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1. Optimal selection of estimator for obtaining an accurate three-dimensional rock fracture orientation distribution

Author:
Huang, Lei; Su, Xuexue; Tang, Huiming
Source:
Engineering geology 2020 v.270 pp. 105575
ISSN:
0013-7952
Subject:
equations,   etc   ; geometry; models; rocks;     Show all 4 Subjects
Abstract:
... Advances in estimating the three-dimensional (3D) orientation distribution include i) the stereology-based Fouché estimator (FE); and ii) its recent modification (MFE), which has one less meshing step and has three modified components compared with the FE. One way to achieve an accurate estimate is by selecting the optimum estimator. Here, we developed a recognizer for the optimum estimator to hel ...
DOI:
10.1016/j.enggeo.2020.105575

2. Perfect valley filter controlled by Fermi velocity modulation in graphene

Author:
Lins, A.R.S.; Lima, Jonas R.F.
Source:
Carbon 2020 v.160 pp. 353-360
ISSN:
0008-6223
Subject:
equations,   etc   ; graphene; magnetism; transmittance;     Show all 4 Subjects
Abstract:
... In this work we investigate the effects of a Fermi velocity modulation in a valley filter in graphene created by a combination of a magnetic and electric barrier. With the effective Dirac equation of the system, we use the transfer matrix formalism to obtain the transmittance. We verify that the valley transport in graphene is very sensitive to a Fermi velocity modulation, which is able to choose ...
DOI:
10.1016/j.carbon.2020.01.031

3. Reevaluation of optimal turbine/motor process drivers selection concept proposed by Wu et al. (2016)

Author:
Variny, Miroslav; Janošovský, Ján
Source:
Journal of cleaner production 2020 v.253 pp. 120029
ISSN:
0959-6526
Subject:
equations,   etc   ; heat; industry; steam;     Show all 4 Subjects
Abstract:
... We respond to the article “Multi-objective optimization for design of a steam system with drivers option in process industries”, published in the Journal of Cleaner Production by Wu et al. (2016), (https://doi.org/10.1016/j.jclepro.2016.04.067). Our aim is to show that a number of incorrect assumptions employed in the analysis methodology together with many inconsistencies, discrepancies and calcu ...
DOI:
10.1016/j.jclepro.2020.120029

4. 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:
equations,   etc   ; algorithms; geometry; topology;     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

5. The hopper angle role on the velocity and solid-fraction profiles at the outlet of silos

Author:
Darias, J.R.; Gella, D.; Fernández, M.E.; Zuriguel, I.; Maza, D.
Source:
Powder technology 2020 v.366 pp. 488-496
ISSN:
0032-5910
Subject:
equations,   etc   ; containers; geometry; silos;     Show all 4 Subjects
Abstract:
... Hoppers are one of the most popular devices implemented to allow precise flow control mechanism when dispensing granulate materials from silos and other containers. Despite its ubiquity in many industrial processes, the effect that hopper geometry has on the flow rate is still poorly understood. In this work, we study the influence of the hopper angle on the main two variables that determine the f ...
DOI:
10.1016/j.powtec.2020.02.061

6. Omega, Sadhana, and PI Polynomials of Quasi-Hexagonal Benzenoid Chain

Author:
Idrees, Nazeran; Saif, Muhammad Jawwad; Nasir, Sumiya; Farooq, Fozia Bashir; Rauf, Asia; Ashfaq, Fareeha
Source:
Journal of Analytical Methods in Chemistry (Online) 2020 v.2020
ISSN:
2090-8873
Subject:
equations,   etc   ; chemical structure; graphs;     Show all 3 Subjects
Abstract:
... Counting polynomials are important graph invariants whose coefficients and exponents are related to different properties of chemical graphs. Three closely related polynomials, i.e., Omega, Sadhana, and PI polynomials, dependent upon the equidistant edges and nonequidistant edges of graphs, are studied for quasi-hexagonal benzenoid chains. Analytical closed expressions for these polynomials are der ...
DOI:
10.1155/2020/9057815
PubMed:
32309011
PubMed Central:
PMC7136778

7. Effective interaction between colloids immersed in a polymer blend and their effect on the equation of state of this blend

Author:
Chervanyov, A.I.
Source:
Journal of colloid and interface science 2020 v.563 pp. 156-167
ISSN:
0021-9797
Subject:
equations,   etc   ; colloids; compressibility; polymers;     Show all 4 Subjects
Abstract:
... Owing to the entropic interactions between polymers comprising a blend and surfaces of colloids immersed in this blend, the polymer inter-phases are formed between the colloids and blend. These inter-phases that are non-uniform both in density and composition, mediate the effective interaction between colloids immersed in a polymer blend. We surmise that there is an additional non-osmotic mechanis ...
DOI:
10.1016/j.jcis.2019.12.023

8. Re-evaluating efficiency of first-order numerical schemes for two-layer shallow water systems by considering different eigenvalue solutions

Author:
Krvavica, Nino
Source:
Advances in water resources 2020 v.137 pp. 103508
ISSN:
0309-1708
Subject:
equations,   etc   ; viscosity; water resources;     Show all 3 Subjects
Abstract:
... The efficiency of several first-order numerical schemes for two-layer shallow water equations (SWE) are evaluated here by considering different eigenvalue solutions. This study is a continuation of our previous work (Krvavica et al., 2018) in which we have proposed an efficient implementation of a Roe solver for two-layer SWE based on analytical expressions for eigenvalues and eigenvectors. In thi ...
DOI:
10.1016/j.advwatres.2020.103508

9. A forcing fictitious domain method to simulate fluid-particle interaction of particles with super-quadric shape

Author:
Wu, Mingqiu; Peters, Bernhard; Rosemann, Tony; Kruggel-Emden, Harald
Source:
Powder technology 2020 v.360 pp. 264-277
ISSN:
0032-5910
Subject:
equations,   etc   ; powders; prediction;     Show all 3 Subjects
Abstract:
... Particles of non-spherical shape are always encountered in many real applications. In this work, we develop a new framework to directly simulate super-quadric (SQ) particles in fluid flows based on a forcing fictitious domain method. Specifically, a SQ function is used to represent the particle shape of different types in a flexible manner. Meanwhile, the immersion of particles in the fluid is han ...
DOI:
10.1016/j.powtec.2019.09.088

10. Capillary bridges between spherical particles under suction control: Rupture distances and capillary forces

Author:
Zhao, Chao-Fa; Kruyt, Niels P.; Millet, Olivier
Source:
Powder technology 2020 v.360 pp. 622-634
ISSN:
0032-5910
Subject:
equations,   etc   ; data collection; powders;     Show all 3 Subjects
Abstract:
... This study focuses on properties of axisymmetric capillary bridges between spherical particles in the pendular regime under suction control. Using the toroidal approximation in combination with the governing Young-Laplace equation, analytical expressions for the rupture distance (dependent on the suction) and for the capillary force (dependent on the suction and the interparticle separation distan ...
DOI:
10.1016/j.powtec.2019.09.093

11. Particle-scale characteristics of the three distinct regions in the multi-chamber slot-rectangular spouted bed

Author:
Yang, Shiliang; Wang, Hua; Wei, Yonggang; Hu, Jianhang; Chew, Jia Wei
Source:
Powder technology 2020 v.360 pp. 658-672
ISSN:
0032-5910
Subject:
equations,   etc   ; fluid mechanics; powders;     Show all 3 Subjects
Abstract:
... The particle-scale characteristics of the solid phase in the three distinct regions of the dual-column slot-rectangular spouted bed are studied, along with the effects of operating parameters and scaling up, via the computational fluid dynamics coupled with discrete element method (CFD-DEM). Results demonstrate that: (i) the spout-annulus interface expands from the bottom initially and then shrink ...
DOI:
10.1016/j.powtec.2019.10.038

12. Thermodynamic Analysis and Feedback Stabilization for Irreversible Liquid–Vapor Systems

Author:
Romo-Hernández, Aarón; Hudon, Nicolas; Ydstie, B. Erik; Dochain, Denis
Source:
Industrial & engineering chemistry process design and development 2020 v.59 no.6 pp. 2252-2260
ISSN:
1520-5045
Subject:
equations,   etc   ; mathematical models; thermodynamics;     Show all 3 Subjects
Abstract:
... In this paper, we investigate the stability analysis and the feedback stabilization design problem for multiphase chemical systems using a nonequilibrium thermodynamics formalism. We first present a compartmental model for multiphase systems far from thermodynamic equilibrium. The modeling framework allows us to describe irreversible multiphase systems as a differential-algebraic equation (DAE) sy ...
DOI:
10.1021/acs.iecr.9b04869

13. MIXANDMIX: numerical techniques for the computation of empirical spectral distributions of population mixtures

Author:
Cordero-Grande, Lucilio
Source:
Computational statistics & data analysis 2020 v.141 pp. 1-11
ISSN:
0167-9473
Subject:
equations,   etc   ; mixing; models;     Show all 3 Subjects
Abstract:
... The MIXANDMIX (mixtures by Anderson mixing) tool for the computation of the empirical spectral distribution of random matrices generated by mixtures of populations is described. Within the population mixture model the mapping between the population distributions and the limiting spectral distribution can be obtained by solving a set of systems of non-linear equations, for which an efficient implem ...
DOI:
10.1016/j.csda.2019.06.011

14. Numerical Study of Dam Break Waves on Movable Beds for Complex Terrain by Volume of Fluid Method

Author:
Issakhov, Alibek; Zhandaulet, Yeldos
Source:
Water resources management 2020 v.34 no.2 pp. 463-480
ISSN:
0920-4741
Subject:
equations,   etc   ; algorithms; landscapes; models;     Show all 4 Subjects
Abstract:
... In this study, a method based on the Navier-Stokes equation was developed to simulate the dam break flow. The free surface movement of water is carried out using the Newtonian fluid model, and the mud impurity movement is performed by the model of non-Newtonian fluid based on the volume of fluid (VOF) method. In order to minimize the fluctuations of the free surface near a moving front, the VOF me ...
DOI:
10.1007/s11269-019-02426-1

15. Effects of runner change on the Winter-Kennedy flow measurement method – A numerical study

Author:
Baidar, Binaya; Nicolle, Jonathan; Gandhi, Bhupendra K.; Cervantes, Michel J.
Source:
Renewable energy 2020 v.153 pp. 975-984
ISSN:
0960-1481
Subject:
equations,   etc   ; models; renewable energy sources;     Show all 3 Subjects
Abstract:
... The Winter-Kennedy (WK) method is a popular choice to estimate the relative flow rates, and thus the expected improvement in the efficiency of a low head turbine after its refurbishment. Runner refurbishment is a common way to improve the plant’s efficiency. However, a previous experiment on a model turbine reported deviations between the WK coefficients obtained from two different runners ‒ sugge ...
DOI:
10.1016/j.renene.2020.02.055

16. Universal Scherrer equation for graphene fragments

Author:
Lim, Daniel J.; Marks, Nigel A.; Rowles, Matthew R.
Source:
Carbon 2020 v.162 pp. 475-480
ISSN:
0008-6223
Subject:
equations,   etc   ; geometry; graphene; light scattering;     Show all 4 Subjects
Abstract:
... Graphene fragments spanning a wide range of size and shape were studied computationally using the Debye scattering equation. The calculated diffraction patterns were analysed using the Scherrer equation to infer the fragment size, La. Comparison with the known fragment sizes reveals a strong affine relationship between La and the Scherrer quantity λ/(Bcosθ). To preserve this relationship, we propo ...
DOI:
10.1016/j.carbon.2020.02.064

17. Determining the Mesh Size of Polymer Solutions via the Pore Size Distribution

Author:
Sorichetti, Valerio; Hugouvieux, Virginie; Kob, Walter
Source:
Macromolecules 2020 v.53 no.7 pp. 2568-2581
ISSN:
1520-5835
Subject:
equations,   etc   ; polymers; porosity; porous media;     Show all 4 Subjects
Abstract:
... In order to determine in polymeric systems the geometrical mesh size ξ, we simulate a solution of coarse-grained polymers with densities ranging from the dilute to the concentrated regime and for different chain lengths. We determine the monomer density fluctuation correlation length ξc from the monomer structure factor as well as the radial distribution function, showing that the identification ξ ...
DOI:
10.1021/acs.macromol.9b02166

18. Predicting onset conditions of a free piston Stirling engine

Author:
Zare, Shahryar; Tavakolpour-Saleh, A.R.
Source:
Applied energy 2020 v.262 pp. 114488
ISSN:
0306-2619
Subject:
equations,   etc   ; mathematical models; pistons; prediction;     Show all 4 Subjects
Abstract:
... This research predicts the onset conditions of the free piston Stirling engines using analytical solution of the governing equations and averaging-based Lyapunov technique. In this regard, firstly, the linear dynamic equations of the free piston Stirling engines are extracted. Then, the analytical solutions of the motion equations of the displacer and the power pistons are obtained. Afterwards, th ...
DOI:
10.1016/j.apenergy.2019.114488

19. A scale-up and design basis of continuous tube mills in cement industries

Author:
Nomura, S.
Source:
Powder technology 2020 v.363 pp. 717-734
ISSN:
0032-5910
Subject:
equations,   etc   ; cement; grinding; industry; milling;     Show all 5 Subjects
Abstract:
... Batch grinding kinetics with assumptions is applied to continuous tube milling to describe the grinding performance, relating the degree of size reduction to the milling conditions including the scale-up variables. As to the scale-up effect on the degree of size reduction, the trend predicted is confirmed with that observed in industrial cement mills in reasonable agreement. The equation of the gr ...
DOI:
10.1016/j.powtec.2019.12.052

20. Correction to: Phytase Immobilization on Hydroxyapatite Nanoparticles Improves Its Properties for Use in Animal Feed

Author:
Coutinho, Thamara C.; Tardioli, Paulo W.; Farinas, Cristiane S.
Source:
Applied biochemistry and biotechnology 2020 v.190 no.3 pp. 1124-1125
ISSN:
0273-2289
Subject:
equations,   etc   ; feeds; hydroxyapatite; nanoparticles; phytases;     Show all 5 Subjects
Abstract:
... In the original version of this article, under Calculation of Immobilization Parameters heading, the presentation of the equations are incorrect. The correct presentation of the equations are given below: ...
DOI:
10.1007/s12010-019-03152-5