720 research outputs found
LOCATION STRATEGIES BASED ON DISCRETE CHOICE MODELS: AN EMPIRICAL APPLICATION TO SUPERMARKET LOCATION
In this paper we present a theoretic two-stage model for retailers location and consumers purchase decision. Retailers decision problem is formalized in terms of a zero-sum game, whose payoffs refers to retailers' market share and consumers decision problem is formalized in terms of a discrete choice model, based on random utilities. The theoretical models provide forecasting of equilibrium market shares and the locations to be chosen by retailers, in terms of the geographic distribution of the underlying location space (constituencies of the town), population distribution and characteristics (types) of the consumers.Hotelling, Industrial Organization, Choice Model
The influence of kineanthropometrical profile in deep-water tethered running
Aquatic jogging is a variant of head-out aquatic
exercises characterised by the walking and/or running of
a subject in aquatic environment. The main goal of this
aquatic program is to promote an increase of physical
fitness, specially the cardiorespiratory component
The influence of kineanthropometrical profile in deep-water tethered running
The purpose of this study was to identify the kineanthropometrical
parameters that best predict the maximal horizontal
propulsive force during deep-water tethered running.
21 young and healthy males with large experience in aquatic exercises (24.3+/-2.7 years old, 191.9+/-82.6 minutes physical
activity per week) performed 3 repetitions of maximal deep-water running for 10-s, using a flotation vest (Golfinho, H-906, Coimbra, Portugal). The subjects were connected to a strain gauge (Globus, Ergo Meter, Codigné, Italy) by a cable of steel with reduced elastic properties. The other
end of the cable was fasted to a rubber band and this to a swimming starting block. Dynamometrical data was exported
and processed with Matlab v. 6.0. It was evaluated the maximal propulsive force (Fx-max) and computed the
maximal horizontal propulsive force through a trigonometric
correction, as suggested by Taylor et al. (2003). Body mass
(SECA, 884, Hamburg, Germany), height (SECA, 242, Hamburg,
Germany), body mass index (BMI) and fat mass (BIA
101, RJL Systems, Florence, Italy) were also measured. Surface
area (SA) was calculated according to the procedure of
Du Bois and Du Bois (Shuter and Aslani, 2000). The forearms
(Globus, Ergo Meter, Codigné, Italy) and hands (TSD
121C, Biopac Systems, California, USA) maximal isometric
forces were also measured. Intra-cyclic variation of the
Fx-max presented a tetra-modal profile. Computing a stepby-
step regression equation, for prediction of the Fx-max,
the kineanthropometrical variables that entered the model
were the forearms maximal isometric force, the BMI, the
body mass and the SA (r^2=0.57, p=0.01). The purpose
of the study was achieved. Evidences revealed that some
kineanthropometrical parameters related to buoyancy force
(e.g., fat mass), to drag force (e.g., SA and height), to weight
force (e.g., body mass) and to propulsive force (e.g., segmental
forces) predicted the Fx-max. This means that, besides
physical fitness and technical level, often described in
the literature, kineanthropometrical characteristics of the runner
also affect significantly his performance during a training
session. The main conclusion is that tethered running is
significantly associated to kineanthropometrical profile of the
runner. So, instructors should pay attention to kineanthropometrical
characteristics of runners and how it affects their
performance
Rapport préliminaire sur les activités de la mission archéologique franco-syrienne dans la micro-région d'Al-Rawda (Shamiyeh) : quatrième et cinquième campagnes (2005 et 2006)
This preliminary report presents the results of two campaigns of excavation and survey in 2005and 2006 on the site of AI-Rawda (West-Central Syria) and in the micro-region of 100 km2 around it. Thesite is a pre-planned circular new town. It was founded around 2400 BCE, in the steppe zone and was inhabitedonly during EB IV, until the end of the 3rd millennium. The work of 2005 and 2006 involved furtherextensive excavation of a sanctuary consisting of two temples and a temenos togeiher with aIl associatedinstallations (including a betyl in situ). The eastem gate of the town was excavated and four lines of defencehave been identified. A stratigraphie sounding in the southwest clarifies the origin of the town. In the necropolisassociated with the site, the excavation of a collective pit burial is presented. Intensive survey wascontinued outside the ancient town, with particular attention to sites that were occupied at the same time asAI-Rawda, to burials, which have been classified by type, and to installations that can be linked to agricultureor pastoralism. This work was supplemented by archaeobotanical, archaeozoological and geo-archaeologicalresearch, as weIl as a study of the environment.Ce rapport préliminaire présente les résultats de deux campagnes de fouilles et de prospection conduites en 2005 et 2006 sur le site d’Al-Rawda (Syrie du centre-ouest) et dans la microrégion de 100 km2 qui l’entoure. Le site, une ville neuve circulaire au plan d’urbanisme préconçu fondé vers 2500 av. J.-C., se trouve en zone steppique. Il n’est habité que durant le Bronze ancien IV, jusqu’à la fin du 3e millénaire.Les travaux en 2005 et 2006 ont porté sur la poursuite du dégagement extensif d’un sanctuaire qui regroupe deux temples et un temenos, avec l’ensemble des installations qu’ils contiennent (dont un bétyle in situ). À l’est, a été mise au jour la porte orientale de la ville tandis que quatre lignes de défense ont été identifiées. Un sondage stratigraphique au sud-ouest éclaire l’origine de la ville. Dans la nécropole associée au site, la fouille d’une tombe en puits collective est présentée.Parallèlement, la prospection intensive autour de la ville antique a été poursuivie en mettant l’accent sur les sites d’habitat contemporains d’Al-Rawda, les tombes caractérisées par type et les aménagements qui peuvent être liés à une mise en valeur agricole du territoire et au pastoralisme. Ces travaux ont été complétés par des études archéobotanique, archéozoologique, géoarchéologique et par une étude des milieux
Global Search for New Physics with 2.0/fb at CDF
Data collected in Run II of the Fermilab Tevatron are searched for
indications of new electroweak-scale physics. Rather than focusing on
particular new physics scenarios, CDF data are analyzed for discrepancies with
the standard model prediction. A model-independent approach (Vista) considers
gross features of the data, and is sensitive to new large cross-section
physics. Further sensitivity to new physics is provided by two additional
algorithms: a Bump Hunter searches invariant mass distributions for "bumps"
that could indicate resonant production of new particles; and the Sleuth
procedure scans for data excesses at large summed transverse momentum. This
combined global search for new physics in 2.0/fb of ppbar collisions at
sqrt(s)=1.96 TeV reveals no indication of physics beyond the standard model.Comment: 8 pages, 7 figures. Final version which appeared in Physical Review D
Rapid Communication
Observation of Orbitally Excited B_s Mesons
We report the first observation of two narrow resonances consistent with
states of orbitally excited (L=1) B_s mesons using 1 fb^{-1} of ppbar
collisions at sqrt{s} = 1.96 TeV collected with the CDF II detector at the
Fermilab Tevatron. We use two-body decays into K^- and B^+ mesons reconstructed
as B^+ \to J/\psi K^+, J/\psi \to \mu^+ \mu^- or B^+ \to \bar{D}^0 \pi^+,
\bar{D}^0 \to K^+ \pi^-. We deduce the masses of the two states to be m(B_{s1})
= 5829.4 +- 0.7 MeV/c^2 and m(B_{s2}^*) = 5839.7 +- 0.7 MeV/c^2.Comment: Version accepted and published by Phys. Rev. Let
Shrinking a large dataset to identify variables associated with increased risk of Plasmodium falciparum infection in Western Kenya
Large datasets are often not amenable to analysis using traditional single-step approaches. Here, our general objective was to apply imputation techniques, principal component analysis (PCA), elastic net and generalized linear models to a large dataset in a systematic approach to extract the most meaningful predictors for a health outcome. We extracted predictors for Plasmodium falciparum infection, from a large covariate dataset while facing limited numbers of observations, using data from the People, Animals, and their Zoonoses (PAZ) project to demonstrate these techniques: data collected from 415 homesteads in western Kenya, contained over 1500 variables that describe the health, environment, and social factors of the humans, livestock, and the homesteads in which they reside. The wide, sparse dataset was simplified to 42 predictors of P. falciparum malaria infection and wealth rankings were produced for all homesteads. The 42 predictors make biological sense and are supported by previous studies. This systematic data-mining approach we used would make many large datasets more manageable and informative for decision-making processes and health policy prioritization
Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set
We report a measurement of the bottom-strange meson mixing phase \beta_s
using the time evolution of B0_s -> J/\psi (->\mu+\mu-) \phi (-> K+ K-) decays
in which the quark-flavor content of the bottom-strange meson is identified at
production. This measurement uses the full data set of proton-antiproton
collisions at sqrt(s)= 1.96 TeV collected by the Collider Detector experiment
at the Fermilab Tevatron, corresponding to 9.6 fb-1 of integrated luminosity.
We report confidence regions in the two-dimensional space of \beta_s and the
B0_s decay-width difference \Delta\Gamma_s, and measure \beta_s in [-\pi/2,
-1.51] U [-0.06, 0.30] U [1.26, \pi/2] at the 68% confidence level, in
agreement with the standard model expectation. Assuming the standard model
value of \beta_s, we also determine \Delta\Gamma_s = 0.068 +- 0.026 (stat) +-
0.009 (syst) ps-1 and the mean B0_s lifetime, \tau_s = 1.528 +- 0.019 (stat) +-
0.009 (syst) ps, which are consistent and competitive with determinations by
other experiments.Comment: 8 pages, 2 figures, Phys. Rev. Lett 109, 171802 (2012
A deep dive into the ecology of Gamay (Botany Bay, Australia): current knowledge and future priorities for this highly modified coastal waterway
Context: Gamay is a coastal waterway of immense social, cultural and ecological value. Since European settlement, it has become a hub for industrialisation and human modification. There is growing desire for ecosystem-level management of urban waterways, but such efforts are often challenged by a lack of integrated knowledge.
Aim and methods: We systematically reviewed published literature and traditional ecological knowledge (TEK), and consulted scientists to produce a review of Gamay that synthesises published knowledge of Gamay’s aquatic ecosystem to identify knowledge gaps and future research opportunities.
Key results: We found 577 published resources on Gamay, of which over 70% focused on ecology. Intertidal rocky shores were the most studied habitat, focusing on invertebrate communities. Few studies considered multiple habitats or taxa. Studies investigating cumulative human impacts, long-term trends and habitat connectivity are lacking, and the broader ecological role of artificial substrate as habitat in Gamay is poorly understood. TEK of Gamay remains a significant knowledge gap. Habitat restoration has shown promising results and could provide opportunities to improve affected habitats in the future.
Conclusion and implications: This review highlights the extensive amount of knowledge that exists for Gamay, but also identifies key gaps that need to be filled for effective management
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