Results 31 to 40 of about 5,018 (278)

A comparative analysis of preprocessing techniques of cardiac event series for the study of heart rhythm variability using simulated signals

Brazilian Journal of Medical and Biological Research, 1998
In the present study, using noise-free simulated signals, we performed a comparative examination of several preprocessing techniques that are used to transform the cardiac event series in a regularly sampled time series, appropriate for spectral analysis
H.N. Guimarães, R.A.S. Santos
doaj   +1 more source

Circulant integral operators as preconditioners for Wiener-Hopf equations

, 1995
In this paper, we study the solutions of finite-section Wiener-Hopf equations by the preconditioned conjugate gradient method. Our main aim is to give an easy and general scheme of constructing good circulant integral operators as preconditioners for ...
Jin, Xiao Qing, Ng, Michael K., Chan, Raymond H.   +2 more
core   +1 more source

A convolution integral equation solved by Laplace transformations [PDF]

Journal of Computational and Applied Mathematics, 1985
The author analyzes the Volterra equation \(p(t)=\int^{t}_{0}K(t- s)p(s)ds+r(t),\) \(t\geq 0\), where K(t), r(t) grow as \(\exp (\alpha t^ 3)\), \(\alpha >0\), for \(t\to \infty\). This rapid growth excludes the straightforward use of Laplace transform techniques; instead the equation is solved using a complex independent variable.
openaire   +3 more sources

On the generalized convolution for F c , F s , and K–L integral transforms [PDF]

Ukrainian Mathematical Journal, 2012
New generalized noncommutative convolutions with weight function \(\gamma(y) = y\) are introduced on the spaces \(L^1(\mathbb R_+, x^\alpha e^{-\beta x}).\) They satisfy the usual factorization equalities with respect to various integral transforms (Fourier sine, Fourier cosine and Kontorovich-Lebedev). Several applications are listed.
Virchenko, N.O., Thao, N.X.
openaire   +2 more sources

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Convolution integral equations with Gegenbauer function kernel

, 1994
In this paper we develop a concise and transparent approach for solving Mellin convolution equations where the convolutor is the product of an algebraic function and a Gegenbauer function. Our method is primarily based on 1.the use of fractional integral/
Van Eijndhoven, S.J.L., Van Berkel, C.A.M., Eijndhoven, van, S.J.L.   +2 more
core   +1 more source

Integral Transforms of Fourier Cosine Convolution Type

Journal of Mathematical Analysis and Applications, 1999
The author investigates integral transforms of the type \[ g(x)= \int^\infty_0 [k(x+ y)+ k(| x-y|)] f(y)dy,\quad x\in\mathbb{R}_+ \] in spaces \(L_p(\mathbb{R}_+)\), \(1\leq p\leq 2\). It is proved that this transformation is a bounded operator from \(L_p(\mathbb{R}_+)\), \(1\leq p\leq 2\) into \(L_q(\mathbb{R}_+)\), \(p^{-1}+ q^{-1}= 1\). Furthermore,
openaire   +2 more sources

pH‐mediated activation of the lysosomal arginine sensor SLC38A9

FEBS Letters, EarlyView.
Cells monitor nutrient levels via the lysosomal transporter SLC38A9 to activate the mechanistic target of rapamycin complex 1 (mTORC1). This study reveals that SLC38A9 function is regulated by pH. We identified histidine 544 as a critical pH sensor that undergoes conformational changes to control amino acid efflux from lysosomes; therefore, it ...
Xuelang Mu, Ampon Sae Her, Tamir Gonen
wiley   +1 more source

Transcriptional network analysis of PTEN‐protein‐deficient prostate tumors reveals robust stromal reprogramming and signs of senescent paracrine communication

Molecular Oncology, Volume 20, Issue 6, Page 1429-1452, June 2026.
Combining PTEN protein assessment and transcriptomic profiling of prostate tumors, we uncovered a network enriched in senescence and extracellular matrix (ECM) programs associated with PTEN loss and conserved in a mouse model. We show that PTEN‐deficient cells trigger paracrine remodeling of the surrounding stroma and this information could help ...
Ivana Rondon‐Lorefice, Jose I. Lopez, Aitziber Ugalde‐Olano, Maite Zufiaurre, Ianire Astobiza, Natalia Martin‐Martin, Laura Bozal‐Basterra, Saioa Garcia‐Longarte, Amaia Zabala‐Letona, Sofia Rey, Aida Santos‐Martin, Miguel Unda, Ana Loizaga‐Iriarte, Mariona Graupera, Paolo Nuciforo, Arkaitz Carracedo, Isabel Mendizabal   +16 more
wiley   +1 more source

Design And Implementation Of Radix-4 Fast Fourier Transform In Asia Chip With 0.18 M Standard CMOS Technology [TK5102.9. S624 2008 f rb]. [PDF]

, 2008
Jelmaan Fourier pantas (FFT) merupakan blok yang penting dan digunakan secara meluas dalam algoritma pemprosesan isyarat digital. The Fast Fourier Transform (FFT) is a critical block and widely used in digital signal processing ...
Palaniappan, Siva Kumar
core