Objectives: The aim of this study was to examine beam hardening artefacts the NewTom® 9000 cone-beam computed tomography (CBCT) device compared with Philips MX 8000 (4-row multidetector CT (MDCT)). Methods: We modified a SawBone® skull become standardized model for our study. used scans CBCT and standard dental multi-detector (MDCT) at comparable reconstruction resolution Straumann ITI 4.1 mm implant in four positions maxilla (first permanent premolar right region, second molar first left...

Abstract Background Simulation-based training courses in laparoscopy have become a fundamental part of surgical programs. Surgical skills are challenging to master, and these induces stress responses trainees. There is limited data on trainees’ levels, the related different laparoscopic simulators, how previous experiences influence response during course. This study investigates physiologic, endocrine self-reported simulation-based course setting. Methods We conducted prospective...

Abstract A supportive school climate helps schoolchildren’s psychological adjustment, but it is relatively unknown about the processes that make these effects last over time. The present study aimed to examine mediating role of resilience in on adjustment at within-person level. participants were a total 1,052 primary children ( M ChildrenAgeT1 = 8.19, SD 1.76; 50% girls) from Spain, Poland, and Norway. Parents (87% mothers) reported variables four waves. School positively predicted...

Machine learning and deep are novel methods which revolutionizing medical imaging. In our study we trained an algorithm with a U-Net shaped network to recognize ultrasound images of the median nerve in complete distal half forearm measure cross-sectional area at inlet carpal tunnel. Images 25 patient hands tunnel syndrome (CTS) 26 healthy controls were recorded on video loop covering 15 cm 2355 manually segmented. We found average Dice score 0.76 between manual automated segmentation its...

We investigated changes in primary schoolchildren's perceptions of the school climate amidst COVID-19 pandemic and online learning shift. Data from Modified-Delaware School Climate Survey-Student collected before (Time 1 (T1): October/November 2019) during pandemic's initial wave 2 (T2): 12 months later) Spain, Norway Poland were analysed. In this repeat cross-sectional pre-post quasi-experimental study, we included a total 1167 participants at T1 1209 T2, ranging age 8 to 16 years...

A novel acoustic coupling fluid (ACF), with the potential to reduce surgically induced image artefacts during intraoperative ultrasound imaging in brain tumour surgery, has been evaluated respect quality and safety a clinical phase 1 study. Fifteen patients glioblastoma (WHO grade IV) were included. All adverse events registered 6-month study period. During acquisition of 3D volumes, three different concentrations ACF Ringer’s solution filled into resection cavity. The effect on images was...

Extracorporeal shock wave lithotripsy (ESWL) of kidney stones is losing ground to more expensive and invasive endoscopic treatments.This proof-of-concept project was initiated develop artificial intelligence (AI)-augmented ESWL investigate the potential for machine learning improve efficacy ESWL.Two-dimensional ultrasound videos were captured during treatments from an inline device with a video grabber. An observer annotated 23 212 images 11 patients as either in or out focus. The median hit...

Oil filled transformer explosions and their prevention are a complex industrial issue. Experimental tests showed that when an electrical fault occurs in transformer, it generates dynamic pressure waves propagate the oil. Reflections of these on walls build up high static which tanks can not withstand. Besides, numerical tool was developed to simulate phenomena highlighted during mainly wave propagation. It is based compressible two-phase flow modelling where viscous flow, electromagnetic,...

Transformer explosions are caused by electrical arcs occurring in the insulating oil. They generate dynamic pressure waves that propagate tank and interact with its structure leading to explosion. This whole process was studied using experiments performed on large scale transformers. Moreover, accurately study phenomena exhibited during this experimental campaign order minimize costs risks of testing, a computational tool developed simulate transformer An unsteady compressible 2-phase flow...

Background and Objectives:Laparoscopic treatment of incisional hernias reduces surgical traumas postoperative pain. It requires intraperitoneal placement a foreign body that might cause adhesions, leading to complications. The aim this study was improve reliability ultrasound in quantitatively estimating adhesions exploit the other advantages ultrasound, such as availability versatility.Methods:The examination performed by using hand-held 3.5MHz curved linear probe. image data were analyzed...

Electricity markets are very competitive and in order to limit costs, companies often reduce their investments by using aging equipment overloading transformers. For these reasons, oil-filled transformer explosions becoming more frequent. They caused electrical arcs occurring tanks. Within milliseconds, vaporize the surrounding oil generated gas is pressurized because liquid inertia prevents its expansion. The pressure difference between bubble generates a dynamic peak, which propagates...

Oil-filled transformer explosions are caused by low impedance faults that result in arcing tanks once the oil loses its dielectric properties These arcs generate dynamic pressure waves which interact with structure walls as they propagate throughout transformer, raising static and ultimately resulting tank ruptures possible fire. A simulation tool has been developed not only to study events, but also develop optimize an explosion prevention technique. The technique involves rapid evacuation...

Abstract The behaviour of a particle bed subjected to viscous flow upstream weir is experimentally examined. Experiments were conducted in rectangular flume which oil circulated above solid particles. Within about 150 mm the weir, underwent significant change and took shape dune. temporal evolutions dune position size determined for various discharges heights. At steady state, both parameters independent discharge but affected by height. Results indicate that axial crest varies linearly with...

Transformer explosion and its prevention is a complex industrial issue where various physical phenomena occur. To understand them, an experimental test campaign was performed by CEPEL on large scale transformers. It consisted in creating arcing oil filled transformer tanks. The tests confirmed that the arc generates dynamic pressure waves propagate oil. Reflections of these walls build up high static to which tanks can not withstand. This increase be prevented quick evacuation triggered...