Flexural Behaviour of Steel-Foam Concrete Composite Light-Weight Panels

Prabha, P.,Palani G. S.,Lakshmanan N.,Senthil R. 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9

The present study explores the applicability of composite panel made of thin profiled steel sheets of thickness 0.8 mm as the outer skins with an infill Light-weight Foam Concrete (LFC) core of density 1200 kg/m3 for use as floor/roof panel in buildings by conducting experimental studies. This study was carried out in continuation with the previous studies reported by Prabha et al. (2013) on composite wall panels. Through-through mild steel connectors were used for the load transfer between sheet and concrete. Two types of concrete core, namely (a) Normal Foam Concrete (NFC) and (b) Fibre Reinforced Foam Concrete (FRFC) were investigated. The polypropylene fibres were used for improving the tensile strength of LFC. The composite panels exhibit gradual load-deflection response and ductile failure mode at higher deflections under four point bending test. The ultimate load of FRFC specimen is found to be 6% stronger than NFC panels, which implies that the use of polypropylene fibers marginally improved the flexural strength. The panels possess sufficient flexural capacity for spans upto 5 m and high ductility factor of 10 to be used as floor/ roof panels in residential buildings. Numerical parametric studies indicate that the configuration 24 nos. of studs used in the experiment is found to be optimal and the flexural capacity increases proportionally for the higher thickness of steel sheet. Simplified equation is proposed for the evaluation of flexural strength of the panel.

Study on polyester resin concrete for applications in chemical & power plant industry

S. Lavanya Prabha,M. Surendar,G. Prabha,A. Mohan 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.5

Polyester polymer resin concrete is a type of concrete that incorporates polyester polymer resins as a binder instead oftraditional cement. In this study, concrete was made using three resins: vinyl ester resin, superior vinyl ester resin, andbisphenolresin. The ingredients of polyester polymer resin concrete are three types of polyester resin, 1-2% of Methyl ethylketone peroxide (MEKP) as the catalyst, Cobalt Octoate as the Accelerator and N, N-dimethylaniline as the promoter of 1%is used to make the binding resin. Along with binding resin calcium carbonate as filler and fine aggregate (normal riversand)passing through 2.36 mm sieve and retained on 600-micron sieve and course aggregate of size 6mm were used to make theconcrete. 36 trail batches were carried out for preliminary investigation targeting a compressive strength of 70 MPa. Theshortlisted batches were taken for detailed investigation on mechanical and durability properties. The stress strain behaviourisstudied and dynamic modulus,poisons ratio is calculated with various correlative equations for mechanical properties. Thedurability properties of the resin concrete were assessed as per ACI 515.2R-13 [1966] for the acid and base solutions. Byimmersing the samples in three diluted acids and two alkaline media, such as 10% sulphuric acid, 10% nitric acid, 10%hydrochloric acid, 10% sodium sulphate, and 10% magnesium sulphate, the durability property is assessed. Variations incompressive strength, mass, and the look of the submerged samples, among other variables, have been studied and it foundthat the Vinyl ester resin concrete possesses a higher acid resistance property.

A large thymic mass with persistent active tissue in an elderly cadaver

Prabhas Ranjan Tripathy,Binita Chaudhary,Manisha Rajanand Gaikwad,Neethinathan Jacques Britto 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.1

Thymus is an encapsulated organ having its bilateral origin from the third pharyngeal pouch. It appears to be a single organ but actually it is bilobed. It attains its maximum development at puberty and then it begins to involute. The parenchyma is replaced by adipocytes and lymphocyte production declines. Here we present a large thymus with a small area of persistent active tissue in it which was obtained during routine undergraduate dissection class. Tissues taken from different quadrants of the large thymic mass were processed, embedded in paraffin and sections were taken for hematoxylin and eosin staining which showed presence of thymic tissue in only one quadrant. Further sections from that quadrant was treated with cytokeratin to confirm its epithelial origin. Therefore knowledge of a large persistent thymus will be helpful to the radiologists and surgeons for making differential diagnosis and in avoiding unnecessary surgical intervention.

W. B. Yeats’s Poetic Self and Indian Philosophy

Prabha Shankar Dwivedi 한국예이츠학회 2019 한국예이츠 저널 Vol.58 No.-

The paper examines the impact of Indian philosophy and literature on Yeats and his poetry surveying his interactions and involvement with the Indian men. Yeats’s interest in Indian philosophical thoughts can well be understood by looking at his strong relations with three Indians, Mohini Chatterjee, Shri Purohit Swami, and Rabindranath Tagore, whose contributions in the shaping of his self are well documented by Yeats himself in many of his writings including his Autobiographies. Yeats’s A Vision very clearly shows his reception of Indic mysticism under the influence of Indian theosophist Mohini Chatterjee, recounting how he first met him and Indian philosophy in his Autobiographies. Yeats notes in his introduction to Gitanjali that Rabindranath Tagore’s prose translations of Bengali poems stirred his blood as nothing did for years. Yeats’s poems, such as “Anashuya and Vijaya,” “The Indian Upon God,” “The Indian to his Love,” “Meru” demonstrate an influence of Indic knowledge system, and there is also a strong undercurrent of Indian philosophy in much of his prose work.

Perceptions of team-based learning using the Team-Based Learning Student Assessment Instrument: an exploratory analysis amongst pharmacy and biomedical students in the United Kingdom

Prabha Parthasarathy,Bugewa Apampa,Andrea Manfrin 한국보건의료인국가시험원 2019 보건의료교육평가 Vol.16 No.-

PurposeThis study aimed to evaluate students’ perception of team-based learning (TBL) amongst a cohort exposed to this methodology for the first time at a university in the United Kingdom. MethodsBetween November and December 2018, 26 first-year Master of Pharmacy and 90 second-year Biomedical Science students of the School of Life Sciences, University of Sussex, United Kingdom were invited to participate and requested to complete a questionnaire that contained quantitative and qualitative questions. The quantitative component was based on the Team-Based Learning Student Assessment Instrument (TBL-SAI). It additionally contained questions about key student characteristics. ResultsThe response rate was 60% (70 of 116); of the participants, 74% (n=52) were females and 26% (n=18) males. The percentage of agreement in the TBL-SAI suggested a favourable response to TBL. The overall mean score for the TBL-SAI was 115.6 (standard deviation, 5.6; maximum score, 140), which was above the threshold of 102, thus suggesting a preference for TBL. Statistically significant differences were not found according to demographic characteristics. Students who predicted a final grade of ≥70% strongly agreed that TBL helped improve their grades. Some students highlighted issues with working in teams, and only 56% of students agreed that they could learn better in a team setting. ConclusionThis study shows that students exposed to TBL for the first time favoured several aspects of TBL. However, more focused strategies including team-building activities and expert facilitation skills could potentially tackle resistance to working in teams.

Creating innovative mental health nursing learning experiences for students through simulation: An action research carried out at a public university in Oman

Blessy Prabha Valsaraj,Divya KY,Mohammed Qutishat,Koukab Al Gharibi 한국간호과학회 2023 한국간호과학회 학술대회 Vol.2023 No.11

Raspberry derived mesoporous carbon-tubules and fixed-bed adsorption of pharmaceutical drugs

Shashi Prabha Dubey,권영남,이창하,Amarendra Dhar Dwivedi,Mika Sillanpaa,Lena Q. Ma 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3

Novel mesoporous carbon-tubules were prepared from wild plant leaves of Rubus idaeus (Raspberry) andtheir physicochemical characteristics were analyzed by spectroscopic and potentiometric titrationmethods. The developed carbon-tubules were applied for the aqueous phase decontamination of threepharmaceutical drugs. Ibuprofen, naproxen and clofibric acid were selected for the study. Batch andfixed-bed studies were performed to investigate the adsorption of selected pharmaceutical drugs. Mathematical modelings were applied to the experimental data in order to estimate the maximumadsorption capacity and evaluate the characteristics of the fixed-bed. Based on finding, the adsorptionmechanism was investigated by adsorbate and adsorbent physicochemical characteristics.

An improved polynomial model for top -and seat- angle connection

P. Prabha,V. Marimuthu,S. Arul Jayachandran,S. Seetharaman,N. Raman 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.5

The design provisions for semi-rigid steel frames have been incorporated in codes of practice for steel structures. In order to do the same, it is necessary to know the experimental moment-relative rotation (M-θr) behaviour of beam-to-column connections. In spite of numerous publications and collection of several connection databases, there is no unified approach for the semi-rigid design of steel frames. Amongst the many connection models available, the Frye-Morris polynomial model, with its limitations reported in the literature, is simple to adopt at least for the linear design space. However this model requires more number of connection tests and regression analyses to make it a realistic prediction model. In this paper, 3D nonlinear finite element (FE) analysis of beam-column connection specimens, carried out using ABAQUS software, for evaluating the M-θr behaviour of semi-rigid top and seat-angle (TSA) bolted connections are described. The finite element model is validated against experimental behaviour of the same connection with regard to their moment-rotation behaviour, stress distribution and mode of failure of the connections. The calibrated FE model is used to evaluate the performance of the Frye-Morris polynomial model. The results of the numerical parametric studies carried out using the validated FE model have been used in proposing modifications to the Frye-Morris model for TSA connection in terms of the powers of the size parameters.

Fluid Structure Interaction Analysis of a Centrifugal Compressor with Impeller Back Side Cavity

Manu Prabha Anand,Seongweon Hong,Jaemun Lee,Abhilash Suryan,Heuy Dong Kim 한국전산유체공학회 2022 한국전산유체공학회 학술대회논문집 Vol.2022 No.10

Synthesis and characterization of metal-doped reduced graphene oxide composites, and their application in removal of Escherichia coli, arsenic and 4-nitrophenol

Shashi Prabha Dubey,권영남,Thuy T.M. Nguyen,이창하 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-

The aim of the present study is to synthesize dispersible reduced graphene oxide (RGO) viafunctionalization with metals and metal oxides and explore their potential applications in waterpurification. Graphene-based metal and metal oxide composites were synthesized hydrothermally usingsodium borohydride as a reducing agent and sodium sorbate as a stabilizer. Single (Ag, Cu2O, and Fe3O4)and bimetallic (Ag-Cu2O, Ag-Fe3O4, and Cu2O-Fe3O4) nanoparticles were incorporated on the surface ofRGO. The synthesized composites were characterized by various analytical methods. The inactivation ofE. coli, the catalytic degradation of 4-nitrophenol, and the adsorption of As(V) were examined using theRGO composites.