Results 61 to 70 of about 20,904 (174)

Cosmological implications of massive gravitons

, 2009
The van Dam-Veltman-Zakharov (vDVZ) discontinuity requires that the mass $m$ of the graviton is exactly zero, otherwise measurements of the deflection of starlight by the Sun and the precession of Mercury's perihelion would conflict with their ...
Abramowitz, Arun, Carroll, Cramér, Creminelli, Deffayet, Deffayet, Dolgov, Donald H. Eckhardt, Ephraim Fischbach, Gabadadze, Goldhaber, Gruzinov, Hartle, Hicken, José Luis G. Pestaña, Lange, Maggiore, Peebles, Perlmutter, Riess, Riess, Riess, Sethi, Spergel, Talmadge, Tammann, Vainshtein, van Dam, Visser, Will, Will, Wolfram, Zakharov, Zee   +34 more
core   +1 more source

Analysis of a Mathematical Model of Marital Satisfaction

Mathematical Methods in the Applied Sciences, Volume 49, Issue 7, Page 6143-6157, 15 May 2026.
ABSTRACT A large number of marriages end in divorce. In this paper, we present a model for the emotional state of a couple based on bilinear ordinary differential equations. We study the effect of changes of each individual's self‐emotional state on the couple's state.
Benito Chen‐Charpentier, C. E. Garza‐Hume, M. C. Jorge   +2 more
wiley   +1 more source

Reductionism and the Universal Calculus [PDF]

, 2016
In the seminal essay, "On the unreasonable effectiveness of mathematics in the physical sciences," physicist Eugene Wigner poses a fundamental philosophical question concerning the relationship between a physical system and our capacity to model its ...
Sarma, Gopal P.
core   +1 more source

Cryo‐EM Structures Reveal the Molecular Basis of Asymmetric Allosteric Activation by MMOB in the Hydroxylase of Soluble Methane Monooxygenase

Advanced Science, Volume 13, Issue 19, 2 April 2026.
Cryo‐EM analysis reveals an asymmetric MMOH–MMOB complex with distinct protomers, where MMOB binding triggers structural rearrangements from the surface to the active site. This conformational asymmetry shortens the Fe···Fe distance to 2.7 Å in one protomer, forming a geometry suitable for O2 activation and supporting a sequential catalytic mechanism ...
Yunha Hwang, Bumhan Ryu, Soyeon Park, Dong‐Heon Lee, Hyo Jin Hong, Jeong‐Geol Na, Chul Gyu Song, Hyun Goo Kang, Edwin Pozharski, Seung Jae Lee   +9 more
wiley   +1 more source

Crystal growth and structural analysis of perovskite chalcogenide BaZrS$_3$ and Ruddlesden-Popper phase Ba$_3$Zr$_2$S$_7$

, 2019
Perovskite chalcogenides are gaining substantial interest as an emerging class of semiconductors for optoelectronic applications. High quality samples are of vital importance to examine their inherent physical properties. We report the successful crystal
Bianco, Elisabeth, Haiges, Ralf, Jaramillo, R., McConney, Michael E., Niu, Shanyuan, Ravichandran, Jayakanth, Settens, Charles, Ye, Kevin, Zhao, Boyang, Zhou, Jieyang   +9 more
core   +1 more source

Ambiguities in Assigning Single‐Crystal NMR Data to Individual Atoms in the Crystal Structure: A Case Study of Hambergite, Be2BO3OH, by 9Be and 11B NMR Spectroscopy, XRD Measurements and DFT Calculations

Magnetic Resonance in Chemistry, Volume 64, Issue 4, Page 400-415, April 2026.
The fundamental question of how to assign NMR resonances to specific atoms in the unit cell is addressed by using the 9Be and 11B spectra of the natural mineral hambergite as a model system. ABSTRACT The NMR interaction tensors of 9Be and 11B of hambergite, Be 2BO 3OH, were derived from single‐crystal NMR experiments.
Jennifer Steinadler, Georg Krach, Kristian Witthaut, Tobias Stürzer, Rupert Hochleitner, Wolfgang Schnick, Thomas Bräuniger   +6 more
wiley   +1 more source

Numerical-symbolic methods for searching relative equilibria in the restricted problem of four bodies

Mathematical Modelling and Analysis, 2018
We discuss here the problem of solving the system of two nonlinear algebraic equations determining the relative equilibrium positions in the planar circular restricted four-body problem formulated on the basis of the Euler collinear solution of the three-
Alexander N. Prokopenya
doaj   +1 more source

Automatic calculation of symmetry‐adapted tensors under spin‐group symmetry: STENSOR, a new tool of the Bilbao Crystallographic Server

Journal of Applied Crystallography, Volume 59, Issue 2, Page 640-647, April 2026.
STENSOR automatically computes symmetry‐adapted tensors under spin and magnetic point groups. It generates tensors for both spin and magnetic point groups from structural data files or spin‐group generators. The comparison permits separation of the effects due to spin–orbit coupling from non‐relativistic contributions, as illustrated by examples.We ...
Luis Elcoro, Jesus Etxebarria, J. Manuel Perez-Mato, Emre S. Tasci   +3 more
wiley   +1 more source

By way of introduction: Modelling living systems, their diversity and their complexity: some methodological and theoretical problems☆☆Used and referenced software: Excel (Microsoft), Statview (SAS Institute), Mathematica (Wolfram Research) and Maple (Waterloo Maple Inc.), Grapher (application Mac OS.10.4, Apple Computer Inc.) and Dynamac (cf. 3).

Comptes Rendus. Biologies, 2005
Some principles for a current methodology for biological systems' modelling are presented. It seems possible to promote a model-centred approach of these complex systems. Among present questions, the role of mechanisms producing random or quasi-random issues is underlined, because they are implied in biological diversification and in resulting ...
openaire   +1 more source

Active Learning in Sophomore Mathematics: A Cautionary Tale [PDF]

, 2000
Math 245: Multivariate Calculus, Linear Algebra, and Differential Equations with Computer I is the first half of a year-long sophomore sequence that emphasizes the subjects\u27 interconnections and grounding in real-world applications.
Eisenberg, M.
core   +1 more source