Structural and optical properties of TiO₂ thin films derived by sol-gel dip coating process

Saini, K.K.,Sharma, S.D.,Chanderkant,Kar, M.,Singh, D.,Sharma, C.P. North-Holland 2007 Journal of non-crystalline solids Vol.353 No.24

Nanocrystalline thin films of titanium dioxide have been fabricated on glass and silica substrates from partially hydrolyzed precursor solution. These films were subjected to heat treatment for 1h at temperatures 100, 200, 300, 400, 500, 600, 700, 800 and 900<SUP>o</SUP>C and characterized by XRD, SEM, XPS and optical techniques. As deposited films are found to be amorphous and also contain hydroxyl and organic functional groups. Films heat treated above 100<SUP>o</SUP>C do not contain hydroxyl and organic functional groups. Microcrystalline behavior is observed in the films heat treated above 300<SUP>o</SUP>C. Crystallite size increases from ∼5 to 50nm as sintering temperature is increased from 300 to 700<SUP>o</SUP>C. Formation of anatase phase with c-axis length 7.03A is observed in the films annealed up to 700<SUP>o</SUP>C. These films peel off from the substrate beyond 700<SUP>o</SUP>C annealing temperature. Density as well as refractive index of the films increases with increase in annealing temperature up to 700<SUP>o</SUP>C. Refractive index is found to show Cauchys behavior. Transmission better than 70% is observed in the visible range. There is a strong absorption around 370nm, which is attributed to band gap absorption of the material.

Galactic Archeology with the AEGIS Survey: The Evolution of Carbon and Iron in the Galactic Halo

Yoon, Jinmi,Beers, Timothy C.,Dietz, Sarah,Lee, Young Sun,Placco, Vinicius M.,Costa, Gary Da,Keller, Stefan,Owen, Christopher I.,Sharma, Mahavir American Astronomical Society 2018 The Astrophysical journal Vol.861 No.2

<P>Understanding the evolution of carbon and iron in the Milky Way's halo is of importance because these two elements play crucial roles in constraining star formation, Galactic assembly, and chemical evolution in the early universe. Here we explore the spatial distributions of the carbonicity, [C/Fe], and metallicity, [Fe/H], of the halo system based on medium-resolution (R similar to 1300)spectroscopy of similar to 58,000 stars in the southern hemisphere from the AAOmega Evolution of Galactic Structure (AEGIS) survey. The AEGIS carbonicity map exhibits a positive gradient with distance, as similarly found for the Sloan Digital Sky Survey carbonicity map of Lee et al. The metallicity map confirms that [Fe/H] decreases with distance from the inner halo to the outer halo. We also explore the formation and chemical evolution history of the halo by considering the populations of carbon-enhanced metalpoor (CEMP) stars present in the AEGIS sample. The cumulative and differential frequency of CEMP-no stars (as classified by their characteristically lower levels of absolute carbon abundance, A(C) <= 7.1, for subgiants and giants) increases with decreasing metallicity and is substantially higher than previous determinations for CEMP stars as a whole. In contrast, that of CEMP-s stars (with higher A(C)) remains almost flat, at a value of similar to 10% in the range -4.0 less than or similar to [Fe/H] less than or similar to -2.0. The distinctly different behaviors of the CEMP-no and CEMP-s stars relieve the tension with population synthesis models assuming a binary mass-transfer origin, which previously struggled to account for the higher reported frequencies of CEMP stars, taken as a whole, at low metallicity.</P>

Optimization of hemicellulose recovery from black liquor using ZnO/PES ultrafiltration membranes in crossflow mode

Manorma Sharma,Cátia V.T. Mendes,Patrícia Alves,Licínio M. Gando-Ferreira 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

Black liquor, one of the by-products of pulp and paper industry, is an underexplored resource with greatpotential for the recovery of valuable biopolymers such as lignin and hemicelluloses. In this work, thehemicellulose was recovered from this liquor, containing 17 % of total dissolved solids, using ZnO/polyethersulfone ultrafiltration membrane. The hemicellulose was concentrated into the retentatestream while lignin was permeated through these membranes. The effects of transmembrane pressure(1 to 4 bar), time (up to 8 h) and crossflow velocity (0.1 and 0.2 m/s) were studied for ultrafiltration processoperating in crossflow mode. The highest rejection of hemicellulose was achieved up to 90.7 ± 1.9 %at 4 bar. At 3 bar, the yield of hemicellulose was 90 % and 84 % for the volume reduction up to 60 % and78 %, respectively. Mathematical modeling was applied to analyze the membrane fouling mechanismresponsible for the flux reduction during filtration at constant pressure, as well as to predict the changesin hemicellulose and lignin concentration during the filtration process.

Room-temperature relaxor ferroelectricity and photovoltaic effects in tin titanate directly deposited on a silicon substrate

Agarwal, Radhe,Sharma, Yogesh,Chang, Siliang,Pitike, Krishna C.,Sohn, Changhee,Nakhmanson, Serge M.,Takoudis, Christos G.,Lee, Ho Nyung,Tonelli, Rachel,Gardner, Jonathan,Scott, James F.,Katiyar, Ram S American Physical Society 2018 Physical review. B Vol.97 No.5

<P>Tin titanate (SnTiO3) has been notoriously impossible to prepare as a thin-film ferroelectric, probably because high-temperature annealing converts much of the Sn2+ to Sn4+. In the present paper, we show two things: first, perovskite phase SnTiO3 can be prepared by atomic-layer deposition directly onto p-type Si substrates; and second, these films exhibit ferroelectric switching at room temperature, with p-type Si acting as electrodes. X-ray diffraction measurements reveal that the film is single-phase, preferred-orientation ferroelectric perovskite SnTiO3. Our films showed well-saturated, square, and repeatable hysteresis loops of around 3 mu C/cm(2) remnant polarization at room temperature, as detected by out-of-plane polarization versus electric field and field cycling measurements. Furthermore, photovoltaic and photoferroelectricity were found in Pt/SnTiO3/Si/SnTiO3/Pt heterostructures, the properties of which can be tuned through band-gap engineering by strain according to first-principles calculations. This is a lead-free room-temperature ferroelectric oxide of potential device application.</P>

Species Composition and Diversity in Mid-altitudinal Moist Temperate Forests of the Western Himalaya

Sumeet Gairola,C.M. Sharma,Sarvesh Suyal,S.K. Ghildiyal 강원대학교 산림과학연구소 2011 Journal of Forest Science Vol.27 No.1

The present study was undertaken in middle altitudinal (1500 to 2500 masl) moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to assess the variation in species composition and diversity in different vegetation layers viz. herb, shrub and tree, at different altitudes. Shannon-Wiener diversity index ( H ), Nha-1, total basal cover per hectare (G), Simpson concentration of dominance, Pielou Equitability, species richness (SR), Margalef index, Menheink index of species richness and β-diversity were calculated to understand community composition. Tree G ranged from 84.25 to 35.08 m2ha-1 and total stem density varied from 990 to 1470 Nha-1. Total SR (herb, shrub and trees) among different forest types ranged between 31 and 58. Maximum G of herb and shrub layers was recorded at lower altitudes between 1500 and 1650 masl. β-diversity was higher in herb layers as compared to tree and shrub layers. Dominance-diversity curves were also drawn to ascertain resource apportionment among various species in different forest types. Values of species diversity, H, Nha-1 and G were higher in the study area as compared to similar forests growing in other parts of Uttarakhand Himalaya.

Serum Mineral and Haematobiochemical Profile of Microfilariae Infected Cattle in India: Its Effects on Production and Therapy

Sharma, M.C.,Joshi, Chinmay Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.3

A survey was under taken of six district of Northern India viz. Bareilly, Pilibhit, Udham Singh Nagar, Nainital, Almora and Rampur. The age, breed, sex and physiological status recorded. A total number of 854 cattle examined out of which lactating (274 cases), non lactating (302 cases) heifers (128 cases), calves (82 cases) and adult male (68 cases) were examined. An incidence of 4.92 percent (42) of microfilarisis was recorded. The highest prevalence was observed in Rudrapur District of Udham Singh Nagar (33.33%, 4/12), followed by Lalkaun in Nanital District (21.74%, 10/46), Rampur (12.50%, 2/16), Bareilly (8.16%, 8/98) and Pilibhit (1.22%, 1/82). No infection was observed in Almora region. Amongst 854 cattle of different group incidence was highest in adult male (12.20%, 10/82), followed by non lactating (3.82%, 12/314) and lactating (2.70%, 2/74), (7.64%, 12/157) was found in Heifers. For haemeto-biochemical, serum minerals estimations and therapeutic study 32 animals suffering from filariasis and 18 healthy animals were taken. 16 animals were treated with ivermectin $@200{\mu}g/kg $ body weight. Effect of this disease on production has also been estimated for which body weight and milk production was observed. The main clinical manifestations observed were anaemia, loss of appetite, debility, oedematous swelling especially in the abdominal region, increased heart rate, and respiration rate. Haematological changes indicated decrease in hemoglobin, total erythrocyte count, packed cell volume, erthrocyte fragility and neutrophil, whereas there was significant increase in erythrocytes sedimentation rate (ESR), total leukocyte count (TLC), lymphocyte and eosinophils. Biochemical changes showed significant reduction in the values of serum albumin, A : G ratio, where as there was significant increase in blood glucose, blood urea nitrogen (BUN), globulin, total lipid, total cholesterol, phospholipids, serum bilirubin. Serum mineral profile also altered markedly, which indicate a significant decrease in Ca, Cu, Fe, Zn, and Mn with increase value of Na and Cl. There was no significant change in P and K values. Enzyme pattern in micro filaria infected animal indicated increased level of AST, ALT, alkaline phosphatase, ornithine carbamyl transferase, sorbitol dehydrogenase, glutamate dehydrogenase, isocitric dehydrogenase and lactate dehydrogenase. In blood gas values and acid/base balance, there was an increase in $PVCo_2$ and $PVo_2$. It has been observed that microfilaria infected cattle showed decrease in body weight and milk production. Animal treated with ivermectin showed the return of these above values toward normalcy.

Physical Properties of Soils in Relation to Forest Composition in Moist Temperate Valley Slopes of the Central Western Himalaya

Sharma, C.M.,Gairola, Sumeet,Ghildiyal, S.K.,Suyal, Sarvesh Institute of Forest Science 2010 Journal of Forest Science Vol.26 No.2

The present study was undertaken in moist temperate forest of Mandal-Chopta area in the Garhwal region of Uttarakhand, India. The aim of the present study was to assess the physical properties of soils in relation to the forest structure and composition. Twelve forest types according to the altitude, slope aspect and species compositions were selected for the study. Physical properties of soil i.e., soil colour, soil texture (per cent of sand, silt and clay), moisture content, water holding capacity, porosity, bulk density (gm/$cm^3$) and void ratio were analyzed for three different depths viz., (i) 'upper' (0-10 cm), (ii) 'middle' (11-30 cm) and (iii) 'lower' (31-60 cm) in all the selected forest types. Phytosociological and diversity parameters viz. total basal cover ($Gha^{-1}$), stem density ($Nha^{-1}$), tree species richness, Simpson concentration of dominance and Shannon-Wiener diversity index were also calculated for each forest type. This study also provides the comparisons between the results of physical analysis of the present study with numerous other previous studies in the temperate Himalayan region of the Uttarakhand.

Preparation and Application of g-C₃N₄/Co₃O₄ Composite for Photocatalytic Degradation of 4-nitrophenol

M. Y. Shin(신미연),Krishna Prasad Sharma(K. P. Sharma),Ganesh Prasad Awasthi(G. P. Awasthi),C. H. Yu(유창호) Korean Society for Precision Engineering 2024 한국정밀공학회 학술발표대회 논문집 Vol.2024 No.5

Studies on Serum Micro-mineral, Hormone and Vitamin Profile and Its Effect on Production and Therapeutic Management of Buffaloes in Haryana State of India

Sharma, M.C.,Raju, S.,Joshi, C.,Kaur, H.,Varshney, V.P. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.4

A survey was conducted in certain parts of Haryana to record the prevalence of micro mineral deficiency in buffaloes. The prevalence of soil Cu, Co, Zn and Fe deficiency was 55.26%, 6.9%, 59.12% and 7.89% respectively. While that of fodder Cu, Co, Zn and Fe was 60.64%, 6.7%, 61.22% and 11.37% respectively. The overall prevalence of serum Cu, Co, Zn and Fe deficiency in Haryana was 59.2%, 19.1%, 59.2% and 19.9% respectively. The correlation co-efficient of Cu, Co, Zn and Fe in soil, fodder and serum was significant in most of the cases the values were above 0.8. Blood examination revealed significant decrease in haemoglobin and TEC level. However, no variation in level of TLC were observed in mineral deficient buffaloes. In micro mineral deficiency, thyroid hormone (T3 and T4) levels were decreased in buffaloes. Marginally lower concentration of vitamin A and E were observed in mineral deficient buffaloes in Haryana. The highest deficiency of micro minerals was 61.76% in copper at Ambala followed by 65.86% in zinc at Rhotak. For therapeutic studies a mineral mixture was prepared according to defiency obtained and fed to three groups of animals. Observation was recorded on 0, 15, 30, 45 and 60 days. Group A consist of normal healthy animals and group B mineral deficient animal untreated and group C mineral deficient animal, treated with prepared mineral mixture. 25 gram of mineral mixture was fed daily along with normal ration. There was increase in body weight, milk yield, haemoglobin concentration and total erythrocyte level in group C animals when compared to group B animals. The milk yield in group C animals increased to 6.970${\pm}$0.41 after 60th day of supplement in comparison to 0 day where it was 5.910${\pm}$0.37, similarly the body wt. of group C animals increased from 129.42${\pm}$01.13 (at 0 day) to 159.31${\pm}$03.61 at 60th day of treatment.

EFFECT OF LONG TERM SELECTION ON GENETIC PARAMETERS OF ECONOMIC TRAITS IN WHITE LEGHORN

Sharma, D.,Johari, D.C.,Kataria, M.C.,Singh, B.P.,Singh, D.P.,Hazary, R.C. Asian Australasian Association of Animal Productio 1996 Animal Bioscience Vol.9 No.4

The genetic parameters for various economic traits were estimated in a White Leghorn population selected for part period egg production over 16 generations. In early part of selection, egg number had moderate to high heritability (0.26 to 0.51) while age at sexual maturity, egg weight and body weight at 20 and 40 weeks of age had high heritability (0.54 to 0.83). The sire component heritability for all the traits except 20 week body weight declined in later periods of selection. Sex linked gene effects for egg number and age at sexual maturity were more important in early periods of selection in comparison to the later periods, while maternal effects remained important for 20 week body weight in all the periods. Egg number was negatively correlated with egg weight ($r_{G(S)}=-0.36$), age at sexual maturity ($r_{G(S)}=-0.84$) and 40 week body weight ($r_{G(S)}=-0.84$), while it was positively correlated with 20 week body weight ($r_{G(S)}=-0.34$) in base generation. The genetic association between egg number and 40 week body weight changed not only in magnitude but also in direction in later periods. The genetic correlation of egg number with egg weight as well as with age at sexual maturity also decreased in magnitude in later periods of selection.