Journal articles: 'Dual scale'

1

MASUDA, Sachiko, and Hirohisa NOGUCHI. "Dual-scale Meshfree Method." Proceedings of The Computational Mechanics Conference 2003.16 (2003): 953–54. http://dx.doi.org/10.1299/jsmecmd.2003.16.953.

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Marsden, Gary C., Ashok V. Krishnamoorthy, Sadik C. Esener, and Sing H. Lee. "Dual-scale topology optoelectronic processor." Optics Letters 16, no. 24 (December 15, 1991): 1970. http://dx.doi.org/10.1364/ol.16.001970.

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Wang, Ju, Ziheng Cai, Jinlong Yu, Hao Luo, and Chuang Ma. "Nanometer-scale displacement measurement based on an orthogonal dual Michelson interferometer." Chinese Optics Letters 21, no. 10 (2023): 101201. http://dx.doi.org/10.3788/col202321.101201.

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Sun, Qiyu. "Local dual and poly-scale refinability." Proceedings of the American Mathematical Society 133, no. 4 (October 14, 2004): 1175–84. http://dx.doi.org/10.1090/s0002-9939-04-07622-1.

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Zhang, Xiaosheng, Qianli Di, Fuyun Zhu, Guangyi Sun, and Haixia Zhang. "Superhydrophobic Micro/Nano Dual-Scale Structures." Journal of Nanoscience and Nanotechnology 13, no. 2 (February 1, 2013): 1539–42. http://dx.doi.org/10.1166/jnn.2013.5986.

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Srivastava, Sunita, Zaibudeen A. Wahith, Oleg Gang, Carlos E. Colosqui, and Surita R. Bhatia. "Dual‐Scale Nanostructures via Evaporative Assembly." Advanced Materials Interfaces 7, no. 7 (April 2020): 1901954. http://dx.doi.org/10.1002/admi.201901954.

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Li, Shaolin, Xiuhua Guo, Shengli Zhang, Jiang Feng, Kexing Song, and Shuhua Liang. "Arc erosion behavior of TiB2/Cu composites with single-scale and dual-scale TiB2 particles." Nanotechnology Reviews 8, no. 1 (December 31, 2019): 619–27. http://dx.doi.org/10.1515/ntrev-2019-0054.

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AbstractArc erosion behaviors of TiB2/Cu composites with single-scale and dual-scale TiB2 particles fabricated by powder metallurgy were studied. It was revealed that the dual-scale TiB2/Cu composites had fewer structure defects compared with the single-scale TiB2/Cu composites, and TiB2 particles with different size were uniformly distributed in the copper matrix. When the ratio of 2 μm over 50 μm TiB2 particles is 1:2, the density of TiB2/Cu composite is 98.5% and shows best mechanical and thermal properties. The arc duration and energy of TiB2/Cu composites increase with the increase of electric current in contact material testing. Compared with the single-scale TiB2/Cu composites, the arc erosion of dual-scale TiB2/Cu composite with 2 μm+50 μm (1:2) TiB2 was slighter. The anode bulge area and cathode erosion pit of dual-scale TiB2/Cu composite was smaller. The dual-scale TiB2 particles optimize the microstructure and thermal stability of the composite, which is conducive to alleviating arc erosion. The synergistic effect of different sized TiB2 particles in the matrix improved the arc erosion resistance of TiB2/Cu composite during arcing.

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Shadiqi, Muhammad Abdan, Wildan Rusdaul Ulum, Mirra Noor Milla, and Hamdi Muluk. "EVEN THOUGH WE HAD MANY TRIBES, BUT I AM INDONESIA: VALIDATION OF DUAL IDENTITY SCALE." Jurnal Psikologi 19, no. 2 (April 30, 2020): 122–34. http://dx.doi.org/10.14710/jp.19.2.122-134.

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Dual identity has an assumption that subordinate group identity (e.g., ethnic and tribe identity) and superordinate group identity (e.g., national identity) can be simultaneously activated. The dual identity concept is important to examine in Indonesia as the country of thousands of tribes. As an initial step, we should adapt and evaluate a dual identity scale so that later it will become a catalyst for future study on the exploration of the association of dual identity and other factors. This study aims to adapt and evaluate the dual identity scale on the Indonesian sample. We tested the measurement through two collecting data, with 775 of total participants (data 1= 338 participants and data 2= 473 participants). The data were analyzed using exploratory factor analysis (EFA) and confirmatory factor analysis (CFA). We found that the dual identity scale had a good fit model and had satisfactory validity and reliability. The validity and reliability of data 2 are better than data 1. In the data 2, each item of items used ‘tribe’ as a form of subordinate identity to replace ‘ethnic’ in the measurement of the data 1. In data 1, this scale had a significant correlation with ethnic and national identity. The result of EFA and CFA proved that the scale is unidimensional (having one factor) and robust to use in the Indonesian sample. The study also found that the use of ‘tribe’ can explain subordinate identity better than "ethnic" on the scale. This study contributes to a practical implication for using the dual identity scale in Indonesia.

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Salminen, Alec T., Jingkai Zhang, Gregory R. Madejski, Tejas S. Khire, Richard E. Waugh, James L. McGrath, and Thomas R. Gaborski. "Dual-Scale Nanomembranes: Ultrathin Dual-Scale Nano- and Microporous Membranes for Vascular Transmigration Models (Small 6/2019)." Small 15, no. 6 (February 2019): 1970035. http://dx.doi.org/10.1002/smll.201970035.

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Amelino-Camelia, Giovanni, Leonardo Barcaroli, Stefano Bianco, and Laura Pensato. "Planck-Scale Dual-Curvature Lensing and Spacetime Noncommutativity." Advances in High Energy Physics 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/6075920.

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It was recently realized that Planck-scale momentum-space curvature, which is expected in some approaches to the quantum-gravity problem, can produce dual-curvature lensing, a feature which mainly affects the direction of observation of particles emitted by very distant sources. Several gray areas remain in our understanding of dual-curvature lensing, including the possibility that it might be just a coordinate artifact and the possibility that it might be in some sense a by-product of the better studied dual-curvature redshift. We stress that data reported by the IceCube neutrino telescope should motivate a more vigorous effort of investigation of dual-curvature lensing, and we observe that studies of the recently proposed “ρ-Minkowski noncommutative spacetime” could be valuable from this perspective. Through a dedicated ρ-Minkowski analysis, we show that dual-curvature lensing is not merely a coordinate artifact and that it can be present even in theories without dual-curvature redshift.

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Widyasrini, Jati Uji Sekti, and Sri Lestari. "DUAL ROLE CONFLICT, COPING STRESS, AND SOCIAL SUPPORT AS NURSES’ WELL-BEING PREDICTOR." Jurnal Psikologi 19, no. 2 (June 20, 2020): 174–87. http://dx.doi.org/10.14710/jp.19.2.174-187.

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Nurses' well-being is one of the essential factors in achieving happiness. Conflict and stress experienced by the nurse can make the nurse feel the lack of well-being in her life. This study examines dual role conflict, coping stress, and social support as the predictor of nurses' well-being. The respondents of this study were 123 nurses who were obtained through random cluster sampling. The data were collected using four scales: life well-being scale, dual role conflict scale, coping stress scale, and social support scale. Data analysis was done by conducting linear regression. The results show that dual role conflict, coping with stress, and social support can predict nurses' well-being. Dual role conflict, coping with stress, and social support accounted for 27.5% of the nurses' well-being. Social support is the strongest predictor, followed by coping stress and dual role conflict. This research implies that providing adequate social support from both family and co-workers can facilitate the nurses to achieve their well-being. Besides, it is essential to improve the nurses' skills in managing stress so they can balance the coping strategies and handle the dual role conflict constructively. Receiving plenty of social support will encourage the nurse to choose appropriate coping strategies to manage the dual role conflict constructively.

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Hao, Keli, Koji Nagata, and Yi Zhou. "Scale-by-scale energy transfer in a dual-plane jet flow." Physics of Fluids 32, no. 10 (October 1, 2020): 105107. http://dx.doi.org/10.1063/5.0022103.

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Yoon, Sunjae, Dahyun Kim, Ji Woo Hong, Junyeong Kim, and Chang D. Yoo. "Dual-Scale Doppler Attention for Human Identification." Sensors 22, no. 17 (August 24, 2022): 6363. http://dx.doi.org/10.3390/s22176363.

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This paper considers a Deep Convolutional Neural Network (DCNN) with an attention mechanism referred to as Dual-Scale Doppler Attention (DSDA) for human identification given a micro-Doppler (MD) signature induced as input. The MD signature includes unique gait characteristics by different sized body parts moving, as arms and legs move rapidly, while the torso moves slowly. Each person is identified based on his/her unique gait characteristic in the MD signature. DSDA provides attention at different time-frequency resolutions to cater to different MD components composed of both fast-varying and steady. Through this, DSDA can capture the unique gait characteristic of each person used for human identification. We demonstrate the validity of DSDA on a recently published benchmark dataset, IDRad. The empirical results show that the proposed DSDA outperforms previous methods, using a qualitative analysis interpretability on MD signatures.

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Galiceanu, Mircea, Luan Tota de Carvalho, Oliver Mülken, and Maxim Dolgushev. "Dynamics of Dual Scale-Free Polymer Networks." Polymers 9, no. 11 (November 4, 2017): 577. http://dx.doi.org/10.3390/polym9110577.

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Stannard, Andrew, Christopher P. Martin, Emmanuelle Pauliac-Vaujour, Philip Moriarty, and Uwe Thiele. "Dual-Scale Pattern Formation in Nanoparticle Assemblies." Journal of Physical Chemistry C 112, no. 39 (September 9, 2008): 15195–203. http://dx.doi.org/10.1021/jp803399d.

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Isenberg, P., A. Bezerianos, Pierre Dragicevic, and Jean-Daniel Fekete. "A Study on Dual-Scale Data Charts." IEEE Transactions on Visualization and Computer Graphics 17, no. 12 (December 2011): 2469–78. http://dx.doi.org/10.1109/tvcg.2011.160.

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Si, Yifan, Ting Wang, Chuxin Li, Cunlong Yu, Ning Li, Can Gao, Zhichao Dong, and Lei Jiang. "Liquids Unidirectional Transport on Dual-Scale Arrays." ACS Nano 12, no. 9 (July 2, 2018): 9214–22. http://dx.doi.org/10.1021/acsnano.8b03924.

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Gowers, Richard J., Paola Carbone, and Nicodemo Di Pasquale. "A different approach to dual-scale models." Journal of Computational Physics 413 (July 2020): 109465. http://dx.doi.org/10.1016/j.jcp.2020.109465.

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Wang, Guoyin, Guglielmo Scovazzi, Léo Nouveau, Christopher E. Kees, Simone Rossi, Oriol Colomés, and Alex Main. "Dual-scale Galerkin methods for Darcy flow." Journal of Computational Physics 354 (February 2018): 111–34. http://dx.doi.org/10.1016/j.jcp.2017.10.047.

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20

Gneiting, Tilmann. "Normal scale mixtures and dual probability densities." Journal of Statistical Computation and Simulation 59, no. 4 (December 1997): 375–84. http://dx.doi.org/10.1080/00949659708811867.

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21

Kim, Donghyun, Joonwon Kim, Hyun C. Park, Kun-H. Lee, and Woonbong Hwang. "A superhydrophobic dual-scale engineered lotus leaf." Journal of Micromechanics and Microengineering 18, no. 1 (December 3, 2007): 015019. http://dx.doi.org/10.1088/0960-1317/18/1/015019.

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Jun, Gyosik, Dong Gyu Hwang, Daekeun Kim, Suck Won Choi, Jinah Jang, and Woonbong Hwang. "Osseointegration Improvement using Superhydrophilic Dual-scale Implant." Korean Society of Manufacturing Process Engineers 22, no. 6 (June 30, 2023): 10–16. http://dx.doi.org/10.14775/ksmpe.2023.22.06.010.

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23

Sabet, Safa, Moghtada Mobedi, and Turkuler Ozgumus. "A pore scale study on fluid flow through two dimensional dual scale porous media with small number of intraparticle pores." Polish Journal of Chemical Technology 18, no. 1 (March 1, 2016): 80–92. http://dx.doi.org/10.1515/pjct-2016-0013.

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Abstract In the present study, the fluid flow in a periodic, non-isotropic dual scale porous media consisting of permeable square rods in inline arrangement is analyzed to determine permeability, numerically. The continuity and Navier-Stokes equations are solved to obtain the velocity and pressure distributions in the unit structures of the dual scale porous media for flows within Darcy region. Based on the obtained results, the intrinsic inter and intraparticle permeabilities and the bulk permeability tensor of the dual scale porous media are obtained for different values of inter and intraparticle porosities. The study is performed for interparticle porosities between 0.4 and 0.75 and for intraparticle porosities from 0.2 to 0.8. A correlation based on Kozeny-Carman relationship in terms of inter and intraparticle porosities and permeabilities is proposed to determine the bulk permeability tensor of the dual scale porous media.

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Burgess, C. P., L. E. Ibáñez, and F. Quevedo. "Strings at the intermediate scale or is the Fermi scale dual to the Planck scale?" Physics Letters B 447, no. 3-4 (February 1999): 257–65. http://dx.doi.org/10.1016/s0370-2693(99)00006-4.

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Whittle, P. "Approximation in Large-Scale Circuit-Switched Networks." Probability in the Engineering and Informational Sciences 2, no. 3 (July 1988): 279–91. http://dx.doi.org/10.1017/s0269964800000838.

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The most probable equilibrium configuration in a circuit-switched network is determined, in the limit of very large scale, by a primal optimization problem whose dual determines the blocking probabilities. This approximation can be inadequate for moderate scale, and so the blocking probabilities are usually determined by the Erlang fixed-point principle. In this paper, it is shown that there is a “softened” form of the dual natural to the problem. This gives determinations of the blocking probabilities agreeing with those derived from the Erlang principle as far as terms of order (scale)-1. It is more attractive than the Erlang principle, however, in that it has a mathematical basis, provides an extremal principle by its nature, yields immediately the geometric distribution of the numbers of free circuits, and clearly agrees with the “hard” dual in the limit of large scale.

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Ingram, Abigail L., Virginie Lousse, Andrew R. Parker, and Jean Pol Vigneron. "Dual gratings interspersed on a single butterfly scale." Journal of The Royal Society Interface 5, no. 28 (July 29, 2008): 1387–90. http://dx.doi.org/10.1098/rsif.2008.0227.

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Iridescent butterfly wing colours result from the interaction of light with sub-micrometre structures in the scales. Typically, one scale contains one such photonic structure that produces a single iridescent signal. Here, however, we show how the dorsal wings of male Lamprolenis nitida emit two independent signals from two separate photonic structures in the same scale. Multiple independent signals from separate photonic structures within the same sub-micrometre device are currently unknown in animals. However, they would serve to increase the complexity and specificity of the optical signature, enhancing the information conveyed. This could be important during intrasexual encounters, in which iridescent male wing colours are employed as threat displays. Blazed diffraction gratings, like those found in L. nitida , are asymmetric photonic structures and drive most of the incident light into one diffraction order. Similar gratings are used in spectrometers, limiting the spectral range over which the spectrometer functions. By incorporating two interchangeable gratings onto a single structure, as they are in L. nitida , the functional range of spectrometers could be extended.

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DI PIETRO, ELISA, and JACQUES DEMARET. "SCALE FACTOR DUALITY IN STRING BIANCHI COSMOLOGIES." International Journal of Modern Physics D 08, no. 03 (June 1999): 349–61. http://dx.doi.org/10.1142/s0218271899000262.

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We apply the scale factor duality transformations introduced in the context of the effective string theory to the anisotropic Bianchi-type models. We find dual models for all the Bianchi-types [except for types VIII and IX] and construct for each of them its explicit form starting from the exact original solution of the field equations. It is emphasized that the dual Bianchi class B models require the loss of the initial homogeneity symmetry of the dilatonic scalar field.

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Tam, Christopher K. W., and Nikolai N. Pastouchenko. "Fine-Scale Turbulence Noise from Dual-Stream Jets." AIAA Journal 44, no. 1 (January 2006): 90–101. http://dx.doi.org/10.2514/1.18018.

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Griffin, Brandon J., Everett L. Worthington, Don E. Davis, Joshua N. Hook, and Shira Maguen. "Development of the Self-Forgiveness Dual-Process Scale." Journal of Counseling Psychology 65, no. 6 (November 2018): 715–26. http://dx.doi.org/10.1037/cou0000293.

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30

Neifeld, Mark A. "Optical dual-scale architecture for neural image recognition." Applied Optics 34, no. 26 (September 10, 1995): 5920. http://dx.doi.org/10.1364/ao.34.005920.

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31

He, Yang, Chengyu Jiang, Shengkun Wang, Zhibo Ma, and Weizheng Yuan. "Switch isotropic/anisotropic wettability via dual-scale rods." AIP Advances 4, no. 10 (October 2014): 107103. http://dx.doi.org/10.1063/1.4897335.

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Giraud, Rémi, Merlin Boyer, and Michaël Clément. "Multi-scale superpatch matching using dual superpixel descriptors." Pattern Recognition Letters 133 (May 2020): 129–36. http://dx.doi.org/10.1016/j.patrec.2020.02.018.

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Kuentzer, Nina, Pavel Simacek, Suresh G. Advani, and Shawn Walsh. "Permeability characterization of dual scale fibrous porous media." Composites Part A: Applied Science and Manufacturing 37, no. 11 (November 2006): 2057–68. http://dx.doi.org/10.1016/j.compositesa.2005.12.005.

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Shou, Dahua, Lin Ye, and Jintu Fan. "Longitudinal permeability determination of dual-scale fibrous materials." Composites Part A: Applied Science and Manufacturing 68 (January 2015): 42–46. http://dx.doi.org/10.1016/j.compositesa.2014.09.018.

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Sterczewski, Lukasz A., Jonas Westberg, Yang Yang, David Burghoff, John Reno, Qing Hu, and Gerard Wysocki. "Terahertz hyperspectral imaging with dual chip-scale combs." Optica 6, no. 6 (May 31, 2019): 766. http://dx.doi.org/10.1364/optica.6.000766.

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Amelino-Camelia, Giovanni, Leonardo Barcaroli, Giulia Gubitosi, and Niccoló Loret. "Dual redshift on Planck-scale-curved momentum spaces." Classical and Quantum Gravity 30, no. 23 (October 8, 2013): 235002. http://dx.doi.org/10.1088/0264-9381/30/23/235002.

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37

Wen, Zhidong, Shunshuo Cai, Zhe Zhang, Ziye Xu, Qi Song, Kunpeng Zhang, Man Li, Haiyan Shi, Yu Hou, and Zichen Zhang. "Dual-Scale Textured Broadband Si-Based Light Absorber." Nanomaterials 12, no. 23 (December 1, 2022): 4285. http://dx.doi.org/10.3390/nano12234285.

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Various antireflective structures and methods are proposed to solve the optical loss of Si-based absorber devices. Dual-scale structures have received more concern from researchers in recent years. In this study, the finite difference time domain (FDTD) method is employed to investigate deeply the dependence of optical response on the geometric shape and size of structures. The micron cone shows lower reflectivity than other micron structures. Additionally, the lowest reflectivity region moves with the increasing height size of the cone structure. We proposed creatively a nanoripple-cone structure that maintains low reflectivity properties under varying incident angles whether in the visible region or the near-infrared region. Furthermore, the lower reflectivity is obtained with increasing micron cone and decreasing nanoripple. Finally, the dual-scale nanoripple-cone is fabricated directly and cost-effectively by a femtosecond laser instead of a two-step texture-on-texture way. The measured result shows that the high absorption above 98% extends to the mid-infrared region. This study provides directions for the fabrication of wideband Si-based absorber devices to reduce reflectivity, which exhibits a wide application potential and promotes the evolution of multi-laser processing.

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Shou, Dahua, Lin Ye, Youhong Tang, Jintu Fan, and Feng Ding. "Transverse permeability determination of dual-scale fibrous materials." International Journal of Heat and Mass Transfer 58, no. 1-2 (March 2013): 532–39. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.11.017.

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Barnett, Elliott, R. Bruce Robinson, D. Wayne Loveday, and Joe Snyder. "Comparing Plant-Scale Dual- and Mixed-Media Filters." Journal - American Water Works Association 84, no. 6 (June 1992): 76–81. http://dx.doi.org/10.1002/j.1551-8833.1992.tb07378.x.

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Shirtcliffe, N. J., G. McHale, M. I. Newton, G. Chabrol, and C. C. Perry. "Dual-Scale Roughness Produces Unusually Water-Repellent Surfaces." Advanced Materials 16, no. 21 (November 4, 2004): 1929–32. http://dx.doi.org/10.1002/adma.200400315.

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FELDMAN, JOEL, HORST KNÖRRER, and EUGENE TRUBOWITZ. "SINGLE SCALE ANALYSIS OF MANY FERMION SYSTEMS PART 2: THE FIRST SCALE." Reviews in Mathematical Physics 15, no. 09 (November 2003): 995–1037. http://dx.doi.org/10.1142/s0129055x03001783.

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The first renormalization group map arising from the momentum space decomposition of a weakly coupled system of fermions at temperature zero differs from all subsequent maps. Namely, the component of momentum dual to temperature may be arbitrarily large — there is no ultraviolet cutoff. The methods of Part 1 are supplemented to control this special case.

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Cheung, K. C., and L. C. Mooi. "A Comparison Between the Rating Scale Model and Dual Scaling for Likert Scales." Applied Psychological Measurement 18, no. 1 (March 1994): 1–13. http://dx.doi.org/10.1177/014662169401800101.

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Gao, Yang, Zhihong Gan, Min Chen, He Ma, and Xingpeng Mao. "Hybrid Dual-Scale Neural Network Model for Tracking Complex Maneuvering UAVs." Drones 8, no. 1 (December 25, 2023): 3. http://dx.doi.org/10.3390/drones8010003.

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Accurate tracking and predicting unmanned aerial vehicle (UAV) trajectories are essential to ensure mission success, equipment safety, and data accuracy. Maneuverable UAVs exhibit complex and dynamic motion, and conventional tracking algorithms that rely on predefined models perform poorly when unknown parameters are used. To address this issue, this paper introduces a hybrid dual-scale neural network model based on the generalized regression multi-model and cubature information filter (GRMM-CIF) framework. We have established the GRMM-CIF filtering structure to differentiate motion modes and reduce measurement noise. Furthermore, considering trajectory datasets and rates of motion change, a neural network at different scales will be designed. We propose the dual-scale bidirectional long short-term memory (DS-Bi-LSTM) algorithm to address prediction delays in a multi-model context. Additionally, we employ scale sliding windows and threshold-based decision-making to achieve dual-scale trajectory reconstruction, ultimately enhancing tracking accuracy. Simulation results confirm the effectiveness of our approach in handling the uncertainty of UAV motion and achieving precise estimations.

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Moslemipour, Abolfazl, and Saeid Sadeghnejad. "Dual-scale pore network reconstruction of vugular carbonates using multi-scale imaging techniques." Advances in Water Resources 147 (January 2021): 103795. http://dx.doi.org/10.1016/j.advwatres.2020.103795.

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Garces, Elena, Victor Arellano, Carlos Rodriguez-Pardo, David Pascual-Hernandez, Sergio Suja, and Jorge Lopez-Moreno. "Towards Material Digitization with a Dual-scale Optical System." ACM Transactions on Graphics 42, no. 4 (July 26, 2023): 1–13. http://dx.doi.org/10.1145/3592147.

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Existing devices for measuring material appearance in spatially-varying samples are limited to a single scale, either micro or mesoscopic. This is a practical limitation when the material has a complex multi-scale structure. In this paper, we present a system and methods to digitize materials at two scales, designed to include high-resolution data in spatially-varying representations at larger scales. We design and build a hemispherical light dome able to digitize flat material samples up to 11x11cm. We estimate geometric properties, anisotropic reflectance and transmittance at the microscopic level using polarized directional lighting with a single orthogonal camera. Then, we propagate this structured information to the mesoscale, using a neural network trained with the data acquired by the device and image-to-image translation methods. To maximize the compatibility of our digitization, we leverage standard BSDF models commonly adopted in the industry. Through extensive experiments, we demonstrate the precision of our device and the quality of our digitization process using a set of challenging real-world material samples and validation scenes. Further, we demonstrate the optical resolution and potential of our device for acquiring more complex material representations by capturing microscopic attributes which affect the global appearance: we characterize the properties of textile materials such as the yarn twist or the shape of individual fly-out fibers. We also release the SEDDIDOME dataset of materials, including raw data captured by the machine and optimized parameteres.

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Li, Hangyu, Jeroen C. Vink, and Faruk O. Alpak. "A Dual-Grid Method for the Upscaling of Solid-Based Thermal Reactive Flow, With Application to the In-Situ Conversion Process." SPE Journal 21, no. 06 (June 2, 2016): 2097–111. http://dx.doi.org/10.2118/173248-pa.

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Summary Thermal-reactive compositional-flow simulation in porous media is essential to model thermal-oil-recovery processes for extraheavy-hydrocarbon resources, and an example is the in-situ conversion process (ICP) developed by Shell for oil-shale production. Computational costs can be very high for such a complex system, which makes direct fine-scale simulations prohibitively time-consuming for large field-scale applications. This motivates the use of coarse grids for thermal-reactive compositional-flow simulation. However, significant errors are introduced by use of coarse-scale models without carefully computing the appropriate coarse parameters. In this paper, we develop an innovative dual-grid method to effectively capture the fine-scale reaction rates in coarse-scale ICP-simulation models. In our dual-grid method, coupled thermal-reactive compositional-flow equations are solved only on the coarse scale, with the kinetic parameters (frequency factors) calculated on the basis of fine-scale computations, such as temperature downscaling and fine-scale reaction-rate calculation. A dual-grid treatment for the heater-well model is also developed with coarse-scale heater-well indices calculated on the basis of fine-scale well results. The dual-grid heater-well treatment is able to provide accurate heater temperatures. The newly developed dual-grid method is applied to realistic cross-sectional ICP-pattern models with a vertical production well and multiple horizontal heater wells operated subject to fixed and time-varying heater powers. It is shown that the dual-grid model delivers results that are in close agreement with the fine-scale reference results for all quantities of interest. Despite the fact that the dual-grid method is implemented at the simulation-deck level, by use of the flexible scripting and monitor functionalities of our proprietary simulation package, significant computational improvements are achieved for all cases considered.

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Zhang, Fubing, Qun Sun, Jingzhen Ma, Zheng Lyu, and Bowei Wen. "Progressive Collapse of Dual-Line Rivers Based on River Segmentation Considering Cartographic Generalization Rules." ISPRS International Journal of Geo-Information 11, no. 12 (December 6, 2022): 609. http://dx.doi.org/10.3390/ijgi11120609.

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Collapse is a common cartographic generalization operation in multi-scale representation and cascade updating of vector spatial data. During transformation from large- to small-scale, the dual-line river shows progressive collapse from narrow river segment to line. The demand for vector spatial data with various scales is increasing; however, research on the progressive collapse of dual-line rivers is lacking. Therefore, we proposed a progressive collapse method based on vector spatial data. First, based on the skeleton graph of the dual-line river, the narrow and normal river segments are preliminarily segmented by calculating the width of the river. Second, combined with the rules of cartographic generalization, the collapse and exaggeration priority strategies are formulated to determine the handling mode of the river segment. Finally, based on the two strategies, progressive collapse of dual-line rivers is realized by collapse and exaggeration of the river segment. Experimental results demonstrated that the progressive collapse results of the proposed method were scale-driven, and the collapse part had no burr and topology problems, whereas the remaining part was clearly visible. The proposed method can be better applied to progressive collapse of the dual-line river through qualitative and quantitative evaluation with another progressive collapse method.

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48

BEREZOVSKI, ARKADI, MIHHAIL BEREZOVSKI, and JÜRI ENGELBRECHT. "TWO-SCALE MICROSTRUCTURE DYNAMICS." Journal of Multiscale Modelling 03, no. 03 (September 2011): 177–88. http://dx.doi.org/10.1142/s1756973711000479.

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Wave propagation in materials with embedded two different microstructures is considered. Each microstructure is characterized by its own length scale. The dual internal variables approach is adopted yielding in a Mindlin-type model including both microstructures. Equations of motion for microstructures are coupled with the balance of linear momentum for the macromotion, but not coupled with each other. Corresponding dispersion curves are provided and scale separation is pointed out.

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49

Li, Han Ling, Lei Hou, Jun Jie Zhao, De Zhi Lin, and Lin Qiu. "Dual Scaled Stochastic FEM Simulation of Porous Honeycomb Material." Applied Mechanics and Materials 443 (October 2013): 48–52. http://dx.doi.org/10.4028/www.scientific.net/amm.443.48.

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In this paper, a dual-scaled method is introduced to simulate the nonlinear property of porous honeycomb material. In microscopic scale, stochastic analysis upon a detailed representation of the hexagonal cells is applied. In macroscopic scale, coupled fluid-solid PDEs with a modified stochastic item are used to describe the rheology of non-Newtonian property of honeycomb. Semi-discrete finite element method (FEM) is applied to solve the PDEs. Comparison of stochastic dynamic system with definite dynamic system is introduced. Numerical Results of Euler explicit time scheme and Crank-Nicolson semi-implicit time scheme are presented.

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50

Zhou, Haoliang, Shucheng Huang, Jingting Li, and Su-Jing Wang. "Dual-ATME: Dual-Branch Attention Network for Micro-Expression Recognition." Entropy 25, no. 3 (March 6, 2023): 460. http://dx.doi.org/10.3390/e25030460.

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Micro-expression recognition (MER) is challenging due to the difficulty of capturing the instantaneous and subtle motion changes of micro-expressions (MEs). Early works based on hand-crafted features extracted from prior knowledge showed some promising results, but have recently been replaced by deep learning methods based on the attention mechanism. However, with limited ME sample sizes, features extracted by these methods lack discriminative ME representations, in yet-to-be improved MER performance. This paper proposes the Dual-branch Attention Network (Dual-ATME) for MER to address the problem of ineffective single-scale features representing MEs. Specifically, Dual-ATME consists of two components: Hand-crafted Attention Region Selection (HARS) and Automated Attention Region Selection (AARS). HARS uses prior knowledge to manually extract features from regions of interest (ROIs). Meanwhile, AARS is based on attention mechanisms and extracts hidden information from data automatically. Finally, through similarity comparison and feature fusion, the dual-scale features could be used to learn ME representations effectively. Experiments on spontaneous ME datasets (including CASME II, SAMM, SMIC) and their composite dataset, MEGC2019-CD, showed that Dual-ATME achieves better, or more competitive, performance than the state-of-the-art MER methods.

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Journal articles on the topic 'Dual scale'

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