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Pushing the activity of CO2 electroreduction by system engineering

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Science Bulletin 2019年第24期64卷 1805-1816页

作者： Hao Shen Zhengxiang gu gengfeng Zheng Laboratory of Advanced Materials Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University

As a promising technology that may solve global environmental challenges and enable intermittent renewable energy storage as well as zero-carbon-emission energy cycling, the carbon dioxide reduction reaction has been extensively studied in the past several years. Beyond the fruitful progresses and innovations in catalysts, the system engineering-based research on the full carbon dioxide reduction reaction is urgently needed toward the industrial application. In this review, we summarize and discuss recent works on the innovations in the reactor architectures and optimizations based on system engineering in carbon dioxide reduction reaction. Some challenges and future trends in this field are further discussed, especially on the system engineering factors.

关键词： CO2 reduction Electrocatalysis Flow-cell electrolyzer Catalytic reactor engineering Artificial photosynthesis

Epitaxial growth of Fe/Ag single crystal superlattices and their magnetic properties

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International journal of Minerals,Metallurgy and Materials 2009年第1期16卷 71-76页

作者： Yu gu Fei Zeng Fang Lv Yu-li gu Pei-yong Yang Feng Pan Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China

Single crystal Fe/Ag（001） superlattices with various periodicities were fabricated using ultrahigh vacuum evaporation deposition. It was found that single crystal bcc Fe layers and single crystal fcc Ag layers can epitaxially grow on a single crystal Ag buffer layer alternately, which was deposited on NaCl single crystal chips by ion beam assisted deposition. The magnetic measurements of the superlattices reveal an oscillation coupling between ferromagnetism and antiferromagnetism as a function of the Ag layer thickness. The oscillation period, which is 1 nm （5 Ag layers）, is in good agreement with the calculated values when the Ag thickness is greater than 1.5 nm. While the thickness of the Ag spacer layer decreases to 1 nm, the oscillation coupling varies from calculations, which can be attributed to the intermixing of the interlayers according to the annealing results.

关键词： Fe/Ag superlattices magnetization oscillating periodicity annealing

Critical state shear behavior of the soil-structure interface determined by discrete element modeling

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Particuology 2017年第6期15卷 68-77页

作者： Xiaoqiang gu Yuanwen Chen Maosong Huang Department of Ceotechnical Engineering Tongii University Shanghai 200092 China Key Laboratory of Ceotechnical and Underground Engineering of the Ministry of Education Shanghai 200092 China

The interface between soil and structure can be referred to as a soil-structure system, and its behavior plays an important role in many geotechnical engineering practices, In this study, results are presented from a series of monotonic direct shear tests performed on a sand-structure interface under constant normal stiffness using the discrete element method （DEM）. Strain localization and dilatancy behavior of the interface is carefully examined at both macroscopic and microscopic scales. The effects of soil initial relative density and normal stress on the interface shear behavior are also investigated, The results show that a shear band progressively develops along the structural surface as shear displacement increases. At large shear displacement a unique relationship between stress ratio and void ratio is reached in the shear band for a certain normal stress, indicating that a critical state exists in the shear band. It is also found that the thickness and void ratio of the shear band at the critical state decreases with increasing normal stress. Comparison of the DEM simulation results with experimental results provides insight into the shear behavior of a sand-structure interface and offers a means for quantitative modeling of such interfaces based on the critical state soil mechanics.

关键词： Discrete element method Interface Direct shear test Shear band Dilatancy Critical state

南京市旧改型菜市场街区活力影响因素分析——以科巷菜市场街区为例

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城市建筑 2025年第01期22卷 115-119+166页

作者：顾天峣方遥南京工业大学建筑学院

在我国城市更新工作注重基础设施建设的背景下，近年来南京市大力开展菜市场旧改工作，由此诞生了一批活力度较高的菜市场街区。文章选取科巷菜市场街区作为典型案例，通过对热力图、人口构成、业态构成等数据的收集与分析，探索菜市场... 详细信息

在我国城市更新工作注重基础设施建设的背景下，近年来南京市大力开展菜市场旧改工作，由此诞生了一批活力度较高的菜市场街区。文章选取科巷菜市场街区作为典型案例，通过对热力图、人口构成、业态构成等数据的收集与分析，探索菜市场街区活力的影响因素，最终确定公共交通设施、人口年龄构成和业态构成是影响菜市场街区活力的因素。

关键词：城市更新旧改型菜市场街区活力影响因素

Mapping Sea Level Rise Behavior in an Estuarine Delta System：A Case Study along the Shanghai Coast

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Engineering 2018年第1期4卷 156-163页

作者： H.Q. Cheng j.Y. Chen Z.j. Chen R.L. Ruan g.Q. Xu g. Zeng j.R. Zhu Z.j. Dai X.Y. Chen S.H. gu X.L. Zhang H.M. Wang State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China Shanghai Water Planning Design and Research Institute Shanghai 200232 China Shanghai Water Authority Shanghai 200050 China School of Urban and Regional Science East China Normal University Shanghai 200062 China School of Ecological and Environmental Sciences East China Normal University Shanghai 200062 China Shanghai Hydrological Station Shanghai 200232 China Shanghai Municipal Bureau of Urban Planning and Land Resources Shanghai 200003 China Shanghai Institute of geological Survey Shanghai 200072 China

Sea level rise （SLR） is a major projected threat of climate change that is expected to affect developing coastal cities located in estuarine delta regions, Shanghai is one such city, being located in the Yangtze River Delta （YRD）, It is difficult, however, for decision-makers to implement adaptation due to the uncer- tain causes, magnitudes, and timings of SLR behaviors, This paper attempts to map the causes and mag- nitudes of SLR behaviors on a decadal scale, We analyze the tidal level records from 11 tidal gauge stations and the corresponding bathymetry measurements around these stations since 1921, We identify three new SLR behaviors along the Shanghai coast due to anthropogenic geomorphologic changes （AgCs）, besides the well-known eustatic sea level rise （ESLR）, tectonic subsidence （TS）, and urban land subsidence （ULS）, The first new behavior is regional sea level rise （RSLR）, which occurs as a result of land reclamation and deep waterway regulation, The second is regional sea level fall （RSLF）, which occurs because the channel bed is eroded due to sediment supply decline in the river catchment, The last SLR behavior is local tidal datum rise （LTDR）. Thus, we project that the magnitude of SLR for the Shanghai coast ranges from 10 cm to 16 cm from 2011 to 2030, Clarifying SLR behaviors is important to aid local decision- makers in planning structural and non-structural measures to combat escalating flood damage costs in an estuarine delta system; this field is full of future challenges,

关键词： Sea level rise behavior Anthropogenic geomorphologic change Local tidal datum Flood management Adaptation

Prediction of cutting forces in flank milling of parts with non-developable ruled surfaces

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Chinese journal of Aeronautics 2019年第7期32卷 1788-1796页

作者： Liping WANg Hao SI Liheng gu Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Beijing Beiyi Machine Tool Co.Ltd. Beijing101300China

Predicting the cutting forces required for five-axis flank milling is a challenging task due to the difficulties involved in determining the Undeformed Chip Thickness(UCT) and CutterWorkpiece Engagement(CWE). To solve these problems, this paper presents a new mechanistic cutting force model based on the geometrical analysis of a flank milling process. In the model,the part feature and corresponding cutting location data are taken as input information. The UCT considering cutter runout is calculated according to the instantaneous feed rate of the element cutting edges. A solid-discrete-based method is used to precisely and efficiently identify the CWE between the end mill and the surface being machined. Then, after calibrating the specific force coef-ficients, the mechanistic milling force can be obtained. During the validation process, two practical operations, three-axis flank milling of a vertical surface and five-axis flank milling of a nondevelopable ruled surface, are conducted. Comparisons between predicted and measured cutting forces demonstrate the reliability of the proposed cutting force model.

关键词： Chip thickness Cutting force Five-axis flank milling Machining Ruled surface

Predicting diamond-like Co-based chalcogenides as unconventional high temperature superconductors

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Science Bulletin 2018年第20期63卷 1338-1344页

作者： jiangping Hu Yuhao gu Congcong Le Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Kavli Institute of Theoretical Sciences University of Chinese Academy of SciencesBeijing 1O0190China Collaborative Innovation Center of Quantum Matter Beijing 100049China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsInstitute of Theoretical and Computational ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

We predict Co-based chalcogenides with a diamond-like structure can host unconventional high temperature superconductivity(high-Tc). The essential electronic physics in these materials stems from the Co layers with each layer being formed by vertex-shared CoA_4(A=S, Se, Te) tetrahedra complexes, a material genome proposed recently by us to host potential unconventional high-Tcclose to a d7 filling configuration in 3 d transition metal compounds. We calculate the magnetic ground states of different transition metal compounds with this structure. It is found that(Mn, Fe, Co)-based compounds all have a g-type antiferromagnetic(AFM) insulating ground state while Ni-based compounds are paramagnetic *** AFM interaction is the largest in the Co-based compounds as the three t2 gorbitals all strongly participate in AFM superexchange interactions. The abrupt quenching of the magnetism from the Co to Ni-based compounds is very similar to those from Fe to Co-based pnictides in which a C-type AFM state appears in the Fe-based ones but vanishes in the Co-based ones. This behavior can be considered as an electronic signature of the high-Tcgene. Upon doping, as we predicted before, this family of Co-based compounds favor a strong d-wave pairing superconducting state.

关键词： Iron-based superconductors Cuprates Cobalt chalcogenides d-wave pairing symmetry

声音视角下的场所精神营建探析——以重庆市国际村社区为例

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华中建筑 2025年第1期43卷 40-43页

作者：冯钰暄顾红男重庆大学建筑与城市规划学院

在当今的城市与建筑设计进程中,场所因具有承载记忆、唤起人们认同感等功能而成为设计追求的重要目标。人对场所的感知要从身体的体验获得,声音在人的体验过程以及场所精神的营造中占据着重要的位置。声音可以加强人们的视觉体验、唤起... 详细信息

在当今的城市与建筑设计进程中,场所因具有承载记忆、唤起人们认同感等功能而成为设计追求的重要目标。人对场所的感知要从身体的体验获得,声音在人的体验过程以及场所精神的营造中占据着重要的位置。声音可以加强人们的视觉体验、唤起人们的集体记忆、引发人们的诗意联想。研究如何从声音的角度塑造场所至关重要。该文结合场所以及场所精神的理论,从人本体验的角度阐释声音在场所营建中的作用,并以重庆市渝中区国际村社区为例,探讨以声音为主的场所构建方法。

关键词：场所场所精神声音营建

Temperature-feedback upconversion nanocomposite creates a new strategy for photothermal therapy

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Science Bulletin 2017年第4期62卷 229-230页

作者： Shuang Zhu Zhanjun gu Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Institute of High Energy Physics and National Center for Nanosciences and Technology Chinese Academyof Sciences Beijing 100049 China

An upconversion nanocomposite containing photothermal material that can be served as an ideal probe to real-time monitor microscopic temperature during photothermal therapy(PTT)in biological system was described in a paper on Nature Communications[1].This temperature-feedback upconversion nanocomposite is shown to be able to reach high temperature at microscopic scale as to implement PTT for cancer treatment while keeping the temperature of lesion at low level to prevent damage to normal tissue in real biosystems.

关键词：纳米复合材料温度反馈癌症治疗上转换光热生物系统实时监控微观尺度