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Yayın A modified reductive perturbation method as applied to nonlinear ion-acoustic waves(Physical Society Japan, 1999-06) Demiray, HilmiThe basic equations describing the nonlinear ion-acoustic waves in a cold collisionless plasma, in the longwave limit, is re-examined through the use of a modified reductive perturbation method. Introducing the concept of a scale parameter and expanding the variables and the scale parameter into a power series of the smallness parameter epsilon, a set of evolution equations is obtained for various order terms in the perturbation expansion. To illustrate the present derivation, a localized travelling wave solution is studied for the derived field equations and the result is compared with those of obtained by Sugimoto and Kakutani(3)) who introduced some slow scales, Kodama and Taniuti(4)) who employed the renormalization method and Malfliet and Wieers,(6)) who employed the dressed solitary wave approach from the outset of their study.Yayın Kinematic analysis of robotic bevel-gear trains: An application of network model approach(Springer Netherlands, 1998-04) Uyguroğlu, Mustafa Kemal; Tokad, YılmazThe network model approach for rigid and multi-rigid body systems developed recently [1,2] can also be used conveniently in formulating system equations or equations of motion of three-dimensional mechanical systems of interconnected rigid bodies. In this article, this method is further elaborated for establishing only the kinematics of spatial robotic bevel-gear trains. However the dynamic analysis of such systems using the same method is also possible and will be taken up in a future publication.Yayın Assessing the (in-)consistency of same-sex and opposite-sex peer nominations among Turkish elementary-school children(PsychoeduationalL Corp, 1997-09) Chimienti, GiovanniNomination procedures for assessing peer behaviors are in wide use, and mixed-sex peer nominations are often utilized under the assumption that combined same-and opposite-sex nominations yield a representative picture of children's behaviors and relationships to other variables. Analyses of nominations made by 457 Turkish third and fifth graders for 14 peer behaviors and for liked-/disliked-a-lot illustrate the productiveness of separately assessing same-sex and opposite-sex nominations, showing that: (a) a bias toward more nominations for same-sex peers is not consistent over all behaviors; and (b) although same-sex and combined same-/opposite-sex nominations are strongly related, the agreement between same-and opposite-sex nominations is substantially Lower. The outcome is that (a) sociometric status classification depends on the nominating population and (b) the relationship between-peer-assessed behaviors and peer acceptance/peer sociometric status can differ; depending upon whether the reference group is same-or opposite-sex peers. Findings bring into question the routine use of mixed-sex nominations.
