Results 291 to 300 of about 68,973,280 (347)
Some of the next articles are maybe not open access.
Periodic Fever and Periodic Abdominalgia
Postgraduate Medicine, 1950(1950). Periodic Fever and Periodic Abdominalgia. Postgraduate Medicine: Vol. 8, No. 2, pp. 88-92.
openaire +2 more sources
ChemInform, 2005
Various cages are constructed by using three types of caps: f-cap (derived from spherical fullerenes by deleting zones of various size), kf-cap (obtainable by cutting off the polar ring, of size k), and t-cap ("tubercule"-cap). Building ways are presented, some of them being possible isomerization routes in the real chemistry of fullerenes.
Mircea V. Diudea +5 more
openaire +3 more sources
Various cages are constructed by using three types of caps: f-cap (derived from spherical fullerenes by deleting zones of various size), kf-cap (obtainable by cutting off the polar ring, of size k), and t-cap ("tubercule"-cap). Building ways are presented, some of them being possible isomerization routes in the real chemistry of fullerenes.
Mircea V. Diudea +5 more
openaire +3 more sources
The period of periodic Young modules
Archiv der Mathematik, 2012Let \(k\) be an algebraically closed field of characteristic \(p\). Young modules for the symmetric group \(S_r\) on \(r\) letters form an important class of indecomposable \(kS_r\)-modules, and in particular those Young modules which are periodic have been classified (in terms of their indexing partitions) by Hemmer and Nakano.
openaire +1 more source
Phytoplankton response to polystyrene microplastics: Perspective from an entire growth period.
Chemosphere, 2018Microplastics are widely identified in aquatic environments, but their impacts on phytoplankton have not been extensively studied. Here, the responses of Chlorella pyrenoidosa under polystyrene (PS) microplastics exposure were studied across its whole ...
Yu-Feng Mao +9 more
semanticscholar +1 more source
On Periodic Solutions of the Periodic
Results in Mathematics, 1988By treating the periodic Riccati equation $${\rm\dot{z}=a(t)z^2+b(t)z+c(t)}$$ as a dynamical system on the sphere S, the number and stability of its periodic solutions are determined. Using properties of Moebius transformations, an exact algebraic relation is obtained between any periodic solution and any complex-valued periodic solution.
K. Y. Guan, J. Gunson, H. S. Hassan
openaire +1 more source
European Heart Journal
The prevalence of atrial fibrillation (AF) is increasing worldwide, contributing to a significant healthcare burden. Long-term surveillance is essential to understand evolving trends in epidemiology of AF.
S. Kim +11 more
semanticscholar +1 more source
The prevalence of atrial fibrillation (AF) is increasing worldwide, contributing to a significant healthcare burden. Long-term surveillance is essential to understand evolving trends in epidemiology of AF.
S. Kim +11 more
semanticscholar +1 more source
Geological Society Special Publication, 2019
Summary Twelve rocks for which calculated isotopic ages are mutually consistent and for which there is some biostratigraphic control have been used in the construction of a Permian time-scale.
Denys B. Smith
semanticscholar +1 more source
Summary Twelve rocks for which calculated isotopic ages are mutually consistent and for which there is some biostratigraphic control have been used in the construction of a Permian time-scale.
Denys B. Smith
semanticscholar +1 more source
On the period of sums of discrete periodic signals
IEEE Signal Processing Letters, 1998Unlike the continuous case, given two discrete periodic signals, their sum is always periodic. We give a characterization for the period of the sum; as shown, the least common multiple of the periods of the signals being added is not necessarily the period of the sum.
Alfredo Restrepo Palacios +1 more
openaire +1 more source
On the periods of a periodic function
International Journal of Mathematical Education in Science and Technology, 2005It is known that any nonconstant real-valued periodic function defined on the set of all real numbers is either discontinuous at each point of its domain or has a least positive period. Using the additive semigroup consisting of non-negative periods, we generalize this result by giving a unified proof of the same conclusion when the domain of the given
openaire +1 more source