34,790 research outputs found
Improved source of infrared radiation for spectroscopy
Radiation from a crimped V-groove in the electrically heated metallic element of a high-resolution infrared spectrometer is more intense than that from plane areas adjacent to the element. Radiation from the vee and the flat was compared by alternately focusing on the entrance slit of a spectrograph
Groundwater externalities of surface irrigation transfers under National River Linking Project: Polavaram – Vijayawada link
River basin managementRiver basin developmentDevelopment projectsWater transferIrrigation canalsGroundwater irrigationTube well irrigationRiceSurface irrigationCrop managementSoil salinityWaterlogging
Enhancing productivity of water under variable climate
Crop productionMaizeClimateRainFamersDecision making
Enhancing productivity of water under variable climate
Irrigated farmingProductivityCrop productionMaizeSimulation modelsClimateForecasting
The lower Krishna Basin trajectory: relationships between basin development and downstream environmental degradation
River basin development / Lakes / Environmental degradation / Ecosystems / Mangroves / Water allocation / Groundwater / Water quality / Salinity / Irrigated farming / Institutions / Irrigation canals / Rural development
Low radio frequency signatures of ram pressure stripping in Virgo spiral NGC 4254
We report the detection of extended low radio frequency continuum emission
beyond the optical disk of the spiral galaxy NGC 4254 using the Giant Metrewave
Radio Telescope. NGC 4254, which has an almost face-on orientation, is located
in the outskirts of the Virgo cluster. Since such extended emission is uncommon
in low inclination galaxies, we believe it is a signature of magnetised plasma
pushed out of the disk by ram pressure of the intracluster medium as NGC 4254
falls into the Virgo cluster. The detailed spectral index distribution across
NGC 4254 shows that the steepest spectrum alpha < -1 (S propto nu^{alpha})
arises in the gas beyond the optical disk. This lends support to the ram
pressure scenario by indicating that the extended emission is not from the disk
gas but from matter which has been stripped by ram pressure. The steeper
spectrum of the extended emission is reminiscent of haloes in edge-on galaxies.
The sharp fall in intensity and enhanced polarization in the south of the
galaxy, in addition to enhanced star formation reported by others provide
evidence towards the efficacy of ram pressure on this galaxy. HI 21cm
observations show that the gas in the north lags in rotation and hence is
likely the atomic gas which is carried along with the wind. NGC 4254 is a
particularly strong radio emitter with a power of 7x10^{22} Watts/Hz at 240
MHz. We find that the integrated spectrum of the galaxy flattens at lower
frequencies and is well explained by an injection spectrum with
alpha_0=-0.45+-0.12. We end by comparing published simulation results with our
data and conclude that ram pressure stripping is likely to be a significant
contributor to evolution of galaxies residing in X-ray poor groups and cluster
outskirts.Comment: 10 pages, 7 figures (figures 1,2 and 4 are in jpg format) and 2
tables; Accepted for publication in MNRA
Geometry of good sets in n-fold Cartesian product
We propose here a multidimensional generalisation of the notion of link
introduced in our previous papers and we discuss some consequences for
simplicial measures and sums of function algebras.Comment: 17 pages, no figures, no table
Performance Evaluation of the Indigenous Commercial Flotation Columns for Zinc Cleaning at Rajpura Dariba Plant of HZL in Rajasthan
Hindustan Zinc limited operates a Pb-Zn beneficiation plant having a capacity of around 3000 tpd at Rajpura Dariba mine. The beneficiation circuit consists of 3 parallel streams each of 800 tpd capacity and produces lead and zinc concentrates. The ore from this mine is reported to be complex in nature. The sulphides of lead-zinc from this deposit are hosted by calc-silicate (CS) and graphite mica schist (GSM) rock types. The extreme variability of the physicochemical properties of the ore and wide variations in the grade of mill feed created
metallurgical problems due to which the desired products could not be obtained on sustained basis
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