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1. An effective parallelization algorithm for DEM generalization based on CUDA

Author:
Wu, Qianjiao; Chen, Yumin; Wilson, John P.; Liu, Xuejun; Li, Huifang
Source:
Environmental modelling & software 2019 v.114 pp. 64-74
ISSN:
1364-8152
Subject:
surface roughness,   etc   ; algorithms; landscapes;     Show all 3 Subjects
Abstract:
... An effective parallelization algorithm based on the compute-unified-device-architecture (CUDA) is developed for DEM generalization that is critical to multi-scale terrain analysis. It aims to efficiently retrieve the critical points for generating coarser-resolution DEMs which maximally maintain the significant terrain features. CUDA is embedded into a multi-point algorithm to provide a parallel-m ...
DOI:
10.1016/j.envsoft.2019.01.002

2. Roughness analysis of general-shape particles, from 2D closed outlines to 3D closed surfaces

Author:
Su, Dong; Wang, Xiang; Yang, Hong-Wei; Hong, Chengyu
Source:
Powder technology 2019 v.356 pp. 423-438
ISSN:
0032-5910
Subject:
surface roughness,   etc   ; powders; roughness; texture;     Show all 4 Subjects
Abstract:
... Surface roughness plays an important role in macro and micro-scale granular behaviors; however, there is currently lack of a unified approach to quantify the roughness of closed outlines and surfaces, which can consider the overall morphological characteristics of particles. This paper proposes approaches that are suitable for roughness evaluation of 2D general-shape closed outlines and 3D general ...
DOI:
10.1016/j.powtec.2019.08.042

3. Study on flow regimes and seepage models through open rough-walled rock joints under high hydraulic gradient

Author:
Qian, Xin; Xia, Caichu; Gui, Yang; Zhuang, Xiaoqing; Yu, Qiangfeng
Source:
Hydrogeology journal 2019 v.27 no.4 pp. 1329-1343
ISSN:
1431-2174
Subject:
surface roughness,   etc   ; granite; models; seepage; turbulent flow;     Show all 5 Subjects
Abstract:
... Little attention has been paid to non-Darcy fluid flow through rough-walled rock joints under high hydraulic gradient. Water fluid flow through splitting granite joints was tested beyond the range of previously tested conditions by using an experimental apparatus designed for this study. This apparatus facilitated the quantification of the effects of joint surface roughness and aperture on fluid f ...
DOI:
10.1007/s10040-018-01914-9

4. 2D-3D conversion method for assessment of multiple characteristics of particle shape and size

Author:
Ueda, Takao; Oki, Tatsuya; Koyanaka, Shigeki
Source:
Powder technology 2019 v.343 pp. 287-295
ISSN:
0032-5910
Subject:
surface roughness,   etc   ; algorithms; databases; models; powders;     Show all 5 Subjects
Abstract:
... Accurate assessment of three-dimensional (3D) particle characteristics, such as particle shape and size distribution, is a basic requirement in various fields. In practice, however, two-dimensional (2D) characteristics are often measured instead of 3D, due to limitations of cost, speed, and so on. A conversion method which simultaneously estimates multiple 3D characteristics from measurable multip ...
DOI:
10.1016/j.powtec.2018.11.019

5. Traveling behavior of a termite in tunnels with different curvatures and base surface roughness

Author:
Lee, Sang-Hee
Source:
Journal of Asia-Pacific entomology 2018 v.21 no.1 pp. 258-260
ISSN:
1226-8615
Subject:
surface roughness,   etc   ; Isoptera; roughness;     Show all 3 Subjects
Abstract:
... This study focused on understanding the termite traveling behavior. Artificial tunnels with different curvatures and base surface roughness were constructed. Each tunnel was 50mm in length, with widths of W (W=2, 3, or 4mm). The distance between the two ends of the tunnel was D (D=20, 30, 40, or 50mm). A higher value of D means a lower curvature. The roughness, R (R=60, 120, 240 and ∞), was genera ...
DOI:
10.1016/j.aspen.2018.01.001

6. Calculating wind turbine component loads for improved life prediction

Author:
Rommel, D.P.; Di Maio, D.; Tinga, T.
Source:
Renewable energy 2020 v.146 pp. 223-241
ISSN:
0960-1481
Subject:
surface roughness,   etc   ; gravity; issues and policy; physical models; prediction; renewable energy sources; statistical analysis; systems engineering; wind speed; wind turbines;     Show all 10 Subjects
Abstract:
... Wind turbines life time is commonly predicted based on statistical methods. However, the success of statistics-based maintenance depends on the amount of variation in the system design, usage and load. Life time prediction based on physical models seeks to overcome this drawback by considering the actual design and evaluating the specific usage, load and operating condition of the considered syste ...
DOI:
10.1016/j.renene.2019.06.131

7. Dynamic alterations of hepatocellular function by on-demand elasticity and roughness modulation

Author:
Uto, K.; Aoyagi, T.; DeForest, C. A.; Ebara, M.
Source:
Biomaterials science 2018 v.6 no.5 pp. 1002-1006
ISSN:
2047-4849
Subject:
surface roughness,   etc   ; cell culture; roughness;     Show all 3 Subjects
Abstract:
... Temperature-responsive cell culture substrates reported here can be dynamically programmed to induce bulk softening and surface roughness changes in the presence of living cells. Alterations in hepatocellular function following temporally controlled substrate softening depend on the extent of stiff mechanical priming prior to user-induced material transition. ...
DOI:
10.1039/c8bm00047f

8. Wear and corrosion resistance of Co–P coatings: the effects of current modes

Author:
Li, Ruiqian; Hou, Yuanyuan; Dong, Qiujing; Su, Peibo; Ju, Pengfei; Liang, Jun
Source:
RSC advances 2018 v.8 no.2 pp. 895-903
ISSN:
2046-2069
Subject:
surface roughness,   etc   ; coatings; corrosion; microstructure;     Show all 4 Subjects
Abstract:
... In this work, Co–P coatings were deposited from a chloride-based bath by direct current (DC), pulse current (PC) and pulse reverse current (PRC) methods, respectively. The effects of current modes on the microstructure, composition, microhardness, wear resistance and corrosion resistance of the Co–P coatings were explored. Results showed that the P content in the Co–P coatings increased and the su ...
DOI:
10.1039/c7ra10830c

9. Ultra-low friction of graphene/C60/graphene coatings for realistic rough surfaces

Author:
Li, Haoxuan; Branicio, Paulo S.
Source:
Carbon 2019 v.152 pp. 727-737
ISSN:
0008-6223
Subject:
surface roughness,   etc   ; coatings; friction; graphene; molecular dynamics; simulation models;     Show all 6 Subjects
Abstract:
... The tribological properties of the graphene/C60/graphene sandwich structure are investigated by molecular dynamics simulations. Friction coefficients are calculated for the sandwich structure, composed of graphene layers and a single C60 film layer, i.e. a {111} monolayer of a C60 face centered cubic crystal. The effect of surface roughness on the tribological properties is considered explicitly b ...
DOI:
10.1016/j.carbon.2019.06.020

10. The surface roughness effect on electrochemical properties of La0.5Sr0.5Fe0.7Ga0.3O3-δ perovskite for oxygen transport membranes

Author:
Guironnet, L.; Geffroy, P.-M.; Tessier-Doyen, N.; Boulle, A.; Richet, N.; Chartier, T.
Source:
Journal of membrane science 2019 v.588 pp. 117199
ISSN:
0376-7388
Subject:
surface roughness,   etc   ; artificial membranes; electrochemistry; oxygen; permeability; roughness;     Show all 6 Subjects
Abstract:
... The effect of the membrane surface on the oxygen permeation performances is not studied to sufficient detail in the literature. However, this paper shows that the roughness, and the surface physico-chemistry can have a large effect on the oxygen semi-performances of the membrane, in particular on the kinetics of oxygen exchanges at the surface of the mixed electronic and ionic conductors. For inst ...
DOI:
10.1016/j.memsci.2019.117199

11. Effects of surface morphology on alginate adhesion: Molecular insights into membrane fouling based on XDLVO and DFT analysis

Author:
Li, Renjie; Lou, Yang; Xu, Yanchao; Ma, Guangcai; Liao, Bao-Qiang; Shen, Liguo; Lin, Hongjun
Source:
Chemosphere 2019 v.233 pp. 373-380
ISSN:
0045-6535
Subject:
surface roughness,   etc   ; adhesion; alginates; density functional theory; energy; fouling; thermodynamics;     Show all 7 Subjects
Abstract:
... While surface morphology is the key parameter affecting membrane performance, its exact roles on membrane fouling have not well unveiled. In this study, effects of membrane surface roughness on fouling caused by alginate adhesion were investigated by thermodynamic techniques of the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) approach and density functional theory (DFT). The energy of a singl ...
DOI:
10.1016/j.chemosphere.2019.05.262

12. Effects of the Surface and Atmospheric Stability on the Integral Length Scale at a Coastal Site

Author:
Franco, Ignacio; Gutierrez, Alejandro; Cataldo, José
Source:
Boundary-layer meteorology 2019 v.172 no.2 pp. 317-332
ISSN:
0006-8314
Subject:
surface roughness,   etc   ; anemometers; heat; momentum; turbulent flow; ultrasonics; Uruguay;     Show all 7 Subjects
Abstract:
... We analyze the effects of surface heterogeneity and atmosperic stability on the velocity integral scale at La Paloma, a coastal location in Uruguay, using measurements from three three-dimensional 32-Hz ultrasonic anemometers at heights of 11 m, 40 m, and 66 m for the period December 2016–April 2017. The vertical profiles of heat and momentum fluxes indicate that flow from the sea develops an inte ...
DOI:
10.1007/s10546-019-00442-7

13. Simulation and experimental study on the effect of abrasive size, rotational speed, and machining gap during ultra-precision polishing of monocrystalline silicon

Author:
Mosavat, Mohammad; Rahimi, Abdolreza
Source:
Colloids and surfaces 2019
ISSN:
0927-7757
Subject:
surface roughness,   etc   ; deformation; finishing; hydrodynamics; magnetism; models; silicon; wafers;     Show all 8 Subjects
Abstract:
... Monocrystalline silicon wafers are the key materials for micro-electro-mechanical-systems. These wafers require high surface quality with damage-free subsurface. Because of the high-speed deformation during the ultra-precision polishing of these wafers, Smoothed Particle Hydrodynamics (SPH) which is a meshless method with good self-adaptability can be useful in the simulation of the polishing proc ...
DOI:
10.1016/j.colsurfa.2019.05.005

14. Distributed roughness induced transition on wind-turbine airfoils simulated by four-equation k-ω-γ-Ar transition model

Author:
Yang, Muchen; Xiao, Zhixiang
Source:
Renewable energy 2019 v.135 pp. 1166-1177
ISSN:
0960-1481
Subject:
surface roughness,   etc   ; equations; models; renewable energy sources; roughness; wind turbines;     Show all 6 Subjects
Abstract:
... The fourth transport equation for “roughness amplification” factor Ar, which depends on equivalent sand grain roughness height ks, has been combined with the original three-equation k-ω-γ transition model. According to linear stability theory, the effective length scale of original k-ω-γ model is amplified through Ar, which could enhance the 1st mode time scale and lead to earlier transition. The ...
DOI:
10.1016/j.renene.2018.12.091

15. Nonuniform transitions of heavy-ion irradiated a-C:H films: Structure and antiwear property degradation analysis

Author:
Xu, Jiao; Duan, Zewen; Qiao, Li; Chai, Liqiang; Chen, Zhang; Guo, Dengji; Wang, Peng; Liu, Weimin
Source:
Carbon 2019 v.146 pp. 200-209
ISSN:
0008-6223
Subject:
surface roughness,   etc   ; carbon; diagnostic techniques; hydrogen; ions; irradiation; nickel; steel;     Show all 8 Subjects
Abstract:
... A study on hydrogenated amorphous carbon films (a-C:H) was performed to assess the heavy-ion radiation damage and the nature of defects produced by 1.0 MeV Ni ions of fluences varying between 1014-1015 ions/cm2. The morphology, chemical and optical structures, and mechanical and tribological properties of the films before and after irradiation were examined. Additionally, the effects of nonuniform ...
DOI:
10.1016/j.carbon.2019.02.009

16. On the tensile mechanical characteristics of fine-grained granite after heating/cooling treatments with different cooling rates

Author:
Wu, Qiuhong; Weng, Lei; Zhao, Yanlin; Guo, Baohua; Luo, Tao
Source:
Engineering geology 2019 v.253 pp. 94-110
ISSN:
0013-7952
Subject:
surface roughness,   etc   ; cold treatment; granite; heat; temperature; tensile strength;     Show all 6 Subjects
Abstract:
... This study discusses the results from tests performed to investigate the tensile mechanical characteristics of granite after exposure to heating and cooling treatments. The samples, which were previously heated to various elevated temperatures and then cooled at various cooling rates, were tested using the Brazilian disc method. The variations in the P-wave velocities, microscopic cracks, tensile ...
DOI:
10.1016/j.enggeo.2019.03.014

17. Coating-boosted interfacial thermal transport for carbon nanotube array nano-thermal interface materials

Author:
Qiu, Lin; Guo, Pu; Kong, Qinyu; Tan, Chong Wei; Liang, Kun; Wei, Jun; Tey, Ju Nie; Feng, Yanhui; Zhang, Xinxin; Tay, Beng Kang
Source:
Carbon 2019 v.145 pp. 725-733
ISSN:
0008-6223
Subject:
surface roughness,   etc   ; carbon; carbon nanotubes; coatings; fuels; heat; vapors;     Show all 7 Subjects
Abstract:
... The interfacial thermal transport (ITT) between vertically aligned carbon nanotube (VACNT) arrays and heat sink is the dominant barrier blocking the path towards practical application of VACNT arrays as nano-thermal interface materials (nTIMs). Although developing VACNT arrays with homogeneous heights and larger diameters could lower the thermal contact resistance between the arrays and heat sink ...
DOI:
10.1016/j.carbon.2019.01.085

18. Influence of some structural parameters on the dielectric behavior of materials for textile antennas

Author:
Loss, Caroline; Gonçalves, Ricardo; Pinho, Pedro; Salvado, Rita
Source:
Textile research journal 2019 v.89 no.7 pp. 1131-1143
ISSN:
1746-7748
Subject:
surface roughness,   etc   ; dielectric properties; fabrics; porosity; prototypes; textile fibers;     Show all 6 Subjects
Abstract:
... Knowledge of the electromagnetic properties of textile materials is crucial in order to design wearable antennas. Despite the growth of research studies on textile antennas, the accurate characterization of the dielectric properties of the materials is still a challenge due to the intrinsic inhomogeneity and deformability of textiles. In this work, 11 textile materials were characterized using the ...
DOI:
10.1177/0040517518764000

19. A numerical model for calculation of the restitution coefficient of elastic-perfectly plastic and adhesive bodies with rough surfaces

Author:
Ghanbarzadeh, Ali; Hassanpour, Ali; Neville, Anne
Source:
Powder technology 2019 v.345 pp. 203-212
ISSN:
0032-5910
Subject:
surface roughness,   etc   ; energy; mathematical models; mechanics; powders; roughness;     Show all 6 Subjects
Abstract:
... A contact mechanics model based on Boundary Element Method (BEM) is used to simulate the contact of rough spheres having elastic-perfectly plastic adhesive behaviour. The model has been verified for smooth surfaces with the classical Hertz contact behaviour in elastic regime, JKR theory in the adhesive regime and Thornton and Ning's analytical solution in the elasto-plastic adhesive regime. In thi ...
DOI:
10.1016/j.powtec.2018.12.079

20. A Theoretical Packing Density Model (TPDM) for ordered and disordered packings

Author:
Roquier, G.
Source:
Powder technology 2019 v.344 pp. 343-362
ISSN:
0032-5910
Subject:
surface roughness,   etc   ; crystal structure; models; powders; prediction; skeleton;     Show all 6 Subjects
Abstract:
... In previous papers, the 4-parameter Compressible Packing Model (CPM) was theoretically developed and validated for the packing density of binary mixtures of spheres and crushed aggregate particles. The 4-parameter CPM is now called the Theoretical Packing Density Model (TPDM). The TPDM is a self-consistent packing density model which is now validated for both disordered and ordered packings. Thank ...
DOI:
10.1016/j.powtec.2018.12.033