cold plasma pretreatment of carbon fibre composite substrates to improve adhesive bonding performance

The purpose of the paper is to investigate the effects of low pressure plasma treatment on wettability of carbon fibre reinforced polymer samples and on shear properties of adhesive bonded joints based on these substrates. In particular, two plasma process parameters, exposure time and power input, were optimized, performing contact angle evaluation on lap-shear tests. The plasma treatment was also compared with a conventional mechanical abrasion and untreated and only degreased specimens. The experimental results show that choosing the optimal parameters is possible to improve the wettability of composite substrates and reduce the contact angle

Hybrid FSWeld-bonded joint fatigue behaviour

Aluminium alloys, widely used in aeronautics, are increasingly involved in the automotive industry due to the good relationship between mechanical strength and specific weight. The lightening of the structures is the first objective, which allows the decreasing in the weight in motion. The use of aluminium alloys has also seen the introduction of the Friction Stir Welding (FSW) technique for the production of structural overlapping joints. FSW allows us to weld overlap joints free from defects, but with the presence of a structural notch further aggravated by the presence of a "hook" defect near the edge of the weld. Furthermore, FSW presents a weld penetration area connected to the tool geometry and penetration. The experimental activity will be focused on the combination of two different joining techniques, which can synergistically improve the final joint resistance. In particular, the welding and bonding process most commonly known as weld-bonding is defined as a hybrid process, as it combines two different junction processes. In this paper we analyse FSWelded AA6082 aluminium alloy overlapped joint with the aim of quantitatively evaluating the improvement provided by the presence of an epoxy adhesive between the plates. After optimising the weld-bonding process, the mechanical behaviour of welded joints will be analysed by static and dynamic tests. The presence of the adhesive should limit the negative effect of the structural notch inevitable in a FSW overlapped joint

Laser surface texturing of polypropylene to increase adhesive bonding

In this paper, the main parameters of laser surface texturing of polymeric substrates have been studied. The final aim of the texturing is to increase the performance of bonded joints of grey-pigmented polypropylene substrates. The experimental investigation was carried out starting from the identification of the most effective treatment parameters, in order to achieve a good texture without compromising the characteristics of the bulk material. For each of these parameters, three values were individuated and 27 sets of samples were realised. The surface treatment was analysed and related to the mechanical characteristics of the bonded joints performing lap-shear tests. A statistical analysis in order to find the most influential parameter completed the work

Th17 involvement in nonalcoholic fatty liver disease progression to non-alcoholic steatohepatitis

The nonalcoholic fatty liver disease (NAFLD) is the hepatic manifestation of the metabolic syndrome. NAFLD encompasses a wide histological spectrum ranging from benign simple steatosis to non-Alcoholic steatohepatitis (NASH). Sustained inflammation in the liver is critical in this process. Hepatic macrophages, including liver resident macropaghes (Kupffer cells), monocytes infiltrating the injured liver, as well as specific lymphocytes subsets play a pivotal role in the initiation and perpetuation of the inflammatory response, with a major deleterious impact on the progression of fatty liver to fibrosis. During the last years, Th17 cells have been involved in the development of inflammation not only in liver but also in other organs, such as adipose tissue or lung. Differentiation of a naïve T cell into a Th17 cell leads to pro-inflammatory cytokine and chemokine production with subsequent myeloid cell recruitment to the inflamed tissue. Th17 response can be mitigated by T regulatory cells that secrete anti-inflammatory cytokines. Both T cell subsets need TGF-β for their differentiation and a characteristic plasticity in their phenotype may render them new therapeutic targets. In this review, we discuss the role of the Th17 pathway in NAFLD progression to NASH and to liver fibrosis analyzing different animal models of liver injury and human studies.Instituto Multidisciplinario de Biología Celula

Health Workers' Burnout and COVID-19 Pandemic: 1-Year after-Results from a Repeated Cross-Sectional Survey

: (1) Background: This study evaluates, one year later, the levels of burnout, anxious-depressive, and post-traumatic symptoms and the general health status in the Health Workers (HWs) involved in the SARS-COVID-19 pandemic in the Novara area. (2) Methods: The survey was sent via a link in an email to doctors, nurses, and other operators during the period between June and August 2021. The survey collected socio-demographic data and contained some self-administered questionnaires. (3) Results: A total of 688 HWs completed the survey, 53% were aged 30-49 years, 68% were female, 76% were cohabiting, 55% had children, 86% reported family habit changes, and 20% had non-COVID related health problems. Only a few of the respondents had a follow-up by a specialist (12%), of which there were even less in recent times (6%). It was observed that the respondents had undergone burnout; a poor state of general mental health (62%); depressive symptoms (70%); post-traumatic symptoms (29%); and less frequently, anxious symptoms (16%). The data of this study are in line with other studies in the literature. (4) Conclusions: The data indicate that psychological-based suffering was no longer markedly concentrated in some specific bands of HWs. In conclusion, it would be essential to enhance HW support strategies

Effect of fibre laser marking on surface properties and corrosion resistance of a Fe-Ni-Cr alloy

Fiber laser techniques are increasing their use in many applications, including modification of material surface properties. In particular they are often used for materials' marking as a non-contact processing. In spite of this, the impact of the laser beam on the surface causes metallurgical and morphological changes. The developments during the laser-material interaction can also affect other surface properties, especially corrosion properties which are crucial in the case of Iron-Nickel alloys. Effect of laser marking on a Fe-Cr-Ni alloy using a Tm-fibre laser (IPG Photonics TRL1904; maximum power: 50W, wavelength: 1904 nm), is described in this paper. In order to evaluate the effect of the laser on corrosion properties a specific ageing test in salt spray has been performed. Moreover, superficial morphology analyses have been performed on samples before and after corrosion tests. Possibilities and limitations of laser marking on these alloys have been discussed, in particular from the point of view of the marked surface corrosion resistance preservation

Attempted Suicide in the Older Adults: A Case Series From the Psychiatry Ward of the University Hospital Maggiore Della Carità, Novara, Italy

: Introduction: As suicide rates increase with age, it is mandatory to carefully assess old age suicidal behaviors. Our aim was to describe the main socio-demographic and clinical features of a sample of suicide attempters aged 65 years and older, and to assess differences within the sample (men vs. women; patients with vs. without a previous history of suicide attempt; patients with vs. without a previous psychiatric history). Methods: Retrospective study conducted at the Maggiore della Carità University Hospital, Novara, Italy. Results: A higher percentage of female patients in our sample were treated by or referred to mental health services, while a greater percentage of male patients required a prolonged clinical observation in the Emergency Room (ER) or in non-psychiatric wards before psychiatric admission. The percentage of patients without previous psychiatric history taking anxiolytic and sedative medications was 25%. Conclusion: It is likely that different clusters and types of suicide attempters exist. Women in our sample appeared more proactive in asking for help, and more likely to be already treated by or referred to a psychiatric service, suggesting the need to facilitate the access to psychiatric services for the male population aged 65 years and older, or to offer support and care for the non-psychiatric reasons (comorbidities, pain, and loss of autonomy) possibly underlying suicidal behavior in this specific group. The use of medications deserves more attention considering the possible critical diagnostic issues in this age group

Laser welding of polypropylene using two different sources

In this paper, laser weldability of neutral polypropylene has been investigated using fibre and carbon dioxide lasers. A design of experiment (DoE) was conducted in order to establish the influence of the main working parameters on the welding strength of the two types of laser. The welded samples were characterized by carrying out visual and microscopic inspection for the welding morphology and cross-section, and by distinguishing the tensile strength. The resulting weld quality was investigated by means of optical microscopy at weld cross-sections. The tensile strength of butt-welded materials was measured and compared to that of a corresponding bulk material

Mental Health Impact and Burnout in Critical Care Staff During Coronavirus Disease 2019 Outbreak

Objective: The coronavirus disease 2019 outbreak exposed intensive care unit health care workers to a psychological burden. The aim of the study was to assess burnout, depression, anxiety, and post-traumatic stress symptoms in the intensive care unit staff during the pandemic period and to focus on the factors that contributed to psychological discomfort by using validated psychometric tools.Methods: This was a monocentric study developed at the end of the first emergency crisis period (May 2020). We used a custom-designed survey using SurveyMonkey. The first part of the online survey included 27 general questions (sociodemographic information, the professional role, and possible changes assigned in job tasks and duties), the second part included validated psychometric tools: Maslach Burnout Inventory, General Health Questionnaire-12 Items, Impact of Event Scale, Beck Anxiety Inventory, and Beck Depression Inventory-II. Factors independently associated with reported symptoms of mental health disorders were identified.Results: The response rate was 88%, with 95 respondents. Depressive and mild-moderate anxiety symptoms were reported in 20% and in 12% of health care workers, respectively, and half of the sample experienced moderate or severe post-traumatic stress symptoms. In total, 64% of health care workers reported high levels of burnout. General mental health problems were more frequently reported by women (P =.3), by those who were tested negative for the coronavirus disease 2019 buffer (P <.02), and by those who changed their family habits (P =.02) as a consequence of the pandemic. Being single or divorced (P =.04) was associated with the presence of depressive symptoms; vice versa, cohabiting with a partner or being married was associated with lower levels of depression. Anxious symptoms were reported in health care workers with no previous working experience in the intensive care unit.Conclusions: Health care workers experience high levels of psychological burden during the coronavirus disease 2019 pandemic. Knowing the risk factors can aid to develop strategies of observation and prevention and also strengthen the ability to be resilient to stressful situations

Suicidal Behaviors in Patients Admitted to Emergency Department for Psychiatric Consultation: A Comparison of the Migrant and Native Italian Populations Between 2008 and 2015

In recent decades, Italy has become a desirable destination for immigrants. In 2014, five million people (8.2% of the population) were migrants (regular/irregular, documented/undocumented). This study looks at psychiatric health, an important feature especially for first‐generation migrants and compares the new settlers with the native Italians. It should be noted that the organization of mental health services in Italy strongly relies on outpatient services, while the psychiatric wards, within the general hospitals, usually accommodate patients in acute phases of their disorder. Nonetheless, migrants’ first contact often happens in a psychiatry ward when they are in a severe and acute psychopathological condition. Research methods: Quantitative and qualitative; longitudinal research using official statistical and clinical data obtained from records of a public hospital as well as information obtained through professional interview. Results: In relation to mental health, we found that the migrant patients referred for psychiatric consultation to the emergency department (ED) setting were younger, less frequently treated by psychiatric outpatient services, more commonly going to the ED for self‐injury and presenting with symptoms of substance abuse and alcohol‐related disorders. The native Italian population was older, more frequently retired and/or invalid, more frequently already treated by psychiatric outpatient services for any kind of psychiatric symptoms. Conclusion: The comparison of the sociodemographic and clinical features of immigrants and Italians referred for psychiatric consultation in the ED highlighted some differences. Implications are discussed in the light of the existing literature