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Journal articles on the topic 'Frenet invariants'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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1

Yılmaz, Süha, and Yasin Unluturk. "On spherical indicatrices of curves in Galilean 4-space G₄." Journal of the Indonesian Mathematical Society 25, no. 2 (2019): 154–70. http://dx.doi.org/10.22342/jims.25.2.473.154-170.

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In this study, we indroduce spherical indicatrices of curves in four dimensional Galilean space. Moreover, we characterize these curves in terms of Frenet-Serret vector fields in four dimensional Galilean space. Frenet-Serret apparatus of these curves are obtained in terms of base curve's Frenet invariants. Additionally, some theorems are given regarding characterizations of spherical indicatrices of curves in four dimensional Galilean space.
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2

Önder, Mehmet, and H. Hüseyin Uğurlu. "Frenet frames and invariants of timelike ruled surfaces." Ain Shams Engineering Journal 4, no. 3 (2013): 507–13. http://dx.doi.org/10.1016/j.asej.2012.10.003.

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3

SİVAS, Selin, Süleyman ŞENYURT, and Abdussamet ÇALIŞKAN. "Smarandache Curves of Involute-Evolute Curve According to Frenet Frame." Fundamentals of Contemporary Mathematical Sciences 4, no. 1 (2023): 31–45. http://dx.doi.org/10.54974/fcmathsci.1152564.

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4

ŞENYURT, Süleyman, Kebire Hilal AYVACI, and Davut CANLI. "Smarandache Curves According to Flc-frame in Euclidean 3-space." Fundamentals of Contemporary Mathematical Sciences 4, no. 1 (2023): 16–30. http://dx.doi.org/10.54974/fcmathsci.1142404.

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The paper investigates some special Smarandache curves according to Flc-frame in Euclidean 3-space. The Frenet and Flc frame vectors, curvature and torsion of the new constructed curves are expressed by means of the initial curve invariants. For the sake of comparison in view, an example for Smarandache curves according to both Frenet and Flc frame is also presented at the end of paper.
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5

KAMRAN, NIKY, PETER OLVER, and KETI TENENBLAT. "LOCAL SYMPLECTIC INVARIANTS FOR CURVES." Communications in Contemporary Mathematics 11, no. 02 (2009): 165–83. http://dx.doi.org/10.1142/s0219199709003326.

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We consider curves in ℝ2n endowed with the standard symplectic structure. We introduce the concept of symplectic arc length for curves. We construct an adapted symplectic Frenet frame and we define 2n - 1 local differential invariants that we call symplectic curvatures of the curve. We prove that up to a rigid symplectic motion of ℝ2n, there exists a unique curve with prescribed symplectic curvatures. We characterize the curves in ℝ4 with constant symplectic curvatures.
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6

Ali, Ahmad. "Special Smarandache Curves in the Euclidean Space." International J.Math. Combin. Vol.2 (May 3, 2010): 30–36. https://doi.org/10.5281/zenodo.9392.

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7

Zhao, Qiming, Lin Yang, and Yongqiao Wang. "Geometry of Developable Surfaces of Frenet Type Framed Base Curves from the Singularity Theory Viewpoint." Symmetry 14, no. 5 (2022): 975. http://dx.doi.org/10.3390/sym14050975.

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In this paper, we consider Frenet type framed base curves that may have singular points and define one-parameter developable surfaces associated with such curves. By using the singularity theory, we classify the generic singularities of the developable surfaces, which are cuspidal edges and swallowtails. In order to characterize these singularities, two geometric invariants are discovered. At last, an example is given to demonstrate the main results.
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8

Şenyurt, Süleyman, and Abdussamet Çalışkan. "The quaternionic expression of ruled surfaces." Filomat 32, no. 16 (2018): 5753–66. http://dx.doi.org/10.2298/fil1816753s.

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In this paper, firstly, the ruled surface is expressed as a spatial quaternionic. Also, the spatial quaternionic definitions of the Striction curve, the distribution parameter, angle of pitch and the pitch are given. Finally, integral invariants of the closed spatial quaternionic ruled surfaces drawn by the motion of the Frenet vectors {t,n1,n2} belonging to the spatial quaternionic curve ? are calculated.
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Dinkova, Cvetelina, Radostina Encheva, and Aynur Ali. "One parametric representation of the generalized focal curve of a non-helical spherical curve." Mathematics and Education in Mathematics 54 (March 27, 2025): 039–45. https://doi.org/10.55630/mem.2025.54.039-045.

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In this paper, we establish relations between Frenet frames and differential-geometric invariants of a non-helical space curve in a three-dimensional Euclidean space and its closely related curve in a four-dimensional Euclidean space. The focal curve of the constructed four-dimensional curve is used to obtain a parametric representation of the generalized focal curve of a spherical curve.
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10

İşbilir, Zehra, Bahar Doğan Yazıcı, and Murat Tosun. "Generalized Rectifying Ruled Surfaces of Special Singular Curves." Analele Universitatii "Ovidius" Constanta - Seria Matematica 31, no. 3 (2023): 177–206. https://doi.org/10.2478/auom-2023-0038.

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Abstract In this study, generalized rectifying ruled surfaces of Frenet-type framed base curves in the three-dimensional Euclidean space are introduced. These surfaces are a generalization of not only the tangent and binormal surfaces of Frenet-type framed base curves, but also the tangent and binormal surfaces of regular curves. Additionally, we present some geometric characterizations and properties of these surfaces. Then, the singular point classes of the surface are scrutinized and the conditions for being a cross-cap surface are stated. Moreover, generalized rectifying surfaces are exami
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11

Mustafa, BİLİCİ. "On the invariants of ruled surfaces generated by the dual involute frenet trihedron." Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics 66, no. 2 (2017): 62–70. http://dx.doi.org/10.1501/commua1_0000000801.

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12

Solouma, E. M., M. M. Wageeda, M. A. Soliman, and M. Bary. "Geometric Properties of Special Spacelike Curves in Three-Dimension Minkowski Space-Time." Modern Applied Science 14, no. 2 (2020): 11. http://dx.doi.org/10.5539/mas.v14n2p11.

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In this paper, we introduce a special spacelike Smarandache curves  reference to the Bishop frame of a regular spacelike curve  in Minkowski 3-space . From that point, we investigate the Frenet invariants of a special case in  and we obtain some properties of these curves when the base curve  is contained in a plane. Lastly, we shall give two examples to illustrate these curves.
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13

Orbay, Keziban, and Tevfik Sahin. "Mannheim offsets of ruled surfaces under the 1-parameter motions." Boletim da Sociedade Paranaense de Matemática 40 (February 4, 2022): 1–9. http://dx.doi.org/10.5269/bspm.50973.

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In this study, the situation of Mannheim offsets of ruled surfaces under the 1-parameter motions is investigated. Firstly, relationships between geodesic Frenet trihedrons of Mannheim offsets of ruled surfaces are obtained and the relationship between the curvatures of the surface pairs is examined. Also, change of integral invariants the surface pairs under the 1-parameter motions is studied. Finally, the relevant example is given for every Mannheim offsets of ruled surfaces.
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14

ALTINKAYA, Anıl, and Mustafa ÇALIŞKAN. "B-Lift curves and its ruled surfaces." Communications Faculty Of Science University of Ankara Series A1Mathematics and Statistics 72, no. 1 (2023): 159–68. http://dx.doi.org/10.31801/cfsuasmas.1074682.

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In this paper, we have described the B-Lift curve in Euclidean space as a curve obtained by combining the endpoints of the binormal vector of a unit speed curve. Subsequently, we have explored the Frenet frames of the B-Lift curves. Moreover, we have introduced the tangent, normal and binormal surfaces of the B-Lift curve and examined the geometric invariants of these surfaces. Finally, we have investigated the singularities of these surface and visualized the surfaces with MATLAB program.
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15

Solouma, Emad, Sayed Saber, and Haci Mehmet Baskonus. "Exploring Harmonic Evolute Geometries Derived from Tubular Surfaces in Minkowski 3-Space Using the RM Darboux Frame." Mathematics 13, no. 15 (2025): 2329. https://doi.org/10.3390/math13152329.

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In this study, We explore for Minkowski 3-space E13 harmonic surfaces’ geometric features by employing a common tangent vector field along a curve situated on the surface. Our analysis is grounded in the rotation minimizing (RM) Darboux frame, which offers a robust alternative to the classical Frenet frame particularly valuable in the Lorentzian setting, where singularities frequently arise. The RM Darboux frame, tailored to curves lying on surfaces, enables the expression of fundamental invariants such as geodesic curvature, normal curvature, and geodesic torsion. We derive specific condition
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16

CĂLIN, CONSTANTIN, and MIRCEA CRASMAREANU. "SLANT CURVES AND PARTICLES IN THREE-DIMENSIONAL WARPED PRODUCTS AND THEIR LANCRET INVARIANTS." Bulletin of the Australian Mathematical Society 88, no. 1 (2012): 128–42. http://dx.doi.org/10.1017/s0004972712000809.

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AbstractSlant curves are introduced in three-dimensional warped products with Euclidean factors. These curves are characterised by the scalar product between the normal at the curve and the vertical vector field, and an important feature is that the case of constant Frenet curvatures implies a proper mean curvature vector field. A Lancret invariant is obtained and the Legendre curves are analysed as a particular case. An example of a slant curve is given for the exponential warping function; our example illustrates a proper (that is, not reducible to the two-dimensional) case of the Lancret th
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17

Doğan Yazıcı, Bahar, and Murat Tosun. "Quasi-type frame and quasi-type osculating curves in Myller configuration." Filomat 38, no. 8 (2024): 2813–20. https://doi.org/10.2298/fil2408813d.

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In this article, we introduce a quasi-type frame and quasi-type osculating curves in Myller configuration. First, we obtain a quasi-type frame by using Frenet-type frame in Myller configuration. Then, we introduce quasi-type osculating curves. We obtain some relations for a curve to be a quasi-type osculating curve relative to the quasi-type frame in the Myller configuration. Then, we examine the relationships between the curvatures and invariants of the quasi-type osculating curves. Finally, we give some classifications according to the special cases of quasi curvatures. We shown that these c
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18

Perrot, Denis. "Secondary invariants for Frechet algebras and quasihomomorphisms." Documenta Mathematica 13 (2008): 275–363. http://dx.doi.org/10.4171/dm/249.

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19

Shaikh, Absos, Kuljeet Singh, and Sandeep Sharma. "Invariant nature of Darboux normal curves on a smooth surface under isometry." Filomat 38, no. 29 (2024): 10485–94. https://doi.org/10.2298/fil2429485s.

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In this article, we explore the relationships between the Darboux frame and the Frenet frame by investigating the invariant sufficient conditions for the isometric image of a Darboux normal curve when using the Darboux frame instead of the Frenet frame. Additionally, we analyze the deviation in the component of the position vector of a Darboux normal curve on a smooth surface in relation to the provided isometry. The results of this study contribute to the improvement and generalization of certain earlier findings in the literature.
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20

Gün Bozok, Hülya, Sezin Aykurt Sepet, and Mahmut Ergüt. "Motions of Curves in 4-Dimensional Galilean Space G4." Asian-European Journal of Mathematics 14, no. 09 (2021): 2150153. http://dx.doi.org/10.1142/s1793557121501539.

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In this paper, we investigate the flow of curve and its equiform geometry in 4-dimensional Galilean space. We obtain that the Frenet equations and curvatures of inextensible flows of curves and its equiformly invariant vector fields and intrinsic quantities are independent of time. We find that the motions of curves and its equiform geometry can be defined by the inviscid and stochastic Burgers’ equations in 4-dimensional Galilean space.
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21

Gouveia, Valdiney Veloso, Renan Pereira Monteiro, Bruna da Silva Nascimento, Tátila Rayane de Sampaio Brito, Alessandro Teixeira Rezende, and Maria Gabriela Costa Ribeiro. "Propriedades Psicométricas da Escala de Intenções Frente à Infidelidade (EII)." Psico-USF 23, no. 2 (2018): 295–305. http://dx.doi.org/10.1590/1413-82712018230209.

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Resumo O presente estudo objetivou adaptar ao contexto brasileiro a Escala de Intenções frente à Infidelidade (EII), conhecendo seus parâmetros psicométricos. Realizou-se dois estudos com pessoas que indicaram estar em um relacionamento amoroso. No Estudo 1 participaram 161 pessoas (idade média = 24,9), que responderam a EII e perguntas demográficas. Os resultados indicaram a unifatorialidade desta escala (α = 0,85), cujos itens mostraram-se discriminativos (amplitude do theta variou de -0,5 a 3,0). No Estudo 2 participaram 236 pessoas (média de idade = 25,5), que responderam os mesmos instrum
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22

Cepas González, Rebeca, Paula Ruiz-Zorrilla Blanco, Francisco Gil, and Mirko Antino. "Development and Validation of the Spanish Version of the Political Skill Inventory: A Measurement Invariance Test." Anales de Psicología 36, no. 2 (2020): 370–77. http://dx.doi.org/10.6018/analesps.368871.

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Introducción: El inventario de habilidades políticas (PSI, siglas en inglés) es una medida para calibrar cuatro dimensiones relacionadas con este constructo: la astucia social, la capacidad de influencia interpersonal, la habilidad para establecer contactos y la sinceridad aparente (Ferris, 2005).
 Método: En el presente estudio, multi-muestra y multi-método, sendos análisis factorial exploratorio y confirmatorio se han llevado a cabo para desarrollar y testar las propiedades psicométricas de la versión española del PSI. Adicionalmente, se llevó a cabo un test de fiabilidad longitudinal y
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23

Samad, Manar D., and Khan M. Iftekharuddin. "Frenet Frame-Based Generalized Space Curve Representation for Pose-Invariant Classification and Recognition of 3-D Face." IEEE Transactions on Human-Machine Systems 46, no. 4 (2016): 522–33. http://dx.doi.org/10.1109/thms.2016.2515602.

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24

CAETANO, CLÁUDIA APARECIDA, and ANA MARIA ESTEVES BORTOLANZA. "PEDAGOGIA FREINET: EDUCAR A CRIANÇA PARA A VIDA E PELA VIDA NA EDUCAÇÃO INFANTIL." Teoria e Prática da Educação 21, no. 1 (2018): 29–41. http://dx.doi.org/10.4025/tpe.v21i1.41130.

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Ao idealizar uma escola para o povo e reunir suas experiências didáticas num sistema que chamou de Escola Moderna, Freinet modernizou e democratizou o ensino. O artigo aborda a Pedagogia Freinet, a vida e a obra de Célestin Freinet, criador das técnicas para educar crianças para a vida e pela vida. Pesquisa bibliográfica (2017), cuja finalidade é apontar as implicações pedagógicas de seus estudos, ao abordar os Princípios Invariantes, articulando teoria e prática, a partir dos pressupostos básicos: Tateamento ou Tentativa Experimental; Educação do Trabalho; Cooperação Comunicação e Livre Expre
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25

Wang, Chunxiao, Qingxin Zhou, and Zhigang Wang. "Geometrical particles and Legendrian dualities related to null curves." International Journal of Modern Physics A 35, no. 09 (2020): 2050051. http://dx.doi.org/10.1142/s0217751x20500517.

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In this paper, we investigate the special properties of geometrical particles with null paths in de Sitter 3-space–time, new Frenet equations and an important invariant associated with null paths are presented. By means of unfolding theory, the local topological structure of the lightlike dual surfaces is revealed. It is found that the lightlike dual surface has some singularities whose types can be determined by the invariant. Based on the theory of Legendrian dualities on pseudospheres and the theory of contact manifolds, it is shown that there exists the [Formula: see text]-dual relationshi
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S.I., Vyatkin, and Dolgovesov B.S. "THE METHOD OF DEFORMATION OF THREE-DIMENSIONAL OBJECTS BASED ON FREE-FORM PATCHES." ИННОВАЦИОННЫЕ НАУЧНЫЕ ИССЛЕДОВАНИЯ 2022. 6-2(20) (September 19, 2022): 51–73. https://doi.org/10.5281/zenodo.7093690.

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The paper presents an analytical method of isotropic deformations of three-dimensional objects based on free-form patches. The proposed method is characterized by a compact description of objects. The approach uses invariants of the stretching tensor. The polar decomposition of the strain gradient is used. The paper describes a mathematical process performed in a finite number of operations for eigenvalue systems of invariants. Invariants are used to obtain proper systems of isotropic energy.
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27

Boyer, Catherine, and Maria Pagoni. "Interroger l’organisation de l’activité des enseignants en recherche documentaire dans le cadre de la Pédagogie Freinet." Travail et Apprentissages N° 25, no. 1 (2024): 139–61. http://dx.doi.org/10.3917/ta.025.0139.

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Cet article interroge la mise en place d’un dispositif innovant, la Recherche Documentaire (RD), en cycle 3, par un collectif de trois enseignants en pédagogie Freinet. Le croisement entre didactique professionnelle et didactique des disciplines permet de questionner à la fois les savoirs visés par ce dispositif du point de vue disciplinaire et les effets du travail collectif d’analyse des pratiques mis en place par les chercheurs via l’auto-confrontation croisée sur la formation des enseignants. La théorie des champs conceptuels et plus particulièrement la notion de l’organisation de l’activi
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28

Pellistrandi, Benoît. "De la «acción de los católicos» a la santidad laical. El historiador frente a la santidad contemporánea." Anuario de Historia de la Iglesia 13 (May 2, 2018): 105–27. http://dx.doi.org/10.15581/007.13.23627.

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El así dicho fracaso de la presencia de los católicos en bastantes campos de la vida política y social, implican preguntarse cómo definir la santidad en nuestra época. El historiador debe ceder la palabra al teólogo, cuando se analiza la invariante de la santidad en la historia. Por el contrario, si se analizan los modelos de santidad, el historiador puede ofrecer una explicación de esas elecciones, así como de su cronología. Aquí, en la estrategia de las canonizaciones, podía esperarse algún cambio, después del Vaticano II. Sin embargo, esa reacción no se ha producido.
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29

Eftekharinasab, Kaveh. "Some applications of transversality for infinite dimensional manifolds." Proceedings of the International Geometry Center 14, no. 2 (2021): 137–53. http://dx.doi.org/10.15673/tmgc.v14i2.1939.

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We present some transversality results for a category of Frechet manifolds, the so-called MCk - Frechet manifolds. In this context, we apply the obtained transversality results to construct the degree of nonlinear Fredholm mappings by virtue of which we prove a rank theorem, an invariance of domain theorem and a Bursuk-Ulam type theorem.
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Herrera López, Adriana Carolina, Leny Yohana Villa Hurtado, and Gloria María Cardona Castaño. "INVARIANTES OPERATORIOS QUE ACTIVA UN ESTUDIANTE DEL GRADO QUINTO DE BÁSICA PRIMARIA, A TRAVÉS DE UNA SECUENCIA DE SITUACIONES EXPERIMENTALES ORIENTADAS EN LA TEORÍA DE LOS CAMPOS CONCEPTUALES." Revista Bio-grafía Escritos sobre la biología y su enseñanza 10, no. 19 (2017): 1017. http://dx.doi.org/10.17227/bio-grafia.extra2017-7268.

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Este artículo es producto del Trabajo de Grado para optar al título de Licenciado en educación básica con énfasis en ciencias naturales y Educación ambiental Facultad de Educación, Universidad de Antioquia, Medellín. En este se analiza la presencia de los invariantes operatorios de un grupo de estudiantes durante la solución de una secuencia de situaciones experimentales orientadas en la Teoría de los Campos Conceptuales de Gerard Vergnaud. Para ello se llevan a cabo prácticas de laboratorio con los estudiantes del grado quinto de Básica Primaria de una Institución Educativa oficial del munici
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31

Ye, Jin Hua, Di Li, Shi Yong Wang, and Feng Ye. "Robust Guidance Control for Nonholonomic AGV Based on First Order Dynamic Sliding Mode Techniques." Advanced Materials Research 709 (June 2013): 583–88. http://dx.doi.org/10.4028/www.scientific.net/amr.709.583.

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This paper develops a high performance guidance controller for automated guided vehicle (AGV) with nonholonomic constraint. In this controller, the path following method in the Serret-Frenet frame is used for driving the AGV onto a predefined path at a constant forward speed. Moreover, a first order dynamic sliding mode controller is proposed, not only to overcome the impact of unknown model uncertainties and external disturbances of the system, but also to weaken the chattering in the standard sliding mode control. The global asymptotic stability and robustness of the system is proven by the
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32

CERDÁN, Marcos S., Ricardo J. DI MASSO, and María Alejandra LAPALMA. "Evaluación del aprendizaje del tema componentes invariantes del dato científico en la asignatura metodología de la investigación." FAVE Sección Ciencias Veterinarias 20, no. 1 (2021): 22–25. http://dx.doi.org/10.14409/favecv.v20i1.10123.

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Se evaluó el aprendizaje del tema componentes invariantes del dato científico en el examen final de estudiantes que rindieron la asignatura Metodología de la investigación en la carrera de Medicina Veterinaria de la Universidad Nacional de Rosario. Se utilizó un instrumento especialmente diseñado, conformado por un enunciado consistente en un texto que incluye los elementos vinculados con cada uno de los componentes invariantes del dato científico (entidad, propiedad, estado y procedimiento), una consigna de trabajo y una tabla para completar por parte del estudiante como respuesta. De los 57
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Rosas-Santiago, Francisco Javier, Emmeline Lagunes-Córdoba, Nora Edith Prieto-Robles, María Amanda Julieta Tello-Bello, and Roberto Lagunes-Córdoba. "Validación de una escala de afrontamiento en el contexto de la pandemia por SARS-CoV2." SANUS 8 (December 28, 2023): e387. http://dx.doi.org/10.36789/revsanus.vi1.387.

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Introducción: El afrontamiento es un constructo psicológico relevante en situaciones en las que existe un peligro continuado, tal como ocurre en el contexto de la pandemia por SARS-CoV2 en México y el mundo. Objetivo: Adaptar y validar una escala para medir el afrontamiento frente al riesgo de infección en una muestra de adultos mexicanos durante el confinamiento por la pandemia por la SARS-CoV2. Metodología: estudio de tipo instrumental, en una muestra no probabilística de 1132 participantes mexicanos, mayores de 18 años que aceptaran participar por medio de una encuesta en línea previo conse
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Vega-Dienstmaier, Johann Martín, July Caballero-Peralta, G. Magaly Ascate-K’ana, and Mariela Tavera-Palomino. "Validation of the self-applicable version of the Resilience Subscale of the BESSI-45 Inventory in Peruvian adolescents aged 12 to 17 years." Revista de Neuro-Psiquiatría 87, no. 1 (2024): 18–31. http://dx.doi.org/10.20453/rnp.v87i1.5046.

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Introducción: Las habilidades de resiliencia emocional implican la regulación del estrés, la ansiedad, el miedo, la cólera y la irritabilidad; resistirse intencionalmente a los impulsos; y mantener una actitud positiva frente a circunstancias difíciles y hacia uno mismo. El objetivo de este estudio es evaluar las propiedades psicométricas de una versión en español de la subescala de resiliencia del BESSI-45. Método: Se aplicó el BESSI-45 a 625 adolescentes de 3 zonas diferentes del Perú. La subescala de resiliencia fue evaluada en cuanto a sus baremos, consistencia interna, estructura factoria
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Pardo, Pedro Javier. "El Quijote architextual: poética del mito quijotesco." Anales Cervantinos 56 (December 30, 2024): 578. https://doi.org/10.3989/anacervantinos.2024.578.

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Este trabajo ofrece una teorización del mito de don Quijote ilustrada mediante un corpus de veinticinco obras escritas en cuatro lenguas diferentes (español, inglés, francés y alemán). La introducción detalla los obstáculos para el estudio de don Quijote como mito, en particular las objeciones de la mitocrítica francesa a considerarlo como tal, y plantea su superación a través del concepto de ‘architexto’. A continuación, se procede a la descomposición del mito quijotesco en sus unidades constitutivas (mitemas y motivos), a las que añade otras tres categorías (regímenes, tipos y grados), a tra
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36

Medina-Bárcenas, M., D. Keskin Tütüncü, and Y. Kuratomi. "A study on dual square free modules." Algebra and Discrete Mathematics 32, no. 2 (2021): 267–79. http://dx.doi.org/10.12958/adm1512.

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Let M be an H-supplemented coatomic module with FIEP. Then we prove that M is dual square free if and only if every maximal submodule of Mis fully invariant. Let M=Li∈I Mi be a direct sum, such that M is coatomic. Then we prove that M is dual square free if and only if each Mi is dual square free for all i ∈ I and, Mi and Lj=iMj are dual orthogonal. Finally we study the endomorphism rings of dual square free modules. Let M be a quasi-projective module. If End R(M) is right dual square free, then M is dual square free. In addition, if M is finitely generated, then End R(M) is right dual square
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37

Molgado, Alberto, and Efraín Rojas. "Hamiltonian dynamics of gonihedric string theory." International Journal of Modern Physics A 36, no. 05 (2021): 2150035. http://dx.doi.org/10.1142/s0217751x21500354.

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We develop in a consistent manner the Ostrogradski–Hamilton framework for gonihedric string theory. The local action describing this model, being invariant under reparametrizations, depends on the modulus of the mean extrinsic curvature of the worldsheet swept out by the string, and thus we are confronted with a genuine second-order in derivatives field theory. In our geometric approach, we consider the embedding functions as the field variables and, even though the highly nonlinear dependence of the action on these variables, we are able to complete the classical analysis of the emerging cons
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38

Brzeska, A. "Density and capacity of balleans generated by filters." Ukrains’kyi Matematychnyi Zhurnal 73, no. 4 (2021): 467–73. http://dx.doi.org/10.37863/umzh.v73i4.648.

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UDC 519.51 We consider a ballean with an infinite support and a free filter on and define for every and The ballean will be called the <em>ballean-filter mix</em> of and and denoted by It was introduced in [O. V. Petrenko, I. V. Protasov, <em>Balleans and filters</em>, Mat. Stud., <strong>38</strong>, No. 1, 3–11 (2012)] and was used to construction of a non-metrizable Frechet group ballean. In this paper some cardinal invariants are compared. In particular, we give a partial answer to the question: if we mix an ordinal unbounded ballean with a free filter o
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39

Méndez, Patricia. "CONVENCIONES PERSISTENTES EN LA FOTOGRAFÍA DE ARQUITECTURA DEL SIGLO XX." Materia Arquitectura, no. 19 (April 29, 2021): 54. http://dx.doi.org/10.56255/ma.v0i19.426.

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Fotografía y arquitectura guardan entre sí una relación unívoca y constante. El invento y la tecnología de la primera resultaron ser mecanismos óptimos para la divulgación de la segunda, transformándola en modelo ideal frente al gatillo de una cámara. Sin embargo, esas evidencias, plasmadas en papel, revelan también la instalación de un campo disciplinar que amarró los cánones visuales y estéticos de ambas disciplinas. Este texto se propone entonces indagar este binomio a partir de las invariantes que circunscribieron la foto- grafía de arquitectura del siglo XX. La metodología
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40

Morales-Castillo, Miguel. "Afrontamiento adolescente en el contexto académico: adaptación de una medida multidimensional." Revista Electrónica de Investigación Educativa 24 (December 9, 2022): 1–15. http://dx.doi.org/10.24320/redie.2022.24.e26.4180.

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El presente estudio analiza una adaptación de las formas de lidiar con fuentes de tensión académica evaluadas con una Medida Multidimensional de Afrontamiento (MMA), instrumento que identifica las formas en que los adolescentes se comportan frente a desafíos propios del medio educativo. El proceso de adaptación de la MMA contó con una muestra de 1602 adolescentes colombianos (media de la edad = 12.8; desviación estándar = .98), incluyendo hombres (49.2%) y mujeres estudiantes de colegios públicos (73.2%) y privados. A través de análisis factoriales confirmatorios se estableció la validez del i
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41

Chukwu, E. N., and P. Smoczynski. "A weak invariance principle and asymptotic stability for evolution equations with bounded generators." International Journal of Mathematics and Mathematical Sciences 18, no. 2 (1995): 255–64. http://dx.doi.org/10.1155/s0161171295000317.

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IfVis a Lyapunov function of an equationdu/dt=u′=Zuin a Banach space then asymptotic stability of an equilibrium point may be easily proved if it is known thatsup(V′)<0on sufficiently small spheres centered at the equilibrium point. In this paper weak asymptotic stability is proved for a bounded infinitesimal generatorZunder a weaker assumptionV′≤0(which alone implies ordinary stability only) if some observability condition, involvingZand the Frechet derivative ofV′, is satisfied. The proof is based on an extension of LaSalle's invariance principle, which yields convergence in a weak topolo
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42

Rosero Bolaños, Aldayr David, Juan Sebastián Eraso Meléndez, Fredy Hernán Villalobos Galvis, and Harvey Mauricio Herrera López. "Validación del Cuestionario de Adicción a las Redes Sociales (ARS) en una muestra de adolescentes colombianos." Informes Psicológicos 22, no. 2 (2022): 29–45. http://dx.doi.org/10.18566/infpsic.v22n2a02.

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La adicción a redes sociales es un fenómeno de creciente interés; su ocurrencia tiene impactos negativos sobre los adolescentes, sugiriendo la necesidad de contar con instrumentos idóneos de evaluación. El objetivo fue validar el cuestionario de Adicción a Redes Sociales–ARS a través de la revisión de expertos y el análisis de sus propiedades psicométricas con una muestra incidental de 421 adolescentes (50.8% mujeres) de Pasto, Colombia (11-19 años; M = 15.63; SD = 1.34). Se logró una adecuada adaptación lingüística y óptima validez de contenido y consistencia interna; el análisis factorial co
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43

Lombardi, Olimpia, Mario Castagnino, and Juan Sebastián Ardenghi. "Mecánica cuántica: interpretación e invariancia." THEORIA 24, no. 1 (2009): 5–28. http://dx.doi.org/10.1387/theoria.381.

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El propósito del presente trabajo consiste en analizar los vínculos entre la interpretación modal-hamiltoniana de la mecánica cuántica y las transformaciones de Galileo, a fin de poner de manifiesto que el grupo de tales transformaciones permite reformular la regla de actualización de un modo más básico desde un punto de vista teórico, aplicable a otras teorías cuánticas. Además se argumentará que, bajo esta nueva forma, la regla de actualización manifiesta explícitamente su invariancia frente al grupo de Galileo. The purpose of the present work consists in analyzing the links between the moda
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44

Miller, T. L., та V. G. Miller. "An operator satisfying Dunford's condition (C) but without bishop's property (β)". Glasgow Mathematical Journal 40, № 3 (1998): 427–30. http://dx.doi.org/10.1017/s0017089500032754.

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For X a complex Banach space and U an open subset of the complex plane С, let O (U, X) denote the space of analytic X- valued functions defined on U. This is a Frechet space when endowed with the topology of uniform convergence on compact subsets, and the space X may be viewed as simply the constants in O(U, X). Every bounded operator T on X induces a continuous mapping TU on O(U, X) given by (Tuf)(λ) = (λ – T)f(λ) for every f e O(U, X) and λ e U. Corresponding to each closed F ⊂ С there is also an associated analytic subspace XT(F) = X ∩ ran(7c//F). For an arbitrary T e L(X), the spaces XT(F)
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45

Zhang, Chi, Zhongze Tang, Min Zhang, Bo Wang, and Lei Hou. "Developing a More Reliable Aerial Photography-Based Method for Acquiring Freeway Traffic Data." Remote Sensing 14, no. 9 (2022): 2202. http://dx.doi.org/10.3390/rs14092202.

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Due to the widespread use of unmanned aerial vehicles (UAVs) in remote sensing, there are fully developed techniques for extracting vehicle speed and trajectory data from aerial video, using either a traditional method based on optical features or a deep learning method; however, there are few papers that discuss how to solve the issue of video shaking, and existing vehicle data are rarely linked to lane lines. To address the deficiencies in current research, in this study, we formulated a more reliable method for real traffic data acquisition that outperforms the traditional methods in terms
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46

Núñez, José Carlos, Jianzhong Xu, Fuyi Yang, Natalia Suárez, and Xela Fernández. "Spanish Adaptation of the Homework Approach Scale (HAS)." Anales de Psicología 41, no. 2 (2025): 221–32. https://doi.org/10.6018/analesps.615751.

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The way a student approaches his or her schoolwork has important consequences for learning and academic performance. The objective of the present study was to examine the validity and reliability of the Homework Approach Scale (HAS) in Spanish students in the last cycle of primary education (5th and 6th grade) and the two cycles of compulsory secondary education (7th to 10th grade). The interest of this study lies in the fact that the HAS scale was designed with students from China, but has not been validated in other contexts that may differ culturally, such as Spain. From various schools in
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47

Sánchez Ortiz de Urbina, Ricardo. "La identidad del arte." Eikasía Revista de Filosofía, no. 101 (July 1, 2021): 7–21. http://dx.doi.org/10.57027/eikasia.101.113.

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A principios del siglo XX se produjo la distinción entre conocimientos físicos clásicos y conocimientos físicos cuánticos. Con la relatividad especial (el espacio-tiempo y la equiparación de energía y materia), culmina la física clásica; y con la cuantización de Planck, se inicia una física nueva, con extrañas síntesis sin identidad: transprobabilidad. Pero, en 1915, apareció una distinción aún más profunda, la de los conocimientos propios (que engloban lo clásico y lo cuántico), y los conocimientos impropios. Todo empezó cuando, en la relatividad general de Einstein, no es
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48

Kirkovska, Inga S. "FUTURAL POTENTIAL OF THE PRESENT TENSE IN MODERN FRENCH." Alfred Nobel University Journal of Philology 2, no. 28 (2024): 215–28. https://doi.org/10.32342/3041-217x-2024-2-28-13.

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The present tense is the reference point in the French tense system that connects the future and the past. As it is closely related to both, it can express actions that relate to both the past and the future. Consequently, the primary meanings of the future can be conveyed by other grammatical forms in speech in Indicatif, depending on the context. The object of the study is the form of Présent de l’Indicatif (present actual/nonactual). The subject of the article is the semantic potential and the specifics of the present tense to convey the meaning of the fu- ture tense. The aim of the study i
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49

Isaac, Kwasi Adu, AL-Rahman EL-Nor Osman Mojeeb, and Yang Cuihong. "Mathematical Model of Drinking Epidemic." British Journal of Mathematics & Computer Science 22, no. 5 (2017): 1–10. https://doi.org/10.9734/BJMCS/2017/33659.

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A non-linear mathematical model was used to study the dynamics of drinking epidemic. We discussed the existence and stability of the drinking-free and endemic equilibria. The drinking-free equilibrium was locally asymptotically stable if and unstable if . Global stability of drinking-free and endemic equilibria were also considered in the model, using Lassalle’s invariance principle of Lyapunov functions. Numerical simulations were conducted to confirm our analytic results. Our findings was that, reducing the contact rate between the non-drinkers and heavy drinkers, increasing the number of dr
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50

Apolinario, Marcos Roberto, Thiago Augusto Costa de Oliveira, Lúcio Fernandes Ferreira, Luciano Basso, Umberto César Corrêa, and Andrea Michele Freudenheim. "Efeitos de diferentes padrões respiratórios no desempenho e na organização temporal das braçadas do nado "Crawl"." Revista Brasileira de Educação Física e Esporte 26, no. 1 (2012): 149–59. http://dx.doi.org/10.1590/s1807-55092012000100014.

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O objetivo deste estudo foi investigar os efeitos de diferentes padrões respiratórios no desempenho e na organização temporal das braçadas do nado "Crawl" de atletas de elite. Vinte e um jovens atletas do gênero masculino participaram de forma voluntária do estudo. Eles foram filmados nadando 25 m do nado "Crawl", em velocidade máxima, em quatro condições de respiração: inspiração para o lado preferido (LP); para o lado não preferido (LNP); bilateral (B); e, sem respiração (S). Duas filmadoras digitais (60 fps) captaram as imagens que foram analisadas através do "software" Kinovea 0.8.7 nos 10
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