Observaciones del planetoide (51) Nemusa durante los años 1951-1954

Reaction of AlMe₃ with S­(SiMe₃)­(C₆H₃-2-CH₂NRR′-5-^<i>t</i>Bu) (RR′ = C₅H₁₀ (<b>1a</b>), C₄H₈ (<b>1b</b>), Me₂ (<b>1c</b>)), at ambient temperature, affords the amino adducts [AlMe₃{S­(SiMe₃)­(C₆H₃-2-CH₂NRR′-5-^<i>t</i>Bu)}-<i>κN</i>] (RR′ = C₅H₁₀ (<b>2a</b>), C₄H₈ (<b>2b</b>), Me₂ (<b>2c</b>)), which undergo TMS elimination upon heating to give the monomeric aminoarenethiolate aluminum complexes [AlMe₂{S­(C₆H₃-2-CH₂NRR′-5-^<i>t</i>Bu)-κ²<i>S,N</i>}] (RR′ = C₅H₁₀ (<b>3a</b>), C₄H₈ (<b>3b</b>), Me₂ (<b>3c</b>)). Following the same procedure, treatment of AlCl₂Me and AlCl₃ with <b>1</b> yields analogous aminoarenethiolate aluminum complexes with different degrees of methylation, the chloro methyl and dichloro complexes [AlClMe­{S­(C₆H₃-2-CH₂NRR′-5-^<i>t</i>Bu)-κ²<i>S,N</i>}] (RR′ = C₅H₁₀ (<b>4a</b>), C₄H₈ (<b>4b</b>), Me₂ (<b>4c</b>)) and [AlCl₂{S­(C₆H₃-2-CH₂NRR′-5-^<i>t</i>Bu)}-κ²<i>S,N</i>] (RR′ = C₅H₁₀ (<b>5a</b>), C₄H₈ (<b>5b</b>) Me₂ (<b>5c</b>)), respectively. These complexes have been characterized by multinuclear NMR spectroscopy and elemental analysis. Moreover, the molecular structures of <b>3a</b>,<b>b</b> have been determined by X-ray diffraction methods. Aluminum complexes <b>3</b> have been investigated for the ring-opening polymerization (ROP) of l-lactide, achieving high conversions in relatively short periods of time. The PLAs obtained feature an aminoarenethiolate end functionality, as inferred from MALDI-TOF mass analysis

Measurement of the integrated luminosity of the Phase 2 data of the Belle II experiment

From April to July 2018, a data sample at the peak energy of the γ(4S) resonance was collected with the Belle II detector at the SuperKEKB electron-positron collider. This is the first data sample of the Belle II experiment. Using Bhabha and digamma events, we measure the integrated luminosity of the data sample to be (496.3 ± 0.3 ± 3.0) pb-1, where the first uncertainty is statistical and the second is systematic. This work provides a basis for future luminosity measurements at Belle II

Operation and performance of the ATLAS Tile Calorimeter in Run 1

The Tile Calorimeter is the hadron calorimeter covering the central region of the ATLAS experiment at the Large Hadron Collider. Approximately 10,000 photomultipliers collect light from scintillating tiles acting as the active material sandwiched between slabs of steel absorber. This paper gives an overview of the calorimeter’s performance during the years 2008–2012 using cosmic-ray muon events and proton–proton collision data at centre-of-mass energies of 7 and 8TeV with a total integrated luminosity of nearly 30 fb−1. The signal reconstruction methods, calibration systems as well as the detector operation status are presented. The energy and time calibration methods performed excellently, resulting in good stability of the calorimeter response under varying conditions during the LHC Run 1. Finally, the Tile Calorimeter response to isolated muons and hadrons as well as to jets from proton–proton collisions is presented. The results demonstrate excellent performance in accord with specifications mentioned in the Technical Design Report

A Dynamic Combinatorial Approach for the Analysis of Weak Carbohydrate/Aromatic Complexes: Dissecting Facial Selectivity in CH/π Stacking Interactions

A dynamical combinatorial approach for the study of weak carbohydrate/aromatic interactions is presented. This methodology has been employed to dissect the subtle structure–stability relationships that govern facial selectivity in these supramolecular complexes

Environmental and Economic Analysis of a Natural Gas Combined Cycle Power Plant Using CO₂ Utilization Technologies and Ecosystem Services

Power plants are major contributors to CO2 emissions. Post-combustion carbon capture (PCC) processes are commonly integrated, but the capture effectiveness is limited. In this work, four conversion technologies for CO2 utilization from a power plant plus PCC to produce formic acid, methanol, and syngas as value-added chemicals are analyzed. We also analyze the implications of implementing forest ecosystems, for which trees with three types of maturity are considered. The results show that the environmental implications of process utilization technologies may lack desired effectiveness, since the emissions of the utilization plant may still be significant with respect to the amount of captured CO2. Ecological systems are more effective from environmental considerations, but the number of trees and land use may be too high to process the amount of CO2 produced by power plants. A hybrid scheme that integrates a suitable transformation technology with forest ecosystems shows that they may have benefits from both economic and sustainability considerations