Integration of electrostatic and fluid dynamics within a dust devil

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/94610/1/jgre2050.pd

Colorimetric Estimation of Ni(II) Ions in Aqueous Solution

A rapid and accurate colorimetric method has been proposed for the estimation of nickel(II) in aqueous solution. It is found that nickel(II) ions have maximum absorbance at 393 nm in distilled water and in aqueous sucrose solution (0.3 mol dm-3). In both case, the Beer’s law was obeyed over the range from 0.04 to 0.08 mol dm -3 of nickel(II).The value of molar absorpitivity was constant 5.13±0.03 mol dm-3. This method is more rapid than the existing spectrophotometeric methods for the estimation of nickel(II). The variation in the results obtained by the method is ±2.1%

Low field room temperature magnetism and band gap modifications in Sm doped SnO2

The structural, optical and magnetic properties of pure and Sm doped SnO2 nanoparticles synthesized in aqueous solution by a low cost chemical co-precipitation method without using any stabilizing agent have been reported. X-ray diffraction analysis reveals that the crystallite size of SnO2 decreases with the increase of Sm doping into the SnO2 matrix. The calculated value of optical band gap of undoped SnO2 nanoparticles is calculated to be 2.65 eV and it anomalously increases with the increase of Sm3+ concentration. The band gap of undoped SnO2 nanoparticles is found to be lower than those reported for bulk SnO2 (3.6 eV) that may be due to the presence of defects, oxygen vacancies and non-stoichiometry of SnO2 nanoparticles. All the undoped and Sm doped SnO2 nanoparticles show weak room temperature magnetism in the range of applied low magnetic field region of 2000 Oe due to the presence of defects and oxygen vacancies. All the samples exhibit negative magnetic susceptibility for the applied magnetic field higher than 2000 Oe. The strong optical absorption with weak magnetic properties at room temperature may serve the SnO2 nanomaterials as a potential candidate for many DMS, spintronics, and optoelectronics based applications

Magnetic and electrical properties of manganese and cadmium co-substituted lithium ferrites

Manganese and cadmium co-substituted lithium ferrite having the general formulae Li0.35Cd0.3MnxFe2.35−xO4 + 0.10 wt% Bi2O3 with x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 has been prepared by standard ceramic technique. M–H curves of all samples have been determined by using vibrating sample magnetometer (VSM). The highest saturation magnetization 79 emu/g is observed in Li0.35Cd0.3Fe2.35O4 (Mn = 0) and it decreases with increase in manganese content in the compound. It is observed that the value of initial permeability increases to maximum value ∼230 for Mn = 0.4 and then decreases with further increase in Mn contents. The dc resistivity of all samples is found in the range of 107 Ω cm

Variation in Ground Electric Field due to Various Forms of Intracloud Lightning Discharges

104-109The calculations for instantaneous and total changes in ground electric field due to various forms of intracloud lightning discharges are presented. To place in perspective the significance of the individual form of intra cloud discharge, three possible cases, namely, propagation of positive, negative and complex streamers have been studied separately. The important aspects of thunderclouds such as spatially inhomogeneous charge distribution, redistribution of charge due to propagation of streamers, and concept of finite dimensions of streamers and thunderclouds have been taken into account. The present study points out the incapability of the electric field variation dependent hypothesis to distinguish between a negative and a complex streamer because both these streamers produce negative changes in ground electric field. Our theoretical findings suggest that a more convincing hypothesis to classify the nature of intracloud discharges should incorporate magnitudes of electric field variations along with the nature of electric field changes. Plots of total electric field change against distance of observing point show a reasonable agreement with the observed magnitude variations and electric field sign reversal distances at ground

Multifunctional behaviour of nanostructured Pb0.7Sr0.3(Fe0.012Ti0.988)O3 thin film

Structural, magnetic, electrical and optical properties of the Pb0.7Sr0.3(Fe0.012Ti0.988)O3 (PSFT) thin film have been studied. The PSFT solution was prepared by the sol–gel combined metallo-organic decomposition method and deposited on Si, Pt/Ti/SiO2/Si and fused quartz substrates by the spin-coating technique. The superparamagnetic relaxation between bulk nanoparticles and film nanograins has been done. The insulating gaps between the PSFT nanograins made symmetrically coupled plasmon modes and explored their potential in magneto-optic data storage, light generation, microscopy and bio-photonics

Identification, expression analysis and molecular modeling of <i>Iron deficiency specific clone 3</i> (<i>Ids3</i>) like gene in hexaploid wheat

AbstractGraminaceous plants secrete iron (Fe) chelators called mugineic acid family phytosiderophores (MAs) from their roots for solubilisation and mobilization of unavailable ferric (Fe3+) ions from the soil. The hydroxylated forms of these phytosiderophores have been found more efficient in chelation and subsequent uptake of minerals from soil which are available in very small quantities. The genes responsible for hydroxylation of phytosiderophores have been recognized as iron deficiency-specific clone 2 (Ids2) and iron deficiency-specific clone 3 (Ids3) in barley but their presence is not reported earlier in hexaploid wheat. Hence, the present investigation was done with the aim:(i) to search for the putative Hordeum vulgare Ids3 (HvIds3) ortholog in hexaploid wheat, (ii) physical mapping of HvIds3 ortholog on wheat chromosome using cytogenetic stocks developed in the background of wheat cultivar Chinese Spring and (iii) to analyze the effect of iron starvation on the expression pattern of this ortholog at transcription level. In the present investigation, a putative ortholog of HvIds3 gene was identified in hexaploid wheat using different bioinformatics tools. Further, protein structure of TaIDS3 was modelled using homology modeling and also evaluated modelled structure behavior on nanoseconds using molecular dynamics based approach. Additionally, the ProFunc results also predict the functional similarity between the proteins of HvIds3 and its wheat ortholog (TaIds3). The physical mapping study with the use of cytogenetic stocks confines TaIds3 in the telomeric region of chromosome 7AS which supports the results obtained by bioinformatics analysis. The relative expression analysis of TaIds3 indicated that the detectable expression of TaIds3 induces after 5th day of Fe-starvation and increases gradually up to 15th day and thereafter decreases till 35th day of Fe-starvation. This reflects that Fe deficiency directly regulates the induction of TaIds3 in the roots of hexaploid wheat.</jats:p