检索结果-南通市图书馆

Black phosphorus-based heterostructures for photocatalysis and photoelectrochemical water splitting

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第4期31卷 745-779页

作者： Shutao Li Yihe Zhang hongwei huang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes and School of Materials Science and Technology China University of GeosciencesBeijing 100083China

Semiconductor-based photocatalytic and photoelectrochemical(PEC) processes can convert solar energy into high-density chemical energy or for the treatment of environmental pollutants, which are ideal ways to deal with environmental and energy crises. The development of high-efficiency photocatalysts and photoelectrodes is the key to the in-depth development and practical application of the two *** phosphorus(BP) has excellent physicalcochemical properties such as adjustable band gap, high carrier mobility, large specific surface area and anisotropy, making it one of the most promising ***-based heterostructure can not only realize the effective separation of photogenerated carriers but also improve the stability of BP, and is widely used in photocatalytic and PEC reactions. In this review, we first introduce the crystal structure, band structure, anisotropy, and preparation of BP with different dimensions(bulk, zero-dimension and two-dimension). Then, according to the transfer path of the photogenerated carriers and the components, the BP-based heterostructures are divided into type I heterojunction, type II heterojunction, Z-scheme heterojunction, S-scheme heterojunction, BP/carbonbased material heterostructure, BP/metal heterostructure and multi-component *** are the diverse photocatalytic applications of BP-based heterostructure, such as water splitting and CO_(2)reduction, N_(2)fixation, pollutant degradation, photothermal and photodynamic ***, some concluding views and opinions are stated on the challenges and opportunities faced by the further development of BP-based heterostructures in photocatalysis and PEC water splitting.

关键词： Black phosphorus Heterostructure Photocatalysis Photoelectrochemical water splitting

Layered photocatalytic nanomaterials for environmental applications

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第3期34卷 24-38页

作者： Fang Chen Yihe Zhang hongwei huang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China

The increasing pollution and human demand for a cleaner environment have made achieving the environmental sustainability a current research *** a “green” technology,semiconductor photocatalysis is of great significance to the environmental *** from the unique anisotropic crystal structure and electronic properties,layered photocatalytic nanomaterials show great potential for efficient photocatalytic environmental *** review comprehensively summarizes the recent progress on layered photocatalytic nanomaterials for oxidation or reduction of pollutants in water and air along with the basic understanding of related mechanisms and developments in this ***,the existing diversified layered photocatalysts are classified,and their different synthesis and modification strategies are discussed in detail to provide a comprehensive view of the material design that affects their photocatalytic ***,the extensive applications of the above-mentioned layered photocatalytic nanomaterials in environmental fields are systematically summarized,including photooxidation of water and air pollutants,and photoreduction of heavy metal pollutants,NO_(3)^(-),BrO_(3)^(-) and CO_(2).Finally,based on the current research achievements in layered photocatalysts for environmental remediation,the future development direction and challenges are proposed.

关键词： Layered photocatalytic nanomaterials Layered perovskite oxides Environmental applications Photocatalytic oxidation Photocatalytic reduction

Resilience of city underground infrastructure under multi-hazards impact:From structural level to network level

在线全文

学校读者我要写书评

暂无评论

Resilient Cities and Structures 2022年第2期1卷 76-86页

作者： hongwei huang Dongming Zhang Zhongkai huang Key Laboratory of Geotechnical and Underground Engineering of Minister of Education Department of Geotechnical Engineering and International Joint Research Center for Resilient InfrastructureTongji UniversityShanghai200092China

Underground infrastructure(UI)plays a great important role in the urbanization and modernization of megacities in the ***,the intensive development of the UI during the past decades has posed great risks to the safety of city infrastructures under the impact of multi-hazards,especially with the condition of global climate *** this paper,a general conceptualized framework to assess the resilience of UI in cities under multihazards impact is *** urban tunnel system,e.g.,metro tunnel,road tunnel etc.,is selected as the typical underground infrastructure discussed with the emphasis both on the structural level in terms of mechanical behaviors and system level in terms of network *** hazards discussed in this paper include the natural hazards and human-related ones,with emphasis on earthquake,flood,and aggressive disturbances caused by human *** the general framework proposed for resilience of the structural and network behavior of the UI,two application examples are *** structural resilience of the shield tunnel under earthquake impact is analyzed by using the proposed resilience model,and the network resilience of the road tunnel system under the flood impact due to climate change is analyzed,*** resilience enhancement by using the adaptive design strategy of real-time observational method is mathematically presented in this *** other practical engineering recovery measures are briefly discussed at the end of this application *** findings in the application examples should be helpful to enhance the resilience-based design of the structural and network of tunnels from the component to the system level.

关键词： Underground infrastructure Resilience Multi-hazards Structure Network

Interpreting random fields through the U-Net architecture for failure mechanism and deformation predictions of geosystems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geoscience Frontiers 2024年第1期15卷 209-224页

作者： Ze Zhou Wang Jinzhang Zhang hongwei huang Department of Civil and Environmental Engineering National University of SingaporeSingapore 117576Singapore Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering Tongji UniversityShanghai 200092China

The representation of spatial variation of soil properties in the form of random fields permits advanced probabilistic assessment of slope *** many studies,the safety margin of the system is typically characterized by the term“probability of failure(Pfailure)”.As the intensity and spatial distribution of soil properties vary in different random field realizations,the failure mechanism and deformation field of a slope can vary as *** only can the location of the failure surfaces vary,but the mode of failure also *** information is equally valuable to engineering *** this paper,two slope examples that are modified from a real case study are *** first example pertains to the stability analysis of a multi-layer-slope while the second example deals with the serviceability analysis of a multi-layer c-φ*** addition,due to the large number of simulations needed to reveal the full picture of the failure mechanism,Convolutional Neural Networks(CNNs)that adopt a U-Net architecture is proposed to offer a soft computing strategy to facilitate the *** spatial distribution of the failure surfaces,the statistics of the sliding volume,and the statistics of the deformation field are *** results also show that the proposed deep-learning model is effective in predicting the failure mechanism and deformation field of slopes in spatially variable soils;therefore encouraging probabilistic study of slopes in practical scenarios.

关键词： Deep-learning Spatial variability Slope stability Failure mechanism Sliding volume

Unified modeling of the monotonic and cyclic behaviors of sand and clay

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2015年第2期28卷 111-132页

作者： Yinfu Jin Zhenyu Yin Dongmei Zhang hongwei huang Department of Geotechnical Engineering Tongji University Department of Civil Engineering Shanghai Jiao Tong University LUNAM University Ecole Centrale de Nantes

In this study, we aim to investigate a unified modeling method for the monotonic and cyclic behaviors of sand and clay. A simple double-yield-surface model, with plastic hardening modulus and dilatancy relation being dependent on density state unlike in existing approaches, is developed by considering the location of the critical state line. The model is used to simulate the drained and undrained tests of various sands and clays under monotonic and cyclic loadings. Prediction results are compared with experimental results, which show that the proposed approach is capable of modeling the monotonic and cyclic behaviors of sand and clay.

关键词： sand clay constitutive relations plasticity critical state cyclic loading

Failure responses of rock tunnel faces during excavation through the fault-fracture zone

在线全文

学校读者我要写书评

暂无评论

Underground Space 2023年第3期10卷 166-181页

作者： Zeyu Li hongwei huang Mingliang Zhou Dongming Zhang Department of Geotechnical Engineering Tongji UniversitySiping Road 1239Shanghai 200092China

It is essential to cast light on the construction risks in tunnel excavations through the fault-fracture zone(FFZ).This study adopts the material point method(MPM)to simulate the failure responses of a rock tunnel face during excavation through the FFZ.A numerical study was conducted to compare a physical model test and validate the feasibility of using the MPM in simulating tunnel face *** hundred ninety numerical simulation cases were constructed to represent a rock tunnel excavation project with different site *** simulation results suggest that the cohesion and the friction angle significantly influence failure *** tunnel cover depth can magnify the failure responses,and the FFZ thickness significantly affects the mobilized rock mass volume when the FFZ consists of a weak rock *** numerical simulation results suggest three deformation patterns:face bulge,partial failure,and slide *** failure responses can be characterized by stress arch,slip surface,angle of reposing,and influence *** insights suggested by the face failure responses during excavation through the FFZ can aid field engineers in determining the scope of possible damage,and in establishing emergency measures to minimize losses if such failure occurs.

关键词： Tunnel face failure Rock tunnel excavation Large deformation Fracture fault zone Material point method

Horizontal convergence reconstruction in the longitudinal direction for shield tunnels based on conditional random field

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2023年第3期10卷 118-136页

作者： Jingkang Shi Fei Wang hongwei huang Dongming Zhang Department of Geotechnical Engineering Tongji UniversityShanghai 200092China Shanghai Institute of Disaster Prevention and Relief Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground Engineering of Minister of Education Tongji UniversityShanghai 200092China

Tunnel horizontal convergence monitoring is essential to ensure the operation ***,only a few representative tunnel sec-tions are chosen for monitoring due to the cost *** is difficult to capture the horizontal convergence of each tunnel ring with limited *** with this difficulty,the paper proposes a horizontal convergence reconstruction method based on the measurements of deployed *** tunnel horizontal convergence along the longitudinal direction is seen as a one-dimensional sta-tionary and ergodic random *** reconstruction problem is then transformed into the generation of conditional random *** Carlo simulation is adopted to generate possible realizations and the mean of realizations is considered as the maximum likeli-hood *** analysis proves the effectiveness of the proposed reconstruction *** proposed method is proved to be applicable in reconstructing the time-variant horizontal convergence and is verified by the monitoring results of the shield tunnel of Shanghai Metro Line *** effect of sensor numbers is parametrically studied,and an optimal sensor placement scheme is *** sensors placed at the deformation drastically changed location can significantly improve the performance of the proposed method.

关键词： Structural performance reconstruction Tunnel convergence monitoring Conditional random field Optimal sensor placement

Fluid-solid coupling numerical simulation of micro-disturbance grouting treatment for excessive deformation of shield tunnel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2024年第6期19卷 87-100页

作者： Yanjie Zhang Zheng Cao Chun Liu hongwei huang College of Civil Engineering and Architecture Henan University of TechnologyZhengzhou 450001China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai 200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

Micro-disturbance grouting is a recovery technique to reduce the excessive deformation of operational shield tunnels in urban *** grout mass behaves as a fluid in the ground before hardening to form a grout–soil mixture,which highlights the necessity of using fluid–solid coupling method in the simulation of grouting *** a discrete element modeling environment,this paper proposes a novel fluid-solid coupling method based on the pore density flow *** demonstrate the effectiveness of this method,it is applied to numerical simulation of micro-disturbance grouting process for treatment of large transverse deformation of a shield tunnel in Shanghai Metro,*** simulation results reveal the mechanism of recovering tunnel convergence by micro-disturbance grouting in terms of compaction and fracture of soil,energy analysis during grouting,and mechanical response of soil-tunnel interaction ***,the influence of the three main grouting parameters(i.e.,grouting pressure,grouting distance,and grouting height)on tunnel deformation recovery efficiency is evaluated through parametric *** order to efficiently recover large transverse deformation of shield tunnel in Shanghai Metro,it is suggested that the grouting pressure should be about 0.55 MPa,the grouting height should be in the range of 6.2–7.0 m,and the grouting distance should be in the range of 3.0–3.6 *** results provide a valuable reference for grouting treatment projects of over-deformed shield tunnel in soft soil areas.

关键词： Fluid-solid coupling Discrete element method Pore density flow Micro-disturbance grouting Soil-tunnel interaction

Role of transition metal oxides in g-C_(3)N_(4)-based heterojunctions for photocatalysis and supercapacitors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第1期31卷 214-235,I0007页

作者： Liqi Bai hongwei huang Shixin Yu Deyang Zhang Haitao huang Yihe Zhang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes.School of Materials Science and Technology China University of GeosciencesBeijing 100083China Department of Physics&Department of Materials Science and Engineering City University of Hong KongTat Chee AvenueKowloonHong KongChina Key Laboratory of Microelectronics and Energy of Henan Province Henan Joint International Research Laboratory of New Energy Storage TechnologySchool of Physics and Electronic EngineeringXinyang Normal UniversityXinyang 464000HenanChina Department of Applied Physics and Research Institute for Smart Energy The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

g-C_(3)N_(4) emerges as a star 2D photocatalyst due to its unique layered structure,suitable band structure and low ***,its photocatalytic application is limited by the fast charge recombination and low *** designing g-C_(3)N_(4)-based heterojunction is promising for improving photocatalytic ***,g-C_(3)N_(4) exhibits great potentials in electrochemical energy *** view of the excellent performance of typical transition metal oxides(TMOs)in photocatalysis and energy storage,this review summarized the advances of TMOs/g-C_(3)N_(4) heterojunctions in the above two ***,we introduce several typical TMOs based on their crystal structures and band ***,we summarize different kinds of TMOs/g-C_(3)N_(4) heterojunctions,including type Ⅰ/Ⅱ heterojunction,Z-scheme,p-n junction and Schottky junction,with diverse photocatalytic applications(pollutant degradation,water splitting,CO_(2) reduction and N_(2) fixation)and supercapacitive energy ***,some promising strategies for improving the performance of TMOs/g-C_(3)N_(4) were ***,the exploration of photocatalysis-assisted supercapacitors was discussed.

关键词： Transition metal oxides Carbon nitride Heterojunction Photocatalysis Supercapacitors