The acoustoelastic technique for the nondestructive evaluation of stress is based on the stress-induced changes in the speed of wave propagation. In the application of acoustoelasticity. three different approaches have been adopted. For the sake of discussion. we will consider the case of a plane state of stress in an initially isotropic material. The most common technique uses shear waves prop...

When an ultrasonic wave is incident on a water/solid interface generally three waves are excited in the solid: one longitudinal and two shear. The complex amplitudes of the transmitted waves depend on the material properties and the angle of incidence. At incident angles higher than the first critical angle an evanescent longitudinal wave is excited near the surface. To satisfy the boundary con...

A Z3 orbifold compactification of E8×E′ 8 heterotic string is considered toward a trinification SU(3)3 with three light families. The GUT scale VEV’s of the SU(2)W ×U(1)Y × SU(3)c singlet chiral fields in two sets of the trinification spectrum allow an acceptable symmetry breaking pattern toward MSSM. We show that a doublet-triplet splitting is related to the absence of a ∆B nonzero operator. [

Nadir-looking microwave radiometers are flown on different altimeter missions to correct the altimeter range for water vapor and cloud liquid water path delay in the troposphere. Actually four sensors, TOPEX, JASON-1, ERS2, and ENVISAT micro-wave radiometers (MWR) provide continuous measurements and the aim of this paper is to compare their measured brightness temperatures over the same hot ref...

AB: We performed shear-wave splitting of core phases using a subset of 33 selected events within an array composed of 48 broadband stations that spans a 650x350 km area crossing the Lhasa and the southern part of the Qiangtang terranes. Our results reveal the presence of azimuthal anisotropy with small-to-moderate delay times (0.5-1.4s). The consistency of the splitting parameters with respect ...

This paper provides an extensive review of studies related to expert estimation of software development effort. The main goal and contribution of the review is to support the research on expert estimation, e.g., to ease other researcher’s search for relevant expert estimation studies. In addition, we provide software practitioners with useful estimation guidelines, based on the research-based k...

Although the technique of Mcissbauer spectroscopy is now 25-years old and widely used, little empirical work has been done to determine its accuracy in measurements on minerals. To solve this deficiency, two mineral standards (a grunerite and an almandine/andradite garnet mix) have been selected. Precision of the technique was measured through five different sets of experiments seeking to analy...

“Critical reviewers of the biomedical literature have consistently found that about half the articles that used statistical methods did so incorrectly.” (1) “Good research deserves to be presented well, and good presentation is as much a part of the research as the collection and analysis of the data. We recognize good writing when we see it; let us also recognize that science has the right to ...

We developed a new and unified scheme for describing both quark spin and orbital angular momenta in symmetry-breaking chiral quark model. The loss of quark spin in the chiral splitting processes is compensated by the gain of the orbital angular momentum carried by quarks and antiquarks. The sum of both spin and orbital angular momenta carried by quarks and antiquarks is 1/2. The analytic and nu...

The r61e of choline in the nutrition of the young rat has been studied extensively (14). Sure (5) has also shown the need of choline for lactation in mature animals. Its relation to the nutrition of the chick has not been studied, although Abbott and DeMasters (6) concluded that the addition of choline to a skim milk powder-polished rice ration increased egg production and decreased mortality i...