Ultra wide band receiver based on turbo-equalization

La technologie de l'Ultra-Large-bande (UWB) est actuellement étudiée comme une solution utile pour les systèmes de communications sans fil de grande capacité. Le rapport élevé de la largeur de bande du signal à la largeur de bande de l'information rend la technologie d'UWB attrayante pour des applications d'accès multiple. La synchronisation et l'égalization du canal sont les questions cruciales dans le développement de la technologie d'UWB, dû à la courte durée des signaux transmises. Dans cette contribution, nous proposons un turbo-égaliseur pour des récepteurs d'UWB, afin d'améliorer l'exécution de l'approche conventionnelle (récepteur RAKE). En particulier, les résultats obtenus ont démontré un perfectionnement d'exécution, en termes de taux d'erreurs sur les bits, avec une complexité computationelle menable

Towards 3D synthetic aperture radar echography

One of the problems associated with electromagnetic imaging is that the interaction of photons with targets occurs only on part of their surface, namely those exposed to the transmitted energy rays. Imaging of deep localized objects is very hard especially in the presence of short electromgnetic wavelengths. In this paper we propose a new method for through wall imaging, based on photons and sound waves analysis. The technique investigates Doppler analysis in terms of estimating vibrations generated on infrastructures. The proposed method estimates target's vibration energy in order to perform tomographic imaging of man-made objects, such as buildings. Unlike traditional imaging, this technique allows for through wall imaging. The experimental results are distributed over one case study, where we show the to-mographic imaging of a reinforced concrete infrastructure. We consider this preliminary work very promising for future applications performed from the processing of satellite synthetic aperture radar images

Views of Schizophrenia Among Future Healthcare Professionals: Differences in Relation to Diagnostic Labelling, Causal Explanations, and Type of Academic Degree Program

Objective: Stereotyped beliefs about schizophrenia are well-established in the society and relatively common among healthcare professionals and students. The aim of this study was to investigate the opinions about the causes, treatment, and outcome of schizophrenia among healthcare students. Method: Undergraduate nursing and psychology students completed selected items of the Opinion on Mental Illness Questionnaire after reading a clinical vignette of undiagnosed schizophrenia. Results: Students who labelled the description as schizophrenia were more pessimistic regarding full recovery from the disorder. Those who acknowledged greater relevance to biogenetic risk factors were more convinced of the efficacy of medications. Respondents’ opinions on the efficacy of psychological interventions were more positive among psychology students than among nursing students. Conclusions: The study confirmed the associations of schizophrenia labelling with prognostic pessimism and beliefs about the efficacy of pharmacological treatment among future healthcare professionals. Students’ opinions were less influenced by differences between academic degree programs. Information about current recovery rate and comprehensive care for schizophrenia may support future healthcare professionals in the relationship and the clinical management of PWS

Perceived public stigma towards schizophrenia among healthcare students: The relationship with diagnostic labelling and contact with people with schizophrenia

Objectives This study aimed at investigating the relationship between perceived public stigma towards people with schizophrenia (PWS) and their family members in a large sample of medical and psychology students. We hypothesised that: a) schizophrenia labelling would be related to greater perceived public stigma; b) contact with PWS would be related with lower perceived stigma; c) perceived public stigma would be similar between medical and psychology students and would be higher among students attending the clinical stage compared to their pre-clinical colleagues. Methods Participants were 592 students attending either the pre-clinical or clinical stage of coursework in Medicine and Psychology, at the University of Palermo (Italy) (Tab. I). Study measures included a short socio-demographic questionnaire, the Devaluation of Consumers Scale (DCS), and the Devaluation Consumers Families Scale (DCFS). Results Students who identified schizophrenia in an unlabelled clinical description expressed greater perceived public stigma towards PWS (t = -2.895, p = 0.004) and their family members (t = -2.389, p = 0.017). A trend-level association was found between previous contact with PWS and lower perceived public stigma (t = 1.903, p = 0.058), which became significant for those students who had a more extensive contact (Mann-Whitney z = 2.063, p = 0.039). Compared to medical students, psychology students perceived greater public stigma towards PWS. No difference was observed between students at different stages of their academic coursework (Tab. II). In a multivariate linear regression model, schizophrenia labelling and degree course predicted perceived public stigma towards severe mental disorders. Conclusions This study replicated previous findings on the relationship between public stigma towards PWS, schizophrenia labelling, and contact with PWS. Perception of public stigma was similar among pre-clinical and clinical students and greater among psychology students. The findings suggest the importance of promoting a critical awareness of negative stereotypes towards schizophrenia among healthcare students, since the beginning of their coursework. In addition to correct information about schizophrenia, anti-stigma intervention should include contact with PWS who live in the community

Pathological gambling in adolescence: A narrative review

Pathological gambling is an emerging and increasing phenomenon in Western counties. This work is aimed at reviewing the existing literature on this topic, paying special attention to its development, course and outcome in adolescence. We will explore epidemiological data, the instruments for the diagnostic and clinical assessment, the course and the outcome of the disorder, the comorbidity with other psychiatric syndromes and disorders. The main risk factors will be described at individual, social and community level. We provide an overview of the available pharmacological and psychological treatments and we report a clinical vignette in order to describe the psychological and psychopathological features of pathological gambling in adolescence

The Palermo (Sicily) seismic cluster of September 2002, in the seismotectonic framework of the Tyrrhenian Sea-Sicily border area

The northern coast of Sicily and its offshore area represent a hinge zone between a sector of the Tyrrhenian Basin, characterized by the strongest crustal thinning, and the sector of the Sicilian belt which has emerged. This hinge zone is part of a wider W-E trending right-lateral shear zone, which has been affecting the Maghrebian Chain units since the Pliocene. Seismological and structural data have been used to evaluate the seismotectonic behavior of the area investigated here. Seismological analysis was performed on a data set of about 2100 seismic events which occurred between January 1988 and October 2002 in the Southern Tyrrhenian Sea. This paper focuses in particular on a set of data relating to the period from 6th September 2002, including both the main shock and about 540 aftershocks of the Palermo seismic sequence. The distribution of the hypocenters revealed the presence of two main seismogenic zones. The events of the easternmost zone may be related to the Ionian lithospheric slab diving beneath the Calabrian Arc. The seismicity associated with the westernmost zone is closely clustered around a sub-horizontal regression plane contained within the thinned Southern Tyrrhenian crust, hence suggesting that this seismogenic zone is strictly connected to the deformation field active within the hinge zone. On the basis of both structural and seismological data, the brittle deformation pattern is characterized by high-angle faults, mainly represented by transcurrent synthetic right-lateral and antithetic left-lateral systems, producing both restraining/uplifting and releasing/subsiding zones which accommodate strains developing in response to the current stress field (characterized by a maximum axis trending NW-SE) which has been active in the area since the Pliocene. The cluster of the seismic sequence which started with the 6th September 2002's main shock is located within the hinge zone. The distribution of the hypocenters relative to this sequence emphasizes the presence of a high-angle NE-SW-oriented deformation belt within which several shear surfaces are considered to be found sub-parallel to that established for the main shock. The kinematics of all these structures is consistent with a compressive right-lateral focal mechanism

A Pig Model of Hemivascular Liver Occlusion for The Study of Ischemia-Reperfusion Injury: Use of an Infrared System for Detecting Ischemic Areas

Aim: Different animals are used as experimental models for the hepatic Ischemia- Reperfusion (IR) injury investigations and for each one of these animal models, many different surgical approaches have been performed. The aim of our study was to establish a new surgical pig model in which a hemi-liver is used to study the pathophysiology of hepatic IR injury. Contro-lateral hemi- liver is used as an internal control in the same animal. Methods: Liver ischemia was performed in six pigs by clamping the hepatic artery and vein and the portal vein to isolate the left hepatic lobe. Four hours of warm ischemia were followed by 4-hourrs of reperfusion. Biochemical and hematological analyses were performed throughout the experiments. Needle biopsies were obtained prior to ischemia and then hourly during the reperfusion for evaluation of tissue damage. To assess local temperature gradients on the liver surface a focal plane array detector camera was used. Results: Four hours ischemia induced mild signs of hepatic damage on the left ischemic lobe while more dramatic changes were evidenced after 2-hours reperfusion. Absence of tissue damage was detected on the right lobe. The liver functional test reached their maximum value at 2-4 hours after reperfusion. Conclusion: Our model is easy to perform, feasible and reproducible. This surgical model minimizes biases dependent on the individual response of different animals under the same conditions. In this IR model the new technology of an infrared thermocamera was used to control temperature changes and provide clinically important real-time information during surgery

Azathioprine for prevention of clinical recurrence in Crohn's disease patients with severe endoscopic recurrence: an IG-IBD randomized double-blind trial

The recurrence of Crohn's Disease after ileo-colonic resection is a crucial issue. Severe endoscopic lesions increase the risk of developing early symptoms. Prevention and treatment of post-operative Endoscopic Recurrence (ER) have been studied with conflicting results. We compare effi cacy of azathioprine (AZA) vs. high-dose 5-aminosalicylic acid (5-ASA) in preventing clinical recurrence and treating severe post-operative ER

Vulnerability to low-dose combination of irinotecan and niraparib in ATM-mutated colorectal cancer

Background: Despite the advancements in new therapies for colorectal cancer (CRC), chemotherapy still constitutes the mainstay of the medical treatment. For this reason, new strategies to increase the efficacy of chemotherapy are desirable. Poly-ADP-Ribose Polymerase inhibitors (PARPi) have shown to increase the activity of DNA damaging chemotherapeutics used in the treatment of CRC, however previous clinical trials failed to validate these results and pointed out dose-limiting toxicities that hamper the use of such combinations in unselected CRC patients. Nevertheless, in these studies little attention was paid to the mutational status of homologous recombination repair (HRR) genes. Methods: We tested the combination of the PARPi niraparib with either 5-fluorouracil, oxaliplatin or irinotecan (SN38) in a panel of 12 molecularly annotated CRC cell lines, encompassing the 4 consensus molecular subtypes (CMSs). Synergism was calculated using the Chou-Talalay method for drug interaction. A correlation between synergism and genetic alterations in genes involved in homologous recombination (HR) repair was performed. We used clonogenic assays, mice xenograft models and patient-derived 3D spheroids to validate the results. The induction of DNA damage was studied by immunofluorescence. Results: We showed that human CRC cell lines, as well as patient-derived 3D spheroids, harboring pathogenic ATM mutations are significantly vulnerable to PARPi/chemotherapy combination at low doses, regardless of consensus molecular subtypes (CMS) and microsatellite status. The strongest synergism was shown for the combination of niraparib with irinotecan, and the presence of ATM mutations was associated to a delay in the resolution of double strand breaks (DSBs) through HRR and DNA damage persistence. Conclusions: This work demonstrates that a numerically relevant subset of CRCs carrying heterozygous ATM mutations may benefit from the combination treatment with low doses of niraparib and irinotecan, suggesting a new potential approach in the treatment of ATM-mutated CRC, that deserves to be prospectively validated in clinical trials

Four-dimensional distribution of the 2010 Eyjafjallajökull volcanic cloud over Europe observed by EARLINET

© Author(s) 2013. This work is distributed under the Creative Commons Attribution 3.0 License.The eruption of the Icelandic volcano Eyjafjallaj ökull in April-May 2010 represents a "natural experiment" to study the impact of volcanic emissions on a continental scale. For the first time, quantitative data about the presence, altitude, and layering of the volcanic cloud, in conjunction with optical information, are available for most parts of Europe derived from the observations by the European Aerosol Research Lidar NETwork (EARLINET). Based on multi-wavelength Raman lidar systems, EARLINET is the only instrument worldwide that is able to provide dense time series of high-quality optical data to be used for aerosol typing and for the retrieval of particle microphysical properties as a function of altitude. In this work we show the four-dimensional (4-D) distribution of the Eyjafjallajökull volcanic cloud in the troposphere over Europe as observed by EARLINET during the entire volcanic event (15 April-26 May 2010). All optical properties directly measured (backscatter, extinction, and particle linear depolarization ratio) are stored in the EARLINET database available at www.earlinet.org. A specific relational database providing the volcanic mask over Europe, realized ad hoc for this specific event, has been developed and is available on request at www.earlinet.org. During the first days after the eruption, volcanic particles were detected over Central Europe within a wide range of altitudes, from the upper troposphere down to the local planetary boundary layer (PBL). After 19 April 2010, volcanic particles were detected over southern and south-eastern Europe. During the first half of May (5-15 May), material emitted by the Eyjafjallajökull volcano was detected over Spain and Portugal and then over the Mediterranean and the Balkans. The last observations of the event were recorded until 25 May in Central Europe and in the Eastern Mediterranean area. The 4-D distribution of volcanic aerosol layering and optical properties on European scale reported here provides an unprecedented data set for evaluating satellite data and aerosol dispersion models for this kind of volcanic events.Peer reviewe