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1. Fast and efficient particle packing algorithms based on triangular mesh

Author:
Zhang, Kaiyu; Liu, Feng; Zhao, Gaofeng; Xia, Kaiwen
Source:
Powder technology 2020 v.366 pp. 448-459
ISSN:
0032-5910
Subject:
topology,   etc   ; algorithms; equations; geometry;     Show all 4 Subjects
Abstract:
... The point of departure for the particle-based discrete element simulations is the generation of disk or sphere packing of interest domain. In this paper, based on a triangular mesh, two geometric packing algorithms are proposed for 2D problems. New disk(s) are obtained element-wise by solving system of equations, which can be easily derived according to the local topological relationships. In this ...
DOI:
10.1016/j.powtec.2020.01.079

2. Topological relations between spherical spatial regions with holes

Author:
Shen, Jingwei; Zhang, Lan; Chen, Min
Source:
International journal of digital earth 2020 v.13 no.4 pp. 429-456
ISSN:
1753-8955
Subject:
topology,   etc   ; geography; models;     Show all 3 Subjects
Abstract:
... There is growing interest in globally modelling the entire planet. Although topological relations between spherical simple regions and topological relations between regions with holes in the plane have been investigated, few studies have focused on the topological relations between spherical spatial regions with holes. The 16-intersection model (16IM) is proposed to describe the topological relati ...
DOI:
10.1080/17538947.2018.1523958

3. FSM: Fast and scalable network motif discovery for exploring higher-order network organizations

Author:
Wang, Tao; Peng, Jiajie; Peng, Qidi; Wang, Yadong; Chen, Jin
Source:
Methods 2020 v.173 pp. 83-93
ISSN:
1046-2023
Subject:
topology,   etc   ; algorithms; system optimization;     Show all 3 Subjects
Abstract:
... Networks exhibit rich and diverse higher-order organizational structures. Network motifs, which are recurring significant patterns of inter-connections, are recognized as fundamental units to study the higher-order organizations of networks. However, the principle of selecting representative network motifs for local motif based clustering remains largely unexplored. We present a scalable algorithm ...
DOI:
10.1016/j.ymeth.2019.07.008

4. Expandable deep learning for real-time economic generation dispatch and control of three-state energies based future smart grids

Author:
Yin, Linfei; Gao, Qi; Zhao, Lulin; Wang, Tao
Source:
Energy 2020 v.191 pp. 116561
ISSN:
0360-5442
Subject:
topology,   etc   ; algorithms; energy; models;     Show all 4 Subjects
Abstract:
... This paper proposes a three-state energy model, which contains three states, i.e., generator, power load and closed states. Besides, this paper proposes an expandable deep learning for the real-time economic generation dispatch and control of three-state energies based future smart grids. Although three-state energies will interconnected into or disconnected from future smart grids with varying to ...
DOI:
10.1016/j.energy.2019.116561

5. Three-Dimensional DNA-Programmable Nanoparticle Superlattices

Author:
Kahn, Jason S.; Minevich, Brian; Gang, Oleg
Source:
Current opinion in biotechnology 2020
ISSN:
0958-1669
Subject:
topology,   etc   ; DNA; nanoparticles;     Show all 3 Subjects
Abstract:
... In recent decades, there have been considerable efforts made in the design and synthesis of materials comprised of functional nanoscale particles. However, there is an increasing need to establish platform approaches for creating large-scale three-dimensional (3D) organizations from these particles, with the ability to control and prescribe ordered structures. The use of DNA, as a means of program ...
DOI:
10.1016/j.copbio.2019.12.025

6. Strong contacts, connectivity and fabric anisotropy in granular materials: A 3D perspective

Author:
Liu, Jiaying; Zhou, Wei; Ma, Gang; Yang, Shuhan; Chang, Xiaolin
Source:
Powder technology 2020 v.366 pp. 747-760
ISSN:
0032-5910
Subject:
topology,   etc   ; anisotropy; fabrics; mechanical properties;     Show all 4 Subjects
Abstract:
... The micro-structural fabric and topology play a key role in macroscopic responses of granular materials. Generally, the contact network is formed by connecting centers of interactive particles, which could be divided into strong and weak contact subsets. Different topological, geometrical and mechanical characteristics could be found for the two parts of network, and the threshold is somehow artif ...
DOI:
10.1016/j.powtec.2020.03.018

7. Sparse learning of network-reduced models for locating low frequency oscillations in power systems

Author:
Ping, Zuowei; Li, Xiuting; He, Wei; Yang, Tao; Yuan, Ye
Source:
Applied energy 2020 v.262 pp. 114541
ISSN:
0306-2619
Subject:
topology,   etc   ; models; renewable energy sources;     Show all 3 Subjects
Abstract:
... With increasing penetration intermittent renewable energy and the interactions between different power sources in an interconnected system, low frequency oscillations may occur and potentially threaten the security of power systems if the grid cannot support adequate damping. Locating sources of low frequency oscillations is of great importance, which needs finding the mechanism of the damping of ...
DOI:
10.1016/j.apenergy.2020.114541

8. Emergence of Type-I and Type-II Dirac line nodes in penta-octa-graphene

Author:
Gao, Heng; Ren, Wei
Source:
Carbon 2020 v.158 pp. 210-215
ISSN:
0008-6223
Subject:
topology,   etc   ; crystal structure; graphene; models;     Show all 4 Subjects
Abstract:
... Carbon allotropes have a large family of materials with varieties of crystal structures and properties and can realize different topological phases. Using first principles calculations, we predict a new two-dimensional (2D) carbon allotrope, namely penta-octa-graphene, which consists of pentagonal and octagonal carbon rings. We find that penta-octa-graphene can host both type-I and type-II Dirac l ...
DOI:
10.1016/j.carbon.2019.11.083

9. A 3D sketch-based formulation to model salt bodies from seismic data

Author:
Motta, Suellen; Montenegro, Anselmo; Gattass, Marcelo; Roehl, Deane
Source:
Computers & geosciences 2020 pp. 104457
ISSN:
0098-3004
Subject:
topology,   etc   ; computers; geometry; geophysics; hydrocarbons;     Show all 5 Subjects
Abstract:
... Accurate delineation of geobodies is one of the major tasks of hydrocarbon exploration from three-dimensional seismic data. Salt bodies, in particular, are one of the toughest geobodies to model. Their natural process of formation leads to their complex geometry and topology. With the increasing size of acquisition data every year, traditional manual delineation methods become increasingly labor-i ...
DOI:
10.1016/j.cageo.2020.104457

10. Internal short circuit detection for lithium-ion battery pack with parallel-series hybrid connections

Author:
Pan, Yue; Feng, Xuning; Zhang, Mingxuan; Han, Xuebing; Lu, Languang; Ouyang, Minggao
Source:
Journal of cleaner production 2020 v.255 pp. 120277
ISSN:
0959-6526
Subject:
topology,   etc   ; algorithms; energy; lithium batteries; mathematical theory;     Show all 5 Subjects
Abstract:
... Internal short circuit is one of the unsolved safety problems that may trigger the thermal runaway of lithium-ion batteries. This paper aims to detect the internal short circuit that occurs in battery pack with parallel-series hybrid connections based on the symmetrical loop circuit topology. The theory of the symmetrical loop circuit topology answers the question that: 1) How to locate an exact i ...
DOI:
10.1016/j.jclepro.2020.120277

11. Tunable, multi-modal, and multi-directional vibration energy harvester based on three-dimensional architected metastructures

Author:
Sun, Rujie; Li, Qinyu; Yao, Jianfei; Scarpa, Fabrizio; Rossiter, Jonathan
Source:
Applied energy 2020 v.264 pp. 114615
ISSN:
0306-2619
Subject:
topology,   etc   ; deformation; electronics; energy; geometry; harvesting; vibration;     Show all 7 Subjects
Abstract:
... Conventional vibration energy harvesters based on two-dimensional planar layouts have limited harvesting capacities due to narrow frequency bandwidth and because their vibratory motion is mainly restricted to one plane. Three-dimensional architected structures and advanced materials with multifunctional properties are being developed in a broad range of technological fields. Structural topologies ...
DOI:
10.1016/j.apenergy.2020.114615

12. Archaeological implications of ethnographically grounded functional study of pottery from Nyanga, Zimbabwe

Author:
Nyamushosho, Robert T.; Chirikure, Shadreck
Source:
Quaternary international 2020
ISSN:
1040-6182
Subject:
topology,   etc   ; archaeology; culture and humanities; Zimbabwe;     Show all 4 Subjects
Abstract:
... The value of typological analyses of pottery in global archaeology is widely acknowledged. However, pottery typologies in southern Africa are frequently criticised for one-dimensionally revealing more about decorations on pots and not their function and meaning to people that made and used them. This motivated an experiment to combine functional and stylistic variables of pottery from modern-day N ...
DOI:
10.1016/j.quaint.2020.03.041

13. Developing a new framework based on solid models for 3D cadastres

Author:
Knoth, Laura; Atazadeh, Behnam; Rajabifard, Abbas
Source:
Land use policy 2020 v.92 pp. 104480
ISSN:
0264-8377
Subject:
topology,   etc   ; cadasters; geometry; issues and policy; models;     Show all 5 Subjects
Abstract:
... 3D cadastres aim to record, manage, and visualise spatial dimensions of volumetric legal objects in a 3D digital information environment. Definition of the geometry and topology of volumetric representations of legal objects is predicated on solid modelling approaches which are widely used in 3D modelling applications. Some solid modelling approaches are more user friendly for constructing legal o ...
DOI:
10.1016/j.landusepol.2020.104480

14. Efficient match pair selection for oblique UAV images based on adaptive vocabulary tree

Author:
Jiang, San; Jiang, Wanshou
Source:
ISPRS journal of photogrammetry and remote sensing 2020 v.161 pp. 61-75
ISSN:
0924-2716
Subject:
topology,   etc   ; algorithms; data collection; unmanned aerial vehicles;     Show all 4 Subjects
Abstract:
... The primary contribution of this paper is an efficient match pair selection method for oblique unmanned aerial vehicle (UAV) images. First, high overlap degrees and spatial resolutions cause image and feature redundancies in vocabulary tree building and image indexing. To cope with this issue, an image selection strategy and a feature selection strategy are designed to decrease the total number of ...
DOI:
10.1016/j.isprsjprs.2019.12.013

15. Robust Topological States in Bi₂Se₃ against Surface Oxidation

Author:
Yang, Jiali; Zheng, Baobing; Chen, Zhongjia; Xu, Wangping; Wang, Rui; Xu, Hu
Source:
Journal of physical chemistry 2020 v.124 no.11 pp. 6253-6259
ISSN:
1932-7455
Subject:
topology,   etc   ; bismuth; oxidation; physical chemistry; selenides;     Show all 5 Subjects
Abstract:
... Nontrivial surface states in topological insulators originate from the bulk band topology and thus are protected against nonmagnetic surface perturbations. However, previous theoretical findings exhibit the fragility of surface electronic properties caused by surface oxidation in the topological insulator bismuth selenide (Bi₂Se₃) even though the oxidation reaction does not break the time-reversal ...
DOI:
10.1021/acs.jpcc.0c00458

16. Light Scattering Study of Internal Motions of Ultralong Comb-like Chains in Dilute Solutions under Good Solvent Conditions

Author:
Ishaq, Muhammad Waqas; Hao, Nairong; Zhu, Mo; Li, Lianwei
Source:
Macromolecules 2020 v.53 no.2 pp. 558-568
ISSN:
1520-5835
Subject:
topology,   etc   ; light scattering; models; polymers; solvents;     Show all 5 Subjects
Abstract:
... Internal dynamics of polymer chains is one of the most important fundamental problems in polymer physics. This work reports the first example of a dynamic light scattering (DLS) study of internal motions of well-defined ultralong comb-like chains in dilute solutions under good solvent conditions. Using two well-characterized comb-like model samples with controlled parameters and narrow distributio ...
DOI:
10.1021/acs.macromol.9b02057

17. Review of automated fibre placement and its prospects for advanced composites

Author:
Zhang, Leen; Wang, Xiaoping; Pei, Jingyu; Zhou, Yu
Source:
Journal of materials science 2020 v.55 no.17 pp. 7121-7155
ISSN:
0022-2461
Subject:
topology,   etc   ; automation; composite materials; manufacturing; three-dimensional printing; welding;     Show all 6 Subjects
Abstract:
... Fibre placement is a research hot spot for the intelligent manufacturing of advanced composites, and the efficiency of fibre placement has become an important index to evaluate the performance and cost of composite products. The traditional fibre placement method is mainly based on fibre winding (FW). However, the quality stability and placement efficiency are both higher in automated fibre placem ...
DOI:
10.1007/s10853-019-04090-7

18. Grid nano-indentation as full-field measurements

Author:
Gaillard, Y.; Amiot, F.
Source:
Composites 2020 v.132 pp. 105807
ISSN:
1359-835X
Subject:
topology,   etc   ; composite materials; mechanical properties; polymers; statistical analysis;     Show all 5 Subjects
Abstract:
... The use of grid nano-indentation as a full-field measurement tool to investigate the properties of heterogeneous materials is described. Contrarily to the reported approaches which rely on statistical analysis, the mechanical properties fields are analyzed herein relying on a topological description of the sample. The spatial convolution function is approached using Hertz contact theory, and the o ...
DOI:
10.1016/j.compositesa.2020.105807

19. 3D multifractal characterization of computed tomography images of soils under different tillage management: Linking multifractal parameters to physical properties

Author:
Soto-Gómez, Diego; Pérez-Rodríguez, Paula; Vázquez Juíz, Laura; Paradelo, Marcos; López-Periago, J. Eugenio
Source:
Geoderma 2020 v.363 pp. 114129
ISSN:
0016-7061
Subject:
topology,   etc   ; bulk density; computed tomography; macropores; solutes; surface area; tillage;     Show all 7 Subjects
Abstract:
... Multifractal analysis of pore images obtained from X-ray computed tomography (CT) was used to characterize the scaling properties of macropores in soils with different managements and their correspondence with macroscopic physical properties related with the soil functions.We used CT images of twenty undisturbed soil columns to examine the multifractal properties of the pores identified by X-ray c ...
DOI:
10.1016/j.geoderma.2019.114129

20. Insight into particle retention and clogging in porous media; a pore scale study using lattice Boltzmann method

Author:
Parvan, Amin; Jafari, Saeed; Rahnama, Mohammad; Norouzi apourvari, Saeid; Raoof, Amir
Source:
Advances in water resources 2020 v.138 pp. 103530
ISSN:
0309-1708
Subject:
topology,   etc   ; X-radiation; models; permeability; porosity; porous media; water resources;     Show all 7 Subjects
Abstract:
... Particle deposition in porous media alters hydraulic properties including porosity and permeability. The extent of these alterations depends on both porous media structure and its geometrical and topological properties. In the present study, a Lattice Boltzmann modeling is developed and used to systematically simulate particle clogging and to explore the evolution of hydraulic properties using rea ...
DOI:
10.1016/j.advwatres.2020.103530