MLS University

Udaipur, India

MLS University

Udaipur, India
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Singhal R.K.,University of Rajasthan | Kumari P.,University of Rajasthan | Kumar S.,MLS University | Dolia S.N.,University of Rajasthan | And 5 more authors.
Journal of Physics D: Applied Physics | Year: 2011

The evolution of reversible room temperature ferromagnetism (RTFM) has been investigated in Co- and Fe-doped (5% each) and non-doped CeO2 polycrystalline samples. Specimens with different oxygen vacancy (VO) concentration including the (i) as-synthesized, (ii) hydrogenated and (iii) re-annealed in air were investigated using SQUID magnetometry, x-ray diffraction and x-ray photoelectron spectroscopy. The influence of the electronic properties on the RTFM was examined/analysed systematically. Our findings confirm that the ferromagnetism observed in CeO2 originates due to the oxygen vacancies, supporting the VO mediated ferromagnetic exchange mechanism. Additionally, the cationic (cerium and transition metal) valence states play a crucial role. © 2011 IOP Publishing Ltd.

Sunda S.,Airports Authority of India | Vyas B.M.,Mls University | Khekale P.V.,Space Applications Center
Advances in Space Research | Year: 2013

The total electron content (TEC) measurements from a network of GPS receivers were analyzed to investigate the storm time spatial response of ionosphere over the Indian longitude sector. The GPS receivers from the GPS Aided Geo Augmented Navigation (GAGAN) network which are uniquely located around the ∼77 E longitude are used in the present study so as to get the complete latitudinal coverage from the magnetic equator to low mid-latitude region. We have selected the most intense storms but of moderate intensity (-100 nT < Dst < -50 nT) which occurred during the unusually extremely low solar activity conditions in 2007-2009. Though the storms are of moderate intensity, their effects on equatorial to low mid-latitude ionosphere are found to be very severe as TEC deviations are more than 100% during all the storms studied. Interesting results in terms of spatial distribution of positive/negative effects during the main/early recovery phase of storms are noticed. The maximum effect was observed at crest region during two storms whereas another two storms had maximum effect near the low mid-latitude region. The associated mechanisms like equatorial electrodynamics and neutral dynamics are segregated and explained using the TIMED/GUVI and EEJ data during these storms. The TEC maps are generated to investigate the storm time development/inhibition of equatorial ionization anomaly (EIA). © 2013 COSPAR. Published by Elsevier Ltd. All rights reserved.

Sharma S.,Mls University | Dashora N.,National Atmospheric Research Laboratory | Galav P.,Mls University | Pandey R.,Mls University
Journal of Atmospheric and Solar-Terrestrial Physics | Year: 2010

The longest total solar eclipse during the 21st century occurred in South and East Asia on July 22, 2009. Ionospheric response to this rare total solar eclipse which was observed right from the time of sunrise in the Indian zone, has been studied in terms of the total electron content (TEC) obtained from three global positioning system (GPS) receivers located at Udaipur, Hyderabad and Bengaluru, and electron density obtained using space based GPS-Radio Occultation technique. The study reveals significant reductions in the electron density and TEC that persisted up to 2. h past the last contact even during early morning eclipse. These observations imply that during the early morning eclipse, the production and loss of ionization dominate over the plasma transport processes. © 2010 Elsevier Ltd.

Galav P.,Mls University | Dashora N.,National Atmospheric Research Laboratory | Sharma S.,Mls University | Pandey R.,Mls University
Journal of Atmospheric and Solar-Terrestrial Physics | Year: 2010

We present the mean diurnal, seasonal and annual variations in TEC during the lowest solar activity phase from low latitude Indian zone recorded at Udaipur (Geog. Lat. 24.6°N, Geog. Long.73.7°E, Geomag. Lat. 15.6°N) using a GPS receiver. Seasonal variations in daytime TEC show a semiannual periodicity, with a minimum in winter. Results of seasonal variations have been compared with that of the IRI-2007 model. Model calculations reveal significant seasonal as well as longitudinal differences in TEC. Seasonal variations in the nighttime TEC reveal an annual periodicity. Near the crest of the EIA, TEC shows a very good correlation with the solar flux. The results also point to weakening of the anomaly crest as well as its spatial and temporal contraction with declining solar activity. © 2010 Elsevier Ltd.

Tyagi A.,MLS University | Sharma K.,Medi Caps Institute of Science and Technology
Chinese Physics Letters | Year: 2010

We investigate the Bianchi type-V magnetized string cosmological model with variable magnetic permeability for viscous fuid distribution. The magnetic feld is due to an electric current produced along the x-axis. Thus the magnetic feld is in yz-plane and F23 is the only non-vanishing component of electromagnetic feld tensor Fij. To obtain the deterministic model in terms of cosmic time t, we assume the condition ζθ =const where ζ is the coefcient of bulk viscosity and θ the expansion in the model. © 2010 Chinese Physical Society and IOP Publishing Ltd.

de Wall H.,Friedrich - Alexander - University, Erlangen - Nuremberg | Pandit M.K.,University of Rajasthan | Chauhan N.K.,Mls University
Precambrian Research | Year: 2012

The Archean-Proterozoic contact (APC) comprises a large scale folded surface around Udaipur in NW India. The APC is exposed on both eastern and western flanks of a synclinorium formed during thick skinned thrusting of the Archean basement and the Paleoproterozoic cover units. Paleosol occurrences on both the limbs of this structure imply an originally continuous paleoweathering horizon and not individual pockets of paleosol as seen today. Preservation of paleosol sections along the Archean-Proterozoic interface in the Aravalli craton is strongly controlled by the structural grain. Complete paleosol sections are recognized in the eastern flank of the Udaipur synclinorium in low strain regions with respect to the regional F1 and F2 folding. In this sector the Tulsi Namla paleosol section represents an ancient lateritic weathering profile with an iron depleted pallid lower zone (lithomarge) and an iron enriched upper zone (mottled zone to ferricrete). Original kaolinite in the saprolite and pallid zone has been transformed into kyanite during metamorphism and subsequently to white mica during retrograde overprint, while Fe rich clay and goethite were probably the primary minerals for the chloritoid and hematite which now constitute the upper zone. At the western flank of the synclinorium the contact is heavily sheared and Archean basement and Proterozoic units show interfingering on a small scale. Here, the paleosol sections are incomplete.The weathering interval can be inferred by the stabilization of the craton at ~2.5. Ga and deposition of rift related sequences of the Aravalli basin (Delwara formation) at ~2.15 Ga. The Udaipur paleosols, especially in the eastern flank, represent the most complete Archean-Paleoproterozoic paleosol sections in India. © 2012 Elsevier B.V.

Galav P.,MLS University | Sharma S.,MLS University | Pandey R.,MLS University
Astrophysics and Space Science | Year: 2012

Response of low latitude ionosphere to the geomagnetic storm of May 30, 2005 in the Indian longitude sector has been investigated by using the GPS data recorded at three stations namely, Udaipur, Hyderabad and Bengaluru. The event is noteworthy due to the fact that the Z component of interplanetary magnetic field (IMF Bz) remained southward for about 10 hours, coincident with the local day time for the Indian longitude sector, along with significantly higher values of AE and ASY-H indices. However, we neither found any evidence for the presence of long lasting storm time electric fields nor could we infer episodes of eastward-westward penetration of electric fields under steady southward IMF Bz and unsteady ring current conditions. On the storm day, the maximum enhancement in the total electron content has been found to be about 60%. The ionosonde observations also showed increased critical frequency (foF 2) and the height (h PF 2) of the F layer. The foF 2 was enhanced by ~60% which is consistent with the enhancement in total electron content. The slow rise and long duration enhancement of h PF 2 and foF 2 have been attributed to the upwelling by the meridional neutral winds, caused by continuous energy inputs at higher latitudes. The poleward expansion of the equatorial ionization anomaly has also been observed on May 30. On May 31, the following day of the storm, significantly suppressed anomaly with near absence of its northern crest in the Indian longitude sector, revealed the effect of storm induced disturbance dynamo electric fields. © 2011 Springer Science+Business Media B.V.

Cadmium, is a highly toxic heavy metal, and is a known carcinogen, clastogen and a mutagen and it poses severe risk to human health. Humans are exposed to cadmium via variable modes i.e. through food and drinking water, by inhalation, cigarette smoking etc. It serves no physiological function within mammalian system. ATSDR (The Agency for Toxic Substances and Disease Registry) has listed cadmium as number 7 in its top 20 list of hazardous substances and International Agency for Research on Cancer (IARC) has classified cadmium as a group 1 carcinogen. In contrast to the activity of cadmium, curcumin the yellow coloured polyphenolic super antioxidant derived from powdered rhizome of Curcuma longa is useful in various debilitating conditions. It is also recommended in cancer prevention and as a treatment adjunct in various diseases. Hence, the aim of the present experimental design was to assess the protective effect of curcumin on cadmium chloride induced genotoxicity in bone marrow chromosomes of Swiss albino mice. In the present experiment four batches of Swiss-albino mice were maintained. The experimental group was administered only single oral dose of cadmium chloride (50mg/kg/animal/day). The subsequent experimental group was administered curcumin (10mg/animal/day) for 15 days and on the 16th day cadmium chloride (50mg/kg/animal/day) was administered. For each experimental group a parallel control group was maintained. Two days after the administration of the last dose, mice were sacrificed and air-dried metaphase preparations were made and subsequently assessed for chromosomal damage. In animals treated with only cadmium chloride there was a significant decline in mitotic index. The aneugenic property of cadmium chloride was distinctly discernible, besides other chromosomal aberrations such as polyploidy terminal deletions and breaks were also observed. In comparison an elevation in mitotic index equivalent to normal group was discerned in animals pre-treated with curcumin and subsequently treated with cadmium chloride and an overall decline in the mutation rate was also discernible clearly indicating the protective effect of curcumin.

Chaudhary B.L.,MLS University | Kumar P.,MLS University
International Journal of Pharma and Bio Sciences | Year: 2011

Epiphytic moss Stereophyllum ligulatum was collected from Maharastra. The plants were extracted in methanol, ethanol, petroleum ether, acetone and benzene. All the crude extracts tested for antibacterial activity against some pathogenic bacteria viz. Bacillus cereus, Staphylococcus aureus, Escherichia coli, Enterobacter aerogenes and Klebsiella pneumoniae by agar well diffusion method. The plant extracts showed remarkable inhibitory activity on the growth of microorganisms. Phytochemical screening was carried out using standard procedure to identify the constituents as described by Sofowora et al. (1998).

Meena P.L.,Mls University | Kumar N.,Mls University | Meena K.S.,Mlv Government College | Jain P.K.,Mlv Government College
Asian Journal of Chemistry | Year: 2012

The term is a energy state, which arises from an approximation treatment of an electronic configuration and term symbol is label to that energy state. The importance of the term symbols have been emphasized in connection with the spectral and magnetic properties of complexes and metal free ions. Russell-Saunders (L-S) coupling and J-J coupling schemes are important schemes for determination of terms and term symbols of the atoms and ions. In this proposed work computation is done for calculating all possible terms for nonequivalent electron of f 2 d 1 configuration without any long tabulation with mental exercise and term symbols are assigned the terms. The possible microstates and spectroscopic terms calculated for f 2 d 1 configuration are 910 and 42 respectively. These terms are quartets (13) and doublets (29).The ground state term for f 2 d 1 is 4K and the ground state is 4K 11/2.

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