Finite element simulation of semi-finishing turning of Electron Beam Melted Ti6Al4V under dry and cryogenic cooling

open6noIn the last few years, important step forwards have been made on Finite Element Simulation of machining operations. Wrought Ti6Al4V alloy has been deeply investigated both numerically and experimentally due to its wide application in the industry. Recently, Additive Manufacturing technologies as the Electron Beam Melting and the Direct Melting Laser Sintering are more and more employed in the production of biomedical and aeronautical components made of Ti6Al4V alloy. Fine acicular microstructures are generated by the application of additive manufacturing technologies, affecting the mechanical properties and the machinability. By the consequence, this peculiarity has to be considered in modelling the material behaviour. In this work, a numerical analysis of cylindrical external turning on Electron Beam Melted (EBM) Ti6Al4V alloy is presented. A Johnson-Cook constitutive equation was implemented as a flow stress model and adapted with respect to the wrought Ti6Al4V alloy. The model was calibrated and validated through the cutting forces and temperatures measurements acquired under dry and cryogenic lubricating conditions.openBordin, A; Imbrogno, S.; Rotella, G.; Bruschi, S.; Ghiotti, A.; Umbrello, D.Bordin, Alberto; Imbrogno, S.; Rotella, G.; Bruschi, Stefania; Ghiotti, Andrea; Umbrello, D

Exposição à violência entre jovens da cidade de São Paulo em privação de liberdade

OBJECTIVE: This study aimed to determine the extent of exposure to community violence among delinquent Brazilian youth in the 12-month period prior to their incarceration and to identify factors associated with this exposure. METHOD: With an oversampling of girls, a cross-section of youth under 18 years of age from juvenile detention units in the city of São Paulo, Brazil completed a structured interview. Key items related to exposure to violence (witnessed and experienced) were drawn from the Social and Health Assessment questionnaire to cover the 12-month period prior to incarceration. RESULTS: Participants (n = 325, 89% boys) reported high rates of exposure to violence with largely similar levels for boys and girls. Being threatened with physical harm, being beaten or mugged and/ or shot at were the most common forms of violence experienced. After controlling for demographic and family variables, the fact of having peers involved in risk behavior, easy access to guns and previous involvement with the justice system were associated with witnessed violence; whereas having slept on the street was the only variable associated with experienced violence. CONCLUSION: This group of youth was exposed to high levels of violence and other adverse experiences. Future research should examine the effectiveness of strategies aimed at reducing the exposure to violence of high-risk youth.OBJETIVO: Esse estudo procurou determinar a extensão da exposição à violência na comunidade entre jovens brasileiros delinquentes nos 12 meses que antecederam sua privação de liberdade e identificar fatores associados a essa exposição. MÉTODO: Um corte transversal de menores de 18 anos internados em unidades da Fundação Casa/ex-FEBEM na cidade de São Paulo, Brasil (com meninas superamostradas) participou de entrevista estruturada. Itens-chave sobre exposição à violência (testemunhada e vivenciada) foram retirados do questionário Social and Health Assessment para cobrir o período de 12 meses anterior à internação. RESULTADOS: Os participantes (n = 325, 89% meninos) referiram altas taxas de exposição à violência, taxas estas muito similares entre meninos e meninas. Ter sofrido ameaças de lesão física, ter sido espancado ou assaltado e/ou baleado foram as formas mais comuns de violência vivenciada. Após controlar por fatores sociodemográficos e familiares, o relacionamento com jovens envolvidos em comportamentos de risco, o fácil acesso a armas de fogo e a passagem prévia pela Justiça estiveram associados à violência testemunhada, enquanto ter dormido na rua foi o único fator associado à violência vivenciada. CONCLUSÃO: Esse grupo de jovens foi exposto a altos níveis de violência e a outras experiências adversas. Pesquisas futuras devem examinar a efetividade de estratégias que visem reduzir a exposição à violência entre jovens de alto risco.University of Calgary Faculty of Medicine Department of Community Health SciencesUniversity of Calgary Faculty of Medicine Departments of Community Health Sciences, Psychiatry and PediatricsUniversidade Federal de São Paulo (UNIFESP) Departamento de PsiquiatriaUNIFESP, Depto. de PsiquiatriaSciEL

TrajPy: empowering feature engineering for trajectory analysis across domains

Trajectories, sequentially measured quantities that form a path, are an important presence in many different fields, from hadronic beams in physics to electrocardiograms in medicine. Trajectory anal-ysis requires the quantification and classification of curves either using statistical descriptors or physics-based features. To date, there is no extensive and user-friendly package for trajectory anal-ysis available, despite its importance and potential application across domains. We developed a free open-source python package named TrajPy as a complementary tool to empower trajectory analysis. The package showcases a friendly graphic user interface and provides a set of physical descriptors that help characterizing these intricate structures. In combina-tion with image analysis, it was already successfully applied to the study of mitochondrial motility in neuroblastoma cell lines and to the analysis of in silico models for cell migration. The TrajPy package was developed in Python 3 and released under the GNU GPL-3 license. Easy installation is available through PyPi and the development source code can be found in the repository https://github.com/ocbe-uio/TrajPy/. The package release is automatically archived under the DOI 10.5281/zenodo.3656044.Comment: 4 pages, 1 figur

Does traumatic occlusal forces lead to peri-implant bone loss? a systematic review

Observational studies have indicated that crestal bone level changes at implants are typically associated with clinical signs of inflammation, but still mechanical overload has been described as possible factor leading to hard-tissue deficiencies at implant sites without mucosal inflammation. The aim of this paper was systematically review the literature regarding the possible effect of traumatic occlusal forces on the peri-implant bone levels. Literature search was conducted using PubMed, Scielo and Lilacs, including the following terms: oral OR dental AND implant$AND (load OR overload OR excessive load OR force$ OR bruxism) AND (bone loss OR bone resorption OR implant failure$). Databases were searched for the past 10 years of publications, including: clinical human studies, either randomized or not, cohort studies, case control studies, case series and animal research. Exclusion criteria were review articles, guidelines and in vitro and in silico (finite element analysis) research, as well as retrospective studies. The PICO questions formulated was: "does traumatic occlusal forces lead to peri-implant bone loss?" The database searches as well as additional hand searching, resulted in 807 potentially relevant titles. After inclusion/exclusion criteria assessment 2 clinical and 4 animal studies were considered relevant to the topic. The included animal studies did not reveal an association between overload and peri-implant bone loss when lower overloads were applied, whereas in the presence of excessive overload it seemed to generate peri-implant bone loss, even in the absence of inflammation. The effect of traumatic occlusal forces in peri-implant bone loss is poorly reported and provides little evidence to support a cause-and-effect relationship in humans, considering the strength of a clinically relevant traumatic occlusal force33

Interactional positioning and narrative self-construction in the first session of psychodynamic-interpersonal psychotherapy

The purpose of this study is to identify possible session one indicators of end of treatment psychotherapy outcome using the framework of three types of interactional positioning; client’s self-positioning, client’s positioning between narrated self and different partners, and the positioning between client and therapist. Three successful cases of 8-session psychodynamic-interpersonal (PI) therapy were selected on the basis of client Beck Depression Inventory scores. One unsuccessful case was also selected against which identified patterns could be tested. The successful clients were more descriptive about their problems and demonstrated active rapport-building, while the therapist used positionings expressed by the client in order to explore the positionings developed between them during therapy. The unsuccessful case was characterized by lack of positive self-comment, minimization of agentic self-capacity, and empathy-disrupting narrative confusions. We conclude that the theory of interactional positioning has been useful in identifying patterns worth exploring as early indicators of success in PI therapy

Human neutrophil alloantigens systems

Neutrophil alloantigens are involved in a variety of clinical conditions including immune neutropenias, transfusion-related acute lung injury (TRALI), refractoriness to granulocyte transfusions and febrile transfusion reactions. In the last decade, considerable progress has been made in the characterization of the implicated antigens. Currently, seven antigens are assigned to five human neutrophil antigen (HNA) systems. The HNA-1a, HNA-1b and HNA-1c antigens have been identified as polymorphic forms of the neutrophil Fcγ receptor IIIb (CD16b), encoded by three alleles. Recently, the primary structure of the HNA-2a antigen was elucidated and the HNA-2a-bearing glycoprotein was identified as a member of the Ly-6/uPAR superfamily, which has been clustered as CD177. The HNA-3a antigen is located on a 70-95 kDa glycoprotein; however, its molecular basis is still unknown. Finally, the HNA-4a and HNA-5a antigens were found to be caused by single nucleotide mutations in the αM (CD11b) and αL (CD11a) subunits of the leucocyte adhesion molecules (β2 integrins). Molecular and biochemical characterization of neutrophil antigenshave expanded our diagnostic tools by the introduction of genotyping techniques and immunoassays for antibody identification. Further studies in the field of neutrophil immunology will facilitate the prevention and management of transfusion reactions and immune diseases caused by neutrophil antibodies.Os aloantígenos de neutrófilos estão associados a várias condições clínicas como neutropenias imunes, insuficiência pulmonar relacionada à transfusão (TRALI), refratariedade à transfusão de granulócitos, e reações transfusionais febris. Na última década, foi observado considerável progresso na caracterização dos aloantígenos envolvidos nestas condições clínicas. Atualmente sete antígenos estão incluídos em cinco sistemas de antígenos de neutrófilo humano (HNA). Os antígenos HNA-1a, HNA-1b e HNA-1c foram identificados como formas polimórficas do receptor Fcγ RIIIb (CD16b), codificados por três alelos. Recentemente, a estrutura primária do antígeno HNA-2a foi elucidada e a glicoproteína carreadora do antígeno foi identificada como um membro da superfamília Ly-6/uPARe designada como CD177. O antígeno HNA-3a está localizadoem uma glicoproteína de 70-90 kDa, entretanto sua base molecular ainda é desconhecida. Finalmente, os antígenos HNA-4ae HNA-5a são resultantes de mutações de um único nucleotídeo nas subunidades αM (CD11b) and αL (CD11a) das moléculas de adesão de leucócitos (β2 integrinas). A caracterização molecular e bioquímica dos antígenos neutrofílicos permitiu a expansão das ferramentas diagnósticas pela introdução de técnicas de genotipagem e imunoensaios para a identificação de anticorpos. Novos estudos envolvendo a imunologia de granulócitos serão de grande valor para a prevenção e tratamento de reações transfusionais e doenças imunes causadas por aloanticorpos de neutrófilos.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Universidade Federal de São Paulo (UNIFESP)UNIFESPSciEL

Advantages of alginate and PPI combination in relief of heartburn and regurgitation during the first days of treatment of gastroesophageal reflux disease

Aim of investigation. To estimate advantages of combined intake of proton pump inhibitor (PPI) and alginate in comparison to monotherapy by PPI in terms of symptom relief in the first days of gastroesophageal reflux disease (GERD) treatment.Material and methods. Overall 96 patients with GERD were investigated. All patients complained of heartburn, 41 patients had regurgitation. Symptoms were estimated by Likert scale prior to onset of therapy and daily during treatment course. General well-being was evaluated by visual-analog scale (VAS) prior to therapy, at the 7th and 14th days of treatment. The first group (46 patients, 19 males, mean age — 50,2±12,7 years) received combined therapy by pantoprazole 40 mg/day and alginate (Gaviscon DD) 20 ml qid at the 1st and 2nd days of treatment followed by «on demand» mode. The second group (50 patients, 22 males, mean age 51,3±14,4 year) received pantoprazole 40 mg per day. All patients underwent esophagogastroduodenoscopy.Results. At the 1st day of treatment heartburn has been completely relived in 61% of patients of the first group and in 14% — of the second (р<0,001), at the 2nd day — in 63% and 20% (р<0,001). At the 3rd day (alginate in «on demand» mode) the heartburn was absent in 48% of patients of the first group and in 44% — of the second (р=0,8). Regurgitation at the 1st day of treatment was relieved in 78% of patients of the first group and remained in all patients of the second group, who initially complained of it (р<0,001), at the 2nd day it stopped in 83% and 22% of patients respectively (р<0,001), at the 3rd day — in 67% and 22% (р=0,01). After the 4th day there were no intergroup differences. At the 7th day of treatment according to VAS wellbeing score in the first group increased from 57,3±9,7 to 78,1±11,2 mm (р <0,001), in the second — from 54,9±14,9 to 67,0±15,2 mm (р<0,001). The intergroup differences of the score at the 7th day was statistically significant (р<0,001). By the 14th day difference disappeared (78,8±9,7 mm vs 75,6±12,5 mm, р=0,1).Conclusions. This study has demonstrated advantages of the combined therapy in the first days of GERD treatment in decreased terms relief of symptoms and improvement of state of health

Crossed Andreev reflection and elastic co-tunneling in a three-site Kitaev chain nanowire device

The formation of a topological superconducting phase in a quantum-dot-based Kitaev chain requires nearest neighbor crossed Andreev reflection and elastic co-tunneling. Here we report on a hybrid InSb nanowire in a three-site Kitaev chain geometry - the smallest system with well-defined bulk and edge - where two superconductor-semiconductor hybrids separate three quantum dots. We demonstrate pairwise crossed Andreev reflection and elastic co-tunneling between both pairs of neighboring dots and show sequential tunneling processes involving all three quantum dots. These results are the next step towards the realization of topological superconductivity in long Kitaev chain devices with many coupled quantum dots