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Letteratura scientifica selezionata sul tema "Shock profiles"

Autore: Grafiati

Pubblicato: 21 settembre 2024

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Articoli di riviste sul tema "Shock profiles"

ASAKURA, FUMIOKI, e MITSURU YAMAZAKI. "VISCOUS SHOCK PROFILES FOR 2 × 2 SYSTEMS OF HYPERBOLIC CONSERVATION LAWS WITH AN UMBILIC POINT". Journal of Hyperbolic Differential Equations 06, n. 03 (settembre 2009): 483–524. http://dx.doi.org/10.1142/s0219891609001903.

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This article analyzes the existence of viscous shock profiles joining two states satisfying the Rankine–Hugoniot condition that comes from hyperbolic 2 × 2 systems of conservation laws having quadratic flux functions with an isolated umbilic point: the point where the characteristic speeds coincide and the Jacobian matrix of the flux functions is diagonalizable. The systems studied in this note are particularly in Schaeffer and Shearer's cases I and II which are relevant to the three-phase Buckley–Leverett model for oil reservoir flow. It is shown that any compressive and overcompressive shocks have a viscous shock profile provided that there are no undercompressive shock with viscous profile having the same propagation speed. The idea of the proof is a generalization of the first theorem of Morse to noncompact level sets. It is also shown that there exists a shock satisfying the Liu–Oleĭnik condition but having no viscous shock profile. In this case, there is an undercompressive shock with viscous shock profile.

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Smith, M. D., e P. W. J. L. Brand. "H2 profiles of C-type bow shocks". Monthly Notices of the Royal Astronomical Society 245, n. 1 (1 luglio 1990): 108. http://dx.doi.org/10.1093/mnras/245.1.108.

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Summary We present emission-line profiles of molecular hydrogen from curved C-shocks within molecular clouds. Shock configurations arising from the supersonic motion of jets and bullets within a dense cloud are chosen. Bow shock speeds in the range vw = 40-200 km s-1 are investigated. Breakdown through dissociation and selfionization restricts the C-shock section to the bow tail. We find that profiles ire essentially single-peaked and narrow with full widths (at 10 per cent maximum intensity, deconvolved) of up to about 50,40 and 30 km s-1 for cones, hemispherical caps and paraboloids, respectively. Exceptional field alignments can produce lines as wide as 75 km s-1 in the conical shock model. Line asymmetry is critically dependent on the orientation to the observer and, for low-velocity bows, the magnetic field direction. The peak is never significantly shifted away from the radial component of the pre-shock velocity. These results are consistent with observed profiles from H2 peaks associated with Herbig-Haro objects but not with the particularly broad H2 lines in OMC-1 and DR2 1

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Barker, Blake, e Kevin Zumbrun. "Numerical proof of stability of viscous shock profiles". Mathematical Models and Methods in Applied Sciences 26, n. 13 (4 dicembre 2016): 2451–69. http://dx.doi.org/10.1142/s0218202516500585.

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We carry out the first rigorous numerical proof based on Evans function computations of stability of viscous shock profiles, for the system of isentropic gas dynamics with monatomic equation of state. We treat a selection of shock strengths ranging from the lower stability boundary of Mach number [Formula: see text], below which profiles are known by energy estimates to be stable, to the upper stability boundary of [Formula: see text], above which profiles are expected to be provable by rigorous asymptotic analysis to be stable. These results open the possibilities of: (i) automatic rigorous verification of stability or instability of individual shocks of general systems, and (ii) rigorous proof of stability of all shocks of particular systems.

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BEN ABDALLAH, NAOUFEL, HEDIA CHAKER e CHRISTIAN SCHMEISER. "THE HIGH FIELD ASYMPTOTICS FOR A FERMIONIC BOLTZMANN EQUATION: ENTROPY SOLUTIONS AND KINETIC SHOCK PROFILES". Journal of Hyperbolic Differential Equations 04, n. 04 (dicembre 2007): 679–704. http://dx.doi.org/10.1142/s0219891607001318.

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The high field approximation of a fermionic Boltzmann equation of semiconductors is performed after the formation of shocks. By employing a new entropy, whose dissipation measures the departure from the high field equilibrium, convergence towards the entropic solution of the limiting conservation law is proven. The entropy is also used to construct kinetic shock profiles for entropic shocks and to prove non-existence of non-entropic shock profiles.

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Fuda, Nguyen, Le Ngoc Tram e William T. Reach. "Modeling CO Line Profiles in Shocks of W28 and IC 443". Astrophysical Journal 944, n. 1 (1 febbraio 2023): 17. http://dx.doi.org/10.3847/1538-4357/acb259.

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Abstract Molecular emission arising from the interactions of supernova remnant (SNR) shock waves and molecular clouds provide a tool for studying the dispersion and compression that might kick-start star formation as well as understanding cosmic-ray production. Purely rotational CO emission created by magnetohydrodynamic shock in the SNR–molecular cloud interaction is an effective shock tracer, particularly for slow-moving, continuous shocks into cold inner clumps of the molecular cloud. In this work, we present a new theoretical radiative transfer framework for predicting the line profile of CO with the Paris–Durham 1D shock model. We generated line profile predictions for CO emission produced by slow, magnetized C shocks into gas of density ∼104 cm−3 with shock speeds of 35 and 50 km s−1. The numerical framework to reproduce the CO line profile utilizes the large velocity gradient (LVG) approximation and the omission of optically thick plane-parallel slabs. With this framework, we generated predictions for various CO spectroscopic observations up to J = 16 in SNRs W28 and IC 443, obtained with SOFIA, IRAM-30 m, APEX, and KPNO. We found that CO line profile prediction offers constraints on the shock velocity and pre-shock density independent of the absolute line brightness and requires fewer CO lines than diagnostics using a rotational excitation diagram.

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Jadhav, Ravi Sudam, e Amit Agrawal. "Shock Structures Using the OBurnett Equations in Combination with the Holian Conjecture". Fluids 6, n. 12 (26 novembre 2021): 427. http://dx.doi.org/10.3390/fluids6120427.

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In the present work, we study the normal shock wave flow problem using a combination of the OBurnett equations and the Holian conjecture. The numerical results of the OBurnett equations for normal shocks established several fundamental aspects of the equations such as the thermodynamic consistency of the equations, and the existence of the heteroclinic trajectory and smooth shock structures at all Mach numbers. The shock profiles for the hydrodynamic field variables were found to be in quantitative agreement with the direct simulation Monte Carlo (DSMC) results in the upstream region, whereas further improvement was desirable in the downstream region of the shock. For the discrepancy in the downstream region, we conjecture that the viscosity–temperature relation (μ∝Tφ) needs to be modified in order to achieve increased dissipation and thereby achieve better agreement with the benchmark results in the downstream region. In this respect, we examine the Holian conjecture (HC), wherein transport coefficients (absolute viscosity and thermal conductivity) are evaluated using the temperature in the direction of shock propagation rather than the average temperature. The results of the modified theory (OBurnett + HC) are compared against the benchmark results and we find that the modified theory improves upon the OBurnett results, especially in the case of the heat flux shock profile. We find that the accuracy gain is marginal at lower Mach numbers, while the shock profiles are described better using the modified theory for the case of strong shocks.

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Zhu, Z., A. Simionescu, H. Akamatsu, X. Zhang, J. S. Kaastra, J. de Plaa, O. Urban, S. W. Allen e N. Werner. "A shock near the virial radius of the Perseus Cluster". Astronomy & Astrophysics 652 (agosto 2021): A147. http://dx.doi.org/10.1051/0004-6361/202140673.

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Context. Previous X-ray studies of the Perseus Cluster, consisting of 85 Suzaku pointings along eight azimuthal directions, revealed a particularly steep decrease in the projected temperature profile near the virial radius (∼r200) towards the northwest (NW). Aims. To further explore this shock candidate, another 4 Suzaku observations on the NW edge of the Perseus Cluster have been obtained. These deeper data were designed to provide the best possible control of systematic uncertainties in the spectral analysis. Methods. Using the combined Suzaku observations, we have carefully investigated this interesting region by analyzing the spectra of various annuli and extracting projected thermodynamic profiles. Results. We find that the projected temperature profile shows a break near r200, indicating a shock with ℳ = 1.9 ± 0.3. Corresponding discontinuities are also found in the projected emission measure and the density profiles at the same location. This evidence of a shock front so far away from the cluster center is unprecedented, and may provide a first insight into the properties of large-scale virial shocks which shape the process of galaxy cluster growth.

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M., Gowtham, Sreenivasaraja N. e Kasmir Anthireyan. "MATHEMATICAL DERIVATION OF DIFFERENT NOSE ANGLES TO REDUCE DRAG FORCE ON ROCKET". International Journal of Innovative Research in Advanced Engineering 9, n. 12 (31 dicembre 2022): 471–82. http://dx.doi.org/10.26562/ijirae.2022.v0912.03.

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This article elaborates on the study of the mathematical expressions for the different nose profiles and their dimensions. The chosen nose profiles are Conical, Bi-conic, Parabolic, Elliptical, and Ogive. And order to improve the study of the pressure coefficient, shock wave angle, shock location, and drag characteristics of nose profiles to select which profile is preferable for a rocket under the aerodynamic forces.

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Howard, Peter, e Kevin Zumbrun. "Stability of undercompressive shock profiles". Journal of Differential Equations 225, n. 1 (giugno 2006): 308–60. http://dx.doi.org/10.1016/j.jde.2005.09.001.

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Yang, Zhao, e Kevin Zumbrun. "Stability of Hydraulic Shock Profiles". Archive for Rational Mechanics and Analysis 235, n. 1 (29 luglio 2019): 195–285. http://dx.doi.org/10.1007/s00205-019-01422-4.

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Più fonti

Tesi sul tema "Shock profiles"

Raoofi, Mohammadreza. "Asymptotic behavior of perturbed viscous shock profiles". [Bloomington, Ind.] : Indiana University, 2005. http://wwwlib.umi.com/dissertations/fullcit/3178477.

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Thesis (Ph.D.)--Indiana University, Dept. of Mathematics, 2005.
Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3170. Adviser: Kevin Zumbrun. "Title from dissertation home page (viewed Dec. 4, 2006)."

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Paccione, Kristin E. "Cytokine and Chemokine Profiles in a Rat Model of Hemorrhagic Shock after Immuno-Modulation by Androstenetriol". VCU Scholars Compass, 2005. http://hdl.handle.net/10156/2049.

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Rodríguez, Gasén Rosa. "Modelling SEP events: latitudinal and longitudinal dependence of the injection rate of shock-accelerated protons and their flux profiles". Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/31855.

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Gradual SEP events is one of the greatest hazards in space environment, particularly for the launch and operation of spacecraft and for manned exploration. Predictions of their occurrence and intensity are essential to ensure the proper operation of technical and scientific instruments. However, nowadays there is a large gap between observations and models these events that can lead to predictions. This work focuses on the modelling of SEP events, particularly, on the influence of the observer's relative position and of the shock strength, on the simulated SEP flux profiles. Part I of the thesis, deals with 3D MHD simulations of interplanetary shocks. We have studied the potential relevance of the latitude of the observer on the evolution of the strength of the shock and its influence on the injection rate of shock-accelerated particles; thus, on the resulting flux profiles. It is the first time that such dependence on the latitude is quantified from the modelling of SEP events, because most of the codes used so far to simulate interplanetary shocks are not 3D codes or they have been applied to near-ecliptic events. To study the influence of the latitude of the observer and the strength of the shock in the SEP flux profiles, we have simulated the propagation of two shocks (slow and fast) up to several observers placed at different positions with respect to the nose of the shock. We have calculated the evolution of the plasma and magnetic field variables at the cobpoint, and we have derived the injection rate of shock-accelerated particles and the resulting proton flux profiles to be measured by each observer. We have discussed how observers located at different positions in space measure different SEP profiles, showing that variations on the latitude may result in intensity changes of up to one order of magnitude. In Part II, we have used a new shock-and-particle model to simulate the 1 March 1979 SEP event that was observed by three different spacecraft. These spacecraft were positioned at similar radial distances but at significantly different angular positions, with respect to the associated solar source location. This particular scenario allows us to test the capability of the model to study the relevance of longitudinal variations in the shape of the intensity flux profiles, and to derive the injection rate of shock-accelerated particles. Despite the interest of multi-spacecraft events and due to the restrictions that they impose, this is just the second multi-spacecraft scenario for which their shock-particle characteristics have been modelled. For the first time, a simulation of a propagation of an interplanetary shock has simultaneously reproduced the time shock arrival and the relevant plasma jumps across the shock at three spacecraft. We have fitted the proton intensities at the three spacecraft for different energy channels, and we have derived the particle transport conditions in space. We have quantified the efficiency of the shock at injecting particles in its way toward each observer, and we have discussed the influence of the observer's relative position on the injection rate of shock-accelerated particles. We have concluded that in this specific event the evolution of the injection rate can not be completely explained in terms of the normalized velocity jump. The work performed during this thesis shows that the injection rate of shock-accelerated particles and their resulting flux profiles depend both on the latitude and on the longitude of the observer. This implies that more SEP events have to be modelled in order to quantify this conclusion on firm ground.
Els esdeveniments graduals de partícules solars energètiques (SEP) són un risc important per als astronautes i l’ instrumentació espacial. És per això que són necessàries eines de predicció de la intensitat i l'ocurrència de les tempestes de partícules solars per a garantitzar l'operativitat del material tècnic i científic embarcat. Existeix un gran buit, però, entre les prediccions del models actuals (per a ús en meteorologia espacial), i les observacions d'esdeveniments SEP. El treball realitzat durant aquesta tesi doctoral es centra en diversos aspectes de la simulació d'esdeveniments SEP. En particular, analitzem la influència de la posició relativa de l'observador i de la força del xoc en els perfils de flux derivats del nostre model combinat xoc-i-partícula. A partir de simulacions 3D, obtenim que el ritme d'injecció de partícules accelerades pel xoc depèn de la longitud de l'observador i demostrem, per primera vegada, que també depèn de la seva latitud. I es mostra que, conseqüentment, els perfils de flux detectats poden variar en un ordre de magnitud depenent de la connexió magnètica de l'observador amb el front del xoc. A més a més, presentem una simulació 2D d'un esdeveniment solar vist per tres sondes interplanetàries, pel qual s'ha ajustat, per primera vegada, l'arribada del xoc i els perfils de intensitat dels protons de diferents canals d'energia observats per cadascuna de les sondes. Així mateix, hem ajustat els salts en velocitat i camp magnètic a l'arribada del xoc, hem derivat les condicions de transport de les partícules i hem quantificat l'eficiència del xoc com a injector de partícules. La conclusió final del treball és que els futurs models de predicció d'esdeveniments SEP per a meteorologia espacial han de tenir en compte la geometria global de l'escenari solar-interplanetari.

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Tanja, Krunić. "Numeričke procedure u definisanju pravilnih rešenja zakona održanja". Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=101094&source=NDLTD&language=en.

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U okviru ove doktorske disertacije posmatrani su zakoni održanja sa funkcijom fluksa koja ima prekid u x = 0, pri čemu delovi fluksa levo i desno od x = 0 imaju smo po jedan ekstrem. U prvoj glavi se može naći pregled osnovnih pojmova, definicija i teorema. U drugoj glavi su opisani hiperbolični sistemi zakona održanja, slaba rešenja, kao i numerički postupci za njihovo rešavanje. U trećoj glavi su predstavljeni diskretni profili darnih talasa. U četvrtoj glavi su opisani zakoni održanja sa prekidnom funkcijom fluksa i ukratko su predstvaljeni rezultati drugih autora iz ove oblasti. U petoj glavi je najpre analizirana tzv. jednačina sa dva fluksa u slučaju kada oba dela fluksa levo i desno od x = 0 imaju minimum, a pri tome se seku u najviše jednoj tačci unutar intervala. Primenom regularizacije na intervalu [−ε, ε], za ε > 0 dovoljno malo, dokazano je postojanje diskretnih udarnih profila za postupak Godunova za zakone održanja sa promenljivom funkcijom fluksa. Definisan je i odgovarajući diskretan uslov entropije, a postojanje entropijskog diskretnog udarnog profila je postavljen kao kriterijum za dopustivost udarnih talasa. Potom je analizirana ista jednačina u slucaju kada deo fluksa levo od x = 0 ima maksimum, a deo fluksa desno od x = 0 minimum, dok se oba dela fluksa seku na krajevima posmatranog intervala. U ovom slučaju, uopšten je uslov entropije. U okviru ove glave je prikazano nekoliko numeričkih primera za oba opisana slučaja. Numerički rezultati su dobijeni korišcenjem softvera razvijenog za potrebe ove teze u programskom paketu Mathematica.
We consider conservation laws with a flux discontinuity at x = 0, where the flux parts from both left and right hand side of x = 0 have at most one extreme on the observed domain. The first chapter provides elementary definitions and theorems..The second chapter refers to hyperbolic systems of conservation laws, their solutions, and numerical procedures. The third chapter is devoted to discrete shock profiles. The fourth chapter describes conservation laws with discontinuous flux functions and provides basic information upon known results in this field. In the fifth chapter, we first analyse the two-flux equation when both flux parts have a minimum and cross at most at one point in the interior of the domain. Using a flux regularization on the interval [−ε, ε], for ε > 0 small enough, we show the existence of discrete shock profiles for Godunov’s scheme for conservation laws with discontinuous flux functions. We also define a discrete entropy condition accordingly, and use the existence of an entropy discrete shock profile as an entropy criterion for shocks. Then we analyse the same problem in the case when the flux part on the left of x = 0 has a maximum and the part on the right of x = 0 has a minimum, whereas the fluxes cross at the edges of the interval. We derive a more general discrete entropy condition in this case. We provide several numerical examples in both of the above mentioned flux cases. All the presented numerical results are obtained using a program written in Mathematica. Finally, in chapter six, we prove the existence of singular shock waves in the case when the graph of one of the flux parts is above the graph of the other one on the entire domain. For that purpose, we use the shadow wave technique. At the end of this chapter, we provide a numerical verification of the obtained singular solution.

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Scucchia, Federica. "Transcriptional profiles inferring thermal stress responses of the coral Oculina patagonica from the Eastern Mediterranean Sea". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17967/.

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During the past several decades, corals worldwide have been dealing with a considerable increase in water temperature due to climate change, which is predicted to increase the frequency of coral bleaching and mass mortality events. Nevertheless, corals show differences in stress susceptibility and they are not all affected evenly. The symbiotic coral Oculina patagonica from the Eastern Mediterranean Sea can thrive in relatively unstable environments and is considered a stress-tolerant species. In this study, baseline expression and temporal dynamics of induction of a 70-kDa heat shock protein (HSP70) after an acute heat stress were analyzed in O. patagonica to investigate the influence of its peculiar physiological traits on stress responsiveness. Furthermore, data collected were further discussed within a comparative analysis with similar findings reported in 5 temperate corals of the Mediterranean Sea (Franzellitti et al., 2018). Results show that O. patagonica hsp70 transcriptional response aligns with the formerly observed high resistance for elevated sea water temperatures of this species. The multispecies comparison shows that hsp70 expression varies in accordance with the stress sensitivity of coral populations inhabiting different thermal environments and possessing different trophic strategies and morphologies. This study also reports an analysis of the post heat-stress transcriptional regulation of transcripts related to energy metabolism (gadph), redox regulation (sod), and DNA damage (bcl-2 and bax), disclosing the time line of the events occurring in O. patagonica in response to an acute heat stress, which aligns with its quick recovery from bleaching. These molecular processes analysis is particularly demanding for corals inhabiting the Mediterranean Sea, in light of projected scenarios of anthropogenic global change.

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Coeuret, Lucas. "Stabilité de profils de chocs totalement discrets pour les systèmes de lois de conservation". Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES078.

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Cette thèse aborde l'analyse de la stabilité des profils de chocs totalement discrets pour les systèmes de lois de conservation. Ces profils correspondent à l'approximation d'ondes progressives discontinues par des schémas aux différences finies conservatifs. De telles solutions discontinues apparaissent naturellement dans l'étude des systèmes de lois de conservation qui peuvent modéliser de nombreuses situations physiques comme par exemple la dynamique des gaz. L'étude des profils de choc totalement discrets se divise essentiellement en deux axes, le premier étant de construire de tels profils discrets et donc de prouver leur existence, et le second étant d'étudier leur stabilité. L'objectif principal de cette thèse est d'approfondir cette seconde direction. De nombreux résultats existants sur la stabilité des profils de chocs totalement discrets introduisent des hypothèses contraignantes, telles que la restriction aux lois de conservation scalaires ou encore le fait d'imposer que les discontinuités approchées soient de faible amplitude. Les résultats de cette thèse visent à ouvrir la voie vers des résultats de stabilité non linéaire qui traiterait de systèmes de lois de conservation et non pas seulement de lois scalaires, et qui remplacerait l'hypothèse de faible amplitude des discontinuités par une hypothèse spectrale sur le linéarisé du schéma autour du profil de choc discret considéré. Au niveau des résultats obtenues, dans un premier temps, la thèse se focalise sur l'obtention d'estimées de décroissance fines sur le linéarisé du schéma aux niveaux de solutions particulières. On se concentrera d'abord sur le linéarisé au niveau des solutions constantes avant de passer au cas plus compliqué du linéarisé au niveau des profils de chocs totalement discrets. D'un point de vue spectral, l'analyse du problème des chocs fait apparaitre une valeur propre plongée dans le spectre essentiel. Il en résulte de nouveaux termes dans l'analyse de la fonction de Green du schéma linéarisé et on détaille les propriétés de décroissance de chacun de ces termes. Dans une dernière partie, on utilise les estimations obtenues sur l'opérateur linéarisé pour établir un argument de stabilité non linéaire
This thesis deals with the stability analysis of discrete shock profiles for systems of conservation laws. These profiles correspond to approximations of discontinuous traveling waves by conservative finite difference schemes. Such discontinuous solutions appear naturally in the study of conservation law systems, which can model many physical situations, such as gas dynamics. The study of discrete shock profiles is essentially divided into two directions, the first one focusing on the construction of such discrete profiles and thus on the proof of their existence, and the second one studying their stability. The main objective of this thesis is to investigate this second direction. Many existing results on the stability of discrete shock profiles introduce constraining hypotheses, such as the restriction to scalar conservation laws or the requirement that the approximated discontinuities should be of small amplitude. The results of this thesis aim to pave the way towards nonlinear stability results that would deal with systems of conservation laws and not just scalar laws, and that would replace the smallness assumption on the amplitude of the discontinuities by a spectral assumption on the linearization of the numerical scheme about the discrete shock profile under consideration. In terms of the results obtained, the thesis initially focuses on obtaining sharp decay estimates for the linearization of the numerical scheme about particular solutions. We will first focus on the linearization about constant solutions before moving on to the more complicated case of the linearization about discrete shock profiles. From a spectral point of view, the analysis of the shock problem implies the existence of an eigenvalue located within the essential spectrum. This results in new terms in the analysis of the Green's function of the linearized scheme and decay properties of each of these terms will be presented. In a final section, we use the estimates obtained on the linearized operator to establish a nonlinear stability argument

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Ignace, R., W. Waldron, J. Cassinelli e A. Burke. "X-ray Emission Line Profiles from Wind Clump Bow Shocks in Massive Stars". Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/6249.

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The consequences of structured flows continue to be a pressing topic in relating spectral data to physical processes occurring in massive star winds. In a preceding paper, our group reported on hydrodynamic simulations of hypersonic flow past a rigid spherical clump to explore the structure of bow shocks that can form around wind clumps. Here we report on profiles of emission lines that arise from such bow shock morphologies. To compute emission line profiles, we adopt a two-component flow structure of wind and clumps using two “beta” velocity laws. While individual bow shocks tend to generate double-horned emission line profiles, a group of bow shocks can lead to line profiles with a range of shapes with blueshifted peak emission that depends on the degree of X-ray photoabsorption by the interclump wind medium, the number of clump structures in the flow, and the radial distribution of the clumps. Using the two beta law prescription, the theoretical emission measure and temperature distribution throughout the wind can be derived. The emission measure tends to be power law, and the temperature distribution is broad in terms of wind velocity. Although restricted to the case of adiabatic cooling, our models highlight the influence of bow shock effects for hot plasma temperature and emission measure distributions in stellar winds and their impact on X-ray line profile shapes. Previous models have focused on geometrical considerations of the clumps and their distribution in the wind. Our results represent the first time that the temperature distribution of wind clump structures are explicitly and self-consistently accounted for in modeling X-ray line profile shapes for massive stars.

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Hsu, Ting-Hao. "A Geometric Singular Perturbation Theory Approach to Viscous Singular Shocks Profiles for Systems of Conservation Laws". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437144893.

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Voyez, Juliette. "Mesures optiques de profils de turbulence atmosphérique pour les futurs systèmes d'optique adaptative". Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00975076.

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L'optique adaptative classique est limitée par l'anisoplanétisme. Pour remédier à cette limitation, de nouveaux concepts, appelés optiques adaptatives grand champ, ont été développés. Ces systèmes analysent la turbulence atmosphérique dans le volume, ce qui accroît le champ de correction. Ces techniques requièrent une connaissance précise du profil de Cn2. Mon étude consiste à valider sur le ciel une nouvelle technique de mesure du profil de Cn2, appelée CO-SLIDAR, à partir des corrélations des mesures de pentes et de scintillation réalisées avec un analyseur Shack-Hartmann sur étoile binaire. Elle s'organise autour de deux grands axes. On réalise d'abord une simulation bout-en-bout de la reconstruction du profil de Cn2 dans un cas concret d'observation astronomique. On peut ainsi étudier l'impact des différentes sources d'erreur sur la reconstruction du profil de Cn2. Ceci nous permet d'améliorer la procédure d'estimation du profil de Cn2, en prenant en compte les bruits de détection. La deuxième partie de mon étude se consacre à la validation expérimentale. On dimensionne et caractérise en laboratoire un banc d'acquisition, le banc ProMeO. Ceci conduit à une bonne connaissance du fonctionnement du banc et nous permet de corriger certains effets instrumentaux. Le banc ProMeO est finalement couplé au télescope MeO de 1,5 m de diamètre. Les données acquises permettent une reconstruction du profil de Cn2, du sol jusqu'à 17 km, avec une résolution de 600 m. Les profils obtenus par la méthode CO-SLIDAR sont comparés avec succès à des profils issus de données météorologiques. L'ensemble de ces travaux constitue la première validation sur le ciel de la méthode CO-SLIDAR.

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Silveira, Vanessa da Silva. "Análise do perfil de expressão de genes relacionados à resistência a quimioterápicos na leucemia linfóide aguda da criança e do adolescente". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/17/17135/tde-19042018-133533/.

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Com a utilização dos atuais protocolos de tratamento, 70-80% dos casos de leucemia linfóide aguda (LLA) na infância têm obtido sobrevida livre de eventos em cinco anos. Entretanto, os 20% restantes, que se mostram resistentes ao tratamento, apresentam recidivas e as causas desse insucesso no tratamento ainda permanecem desconhecidas. Dessa forma, com o intuito de melhor compreender os mecanismos moleculares que participam desse processo, o presente trabalho teve por objetivo avaliar o perfil de expressão de um painel de genes que foram previamente associados à resistência e/ou sensibilidade aos quimioterápicos: prednisona (F8A, CDK2AP1, BLVRB, CD69), vincristina (RPLP2, CD44, TCFL5, KCNN1, TRIM24), daunorrubicina (MAP3K12, SHOC2, PDCH9, EGR1, KCNN4) e asparaginase (GPR56, MAN1A1, CLEC11A, IGFBP7, GATA3). Para a realização do estudo, foram utilizadas inicialmente amostras de medula óssea de pacientes portadores de LLA pertencentes a quatro grandes centros de oncologia pediátrica do Estado de São Paulo e que foram submetidos ao protocolo de tratamento do GBTLI-99. A análise da expressão gênica foi realizada pela técnica de PCR quantitativa em tempo real, utilizando-se o reagente SYBR Green, o gene GUS? como controle endógeno e amostras de medula óssea normais como referência. A análise dos dados de expressão gênica em relação aos diversos parâmetros clínicos e laboratoriais avaliados na LLA, demonstrou associações importantes entre os diversos genes estudados e variáveis clínicas importantes como contagem de glóbulos brancos ao diagnóstico, presença do antígeno CD10 (CALLA), translocação TEL/AML1, presença de doença residual mínima entre outras. Dentre os genes avaliados destacaram -se como possíveis marcadores de bom prognóstico os genes SHOC2 e GPR56. Posteriormente, reavaliou-se o perfil de expressão desses genes em pacientes submetidos ao protocolo de tratamento europeu do grupo BFM com o intuito de verificar o padrão de expressão em pacientes com um background genético distinto e submetidos a um protocolo terapêutico distinto. Os resultados confirmaram os dados encontrados anteriormente e demonstraram a hiperexpressão do gene SHOC2 (que foi previamente associado à sensibilidade à daunorrubicina) associada ao grupo de pacientes bons respondedores, sugerindo a correlação desse gene com critérios favoráveis de prognóstico. Para verificar o nível de interação desse gene avaliou-se ainda a expressão protéica do mesmo, que confirmou os padrões de expressão gênica obtidos por RQ-PCR. A função do gene SHOC2, que embora não esteja completamente elucidada, já foi anteriormente descrita pela literatura, que demonstra a participação do gene no processo de ativação da proteína Erk pela via Ras. Finalmente para melhor compreender os possíveis mecanismos que envolvem o gene SHOC2 no processo de melhor resposta à quimioterapia, utilizou-se a técnica de RNAi para silenciá- lo na linhagem celular leucêmica Jurkat. Os resultados demosntraram a associação da expressão do gene SHOC2 com proliferação celular e também com a indução de apoptose. Esses dados sugerem que a hiperexpressão desse gene pode ser importante para o processo de sensibilidade das células leucêmicas ao tratamento. Como conclusão, este trabalho demonstrou a associação de diversos genes com importantes parâmetros clínicos da LLA e destaca principalmente o papel do gene SHOC2 como possível alvo terapêutico para o tratamento da leucemia linfóide aguda.
Major improvements have been made in the ALL treatment, which achieved successful rates of approximately 80% of long-terms survival. Despite the significant percentage of success, the remaining 20 % still presents treatment failure and the molecular mechanisms involved in the resistance process remains unclear. The present study was undertaken to analyze and validate the gene expression pattern of the previously described genes related to prednisolone (F8A, CDK2AP1, BLVRB, CD69), vincristine (RPLP2, CD44, TCFL5, KCNN1, TRIM24), daunorubicin (MAP3K12, SHOC2, PDCH9, EGR1, KCNN4) and Lasparaginase (GPR56, MAN1A1, CLEC11A, IGFBP7, GATA3) in order to better inderstand these mechanisms. Bone marrow samples of ALL patients, obtained at diagnosis, in four oncology centers and treated according to the Brazilian protocol (GBTLI-99). The relative mRNA expression levels were quantified using real-time PCR analysis. Amplification of the specific sequences was performed with SYBR® Green reagent; GUSB was used as the reference gene and normal bone marrow samples used as calibrator. The expression profile analisis showed important associations among the studied genes and clinical features as WBC count at diagnosis, CALLA, TEL/AML1 translocation and minimal residual disease. Among the analyzed genes, possible therapy targets were found at SHOC2 and GPR56. Further we addressed the expression profile of these genes in ALL patients, treated according to the BFM protocol, which chacarterize a group of distinct genetic\'s background. The results confirmed the data previously obtained. The overexpression of the gene SHOC2, that was primaraly associated to sensibility to dauborubicin, was related to patients who presented good prednisone response, suggesting the correlation of SHOC2 with good prognostic factors. In order to acess the interaction level of this gene, the protein expression was analyzed and confirmed the mRNA expression data. Despite its lack of information, the data on SHOC2 shows its role as na important element in the Erk activation by Ras induced pathway. Finally, to better understand the possible mechanisms which involve SHOC2 gene to the chemotherapy response process, Jurkat cells was transfect with siRNA to silence the gene SHOC2. Further, functional assays were done to characterize the mechanisms involved. The results showed the association of SHOC2 gene expression with processes of cell proliferation and apoptosis induction, thus suggesting that the overexpression of SHOC2 could play an important role in leukemic cell\'s sensibility to chemotherapy agents, and consequently in patients\' treatment outcome. In conclusion, this work demonstrated the association of the expression profile of many genes with important clinical and laboratorial features. Furthermore, this data present the gene SHOC2 as a possible therapy target to acute lymphoblastic leukemia \'s treatment.

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Libri sul tema "Shock profiles"

Karni, S. Viscous shock profiles and primitive formulations. Hampton, Va: Institute for Computer Applications in Science and Engineering, 1990.

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Karni, Shlomo. Viscous shock profiles and primitive formulations. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1990.

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Michael, Shearer, a cura di. Viscous profiles and numerical methods for shock waves. Philadelphia, Pa: Society for Industrial and Applied Mathematics, 1991.

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Isaac, Greber, e United States. National Aeronautics and Space Administration., a cura di. Molecular dynamics simulation of a piston driven shock wave in a hard sphere gas. [Washington, DC: National Aeronautics and Space Administration, 1995.

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Linfield, Kevin William. Experimental pressure and velocity profiles of simulated blast waves produced by a composite driver. [Downsview, Ont.]: Dept. of Aerospace Science and Engineering, University of Toronto, 1992.

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Linfield, Kevin William. Experimental pressure and velocity profiles of simulated blast waves produced by a composite driver. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1993.

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Adamovsky, Grigory. Laser beam propagation through inhomogeneous media with shock-like profiles: Modeling and computing. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Hughes, William O. Statistical analysis of a large sample size pyroshock test data set. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Hughes, William O. Statistical analysis of a large sample size pyroshock test data set. Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Hughes, William O. Statistical analysis of a large sample size pyroshock test data set. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Capitoli di libri sul tema "Shock profiles"

Serre, Denis. "Discrete Shock Profiles and Their Stability". In Hyperbolic Problems: Theory, Numerics, Applications, 843–53. Basel: Birkhäuser Basel, 1999. http://dx.doi.org/10.1007/978-3-0348-8724-3_35.

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Goudon, Thierry, Pauline Lafitte e Corrado Mascia. "Shock Profiles for Fluid-Particles Flows". In SEMA SIMAI Springer Series, 287–96. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55260-1_21.

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Swegle, J. W., e D. E. Grady. "Shock Viscosity and the Calculation of Steady Shock Wave Profiles". In Shock Waves in Condensed Matter, 353–57. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2207-8_48.

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Huot, Pierre. "On the Existence of Semidiscrete Shock Profiles". In Hyperbolic Problems: Theory, Numerics, Applications, 543–51. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8372-6_8.

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Pellhammer, Valentin. "Oscillating Shock Profiles in Relativistic Fluid Dynamics". In SEMA SIMAI Springer Series, 341–50. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55260-1_26.

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Taniguchi, Takashi, Ken-ichi Kondo e Akira Sawaoka. "Shock Waves Profiles in Powder Compacts of α Al203". In Shock Waves in Condensed Matter, 773–78. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2207-8_113.

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Caspar-Bauguil, Sylvie, e Michelle Genestal. "Plasma Phospholipid Fatty Acid Profiles in Septic Shock". In Diet and Nutrition in Critical Care, 1–16. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4614-8503-2_137-1.

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Mascia, C. "Stability and Instability Issues for Relaxation Shock Profiles". In Hyperbolic Problems: Theory, Numerics, Applications, 173–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75712-2_14.

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Caspar-Bauguil, Sylvie, e Michelle Genestal. "Plasma Phospholipid Fatty Acid Profiles in Septic Shock". In Diet and Nutrition in Critical Care, 219–33. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-7836-2_137.

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Mascia, Corrado, e Kevin Zumbrun. "One-Dimensional Stability of Viscous Shock and Relaxation Profiles". In Hyperbolic Problems: Theory, Numerics, Applications, 727–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55711-8_68.

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Atti di convegni sul tema "Shock profiles"

Boteler, J. Michael. "Shock wave profiles in polymer matrix composite". In Shock compression of condensed matter. AIP, 2000. http://dx.doi.org/10.1063/1.1303537.

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de Klerk, Rui, e José Beirão. "Parametric Design of Street Profiles". In eCAADe 2017 : ShoCK! – Sharing of Computable Knowledge! eCAADe, 2017. http://dx.doi.org/10.52842/conf.ecaade.2017.1.057.

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de Klerk, Rui, e José Beirão. "Parametric Design of Street Profiles". In eCAADe 2017 : ShoCK! – Sharing of Computable Knowledge! eCAADe, 2017. http://dx.doi.org/10.52842/conf.ecaade.2017.1.057.

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Abe, Akihisa. "Numerical Study on Shock Wave Profiles in 6061-T6 Aluminum Using Shock Viscous Stresses". In ASME 2002 Engineering Technology Conference on Energy. ASMEDC, 2002. http://dx.doi.org/10.1115/etce2002/cmda-29075.

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In order to accurately predict particle velocity profiles of steady shock wave fronts propagating in solid materials, a new numerical calculation method was proposed. The present method was based on one-dimensional Lagrangian finite difference wave code, and shock viscous stresses evaluated theoretically were introduced into the present numerical code. The shock viscous stress that is one of the important parameters to shape the rising profile of the shock wave front was calculated by the inside temperature estimate method for the steady shock wave fronts. The present calculation method was applied to the uniaxial strain problem of 6061-T6 aluminum at some stress levels below 8.86 GPa, where the elastic and plastic steady shock waves will appear. The results of the present calculation could reproduce more accurately the experimental data measured by the velocity interferometer system (VISAR). In addition, the present calculation was applied to a shock stress level of 20 GPa to investigate the shock viscous effects in the overdriven shock wave rising profile.

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Cheeseman, B. A., D. P. Dandekar, Mark Elert, Michael D. Furnish, William W. Anderson, William G. Proud e William T. Butler. "NUMERICAL SIMULATIONS OF LATERAL STRESS PROFILES". In SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2009. http://dx.doi.org/10.1063/1.3295273.

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Liu, Danny, Marc Mignolet e John Brandt. "Perturbed-Euler Similarity Profiles Supporting Attached Shock Waves". In 14th AIAA/AHI Space Planes and Hypersonic Systems and Technologies Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-7964.

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Menikoff, Ralph. "Compaction Wave Profiles in Granular HMX". In Shock Compression of Condensed Matter - 2001: 12th APS Topical Conference. AIP, 2002. http://dx.doi.org/10.1063/1.1483701.

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Zhao, Wei, Weiwei Luo, Qingjun Zhao e Jianzhong Xu. "Investigation on the Reduction of Trailing Edge Shock Losses for a Highly Loaded Transonic Turbine". In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56131.

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A shock loss reduction method for highly loaded transonic turbine blades with convergent passages is presented. The method is illustrated with an improved blade profile that employs a negative curvature curve on its uncovered suction side. The improved profile and a conventional baseline profile are applied to two cascades with the same solidity, chord and aspect ratio respectively. The numerical simulation results for the two cascades show that a reduction of 4.58% in the total pressure loss coefficient is obtained for the improved profile at the design condition. The effects of back pressures on the performance of both cascades are also presented, and the improved blade profile shows a much better part-load performance. The paper compares the flow fields of the baseline and the improved blade profiles to understand loss reduction mechanism especially by analyzing the shock interactions downstream of the trailing edge. It is found that, for the improved profile, the reflected shock of pressure side leg of the trailing-edge shock rotates forward and the suction side leg of the trailing-edge shock rotates backward. Therefore, the two shocks delay their intersection points where they merge into a relatively strong shock, and consequently produce less shock losses than those of the baseline profile.

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BLACKWELL, HARVEL, ERIC YUEN, CARL SCOTT e SIVARAM AREPALLI. "Nonequilibrium shock layer temperature profiles from arc jet radiation measurements". In 24th Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1989. http://dx.doi.org/10.2514/6.1989-1679.

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Bourne, N. K., e Z. Rosenberg. "Simultaneous manganin gauge and visar measurements of shock wave profiles". In The tenth American Physical Society topical conference on shock compression of condensed matter. AIP, 1998. http://dx.doi.org/10.1063/1.55600.

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Rapporti di organizzazioni sul tema "Shock profiles"

Grady, D. E., e R. L. Moody. Shock compression profiles in ceramics. Office of Scientific and Technical Information (OSTI), marzo 1996. http://dx.doi.org/10.2172/211375.

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Slemrod, Marshall, e Athanasios E. Tzavaras. Shock Profiles and Self-Similar Fluid Dynamic Limits. Fort Belvoir, VA: Defense Technical Information Center, dicembre 1994. http://dx.doi.org/10.21236/ada304652.

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Shearer, Michael. Viscous Profiles and Numerical Methods for Shock Waves. Fort Belvoir, VA: Defense Technical Information Center, giugno 1991. http://dx.doi.org/10.21236/ada238464.

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Shearer, Michael. Viscous Profiles and Numerical Methods for Shock Waves. Fort Belvoir, VA: Defense Technical Information Center, giugno 1991. http://dx.doi.org/10.21236/ada246110.

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Perry, William, e Malcolm Burns. Efficient connection of reactive shock wave profiles to reaction models. Office of Scientific and Technical Information (OSTI), ottobre 2021. http://dx.doi.org/10.2172/1826503.

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Warnes, R. H., e D. L. Tonks. Measurement and analysis of three 1.5-GPa shock-wave profiles in copper. Office of Scientific and Technical Information (OSTI), luglio 1993. http://dx.doi.org/10.2172/10165834.

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Desjardins, Tiffany, e John James Charonko. Additive Manufacturing Interface Profiles for Jet Studies on the Vertical Shock Tube. Office of Scientific and Technical Information (OSTI), marzo 2020. http://dx.doi.org/10.2172/1606338.

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Vigil, M. G. Plane Shock Generator Explosive Lens: PH 13-8 Mo stainless steel versus 4340 steel shock wave separators and LX-13 versus PBX-9501 explosive particle velocity-time profiles. Office of Scientific and Technical Information (OSTI), febbraio 1993. http://dx.doi.org/10.2172/6730164.

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Cazamias, J., D. Lassila, M. Shehadeh e H. Zbib. A Report on the use of Weak-Shock Wave Profiles and 3-D Dislocation Dynamics Simulations for Validation of Dislocation Multiplication and Mobility in the Phonon Drag Regime. Office of Scientific and Technical Information (OSTI), febbraio 2004. http://dx.doi.org/10.2172/15013922.

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Hixson, R. S., J. E. Vorthman, R. L. Gustavsen, A. K. Zurek, W. R. Thissell e D. L. Tonks. Spall wave-profile and shock-recovery experiments on depleted uranium. Office of Scientific and Technical Information (OSTI), novembre 1997. http://dx.doi.org/10.2172/548730.

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