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排序方式: 共有86条查询结果,搜索用时 15 毫秒
21.
S.N. Karthick S. Richard Prabhu Gnanakan A. Subramania Hee-Je Kim 《Journal of Alloys and Compounds》2010,489(2):674-677
Nanocrystalline cubic spinel lithium manganese oxide thin film was prepared by a polymer spray pyrolysis method using lithium acetate and manganese acetate precursor solution and polyethylene glycol-4000 as a polymeric binder. The substrate temperature was selected from the thermogravimetric analysis by finding the complete crystallization temperature of LiMn2O4 precursor sample. The deposited LiMn2O4 thin films were annealed at 450, 500 and 600 °C for 30 min. The thin film annealed at 600 °C was found to be the sufficient temperature to form high phase pure nanocrystalline LiMn2O4 thin film. The formation of cubic spinel thin film was confirmed by X-ray diffraction study. Scanning electron microscopy and atomic force microscopy analysis revealed that the thin film annealed at 600 °C was found to be nanocrystalline in nature and the surface of the films were uniform without any crack. The electrochemical charge/discharge studies of the prepared LiMn2O4 film was found to be better compared to the conventional spray pyrolysed thin film material. 相似文献
22.
Development of a conjugated polyaniline incorporated electrospun poly(vinylidene fluoride‐co‐hexafluoropropylene) composite membrane electrolyte for high performance dye‐sensitized solar cells 下载免费PDF全文
Vijayakumar Elayappan Vignesh Murugadoss Subramania Angaiah Zhaofu Fei Paul J. Dyson 《应用聚合物科学杂志》2015,132(45)
Different weight percentage (2, 3, 4, and 5 wt %) of polyaniline (PANI) were incorporated into electrospun poly(vinylidene fluoride‐co‐hexafluoropropylene) (PVdF‐HFP) composite membranes (esCPMs). The regular morphology, molecular structure, crystallinity, porosity, electrolyte uptake, and leakage of the composite membranes were examined. The esCPMs were activated in liquid electrolyte containing 0.5 M LiI, 0.05 M I2, and 0.5 M 4‐tert‐butylpyridine and 0.5 M 1‐butyl‐3‐methylimidazoliun iodide in acetonitrile to afford electrospun PVdF‐HFP/PANI composite membrane electrolytes (esCPMEs). The influence of different wt % of PANI on the esCPMEs was studied by electrochemical impedance measurements and Tafel polarization studies. The photovoltaic performance of a dye‐sensitized solar cell assembled using 3 wt % PANI incorporated esCPME exhibits a higher power conversion efficiency of 7.20% than that assembled using esPME (η = 6.42%). © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42777. 相似文献
23.
S.N. KarthickK.V. Hemalatha C. Justin RajA. Subramania Hee-Je Kim 《Thin solid films》2012,520(23):7018-7021
The surface morphology of titanium oxide (TiO2) films as a photoanode in dye sensitized solar cells plays a vital role in converting light to electricity. Therefore, TiO2 films were prepared using TiO2 paste with different compositions of poly(vinylpyrrolidone) (PVP) as a binder to optimize their physico-chemical properties. The paste was prepared with commercial TiO2 powder mixed with acetylacetone, PVP, 4-octylphenol polyethoxylate, acetic acid and ethanol. The chemical composition remains the same for all pastes except PVP. The quantity of the PVP was optimized in such a way that it provides a thick film with a good network connection. The impact of the quantity of PVP in the TiO2 paste was analyzed. The prepared TiO2 film structure was characterized by X-ray diffraction. The surface morphology was analyzed by scanning electron microscopy. The electrochemical performance of the prepared TiO2 as a photoanode was also investigated. Among the four different photoanodes, the cells fabricated with a TiO2 film prepared with 0.4 g of PVP exhibited the highest power conversion efficiency of 6.77%, short-circuit photocurrent density and open circuit voltage of 12.38 mA/cm2 and 0.77 V, respectively. 相似文献
24.
Dissimilar metal welds between ferritic low‐alloy and austenitic stainless steels commonly occur in power plant application. In order to overcome some of the problems encountered here, a trimetallic configuration using an intermediate piece (such as Alloy 800) between the austenitic and ferritic steels has been suggested. This paper describes some features of the joints between modified 9Cr‐1Mo steel and Alloy 800, produced with Inconel 82/182 filler material. The joints require heat‐treatment after welding and the results have shown that a treatment at 760 °C for 2 h would be optimal. Although most tensile failures occurred in the weld metal the welds were found to exhibit strength properties that are at least equal to those of Alloy 800, with a tensile elongation lying between those of the two base materials. Similarly, while the weld metals are slightly less tough than the two base materials, the weld metal toughness at 120 J is still quite adequate for the intended application. 相似文献
25.
In this technical note, the critical buckling of simply supported functionally graded skew plate subjected to mechanical compressive loads is evaluated using first-order shear deformation theory in conjunction with the finite element approach. The material properties are assumed to vary in the thickness direction according to the power-law distribution in terms of volume fractions of the constituents. The effective material properties are estimated from the volume fractions and the properties of the constituents using the Mori–Tanaka homogenization method. The effects of aspect ratio, material gradient index, and skew angle on the critical buckling loads of functionally graded material plates are highlighted. 相似文献
26.
S.N. Karthick K. Prabakar A. Subramania Ji-Tae Hong Jin-Ju Jang Hee-Je Kim 《Powder Technology》2011,205(1-3):36-41
Pure anatase nano-TiO2 powders were successfully prepared by a simple polymer gel technique using poly-(vinylpyrrolidone) (PVP) as the polymer. The products were systematically characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HR-TEM), UV–visible spectroscopy and photoluminescence studies. The XRD and XPS results indicate that the prepared powder had a pure anatase nano-TiO2 structure with lattice parameters a and c of 0.378 and 0.951 nm, respectively. The particle size analysed by TEM ranged between 7 and 12 nm. The maximum UV absorption for the TiO2 nanoparticles was below 400 nm with an estimated direct band gap (Eg) of 3.55 eV. The photoluminescence peaks of the nanopowder were observed at 391 and 468 nm. The nanosized materials were produced using a simple and cost effective polymer gel technique. 相似文献
27.
S Hashimoto S Chatterjee GB Ranjit C Bao J Ford R Ganapathi SJ Berger NA Berger 《Canadian Metallurgical Quarterly》1995,7(7-8):407-416
V511 and V513 cell lines, derived from Chinese hamster V79 cells following alkylating agent mutagenesis and subsequent selection with VP-16, showed resistance to cytotoxicity and DNA strand breaks induced by topoisomerase (topo) II inhibitors and were resistant to VP-16-induced sister chromatid exchanges. They showed no amplification of the multidrug-resistant p-glycoprotein. In a kinetoplast-DNA decatenation assay, V511 and V513 showed 51% and 49% topo II activity relative to parental V79 cells, respectively. By western-blot analysis all three logarithmically growing cell lines showed similar levels of topo II beta (M(r) 180,000), which increased as cells progressed to quiescence. In contrast, immunoreactive levels of topo II alpha (M(r) 170,000) were 6.8% in V511 and 62.4% in V513 relative to V79. V511 showed drastically decreased topo II alpha in both log growth and quiescence. In a second approach, immunoreactive topo II was analyzed in different phases of the cell cycle in logarithmically growing cells fractionated by fluorescence-activated cell sorting. All cell lines demonstrated relatively stable topo II beta throughout the cell cycle. Topo II alpha showed little cell cycle variation in V79 or V513. However, in V511, it was only detectable at low levels in G2/M phase. When cell growth parameters were measured, V511 and V513 showed a 17% increase in cell doubling time relative to V79. These studies indicate that cells with a drastic reduction in topo II alpha (V511) or mutant topo II alpha (V513) but with normal levels of topo II beta show only minor perturbations of cell growth. 相似文献
28.
This paper presents an investigation to study the effect of bolt load on the displacement and stress pattern of a taper hub flange. The flange is analysed both by finite difference and finite element methods. Novozhilov's self-consistent shell theory is applied in deriving the equations of equilibrium in the three dimensions. The axial displacements are important in any flange design with regard to the leakage characteristics of such a joint hence the preference to the above theory. The tapered hub is approximated by a series of consecutive stepped cylindrical shells. While applying the finite difference method, the flange ring is suitably modelled using the concept of branching of shells. In this work one such flange is analysed and the results of finite difference and finite element methods are found to be in agreement. 相似文献
29.
Large amplitude free flexural vibrations of laminated orthotropic plates are studied using C0 shear flexible QUAD-8 plate element. The nonlinear governing equations are solved using the direct iteration technique. Numerical results are obtained for isotropic, orthotropic and cross-ply laminated plates with simply-supported boundary conditions on immovable edges. It is observed that hardening behaviour is increased for thick plates and orthotropic plates. 相似文献
30.
B. P. Patel M. Ganapathi 《International journal for numerical methods in engineering》2002,54(11):1557-1577
Here, a new cubic B‐spline plate element is developed using field consistency principle, for vibration analysis. The formulation includes anisotropy, transverse shear deformation, in‐plane and rotary inertia effects. The element is based on a laminated refined plate theory, which satisfies the interface transverse shear stress and displacement continuity, and has a vanishing shear stress on the top and bottom surfaces of the plates. The lack of consistency in the shear strain field interpolations in its constrained physical limits produces poor convergence and results in unacceptable solutions due to locking phenomenon. Hence, numerical experimentation for the evaluation of natural frequencies of plates is carried out to check this deficiency with a series of assumed shear strain functions, redistributed in a field consistent manner. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献