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RISS 인기검색어
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- 저자 : Ramgopal, Sivanadham (검색결과 6 건)
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Modeling and Simulation of Nano and Multiscale Composites
B. Ramgopal Reddy,K. Ramji 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.3
Carbon nanotubes (CNTs) are being used extensively as reinforcing materials in polymer matrix composites because of their high strength, stiffness and resilience, as well as superior mechanical, electrical and thermal properties. Incorporating CNTs in polymer matrix composites can potentially enhance the strength and stiffness of composites significantly. In this paper, the effective elastic properties of nanocomposites (CNTs/Epoxy) at different volume fractions of CNTs and multiscale composites (Glass/CNTs/Epoxy) at 5% volume fraction of CNTs are evaluated using finite element method (FEM). 3-D finite element models using square representative volume element (RVE) incorporating necessary boundary conditions are developed. For validity the obtained results are compared with that of classical theories of equivalent material properties. Good agreement between them has been observed. Further the effect of CNT-integration in fiber-reinforced composites (three-phase) is also studied.
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Device and Circuit Performance Issues with Deeply Scaled High-K MOS Transistors
Rao, V. Ramgopal,Mohapatra, Nihar R. The Institute of Electronics and Information Engin 2004 Journal of semiconductor technology and science Vol.4 No.1
In this paper we look at the effect of Fringe-Enhanced-Barrier-lowering (FEBL) for high-K dielectric MOSFETs and the dependence of FEBL on various technological parameters (spacer dielectrics, overlap length, dielectric stack, S/D junction depth and dielectric thickness). We show that FEBL needs to be contained in order to maintain the performance advantage with scaled high-K dielectric MOSFETs. The degradation in high-K dielectric MOSFETs is also identified as due to the additional coupling between the drain-to-source that occurs through the gate insulator, when the gate dielectric constant is significantly higher than the silicon dielectric constant. The technology parameters required to minimize the coupling through the high-K dielectric are identified. It is also shown that gate dielectric stack with a low-K material as bottom layer (very thin $SiO_2$ or oxy-nitride) will be helpful in minimizing FEBL. The circuit performance issues with high-K MOS transistors are also analyzed in this paper. An optimum range of values for the dielectric constant has been identified from the delay and the energy dissipation point of view. The dependence of the optimum K for different technology generations has been discussed. Circuit models for the parasitic capacitances in high-K transistors, by incorporating the fringing effects, have been presented.
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Rahul Saha,Ramgopal V.S. Uppaluri,Pankaj Tiwari 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
The current study examines the synergy of interfacial tension, emulsification, wettability alteration and extent of saponification during alkali flooding for light to moderate crude oil. The oil recovered in the effluent stream during NaOH flooding was analysed to observe the quality of water in oil (W/O) emulsion produced and the extent of saponification. Core flooding experiments showed higher oil recovery of 25.48% initial oil in place (IOIP) at 1 wt% NaOH. Effects of slug volume and injection pattern during NaOH flooding experiments were also investigated. Further, contact angle changes the wettability from water wet to favourable intermediate wet.
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Rathika, Chinniah,Murali, Vijayan,Dhivakar, Mani,Kamaraj, Raju,Malini, Ravi Padma,Ramgopal, Sivanadham,Balakrishnan, Karuppiah Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.5
Background: Human leukocyte antigen (HLA) genes have been implicated in cervical cancer in several populations. Objectives: To study the predispositions of HLA alleles/haplotypes with cervical cancer. Materials and Methods: Clinically diagnosed and PAP smear confirmed cervical cancer patients (n 48) and age matched controls (n 47) were genotyped for HLA-A,-B,-DRB1* and DQB1* alleles by PCR-SSP methods. Results: The frequencies of alleles DRB1*04 (OR=2.57), DRB1*15 (OR=2.04), DQB1*0301 (OR=4.91), DQB1*0601 (OR=2.21), B*15 (OR=13.03) and B*07 (OR=6.23) were higher in cervical cancer patients than in the controls. The frequencies of alleles DRB1*10 (OR=0.22) and B*35 (OR=0.19) were decreased. Strong disease associations were observed for haplotypes DRB1*15-DQB1*0601 (OR=6.56; p< $3.5{\times}10^{-4}$), DRB1*14-DQB1*0501 (OR=6.51; p<0.039) and A*11-B*07 (OR=3.95; p<0.005). The reduced frequencies of haplotypes DRB1*10-DQB1*0501 (OR=0.45), A*03-B*35 (OR=0.25) and A*11-B*35 (OR= 0.06) among patients suggested a protective association. HLA-C* typing of 8 patients who possessed a unique three locus haplotype 'A*11-B*07-DRB1*04' (8/48; 16.66%; OR=6.51; p<0.039) revealed the presence of a four locus haplotype 'A*11-B*07-C*01-DRB1*04' in patients (4/8; 50%). Amino acid variation analysis of susceptible allele DQB1*0601 suggested 'tyrosine' at positions ${\beta}9$ and ${\beta}37$ and tyrosine-non-tyrosine genotype combination increased the risk of cervical cancer. Conclusions: Strong susceptible associations were documented for HLA alleles B*15, B*07, DRB1*04, DRB1*15, DQB1*0301, DQB1*0601 and haplotypes DRB1*15-DQB1*0601 and DRB1*14-DQB1*0501. Further, protective associations were evidenced for alleles B*35 and DRB1*10 and haplotypes A*11-B*35 and DRB1*10-DQB1*0501 with cervical cancer in South India.
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Ram Gopal,Yi-Chiang Huang,Hsu-Feng Lee,Ming-Sien Chang,Wen-Yao Huang 대한금속·재료학회 2017 ELECTRONIC MATERIALS LETTERS Vol.13 No.3
A new novel blue light emitting polymer containing carbazole andanthracene derivatives has been successfully synthesized via polycondensationchemical reaction of diol and difluoro monomers. An effort has been madeto raise the band gap of blue light emitter by lowering the conjugation extentin the backbone. The synthesized blue polymer exhibits decent solubility,good process ability, high thermal stability, high glass transition temperature(272 °C) and the decomposition temperature of 358 °C. The UV-visabsorption spectra and photoluminescence spectra depict that the lightemission lies in blue region. The solid state photoluminescence (PL) spectraof the polymer (λPL = 456 nm) shows red shift (Δλ = 37 nm) as comparedwith the corresponding solution PL spectra, presumably due to lowerintermolecular distance in solid state. The multi-layered polymer lightemitting diode was fabricated, using blue polymer with ITO/PEDOT: PSS/BP/LiF/Al architecture. The luminance-voltage (L-V) and current densityvoltage(J-V) curves show a maximum luminance of 7544 cd m−2, amaximum emission efficiency of 4.2 cd A−1, a maximum current density of453 mA cm−2 at a turn-on voltage of 4.5 V. Moreover, the PLED instigatepure blue EL emission, stable at 436 nm with outstanding CIE coordinates of(x = 0.15, y = 0.08), which is close to the pure NTSC blue coordinates of(0.14, 0.08).
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