204 research outputs found
Fiber design for high-power low-cost Yb:Al-doped fiber laser operating at 980nm
No full textWe investigated an Yb:Al-doped depressed-clad hollow optical fiber (DCHOF) for cladding-pumped 980nm laser operation. With a careful design, the nonzero fundamental-mode cutoff characteristics of a DCHOF allows the competing 1030-1060nm emission to be filtered out, despite being quite close to 980nm. The laser yielded over 3W of output power in a diffraction limited beam (M -parameter degrades to 2.7, as a result of increased cladding-mode lasing, as the cladding thickness is reduced
Ultimate Bearing Capacity of Strip Footing on Clay Soil Under Eccentric Inclined Load
No full textThe foundations supporting the structures around us are not always subjected to a staticload which is centric vertical in nature.When two or more forces act on the foundation simultaneously, generally the resultantof those forces actsin a way other than centric vertical on the foundation. The resultant may act inclined at the center (centric inclined),eccentrically and eccentrically inclined on the foundation.Retaining walls,structures at coastal area are some of the examples where the aforementioned resultant acts on the foundation.
In the present study, a numerical approach has been made using finite element model tool Plaxis2D to study the ultimate bearing capacity of shallow strip foundation resting on clay, subjected to an eccentricand inclined load. Four different types of soils have been considered in the current study i.e. very soft clay, soft clay, medium stiff clay and stiff clay. Finite element model approach, using reasonable intensity of triangular mess has been made to observe the bearing capacity responsefor a range of load eccentricity 0-0.15 @0.05 and a range of load inclination [email protected] depthof footing is varied from [email protected]. From the databaseof the present study,an empirical equation has been proposed using regression analysis, for estimating the reduction factor(the factor by which the ultimate bearing capacity for the centricvertical load is reduced) when eccentric and inclined loads are concerned. Furthermore, comparison of outcomes from the numerical study with those of Meyerhof (1963) suggests good agreements between both the studies except eccentric condition
E-Journal of Chemistry from 2007 to 2012: A Bibliometric Study
No full textBibliometric research is a complex area to comprehend and to undertake in which one might expect information about the intricacies of identifying data for a bibliometric study, discussion about what that data means when it has been extracted, as well as details about the assumptions and limitations researchers face when working in the field, will need to consult an alternative source (Haddow, 2010). Now-a-days, bibliometric studies are conducted for a given field of knowledge on specific literature, research output of a prolific author, research productivity of an organization or of an individual journal for a specific range of time. The present study attempts to unfold the publication characteristics of E-Journal of Chemistry which is published by World Wide Web Publications (P) India from the USA
Radiation Hardness of Undoped BGO Crystals
No full textWe measured the radiation hardness of undoped BGO crystals from two different manufacturers. Such crystals are proposed to be used in a small angle calorimeter of the BELLE detector of the KEK B-factory. Transparency and scintillation light output of the crystals were monitored to see the effect of radiation damage. The crystals show considerable radiation hardness up to 10.2 MRad equivalent dose, which is much higher than the maximum expected dosage of 500 kRad per year of running at BELLE. Submitted to NIM-A. y Corresponding author; Present address : University of Hawaii, Honolulu, HI 96822, U.S.A.; [email protected] 1 Introduction Bismuth Germanate (Bi 4 Ge 3 O 12 ) crystals, commonly known as BGO, have been extensively used for electromagnetic calorimetry in high energy physics experiments[1]. Advantages of BGO are its excellent e=fl energy resolution (0.3 -- 1 %/ q (E(GeV )), high density, short radiation length, large refractive index, suitable scintillating properties(f..
Editorial Introduction
No full textPoet, professor, critic and folklorist Nandini Sahu is one of the most important figures in contemporary Indian writing in English. The sky-high number of her readers, making her the Amazon’s bestselling author for 2022, is a testimony to the sea-deep quality of her works. A professor by profession, a poet by essentiality, and a folklorist to the core, Nandini Sahu has touched the life and soul of many, in many ways. Her poetic output, one after the other, showed us new lights in which to see truth––an unfabricated truth
Measurement of Radiation Damage on an Optical Reflector
No full textWe measured the radiation damage on an optical white fluorocarbon reflector called Goretex which is to be used for aerogel threshold counters and crystal calorimeters of the BELLE detector of the KEK B-factory. Reflectance of the Goretex surface was monitored to see any effect of the radiation damage. Maximum equivalent dose was 8.6 MRad. No radiation damage is observed within measurement errors. 1 Introduction Sheets of white fluorocarbon reflectors, generically named as teflons, are extensively used in high energy particle physics experiments for wrapping a Submitted to NIM-A y Internet address: [email protected] z Internet address: [email protected] (Corresponding author) range of optical detectors such as scintillating plastics, crystals and aerogel Cerenkov detectors. Such reflectors have high reflectance, and help contain the light in the detecting volume, thus increasing the number of photons collected. With the advent of high luminosity particle accelerato..
High-resolution extreme ultraviolet spectroscopy of G191-B2B: structure of the stellar photosphere and the surrounding interstellar medium
No full textWe have continued our detailed analysis of the high-resolution (R= 4000) spectroscopic observation of the DA white dwarf G191-B2B, obtained by the Joint Astrophysical Plasmadynamic Experiment (J-PEX) normal incidence sounding rocket-borne telescope, comparing the observed data with theoretical predictions for both homogeneous and stratified atmosphere structures. We find that the former models give the best agreement over the narrow waveband covered by J-PEX, in conflict with what is expected from previous studies of the lower resolution but broader wavelength coverage Extreme Ultraviolet Explorer spectra. We discuss the possible limitations of the atomic data and our understanding of the stellar atmospheres that might give rise to this inconsistency. In our earlier study, we obtained an unusually high ionization fraction for the ionized He ii present along the line of sight to the star. In the present paper, we obtain a better fit when we assume, as suggested by Space Telescope Imaging Spectrograph results, that this He ii resides in two separate components. When one of these is assigned to the local interstellar cloud, the implied He ionization fraction is consistent with measurements along other lines of sight. However, the resolving power and signal-to-noise available from the instrument configuration used in this first successful J-PEX flight are not sufficient to clearly identify and prove the existence of the two components
Molecular design and theoretical characterization of benzodithiophene based organic photovoltaic materials
No full textSettlement of Surface Strip Foundation Resting on Soft Clay Subjected to Vertical Cyclic Load
No full textA view on thermodynamics of concentrated electrolytes: Modification necessity for electrostatic contribution of osmotic coefficient
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