Browsing Faculty Research Publications by Title
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(La0.4Ba0.4Ca0.2)(Mn0.4Ti0.6)O3: A new titanomanganate with a high dielectric constant and antiferromagnetic interactions
(2004)A new perovskitebased titanomanganate, (La0.4Ba0.4Ca0.2)(Mn0.4Ti0.6)O3, has been prepared by the ceramic route at 1100°C. This oxide was found to possess the cubic perovskite structure with ‘a’=3.9477(23) Å (space group ... 
Lactose hydrolysis by Lactozym™ immobilized on cellulose beads in batch and fluidized bed modes
(2003)Lactozym™ is a commercially available preparation of βgalactosidase from Kluyveromyces fragilis. It has valid generally recognized as safe (GRAS) status for whey hydrolysis and production of low lactose milk. Immobilized ... 
Laminar convection of nonNewtonian fluids in the thermal entrance region of coiled circular tubes
(2002)The governing equations for fully developed laminar flow and heat transfer in the thermal entrance region of circular curved tubes are solved numerically for power law fluids. Detailed descriptions of the secondary velocity ... 
Larvicidal and mosquito repellent action of peppermint (Mentha piperita) oil
(2000)Oil of Mentha piperita L. (Peppermint oil), a widely used essential oil, was evaluated for larvicidal activity against different mosquito species: Aedes aegypti, Anopheles stephensi and Culex quinquefasciatus by exposing ... 
Larvicidal and repellent actions of Dalbergia sissoo Roxb. (F. Leguminosae) oil against mosquitoes
(2000)Studies were carried out to evaluate the larvicidal, growth inhibitor and repellent actions of D. sissoo oil against Anopheles stephensi, Aedes aegypti and Culex quinquefasciatus under laboratory conditions. Pure oil was ... 
Laser induced heating and emission of electrons from metallic targets
(1999)A high power laser incident on a metallic target heats the electrons in the skin layer within a few ps. For a specific dependence of electron–phonon collision frequency on electron temperature, vxte1/2 the steady state ... 
Lasercontrolled photoluminescence characteristics of silicon nanocrystallites produced by laserinduced etching
(2003)Various laser wavelengths have been employed to synthesize luminescent nanocrystallites of ntype silicon by laserinduced etching (LIE) process. These nanocrystallites exhibit light emission in the visible region. Both ... 
Laserinduced etching of CrO doped GaAs and wavelength dependent photoluminescence
(2004)The laserinduced chemical etching mechanism of CrO doped GaAs (1 0 0) substrate in 40% HFH2O solution is explained by the generation of e–h pairs through defect states in the presence of subbandgap photon illumination ... 
Lateral compression of a square or rectangular tube between two parallel narrow width indenters placed nonorthogonally
(1995)Collapse behavior of aluminum tubes of square and rectangular crosssections,when compressed between two identical narrow width indenters placed symmetrically in parallel alignment, is examined. Experiments were performed ... 
Lateral crushing of square and rectangular tubes by nonorthogonally placed naroow width indenters
(1995)A study of the collapse behaviour of square or rectangular tubes subjected to transverseloading by narrow width indenters, placed in orthogonal and nonorthogonal positions is presented.Experiments were conducted on ... 
Lateraltorsional motion of tall buildings to alongwind forces
(1994)The study is concerned with the threedimensional response of tall buildings (rectangular in plan) to alongwind dynamic forces. For the response analysis, a method based on a spectral approach with matrix formulation is ... 
Lattice dynamical calculations of deficient NaCl superstructuretype Li2CoCl4 and Li2MnBr4
(1997)Lattice dynamical calculations on SnMn$i.,type (ordered deficient NaCl superstructure) Li2CoCb and Li2MnBr4 were performed using a shortrange force constant model. The results obtained reveal that the assignments of the ... 
A lattice dynamical investigation for the zonecentre phonon frequencies of the NaMnF3 perovskite
(1996)A short range force constant model has been applied to investigate the lattice dynamics of NaMnF3 in its orthorhombic phase. The calculated zoneeentre Raman frequencies agree fairly well with the measured values. The infra ... 
A lattice dynamical investigation of Raman and infrared wavenumbers at the zone center of the orthorhombic NdNiO3 perovskite
(2003)A shortrange force constant model has been applied for the first time to investigate the phonons in NdNiO3 perovskite in the orthorhombic phase. The calculations with the ten stretching and ten bending force constants ... 
A lattice dynamical investigation of the Raman and the infrared frequencies of the cubic A2 Sn2 O7 pyrochlores
(2001)A short range force constant model has been applied for the first time to investigate the Raman and the infrared frequencies in A2Sn2O7 (A=La, Sm, Yb, Lu) pyrochlores in their cubic phase of space group Fd3m. The calculations ... 
A lattice dynamical investigation of the Raman and the infrared frequencies of the cubic A2Hf2O7 pyrochlores
(2002)A short range force constant model has been applied for the first time to investigate the Raman and the infrared frequencies in A2Hf2O7 (A=La, Nd, Sm, Eu) pyrochlores in their cubic phase of space group . The calculations ... 
A lattice dynamical investigation of the zone center frequencies of the orthorhombic NdGaO3 perovskite
(2001)A short range force constant model has been applied for the first time to investigate the phonons in NdGaO3 perovskite in the orthorhombic phase. The calculations of phonons have been made with 10 stretching and 10 bending ... 
Lattice dynamics of orthorhombic perovskite YMnO3
(1999)A shortrange force constant model has been applied to investigate the phonons in YMnO 3 perovskite in the orthorhombic phase. The calculations with six stretching and two bending force constants provide a satisfactory ... 
Lattice Dynamics of OxideSpinel ZnCr2O4
(1993)The shortrange force model has been applied to study the zonecenter phonon frequencies of oxidespinel ZnCr2O4. A comparative study of interatomic forces is also made between oxide spinel ZnCr2O4 and chromium sulfide/selenide ... 
Lattice dynamics of superconducting oxide spinel LiTi2O4
(1997)The phonons in superconducting oxide spine1 LiTi204 are investigated using a shortrange force constant model. The theoretical Raman frequencies agree satisfactorily with the experiment. The superconducting transition ...