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( Indranil Manna ),( Gulshanlalkhanna ),( Prakash Chandradhara ) 한국스포츠정책과학원(구 한국스포츠개발원) 2011 International Journal of Applied Sports Sciences Vol.23 No.1
The aim of this study was to investigate the effect of training onbody composition, aerobic capacity, anaerobic power and strength of field hockey players of selectedage groups. A total of 120 field hockey players volunteered for this study. The players were divided equally into 4 groups (n=30): (i) under 16 years (U16, age: 14.00-15.99 yr); (ii) under 19 years (U19, age: 16.00-18.99 yr); (iii) under 23 years (U23, age: 19.00-22.99 yr) and (iv) senior (SR, age: 23.00-30.00 yr). The training sessions were divided into 2 phases (a) Preparatory Phase (PP, 8 weeks) and (b) Competitive Phase (CP, 4 weeks). The training programme consisted of aerobic, anaerobic and skill development, and was implemented 4 hrs/day; 5 days/week. Selected variables were measured at zero level (baseline data, BD) and at the end of PP and CP. A significant increase (P<0.05) in lean body mass (LBM), VO2max, anaerobic power, grip and back strength; and a decrease (P<0.05) in body fat and recovery heart rate were noted especially in U16, U19 and U23 groups in PP and CP when compared to BD. However, no significant change was noted in body mass and maximal heart rate of the players after the training. When comparing different age groups significantly (P<0.05) higher LBM, anaerobic power, strength and lower (P<0.05) body fat and VO2max were noted in U23 and senior players than in the U16 and U19 players. Training effects were reflected on various parameters of different age group players. The unique profile of age related changes should be taken into consideration while administering training to the players. This would enable the coaches to assess the current status of an athlete and the degree of training adaptability and provide an opportunity to modify the training schedule accordingly to achieve the desired performance.
Acceleration and Collimation of Pair-Plasma Jets by Radiation Pressure
Indranil Chattopadhyay 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.2I
Sub-Keplerian (SKH) flow around black holes produces a centrifugal-pressure-supported shock. The post-shock matter abbreviated as CENBOL inverse-Comptonizes soft photons from the outer Keplerian disc to produce hard photons. We show that these hard photons from CENBOL can accelerate pair-plasma jets to relativistic terminal speeds while soft photons from the Keplerian disc are better collimating agents. We show that if shocks are formed at larger distances from the black hole, collimation is better, but acceleration is less.=
Indranil Chattopadhyay 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
Accretion °ows around black holes have long been known to admit standing or oscillating shocks. Post-shock accretion °ows are hot and produce out°ows as well as high energy photons by inverse- Comptonizing low-energy photons from the outer Keplerian disc. We show that in the `intermediate- hard' spectral states of the disc, radiation collimates and accelerates the out°ow to relativistic terminal speedk.js
Indranil Roy,Goutam K. Saha 한국응용곤충학회 2010 Journal of Asia-Pacific Entomology Vol.13 No.2
Two new species of predatory mites, one each of Bdellodes Oudemans (Fam. Bdellidae) and Phytoseius Ribaga (Fam. Phytoseiidae) recorded for the first time from two medicinal plants viz. Ambroma augusta (L.) L.f. (Fam. Sterculiaceae) and Clerodendrum viscosum Vent (Fam. Verbenaceae), respectively, are described in this paper.
Indranil Saha,Uday Chand Ghosh,Kaushik Gupta,Sudipta Chakraborty,Debashis Chatterjee 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
This study investigates the adsorption of As(III) on b-cyclodextrin modified hydrous ferric oxide (HCC). This is characterized by XRD, FESEM, AFM, XPS, BET, surface site concentration and FTIR. The modification of hydrous ferric oxide (HFO) surface by b-cyclodextrin provides ample –OH groups which in turn increase As(III) adsorption on HCC compared to HFO. The adsorption remains almost constant in pH range 3–8 which decreases at higher pH (>8) and followed monolayer and pseudo first order kinetics. It is spontaneous at 303 K with increasing entropy and decreasing enthalpy. Thus HCC is found to be more efficient adsorbent than HFO.
Sinha, Indranil,Lee, Yuseop,Bae, Choongman,Tussupbayev, Samat,Lee, Yujin,Seo, Min-Seob,Kim, Jin,Baik, Mu-Hyun,Lee, Yunho,Kim, Hyunwoo The Royal Society of Chemistry 2017 Catalysis Science & Technology Vol.7 No.19
<▼1><P>The mechanism of Fe-catalyzed cyclic carbonate formation of CO2 and internal epoxides was studied to identify design strategies for more efficient catalysts.</P></▼1><▼2><P>The catalytic mechanism of the cyclic carbonate formation reaction between CO2 and internal epoxides promoted by Fe-salen and the Kleij catalyst was examined in detail to better understand how the catalytic efficiency can be increased. Specifically, we aimed to make the catalyst more chemoselective towards forming cyclic carbonates and preventing the competing side reaction leading to polycarbonates <I>via</I> ring-opening polymerization. A few rational design principles were derived and first tested using computer models based on density functional theory. The most promising candidate that was identified in the computer model was then prepared and found to display significantly enhanced reactivity towards forming the cyclic carbonates, supporting the validity of the mechanistic insights deduced from the computer simulations. We propose that a cyclic carbonate is formed most efficiently <I>via</I> an inner-sphere mechanism where both the CO2 and epoxide substrates utilize the metal center for the key bond forming events. In contrast, the ring-opening polymerization uses an outer-sphere mechanism, where a carbonate attacks and ring-opens the epoxide bound to the metal without engaging the metal directly. These mechanistic differences are exploited to implement a chemoselective catalyst by enhancing the rate of the cyclic carbonate formation reaction while leaving the polymerization pathway largely unaffected.</P></▼2>
Ultrathin alumina-coated carbon nanotubes as an anode for high capacity Li-ion batteries
Lahiri, Indranil,Oh, Seung-Min,Hwang, Jun Y.,Kang, Chiwon,Choi, Mansoo,Jeon, Hyeongtag,Banerjee, Rajarshi,Sun, Yang-Kook,Choi, Wonbong Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.35
<P>Alumina-coated carbon nanotubes (CNTs) were synthesized on a copper substrate and have been used as an anode in Li-ion batteries. CNTs were grown directly on the copper current collector by chemical vapor deposition and an ultrathin layer of alumina was deposited on the CNTs by atomic layer deposition, thus forming the binder-free electrode for the Li-ion battery. While CNTs, which form the core of the structure, provide excellent conductivity, structural integrity and Li-ion intercalation ability, the aluminium oxide coating provides additional stability to the electrode, with further enhancement of capacity. The anode showed very high specific capacity, good capacity retention ability and excellent rate capability. This novel anode may be considered as an advanced anode for future Li-ion batteries.</P> <P>Graphic Abstract</P><P>Nanometer level alumina coating on CNTs improves performance of CNT-on-Cu anode in Li-ion battery through higher Li<SUP>+</SUP> intercalation capacity and enhanced protection of SEI layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm11474c'> </P>
Lahiri, Indranil,Oh, Sung-Woo,Hwang, Jun Y.,Cho, Sungjin,Sun, Yang-Kook,Banerjee, Rajarshi,Choi, Wonbong American Chemical Society 2010 ACS NANO Vol.4 No.6
<P>We present a novel binder-free multiwall carbon nanotube (MWCNT) structure as an anode in Li ion batteries. The interface-controlled MWCNT structure, synthesized through a two-step process of catalyst deposition and chemical vapor deposition (CVD) and directly grown on a copper current collector, showed very high specific capacity, almost three times as that of graphite, excellent rate capability even at a charging/discharging rate of 3 C, and no capacity degradation up to 50 cycles. Significantly enhanced properties of this anode could be related to high Li ion intercalation on the carbon nanotube walls, strong bonding with the substrate, and excellent conductivity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-6/nn100400r/production/images/medium/nn-2010-00400r_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn100400r'>ACS Electronic Supporting Info</A></P>