from TCE,significantly enhancing the 1,1-dichloroethene *** this research,we not only explored the active site structure and catalytic mechanism of B,N co-doped catalysts in depth but also provided an efficient,selective,and stable catalyst for the dehydrochlorination of TCE,contributing significantly to the development of non-metallic catalysts.

关键词： B N co-doped sites dehydrochlorination frustrated Lewis acid-base pairs catalytic mechanism

Study on the structure characterization and moisturizing effect of Tremella polysaccharide fermented from GCMCC5.39

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Food Science and Human Wellness 2021年第4期10卷 471-479页

作者： Meng Yang zilong zhang Yan He Chengliang Li Jinmei Wang Xia Ma School of Perfume and Aroma Technology Shanghai Institute of TechnologyShanghai 201418China Shanghai International Travel Healthcare Center Shanghai Customs District P.R.ChinaShanghai 200335China Laibo Pharmaceutical Technology(Shanghai)Co.Ltd Shanghai 201418China National R&D Center for Edible Fungus Processing Technology Henan UniversityKaifeng 475004China

The structure and moisture retention of Tremella polysaccharide fermented from GCMCC5.39(FTP)were *** UV,infrared spectrum analysis,HPAEC-PAD,HPSEC and 1 D NMR analysis,the composition of the purifi ed FTP was *** ed components of fermented Tremella polysaccharide(FTPS)was made of galactose,mannose,glucose,galactosmine,glucosamine,and contain a large amount of hydroxyl,carbonyl and amino *** wasα-neutral pyranose without uronic ***-1 and FTPS-2 were obtained after purifi cation by DEAE-Sepharose Fast Flow *** molecular weights of FTPS-1 and FTPS-2 were 25722 and 177263 ***-2 had a better ability to prevent moisture loss,and the optimal moisture retention period was 0–4 ***-2 could signifi cantly increase the moisture content of the skin epidermis and showed a dose-concentration *** effect of FTPS-2 on the expression of different moisturizing genes was evaluated in a human skin keratinocyte *** results showed that FTPS-2 has no cytotoxicity,and could signifi cantly promote AQP3,TGM1,CASP14,HYAL2,FLG gene expression level in HaCaT *** has the most signifi cant infl uence at HYAL2 protein expression on 50μg/mL.

关键词： Polysaccharide Tremella spp. Structure identifi cation Moisturizing

Quasi-in-situ investigation on complete lamellar fragmentation of β-solidified TiAl alloy during uniaxial isothermal compression

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Journal of Materials Science & Technology 2024年第19期186卷 132-141页

作者： Yonghao Yu Hongchao Kou Xiaoxuan Xu zilong zhang Yarong Wang Mengyu Jia Yuqing Li Fengming Qiang Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China School of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials ProcessingXi’an University of Architecture and TechnologyXi’an710055China

The coarse as-cast lamellar microstructure in TiAl alloys is difficult to be broken completely by thermomechanical processing. Some remnant lamellar colonies in the deformed microstructure seriously affect the microstructural homogeneity and deteriorate the properties. In this study, it is found that by isothermal compression at 1230 °C and 1250 °C, the lamellar colonies of Ti-43.5Al-4Nb-1Mo-0.1B (TNM) alloys can be completely broken. This is attributed to the weakened anisotropic deformation behavior of the lamellar colonies due to the isothermal holding treatment before deformation. The deformation behavior at 1230 °C was investigated by quasi-in-situ experiments. It is observed that the regions near lamellar colony boundaries first undergo dynamic recrystallization at small strain, while the lamellar colonies gradually break down with increasing strain. The adequate fragmentation of lamellar colonies mainly depends on the recrystallization of α lamellae (αL). The isothermal holding at 1230 °C leads to an increase in the content and thickness of αL, which allows it to assume more deformation and promotes its recrystallization by reaching critical strain. The interrupted γ lamellae (γL) formed by decomposition during isothermal holding facilitates the occurrence of α recrystallization within the lamellar colonies by hindering dislocation movement. In addition, recrystallized γ grains (γR) are gradually dissolved by the formation of α precipitates inside them through the γ → α phase transformation and the subsequent consumption of α precipitates by the recrystallized α grains.

关键词： TiAl alloys Hot compression Lamellar fragmentation Recrystallization

Physical Activity and Different Recommendations Associated with the Dynamic Trajectory of Cardiometabolic Diseases-UK,2006-2021

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China CDC weekly 2022年第51期4卷 1154-1160,I0001-I0004页

作者： Lan Chen Miao Cai Hongtao Zou Shiyu zhang Xiaojie Wang Haitao Li Hualiang Lin zilong zhang Department of Epidemiology School of Public HealthSun Yat-sen UniversityGuangzhouGuangdongChina Department of Social Medicine and Health Service Management Health Science CenterShenzhen UniversityShenzhenGuangdongChina

What is already known about this topic?Previous studies have illustrated the benefits of physical activity on cardiometabolic multimorbidity(CMM),while limited studies have concentrated on the trajectory of CMM *** is added by this report?Through multi-stage regression analysis,we found that physical activity could reduce the risk of CMM *** initially free of cardiometabolic diseases(CMDs)may benefit more from engaging in recommended physical *** are the implications for public health practice?Adults,especially those initially free of CMDs,should engage in WHO-recommended physical activity as early as possible to prevent CMD incidence and further progression.

关键词： CMD CMM Dynamic