This paper addresses the problem of image denoising which is still a valid challenge at the crossing of functional analysis and statistics. We herein propose a novel pixel-based algorithm, which formulates the image denoising problem as the maximum a posterior (MAP) estimation problem using Markov random fields (MRFs). Such an MAP estimation problem is equivalent to a maximum likelihood (ML) es...

in this paper, we investigate the existence of positive solutions for the ellipticequation $delta^{2},u+c(x)u = lambda f(u)$ on a bounded smooth domain $omega$ of $r^{n}$, $ngeq2$, with navier boundary conditions. we show that there exists an extremal parameter$lambda^{ast}>0$ such that for $lambda< lambda^{ast}$, the above problem has a regular solution butfor $lambda> lambda^{ast}$, the probl...

Methylmercury is one of the most typical environmental pollutants, and many studies on its toxicity and metabolism have been performed. A methylmercury solution prepared for experiments generally contains a trace amount of inorganic mercury. To obtain accurate experimental results an inorganic mercury-free methylmercury preparation should be employed for toxicological studies, because behavior ...

Denaturation was examined for the first time in a ternary mixed solution of water/hydrophilic/hydrophobic organic solvent using λ-DNA and a plasmid as models. The absorbance of λ-DNA and the plasmid at 260 nm gradually increased for several days up to 1.68 and 1.38 times the initial values, respectively, in a water/acetonitrile/ethyl acetate (15:3:2, volume ratio) mixed solution, whereas there ...

Numerical methods for the solution of large scale structured quadratic eigenvalue problems are discussed. We describe a new extraction procedure for the computation of eigenvectors and invariant subspaces of skew-Hamiltonian/Hamiltonian pencils using the recently proposed skew-Hamiltonian isotropic implicitly restarted Arnoldi method (SHIRA). As an application we discuss damped gyroscopic syste...

BACKGROUND Propofol is a widely used, short-acting, and intravenously administered hypnotic agent with notable antioxidant and free radical scavenging activities. However, there are relatively few kinetic studies on the free radical scavenging ability of propofol. The goal of this study is to evaluate the kinetics of propofol scavenging 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (A...

In this paper we compare the performance of Minton’s et al. min-conflicts hill-climbing (MCHC) algorithm [16], Wallace and Freuder’s MCHC algorithm [25], Morris’ breakout algorithm (BA) [17, 18], and modified variants of the BA that we developed on static constraint satisfaction problems (CSPs) and recurrent dynamic constraint satisfaction problems (rDCSPs). Also, we used a simple evolutionary ...

The guinea pig (Cavia porcellus) is a natural reservoir for Trypanosoma cruzi but has seldom been used as an experimental infection model. We developed a guinea pig infection model for acute and chronic Chagas disease. Seventy-two guinea pigs were inoculated intradermally with 10(4) trypomastigotes of T. cruzi strain Y (experimental group); 18 guinea pigs were used as control group. Eight anima...

in this research the effect of potrecine, spermine and spermidine on the postharvest life of cut red carnation (corsa) and some physiological trait was investigated in horticultural lab of azad university. therefore, an experiment based on completely randomized block design with tree levels of putrescine (1, 2 and 3) mm and spermidine (0.5, 1 and 2) and spermine (1, 2 and 3) mm with 3 replicati...

We describe a new technique for monitoring intra-cuvette temperatures in temperature-controlled spectrophotometric cells by use of two solutions, one for which absorbance is highly sensitive to temperature and one for which absorbance is insensitive to temperature. The first solution, cresol red in tris(hydroxymethyl)aminomethane buffer, is used to construct an absorbance-vs.-temperature calibr...