132 research outputs found
Syndromic scoliosis in a patient with arthrochalasia Ehlers-Danlos syndrome corrected with a Wood-Rigo-Cheneau derotational brace.
No full textWe present a boy in middle childhood with a medical history of arthrochalasiaEhlers-Danlos syndrome who was diagnosed with scoliosis as a toddler. His treatment began at a regional children\u27s hospital, where initial spine radiographs demonstrated a 43.6° dextroscoliosis curve with the apex at L3. He was initially treated with a Boston brace, and the family was informed that MAGEC (Magnetic Expansion Control) growing rods were likely the definitive treatment due to the high likelihood of progression given the patient\u27s large Cobb angle. However, the decision was made by the family and the Ehlers-Danlos syndrome specialist to proceed with the Wood-Rigo-Cheneau derotational brace
A M. Lacordaire. Réflexions sur les théologiens futiles et égarés. (Signé : Cheneau, C. [3 janvier 1844.])
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Optimal control of complex atomic quantum systems
Get PDFQuantum technologies will ultimately require manipulating many-body quantum systems with high precision. Cold atom experiments represent a stepping stone in that direction: a high degree of control has been achieved on systems of increasing complexity. However, this control is still sub-optimal. In many scenarios, achieving a fast transformation is crucial to fight against decoherence and imperfection effects. Optimal control theory is believed to be the ideal candidate to bridge the gap between early stage proof-of-principle demonstrations and experimental protocols suitable for practical applications. Indeed, it can engineer protocols at the quantum speed limit-the fastest achievable timescale of the transformation. Here, we demonstrate such potential by computing theoretically and verifying experimentally the optimal transformations in two very different interacting systems: the coherent manipulation of motional states of an atomic Bose-Einstein condensate and the crossing of a quantum phase transition in small systems of cold atoms in optical lattices. We also show that such processes are robust with respect to perturbations, including temperature and atom number fluctuations
Optimal control of complex atomic quantum systems
No full textQuantum technologies will ultimately require manipulating many-body quantum systems with high precision. Cold atom experiments represent a stepping stone in that direction: a high degree of control has been achieved on systems of increasing complexity. However, this control is still sub-optimal. In many scenarios, achieving a fast transformation is crucial to fight against decoherence and imperfection effects. Optimal control theory is believed to be the ideal candidate to bridge the gap between early stage proof-of-principle demonstrations and experimental protocols suitable for practical applications. Indeed, it can engineer protocols at the quantum speed limit-the fastest achievable timescale of the transformation. Here, we demonstrate such potential by computing theoretically and verifying experimentally the optimal transformations in two very different interacting systems: the coherent manipulation of motional states of an atomic Bose-Einstein condensate and the crossing of a quantum phase transition in small systems of cold atoms in optical lattices. We also show that such processes are robust with respect to perturbations, including temperature and atom number fluctuations
Massive Goldstone (Higgs) mode in two-dimensional ultracold atomic lattice systems
Get PDFWe discuss how to reveal the massive Goldstone mode, often referred to as the Higgs amplitude mode, near the superfluid-to-insulator quantum critical point (QCP) in a system of two-dimensional ultracold bosonic atoms in optical lattices. The spectral function of the amplitude response is obtained by analytic continuation of the kinetic energy correlation function calculated by Monte Carlo methods. Our results enable a direct comparison with the recent experiment [M. Endres, T. Fukuhara, D. Pekker, M. Cheneau, P. Schauß, C. Gross, E. Demler, S. Kuhr, and I. Bloch, Nature (London) 487, 454 (2012)] and demonstrate a good agreement for temperature shifts induced by lattice modulation. Based on our numerical analysis, we formulate the necessary conditions in terms of homogeneity, detuning from the QCP and temperature in order to reveal the massive Goldstone resonance peak in spectral functions experimentally. We also propose to apply a local modulation at the trap center to overcome the inhomogeneous broadening caused by the parabolic trap confinement
Armorial vniuersel, contenant les armes des principales maisons, estatz, et dignitez, des plus considerables royaumes de l'Europe. Blazonnées de leurs métaux & couleurs et enrichies de leurs ornemens exterieurs.
No full text56, 83, 92, 135 repeated in foliation, 82 repeated twice. Plate 114' with dedication appears as well as plate 114. Plate 138 misnumbered 137, 180 numbered 80.Most plates signed by Pierre Nolin. Last plate by Nolin after Henry Heneau (or Cheneau) is imaginary arms for "L'empire de la Mort."Special added t.p. on plate 14.Engraved throughout, except for letterpress ordinary of arms and index of surnames (p. [9]-[20]).Mode of access: Internet.Clifford Duits's embossed label on front free endpaper recto.Binding: 19th-century patterned goatskin. Spine gold tooled with fleurs de lys, title in gilt on red label. Edges marbled. Previously stab sewn.Getty copy lacks leaves 32 & 96. Second plate numbered 137 and plate 139 bound upside down. Lower third of sinister shield, plate 140, and one charge on 2nd shield of plate C have been excised. Plate 114' bound before plate 141
Boston versus Cheneau brace - Does the type of brace influence physical therapy in idiopathic scoliosis?
No full textKontext/Ziel/Fragestellung: Die vorliegende Arbeit beschäftig sich mit der konservativen Behandlung der idiopathischen Skoliose. Es werden zwei verschiedene Korsette beschrieben und gegenübergestellt, und mit Maßnahmen aus der Physiotherapie jeweils gemeinsam kombiniert. Das Ziel dieser Arbeit stellt die Beantwortung folgender Fragestellung dar: „Welche Unterschiede ergeben sich auf Grund der Korsettversorgung (Chêneau versus Boston) in der Physiotherapie hinsichtlich der Gewichtung der Therapieziele und der Auswahl der Maßnahmen?“
Methodik: Bei dieser Bachelorarbeit handelt es sich um eine nicht-empirische Forschungsarbeit. Zur Aufarbeitung der Thematik wurde Basiswissen aus Fachbüchern aus der Bibliothek FH Campus Wien verwendet. Des Weiteren wurden Datenbanken wie PubMed, Pedro und Google Scholar nach passenden Studien durchforstet.
Hauptergebnisse: Die zentrale Fragestellung konnte anhand der gefundenen Studien nicht eindeutig beantwortet werden, weil die Studien zu wenig auf die Physiotherapie eingehen und keine konkreten Ausführungen über Ziele und Maßnahmen in der Physiotherapie vornehmen. Dennoch wurden Anregungen für Ziele und Maßnahmen in der Physiotherapie durch die Autorin dieser Arbeit gefunden, die sich im Interpretationskapitel befinden.
Schlussfolgerung: Weitere wissenschaftliche Studien sind notwendig, um die Wirkungsweise der genannten Korsette und die Maßnahmen in der Physiotherapie beweisen zu können. Zusätzlich wären Studien sinnvoll, die ein bestimmtes Korsett mit einer bestimmten physiotherapeutischen Maßnahme, vor allem die genaue Durchführung der Übung, beschreiben würden.Context/Objective/Question: This bachelor thesis discusses the conservative treatment of idiopathic scoliosis. Two different braces are mentioned and compared to each other in order to connect the purpose of a certain type of brace with the aim and method of physical therapy. The aim of this bachelor thesis is to answer the following question: “Are the aim and the method in physical therapy different if varying types of braces (Chêneau versus Boston brace) are use?”
Method: This bachelor thesis is a non empiric research study. For the basic knowledge books from the library of The University of Applied Sciences, FH Campus Wien were consulted. In addition, online databases such as: PubMed, Pedro and Google Scholar were searched for suitable studies.
Mainresults: Because of these studies, there is no definitive answer of the main question possible. The studies were not responsive to physical therapy and don’t mention the aim and the physical activities. The author of this bachelor thesis mentions aims and physical activities in the interpretation chapter, which are meaningful for idiopathic scoliosis.
Conclusion: Further studies with a long term follow up are necessary in order to assess the effectiveness of different conservative methods in treating idiopathic scoliosis. Unfortunately, there is only a limited amount of studies currently available which describe the execution of the physical exercises
Evaluación de las propiedades mecánicas y del espesor de capa endurecida en un acero AISI 8620 sometido a tratamiento termoquímico con cáscara de arroz
No full textEn el presente trabajo se realizó el endurecimiento superficial de un acero AISI 8620 mediante el proceso termoquímico llamado cementación sólida, el cual, consiste en difundir átomos de Carbono a los intersticios de la matriz ferrítica. Como aportante de Carbono usamos cáscara de arroz y como activador el bicarbonato de sodio que cumple la función de iniciador de las reacciones químicas para que se pueda cumplir la difusión. Para este propósito utilizamos 11 probetas, las cuales fueron introducidas una a una en recipientes herméticos de acero de 4 pulgadas de diámetro por 10 cm de alto, junto con una mezcla de cáscara de arroz y bicarbonato de sodio, para luego ser sellados con arena silícea mezclada con silicato de sodio y barbotina con tapas a presión, y ser introducidos a un horno eléctrico variando las temperaturas entre 930, 945 y 960°C para cada prueba según la matriz de diseño factorial 23. Después se les aplicó temple a 850°C durante 40 minutos y enfriamos en un medio acuoso a temperatura ambiente. Como parte de la caracterización, utilizamos un microscopio estereográfico para analizar las microestructuras, se midió el grosor de la capa cementada, se realizó un ensayo de dureza utilizando la escala Rockwell C y de tenacidad usando la máquina de Charpy. Como resultados logramos capas cementadas de 0.8 mm en promedio, las durezas oscilan entre 65-67 HRC; con la evaluación metalográfica se observó principalmente martensita siendo su característica principal la alta dureza y en cuanto al ensayo de tenacidad alcanzamos valores entre los 10 a 14 Joules, que comparándolos con la tenacidad de la muestra sin tratamiento se evidencia una reducción de 125 Joules, lo que nos indica que nuestro núcleo sigue blando, es decir, absorbe energía evitando la rotura de la pieza. Nuestros resultados demuestran que si es posible obtener un muy buen recubrimiento duro sobre el AISI 8620 utilizando cáscara de arroz. Con esta investigación pretendemos darle valor a la cáscara de arroz, considerada como un desecho agroindustrial y que se encuentra en abundancia, utilizándola dentro del proceso de cementación sólida.Tesi
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