and multiferroic [ 2 ] materials. For instance, ferroelectric materials at morphotropic phase boundaries (MPB), where multiple structural phases with ferroelectric polarizations pointing in different crystallographic directions coexist, often display large piezoelectric coeffi cients. [ 3– 5 ] It is the ferroelectric distortions, which accompany the polarization rotation that leads to enhanceme...

For the usual st raight·line model, in whic h the independent variable ta kes on a fixed, kno wn se t of va lues, it is shown that the sample corre lation coeffi cie nt is distributed as Q with (n-2) degrees of freedom and noncentralit y O=({3 /CT) V~(Xi X)2. The Q variate has been defin ed and studied e lse· where by Hogben et al. It is noted that the square of the correlation coeffi cient is ...

in the present paper the linear oscillator in r3 with z =constanthas been considered. the aim is to determine the necessary conditions forthe persistence of periodic solutions under discontinuous perturbations. a newapproach based on a computational method has been used. at the end weapply our method on an example.

We classify the Q-multiplicity-free skew Schur Q-functions. Towards this result, we also provide new relations between the shifted Littlewood-Richardson coeffi-

The Sit-to-Stand test (STST) involves comparing the change in a person’s non-weight-bearing and weightbearing foot posture to quickly classify a person’s overall foot mobility. Despite the simplicity of the test, its reliability and validity has not been established. The purpose of this study is to determine the intra-rater and inter-rater reliability of the STST as well as its validity. Ninety...

One of the most important issues for Muslim philosophers is the continuous imaginal world and its relationship with the discontinuous imaginative faculty. The continuous imaginal world is a perceptive faculty of the soul known as the faculty of imagination. The discontinuous imaginative faculty is the order of the universe called the imaginal world, which Muslim philosophers have portrayed in a...

This paper proposes a panel unit root test for micropanels with short time dimension (T ) and large cross section (N). There are several distinctive features of this test. First, the test is based on a panel AR(1) model, which allows for cross-sectional dependency, which is introduced by the initial condition’s assumption of a factor structure. Second, the test employs the panel AR(1) model wit...

In this paper we characterize the identified set and construct asymptotically valid and non-conservative confidence sets for the quantile regression coeffi cient in a linear quantile regression model, where the dependent variable is subject to possibly dependent censoring. The underlying censoring mechanism is characterized by an Archimedean copula for the dependent variable and the censoring v...

Wind speed and optical stratifi cation porosity (OSP) were measured at various heights inside a coastal protective forest thinned to different stem densities to assess whether any characteristics of the wind profi le in the coastal protective forest could be predicted from OSP. OSP was defi ned as vertical distribution of the proportion of sky hemisphere not obscured by tree elements inside a f...