23,946 research outputs found
CE Challenges: Work to Do
No full textCE has been used for more than two decades now. Despite many successes and advantages, there are still many challenges to be addressed. These challenges are both technical and organisational. In the paper we will address the current challenges of CE. Many challenges are related to the exchange of data and knowledge and to the systems that make data and knowledge exchange possible. Although much progress has been made in enabling extensive data and knowledge exchange and use, much remains to be wished. For example, there are still barriers to data exchange. Technically, these barriers may consist of different formats, differences in infrastructures and systems, and different semantics. There are also organisational and political barriers. For example, investment in information system may heavily impact upstream suppliers, while revenues of better information exchange may predominantly be gained by downstream actors. Without sharing costs and revenues, chain-wide information exchange will not be easily realised. Another barrier is the possible lack of willingness to share information, because of potential misuse of knowledge and loss of power. The paper is organised as follows. First we will describe the current manifestation of CE as described in a recent book. Second, we will list current trends in CE. Third, we will present some Critical Success Factors (CSFs) that are considered relevant for implementing and adapting CE practices. Last, we indicate some research and practical questions to be addressed, especially for areas that have a high potential and actual impact. </p
Synthesis optimization and charge carrier transfer mechanism in LiLuSiO<sub>4</sub>:Ce, Tm storage phosphor
No full textLiLuSiO4:Ce and LiLuSiO4:Ce, Tm show very efficient charge carrier storage properties upon beta irradiation after samples have received treatment in vacuum. They outperform the commercial storage phosphor BaFBr(I):Eu2+ in many aspects. The influence of the synthesis conditions, Ce and Tm concentration, nonstoichiometry and codoping with Ca, Hf, Al and Ge are reported. Based on the results of the synthesis optimization, thermoluminescence (TL) emission and TL excitation spectra a mechanism of charge carrier transfer, storage, and recombination during irradiation and thermal or optical readout is proposed.Accepted Author ManuscriptRST/Fundamental Aspects of Materials and EnergyRST/Luminescence Material
The impact of P(NDI2OD-T2) crystalline domains on the open-circuit voltage of bilayer all-polymer solar cells with an inverted configuration
No full textWe fabricated P(NDI2OD-T2)/PTB7 bilayer all-polymer solar cells with an inverted configuration, where the annealing temperature was systematically varied. The current density-voltage behavior was investigated and the structural properties of the P(NDI2OD-T2) layers were characterized. Absorption spectroscopy, surface morphology, and crystallite analysis showed that increasing phase segregation of P(NDI2OD-T2) films occurred as the annealing temperature increased. We found that, as the P(NDI2OD-T2) stacking improved, with larger domains, the open-circuit voltage decreased and the saturation dark current density increased. This work provides a guide for the processing of P(NDI2OD-T2) layers to maximize the power conversion efficiency of all-polymer solar cells. (C) 2015 Author(s).open1186sciescopu
Data and code for: Variational Graph Author Topic Modeling
No full textThis is the tensorflow implementation of KDD-2022 paper "Variational Graph Author Topic Modeling" by Delvin Ce Zhang and Hady W. Lauw.
VGATM is a Graph Neural Network model that extracts interpretable topics for documents with authors and venues. Topics of documents then fulfill document classification, citation prediction, etc.
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Updated analytical solutions of continuity equation for electron beams precipitation – I. Pure collisional and pure ohmic energy losses
No full textWe present updated analytical solutions of continuity equations for power-law beam electrons precipitating in (a) purely collisional losses and (b) purely ohmic losses. The solutions of continuity equation (CE) normalized on electron density presented in Dobranskis & Zharkova are found by method of characteristics eliminating a mistake in the density characteristic pointed out by Emslie et al. The corrected electron beam differential densities (DD) for collisions are shown to have energy spectra with the index of −(γ + 1)/2, coinciding with the one derived from the inverse problem solution by Brown, while being lower by 1/2 than the index of −γ/2 obtained from CE for electron flux. This leads to a decrease of the index of mean electron spectra from −(γ − 2.5) (CE for flux) to −(γ − 2.0) (CE for electron density). The similar method is applied to CE for electrons precipitating in electric field induced by the beam itself. For the first time, the electron energy spectra are calculated for both constant and variable electric fields by using CE for electron density. We derive electron DD for precipitating electrons (moving towards the photosphere, μ = +1) and ‘returning’ electrons (moving towards the corona, μ = −1). The indices of DD energy spectra are reduced from −γ − 1 (CE for flux) to −γ (CE for electron density). While the index of mean electron spectra is increased by 0.5, from −γ + 0.5 (CE for flux) to −γ + 1(CE for electron density). Hard X-ray intensities are also calculated for relativistic cross-section for the updated differential spectra revealing closer resemblance to numerical Fokker–Planck (FP) solutions
X(3872) and its production at hadron colliders
No full textWe evaluate the production cross sections of X(3872) at the LHC and Tevatron at NLO in alpha(s) in NRQCD by assuming that the short-distance production proceeds dominantly through chi'(c1) component in our chi'(c1) - D-0(D) over bar*(0) mixing model for X(3872). The outcomes of the fits to the CMS p(T) distribution can well account for the recent ATLAS data in a much larger range of transverse momenta (10 GeV < p(T) < 70 GeV) and the CDF total cross section data, and are also consistent with the value of k = Z(c (c) over bar) . Br(X -> J/Psi pi(+)pi(-)) constrained by the B-meson decay data. For LHCb, the predicted X(3872) total cross section is larger than the data by a factor of 2, which is due to the problem of the fixed-order NRQCD calculation that may not be applicable for the region with small p(T) (p(T) similar to 5 GeV) and large forward rapidity (2.5 < y < 4.5). In comparison, the prediction of the molecule production mechanism for X(3872) is inconsistent with both p(T) distributions and total cross sections of CMS and ATLAS, and the total cross section of CDF.National Natural Science Foundation of China [11475005, 11075002]; National Key Basic Research Program of China [2015CB856700]SCI(E)ARTICLE79
La lutte contre l'épidémie: un point de vue personnel
No full textDans ce témoignage, Meng Lin, une personne vivant avec le VIH/ SIDA (PvVIH) et également un activiste engagé dans la lutte contre l’épidémie, expose son point du vue sur la situation actuelle d’un point de vue à la fois personnel et professionnel. Il est en effet le fondateur et responsable de l’association Ark of Love qui a pour objectif d’informer et d’aider les PvVIH à s’organiser et à établir leurs propres structures d’entre-aide et de défense de leurs droits.Lin Meng, Gnep Yuvany. La lutte contre l'épidémie: un point de vue personnel. In: Perspectives chinoises, n°106, 2009. pp. 4-7
Introduction and Author Biographical Notes
No full textThe Introductory Notes include The Cutting EDge\u27s mission statement, editorial board, founder\u27s note, and author\u27s biographies
La doctorante Meng Kou (ENS-PSL/CMH) rejoint le groupe SOLAL
No full text Meng KOU, doctorante inscrite au CMH sous la direction de Florence Weber et Christine Tichit depuis décembre 2022, travaille sur les enjeux de santé publique transnationale chez les familles subsahariennes à Paris, et plus particulièrement sur la santé des enfants drépanocytaires en parcours de migration. Pourais-tu résumer ton sujet d’étude et ses enjeux ? Ce projet de recherche porte sur la prise en charge des enfants porteurs de la drépanocytose par leur famille, issue d’immigration s..
From the Editors and Author Biographical Notes
No full textLetter from the Editors and Author Biographical Note
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