Ml Sukhadia University
Ml Sukhadia University
Galav K.L.,Bn University |
Maurya V.,Ml Sukhadia University |
Joshi K.B.,Ml Sukhadia University
AIP Conference Proceedings | Year: 2017
The first-principles total energy calculations are coupled with the Murnaghan equation of state to predict lattice constant and the bulk modulus of hypothetical B2 crystal structure of CdNb intermetallic. The calculations for structure determination are performed deploying the linear combination of atomic orbitals method within the framework of density functional theory. After settling the structure, electronic properties such as partial density of states, total density of states, two dimensional electron momentum density etc. are calculated. All electronic properties and the Fermi surface are obtained by applying the linear augmented plane wave method. Features of the Fermi surface are interpreted in terms of bands and the two dimensional electron momentum density distribution. © 2017 Author(s).
Singhal R.K.,University of Rajasthan |
Singhal R.K.,Brazilian Center for Research in Physics (CBPF) |
Kumari P.,University of Rajasthan |
Samariya A.,University of Rajasthan |
And 4 more authors.
Applied Physics Letters | Year: 2010
This article reports on reversible manipulation of room temperature ferromagnetism (RTFM) in nondoped bulk CeO2. The magnetization measurements establish that paramagnetic CeO2 is driven to a ferromagnetic state, without change in structure, when vacuum annealed at 600 °C. The Ce ions transform from 4+ to 3+ state, accompanied by evolution of oxygen vacancies (VO) during the RTFM transition, as determined by x-ray photoemission. The F+ centers (the electrons in singly occupied oxygen vacancies) play key role in the exchange mechanism. The transition shows complete reversibility where the RTFM is removed by removing the vacancies through re-heating the vacuum-annealed CeO2 in air. © 2010 American Institute of Physics.
Jain N.,Ml Sukhadia University |
Goyal S.,Ml Sukhadia University |
Ramawat K.G.,Ml Sukhadia University
International Journal of Pharmacy and Pharmaceutical Sciences | Year: 2011
Childbirth is one of the most precious times in the life of a woman. Ayurveda, the traditional medicinal system of India offers a detailed diet therapy for postpartum healthcare to rejuvenate women's health. This has made the exploration for these traditional medicines and substantiates their traditional use on the ground of modern scientific pharmacological assays. The specific objectives of this study were to identify plant species used in the postpartum healthcare, to determine their total phenolic content, to characterize their antioxidant activities, and to determine if any pharmacological studies have been conducted on these plants which can be related to postpartum disorders. The investigation supports the traditional use of these plants in postpartum care.
Panwar C.,Ml Sukhadia University |
Vyas B.M.,Ml Sukhadia University
AIP Conference Proceedings | Year: 2016
The first ever experimental results over Indian Thar Desert region concerning to height integrated aerosols size distribution function in particles size ranging between 0.09 to 2?μm such as, aerosols columnar size distribution (CSD), effective radius (Reff), integrated content of total aerosols (Nt), columnar content of accumulation and coarse size aerosols particles concentration (Na) (size < 0.5?μm) and (Nc) (size between 0.5 to 2?μm) have been described specifically during winter (a stable weather condition and intense anthropogenic pollution activity period) and pre-monsoon (intense dust storms of natural mineral aerosols as well as unstable atmospheric weather condition period) at Jaisalmer (26.90°N, 69.90°E, 220?m above surface level (asl)) located in central Thar desert vicinity of western Indian site. The CSD and various derived other aerosols size parameters are retrieved from their average spectral characteristics of Aerosol Optical Thickness (AOT) from UV to Infrared wavelength spectrum measured from Multi-Wavelength solar Radiometer (MWR). The natures of CSD are, in general, bio-modal character, instead of uniformly distributed character and power law distributions. The observed primary peaks in CSD plots are seen around about 1013?m2 μm-1 at radius range 0.09-0.20?μm during both the seasons. But, in winter months, secondary peaks of relatively lower CSD values of 1010 to 1011 m2/μm-1 occur within a lower radius size range 0.4 to 0.6?μm. In contrast to this, while in dust dominated and hot season, the dominated secondary maxima of the higher CSD of about 1012?m2μm-3 is found of bigger aerosols size particles in a rage of 0.6 to 1.0?μm which is clearly demonstrating the characteristics of higher aerosols laden of bigger size aerosols in summer months relative to their prevailed lower aerosols loading of smaller size aerosols particles (0.4 to 0.6?μm) in cold months. Several other interesting features of changing nature of monthly spectral AOT, Reff, Nt, Na and NC (particles/m2) have been discussed in detail in this paper. © 2016 Author(s).
Vyas B.M.,Ml Sukhadia University |
Sunda S.,Airports Authority of India
Advances in Space Research | Year: 2012
An annular solar eclipse occurred over the Indian subcontinent during the afternoon hours of January 15, 2010. This event was unique in the sense that solar activity was minimum and the eclipse period coincides with the peak ionization time at the Indian equatorial and low latitudes. The number of GPS receivers situated along the path of solar eclipse were used to investigate the response of total electron content (TEC) under the influence of this solar eclipse. These GPS receivers are part of the Indian Satellite Based Augmentation System (SBAS) named as 'GAGAN' (GPS Aided Geo Augmented Navigation) program. The eight GPS stations located over the wide range of longitudes allows us to differentiate between the various factors induced due to solar eclipse over the equatorial and low latitude ionosphere. The effect of the eclipse was detected in diurnal variations of TEC at all the stations along the eclipse path. The solar eclipse has altered the ionospheric behavior along its path by inducing atmospheric gravity waves, localized counter-electrojet and attenuation of solar radiation intensity. These three factors primarily control the production, loss and transport of plasma over the equatorial and low latitudes. The localized counter-electrojet had inhibited the equatorial ionization anomaly (EIA) in the longitude belt of 72°E-85°E. Thus, there was a negative deviation of the order of 20-40% at the equatorial anomaly stations lying in this 'inhibited EIA region'. The negative deviation of only 10-20% is observed for the stations lying outside the 'inhibited EIA region'. The pre-eclipse effect in the form of early morning enhancement of TEC associated with atmospheric gravity waves was also observed during this solar eclipse. More clear and distinctive spatial and temporal variations of TEC were detected along the individual satellite passes. It is also observed that TEC starts responding to the eclipse after 30 min from start of eclipse and the delay of the maximum TEC deviation from normal trend with respect to the maximum phase of the eclipse was close to one hour in the solar eclipse path. © 2011 COSPAR. Published by Elsevier Ltd. All rights reserved.
Dashora A.,University of Mumbai |
Patel N.,University of Trento |
Kothari D.C.,University of Mumbai |
Ahuja B.L.,Ml Sukhadia University |
Miotello A.,University of Trento
Solar Energy Materials and Solar Cells | Year: 2014
First principles calculations are performed to study the electronic and optical properties of Cu-doped, N-doped and (Cu+2N)-co-doped anatase TiO 2. Strong hybridization between Cu 3d and N 2p orbitals above the valence band leads to the formation of an isolated intermediate band (IB) deep in the band gap of pure TiO2. The new energetic features, predicted by DFT, have been experimentally confirmed using UV-vis-NIR spectroscopy. In particular, the diffuse reflectance spectrum of the co-doped TiO2 sample shows the presence of two edges which confirm the existence of IB in the band gap. This IB in the band gap of TiO2 is responsible for high visible light absorption through a two-step optical transition between valence and conduction bands via the IB. In mono-doped samples, only a reduction of the band gap is observed which is consistent with the first-principles calculations. X-ray photoelectron spectroscopy of mono- and co-doped TiO2 samples establishes the chemical states of several atomic elements and especially clarifies the key presence of O-vacancies leading to a new position of conduction band minima. The presence of broad IB and the absence of dopant energy levels close to the conduction band minimum in (Cu+2N)-co-doped TiO 2 qualify it to be an efficient material for photovoltaic conversion, photocatalytic water splitting, and photocatalytic degradation of pollutants. © 2014 Elsevier B.V.
Bhatnagar P.,Ml Sukhadia University |
Pareek N.,Ml Sukhadia University
Journal of Information Science | Year: 2014
Pseudo relevance feedback-based query expansion is a popular automatic query expansion technique. However, a survey of work done in the area shows that it has a mixed chance of success. This paper captures the limitations of pseudo relevance feedback (PRF)-based query expansion and proposes a method of enhancing its performance by hybridizing corpus-based information, with a genetic fuzzy approach and semantic similarity notion. First the paper suggests use of a genetic fuzzy approach to select an optimal combination of query terms from a pool of terms obtained using PRF-based query expansion. The query terms obtained are further ranked on the basis of semantic similarity with original query terms. The experiments were performed on CISI collection, a benchmark dataset for information retrieval. It was found that the results were better in both terms of recall and precision. The main observation is that the hybridization of various techniques of query expansion in an intelligent way allows us to incorporate the good features of all of them. As this is a preliminary attempt in this direction, there is a large scope for enhancing these techniques. © The Author(s) 2014.
Paliwal U.,Ml Sukhadia University |
Kothari R.K.,Government College |
Joshi K.B.,Ml Sukhadia University
Superlattices and Microstructures | Year: 2012
The electronic, optical and structural properties of Zn xCd 1-xS ySe 1-y quaternary alloys lattice matched to GaAs and InP are studied. The electronic band structure and density of states are computed using empirical pseudopotential method. The disorder effects are included via modified virtual crystal approximation. The bandgap computed from band structures are utilized to evaluate refractive indices, dielectric constants and ionicity factors for the alloys. Among structural properties elastic constants and bulk moduli are computed by combining the EPM with Harrison bond orbital model. All possible semiconductors from the ZnCdSSe system are found to have direct bandgap. The lattice matched alloys have larger band gap and more ionic character than the lattice matched compounds. © 2012 Elsevier Ltd. All rights reserved.
Kachhara R.P.,Ml Sukhadia University |
Jodhawat R.L.,Ml Sukhadia University |
Bigyapati Devi K.,Ml Sukhadia University
Journal of Earth System Science | Year: 2012
Marine Oligocene sequences in India outcrop only in western part of Kachchh. Earlier researchers have recognized the Oligocene strata under the Nari Series (Nagappa 1959; Chatterji and Mathur 1966). The Nari Series has a type area in Pakistan. It has two subdivisions-the Lower Nari (Lower Oligocene) and the Upper Nari (Upper Oligocene). It seems that there is no valid proof about the age of the Lower Nari due to lack of proper fauna (Eames 1975), and according to Pascoe (1962), the Upper Nari slightly transgress into Aquitanian (Lower Miocene), therefore, one has to be very cautious. Biswas and Raju (1971) reclassified the Oligocene strata of Kachchh and lithostratigraphically clubbed them as the Maniyara Fort Formation with type section along the Bermoti stream. This Formation has four members. The lower three members correspond to the Ramanian Stage (Lower Oligocene, Biswas 1971, 1973) while the uppermost to the Waiorian Stage (Upper Oligocene, Biswas 1965, 1971, 1973). The Ramanian Stage is characterized by large forams especially Nummulites fichteli, Nummulites fichteli intermedius, Lepidocyclina (Eulepidina) dialata and Operculina sp. Several ostracods are also known to occur. Megafauna include bivalves, gastropods, echinoids, corals, mammals and reptiles. Concerning bivalves earlier researchers have recorded a few taxa namely Trisidos semitorta (Lamarck), Cubitostrea angulata (J de C Sowerby), Pecten (Amussiopecten) labadyei d'Archiac and Haime, Periglypta puerpera (Linne') var. aglaurae Brongniart, Ostrea fraasi Mayer Eymer and listed Pecten laevicostatus J de C Sowerby, Callista pseudoumbonella Vredenburg and Clementia papyracea (Gray) from Kachchh as against overall 42 forms from the Nari Series as a whole (Vredenburg 1928). This tempted us to make an attempt to collect bivalve fauna systematically which are occurring prolifically in the Ramanian Stage. In the present work, for this purpose, sections are worked out around Lakhpat (23 °50′N; 68 °47′E), Maniyara Fort (23 °28′05″N; 68 °37′E) Rakhdi Dam (23 °27′26″N; 68 °40′10″E) and Waior (23 °25′05″N; 68 °41′37″E) with a view to highlight the entombed bivalve taxa. Authors have encountered 53 species of which 23 are restricted to the Ramanian Stage. © Indian Academy of Sciences.
Arora J.,Ml Sukhadia University
Biofuels | Year: 2013
The Thar Desert is one of the most populated deserts in the world, with a very high cattle population. The rural population is mainly dependent on fuelwood for cooking, as other sources of energy are either not available or not affordable. The population, cattle and energy requirements generate tremendous pressure on biofuel plants such as Prosopis juliflora, Acacia nilotica, Leptadenia pyrotechnica, Calligonum polygonoides, Calotropis procera and Zizyphus species. Biodiesel production from Jatropha curcas is another renewable energy source, having socioeconomic implications in rural areas with an estimated annual production potential of 200,000 metric tons of seeds in India. Bioenergy resources of the Thar Desert's arid region are presented in this review. This overview presents the biology, biotechnology and current status of various bioenergy resources (plants) of the Thar Desert and some of the future directions for these plants, which will make a profound impact on bioenergy industries as well as the socioeconomic level of the rural population. When the diesel prices will be left to market forces and biodiesel technology will be perfected for 20% blending in 2017, how this scenario will change is also presented. © 2013 Future Science Ltd.