Opportunity Cost Classification of Goods and Markets by Davor Mance, Nenad Vretenar, Jana Katunar

“… Sixty years ago, Samuelson’s “Pure Theory of Public Expenditure” expounded the classification of goods, and Bain’s “Economies of Scale, Concentration and the Condition of Entry in Twenty Manufacturing Industries” expounded the structure-conduct-performance paradigm. To the present day, rivalry in- and excludability from consumption classify goods, and subadditivity and irreversibility in production classify market structure. …”
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Analysis of the steel industry in Russia by D. G. Saginashvili, V. D. Ryabova, M. I. Zakirova

“…The calculation of the main indicators of the market structure in the form of the Herfindahl-Hirschman formulas and the concentration coefficient for the three largest sellers has been carried out. …”
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Tag-modules with complement submodules H-pure by Surjeet Singh, Mohd Z. Khan

“…The concept of a QTAG-module MR was given by Singh [8]. The structure theory of such modules has been developed on similar lines as that of torsion abelian groups. …”
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An Innovative Way to Generate Hamiltonian Energy of a New Hyperchaotic Complex Nonlinear Model and Its Control by Kholod M. Abualnaja

“…We are implementing a new Rabinovich hyperchaotic structure with complex variables in this research. …”
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Translation and psychometrical properties of Coronavirus Anxiety Scale (CAS) in Peruvian young people and adults by Rulman Andrei Franco-Jimenez

“…Method: The sample was composed of 622 Peruvian young people and adults who answered CAS. The structural evaluation was conducted with confirmatory factor analysis. …”
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Superpotential of three dimensional N $$ \mathcal{N} $$ = 1 heterotic supergravity by Xenia de Ia Ossa, Magdalena Larfors, Matthew Magill, Eirik E. Svanes

“…We confirm that extrema of this functional correspond to supersymmetric heterotic compacti:fications on manifolds of G2 structure in the large volume, weak coupling limit to first order in a'. …”
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Nanostructural theory of metal melts. Foundry production and metallurgy by E. I. Marukovich, V. Yu. Stetsenko

“…In this theory, the main structural elements are not atoms, but nanocrystals. …”
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Exploring how papaya juice improves meat tenderness and digestive characteristics in Wenchang chickens by Zihan Zhang, Yucan Wu, Chunhui Zhang, Feng Huang

“…The objective of this study was to examine the effects of papain in papaya juice on the tenderness, structure and digestive characteristics of chicken meat. …”
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Free-Decay Nonlinear System Identification via Mass-Change Scheme by Dario Anastasio, Stefano Marchesiello

“…Methods for nonlinear system identification of structures generally require input-output measured data to estimate the nonlinear model, as a consequence of the noninvariance of the FRFs in nonlinear systems. …”
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Fare Optimality Analysis of Urban Rail Transit under Various Objective Functions by Lianbo Deng, Zhao Zhang, Kangni Liu, Wenliang Zhou, Junfeng Ma

“…Urban rail transit fare strategies include fare structures and fare levels. We propose a rail transit line fare decision based on an operating plan that falls under elastic demand. …”
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Cournot–Bertrand Duopoly Model: Dynamic Analysis Based on a Computed Cost by S. S. Askar, Ahmed M. Alshamrani

“…Due to unsymmetrical structure of the game’s map, global analysis gives rise to complicated basin of attraction for some attracting sets. …”
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Characterization of TiO2 Nanofilms Obtained by Sol-gel and Anodic Oxidation by María Laura Vera, Miguel Ángel Alterach, Mario Roberto Rosenberger, Diego Germán Lamas, Carlos Enrique Schvezov, Alicia Esther Ares

“…Independently of the technique, thermally-treated films thicker than 30 nm presented different crystalline structures with anatase and rutile phases.…”
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Research on the Supernetwork Equalization Model of Multilayer Attributive Regional Logistics Integration by Jian Xu, Yanna Yin, Xin Wen, Guozhi Lin

“…Based on the multi-level structure attributes of regional logistics, regional logistics integration presents complex features. …”
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Credit Risk Contagion in an Evolving Network Model Integrating Spillover Effects and Behavioral Interventions by Tingqiang Chen, Binqing Xiao, Haifei Liu

“…The model considers the spillover effects of infected investors, behaviors of investors and regulators, emotional disturbance of investors, market noise, and CRT network structure on credit risk contagion. We use theoretical analysis and numerical simulation to describe the influence and active mechanism of the same spillover effects in the CRT market. …”
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Framework of Reference for Chinese Language by T. L. Guruleva

“…The components of the communicative competence of the Chinese language and its level structure are studied. The author has performed a comparative analysis of the component structure and content of the components of the model of the communicative competence of the Chinese language with western, domestic and European models of communicative competence, as well as comparative analysis of the levels of the framework of reference for Chinese language with the levels of the Common European Framework of Reference for Languages. …”
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Optimal control applied to vaccination and treatmentstrategies for various epidemiological models by Holly Gaff, Elsa Schaefer

“…The optimal control simulations suggest that regardless of theparticular epidemiological structure and of the comparative cost ofmitigation strategies, vaccination, if available, would be acrucial piece of any intervention plan.…”
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A Case Study of Analysis of Natural Frequency Variability Related to Manufacturing Process by T. Uhl, W. Lisowski

“…Thus it is very likely that the both considered types of the caliper would possess different properties from the point of view of structural dynamics.…”
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Computation of Vertex-Based Topological Indices of Middle Graph of Alkane CtH2t+2 by Muhammad Shoaib Sardar, Imran Siddique, Fahd Jarad, Muhammad Asad Ali, Erkan Murat Türkan, Muhammad Danish

“…Topological indices are largely applied in chemistry to improve the quantitative structure relationship in which the properties of the molecules can be linked with their chemical structures. …”
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Evaluation of the Impact Resistance of Various Composite Sandwich Beams by Vibration Tests by Amir Shahdin, Joseph Morlier, Laurent Mezeix, Christophe Bouvet, Yves Gourinat

“…This experimental works will help aerospace structural engineer in assess structural integrity using classification of impact resistance of various composite sandwich beams (entangled carbon and glass fibers, honeycomb and foam cores). …”
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Hernia uterine inguinale as an intraoperative diagnosis of male pseudohermaphroditism: case report by Darit A. Molinares-Perez, Hernando Thorné-Velez, Andrés Polanía-Alvarez, David Cerra-Ortegón, Alex Melo, Rafael Arraut

“…During the operative management, structures compatible with the uterus, fallopian tubes, and ovaries were identified in the hernial sac. …”
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