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Experimental study on behaviors of polypropylene fibrous concrete beams

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第7期8卷 1101-1109页

作者： SUJI D. NATESAN S. c. MUrUGESAN r. Sathyabama Institute of Science and Technology Chennai Tamil Nadu India VLB Janakiammal College of Engineering and Technology Coimbatore Tamil Nadu India Gojan School of Business and Technology Red Hills Chennai Tamil Nadu India

Synthetic fibers made from nylon or polypropylene have gained application when loose and woven into geo textile form although no information on the matrix’s mechanical performance is obtained so that more understanding of their structural contribution to resist cracking can be determined. This paper presents the results of an experimental investigation to determine the performance characteristics of concrete reinforced with a polypropylene structural fiber. In this investigation “Fiber mesh” brand of fibers manufactured by SL concrete System, Tennessee, USA and marketed by M/S Millennium Building System, Inc., Ban-galore, India are used. The lengths of the fibers used were 24 mm. Fiber dosages used were 0.9, 1.8, 2.7 kg/m3. A total of three mixtures, one for each fiber dosage were made. A standard slump cone test was conducted on the fresh concrete mix with and without fibers to determine the workability of the mix. The test program included the evaluation of hardened concrete properties such as compressive, split tensile, modulus of rupture and flexural strengths. The increase in compressive strength is about 36.25%, 26.20%, and 23.75% respectively that of plain concrete. This increase in strength was directly proportional to amount of fibers present in the mix. The increase in flexural strength for Mixes I^III is about 21%, 16.6%, and 23% respectively that of plain concrete specimens. An experimental investigation was also made to study the behaviors of reinforced fibers concrete beams (with longitudinal reinforcements) under two-point loading. The deflection and crack patterns were also studied. The improvements in strength and ductility characteristics were discussed.

关键词： Fiber reinforcement concrete Mechanical properties Polypropylene Fibre reinforced concrete (PFrc)

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Diversity of Gasteromycetes in rajasthan,India-I

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Studies in Fungi 2021年第1期6卷 175-187页

作者： chouhan r Panwar c S.S Jain Subodh PG(Autonomous)college JaipurRajasthanIndia Jai Narain Vyas University JodhpurRajasthanIndia

In this paper,taxonomic descriptions of eight members of Gasteromycetes belonging to Montagnea,Phellorinia,Podaxis and Tulostoma are *** four Podaxis species described,Podaxis africana,*** and *** are new records for *** herculeana *** and *** *** are also described herein while *** *** is a new record for *** descriptions of Montagnea haussknechtii and Tulostoma brumale reveal new insights into the rare species of Gasteromycetes confined to arid and semi-arid areas worldwide while *** is a new record for India.

关键词： edible mushrooms Montagnea Phellorinia Podaxis Tulostoma

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Diversity of Gasteromycetes in rajasthan,India-Ⅱ

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Studies in Fungi 2021年第1期6卷 352-364页

作者： chouhan r Panwar c S.S Jain Subodh PG(Autonomous)college JaipurRajasthanIndia Jai Narain Vyas University JodhpurRajasthanIndia

In an attempt to elucidate the gasteromycetes flora of the State of rajasthan,India,extensive mycofloristic surveys were carried out to record the occurrence of diverse fungi on a wide range of substrates,habitats and environment *** descriptions of six species of gasteromycetes resulted from the surveys are presented herein *** limosa,***,Pisolithus albus,***,Scleroderma bovista and *** the taxa are new records for rajasthan.

关键词： ectomycorrhizal edible fungi gleba peridium spores

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Joint MAP channel estimation and data detection for OFDM in presence of phase noise from free running and phase locked loop oscillator

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Digital communications and Networks 2021年第1期7卷 55-61页

作者： Kamayani Shrivastav r.P.Yadav K.c.Jain Department of Electronics and communication Malaviya National Institute of Technology302017India Department of Matiiematics Indian Institute of Information TechnologyKotaIndia

This paper addresses a computationally compact and statistically optimal joint Maximum a Posteriori(MAP)algorithm for channel estimation and data detection in the presence of Phase Noise(PHN)in iterative Orthogonal Frequency Division Multiplexing(OFDM)receivers used for high speed and high spectral efficient wireless communication *** MAP cost function for joint estimation and detection is derived and optimized further with the proposed cyclic gradient descent optimization *** proposed joint estimation and detection algorithm relaxes the restriction of small PHN assumptions and utilizes the prior statistical knowledge of PHN spectral components to produce a statistically optimal *** frequency-domain estimation of channel Transfer Function(cTF)in frequency selective fading makes the method simpler,compared with the estimation of channel Impulse response(cIr)in the time *** different time-varying PHN models,produced by Free running Oscillator(FrO)and Phase-Locked Loop(PLL)oscillator,are presented and compared for performance difference with proposed OFDM *** results for joint MAP channel estimation are compared with cramer-rao Lower Bound(crLB),and the simulation results for joint MAP data detection are compared with“NO PHN"performance to demonstrate that the proposed joint MAP estimation and detection algorithm achieve near-optimum performance even under multipath channel fading.

关键词： Orthogonal frequency division multiplexing Phase noise Free running oscillator Phase-locked loop oscillator Maximum a posteriori channel estimation Data detection

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Spatio-temporal variation and propagation direction of coal fire in Jharia coalfield,India by satellite-based multi-temporal night-time land surface temperature imaging

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International Journal of Mining Science and Technology 2021年第5期31卷 765-778页

作者： Narendra Singh r.S.chatterjee Dheeraj Kumar D.c.Panigrahi Department of Mining Engineering Indian Institute of Technology(Indian School of Mines)Dhanbad 826004India Geosciences Department Indian Institute of Remote SensingDehradun 248001India

In this paper,the spatio-temporal variation and propagation direction of coal fire were studied in the Jharia coalfield(JcF),India during 2006–2015 through satellite-based night-time land surface temperature(LST)*** LST was retrieved from Advanced Spaceborne Thermal Emission and reflection radiometer(ASTEr)night-time thermal-infrared data by a robust split-window algorithm based on scene-specific regression coefficients,band-specific hybrid emissivity,and night-time atmospheric *** LST-profile-based coal fire detection algorithm was formulated through statistical analysis of the LST values along multiple transects across diverse coal fire locations in the JcF in order to compute date-specific threshold temperatures for separating thermally-anomalous and background *** algorithm efficiently separates surface fire,subsurface fire,and thermally-anomalous transitional *** the observation period,it was noticed that the coal fire area increased significantly,which resulted from new coal fire at many places owing to extensive opencast-mining *** was observed that the fire propagation occurred primarily along the dip direction of the coal *** places,lateral-propagation of limited spatial extent was also observed along the strike direction possibly due to spatial continuity of the coal seams along ***,the opencast-mining activities carried out during 2009–2015 and the structurally weak planes facilitated the fire propagation.

关键词： Satellite-based night-time imaging Land surface temperature coal fire Spatio-temporal variation Propagation direction Jharia coalfield

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Innovative approaches towards an economic fusion reactor

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National Science review 2020年第2期7卷 245-247页

作者： Houyang Guo Francis Y c Thio Michl W Binderbauer richard J Buttery Thomas r Jarboe rajesh Maingi John S Sarff Peter c Stangeby Derek A SutherlAND Mickey r Wade Michael c Zarnstorff General Atomics Breakthrough Fusion International corporation

Nuclear fusion potentially offers a clean,environmentally friendly and intrinsically safe energy source with an abundant fuel supply. Magnetic fusion energy research is approaching a new era of fusion power reactor design and construction planning. New physics understanding and powerful predictive tools have become available for improving fusion performance, developing and optimizing various magnetic confinement concepts. Emerging transformative

关键词： Innovative approaches towards an economic fusion reactor

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Effect of cadmium on the Hatching ofMetaphire posthuma cocoons

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Biomedical and Environmental Sciences 1999年第1期12卷 50-53页

作者： S·K·GUPTA r·c·MUrTHY 等 IndustrialToxicologyresearchcentre

Earthworms are considered ideal soil organisms for use in terrestrial ecotoxicology. Due to theirsusceptibility of heavy metals, the effect of cadmium on the hatching of M. posthuma cocoons wasstudied. The hatching was observed by the water incubation method and the doses of cd were 0,1.25, 2.5, 5.0, 10.0 and 40.0ppm. The0 and 1.25 ppm treated cocoons hatched within 45-60 days at 20℃ with 80% hatching rate and one juvenile per cocoon; no hatching was observed athigher concentrations. Furihermore, there was a linear increase in cd residue in the treated co-coons. These results are apparently ill effects of cd on embryonic development of the earthworms

关键词： Animals cadmium Oligochaeta Soil Pollutants

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Microglial activation and adult neurogenesis after brain stroke

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Neural regeneration research 2021年第3期16卷 456-459页

作者： Ijair r.c.dos Santos Michelle Nerissa c.Dias Walace Gomes-Leal Laboratory of Experimental Neuroprotection and Neuroregeneration Institute of Biological SciencesFederal University of Pará-BrazilBelém-ParáBrazil

The discovery that new neurons are produced in some regions of the adult mammalian brain is a paradigm-shift in neuroscience *** new-born cells are produced from neuroprogenitors mainly in the subventricular zone at the margin of the lateral ventricle,subgranular zone in the hippocampal dentate gyrus and in the striatum,a component of the basal ganglia,even in *** the human hippocampus,neuroblasts are produced even in *** regulation of adult neurogenesis is a complex phenomenon involving a multitude of molecules,neurotransmitters and soluble factors released by different sources including glial ***,the resident macrophages of the central nervous system,are considered to play an important role on the regulation of adult neurogenesis both in physiological and pathological *** stroke and other acute neural disorders,there is an increase in the numbers of neuroblast production in the neurogenic *** activation is believed to display both beneficial and detrimental role on adult neurogenesis after stroke,depending on the activation level and brain *** this article,we review the scientific evidence addressing the role of microglial activation on adult neurogenesis after ischemia.A comprehensive understanding of the microglial role after stroke and other neural disorders it is an important step for development of future therapies based on manipulation of adult neurogenesis.

关键词： adult neurogenesis hippocampus ischemia microglia neuroinflammation neuroprotection stroke subventricular zone therapy

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An Extended chaboche's Viscoplastic Law at Finite Strains: Theoretical and Numerical Aspects

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Journal of Materials Science & Technology 2005年第2期21卷 145-147页

作者： r.c.Lin W.Brocks Institute for Materials research GKSS research centre Max-Planck-Street D-21502 Geesthacht GermanyInstitute for Materials Research GKSS Research Centre Max-Planck-Street D-21502 Geesthacht Germany

This paper presents a newly extended chaboche’s viscoplastic law at finite strains, so that the classical chaboche’s theories can be applied to the physical and numerical simulation of metals processing and behavior description of spatial metal structures. The extension is based on a new dissipation inequality at finite strains. The evolution equations are formulated in terms of the corotational rates of the logarithmic elastic strain and the strain-like internal variable conjugate to the back stress as well as the material time derivative of the accumulated plastic strain. The stress equation is expressed on the hyperelastic theory. Therefore, the possible inconsistency with elasticity, caused by the hypoelastic equations, is completely removed. A set of numerical examples with finite deformations are presented to prove the effectivities of the new model and numerical algorithms.

关键词： Viscoplastic law Dissipation inequality Finite strain

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Scalable Methods for Device Patterning as an Outstanding challenge in Translating Paper-Based Microfluidics from the Academic Benchtop to the Point-of-care

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Journal of Analysis and Testing 2019年第1期3卷 50-60页

作者： Jessica c.Brooks charles r.Mace Department of chemistry Tufts UniversityMedfordMA 02155USA

Paper-based microfluidic devices offer unparalleled adaptability for the development of low-cost,point-of-care analytical *** potential for these devices to drastically improve access to healthcare around the globe is obvious,but very few tests have found success in clinical ***,we identify manufacturing-specifically,methods to pattern paper devices at large scales-as a major barrier to translating prototype paper-based devices from the academic benchtop to the *** introduce current methods used to pattern papers and discuss their utility as means to prototype and manufacture paper-based devices.

关键词： Paper-based microfluidics μPAD Point-of-care Diagnostics Manufacturing

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