Hierarchical K/LTL zeolites: Synthesis by alkali treatment, characterization and catalytic performance in Knoevenagel condensation reaction

Nilesh P. Tangale,Shilpa K. Sonar,Prashant S. Niphadkar,Praphulla N. Joshi 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-

The hierarchical K/LTL zeolites prepared by post-synthesis modification with aqueous 1.5 M KOHsolution by varying alkali volume to K/LTL zeolite (10–70 ml/g) ratios, were examined in Knoevenagelcondensation. The physico-chemical properties of the catalysts were thoroughly evaluated by PXRD,FTIR, ICP, CO2-TPD, XPS, N2 adsorption/desorption and 29Si and 27Al MAS-NMR. Among all the samples,hierarchical K/LTL prepared by treating K/LTL with 50 ml aqueous 1.5 M KOH solution per gram of K/LTLdisplayed about 1.5 fold higher catalytic activity as compared to parent K/LTL, presumably because ofcombined effect of enhanced basicity and molecular diffusion through pore channels.

Measurement of the branching fractions forB0→Ds*+π−andB0→Ds*−K+decays

Joshi, N. J.,Aziz, T.,Trabelsi, K.,Adachi, I.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Bakich, A. M.,Balagura, V.,Barberio, E.,Bay, A.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,Bondar, A.,Boz American Physical Society 2010 PHYSICAL REVIEW D - Vol.81 No.3

Charge transport studies on chemically grown manganite based heterostructures

Keval Gadani,Khushal Sagapariya,K.N. Rathod,Hetal Boricha,Bhargav Rajyaguru,V.G. Shrimali,A.D. Joshi,K. Asokan,N.A. Shah,P.S. Solanki 한국물리학회 2019 Current Applied Physics Vol.19 No.4

In this communication, we have successfully fabricated mixed valent La0.7Ca0.3MnO3 (LCMO) manganite based (i) ZnO/LCMO/LAO and (ii) LMO/LCMO/LAO (LMO: LaMnO3–d thin layer; LAO: LaAlO3 substrate) thin film heterostructures using chemical solution deposition (CSD) method. 100 nm LCMO layer was initially grown on single crystalline (100) LAO substrate followed by the growth of 50 nm ZnO and LMO layers separately on the two different heterostructures. In the present study, upper layers of ZnO and LMO were intentionally prepared at 700 °C for 12 h under air environment, thereby some naturally created oxygen vacancies are expected to be present in their lattices. Presence of oxygen vacancies makes ZnO and LMO layers as n–type oxides in the heterostructures. Temperature dependent current–voltage (I–V) characteristics and interface resistivity (under different applied electric fields across interface only) were carried out to understand their charge transport behavior. A strong effect of electric field on the resistivity behavior has been observed due to a reasonable electrically polarizable (active) nature of ZnO and LMO thin layers. Zener double exchange (ZDE) polynomial law has been employed to understand various scattering processes as source of resistivity across, both, ZnO/ LCMO and LMO/LCMO interfaces. Transport properties and charge conduction mechanisms have been discussed and compared for both the interfaces in the context of interface state and barrier between electrically active layer and LCMO film. Also, power consumption criteria have been discussed in detail for the presently studied heterostructures for their practical device applications such as field effect devices, memory devices, read–write head devices or any other spintronic devices.

FRACTIONAL CALCULUS OPERATORS APPLIED TO THE FUNCTION INVOLVING THE PRODUCT OF SRIVASTAVA POLYNOMIALS AND INCOMPLETE I-FUNCTIONS

N.K. JANGID,S. JOSHI,K. JANGID,S. ARACI,S.D. PUROHIT 장전수학회 2021 Advanced Studies in Contemporary Mathematics Vol.31 No.2

In this study, we investigate the Marichev-Saigo-Maeda fractional order differentiation and integral for the function pertaining the product of Srivastava polynomials and incomplete I-functions. More- over, their special cases are also depicted in terms of the corollaries associated with Saigo, Riemann-Liouville, and Erdelyi-Kober fractional operators.

Probing charge transport in manganite film through switching parameters

Rathod K.N.,Boricha Hetal,Sagapariya Khushal,Hirpara Bharavi,Dhruv Davit,Joshi A.D.,Pandya D.D.,Singh J.P.,Chae K. H.,Asokan K.,Solanki P.S.,Shah N.A. 한국물리학회 2021 Current Applied Physics Vol.28 No.-

We have investigated the bipolar resistive switching of Y0.95Ca0.05MnO3 (YCMO) thin film on Si substrate using pulsed laser deposition. Simulation of Mn L3,2 near-edge X-ray absorption fine structure has been executed by CTM4XAS to corroborate the presence of a mixed-valence state of Mn ions and oxygen vacancies. The charge transport in the film is described by the space charge limited mechanism. Murgatroyd and space charge limited mechanism relations are used to calculate the mobility and other switching parameters at high resistance state. With a decrease in the switching layer (near to positively biased electrode) thickness, better resistive switching was observed. This work indicates that the localized switching thickness and temperature strongly affect the resistive switching of the YCMO film.

Respiratory symptoms and illnesses related to the concentration of airborne particulate matter mong brick kiln workers in Kathmandu valley, Nepal

Seshananda Sanjel,Sanjay N. Khanal,Steven M. Thygerson,William S. Carter,James D. Johnston,Sunil K. Joshi 대한직업환경의학회 2017 대한직업환경의학회지 Vol.29 No.-

Background: Bricks have been manufactured in Nepal for hundreds of years and are seen as a component of Nepalese sculpture and architecture. Large quantities of hazardous materials including high concentrations of particulate matter are emitted on a daily basis from brick kilns. Exposure to these hazardous materials can lead to adverse consequences on the environment and human health. This study was conducted to estimate the prevalence of respiratory symptoms/illnesses and the magnitude of respirable and total dust exposures among Nepalese brick kiln workers. Methods: Respiratory symptoms/illnesses were evaluated by questionnaire among brickfield workers (n = 400) and a referent group of grocery workers (n = 400) in Kathmandu valley. Work zones (WZs): green brick molding (GBM), green brick stacking/carrying (GBS/C), red brick loading/carrying (RBL/C), coal preparation (CP) and firemen (FM) were the similar exposure groups (SEGs) from where personal air samples and interviews were taken. Among brickfield workers, personal monitoring was conducted across SEGs for total (n = 89) and respirable (n = 72) dust during February–March 2015 and March–April 2016. Applying multi-stage probability proportionate to size sampling technique, 16 kilns and 400 brick workers for interview were selected. Proportions, means, medians and ranges were calculated for the demographics, samples and respiratory symptoms/illnesses. One-way ANOVA was applied to compare the significance differences of the level of particulate matter among SEGs. Bivariate and multivariate logistic regression analysis were performed to evaluate association between respiratory symptoms/illnesses and participants groups, and SEGs among brick kiln workers at 0.05 level. Statistical analyses were performed using IBM SPSS Statistics 21. Results: Chronic cough (14.3%), phlegm (16.6%) and bronchitis (19.0%) were higher (P < 0.05) among brickfield compared with grocery workers (6.8, 5.8 and 10.8%). Mean respirable (5.888 mg/m<SUP>3</SUP>) and total (20.657 mg/m<SUP>3</SUP>) dust exposures were highest for red brick loading tasks. The prevalence of chronic cough, chronic phlegm, chronic bronchitis, wheezing and asthma were significantly higher for other WZs workers (p < 0.05) compared with CP; for GBM: 22.9, 34.6, 15.0 and 7.5%; for GBS/C: 13.5, 15.8, 10.0, 8.8 and 7.5%; for RBL/C: 11.1, 17.1, 27.4, 19.0 and 11.9%; for FM: 18.4, 12.5, 28.4, 4.9 and 0.0%; and for CP: 4.9, 6.3, 13.3, 9.3 and 4.0% respectively. Conclusion: High dust exposures identified in this study may explain the increased prevalence of respiratory symptoms/illnesses among Nepalese brickfield workers, warranting action to reduce exposures.

Respiratory symptoms and illnesses related to the concentration of airborne particulate matter among brick kiln workers in Kathmandu valley, Nepal

Seshananda Sanjel,Sanjay N. Khanal,Steven M. Thygerson,William S. Carter,James D. Johnston,Sunil K. Joshi 대한직업환경의학회 2017 대한직업환경의학회지 Vol.29 No.-

Background: Bricks have been manufactured in Nepal for hundreds of years and are seen as a component of Nepalese sculpture and architecture. Large quantities of hazardous materials including high concentrations of particulate matter are emitted on a daily basis from brick kilns. Exposure to these hazardous materials can lead to adverse consequences on the environment and human health. This study was conducted to estimate the prevalence of respiratory symptoms/illnesses and the magnitude of respirable and total dust exposures among Nepalese brick kiln workers. Methods: Respiratory symptoms/illnesses were evaluated by questionnaire among brickfield workers (n = 400) and a referent group of grocery workers (n = 400) in Kathmandu valley. Work zones (WZs): green brick molding (GBM), green brick stacking/carrying (GBS/C), red brick loading/carrying (RBL/C), coal preparation (CP) and firemen (FM) were the similar exposure groups (SEGs) from where personal air samples and interviews were taken. Among brickfield workers, personal monitoring was conducted across SEGs for total (n = 89) and respirable (n = 72) dust during February–March 2015 and March–April 2016. Applying multi-stage probability proportionate to size sampling technique, 16 kilns and 400 brick workers for interview were selected. Proportions, means, medians and ranges were calculated for the demographics, samples and respiratory symptoms/illnesses. One-way ANOVA was applied to compare the significance differences of the level of particulate matter among SEGs. Bivariate and multivariate logistic regression analysis were performed to evaluate association between respiratory symptoms/illnesses and participants groups, and SEGs among brick kiln workers at 0.05 level. Statistical analyses were performed using IBM SPSS Statistics 21. Results: Chronic cough (14.3%), phlegm (16.6%) and bronchitis (19.0%) were higher (P < 0.05) among brickfield compared with grocery workers (6.8, 5.8 and 10.8%). Mean respirable (5.888 mg/m3) and total (20.657 mg/m3) dust exposures were highest for red brick loading tasks. The prevalence of chronic cough, chronic phlegm, chronic bronchitis, wheezing and asthma were significantly higher for other WZs workers (p < 0.05) compared with CP; for GBM: 22.9, 34.6, 15.0 and 7.5%; for GBS/C: 13.5, 15.8, 10.0, 8.8 and 7.5%; for RBL/C: 11.1, 17.1, 27.4, 19.0 and 11.9%; for FM: 18.4, 12.5, 28.4, 4.9 and 0.0%; and for CP: 4.9, 6.3, 13.3, 9.3 and 4.0% respectively. Conclusion: High dust exposures identified in this study may explain the increased prevalence of respiratory symptoms/ illnesses among Nepalese brickfield workers, warranting action to reduce exposures.

Cytokine expression pattern in milk somatic cells of subclinical mastitis-affected cattle analyzed by real time PCR

Bhatt, Vaibhav D.,Khade, Prasad S.,Tarate, Sagar B.,Tripathi, Ajai K.,Nauriyal, Dev S.,Rank, Dharamshi N.,Kunjadia, Anju P.,Joshi, Chaitanya G. The Korean Society of Veterinary Science 2012 大韓獸醫學會誌 Vol.52 No.4

The expression profiles of inflammatory cytokines viz. interleukins (IL)-6, IL-8, IL-12, granulocyte macrophage-colony stimulating factor, interferon-${\gamma}$ and tumor necrosis factor-${\alpha}$ in response to subclinical mastitis in indigenous cattle breed Kankrej (n = 6), Gir (Bos indicus) (n = 12) and crossbred (Bos taurus${\times}$Bos indicus) (n = 7) were investigated using quantitative real time PCR. Significant correlation (p < 0.05) was observed between total bacterial load and somatic cell count (SCC) in all three breeds of cattle. All the cytokines were observed to be up-regulated compared to cows with healthy quarters, however, level of their expression varied among three breeds of cattle. In Kankrej most cytokines were found to be transcribed to higher levels than in other two breeds; the milk had higher load of bacteria but not so high SCC, implying that Kankrej has a higher inherent resistance against mastitis. The results of present study indicated that mammary glands of crossbred cattle are more sensitive to bacterial infection than indigenous breed of cattle as they elicit immune response at lower bacterial load and result into higher SCC. Research on identification of factors responsible for differentially expressed cytokines profiles and use of cytokines as immunomodulatory tools can pave way for formulating control strategies against bovine mastitis.

In-situ deposition of silver-iron oxide nanoparticles on the surface of fly ash for water purification

Joshi, M.K.,Pant, H.R.,Liao, N.,Kim, J.H.,Kim, H.J.,Park, C.H.,Kim, C.S. Academic Press 2015 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.453 No.-

In this study, a fly ash based composite, Ag-iron oxide/fly ash, was synthesized via a facile one-pot hydrothermal process using fly ash, ferrous chloride, and silver nitrate as precursors. Field emission scanning electron microscopy (FE-SEM), EDX, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infra-red spectroscopy (FTIR), Photoluminescence (PL) and Brunauer-Emmett-Teller (BET) surface area measurement confirmed the formation of composite particle. FA provided a suitable surface for the in-situ deposition of Fe<SUB>3</SUB>O<SUB>4</SUB> and Ag NPs during hydrothermal treatment. As a result, the particle size of Fe<SUB>3</SUB>O<SUB>4</SUB> and Ag NPs was sufficiently decreased, and the surface area of the NPs as well as, a whole matrix was increased. The antimicrobial activity of the composite was accessed by Escherichia coli inhibition assay. Lead(II) ion adsorption efficiency of the composite was analyzed from a series of batch adsorption experiments (the effects of concentration, contact time, pH and adsorbent dose on the adsorption of Pb(II) ion from aqueous solution). Results indicated that as-synthesized composite has high antibacterial capacity, and the metal ions uptake efficiency compared to fly ash particle. Furthermore, incorporation Fe<SUB>3</SUB>O<SUB>4</SUB> NPs onto the fly ash make it easily separable from a reaction system using an external magnet. The composite synthesis protocol is a simple method that utilizes a readily available industrial byproduct to produce a unique composite for environmental remediation.

Electrospun bioactive poly (@?-caprolactone)-cellulose acetate-dextran antibacterial composite mats for wound dressing applications

Liao, N.,Unnithan, A.R.,Joshi, M.K.,Tiwari, A.P.,Hong, S.T.,Park, C.H.,Kim, C.S. Elsevier 2015 Colloids and surfaces. A, Physicochemical and engi Vol.469 No.-

<P>Electrospun nanofibrous mat for wound dressing application was successfully prepared from poly (6caprolactone) (PCL), cellulose acetate (CA) and dextran blend solution. Incorporation of small amount of tetracycline hydrochloride (TCH), an antibacterial drug, improved the cell proliferation, enhanced blood clotting ability and cell attachment as well as antimicrobial activity of the composite mat. The composite mats were characterized by SEM, FTIR and TGA analysis. In order to evaluate the cytocompatibility and cell behavior of the composite scaffolds, fibroblast cells were seeded on the matrix. Results demonstrated that the incorporation of dextran and drug strongly enhanced the adhesion and proliferation of the cells on the composite nanofibers. The antimicrobial activity of the composite was studied by zone inhibition against Gram-positive and Gram-negative bacteria and the result indicates high antibacterial activity. Therefore, as synthesized composite fiber have decent characteristics for wound dressing and skin engineering applications. (C) 2015 Elsevier B.V. All rights reserved.</P>