316 research outputs found
Looking In, Looking Out: The Chinese-Caribbean Diaspora through Literature—Meiling Jin, Patricia Powell, Jan Lowe Shinebourne
No full textFew scholars have focused on the Chinese diaspora in the Caribbean, and it is only fairly recently that the literature written by Caribbean writers of Chinese origin has aroused interest. This essay interrogates the lack of visibility of Chinese-Caribbean writers, like Meiling Jin and Jan Shinebourne, whose ancestors arrived in Guyana in the nineteenth century as indentured workers, and are now considered to be Caribbean writers of Guyanese origin living in the UK, with the Chinese element being (almost) erased (but not quite). This essay also considers Patricia Powell since she focuses on the Chinese diaspora in the Caribbean, even though she is not of Chinese origin but a Jamaican American writer
Impulsivity in patients with obsessive-compulsive disorder: exploring the mediating effect of cognitive emotion regulation strategies and depressive symptoms
No full textBackgroundThe underlying mechanism of impulsivity in obsessive-compulsive disorder (OCD) patients is complex and still unclear. Previous studies have not thoroughly explored whether impulsivity in OCD patients is a result of the obsessive-compulsive symptoms themselves or other contributing factors. This study aimed to explore whether cognitive emotion regulation strategies and depressive symptoms mediate the relationship between the severity of obsessive-compulsive symptoms and impulsivity in a clinical population with OCD.MethodsThis was a case-control study that recruited 65 OCD patients (male/female=31/34) and 65 healthy controls (male/female =23/42), matched for age, gender, and education level. Demographic and clinical data were collected, and the Yale-Brown Obsessive Compulsive Scale (Y-BOCS), Beck Depression Inventory-II (BDI-II), Barratt Impulsiveness Scale-11 (BIS-11) and Cognitive Emotion Regulation Questionnaire (CERQ) were adopted.ResultsOCD patients scored higher on BIS-11 attentional and non-planning impulsiveness and total scores (all p < 0.05). On CERQ, OCD patients showed elevated maladaptive strategies (self-blame, rumination, catastrophizing, blaming others) and reduced adaptive strategies (positive reappraisal) (all p < 0.05). Attentional impulsiveness positively correlated with OCD severity, depression, and maladaptive strategies (all p < 0.05). Non-planning impulsiveness and BIS-11 total scores positively correlated with depression and negatively with adaptive strategies (all p < 0.05). After adjusting for age, gender, depression level, there was only a significant negative correlation between BIS-11 non-planning impulsiveness and CERQ maladaptive strategies (r = -0.28, p < 0.05). Mediation analysis revealed significant indirect effects of OCD severity on impulsivity via adaptive strategies/depression (β = 0.13, 95% CI: 0.03~0.24, p = 0.012) and via maladaptive strategies/depression (β = 0.09, 95% CI: 0.00~0.23, p = 0.042), but no significant direct or total effects.ConclusionsOCD symptom severity indirectly influences impulsivity through emotion regulation strategies and depressive symptoms, highlighting the need to target these mediators in clinical interventions
Proposition d'amélioration d'un système de retour d'expérience
No full textL’objet de cette communication est de présenter des travaux portant sur le déploiement d’un système de retour d’expérience dans un progiciel PLM (Product Lifecycle Management). Ces travaux sont réalisés en partenariat avec la société Saft Bordeaux, spécialisée dans la conception et la fabrication de systèmes de batteries complexes. Nous commençons par définir la notion de système de retour d’expérience avec ses trois phases clefs (capitalisation, traitement et exploitation) qui le composent. Puis, à l’aide d’un audit réalisé auprès d’une trentaine d’acteurs impliqués dans le développement des produits, nous analysons les pratiques et outils actuellement employés à la Saft. De cette analyse, nous identifions les freins et les attentes des acteurs pour pouvoir réaliser un retour d’expérience efficient.
Enfin, face à ces résultats, nous présentons les principes de la solution mise en oeuvre et les intérêts d’avoir couplé un système REx (Retour d'Expérience) à un PLM. Nous concluons en présentant les perspectives importantes qu’offre un tel travail
Elaboration de nouveaux matériaux à base de sulfates pour l’électrode positive des batteries à ions Li
No full textThe increasing demand of our society for Li-ion batteries calls for the development of positive electrode materials, with specific requirements in terms of energy density, cost, and sustainability. In such a context, we explored four sulfate based compounds: a fluorosulfate – LiCuSO4F, and a family of oxysulfates – Fe2O(SO4)2, Li2Cu2O(SO4)2 and Li2VO(SO4)2. Herein their synthesis, structure, and electrochemical performances are presented for the first time. Being electrochemically inactive, LiCuSO4F displays an ordered triplite structure which is distinct from other fluorosulfates. The electrochemical activity of the oxysulfate compounds was explored towards lithium. Specifically, Fe2O(SO4)2 delivers a sustained reversible capacity of about 125 mA∙h/g at 3.0 V vs. Li+/Li0; Li2VO(SO4)2 and Li2Cu2O(SO4)2 respectively exhibit the highest potential of 4.7 V vs. Li+/Li0 among V- and Cu- based compounds. Last but not least, the Li2Cu2O(SO4)2 phase reveals the possibility of anionic electrochemical activity in a polyanionic positive electrode. Their physical properties, such as ionic conductivities and magnetic properties are also reported. Overall, this makes oxysulfates interesting to study as polyanionic positive electrodes for Li-ion batteries.Le besoin croissant de batteries à ions lithium dans notre société exige le développement de matériaux d'électrode positive, avec des exigences spécifiques en termes de densité énergétique, de coût et de durabilité. Dans ce but, nous avons exploré quatre composés à base de sulfate: un fluorosulfate - LiCuSO4F et une famille d'oxysulfates - Fe2O(SO4)2, Li2Cu2O(SO4)2 and Li2VO(SO4)2. Leur synthèse, structure et performances électrochimiques sont présentées pour la première fois. Étant électrochimiquement inactif, LiCuSO4F présente une structure triplite ordonnée qui est distincte des autres fluorosulfates. L'activité électrochimique des composés oxysulfate a été explorée face au lithium. Plus spécifiquement, Fe2O(SO4)2 délivre une capacité réversible d'environ 125 mA∙h/g à 3.0 V par rapport à Li+/Li0; Li2VO(SO4)2 et Li2Cu2O(SO4)2 présentent respectivement les potentiels les plus élevés de 4.7 V vs. Li+/Li0 parmi les composés à base de V et de Cu. Enfin, la phase Li2Cu2O(SO4)2 révèle la possibilité d'une activité électrochimique anionique dans une électrode positive polyanionique. Leurs propriétés physiques, telles que les conductivités ioniques et les propriétés magnétiques, sont également rapportées. Dans l'ensemble, les oxysulfates sont intéressants à étudier en tant qu'électrodes positives polyanioniques pour les batteries à ions lithium
Phylogenetic relationships and estimation of divergence times among Sisoridae catfishes
No full textNineteen taxa representing 10 genera of Sisoridae were subjected to phylogenetic analyses of sequence data for the nuclear genes Plagl2 and ADNP and the mitochondrial gene cytochrome . The three data sets were analyzed separately and combined into a single data set to reconstruct phylogenetic relationships among Chinese sisorids. Both Chinese Sisoridae as a whole and the glyptosternoid taxa formed monophyletic groups. The genus is likely to be the earliest diverging extant genus among the Chinese Sisoridae. The four species included in the study formed a monophyletic group. was indicated to be earliest diverging glyptosternoid, followed by and . Our data supported the conclusion that and both formed a monophyletic group. On the basis of the fossil record and the results of a molecular dating analysis, we estimated that the Sisoridae diverged in the late Miocene about 12.2 Mya. The glyptosternoid clade was indicated to have diverged, also in the late Miocene, about 10.7 Mya, and the more specialized glyptosternoid genera, such as , originated in the Pleistocene (within 1.9 Mya). The speciation of glyptosternoid fishes is hypothesized to be closely related with the uplift of the Qinghai-Tibet Plateau.Nineteen taxa representing 10 genera of Sisoridae were subjected to phylogenetic analyses of sequence data for the nuclear genes Plagl2 and ADNP and the mitochondrial gene cytochrome . The three data sets were analyzed separately and combined into a single data set to reconstruct phylogenetic relationships among Chinese sisorids. Both Chinese Sisoridae as a whole and the glyptosternoid taxa formed monophyletic groups. The genus is likely to be the earliest diverging extant genus among the Chinese Sisoridae. The four species included in the study formed a monophyletic group. was indicated to be earliest diverging glyptosternoid, followed by and . Our data supported the conclusion that and both formed a monophyletic group. On the basis of the fossil record and the results of a molecular dating analysis, we estimated that the Sisoridae diverged in the late Miocene about 12.2 Mya. The glyptosternoid clade was indicated to have diverged, also in the late Miocene, about 10.7 Mya, and the more specialized glyptosternoid genera, such as , originated in the Pleistocene (within 1.9 Mya). The speciation of glyptosternoid fishes is hypothesized to be closely related with the uplift of the Qinghai-Tibet Plateau
Modélisation de la propagation radio en intérieur pour la prédiction des performances des systèmes radios
No full textThis thesis aims at proposing all the possible enhancements for the Multi-Resolution Frequency-Domain ParFlow (MR-FDPF) model. As a deterministic radio propagation model, the MR-FDPF model possesses the property of a high level of accuracy, but it also suffers from some common limitations of deterministic models. For instance, realistic radio channels are not deterministic but a kind of random processes due to, e.g. moving people or moving objects, thus they can not be completely described by a purely deterministic model. In this thesis, a semi-deterministic model is proposed based on the deterministic MR-FDPF model which introduces a stochastic part to take into account the randomness of realistic radio channels. The deterministic part of the semi-deterministic model is the mean path loss, and the stochastic part comes from the shadow fading and the small scale fading. Besides, many radio propagation simulators provide only the mean power predictions. However, only mean power is not enough to fully describe the behavior of radio channels. It has been shown that fading has also an important impact on the radio system performance. Thus, a fine radio propagation simulator should also be able to provide the fading information, and then an accurate Bit Error Rate (BER) prediction can be achieved. In this thesis, the fading information is extracted based on the MR-FDPF model and then a realistic BER is predicted. Finally, the realistic prediction of the BER allows the implementation of the adaptive modulation scheme. This has been done in the thesis for three systems, the Single-Input Single-Output (SISO) systems, the Maximum Ratio Combining (MRC) diversity systems and the wideband Orthogonal Frequency-Division Multiplexing (OFDM) systems.Cette thèse a pour but de proposer toutes les avancées possibles dans l’utilisation du modèle de propagation Multi-Resolution Frequency-Domain ParFlow (MR-FDPF). Etant un modèle de propagation radio déterministe, le modèle MR-FDPF possède un haut niveau de précision, mais souffre des limitations communes à tous les modèles déterministes. Par exemple, un canal radio réel n’est pas déterministe, mais un processus aléatoire à cause par exemple des personnes ou objets mobiles, et ne peut donc être décrit fidèlement par un modèle purement déterministe. Dans cette thèse, un modèle semi-déterministe est proposé, basé sur le modèle MR-FDPF, qui introduit une part stochastique pour tenir compte des aspects aléatoires du canal radio réaliste. La partie déterministe du modèle est composée du path loss (atténuation d’espace), et la partie stochastique venant du shadow fading (masquage) et du small scale fading (évanouissement). De même, de nombreux simulateurs de propagation radio ne proposent que la prédiction de la puissance moyenne. Mais pour une simulation précise de la propagation radio il convient de prédire également des informations de fading permettant dès lors une prédiction précise du taux d’erreur binaire (BER) potentiel. Dans cette thèse, l’information de fading est déduite des simulations MR-FDPF et par la suite des valeurs réalistes de BER sont données. Enfin, ces données réalistes de BER permettent d’évaluer l’impact de schémas de modulation adaptatifs. Des résultats sont présentés dans trois configurations : systèmes SISO (mono-antenne à l’émission et à la réception), systèmes à diversité de type MRC, et systèmes large bande de type OFDM
Re-Os dating of chalcopyrite from selected mineral deposits in the Kalatag district in the eastern Tianshan Orogen, China
No full textThe Kalatag Cu-Zn-Au district contains a number of economically important Cu deposits in eastern Tianshan in Xinjiang, NW China. Due to the lack of precise mineralization ages, the metallogenesis of this area has long been a matter of debate. In this study, chalcopyrite Re-Os isotope methods are used to date the South Meiling Cu-Zn and Hongshi Cu deposits in the eastern part of Kalatag area. The South Meiling Cu-Zn deposit is hosted in volcanic-sedimentary rocks of the Late Ordovician to Early Silurian Daliugou Formation. The deposit consists of two parts: a concordant massive sulfide ores and discordant vein-type ores located in the footwall strata. The principal ore minerals are pyrite, chalcopyrite, sphalerite, minor tetrahedrite, galena and pyrrhotite. Gangue minerals include quartz, sericite and barite, and minor chlorite, plagioclase and carbonate minerals. The Hongshi Cu deposit represents a hydrothermal vein system hosted in the mafic volcanic rocks of Daliugou Formation. The orebodies are associated with quartz veins and controlled by subsidiary faults of the Kalatag fault. The ore-forming process can be divided into the early, middle and late stages and is characterized by quartz-pyrite, quartz-chalcopyrite-pyrite and quartz-carbonate-gypsum veins, respectively. Re-Os analyses of chalcopyrite from the South Meiling Cu-Zn deposit yield an isochron age of 434.2 +/- 3.9 Ma and initial Os-187/Os-188 ratio of 0.647 +/- 0.098 (MSWD = 0.59). Re-Os analyses of chalcopyrite from the Hongshi Cu deposit yield an isochron age of 431.8 +/- 2.7 Ma and initial Os-187/Os-188 ratio of -0.165 +/- 0.075 (MSWD = 0.77). Since chalcopyrite is the primary copper mineral, we interpret these isochron ages as the timing of Cu mineralization, based on field geology and petrographic evidence. These results suggest that the Re-Os ages presented here provide, for the first time, a direct constraint on an early Paleozoic Cu mineralization event of the eastern Tianshan Orogen. The high initial Os-187/Os-188 ratios (0.647 +/- 0.098) ratio of similar to 434 Ma chalcopyrite from the South Meiling deposit suggest that the metal was sourced from a two end-member mixing of crust and mantle materials. Moreover, we propose that the VMS mineral system and hydrothermal vein system of the Kalatag district were related to the south-dipping subduction of the Kalamaili oceanic plate during the Late Ordovician-Silurian. (C) 2016 Elsevier B.V. All rights reserved.973 Project [2014CB440803]; National Nature Science Foundation of China [41572077, U1139301, 41202064, 41203037]; China Geological Survey Bureau [1212011140056, 12120114081701]SCI(E)[email protected]; [email protected]
Light cues induce protective anticipation of environmental water loss in terrestrial bacteria
No full textThe ecological significance of light perception in nonphotosynthetic bacteria remains largely elusive. In terrestrial environments, diurnal oscillations in light are often temporally coupled to other environmental changes, including increased temperature and evaporation. Here, we report that light functions as an anticipatory cue that triggers protective adaptations to tolerate a future rapid loss of environmental water. We demonstrate this photo-anticipatory stress tolerance in leaf-associated Pseudomonas syringae pv. syringae (Pss) and other plant- and soil-associated pseudomonads. We found that light influences the expression of 30% of the Pss genome, indicating that light is a global regulatory signal, and this signaling occurs almost entirely via a bacteriophytochrome photoreceptor that senses red, far-red, and blue wavelengths. Bacteriophytochrome-mediated light control disproportionally up-regulates water-stress adaptation functions and confers enhanced fitness when cells encounter light prior to water limitation. Given the rapid speed at which water can evaporate from leaf surfaces, such anticipatory activation of a protective response enhances fitness beyond that of a reactive stress response alone, with recurring diurnal wet–dry cycles likely further amplifying the fitness advantage over time. These findings demonstrate that nonphotosynthetic bacteria can use light as a cue to mount an adaptive anticipatory response against a physiologically unrelated but ecologically coupled stress.This article is published as Hatfield, Bridget M., Breah LaSarre, Meiling Liu, Haili Dong, Dan Nettleton, and Gwyn A. Beattie. "Light cues induce protective anticipation of environmental water loss in terrestrial bacteria." Proceedings of the National Academy of Sciences 120, no. 38 (2023): e2309632120. Copyright © 2023 the Author(s). Posted with permission.This article is distributed under Creative Commons Attribution-NonCommercial-NoDerivativesLicense 4.0 (CC BY-NC-ND)
Alphaflexivirus genomes in stony coral tissue loss disease-affected, disease-exposed, and disease-unexposed coral colonies in the U.S. Virgin Islands
No full text© The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Veglia, A., Beavers, K., Van Buren, E., Meiling, S., Muller, E., Smith, T., Holstein, D., Apprill, A., Brandt, M., Mydlarz, L., & Correa, A. Alphaflexivirus genomes in stony coral tissue loss disease-affected, disease-exposed, and disease-unexposed coral colonies in the U.S. Virgin Islands. Microbiology Resource Announcements, 11(2), (2022): e01199–e01121, https://doi.org/10.1128/mra.01199-21.Stony coral tissue loss disease (SCTLD) is decimating Caribbean corals. Here, through the metatranscriptomic assembly and annotation of two alphaflexivirus-like strains, we provide genomic evidence of filamentous viruses in SCTLD-affected, -exposed, and -unexposed coral colonies. These data will assist in clarifying the roles of viruses in SCTLD.This work was supported by the National Science Foundation (Biological Oceanography) award numbers 1928753 to M.E.B. and T.B.S., 1928609 to A.M.S.C., 1928817 to E.M.M., 19228771 to L.D.M., 1927277 to D.M.H., and 1928761 to A.A., as well as by VI EPSCoR (NSF numbers 0814417 and 1946412)
The research and application of electricity economic boom model under the constraint of energy conservation and emission reduction
No full text- …
