background: the aim of this study was to compare the accuracy of the apex-locating functions of dentaport zx, raypex 5 and endo master electronic apex locators (eals) in vitro. materials and methods: thirty extracted human single-rooted teeth with mature apices were used for the study. the real working length (rwl) was established by subtracting 0.5 mm from the actual root canal length. all tee...

We consider a branching Brownian motion which starts from 0 with drift μ ∈ R and we focus on the number Zx of particles killed at −x, where x > 0. Let us call μ0 the critical drift such that there is a positive probability of survival if and only if μ > −μ0. Maillard [17] and Berestycki et al. [5] have study Zx in the case μ ≤ −μ0 and μ ≥ μ0 respectively. We complete the picture by considering ...

Primal-dual interior-point path-following methods for semidefinite programming are considered. Several variants are discussed, based on Newton’s method applied to three equations: primal feasibility, dual feasibility, and some form of centering condition. The focus is on three such algorithms, called the XZ, XZ+ZX, and Q methods. For the XZ+ZX and Q algorithms, the Newton system is well defined...

The ZX-Calculus is a powerful diagrammatic language devoted to represent complex quantum evolutions. But the advantages of quantum computing still exist when working with rebits, and evolutions with real coefficients. Some models explicitly use rebits, but the ZX-Calculus can not handle these evolutions as it is. Hence, we define an alternative language solely dealing with real matrices, with a...

OBJECTIVES To compare, in vivo, the accuracy of conventional and digital radiographic methods in determining root canal working length. MATERIAL AND METHODS Twenty-five maxillary incisor or canine teeth from 22 patients were used in this study. Considering the preoperative radiographs as the baseline, a 25 K file was inserted into the root canal to the point where the Root ZX electronic apex ...

We derive a class of ergodic transformations of self-similar Gaussian processes that are Volterra, i.e. of type Xt = ∫ t 0 zX(t, s)dWs, t ∈ [0,∞), where zX is a deterministic kernel and W is a standard Brownian motion. MSC: 60G15; 60G18; 37A25

Upon the transition of dark-adapted plants to low light, the energy-dependent quenching (qE) of excitation energy is only transiently induced due to the only transient generation of the transthylakoid pH gradient. We investigated the transient qE (qE(TR)) in different Arabidopsis (Arabidopsis thaliana) mutants. In dark-adapted plants, qE(TR) was absent in the npq4 mutant (deficient in the PsbS ...

Objective: Root canal anatomy significantly impacts the working length determination. This study aimed to investigate effect of preflaring technique on accuracy four electronic apex locators. Methods: Forty-five single-canal central maxillary teeth were selected. The was measured before and after coronal preparation by types locators in range ±0.5 ±1 mm matched for apical constriction. actual c...

Stereological studies were performed on 20 pairs of adrenal glands of human foetuses. The volume of particular adrenocortical zones, average cell volume and number of parenchymal cells were calculated. In 50 to 320 mm crown-rump length (C.-R.L.) foetuses (9-38 weeks of the intra-uterine life) an exponential increase in adrenal gland weight was found. If compared with the earlier period, the rat...

It is proposed that xanthophylls, and carotenoids in general, may assist in energy transfer from the chlorophyll Soret band to the Q band. Ground-state (1Ag ) and excited-state (1Bu ) optimizations of violaxanthin (Vx) and zeaxanthin (Zx) are performed in an environment mimicking the light-harvesting complex II (LHCII), including the closest chlorophyll b molecule (Chl). Time-dependent density ...