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Добірка наукової літератури з теми "Effet MHD"

Автор: Grafiati
Опубліковано: 7 липня 2024
Оновлено: 7 липня 2024

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Статті в журналах з теми "Effet MHD":

1

Royani, J. I., H. Khairiyah, F. R. Mira, Karyanti, and N. Watanabe. "The effect of callus induction media for somatic embryo formation in Hevea brasiliensis Muell. Arg." IOP Conference Series: Earth and Environmental Science 1160, no. 1 (April 1, 2023): 012007. http://dx.doi.org/10.1088/1755-1315/1160/1/012007.

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Abstract The method for micro-propagation of rubber (Hevea brasiliensis Muell. Arg) by somatic embryo has been conducted. The aim of the research will describe the effect of media used for callus induction on the somatic embryo formation of rubber plants. Embryonic callus had been induction in 3 media, i.e.; MH1, MH2, and MH3. After callus induction, all callus were induced in media for embryo somatic expression. Maturation of cotyledons was performed using liquid media with filter paper as a bridge to absorb the media. The results showed that the percentage of callus was induced differently for each media. MH3 media was the best media for callus induction with 62.5% of callus forms, but for embryonic callus, MH1 was the best media. Not all of the calluses could be expressed to become somatic embryos. Most calluses derived from MH1 media were the best callus for somatic embryos formed.
2

Guha, Sanjib, and Niazur Rahim. "The effect of managerial horizon on cash holdings." Managerial Finance 45, no. 8 (August 12, 2019): 1092–110. http://dx.doi.org/10.1108/mf-09-2018-0442.

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Purpose US corporations are now sitting on an enormous stockpile of cash. Instead of investing their resources and creating jobs, the firms are holding on to excess cash. Academicians and practitioners alike have tried to fathom the reasons why companies are holding on to so much cash. Numerous studies have talked about the various motives for holding cash. Many researchers have tried to correlate excess cash holding with particular firm characteristics. The purpose of this paper is to study the correlations that exist between excess cash holding and some measurable managerial characteristics. Design/methodology/approach Four different measures of managerial horizon (MH) were constructed. The first two constructs (MH1 and MH2) are based on the CEO’s age and how long he has been the CEO of the company. The next two constructs (MH3 and MH4) are based on compensation, proportion of current compensation and proportion of future compensation. This paper tries to examine if MH has any impact on excess cash holding. Findings The results clearly show that the CEO age and the proportion of CEO’s compensation (current and future) do determine level of cash holding in the company. Younger CEOs hold more cash compared to older CEOs. Older CEOs hold less cash suggesting that as CEOs grow older they might be motivated by the idea of leaving a long lasting legacy. CEOs who receive more of their compensation in future payments also hold on to more cash, whereas CEOs who receive more of their compensation in current payments hold less cash. Originality/value There is no previous literature dealing with MH and cash holding by corporations.
3

Mogi, Iwao, and Kazuo Watanabe. "Chiral Recognition of Amino Acids by Magnetoelectrodeposited Cu Film Electrodes." International Journal of Electrochemistry 2011 (2011): 1–6. http://dx.doi.org/10.4061/2011/239637.

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Chiral behavior of magnetoelectrodeposited (MED) Cu film electrodes was investigated for the electrochemical reactions of amino acids. The Cu films were electrodeposited under a magnetic field of 5 T perpendicular to the electrode surface. Such MED Cu films were employed as an electrode, and cyclic voltammograms were measured for the electrochemical reactions of several kinds of amino acids. Chiral behavior was clearly observed as oxidation current difference between the enantiomers of alanine, aspartic acid, and glutamic acid. The MED film electrodes with the thickness of 50~500 nm exhibited such chiral behavior, and their surface morphologies had network structures, which could be induced by the micro-MHD effect.
4

Chowdhury, Kakali. "MHD Mixed Convective Nanofluid Flow: Effect of Heat Source and Corrugated Boundary." Nanomedicine & Nanotechnology Open Access 8, no. 3 (2023): 1–14. http://dx.doi.org/10.23880/nnoa-16000255.

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The problem of MHD mixed convection is analyzed in a lid driven cavity with corrugated wavy bottom wall filled with Cu-H2 O nanofluid in presence of internal heat source. The top and right walls of the cavity are maintained with a uniform cold temperature whereas the left wall and bottom wavy wall are kept adiabatic. The top wall is moving with a constant velocity upon its lid and a rectangular heat source is placed horizontally inside the cavity. The physical problem is characterized by 2D governing partial differential equations along with proper boundary conditions and are discretized using Galerkin’s finite element formulation. The study is executed by analyzing different ranges of geometrical, physical and nondimensional parameters namely, wave number of wavy surface (0 ≤ ≤ λ 4) , the ratio of heat source height and cavity height 1 3 1 20 a l  ≤ ≤      volume fraction of nanoparticle (0 ≤ ≤ ϕ 0.09) Hartmann number (0 ≤ ≤ Ha 90) and Richardson number (0.1≤ ≤ Ri 10) . The results indicate that heat transfer rate decreases with the increasing value of heat source height and cavity height ratio a L       . It decreases about 9% and 25% with the increasing ratio of a L from 1 20 to 1 10 and 1 5 respectively. It also reveals that heat transfer rate increases with the increasing value of wave number of corrugated wall. At Ri=1 and Ha=0 heat transfer rate increases about 9% and 16% with the increasing value of λ from 0 to 2 and 4 respectively for nanofluid with 6% of nanoparticle. Keywords: MHD; Nanoparticle; Nanofluid
5

Lansford, Jefferson L., Shengjie Chai, Gheath Alatrash, Jeffrey J. Molldrem, Paul M. Armistead, and Benjamin G. Vincent. "Integrated In Silico Prediction of Minor Histocompatibility Antigen Peptides in HLA-Matched Allogeneic Stem Cell Transplantation for Acute Myeloid Leukemia." Blood 128, no. 22 (December 2, 2016): 3352. http://dx.doi.org/10.1182/blood.v128.22.3352.3352.

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Abstract Background and Rationale: T-cell responses to minor histocompatibility antigens (mHA) are important drivers of the beneficial graft versus leukemia (GvL) effect and harmful graft versus host disease (GvHD) pathology following HLA-matched allogeneic stem cell transplantation (alloSCT). Despite their importance, Genome Wide Association Studies (GWAS) have failed to elicit a prognostic set of individual mHA associated with the clinically observed GvL and GvH effects of alloSCT [Sato-Otsubo et al. Blood 2015]. This is likely due to a lack of public mHA shared across the global set of donor/recipient pairs (DRPs). Even an optimally frequent single nucleotide polymorphism (SNP) would result in a recipient restricted genetic variant in only 24% of DRPs with a matched unrelated donor (MUD) or 17% of DRPs with a matched related donor (MRD) [Armistead et al. PLoS One 2011]. Moreover, even when DRPs do share a recipient restricted genetic variant, any resulting peptide would have to bind a MHC molecule within the recipient for presentation to T-cells. Methods: To evaluate the role of mHA in alloSCT without requiring public mHA, we developed a bioinformatics pipeline to predict mHA peptides based on SNP differences taking into account peptide/MHC binding estimated by netMHCpan [Nielson et al. Genome Med 2016] and expected GvL vs GvH tissue expression derived from mRNA sequencing data from acute myeloid leukemia (AML) and normal hematopoietic, hepatobiliary, skin, and gastrointestinal tract tissues. In order to understand the distribution of mHA in HLA-matched alloSCT drawn from a diverse pool of DRPs, we applied this analysis to putative DRPs drawn from healthy individuals who underwent whole-exome sequencing as part of the 1000 Genomes Project (n = 1,916) [1000 Genomes Project Consortium et al. Nature 2015]. To evaluate the association of mHA with AML relapse and GvHD incidence following alloSCT, we predicted mHA from SNP data using clinical information from an earlier study [Armistead et al. PLoS One 2011]. Results: To determine a baseline for the number of predicted mHA in an alloSCT, we considered every possible pair of samples in the 1000 Genomes data set as a theoretical alloSCT (n = 3,669,140). We determined each sample's HLA type using PHLAT [Bai et al. BMC Genomics 2014] and then performed mHA predictions for all theoretical transplants with a 10 out of 10 HLA match (n = 10). Within each ethnicity represented in the 1000 Genomes data, the degree of HLA matching was greater than that of all ethnicities pooled, with the lowest HLA diversity in the Finnish, Chinese, and Japanese populations. The number of predicted mHA binding MHC with Kd < 500nM ranged from 6,217 to 13,545 in the 1000 Genomes theoretical HLA-matched DRPs, with mHA contained in genes selectively expressed in AML versus those selectively expressed in GvH target organs numbering 213 to 610 and 367 to 1,135, respectively. HLA-A*02:01 restricted mHA were predicted for 37 actual DRPs in the context of MUD alloSCT and 97 DRPs from MRD alloSCT [Armistead et al. PLoS One 2011]. There were significantly more predicted mHA in MUD transplants (Figure 1). Taking into account both predicted peptide/MHC binding and tissue expression, the number of predicted GvL mHA was significantly associated with remission and the aggregate number of predicted GvH mHA was significantly associated with grade 2-4 GvHD incidence in MUD transplants (Figure 2). Conclusions: Prediction of mHA based on whole-exome sequencing data is feasible and can be used to discover associations of mHA distribution features with clinical outcomes including AML remission and GvHD incidence. Future work in larger datasets will be required to validate these predicted associations and guide development of mHA-directed therapeutics. Disclosures Molldrem: Astellas Pharma: Patents & Royalties.
6

Benkeblia, Noureddine. "Effect of maleic hydrazide on respiratory parameters of stored onion bulbs (Allium cepa L.)." Brazilian Journal of Plant Physiology 16, no. 1 (April 2004): 47–52. http://dx.doi.org/10.1590/s1677-04202004000100007.

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The respiration rate (RR) (CO2 production), activation energy (Ea) and Q10 of maleic hydrazide-treated onion bulbs (Allium cepa, cv. Rouge Amposta) at 20.10-6 mol.L-1 (MH1) and 45.10-6 mol.L-1 (MH2) were measured at 4, 10 and 20ºC. Immediately after treatment, the Q10 of MH-treated and control bulbs were not significantly different. After 8 weeks of storage, Q10 of control and both MH-treated bulbs increased and ranged from 2.34 and 2.89. Respiration rate of onions increased during storage, and after 24 weeks, RR values of control, MH1 and MH2 were 0.43, 0.32 and 0.26 mmol CO2.kg-1.h-1 at 20ºC respectively; and 0.26, 0.20 and 0.17 mmol CO2.kg-1.h-1 at 10ºC respectively. At 4ºC, no significant difference was observed between control and MH-treated bulbs. After 24 weeks, sprouting of the control and MH1 and MH2-treated bulbs was 75%, 38% and 33% at 20ºC respectively, and 50%, 22% and 17% at 10ºC respectively. At 4ºC, the sprouting level of control bulbs did not exceed 7% and was 5% for MH-treated bulbs. No difference was observed in rotting of control and MH-treated bulbs, and the low rotting observed at 4ºC could be attributed to low temperature rather than maleic hydrazide treatment.
7

Aslani, Kyriaki-Evangelia, Lefteris Benos, Efstratios Tzirtzilakis, and Ioannis E. Sarris. "Micromagnetorotation of MHD Micropolar Flows." Symmetry 12, no. 1 (January 10, 2020): 148. http://dx.doi.org/10.3390/sym12010148.

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The studies dealing with micropolar magnetohydrodynamic (MHD) flows usually ignore the micromagnetorotation (MMR) effect, by assuming that magnetization and magnetic field vectors are parallel. The main objective of the present investigation is to measure the effect of MMR and the possible differences encountered by ignoring it. The MHD planar Couette micropolar flow is solved analytically considering and by ignoring the MMR effect. Subsequently, the influence of MMR on the velocity and microrotation fields as well as skin friction coefficient, is evaluated for various micropolar size and electric effect parameters and Hartmann numbers. It is concluded that depending on the parameters’ combination, as MMR varies, the fluid flow may accelerate, decelerate, or even excite a mixed pattern along the channel height. Thus, the MMR term is a side mechanism, other than the Lorentz force, that transfers or dissipates magnetic energy in the flow direct through microrotation. Acceleration or deceleration of the velocity from 4% to even up to 45% and almost 15% deviation of the skin friction were measured when MMR was considered. The crucial effect of the micromagnetorotation term, which is usually ignored, should be considered for the future design of industrial and bioengineering applications.
8

Raptis, A., C. Perdikis, and H. S. Takhar. "Effect of thermal radiation on MHD flow." Applied Mathematics and Computation 153, no. 3 (June 2004): 645–49. http://dx.doi.org/10.1016/s0096-3003(03)00657-x.

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9

PALUMBO, L. J., and A. M. PLATZECK. "MHD stationary symmetric flows with Hall effect." Journal of Plasma Physics 72, no. 04 (December 8, 2005): 457. http://dx.doi.org/10.1017/s0022377805003958.

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10

Dang, Khyati, Vinita Makkar, and Naresh Sharma. "Mathematical Simulation for MHD Casson Convective Nanofluid Flow Induced by 3D Permeable Sheet with Chemical Effect." Indian Journal Of Science And Technology 17, no. 16 (April 19, 2024): 1713–23. http://dx.doi.org/10.17485/ijst/v17i16.117.

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Objectives: Current manuscript focuses on examination of chemical reaction and heat generation impacts on 3D MHD non-Newtonian nanofluid flow with convective boundary conditions induced by permeable sheet. Additionally, Brownian motion, non-Newtonian heating and thermophoretic processes as used for this study. Methods: A computational programme, MATLAB has been used for solving the system of O.D.Es with the help of ODE45 solver. The Runge Kutta Fehlberg approach is implemented to calculate the answer to the expression for temperature, velocity, and nanoparticle concentration after the shooting process. Findings: For a variety of fluid parameters, the temperature, concentration of nanoparticles, and dimensionless velocities are shown and examined, including permeability parameter , magnetic , stretching ratio parameter , Lewis number , Brownian motion and Prandtl number , thermal Biot number , Casson fluid parameter , chemical reaction parameter . The temperature is found to increase with an enhance in the thermal Biot number and to reduce with a greater Prandtl number and stretching ratio parameter. Novelty: Although the immense significance and frequent use of nanofluids in industries and technology, no effort has been made to explore the chemical influence on MHD Casson fluid flow using a three-dimensional permeable sheet. Through similarity transformations, the Runge-Kutta Fehlberg technique converts mass, momentum, and energy conservation equations into ODEs and incorporates boundary conditions. Skin friction and the heat transmission rate past an extending surface, which have an impact on technology and production, can be predicted using the results of this study. Keywords: Chemical reaction, Buongiorno's model, Nanofluid, Biot numbers, 3D permeable sheet
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Статті в журналах Дисертації Книги

Дисертації з теми "Effet MHD":

1

Chahine, Robert. "MHD simulations of the Reversed Field Pinch." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC056/document.

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La dynamique des plasmas de fusion par confinement magnétique dans la configuration Reversed Field Pinch (RFP) est ´étudiée en utilisant la description magnétohydrodynamique (MHD) incompressible. Une méthode pseudo-spectrale et une technique de pénalisation en volume sont utilisées pour résoudre le système d’équations dans un cylindre. Les simulations numériques montrent que la pression joue un rôle important dans la dynamique des RFP et ne peut pas être négligée. Ainsi, ß n’est plus le paramètre principal pour décrire la dynamique des RFPs mais plutôt ß’ ∇, un nouveau paramètre qui équivaut le rapport du module de gradient de pression et le module de la force de Lorentz. A un autre niveau, l’effet du changement de la section poloïdale du RFP sur la dynamique est étudié. Les simulations des écoulements RFP ayant le même nombre de Lundquist et des sections différentes (circulaire et elliptique), montrent une grande différence dans les spectres et la diffusion turbulente radiale. Finalement, les écoulements RFP sont utilisés pour étudier l’effet dynamo. Les résultats obtenus montrent que les écoulements RFP sont capables d’amplifier un champ magnétique passif qui aura une tendance à être plus non-linéaire que le champ magnétique du RFP dans les régimes turbulents
The dynamics of magnetic fusion plasmas in the Reversed Field Pinch (RFP) configuration are studied using an incompressible magnetohydrodynamics (MHD) description. A pseudospectral method combined with a volume penalization method are used to resolve the governing equations in a straight cylinder. Numerical simulations show that the pressure effects on the RFP dynamics cannot be neglected, and thus the _ parameter is not adequate to characterize the importance of pressure in the dynamics. A new parameter, _0r , which is the ratio of the pressure gradient’s magnitude to the Lorentz force’s magnitude, is proposed to be the proper parameter to describe the RFP dynamics. Another investigated influence on the RFP dynamics is the shaping of the poloidal cross-section. Simulations of flows with the same Lundquist number and different cross-sections (circular and elliptic) show a clear change in the spectral behaviour, as well as in the radial turbulent diffusion. Finally, the RFP flows are used to study the dynamo effect. Numerical results show that RFP flows are capable of amplifying a seed magnetic field, which will have tendency to be more nonlinear than the RFP magnetic field in the turbulent regime
2

Flutet, Vincent. "Etude numérique de la dynamique d'une couche limite turbulente avec effet MHD." Paris 6, 2007. http://www.theses.fr/2007PA066605.

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La turbulence est un phénomène présent dans la plupart des écoulements. A proximité d'une paroi, un de ses principaux effets est d'augmenter la traînée de l'écoulement. Il peut donc être intéressant d'affaiblir la turbulence afin de réduire la traînée. Différentes études ont montré que l'utilisation d'un champ magnétique pouvait affaiblir la turbulence. Dans un fluide conducteur en mouvement soumis à un champ magnétique se créent des forces qui s'opposent au mouvement. L'objectif de ce travail est d'étudier, dans des conditions subsoniques et supersoniques, l'effet du champ magnétique sur un canal plan turbulent, en particulier sur les structures cohérentes de la couche limite et sur la traînée de l'écoulement. Les résultats ont montré une augmentation de la sensibilité au champ magnétique avec la compressibilité. On observe aussi une réorganisation des structures cohérentes de la couche limite turbulente. Enfin, la présence du champ magnétique entraîne une participation à la traînée qui peut être compensée par une diminution de la traînée turbulente
Turbulence is a phenomenon present in most streams. Near a boundary, its main effect is to increase the stream drag. Thus it can be interesting to weaken turbulence in order to decrease drag. Several studies have shown that the use of a magnetic field could weaken turbulence. Indeed, in a conducting fluid moving under a magnetic fluid counter-movement forces appear. This study aims at determining, under both subsonic and supersonic conditions, the effect of a magnetic field on a turbulent channel flow, especially on coherent structures of the boundary layer and on drag. Results have shown an increase of the sensibility to the magnetic field with compressibility. Reorganisation of coherent structures of boundary layer is also shown. A last, magnetic field causes a participation to drag but causes to a decrease in turbulent drag that is more important
3

Tieriekhov, Kostiantyn. "Applications non-conventionnelles de champs magnétiques à séparation chirale et aux systèmes électrochimiques dynamiques." Electronic Thesis or Diss., Bordeaux, 2023. http://www.theses.fr/2023BORD0502.

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L’énantioséparation de précision est essentielle pour les industries pharmaceutiques et alimentaires. Les techniques conventionnelles de séparation chirale offrent un large éventail de méthodes, qui reposent toutes sur des sélecteurs chiraux - des phases stationnaires ou des molécules qui distinguent les énantiomères par une interaction stéréospécifique. Malgré le grand nombre de sélecteurs naturels et synthétiques actuellement utilisés, la demande croissante d’énantiopurité stimule la recherche de nouvelles méthodes polyvalentes.Le but de cette thèse est d'étudier des méthodes alternatives de séparation chirale impliquant l'application de champs magnétiques dans diverses configurations. Une idée est centrée sur le concept de vraie et fausse chiralité, introduit par L. Barron pour les systèmes dynamiques d'objets individuels et de grandeurs physiques vectorielles. Sa discussion indique explicitement que ni les champs magnétiques ni électriques statiques, ni aucune combinaison de ceux-ci, ne possèdent une véritable chiralité, la caractéristique requise pour induire une discrimination énantiomérique. Cependant, sa théorie suggère l’existence d’un analogue moléculaire de l’effet Faraday bien connu sous forme de l’application colinéaire d’un champ magnétique à un flux moléculaire.Alternativement, une configuration perpendiculaire au flux moléculaire impliquant un substrat ferromagnétique a démontré des interactions de spin énantiospécifiques, également connues sous le nom d'effet CISS. À cet égard, notre objectif principal était d’explorer une telle interaction dans des conditions dynamiques d’électrophorèse capillaire, qui permet une détection simple et rapide, tout en introduisant des substrats de Ni le long du flux de molécules et en appliquant un champ magnétique orthogonal.Enfin, la configuration orthogonale du champ magnétique a été exploitée pour étudier le comportement dynamique d'objets électropolarisés. Il a été démontré que la rotation présenté par différents objets sous l'effet magnétohydrodynamique induit par la force de Lorentz dépendent de la polarité du champ magnétique. Leur comportement dynamique en fonction du temps ressemble à celui de systèmes faussement chiraux
High-purity enantioseparation is essential for the pharmaceutical and food industries. Conventional chiral separation techniques provide a wide range of methods, all of which rely on chiral selectors - stationary phases or molecules that discriminate enantiomers through stereospecific interaction. Despite the vast number of natural and synthetic selectors currently in use, the increasing demand for enantiopurity is driving research for new and versatile methods.The aim of this thesis is to investigate alternative methods of chiral separation that involve the application of magnetic fields in various configurations. One idea centers around the concept of true and false chirality, which was introduced by L. Barron for dynamic systems of individual objects and physical vector quantities. His discussion explicitly states that neither static magnetic nor electric fields, nor any combination of those, possess true chirality, the feature required to induce enantiomeric discimination. However, his theory suggests a molecular analog of the well-known Faraday effect based on the collinear application of magnetic field to a molecular flow.Alternatively, a perpendicular configuration with the molecular flow involving a ferromagnetic substrate has demonstrated enantiospecific spin interactions, otherwise known as the CISS effect. In this regard, our main objective was the further exploration of such interactions in dynamic conditions of capillary electrophoresis, which provides simple and fast detection, while introducing Ni substrates along the flow of molecules and applying an orthogonal magnetic field.Lastly, the orthogonal configuration of the magnetic field was exploited to study the dynamic behavior of electropolarized objects. The patterns of the resulting rotation, exhibited by different objects under the influence of a magnetohydrodynamic effect, originating from the induced Lorentz force, are shown to be dependent on magnetic field polarity. Their dynamic behavior as a function of time resembles those of falsely chiral systems
4

Msellak, Khalid. "Electrodéposition métallique sous contrôle MHD : caractérisation physique et électrochimique." Reims, 2003. http://www.theses.fr/2003REIMS008.

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Ce travail analyse l'influence d'un champ magnétique parallèle à l'électrode sur deux systèmes électrochimiques d'intérêt industriel : le dépôt de Cu sur des substrats n'induisant aucune épitaxie et le dépôt d'alliages Ni-Fe. La caractérisation des dépôts a été menée avec un ensemble de techniques physiques et électrochimiques. Ses résultats montrent que : le champ magnétique ne modifie pas la nucléation de Cu sur un substrat conducteur (C vitreux ou Ti) : les seuls résultats mesurables sont les effets convectifs magnéto-induits sur la croissance de Cu. Sur TiO2, un phénomène d'anisotropie confirme l'existence d'un champ électrique transverse. Le phénomène, sensible avec des champs modérés, a été mis en évidence de façon spectaculaire sous les champs intenses disponibles au LCMI de Grenoble. En électrodéposition des alliages Ni-Fe, les résultats montrent que le champ magnétique augmente l'apport convectif des ions ferreux à l'électrode. Ces espèces inhibent le dépôt de Ni et conduisent à des alliages considérablement enrichis en Fe
This work analyzes the influence of a magnetic field parallel to the electrode on two electrochemical systems of industrial interest : the deposit of Cu on substrates inducing no epitaxy and deposits of Ni-Fe alloys. The characterization of the deposits was led with several physical and electrochemical techniques. The results show that : The magnetic field does not modify the nucleation of Cu on a conductive substrate (glassy C or Ti) : the only measurable results are the magneto-induced convective effects on the growth of Cu. On TiO2, a phenomenon of anisotropy confirms the existence of a transverse electric field. The phenomenon, sensitive with moderate fields, was put in evidence in a spectacular way under the intense fields available on the LMCI of Grenoble. For electrodeposition of Ni-Fe alloys, the results show that the magnetic field increases the convective rate of the ferrous ions to the electrode. These species inhibit the Ni deposit and lead to alloys considerably enriched in Fe
5

Riols-Fonclare, Antoine. "Effet dynamo et turbulence magnétohydrodynamique sous-critiques dans les disques d'accrétion." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/3242/.

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L'un des défis majeurs de la théorie des disques d'accrétion en astrophysique est de pouvoir identifier des mécanismes efficaces de transport de moment cinétique au sein de ces objets. Le scénario le plus crédible aujourd'hui est que ce transport est lié à l'existence de turbulence magnétohydrodynamique (MHD), initiée par une instabilité dite "magnétorotationnelle" (MRI), nécessitant la présence d'un champ magnétique. Ce problème soulève la question de l'origine et de l'entretien de ce champ au sein du disque. Un mécanisme de dynamo sous-critique non-linéaire, s'appuyant sur la MRI, pourrait permettre d'expliquer conjointement l'entretien de la turbulence MHD et du champ magnétique dans l'écoulement cisaillé képlérien. Des mécanismes similaires basés sur d'autres instabilités MHD pourraient également être à l'oeuvre dans les intérieurs stellaires. Les conditions physiques d'excitation de cette dynamo sont cependant mal compris. Des travaux numériques ont suggéré que celle-ci pourrait ne pas être entretenue à petit nombre de Prandtl magnétique (ratio entre viscosité et diffusivité magnétique), un régime assez commun dans les disques d'accrétion. Le but de cette thèse a été de mieux comprendre les conditions d'entretien de cette dynamo et le rôle joué par les effets dissipatifs dans la transition vers une turbulence MHD auto-entretenue. Pour cela, nous avons étudié en détail la nature de la transition et le rôle particulier des solutions périodiques non-linéaires tridimensionnelles. Nous avons d'abord montré que l'émergence d'activité chaotique associée à cette dynamo était due à la présence de bifurcations globales de tels cycles. Nous avons ensuite tenté d'élucider l'origine physique de la dépendance en Pm de la transition. Grâce à une analyse énergétique des cycles, nous avons mis en évidence qu'une forme de diffusion magnétique "turbulente" rend l'excitation de la dynamo plus difficile à petit Pm. Cet effet très générique pourrait s'opposer à l'activation de la dynamo dans les disques mais aussi limiter l'efficacité du transport de moment cinétique associé à la turbulence MRI à bas Pm
One of the main challenges of accretion disk theory in astrophysics is to identify efficient angular momentum transport mechanisms in disks. The most popular scenario is that this transport is due to the magnetohydrodynamic (MHD) turbulence triggered by the magnetorotational instability (MRI), which requires the existence of a magnetic field. This raises the question of the origin and sustainement of such a field in disks. A subcritical nonlinear dynamo process, involving the MRI, may be responsible for the joint excitation of MHD turbulence and magnetic fields in Keplerian shear flow. Similar dynamos driven by other MHD instabilities may also be active in stellar interiors. However, the detailed mechanisms underlying the excitation of the MRI dynamo are not well understood. Numerical results suggest that this mechanism may not be sustained at low magnetic Prandtl number (ratio between viscosity and magnetic diffusivity), a common dissipation regime in accretion disks. The purpose of this thesis has been to understand the physical conditions of excitation of this dynamo and the role of dissipative effects on the transition to self-sustained MHD turbulence. For this purpose, we investigated in detail the nature of the transition and the role of tridimensional nonlinear periodic solutions in this problem. First, we showed that the emergence of chaotic dynamo action is primarily associated with global bifurcations involving such cycles. We then attempted to elucidate the physical origin of the Pm dependence of the transition. Using a detailed energy analysis of several dynamo cycles, we found that "turbulent" diffusion makes the excitation of the dynamo increasingly difficult for decreasing Pm. This very generic effect could be an important determinant of MRI dynamo excitation in disks, and may also limit the efficiency of angular momentum transport by MRI turbulence at low Pm
6

Marchand, Pierre. "Étude des processus physiques de la formation d'étoiles par effondrement gravo-turbulent." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1154/document.

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La régulation du moment cinétique est l'une des questions les plus importantes dans la formation d'étoiles. Du nuage moléculaire à l'étoile finale, le système perd la grande majorité de son moment cinétique et plusieurs processus sont avancés pour l'expliquer. Nous nous concentrons sur la magneto-hydrodynamique (MHD) non-idéale, qui permet de décrire le couplage entre un champ magnétique et un fluide. Son efficacité pour réguler le moment cinétique dans des conditions réalistes a été montrée à plusieurs reprises. Dans un premier temps, nous développons un code qui calcule l'équilibre chimique d'éléments présents dans les premières étapes de la formation d'étoile. Ainsi, nous pouvons retrouver la valeur des coefficients définissant l'intensité de chaque processus de la MHD non-idéale. Nous nous intéressons ensuite à l'un d'entre eux, l'effet Hall, encore peu étudié dans ce contexte. Nous l'implémentons dans le code eulérien RAMSES, et l'utilisons pour quantifier son influence pendant un effondrement gravitationnel. Comme prévu par la théorie, l'effet Hall influence grandement la taille du disque protoplanétaire, dans lequel se forment les planètes, et crée des enveloppes de gas tournant en sens inverse du reste du système
The angular momentum regulation is a hot topic in star formation. From the molecular cloud to th final star, the system loses most of its angular momentum, and several processes are proposed to explain this phenomenon. We focus on non-ideal magnetohydrodynamics (MHD), which describes the coupling between a fluid and its magnetic field. Its efficiency to regulate the angular momentum in realistic conditions has been shown in several studies. First, we develop a code that computes the chemical equilibrium of elements present in the early stages of star formation. We can therefore obtain the values of coefficients defining the strength of the phyical processes associated with non-ideal MHD. We then take interest in one of them, the Hall effect, still poorly studied in this context. We implement it in the eulerian code RAMSES, and use it to quantify its influence during a gravitational collapse. As predicted by theory, the Hall effect greatly influences the size of the protoplanetary disk, in which planets form, and creates envelopes of gas rotating backward compared to the rest of the system
7

Leprovost, Nicolas. "Influence des petites échelles sur la dynamique à grande échelle en turbulence hydro et magnétohydrodynamique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2004. http://tel.archives-ouvertes.fr/tel-00007809.

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Dans cette thèse, nous nous intéressons à la modélisation des petites échelles de la turbulence afin d'obtenir des équations fermées pour les grandeurs à grande échelle (ou moyennées). Nous nous basons sur des modèles de type stochastique ou statistique afin d'étudier les trois problèmes suivants : - Les grandeurs globales dans un écoulement fortement turbulent, en turbulence hydrodynamique. En adoptant une paramétrisation stochastique des petites échelles, nous prédisons la distribution statistique du couple reçu par la turbulence. - l'effet dynamo engendé par un écoulement turbulent. Une modélisation stochastique permet de dériver une équation pour la distribution de probabilité du champ magnétique et d'identifier un seuil d'effet dynamo en présence de turbulence. - les états d'équilibre de la turbulence axisymétrique aussi bien hydrodynamique que magnétohydrodynamique. Nous les étudions via une approche de mécanique statistique.
8

Lessinnes, Thomas. "Magnetohydrodynamic turbulence modelling: application to the dynamo effect." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210042.

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La magnétohydrodynamique (MHD) est la science et le formalisme qui décrivent les mouvements d'un fluide conducteur d'électricité. Il est possible que de tels mouvements donnent lieu à l'effet dynamo qui consiste en la génération d'un champ magnétique stable et de grande échelle. Ce phénomène est vraisemblablement à l'origine des champs magnétiques des planètes, des étoiles et des galaxies.

Il est surprenant qu'alors que les mouvements fluides à l'intérieur de ces objets célestes sont turbulents, les champs magnétiques généré soient de grande échelle spatiale et stables sur de longues périodes de temps. De plus, ils peuvent présenter une dynamique temporelle régulière comme c'est le cas pour le champ magnétique solaire dont la polarité s'inverse tous les onze ans.

Décrire et prédire les mouvements d'un fluide turbulent reste l'un des problèmes les plus difficiles de la mécanique classique.

%La description aussi bien analytique que numérique d'un fluide hautement turbulent est d'une effroyable complexité, si pas tout simplement impraticable. Dans cette situation,

Il est donc utile de construire des modèles aussi proches que possible du système de départ mais de moindre complexité de sorte que des études théoriques et numériques deviennent envisageables.

Deux approches ont été considérées ici. D'une part, nous avons développé des modèles présentant un très petit nombre de degrés de liberté (de l'ordre de la dizaine). Une étude analytique est alors possible. Ces modèles ont une dépendance en les paramètres physiques - nombres de Reynolds cinétique et magnétique et injection d'hélicité - qualitativement similaire aux dynamos célestes et expérimentales.

D'autre part, les modèles en couches permettent de caractériser les transferts d'énergie entre les structures de différentes tailles présentes au sein du champ de vitesse. Nous avons développé un nouveau formalisme qui permet d'étudier aussi les échanges avec le champ magnétique.

De plus, nous proposons une étude de la MHD dans le cadre de la décomposition hélicoïdale des champs solénoïdaux - une idée similaire à la décomposition de la lumière en composantes polarisées et que nous sommes les premiers à appliquer à la MHD. Nous avons montré comment exploiter cette approche pour déduire systématiquement des modèles simplifiés de la MHD. En particulier, nos méthodes multiplient le nombre de situations descriptibles par les modèles en couche comme par exemple le problème anisotrope de la turbulence en rotation. Elles permettent aussi de construire des modèles à basse dimension en calquant les résultats de simulations numériques directes. Ces modèles peuvent alors être étudiés à moindre coûts.

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Magnetohydrodynamics (MHD) is both the science and the formalism that describe the motion of an electro-conducting fluid. Such motion may yield the dynamo effect consisting in the spontaneous generation of a large scale stationary magnetic field. This phenomenon is most likely the reason behind the existence of planetary, stellar and galactic magnetic fields.

\
Doctorat en Sciences
info:eu-repo/semantics/nonPublished

9

Giesecke, André. "Box-Simulationen von rotierender Magnetokonvektion im flüssigen Erdkern." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2007/1360/.

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Box-Simulationen von rotierender Magnetokonvektion im flüssigen Erdkern Numerische Simulationen der 3D-MHD Gleichungen sind mit Hilfe des Codes NIRVANA durchgeführt worden. Die Gleichungen für kompressible rotierende Magnetokonvektion wurden für erdähnliche Bedingungen numerisch in einer kartesischen Box gelöst. Charakteristische Eigenschaften mittlerer Größen, wie der Turbulenz-Intensität oder der turbulente Wärmefluss, die durch die kombinierte Wirkung kleinskaliger Fluktuationen entstehen, wurden bestimmt. Die Korrelationslänge der Turbulenz hängt signifikant von der Stärke und der Orientierung des Magnetfeldes ab, und das anisotrope Verhalten der Turbulenz aufgrund von Coriolis- und Lorentzkraft ist für schnellere Rotation wesentlich stärker ausgeprägt. Die Ausbildung eines isotropen Verhaltens auf kleinen Skalen unter dem Einfluss von Rotation alleine wird bereits durch ein schwaches Magnetfeld verhindert. Dies resultiert in einer turbulenten Strömung, die durch die vertikale Komponente dominiert wird. In Gegenwart eines horizontalen Magnetfeldes nimmt der vertikale turbulente Wärmefluss leicht mit zunehmender Feldstärke zu, so dass die Kühlung eines rotierenden Systems verbessert wird. Der horizontale Wärmetransport ist stets westwärts und in Richtung der Pole orientiert. Letzteres kann unter Umständen die Quelle für eine großskalige meridionale Strömung darstellen, während erstes in globalen Simulationen mit nicht axialsymmetrischen Randbedingungen für den Wärmefluss von Bedeutung ist. Die mittlere elektromotorische Kraft, die die Erzeugung von magnetischem Fluss durch die Turbulenz beschreibt, wurde unmittelbar aus den Lösungen für Geschwindigkeit und Magnetfeld berechnet. Hieraus konnten die entsprechenden α-Koeffizienten hergeleitet werden. Aufgrund der sehr schwachen Dichtestratifizierung ändert der α-Effekt sein Vorzeichen nahezu exakt in der Mitte der Box. Der α-Effekt ist positiv in der oberen Hälfte und negativ in der unteren Hälfte einer auf der Nordhalbkugel rotierenden Box. Für ein starkes Magnetfeld ergibt sich zudem eine deutliche abwärts orientierte Advektion von magnetischem Fluss. Ein Mean-Field Modell des Geodynamos wurde konstruiert, das auf dem α-Effekt basiert, wie er aus den Box-Simulationen berechnet wurde. Für eine äußerst beschränkte Klasse von radialen α-Profilen weist das lineare α^2-Modell Oszillationen auf einer Zeitskala auf, die durch die turbulente Diffusionszeit bestimmt wird. Die wesentlichen Eigenschaften der periodischen Lösungen werden präsentiert, und der Einfluss der Größe des inneren Kerns auf die Charakteristiken des kritischen Bereichs, innerhalb dessen oszillierende Lösungen auftreten, wurden untersucht. Reversals werden als eine halbe Oszillation interpretiert. Sie sind ein recht seltenes Ereignis, da sie lediglich dann stattfinden können, wenn das α-Profil ausreichend lange in dem periodische Lösungen erlaubenden Bereich liegt. Aufgrund starker Fluktuationen auf der konvektiven Zeitskala ist die Wahrscheinlichkeit eines solchen Reversals relativ klein. In einem einfachen nicht-linearen Mean-Field Modell mit realistischen Eingabeparametern, die auf den Box-Simulationen beruhen, konnte die Plausibilität des Reversal-Modells anhand von Langzeitsimulationen belegt werden.
Box-simulations of rotating magnetoconvection in the Earth's fluid core. Simulations of the 3D MHD-equations have been performed using the code NIRVANA. The equations for compressible rotating magnetoconvection are numerically solved in a Cartesian box assuming conditions roughly suitable for the geodynamo. The characteristics of averaged quantities like the turbulence intensity and the turbulent heat flux that are caused by the combined action of the small-scale fluctuations are computed. The correlation length of the turbulence significantly depends on the strength and orientation of the magnetic field and the anisotropic behavior of the turbulence intensity induced by Coriolis and Lorentz force is considerably more pronounced for faster rotation. The development of an isotropic behavior on the small scales -- as it is observed in pure rotating convection -- vanishes even for weak magnetic fields, which results in a turbulent flow that is dominated by the vertical component. In the presence of a horizontal magnetic field the vertical turbulent heat flux slightly increases with increasing field strength, so that cooling of the rotating system is facilitated. Horizontal transport of heat is always directed westwards and towards the poles. The latter might be a source of a large-scale meridional flow whereas the first would be important in global simulations in case of non-axisymmetric boundary conditions for the heat flux. The mean electromotive force describing the generation of mean magnetic flux by turbulence in the rotating fluid is directly calculated from the simulations and the corresponding α-coefficients are derived. Due to the very weak density stratification, the α-effect changes its sign in the middle of the box. It is positive at the top and negative at the bottom of the convective instable layer. For strong magnetic fields we also find a clear downward advection of the mean magnetic field. Finally the quenching behavior of the α-effect in dependence of the imposed magnetic field strength is presented. A geodynamo-model is constructed, which is based on an α-effect that has been computed from the box simulations. For a highly restricted class of radial α-profiles the linear α^2-model exhibits oscillating solutions on a timescale given by the turbulent diffusion time. The basic properties of the periodic solutions are presented and the influence of the inner core size on the characteristics of the critical range that allows for oscillating solutions is shown. Reversals are interpreted as half of such an oscillation. They are rather seldom events because they can only occur if the α-profile exists long enough within the small critical range that allows for periodic solutions. Due to strong fluctuations on the convective timescale the probability of such a reversal is very small. Finally, a simple non-linear mean-field model with reasonable input parameters based on the box-simulations demonstrates the plausibility of the presented theory with a long-time series of a (geo-)dynamo reversal sequence.
10

Persson, Åsa, and Bengt Sundberg. "Effekter av utbildning till personer som lever med epilepsi : en litteraturöversikt." Thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ, Avd. för omvårdnad, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-23959.

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Bakgrund: Att leva med epilepsi leder till ökad psykisk belastning. Personer med epilepsi har ofta bristande kunskap om sjukdomen och behovet av utbildning är stort. Personen behöver lära sig symtom och sätt att undvika situationer som kan trigga anfall. Vårdpersonal har en viktig roll när det gäller utbildning, rådgivning och stöd till personer med epilepsi och deras familjer. Syftet med denna litteraturöversikt var att beskriva och utvärdera effekter av utbildning till personer med epilepsi och/eller dennes närstående. För att besvara detta valdes litteraturöversikt som metod bestående av vetenskapliga artiklar med kvantitativ ansats. Resultatet visade att det framgångsrikt går att utbilda personer och/eller dess närstående i kunskap om epilepsi och egenvårdsförmåga. Livskvalitén för personer med epilepsi tycks dock inte påverkas av utbildning. Slutsatsen var att utbildning tycks ha en god effekt för personer med epilepsi avseende kunskap och egenvårdsförmåga. Vidare forskning med randomiserad, kontrollerade studier med större urval skulle vara av stort värde för att öka kunskapen om effekter av utbildning vid epilepsi ytterligare.
Background: Living with epilepsy leads to increased psychological stress. People with epilepsy often have insufficient knowledge about the disease and the need for education is essential. The person needs to learn the symptoms and ways to avoid exposing themselves to situations that may trigger seizures. Health professionals have an important role in education, counseling and support to people with epilepsy and their families. The aim of this literature overview was to describe and evaluate the effects of education to people with epilepsy and / or its family. To answer this, a literature overview was selected as a method consisting of scientific articles with a quantitative approach. The result showed that to educate individuals and / or its family in the knowledge of epilepsy and self-care ability could be successfully be carried out. Quality of life in people with epilepsy does not seem to get effect of patient education.   The conclusion was that education seems to have positive effect for people with epilepsy on knowledge and self-care ability. Continued research with randomized, controlled trials with larger sample would be of great value to further increase the knowledge about the effects of education in people living with epilepsy.
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Книги з теми "Effet MHD":

1

Goreham, Steve. The mad, mad, mad world of climatism: Mankind and climate change mania. New Lenox, IL: New Lenox Books, 2013.

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Hoxter, Holly Nicole. The Snowball Effect. New York: HarperCollins, 2010.

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Health Effects Research Laboratory (Research Triangle Park, N.C.), ed. Cerebellar histogenesis in rats exposed to 2450 MHz microwave radiation: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Health Effects Research Laboratory, 1988.

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Health Effects Research Laboratory (Research Triangle Park, N.C.), ed. Cerebellar histogenesis in rats exposed to 2450 MHz microwave radiation: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Health Effects Research Laboratory, 1988.

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5

1935-, Gandhi Om P., and Health Effects Research Laboratory (Research Triangle Park, N.C.), eds. Behavior, physiology, and energy deposition in rats chronically exposed to 2450 MHz radiation: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Health Effects Research Laboratory, 1988.

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1935-, Gandhi Om P., and Health Effects Research Laboratory (Research Triangle Park, N.C.), eds. Behavior, physiology, and energy deposition in rats chronically exposed to 2450 MHz radiation: Project summary. Research Triangle Park, NC: U.S. Environmental Protection Agency, Health Effects Research Laboratory, 1988.

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7

Bornmalm-Jardelöw, Gunilla. Högre utbildning och arbetsmarknad: En studie med tillämpningar på svenska förhållanden. [Gothenburg: Nationalekonomiska institutionen, Handelshögskolan vid Göteborgs universitet, 1988.

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8

Overrein, Øystein. Virkninger av motorferdsel på fauna og vegetasjon: Kunnskapsstatus med relevans for Svalbard. Tromsø: Norsk Polarinstitutt, 2002.

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9

Mitchell, Juliet. Mad men and Medusas: Reclaiming hysteria and the effect of sibling relationships on the human condition. London: Penguin, 2000.

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Mitchell, Juliet. Mad men and Medusas: Reclaiming hysteria and the effect of sibling relationships on the human condition. London: Allen Lane The Penguin Press, 2000.

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Частини книг з теми "Effet MHD":

1

Ferrone, S., M. De Felice, M. C. Turco, L. Corbo, and S. Venuta. "Effect of Anti-HLA Class I Monoclonal Antibodies on the Proliferation of T Cells Induced by PHA-P. Comparison with the Effect on T Cell Activation via the CD2 and CD3 Pathways." In MHC + X, 100–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-74026-8_16.

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Ahmed, Nazibuddin. "MHD Flow with Soret Effect and Induced Magnetic Field." In Thermal and Solutal Convection in Some Hydromagnetic Flows, 69–91. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-7153-2_4.

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Liao, Yingke, Guiping Zhu, and Jie Wang. "Numerical Simulation of the Electrode Degradation Effect on Faraday MHD Accelerator." In 2023 Asia-Pacific International Symposium on Aerospace Technology (APISAT 2023) Proceedings, 158–67. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4010-9_12.

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Houerou, H. N. "Global Change: Population, Land-Use and Vegetation in the Mediterranean Basin by the Mid-21st Century." In Greenhouse Effect, Sea Level and Drought, 301–67. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0701-0_19.

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Bojarevics, Valdis. "MHD of Aluminium Cells with the Effect of Channels and Cathode Perturbation Elements." In Light Metals 2013, 609–14. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663189.ch104.

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Bojarevics, Valdis. "Effect of Cathode Collector Copper Inserts on the Hall-Héroult Cell MHD Stability." In Light Metals 2016, 933–38. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48251-4_157.

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Bojarevics, Valdis. "Effect of Cathode Collector Copper Inserts on the Hall-HéRoult Cell MHD Stability." In Light Metals 2016, 933–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274780.ch157.

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Bojarevics, Valdis. "MHD of Aluminium Cells with the Effect of Channels and Cathode Perturbation Elements." In Light Metals 2013, 609–14. Cham: Springer International Publishing, 2003. http://dx.doi.org/10.1007/978-3-319-65136-1_104.

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9

Singh, Alok, Savita Singh, and Sudhir Kumar Sharma. "Mathematical Modeling: Magnetic Field Effect on Oscillatory MHD Couette Two Dimensional Flow Regime." In Lecture Notes in Mechanical Engineering, 439–49. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8517-1_33.

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Ahmed, Nazibuddin, and Bijoy Krishna Taid. "MHD Forced Convection from an Infinite Horizontal Porous Plate with Thermal Diffusion Effect." In Advances in Intelligent Systems and Computing, 253–68. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8054-1_14.

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Тези доповідей конференцій з теми "Effet MHD":

1

Frisbie, C. Daniel. "Electrolyte gated transistors and inverters operating at 10 MHz (Conference Presentation)." In Organic and Hybrid Field-Effect Transistors XXI, edited by Oana D. Jurchescu and Iain McCulloch. SPIE, 2022. http://dx.doi.org/10.1117/12.2633938.

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Litwin, C. "Microinstabilities effect on MHD modes." In Radio−frequency power in plasmas. AIP, 1989. http://dx.doi.org/10.1063/1.38490.

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Krasilnikov, Arthur, Valeriy Knotko, and Valentin Bityurin. "MHD Effect Study at High Frequency Plasmatron." In 42nd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1198.

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Hamba, Fujihiro. "DYNAMO EFFECT IN MHD TURBULENT CHANNEL FLOW." In Sixth International Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2009. http://dx.doi.org/10.1615/tsfp6.1110.

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Singh, Ranjit J., and Trushar Gohil. "EFFECT OF MHD ON RAYLEIGH-BENARD CONVECTION." In Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017). Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihmtc-2017.2650.

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Shalybkov, Dima. "Taylor-Couette flow stability: effect of vertical density stratification and azimuthal magnetic fields." In MHD COUETTE FLOWS: Experiments and Models. AIP, 2004. http://dx.doi.org/10.1063/1.1832146.

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Anwari, Makbul, and Sukarsan. "Effect of magnetic field on a Diagonal MHD Accelerator." In 2008 IEEE Vehicle Power and Propulsion Conference (VPPC). IEEE, 2008. http://dx.doi.org/10.1109/vppc.2008.4677759.

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Lin, Zuowei, Yan Peng, Lingzhi Zhao, Ciwen Sha, Yuyu Xu, Ran Li, and Jason Jia. "Analytical Study on End Effect of Liquid Metal MHD Generator." In 38th Plasmadynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-4514.

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Munipalli, Ramakanth, Shashi Aithal, and Vijaya Shankar. "Effect of Wall Conduction in Proposed MHD Enhanced Hypersonic Vehicles." In 12th AIAA International Space Planes and Hypersonic Systems and Technologies. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-6921.

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Parent, Bernard, Prasanna T. Rajendran, Robert W. Moses, Christopher O. Johnston, F. M. Cheatwood, Sergey O. Macheret, and Justin Little. "Effect of Plasma Sheaths on Earth Re-entry MHD Processes." In AIAA SCITECH 2022 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2022. http://dx.doi.org/10.2514/6.2022-0980.

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Звіти організацій з теми "Effet MHD":

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R.B. White, Ya.I. Kolesnichenko, V.V. Lutsenko, and V.S. Marchenko. Effect of Trapped Energetic Ions on MHD Activity in Spherical Tori. Office of Scientific and Technical Information (OSTI), May 2002. http://dx.doi.org/10.2172/798181.

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Chu, M. S., J. M. Greene, T. H. Jensen, R. L. Miller, A. Bondeson, R. W. Johnson, and M. E. Mauel. Effect of toroidal plasma flow and flow shear on global MHD modes. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/10118062.

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Ono, M., D. Stutman, and Y. S. Hwang. Investigation of the effect of resistive MHD modes on spherical torus performance in CDX-U. Office of Scientific and Technical Information (OSTI), January 1997. http://dx.doi.org/10.2172/304212.

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Li, wanlin, jie Yun, siying He, ziqi Zhou, and ling He. Effect of different exercise therapies on fatigue in maintenance hemodialysis patients:A Bayesian Network Meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, November 2022. http://dx.doi.org/10.37766/inplasy2022.11.0144.

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Review question / Objective: Population: maintenance hemodialysis patients. Intervention: exercise therapy (resistance exercise； aerobic exercise； resistance combined aerobic exercise； muscle relaxation training； Baduanjin ). Comparison: simple routine nursing. Outcome: fatigue； sleep quality. Study design: randomized controlled trial. Eligibility criteria: Inclusion and exclusion criteria： RCT of study type exercise intervention in MHD patients' fatigue； Study subjects： MHD patients ≥18 years old, regardless of gender, nationality or race； The intervention measures were exercise therapy, including resistance exercise, aerobic exercise, resistance combined aerobic exercise, Baduanjin, muscle relaxation training, etc. The control group was conventional nursing measures or the comparison of the above exercise therapy； Outcome indicators： The primary outcome indicator was fatigue score, and the secondary outcome indicator was sleep quality score； Exclusion criteria： Literature using non-exercise intervention; Non-Chinese and English documents; Unable to obtain the full text or repeated publication of literature; The data cannot be extracted or the extraction is incomplete; There are serious defects in the design of the research experiment.
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Natesan, K. Characterization of deposits and effect of deposits on corrosion of materials for MHD balance-of-plant applications. Office of Scientific and Technical Information (OSTI), December 1993. http://dx.doi.org/10.2172/142545.

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Nelson, Gena, Angela Crawford, and Jessica Hunt. A Systematic Review of Research Syntheses for Students with Mathematics Learning Disabilities and Difficulties. Boise State University, Albertsons Library, January 2022. http://dx.doi.org/10.18122/sped.143.boisestate.

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The purpose of this document is to provide readers with the coding protocol that authors used to code 36 research syntheses (including meta-analyses, evidence-based reviews, and quantitative systematic reviews) focused on mathematics interventions for students with learning disabilities (LD), mathematics learning disabilities (MLD), and mathematics difficulties (MD). The purpose of the systematic review of mathematics intervention syntheses was to identify patterns and gaps in content areas, instructional strategies, effect sizes, and definitions of LD, MLD, and MD. We searched the literature for research syntheses published between 2000 and 2020 and used rigorous inclusion criteria in our literature review process. We evaluated 36 syntheses that included 836 studies with 32,495 participants. We coded each synthesis for variables across seven categories including: publication codes (authors, year, journal), inclusion and exclusion criteria, content area focus, instructional strategy focus, sample size, methodological information, and results. The mean interrater reliability across all codes using this coding protocol was 90.3%. Although each synthesis stated a focus on LD, MLD, or MD, very few students with LD or MLD were included, and authors’ operational definitions of disability and risk varied. Syntheses predominantly focused on word problem solving, fractions, computer- assisted learning, and schema-based instruction. Syntheses reported wide variation in effectiveness, content areas, and instructional strategies. Finally, our results indicate the majority of syntheses report achievement outcomes, but very few syntheses report on other outcomes (e.g., social validity, strategy use). We discuss how the results of this comprehensive review can guide researchers in expanding the knowledge base on mathematics interventions. The systematic review that results from this coding process is accepted for publication and in press at Learning Disabilities Research and Practice.
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D.I. Simon, E. Marmar, N.L. Bretz, R. Bravenec, and R.F. Parsells. Optical and Mechanical Design of C-Mod Motional Stark Effect Diagnostic. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/14501.

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Adamovich, Igor V. Experimental and Computational Study of the Effect of MHD Forces on Stability and Separation of Nonequilibrium Ionized Supersonic Flow. Fort Belvoir, VA: Defense Technical Information Center, July 2005. http://dx.doi.org/10.21236/ada437407.

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Nadeau, Elisabet, Andrea von Essen, and Anne Kjersti Bakken. Effekt av kvävegödslingsstrategi på gräsvallens avkastning och foderkvalitet vid olika utvecklingsstadier i första skörd. Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences, 2024. http://dx.doi.org/10.54612/a.38e4a3v12l.

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Syftet med projektet var att studera effekt av delad kväve(N)-giva och tidpunkt för den sena N-givan innan första skörd på avkastning, kvävebalans och fodervärde med speciellt fokus på råproteinhalt och råproteinets kvalitet i en timotej/ängssvingel vall. En vallfröblandning med 80 % timotej och 20 % ängssvingel såddes 2017 på NIBIO Kvithamar, Trondheim och 2018 på NIBIO Særheim, Stavanger, Norge och på Rådde gård, Länghem, Sverige (Hushållningssällskapet Sjuhärad). En yta av den sådda arealen skördades som förstaårsvall 2018 på NIBIO Kvithamar och som förstaårsvall 2019 på NIBIO Særheim och Rådde gård. En annan yta av den sådda arealen skördades som andraårsvall 2019 på NIBIO Kvithamar och som andraårsvall 2020 på NIBIO Særheim och Rådde. Försöksdesignen var randomiserat blockförsök med 3 fältblock, 4 gödslingsbehandlingar och 3 skördetidpunkter i första skörd. Gödslingsbehandlingarna var A) ingen N-gödsling, B) 110 kg N/ha på våren när grästillväxten började, C) 60 kg N/ha på våren när grästillväxten började och 50 kg N/ha när första noden känns på första timotejplantan, D) 60 kg N/ha på våren när grästillväxten började och 50 kg N/ha när två noder känns på största delen av timotejskotten. Samtliga försöksrutor gödslades med P och K på våren när grästillväxten började och mineralgödsel användes i samtliga led. Skördetidpunkterna var 1) vid början av stjälksträckning hos timotej då första noden var kännbar på första skotten, 2) när två noder var kännbara på största delen av timotejskotten och 3) vid begynnande axgång hos timotej när axet syntes på 10 % av skotten. Dessutom togs en skörd fyra veckor efter första skörd på de rutor som skördades vid skördetidpunkt 3, för att undersöka hur mycket kväve som var tillgänglig och kunde mobiliseras till återväxten. N-gödsling ökade råproteinhalten och den skördade avkastningen av torrsubstans (ts) och råprotein. Delad N-giva gav lika råproteinhalt som vid full giva på våren, men då andra givan gavs sent (ca 2 veckor innan skörd) var ofta ts-avkastningen oförändrad eller till och med lägre, vilket var fallet på Rådde och Kvithamar år 2. Tiden för den sena N-givan hade mindre betydelse for Særheim och Kvithamar i Norge, vilket kan bero på att gräsen tog upp mer N från jorden. Den sena N-givan som gavs ca 2 veckor innan skörd vid timotejens begynnande axgång visade sig ge effekt på ts-avkastningen i återväxten. Med tanke på att både väder och jordens N-innehåll kan påverka hur fort grödan tar upp N för att lagra in till sin tillväxt bör den andra givan ges 3-4 veckor innan skörd. Delad N-giva förbättrade inte proteinkvaliteten i form av större andel sant protein jämfört med full giva på våren, vilket kan bero på att en N-giva på 110 kg N/ha är en måttlig giva som gräsvallen hinner ta upp och lagra in som sant protein. Det var inga skillnader i nitrathalt mellan N-gödslingsstrategierna och nitrathalterna var låga, vilket visar på att växterna har omvandlat N från gödsel och jord till sant protein. Vi hittade få och små indikationer på att delad giva gav lägre N-förluster än en hel giva på våren. Med stigande gödselpriser och större svängningar i vädret kan det vara en fördel med delad giva, men det ger också en körning till i vallen.
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Jeppsson, Knut-Håkan, Madeleine Magnusson, Sara Bergström Nilsson, Lisa Ekman, Louise Winblad von Walter, Lars-Erik Jansson, Håkan Landin, and Christer Bergsten. Fiberströ till mjölkkor – effekt på djurvälfärd, djurhälsa, mjölkkvalitet och kostnaden för strömedel. Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap, Sveriges lantbruksuniversitet, 2023. http://dx.doi.org/10.54612/a.5nqtckgl7i.

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Genom att separera gödseln får man gödselfiber (fiberströ) som kan användas som strömedel till mjölkkorna. I denna studie jämförde vi 17 gårdar som använde fiberströ med 17 gårdar som använde såg-/kutterspån som strömedel i liggbås till mjölkkor. Fiberströ jämfört med såg-/kutterspån påverkade inte mjölkmängd, celltal i tankmjölk, djurvälfärd eller djurhälsa förutom att klövhälsan var bättre eftersom totala anmärkningar, klöveksem och klövsulesår var lägre. Totalantalet bakterier var högre i oanvänt fiberströ och i fiberströ från liggbåsen än för såg-/kutterspån men i tankmjölken var det ingen skillnad. Kostnaden för fiberströ varierade för gårdarna beroende på hur mycket fiberströ som producerades.

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