686 research outputs found
Three dimensional geometrical and material nonlinear finite element analysis of adhesively bonded joints for marine structures
No full textThe use of adhesive bonding as a structural joining method has been gaining recognition in marine industry in recent years, though it has been widely adopted in other fields such as aerospace, automobiles, trains and in civil constructions. The type of materials used and design practices followed in marine structures are different from what is applied in other disciplines. Therefore new research approaches are required and recent novel ideas are explored in the context of application of bonded joint configurations in marine environment.The research is directed at developing analysis tools for predicting the displacement, stress and strain fields in adhesively bonded joints between dissimilar adherends. In the finite element formulation, the adherends may be isotropic or orthotropic layered materials, which are assumed to behave linear elastically. The adhesive material is assumed to behave as elasto-plastic continuum, where the nonlinear behaviour is modelled as either a rigid or a semi-rigid adhesive solid that can be represented by the Ramberg-Osgood material model. The yield behaviour of the polymeric adhesive is modelled using a modified von Mises criterion, which accounts for the fact that plastic yielding of polymer materials may occur under the action of hydrostatic as well as deviatoric stresses. The geometric nonlinearity is based on the assumption of large displacement, large rotation but small strain, and it is implemented in the code using the total Lagrangian approach.The scheme is applied on three case studies viz.: a study of adherend imbalances in a single lap joint, stress analysis of a butt-strap joint system and a hybrid joint are undertaken. The influence of geometric and material nonlinearity on joint deformations and adhesive stresses, are studied for a single lap joint with dissimilar adherends, aluminium and a Fibre Reinforced plastic composite material, with varying adhrend thickness ratios. The adhesive stress-strain data obtained from the model are compared with the experimental stress-strain curve and the numerical results are validated with the analytical solution. Three dimensional effects like ’anticlastic’ and bending-twisting’ are shown in the joint with a dissimilar adherends. Key results are obtained that explains the state of nonlinear adhesive stress state in the joint.Analysis of butt-strap joint focussed on nonlinear modelling of a semi-rigid adhesive material that is used to bond two dissimilar adherends, steel and aluminium. The analysis demonstrate that the influence of geometric and material nonlinearity on the joint deformations as well as the adhesive stresses is significant. Nonlinear adhesive stresses are compared with the actual strength of the highly flexible adhesive, highlighting the need for the consideration of material nonlinearity in the bonded joints. Failure modes for the joint are inferred from the observations made on the adhesive stress state in the butt-strap joint.Last study, deals with three dimensional analysis of a GRP-Steel hybrid joint carried out to model the initiation and propagation of crack under a set of static loading cases. Earlier studies were restricted only to two dimensional analysis. This three dimensional analysis showed that the adhesive normal stress is not constant across the width of the joint. Critical locations of stress concentrations are identified and the failure mechanisms are compared with the experimental specimens.The observations made from this research study using a three dimensional finite element program, compliments the present knowledge in the field of adhesively bonded joints
Video Haze Removal And Poisson Blending Based Mini-Mosaics For Wide Area Motion Imagery
No full textThis poster is related to the following paper:
R. Aktar, V. B. S. Prasath, H. Aliakbarpour, U. Sampathkumar, G. Seetharaman, K. Palaniappan. Video Haze Removal And Poisson Blending Based Mini-Mosaics For Wide Area Motion Imagery. IEEE Applied Imagery Pattern Recognition (AIPR), Washington DC, USA.</p
Reconstruction of a graph of order p from its (p-1)-complements
No full textLet G = (V, E) be a graph of order p greater than or equal to 2, and P = (V-1, V-2,...,V-p-1) be a partition of V of order p-1. The (p-1)-complement G((p-1))(P) of G is obtained as follows: For all V-i and V-j in P, i not equal j, remove the edges between V-i and V-j, and add the missing edges between them. Disconnected graphs, trees, bipartite graphs and unicyclic graphs are reconstructible from the collection of all their (p-1)-complements
Computerized microvasculature dura mater structure extraction and analysis of fluorescence microscopy imagery
No full textPoster from:
V. B. S. Prasath, R. Pelapur, Y. M. Kassim, S. Meena, A. Palaniappan, U. Sampathkumar, O. Glinskii, V. Glinskii, V. Huxley, K. Palaniappan. Computerized Microvasculature Dura Mater Structure Extraction and Analysis of Fluorescence Microscopy Imagery. Missouri Informatics Symposium, April 2016.</p
Antihyperlipidemic and antiatherogenic activities of Terminalia pallida Linn. fruits in high fat diet-induced hyperlipidemic rats
No full textHyperlipidemia contributes significantly in the manifestation and development of atherosclerosis and coronary heart disease (CHD). Although synthetic lipid-lowering drugs are useful in treating hyperlipidemia, there are number of adverse effects. So the current interest has stimulated the search for new lipid-lowering agents with minimal side effects from natural sources. The present study was designed to investigate the antihyperlipidemic and antiatherogenic potentiality of ethanolic extract of Terminalia pallida fruits in high fat diet-induced hyperlipidemic rats. T. pallida fruits ethanolic extract (TPEt) was prepared using Soxhlet apparatus. Sprague-Dawley male rats were made hyperlipidemic by giving high fat diet, supplied by NIN (National Institute of Nutrition), Hyderabad, India. TPEt was administered in a dose of 100 mg/kg.b.w./day for 30 days in high fat diet-induced hyperlipidemic rats. The body weights, plasma lipid, and lipoprotein levels were measured before and after the treatment. TPEt showed significant antihyperlipidemic and antiatherogenic activities as evidenced by significant decrease in plasma total cholesterol, triglycerides, low-density lipoprotein cholesterol, and very low-density lipoprotein cholesterol levels coupled together with elevation of high-density lipoprotein cholesterol levels and diminution of atherogenic index in high fat diet-induced hyperlipidemic rats. There was a significantly reduced body weight gain in TPEt-treated hyperlipidemic rats than in the control group. The present study demonstrates that TPEt possesses significant antihyperlipidemic and antiatherogenic properties, thus suggesting its beneficial effect in the treatment of cardiovascular diseases
Signed Graph Equation
No full textFor standard terminology and notion in graph theory we refer the reader to Harary [7]; the non-standard will be given in this paper as and when required. We treat only finite simple graphs without self loops and isolates
Proof of a conjecture in domination theory
No full textAbstractA dominating set D of a graph G is a least dominating set (l.d.s) if γ(〈D〉) ⩽ γ(〈D1〉) for any dominating set D1 (γ denotes domination number). The least domination number γ1(G) of G is the minimum cardinality of a l.d.s. We prove a conjecture of Sampathkumar (1990) that γ1 ⩽ 3p5 for any connected graph G of order p ⩾ 2
Rhene rubrigera Simon 1889
No full textRhene rubrigera Simon, 1889 Figs 57–64, 72 Homalattus rubriger Thorell, 1887: 347 (D ♂). Rhene rubigera Żabka, 1985: 444, figs 544–562 (♂ ♀). Rhene rubrigera Sen et al., 2015: 30, figs 67–71, pl. 12 (♀). Material. INDIA: Karnataka; 1 ♀, Bhairapura (13.01956°N, 75.57277°E), 983 m a.s.l., 06.03.2021, leg. A.P.C. Abhijith & P. Ramachandra; Kerala: 1 ♀ (RTC), Wayanad, Valad (11.8046°N, 75.9253°E), 800 m a.s.l., 18.10.2021, leg. A. Jose; Uttarakhand: 1 ♀ (RTC), Dehradun (30.28313°N, 77.97427°E), 598 m a.s.l., 15.07.2017, leg. R. Tripathi; West Bengal: 1 ♂ (NZC-ZSI 6859/18), Tardaha (22.4591°N, 88.5218°E), 7 m a.s.l., 26.04.2019, leg. K. Valarmathi & party. Distribution. India (Karnataka, Kerala, Nicobar Islands, Uttarakhand, West Bengal (Caleb, 2019; 2020; present data) to Vietnam, China, Taiwan, Indonesia (Sumatra) (WSC, 2022) (Fig. 72).Published as part of Caleb, John T. D., Sanap, Rajesh V., Tripathi, Rishikesh, Sampathkumar, M., Dharmaraj, Jayaraman & Packiam, Soosaimanickam Maria, 2022, Taxonomic notes on some South and Southeast Asian members of the genus Rhene Thorell, 1869 (Aranei, Salticidae, Dendryphantini), pp. 389-407 in Zootaxa 5125 (4) on pages 402-403, DOI: 10.11646/zootaxa.5125.4.3, http://zenodo.org/record/645090
Rhene flavigera
No full textRhene flavigera (C.L. Koch, 1846) Figs 5–35, 72 Rhanis flavigera C. L. Koch, 1846: 14: 86, fig. 1340 (D ♂). Rhene flavigera Prószyński, 1984: 119–121 (♂, D ♀); Żabka, 1985: 443, figs 541–543 (♀). Rhene rubrigera Prószyński, 1984: 121 (♀ from Burma (now Myanmar), misidentified). Rhene danieli Tikader, 1973: 71, figs 5–9 (D ♂); holotype ♂ in NZC-ZSI, examined; syn. n. Rhene indicus Tikader, 1973: 68, figs 1–4 (D ♂ ♀); holotype ♀, allotype ♂ and paratypes ♀♀, in NZC-ZSI, examined; syn. n. Rhene khandalaensis Tikader, 1977: 274, figs 1–3 (D ♀); holotype ♀, not examined; syn. n. Zygoballus citri Sadana, 1991: 73, figs 1–6 (D ♂ ♀); holotype ♀ & paratypes ♂ ♀, repository unknown, not examined; syn. n. Rhene sanghrakshiti Gajbe, 2004: 137, figs 184–186 (D ♀); holotype ♀, in NZC-ZSI, examined; syn. n. For a complete list of taxonomic references see WSC (2022). Types. Rhene danieli Tikader, 1973: Holotype ♂ (NZC-ZSI) from INDIA, Maharashtra, Bombay (presently Mumbai), Borivili (= Borivali), 16.08.1972, leg. J.C. Daniel (Note: There were two males in the same vial. The bigger one is taken as the holotype as it fits with the body measurements and illustrations provided in the original description). Rhene khandalaensis Tikader, 1977: Holotype ♀ (NZC-ZSI) from INDIA, Maharashtra, Poona (presently Pune) Distr., Khandala, 9.11.1963, leg. B.K. Tikader (specimen could not be traced in the ZSI collections). Rhene sanghrakshiti Gajbe, 2004: Holotype ♀ (NZC-ZSI) from INDIA, Madhya Pradesh, Jabalpur, Garha, 14.08.1997, leg. P. Gajbe. Rhene indica Tikader, 1973: Holotype ♀ (NZC-ZSI) from INDIA, Punjab, Ludhiana, the Punjab Agricultural University compound, 17.02.1972, leg. G.L. Sadana. Allotype ♂ and Paratypes (2 ♀♀), together with the holotype. Zygoballus citri Sadana, 1991: Holotype ♀ from INDIA, Punjab, Ludhiana, the Punjab Agricultural University, 12.12.1989, leg. G.L. Sadana. Allotype ♂ and Paratypes (4 ♀♀ and 3 ♂♂), together with the holotype (author mentioned that the types will be deposited in NZC-ZSI but they could not be traced in the ZSI collections). Comparative material. Rhene flavigera (C.L. Koch, 1846) from MALAYSIA: 1 ♂, 1 ♀ (MMUE, G7572.22409), Selangor Province, Banting, 100 m a.s.l., leg. W. Corley, 14 Nov 1982, det. J.A. Murphy (1990); 1 ♂, 4 ♀♀ (MMUE, G7572.14465), W. Pahang Province, Genting, 700 m a.s.l., leg. J. Murphy & F. Murphy, 01 Feb 1988, det. J.A. Murphy (1991); 2 ♂♂, 2 ♀♀ (MMUE, G7572.18303), W. Pahang Province, Genting, 600 m a.s.l., leg. J. Murphy & F. Murphy, 26 Nov 1990, det. J.A. Murphy (1991). Other material. INDIA: Kerala: 1 ♂ (RTC), Irinjalakuda (10.34137°N, 76.19612°E), 6 m a.s.l., 01.10.2021, leg. R. Tripathi; 1 ♂ (RTC), Kerala, Wayanad, Valliyoorkavu (11.8043°N, 76.0305°E) 736 m a.s.l., 18.10.2021, leg. A. Jose; Maharashtra: 2 ♂♂, 3 ♀♀ (RVSC), Mumbai, Aarey Milk Colony (19.1425°N, 72.8674°E), 37 m a.s.l., 27.07.2017, leg. R. Sanap; Tamil Nadu: 1 ♂ (JDC), Nilgiri Distr., (11.3266°N, 76.6255°E), 1994 m a.s.l., 15.11.2020, leg. J. Dharmaraj; 1 ♀ (NBAIR-NIM-SPI-24F/19) & 1 ♂ (NBAIR-NIM-SPI-24M/19), Ooty, Muthorai, from tea ecosystem (11.387111°N, 76.670806°E), 2133 m a.s.l., 24.09.2019, leg. M. Sampathkumar; Karnataka: 3 ♀♀ (NBAIR-NIM-SPI-25F/21) & 1 ♂ (NBAIR-NIM-SPI-25M/21), Bengaluru, Atturu, from Okra ecosystem (13.096889°N, 77.568139°E), 934 m a.s.l., 19.03.2021, leg. M. Sampathkumar; 1 ♂ (NBAIR-NIM-SPI-24M/20), Bengaluru, Hesaraghatta, from pomegranate ecosystem (13.131278°N, 77.492167°E), 858 m a.s.l., 24.09.2020, leg. M. Sampathkumar. Comments. Rhene danieli Tikader, 1973 was originally described from a holotype male collected from Mumbai (erstwhile Bombay), Maharashtra (Tikader, 1973) and later recorded from other localities in West Bengal (Tikader & Biswas, 1981; Roy et al., 2016). A detailed examination of the male specimens revealed that its abdominal colour pattern and the palpal morphology are identical to those of R. flavigera (cf. Figs 5–10 with illustrations in Prószyński (1984: 119) and fig. 52 in Maddison (1996)). It is therefore safe to conclude that this species is a junior synonym of R. flavigera. Rhene khandalaensis Tikader, 1977 was described from Khandala, Maharashtra based on a female holotype and four female paratypes (Tikader, 1977). The types were not available and may have been either misplaced in the collection or lost. However, the original illustrations, though not so detailed, helped to recognize the species. The colour pattern of the abdomen is identical with that of R. flavigera and the epigyne with oval openings and median epigynal pocket and the internal structures with mid-portion of insemination ducts running parallel close to each other and the convoluted spermathecae (cf. figs 1–3 in Tikader (1977) with illustrations in Prószyński (1984: 120, 121), figs 541, 542 in Żabka (1985) and Figs 12–16 herein). R. khandalaensis is therefore regarded as a junior synonym of R. flavigera. Rhene sanghrakshiti Gajbe, 2004 was described based on a female holotype from Garha, Jabalpur, Madhya Pradesh (Gajbe, 2004). Detailed examination of the holotype revealed that the abdominal colour pattern and the female genitalia with large oval copulatory openings, median epigynal pocket and convoluted spermathecae match clearly with that of R. flavigera (cf. Figs 12–16 with illustrations in Prószyński (1984: 120) and figs 541, 542 in Żabka (1985)). Based on the above observations, it is safe to conclude that the species is a junior synonym of R. flavigera. Rhene indica and Rhene citri were both described from the same type locality—the Punjab Agriculture University, Ludhiana. Although the type material of R. citri was not available for the study, we could examine the type specimens of R. indica from the same locality. The palpal morphology of the single (allotype) male of R. indica could not be studied in detail as both palps were missing but the original illustration of the palp is identical to R. flavigera (cf. Figs 9 & 29 with fig. 2 in Tikader, 1973). However, the colour pattern agrees with that of R. flavigera (cf. Figs 18, 19, 21–24 with illustrations in Prószyński (1984: 121)). The epigyne of both R. indica and R. citri with ovoid epigynal openings and a median epigynal pocket unambiguously match with the epigyne of R. flavigera (cf. Fig. 20 and fig. 2 in Sadana (1991) with illustrations in Prószyński (1984: 120, 121)). Based on the general morphology and copulatory organs there remains no doubt that both species are indeed junior synonyms of R. flavigera. The relation of R. flavigera and R. albigera based on all available illustrations and the original descriptions point that both species names are synonyms having been described in the same work and both were described from single males collected from the same locality, Bintang (C.L. Koch, 1846). The name R. flavigera (on p. 86) would be valid as it precedes R. albigera (on p. 87) in the original publication (C.L. Koch, 1846). A formal synonymize is not done here as the corresponding types are to be studied. Distribution. Pakistan, China, Vietnam to Indonesia (Sumatra) (WSC, 2022), India (Karnataka, Kerala, Madhya Pradesh, Maharashtra, Punjab, Tamil Nadu) (Fig. 72).Published as part of Caleb, John T. D., Sanap, Rajesh V., Tripathi, Rishikesh, Sampathkumar, M., Dharmaraj, Jayaraman & Packiam, Soosaimanickam Maria, 2022, Taxonomic notes on some South and Southeast Asian members of the genus Rhene Thorell, 1869 (Aranei, Salticidae, Dendryphantini), pp. 389-407 in Zootaxa 5125 (4) on pages 392-398, DOI: 10.11646/zootaxa.5125.4.3, http://zenodo.org/record/645090
A study on status of neonatal transport to a level III neonatal intensive care unit
No full textBackground: In the past decade, great advancements in Neonatal care contributed to a fall in IMR. A further fall in IMR can only be achieved by improving the neonatal transport facilities. Hence to assess the current status of neonatal transport we undertook this study.Methods: This is a cross-sectional study of 75 neonates transported to our NICU. For all the babies, data regarding the place of birth, mode of delivery, mode of transport, etc. were collected. On admission parameters like blood glucose, temperature, CRT, SPO2, the presence of cyanosis, shock was assessed.Results: In the present study 64% of neonates came to our NICU on their conveyance. 67% of referrals from PHCs did not utilize ambulance facility. 30% of neonates had hypothermia on arrival. 35%had hypoglycemia on arrival. 15% had a low oxygen saturation on arrival. 15% had prolonged CRT on arrival. Only 8% of neonates received prior treatment. 11% babies did not have any referral slip. Only a very few had complete and proper referral advice.Conclusions: To further reduce the neonatal mortality rate, the neonatal transport facilities should be upgraded. A standard protocol should be formulated for interfacility transport. A separate fleet of neonatal ambulances well equipped and manned by trained personnel is the need of the hour.</jats:p
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