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Fatigue crack growth in metallic components: Numerical modelling and analytical solution
Danilo D’Angela,Marianna Ercolino 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.5
The paper presents innovative approaches for the simulation of fatigue crack growth (FCG) in metallic compact tension (CT) specimens using finite element (FE) analysis and analytical solution. FE analysis is performed in ABAQUS using the extended finite element method (XFEM) coupled with the direct cyclic low-cycle fatigue (LCF) approach. Novel methods are developed for the computation of the numerical crack growth by processing the analysis outputs. The numerical modelling is validated by considering past experimental data. The analytical solution for the fatigue life evaluation is formally reviewed, and novel fatigue damage descriptors are defined. The influence of the main sample/testing features on numerical and analytical fatigue life is extensively assessed by a parametric study. The discrepancy between the numerical and analytical estimations of the fatigue life of the components is investigated and correlated to the features of the testing/modelling. A statistical-based correction factor is finally proposed in order to enhance the analytical solution.
Angel A,de Larrazabal,FPSCS,FACS,Corazon Collantes-Jose,FPSCS 대한미용의학회 2017 대한미용의학회지 Vol.1 No.2
Background: Minimally invasive surgery is already at the forefront in all surgical specialties, including cosmetic surgery. Hence, we have adapted and modified our technique to offer a short-scar facelift with minimal tissue dissection and manipulation to surgically rejuvenate the aging face. Objective: This study aimed to surgically address the aging face and neck by employing this modified short-scar rhytidectomy with minimal dissection, manipulation, and using the correct vector suited for Asian faces as an alternative and innovative surgical procedure. Methods: We performed this short-scar facelift by combining the malar fad pad suspension and lamellar low superficial musculoaponeurotic system (SMAS) excision Results: From 2015 to 2017, we have performed 51 facelift procedures with our modification, with 8 men and 43 women, with a mean age of 64.30 years (range, 50-78 years). Of the 51 patients, 29 patients (56.86%) had regular follow-ups. Three complications were noted. One developed post-operative hematoma. The other developed seroma formation. The third developed split thickness skin necrosis. Majority of our patients were satisfied with the results. Conclusion: This combined malar fat pad suspension and lamellar low SMAS excision technique is a simple, safe, and effective alternative procedure for facelift. Level of Evidence: V
The Filipina Connection: the Face of Exploitation in Canada’s Live-in Caregiver Program
Angela G. Hick(Angela G. Hick ),Anton L. Allahar(Anton L. Allahar ) 한국캐나다학회 2011 Asia-Pacific Journal of Canadian Studies (APJCS) Vol.17 No.1
In this paper we explore why the primary pool of employees in Canada’s Live-in Caregiver Program (LCP) are temporary migrant workers, particularly Filipinas, as well as how the Canadian government and its related institutions justify discrepancies in the rights and protections between Canadian workers and those who come legally under Canada’s various migrant worker schemes. In this context specific attention is paid to live-in caregivers or those women who come under the domestic worker scheme. The analysis of the Canadian Live-in Caregiver Program will highlight the dominant ideologies underlying and motivating the federal government’s justification for: (a) the continuation of the program despite great external resistance; (b) the subordinate status of live-in caregivers that derives from their position as “non-citizens;” (c) the subordinate position domestic workers experience as working class women of colour; and (d) the reasoning behind a reliance on female temporary migrant workers of a specific demographic to care for Canadian dependents. To frame the entire discussion we ask (rhetorically) how it is possible for a country such as Canada that prides itself on its positive human rights and worker rights reputation, to defend a program such as the LCP that goes against the much-celebrated image of ‘Canada the good.’
Irritable Bowel Syndrome and Nickel Allergy: What Is the Role of the Low Nickel Diet?
( Angela Rizzi ),( Eleonora Nucera ),( Lucrezia Laterza ),( Eleonora Gaetani ),( Venanzio Valenza ),( Giuseppe M Corbo ),( Riccardo Inchingolo ),( Alessandro Buonomo ),( Domenico Schiavino ),( Antonio 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.1
Background/Aims Irritable bowel syndrome (IBS) is characterized by chronic abdominal pain or discomfort accompanied by abnormal bowel movements. In sensitized subjects, ingested nickel (Ni) may induce gastrointestinal symptoms similar to IBS, in addition to typical systemic cutaneous lesions (systemic nickel allergy syndrome [SNAS]). A low nickel diet could improve the systemic manifestations. We evaluated prevalence of nickel allergy in IBS and effects of low Ni diet on (1) gastrointestinal symptoms control, (2) intestinal barrier function, (3) quality of life, and (4) psychological status of patients with IBS and Ni-sensitized patients. Methods Twenty consecutive patients affected by IBS and suspected SNAS underwent intestinal permeability tests. Gastrointestinal symptoms were evaluated using the visual analogue scale before and after 3 months low Ni diet. Subjects with increased intestinal permeability at baseline repeated nuclear examination after the diet. Results The most frequent profile was diarrhea-predominant IBS (8/20). The low Ni diet induced a significant and constant improvement of gastrointestinal symptoms and an equally significant improvement of visual analogue scale. Mean urinary output of <sup>51</sup>Chromium ethylene-diamine-tetra-acetate (<sup>51</sup>Cr-EDTA) was 5.91%/24 hr (± 2.08), significantly different from the control group (2.20%/24 hr ± 0.60, P < 0.0001). Conclusion This pilot study shows that low Ni diet improves gastrointestinal symptoms in patients with IBS and SNAS. (J Neurogastroenterol Motil 2017;23:101-108)