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S. Prabhakaran,R. Malathy,M. Kasiviswanathan 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.90 No.2
Cold-formed steel (CFS) I sections are increasingly being used as load-bearing components in building constructions, and such I sections frequently incorporate web holes to facilitate service installation. The economical and structural advantages of these elements have prompted many researchers to investigate the behavior of such structures. Despite numerous studies on the buckling stability of castellated beams, there is a notable absence of experimental investigation into oval castellated beams with stiffeners. This study examines the local buckling of cold-formed steel castellated I-beams stiffened with oval constellations through experimental and numerical analysis. Four specimens are fabricated with and without stiffeners, including parallel, perpendicular, and intersecting types attached to the web portion of the beam, along with cross stiffeners for the oval-shaped openings at the beam ends. Additionally, a numerical model is developed to predict the behavior of castellated beams with oval openings up to failure, considering both material and geometric nonlinearities. Codal analysis is performed using the North American specification for cold-formed steel AISI S-100 and the Australian/New Zealand design code AS/NZS 4600. The anticipated outcomes from numerical analysis, experimental research, and codal analysis are compared and presented. It will be more helpful to the preliminary designers.
S. Prabhakaran,S. A. Maboob 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
The main purpose of the current research work is to achieve an economical cold formed steel castellated beam with diamond castellation with limited buckling. In this way, to study the behavior of cold formed steel castellated beam with diamond castellation by the provision of diff erent methods of placing the stiff eners for the sections is an main scope of the work. It can be achieved through this paper, which gives an Numerical, Analytical Study and Experimental investigation on the performance of cold-formed steel Castellated beams with Diamond Castellation shape. Perforations in web has been carried out to know its structural behaviour as simply supported beam under pure bending. The castellated steel beams with perforated web epitomize a new inventive which has occurred in the past span for the short- and medium length of beams. The Cold- Formed Steel provides a substantial weight reduction of these beams with castellation, compared to the hot-rolled beams. The Castellated Beam has made with 2 mm thickness CFS Steel, used all over the Beam. In the study, the Castellated Beam has been performed with three types of Stiff ener Designs at web of the Beam. Beam with intercept Stiff eners plates at web has used. Both stiff ened and unstiff ened Castellated beam (Beam with Parallel, Perpendicular and intercept Stiff eners) were tested for numerical and experimental Testings. Finally, numerical analysis using ABAQUS 6.11 results are evaluated and the experimental results were confi rmed with the results obtained from the fi nite element analysis. Based up on the numerical analysis and experimental investigation the diff erent failure and buckling modes of the proposed beams has been studied and the load carrying capacity of beams has been predicted.
Bilayer splitting and wave functions symmetry inSr3Ir2O7
Moreschini, L.,Moser, S.,Ebrahimi, A.,Dalla Piazza, B.,Kim, K. S.,Boseggia, S.,McMorrow, D. F.,Rønnow, H. M.,Chang, J.,Prabhakaran, D.,Boothroyd, A. T.,Rotenberg, E.,Bostwick, A.,Grioni, M. American Physical Society 2014 Physical review. B, Condensed matter and materials Vol.89 No.20
The influence of dimensionality on the electronic properties of layered perovskite materials remains an outstanding issue. We address it here for Sr3Ir2O7, the bilayer compound of the iridate Srn+1IrnO3n+1 series. By angle-resolved photoemission spectroscopy we show that in this material the interlayer coupling is large and that the intercell coupling is, conversely, negligible. From a detailed mapping of the bilayer splitting, and from the intensity modulation of the bonding and antibonding bands with photon energy, we establish differences and similarities with the prominent case of the bilayer superconducting cuprates.
P. G. Freeman,S. R. Giblin,K. Hradil,R. A. Mole,D. Prabhakaran 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
The magnetic excitation spectrums of charge stripe ordered La2−xSrxNiO4 x = 0.45 and x = 0.4were studied by inelastic neutron scattering. We found the magnetic excitation spectrum of x = 0.45from the ordered Ni2+ S = 1 spins to match that of checkerboard charge ordered La1.5Sr0.5NiO4. The distinctive asymmetry in the magnetic excitations above 40meV was observed for both doping levels, but an additional ferromagnetic mode was observed in x = 0.45 and not in the x = 0.4. We discuss the origin of crossover in the excitation spectrum between x = 0.45 and x = 0.4 with respect to discommensurations in the charge stripe structure.
Degenerate multi-photon properties of spirofluorene derivatives.
Cho, Namchul,Baldeck, Patrice L,He, Guang S,Hwang, Do-Hoon,Prasad, Paras N,Prabhakaran, Pré,m,Kim, Tae-Dong,Lee, Kwang-Sup American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.10
<P>Two- and three-photon absorption properties of the fluorene-based chromophores have been investigated. The two- and three-photon absorption cross-section are found to be increased with the strength of the electron donor groups in the order of N-ethylcarbazoyl (1), triphenylamino (2), and N,N-dibutylanilino (3) groups. This nonlinear absorption enhancement can be interpreted by the increase of intramolecular charge transfer facilitated by strong electron donors and the decreased detuning energy (deltaE). Furthermore, direct laser microfabrication by two-photon photopolymerization with compound 2 as a two-photon sensitizer was carried out. Laser exposure time-dependent lateral voxel size has also been studied.</P>
PV fed Hybrid Power Converter for rural home applications
Karthikeyan A,Praneeth C.V.S,Prabhakaran K. K. 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a standalone PV fed hybrid power converter for rural home applications. The aim of the proposed system is to simultaneously deliver the power extracted from PV panels to DC and AC home loads using the proposed hybrid converter topology. The system operates in either MPP or Non–MPP mode depending on the total power demanded by the loads. Modified Perturb and Observe (P&O) MPPT algorithm is used to extract maximum power from PV panels. SPWM based modified PWM technique is used for converter operation. In the MPP mode the power distribution to DC load and AC load is in accordance with the duty generated by modified MPPT. In Non MPP mode, power distribution is in accordance with the duty generated by the single loop voltage control for DC load. The simulation studies for the proposed system are carried out in MATLAB/SIMULINK environment.