The spatial growth of small perturbations developing on a fully developed base flow in a duct with two inhomogeneous cross-flow directions is examined. For a laminar mean flow it is shown that optimally configured vortices at an upstream cross-section induce large transient amplification of a disturbance energy norm downstream. Such a linear growth is a likely initial stage of transition in duc...

A covariant model based on the Bethe-Salpeter formalism is proposed for investigating the solar proton burning process pp → Deνe and the near-threshold deuteron disintegration via electromagnetic and weak interactions. Results of numerical calculations of the energy dependence of relevant cross sections and the astrophysical low-energy cross section factor Spp of the proton burning process are ...

caesarean section is considered as a major surgery which is accompanied by several complications. the present study aimed to determine the effect of behavioral intention model-based educational intervention on reducing the caesarean section among pregnant women. the present interventional study was conducted on 100 primiparous women in the third trimester of pregnancy who were covered by the he...

Introduction:Breast feeding is an essential and noble practice.It helps in proper growth of the baby, creates strong bonding with mother and offers immunity and development of brain.Breastfeeding practices are determined by various factors including cultural norms, beliefs, mother’s knowledge and previous experience. These factors operate differently across communities Aims and Objectives:To fi...

the basic strategy of reduce the ductility demand and related concentrated tensions at moment resistance connections is reduce the section of the beam at connected region to column. by this method plastic hinge done at the reduced cross section and this local reduction decreases the demand of the components of connection. on this basis, in present study a new beam-to-column moment connection wi...

The factor σ is called the interaction cross section and has units of area. It is the probability of a single interaction per unit target point density per unit target region length. A cross section is useful because it isolates the part of the interaction probability that is due to the mechanism of the interaction. An equivalent definition of cross section is the probability of interaction per...

In the first part of the paper we determine bounds for the ranks of certain submatrices of square matrices taken from a prescribed similarity class. Then we discuss the concept of offdiagonal indices (defined in Section 1) which, very roughly speaking, measure, for each given integer s, how far we have to go off the main diagonal of a square matrix, to find an s × s nonzero minor. Some open pro...

Leading postulations in supersymmetry indicate that the Weakly Interacting Massive Particle (WIMP) accounts for the bulk of mass observed as dark matter in the Universe. Cryogenic liquid noble detectors are expected to discover these particles within the next two years. This experiment investigates the limits of detectors designed around the XENON10 prototype in determination of WIMP mass and i...

Under reducing conditions, single crystal of LiYF4 doped with 762 ppm of u3+ were obtained. Absorption andfluorescence spectra of this system are presented as well as the energy level scheme of the lasing 4 4 transition. Oscillator strength and laser cross section between Stark levels of the + 19,2 transition are calculated.

Despite the many axial confinement models already proposed for determination of peak compressive strength fiber-reinforced polymer (FRP) confined concrete columns, they are, in general, applicable only to columns circular or square cross-section, with full partial arrangements. In this study, by proposing a cross-sectional and confining system unification approach, new model is developed calibr...