Artificial neural-network technique for precipitation nowcasting from satellite imagery

The term nowcasting reflects the need of timely and accurate predictions of risky situations related to the development of severe meteorological events. In this work the objective is the very short term prediction of the rainfall field from geostationary satellite imagery entirely based on neural network approach. The very short-time prediction (or nowcasting) process consists of two steps: first, the infrared radiance field measured from geostationary satellite (Meteosat 7) is projected ahead in time (30 min or 1 h); secondly, the projected radiances are used to estimate the rainfall field by means of a calibrated microwave-based combined algorithm. The methodology is discussed and its accuracy is quantified by means of error indicators. An application to a satellite observation of a rainfall event over Central Italy is finally shown and evaluated

Rainfall rate retrieval in presence of path attenuation using C-band polarimetric weather radars

Weather radar systems are very suitable tools for the monitoring of extreme rainfall events providing measurements with high spatial and temporal resolution over a wide geographical area. Nevertheless, radar rainfall retrieval at C-band is prone to several error sources, such as rain path attenuation which affects the accuracy of inversion algorithms. In this paper, the so-called rain profiling techniques (namely the surface reference method FV and the polarimetric method ZPHI) are applied to correct rain path attenuation and a new neural network algorithm is proposed to estimate the rain rate from the corrected measurements of reflectivity and differential reflectivity. A stochastic model, based on disdrometer measurements, is used to generate realistic range profiles of raindrop size distribution parameters while a T-matrix solution technique is adopted to compute the corresponding polarimetric variables. A sensitivity analysis is performed in order to evaluate the expected errors of these methods. It has been found that the ZPHI method is more reliable than FV, being less sensitive to calibration errors. Moreover, the proposed neural network algorithm has shown more accurate rain rate estimates than the corresponding parametric algorithm, especially in presence of calibration errors

Assessing radiative transfer models trained by numerical weather forecasts using sun-tracking radiometric measurements for satellite link characterization up to W band

Radio communications, and in particular Earth-to-satellite links, are worldwide used for delivering digital services. The bandwidth demand of such services is increasing accordingly to the advent of more advanced applications (e.g., multimedia services, deep-space explorations, etc.) thus pushing the scientific community toward the investigation of channel carriers at higher frequencies. When using carrier frequencies above X band, the main drawback is how to tackle the impact of tropospheric processes (i.e., rain, cloud, water vapor). This work assesses the joint use of weather forecast models, radiative transfer models and Sun-tracking radiometric measurements to explore their potential benefits in predicting path attenuation and sky noise temperature for slant paths at frequencies between K and W band, thus paving the way to the optimization of satellite link-budgets

Suicidal behavior in individuals accused or convicted of child sex abuse or indecent image offenses: systematic review of prevalence and risk factors

Objective An emerging body of research indicates that child sex abuse (CSA) offenders are at high risk of suicide when their offenses come to light and that those accused of accessing indecent images of children (IIOC) are at particular risk. Methods We conducted a systematic review and narrative synthesis on suicide rates and risk factors in this population of offenders. A keyword search of bibliographic databases (PsycINFO, Ovid, MEDLINE, Embase, PILOTS, SCIE, the Cochrane Central Register of Controlled Trials [CENTRAL] and CINAHL) was conducted. Results Eighteen articles were included in the review, with eleven studies meeting criteria for quality assessment. The risk of suicide in perpetrators of CSA and IIOC might be over 100 times that of the general population, although estimates vary widely between studies. Several complex, interlinking factors were identified as associated with risk, including shame, unique demographic characteristics of the offenders, absence of prior criminal contact, and the impact of a criminal investigation. Conclusions The review identified factors that may have practical, clinical, and operational implications in the prevention of suicide in CSA and IIOC perpetrators. Exploring the impact of the investigation itself on suicide risk, including potential operational strategies and clinical input to reduce risk, should be a priority

A sanctuary of tranquillity in a ruptured world: evaluating long-term counselling at a women’s community health centre

The longitudinal study described in this article evaluated long-term counselling provided at a women’s health centre in the UK for service users on low incomes. The article focuses on the qualitative aspect of the study in which 59 women were interviewed individually before and/or after their counselling. The interviews explored how women make sense of long-term counselling in the context of their gendered experiences and complex needs. The data were analysed using thematic analysis informed by a feminist orientation and attachment theory. Four main themes emerged:‘violence and loss in the context of female oppression’, ‘a sanctuary for women’, ‘non-medicalised long-term counselling in a safe setting’, and ‘benefits of the long view’. Participants attributed various benefits to receiving long-term counselling in a women-only environment. These included gaining employment; reduced suicidal ideation, anxiety and depression; improved physical health, improved confidence and being able to make positive changes in their relationships. The women interviewed post-counselling valued long term-counselling in this context, in contrast to short-term therapy in a medicalised environment. Wider implications with regards to clinical practice and research are discussed

Evaluation of long-term counselling at a community health service for women who are on a low income

Aims. Given the lack of research evaluating long-term counselling, coupled with the lack of women-only counselling services, the present study evaluated the long-term counselling service offered by a women-only community health centre. Method. The research ascertained: 1) the characteristics of 155 service users pre-counselling, 2) the views and experiences of 75 service users post-counselling and 3) pre-post-counselling clinical change in 98 service users via the Clinical Outcomes in Routine Evaluation - Outcome Measure (CORE-OM). Results. Unemployment, low income and reports of abuse were related to poorer mental health as measured by the CORE-OM. Content analysis of open-ended questions revealed that women felt supported, comfortable and gained insight through the counselling relationship. They also reported positive changes in their lives, relationships, health behaviours, and psychological wellbeing. Post-counselling improvements were found in CORE-OM scores. Conclusions. Long-term counselling in a women-only environment for socially disempowered women may be beneficial. A research-informed approach to counselling and therapy evaluation, which acknowledges the social context of psychological distress, should be taken across institutions

Ketamine treatment for individuals with treatment-resistant depression: a longitudinal qualitative interview study of patient experiences

Background Ketamine has recently received considerable attention regarding its antidepressant and anti-suicidal effects. Trials have generally focused on short-term effects of single intravenous infusions. Research on patient experiences is lacking. Aims To investigate the experiences over time of individuals receiving ketamine treatment in a routine clinic, including impacts on mood and suicidality. Method Twelve fee-paying patients with treatment-resistant depression (6 females, 6 males, age 21-70 years; 11 reporting suicidality and six self-harm) who were assessed as eligible for ketamine treatment participated in up to three semi-structured interviews: before treatment started, a few weeks into treatment and two or more months later. Data were analysed thematically. Results Most participants hoped that ketamine would provide respite from their depression. All experienced improvement in mood following initial treatments, ranging from negligible to dramatic, and eight a reduction in suicidality. Improvements were transitory for most participants, although two experienced sustained consistent benefit and two had sustained but limited improvement. Some participants described hopelessness when treatment stopped working, paralleled by increased suicidal ideation for three. The transient nature and cost of treatment were problematic. Eleven participants experienced side-effects, which in two cases were significant. Suggestions for improving treatment included closer monitoring and adjunctive psychological therapy. Conclusions Ketamine treatment was generally experienced as effective in improving mood and reducing suicidal ideation in the short-term, but the lack of longer-term benefit was challenging for participants, as was treatment cost. Informed consent procedures should refer to the possibilities of relapse and of associated increased hopelessness and suicidality