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“Charging” the cigarette butt: heteroatomic porous carbon nanosheets with edge-induced topological defects

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 11, Pages 1755-1764 doi: 10.1007/s11705-023-2318-8

Abstract: nanoparticles (Co, Ni, Fe, etc.) encapsulated within nitrogen-doped carbon materials with abundant edgerate of oxygen evolution reaction by facilitating the adsorption of oxygenated intermediates by the edge-inducedtopological defects.

Keywords： oxygen evolution reaction porous carbon nanosheets Co nanoparticles edge-induced topological defects

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An industrial solution to light-induced degradation of crystalline silicon solar cells

Meng XIE,Changrui REN,Liming FU,Xiaodong QIU,Xuegong YU,Deren YANG

Frontiers in Energy 2017, Volume 11, Issue 1, Pages 67-71 doi: 10.1007/s11708-016-0430-x

Abstract: Boron-oxygen defects can cause serious light-induced degradation (LID) of commercial solar cells basedthe boron-doped crystalline silicon (c-Si), which are formed under the injection of excess carriers inducedIn this contribution, we have demonstrated that the passivation process of boron-oxygen defects can beinduced by applying forward bias for a large quantity of solar cells, which is much more economic than

Keywords： Boron-oxygen defects c-Si solar cells light-induced degradation passivation forward bias

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Tomographic diagnosis of defects in hydraulic concrete structure

ZHAO Mingjie, XU Xibin

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3, Pages 226-232 doi: 10.1007/s11709-008-0027-5

Abstract: The ultrasonic tomographic technology is applied to diagnose the defects in hydraulic concrete structureHowever, the image resolution of multiple defects is not satisfactory.Defects with the orientation perpendicular to the direction of the diagnosis may have higher precision

Keywords： satisfactory processing orientation tomographic diagnosis orientation perpendicular

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Automated classification of civil structure defects based on convolutional neural network

Pierclaudio SAVINO, Francesco TONDOLO

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2, Pages 305-317 doi: 10.1007/s11709-021-0725-9

Abstract: Today, the most commonly used civil infrastructure inspection method is based on a visual assessment conducted by certified inspectors following prescribed protocols. However, the increase in aggressive environmental and load conditions, coupled with the achievement of many structures of the life-cycle end, has highlighted the need to automate damage identification and satisfy the number of structures that need to be inspected. To overcome this challenge, this paper presents a method for automating concrete damage classification using a deep convolutional neural network. The convolutional neural network was designed after an experimental investigation of a wide number of pretrained networks, applying the transfer-learning technique. Training and validation were conducted using a database built with 1352 images balanced between “undamaged”, “cracked”, and “delaminated” concrete surfaces. To increase the network robustness compared to images in real-world situations, different image configurations have been collected from the Internet and on-field bridge inspections. The GoogLeNet model, with the highest validation accuracy of approximately 94%, was selected as the most suitable network for concrete damage classification. The results confirm that the proposed model can correctly classify images from real concrete surfaces of bridges, tunnels, and pavement, resulting in an effective alternative to the current visual inspection techniques.

Keywords： concrete structure infrastructures visual inspection convolutional neural network artificial intelligence

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Mortarless structures based on topological interlocking

Arcady V. DYSKIN, Elena PASTERNAK, Yuri ESTRIN

Frontiers of Structural and Civil Engineering 2012, Volume 6, Issue 2, Pages 188-197 doi: 10.1007/s11709-012-0156-8

Abstract: We review the principle of topological interlocking and analyze the properties of the mortarless structures

Keywords： topological interlocking fragmented structures segmented structures constraint delamination bending stiffness

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Edge preparation methods for cutting tools: a review

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11465-023-0766-y

Abstract: Edge preparation can remove cutting edge defects, such as burrs, chippings, and grinding marks, generatedcutting edge with cutting performance, are briefly introduced.Then, edge preparation methods for cutting tools, in which materials at the cutting edge area are removedto decrease defects and obtain a suitable microgeometry of the cutting edge for machining, are discussedFinally, the future development direction of tool edge preparation technology is prospected.

Keywords： edge preparation method preparation principle cutting edge geometry edge characterization tool performance

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Thermal reffusivity: uncovering phonon behavior, structural defects, and domain size

Yangsu XIE, Bowen ZHU, Jing LIU, Zaoli XU, Xinwei WANG

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 143-157 doi: 10.1007/s11708-018-0520-z

Abstract: size and defect levels of metals, the thermal reffusivity can also uncover phonon behavior, structure defects

Keywords： thermal reffusivity theory phonon behavior structure defects structural thermal domain (STD) size 2D

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Determining casting defects in near-net shape casting aluminum parts by computed tomography

Jiehua LI, Bernd OBERDORFER, Daniel HABE, Peter SCHUMACHER

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 1, Pages 48-52 doi: 10.1007/s11465-018-0493-y

Abstract: near-net shape casting aluminum parts were investigated by computed tomography to determine casting defects(second part), low-pressure die casting (first part) significantly reduced the formation of casting defectsNo significant casting defect was observed in the third part, and this absence of defects indicates thatMoreover, casting defects were mostly distributed along the eutectic grain boundaries.This investigation demonstrated that computed tomography is an efficient method to determine casting defects

Keywords： near-net shape casting aluminum parts casting defects low pressure die casting die casting semi-solid

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Structural design of morphing trailing edge actuated by SMA

Qi WANG, Zhiwei XU, Qian ZHU

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3, Pages 268-275 doi: 10.1007/s11465-013-0261-y

Abstract:

In this paper, the morphing trailing edge is designed to achieve the up and down deflection underlayout programs, a solid model is created in CATIA and the structures of the morphing wing trailing edgeand control system is designed to accomplish the controlling experiment of the morphing wing trailing edgeAt last, via the force analysis, the trailing edge is fabricated with four sections of aluminum alloyless than 4% and response time is less than 6.7 s, the precise controlling of the morphing trailing edge

Keywords： morphing wing trailing edge shape memory alloy digital signal processor PID algorithm

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Frequencies of circular plate with concentric ring and elastic edge support

Lokavarapu Bhaskara RAO,Chellapilla Kameswara RAO

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2, Pages 168-176 doi: 10.1007/s11465-014-0299-5

Abstract:

Exact solutions for the flexural vibrations of circular plates having elastic edge conditions along

Keywords： circular plate frequency elastic edge rigid ring mode switching

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Knife-edge technique for laser cooling

WANG Zhanshan, MA Shanshan, MA Yan, ZHAO Min, LIU Hengbiao

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 4, Pages 468-473 doi: 10.1007/s11465-007-0081-z

Abstract: In the application of knife-edge technique, the temperature of atoms through laser cooling was measuredKnife-edge technique can measure the temperature of an atomic beam through laser cooling.

Keywords： knife-edge technique uniformity coupled transfer fluorescent

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Description and reasoning of integrated topological and directional relation of bodies in 3D space

Liu Xin,Li Chengming and Liu Wenbao

Strategic Study of CAE 2013, Volume 15, Issue 5, Pages 8-13

Abstract: The topological directional regions were described by Allen interval pair[(R1,R2,R3)], where R1,R2 andAccording to definition of integrated topological and direction relation, the qualitative reasoning ofintegrated topological and directional relations were studied.Empirical examples were provided to show the qualitative reasoning process and results of topologicalCombined tables of the integrated topological and directional relations were obtained when the topological

Keywords： spatial relation topological relation direction relation integrated topological and direction relation

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Application of a vertex chain operation algorithm on topological analysis of three-dimensional fractured

Zixin ZHANG, Jia WU, Xin HUANG

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2, Pages 187-208 doi: 10.1007/s11709-017-0391-0

Abstract: Identifying the morphology of rock blocks is vital to accurate modelling of rock mass structures. This paper applies the concepts of directed edges and vertex chain operations which are typical for block tracing approach to block assembling approach to construct the structure of three-dimensional fractured rock masses. Polygon subtraction and union algorithms that rely merely on vertex chain operation are proposed, which allow a fast and convenient construction of complex faces/loops. Apart from its robustness in dealing with finite discontinuities and complex geometries, the advantages of the current methodology in tackling some challenging issues associated with the morphological analysis of rock blocks are addressed. In particular, the identification of complex blocks with interior voids such as cavity, pit and torus can be readily achieved based on the number and the type of loops. The improved morphology visualization approach can benefit the pre-processing stage when analyzing the stability of rock masses subject to various engineering impacts using the block theory and the discrete element method.

Keywords： morphology block assembling vertex operation discontinuities

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Virtual network embedding based on real-time topological attributes

Jian DING,Tao HUANG,Jiang LIU,Yun-jie LIU

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 2, Pages 109-118 doi: 10.1631/FITEE.1400147

Abstract: of a node, such as CPU capacity and bandwidth, to determine how to map a VN, without considering the topologicalIn this paper, a new embedding algorithm is proposed based on real-time topological attributes.

Keywords： Virtual network embedding (VNE) Real-time topological attributes Betweenness centrality Correlation

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Characters of topological relations and its applications in spatial reasoning

Li Chengming and Liu Xiaoli

Strategic Study of CAE 2013, Volume 15, Issue 5, Pages 14-19

Abstract:

In the paper,the formal representation of topological relationships areBased on these characters, the results for com-posite topological relations are introduced.

Keywords： topological relationship composite of topological relations spatial reasoning algbra reasoning logical