8,149 research outputs found
Collision of a sphere onto a wall coated with a liquid film
Particle-particle and particle-wall collisions occur in many natural and
industrial applications such as sedimentation, agglomeration, and granular
flows. To accurately predict the behavior of particulate flows, fundamental
knowledge of the mechanisms of a single collision is required. In this fluid
dynamics video, particle-wall collisions onto a wall coated with 1.5%
poly(ethylene-oxide) (PEO) (viscoelastic liquid) and 80% Glycerol and water
(Newtonian liquid) are shown.Comment: 1 page, no figure
The use of derivatives in the Spanish mutual fund industry
We study the use of derivatives in the Spanish mutual fund industry. The picture that emerges from our analysis is rather negative. In general, the use of derivatives does not improve the performance of the funds. In only one out of eight categories we find some (very weak and not robust) evidence of superior performance. In most of the cases users significantly underperform non users. Furthermore, users do not seem to exhibit superior timing or selectivity skills either, but rather the contrary. This bad performance is only partially explained by the larger fees funds using derivatives charge. Moreover, we do not find evidence of derivatives being used for hedging purposes. We do find evidence of derivatives being used for speculation. But users in only one category exhibit skills as speculators. Finally, we find evidence of derivatives being used to manage the fundsâ cash inflows and outflows more efficiently.Mutual Funds, Derivative use, Risk Management
Elastic amplitudes studied with the LHC measurements at 7 and 8 TeV
Recent measurements of the differential cross sections in the forward region
of pp elastic scattering at 7 and 8 TeV show precise form of the
dependence. We propose a detailed analysis of these measurements including the
structures of the real and imaginary parts of the scattering amplitude. A good
description is achieved, confirming in all experiments the existence of a zero
in the real part in the forward region close to the origin, in agreement with
the prediction of a theorem by A. Martin, with important role in the observed
form of . Universal value for the position of this zero and
regularity in other features of the amplitudes are found, leading to
quantitative predictions for the forward elastic scattering at 13 TeV.Comment: 22 pages, 17 figures and 4 table
Moringa oleifera: uma planta de uso mĂșltiplo.
Origem; Descrição botĂąnica e classificaçã da moringa; Principais espĂ©cies; Ecologia; Distribuição geogrĂĄfica; Cultivo; Usus; Doenças e pragas; Melhoramento; Potencial econĂŽmico, ambiental e benefĂcios sociais da Moringa Oleifera.bitstream/item/44719/1/CPATC-DOCUMENTOS-9-MORINGA-OLEIFERA-UMA-PLANTA-DE-USO-MULTIPLO-FL-13127A.pd
Guia pråtico para identificação de algumas plantas tóxicas em jardins.
Introdução; Alamanda amarela; Flamboiazinho; Lantana; Costela-de-adao; Espirradeira; Aroeira manasa, aroeira branca; Chapeu-de-napoleao; Comigo-ninguem-pode.bitstream/item/82959/1/CPATC-DOC.-16-00.pd
Production lot sizing and scheduling with non-triangular sequence-dependent setup times
[NB some mathematical symbols in this abstract may not be correctly reproduced - please check the full text.] This article considers a production lot sizing and scheduling problem with sequence dependent setup times that are not triangular. Consider, for example, a product p that contaminates some other product r unless either a decontamination occurs as part of a substantial setup time stpr or there is a third product q that can absorb pâs contamination. When setup times are triangular then stpr †stpq + stqr and there is always an optimal lot sequence with at most one lot (AM1L) per product per period. However, product qâs ability to absorb pâs contamination presents a shortcut opportunity and could result in shorter non-triangular setup times such that stpr > stpq +stqr. This implies that it can sometimes be optimal for a shortcut product such as q to be produced in more than one lot within the same period, breaking the AM1L assumption in much research. This article formulates and explains a new optimal model that not only permits multiple lots (ML) per product per period, but also prohibits subtours using a polynomial number of constraints rather than an exponential number. Computational tests demonstrate the effectiveness of the ML model, even in the presence of just one decontaminating shortcut product, and its fast speed of solution compared to the equivalent AM1L model
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