Search results for "FOS"
showing 10 items of 15075 documents
Synthesis, Reactivity, and Computational Analysis of Halophosphines Supported by Dianionic Guanidinate Ligands
2012
The reported chemistry and reactivity of guanidinate supported group 15 elements in the +3 oxidation state, particularly phosphorus, is limited when compared to their ubiquity in supporting metallic elements across the periodic table. We have synthesized a series of chlorophosphines utilizing homo- and heteroleptic (dianionic)guanidinates and have completed a comprehensive study of their reactivity. Most notable is the reluctancy of these four-membered rings to form the corresponding N-heterocyclic phosphenium cations, the tendency to chemically and thermally eliminate carbodiimide, and the scarcely observed ring expansion by insertion of a chloro(imino)phosphine into a P–N bond of the P–N–…
Traduction de : Jimenez, Jimi et Herrasti, Lourdes, "Objets associés des fosses de la guerre civile en Espagne"
2017
International audience
AI ethics:an empirical study on the views of practitioners and lawmakers
2023
Artificial intelligence (AI) solutions and technologies are being increasingly adopted in smart systems contexts; however, such technologies are concerned with ethical uncertainties. Various guidelines, principles, and regulatory frameworks are designed to ensure that AI technologies adhere to ethical well-being. However, the implications of AI ethics principles and guidelines are still being debated. To further explore the significance of AI ethics principles and relevant challenges, we conducted a survey of 99 randomly selected representative AI practitioners and lawmakers (e.g., AI engineers and lawyers) from 20 countries across five continents. To the best of our knowledge, this is the …
Cadenet. Oppidum du Castellar
2009
National audience
First measurement of the Sivers asymmetry for gluons using SIDIS data
2017
The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. It was extracted from measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it turned out to be non-zero for quarks. In this letter the evaluation of the Sivers asymmetry for gluons in the same process is presented. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon-gluon fusion, QCD Compton scattering and leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simul…
Forward light-by-light scattering and electromagnetic correction to hadronic vacuum polarization
2023
Lattice QCD calculations of the hadronic vacuum polarization (HVP) have reached a precision where the electromagnetic (e.m.) correction can no longer be neglected. This correction is both computationally challenging and hard to validate, as it leads to ultraviolet (UV) divergences and to sizeable infrared (IR) effects associated with the massless photon. While we precisely determine the UV divergence using the operator-product expansion, we propose to introduce a separation scale $\Lambda\sim400\;$MeV into the internal photon propagator, whereby the calculation splits into a short-distance part, regulated in the UV by the lattice and in the IR by the scale $\Lambda$, and a UV-finite long-di…
Orígenes y desarrollo de la hagiografía griega a través de la figura de Santa Tecla
2013
En este trabajo examinamos los orígenes y el desarrollo de la hagiografía griega a través de la figura de Santa Tecla. Se trata de un análisis literario diacrónico que comienza en el siglo II con el estudio de los Hechos de Pablo y Tecla y finaliza en el siglo V con la Vida y Milagros de Santa Tecla. Está formado por tres partes fundamentales en las cuales observamos las diferentes etapas en la evolución de la tradición hagiográfica de Tecla a través de los textos griegos que hablan sobre ella. En primer lugar presentamos un análisis literario del texto de los Hechos de Pablo y Tecla poniendo especial atención en su relación con los diferentes géneros literarios de la época (biografía y nov…
Modeling and Mitigating Errors in Belief Propagation for Distributed Detection
2021
We study the behavior of the belief-propagation (BP) algorithm affected by erroneous data exchange in a wireless sensor network (WSN). The WSN conducts a distributed multidimensional hypothesis test over binary random variables. The joint statistical behavior of the sensor observations is modeled by a Markov random field whose parameters are used to build the BP messages exchanged between the sensing nodes. Through linearization of the BP message-update rule, we analyze the behavior of the resulting erroneous decision variables and derive closed-form relationships that describe the impact of stochastic errors on the performance of the BP algorithm. We then develop a decentralized distribute…
Alusveden hapetuksen vaikutus pienten humusjärvien syvännepohjaeläimistön tilaan
2016
Järvien vedenlaatua ja ekologista tilaa voidaan pyrkiä parantamaan erilaisilla kunnostusmenetelmillä, joista alusveden hapetus on yksi käytetyimmistä. Alusvettä hapetetaan kierrättämällä päällysvettä pohjanläheisyyteen, ja menetelmän avulla pyritään ehkäisemään järven sisäistä kuormitusta. Hapetus kuitenkin nostaa alusveden lämpötilaa ja estää järven luontaisen kerrostumisen. Tieteellisiä tutkimuksia hapetuksen pitkäaikaisista vaikutuksista järvien tilaan on niukasti, vaikka hapetus on ollut suosittu kunnostusmenetelmä jo 1970-luvulta lähtien. Tässä tutkimuksessa tarkasteltiin kolmen keskisuomalaisen järven (Jyväsjärvi, Tuomiojärvi ja Alvajärvi) syvännepohjaeläinyhteisöissä tapahtuneita muu…
Precipitation of potassium as hazenite from washing water of spent alkaline batteries
2022
Hazenite (KNaMg2(PO4)2 × 14 H2O), a new type of struvite mineral, was precipitated from the potassium-rich washing water of spent alkaline battery black mass. Hazenite can be used as a fertilizer, which would be an additional benefit derived from the sustainable recovery of battery materials. Precipitation experiments were performed using different pH values (9.5–12), Mg:K:PO4 ratios ((1.0–1.5):1:(1.0–1.5)) and temperatures (10–40 °C). Based on the results, hazenite precipitated in a wide pH range under alkaline conditions. The precipitation kinetics were fast, and the purity of the hazenite was high. Overall, hazenite can be precipitated at room temperature without the addition of excess c…