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Dynamic response of a MRE sandwich structure under a non-homogenous magnetic field
Poojary Umanath R.,Hegde Sriharsha,Kiran Katari,Gangadharan K. V. 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.9
A viscoelastic layer improves the response of a sandwich structure under dynamic loading. Through integration of a magnetosensitive elastomer core, the adaptability of the structure over a wider frequency can be achieved. The current work focuses on the influence of a non-homogeneous magnetic field on a magnetorheological elastomer (MRE)-based sandwich cantilever beam. The dynamic response of the structure is measured using the impact hammer test as per the ASTM E-756-05 standard. Results revealed that the fundamental natural frequency of the MRE sandwich beam is a function of the intensity and the location of the non-homogenous magnetic field. The fundamental natural frequency is reduced as the magnitude of the magnetic flux density is increased or the magnetized region is shifted towards the fixed end. This unique response of the MRE sandwich beam under a non-homogenous magnetic field is an exception to the usual stiffness-enhancing behavior of a MRE. To study this disparity, we independently investigated the contributions by the localized stiffness enhancement and the deflection due to magnetic pull. The effect of the localized overall stiffness enhancement on the overall stiffness of the sandwich beam is investigated using modal analysis in ANSYS to analyze the variation in the fundamental frequency. The contribution due to magnetic pull is studied by performing an experimental modal analysis on an equivalent ferromagnetic cantilever beam deflected under the influence of a magnetic field. By comparing the experimental results and the corresponding investigation on the influencing factors, we confirmed that magnetic pull induced under non-homogenous magnetic field is an important parameter that significantly contributes to the dynamic response of a MRE sandwich beam.
Poojary Boja,SunWoo Won,Dong Hoon Suh,Jeonghyun Chu,박우규,Hee-Jong Lim 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
Inhibition of BACE 1 activity is considered as a promising therapeutic target for Alzheimer’s Disease (AD). Synthesis and inhibitory activities of (4-arylpiperazinyl)piperidines by bioisosteric replacement of a biaryl group with an arylpiperazine as BACE 1 inhibitors are described. The resulting (4-arylpiperazinyl)piperidines represent novel nonpeptide BACE 1 inhibitors with improved in vitro potency.
Boja, Poojary,Won, Sun-Woo,Suh, Dong-Hoon,Chu, Jeong-Hyun,Park, Woo-Kyu,Lim, Hee-Jong Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
Inhibition of BACE 1 activity is considered as a promising therapeutic target for Alzheimer's Disease (AD). Synthesis and inhibitory activities of (4-arylpiperazinyl)piperidines by bioisosteric replacement of a biaryl group with an arylpiperazine as BACE 1 inhibitors are described. The resulting (4-arylpiperazinyl)piperidines represent novel nonpeptide BACE 1 inhibitors with improved in vitro potency.
Symmetric key end to end Cryptosystem using Plateaued functions and Hadamard matrix
P. Poojary,K. Prakasha,P. K. Harikrishnan,G. R. Vadiraja Bhatta,Deepmala,A. Mitra 장전수학회 2020 Proceedings of the Jangjeon mathematical society Vol.23 No.1
Hadamard matrices are a special type of matrices having various applications in cryptography. Here we present a method for the construction of Hadamard matrices using plateaued Boolean functions. The key generated using Hadamard matrices is used for end to end encryption of the messages using symmetric key cryptography. The performance of the proposed system is compared with the Advanced Encryption Standard (AES), and RSA cryptosystems. The results prove that the proposed system outperforms existing systems.
Umanath R. Poojary,Sriharsha Hegde,K.V. Gangadharan 한국유변학회 2016 Korea-Australia rheology journal Vol.28 No.4
Magneto rheological elastomer (MRE) is a potential resilient element for the semi active vibration isolator. MRE based isolators adapt to different frequency of vibrations arising from the source to isolate the structure over wider frequency range. The performance of MRE isolator depends on the magnetic field and frequency dependent characteristics of MRE. Present study is focused on experimentally evaluating the dynamic stiffness and loss factor of MRE through dynamic blocked transfer stiffness method. The dynamic stiffness variations of MRE exhibit strong magnetic field and mild frequency dependency. Enhancements in dynamic stiffness saturate with the increase in magnetic field and the frequency. The inconsistent variations of loss factor with the magnetic field substantiate the inability of MRE to have independent control over its damping characteristics.
Seismic response analysis of reinforced concrete frames including soil flexibility
Jayalekshmi, B.R.,Poojary, V.G. Deepthi,Venkataramana, Katta,Shivashankar, R. Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.1
The seismic response of RC space frame structures with isolated footing resting on a shallow soil stratum on rock is presented in this paper. Homogeneous soil stratum of different stiffness in the very soft to stiff range is considered. Soil, footing and super structure are considered to be the parts of an integral system. A finite element model of the integrated system is developed and subjected to scaled acceleration time histories recorded during two different real earthquakes. Dynamic analysis is performed using mode superposition method of transient analysis. A parametric study is conducted to investigate the effect of flexibility of soil in the dynamic behaviour of low-rise building frames. The time histories and Fourier spectra of roof displacement, base shear and structural response quantities of the space frame on compliant base are presented and compared with the fixed base condition. Results indicate that the incorporation of soil flexibility is required for the realistic estimate of structural seismic response especially for single storey structures resting on very soft soil.
Seismic response analysis of reinforced concrete frames including soil flexibility
B.R. Jayalekshmi,V.G. Deepthi Poojary,Katta Venkataramana,R. Shivashankar 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.48 No.1
The seismic response of RC space frame structures with isolated footing resting on a shallow soil stratum on rock is presented in this paper. Homogeneous soil stratum of different stiffness in the very soft to stiff range is considered. Soil, footing and super structure are considered to be the parts of an integral system. A finite element model of the integrated system is developed and subjected to scaled acceleration time histories recorded during two different real earthquakes. Dynamic analysis is performed using mode superposition method of transient analysis. A parametric study is conducted to investigate the effect of flexibility of soil in the dynamic behaviour of low- rise building frames. The time histories and Fourier spectra of roof displacement, base shear and structural response quantities of the space frame on compliant base are presented and compared with the fixed base condition. Results indicate that the incorporation of soil flexibility is required for the realistic estimate of structural seismic response especially for single storey structures resting on very soft soil.
Synthesis and Antimicrobial Activity of 1,2,3-Triazoles Containing Quinoline Moiety
V. Sumangala,N. Chidananda,Jennifer Fernandes,N. Suchetha Kumari,Boja Poojary 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.12
A new series of substituted 1,2,3-triazoles (4a-n) were synthesized from 4-azido-2,8-bistrifluoromethylquinoline 2. The 1,3-dipolar cycloaddition reaction of 2 with ethyl acetoacetate afforded 1-(2,8-Bistrifluoromethylquinolin-4-yl)-5-methyl-1,2,3-triazole-4-carboxylic acid 3, which was then converted into its corresponding acid hydrazide 3a. Condensation of this hydrazide with different aromatic aldehydes resulted in the formation of Schiff’s bases, N-[1-Arylmethylene]-1-[2,8-bistrifluoromethylquinoline-4-yl]-5-methyl-1H-1,2,3-triazole-4-carbohydrazides (4a-n). These newly synthesized 1,2,3-triazole derivatives were characterized by analytical and spectral data. All the synthesized compounds were evaluated in vitro for their antibacterial and antifungal activity. A brief investigation of the structure activity relationships revealed that the nature of the substituent on position 4 of the triazole ring influences the antimicrobial activity. Among the newly synthesized compounds, the most active compound was 4n, which contained the 3-methylthien-2-yl moiety and showed a broad spectrum of antimicrobial activity against all the strains used for testing. Compounds 4b, 4c, 4e, 4f, 4h and 4l showed significant antimicrobial activity at the concentration of 6.25 μg/mL.
R-ORTHOGONALITY OF LATIN SQUARES USING BIVARIATE PERMUTATION POLYNOMIALS
VADIRAJA BHATTA G. R.,SHANKAR B. R.,PRASANNA POOJARY 장전수학회 2022 Proceedings of the Jangjeon mathematical society Vol.25 No.2
Cryptographic applications of Latin squares require to study them in various aspects. In this paper, the formation and observation of Latin squares using bivariate permutation polynomials over some finite rings are established with respect to their properties like self orthogonalization, r-orthogonalization, and r- mirror orthogonalization. We also identified why some particular cases fail to form self orthogonal Latin squares, and we illustrate it by giving examples.
B. Adil,K. M. Shankar,B. T. Naveen Kumar,Rajreddy Patil,Abhiman Ballyaya,K. S. Ramesh,Sathish Rama Poojary,Omkar V. Byadgi,Prabhugouda Siriyappagouder 대한수의학회 2013 Journal of Veterinary Science Vol.14 No.4
A monoclonal antibody-based flow-through immunoassay (FTA) was developed using a nitrocellulose membrane placed on the top of adsorbent pads enclosed in a plastic cassette with a test zone at the center. The FTA could be completed within 10 min. Clear purple dots against a white background indicated the presence of Aphanomyces (A.)invadans. The FTA limit of detection was 7 μg/mL for A. invadans compared to 56 μg/mL for the immunodot. FTA and polymerase chain reaction (PCR) could detect A. invadans in fish tissue homogenates at a 10-11 dilution compared to a 10-8 dilution by immunodot. In fish suffering from natural cases of epizootic ulcerative syndrome (EUS)collected from Mangalore, India, FTA and PCR could detect A. invadans in 100% of the samples compared to 89.04%detected by immunodot. FTA reagents were stable and produced expected results for 4 months when stored at 4∼8oC. This rapid test could serve as simple and cost-effective on-site screening tool to detect A. invadans in fish from EUS outbreak areas and in ports during the shipment of live or frozen fish.