186,915 research outputs found
Energy performance assessment of HVAC systems by inspection and monitoring
No full textThe paper discusses the collection and processing of energy performance data as part of the inspection of HVAC systems, aimed at identifying technically feasible and cost-effective Energy Conservation Opportunities (ECO), as required by EPBD. Case studies developed by the HARMONAC project have shown that low-cost or no-cost ECO's - mostly related to system operation and management - can be identified with an effective system monitoring. Building Management Systems (BMS) may be a powerful tool for this task, provided their HW and SW architecture is designed with adequate attention to energy monitoring. Dedicated instrumentation - such as electricity meters and temperature loggers - may also be employed as an alternative / integration to BMS monitoring. The paper also discusses the application of data analysis tools - such as "carpet plots" and "energy signatures" - to the identification of component malfunctioning, control problems, inadequate maintenance, or system schedule optimization, and to the evaluation of achieved energy saving
Enhancing the potential of enantioselective organocatalysis with light
No full textOrganocatalysis - catalysis mediated by small chiral organic molecules - is a powerful technology for enantioselective synthesis, and has extensive applications in traditional ionic, two-electron-pair reactivity domains. Recently, organocatalysis has been successfully combined with photochemical reactivity to unlock previously inaccessible reaction pathways, thereby creating new synthetic opportunities. Here we describe the historical context, scientific reasoning and landmark discoveries that were essential in expanding the functions of organocatalysis to include one-electron-mediated chemistry and excited-state reactivity
Variational quantum state preparation via quantum data buses
No full textWe propose a variational quantum algorithm to prepare ground states of 1D lattice quantum Hamiltonians specifically tailored for programmable quantum devices where interactions among qubits are mediated by Quantum Data Buses (QDB). For trapped ions with the axial Center-Of-Mass (COM) vibrational mode as single QDB, our scheme uses resonant sideband optical pulses as resource operations, which are potentially faster than off-resonant couplings and thus less prone to decoherence. The disentangling of the QDB from the qubits by the end of the state preparation comes as a byproduct of the variational optimization. We numerically simulate the ground state preparation for the Su-Schrieffer-Heeger model in ions and show that our strategy is scalable while being tolerant to finite temperatures of the COM mode
Quantitative entanglement witnesses of isotropic and Werner classes via local measurements
No full textQuantitative entanglement witnesses allow one to bound the entanglement present in a system by acquiring a single expectation value. In this paper, we analyze a special class of such observables which are associated with (generalized) Werner and isotropic states. Their optimal bounding functions can be easily derived by exploiting known results on twirling transformations. By focusing on an explicit local decomposition for these observables, we then show how simple classical post-processing of the measured data can tighten the entanglement bounds. Quantum optics implementations based on hyperentanglement generation schemes are analyzed
Sensitivity and specificity of example filters applied to final HLA-class I results table from SILVI.
No full textSensitivity and specificity of example filters applied to final HLA-class I results table from SILVI.</p
Sensitivity and specificity of example filters applied to final HLA-class II results table from SILVI.
No full textSensitivity and specificity of example filters applied to final HLA-class II results table from SILVI.</p
Enantioselective Formal α-Methylation and α-Benzylation of Aldehydes by Means of Photo-Organocatalysis
No full textDetailed herein is the photochemical organocatalytic enantioselective α-alkylation of aldehydes with (phenylsulfonyl)alkyl iodides. The chemistry relies on the direct photoexcitation of enamines to trigger the formation of reactive carbon-centered radicals from iodosulfones, while the ground-state chiral enamines provide effective stereochemical control over the radical trapping process. The phenylsulfonyl moiety, acting as a redox auxiliary group, facilitates the generation of radicals. In addition, it can eventually be removed under mild reducing conditions to reveal methyl and benzyl groups
Strategic Cost Management and Lean Thinking: A framework for management Accounting
No full textThe article describes a possible integrative model based on synergies between the strategic cost management approach and lean management tool
Entanglement of Formation of Mixed Many-Body Quantum States via Tree Tensor Operators
No full textWe present a numerical strategy to efficiently estimate bipartite entanglement measures, and in particular the entanglement of formation, for many-body quantum systems on a lattice. Our approach exploits the tree tensor operator tensor network Ansatz, a positive loopless representation for density matrices which, as we demonstrate, efficiently encodes information on bipartite entanglement, enabling the upscaling of entanglement estimation. Employing this technique, we observe a finite-size scaling law for the entanglement of formation in 1D critical lattice models at finite temperature for up to 128 spins, extending to mixed states the scaling law for the entanglement entropy
Silvi-kulturella möten : Sveriges lantbruksuniversitet och högre skoglig utbildning i Etiopien 1986–2009
No full textArtikeln behandlar Sveriges lantbruksuniversitets stöd till uppbyggandet av högre skoglig utbildning i Etiopien, som ägde rum mellan 1986 och 2009 inom ramen för det svensk-etiopiska utvecklingssamarbetet. Med utgångspunkt i ett växande utbildningshistoriskt intresse för gränsöverskridande möten analyseras hur svenska skogsexperter utformade utbildningar och undervisade i nya miljöer. Begreppet ”silvi-kultur” introduceras för att beskriva hur de spänningar som växte fram inom ramen för engagemanget både handlade om hur skogsutbildning bör gå till och om divergerande akademiska och sociala kulturer. Artikeln är strukturerad kring tre slags ”silvi-kulturella möten” som beskriver biståndsprojektets utveckling tematiskt och kronologiskt. Dessa möten används för att visa att skogen som en konkret, fysisk plats var av central betydelse för de svenska experterna, och för att visa hur de svenska insatserna formades av en förförståelse utvecklad inom ramen för en svensk silvi-kultur som bara delvis var kompatibel med förhållanden i Etiopien.QC 20170411</p
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