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The numerical simulation of rocket engine thrust chambers is very challenging as several damaging phenomena, such as plasticity, low-cycle-fatigue (LCF) and creep occur during its service life. The possibility of simulating the thermostructural behavior of the engine, by means of non-linear finite element analyses, allows the engineers to guarantee the structural safety of the structure. This document reports the numerical simulations developed with the aim of predicting the thermostructural behaviour and the service life of the thrust chamber of a liquid-propellant rocket engine. The work represents a step ahead of previous researches by the authors, with particular reference to the addition of the Smith-Watson-Topper (SWT) fatigue criterion, and to the implementation of a sub-modelling technique, for a more accurate assessment of the most critical section of the component. It was found that the equivalent plastic strains in the most critical nodes obtained through the sub-modelling technique were about 20% lower than those calculated without sub-modelling. Consistently with experimental tests from literature conducted on similar geometries, the most critical areas resulted to be on the internal surface of the chamber. The analyses demonstrated that the LCF damaging contribution was significant, with a life prediction for the thrust chamber of about 3400 cycles. 相似文献
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Karen L Smith Rahul R Rao Clara Velázquez-Sánchez Marta Valenza Chiara Giuliano Barry J Everitt Valentina Sabino Pietro Cottone 《Neuropsychopharmacology》2015,40(5):1163-1171
Binge-eating disorder is characterized by excessive, uncontrollable consumption of palatable food within brief periods of time. The role of the glutamatergic N-methyl-D-aspartate (NMDA) receptor system in hedonic feeding is poorly understood. The aim of this study was to characterize the effects of the uncompetitive NMDA receptor antagonist memantine on palatable food-induced behavioral adaptations using a rat model, which mimics the characteristic symptomatology observed in binge-eating disorder. For this purpose, we allowed male Wistar rats to respond to obtain a highly palatable, sugary diet (Palatable group) or a regular chow diet (Chow control group), for 1 h a day, under a fixed-ratio 1 (FR1) schedule of reinforcement. Upon stabilization of food responding, we tested the effects of memantine on the Chow and Palatable food groups'' intake. Then, we tested the effects of memantine on food-seeking behavior, under a second-order schedule of reinforcement. Furthermore, we investigated the effects of memantine on the intake of food when it was offered in an aversive, bright compartment of a light/dark conflict test. Finally, we evaluated the effects of memantine on FR1 responding for food, when microinfused into the nucleus accumbens (NAcc) shell or core. Memantine dose-dependently decreased binge-like eating and fully blocked food-seeking behavior and compulsive eating, selectively in the Palatable food group. The drug treatment did not affect performance of the control Chow food group. Finally, intra-NAcc shell, but not core, microinfusion of memantine decreased binge-like eating. Together, these findings substantiate a role of memantine as a potential pharmacological treatment for binge-eating disorder. 相似文献
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Clinical benefits of non‐taxane chemotherapies in unselected patients with symptomatic metastatic castration‐resistant prostate cancer after docetaxel: the GETUG‐P02 study
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Florence Joly Remy Delva Loïc Mourey Emmanuel Sevin Emmanuelle Bompas Lionel Vedrine Alain Ravaud Jean‐Christophe Eymard Nicole Tubiana‐Mathieu Claude Linassier Nadine Houede Aline Guillot François Ringensen Oana Cojocarasu Bruno Valenza Alexandra Leconte Stéphanie Lheureux Bénédicte Clarisse Stéphane Oudard 《BJU international》2015,115(1):65-73
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Electronic health records (EHRs) are a major development in the practice of dentistry, and dental schools and dental curricula have benefitted from this technology. Patient data entry, storage, retrieval, transmission, and archiving have been streamlined, and the potential for teledentistry and improvement in epidemiological research is beginning to be realized. However, maintaining patient health information in an electronic form has also changed the environment in dental education, setting up potential ethical dilemmas for students and faculty members. The purpose of this article is to explore some of the ethical issues related to EHRs, the advantages and concerns related to the use of computers in the dental operatory, the impact of the EHR on the doctor-patient relationship, the introduction of web-based EHRs, the link between technology and ethics, and potential solutions for the management of ethical concerns related to EHRs in dental schools. 相似文献
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Marco Menchetti Cecilia Sighinolfi Vittorio Di Michele Paolo Peloso Claudia Nespeca Pier Venanzio Bandieri Maria Bologna Angelo Fioritti Roberta Fravega Lucio Ghio Simona Gotelli Paolo Levantesi Maria Amparo Ortega Micaela Savorani Luigi Simoni Ilaria Tarricone Mara Morini Linda Gask Domenico Berardi 《General hospital psychiatry》2013
Trial design
This was a multicenter cluster-randomized controlled trial.Participants
A total of 227 patients ≥ 18 years old with a new onset of depressive symptoms who screened positive on the first two items of the Patient Health Questionnaire-9 (PHQ-9) were recruited by primary care physicians (PCPs) of eight health districts of three Italian regions from September 2009 to June 2011.Intervention
PCPs of the intervention group received a specific collaborative care program including 2 days of intensive training, implementation of a stepped care protocol, depression management toolkit and scheduled meetings with a dedicated consultant psychiatrist.Objective
The objective was to determine whether a collaborative care program for depression management in primary care leads to higher remission rate than usual PCP care.Outcomes
Outcome was clinical remission as expressed on PHQ-9 < 5 at 3 months.Randomization
An independent researcher used computer-generated randomization to assign involved primary care groups to the two alternative arms.Blinding
PCPs and research personnel were not blinded.Results
The 223 PCPs enrolled recruited 227 patients (128 in collaborative care arm, 99 in the usual care arm). At 3 months (n= 210), the proportion of patients who achieved remission was higher, though the difference was not statistically significant, in the collaborative care group. The effect size was of 0.11. When considering only patients with minor/major depression, collaborative care appeared to be more effective than usual care (P= .015).Conclusions
The present intervention for managing depression in primary care, designed to be applicable to the Italian context, appears to be effective and feasible. 相似文献9.
I. Cabrera-Martos M. C. Valenza A. Benítez-Feliponi C. Robles-Vizcaíno A. Ruiz-Extremera G. Valenza-Demet 《Child's nervous system》2013,29(10):1893-1898
Purpose
The aim of this study was to evaluate the results of a conservative intervention in infants with plagiocephaly according to their specific clinical profile.Methods
Prospective clinical trial in which 104 infants with plagiocephaly accompanied or not by congenital or positional torticollis were referred to Early Care and Monitoring Unit (USAT) of San Cecilio Hospital in Granada, between 2009 and 2012. All the infants, grouped into three categories of severity, were included in the physiotherapy protocol until adequate craniofacial morphology and motor development were achieved. The study included an assessment of parents and infants. Parents were assessed with a questionnaire about the mother’s medical history and birth-related issues. The assessment of infants included anthropometric measures, a positional assessment, the observation of the head, the assessment of severity, and motor development.Results
Birth characteristics were similar in the total sample but showed different clinical profiles according to treatment aspects. More specifically, infants with severe plagiocephaly were referred to treatment later and spent more time in treatment; use of an orthotic helmet was also more prevalent in this category. There were also significant differences (P?<?0.05) in the acquisition of specific gross motor skills depending on the severity of plagiocephaly.Conclusion
The findings suggest that the physiotherapy protocol presented is effective to correct plagiocephaly. Severity of plagiocephaly is a marker that should be taken into account when designing actions aimed at improving gross motor skill development. 相似文献10.
Successful Transplantation of Lungs From an Uncontrolled Donor After Circulatory Death Preserved In Situ by Alveolar Recruitment Maneuvers and Assessed by Ex Vivo Lung Perfusion
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F. Valenza G. Citerio A. Palleschi A. Vargiolu B. Safaee Fakhr A. Confalonieri M. Nosotti S. Gatti S. Ravasi S. Vesconi A. Pesenti F. Blasi L. Santambrogio L. Gattinoni 《American journal of transplantation》2016,16(4):1312-1318
We developed a protocol to procure lungs from uncontrolled donors after circulatory determination of death (NCT02061462). Subjects with cardiovascular collapse, treated on scene by a resuscitation team and transferred to the emergency room, are considered potential donors once declared dead. Exclusion criteria include unwitnessed collapse, no‐flow period of >15 min and low flow >60 min. After death, lung preservation with recruitment maneuvers, continuous positive airway pressure, and protective mechanical ventilation is applied to the donor. After procurement, ex vivo lung perfusion (EVLP) is performed. From November 2014, 10 subjects were considered potential donors; one of these underwent the full process of procurement, EVLP, and transplantation. The donor was a 46‐year‐old male who died because of thoracic aortic dissection. Lungs were procured 4 h and 48 min after death, and deemed suitable for transplantation after EVLP. Lungs were then offered to a rapidly deteriorating recipient with cystic fibrosis (lung allocation score [LAS] 46) who consented to the transplant in this experimental setting. Six months after transplantation, the recipient is in good condition (forced expiratory volume in 1 s 85%) with no signs of rejection. This protocol allowed procurement of lungs from an uncontrolled donor after circulatory determination of death following an extended period of warm ischemia. 相似文献