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Efficient light-matter interaction lies at the heart of many emerging technologies that seek on-chip integration of solid-state photonic systems. Plasmonic waveguides, which guide the radiation in the form of strongly confined surface plasmon-polariton modes, represent a promising solution to manipulate single photons in coplanar architectures with unprecedented small footprints. Here we demonstrate coupling of the emission from a single quantum emitter to the channel plasmon polaritons supported by a V-groove plasmonic waveguide. Extensive theoretical simulations enable us to determine the position and orientation of the quantum emitter for optimum coupling. Concomitantly with these predictions, we demonstrate experimentally that 42% of a single nitrogen-vacancy centre emission efficiently couples into the supported modes of the V-groove. This work paves the way towards practical realization of efficient and long distance transfer of energy for integrated solid-state quantum systems. The confined surface plasmon-polariton modes in plasmonic waveguides are a promising platform for single-photon manipulation in small, coplanar architectures. Here, Bermúdez Ureña et al . demonstrate efficient coupling of a single quantum emitter to the supported modes of a V-groove plasmonic waveguide.

Loneliness is an increasingly significant social and public health issue in contemporary societies. The available evidence suggests that social support is one of the key psychosocial processes for the reduction and prevention of loneliness. This study investigated the role played by sources of social support in the experience of social and emotional loneliness, identifying seven sources of support split between family (spouse/partner, children, grandchildren, siblings) and non-family (friends, neighbours). The study population comprised people aged 65 years and over living in Spain, with a partner (without cohabiting children), alone or in a nursing home. A mixed-methods approach was used, combining data from a survey involving 887 participants (quantitative phase) and data from semi-structured interviews with 30 older adults (qualitative phase). The relationship between the various sources and loneliness was analysed using structural equation modelling (SEM) for the survey data and thematic analysis for the qualitative information. The results from both phases of the study suggest different association dynamics between sources of social support and the social and emotional dimensions of loneliness. Lower levels of emotional loneliness were related to support from the following sources: spouse, children, grandchildren, siblings and friends. Lower levels of social loneliness were related to support from the following sources: spouse, grandchildren, siblings and friends. In contrast, greater levels of emotional loneliness were related to support from neighbours and greater levels of social loneliness were related to support from children. The findings of this study contribute to a better understanding of the association between social support and loneliness and suggest that interventions aimed at reducing loneliness could be more effectively targeted by considering the specific effects of support derived from different sources.

Background The association between socioeconomic status and depression is weaker in older adults than in younger populations. Loneliness may play a significant role in this relationship, explaining (at least partially) the attenuation of the social gradient in depression. The current study examined the relationship between socioeconomic status and depression and whether the association was affected by loneliness. Methods A cross-sectional design involving dwelling and nursing homes residents was used. A total of 887 Spanish residents aged over 64 years took part in the study. Measures of Depression (GDS-5 Scale), Loneliness (De Jong-Gierveld Loneliness Scale), Socioeconomic Status (Education and Economic Hardship), and sociodemographic parameters were used. The study employed bivariate association tests (chi-square and Pearson’s r) and logistic regression analyses. Results The percentage of participants at risk of suffering depression was significantly higher among those who had not completed primary education (45.5%) and significantly lower among those with university qualifications (16.4%) (X 2  = 40.25; p  <.001), and respondents who could not make ends meet in financial terms faced a higher risk of depression (X 2  = 23.62; p  <.001). In terms of the respondents who experienced loneliness, 57.5% were at risk of depression, compared to 19% of those who did not report loneliness (X 2  = 120.04; p  <.001). The logistic regression analyses showed that having university qualifications meant a 47% reduction in the risk of depression. This risk was 86% higher among respondents experiencing financial difficulties. However, when scores for the loneliness measure were incorporated, the coefficients relating to education and economic hardships ceased to be significant or were significantly reduced. Conclusion Loneliness can contribute to explaining the role played by socioeconomic inequalities in depression among older adults.

This study analysed the association between income inequality and depression from a multilevel perspective among older adults in Europe, including an examination of the role of social support. The data came from Eurostat’s European Health Interview Survey (EHIS). Selected participants were aged 65 years or above (n = 68,417) and located in 24 European countries. The outcome variable (depression) was measured using the eight-item Patient Health Questionnaire (PHQ-8). The resulting dataset included individual-level (level-1) and aggregate-level (level 2) exposure variables. Level-1 included income quintiles and social support as exposure variables and sex, age, living alone, limitation in activities of daily living and general activity limitation as control variables. Level 2 included the Gini coefficient, healthcare expenditure and dependency ratio. A multilevel linear regression analysis was performed with maximum likelihood (ML) estimation. All the income quintiles from 1 to 4 showed higher average scores for depression than quintile 5 (the highest). Higher social support scores were associated with lower scores for depression. An interaction was found between income quintile and social support, with higher levels of social support associated with lower scores for depression in quintiles 1 and 2. Higher Gini coefficient scores were associated with higher scores for depression. A significative random slope for social support was also found, meaning that the relationship between social support and depression differed across countries. No significant interaction was found between the Gini coefficient and social support. The study findings suggest that more unequal societies provide a less favourable context for the mental health of older adults. There are also significant country-dependent differences in terms of the relationship between support and mental health among older adults.

Here, we introduce the concept of magnetic localized surface plasmons (LSPs), magnetic dipole modes that are supported by cylindrical metal structures corrugated by very long, curved grooves. The resonance wavelength is dictated by the length of the grooves, allowing us to tune it to values much larger than the size of the particle. Moreover, magnetic LSPs also exist for extremely thin metal disks and, therefore, they could be used to devise metasurfaces with magnetic functionalities. Experimental evidence of the existence of these magnetic LSPs in the microwave regime is also presented, although the concept is very general and could be applied to terahertz or infrared frequencies.

IntroductionAbout 25% of patients with COVID-19 develop acute respiratory distress syndrome (ARDS) associated with a high release of pro-inflammatory cytokines such as interleukin-6 (IL-6). The aim of the SARICOR study is to demonstrate that early administration of sarilumab (an IL-6 receptor inhibitor) in hospitalised patients with COVID-19, pulmonary infiltrates and a high IL-6 or D-dimer serum level could reduce the progression of ARDS requiring high-flow nasal oxygen or mechanical ventilation (non-invasive or invasive).Methods and analysisPhase II, open-label, randomised, multicentre, controlled clinical trial to study the efficacy and safety of the administration of two doses of sarilumab (200 and 400 mg) plus best available therapy (BAT) in hospitalised adults with COVID-19 presenting cytokine release syndrome. This strategy will be compared with a BAT control group. The efficacy and safety will be monitored up to 28 days postadministration. A total of 120 patients will be recruited (40 patients in each arm).Ethics and disseminationThe clinical trial has been approved by the Research Ethics Committee of the coordinating centre and authorised by the Spanish Agency of Medicines and Medical Products. If the hypothesis is verified, the dissemination of the results could change clinical practice by increasing early administration of sarilumab in adult patients with COVID-19 presenting cytokine release syndrome, thus reducing intensive care unit admissions.Trial registration numberNCT04357860.

Previous research has shown that social workers are a profession at risk of suffering a high incidence of so-called burnout syndrome. Burnout is in turn related to psychological distress. Social support from informal sources is a factor with potential to reduce the psychological distress caused by burnout. However, the previous research has not considered informal social support in sufficient detail. This article, using a cross-sectional study, analyses the relationship between burnout, informal social support and psychological distress in a sample of social workers in Spain (n = 189). The results show a high incidence of psychological distress and burnout, above all in terms of Emotional Exhaustion (EE). The results of the hierarchical regression analysis confirm the importance of informal social support as a variable negatively related to distress, even in the presence of burnout. Surprisingly, organisational variables were not associated with distress. Longitudinal and qualitative research is necessary to examine the nature of this relationship in detail.

In recent years, research has noted the increasing prevalence of mental health problems among university students. The current mental health needs of the university population, along with the multitude of stressors they face, have increased the importance of examining their psychological well-being and determining the personal resources that effectively promote it. In this context, the present research aims to analyze the roles of psychological capital (PsyCap) and coping strategies as personal resources that are significantly related to the psychological well-being (PWB) of university students. Specifically, the mediating roles of various coping strategies (both adaptive and maladaptive) in the relationship between PsyCap and PWB are explored. The study involves 391 university students from Spain. The results show partial mediation effects of adaptive coping strategies (cognitive restructuring and social support) on the relationship between PsyCap and PWB. Likewise, PsyCap is shown to be a direct positive predictor of adaptive coping strategies and PWB, as well as a direct negative predictor of maladaptive coping strategies (self-criticism). Therefore, it is concluded that PsyCap and some adaptive coping strategies serve as valuable personal resources that predict PWB in university students. PsyCap is also associated with a lower tendency to engage in maladaptive coping strategies, such as self-criticism. Similarly, the use of cognitive restructuring and/or social support is related to high levels of PWB among university students.

Interacting with other roads users is a challenge for an autonomous vehicle, particularly in urban areas. Existing vehicle systems behave in a reactive manner, warning the driver or applying the brakes when the pedestrian is already in front of the vehicle. The ability to anticipate a pedestrian’s crossing intention ahead of time will result in safer roads and smoother vehicle maneuvers. The problem of crossing intent forecasting at intersections is formulated in this paper as a classification task. A model that predicts pedestrian crossing behaviour at different locations around an urban intersection is proposed. The model not only provides a classification label (e.g., crossing, not-crossing), but a quantitative confidence level (i.e., probability). The training and evaluation are carried out using naturalistic trajectories provided by a publicly available dataset recorded from a drone. Results show that the model is able to predict crossing intention within a 3-s time window.

The theory of image formation in a microscope proposed by Ernst Abbe changed the scientific approach to microscopy. Though the theory had many detractors, his new approach led to a technological revolution in the design and construction of high-quality microscopes. It paved the way for new discoveries in the fields of biology and medicine. Joaquín María de Castellarnau, was a contemporary connoisseur of Abbe’s ideas who decided to disseminate them in Spain through various publications and training courses. In his lectures, he used various devices for practical demonstrations that allowed some concepts of the new theory to be better understood. At the Museo Nacional de Ciencias Naturales in Madrid (MNCN–CSIC), one such original and unusual instrument designed by Abbe and used by Castellarnau has been preserved in perfect condition. Castellarnau used this instrument for various experiments that helped clarify the most complex points of Abbe’s theory. In this work, we explore how the context in which science developed in Spain favoured practical activities to demonstrate new scientific theories, such as Abbe’s in the early twentieth century.