Academic literature on the topic 'PGD non intrusive'

Abstract Understanding the failure of brittle heterogeneous materials is essential in many applications. Heterogeneities in material properties are frequently modeled through random fields, which typically induces the need to solve finite element problems for a large number of realizations. In this context, we make use of reduced order modeling to solve these problems at an affordable computational cost. This paper proposes a reduced order modeling framework to predict crack propagation in brittle materials with random heterogeneities. The framework is based on a combination of the Proper Generalized Decomposition (PGD) method with Griffith’s global energy criterion. The PGD framework provides an explicit parametric solution for the physical response of the system. We illustrate that a non-intrusive sampling-based technique can be applied as a post-processing operation on the explicit solution provided by PGD. We first validate the framework using a global energy approach on a deterministic two-dimensional linear elastic fracture mechanics benchmark. Subsequently, we apply the reduced order modeling approach to a stochastic fracture propagation problem.

Spoofing attacks using imitations of fingerprints of legal users constitute a serious threat. In this study, a terahertz time domain spectroscopy (TDS) setup in a reflection configuration was used for the non-intrusive detection of fingerprint spoofing. Herein, the skin structure of the finger pad is described with a focus on the outermost stratum corneum. We identified and characterized five representative spoofing materials and prepared thin and thick finger imitations. The complex refractive index of the materials was determined in TDS in the transmission configuration. For dataset collection, we selected a group of 16 adults of various ages and genders. The reflection results were analyzed both in the time (reflected signal) and frequency (reflectivity) domains. The measured signals were positively verified with the theoretical calculations. The signals corresponding to samples differ from the finger-related signals, which facilitates spoofing detection. Thanks to deconvolution, we provide a basic explanation of the observed phenomena. We propose two spoofing detection methods, predefined time–frequency features and deep learning based. The methods achieved high true detection rates of 87.9% and 98.8%. Our results show that the terahertz technology can be successfully applied for spoofing detection with high detection probability.

Introduction: Forsus is a useful appliance for non-compliant Class II problems, however various problems can occur when using them.Objective: To demonstrate a comprehensive series of of critical situations that can occur using the Forsus device and to provide the possible solutions of each complication.Materials & Method: The clinical management of the Forsus appliance was analyzed for eighty consecutively treated patients. The Forsus was used five months on average and pictures and clinical record were registered each time a patient had a problem or an injury.Discussion: The most common problem was breakage of the appliance. Breakage could occur as debonding of the lower first premolars or unsoldering of the upper first molar tubes. Lower premolar debonding could be prevented and fixed with an extra layer of flow composite surrounding the bracket base. Lesions of the cheek mucosa were found in several patients. A soft cotton pad used as “wax” was an effective solution to allow soft tissue healing and to prevent spring rubbing against the cheek. Upper molar intrusion occurred mainly when second molars were not included in the upper arch. Some patients experienceddisconnection of the spring and the push rod while opening the mouth wide. They were taught to self-adjust the appliance.Conclusion: The use of the Forsus appliance may lead to relatively frequent problems that the orthodontist can easily preventand manage.

AbstractReduced order modeling (ROM) techniques are numerical methods that approximate the solution of parametric partial differential equation (PED) by properly combining the high-fidelity solutions of the problem obtained for several configurations, i.e. for several properly chosen values of the physical/geometrical parameters characterizing the problem. By starting from a database of high-fidelity solutions related to a certain values of the parameters, we apply the proper orthogonal decomposition with interpolation (PODI) and then reconstruct the variables of interest for new values of the parameters, i.e. different values from the ones included in the database. Furthermore, we present a preliminary web application through which one can run the ROM with a very user-friendly approach, without the need of having expertise in the numerical analysis and scientific computing field. The case study we have chosen to test the efficiency of our algorithm is represented by the aortic blood flow pattern in presence of a left ventricular (LVAD) assist device when varying the pump flow rate.

Despite significant development in facial recognition (FR), current FR systems are exposed to spoofing attacks like printed photo attacks, 3D mask attacks, video replay attacks, and many more. Several anti-spoofing approaches have been proposed to assess whether the person in front of the camera is real or fake. Developing effective protection mechanisms against these threats is a challenging task. This paper gives a brief overview of various presentation attack detection (PAD) techniques, which are categorized into intrusive and non-intrusive approaches. Each technique is examined in terms of its execution, benefits, and drawbacks and also provides information on modern anti-spoofing techniques.

Boxing is a purely masculine activity and it inhabits a purely masculine world. […] Boxing is for men, and it is about men, and is men. (Joyce Carol Oates) IntroductionWriting about boxing is an intimate, private, and unusual activity. Although a decade has passed since I first “stepped into the ring” (sparring or fighting), I have not engaged with boxing in academic terms. I undertook a doctoral degree from 2012 to 2016, during which I competed and won amateur titles in three different countries. Boxing, in a sense, shadowed my research. My fieldwork, researching heritage foods networks, brought me to various locales, situating my body in reference to participants and academics as well as my textual analysis. My daily interactions and reflections in the boxing gym, though, were marginalised to give priority to my doctorate. In a mirrored journey to Wacquant’s “carnal ethnography of the skilled body” (Habitus 87), I boxed as a hobby. It was a means to escape my life as a doctoral student, my thesis, and the library. Research belonged to the realm of academia; boxing, to the realm of the physical. In this paper, I seek to implode this self-imposed distinction.Practising the “noble art,” as boxing is commonly called, profoundly altered not only my body but also my way of seeing the world, myself, and others. I explore these themes through an autoethnographic account of my experience in the ring. Focusing on sparring, rather than competing, I explore conceptualisations of my face as a material, as well as part of my body, and also as a surface for violence and apprenticeship. Reflecting upon a decade of sparring, the analysis presented in this paper is grounded in the phenomenological tradition whereby knowledge is not an abstract notion that exists over and above felt experience: it is sensed and embodied through practice.I delve into the narratives of my personal “social logic of a bodily craft” of boxing (Wacquant, Habitus 85). More specifically, I reflect upon my experiences of getting hit in the face by men in the ring, and the acclimatisation required, evolving from feelings of intrusion, betrayal, and physical pain to habit, and at times, excitement. As a surface for punching, my face became both material and immaterial. It was a tool that had to be tuned to varying degrees of pain to inform me of my performance as well as my opponent’s. Simultaneously, it was a surface that was abstracted and side-lined in order to put myself purposefully in harm’s way as one does when stepping into the ring. Through reflecting on my face, I consider how the sport offered new embodied experiences through which I became keenly aware of my body as a delineated target for—as well as the source of—violence. In particular, my body boundaries were profoundly reconfigured in the ring: sparring partners demonstrated their respect by hitting me, validating both my body and my skill as a boxer. In this manner, I discuss the spatiality of the ring as eliciting transitions of felt and abstracted pain as well as shaping my self-image as a re-gendered boxer in the ring and out. Throughout my account, I briefly engage with Wacquant’s discussion of “pugilistic habitus” (Body 99) and his claims that boxing is the epitome of masculine valour. In the final section, I conclude with deliberations upon the new bodily awareness(es) I gained through the sport, and the re-materiality I experienced as a strong woman.Methodological and Conceptual FrameworksThe analysis in this paper is based on the hybrid narrative of ethnography and autobiography: autoethnography. In the words of Tami Spry, autoethnography is “a self-narrative that critiques the situatedness of self and others in social context” (710). As such, I take stock in hindsight (Bruner; Denzin) of the evolution of my thoughts on boxing, my stance as a boxer, and the ways the ring has affected my sense of self and my body.Unlike Wacquant's “carnal ethnography” (Habitus 83) whose involvement with boxing was foregrounded in an academic context where he wrote detailed field-notes and conducted participant observation, my involvement was deliberately non-academic until I began to write this paper. Based on hindsight, the data collected through this autoethnography are value-inflected in ways that differ from other modes of data collection. But I have sought to recreate a dialectic between perceptual experience and cultural practices and patterns, in a manner aligned with Csordas’s paradigm of embodiment. My method is to “retrospectively and selectively write about epiphanies that stem from, or are made possible by, being part of a culture” (Ellis et al. 276) of boxing. These epiphanies, as sensed and embodied knowledge, were not solely conceptual moments but also physical realisations that my body performed, such as understanding—and executing—a well-timed slip to the side to avoid a punch.Focusing on my embodied experiences in the ring and out, I have sought to uncover “somatic modes of attention:” the “culturally elaborated ways of attending to and with one’s body in surroundings that include the embodied presence of others” (Csordas 138). The aim of this engagement is to convey my self-representation as a boxer in the ring, which emerged in part through the inter-subjectivity of interacting with other boxers whilst prioritising representations of my face. As such, my personal narrative is enmeshed with insights gleaned during embodied epiphanies I had in the ring, interweaving storytelling with theory.I have chosen to use the conventions of storytelling (Ellis and Ellingson) to explore the defining moments that shaped the image I hold of myself as a boxer. My personal narrative—where I view myself as the phenomenon—seeks “to produce aesthetic and evocative thick descriptions of personal and interpersonal experience” (Ellis et al. 287) whilst striving to remain accessible to a broader audience than within academia (Bochner). Personal narratives offer an understanding of the “self or aspect of a life as it intersects with a cultural context, connect to other participants as co-researchers, and invite readers to enter the author's world and to use what they learn there to reflect on, understand, and cope with their own lives” (Ellis 14; see also Ellis et al. 289).As the focus of my narrative is my face, I used my body, in Longhurst et al.’s words, as the “primary tool through which all interactions and emotions filter in accessing subjects and their geographies” (208). As “the foundation of the entire pugilistic regimen”, the body is the site of an intimate self-awareness, of the “body-sense” (Heiskanen 26). Taking my body as the starting point of my analysis, my conceptual framework is heavily informed by Thrift’s non-representational theory, enabling me to inquire into the “skills and knowledges [people] get from being embodied beings” (127), and specifically, embodied boxers. The analysis presented here is thus based on an “epistemic reflexivity” (Wacquant, Habitus 89) and responds to what Wacquant coins the “pugilistic habitus” (Body 99): a set of acquired dispositions of the boxer. Bourdieu believes that people are social agents who actively construct social reality through “categories of perception, appreciation and action” (30). The boxing habitus needs to be grasped with one’s body: it intermingles “cognitive categories, bodily skills and desires which together define the competence and appetence specific to the boxer” (Wacquant, Habitus 87). Through this habitus, I construct an image of myself not only as a boxer, but also as a re-gendered being, directly critiquing Wacquant’s arguments of the “pugilist” as fundamentally male.Resistance to Female BoxingMischa Merz’s manuscript on her boxing experience is the most accurate narrative I have yet read on female boxing, as a visceral as well as incorporeal experience, which led Merz to question and reconsider her own identity. When Merz published her manuscript in 2000, six years before I put the gloves on, the boxing world was still resisting the presence of women in the ring. In the UK, licenses for boxing were refused to women until 1998, and in New South Wales, Australia, it was illegal for women to compete until December 2008. It was not until 2012 that female boxing became internationally recognised as a sport in its own right. During the London Olympics, after a sulphurous debate on whether women should be made to box in skirts to “differentiate” them from men, women were finally allowed to compete in three weight categories, compared to ten for men.When I first started training in 2006 at the age of 21, I was unaware of the long list of determined and courageous women who had carved their way—and facilitated mine—into the ring, fighting for their right to practise a sport considered men’s exclusive domain. By the time I started learning the “sweet science” (another popular term used for boxing), my presence was accepted, albeit still unusual. My university had decreed boxing a violent sport that could not be allowed on campus. As a result, I only started boxing when I obtained a driving licence, and could attend training sessions off-campus. My desire to box had been sparked five years before, when I viewed Girlfight, a film depicting a young woman’s journey into the ring. Until then, I had never imagined a woman could box, let alone be inspirational in the use of her strength, aggression, and violence; to be strong was, for me, to be manly—which, as a woman, translated as monstrous or a perversion. I suddenly recognised in boxing a possibility to rid myself of the burden of what I saw as my bulk, and transform my body into a graceful pugilist—a fighter.First Sparring SessionTwo months after I had first thrown a punch in my coach’s pad—the gear coaches wear to protect their hands when a boxer is punching them to train—I was allowed into the ring to spar. Building up to this moment, I had anticipated and dreaded my first steps in the ring as the test of my skill and worthiness as a boxer. This moment would show my physical conditioning: whether I had trained and dieted correctly, if I was strong or resilient enough to fight. More crucially, it would lay bare my personality, the strength of my character, the extent of my willpower and belief in myself: it would reveal, in boxing terminology, if I had “heart.” Needless to say I had fantasised often about this moment. It was my initiation into the art of being punched and I hoped I would prove myself a hardened individual, capable of withstanding pain without flinching or retreating.The memory of the first punch to my face—my nose, to be exact—remains clear and vivid. My sparring partner was my coach, a retired boxer who hit me repeatedly in the head during the entirety of my first round. Getting hit in the face for the first time is a profound moment of rupture. Until then, my face had been a bodily surface reserved for affective gestures by individuals of trust: kisses of greeting on the cheeks or caresses from lovers. Only once had I been slapped, in an act of aggression that had left me paralysed with shock and feeling violated. Now in the ring, being punched in the face by a man I trusted, vastly more experienced and stronger than I, provoked a violent reaction of indignation and betrayal. Feelings of deceit, physical intrusion, and confusion overwhelmed me; pain was an entirely secondary concern. I had, without realising, assumed my coach would “go easy” on me, softening his punches and giving me time to react adequately to his attacks as we had practised on the pads. A couple of endless minutes later, I stepped out of the ring, breathless and staring at the floor to hide my tears of humiliation and overwhelming frustration.It is a common experience amongst novices, when first stepping into the ring, to forget everything they have been taught: footwork, defence, combinations, chin down, guard up … etc. They often freeze, as I did, with the first physical contact. Suddenly and concretely, with the immediacy of pain, they become aware of the extent of the danger they have purposely placed themselves in. The disturbance I felt was matched in part by my belief that I was essentially a coward. In an act condemned by the boxing community, I had turned my face away from punches: I tried to escape the ring instead of dominating it. Merz succinctly describes this experience in the boxing realm: “aspects of my character were frequently tossed in my face for assessment. I saw gaping holes in my tenacity, my resilience, my courage, my athleticism” (49). That night, I felt an unfamiliar sting as I took my jumper off, noticing a slight yet painful bruise on the bridge of my nose. It reminded me of my inadequacy and, I believed at the time, a fundamental failure of character: I lacked heart.My Face: A Tool for Sensing and Ignoring PainTo get as accustomed as a punching bag to repeated hits without flinching I had to mould my face into a mask of impassivity, revealing little to my opponent. My face also became a calibrated tool to measure my opponent’s skill, strength, and intent through the levels of pain it would experience. If an opponent repeatedly targeted my nose, I knew the sparring session was not a “friendly encounter.” Most often though, we would nod at each other in acknowledgement of the other’s successful “contact,” such as when their punches hurt my body. The ring is the only space I know and inhabit where the display of physical violence can be interpreted as a “friendly gesture” (Merz 12).Boxers, like most athletes, are carefully attuned to measuring the degrees of pain they undergo during a fight and training, whilst accomplishing the paradoxical feat—when they are hit—of setting aside that pain lest it be a distraction. In other words, boxers’ bodies are both material and immaterial: they are sites for accessing sensory information, notably pain levels, as well as tools that—at times detrimentally—have learned to abstract pain in the effort to ignore physical limitations, impediments or fatigue. Boxers with “heart,” I believe, are those who inhabit this duality of material and immaterial bodies.I have systematically been questioned whether I fear bruising or scarring my face. It would seem illogical to many that a woman would voluntarily engage in an activity that could blemish her appearance. Beyond this concern lies the issue, as Merz puts it, that “physical prowess and femininity seem to be so fundamentally incompatible” (476). My face used to be solely a source of concern as a medium of beautification and the platform from which I believed the world judged my degree of attractiveness. It also served as a marker of distinction: those I trusted intimately could touch my face, others could not. Throughout my training, my face evolved and also became an instrument that I conditioned and used strategically in the ring. The bruises I received attested to my readiness to exchange punches, a mark of valour I came to relish more than looking “nice.”Boxing has taught me how to feel my body in new ways. I no longer inhabit an “absent body” (Leder). I intimately know the border between my skin and the world, aware of exactly how far my body extends into that world and how much “punishment” (getting hit) it can withstand: boxing—which Oates (26) observed as a spectator rather than boxer—“is an act of consummate self-determination—the constant re-establishment of the parameters of one’s being.” A strong initial allure of boxing was the strict discipline it gave to my eating habits, an anchor—and at times, a torture—for someone who suffered from decade-long eating disorders. Although boxing plagued me with the need to “make weight”—to fight in a designated weight category—I no longer sought to be as petite as I could manage. As a female boxer, I was reminded of my gender, and my “unusual” body, as I am uncommonly big, strong, and heavy compared to most female fighters. I still find it difficult to find women to spar with, let alone fight. Unlike in the world outside the gym, though, my size is something I continuously learn to value as an advantage in the ring, a tool for affirmation, and significantly, a means of acceptance by, and equality with, men.The Ring: A Place of Re-GenderingAs sparring became routine, I had an epiphany: what I had taken as an act of betrayal from my coach was actually one of respect. Opponents who threw “honest” (painful) punches esteemed me as a boxer. I have, to this day, very rarely sparred with women. I often get told that I punch “like a guy,” an ability with which I have sought to impress coaches and boxers alike. As such, I am usually partnered with men who believe, as they have told me, that hitting a “girl”—and even worse, hitting a girl in the face—is simply unacceptable. Many have admitted that they fear hurting me, though some have quickly wanted to after a couple of exchanges. I have found that their views of “acceptable” violence seem unchanged after a session, as I believe they have come to view me as a boxer first and as a woman second.It would be disingenuous to omit that boxing attracted me as much for the novelty status I have gained within and outside of it. I have often walked a thin line between revelling in the sense of belonging that boxing provides me—anchored in a feeling that gender no longer matters—and the acute sense of feeling special because I am a woman performing as a man in what is still considered a man’s world. I have wavered between feeling as though I am shrugging off the very notion of gender in the ring, to deeply reconsidering what my gender means to me and the world, embracing a more fluid and performative understanding of gender than I had before (Messner; Young).In a way, my sense of self is shaped conflictingly by the ways in which boxers behave towards me in the ring, and how others see me outside of the boxing gym. As de Bruin and de Haan suggest, my body, in its active dimension, is open to the other and grounds inter-subjectivity. This inter-subjectivity of embodiment—how other bodies constitute my own sensory and perceptual experience of being-in-the-world—remains ambivalent. It has led me to feel at times genderless—or rather, beyond gender—in the ring and, because of this feeling, I simultaneously question and continuously re-explore more vividly what can be understood as “female masculinity” (Halberstam). As training progressed, I increasingly felt that:If women are going to fight, we have to be reminded, at every chance available, time and again, that they are still feminine or capable, at least, of wearing the costume of femininity, being hobbled by high heels and constrained by tight dresses. All female athletes in a way are burdened with having to re-iterate this same public narrative. (Merz)As I learned to box, I also learned to delineate myself alongside the ring: as I questioned notions of gender inside, I consequently sought to reaffirm a specific and static idea of gender through overt femininity outside the ring, as other female athletes have also been seen to do (Duncan). During my first years of training, I was the only woman at the gyms I trained in. I believed I had to erase any physical reminders of femininity: my sport clothes were loose fitting, my hair short, and I never wore jewellery or make-up. I wanted to be seen as a boxer, not a woman: my physical attractiveness was, for once, irrelevant. Ironically, I could not conceive of myself as a woman in the ring, and did not believe I could be seen as a woman in the ring. Outside the gym, I increasingly sought to reassert a stereotypical feminine appearance, taking pleasure in subverting another set of beliefs. People are usually hesitant to visualise a woman in a skirt, without a broken nose, as a competitive fighter with a mouth guard and headgear. As Wacquant succinctly put it, “I led a sort of Dr. Jekyll-and-Mr. Hyde existence” (Habitus 86), which crystallised when one of my coaches failed to recognise me on three occasions outside the gym, in my “normal” clothes.I have now come to resent profoundly the marginal, sensationalised status that being a boxer denotes for a woman. This is premised on particular social norms surrounding gender, which dictate that if a woman boxes, she is not “your usual” woman. I have striven to re-gender my experience, especially in light of the recent explosion of interest in female boxing, where new norms are being established. As I have trained around the world, including in Cuba, France, and the USA, and competed in the UK, Mexico, and Belgium, I have valued the tacit connection between those who practice the “noble art.” Boxing fashions a particular habitus (Bourdieu), the “pugilistic habitus” (Wacquant, Body 12). Stepping into the ring, and being able to handle getting hit in the face, constitutes a common language that boxers around the world, male and female, understand, value, and share; a language that transcends the tacit everyday embodiments of gender and class. Boxing is habitually said to give access to an upward mobility (Wacquant, Habitus; Heiskanen). In my case, as a white, educated, middle-class woman, boxing has given me access to cross-class associations: I have trained alongside men who had been shot in Coventry, were jobless in Cuba, or dealt with drug gangs in Mexico. The ring is an equalising space, where social, gender—and in my experience, ethnic—divides can be smoothed down to leave the pugilistic valour, the property of boxing excellence, as the main metric of appreciation.The freedom I have found in the ring is one that has allowed my gendered identity to be thought of in new and creative ways that invite continuous revision. I have discovered myself not solely through the prism of a gendered lens, but as an emotive athlete, and as a person desperate to be accepted despite—or because of—her physical strength. I find myself returning to Merz’s eloquence: “boxing cannot help but make you question who you really are. You cannot hide from yourself in a boxing ring. It might seem a crazy path to self-knowledge, but to me it has been the most rich, rewarding, and perhaps, the only true one” (111). Using Wacquant’s own words to disprove his theory that boxing is fundamentally a virile activity that reaffirms specific notions of masculinity, to become a boxer is to “efface the distinction between the physical and the spiritual [...] to defy the border between reason and passion” (Body 20). In my view, it is to implode the oppositional definitions that have kept males inside the ring and females, out. The ring, in ways unrivalled elsewhere, has shown me that I am not reducible, as the world has at times convinced me, to my strength or my gender. I can, and indeed do, coalesce and transcend both.ConclusionAfter having pondered the significance of the ring to my life, I now begin to understand Merz’s journey as “so much more than a mere dalliance on the dark side of masculine culture” (21). When I box, I am always boxing against myself. The ring is the ultimate space of revelation, where one is starkly confronted with one’s own weaknesses and fears. As a naked mirror, the ring is also a place for redemption, where one can overcome flaws, and uncover facets of who one is. Having spent almost as much time at university as I have boxing, it was in the ring that I learned that “thinking otherwise entails being otherwise, relating to oneself, one’s body, and ambient beings in a new way” (Sharp 749). Through the “boxing habitus,” I have simultaneously developed a boxer’s body and habits as well as integrated new notions of gender. As an exercise in re-gendering, sparring has led me to reflect more purposefully on the multiplicity of meanings that gender can espouse, and on the possibilities of negotiating the world as both strong and female. Practising the “noble art” has given me new tools with which to carve out, within the structures of the society I inhabit, liberating possibilities of being a pugilistic woman. However, I have yet to determine if women have fashioned a space within the ring for themselves, or if they still need to reaffirm a gendered identity in the eyes of others to earn the right to get hit in the face.References Bochner, Arthur P. “It’s about Time: Narrative and the Divided Self.” Qualitative Inquiry 3.4 (1997): 418–438.Bourdieu, Pierre. The Logic of Practice. Stanford, California: Stanford UP, 1990.Bruner, Jerome. “The Autobiographical Process.” The Culture of Autobiography: Constructions of Self-Representation. Ed. Robert Folkenflik. Vol. 6. Stanford UP, 1993. 38–56.Csordas, Thomas. “Somatic Modes of Attention.” Cultural Anthropology 8.2 (1993): 135–156.De Bruin, Leon, and Sanneke de Haan. “Enactivism and Social Cognition: In Search of the Whole Story.” Cognitive Semiotics 4.1 (2009): 225–50.Denzin, Norman K. Interpretive Biography. London: Sage, 1989.Duncan, Margaret C. “Gender Warriors in Sport: Women and the Media.” Handbook of Sports and Media. Eds. Arthur A. Raney and Jennings Bryant. Lawrence Erlbaum Associates, 2006. 231–252.Ellis, Carolyn. The Ethnographic I: A Methodological Novel about Autoethnography. Walnut Creek, CA: AltaMira Press, 2004.Ellis, Carolyn, Tony E. Adams, and Arthur P. Bochner. “Autoethnography: An Overview.” Historical Social Research/Historische Sozialforschung (2011): 273–90.Ellis, Carolyn, and Laura Ellingson. “Qualitative Methods.” Encyclopedia of Sociology. Eds. Edgar F. Borgatta and Rhonda JV Montgomery. Macmillan Library Reference, 2000. 2287–96.Halberstam, Judith. Female Masculinity. Durham: Duke UP, 1998.Heiskanen, Benita. The Urban Geography of Boxing: Race, Class, and Gender in the Ring. Vol. 13. Routledge, 2012.Girlfight. Dir. Karyn Kusama. Screen Gems, 2000.Leder, Drew. The Absent Body. Chicago: U of Chicago P, 1990.Longhurst, Robyn, Elsie Ho, and Lynda Johnston. “Using ‘the Body’ as an Instrument of Research: Kimch’i and Pavlova.” Area 40.2 (2008): 208–17.Messner, Michael. Out of Play: Critical Essays on Gender and Sport. New York: SUNY Press, 2010.Merz, Mischa. Bruising: A Boxer’s Story. Sydney: Pan Macmillan, 2000.Oates, Joyce Carol. On Boxing. Garden City, New York: Harper Collins, 1987.Sharp, Hasana. “The Force of Ideas in Spinoza.” Political Theory 35.6 (2007): 732–55.Spry, Tami. “Performing Autoethnography: An Embodied Methodological Praxis.” Qualitative Inquiry 7.6 (2001): 706–32.Thrift, Nigel. “The Still Point: Resistance, Expressive Embodiment and Dance.” Geographies of Resistance (1997): 124–51.Wacquant, Loïc. Body & Soul. New York: Oxford UP, 2004.———. “Habitus as Topic and Tool: Reflections on Becoming a Prizefighter.” Qualitative Research in Psychology 8.1 (2011): 81–92.Young, Iris Marion. Throwing like a Girl and Other Essays in Feminist Philosophy and Social Theory. Bloomington, Indiana: Indiana UP, 1990.

L'un des principaux avantages de la méthode «Proper Generalized Decomposition», par rapport à d'autres méthodes de réduction de modèles, réside dans son adéquation pour calculer des représentations séparées dans l’espace pour des domaines dégénérés de type cartésien, tels que des plaques ou des coques. L'objectif principal de cette thèse est de généraliser les représentations séparées dans l’espace aux domaines non cartésiens, en introduisant la notion de représentations séparées. Les représentations séparées de type global-local peuvent être comprises comme une décomposition multiplicative dans laquelle les modes locaux capturent la solution à une échelle fine, tandis que les modes globaux résolvent une échelle grossière. Pour ce faire, deux stratégies sont proposées. La première proposition est basée sur la partition de l'unité et combine les niveaux de discrétisation globale et locale, basés sur une partition du domaine. Cette approche construit une représentation séparée qui fournit l'enrichissement local, sans qu'il soit nécessaire de connaître a priori la solution, ni de mettre en oeuvre des problèmes locaux auxiliaires pour déterminer l'enrichissement. La deuxième stratégie est consacrée à la construction de représentations séparées de type global-local de manière moins intrusive, compatible avec le standard des éléments finis. Par conséquent, nous nous basons sur l’assemblage FEM standard des opérateurs et utilisons la PGD comme résolveur algébrique itératif. La continuité sur les limites de la partition du domaine n'a pas besoin d'être imposée explicitement, car elle constitue une propriété intégrée dans les opérateurs FEM
One of the main advantages of the Proper Generalized Decomposition method, when compared to other model reduction methods, lies in its adequacy to compute space separated representations in Cartesian-like degenerated domains, such as plates or shells. The main objective of this thesis is to generalize space separated representations to non-Cartesian domains, by introducing the notion of Global-Local separated representations. Global-Local separated representations can be understood as a multiplicative decomposition in which the local modes capture the solution at the finer scale, while the global modes solve the coarser scale. To this aim, two strategies are proposed. The first proposal is based on the partition of unity, and combines the global and local discretization levels, based on a partition of the domain. It builds a separated representation that provides the local enrichment, without the need for a priori knowledge of the solution, nor the implementation of auxiliary local problems to determine the enrichment. The second strategy is devoted to the construction of Global-Local separated representations in a less intrusive manner, compatible with the finite element standard. Therefore, we rely on standard FEM assembly of the operators and use the PGD as an algebraic iterative solver. Continuity on the boundaries of the domain’s partition does not need to be imposed explicitly, as it comes as a built-in property of the FEM operators

Woven reinforced composites are often hindered by challenges in accurately predicting their mechanical behavior. This obstacle primarily stems from the heterogeneous nature of these materials. Consequently, employing multi-scale approaches becomes imperative to ascertain their overall responses under complex loading conditions, incorporating detailed descriptions of microstructure and the constitutive laws governing their components. However, effectively incorporating these methodologies into real-scale applications, particularly within FE² analyses, remains challenging due to the significant computational requirements. This challenge intensifies when numerous direct calculations are necessary for testing various configurations, a critical aspect in optimization, inverse analysis, or real-time simulations. The need for such calculations adds to the computational demands, posing a significant obstacle to integrated into practical applications. To address these issues, while considering the scale effects, this thesis aims to develop efficient numerical tools to achieve accurate and fast predictions of woven composite response. First, we develop virtual twins (multiparametric solution) for real-time prediction of composite response, using non-intrusive Proper Generalized Decomposition (PGD) based methods. This aims at providing an accurate approximation of these high-dimensional problems, that involved several microstructural parameters, with limited dataset. These multiparametric solutions are constructed for both linear and nonlinear behavior including history- and rate-dependent behaviors. Second, we develop an approach based on Artificial Neural Networks (ANNs) to perform a macroscopic surrogate model of composites. This model, referred to as Multiscale Thermodynamics Informed Neural Networks (MuTINN), is founded on thermodynamic principles and introduces specific quantities of interest that serve as internal state variables at the macroscopic level. This captures efficiently the state and evolution laws governing the history-dependent behavior of these composites while retaining the thermodynamic admissibility and the physical interpretability of their overall responses. This approach has successfully associated with FE code, streamlining the application of multiscale FE-MuTINN approach for composite structure computations. The prediction capabilities of the proposed approach are demonstrated across the material scales, exemplified through diverse instances of woven composite structures. These applications account for anisotropic yarn damage and an elastoplastic polymer matrix behavior. This promises a potential solution to alleviate the computational challenges associated with multiscale simulations of large composite structures and paving the way for the development of a hybrid twin solution
Although woven reinforced composites are experiencing rapid growth across various engineering and industrial domains, their widespread adoption is often hindered by challenges in accurately predicting their mechanical behavior. This obstacle primarily stems from the heterogeneous nature of these materials. Consequently, employing multi-scale approaches becomes imperative to predict their overall response under complex loading conditions, incorporating detailed descriptions of microstructure and the constitutive laws governing their components. However, effectively incorporating these methodologies into real-scale applications, particularly within FE² analyses, remains challenging due to the significant computational requirements they entail. This challenge intensifies when numerous direct calculations are necessary for testing various configurations, a critical aspect in optimization, inverse analysis, or real-time simulations. The need for such calculations adds to the computational demands, posing a significant obstacle to integrated into practical applications. To address these issues, while considering the scale effects, this thesis aims to develop efficient numerical tools to achieve accurate and fast predictions of woven composite response. First, we develop virtual twins (multiparametric solution) for real-time prediction of composite response, using non-intrusive Proper Generalized Decomposition (PGD) based methods. This aims at providing an accurate approximation of high-dimensional problems, that involved several microstructural parameters, with limited dataset. These multiparametric solutions are constructed for both linear and nonlinear behavior including history- and rate-dependent behaviors. Second, we develop an approach based on ANN to perform a macroscopic surrogate model of composites. This model, referred to as Multiscale Thermodynamics Informed Neural Networks (MuTINN), is founded on thermodynamic principles and introduces specific quantities of interest that serve as internal state variables at the macroscopic level. This captures efficiently the state and evolution laws governing the history-dependent behavior of these composites while retaining the thermodynamic admissibility and the physical interpretability of their overall responses. This approach has successfully associated with FE code, streamlining the application of multiscale FE-MuTINN approach for composite structure computations. The prediction capabilities of the proposed approach are demonstrated across the material scales, exemplified through diverse instances of woven composite structures. These applications account for anisotropic yarn damage and an elastoplastic polymer matrix behavior. This promises a potential solution to alleviate the computational challenges associated with multiscale simulations of large composite structures and paving the way for the development of a hybrid twin solution

Abstract Ideas about the genesis of sulfide nickel-copper deposits largely rely on the geology and type of major deposits or new discoveries of the times in which they were proposed. Nickel-copper sulfides in the Norwegian gabbronorite intrusions and in the Sudbury Complex were the early examples supporting the conclusion that mafic intrusions were the main host rocks for sulfide nickel-copper deposits. Experimental work by the Norwegian geochemist J. H. L. Vogt at the beginning of the twentieth century created a firm foundation for the hypothesis of magmatic segregation. However, some of the geologic observations of the Sudbury deposits were in contradiction to the magmatic segregation theory, and many authors considered hy-drothermal processes as the main accumulation mechanism of Sudbury-type Ni-Cu sulfides. These two main theories, magmatic and hydrothermal, still prevail in genetic considerations today. The discovery of shock metamorphic structures around Sudbury led to the idea that the Sudbury Complex was an old meteorite impact site and that the mafic intrusion with Ni-Cu sulfides followed the structure of a meteorite crater. After lively discussion, this idea has been widely accepted, but the type of magmatism, composition of primary melts, assimilation of silicate magma, and emplacement as well as localization of sulfides are still under study. Discoveries of ultramafic-hosted nickel sulfides in Manitoba, Canada, and, later on, the komatiite-associated massive nickel sulfides in Western Australia awakened the discussion of genetic models of nickel sulfides in ultramafic host rocks, which has continued until today. Some studies published in the 1980s indicated that the komatiitic ultramafic flows of the Kambalda area, Western Australia, formed deep thermal erosion channels in the underlying supracrustal sequence, and the lavas assimilated volcanic and sedimentary material. The massive Ni-Cu sulfides formed from the assimilated barren sedimentary sulfides and accumulated at the basal depressions of the komatiitic flows. Experimental studies widened knowledge of the origin of the Ni-Cu sulfides. In the 1960s the sulfide mineral stabilities and composition of sulfide phases were the main targets of study. In the 1970s the sulfide-silicate melt system was examined through the calculation of distribution coefficients between sulfides and silicates. Also, the importance of the magma/sulfide mass ratio (R factor) was discovered. Sulfur isotope studies of the Norilsk deposit, Siberia, proved that sedimentary sulfur was extracted from underlying sediments and reacted with metals in mafic magma to form Ni-Cu sulfide deposits. Since then, the origin of sulfur in Ni-Cu sulfides has been a topic of continuous interest. Geochemistry of platinum-group elements (PGE) forms an essential part in the recent studies of Ni-Cu sulfides. Not only are these elements important additional commodities of the deposits, but their distribution has proved to be an important indicator of the evolution of mafic magma. A debate on the origin of platinum-group element deposits is revolving around magmatic and hydrothermal models, resembling the discussion of the genetic theories of Ni-Cu sulfides. Recent studies prove that, owing to high distribution coefficients, magmatic sulfides accumulate a high proportion of platinum-group elements, but the elements are also remobilized by hydrothermal fluids and accumulated with them in suitable environments, forming high-grade deposits. Magmatic sulfides have been a target of international research programs, and IGCP project 161 has widened the knowledge of this type of ore deposit. It is now well known that the variation in composition and structure of magmatic sulfides and platinum-group elements is linked with the origin and composition of mafic magmas, fluid dynamics, emplacement of intrusion, magma mixing and assimilation, crystal fractionation, and partitioning of elements between sulfide and silicate melts, as well as hydrothermal and metamorphic remobilization.

A robust shape optimization procedure based on a multi-objective genetic algorithm coupled to a non-intrusive uncertainty quantification analysis was applied to a transonic inviscid flow of a dense gas over a plane turbine cascade. The goal was to simultaneously improve the mean turbine performance and the system stability under fluctuating thermodynamic inlet conditions. Despite an elevated computational cost, the optimization procedure was capable of generating a Pareto front of turbine geometries which improved the mean isentropic turbine efficiency μ(ηs) over the baseline profile, while limiting the solution variability in terms of the coefficient of variation of the power output CV(P2D). In addition to demonstrating an excellent parallel scalability over 1600 processors, the robust optimization revealed that variability of CV(P2D) depends more on the variation of inlet conditions than turbine geometry. A posteriori stochastic analyses on selected optimized turbine geometries allowed an investigation of flow behavior variability, as well as propositions for the improved selection of robust optimization cost criteria in future simulations.

An active flow control system for reducing distortion in serpentine inlets was developed using non-intrusive microphones as feedback sensors. While the serpentine inlet can provide large benefits to an air vehicle by reducing its overall size and therefore weight, it unfortunately delivers a non-uniform (spatially-distorted) flow to the compressor due to the formation of a secondary flow created by separation of the turbulent boundary layer in the aggressive turn. An active means of controlling distortion has been developed using an array of micro air jet vortex generators. It was hypothesized that microphones in the vicinity of the distorted flow would record higher amplitudes pressure fluctuations compared to those microphones in the vicinity of the undistorted flow. Experiments showed that the difference between the microphone readings in these two flow regimes was correlated to the distortion level. This difference in microphone signals was then used as feedback in a PID control system that regulated spatial distortion levels during steady flight conditions, as well as sudden ramps in aircraft speed.

Abstract Bonding is an attractive assembly solution in many ways. Indeed, it is a non-intrusive and cold solution enables to assemble mono or multi-material structures. This assembly technique is particularly interesting for the installation of equipment or repairs when welding is prohibited, such as in ATEX-type risk areas. For many years, COLD PAD has been developing bonded structural repair solutions and non-intrusive mechanical fasteners for marine environment. Their reinforcement product ColdShield™ [1], has been validated thanks to a previous collaboration with Bureau Veritas. From his side, Bureau Veritas is updating the guidance Note NI613 Adhesive Joints and Patch Repairs [2] to consider new development and innovation achieved in this technical domain. The objective of this paper is initially to present the different methods for evaluating the resistance of bonded assemblies proposed by Bureau Veritas. Two application cases of bonded repair will be detailed with the associated lessons learnt in terms of reliability. The first one concerns a conventional steel-steel bonded repair, one of studied applications within the framework of the JIP Strength Bond Offshore [3]. For this application, the stress approach and the combined stress-energy method will be explained as well as the use of cohesive elements for numerical simulations. The second one is the design assessment of the ColdShield™ reinforcement solution [4], which contributes to hull girder strength for Floating Production Storage and Offloading (FPSO) hull repair, and for which a stress approach is possible due to the specificity of the design. Results of both applications are analysed, compared and commented. In conclusion, the paper will highlight the importance of the calculation methodology and its robustness to avoid a misinterpretation of the strength.

<div class="section abstract"><div class="htmlview paragraph">Lithium-ion batteries are ubiquitous in modern energy storage applications, necessitating efficient methods for assessing their state and performance. This study explores a non-destructive approach to extract vital battery parameters using machine learning techniques applied to simulated Electrochemical Impedance Spectroscopy (EIS) data. EIS is a powerful diagnostic tool for batteries and provides a safe and repeatable alternative to the physical intrusion of battery dismantling, which could alter the batteries properties. The research focuses on the design and training of machine learning models for accurate prediction of battery parameters within the widely used P2D model. By leveraging the power of machine learning, this approach aims to accurately characterize the battery parameters using an electrochemical model as opposed to the less accurate equivalent circuit models, contributing to the reliability and longevity of lithium-ion batteries in diverse applications. The second part of this paper incorporates real-life experimental EIS data by utilizing an improved version of an open-source model called “Impedance Analyzer”. Multiple approaches have been explored and discussed to leverage machine learning algorithms to accurately estimate the battery parameters. The findings of this study pave the way for more robust, non-destructive battery assessment methods, crucial for advanced state of health prediction models of lithium-ion batteries.</div></div>

ln this paper, we introduce a new categorization algorithm called RITMO to determime precisely sharing patterns in software distributed shared memory (DSM). RITMO is based on the page sharing state information generated at run-time by a finite state machine (FIESTA). RITMO categorizes dynamically pages according to their inherent sharing patterns in contrast with the induced sharing patterns used in current algorithms. The main advantage of this approach is to enable RITMO to categorize accurately irregular applications in which finegrain memory accesses often mask inherent sharing patterns making categorizations based on induced patterns inexact. Both FIESTA and RITMO are transparent to the programmer and do not require compiler or hardware assistance. Furthermore, they add no extra messages to the protocol and intrusion is kept extremely low. Through detailed execution-driven simulation of six benchmark applications running on TreadMarks with 8 processors we show that RITMO categorization is highly precise on classifying pages that are responsible for more than 93% of the application page faults, as either single-writer or migratory in tive out of six benchmarks. In both irregular applications tested, 50% (in Water-Nsq) and 8% (in Barnes2) of pages which correspond to 26% and 60% of the application page faults respcctively, have induced sharing patterns different from their inherent sharing patterns which were precisely determined by RITMO. Also, our results show that prefetching and forwarding could be efficiently implemented due to the RITMO accuracy, reducing remote data overheads from 14% (in BarnesTmk) up to 90% (in Em3d). As a result, the application execution time improved from 7% (Barnes2) to 38% (Em3d). Our conclusion is that RITMO based on FIESTA is a effcctive technique to improve software DSM performance in a large class of applications.

ABSTRACT Due to highly uncertain nature of unconventional reservoirs and difficult monitoring of the engineering effectiveness, a reliable, accurate, and efficient reservoir model calibration workflow is essential to help operators understand/plan their assets. In this paper, a collection of the non-intrusive EDFM (Embedded Discrete Fracture Model), AI (artificial intelligence), and an unconventional-targeting in-house reservoir simulator URSim is built to perform automatic history matching and uncertainty calibration of hydraulic and natural fractures (abbreviated as EDFM-AI). By implementing the proposed workflow, highly uncertain parameters, such as hydraulic fracture half-length, height, conductivity, closure coefficient, etc. are easily characterized. To validate the robustness of the proposed workflow, especially on the level of simultaneous multi-well calibration, a field-scale shale gas reservoir model is prepared with 3 horizontal wells and 200 hydraulic fractures for each well. Known set of hydraulic fracture parameters are inputted, constant gas flow rates are the well constraints, and the simulation outputs are defined as benchmark data. The history matching results showed high accuracy matches. More importantly, the maximum error between calibrated P50 and true value is only 6.8%. This novel EDFM-AI workflow sheds light on post-frac evaluation and completion optimization in unconventional resources. INTRODUCTION Current unconventional reservoir developments are characterized as fast-paced, real-time, and multi-well (pad-wise drilling). Many operators can drill and completion more than 100 unconventional horizontal wells per year. Under this scenario, it is crucial for operators to understand the effectiveness of hydraulic fracturing. Multitude methodologies/studies have been dedicated to study the man-made hydraulic fractures. These include fracturing simulation models (Wan et al., 2020; Weijermars et al., 2020; Leem et al., 2022), experimental methods (Magsipoc et al., 2020; Wei et al., 2021), and diagnostic technologies (Gutierrez et al., 2010; Ugueto et al., 2021; Wang et al., 2022). However, uncertainties associated with fracture geometries still remain as the most challenging problem in the unconventional oil/gas industry.

Abstract Immiscible Water Alternating Gas (iWAG) scheme was adopted in Echo field, offshore Sarawak Malaysia, to increase recovery factor of the matured oil reservoir after more than two (2) decades of peripheral water injection. It was implemented through four (4) horizontal wells located at reservoir’s eastern and western flanks. Since the commencement of iWAG injection, multiple challenges occured interrupting the stable injection that halting the success of this integrated mega scale project. It started with prolonged iWAG performance test run due to surface constraint, measurement and well issues on executing switching test, followed with low injectivity during switching operation. Subsequently, injectivity issues occured in the gas phase after several injection cycles. In addition to that, injector wells facing high downtime due to surface facilities and well integrity issues, causing low injection rates and unavailability to meet cycle volume within the stipulated duration. Reactivation of iWAG benefiter wells also prove to be challenging due to wells have been idle for a long time and multiple interventions required to revive the well. Injection data for both gas and water phase were analysed to improve iWAG operating procedure and understand the wells performance. INJ-J2 was installed with temporary pressure gauge during the water to gas switching, while the other two (2) wells are equipped with Permanent Downhole Gauge (PDG) to monitor the well injectivity. Application of non-intrusive flowmeter was also proven useful in calibrating the Flow Transmitter (FT) for both water and gas injectors, ensuring the accuracy and precision in the water and gas injection measurement. Besides that, fluid temperature trending was referred to validate on the meter measurement. Low injection rate compared to original plan were reviewed with the Reservoir Management Plan (RMP). Several approaches are implemented in order to achieve the iWAG RMP target and idle well reactivation. Analysis of injection data showed that gas injectivity issue occurred after the water to gas switching cycle. Injectivity improves slightly after long duration of continuous gas injection and applying higher Tubing Head Pressure (THP), unfortunately some wells remain with low injectivity because of insufficient discharge pressure to push the water from the near-wellbore deep into the reservoir to improve injection. Low injection rate issue is mitigated by extending injection cycle duration in order to meet the RMP cycle volume. Besides that, wells are normally injected with higher injection rate to cater for the high downtime. Both gas and water injection are balanced to ensure that the wells reached their cycle volume at similar duration. With limited new field discovery by the Operator, tertiary recovery on the mature field is inevitable. However, there is less implementation of iWAG in offshore field. Through this paper, authors wish to provide insights and lesson learnt for others when planning for iWAG tertiary recovery, taking account of various challenges faced.

Abstract Among the many applications of Coiled Tubing (CT) services, milling plugs and wellbore sand cleanout are two of the major applications. The transport of solids to the surface, as well as monitoring the return rates, are two sources of information which can have a significant impact on the execution of these jobs. Traditionally the flowback crew communicates this information to the CT control cab upon request. However, by utilizing an acoustic monitor and ultrasonic flowmeter, it can reduce the dependence on flowback operators and provide real-time solid measurement and return flow rate. The acoustic monitor is a passive, non-intrusive device that is designed to measure the acoustic noise induced into the pipe wall as solids impact the inside wall of the pipe. The ultrasonic flowmeter is a clamp-on device that is designed with two transducers that serve as both a transmitter and receiver. In order to prove the concept, five stages of trials were planned and executed. In stage one, CT was rigged into a 150m vertical test well. The equipment included CT mast unit, CT pump, choke manifold, and acoustic monitoring device. Several debris piles from previous milling operations were introduced to the test well, and a CT cleanout was performed. The acoustic monitor system measured the amount of solid to surface, and the results were evaluated. Solids retrieved were then compared to the initial debris piles and correlated to the data received by the acoustic monitor. On the 2nd stage, the acoustic monitoring device was utilized in actual milling operation. The 3rd stage was a yard trial of ultrasonic flowmeter using a CT pump and data acquisition system to evaluate the working envelope of this device, followed by a field trial, in stage 4, utilizing the flowmeter in actual milling operations. The final stage of this trial was planned and executed in milling operations on a five wells pad, utilizing the combined applications of acoustic monitoring (solid measurement) and ultrasonic flowmeter (return rate) devices. All five stages contributed to proof of concept for the applications of solid measurement and return flow rate devices. These trials were successfully planned, executed, and evaluated. The acquired data throughout the five stages of these trials were utilized during and post job operations as lessons learned to optimize the process for future applications. The real-time measurement of solids and flow rate monitoring, independent of flowback operators, enables the CT operator to make informed decisions throughout milling and cleanout operations. The real-time streaming of solids to surface and return flow rate enables the operator and service company’s Engineering team to evaluate and optimize the execution of milling and sand cleanout operations.