34,405 research outputs found
Transverse Momentum Distribution and Elliptic Flow of Charged Hadrons in + collisions at GeV using HYDJET++
Recent experimental observations of the charged hadron properties in
collisions at GeV contradict many of the theoretical models of particle
production including two-component Monte Carlo Glauber model. The experimental
results show a small correlation between the charged hadron properties and the
initial geometrical configurations (e.g. body-body, tip-tip etc.) of
collisions. In this article, we have modified the Monte Carlo HYDJET++ model to
study the charged hadron production in collisions at GeV
center-of-mass energy in tip-tip and body-body initial configurations. We have
modified the hard as well as soft production processes to make this model
suitable for collisions. We have calculated the pseudorapidity
distribution, transverse momentum distribution and elliptic flow distribution
of charged hadrons with different control parameters in various geometrical
configurations possible for collision. We find that HYDJET++ model
supports a small correlation between the various properties of charged hadrons
and the initial geometrical configurations of collision. Further, the
results obtained in modified HYDJET++ model regarding and
elliptic flow () suitably matches with the experimental data of
collisions in minimum bias configuration.Comment: 29 pages, 25 figures. Accepted for Publication in EPJ
Effects of drip and alternate furrow method of irrigation on cotton yield and physical water productivity: A case study from farmers’ field of Bhavnagar district of Gujarat, India
With the growing irrigation water scarcity, the researchers and policymakers are more concerned to improve the irrigation water use efficiency at farmers’ field level. The water-saving technologies provide greater control over water delivery to the crop root zone and reduce the non-beneficial evaporation from the crop field. Water productivity is an important concept for measuring and comparing water use efficiency. The present study tried to estimate the irrigation water use and physical water productivity of cotton under alternate furrow and drip irrigation methods in the Bhavnagar district of Gujarat. Results suggest that crop yield and physical water productivity were higher for cotton irrigated by drip method than alternate furrow method during normal rainfall and drought year. The irrigation water use under the drip method of irrigation was lower as compared to the alternate furrow method. In the case of total water (effective rainfall + irrigation water) use, per hectare crop yield and physical water productivity were higher for the drip method of irrigation than the alternate furrow method of irrigating cotton crop during normal rainfall and drought year. In the case of total water use (effective rainfall + irrigation water), it was lower for drip irrigation than the alternate furrow method of irrigating cotton crop during normal rainfall year and drought year. While estimating total water (effective rainfall + irrigation water) use, it was assumed that there is no return flow of water from the cotton field in the study area under both irrigation methods
Diesel price hikes and farmer distress: the myth and the reality
FuelsDiesel oilPricesFarmers attitudesPumpingCostsGroundwater irrigationWellsOwnershipEconomic impactWater productivityFarm incomeMilk production
Electronic Structure, Local Moments and Transport in Fe_2VAl
Local spin density approximation calculations are used to elucidate
electronic and magnetic properties of Heusler structure Fe_2VAl. The compound
is found to be a low carrier density semimetal. The Fermi surface has small
hole pockets derived from a triply degenerate Fe derived state at Gamma
compensated by an V derived electron pocket at the X point. The ideal compound
is found to be stable against ferromagnetism. Fe impurities on V sites,
however, behave as local moments. Because of the separation of the hole and
electron pockets the RKKY interaction between such local moments should be
rapidly oscillating on the scale of its decay, leading to the likelihood of
spin-glass behavior for moderate concentrations of Fe on V sites. These
features are discussed in relation to experimental observations of an unusual
insulating state in this compound.Comment: 16 pages, RevTeX, 5 figure
Bank seasoned equity offers: do voluntary and involuntary offers differ?
Recent research has shown that for industrial and utilities’ seasoned equity offers (SEOs) the offer price discount is informative and has significant price effects. We examine whether the offer price discount for SEOs made by undercapitalized banks is different from those made by banks that were already overcapitalized prior to issue announcement. The former are labeled "involuntary" issues, and the latter "voluntary." Voluntary issues are likely made by opportunistic managers at times when their stock is overvalued. Prior research has argued and provided evidence suggesting that for involuntary issues, such timing discretion may be limited. However, we find no significant differences in the issue-date discount, and in issue-date abnormal returns between the two types of issues. We find that trading volume increases dramatically at the offer date, stays at abnormally high levels over a 60-day post–issue period, and is accompanied by a positive abnormal return in the post-offer period for both types of issues.Bank stocks
Universal Freezeout Condition for Charged Hadrons in a Hybrid Approach
Hadronic freezeout during the evolution of the medium created in heavy-ion
collisions is an important phenomena. It is quite useful to find a universal
freezeout condition for each and every nuclear collisions. In this article, we
have constructed a hybrid model to calculate the ratio of transverse energy to
total mean multiplicity , since this ratio can possibly act as a
freezeout condition in heavy-ion collision experiments. Present hybrid model
blends two approaches : Tsallis statistics and wounded quark approach.
Recently, Tsallis statistics has been reliably used to obtain the transverse
momentum distribution of charged hadrons produced in relativistic ion
collisions. On the other side it has been shown that the pseudorapidity
distribution of charged hadrons can be calculated satisfactorily using the
wounded quark model (WQM). We have used this hybrid model to calculate the
transverse energy density distributions, at midrapidity using
charged particle pseudorapidity distributions, and mean
transverse momentum in various type of nuclear
collisions. We found that present hybrid model satisfactorily explains the
experimental data whether other models fail to reproduce the data at central
and at peripheral collisions simultaneously. Finally, ratio of transverse
energy to total mean multiplicity, has been computed within
hybrid model and compared with the available experimental data at RHIC and LHC
energies. We observed no explicit dependence of on energy as
well as centrality and thus it can definitely act as a freezeout criteria.Comment: 27 pages, 18 figures, 2 Tables, Accepted in EPJ
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