Thèses sur le sujet « Pulsatoria »
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CASATI, ANNA. « LA PRESSIONE PULSATORIA NELLA POPOLAZIONE GENERALE : STUDIO DELLA DISTRIBUZIONE DELLA VARIABILE, DELLA SUA CORRELAZIONE CON I FATTORI DI RISCHIO CARDIOVASCOLARE E SUO IMPATTO PROGNOSTICO A LUNGO TERMINE ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/180697.
Texte intégralBackground: pulse pressure (PP) calculated as the difference between systolic and diastolic blood pressure, represents dynamic component of arterial blood pressure. Some studies have focused on pulsation component of blood pressure, assessing the association between PP and occurrence of cardiovascular (CV) events. However, most of these studies were performed on selected populations based on several clinical parameters. Aim: the aim of this study was to investigate whether PP is associated with major adverse cardiovascular outcome and total mortality in a sample of subjects representative of general population in Northern Italy - Brianza area. Secondary endpoints of the study were assessing the impact of PP on developing new hypertrophy and new hypertension. Methods and results: A cohort of 3200 subjects were randomly selected from the general population of Monza (Italy) aged 25 to 74 years, stratified for sex and decades of age. The percentage of participation was 64%. Each subject underwent medical history, especially in relation to cardiovascular risk factors; office, home and 24-hour ambulatory blood pressure measurement. Anthropometric variables like weight height and BMI, serum cholesterol, blood glucose and echocardiographic parameters were also measured. Cut points for left ventricular hypertrophy were derived from current echocardiographic guidelines. Repetition of all measurements after 10 years allowed to evaluate also the risk of developing of office and out-of-office hypertension and echocardiographic left ventricular hypertrophy. CV events and all-cause mortality were evaluated over a mean follow-up of 12 years. The average age of the cohort was 50.9 and 50.5% were men. After adjusting for age, sex and corresponding mean pressure, Office PP, 24 hours, daytime and nighttime PP are associated with the incidence of CV events but not to total mortality. After more extensive adjustment for cholesterol, blood glucose, BMI, previous event cardiovascular, drugs for hypertension and smoking, remains the predictive value of Office PP, 24 hours and daytime PP. None of the measurements of PP was found to be predictive of the development of left ventricular hypertrophy and of arterial hypertension except Home PP that was marginally significant with respect to the onset of hypertension. Conclusion: The results of our study show that the PP based on clinical and 24-h ambulatory measurement is significantly correlated to risk of CV events.
Suard, Sylvain. « Propagation pulsatoire des flammes de brouillard ». Laboratoire de modélisation et simulation numérique en mécanique et génie des procédés (Marseille), 2004. http://www.theses.fr/2004AIX22100.
Texte intégralGiuliani, Fabrice. « Étude du comportement d'un système d'injection de turbomachine en régime pulsatoire forcé ». Toulouse, ENSAE, 2002. http://www.theses.fr/2002ESAE0007.
Texte intégralAndriamihafy, Herison. « Débitmétrie par diaphragme en écoulement pulsatoire sources d'erreurs et corrections, approche expérimentale et modélisation ». Grenoble : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb375937341.
Texte intégralAndriamihafy, Hérison. « Débitmétrie par diaphragme en écoulement pulsatoire : sources d'erreurs et corrections possibles, approche expérimentale et modélisation ». Toulouse, ENSAE, 1987. http://www.theses.fr/1987ESAE0014.
Texte intégralGuingand, Frédéric. « Etude des phénomènes hydro-acoustiques liés au régime pulsatoire du circuit haute pression d'une direction assistée hydraulique ». Lyon, INSA, 2000. http://www.theses.fr/2000ISAL0024.
Texte intégralThe interaction of the pulsated flow generated by the pump with the power-assisted steering circuit produces pressure ripples (fluid born noise) which are transmitted to the circuit and supporting structures (structure born noise), leading to airborne noise in the passenger car. Currently, the "tuning" of this type of system, exclusively experimental and iterative, is expensive in means and time. The methodology developed in this study makes it possible to direct the design of the circuits, to facilitate the experimental development, to install a process based on numerical simulation which opens the way to predictive vibroacoustic design. It is a linear approach covering the range of frequencies going from 100 to 3000 Hz. It relies on the "impedance method": each component is represented b linear relations between Fourier transform of the pressure and flow variables 011 the connection interfaces. The response of the system is then determined by assembly of the characteristics of the various components. Those are first obtained experimentally; what required the development of a characterization technique and suitable test facilities. The constitution of a library of components allows the simulation of new circuits whereas the analysis of the characteristics of various components makes it possible to determine their intrinsic performances and thus to direct the choice of the designer. In the second time, knowledge models are established and correlated with the experimentation. The parameter setting of these models (by the geometry) gives the opportunity to seek an optimization of the circuit according to attenuation criteria defined on target ranges of frequencies. The methodology was applied to a real system and the simulation results were confronted with in situ measurements
Ben, Abdessalem Khaled. « Etude de l'écoulement pulsatile d'un fluide visqueux dans un milieu viscoélastique non linéaire et présentant deux sites de réflexion : application à l'écoulement du sang dans les artères ». Paris 7, 2008. http://www.theses.fr/2008PA077212.
Texte intégralThe knowledge of hemodynamic quantities of the cardiovascular System in relation to pathological or physiological data h£ been the subject of much research in recent decades. The aim of this thesis was to study the possibility of non-intrusive investigation of the arterial System, which is based on the use of ultrasound measurement. We have developed seven methods for non-invasive quantification of hemodynamic quantities of clinical interest. We presented in a first time a method for determining the propagation coefficient, based on simultaneous measurement of the velocity or radius into three section of an arterial trunk. In a second time, we presented a new method of measuring this quantity, based on non-invasive measurement of the velocity and radius at only two sections of a tube or an arterial tree. These methods have been validate by numerical simulation for various geometrical and physical conditions in the presence of noise. In the second part of the work, we developed a method that allows estimation of wave speed through the measurement of velocity and the section in single site. The results of experiments on hydrodynamics banc were compared with classic models of literature. We the presented two methods for the assessment of the distance from the reflection site. Finally we have developed a model the takes into account the presence of two reflections sites. The model allows Computing the flow, the unsteady pressure and the impedance
Bokov, Plamen. « Description expérimentale et numérique de l'interaction entre un stent biodégradable et la paroi artérielle ». Paris 7, 2011. http://www.theses.fr/2011PA077109.
Texte intégralWe have addressed the interaction between a biodegradable coronary stent and the arterial wall using experimental methods and a 3D numerical simplified model based on an equivalent pressure hypothesis. Two types of stents are investigated numerically: a PLLA-PTT stent (poly-L-lactic acid and polytrimethylene terephtalate copolymer) and a stainless steel stent. Three dimensional finite element simulations of the opening mechanics permitted to establish that a post-angioplastic dilatation of 7% is possible by using biodegradable stents. On the other hand, we show experimentally that the radial strength of biodegradable stents in PLLA is comparable to that of stainless steel stents. An important part of this work is devoted to the characterization of hemodynamical incidence of the stent and the pressure pulse reflection when a two dimensional axisymmetric geometrical configuration of the stent-artery System is considered. The stent is either represented as a local hardening of the arterial wall or as a geometrical protrusion in the arterial lumen. The impact on the spatial and temporal distribution of the shear rate at the wall is examined in detail and it is shown that the presence of the stent significantly disturbs the constraints near the site of stenting. This effect is extended a few centimeters upstream and downstream of the stented area. The detailed analysis of perturbations of the parietal viscous stress is a critical factor predicting the major risks of restenosis
De, Assis Peralta Raphaël. « Caractériser les populations stellaires à l'aide d'indices sismiques ». Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066106/document.
Texte intégralLike terrestrial seismology, asteroseismology is the study of star quakes. These internal vibrations are detected by observing the luminosity (or velocity) variations at the stellar surfaces. From these time series, one computes power spectra which contain a wealth of information. In particular, for solar-like pulsators, we are able to observe the signal of granulation as well as the eigenmodes of stellar oscillations, both of which are a direct consequence of the convection in the star's envelope. Asteroseismology allows us to probe the interior of stars much like an ultrasound. Furthermore, with the large spatial photometric surveys CoRoT and Kepler, a new scope for seismology appeared. Indeed, it is possible to characterise to first order the oscillation spectra of solar-like pulsators with few indices or parameters, called seismic indices. Using simple relations, they allow us to estimate fundamental parameters of these stars. Asteroseismology is by consequence a very powerful tool for the study of stellar populations.In the perspective of the development of the Stellar Seismic Indices (SSI - The opening of the SSI database is planned for the summer of 2016, see http://ssi.lesia.obspm.fr/).) database, the purpose of my thesis was to develop an automatic method able to extract simultaneously the seismic indices and the parameters characterizing the granulation signature of solar-like pulsators. This method, called MLEUP, was optimized for red giants because for the few hundred main-sequence solar-like pulsators observed by CoRoT and Kepler, several tens of thousands of red giants have been observed by these same missions. MLEUP has a major advantage over most existing methods: it relies on the use red-giant stellar oscillation universal pattern (UP) to fit the oscillation spectra. This allows us to analyse the unsmoothed spectrum and fit simultaneously both granulation and oscillations with the maximum likelihood estimate (MLE).As a first step, MLEUP was tested on Monte Carlo simulations in order to quantify its performances. These simulations have revealed that MLEUP achieves very good performances, with low biases and dispersions. As a second step, we applied MLEUP to more than 36,500 stars observed by CoRoT and Kepler, thereby yielding seismic indices and granulation parameters for more than 13,500 stars. Those results have already been used in several works and are expected to be used in many more
Tardu, Sedat. « Ecoulement turbulent instationnaire près d'une paroi : réponse des structures turbulentes : [thèse en partie soutenue sur un ensemble de travaux] ». Grenoble 1, 1988. http://www.theses.fr/1988GRE10137.
Texte intégralSalaun, Vincent. « La pérennité des organisations temporaires (OT) : compréhension du rôle conjoint de la pulsation organisationnelle et de la logistique : l'apport de l'étude des festivals musicaux ». Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM2016.
Texte intégralToday, France is dotted with more than 2 000 music festivals, which represent important social and economic issues, threatened by the combination of a funding decreasing and charges increasing. Far from trivial, this finding has a special resonance for the management researcher who saw these music festivals as an extreme case of pervasive organizational form: the Temporary Organizations (TO). In this context, the thesis work on understanding the articulation between organizational continuity and logistics management in the TO to try to identify the impact of this relation on continuation of TO with repetitive projects like music festivals but also like humanitarians or military interventions. A research question can then be asked: " How organizational continuity and logistics management can they jointly contribute to the continuation of a temporary organization ?". The thesis is supported by a qualitative methodology based on four case studies of French actual music festivals and is split in two parts: the first one focused on the organizational continuity and highlight a pulsatory phenomena which lead to evolutions of the structures and the ways of coordination in the organization, the second part is focused on the logistics management and show the strategic place of the logistics competencies on the continuation of TO. At the end, the thesis show that one of the most important challenge for music festival managers resides in the development, the conservation, and the mobilisation of specifics logistics competencies, especially in transitional phases in upstream and downstream of the events
Contri, Benjamin. « Equations de réaction-diffusion dans un environnement périodique en temps - Applications en médecine ». Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4711/document.
Texte intégralThis phD thesis investigates reaction-diffusion equations in a time periodic environment. These equations model the evolution of a cancerous tumor in the presence of a treatment that corresponds to an immunotherapy in the firs part of the manuscript, and to a cytotoxic chemotherapy after. We begin by considering time-periodic nonlinearities for which 0 and 1 are linearly stable equilibrium states. We study uniqueness, monotonicity and stability of pulsating fronts. We also provide some conditions for the existence and non-existence of such solutions.In the second part of the manuscript, we begin by working on time-periodic nonlinearities which are the sum of a positive function which stands for the growth of the tumor in the absence of treatment and of a death term of cancerous cells due to treatment. We are interested in equilibrium states of such nonlinearities, and we will infer from this study spreading properties and existence of pulsating fronts. We then refine the model by considering nonlinearities which are the sum of an asymptotic periodic nonlinearity and of a small perturbation. In particular we prove that the spreading properties remain valid in this case. To finish, we are interested in the influence of the protocol of the treatment
STRZELECKI, ALAIN. « Etude du detachement tourbillonnaire en ecoulement perturbe : application a la debimetrie-vortex ». Toulouse 3, 1989. http://www.theses.fr/1989TOU30040.
Texte intégralToussaint, Grégoire. « Apport des écoulements secondaires et pulsés et de la vélocimétrie IRM à la filtration de fluides biologiques ». Compiègne, 2000. http://www.theses.fr/2000COMP1310.
Texte intégralФем'як, Я. М. « Підвищення ефективності руйнування гірських порід при бурінні свердловин за рахунок енергії пульсуючих потоків ». Thesis, Івано-Франківський національний технічний університет нафти і газу, 2007. http://elar.nung.edu.ua/handle/123456789/4226.
Texte intégralЗащищается 8 научных работ, содержащих теоретические, экспериментальные и промысловые исследования, связанные с интенсификацией процессов разрушения горных пород за счет воздействия на них пульсационных потоков промывочной жидкости. Сущность нового способа возбуждения разнообразных по величине импульсов и колебаний давления с широким диапазоном частот и амплитуд состоит в том, что с помощью гидродинамического пульсатора на забое скважины последовательно создаются колебания импульсов давления различной амплитуды и широкого спектра гармоник. В гидросистеме, содержащей такое устройство, при определенных условиях течения промывочной жидкости проявляются разные гидродинамические явления. С целью получения наглядных результатов этих явлений разработана специальная экспериментальная установка. С механизма работы гидродинамического пульсатора следует, что можно использовать как специальный выбор состава и физико-химических параметров промывочной жидкости, так и конструктивные особенности пульсатора, способствующие турбулизации жидкости и формированию различных режимов пульсационных потоков жидкости вследствие захлопывания образовавшихся паровых или газовых пузырьков. При этом происходит пульсационное уменьшение давления с частотой от 1 до 12 Гц та с амплитудой от 1 до 3 МПа. Экспериментальными исследованиями установлена возможность возникновения и передача пульсационных колебаний при истечении промывочной жидкости сквозь пульсационно-кавитационную камеру та гидромониторное сопло. С характера пульсационных потоков установлено мгновенное уменьшение давления после пульсатора, которое способствует отделению выбуренной породы от забоя скважины. Пульсационные течения прекращаются как при малых значениях параметра пульсации, которым соответствует развитый режим пульсационного течения, так и при больших значениях параметра пульсации, которым соответствуют сравнительно небольшие размеры пульсационных потоков. Установлено, что с уменьшением параметра пульсации относительная длина полости (каверны) растет, а с увеличением угла раскрытия сопла пульсатора при других равных условиях относительная длина пульсационной полости в границах сопла устройства уменьшается. Исследовано, что для пульсационных устройств колебаний угол расширения струи жидкости имеет большее значение, чем угол расширения струи жидкости после насадки гидромонитора. Установлено, что для всех режимов но давлению на входе в гидродинамическое устройство с уменьшением параметра пульсации амплитуда пульсационных колебаний увеличивается и достигает максимального значения при К≈0,3, а затем уменьшается. Пульсационные автоколебания наблюдаются при К = 0,1÷0,6. Методика гидродинамических явлений может использоваться при проектировании и эксплуатации буровых долот, в состав которых входит гидродинамический пульсатор. Разработана новая конструкция бурового трехлопастного долота, эффективность работы которого достигается увеличением его проходки и механической скорости бурения за счет гидродинамических устройств-пульсаторов, вмонтированных в промывочные узлы долота под разными углами уклона относительно оси долота. Предварительные эксплуатационные испытания бурового трехлопастного долота показали его работоспособность и эффективность. Использование долота в промышленных условиях обеспечивает увеличение механической скорости бурения в 1,5 - 2 раза за счет интенсивности разрушения пород, подтверждая тем самым своеобразность использования пульсаторов в решении проблем эффективного разрушения горных пород при бурении скважин.
There have been 8 scientific works presented for defence, which contain theoretical, experimental and industrial investigations, directed towards improving the process of rock destruction at the borehole bottom by means of three-blade drilling bits with pulsator inserts. There has been suggested new construction of hydrodynamic pulsator with input of drilling fluid along the channel for back washing of the fluid flow in the cylinder part of the pulsating chamber and in the diffuser in which the dissolved air is released in the form of bulles. On the basis of theoretical and experimental research it was determinacy that pulsations occur in the drilling fluid flow when it goes through pulsator when there is no pressure at all as well as when antipressure is available. The character of the pulsating flow has been determined, which is in the decrease of pressure at the outlet of pulsator head with the amplitude of 1 to 3 MGP and frequency of 1 to 12 Herts. Transmission of pulse pressure range to hydromonit head when the drilling fluid flow leaves the hydrodynamic pulsator has also been determined. The results obtained are new and have practical value. Practical significance of the results is in the scientific substantiation of amplitude frequency characteristics of hydrodynamic pulsator which are to be used to improve technical and economic indices of borehole (well) drilling. The results obtained were used to improve the design of three-blade drilling bit. The main results of the dissertation have been implemented into drilling practice.
Ding, Weiwei. « Propagation phenomena of integro-difference equations and bistable reaction-diffusion equations in periodic habitats ». Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4737.
Texte intégralThis dissertation is concerned with propagation phenomena of some evolution equations in periodic habitats. The main results consist of the following two parts. In the first part, we investigate the spatial spreading phenomena of some spatially periodic integro-difference equations. Firstly, we establish a general theory on the existence of spreading speeds for noncompact evolution systems, under the hypothesis that the linearized systems have principal eigenvalues. Secondly, we introduce the notion of uniform irreducibility for finite Radon measures on the circle. It is shown that, any generalized convolution operator generated by such a measure admits a principal eigenvalue. Finally, applying the above general theories, we prove the existence of spreading speeds for some integro-difference equations with uniformly irreducible dispersal kernels. In the second part, we study the front propagation phenomena of spatially periodic reaction-diffusion equations with bistable nonlinearities. Firstly, we focus on the propagation solutions in the class of pulsating fronts. It is proved that, under various assumptions on the reaction terms, pulsating fronts exist when the spatial period is small or large. We also characterize the sign of the front speeds and we show the global exponential stability of the pulsating fronts with nonzero speed. Secondly, we investigate the propagation solutions in the larger class of transition fronts. It is shown that, under suitable assumptions, transition fronts are reduced to pulsating fronts with nonzero speed. But we also prove the existence of new types of transition fronts which are not pulsating fronts
Barré, Christian. « Etude expérimentale des écoulements pulsés compressibles : application a l'aérodynamique des conduits d'admission d'un moteur thermique ». Poitiers, 1988. http://www.theses.fr/1988POIT2294.
Texte intégralBenmadda, El Mostafa. « Etude de l'ecoulement pulse d'un fluide incompressible dans une conduite elastique : application a la circulation arterielle ». Poitiers, 1987. http://www.theses.fr/1987POIT2267.
Texte intégralBrossard, Jérôme. « Contribution à l'étude de la turbulence à travers l'analyse d'un écoulement généré par la houle entre deux plaques ». Rouen, 1986. http://www.theses.fr/1986ROUES030.
Texte intégralKoźmiński, Grzegorz. « Eksploatacja pulsatorów w warunkach nieciągłego dopływu wód popłucznych ». Rozprawa doktorska, 1994. https://repolis.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=2638.
Texte intégralKoźmiński, Grzegorz. « Eksploatacja pulsatorów w warunkach nieciągłego dopływu wód popłucznych ». Rozprawa doktorska, 1994. https://delibra.bg.polsl.pl/dlibra/docmetadata?showContent=true&id=2638.
Texte intégralNitta, Atsuko. « Evaluation of mode identification techniques in two key white dwarf pulsators ». Thesis, 2000. http://hdl.handle.net/2152/29827.
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Brandão, Isa Maria Bernardo. « Towards the understanding of the deepest layers of solar-like pulsators ». Doctoral thesis, 2012. https://repositorio-aberto.up.pt/handle/10216/65050.
Texte intégralBrandão, Isa Maria Bernardo. « Towards the understanding of the deepest layers of solar-like pulsators ». Tese, 2012. https://repositorio-aberto.up.pt/handle/10216/65050.
Texte intégralJacyszyn-Dobrzeniecka, Anna. « Analysis of the three dimensional structure of the Magellanic System based on classical pulsators from the OGLE project ». Doctoral thesis, 2021. https://depotuw.ceon.pl/handle/item/4024.
Texte intégralObłoki Magellana sa jednymi z najblizszych nam galaktyk. Łacznie z otaczajacymi strukturami tworza System Magellana, który mozna nazwac naszym „lokalnym laboratorium” w kontekscie oddziaływan miedzygalaktycznych. Jednym z ich najwazniejszych rezultatów jest istnienie struktury rozciagajacej sie pomiedzy Obłokami, zwanej Mostem Magellana. W ramach niniejszej rozprawy doktorskiej zbadałam trójwymiarowa strukture Obłoków Magellana oraz Mostu Magellana. Wykorzystałam w tym celu klasyczne gwiazdy pulsujace, bedace zarazem swiecami standardowymi, pochodzace z Kolekcji Gwiazd Zmiennych projektu OGLE. Pierwsza czesc mojej pracy doktorskiej przedstawia analize trójwymiarowego rozkładu cefeid klasycznych w Systemie Magellana (Jacyszyn-Dobrzeniecka i in., 2016, Acta Astronomica, 66, 149). W Wielkim Obłoku Magellana sa one skupione w wyraznych strukturach lezacych w płaszczyznie dysku – głównie w poprzeczce oraz ramieniu północnym. W Małym Obłoku Magellana cefeidy klasyczne rozłozone sa bardziej równomiernie i tworza strukture o kształcie elipsoidy trójosiowej, której najdłuzsza os jest pieciokrotnie dłuzsza niz krótkie osie. Mały Obłok Magellana jest rozciagniety prawie wzdłuz linii widzenia. Kolejny etap przedstawia analize trójwymiarowego rozkładu gwiazd pulsujacych typu RR Lutni, nalezacych do starej populacji gwiazdowej (Jacyszyn- Dobrzeniecka i in., 2017, Acta Astronomica, 67, 1). W obydwu Obłokach Magellana gwiazdy te tworza regularne struktury, które mozna opisac za pomoca trójosiowych elipsoid. Porównanie otrzymanych przeze mnie rozkładów dla gwiazd obydwu typów wskazuje na to, ze gwiazdy stare rozłozone sa na znacznie wiekszym obszarze, a takze nie tworza wyraznych podstruktur, w przeciwienstwie do gwiazd młodych. W nastepnej czesci pracy przedstawiłam szczegółowa analize zaktualizowanej próbki cefeid klasycznych zaklasyfikowanych jako przynalezace do Mostu Magellana (Jacyszyn-Dobrzeniecka i in., 2020, The Astrophysical Journal, 889, 25). Wykazałam, ze cefeidy klasyczne tworza połaczenie pomiedzy Obłokami zarówno w dwóch jak i trzech wymiarach. Ponadto wiek wiekszosci z nich zgodny jest z hipoteza, ze zostały one uformowane w obszarze Mostu Magellana w wyniku ostatniego zblizenia Obłoków. Dodane do próbki cefeidy anomalne rozłozone sa bardziej równomiernie i nie tworza wyraznego połaczenia. Ostatni etap dotyczy szczegółowej analizy rozkładu gwiazd typu RR Lutni w obszarze Mostu Magellana (Jacyszyn-Dobrzeniecka i in., 2020, The Astrophysical Journal, 889, 26). W tej czesci pracy tej wykazałam, iz stare gwiazdy pulsujace obecne sa w obszarze Mostu Magellana, lecz nie tworza wyraznego połaczenia pomiedzy Obłokami, a ich rozkład raczej przypomina nakładajace sie na siebie rozległe halo. Dodatkowo przedstawiłam rekonstrukcje analizy wykonanej przez Belokurova i in. (2017, Monthly Notices of the Royal Astronomical Society, 466, 4711) wykazujac, ze nie da sie odtworzyc uzyskanego przez nich połaczenia pomiedzy Obłokami Magellana bez uwzgledniania wielu niefizycznych artefaktów w koncowej próbce danych.