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Search Results: 1 - 10 of 401445 matches for " Brodin M "
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Editorial
Brodin M
Revue Médicale de l'Assurance Maladie , 2006,
Abstract: Le Conseil scientifique de l’Assurance Maladie participe au soutien des recherches sur l’utilisation et l’organisation du système des soins. Ce soutien se traduit par le financement par l’Assurance Maladie de bourses de master II et de doctorat, ou un appui au développement de la recherche sur la médecine de première ligne ; il peut s’agir aussi d’appels d’offres ouverts ou de commandes ciblées. Les travaux rapportés dans ce numéro se réfèrent à trois préoccupations : le dépistage et la prévention, les évolutions de la profession de médecin, et quelques conséquences du vieillissement. A l’heure de la promotion de la loi de santé publique (ao t 2004), la Société fran aise de santé publique a réalisé un état des lieux des examens de prévention offerts en France à la population adulte ; ces examens sont nés au fil des années, à la suite de diverses réglementations institutionnelles, parfois redondantes. Les techniques de dépistage peuvent évoluer dans le temps ; pour le dépistage néonatal de la mucoviscidose, le développement d’une nouvelle stratégie alternative, techniquement et juridiquement plus simple est proposé. Le métier de médecin généraliste évolue ; la présentation ici retenue souligne comment sont per ues ou vécues ces évolutions ; le médecin traitant est en train de na tre. Le vieillissement est accompagné de son lot de complexités, qu’il s’agisse de dépendance source d’épuisement des aidants naturels, ou de démence éventuellement associée à une pathologie vasculaire. Le Conseil scientifique de l’Assurance Maladie vient d’être renouvelé. Les membres sortants ont souhaité livrer quelques unes de leurs réflexions, formulées sur la base de projets soumis à des fins de recherche de subventions pendant les trois années écoulées. Ces analyses portent sur l’utilisation des bases de données de consommation de l’Assurance Maladie, et sur la définition d’un panier de soins solidaires. Déjà, le nouveau Conseil scientifique définit ses repères – les mots-clefs sont : anticiper les évolutions techniques et organisationnelles dans la réalisation des soins – et suggère des choix pour l’amélioration de l’efficience de l’allocation des ressources de l’Assurance Maladie.
Spin quantum plasmas - new aspects of collective dynamics
M. Marklund,G. Brodin
Physics , 2008,
Abstract: Quantum plasmas is a rapidly expanding field of research, with applications ranging from nanoelectronics, nanoscale devices and ultracold plasmas, to inertial confinement fusion and astrophysics. Here we give a short systematic overview of quantum plasmas. In particular, we analyze the collective effects due to spin using fluid models. The introduction of an intrinsic magnetization due to the plasma electron (or positron) spin properties in the magnetohydrodynamic limit is discussed. Finally, a discussion of the theory and examples of applications is given.
Quantum, spin and QED effects in plasmas
G. Brodin,M. Marklund
Physics , 2008,
Abstract: Plasmas are usually described using classical equations. While this is often a good approximation, where are situations when a quantum description is motivated. In this paper we will include several quantum effects, ranging from particle dispersion, which give raise to the so called Bohm potential, to spin effects, and to quantum electrodynamical effects. The later effects appears when the field strength approaches the Schwinger critical field, which may occur in for example astrophysical systems. Examples of how to model such quantum effects will be presented, and the phenomena resulting from these models will be discussed.
Spin solitons in magnetized pair plasmas
G. Brodin,M. Marklund
Physics , 2007, DOI: 10.1063/1.2793744
Abstract: A set of fluid equations, taking into account the spin properties of the electrons and positrons in a magnetoplasma, are derived. The magnetohydrodynamic limit of the pair plasma is investigated. It is shown that the microscopic spin properties of the electrons and positrons can lead to interesting macroscopic and collective effects in strongly magnetized plasmas. In particular, it is found that new Alfvenic solitary structures, governed by a modified Korteweg-de Vries equation, are allowed in such plasmas. These solitary structures vanish if the quantum spin effects are neglected. Our results should be of relevance for astrophysical plasmas, e.g. in pulsar magnetospheres.
Spin magnetohydrodynamics
G. Brodin,M. Marklund
Physics , 2006, DOI: 10.1088/1367-2630/9/8/277
Abstract: Starting from the non-relativistic Pauli description of spin-1/2 particles, a set of fluid equations, governing the dynamics of such particles interacting with external fields and other particles, is derived. The equations describe electrons, positrons, holes, and similar conglomerates. In the case of electrons, the magnetohydrodynamic limit of an electron-ion plasma is investigated. The results should be of interest and relevance both to laboratory and astrophysical plasmas.
Dynamics of spin 1/2 quantum plasmas
M. Marklund,G. Brodin
Physics , 2006, DOI: 10.1103/PhysRevLett.98.025001
Abstract: The fully nonlinear governing equations for spin 1/2 quantum plasmas are presented. Starting from the Pauli equation, the relevant plasma equations are derived, and it is shown that nontrivial quantum spin couplings arise, enabling studies of the combined collective and spin dynamics. The linear response of the quantum plasma in an electron--ion system is obtained and analyzed. Applications of the theory to solid state and astrophysical systems as well as dusty plasmas are pointed out.
On the possibility of metamaterial properties in spin plasmas
G. Brodin,M. Marklund
Physics , 2008, DOI: 10.1088/1367-2630/10/11/115031
Abstract: The fluid theory of plasmas is extended to include the properties of electron spin. The linear theory of waves in a magnetized plasma is presented, and it is shown that the spin effects causes a change of the magnetic permeability. Furthemore, by changing the direction of the external magnetic field, the magnetic permability may become negative. This leads to instabilities in the long wavelength regimes. If these can be controlled, however, the spin plasma becomes a metamaterial for a broad range of frequencies, i.e. above the ion cyclotron frequency but below the electron cyclotron frequency. The consequences of our results are discussed.
Gravitational wave detection using electromagnetic modes in a resonance cavity
G. Brodin,M. Marklund
Physics , 2002,
Abstract: We present a proposal for a gravitational wave detector, based on the excitation of an electromagnetic mode in a resonance cavity. The mode is excited due to the interaction between a large amplitude electromagnetic mode and a quasi-monochromatic gravitational wave. The minimum metric perturbation needed for detection is estimated to the order 7.10^(-23) using current data on superconducting niobium cavities. Using this value together with different standard models predicting the occurrence of merging neutron star or black hole binaries, the corresponding detection rate is estimated to 1-20 events per year, with a `table top' cavity of a few meters length.
Ferromagnetic behavior in magnetized plasmas
G. Brodin,M. Marklund
Physics , 2007, DOI: 10.1103/PhysRevE.76.055403
Abstract: We consider a low-temperature plasma within a newly developed MHD Fluid model. In addition to the standard terms, the electron spin, quantum particle dispersion and degeneracy effects are included. It turns out that the electron spin properties can give rise to Ferromagnetic behavior in certain regimes. If additional conditions are fulfilled, a homogenous magnetized plasma can even be unstable. This happen in the low-temperature high-density regime, when the magnetic properties associated with the spin can overcome the stabilizing effects of the thermal and Fermi pressure, to cause a Jeans like instability.
Intraoperative Care of the Conscious Patient from the Perspective of the Operating Theatre Nurse: A Grounded Theory  [PDF]
Kerstin Brodin, Ove Hellzén, Marie H?ggstr?m
Open Journal of Nursing (OJN) , 2017, DOI: 10.4236/ojn.2017.79079
Abstract: Introduction: Intraoperative care includes a unique knowledge of how to perform a safe and effective surgery procedure. Surgery performed under regional or local anaesthesia allows the patient to remain conscious during the procedure and is rather common in Swedish healthcare today. Aim: The aim was to obtain a deeper understanding of the main concerns of operating theatre nurses (OTN) when caring for conscious patients during the intraoperative phase. Methods: Interviews were conducted with 23 OTNs from five different hospitals in Sweden and analysed according to grounded theory. Findings: The main concern among the OTNs was to take the patient in consideration. The core category “achieve and maintain ethical treatment of patients” in the operating theatre (OT) was a strategy used throughout the intraoperative process. Ethical treatment was described as moral behaviour at different levels and included the team’s behaviour, respectful and individualised patientcare, and the working-morale of the professionals. Being vigilant and being flexible were the categories related to the core category. The OTNs constantly assessed where to pay most attention as they balanced between the needs of the patient, the team, and the surgery procedure. Conclusion: It is important that every patient is taken into consideration and that ethical principles are held to the highest standards in the OT. A familiar team can facilitate that. The complex skills that operating theatre nurses develop can be added to explain important competencies within the profession.
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