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Kumar, Vineet,Tewari, S. K.,Awasthi, A. K.,Datta, R. K. 한국잠사학회 1999 한국잠사곤충학회지 Vol.41 No.2
Under Light and Scanning electron microscope, the pupal morphology of mulberry silkworm Bombyx mori Linn. revealed the reduced prothorax and metathorax, well developed mesothorax, less defined last pair of spiracle, well exposed prothoracic femora and wing pads approaching the anterior margin of Ab III. The important sex separating characters viz. pupal size, weigt, antennal elevations, intersegmental lines and genital openings have been discussed. Further, two separate openings bursa copultrix and ovipositional opening were observed, performing different functions in adult moth.
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.
Panwar, Varij,Gill, Fateh Singh,Rathi, Vikas,Tewari, V.K.,Mehra, R.M.,Park, Jong-Oh,Park, Sukho Elsevier 2017 Materials chemistry and physics Vol.193 No.-
<P><B>Abstract</B></P> <P>The fabrication of strong conducting composite sheets (CCSs) using a simple technique with cost-effective materials is desirable for capacitor, decoupling capacitor, and electromagnetic interference (EMI) shielding applications. Here, we used cost-effective graphite flakes (GFs) as a conducting filler and amorphous poly (styrene-co-acrylonitrile) (PSAN) as an insulating polymer to fabricate a CCS via a simple mechanical mixing and hot compression molding process in 2.5 h, with the aim to save time and avoid the use of toxic reagents, which are generally used in chemical methods. In the present method, the GFs are connected in diffusively adhere polymer matrix, controlled by temperature and pressure that generate the conduction in the CCSs. The resulting PSAN/GF CCSs were characterized by using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and hardness tests. The GFs penetrated the interfacial region of PSAN, thus improving the thermistor and dielectric properties (dielectric constant, AC conductivity, and dissipation factor) of the PSAN/GF CCSs. Furthermore, the PSAN/GF CCSs showed enhanced hardness and EMI shielding effectiveness (SE) properties in the X-band frequency range (8.5–12.5 GHz). The percolation theory was implemented to DC and AC conductivity. To detect the transition of the dielectric properties, the dielectric constant of the CCSs was analyzed with increasing volume fraction of GFs in the radio frequency region. The improved dielectric constant, AC conductivity, and dissipation factor of the PSAN/GF CCS, indicated a significant improvement in their EMI shielding properties in the X-band frequency range, which were measured using the waveguide method. The ac conductivity of PSAN/GF CCS shows stable behavior in the higher frequency ranges. The EMISE of PSAN/GF CCS were found to increase with increasing GF content due to the absorbance mechanism.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Enhanced hardness and thermal stability of PSAN/GF conducting composite sheet (CCS). </LI> <LI> Enhanced dielectric and electromagnetic interference shielding of PSAN/GF CCS. </LI> <LI> Cost-effective and fast fabrication method of PSAN/GF CCS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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.