52 research outputs found
The Journey from Australia to Italy of Alice Pung’s Bestselling Novel
No full textAlice Pung's Unpolished Gem was translated into Italian in 2010. Giving some examples of the challenge this work of translation presented, Adele D'Arcangelo will try to put Pung's novel in the picture of a wider production of multicultural literature available in Italy. Positive aspects related to the reception of Gemma Impura in Italy will be pointed out as well as the vital and fundamental collaboration between author and translator. The innate potentialities of Unpolished Gem to transform a personal experience in a universal one were doubled by the translation of the book in another language, allowing a wider and more eclectic readership to become familiar with Alice's story, and making its Australian setting overcome the boundaries of language and spac
Laser weldability of laser powder bed fused AlSi7Mg0.6
No full textLaser Powder Bed Fusion (LPBF) allows to manufacture components with lightweight and near net shape suited to aerospace and aviation applications employing Al-alloys. The process is highly suited to one-of-a-kind or small batch production of small to medium sized parts. As the maturity of the process and its end-users increase, the demand for larger components becomes more relevant. The increase of part size by increasing the size of the LPBF machine inevitably increases the cost and the complexity of the employed system. Moreover, using multiple lasers in a large powder bed to produce larger parts may bring residual stresses, part deformation and a higher chance of process failure. In the light of these, the use of joining operations, in particular welding, appears as a suitable option for the production of large components via LPBF. Indeed, the process lends itself well to also producing dedicated joint edge preparations, thickness and section variation within the location of the welded joint. Amongst different processes, laser welding stands out as a viable option as it can provide narrower weld seam and heat affected zone, produce less deformation on the parts and be automated with cartesian or robotic manipulators. This work discusses the influence of different laser welding strategies on the LPBF produced AlSi7Mg0.6
Progress and prospects of the FTU collective thomson scattering diagnostics
No full textDuring the last years anomalous signals have been found in the spectra analyzed with the Collective Thomson Scattering (CTS) diagnostics in tokamak devices like TEXTOR, ASDEX and FTU. The signal frequency, down-shifted with respect to the probing one, suggested the explanation of their origin in terms of Parametric Decay Instability (PDI) processes correlated with the presence of magnetic islands and taking place even for values of the pumping wave power below the threshold predicted by conventionalmodels. A threshold lower or comparable with the power levels routinely used could pose limitations to the use of the ECRH in fusion devices. An accurate characterization of the conditions for the occurrence of this phenomenon and of its consequences is thus of primary importance. The CTS diagnostics of FTU has been recently improved for this aim with a new fast data acquisition, allowing spectra reconstruction by direct FFT of the intermediate frequency signal, added in parallel to the pre-existing multichannel spectrum analyzer. A section with polarizing mirrors has been introduced in the quasi-optical transmission line to control the polarization of the received signals. Exploiting the front-steering configuration available with the real-Time launcher of FTU, the setup allows studying the anomalous emissions in conditions of density and wave injection similar to ITER. Given the possibility of the CTS in FTU to operate in both O-and X-mode, a second radiometer is being installed, to detect simultaneously signals scattered in both polarizations. The upgrades mentioned above are presented in this work as well as the first data obtained in 2014, during the experimental activity carried out under an EUROfusion Enabling Research project. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence
Translating History or Romance? Historical Romantic Fiction and Its Translation in a Globalised Market
No full textPopular romance literature has long been neglected and underestimated in the global literary context and little research on the translation of this genre has been carried out so far. Even taking into account its “popular connotation”, romantic fiction seems to occupy the lower shelf in the literary polysystem compared with other popular genres. The discrepancy between the importance of this genre in the publishing industry and the scarce attention given to it by traditional scholars means that little is known about the textual practices and processes that accompany its production and circulation, including translation. In this paper, we deal with the issue of translating romantic fiction, focusing on the specific translation of historical romances, one of its most popular subgenres. In particular, through the analysis of a specific case study, the novel Outlander by American author Diana Gabaldon, we suggest that the double filiation of historical romances, i.e. their connection to both popular and canonical traditions, may have consequences at the textual level as when such books are translated, their ambiguous generic labelling tends to be resolved, favouring either the romantic or the historical component, thus resulting in a stronger generic identity
Unpolished Gem/Gemma impura the Journey from Australia to Italy of Alice Pung’s Bestselling Novel
No full textAlice Pung's Unpolished Gem was translated into Italian in 2010. Giving some examples of the challenge this work of translation presented, Adele D'Arcangelo will try to put Pung's novel in the picture of a wider production of multicultural literature available in Italy. Positive aspects related to the reception of Gemma Impura in Italy will be pointed out as well as the vital and fundamental collaboration between author and translator. The innate potentialities of Unpolished Gem to transform a personal experience in a universal one were doubled by the translation of the book in another language, allowing a wider and more eclectic readership to become familiar with Alice's story, and making its Australian setting overcome the boundaries of language and spac
High speed videography of gap bridging with beam oscillation and wire feeding during the laser welding of stainless steel and aluminum alloys
No full textLaser beam welding is known for its quality and speed. Given its susceptibility to gaps, the technology is applied in the industrial field with hard automation and dedicated fixtures rather than small-batch production. The latter cannot always guarantee the strict conditions on the fit-up of joints, especially with complex geometries. Gap-bridging techniques may be exploited to overcome these inaccuracies. The present work investigates the simultaneous use of low frequency circular beam oscillation and wire feeding as means to produce a continuous weld seam in the presence of constant air gaps. Lap joint welding of 2 mm-thick AISI301LN and butt joint welding of 3 mm-thick AW6005A-T6 alloy were conducted with gaps up to 1mm. High-speed imaging at 10kHz provided an insight in the dynamics of the oscillating weld pool and spatter formation. Optical inspection and metallographic analyses were used to verify the gap-bridging capability as well as the resulting seam quality
The Influence of Luting Systems on the Microtensile Bond Strength of Dentin to Indirect Resin-based Composite and Ceramic Restorations
No full textMicrotensile bond strength (microTBS) evaluation and fractographic analysis were used to compare four luting systems in the cementation of resin-based composite (RBC) and ceramic disks to dentin. Forty freshly-extracted molars were transversally sectioned to expose flat, deep dentin surfaces. Forty cylindrical specimens (5-mm diameter and 10-mm height), consisting of 20 RBC disks and 20 leucite-based glass ceramic disks, were produced. The RBC disks were sandblasted with 50-microm Al2O3. The ceramic disks were conditioned with 9.5% hydrofluoric acid gel and silane application. All the disks were then bonded to dentin surfaces according to the luting cements to be used: two etch-and-rinse luting agents (XP bond/CoreXFlow; Dentsply [XP]) (Enabond/EnaCem HF; Micerium [ENA]), a self-etch luting system (ED Primer II A+B/Panavia F2.0; Kuraray-Dental [PAN]) and a self-adhesive luting agent (RelyX Unicem; 3M ESPE [UNI]). The adhesive/luting cement systems were applied according to the manufacturers' instructions. The specimens were sectioned perpendicular to the adhesive interface to produce multiple beams, approximately 1 mm2 in area. All the specimen preparations were performed by the same operator. The beams were tested under tension at a crosshead speed of 0.5 mm/minute until failure. The microTBS data were analyzed by two different one-way-ANOVA and multiple comparison Tukey tests (alpha = 0.05). All the fractured beams were observed using a Scanning Electron Microscope (SEM) at 200x magnification for fracture mode determination. The mean bond strength in MPa (SD) for the RBC (Co) and ceramic (Ce) groups were: XP-Co = 31.39 (13.51), ENA-Co = 30.93 (10.17), PAN-Co = 18.29 (10.02), UNI-Co = 19.33 (7.91); XP-Ce = 4.83 (1.86), ENA-Ce = 5.15 (1.66), PAN-Ce = 4.36 (1.80), UNI-Ce = 7.16 (2.52). Statistical analysis showed that the bond strengths were significantly affected by the luting agent employed for both the RBC and ceramic groups (p 0.05) and showed significantly higher bond strengths than the PAN-Co and UNI-Co groups (p < 0.05). On the contrary, the UNI-Ce group showed the highest bond strengths compared to the other ceramic experimental groups (p < 0.05). Regarding failure mode, differences were found between the RBC groups: for the etch-and-rinse luting systems (XP-Co and ENA-Co groups), most failures occurred cohesively in the luting agent, while the self-etch luting system (PAN-Co group) and self-adhesive luting system (UNI-Co group) failed predominantly adhesively at the luting agent-dentin interface. Little differences were found between the ceramic groups, where failure type was primarily adhesive between cement and ceramic
Comprehensive benchmarking of laser welding technologies including novel beam shapes and wavelengths for e-drive copper hairpins
No full textLaser welding is the industrially accepted method for the joining of Cu hairpin windings in the production of electric drives. High brilliance laser beams are scanned over the bare ends of the Cu wires producing a rapid connection through deep penetration remote welding. Despite being an accepted manufacturing method, laser welding of Cu hairpins still requires detailed studies concerning manufacturing productivity and quality. As the availability of novel laser sources with higher power levels, new wavelengths, and beam shaping capabilities increase, the need for benchmarking studies emerges. In this work, six different laser welding systems were compared in terms of process productivity and quality during the welding of Cu hairpins used for automotive traction. The different solutions presented power levels from 3 to 6 kW, with wavelengths from near infrared (NIR) to visible, including in source dynamic beam shaping. The weld bead formation was observed through high-speed imaging. The welds were analyzed in terms of their geometry, internal defects, and most relevantly for their mechanical strength. The results showed advantages of each of the employed system while the laser systems providing the highest irradiance profile produced the fastest weld with more elevated mechanical strength independently from the wavelength
Laser Hairpin Stripping With a New Generation CO2 Laser at Lower Wavelength for E-Drive Manufacturing
No full textElectric drives are conventionally produced with copper hairpin windings. Rather than the flexible winding of thin wires, Cu bars with typically rectangular cross section are separately bent into the desired form and inserted to the stator to form a continuous winding. The open ends to be connected generate the so-called hairpin couples. These regions should be free of the insulating polymer coating in order to apply the successive laser welding operation successfully. The presence of polymeric material in the welded area generates material bursts, spatter, and pores due to the very low vaporization temperature compared to the welded metal. Laser hairpin stripping removes the electrically insulating enamel layer and ensures a clean surface for the successive laser welding operation that produces the contacts. Several types of pulsed wave lasers can be operated producing different types of material removal mechanisms from surface evaporation to material expulsion. CO2 lasers have been long employed in the industry for processing polymeric materials thanks to the high optical absorptivity at IR region. High power CO2 lasers sources can be an appealing solution for the hairpin stripping process combining the high absorption by the polymeric enamel and the low absorptivity of underlying copper. New generation of CO2 lasers at lower wavelengths (i.e. 9.4 μm) can provide relatively smaller spot sizes and possibly enhanced processing. This work proposes a systematic analysis of the process development starting from single pulsed material removal towards areal scanning. The processed material was Polyester (Amide)(Imide) overcoated with Polyamideimide enamel material with 95 μm thickness on ETP Cu (electrolytic tough pitch copper) bars. A CO2 laser operating at 9.4 μm wavelength with 400 W maximum average power was employed. The laser produced μs-long pulses by regulating the pulse repetition rate in the kHz level along with the duty cycle. First the material removal was evaluated at maximum output power and duty cycle varying the pulse duration and the scan speed. The conditions were analyzed categorically assessing partial and complete material removal. Multiple pass scan strategies were developed to remove material in larger areas. The most productive solutions as well as the one providing the surface with the least amount of material remaining on the surface were chosen for further evaluation. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and focal variation microscopy (FVM) were employed to analyze the surface topography, chemistry, and roughness. Using the chosen conditions hairpin couples were stripped and laser welded using a high-power active fiber laser. The quality of the hairpin stripping operation was therefore evaluated also through the outcome of the welding operation in terms of bead geometry and its mechanical strength
A Case Report on Gallbladder Agenesis: Not a Novelty but Still a Laparoscopic Surprise
No full textGallbladder agenesis (GA) is a rare embryological anomaly that presents acute cholecystitis like-symptoms. It is often an incidental finding diagnosed during surgery. We reported a case of GA in a patient who presented with dyspepsia and acute right upper abdomen pain with ultrasonographic signs of acute lithiasic cholecystitis. The preoperative assessment, according to first-level exams, is oriented to the diagnosis of acute lithiasic cholecystitis with atrophy and sclerosis. During laparoscopy, the proximal transverse colon was found strictly adherent to gallbladder fossa. The gallbladder was found to be absent. The surgical procedure consisted of lysis of multiple colo-hepatic adhesions. The diagnosis of congenital GA was made laparoscopically. The postoperative radiological images, based on CT and MR examinations, documented the diagnosis of GA with a biliary duct anatomical variant. The recovery was uneventful and the patient remained symptom-free for more than four years. GA is a clinical challenge that still poses diagnostic and therapeutic dilemmas. Although no diagnostic and therapeutic algorithm is accepted worldwide, due to heterogeneity of clinical scenarios and the variability in hospital facilities, surgeons have to be familiar with this rare entity, and conversion in laparotomy or unnecessary operative procedures should be avoided in the same operative setting
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