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Panda, N.,Kim, M.,Aoki, N.,Zhou, Z.,Shimosaka, T.,Kim, Y.,Lee, S.,Kim, D. Springer Science + Business Media 2016 Accreditation and quality assurance Vol.21 No.4
<P>A validation study for primary formaldehyde gas standards was performed at three National Metrology Institutes: the Korea Research Institute of Standards and Science (KRISS), the National Metrology Institute of Japan (NMIJ) and the National Institute of Metrology of China (NIM). The studied materials had a nominal amount fraction of 2 mu mol/mol formaldehyde in nitrogen balance and were prepared in 10-L aluminum cylinders by KRISS. The impurities in the materials were analyzed using a gas chromatograph/atomic emission detector and a Fourier-transform infrared spectrometer (FTIR). The stability of the materials was assessed for 1 year by KRISS using paraformaldehyde as a source for the primary standard gas and a cavity ring-down spectrometer (CRDS) instrument as the measurement method. The amount fraction of formaldehyde in the materials decreased linearly by 0.74 % each month. The studied materials that exhibited similar linear rates of decline were distributed to the participants. After the measurement was completed by the participants, the materials were returned to KRISS and the stability analysis based on the primary standard maintained at KRISS was repeated. NMIJ analyzed the materials using paraformaldehyde as the source of the primary standard of formaldehyde and FTIR analysis, whereas NIM used trioxane as the primary standard gas source and CRDS analysis. The results of the comparison revealed good agreement between the results and were within the expanded uncertainty of 2 % although each of them used different combinations of methods in the generation of primary gas standards and measurements.</P>
Influence of silpozz and rice husk ash on enhancement of concrete strength
Panda, K.C.,Prusty, S.D. Techno-Press 2015 Advances in concrete construction Vol.3 No.3
This paper presents the results of a study undertaken to investigate the enhancement of concrete strength using Silpozz and Rice Husk Ash (RHA). The total percentage of supplementary cementitious material (SCM) substituted in this study was 20%. Six different concrete mixes were prepared such as without replacement of cement with silpozz and RHA (0% silpozz and 0% RHA) is treated as conventional concrete, whereas in other five concrete mixes cement was replaced by 20% of silpozz and RHA as (0% silpozz and 20% RHA), (5% silpozz and 15% RHA), (10% silpozz and 10% RHA), (15% silpozz and 5% RHA) and (20% silpozz and 0% RHA) with decreasing water-binder (w/b) ratio i.e. 0.375, 0.325 and 0.275 and increasing super plasticiser dose. New generation polycarboxylate base water reducing admixture i.e., Cera Hyperplast XR-W40 was used in this study. The results of this research indicate that as w/b decreases, super plasticiser dose need to be increased so as to increase the workability of concrete. The effects of replacing cement by silpozz and RHA on the compressive strength, split tensile strength and flexural strength were evaluated. The concrete mixture with different combination of silpozz and RHA gives higher strength as compared to control specimen for all w/b ratios and also observed that the early age strength of concrete is more as compared to the later age strength. It is also observed that the strength enhancement of concrete mixture prepared with the combination of cement, silpozz and RHA is higher as compared to the concrete mixture prepared with cement and silpozz or cement and RHA.
Panda, S.P.,Mishra, C.S.K.,Behera, D.K.,Kim, Jung Wk 서울大學校 環境大學院 2003 環境論叢 Vol.41 No.-
Approximately 600 tons of solid organic wastes and a huge bulk of sewage water are generated in Bhubaneswar city, Orissa, India daily endangering the urban environment. Solid wastes in windrows with sewage water inoculum decomposed faster compared to cow dung slurry and plain water treated wastes. C:N and C:P ratios declined relatively faster in sewage water treated windrows than cow dung slurry and water treated windrows during the experimental period of 45 days. The results indicated that the Bhubaneswar Municipal sewage water would be successfully utilised in solid waste composting.
Panda, S.P.,Mishra, C.S.K.,Muduli, R.,Behera, D.K.,Kim, Jung Wk 서울대학교 환경대학원 2004 環境論叢 Vol.42 No.-
Certain physicochemical and biological characteristics of well waters located near major solid waste disposal sites of Bhubaneswar city were studied in the dry and wet seasons of 2001 and 2002. Higher levels of NO₃^(-), PO₄^(--), Cl^(-), SO₄^(---), Fe, Ca, Mg, total hardness, and total and fecal coliform bacteria have been observed in the water samples in wet seasons relative to dry seasons. Most of the physicochemical and biological parameters exceeded the Indian drinking water standards prescribed by IS:10500:1991. The results indicated that in wet seasons, the well waters within 50 meters from municipal waste dumping sites were not suitable for drinking.
Tribochemistry of contact interfaces of nanocrystalline molybdenum carbide films
Kumar, D. Dinesh,Kumar, N.,Panda, Kalpataru,Kamalan Kirubaharan, A.M.,Kuppusami, P. Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.447 No.-
<P><B>Abstract</B></P> <P>Transition metal carbides (TMC) are known for their improved tribological properties and are sensitive to the tribo-atmospheric environment. Nanocrystalline molybdenum carbide (MoC) thin films were deposited by DC magnetron sputtering technique using reactive CH<SUB>4</SUB> gas. The friction and wear resistance properties of MoC thin films were significantly improved in humid-atmospheric condition as compared to high-vacuum tribo-condition. A comprehensive chemical analysis of deformed contact interfaces was carried out by X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDX) and Raman spectroscopy. XPS and Raman spectroscopy showed the formation of stable molybdenum-oxide (MoO), molybdenum carbide (MoC) and amorphous carbon (a-C) tribo-phases. Moreover, during the sliding in humid-atmospheric condition, these phases were extensively deposited on the sliding steel ball counter body which significantly protected against undesirable friction and wear.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reactive DC magnetron sputtered cubic phase of nanocrystalline MoC thin films. </LI> <LI> Chemical bonding analysis of MoC films using X-ray photoelectron spectroscopy. </LI> <LI> Tribological properties of MoC films in ambient and high-vacuum tribo-atmospheres. </LI> <LI> Comprehensive tribochemical analysis of contact interfaces. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Friction and wear behavior of nanocrystalline MoC films under atmospheric and high-vacuum conditions.</P> <P>[DISPLAY OMISSION]</P>
Bioprocess Optimization - a Challenge
( Tapobrata Panda ),( P S R Babu ),( J A Kumari ),( D S Rao ),( K Theodore ),( K Jagannandha Rao ),( S Siva Kesava ),( A Kapat ),( S R Nair ),( J Sinha ),( R Sreenivas ),( G Lakshmi Prasanna ),( V Ven 한국미생물생명공학회 1997 Journal of microbiology and biotechnology Vol.7 No.6
Performance Improvement of Dual-Half-Controlled-Converter and Its Applications in Utility Rectifiers
Y. Wang,D. Panda,T. A. Lipo,D. Pan 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents improved control techniques for the three-phase three-wire dual-half-controller-converter (DHCC) using an interleaved pulse-width-modulation (PWM) technique. Compared with the hysteresis controller presented in earlier literatures, the proposed PWM controllers require smaller filtering elements and/or a lower sampling frequency. While the same number of active switches are used compared to a conventional voltage-source-converter (VSC), the current rating for each device in DHCC is significantly lower. The proposed system is free of shoot through and it provides system redundancy. Both simulations and experimental results are presented.