Results 31 to 40 of about 395,045 (283)

Regularized inversion of aerosol hygroscopic growth factor probability density function: Application to humidity-controlled fast integrated mobility spectrometer measurements [PDF]

Atmospheric Measurement Techniques, 2021
Abstract. Aerosol hygroscopic growth plays an important role in atmospheric particle chemistry and the effects of aerosol on radiation and hence climate. The hygroscopic growth is often characterized by a growth factor probability density function (GF-PDF), where the growth factor is defined as the ratio of the particle size at a specified relative ...
J. Zhang, Y. Wang, Y. Wang, S. Spielman, S. Hering, J. Wang   +5 more
openaire   +3 more sources

The role of algebraic solutions in planar polynomial differential systems [PDF]

, 2005
We study a planar polynomial differential system, given by \dot{x}=P(x,y), \dot{y}=Q(x,y). We consider a function I(x,y)=\exp \{h_2(x) A_1(x,y) \diagup A_0(x,y) \} h_1(x) \prod_{i=1}^{\ell} (y-g_i(x))^{\alpha_i}, where g_i(x) are algebraic functions, A_1(
Giacomini, Héctor, Giné, Jaume, Grau, Maite   +2 more
core   +5 more sources

Polynomial inverse integrating factors for polynomial vector fields

Discrete & Continuous Dynamical Systems - A, 2007
We present some results and one open question on the existence of polynomial inverse integrating factors for polynomial vector fields.
Antoni Ferragut, Jaume Llibre, Adam Mahdi   +2 more
openaire   +1 more source

Quantum Fluctuations of Coulomb Potential as a Source of Flicker Noise. The Influence of External Electric Field [PDF]

, 2006
Fluctuations of the electromagnetic field produced by quantized matter in external electric field are investigated. A general expression for the power spectrum of fluctuations is derived within the long-range expansion.
Buckingham M, Handel P H, Handel P H, Kazakov K A, Keldysh L V, Keldysh L V, Kirill A Kazakov, Massiha G H, Milotti E, Povilus A, Schwinger J, Tremblay A-M   +11 more
core   +3 more sources

Limit cycles for Singular Perturbation Problems via Inverse Integrating Factor

Boletim da Sociedade Paranaense de Matemática, 2008
In this paper singularly perturbed vector fields X_{varepsilon} defined in R^2 are discussed. The main results use the solutions of the linear partial differential equation X_{varepslion}V = div(X_{varepslion})V to give conditions for the existence of limit cycles converging to a singular orbit with respect to the Hausdorff distance.
Llibre, Jaume, Medrado, João C.R., Da Silva, Paulo R.   +2 more
openaire   +5 more sources

Modifiable risk factors that mediate the effect of educational attainment on the risk of stroke: a network Mendelian randomization study

Molecular Brain, 2023
Background Stroke is a common cerebrovascular disease with great danger to public health. Educational inequality is a universal issue that influences populations’ stroke risk.
Bangbei Wan, Ning Ma, Zhi Zhou, Weiying Lu   +3 more
doaj   +1 more source

A class of non-integrable systems admitting an inverse integrating factor

Journal of Mathematical Analysis and Applications, 2014
We study the existence of an inverse integrating factor for a class of systems, in general non-integrable, whose lowest-degree quasi-homogeneous term is a Hamiltonian system and its Hamiltonian function only has simple factors over C[x; y].
Algaba Durán, Antonio, Fuentes Díaz, Natalia, García García, Cristóbal, Matemático, Reyes Columé, Manuel   +3 more
openaire   +3 more sources

Tsallis Ensemble as an Exact Orthode

, 2006
We show that Tsallis ensemble of power-law distributions provides a mechanical model of nonextensive equilibrium thermodynamics for small interacting Hamiltonian systems, i.e., using Boltzmann's original nomenclature, we prove that it is an exact orthode.
Abe, Abe, Abe, Abe, Antoni, Bashkirov, Boghosian, Campisi, G.B. Bagci, Gallavotti, Khinchin, M. Campisi, Martínez, Plastino, Ponno, Rényi, Tsallis, Tsallis, Vives, Wilk   +19 more
core   +1 more source

Secondary Data Analytics of Aquaporin Expression Levels in Glioblastoma Stem-Like Cells

Cancer Informatics, 2015
Glioblastoma is the most common brain tumor in adults in which recurrence has been attributed to the presence of cancer stem cells in a hypoxic microenvironment.
Raphael D. Isokpehi, Katharina C. Wollenberg Valero, Barbara E. Graham, Maricica Pacurari, Jennifer N. Sims, Udensi K. Udensi, Kenneth Ndebele   +6 more
doaj   +1 more source

Risk Quantification and Analysis of Coupled Factors Based on the DEMATEL Model and a Bayesian Network

Applied Sciences, 2019
With the developing of high integrations in large scale systems, such as aircraft and other industrial systems, there are new challenges in safety analysis due to the complexity of the mission process and the more complicated coupling characteristic of ...
Jian Jiao, Mengwei Wei, Yuan Yuan, Tingdi Zhao   +3 more
doaj   +1 more source