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Chandrapur, India

Manik U.,Sardar Patel Mahavidyalaya | Gedam S.C.,Kzs Science College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Luminescence | Year: 2015

The KNaSO4 microphosphor doped with Ce or Ce and Dy prepared by a wet chemical method was studied by scanning electron microscopy (SEM) and characterized by photoluminescence (PL). KNaSO4 has a 5-μm particle size detected by SEM. The KNaSO4:Ce3+ spectrum shows a single emission band at 327 nm for an excitation of 269 nm due to 5d → 4f transition of the Ce3+ ion, indicating weak spin orbiting coupling of the Ce3+ ground state. Efficient energy transfer takes place from Ce3+ → Dy3+ sublattices indicating that Ce3+ could effectively sensitize Dy3+ (orange emission) and that the Ce3+ emission weakens significantly in KNaSO4. The powder form of prepared KNaSO4 show negligible change in morphologies and hence no effect on the particle size. The characteristics of this powder could provide improved luminescence properties. The development and understanding of this photoluminescence and the effect of Dy3+ on KNaSO4: Ce3+ are discussed. Copyright © 2014 John Wiley & Sons, Ltd. Source


Kamble R.K.,Sardar Patel Mahavidyalaya
Indian Journal of Environmental Protection | Year: 2012

Mixing heights observations were recorded in Dehra village by using minisonde technique in summer season for 3 day at an interval of 3 hr so as to have a clear idea of diurnal variation of mixing heights from the study area. The results depicts that maximum mixing height from the study area was 1650 m above ground level in afternoon (2.30 pm), while diurnal variation indicated ground based inversion upto a height of about 300 m above ground level, that is nil mixing height during late night (2.30 am) and early morning (5.30 am) hours. The diurnal variation of mixing height was in accordance with incoming solar radiation, as the day progresses so the mixing height and vice versa. The maximum mixing height of 1650 m above ground level indicated the volume available for dilution, dispersion and transportation of air pollutants in the lower atmosphere which are emitted by anthropogenic and industrial activities, thus reducing the chances of air pollution episodes in the study area. © 2012 - Kalpana Corporation. Source


Kamble R.K.,Sardar Patel Mahavidyalaya
Indian Journal of Environmental Protection | Year: 2012

The ambient air sampling was carried out in 9 locations distributed in upwind and downwind direction of Chandrapur industrial cluster region comprises of MIDC Chandrapur, Ghugus, MIDC Tadali and Ballarpur area for dust fall rate and sulphation rate during December 2011. Dust fall rate was estimated by gravimetric method and sulphation rate by lead peroxide candle method. For both parameters sampling period was 30 day. The results indicated that dust fall rate in the study area was higher as compared with non industrial area. Maximum dust fall rate was recorded in Dadmahal ward 218.92 MT/km2/month, followed by Padoli, Nakoda and Ghugus; whereas minimum was observed in Visapur 13.49 MT/km2/month. The sulphation rate in the study area was found to be minimum of 0.0686 mg SO3/100 cm2/day in Pathanpura, whereas maximum in Nakoda 1.234 mg SO3/100 cm2/ day. The sulphation rate in Babupeath the background concentration sampling site was found to be 0.137 mg SO3/100 cm2/day. Form the result it is evident that dust fall rate and sulphation rate was higher in downwind direction as compared with upwind. © 2012 - Kalpana Corporation. Source


Manik U.,Sardar Patel Mahavidyalaya | Gedam S.C.,Kzs Science College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2013

The phase formation of the compound Na2Mg(SO4) 2 prepared by a wet chemical method was confirmed by the X-ray powder diffraction (XRD) pattern. Photoluminescence (PL) of Na2Mg(SO 4)2: Ce3+ shows strong emission at 322 nm, and this phosphor is also efficient for Ce3+→ Dy3+ and Ce3+→ Mn2+ energy transfers. The Dy3+ emission by Ce3+→ Dy3+ under UV wavelength is peaking at 475 nm and 572 nm for an excitation of 254 nm due to 4F 9/2 →6H15/2 and 6H 13/2 transitions, whereas Ce3+→Mn2+ is peaking at 515 nm due to 4T1→6A 1 transitions. The Tb3+ emission by Ce3+→ Tb3+ under UV wavelength is peaking at 490, 529, 546 nm, (with a small peak at 586 nm) for the excitation of 352 nm due to 5D 4→7FJ (J=4, 5, 6) transitions. The purpose of the present study is to develop and understand the photoluminescence and effect of Dy3+, Mn2+ or Tb3+ co-doping in Na2Mg(SO4)2:Ce3+ new luminescent materials, which can be the green phosphor in many applications such as lamp phosphors. © 2012 Elsevier B.V. Source


Kamble R.K.,Sardar Patel Mahavidyalaya | Babyrani Devi S.,Devi Ahilya University
Indian Journal of Environmental Protection | Year: 2010

Rapid industrialization and urbanization has accelerated the growth of cities which has lead to rapid migration of human being towards cities. The infrastructure required to sustain human needs, such as houses and roads has contributed significant change in landscape of cities. Due to city geometry (canyon) and anthropogenic activities an increase in ambient air temperature of city as compared to surrounding rural areas has been observed; by forming an urban heat island (UHI) in cities. The review describes UHI, its causes, consequences and mitigation measures. © 2010 - Kalpana Corporation. Source

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