• Energy Research
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This work explores the relationship between energy efficiency, productivity and exporting for a sample of firms located in thirty Latin American and Caribbean (LAC) countries. This relationship has not been studied in depth although it is important and relevant to policymaking. We apply a standard constant returns to scale Cobb-Douglas production function with labor, capital, and knowledge expanded to exports and energy efficiency. We also investigate the relationship between energy efficiency and exporting and take heterogeneity by firms and industries into account. Firm-level data come from the national representative World Bank Enterprise Survey (WBES). Our empirical analysis finds heterogeneous results by firm size and industrial sector both in the relationship between energy efficiency and productivity and between energy efficiency and exporting. These outcomes are robust to different measures of energy efficiency and controlling for heterogeneity among countries and provinces. By providing for the first time an extensive investigation of energy intensity and firm performance for such a large sample of LAC countries, this work contributes to the lively debate on LAC energy efficiency and weak productivity. By adopting a broader productivity and international trade perspective, it opens the ground to a rethinking of the priorities of energy saving policies and their environmental impacts.

A measurement of the production of three isolated photons in proton–proton collisions at a centre-of-mass energy $\sqrt{s}$ = 8 TeV is reported. The results are based on an integrated luminosity of 20.2 fb$^{−1}$ collected with the ATLAS detector at the LHC. The differential cross sections are measured as functions of the transverse energy of each photon, the difference in azimuthal angle and in pseudorapidity between pairs of photons, the invariant mass of pairs of photons, and the invariant mass of the triphoton system. A measurement of the inclusive fiducial cross section is also reported. Next-to-leading-order perturbative QCD predictions are compared to the cross-section measurements. The predictions underestimate the measurement of the inclusive fiducial cross section and the differential measurements at low photon transverse energies and invariant masses. They provide adequate descriptions of the measurements at high values of the photon transverse energies, invariant mass of pairs of photons, and invariant mass of the triphoton system. Physics letters / B 781, 55 - 76 (2018). doi:10.1016/j.physletb.2018.03.057 Published by North-Holland Publ., Amsterdam

AbstractGreen roofs are becoming common practice in building new public buildings and are considered the roofs for the future since they address the issue of energy and environment simultaneously, providing social, environmental and economic benefits. Despite these benefits, retrofitting an existing building with a green roof is not widely practiced. Undergoing such a project is no small task since it requires a thorough investigation of existing building's constraints, functional, material, and technological to even begin considering design options. Therefore, this process requires specific, case-sensitive approach, especially with the aim of improving the building’s energy performance. This paper presents a methodological approach and design proposals of a green roof retrofit project, through a case study of Belgrade’s “City Housing” building. This retrofit project presents an interesting research topic since it incorporates three distinct roofs, of all of different types, different ways of accessibility and levels of privacy, varying top-to-bottom from a simple extensive roof through a semi-public semi/intensive roof garden to a ground-level public park with trees and intensive vegetation. Also, since this building provides socially significant services, it is frequently visited by general public which presents a potential for introducing educational and demonstration elements in the retrofit project, not only the functional and technological ones. That way, this project can be a showcase example, promoting greening the roofs of Belgrade’s existing public buildings as a way of improving their energy performance.

A simultaneous measurement of the top-quark, W-boson, and neutrino masses is reported for tt¯ events selected in the dilepton final state from a data sample corresponding to an integrated luminosity of 5.0 fb−1 collected by the CMS experiment in pp collisions at s√=7 TeV. The analysis is based on endpoint determinations in kinematic distributions. When the neutrino and W-boson masses are constrained to their world-average values, a top-quark mass value of Mt=173.9±0.9 (stat.)+1.7−2.1 (syst.) GeV is obtained. When such constraints are not used, the three particle masses are obtained in a simultaneous fit. In this unconstrained mode the study serves as a test of mass determination methods that may be used in beyond standard model physics scenarios where several masses in a decay chain may be unknown and undetected particles lead to underconstrained kinematics. The European Physical Journal C, 73 (7) ISSN:1434-6044 ISSN:1434-6052