Results 31 to 40 of about 1,542,711 (338)

Is There a Disc in the Superluminal Quasars? [PDF]

, 2003
We present a new evidence of the accretion disc in active galactic nuclei, by examining the properties of the Ha emission line versus viewing angle, in a sample of superluminal (SL) quasars.
Economou, F., Lawrence, A., Mastichiadis, A., Rokaki, E.   +3 more
core   +2 more sources

The Anexact: Delimitating Operations in the work of Sejima and Nishizawa

Materia Arquitectura, 2014
The notion of the “anexact” is introduced as a conceptual framework for the study of the generative systems operating in a set of recurring formal families in the work of Kazuyo Sejima and Ryue Nishizawa.
Miguel Paredes Maldonado
doaj   +1 more source

Penggunaan Etnomatematika Pada Batik Paoman Dalam Pembelajaran Geomteri Bidang di Sekolah Dasar

IndoMath, 2018
This study aims to explore the ethnomatematics contained in Batik Paoman Indramayu and apply it to the learning of geometry field in elementary school. This research is a qualitative research with ethnography approach, where the data collection technique
Sudirman Sudirman, Aloisius Loka Son, Rosyadi Rosyadi   +2 more
doaj   +1 more source

Feature Lines for Illustrating Medical Surface Models: Mathematical Background and Survey

, 2015
This paper provides a tutorial and survey for a specific kind of illustrative visualization technique: feature lines. We examine different feature line methods.
A. Chu, B. Preim, C. Hansen, D. DeCarlo, D. Eberly, D. Marr, E. Hameiri, E. Nadernejad, F. Ritter, J. Goldfeather, J. Zander, K. Hildebrandt, K. Hildebrandt, K. Lawonn, L. Zhang, L. Zhang, M. Burns, M.S. Floater, P. Alliez, P. Svetachov, S. Born, W. Kühnel, W.M. Jainek, X. Xie, Y. Ohtake   +24 more
core   +1 more source

Covariant Space-Time Line Elements in the Friedmann–Lemaitre–Robertson–Walker Geometry

Axioms, 2022
Most quantum gravity theories quantize space-time on the order of Planck length (ℓp ). Some of these theories, such as loop quantum gravity (LQG), predict that this discreetness could be manifested through Lorentz invariance violations (LIV) over ...
David Escors, Grazyna Kochan
doaj   +1 more source

Complex Kerr Geometry and Nonstationary Kerr Solutions

, 2003
In the frame of the Kerr-Schild approach, we consider the complex structure of Kerr geometry which is determined by a complex world line of a complex source. The real Kerr geometry is represented as a real slice of this complex structure.
A. Burinskii, A. Sen, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, A.Ya. Burinskii, Alexander Burinskii, B. Carter, B.S. De Witt, C.A. López, D. Cox, D. Ivanenko, D. Ivanenko, E. Newman, E.T. Newman, E.T. Newman, G.C. Debney, H. Ooguri, H. Ooguri, H. Ruse, O. Veblen, P.C. Vaidya, R. Penrose, R.P. Kerr, R.W. Lind, W. Israel, W. Kinnersley   +28 more
core   +1 more source

THE FULFILLED EUCLIDEAN PLANE [PDF]

, 2009
The fulfilled euclidean plane is the real projective plane, completed with the infinite point of its infinite line denoted new incidence structure. This is a structure with neighbouring elements, in which the unicity of the line through two distinct ...
Vasiu, Adrian, Vasiu, Angela
core   +1 more source

THE EFFECT OF THE EUCLIDEAN GEOMETRY SHORT LEARNING PROGRAMME USING THE WORKED-OUT EXAMPLES TEACHING APPROACH ON MATHEMATICS TEACHERS' PERFORMANCE

JOHME: Journal of Holistic Mathematics Education, 2022
The studies on the worked-out examples teaching approach (WOETA) have been investigated globally and in South Africa, showing gains in learners' performance. This study reports on the Euclidean geometry short learning programme (EGSLP), which used worked-
Msebenzi Rabaza, Joleen Hamilton
doaj   +1 more source

On organizing principles of Discrete Differential Geometry. Geometry of spheres

, 2006
Discrete differential geometry aims to develop discrete equivalents of the geometric notions and methods of classical differential geometry. In this survey we discuss the following two fundamental Discretization Principles: the transformation group ...
Bobenko, Alexander I., Suris, Yuri B.
core   +2 more sources

Photosynthesis under far‐red light—evolutionary adaptations and bioengineering of light‐harvesting complexes

FEBS Letters, EarlyView.
Phototrophs evolved light‐harvesting systems adapted for efficient photon capture in habitats enriched in far‐red radiation. A subset of eukaryotic pigment‐binding proteins can absorb far‐red photons via low‐energy chlorophyll states known as red forms.
Antonello Amelii, Edoardo Andrea Cutolo, Daniele Montepietra, Claudia Battarra, Roberto Caferri, Stefano Capaldi, Zeno Guardini, Luca Dall'Osto, Roberto Bassi   +8 more
wiley   +1 more source