Final report on APMP supplementary comparison P1-APMP.EM.RF-S3: APMP comparison of 50 ohm coaxial mismatches

Patel, Kamlesh,Negi, P S,Swarup, Ram,Kim, Jeong Hwan,Kang, Jin-Seob,Chow, Michael W K,Tsui, C M,Dressler, Erik,Shay, Wen-Tron,Li, Hua,Shan, Yueyan Springer-Verlag 2012 METROLOGIA -BERLIN- Vol.49 No.-

<P>A measurement comparison of complex reflection coefficient has been carried out among six national metrology laboratories in coaxial system at frequencies of 50 MHz, 2 GHz, 10 GHz and 18 GHz. Three 50 Ω coaxial mismatches (voltage standing wave ratios 1.2, 1.5 and 2.0) in 7 mm connectors have been measured for their complex reflection coefficients in the magnitude and phase form. The six laboratories participated are NPL India, KRISS Korea, SCL Hong Kong, CMS ITRI Taiwan, NMC Singapore and CSIR-NML South Africa (now NMISA). The National Physical Laboratory (India) acted as the pilot laboratory for the comparison. Good agreement between the values provided by the participating laboratories has been observed: the degrees of equivalence for all the values reported, with respect to the reference value and between pairs of laboratories, are less than their associated uncertainties, at a level of confidence of 95%.</P><P>Main text.To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.</P><P>The final report has been peer-reviewed and approved for publication by APMP, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>

Magnetic Behaviour of Granular GdMnO3 Film

Negi, P.,Agrawal, H. M.,Singh, J. P.,Kumar, H.,Srivastava, R. C.,Asokan, K.,Chae, K. H. Springer Science + Business Media 2017 Journal of superconductivity and novel magnetism Vol.30 No.6

<P>The present study deals with the investigation of magnetic properties along with morphological and microstructure analyses of a multiferroic GdMnO3 film fabricated on Si(100) substrate by the pulsed laser deposition technique. Rutherford backscattering spectroscopic analysis suggests that the film is fabricated in the form of diffused layers having different stoichiometric proportions. Raman spectroscopy signifies that few modes present in the film are associated with MnO6 octahedra and some extra peaks indicating the mixed phase formation in tuning with the Rutherford backscattering spectroscopy. Atomic force microscopy confirms the granular nature of the film. Field-cooled and zero-field-cooled thermal magnetization curves show irreversible behaviour extending well above room temperature, which is associated with spin disorder. The presence of Gd+3 state and Mn+3/Mn+4 mixed states in the uppermost layers of the film was confirmed by near-edge X-ray absorption fine structure. Subsequently, in association with these observations, the film is a weak ferromagnetic at 5 K and even at room temperature.</P>

“Neither it had social work components nor experiential”: Students' perspectives of online fieldwork practice during COVID ‐19 in India

Negi Dandub Palzor,E P Abdul Azeez 한국사회복지학회 2022 Asian Social Work and Policy Review Vol.16 No.3

This paper explores social work students' perspectives of online fieldwork practice that emerged due to sudden disruption in field placement as a result of the outbreak of COVID-19 in India. We have recruited and interviewed 32 Master's students from five north-Indian universities to participate in the research. The study's findings highlight ill-equipped agencies lacking social work components in online/virtual field placement. Also, ethical dilemmas in working virtually, disconnectedness from the field, and superficial supervision were experienced by the students. The study result implies the urgent need to develop and innovate a pedagogical approach to deal with uncertainties and crises like the COVID-19.

Antibacterial Activity of Aristolochia bracteata Root Extracts

G.K. Jayaprakasha,P.S. Negi,C. Anandharamakrishnan 한국식품영양과학회 2003 Journal of medicinal food Vol.6 No.4

Aristolochia bracteata(Aristolochiaceae) is used in traditional medicines as a gastric stimulant and in the treat-ment of cancer, lung inflammation, and dysentery and snake bites. The present investigation was undertaken to evaluate theantibacterial activity of Aristolochia bracteataroot extracts. Roots of A. bracteatawere powdered and successively extractedwith ethyl acetate, acetone, methanol, and water for 8 hours each using a Soxhlet extractor. Antibacterial activity of dried ex-tracts was evaluated by the pour-plate method against a few Gram-positive and Gram-negative bacteria. All the crude extractsshowed a broad spectrum of antibacterial activity. The ethyl acetate extract was found to be the most effective. This studyshows the potential for replacement of synthetic preservatives by the use of natural extracts.

Consequences of electronic excitations in CoFe_1.90Dy_0.10O₄

Kumar, H.,Singh, J.P.,Srivastava, R.C.,Negi, P.,Agrawal, H.M.,Asokan, K.,Won, S.O.,Chae, K.H. Elsevier 2015 CURRENT APPLIED PHYSICS Vol.15 No.12

Present work reports the irradiation induced effects in Dy<SUP>3+</SUP> doped cobalt ferrite nanoparticles in the regime of dominant electronic excitation processes induced by 100 MeV O<SUP>7+</SUP> ion irradiation. Irradiation leads to the deterioration of crystalline phase as envisaged by X-ray diffraction. Crystallite size decreases with the increase of irradiation fluence. Disappearance of certain bands in Raman spectra at higher fluence of irradiation confirms the crystalline disorder induced by electronic excitations. Fourier transform infrared spectra show onset of cation migration from tetrahedral site to octahedral site and vice versa. X-ray absorption fine structure measurements depict the preservation of valence state of metal ions after irradiation. These measurements further infer bond breaking process in irradiated materials. Magnetic measurements carried out on these materials indicate slight increase of saturation magnetization at room temperature followed by the decrease of coercive field. Obtained results are discussed on the basis of appropriate mechanism.

Leucaena Seeds as Protein Supplement in the Rations of Growing Sheep

Singh, Sultan,Kundu, S.S.,Negi, A.S.,Gupta, S.K.,Singh, N.P.,Pachouri, V.C. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.10

The study was carried out to evaluate leucaena seeds as a protein replacement of mustard seed cake (MSC) in the concentrate mixture of growing lambs. Fifteen owing male lambs (Local${\times}$Corridale) with an average body weight of 16.3 kg were allocated into three dietary treatments (T1, T2, and T3) with five animals in each group. Animals were offered dry mixed grass, berseem hay and concentrate mixture to meet their nutrient requirements. In concentrate mixture of T1, (Control) MSC was used as protein source, while in T2 and T3 groups, 25 and 50% of MSC was replaced by leucaena leucocephala seeds. On completion of three months (90 days) of feeding, a digestion cum-metabolism trial was conducted to determine DMI, nutrient utilization, and nitrogen balance. Changes in body weight were recorded at 15 day internals and eating patterns were recorded for 3 consecutive days at the end of the feeding trial. MSC had higher CP contents than leucaena seeds (27.0%). Mimosine contents in leucaena seeds were 1.1 compared to 0.2 and 0.4% in concentrate mixture of T2 and T3 group, respectively. Dry matter intake varied non-significantly ($79.3{\pm}1.2$ to $83.4{\pm}1.3g/kg$ $w^{0.75}$) across the dietary treatments. Digestibility of DM and cell wall polysaccharides (NDF, ADF. Cellulose and hemicellulose) were comparable, however CP digestibility was relatively lower in leucaena luecocephala seeds based groups (T2 $45.5{\pm}1.7$ and T3 $46.7{\pm}3.5$) compared to MSC supplemented group (T1 $47.7{\pm}0.9%$). The growth rate of lambs was non-significantly higher in T1 ($79.2{\pm}5.4$) compared to T2 ($73.8{\pm}8.8$) and T3 ($73.9{\pm}7.0$), respectively. The animals were in positive nitrogen balance and N-balance varied from 1.8 to 2.9 g/d across treatment groups. The eating rate (% of total offered) of concentrate up-to 15 min was relatively higher in T1 (82.4) than T2 (74.2) and T3 (77.8%). However no effect of leucaena seeds was recorded on total DMI of animals. The results of the study revealed that the inclusion of up to 50% leucaena seeds, as protein source in concentrate mixture of lambs had no adverse effect on DMI, nutrient utilization, eating patterns, nitrogen balance and growth performance of lambs.

Promoting medicinal plants cultivation as a tool for biodiversity conservation and livelihood enhancement in Indian Himalaya

Prakash C. Phondani,Indra D. Bhatt,Vikram S. Negi,Bhagwati P. Kothyari,Arvind Bhatt,Rakesh K. Maikhuri 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.1

The present paper discusses the development of a participatory approach to promote medicinal and aromatic plant (MAP) cultivation as a tool for biodiversity conservation and livelihood enhancement in Champawat district of Uttarakhand state in India. People perception analysis revealed that farmers were dependent solely on the wild collection of MAPs before the initiation of the National Agriculture Innovation Project. However, they later engaged in cultivation practices. During the course of study, the propagation protocols of 11 selected MAPs of that area were developed and a cost-benefit analysis was performed. A series of meetings and exposure visits were organized and a memorandum of understanding was simultaneously signed between farmers and traders for promoting a buy-back system of MAPs. One hundred thirty-two farmers adopted MAP cultivation in 14 hectares of land. This approach provides opportunities for farmers to build skills, knowledge, and self confidence, and conserve MAP diversity in their natural habitat.

Structural and magnetic study of dysprosium substituted cobalt ferrite nanoparticles

Kumar, H.,Srivastava, R.C.,Pal Singh, J.,Negi, P.,Agrawal, H.M.,Das, D.,Hwa Chae, K. North-Holland Pub. Co 2016 Journal of magnetism and magnetic materials Vol.401 No.-

The present work investigates the magnetic behavior of Dy<SUP>3+</SUP> substituted cobalt ferrite nanoparticles. X-ray diffraction studies reveal presence of cubic spinel phases in these nanoparticles. Raman spectra of these nanoparticles show change in intensity of Raman bands, which reflects cation redistribution in cubic spinel lattice. Saturation magnetization and coercivity decrease with increase of Dy<SUP>3+</SUP>concentration in these nanoparticles. Room temperature Mossbauer measurements show the cation redistribution in these nanoparticles and corroborates the results obtained from Raman Spectroscopic measurements. Decrease in magnetization of Dy<SUP>3+</SUP> substituted cobalt ferrite is attributed to the reduction in the magnetic interaction and cation redistribution.

Consequences of electronic excitations in CoFe1.90Dy0.10O4

Hemaunt Kumar,Jitendra Pal Singh,R.C. Srivastava,P. Negi,H.M. Agrawal,Kandasami Asokan,원성옥,채근화 한국물리학회 2015 Current Applied Physics Vol.15 No.12

Present work reports the irradiation induced effects in Dy3þ doped cobalt ferrite nanoparticles in the regime of dominant electronic excitation processes induced by 100 MeV O7þ ion irradiation. Irradiation leads to the deterioration of crystalline phase as envisaged by X-ray diffraction. Crystallite size decreases with the increase of irradiation fluence. Disappearance of certain bands in Raman spectra at higher fluence of irradiation confirms the crystalline disorder induced by electronic excitations. Fourier transform infrared spectra show onset of cation migration from tetrahedral site to octahedral site and vice versa. X-ray absorption fine structure measurements depict the preservation of valence state of metal ions after irradiation. These measurements further infer bond breaking process in irradiated materials. Magnetic measurements carried out on these materials indicate slight increase of saturation magnetization at room temperature followed by the decrease of coercive field. Obtained results are discussed on the basis of appropriate mechanism.