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Kumar, Naveen,Sharma, A.K.,Gangwar, A.K.,Maiti, S.K.,Gupta, O.P.,Kumar, N.,Mathur, R.B. Korean Carbon Society 2006 Carbon Letters Vol.7 No.2
During a 3-year period (2001-2004) 18 animals were surgically treated because of abdominal wall defects (hernia). Out of 18 animals 8 were bovines, 5 caprines and 5 canines. In each case the defect was bridged with carbon fibres. Carbon fibres were placed either in simple interrupted pattern or as mattress overlapping pattern. All the cases were successfully treated and no complication was observed up to six months postoperatively.
Naveen Kumar,A.K. Sharma,A.K. Gangwar,S.K. Maiti,O.P. Gupta,N. Kumar,R.B. Mathur 한국탄소학회 2006 Carbon Letters Vol.7 No.2
During a 3-year period (2001-2004) 18 animals were surgically treated because of abdominal wall defects (hernia). Out of 18 animals 8 were bovines, 5 caprines and 5 canines. In each case the defect was bridged with carbon fibres. Carbon fibres were placed either in simple interrupted pattern or as mattress overlapping pattern. All the cases were successfully treated and no complication was observed up to six months postoperatively.
Kumar, Naveen,Sharma, A.K.,Maiti, S.K.,Gangwar, A.K.,Kumar, N. Korean Carbon Society 2007 Carbon Letters Vol.8 No.4
During a 4-year period (2001-2005) 09 animals were surgically treated because of abdominal wall defects (hernia). Out of 9 animals 8 were bovines and one caprine. In each case the defect was repaired with carbon fibre mesh. All the cases were successfully treated and no complication was observed up to six months postoperatively.
Naveen Kumar,A.K. Sharma,S.K. Maiti,A.K. Gangwar,N. Kumar 한국탄소학회 2007 Carbon Letters Vol.8 No.4
During a 4-year period (2001-2005) 09 animals were surgically treated because of abdominal wall defects (hernia). Out of 9 animals 8 were bovines and one caprine. In each case the defect was repaired with carbon fibre mesh. All the cases were successfully treated and no complication was observed up to six months postoperatively.
Suman Paik,N. Naveen Kumar,B. K. Dutta,R. Tewari,P. V. Durgaprasad 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
This article investigates the deformation behaviour and fracture characteristics of copper single crystals by uniaxial tensileexperiments and compares the results with crystal plasticity simulations. Quasi-static tensile tests were carried out toinclude different stress–strain states by varying the crystal orientation with respect to specimen axis after determining theinitial orientation by Electron Backscatter Diffraction. The different ductile modes of failure of single crystals due to shearafter loading were examined. Thereafter, by employing the scanning electron microscopy and theoretical slip trace analysis,orientations of slip traces of deformed crystals were determined. Experimental results were then rationalised by performingcrystal plasticity finite element simulations, presuming cross-slip and associated dislocation dissociation into partials playan influential role on the orientation dependence of the material. A continuum ductile damage criterion was coupled withplasticity on capturing the slip localisation caused by material softening. Comparison between experimentally measuredand numerically obtained stress–strain data, texture evolution and fracture angles were subsequently evaluated. An evaluationhas also been made by comparing the identities of active slip modes attained from experiments with that of determinedfrom simulations.
Suman Paik,N. Naveen Kumar,B. K. Dutta,R. Tewari,P. V. Durgaprasad 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
This article investigates the deformation behaviour and fracture characteristics of copper single crystals by uniaxial tensileexperiments and compares the results with crystal plasticity simulations. Quasi-static tensile tests were carried out toinclude different stress–strain states by varying the crystal orientation with respect to specimen axis after determining theinitial orientation by Electron Backscatter Diffraction. The different ductile modes of failure of single crystals due to shearafter loading were examined. Thereafter, by employing the scanning electron microscopy and theoretical slip trace analysis,orientations of slip traces of deformed crystals were determined. Experimental results were then rationalised by performingcrystal plasticity finite element simulations, presuming cross-slip and associated dislocation dissociation into partials playan influential role on the orientation dependence of the material. A continuum ductile damage criterion was coupled withplasticity on capturing the slip localisation caused by material softening. Comparison between experimentally measuredand numerically obtained stress–strain data, texture evolution and fracture angles were subsequently evaluated. An evaluationhas also been made by comparing the identities of active slip modes attained from experiments with that of determinedfrom simulations.
Synergism between polyurethane and polydopamine in the synthesis of Ni-Fe alloy monoliths
( Santhana Sivabalan ),( Thangavel Naresh Kumar ),( Naveen Chandrasekaran ),( K. L. N. Phani ),서민강,김병석 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
We report the first synthesis of a light-weight macroporous 3-D alloy monolith of Ni-Fe/C using synergism between polydopamine (pDA) and polyurethane (pU); in situ formed polyurethane (pU) enables efficient mixing of pDA (carbon source) and Ni-FeOx resulting in Ni-Fe alloy monoliths at a temperature as low as ~600°C. The monolithic Ni-Fe/C exhibits enhanced oxygen evolution activity.
Carbon Fibres for the Repair of Abdominal Wall Defects in Rabbits
Gangwar, A.K.,Sharma, A.K.,Kumar, Naveen,Maiti, S.K.,Kumar, N.,Gupta, O.P.,Goswami, T.K.,Singh, Rajendra Korean Carbon Society 2005 Carbon Letters Vol.6 No.1
Sixteen clinically healthy New Zealand white rabbits of either sex were divided into two equal groups I and II of 8 animals each. Under thiopental sodium (2.5%) anaesthesia a linear full thickness abdominal wall defect of 3 cm in length was created and repaired with continuous suture pattern using 3000 filaments of carbon fibres and 1~0 black braided nylon suture, ingroup I and II respectively. Increased vascularity was observed in carbon fibres (group I) and on day 30 the carbon fibres were covered by white fibrous tissue. Significantly higher (P < 0.05) values of glucose was seen on day 14 in group I, whereas, decrease in glucose value was observed in group II. Histopathologically, the carbon fiber implant induced extensive fibrous tissue (collagen fiber) reaction. Negligible inflammatory cells in the stroma indicate the host tissue tolerance to carbon fibers. Histochemically, gradually increased alkaline phosphatase activity up to day 14 in group I, suggested the proliferation of fibroblasts in early stages.