http://nopr.niscpr.res.in/handle/123456789/24161 2026-10-09T12:03:45Z http://nopr.niscpr.res.in/handle/123456789/24182 Title: Transition foundation modulus for the vibration problem of uniform initially stressed simply supported beams on Winkler foundation Authors: Rao, G Venkateswara Abstract: The phenomenon of the existence of a transition foundation stiffness for the buckling problem of a simply supported column on Winkler foundation is well -known. It is also shown that such a phenomenon does not exist for a simply supported beam for the vibration problem. This paper presents a study of the aforementioned phenomenon with respect to a simply supported beam, subjected to an initial axial load, resting on a Winkler Foundation. Page(s): 92-94 2003-02-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24181 Title: Large amplitude vibrations of slender, uniform beams on elastic foundation Authors: Rao, G Venkateswara Abstract: The large amplitude vibrations of slender, uniform beams, with axially immovable ends, on an elastic foundation are described in this paper. The governing differential equation given by Woinowsky-Krieger is generalised to include the effect of the elastic foundation. The space variable in the differential equation is eliminated, by assuming suitable admissible functions in space to represent the simply supported or clamped boundary conditions at the ends, using the standard Galerkin method. The resulting temporal equation is solved by a numerical integration scheme to obtain the linear and nonlinear frequencies for a specific maximum amplitude. The results obtained, in terms of the ratio of the nonlinear frequency to the linear frequency, when the foundation stiffness is zero, agree well with those available in literature. It is observed from the numerical results that the effect of the elastic foundation reduces the nonlinearity for both the simply supported and the clamped beams. Page(s): 87-91 2003-02-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24180 Title: <span style="font-size:12.0pt;line-height: 115%;font-family:"Times New Roman","serif";mso-fareast-font-family:"Times New Roman"; mso-ansi-language:EN-IN;mso-fareast-language:EN-IN;mso-bidi-language:HI" lang="EN-IN">Spectro-structural and microscopic studies on solution-grown CdS_1-x Te_x thin films</span> Authors: Patil, V B; Shahane, G S; Deshmukh, L P Abstract: Compositional, structural, microstructural and optical properties of thin films of CdS_1-x Te_x (0≤ <i>x</i> ≤1) prepared by the solution-growth technique are reported as a function of <i>x</i>. The film composition has been determined and compared with the bath composition. A non-linear relation has been found between them. The composites are crystalline in nature and pure CdS and CdTe existed in both hexagonal wurtzite and cubic zinc blende structures. Only wurtzite structure undergoes solid solution in the region 0 ≤ <i>x</i> ≤ 0.1and 0.9 ≤ <i>x</i> ≤ 1. For 0.1 < <i>x </i>< 0.9 the films have been composed of the mixed phases of CdS and CdTe. The lattice parameters <i>a</i> and <i>c </i>vary with <i>x </i>following Vegard's law in the solid solution region. The surface topography showed polycrystalline texture with a rough surface and diffused grain structure. Optical studies revealed a high absorption coefficient (10⁴-10⁵ cm^-l) with direct type of transition. Page(s): 82-86 2003-02-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/24179 Title: Preparation of inorganic microfiltration membranes and their characterization Authors: Seshadri, K S; Lal, K B; Kesavamoorthy, R; Muthiah, Pushpa; Selvaraj, M; Krishnasamy, V Abstract: A stud y on the dynamic growth of titania and zirconia layers on microporous alumina was carried out. The porosity of the membrane layers was estimated from the amount of water content in the pores. The thicknesses of the membrane layers were estimated from the membrane volume, membrane pore volume and the coated area of the support. Results indicated that the porosity of the titania and zirconia membranes were 0.31 and 0.38 respectively and the thickness of the layers as 3 micron in a period of 60 min. The membranes were found to be very good to retain suspended panicles. Page(s): 75-81 2003-02-01T00:00:00Z