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Theory and Method of Power System Integrated Security Region Irrelevant to Operation States: An Introduction Feature Article

Yixin Yu, Yanli Liu, Chao Qin, Tiankai Yang

Engineering 2020, Volume 6, Issue 7, Pages 754-777 doi: 10.1016/j.eng.2019.11.016

Abstract: presents 11 facts and related remarks to introduce the basic concepts, composition, dynamics nature, and topologicaland geometric characteristics of SRs.The most critical finding on the topological and geometric characteristics of SRs is that, within the

Keywords： security Static voltage stability Small-disturbance stability Transient stability Dynamics nature Topologicaland geometric characteristics Hyperplane

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Deformable image registration with geometric changes

Yu LIU,Bo ZHU

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 10, Pages 829-837 doi: 10.1631/FITEE.1500045

Abstract: Geometric changes present a number of difficulties in deformable image registration.In this paper, we propose aglobal deformation framework to model geometric changes whilst promoting aachieve this, we have developed an innovative model which significantly reduces the side effects of geometricintroduction of a sparsity-inducing norm, which is typically L1 norm regularization targeting regions where geometric

Keywords： Geometric changes Image registration Sparsity Traumatic brain injury (TBI)

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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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Probabilistic analysis of secant piles with random geometric imperfections

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3, Pages 682-695 doi: 10.1007/s11709-021-0703-2

Abstract: safe and cost-effective secant-pile wall, a three-dimensional model of a secant pile, considering the geometricBased on the test results, the statistical characteristics of the pile diameters and orientation parametersThe integrity of the secant-pile wall can be overestimated without considering the uncertainty of geometric

Keywords： secant piles ultrasonic cross-hole testing probabilistic analysis reliability-based design random imperfections

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Zinc modification of Ni-Ti as efficient NiZnTi catalysts with both geometric and electronic improvements

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 4, Pages 461-474 doi: 10.1007/s11705-021-2072-8

Abstract: The catalytic hydrogenation of nitroaromatics is an environmentally friendly technology for aniline production, and it is crucial to develop noble-metal-free catalysts that can achieve chemoselective hydrogenation of nitroaromatics under mild reaction conditions. In this work, zinc-modified Ni-Ti catalysts (Ni_xZn_yTi₁) were fabricated and applied for the hydrogenation of nitroaromatics hydrogenation. It was found that the introduction of zinc effectively increases the surface Ni density, enhances the electronic effect, and improves the interaction between Ni and TiO₂, resulting in smaller Ni particle size, more oxygen vacancies, higher dispersion and greater concentration of Ni on the catalyst surface. Furthermore, the electron-rich Ni^δ^– obtained by electron transfer from Zn and Ti to Ni effectively adsorbs and dissociates hydrogen. The results reveal that Ni_xZn_yTi₁ (Ni_0.5Zn_0.5Ti₁) shows excellent catalytic performance under mild conditions (70 °C and 6 bar). These findings provide a rational strategy for the development of highly active non-noble-metal hydrogenation catalysts.

Keywords： bimetal strategy oxygen vacancy non-noble metal catalyst hydrogenation aromatic nitro compounds

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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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“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: oxygen evolution reaction by facilitating the adsorption of oxygenated intermediates by the edge-induced topological

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

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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

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Research on HJ-1A/B satellites data automatic geometric precision correction design

Xiong Wencheng,Shen Wenming,Wang Qiao,Shi Yuanli,Xiao Rulin and Fu Zhuo

Strategic Study of CAE 2014, Volume 16, Issue 3, Pages 37-42

Abstract: The realization of the observation data geometric precision correction is of great significance for macroThe paper analyzed the parameter characteristics of HJ-1satellite and geometric features of HJ-1satellitegeometric precision correction method were designed.Actual operating data showed that the method couldachieve good result for automatic geometric precision correction of HJ-1satellite data，automatic HJ-1CCD image geometric precision correction accuracy could be achieved within two pixels and automatic

Keywords： HJ-1satellite automatic geometric precision correction CCD

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Isogeometric analysis based on geometric reconstruction models

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4, Pages 782-797 doi: 10.1007/s11465-021-0648-0

Abstract: In isogeometric analysis (IGA), the boundary representation of computer-aided design (CAD) and the tensor-product non-uniform rational B-spline structure make the analysis of three-dimensional (3D) problems with irregular geometries difficult. In this paper, an IGA method for complex models is presented by reconstructing analysis-suitable models. The CAD model is represented by boundary polygons or point cloud and is embedded into a regular background grid, and a model reconstruction method is proposed to obtain the level set function of the approximate model, which can be directly used in IGA. Three 3D examples are used to test the proposed method, and the results demonstrate that the proposed method can deal with complex engineering parts reconstructed by boundary polygons or point clouds.

Keywords： isogeometric analysis reconstruction model level set function trimmed element point cloud

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Effects of critical geometric parameters on the optical performance of a conical cavity receiver

Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ

Frontiers in Energy 2019, Volume 13, Issue 4, Pages 673-683 doi: 10.1007/s11708-019-0630-2

Abstract: Most of the literature focuses on the optical performance of receivers with different geometric shapes, but less research is conducted on the effects of critical geometric parameters.

Keywords： parabolic collector conical cavity receiver critical geometric parameters optical performance

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Topological reorganization and functional alteration of distinct genomic components in gallbladder cancer

Frontiers of Medicine doi: 10.1007/s11684-023-1008-8

Abstract: However, knowledge of the topological rearrangement of genomic hierarchical layers in cancer is largely

Keywords： 3D genome cancer TADs loop gene regulation

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Mechanical and geometric advantages in compliant mechanism optimization

Michael Yu WANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 3, Pages 229-241 doi: 10.1007/s11465-009-0066-1

Abstract: This paper presents a focused examination of the mechanical and geometric advantages in compliant mechanismsWith a linear elastic structural analysis, we quantify mechanical (and geometric) advantage in termsIt is shown that the common formulations using mechanical (or geometric) advantage would directly emulate

Keywords： compliant mechanisms topology optimization mechanical advantage pseudo rigid-body mechanisms