Results 61 to 70 of about 14,038,334 (310)

The Lx-T, Lx-sigma and sigma-T relations for groups and clusters of galaxies

open access: yes, 2000
While in the hierarchical model of structure formation, groups of galaxies are believed to be the scaled-down version of clusters of galaxies, a similarity breaking in the fundamental laws may occur on the group scale, reflecting a transition between galaxy-dominated and intracluster medium dominated properties.
Xue, Yan-Jie, Wu, Xiang-Ping
openaire   +2 more sources

Robust uncertainty principles: exact signal reconstruction from highly incomplete frequency information [PDF]

open access: yesIEEE Transactions on Information Theory, 2004
This paper considers the model problem of reconstructing an object from incomplete frequency samples. Consider a discrete-time signal f/spl isin/C/sup N/ and a randomly chosen set of frequencies /spl Omega/.
E. Candès, J. Romberg, T. Tao
semanticscholar   +1 more source

Real‐time assay of ribonucleotide reductase activity with a fluorescent RNA aptamer

open access: yesFEBS Letters, EarlyView.
Ribonucleotide reductases (RNR) synthesize DNA building blocks de novo, making them crucial in DNA replication and drug targeting. FLARE introduces the first single‐tube real‐time coupled RNR assay, which enables isothermal tracking of RNR activity at nanomolar enzyme levels and allows the reconstruction of allosteric regulatory patterns and rapid ...
Jacopo De Capitani   +4 more
wiley   +1 more source

Kwong-Wong-type integral equation on time scales

open access: yesElectronic Journal of Differential Equations, 2011
Consider the second-order nonlinear dynamic equation $$ [r(t)x^Delta(ho(t))]^Delta+p(t)f(x(t))=0, $$ where $p(t)$ is the backward jump operator. We obtain a Kwong-Wong-type integral equation, that is: If $x(t)$ is a nonoscillatory solution of the ...
Baoguo Jia
doaj  

Stochastic differential equations with singular coefficients on the straight line

open access: yesAdvances in Difference Equations, 2020
Consider the following stochastic differential equation (SDE): X t = x + ∫ 0 t b ( s , X s ) d s + ∫ 0 t σ ( s , X s ) d B s , 0 ≤ t ≤ T , x ∈ R , $$ X_{t}=x+ \int _{0}^{t}b(s,X_{s})\,ds+ \int _{0}^{t}\sigma (s,X_{s}) \,dB_{s}, \quad 0\leq t\leq T, x\in \
Rongrong Tian, Liang Ding, Jinlong Wei
doaj   +1 more source

Observability of Market Daily Volatility

open access: yes, 2015
We study the price dynamics of 65 stocks from the Dow Jones Composite Average from 1973 until 2014. We show that it is possible to define a Daily Market Volatility $\sigma(t)$ which is directly observable from data.
Petroni, Filippo, Serva, Maurizio
core   +1 more source

Measuring Lean Six Sigma and quality performance for healthcare organizations

open access: yesInternational Journal of Quality and Service Sciences, 2018
Purpose This study aims to investigate applications of Lean Six Sigma approaches and quality performance in Malaysian hospitals. It identifies five dimensions of Lean Six Sigma conformance (i.e.
Selim Ahmed, N. H. Manaf, R. Islam
semanticscholar   +1 more source

Multiple ETS family transcription factors bind mutant p53 via distinct interaction regions

open access: yesFEBS Letters, EarlyView.
Mutant p53 gain‐of‐function is thought to be mediated by interaction with other transcription factors. We identify multiple ETS transcription factors that can bind mutant p53 and found that this interaction can be promoted by a PXXPP motif. ETS proteins that strongly bound mutant p53 were upregulated in ovarian cancer compared to ETS proteins that ...
Stephanie A. Metcalf   +6 more
wiley   +1 more source

Measurement of the cross section for t t ¯ $$ \mathrm{t}\overline{\mathrm{t}} $$ production with additional jets and b jets in pp collisions at s $$ \sqrt{s} $$ = 13 TeV

open access: yesJournal of High Energy Physics, 2020
Measurements of the cross section for the production of top quark pairs in association with a pair of jets from bottom quarks σ t t ¯ b b ¯ $$ \left({\sigma}_{\mathrm{t}\overline{\mathrm{t}}\mathrm{b}\overline{\mathrm{b}}}\right) $$ and in association ...
The CMS collaboration   +2299 more
doaj   +1 more source

Cooling down Levy flights

open access: yes, 2007
Let L(t) be a Levy flights process with a stability index \alpha\in(0,2), and U be an external multi-well potential. A jump-diffusion Z satisfying a stochastic differential equation dZ(t)=-U'(Z(t-))dt+\sigma(t)dL(t) describes an evolution of a Levy ...
Chechkin A V   +16 more
core   +1 more source

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