http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Nagamani, Selvakumaran (검색결과 16 건)
- 무료
- 기관 내 무료
- 유료
-
Nagamani, Selvakumaran,Kumarasamy, Gunasekar,Song, Myungkwan,Kim, Chang Su,Kim, Dong-Ho,Ryu, Seung Yoon,Kang, Jae-Wook,Jin, Sung-Ho Elsevier 2016 Synthetic metals Vol.217 No.-
<P><B>Abstract</B></P> <P>The effects of the gold nanoparticles (Au NPs) on performance of organic solar cells (OSCs) are systematically investigated based on blend of the low band gap polymer and fullerene. The localized surface plasmon resonance (LSPR) induced by the Au NPs enhance the light absorption in the active layer and the photoluminescence spectra showed a significant enhancement in their intensity which mainly contribute to increased light absorption of active layer induced by LSPR. The impedance spectroscopy study revealed that the introduction of Au NPs as interfacial layer decreases the sheet and charge-transport resistance between ITO/PEDOT:PSS or PEDOT:PSS/active layer. From the results, the introduction of Au NPs increased the rate of exciton generation and the probability of exciton dissociation, thus enhancing the short-circuit current density and the fill factor The optimized OSCs incorporated with Au NPs were found to have power conversion efficiency of 5.40% compared to control device (4.65%), measured by using an AM 1.5G solar simulator at 100mW/cm<SUP>2</SUP> light illumination intensity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of gold nanoparticles (Au NPs) at the interfaces of organic solar cells (OSCs) was studied. </LI> <LI> The device using Au NPs at the interfaces of OSCs has a better efficiency due to localized surface plasmon resonance effect. </LI> <LI> The device with Au NPs at the interfaces showed 16.1% enhancement in efficiency. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Incorporation of gold nanoparticles (Au NPs) at the interfaces of organic solar cells enhance the light absorption in the active layer and the photoluminescence spectra showed a significant enhancement in their intensity which mainly contributes to the increased light absorption of active layer induced by localized surface plasmon resonance. The device with Au NPs at the interfaces showed 16.1% enhancement in efficiency.</P> <P>[DISPLAY OMISSION]</P>
-
Nagamani, G.,Joo, Young Hoon,Radhika, T. Springer-Verlag 2018 Nonlinear dynamics Vol.91 No.4
<P>In this paper, a new double integral inequality which covers the well-known Wirtinger's double integral inequality has been developed to analyze the dissipativity behavior of continuous-time neural networks involving Markovian jumping parameters with some unknown transition probabilities and random delays. Based on this generalized double integral inequality, the dissipativity conditions are proposed in terms of linear matrix inequalities by constructing an appropriate Lyapunov-Krasovskii functional with some multiple integral terms under the consideration of free-matrix-based integral inequality and Finsler's lemma approach. Finally, the effectiveness and the advantages of the proposed technique have been exhibited through numerical simulations.</P>
-
Al-doped ZnS layers synthesized by solution growth method
K. Nagamani,N. Revathi,P. Prathap,Y. Lingappa,K.T. Ramakrishna Reddy 한국물리학회 2012 Current Applied Physics Vol.12 No.2
ZnS is one of the potential candidates as a window/buffer layer for solar photovoltaic applications. Aldoped ZnS nanocrystalline films were grown by a simple and economic process, chemical solution growth method. The layers were prepared for different Al-dopant concentrations that vary in the range, 0e10 at. %. The effect of Al-doping on the composition, structure, optical, electrical and photoluminescence properties of the synthesized layers was determined using appropriate techniques. The elemental composition of a typical sample with 6 at. % ‘Al’ in ZnS was Zn ¼ 44.9 at. %, S ¼ 49.8 at. % and Al ¼ 5.3 at. %. The films were nanocrystalline in nature and showed (111) plane of ZnS as the preferred orientation for all the doping concentrations. The layers with 6 at. % of Al showed a crystallite size of w9 nm. The FTIR studies confirmed the presence of ZnS in the layers. The layers showed an average transmittance of w75% in the visible region. The change of photoluminescence behaviour with dopant concentration was also studied. The electrical resistivity was considerably decreased from 107 Ucm to 103 Ucm with Al-doping. The detailed analysis of results will be presented and discussed.
-
Behavior of high-strength fiber reinforced concrete plates under in-plane and transverse loads
Ramadoss, P.,Nagamani, K. 국제구조공학회 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.31 No.4
The concrete plates are most widely used structural elements in the hulls of floating concrete structures such as concrete barges and pontoons, bridge decks, basement floors and liquid storage tanks. The study on the behavior of high-strength fiber reinforced concrete (HSFRC) plates was carried out to evaluate the performance of plates under in-plane and transverse loads. The plates were tested in simply supported along all the four edges and subjected to in-plane and traverse loads. In this experimental program, twenty four 150 mm diameter cylinders and twelve plate elements of size 600 × 600 × 30 mm were prepared and tested. Water-to-cementitious materials ratios of 0.3 and 0.4 with 10% and 15% silica fume replacements were used in the concrete mixes. The fiber volume fractions, Vf = 0%, 1% and 1.5% with an aspect ratio of 80 were used in this study. The HSFRC mixes had the concrete ompressive strengths in the range of 52.5 to 70 MPa, flexural strengths ranging from 6.21 to 11.08 MPa and static modulus of elasticity ranging from 29.68 to 36.79 GPa. In this study, the behavior of HSFRC plate elements subjected to combined uniaxial in-plane and transverse loads was investigated.
-
P. Ramadoss,K. Nagamani 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.9 No.2
The contribution of steel fibers on the 28-day compressive strength of high-performance steel fiber reinforced concrete was investigated, is presented. An extensive experimentation was carried out over water-cementitious materials (w/cm) ratios ranging from 0.25 to 0.40, with silica fume- cementitious materials ratios from 0.05 to 0.15, and fiber volume fractions (Vf = 0.0, 0.5, 1.0 and 1.5%) with the aspect ratios of 80 and 53. Based on the test results of 44 concrete mixes, mathematical model was developed using statistical methods to quantify the effect of fiber content on compressive strength of HPSFRC in terms of fiber reinforcing index. The expression, being developed with strength ratios and not with absolute values of strengths, is independent of specimen parameters and is applicable to wide range of w/cm ratios, and used in the mix design of steel fiber reinforced concrete. The estimated strengths are within ±3.2% of the actual values. The model was tested for the strength results of 14 mixes having fiber aspect ratio of 53. On examining the validity of the proposed model, there exists a good correlation between the predicted values and the experimental values of different researchers. Equation is also proposed for the size effect of the concrete specimens.
-
P. Ramadoss,K. Nagamani 한국계산역학회 2006 Computers and Concrete, An International Journal Vol.3 No.6
This paper presents the investigations towards developing a better understanding on the contribution of steel fibers on the tensile strength of high-performance fiber reinforced concrete (HPFRC). An extensive experimentation was carried out with w/cm ratios ranging from 0.25 to 0.40 and fiber content ranging from zero to 1.5 percent with an aspect ratio of 80. For 32 concrete mixes, flexural and splitting tensile strengths were determined at 28 days. The influence of fiber content in terms of fiber reinforcing index on the flexural and splitting tensile strengths of HPFRC is presented. Based on the test results, mathematical models were developed using statistical methods to predict 28-day flexural and splitting tensile strengths of HPFRC for a wide range of w/cm ratios. The expressions, being developed with strength ratios and not with absolute values of strengths and are applicable to wide range of w/cm ratio and different sizes/shapes of specimens. Relationship between flexural and splitting tensile strengths has been developed using regression analysis and absolute variation of strength values obtained was within 3.85 percent. To examine the validity of the proposed model, the experimental results of previous researchers were compared with the values predicted by the model.
-
P. Ramadoss,K. Nagamani 사단법인 한국계산역학회 2013 Computers and Concrete, An International Journal Vol.11 No.2
The complete stress-strain behavior of steel fiber reinforced concrete in compression is needed for the analysis and design of structures. An experimental investigation was carried out to generate the complete stress-strain curve of high-performance steel fiber reinforced concrete (HPSFRC) with a strength range of 52–80 MPa. The variation in concrete strength was achieved by varying the water-to-cementitious materials ratio of 0.40-0.25 and steel fiber content (Vf = 0.5, 1.0 and 1.5% with l/d = 80 and 55) in terms of fiber reinforcing parameter, at 10% silica fume replacement. The effects of these parameters on the shape of stress-strain curves are presented. Based on the test data, a simple model is proposed to generate the complete stress-strain relationship for HPSFRC. The proposed model has been found to give good correlation with the stress-strain curves generated experimentally. Inclusion of fibers into HPC improved the ductility considerably. Equations to quantify the effect of fibers on compressive strength, strain at peak stress and toughness of concrete in terms of fiber reinforcing index are also proposed, which predicted the test data quite accurately. Compressive strength prediction model was validated with the strength data of earlier researchers with an absolute variation of 2.1%.
-
A new strength model for the high-performance fiber reinforced concrete
P. Ramadoss,K. Nagamani 사단법인 한국계산역학회 2008 Computers and Concrete, An International Journal Vol.5 No.1
Steel fiber reinforced concrete is increasingly used day by day in various structural applications. An extensive experimentation was carried out with w/cm ratio ranging from 0.25 to 0.40, and fiber content ranging from zero to1.5 percent by volume with an aspect ratio of 80 and silica fume replacement at 5%, 10% and 15%. The influence of steel fiber content in terms of fiber reinforcing index on the compressive strength of high-performance fiber reinforced concrete (HPFRC) with strength ranging from 45 85 MPa is presented. Based on the test results, equations are proposed using statistical methods to predict 28-day strength of HPFRC effecting the fiber addition in terms of fiber reinforcing index. A strength model proposed by modifying the mix design procedure, can utilize the optimum water content and efficiency factor of pozzolan. To examine the validity of the proposed strength model, the experimental results were compared with the values predicted by the model and the absolute variation obtained was within 5 percent.
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
