• Energy Research
• DE close
• IT close
• AT close
• English close
• Hyper Article en Ligne close

Urban logistics is a field that studies the best solutions for urban freight distribution with high environmental objectives. However, most actions are started by public authorities without taking into account the impacts of the new organizational schemas in the existing distribution enterprises’ organization. This paper proposes a case study from Padova, Italy: the city logistics system Cityporto, from which the sustainability of such systems is discussed in a Sustainable Development point of view, for both enterprise and collective dimensions, in order to relate the particularities of city logistics to the corresponding supply chains, i.e. to global logistics. Tema. Journal of Land Use, Mobility and Environment, Vol 3, N° 2 (2010): City Logistics

Today, the term “liquid sunlight” refers to a green fuel obtained by means of a process inspired by the natural photosynthesis. The method to have this fuel is based on the combination of compatible inorganic and biological components to transform light, water, and carbon dioxide to methane. A similar term, “sunlight-to-liquid” or “sun-to-liquid”, exists for a recently proposed synthesis of a gas, which is further processed to obtain kerosene. Here we will show that in the past the term “liquid sunlight” was used for the petroleum. Actually, the meaning of the term, today and in the past, is the same: conversion of the sunlight energy into a fuel.

The dynamics of isolated-photon production in association with a jet in proton–proton collisions at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2 $fb^{−1}$. Photons are required to have transverse energies above 125 GeV. Jets are identified using the anti-$k_t$ algorithm with radius parameter $R = 0.4$ and required to have transverse momenta above 100 GeV. Measurements of isolated-photon plus jet cross sections are presented as functions of the leading-photon transverse energy, the leading-jet transverse momentum, the azimuthal angular separation between the photon and the jet, the photon–jet invariant mass and the scattering angle in the photon–jet centre-of-mass system. Tree-level plus parton-shower predictions from Sherpa and Pythia as well as next-to-leading-order QCD predictions from Jetphox and Sherpa are compared to the measurements. Physics letters / B 780, 578 - 602 (2018). doi:10.1016/j.physletb.2018.03.035 Published by North-Holland Publ., Amsterdam

Room models, currently used for controller tests, assume the room air to be perfectly mixed. A new room model is developed, assuming non-homogeneous room conditions and distinguishing between different sensor positions. From measurement in real test rooms and detailed CFD simulations, a list of convective phenomena is obtained that has to be considered in the development of a model for a room equipped with different HVAC systems. The zonal modelling approach that divides the room air into several sub-volumes is chosen, since it is able to represent the important convective phenomena imposed on the HVAC system. The convective room model is divided into two parts: a zonal model, representing the air at the occupant zone and a second model, providing the conditions at typical sensor positions. Using this approach, the comfort conditions at the occupant zone can be evaluated as well as the impact of different sensor positions. The model is validated for a test room equipped with different HVAC systems. Sensitivity analysis is carried out on the main parameters of the model. Performance assessment and energy consumption are then compared for different sensor positions in a room equipped with different HVAC systems. The results are also compared with those obtained when a well-mixed model is used. A main conclusion of these tests is, that the differences obtained, when changing the position of the controller's sensor, is a function of the HVAC system and controller type. The differences are generally small in terms of thermal comfort but significant in terms of overall energy consumption. For different HVAC systems the cases are listed, in which the use of a simplified model is not recommended. This PhD has been submitted in accordance to the conditions for attaining both the French and the German degree of a PhD, on a co-national basis, in the frame of a statement of the French government from January 18th, 1994. The research has been carried out in the Automation and Energy Management Group (AGE), Department of Sustainable Development (DDD), at the "Centre Scientifique et Technique du Bâtiment" (CSTB) in Marne la Vallée, France, in collaboration with the "Centre Energétique" (CENERG) at the "Ecole Nationale Supérieure des Mines de Paris" (ENSMP), Paris, France and the Technical University of Dresden (TUD), Germany.

Measurements of dijet $p_T$ correlations in Pb+Pb and pp collisions at a nucleon–nucleon centre-of-mass energy of $\sqrt{{s}NN}$ = 2.76 TeV are presented. The measurements are performed with the ATLAS detector at the Large Hadron Collider using Pb + Pb and pp data samples corresponding to integrated luminosities of 0.14 nb$^{−1}$ and 4.0 pb$^{−1}$ , respectively. Jets are reconstructed using the anti-$k_t$ algorithm with radius parameter values R = 0.3 and R = 0.4 . A background subtraction procedure is applied to correct the jets for the large underlying event present in Pb+Pb collisions. The leading and sub-leading jet transverse momenta are denoted $p_{{T}_{1}}$ and $p_{{T}_{2}}$ . An unfolding procedure is applied to the two-dimensional ( $p_{{T}_{1}}, p_{{T}_{2}}$ ) distributions to account for experimental effects in the measurement of both jets. Distributions of (1/N)dN/$dx_J$ , where $x_J$ = $p_{{T}_{1}} / p_{{T}_{2}}$ , are presented as a function of $p_{{T}_{1}}$ and collision centrality. The distributions are found to be similar in peripheral Pb+Pb collisions and pp collisions, but highly modified in central Pb + Pb collisions. Similar features are present in both the R = 0.3 and R = 0.4 results, indicating that the effects of the underlying event are properly accounted for in the measurement. The results are qualitatively consistent with expectations from partonic energy loss models.

International audience