On almost πgp-continuous functions

We introduce the notion of almost πgp-continuous functions. The characterizations of almost πgp-continuous functions and preservations theorems are obtained. Also, the implications between all related forms of continuities and almost πgp-continuity are discussed.     

⋆-Extremally disconnected ideal topological spaces

The notion of ?-extremally disconnected ideal topological spaces is introduced and studied. Many characterizations of the space are obtained.     

A laboratory investigation of noise reduction by riblike structures on the ground

This paper investigates the use of periodically spaced edges or wells for the control of road traffic noise. The wells have uniform height and width and are placed on the ground. Physical scale modeling is used to assess the acoustic performance of these structures under laboratory conditions. It is shown that, in certain situations where the use of conventional barriers would not be appropriate, strategically designed riblike structures can provide insertion losses of typically 10-15 dB. The findings are explained in terms of acoustic scattering with the approaches used in the study of resonators and diffraction/interference gratings.     

An infrared and raman spectroscopic study of pyrazinecadmium (II) tetracyanometalate (II) Benzene (1/1) clathrates: Cd(C4H4N2)Cd(CN)4⁗C6H6 and Cd(C4H4N2)Hg(CN)4⁗C6H6

Two new benzene clathrates of the form Cd(Pyrazine)M(CN)₄C₆H₆, where M = Cd or Hg, have been prepared and their infrared and Raman spectra are reported.