Academic literature on the topic 'Welded Braid'
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Journal articles on the topic "Welded Braid":
1
Bellingeri, Paolo, and Arthur Soulié. "A note on representations of welded braid groups." Journal of Knot Theory and Its Ramifications 29, no. 12 (October 2020): 2050082. http://dx.doi.org/10.1142/s0218216520500820.
Abstract:
In this paper, we adapt the procedure of the Long-Moody procedure to construct linear representations of welded braid groups. We exhibit the natural setting in this context and compute the first examples of representations we obtain thanks to this method. We take this way also the opportunity to review the few known linear representations of welded braid groups.
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Dey, Soumya, and Krishnendu Gongopadhyay. "Commutator subgroups of welded braid groups." Topology and its Applications 237 (March 2018): 7–20. http://dx.doi.org/10.1016/j.topol.2018.01.003.
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KAUFFMAN, LOUIS H., and SOFIA LAMBROPOULOU. "VIRTUAL BRAIDS AND THE L-MOVE." Journal of Knot Theory and Its Ramifications 15, no. 06 (August 2006): 773–811. http://dx.doi.org/10.1142/s0218216506004750.
Abstract:
In this paper we prove a Markov theorem for virtual braids and for analogs of this structure including flat virtual braids and welded braids. The virtual braid group is the natural companion to the category of virtual knots, just as the Artin braid group is the natural companion to classical knots and links. In this paper we follow L-move methods to prove the Virtual Markov theorems. One benefit of this approach is a fully local algebraic formulation of the theorems in each category.
4
Bardakov, Valeriy G., Yuliya A. Mikhalchishina, and Mikhail V. Neshchadim. "Representations of virtual braids by automorphisms and virtual knot groups." Journal of Knot Theory and Its Ramifications 26, no. 01 (January 2017): 1750003. http://dx.doi.org/10.1142/s0218216517500031.
Abstract:
In the present paper, a new representation of the virtual braid group [Formula: see text] into the automorphism group of free product of the free group and free abelian group is constructed. This representation generalizes the previously constructed ones. The fact that the previously known representations are not faithful for [Formula: see text] is verified. Using representations of [Formula: see text], a virtual link group is defined. Also representations of the welded braid group [Formula: see text] are constructed and the welded link group is defined.
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Bardakov, Valeriy G., Krishnendu Gongopadhyay, and Mikhail V. Neshchadim. "Commutator subgroups of virtual and welded braid groups." International Journal of Algebra and Computation 29, no. 03 (May 2019): 507–33. http://dx.doi.org/10.1142/s0218196719500127.
Abstract:
Let [Formula: see text], respectively [Formula: see text] denote the virtual, respectively welded, braid group on [Formula: see text]-strands. We study their commutator subgroups [Formula: see text] and, [Formula: see text], respectively. We obtain a set of generators and defining relations for these commutator subgroups. In particular, we prove that [Formula: see text] is finitely generated if and only if [Formula: see text], and [Formula: see text] is finitely generated for [Formula: see text]. Also, we prove that [Formula: see text] and for [Formula: see text] the commutator subgroups [Formula: see text] and [Formula: see text] are perfect, i.e. the commutator subgroup is equal to the second commutator subgroup.
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Chterental, Oleg. "Virtual braids and virtual curve diagrams." Journal of Knot Theory and Its Ramifications 24, no. 13 (November 2015): 1541001. http://dx.doi.org/10.1142/s0218216515410011.
Abstract:
There is a well-known injective homomorphism [Formula: see text] from the classical braid group [Formula: see text] into the automorphism group of the free group [Formula: see text], first described by Artin [Theory of Braids, Ann. Math. (2) 48(1) (1947) 101–126]. This homomorphism induces an action of [Formula: see text] on [Formula: see text] that can be recovered by considering the braid group as the mapping class group of [Formula: see text] (an upper half plane with [Formula: see text] punctures) acting naturally on the fundamental group of [Formula: see text]. Kauffman introduced virtual links [Virtual knot theory, European J. Combin. 20 (1999) 663–691] as an extension of the classical notion of a link in [Formula: see text]. There is a corresponding notion of a virtual braid, and the set of virtual braids on [Formula: see text] strands forms a group [Formula: see text]. In this paper, we will generalize the Artin action to virtual braids. We will define a set, [Formula: see text], of “virtual curve diagrams” and define an action of [Formula: see text] on [Formula: see text]. Then, we will show that, as in Artin’s case, the action is faithful. This provides a combinatorial solution to the word problem in [Formula: see text]. In the papers [V. G. Bardakov, Virtual and welded links and their invariants, Siberian Electron. Math. Rep. 21 (2005) 196–199; V. O. Manturov, On recognition of virtual braids, Zap. Nauch. Sem. POMI 299 (2003) 267–286], an extension [Formula: see text] of the Artin homomorphism was introduced, and the question of its injectivity was raised. We find that [Formula: see text] is not injective by exhibiting a non-trivial virtual braid in the kernel when [Formula: see text].
7
Bardakov, Valeriy G., and Paolo Bellingeri. "Groups of virtual and welded links." Journal of Knot Theory and Its Ramifications 23, no. 03 (March 2014): 1450014. http://dx.doi.org/10.1142/s021821651450014x.
Abstract:
We define a new notion of group of virtual and welded links. We use two approaches for defining it: via representations of (generalized) braids by automorphisms of free groups and via Wirtinger-like labeling on virtual and welded diagrams. In the case of virtual links our invariant is stronger than the notion of fundamental group of a virtual link introduced by Kauffman. In the case of welded links our invariant coincides with Kauffman invariant, but using a generalization of Wada representations we provide new families of invariants of welded links.
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BARTHOLOMEW, ANDREW, and ROGER FENN. "BIQUANDLES OF SMALL SIZE AND SOME INVARIANTS OF VIRTUAL AND WELDED KNOTS." Journal of Knot Theory and Its Ramifications 20, no. 07 (July 2011): 943–54. http://dx.doi.org/10.1142/s0218216511009042.
Abstract:
In this paper we give the results of a computer search for biracks of small size and we give various interpretations of these findings. The list includes biquandles, racks and quandles together with new invariants of welded knots and examples of welded knots which are shown to be non-trivial by the new invariants. These can be used to answer various questions concerning virtual and welded knots. As an application we reprove the result that the Burau map from braids to matrices is non-injective and give an example of a non-trivial virtual (welded) knot which cannot be distinguished from the unknot by any linear biquandles.
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KLYMOV, Yulii, and Igor BOYKO. "STRENGTH OF BUTT WELDED BUTT JOINT OF REINFORCEMENT OF CLASS A500C." Building constructions. Theory and Practice, no. 10 (June 27, 2022): 79–93. http://dx.doi.org/10.32347/2522-4182.10.2022.79-93.
Abstract:
The paper presents the results of experimental studies of the strength of the butt welded joint type C1-Кo for thermo-mechanically reinforced reinforcement class A500C.The experimental studies included tensile tests of two series of reinforcement specimens, each of which included reinforcement specimens in the initial state and with a butt contact weld of the C1-Сo type.The first series included fittings Ø12A500C, Ø14A500C, Ø16A500C from steel of the ST3ps brand and Ø18A500C, Ø20A500C, Ø22A500Cfrom steel of the Ст3пс brand. A total of 278 samples of welded joints were tested. The second series included samples of C1-Co welded joints from the rest of the nomenclature of diameters and grades of steel reinforcement class A500C, namely Ø16A500C from steel grade St3ps, Ø20A500C, Ø22A500C from steel grade St3Gps and Ø25A500C, Ø32A500C, Ø32A500C, Ø32A500C.For each of the diameters, 6 samples were tested in the initial state and 6 samples of C1-Co welded joints.It was found that the destruction of the butt contact connection type C1-Co thermomechanically reinforced reinforcement class A500C of all diameters, from 12 to 32 mm, and steel grades, takes placein the zone of thermal impact and is plastic. Experimental data on the strength of the butt contact weld type C1-Кo reinforcement classA500C for the entire range of diameters and grades of steel produced in Ukraine. It is established that the greatest degree of hardening within 19-20% takes place at diameters of armature of 12… 16 mm from steel of the Ст3пс brand, at diameters of armature of 18… 22 mm from steel of the Ст3Гпс brand of marking made 15-17%, and at diameters of 25…32 mm from steel of the 25Г2С brand - 2,
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Darné, Jacques. "Milnor invariants of braids and welded braids up to homotopy." Algebraic & Geometric Topology 24, no. 3 (June 28, 2024): 1277–320. http://dx.doi.org/10.2140/agt.2024.24.1277.
Dissertations / Theses on the topic "Welded Braid":
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Damiani, Céleste. "The topology of loop braid groups : applications and remarkable quotients." Caen, 2016. http://www.theses.fr/2016CAEN2021.
Abstract:
Dans cette thèse nous étudions les groupes de tresses de cercles, nous explorons leurs applications topologiques et certains quotients remarquables. La thèse se compose de quatre parties : - Unification des formalismes pour les groupes de tresses de cercles. Plusieurs formulations ont été utilisées pour les groupes de tresses de cercles en différents domaines ; nous présentons ces interprétations et prouvons leur équivalence. - Une version topologique du théorème de Markov pour les entrelacs de tores ruban. Avec l’interprétation des tresses de cercles comme objets noués dans l’espace de dimension 4, nous présentons une version du Théorème de Markov pour les groupes de tresses de cercles avec clôture dans l’analogue du tore solide dans l’espace de dimension 4. - Invariants d’Alexander pour enchevêtrements ruban et algèbres de circuit. Nous définissons un invariant d’Alexander pour enchevêtrements ruban. De cela nous extrayons une généralisation fonctorielle du polynôme d’Alexander. Cet invariant a une signification topologique profonde, mais n’est pas simplement calculable. Nous établissons une correspondance avec le polynôme d’Alexander en plusieurs variables pour enchevêtrements introduit par Archibald pour résoudre ce problème. - Quotients des groupes de tresses virtuelles. Nous étudions les groupes de tresses de cercles symétriques, et nous en décrivons la structure. Comme conséquence nous montrons que tout entrelacs «fused » admets un représentant comme clôture d’une tresse de cercles symétrique pureIn this these we study loop braid groups, we explore some of their topological applications and some remarquable quotients. The thesis is composed by four parts:- Unifying the different approaches to loop braid groups. Several formulations are being used by researchers working with loop braid groups in different fields; we present these interpretations and prove their equivalence. - A topological version of Markov’s theorem for ribbon torus-links. Using the understanding of the interpretation of loop braids as knotted objects in the 4-dimensional space, we give a topological proof of a version of Markov theorem for loop braids with closure in a solid torus in the 4-dimensional space. - Alexander invariants for ribbon tangles. We define an Alexander invariant on ribbon tangles. From this invariant we extract a functorial generalization of the Alexander polynomial. This invariant has a deep topological meaning, but lacks a simple way of computation. To overcome this problem we establish a correspondence with Archibal’s multivariable Alexander polynomial for tangles. - Quotients of the virtual braid group. We study the groups of unrestricted virtual braids, a family of quotients of the loop braid groups, and describe their structure. As a consequence we show that any fused link admits as a representative the closure of a pure unrestricted virtual braid
2
Graff, Emmanuel. ""Link-homotopy" in low dimensional topology." Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMC244.
Abstract:
Ce mémoire explore la topologie de basse dimension, en mettant l'accent sur la théorie des nœuds. Une théorie consacrée à l'étude des nœuds tels qu'ils sont communément compris : des morceaux de ficelle enroulés dans l'espace ou, de manière plus générale, des entrelacs formés en prenant plusieurs bouts de ficelle. Les nœuds et les entrelacs sont étudiés à déformation près, par exemple, à isotopie près, ce qui implique des manipulations sans couper ni faire passer la ficelle à travers elle-même. Cette thèse explore la link-homotopie, une relation d'équivalence plus souple où des composantes distinctes demeurent séparées, mais où une composante donnée peut s'auto-intersecter. La théorie des claspers, des puissants outils de chirurgie, est développée à link-homotopie près. Leur utilisation permet une démonstration géométrique de la classification des entrelacs avec 4 composantes ou moins à link-homotopie près. Une attention particulière est ensuite accordée aux tresses, des objets mathématiques apparentés aux nœuds et aux entrelacs. Il est montré que le groupe de tresses homotopiques est linéaire, c'est-à-dire isomorphe à un sous-groupe de matrices. De nouvelles présentations de ce groupe sont également proposées. Enfin, il est établi que le groupe de tresse homotopique est sans torsion, quel que soit le nombre de composantes. Ce dernier résultat s'appuie sur le contexte plus large de la théorie des nœuds soudésThis thesis explores low-dimensional topology, with a focus on knot theory. Knot theory is dedicated to the study of knots as commonly understood: a piece of string tied in space or, more generally, links formed by taking several pieces of string. Knots and links are studied up to deformation, for example, up to isotopy, which involves manipulations that do not require cutting or passing the string through itself. This thesis explores link-homotopy, a more flexible equivalence relation where distinct components remain disjoint, but a single component can self-intersect. The theory of claspers, powerful tools of surgery, is developed up to link-homotopy. Their use allows for a geometric proof of the classification of links with 4 components or less up to link-homotopy. Special attention is then given to braids, mathematical objects related to knots and links. It is shown that the homotopy braid group is linear, meaning it is faithfully represented by a subgroup of matrices. New group presentations are also proposed. Finally, it is established that the homotopy braid group is torsion-free for any number of components. This last result draws upon the broader context of welded knot theory
3
Debener, Stefan, André Beauducel, Doreen Nessler, Burkhard Brocke, Hubert Heilemann, and Jürgen Kayser. "Is Resting Anterior EEG Alpha Asymmetry a Trait Marker for Depression?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-134697.
Abstract:
Several lines of evidence suggest that asymmetric anterior brain activation is related to affective style, linking left hemisphere activation to positive affect and right hemisphere activation to negative affect. However, previous reports of left frontal hypoactivation in depressed patients were not confirmed in recent studies. This study evaluated additional characteristics of resting EEG alpha (8–13 Hz) asymmetry in 15 clinically depressed patients and 22 healthy adults by recording EEG activity on two separate occasions, 2–4 weeks apart. Across both sessions, group differences in anterior EEG asymmetry were compatible with the original hypothesis. However, groups differed in temporal stability of anterior EEG asymmetry, which was retest reliable in controls but not depressed patients. In contrast, temporal stability of posterior EEG asymmetry was acceptable in both groups. Increased variability of anterior EEG asymmetry may be a characteristic feature for depression, and, if so, this would challenge the notion that anterior EEG alpha asymmetry is a trait marker for depressionDieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
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Debener, Stefan, André Beauducel, Doreen Nessler, Burkhard Brocke, Hubert Heilemann, and Jürgen Kayser. "Is Resting Anterior EEG Alpha Asymmetry a Trait Marker for Depression?: Findings for Healthy Adults and Clinically Depressed Patients." Karger, 2000. https://tud.qucosa.de/id/qucosa%3A27589.
Abstract:
Several lines of evidence suggest that asymmetric anterior brain activation is related to affective style, linking left hemisphere activation to positive affect and right hemisphere activation to negative affect. However, previous reports of left frontal hypoactivation in depressed patients were not confirmed in recent studies. This study evaluated additional characteristics of resting EEG alpha (8–13 Hz) asymmetry in 15 clinically depressed patients and 22 healthy adults by recording EEG activity on two separate occasions, 2–4 weeks apart. Across both sessions, group differences in anterior EEG asymmetry were compatible with the original hypothesis. However, groups differed in temporal stability of anterior EEG asymmetry, which was retest reliable in controls but not depressed patients. In contrast, temporal stability of posterior EEG asymmetry was acceptable in both groups. Increased variability of anterior EEG asymmetry may be a characteristic feature for depression, and, if so, this would challenge the notion that anterior EEG alpha asymmetry is a trait marker for depression.Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Couto, Filipa Ribeiro do. "Lançamento de uma nova marca: Natur Troofs: Projeto Trofal S.A." Master's thesis, 2016. http://hdl.handle.net/10071/17596.
Abstract:
A presente Tese de Mestrado é um projeto-empresa feito em colaboração com a Trofal,
fábrica de calçado S.A., que se encontra a enfrentar alguns desafios face ao mercado altamente
competitivo, complexo e com um elevado grau de incerteza, de modo que pretende lançar uma
nova marca.
Considera-se que a criação de uma nova marca poderá ser uma mais-valia, no sentido
de juntar uma vantagem competitiva sustentável a uma empresa com um know-how distinto e
detentora de equipamentos especializados.
A criação de uma marca é a fase final de um longo processo. Implica e focaliza os
recursos da empresa, com o objetivo estratégico de criar a diferença. A marca tem o papel
fundamental de diferenciar a empresa dos seus concorrentes, de agrupar todos os seus
conhecimentos internos e desenvolver um produto/ serviço que trará valor acrescentado. Uma
marca deverá ser diferenciadora, logo única.
Após identificado o problema, foi realizada uma revisão de literatura e várias análises
(mediata, imediata e interna). Após estas análises procedeu-se à elaboração de um conjunto de
propostas de orientações estratégicas de aplicação a médio prazo.This master thesis consists on a project made in collaboration with Trofal, a shoe manufacturing company which is facing many challenges due to the highly competitive market. The objective of the present work is to launch a new brand. The creation of a new brand with a sustainable competitive advantage, associated to a company with a distinctive know-how and specialized equipments, will bring considerable value to the market. This creation represents the final step of a long process that evolves the company resources with strategic goal of making a difference. A brand should be distinguished from their competitors, put internal knowledge together to develop a product or service which will make the difference, which will be unique. After identifying and characterizing the study subject analysis issue, a literature review was made and after that three analysis - the mediate, immediate and internal. As a conclusion resulted an action plan with specific guide lines, strategic oriented, to apply in the near future.
Books on the topic "Welded Braid":
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Plastics in Automotive Engineering 2016. VDI Verlag, 2016. http://dx.doi.org/10.51202/9783182443438.
Abstract:
The lightness of design Lines and curves make the pavilion a dynamic and trimmed sculpture whose characteristics derive from the brand image of the vehicle manufacturer. Uniform, matt stainless steel sheets wrap the body shell seamlessly. In a similar way to monocoque design, which is used in lightweight construction in the automotive and aircraft industries, the space-creating shell of the building takes over the load-bearing function. A total of 620 stainless steel covering sheets with welded-on stiffening ribs were prefabricated in a shipyard in Stralsund and assembled on site Table of contents conference proceedings 5 Anspruchsvolle Oberflächen und Leichtbau in der Instrumententafel des neuen Volkswagen Tiguan Mielke, R. / Dierks, P. | 201 19 3D Simulation für den Leichtbau in der kunststoffverarbeitenden Industrie Kurz, M. | 2016 31 Neuartige PUR-Oberflächen. Selbstheilend und mehr Kleba, I. / Emig, J. | 2016 47 Mono-polymer lift-gate solution cuts CO2 emissions Liraut, ...
Book chapters on the topic "Welded Braid":
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Maurer, Konrad, T. Dierks, and G. Carl. "Elektrisches Brain Mapping (EBM): Topographische Darstellung der kognitiven Welle P300 bei Schizophrenie." In Biologische Psychiatrie, 327–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-72922-5_76.
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Huff, Anne S. "Managerial And Organizational Cognition Islands Of Coherence." In Great Minds in Management, 331–54. Oxford University PressOxford, 2005. http://dx.doi.org/10.1093/oso/9780199276813.003.0016.
Abstract:
Abstract Cognition is important. Attempts to understand it are rooted most deeply in psychology, a Weld that takes a major share of the behavioural science pie in most universities, often larger than the other main contenders: sociology and economics. As cognition became a subject of its own in the 1970s and 1980s, it was strongly shaped by the sub Weld of social psychology, but also by computer and information science, along with many other Welds. It was a ‘‘golden era’’ of argument within an arena that all agreed had enormous potential. Part of the assurance of those working in the emerging discipline came from rapid developments in computer science, and the assumption that the human brain functioned in the way a computer (of that time) functioned.
3
Wonham, Henry B. "The Emergence of Tall Narrative in American Writing." In Mark Twain and the Art of the Tall Tale, 17–50. Oxford University PressNew York, NY, 1993. http://dx.doi.org/10.1093/oso/9780195078015.003.0002.
Abstract:
Abstract Benjamin Franklin may have been among the first patriots to challenge foreign readers with an example of tall humor, yet by the end of the eighteenth century Americans were already notorious for their seemingly irrational and depraved love of exaggeration, and no account of travel through the western and southern settlements was complete without some anecdote intended to illustrate this idiosyncrasy of the national character. Some of the more credulous early visitors to America inadvertently provided evidence of the nation’s passion for yarn spinning by including information gleaned from native sources in their notes on the geography, history, institutions, and people of the new country. Travelling across western Maryland and Virginia shortly after the Revolution, for example, Isaac Weld witnessed several typical narrative performances by settlers who must have detected in Weld’s harsh opinion of American culture an opportunity to practice their own peculiar brand of satire. The gentleman writes that he encountered “four or five” invalids whose testicles- so he was told- had been torn off in combat with barbarous neighbors. Deaf to the laughter his hosts must have been sharing behind his back, Weld goes on to report: “I have been credibly assured that [in the Carolinas and Georgia] the people are still more depraved … and that in some particular parts of these states, every third or fourth man appears with one eye.”
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Bornkessel-Schlesewsky, Ina, and Matthias Schlesewsky. "Introduction." In Processing Syntax and Morphology: A Neurocognitive Perspective, 1–2. Oxford University PressOxford, 2009. http://dx.doi.org/10.1093/oso/9780199207817.003.0001.
Abstract:
Abstract The last ten years of the twentieth century might well be considered the ‘‘decade of the brain’’. With the advent of neuroimaging methods, and particularly of functional magnetic resonance imaging (fMRI), the Weld of cognitive neuroscience thrived. The study of language posed no exception to this general development: in addition to providing a vehicle for more general goals in neuroscientific research, language soon became one of the major domains of neurocognitive investigation in its own right. On the one hand, the methodological advances suddenly offered a completely new perspective on the tradition of linking language-related functions with particular brain regions, a correlation which has intrigued scientists and non-scientists alike for at least two thousand years.
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Maher, Barbara A. "Airborne Magnetite- and Iron-Rich Pollution Nanoparticles: Potential Neurotoxicants and Environmental Risk Factors for Neurodegenerative Disease, Including Alzheimer’s Disease." In Advances in Alzheimer’s Disease. IOS Press, 2021. http://dx.doi.org/10.3233/aiad210006.
Abstract:
Fewer than 5% of Alzheimer’s disease (AD) cases are demonstrably directly inherited, indicating that environmental factors may be important in initiating and/or promoting the disease. Excess iron is toxic to cells; iron overload in the AD brain may aggressively accelerate AD. Magnetite nanoparticles, capable of catalyzing formation of reactive oxygen species, occur in AD plaques and tangles; they are thought to form in situ, from pathological iron dysfunction. A recent study has identified in frontal cortex samples the abundant presence of magnetite nanoparticles consistent with high-temperature formation; identifying therefore their external, not internal source. These magnetite particles range from ∼10 to 150 nm in size, and are often associated with other, non-endogenous metals (including platinum, cadmium, cerium). Some display rounded crystal morphologies and fused surface textures, reflecting cooling and crystallization from an initially heated, iron-bearing source material. Precisely-matching magnetite ‘nanospheres’ occur abundantly in roadside air pollution, arising from vehicle combustion and, especially, frictional brake-wear. Airborne magnetite pollution particles <∼200 nm in size can access the brain directly via the olfactory and/or trigeminal nerves, bypassing the blood-brain barrier. Given their toxicity, abundance in roadside air, and nanoscale dimensions, traffic-derived magnetite pollution nanoparticles may constitute a chronic and pernicious neurotoxicant, and hence an environmental risk factor for AD, for large population numbers globally. Olfactory nerve damage displays strong association with AD development. Reported links between AD and occupational magnetic fields (e.g., affecting welders, machinists) may instead reflect inhalation exposure to airborne magnetic nanoparticles.
6
Wilson, Sondra Kathryn. "Communism and the Negro." In The Selected Writings of James Weldon Johnson, 180–88. Oxford University PressNew York, NY, 1995. http://dx.doi.org/10.1093/oso/9780195076455.003.0024.
Abstract:
Abstract The launching of the New Deal was followed by high hopes for a new day and these high hopes were based on a new faith of the American people, faith in the ability of the brain trust by means of mathematical formulae and with mathematical formulae and with mathematical certainty, quickly to exit the depression and bring in an era of prosperity of a new kind. It appears that the country is gradually rising out of the depression. But it also appears that there is an increasing realization that economic formulas do not work out infallibly when applied to human affairs. And this means that the United States is discovering what certain European countries learned some time ago that economics is an important branch of learning but is not an exact science. Contrary to the rather widespread notion, there are no laws in the realm of economics that are fixed and inevitable as are, say, the laws of physics or chemistry. The chemist knows that a combination of certain chemical elements in certain proportions will produce a certain reaction, and he will wager his life on the result, wager that he will get the same reaction not only once but every time the experiment is made. When an economist is confronted with a combination of human elements he is subjected to definite limitations in predicting what the reaction will be; even when he has as a precedent what looks like an identical combination. The plain reason is that in these combinations of human elements the variable and unknown quantities are next to infinite and defy the fomulation of laws that will positively govern or foretell the course of affairs.
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Hawley, John Stratton. "The Pangs and Politics of Love." In The Memory of Love, 79–105. Oxford University PressNew York, NY, 2009. http://dx.doi.org/10.1093/oso/9780195373981.003.0003.
Abstract:
Abstract Rādhā is lost to the onslaught of love. She weeps from tree to tree and finally succumbs, searching through the forests and groves. Her braid—a peacock grasps it, taking it for a snake; her lotus feet attract the bees; Her voice with its honey makes the crow in the kadamb tree think her a cuckoo, and caw her away; Her hands—the tender leaves of blossom-bringing spring: thinking so, parrots come to peck; And thinking her face to be the moon on a full-moon night, the cakor bird drinks the water from her eyes. Desperate at thinking perhaps she’d been dismembered, the Joy of the Yadus appears in the nick of time: Sūrdās’s Lord takes that seedbud of new birth and cradles it, a newborn in his arms. See how Hari has arranged his circle dance— Who has ever heard, ever seen such a thing?IWhere has this taste been secreted away? First he conjured up a fine magic spell and spread it everywhere— no one was spared. Then with one fine shot of an arrow he struck everything that moves or does not move. Who knows the recipe for such love? Seeing his eyes’ aesthetics, tasting the lilt of his voice, a welter of murmurs rippled through the army Of Kāma, says Sūr, who could not control his bow. He turned his hands palm-up, that Bodiless One, and then began to dance.
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McGaugh, James L., and Larry Cahill. "Emotion and Memory: Central and Peripheral Contributions." In Handbook of Affective Sciences, 93–116. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780195126013.003.0006.
Abstract:
Abstract Every moment of our lives new information inundates our brains. Some of the information is preserved, perhaps for a lifetime. It has long been noted that memories of emotionally arousing experiences endure vividly (James, 1890; Christianson, 1992). We have enduring memories of significant personal experiences such as birthdays, weddings, holiday celebrations, the births of children, and the deaths of loved ones. We also tend to remember where we were and what we were doing when we witnessed a serious accident (Stratton, 1919; Bohannon, 1988), learned highly surprising and important information (Conway et al., 1994), or experienced an earthquake (Neisser, Winograd, Shreiber, Palmer, & Weldon, 1996). More common emotional experiences induced by praise, embarrassment, and insults are also not quickly forgotten. Emotional arousal thus appears to play a central and highly adaptive role in enabling the significance of events to influence the strength of the memories of events (McGaugh, 1992, 2000; Cahill & McGaugh, 1998). As William James commented, “An experience may be so exciting emotionally as to almost leave a scar on the cerebral tissue” (1890, p. 670). This chapter reviews research investigating the neurobiological systems involved in creating such “scars on the cerebral tissue.” The research is guided by the general hypothesis that emotional experiences activate processes that continue for some time after the experience and that those processes play critical roles in creating lasting memory. As noted by George Stratton, “When fear is relieved by the sudden disappearance of a menace, as when one has killed a rattlesnake faced suddenly in the mountains, there is no instant calm. The alarm is gone, but the waters continue to be troubled as after a squall” (1928, p. 220). Livingston (1967) was the first, to our knowledge, to offer a general neurobiological hypothesis to account for the effects of emotional arousal on memory. He suggested that activation of specific brain systems might promote the storage of recently activated brain events by initiating a “neurohormonal influence (favoring) future repetitions of the same neural activities” (p. 576). Kety (1972) subsequently offered a similar yet more specific suggestion that adrenergic catecholamines released in emotional states may serve “to reinforce and consolidate new and significant sensory patterns in the neocortex” (p. 73). In support of those hypotheses there is now extensive evidence indicating that stress hormones released by emotional stimulation modulate memory consolidation and that stress hormones act, at least in part, by activating brain systems that modulate memory consolidation.
Conference papers on the topic "Welded Braid":
1
Yeh, Chien-Lin, Eric J. Ward, Ruoyun Ma, Sandy Snyder, Tobias Schmidt-Wilcke, and Ulrike Dydak. "P125 Whole-brain r1 mapping of manganese in welders - visualisation of increased mn levels in the brain." In Occupational Health: Think Globally, Act Locally, EPICOH 2016, September 4–7, 2016, Barcelona, Spain. BMJ Publishing Group Ltd, 2016. http://dx.doi.org/10.1136/oemed-2016-103951.442.
2
Hofmann, Allan, Armando Albertazzi, Joa˜o Castilho Santos, Eduardo Valim, Ricardo Gondo, and Thiago Freitas. "A Stereoscopic Endoscopic Optical System for Measurement of the 3D Weld Geometry of Pipes: Concepts and Preliminary Results." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92028.
Abstract:
Steel catenary risers (SCRs) have been considered a strong candidate in future sub sea developments at Campos Basin (Brazil). So there is an enormous effort to guarantee the structural integrity along its lifetime. In this context, inspection activities become significantly important in the manufacturing process. The welding is considered a critical process so it is the inspection focus. Studies and analysis have demonstrated that fatigue performance of one sided girth weld is considered a critical issue, mainly in the touch down point (TDP) area. In this context, control the girth weld misalignment would improve fatigue performance during fabrication. This paper presents an optical system developed to inspect the root region of the weld during fabrication. A pair of stereoscopic images is obtained when two images of the same scene are taken from slightly different viewing angles. Both images can be combined to give information about the 3D nature of the scene. This is naturally done by the brain of most animals and humans. It is also already a very well established computer vision technique to extract 3D information from objects. The authors developed an alternative endoscopic configuration to extract and analyze stereoscopic images from the inside of pipes is presented. Two cameras are coupled with conical optics to produce a pair of endoscopic stereoscopic images of a 360° measurement ring. A light projector is used to illuminate the inner surface and, alternatively, to generate a random pattern of dots that is projected into the inner surface of a pipe to make it easier to correlate the images. Both images are analyzed by cross-correlation technique. The corresponding position of the spots in each image are found and combined to compute the 3D coordinates of points laying on the inner surface of the pipe. As a result, a dense cloud of points of the inner surface is obtained and used to extract geometrical features of the pipe. The software is capable to represent the measured surface from different angles and through different cuts. A prototype using this principle was built and tested in laboratory. Some practical considerations and early measurement results are here presented. The aim is to measure and quantify the misalignment between the pipes and to detect common welding defects like lack and excess of penetration.