8,300 research outputs found
Inclusive hadron and photon production at LHC in dipole momentum space
Using a momentum space model for the dipole scattering amplitude we present
an analysis of the saturation effects at LHC energies, describing the data on
proton-proton and proton-lead collisions. The model is based on the asymptotic
solutions of the Balitsky-Kovchegov equation, being ideal in the saturation
domain where the target wave function has a high occupation number. We also
make predictions for the nuclear modification ratios on charged hadron and
prompt photon production in the forward region, where the high parton density
effects are important.Comment: New section added and typos corrected. To be published in PR
A comparison of efficient permutation tests for unbalanced ANOVA in two by two designs--and their behavior under heteroscedasticity
We compare different permutation tests and some parametric counterparts that
are applicable to unbalanced designs in two by two designs. First the different
approaches are shortly summarized. Then we investigate the behavior of the
tests in a simulation study. A special focus is on the behavior of the tests
under heteroscedastic variances.Comment: 20 pages, 9 figures, Working Paper of the Department of Management
And Enigineering of the University of Padov
Techno-Economic Analysis of Dimethyl Ether Biofuel Production Plant Based on Sewage Sludge Gasification
Bio-dimethyl ether (bio-DME) is an environmentally friendly alternative fuel for diesel engines that has several advantages over conventional fossil diesel fuel, such as lower emissions of particulate matter, hydrocarbons, carbon monoxide, and nitrogen oxides. The purpose of this paper is to perform a techno-economic analysis of a novel bio-DME production plant based on sewage sludge gasification. The first part of the work is centred around the modelling of a fixed bed, updraft gasification reactor, which is performed using a multi-scale, multiphase methodology already tested and validated on biomass feedstock using the GasDS suite, a property package developed at Politecnico di Milano. The gas-solid kinetic model is coupled with a detailed gas-phase kinetic scheme including more than 200 species, and more than 2,000 reactions. The work then illustrates a new process scheme that undergoes techno-economic and sensitivity analyses to understand the most impacting parameters on the feasibility of the process. This procedure is useful to understand if sludge gasification could be considered as an alternative feedstock and a viable option for the future development of a sustainable supply chain for the production of bio-DME. The obtained results are promising, showing productivity of 19.3 kg/h of fuel-grade bio-DME from 100 kg/h of hydrochar with a market-competitive production cost ranging from -0.370 and 0.924 âŹ/kgDME, and an average value of 0.277 âŹ/kgDME
Direct calorimetric measurements of isothermal entropy change on single crystal W-type hexaferrites at the spin reorientation transition
We report on the magnetic field induced isothermal entropy change, \Delta
s(Ha, T), of W-type ferrite with CoZn substitution. Entropy measurements are
performed by direct calorimetry. Single crystals of the composition
BaCoZnFeO, prepared by the flux method, are measured at
different fixed temperatures under an applied field perpendicular and parallel
to the c axis. At 296 K one deduces a value of K = 8.7 \times 10^{4} J
m for the first anisotropy constant, which is in good agreement with the
literature. The spin reorientation transition temperature is estimated to take
place between 200 and 220 K
Is demagnetization an efficient optimization method?
Demagnetization, commonly employed to study ferromagnets, has been proposed
as the basis for an optimization tool, a method to find the ground state of a
disordered system. Here we present a detailed comparison between the ground
state and the demagnetized state in the random field Ising model, combing exact
results in and numerical solutions in . We show that there are
important differences between the two states that persist in the thermodynamic
limit and thus conclude that AC demagnetization is not an efficient
optimization method.Comment: 2 pages, 1 figur
European Museums in the 21st Century: Setting the Framework (3 Voll.)
This book grew out of the earliest work of the MeLa Research Field 6, âEnvisioning 21st Century Museums,â aimed at exploring current trends in European contemporary museums. Analysing their ongoing evolution triggered by this âage of migrationsâ and with specific attention to their architecture and exhibition design, the volume collects the preliminary observations ensuing from this survey, complemented by the some paradigmatic examples, and further enriched by interviews and contributions from scholars, curators and museum practitioners.
With contributions by Florence BalĂ€en, Michela Bassanelli, Luca Basso Peressut, Joachim Baur, Lorraine Bluche, Marco Borsotti, Mariella Brenna, Anna Chiara Cimoli, Lars De Jaegher, Maria Camilla De Palma, Hugues De Varine, Maria De Waele, NĂ©lia Dias, Simone Eick, Fabienne Galangau QuĂ©rat, Sarah Gamaire, Jan Gerchow, Marc-Olivier Gonset, Klas Grinell, Laurence Isnard, Marie-Paule Jungblut, Galitt Kenan, Francesca Lanz, JosĂ© MarĂa Lanzarote Guiral, Vito Lattanzi, Jack Lohman, Carolina Martinelli, Frauke Miera, Elena Montanari, Chantal Mouffe, Judith Pargamin, Giovanni Pinna, Camilla Pagani, Clelia Pozzi, Paolo Rosa, Anna Seiderer
Effect of Hyperbaric Storage at Room Temperature on the Activity of Polyphenoloxidase in Model Systems and Fresh Apple Juice
The effect of hyperbaric storage (HS) on polyphenoloxidase activity (PPO) was studied in model solutions and apple juice. Model solutions containing increasing amounts of mushroom (Agaricus bisporus) PPO (up to 26 U) were stored at room temperature at pressure up to 200Â MPa. During HS, samples were assessed for residual PPO activity. The enzyme was completely inactivated according to a first-order kinetic model that was used to calculate PPO decimal reduction time (Dp) and pressure sensitivity (zp = 140.8Â MPa) in diluted model solutions (2 U PPO). The increase in enzyme concentration (6â26 U) nullified the effect of HS, probably due to protein structure stabilization by self-crowding. The application of HS at 100 and 200Â MPa to apple juice promoted a decrease in total bacteria, lactic acid bacteria, yeasts, and molds. These changes occurred in concomitance with the inactivation of PPO (zp = 227.3Â MPa). At 200Â MPa, PPO inactivation followed a biphasic first-order kinetic, suggesting the presence of PPO isozymes with different pressure sensitivity. The inactivation of PPO was observed to occur more rapidly with increasing storage pressure and led to the maintenance of the original bright juice color. This study proves the capability of HS to control enzyme-related quality decay in fruit juices and, potentially, in many other food matrices suffering enzymatic alteration
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