scholarly journals Some aspects of the cosmological dynamics in Einstein–Gauss–Bonnet gravity

2021 ◽  
Vol 36 (13) ◽  
pp. 2150092
Author(s):  
Dmitry Chirkov ◽  
Sergey A. Pavluchenko
Keyword(s):  
Constant Curvature ◽  
Extra Dimensions ◽  
Three Dimensional ◽  
Coupling Constants ◽  
Second Stage ◽  
Isotropic Subspaces ◽  
The One ◽  
Two Stages ◽  
Positively Curved ◽  
Bonnet Term

We study some aspects of dynamical compactification scenario where stabilization of extra dimensions occurs due to the presence of Gauss–Bonnet term and nonzero spatial curvature. In the framework of the model under consideration, there exists two-stages scenario of evolution of a Universe: in the first stage, the space evolves from a totally anisotropic state to the state with three-dimensional (corresponding to our “real” world) expanding and [Formula: see text]-dimensional contracting isotropic subspaces; on the second stage, constant curvature of extra dimensions begins to play role and provide compactification of extra dimensions. It is already known that such a scenario is realizable when constant curvature of extra dimensions is negative. Here we show that a range of coupling constants for which exponential solutions with three-dimensional expanding and [Formula: see text]-dimensional contracting isotropic subspaces are stable is located in a zone where compactification solutions with positively curved extra space are unstable, so that two-stage scenario analogous to the one described above is not realizable. Also we study “nearly-Friedmann” regime for the case of arbitrary constant curvature of extra dimensions and describe new parametrization of the general solution for the model under consideration which provide elegant way of describing areas of existence over parameters space.

Agent-based economic models and econometrics

2012 ◽  
Vol 27 (2) ◽  
pp. 187-219 ◽  
Author(s):  
Shu-Heng Chen ◽  
Chia-Ling Chang ◽  
Ye-Rong Du
Keyword(s):  
Financial Markets ◽  
Agent Based Modeling ◽  
Computational Finance ◽  
Agent Based ◽  
Second Stage ◽  
The Past ◽  
Stage Development ◽  
Three Stages ◽  
The One ◽  
Two Stages

AbstractThis paper reviews the development of agent-based (computational) economics (ACE) from an econometrics viewpoint. The review comprises three stages, characterizing the past, the present, and the future of this development. The first two stages can be interpreted as an attempt to build the econometric foundation of ACE, and, through that, enrich its empirical content. The second stage may then invoke a reverse reflection on the possible agent-based foundation of econometrics. While ACE modeling has been applied to different branches of economics, the one, and probably the only one, which is able to provide evidence of this three-stage development is finance or financial economics. We will, therefore, focus our review only on the literature of agent-based computational finance, or, more specifically, the agent-based modeling of financial markets.

Construcción de un cuestionario para identificar ideas de masculinidad y feminidad en jóvenes de Santiago de Chile. / Construction of a questionnaire to identify ideas of masculinity and femininity among young people in Chile

2017 ◽  
Vol 6 (11) ◽  
pp. 107-131
Author(s):  
Gonzalo Soto Guzmán
Keyword(s):  
Young People ◽  
Focus Groups ◽  
National Level ◽  
Gender Violence ◽  
Avant Garde ◽  
Second Stage ◽  
Masculinity And Femininity ◽  
Santiago De Chile ◽  
The One ◽  
Two Stages

La presente investigación pretende conocer a través de la elaboración de un cuestionario, de qué forma los jóvenes de Chile configuran e integran sus ideas de masculinidad y feminidad; evaluar si las configuraciones de lo que ellos entienden por masculino o femenino posee discursos de tipo tradicionales, hegemónicos o vanguardistas o, por el contrario, evaluar si éstos son posibles de situar en un espacio de transición entre las posturas antes descritas. El estudio contempla dos etapas, la primera (y la que se explica a través de este artículo) es la elaboración de un cuestionario, la segunda alude a aplicar este instrumento a nivel nacional, para obtener resultados que puedan ser vinculados con mayor o menor relación a la violencia de género (la segunda etapa del estudio se encuentra aún en etapa de análisis). La metodología utilizada fue de tipo cualitativa, la técnica de recolección de información fue a través de grupos focales. Se utilizó el software NVIVO versión 11 para analizar categorías en base a los discursos entregados por los jóvenes, los que posteriormente fueron evaluados por jueces expertos y luego piloteado a lo largo del país. The present research aimed at knowing through the creation of a questionnaire how the young people of Chile shape and integrate their ideas of masculinity and femininity, evaluate if their configurations of what they understand by masculine or feminine have traditional type discourses, Hegemonic or avant-garde, or, on the contrary, to evaluate whether these are possible to place in a space of transition between the positions described above. The study contemplates two stages, the first one (and the one that is explained through this article) is the elaboration of a questionnaire, the second alludes to apply this instrument at the national level to obtain results that can be linked with more or less relation with Gender violence; The second stage of the study is still under analysis. The methodology used was of qualitative type. The technique of gathering information was through focus groups. NVIVO version 11 software was used to analyze categories based on discourses delivered by young people, which were subsequently evaluated by expert judges and later piloted throughout the country.

scholarly journals The Balance of Individual and Infrastructure Values in Decisions Regarding Advanced Science and Technology

2019 ◽  
Vol 11 (12) ◽  
pp. 3385 ◽  
Author(s):  
Shunichi Hienuki ◽  
Kazuhiko Noguchi ◽  
Tadahiro Shibutani ◽  
Takahiro Saigo ◽  
Atsumi Miyake
Keyword(s):  
Hierarchical Model ◽  
Technology Policy ◽  
Well Being ◽  
The Other ◽  
Analytic Hierarchy ◽  
Second Stage ◽  
The One ◽  
Two Stages ◽  
Hierarchy Process ◽  
Scientific Technology

A country’s scientific technology policy rarely reflects public opinion. In this study, we created a hierarchical model of societal well-being, comprising five value components for both individual and infrastructure well-being, to analyze the balance among these values. We conducted a survey in two stages; first, both individual and infrastructure well-being were investigated, and then the weights between pairs of value categories composing individual and infrastructure well-being were scored to assess which categories were most important. The analysis of the first stage used the score magnitudes, while that of the second stage used the analytic hierarchy process. The results showed that people value individual well-being more than infrastructure well-being. For both types of well-being, values related to the economy and safety were ranked as more important than the other values, but the weights were distributed over all value components. For individual well-being, the most important value category was the one related to safety, while for infrastructure well-being, it was economy. Therefore, people prioritize different values for themselves and for society as a whole. This suggests that when making decisions regarding technology, it is necessary to understand its effects on all fields and consider the balance between the value categories of well-being.

Optimization of High Pressure Pump Flow Passages Based on Adjoint and CFD

2016 ◽  
Author(s):  
Yumiko Sekino ◽  
Hiroyoshi Watanabe ◽  
Faidon Christakopoulos ◽  
Mehrdad Zangeneh
Keyword(s):  
High Pressure ◽  
Adjoint Method ◽  
Three Dimensional ◽  
High Pressure Pump ◽  
Vaned Diffuser ◽  
Second Stage ◽  
Pressure Pump ◽  
Overall Performance ◽  
Two Stages ◽  
Sensitivity Maps

In order to improve overall performance of a turbomachinery, it is important to reduce losses of stationary flow passages, such as diffusers and return channels, as well as impellers. For multi-stage pumps, to achieve high uniformity of the inlet flow of the latter impeller can prevent degradation of subsequent performance. A two stages high pressure pump which was developed by the authors applied vaned diffuser sections located downstream of the first stage impeller and second stage impeller. The vaned diffusers can be replaced to fit the required specification of operating condition. This design is able to help pumps share the casings so that customers can purchase our products at a low cost. However, the loss of the first stage diffuser section and crossover downstream of the first stage diffuser to the second impeller is large, so that it has a negative impact on overall performance of the pump. It was difficult to reduce loss of the both sections by conventional way such as trial and error approach by modifying geometrical parameters. If we try to reduce the loss of the diffuser section, loss of the crossover passage increases. We therefore applied a technology called Adjoint method to the design optimization of the diffuser and crossover sections of the pump. The adjoint method has recently been put to practical use. By using this method it is possible to obtain a complex three-dimensional shape for realizing an optimum flow field in a very short time while maintaining a high degree of freedom. In this study two objectives were specified in the design optimization of the stationery sections; one is to increase the uniformity of the flow field at the inlet of the second stage impeller and the other is to minimize the loss of the first stage diffuser and crossover passage. In the optimization process, the change of sensitivity of the geometry deformation to the weights of objective functions was analyzed by sensitivity maps. The sensitivity maps show directions of the geometry modification depending on the objectives. The geometry in this design was optimized with 50% - 50% weighting ratio between flow uniformity and pressure loss. The loss of the vaned diffuser and crossover passage, velocity uniformity at the outlet of the crossover passage were verified with Computational Fluid Dynamics (CFD). The improvement of pump stage performance was expected by the optimization. This optimization design procedure applying Adjoint method is effective to improve overall performance of a two stages high pressure pump which has complex three-dimensional flow passages.

scholarly journals Numerical analysis of NOX formation in CO2 diluted biogas premixed combustion

2021 ◽  
pp. 57-64
Author(s):  
Sugeng Hadi Susilo ◽  
Hangga Wicaksono
Keyword(s):  
Mass Fraction ◽  
Numerical Study ◽  
Volume Flow Rate ◽  
Premixed Flame ◽  
Counter Flow ◽  
Nox Formation ◽  
Second Stage ◽  
No2 Reduction ◽  
The One ◽  
Two Stages

A further investigation of premixed biogas combustion towards the NOx formation is presented in this study. The purpose of the simulation is to determine the addition of CO2 in biogas fuel to the combustion behavior of premixed biogas on NOx formation, and to determine the occurrence of NOx in the pre-mixed biogas combustion. In this study, the Counterflow Premixed Flame class is used where this class is based on the One Dim class which is the basis for simulations with a 1-dimensional domain. The Counterflow Premixed Flame class uses an axisymmetric stagnation flow domain which has been written based on the equations. Cantera uses Newton's method to solve them. Completion is carried out in two stages. The first stage is to solve the solution using the equilibrium at each z coordinate point that has been determined. Many estimation starting points are determined from the start of the program. The second stage is the recalculation process at each point and then subdivided to get a smoother solution. The premixed excess CO2 biogas fuel and air combustion analyzed using a 1-dimensional numerical study. The diluted CO2 mass fraction ranged between 0–40 %. The CH4/CO2/air volume flow rate was maintained in ±L/min. The analysis implements the 1-D Counter Flow approach. Two counterflow nozzles were 20mm in diameter and the flame stagnation point at 10 mm. The results show that NOx mass fraction formed only on a fuel-lean mixture of CH4/CO2/air and its values decreased along with CO2 added. The addition of CO2 could reduce the NO species mass fraction down to 18 %, and NO2 reduction down to 7 %. This is mainly caused by a decreasing heat release rate of NO+N↔N2+O, N+O2↔NO+O, N+OH↔NO+H, and N+CO2↔NO+CO reactions. The N+CO2↔NO+CO reaction increased as CO2 was added but its values were not as much as the decline of three other reactions

scholarly journals EVOLUCION DEL CONCEPTO DE SOCIEDAD UNIPERSONAL

2013 ◽  
Vol 8 (1) ◽  
Author(s):  
JULIAN ALBERTO BECERRA GARCIA
Keyword(s):  
Critical Analysis ◽  
Comparative Law ◽  
Current Status ◽  
Constitutional Court ◽  
Legislation And Jurisprudence ◽  
Second Stage ◽  
Member Company ◽  
Palabras Clave ◽  
The One ◽  
Two Stages

<p><strong>Resumen</strong></p><p> </p><p>El presente escrito hace un análisis de la figura de la sociedad unipersonal en dos momentos. En el primer momento, se estudia cómo esta figura ha sido entendida por la doctrina y el derecho comparado. En el segundo momento, se hace una revisión de la evolución y estado actual de la sociedad unipersonal en Colombia, así como un análisis crítico de la normativa y jurisprudencia en torno a la materia.</p><p> </p><p><strong>Palabras clave</strong></p><p> </p><p>Sociedad Unipersonal, Derecho Comparado, Legislación colombiana, Corte Constitucional.</p><p> </p><p> </p><p><strong>EVOLUTION</strong><strong> </strong><strong>OF THE CONCEPT OF</strong><strong> </strong><strong>SINGLE MEMBER COMPANY</strong><strong> </strong></p><p> </p><p><strong>Abstract </strong></p><p> </p><p>The present paper provides an analysis of the figure of the one- person society two stages. At first, we study how this figure has been understood by the doctrine and comparative law. In the second stage, we review the evolution and current status of the member company in Colombia and a critical analysis of the legislation and jurisprudence on the matter.</p><p> </p><p><strong>Key Words</strong></p><p> </p><p>One- person society, Comparative Law, Legislation Colombian Constitutional Court.</p><p> </p><p><strong>Evolução do conceito</strong><strong> de sociedade unipessoal</strong></p><p><br /> <strong>Resumo</strong><br /> <br /> O presente documento é uma análise da forma do unipessoal em duas fases. Em primeiro lugar, nós estudamos como essa figura tem sido entendido pela doutrina e do direito comparado. No segundo momento, é uma revisão da evolução e da situação atual da empresa membro na Colômbia, bem como uma análise crítica da lei e da jurisprudência sobre o assunto.</p><p><br /> Palavras-chave: Sociedade Sole, Direito Comparado, Legislação Corte Constitucional colombiana.</p><p> </p>

scholarly journals Center mass theorem in three dimensional spaces with constant curvature

2020 ◽  
Vol 56 (3) ◽  
pp. 328-334
Author(s):  
Yu. A. Kurochkin ◽  
D. V. Shoukavy ◽  
I. P. Boyarina
Keyword(s):  
Constant Curvature ◽  
Jacobi Equation ◽  
Center Of Mass ◽  
Three Dimensional ◽  
The Other ◽  
Dimensional Sphere ◽  
Internal Interaction ◽  
The One ◽  
Definition Of ◽  
Hamilton Jacobi Equation

In this paper, based on the definition of the center of mass given in [1, 2], its immobility is postulated in spaces with a constant curvature, and the problem of two particles with an internal interaction, described by a potential depending on the distance between points on a three-dimensional sphere, is considered. This approach, justified by the absence of a principle similar to the Galileo principle on the one hand and the property of isotropy of space on the other, allows us to consider the problem in the map system for the center of mass. It automatically ensures dependence only on the relative variables of the considered points. The Hamilton – Jacobi equation of the problem is formulated, its solutions and the equations of trajectories are found. It is shown that the reduced mass of the system depends on the relative distance. Given this circumstance, a modified system metric is written out.

Altered Fine Structure of B Lymphocytes Correlated with Defective Terminal Differentiation

1973 ◽  
Vol 31 ◽  
pp. 386-387
Author(s):  
Dale E. Bockman ◽  
L. Y. Frank Wu ◽  
Alexander R. Lawton ◽  
Max D. Cooper
Keyword(s):  
Immune Deficiency ◽  
B Lymphocytes ◽  
Plasma Cells ◽  
Present Report ◽  
Specific Antigen ◽  
Terminal Differentiation ◽  
Second Stage ◽  
Two Stages ◽  
Deficiency Diseases ◽  
Cell Line Generation

B-lymphocytes normally synthesize small amounts of immunoglobulin, some of which is incorporated into the cell membrane where it serves as receptor of antigen. These cells, on contact with specific antigen, proliferate and differentiate to plasma cells which synthesize and secrete large quantities of immunoglobulin. The two stages of differentiation of this cell line (generation of B-lymphocytes and antigen-driven maturation to plasma cells) are clearly separable during ontogeny and in some immune deficiency diseases. The present report describes morphologic aberrations of B-lymphocytes in two diseases in which second stage differentiation is defective.

Diffraction contrast of dislocations in icosahedral quasicrystals

1990 ◽  
Vol 48 (4) ◽  
pp. 454-455
Author(s):  
K. Urban ◽  
Z. Zhang ◽  
M. Wollgarten ◽  
D. Gratias
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Complete Characterization ◽  
Extinction Condition ◽  
Burgers Vector ◽  
Diffraction Contrast ◽  
Lattice Geometry ◽  
Reference Space ◽  
Icosahedral Quasicrystals ◽  
The One

Recently dislocations have been observed by electron microscopy in the icosahedral quasicrystalline (IQ) phase of Al65Cu20Fe15. These dislocations exhibit diffraction contrast similar to that known for dislocations in conventional crystals. The contrast becomes extinct for certain diffraction vectors g. In the following the basis of electron diffraction contrast of dislocations in the IQ phase is described. Taking account of the six-dimensional nature of the Burgers vector a “strong” and a “weak” extinction condition are found.Dislocations in quasicrystals canot be described on the basis of simple shear or insertion of a lattice plane only. In order to achieve a complete characterization of these dislocations it is advantageous to make use of the one to one correspondence of the lattice geometry in our three-dimensional space (R3) and that in the six-dimensional reference space (R6) where full periodicity is recovered . Therefore the contrast extinction condition has to be written as gpbp + gobo = 0 (1). The diffraction vector g and the Burgers vector b decompose into two vectors gp, bp and go, bo in, respectively, the physical and the orthogonal three-dimensional sub-spaces of R6.

Exploring the Multidimensional Facets of Authoritarianism: Authoritarian Aggression and Social Dominance Orientation

2008 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Stefano Passini
Keyword(s):  
Social Dominance ◽  
Factor Model ◽  
Three Dimensional ◽  
Social Dominance Orientation ◽  
Model Fit ◽  
Regression Analyses ◽  
One Dimensional ◽  
Confirmatory Factor ◽  
The One ◽  
Better Than

The relation between authoritarianism and social dominance orientation was analyzed, with authoritarianism measured using a three-dimensional scale. The implicit multidimensional structure (authoritarian submission, conventionalism, authoritarian aggression) of Altemeyer’s (1981, 1988) conceptualization of authoritarianism is inconsistent with its one-dimensional methodological operationalization. The dimensionality of authoritarianism was investigated using confirmatory factor analysis in a sample of 713 university students. As hypothesized, the three-factor model fit the data significantly better than the one-factor model. Regression analyses revealed that only authoritarian aggression was related to social dominance orientation. That is, only intolerance of deviance was related to high social dominance, whereas submissiveness was not.

Sign in / Sign up

Export Citation Format

Share Document