Modal parametric changes in a steel bridge with retrofitting

Suresh Kumar Walia,Hemant Kumar Vinayak,Ashok Kumar,Raman Parti 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.19 No.2

This paper presents the status improvement of an old damaged deck type rural road steel truss bridge through the modal parametric study after partial retrofitting. The dynamic and static tests on bridge were carried out as in damaged state and after partial retrofitting. The dynamic testing on the steel bridge was carried out using accelerometers under similar environmental conditions with same speed of the moving vehicle. The comparison of the modal parameters i.e., frequency, mode shape mode shape curvature, modal strain energy, along with the deflection parameter are studied with respect to structural analytical model parameters. The status up gradation for the upper and downstream truss obtained was different due to differential level of damage in the bridge. Also after retrofitting the structural elemental behavior obtained was not same as desired. The damage level obtained through static tests carried out using total station indicated further retrofitting requirement.

Propagation of plane waves in an orthotropic magneto-thermodiffusive rotating half-space

Suresh Kumar Sheokand,Rajesh Kumar,Kapil Kumar Kalkal,Sunita Deswal 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.72 No.4

The present article is aimed at studying the reflection phenomena of plane waves in a homogeneous, orthotropic, initially stressed magneto-thermoelastic rotating medium with diffusion. The enuciation is applied to generalized thermoelasticity based on Lord-Shulman theory. There exist four coupled waves, namely, quasi-longitudinal P-wave (qP), quasi-longitudinal thermal wave (qT), quasi-longitudinal mass diffusive wave (qMD) and quasi-transverse wave (qSV) in the medium. The amplitude and energy ratios for these reflected waves are derived and the numerical computations have been carried out with the help of MATLAB programming. The effects of rotation, initial stress, magnetic and diffusion parameters on the amplitude ratios are depicted graphically. The expressions of energy ratios have also been obtained in explicit form and are shown graphically as functions of angle of incidence. It has been verified that during reflection phenomena, the sum of energy ratios is equal to unity at each angle of incidence. Effect of anisotropy is also depicted on velocities of various reflected waves.

Aloe trinervis sp. nov.: A new succulent species from Indian Desert (Asphodelaceae)

Suresh Kumar,C.S. Purohit,Ravikiran N. Kulloli 국립중앙과학관 2020 Journal of Asia-Pacific Biodiversity Vol.13 No.2

A new species of Aloe from the Indian Desert, India, is described and illustrated as Aloe trinervis sp. nov. The new species shows similarity with Aloe vera in having succulent, rosette leaves, persistent bracts, freetepals, and six stamens but differs in the recurved teeth instead of deltoid teeth on the leaf margins, 3-nerved bracts, branched and taller inflorescences (90e95 cm long), longer flowers of 31e34 mm inlength, flowers with a pale green color being brownish at middle, and longer stamens (29e33 mm). Adetailed description with data on its distribution and relevant taxonomic notes, comparative morphological,and color photo plate are provided for easy identification of the proposed new species, A. trinervisin relation to A. vera.

Generation of local wind pressure coefficients for the design of low building roofs

Kumar, K. Suresh,Stathopoulos, Ted Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.6

This paper presents recent research on the experimental evaluation of wind loads on low buildings and the recommendations provided in the form of traditional codification. These mainly include the wind loads on buildings with geometries different from those examined in previous studies. This is followed by the evaluation of simulated wind loads on low building roofs. The overall application of a recently proposed simulation methodology for codification purposes is discussed in detail. The traditional codification provides for a group of roof geometries a single peak design pressure coefficient for each roof zone considering a nominal worst-case scenario; this may often lead to uneconomical loads. Alternatively, the presented methodology is capable of providing peak pressure coefficients corresponding to specific roof geometries and according to risk levels; this can generate risk consistent and more economical design wind loads for specific roof configurations taking into account, for instance, directional design conditions and upstream roughnesses.

Experimental strategy for acid-free plutonium recovery from assorted matrices: Non-aqueous leaching followed by selective solid phase extraction

Kumar Shiny Suresh,Rao Ankita,Srivastava Ashutosh,Yadav Kartikey Kumar,Lenka Raja Kishore 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.11

Methodologies comprising usage of innocuous reagents, lower overall chemical inventory and simplification of process scheme for plutonium recovery from assorted matrices, solid as well as liquid, are key to establishing sustainability of the nuclear fuel cycle. The present study demonstrates, for the first-time, plutonium leaching from different refractory matrices: oxide, mixed oxide as well as simulated cellulosic waste using the benign halide anion free choline citrate - urea (1 : 2 mole ratio) based eutectic solvent (referred to as CU). This mineral acid and hydrofluoric acid-free, non-aqueous route of plutonium recovery with controlled infra-red heating yielded ≥93% efficiency. CU was diluted with biodegradable, less viscous propylene glycol (referred to as PG), which was chosen as the non-aqueous polar phase for facile solid phase extraction (SPE), which is a green alternative to liquid-liquid extraction owing to process simplification and solvent inventory reduction. Exclusive stabilization of tetravalent plutonium in the novel media, confirmed by ultraviolet-visible spectrophotometry and electrochemical methods, led to process simplification, eliminating any pre-extraction requirement for oxidation state adjustment. Extractant, di-2-ethyl hexyl phosphoric acid encapsulated polyether sulfone beads, prepared by phase inversion method, were employed for efficient SPE of plutonium (Distribution co-efficient, kD=950±6). Selectivity of non-aqueous SPE was found to be Pu(IV)≫UO 2+ 2 >Am(III) vis-à-vis aqueous acid medium.

Pressure equalization of rainscreen facades: Analysis of the field data in the frequency domain

Kumar, K. Suresh,Wisse, J.A. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.2

This paper reports the field measurements concerning pressure equalization of rainscreen facades carried out at the Technical University of Eindhoven (TUE) in the Netherlands. The field facility including the details of test panel, meteorological tower, instrumentation, data collection and analysis is presented. Results of investigations into cavity response for various leakage and venting configurations are discussed. Frequency domain techniques have been utilized to show the influence of wind as well as facade characteristics on the pressure equalization performance. Further, this paper presents an early attempt to synthesize the experimental results into existing building codes.

Double-Layer Antireflection Coating of MgF2 SiNx for Crystalline Silicon Solar Cells

Suresh Kumar Dhungel,이준신,JINSU Yoo,김경해,SOMNATH GHOSH,정성욱 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3

Single layer antireflection coatings are not able to cover a broad range of the solar spectrum. This research investigated changes in the performance parameters of crystalline silicon solar cells caused by a thin film of magnesium fluoride (MgF2) deposited on top of a silicon nitride (SiNx) film already deposited on the emitter layer of a solar cell. The MgF2 film depositions on crystalline cells of large area (125 mm × 125 mm) were carried out by using thermal evaporation under high vacuum ( 10−6 Torr) with a special mask to protect the front metal contact on the busbars after cell fabrication. Significant improvements in the conversion eciency (E) and the short-circuit current (Isc) of the cells were obtained after deposition of the MgF2 layer. Comparison of the unscaled quantum eciencies (QE) before and after MgF2 deposition showed a significant improvement in spectral response, especially in the wavelength range above 700 nm. The theoretical reflectance of the surface with a double-layer antireflection (DLAR) coating, as obtained by simulation, was found to be in agreement with the experimentally measured surface reflectance pattern. Single and multicrystalline silicon solar cells with respective conversion eciencies of 17 and 16 % were fabricated with a conventional solar cell fabrication line.

On the Breeding of “CSR18${\times}$CSR19”- A Robust Bivoltine Hybrid of Silkworm, Bombyx mori L. for the Tropics

Kumar, N.Suresh,Basavaraja, H.K.,Kumar, C.M.Kishor,Reddy, N.Mal,Datta, R.K. Korean Society of Sericultural Science 2002 International Journal of Industrial Entomology Vol.5 No.2

Earlier breeding experiments undertaken at Central Sericultural Research and Training Institute, Mysore, India since a decade had resulted in the development of many productive and qualitatively superior bivoltine hybrids. However, the hot climatic conditions of tropics prevailing particularly in summer are not conducive to rear these high yielding bivoltine hybrids. This has necessitated breeding of compatible bivoltine hybrids for year-round rearing. Accordingly, the Japanese hybrid, B2Ol ${\times}$ BCS12 which was found to be tolerant to high temperature was used as breeding resource material. Following hybridization and selection rearing of silkworms was taken up in SERICATRON (Environmental chamber with precise and automatic control facilities for uniform maintenance of temperature and humidity) at high temperature of $36{\times}1^{\circ}C$ and 85${\times}$5% RH in fifth instar and the control batches at $25{\times}1^{\circ}C$ and 65{\times}$5% RH. Directional selection was resorted to the batches reared at 36$\pm$1$^{\circ}C$ till F$_{5}$ keeping pupation rate as important selection criteria. From $F_{2}% onwards the experiment was modified in such a way as to conduct normal rearing every alternate generation to regain the lost vitality due to continuous exposure to high temperature and high humidity stress. At $F_{2}$ , Oval and dumb-bell cocoons were separated out and designated as CSR18 and CSR19, respectively. By utilizing these lines at $F_{12}$, the hybrid CSR18$\times$CSR19 was prepared and studied for the thermotolerance by subjecting to stress condition at high temperature of 36$\pm$1$^{\circ}C$ and 85$\pm$5% RH in fifth instar and the control batches at $25{\times}1^{\circ}C$ and 65${\times}$5% RH. The better performance of CSR18${\times}$CSR19 (survival > 88%) at $36{\times}1^{\circ}C$ clearly indicates the general superiority of CSR18${\times}$CSR19 with regard to high temperature tolerance over the productive hybrids and CSR18$\times$CSR19 can perform well in varied agro-climatic conditions of the tropics with optimum qualitative and quantitative characteristics.s.

Studies on the Effect of High Temperature on Fl Hybrids Between Polyvoltine and Bivoltine Silkworm Races of Bombyx mori L.

Kumar, N.Suresh,Yamamoto, T.,Basavaraja, H.K.,Datta, R.K. Korean Society of Sericultural Science 2001 International Journal of Industrial Entomology Vol.2 No.2

In order to introduce bivoltine races in a tropical country like India, it is necessary to have stability in cocoon crop under high temperature environments. Unlike any temperate country like Japan, the rearing conditions/environment, climatic conditions, quality of mulberry leaf and incidence of diseases are unpredictable in India. Geneticists and breeders of all the sericultural countries have experienced the influence of environment during the process of breeding. in order to select efficiently the breeds with high temperature tolerance, it is verb important to analyse clearly the heritability nature of high temperature tolerance. In light of the above, the present study was undertaken to determine the effect of high temperature treatment of (A) $35{\pm}1^{\circ}C$ and 85${\pm}$5% RH for 24 hrs continuously, (B) $35{\pm}1^{\circ}C$ and 85${\pm}$5% RH for 48 hrs continuously and (C) the control (25${\pm}1^{\circ}$ and 65${\pm}$5% RH in the normal rearing condition from the $3^{rd}of5^{th}$ instar on the pure races such as Moria, Nl37 and Cl46 as well as their Fl hybrids. The overall performance indicate that the hybrids are mare tolerant than the pure races. it was also observed that the overall performance declined in those batches where 48 hrs treatment was given. The most interesting observation noticed in this study was that there was maternal effect regarding temperature tolerance as evident from the better performance of those hybrids where the female parent used was more tolerant as pure race.

Pre clinical studies of $Streblus$ $asper$ Lour in terms of behavioural safety and toxicity

Kumar, R.B. Suresh,Puratchikodi, A.,Prasanna, Angelene,Dolai, Narayan,Majumder, Piyali,Mazumder, U.K.,Haldar, P.K. 경희한의학연구센터 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.4

$Streblus$ $asper$ Lour (Family: Moraceae) is a medicinal plant wildly grows in most part of Asian countries. It has many traditional uses like leprosy, piles, diarrhoea, dysentery, elephantiasis, cancer etc. This present study was relates in terms of behavioural safety and toxicity studies of methanol and petroleum ether extracts of $S.$ $asper$. Brine Shrimps lethality bioassay method was established for the present study and cytotoxicity was reported in terms of 50% lethality concentration ($LC_{50}$). Different concentrations of drug solutions were added to the Brine Shrimps, surviving shrimps were counted after 24 h and 50% lethality concentration ($LC_{50}$) were assessed. Acute toxicity was studied on Swiss albino mice after single dose. Sub-Chronic toxicity was performed for 28 days and assessed with biochemical and histopathological parameters. On cytotoxicity studies of brine shrimps it was found methanol extract of $S.$ $asper$ (MESA) was weakly toxic, may be due to the presence of cardiac glycosides and bioactive compounds, however petroleum ether extract of $S.$ $asper$ (PESA) was non toxic. But, in case of acute and sub-acute toxicity study both extracts were found to be non-toxic.