Electric sail static structural analysis with finite element approach

The propulsive characteristics of an Electric Solar Wind Sail are usually evaluated using a simplified model in which all the sail tethers are coplanar and form a sort of rigid disk. However, the three-dimensional arrangement of the tethers is fundamental information in the study of the spacecraft performance, and must be accounted for in refined mission analyses. In this paper, a Finite Element approach is chosen to estimate the deflected shape of the tethers, thus allowing important information on the structural response of the sail to be obtained. A parametric code is developed to perform a static analysis of an Electric Solar Wind Sail, whose requirements are given in terms of payload mass and spacecraft characteristic acceleration. In particular, the tether structural response is investigated using three different beam models, which are compared in terms of accuracy and computational efficiency. The analysis is specialized to the noteworthy case of a Sun-facing sail that is placed at a distance of one astronomical unit from the Sun. The numerical results, which concern a set of possible sail configurations, are compared with those taken from analytical models

Laparoscopic Cholecystectomy in the Cirrhotic: Review of Literature on Indications and Technique

Cholelithiasis is twice more common in patients suffering from liver cirrhosis compared to overall population and in those patients, acute cholecystitis occurs significantly more often. Our goal was to review the literature and to overview the indications, contra-indications, and alternatives in the cirrhotic with biliary stones. We conducted a systematic review of the literature using the key words "Cirrhosis", "cholecystectomy", "laparoscopy"and "indications". Selected articles were reviewed for information specific to indications, contra-indications, and alternatives to laparoscopic cholecystectomy in cirrhotics. Results showed that laparoscopic cholecystectomy might offer several advantages in cirrhotic population, however cholecystectomy can be challenging: specific indications and alternatives to surgery must be discussed case by case. Laparoscopic cholecystectomy can be performed safely in selected patients with cirrhosis; special precautions are warranted regarding pneumoperitoneum pressure, trocar placement and increased safety with Indocyanine-green (ICG) fluorescence cholangiography. Nevertheless, in high-risk cirrhotic patients (Child C) and/or in common bile duct lithiasis endoscopic and non-surgical conservative treatments are preferable

Mass accretion rates of clusters of galaxies: CIRS and HeCS

We use a new spherical accretion recipe tested on N-body simulations to measure the observed mass accretion rate (MAR) of 129 clusters in the Cluster Infall Regions in the Sloan Digital Sky Survey (CIRS) and in the Hectospec Cluster Survey (HeCS). The observed clusters cover the redshift range of $0.01<z<0.30$ and the mass range of $\sim 10^{14}-10^{15} {h^{-1}~\rm{M_\odot}}$. Based on three-dimensional mass profiles of simulated clusters reaching beyond the virial radius, our recipe returns MARs that agree with MARs based on merger trees. We adopt this recipe to estimate the MAR of real clusters based on measurements of the mass profile out to $\sim 3R_{200}$. We use the caustic method to measure the mass profiles to these large radii. We demonstrate the validity of our estimates by applying the same approach to a set of mock redshift surveys of a sample of 2000 simulated clusters with a median mass of $M_{200}= 10^{14} {h^{-1}~\rm{M_{\odot}}}$ as well as a sample of 50 simulated clusters with a median mass of $M_{200}= 10^{15} {h^{-1}~\rm{M_{\odot}}}$: the median MARs based on the caustic mass profiles of the simulated clusters are unbiased and agree within $19\%$ with the median MARs based on the real mass profile of the clusters. The MAR of the CIRS and HeCS clusters increases with the mass and the redshift of the accreting cluster, which is in excellent agreement with the growth of clusters in the $\Lambda$CDM model.Comment: 25 pages, 19 figures, 7 table

Professional attitudes to sex offenders: implications for multiagency and collaborative working

Recent years have seen the development and implementation of a range of multi-disciplinary and partnership approaches to managing risk in known sex offenders, involving collaboration between justice and human services agencies. Potential barriers to the development of effective multidisciplinary practices arise when participating professionals hold different attitudes about those they are responsible for managing. This paper examines differences in attitudes towards sex offenders in two professional groups &ndash; police officers and allied health workers. The results suggest that police officers tend to hold more negative views than those who deliver treatment and support services. They are more likely to believe that offenders cannot change their behaviour and should be subject to more punitive sanctions. These findings are discussed in relation to judgements of both risk and dangerousness and associated decisions about the appropriate management of sex offenders in multi-agency and multi-disciplinary working forums

Phase II, Open-label, Single-arm, Multicenter Study to Assess the Activity and Safety of Alectinib as Neoadjuvant Treatment in Surgically Resectable Stage III ALK-positive NSCLC: ALNEO Trial

Background: Alectinib is a potent anaplastic lymphoma kinase (ALK)-tyrosine kinase inhibitor (TKI) which is currently used in the first-line setting of advanced ALK+ non-small cell lung cancer (NSCLC). Despite favorable results in the metastatic setting, the activity of alectinib in locally-advanced ALK+ NSCLC as a neoadjuvant treatment remains to be assessed. We report the case of a patient with stage IIIA ALK+ NSCLC (cT2aN2) who received alectinib as neoadjuvant treatment, achieving major pathological response (MPR) at pathologic examination. Hence we present the treatment rationale and study design of a phase II, open-label, single-arm, multicenter clinical trial (ALNEO study, EUDRACT number 2020-003432-25). Materials and Methods: Patients with potentially resectable stage III ALK+ NSCLC (any T with N2, T4N0-1) will be registered to receive oral alectinib 600 mg twice daily for 2 cycles of 4 weeks each (8 weeks totally) during the neoadjuvant phase. After definitive surgery, patients will enter in the adjuvant setting, during which they will receive alectinib 600 mg twice daily for 24 cycles (96 weeks). The primary endpoint is MPR, defined as ≤10% residual viable tumor cells histologically detected in the resected primary tumor and all resected lymph nodes after surgery. Secondary endpoints include pathological complete response, objective response, event-free survival, disease-free survival, overall survival, adverse events. Conclusions: Our case report supports the feasibility of alectinib as neoadjuvant treatment. ALNEO study will further explore the activity and safety of this novel treatment strategy