Equation of state of cubic boron nitride at high pressures and temperatures

We report accurate measurements of the equation of state (EOS) of cubic boron nitride by x-ray diffraction up to 160 GPa at 295 K and 80 GPa in the range 500-900 K. Experiments were performed on single-crystals embedded in a quasi-hydrostatic pressure medium (helium or neon). Comparison between the present EOS data at 295 K and literature allows us to critically review the recent calibrations of the ruby standard. The full P-V-T data set can be represented by a Mie-Gr\"{u}neisen model, which enables us to extract all relevant thermodynamic parameters: bulk modulus and its first pressure-derivative, thermal expansion coefficient, thermal Gr\"{u}neisen parameter and its volume dependence. This equation of state is used to determine the isothermal Gr\"{u}neisen mode parameter of the Raman TO band. A new formulation of the pressure scale based on this Raman mode, using physically-constrained parameters, is deduced.Comment: 8 pages, 7 figure

A bilingual emotional advantage? An investigation into the effects of psychological factors in emotion perception in Arabic and in English of Arabic-English bilinguals and Arabic /English monolinguals

Aims and objectives: While the debate on the cognitive bilingual advantage is ongoing, much less attention has been paid to a potential emotional advantage of bilinguals. The present study compared the performance of bilinguals and monolinguals in emotion perception (EP) in Arabic and in English and the differences in trait emotional intelligence (Trait EI). It also considered the relationship between Trait EI and EP scores. Methodology: 205 Arabic-English bilinguals, 71 Arabic monolinguals and 333 English monolinguals had to recognise anger, fear, sadness, disgust, surprise and happiness in twelve short audio-visual video clips (six in English and six in Arabic) embedded in an online questionnaire. The clips contained short conversations about day-to-day situations. Data and analysis: Nonparametric statistical analyses were used to explore the differences between bilinguals and monolinguals in EP in English and Arabic and to explore the relationship between Trait EI and EP. Findings: Bilinguals outperformed English monolinguals in the EP task in English but did not perform better than Arabic monolinguals in Arabic. Bilinguals scored higher on Trait EI than monolinguals, and Trait EI scores were significantly and positively correlated with EP scores. Originality: This study suggests that there is a small bilingual advantage for emotional and psychological domains. Significance: Bilingualism seems to have an effect on some personality dimensions and emotional skills

Shape-selective zeolite catalysis for bioplastics production

Biodegradable and renewable polymers, such as polylactic acid, are benign alternatives for petrochemical-based plastics. Current production of polylactic acid via its key building block lactide, the cyclic dimer of lactic acid, is inefficient in terms of energy, time, and feedstock use. We present a direct zeolite-based catalytic process, which converts lactic acid into lactide. The shape-selective properties of zeolites are essential to attain record lactide yields, outperforming those of the current multistep process by avoiding both racemization and side-product formation. The highly productive process is strengthened by facile recovery and practical reactivation of the catalyst, which remains structurally fit during at least six consecutive reactions, and by the ease of solvent and side-product recycling

Mechanisms of Peptide Oxidation by Hydroxyl Radicals: Insight at the Molecular Scale

Molecular dynamics (MD) simulations were performed to provide atomic scale insight in the initial interaction between hydroxyl radicals (OH) and peptide systems in solution. These OH radicals are representative reactive oxygen species produced by cold atmospheric plasmas. The use of plasma for biomedical applications is gaining increasing interest, but the fundamental mechanisms behind the plasma modifications still remain largely elusive. This study helps to gain more insight in the underlying mechanisms of plasma medicine but is also more generally applicable to peptide oxidation, of interest for other applications. Combining both reactive and nonreactive MD simulations, we are able to elucidate the reactivity of the amino acids inside the peptide systems and their effect on their structure up to 1 μs. Additionally, experiments were performed, treating the simulated peptides with a plasma jet. The computational results presented here correlate well with the obtained experimental data and highlight the importance of the chemical environment for the reactivity of the individual amino acids, so that specific amino acids are attacked in higher numbers than expected. Furthermore, the long time scale simulations suggest that a single oxidation has an effect on the 3D conformation due to an increase in hydrophilicity and intra- and intermolecular interactions

Attitudes towards code-switching among adult mono- and multilingual language users

The present study investigates inter-individual variation (linked to personality traits, multilingualism and sociobiographical variables) in attitudes towards code-switching (CS) among 2070 multilinguals. Data were collected through an on-line questionnaire. We found that high levels of Tolerance of Ambiguity and Cognitive Empathy, and low levels of Neuroticism are linked with significantly more positive attitudes towards CS. Knowing many languages had a marginally positive effect. A more fine-grained analysis revealed that participants with mid-range global proficiency values were less positive towards CS than those at the lower and higher end of the scale. Participants who grew up in a bilingual family and in an ethnically diverse environment, and currently worked in an ethnically diverse environment had significantly more positive attitudes towards CS. Female participants and those with the lowest and highest levels of education appreciated CS most, and participants in their teens and twenties appreciated CS less than older participants. The findings thus show that the attitudes towards CS are linked to personality, language learning history and current linguistic practices, as well as some sociobiographical variables

The relationship between bi/multilingualism, nativeness, proficiency and multimodal emotion recognition ability

Aims and Objectives: The primary aim of this study is to investigate the relationship between visual–vocal–verbal emotion recognition ability (ERA) and multilingualism – that is, both bilingual first language (L1) acquisition and the level of multilingualism operationalised as the number of languages one can speak. Besides these two factors, we also consider nativeness and proficiency as possible predictors of ERA. Methodology: One-thousand-two-hundred-and-twenty participants completed a survey online consisting of a sociobiographical background questionnaire, an English lexical test and an emotion recognition test including six stimuli. For each of the six audiovisual recordings, participants had to indicate which emotion they thought the L1 English speaker was conveying – happiness, sadness, anger, (positive) surprise, fear, disgust or no/neutral emotion. Data and Analysis: An individual ERA score was calculated for each participant. Correlations between ERA and the different variables were computed – including interactions – and significant correlations were fed into a linear regression model. Findings: The number of spoken languages was unrelated to ERA in our sample. The data revealed an interaction between BFLA and nativeness: bi/multilingually raised English second or foreign language (LX) users outperformed monolingually raised LX users, but bi/multilingually raised L1 users of English scored lower than monolingually raised L1 users. Proficiency was significantly related to ERA. Originality: This study points to a bilingual advantage in emotion recognition in English for participants with specific linguistic profiles. Participants who grew up with two languages from birth had an advantage if it did not include English. The advantage seemed to be cancelled out among bi/multilingually raised English L1 users, possibly due to interferences from their other L1(s) or L1 culture(s). Significance: This study contributes to the scarce literature on bilingual advantage in the affective domain and offers a nuanced view on bilingualism and ERA

Hematological changes among Beninese motor-bike taxi drivers exposed to benzene by urban air pollution

Exposure to high-concentration of benzene in polluted air has been associated with bone marrow deficiency, aplastic anemia and leukemia. However, epidemiological studies have reported conflicting data following human exposure to benzene levels below 1 ppm (that is, 3.2 mg/m3). Therefore we investigated the influence of outdoor air benzene on peripheral blood cells among exposed motor-biketaxi drivers (MBTD) in which specific IgG antibodies against reactive benzene metabolites, such as hydroquinone (HQ) and para-benzoquinone (p-BQ) are identified and quantified for further use as biomarker of exposure. We compared 144 MBTD with 30 unexposed age and sex-matched controls. The mean age ± SD (95% CI) were: MBTD 39.5 ± 7.82 (38.2 - 40.7) and village residents 40.3 ± 10.56 (39.1-43.0). Personal benzene exposure was assessed using GABIE diffusive samplers. The levels of specific IgG antibodies to HQ and p-BQ were determined by ELISA. The peripheral blood cells were counted by an automated analyzer. Benzene, Toluene and Xylene levels were much higher in MBTD in comparison to the control group. Benzene exposure levels ranged from 0.012 to 0.550 ppm in MBTD. Their average exposure level per one week was 0.126±0.206 ppm. Accordingly, MBTD had significantly higher levels of specific IgG antibodies to HQ and p-BQ compared to the controls (p< 0.001). WBC, lymphocytes, eosinophils and platelets were significantly decreased in MBTD, whereas RBC and other blood cell numbers remained unchanged. Total WBC, lymphocytes and eosinophils counts were decreased among exposed MBTD compared to unexposed controls. We suggest the use of these blood parameters together with specific IgG antibodies to HQ and p-BQ as biomarkers in biological monitoring of low level benzene exposure. Larger studies are however required to validate this new approach of health survey in workers exposed to benzene.Key words: Benzene, motor-bike-taxi drivers, specific immune responses, peripheral blood cell count

The effect of perception of teacher characteristics on Spanish EFL Learners’ anxiety and enjoyment

The present study explores the relationship between Foreign Language Enjoyment (FLE) and Foreign Language Classroom Anxiety (FLCA) and a number of teacher-centered variables within the Spanish classroom context. Participants were 210 former and current EFL learners from all over Spain who filled out an online questionnaire with Likert scale items. A moderate negative relationship emerged between FLE and FLCA. Participants who had a L1 user of English as teacher reported more FLE and less FLCA than those with a foreign language user of English. Teacher characteristics predicted close to 20% of variance in FLE but only 8% of variance in FLCA. The strongest positive predictor of FLE was teacher’s friendliness while teacher’s foreign accent was a weaker negative predictor. Teacher-centered variables predicted much less variance for FLCA. Participants experienced more FLCA with younger teachers, very strict teachers and teachers who did not use the FL much in class. The findings confirm earlier research that FLE seems to be more dependent on the teachers’ pedagogical skills than FLCA (Dewaele & MacIntyre, 2019a; Dewaele et al., 2018)

Effect of nanostructuration on compressibility of cubic BN

Compressibility of high-purity nanostructured cBN has been studied under quasi-hydrostatic conditions at 300 K up to 35 GPa using diamond anvil cell and angle-dispersive synchrotron X-ray powder diffraction. A data fit to the Vinet equation of state yields the values of the bulk modulus B0 of 375(4) GPa with its first pressure derivative B0' of 2.3(3). The nanometer grain size (\sim20 nm) results in decrease of the bulk modulus by ~9%