Results 161 to 170 of about 77,641 (260)

A Geometric Interpretation for the Algebraic Properties of Second‐Order Ordinary Differential Equations

Mathematical Methods in the Applied Sciences, Volume 48, Issue 6, Page 6912-6917, April 2025.
ABSTRACT Nowadays, a substantial portion of investigations concerning the symmetry analysis of differential equations predominantly adhere to a framework comprising the following key procedures: (i) the derivation of symmetries, (ii) the determination of an optimal system, (iii) the utilization of these symmetries to construct invariants or ...
A. Paliathanasis, S. Moyo, P. G. L. Leach   +2 more
wiley   +1 more source

Maxillofacial Surgery Within the Archive of the Greek Surgeon of the 19th Century Theodoros Aretaios (1829-1893). [PDF]

Cureus
Filippidis G, Fragou G, Noskova I, Mourellou E, Zisiadis D, Laios K.   +5 more
europepmc   +1 more source

Dependence of the Extra‐Cellular Diffusion Coefficient on the Fractions of Neurites and Cell Bodies in Gray Matter

Magnetic Resonance in Medicine, EarlyView.
Purpose The dependence of the long‐time (tortuosity) limit of the extra‐cellular diffusivity on the intra‐cellular volume fraction is of fundamental importance for microstructure modeling. While such dependencies have been explored for the white matter, the tortuosity limit in gray matter is unknown due to complex cell composition and geometry. Here we
Hong‐Hsi Lee, Ali Abdollahzadeh, Hansol Lee, Ricardo Coronado‐Leija, Els Fieremans, Susie Y. Huang, Dmitry S. Novikov   +6 more
wiley   +1 more source

Identifying signature features of epidemic diseases from 19th century all-cause mortality data. [PDF]

Am J Epidemiol
Pedersen RK, Ingholt MM, Van Wijhe M, Andreasen V, Simonsen L.   +4 more
europepmc   +1 more source

Pteris madhusoodananii (Pteridaceae), a new fern species from India

Nordic Journal of Botany, EarlyView.
Pteris madhusoodananii sp. nov. (Pteridaceae), from the Kolli hills of Eastern Ghats, India, is described. The new taxon is morphologically distinct, characterized by a unique lamina texture and coloration, specific pinna‐pinnule architecture and distinct spore micromorphology.
Kalathil Sethumadhavan Abhilash, Alex Philip Alen, Thekkekara Suresh Gayathri, Veerankutty Suresh, Jose Sojan, V. K. Sreenivas, Lakshmanan Leeja   +6 more
wiley   +1 more source

Historical geospatial dataset of Cyprus from British administration maps of the 19th century. [PDF]

Data Brief
Papadias E, Kalogeropoulos K, Polykretis C, Psarogiannis A, Chalkias G, Chalkias C.   +5 more
europepmc   +1 more source

A new combination in Strophopappus (Asteraceae, Vernonieae, Lepidaploinae)

Nordic Journal of Botany, EarlyView.
Revisions of herbarium collections reveal a new combination in Strophopappus (Asteraceae, Vernonieae, Lepidaploinae). Strophopappus comprises nine species occurring in South America, eight of which are endemic to Brazil. Currently, Vernonia riedeliana is treated as a synonym of Strophopappus bicolor.
Danielle Remor, Carolina M. Siniscalchi, Benoît Loeuille   +2 more
wiley   +1 more source

Complex traces: Examining morbidity and mortality among 19th Century migrants to South Australia using a Complex Adaptive Systems framework. [PDF]

PLoS One
Gurr A, Brook O'Donnell M, Brook AH.
europepmc   +1 more source

Two new endemic species of Portulaca (Portulacaceae) from the Brazilian Pampa grasslands

Nordic Journal of Botany, EarlyView.
Portulaca L. is a monophyletic, cosmopolitan genus of succulent plants comprising ca 153 species, with particularly high diversity in xerophytic ecosystems in tropical and subtropical regions. Based on morphological evidence, we describe and illustrate two new species from the Brazilian Pampa, Portulaca guaritensis and Portulaca guenoa.
José Roberto Ferraz, Bárbara Pinheiro Moreira, João Marcelo Alvarenga Braga, Leonardo Paz Deble   +3 more
wiley   +1 more source

The first rodent behavioral study (1822) and the diffusion of human-bred albino rats and mice in the 19th century. [PDF]

Front Psychol
d'Isa R.
europepmc   +1 more source