6 research outputs found
Optimization of Microeconomic Models Under Integrated Partial Differential Equations
No full textObjectives: This study aims to optimize microeconomic models under integrated partial differential equations, focusing on microeconomics and mathematics. Specifically, it examines the optimization of a Microeconomic model in university management, considering the balance between teaching and research activities within departments. Methods/Analysis: The study employs integrated partial differential equations to model the behavior of individuals and firms in a market economy, coupled with microeconomic principles. It analyzes the competitive nature of teaching and research activities within a university department, accounting for resource allocation, suitability of materials, and the challenge of modifying departmental makeup in the short term. Novelty/Improvement: The novelty lies in integrating microeconomic modeling with mathematics, offering a comprehensive approach to university management optimization. By considering the competitive dynamics between teaching and research, as well as the constraints imposed by academic tenure and resource allocation, the model more closely reflects the reality of Higher Education institutions. Findings: The study demonstrates that the proposed model achieves an accuracy of 95% in optimizing resource allocation between teaching and research activities while maintaining quality and adhering to financial constraints. This finding underscores the effectiveness of integrating microeconomic principles with mathematical techniques in addressing complex management challenges within academic institutions. Doi: 10.28991/HIJ-2024-05-04-09 Full Text: PD
An experimental and numerical investigation of coarse aggregate settlement in fresh concrete under vibration
No full textFresh concrete needs vibration to compact, fill the mould and reach a dense state. During the compaction process, coarse aggregates (CAs) tend to settle, affecting the homogeneity and eventually the long-term durability of hardened concrete. In this study, a 3-D, multi-phase numerical model for fresh concrete is developed for better understanding the CA settlement under vibration. The settlement rate of the CA in vibrated concrete is considered based on the Stokes law, and the calibrated rheological parameter of mixtures is determined by the segmented sieving method. The model prediction shows that the vibration time has the greatest effect on CA settlement, followed by the particle size of CAs, whereas the density of CAs and the plastic viscosity of mixtures contribute a little compared with the aforementioned factors. Through experimental tests, the validity of prediction results is well verified. The proposed model provides a new method to understand and estimate the settlement behaviour of CAs.Accepted Author ManuscriptMaterials and Environmen
Thermal Analysis of Cold Storage: The Role of Porous Metal Foam
No full textAbstractWe conduct both analytical and numerical investigations on the solidification behavior of fluid saturated in highly porous open-cell metallic foams. Based on the pore-scaled thermal equilibrium assumption, an analytical extension is made to the classical Neumann's solution to solidifying fluid as an interstitial into metallic foams. To underlying the heat transfer mechanisms for phase change process and the role of inserted foam, an idealized tetrakaidecahedron unit cell geometric model was reconstructed and direct numerical simulations were conducted. Showing good agreement with experimental results and direct numerical simulations, the developed model is verified, favoring the assumption of local thermal equilibrium. The numerical simulation results at pore scale qualitatively demonstrate that: i) the solidification interface is globally flat within a pore; ii) the local natural convection does exist and it contributes to the evolution of solidification interface (9% promotion)
MAOA rs1137070 and heroin addiction interactively alter gray matter volume of the salience network
No full textThe rs1137070 polymorphism of monoamine oxidase A (MAOA) is associated with alcoholism and smoking behavior. However, the association between rs1137070 and heroin addiction remains unclear. In this study, we examined the allelic distribution of rs1137070 in 1,035 heroin abusers and 2,553 healthy controls and investigated the interactive effects of rs1137070 and heroin addiction on gray matter volume (GMV) based on 78 heroin abusers and 79 healthy controls. The C allele frequency of rs1137070 was significantly higher in heroin abusers. Heroin addiction and the rs1137070 variant interactively altered measures of GMV in the anterior cingulate cortex, orbital frontal cortex, temporal pole, and insula, which were correlated with cognitive function. Heroin abusers with the C allele had lower measures of GMV in these regions than the healthy controls with the same allele, whereas those with the T allele displayed a different trend. The altered brain regions were connected with white matter tracts, yielding a structural network that partially overlapped with the salience network. These findings suggest that the low activity-related C allele of MAOA rs1137070 is associated with an increase in the sensitivity to heroin addiction and the damaging effects of heroin abuse on cognition and the salience network.National Basic Research Program of China [2015CB553503, 2011CB707801]; Natural Science Foundation of China [U1402226, 81521063, 81225009, 31571099, 81601165, 81271514, 61473296]; External Cooperation Program of the Chinese Academy of Sciences, National Institutes of Health grants [EB022573, CA189523, MH107703, DA039215, DA039002]SCI(E)ARTICLE
Advanced and Refractory Ceramics for Energy Conservation and Efficiency
No full textThis volume contains a collection of 19 papers from the 11th International Symposium on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE-11), June 14-19, 2015 in Vancouver, BC, Canada. Papers were presented in the below five symposia from Track 2 on the topic of Ceramics for Energy Conservation and Efficiency: / Advanced Ceramics and Composites for Gas Turbine Engines / Advanced Refractory Ceramic Materials and Technologies / Advanced Ceramic Coatings for Power Systems / Energy Efficient Advanced Bearings and Wear Resistant Materials / Advanced Nitrides and Related Materials for Energy Applications /Table of Contents // Preface ix // // ADVANCED CERAMICS AND COMPOSITES FOR GAS TURBINE ENGINES // // Damage of Ceramic Matrix Composites (CMCs) During Machining Operations 3 // R. Goller and A. Rösiger // // CMCS: The Key for Affordable Access to Space 11 // Johannes Petursson and Luis Gonzalez // // Numerical Determination of Effects of Temperature on Infiltration Dynamics of Liquid-Copper and Titanium/Solid-Carbon System 21 // Khurram Iqbal // // Oxidation and High Temperature Resistance of SiC/SiC Composites by NITE-Method 29 // Daisuke Hayasaka, Hirotatsu Kishimoto, Joon-Soo Park, and Akira Kohyama // // High Performance SiC/SiC Component by NITE-Method and Its Application to Energy and Environment 37 // A. Kohyama, D. Hayasaka, H. Kishimoto, and J. S. Park // // Ceramic Matrix Composites: Concurrent Development of Materials and Characterization Tools 53 // G. Ojard, I. Smyth, Y. Gowayed, U. Santhosh, and J. Ahmad // // Fabrication of EBC System with Oxide Eutectic Structure 65 // Shunkichi Ueno, Kyosuke Seya, and Byung-Koog Jang // // ADVANCED REFRACTORY CERAMIC MATERIALS AND TECHNOLOGIES // // The Use of Advanced Ceramic Materials in Oil and Gas Applications 75 // Richard A. Clark and Andrew J. Goshe // // Microstructure and Elastic Properties of Highly Porous Mullite Ceramics Prepared with Wheat Flour 83 // E. Gregorová, W. Pabst, and T. Uhlíová // // The Use of Advanced Refractory Ceramic Materials to Address Industrial Energy Efficiency Challenges 95 // J. G. Hemrick // // An Approach for Modeling Slag Corrosion of Lightweight Al2O3-MgO Castables in Refining Ladle 101 // Ao Huang, Huazhi Gu, Zou Yang, Lvping Fu, Pengfei Lian, and Linwen Jin // // Microstructure, Elastic Properties and High-Temperature Behavior of Silica Refractories 113 // W. Pabst, E. Gregorová, T. Uhlíová, V. Neina, J. Klouzek, and I. Sedláová // // Cement Free Magnesia Based Castables versus Magnesia-Spinel Bricks in Cement Rotary Kilns 125 // Jérôme Soudier // // Evaluation of Reoxidation Tendency of Refractory Materials in Steel Metallurgy by a New Test Method Based on Carrier Gas Hot Extraction 139 // Almuth Sax, Lisa Redecker, Stephan Clasen, Peter Quirmbach, and Christian Dannert // // Ceramic and Metal-Ceramic Components with Graded Microstructure 149 // U. Scheithauer, E. Schwarzer, C. Otto, T. Slawik, T. Moritz, and A. Michaelis // // ENERGY EFFICIENT WEAR RESISTANT MATERIALS // // High Speed Formation of Fine Ceramic Layers by Nanoparticles Filler Rod Thermal Spraying 163 // Soshu Kirihara and Kazuto Takai // // Development of Silicon Nitride Bearing Components by Powder Injection Molding using a Novel Binder System 169 // Zhang Weiru, Zheng Yu, Wang Tengfei, Li Bin1, Zou Jingliang, Wei Zhonghua, Zhang Zhe, Sun Feng, and Pompe Robert // // ADVANCED COATINGS // // Stability of -Alumina Photonic Structures Formed at Low Temperatures Utilizing Chromia-Seeding 179 // Robert M. Pasquarelli, Martin Waleczek, Kornelius Nielsch, Gerold A. Schneider, and Rolf Janssen // // Polymer Derived Glass Ceramic Layers for Corrosion Protection of Metals 187 // Milan Parchovianský, Gilvan Barroso, Ivana Petríková, Gunter Motz, Dagmar Galusková, and Dusan Galusek // // Author Index 201 /
