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Literatura académica sobre el tema "Magnetisk resonans"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Magnetisk resonans"

SARGSYAN, A., G. HAKHUMYAN, R. MIRZOYAN, A. PAPOYAN, D. SARKISYAN, C. LEROY y Y. PASHAYAN-LEROY. "SELECTIVE AMPLIFICATION OF NARROW RESONANCE FORMED IN TRANSMISSION SPECTRUM OF Rb NANO-CELL IN MAGNETIC FIELD". International Journal of Modern Physics: Conference Series 15 (enero de 2012): 9–15. http://dx.doi.org/10.1142/s2010194512006897.

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Recently it was shown that "λ-Zeeman Technique" (λ-ZT) is a convenient tool to study individual transitions between the Zeeman sublevels of hyperfine levels in an external magnetic field. λ-ZT is based on resonant transmission spectrum of nanometric thin cell (NTC) of thickness L = λ, where λ is the resonant wavelength 794 nm for Rb D1 line. Narrow velocity selective optical pumping (VSOP) resonances in the transmission spectrum of the NTC are split into several components in a magnetic field. Examination of VSOP resonances allows one to identify and investigate an atomic transition in the range of magnetic fields 10 - 5000 G. Here we present a new method for selective addressing of VSOP resonance amplification (more than 10 times).

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Карпунин, В. В. y В. А. Маргулис. "Резонансное поглощение электромагнитного излучения в монослое фосфорена". Журнал технической физики 53, n.º 4 (2019): 474. http://dx.doi.org/10.21883/ftp.2019.04.47443.8944.

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AbstractThe absorption coefficient of the electromagnetic radiation in a phosphorene single layer placed in a magnetic field is found. A degenerate and nondegenerate electron gas is considered. The resonant dependences of the absorptance on the radiation frequency and applied magnetic field are found. Taking into account electron scattering at an ionized impurity leads to oscillation dependences of the absorption coefficient on the radiation frequency and external magnetic field. The resonance character of the absorption curve is shown. The conditions of resonances and position of resonance peaks are found.

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Шварцбург, А. Б., Л. М. Василяк, С. П. Ветчинин, К. В. Алыбин, О. Д. Вольпян, Ю. А. Обод, В. Я. Печеркин, П. А. Привалов y Д. В. Чуриков. "Резонансное рассеяние плоских электромагнитных волн ГГЦ диапазона кольцевыми диэлектрическими линейными структурами". Оптика и спектроскопия 129, n.º 2 (2021): 214. http://dx.doi.org/10.21883/os.2021.02.50560.255-20.

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Reverse resonance scattering on the main magnetic mode and wave properties of linear structures consisting of subwavelength dielectric elements in the form of flat thin rings excited by displacement currents of an incident plane electromagnetic wave in the microwave range are studied. It is shown that for a single ring, the magnetic field at the main resonant frequency is concentrated inside the ring and in the near zone, and for structures consisting of two or more rings, the magnetic field is also registered in the far zone. The measured main magnetic resonances in the spectrum of electromagnetic fields of one and two flat rings coincide with the calculated resonant frequencies.

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Decker, M., T. Pertsch y I. Staude. "Strong coupling in hybrid metal–dielectric nanoresonators". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n.º 2090 (28 de marzo de 2017): 20160312. http://dx.doi.org/10.1098/rsta.2016.0312.

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We study resonant photonic–plasmonic coupling between a gold dipole nanoantenna and a silicon nanodisc supporting electric and magnetic dipolar Mie-type resonances. Specifically, we consider two different cases for the mode structure of the silicon nanodisc, namely spectrally separate and spectrally matching electric and magnetic dipolar Mie-type resonances. In the latter case, the dielectric nanoparticle scatters the far fields of a unidirectional Huygens’ source. Our results reveal an anticrossing of the plasmonic dipole resonance and the magnetic Mie-type dipole resonance of the silicon nanodisc, accompanied by a clear signature of photonic–plasmonic mode hybridization in the corresponding mode profiles. These characteristics show that strong coupling is established between the two different resonant systems in the hybrid nanostructure. Furthermore, our results demonstrate that in comparison with purely metallic or dielectric nanostructures, hybrid metal–dielectric nanoresonators offer higher flexibility in tailoring the fractions of light which are transmitted, absorbed and reflected by the nanostructure over a broad range of parameters without changing its material composition. As a special case, highly asymmetric reflection and absorption properties can be achieved. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Melik-Gaykazyan, Elizaveta V., Maxim R. Shcherbakov, Alexander S. Shorokhov, Isabelle Staude, Igal Brener, Dragomir N. Neshev, Yuri S. Kivshar y Andrey A. Fedyanin. "Third-harmonic generation from Mie-type resonances of isolated all-dielectric nanoparticles". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, n.º 2090 (28 de marzo de 2017): 20160281. http://dx.doi.org/10.1098/rsta.2016.0281.

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Subwavelength silicon nanoparticles are known to support strongly localized Mie-type modes, including those with resonant electric and magnetic dipolar polarizabilities. Here we compare experimentally the efficiency of the third-harmonic generation from isolated silicon nanodiscs for resonant excitation at the two types of dipolar resonances. Using nonlinear spectroscopy, we observe that the magnetic dipolar mode yields more efficient third-harmonic radiation in contrast to the electric dipolar (ED) mode. This is further supported by full-wave numerical simulations, where the volume-integrated local fields and the directly simulated nonlinear response are shown to be negligible at the ED resonance compared with the magnetic one. This article is part of the themed issue ‘New horizons for nanophotonics’.

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Han, Aoxue, Colm Dineen, Viktoriia E. Babicheva y Jerome V. Moloney. "Second harmonic generation in metasurfaces with multipole resonant coupling". Nanophotonics 9, n.º 11 (5 de julio de 2020): 3545–56. http://dx.doi.org/10.1515/nanoph-2020-0193.

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AbstractWe report on the numerical demonstration of enhanced second harmonic generation (SHG) originating from collective resonances in plasmonic nanoparticle arrays. The nonlinear optical response of the metal nanoparticles is modeled by employing a hydrodynamic nonlinear Drude model implemented into Finite-Difference Time-Domain (FDTD) simulations, and effective polarizabilities of nanoparticle multipoles in the lattice are analytically calculated at the fundamental wavelength by using a coupled dipole–quadrupole approximation. Excitation of narrow collective resonances in nanoparticle arrays with electric quadrupole (EQ) and magnetic dipole (MD) resonant coupling leads to strong linear resonance enhancement. In this work, we analyze SHG in the vicinity of the lattice resonance corresponding to different nanoparticle multipoles and explore SHG efficiency by varying the lattice periods. Coupling of electric quadrupole and magnetic dipole in the nanoparticle lattice indicates symmetry breaking and the possibility of enhanced SHG under these conditions. By varying the structure parameters, we can change the strength of electric dipole (ED), EQ, and MD polarizabilities, which can be used to control the linewidth and magnitude of SHG emission in plasmonic lattices. Engineering of lattice resonances and associated magnetic dipole resonant excitations can be used for spectrally narrow nonlinear response as the SHG can be enhanced and controlled by higher multipole excitations and their lattice resonances. We show that both ED and EQ–MD lattice coupling contribute to SHG, but the presence of strong EQ–MD coupling is important for spectrally narrow SHG and, in our structure, excitation of narrow higher-order multipole lattice resonances results in five times enhancement.

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Pignol, G., S. Baeßler, V. V. Nesvizhevsky, K. Protasov, D. Rebreyend y A. Voronin. "Gravitational Resonance Spectroscopy with an Oscillating Magnetic Field Gradient in the GRANIT Flow through Arrangement". Advances in High Energy Physics 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/628125.

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Gravitational resonance spectroscopy consists in measuring the energy spectrum of bouncing ultracold neutrons above a mirror by inducing resonant transitions between different discrete quantum levels. We discuss how to induce the resonances with a flow through arrangement in the GRANIT spectrometer, excited by an oscillating magnetic field gradient. The spectroscopy could be realized in two distinct modes (so called DC and AC) using the same device to produce the magnetic excitation. We present calculations demonstrating the feasibility of the newly proposed AC mode.

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Galtier, S., S. V. Nazarenko y A. C. Newell. "On wave turbulence in MHD". Nonlinear Processes in Geophysics 8, n.º 3 (30 de junio de 2001): 141–50. http://dx.doi.org/10.5194/npg-8-141-2001.

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Abstract. We describe the fundamental differences between weak (wave) turbulence in incompressible and weakly compressible MHD at the level of three-wave interactions. The main difference is in the structure of the resonant manifolds and the mechanisms of redistribution of spectral densities along the applied magnetic field B0. Similar to pure acoustic waves, a three-wave resonance between collinear wave vectors is observed but, in addition, we also have a resonance through tilted planes and spheres. The properties of resonances and their consequences for the asymptotics are also discussed.

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MALKOVA, M. y F. DOMINGUEZ-ADAME. "TRANSMISSION RESONANCES IN MAGNETIC STRUCTURES BASED ON NARROW-GAP SEMICONDUCTORS". Surface Review and Letters 07, n.º 01n02 (febrero de 2000): 123–26. http://dx.doi.org/10.1142/s0218625x00000166.

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In this work we are concerned with magnetic junction structures in which a homogeneous narrow-gap semiconductor is subjected to an inhomogeneous magnetic field, in an attempt to elucidate the band-structure effect on the resonance tunneling. Careful investigation of the transmission as a function of the energy shows that the resonances in the spectrum can appear. These are remnants of the Landau levels localized near the interface boundary. Comparing the solutions obtained within two-band and single-band models we found the allowed values of the momentum to be quite different, resulting in different resonant values of the transmission coefficient of electron transport through the magnetic interface.

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Kozlov, D. A. y A. S. Leonovich. "The structure of field line resonances in a dipole magnetosphere with moving plasma". Annales Geophysicae 26, n.º 3 (26 de marzo de 2008): 689–98. http://dx.doi.org/10.5194/angeo-26-689-2008.

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Abstract. A theoretical model of field line resonance in the magnetosphere with a dipole magnetic field and moving plasma was constructed. Motion of medium was simulated by its azimuthal rotation. Analytical and numerical solutions were found for MHD equations describing the structure of field line resonances. It was shown that a monochromatic, fast magnetosonic wave can excite several harmonics of standing Alfvén waves on different resonant surfaces at once. The resonant surface density is maximum in the transition layer at the magnetopause. The resonant oscillation amplitude profile becomes asymmetric in our model in regions with a maximum gradient of the background plasma velocity (plasmapause and magnetopause), in contrast to models with immobile plasma. In the same regions, the phase of resonant oscillations varies non-monotonically across the resonant surface which may serve as a detector of such regions in geomagnetic pulsation observations.

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Tesis sobre el tema "Magnetisk resonans"

Cruz-Ferreira, Fröman Sofia. "Design av en rörlig gummihand för användning i miljöer med magnetisk resonans". Thesis, KTH, Maskinkonstruktion (Inst.), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49611.

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För denna avhandling har en första prototyp av en rörlig gummihand tillverkats, där endast pekfingret rör sig. En gummihand (rubber hand på engelska) är en konstgjord hand som används inom studier av kroppsuppfattning och ägande, vilka utgör ett viktigt område inom studier av människans medvetande. Forskare kan skapa hos testdeltagare illusionen av att en konstgjord hand är en del av en deras kropp. För att förstärka illusionen så kan en kosmetisk proteshandske användas. Ytterligare en del av kroppsbilden är känslan av att orsaka en händelse i den yttre världen. En rörlig gummihand är ett värdefullt verktyg för att studera känslan av både orsakandeoch ägande, som kan hållas isär ändå. Tanken är att en testdeltagare ska kunna fjärrstyra denrörliga gummihanden. För att studera ändringar i hjärnans aktivitet under illusionens gång så måste deltagaren befinna sig i en MR-skanner och undergå en så kallad funktionell MRundersökning. Därför behövde alla delar och komponenter i den rörliga gummihanden vara MRkompatibla.
For this thesis, an initial prototype for an actuated rubber hand with the index finger actuated, was designed and manufactured. A rubber hand is an artificial hand used for studies of body image and ownership, an integral part of research on consciousness in human beings. With an artificial hand, researchers can create an illusion in which a subject can believe that the artificial hand is part of their body. To increase the immersion into the illusion, a cosmetic prosthetic glove can be used for added realism. Another integral part of body image is the sense of agency, in which a subject believes to be the source of an event in the external world. To study agency, while separating agency from ownership, a moving rubber hand is a useful tool. The idea is that a subject is to control the moving rubber hand remotely with their own hand. To be able to study the changes in brain activity during the onset of the illusion, the subject needs to be in an MRI scanner and undergo a so called functional MRI analysis. Therefore, all the materials and components in the actuated rubber hand needed to be MRI compatible.

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Johannesson, Åsa. "Två radiologiska metoder för diagnostik av pankreascancer, multidetektor datortomografi och magnetisk resonans : En litteraturstudie". Thesis, Örebro universitet, Institutionen för hälsovetenskap och medicin, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-23310.

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Sammanfattning Inledning: Den årliga incidensen för pankreascancer är 9 per 100 000 invånare. En tidig diagnos ger förbättrad 5-årsöverlevnad men botar fortfarande få patienter. De senaste åren har den dåliga prognosen förbättras tack vare utvecklingen inom bilddiagnostiken. Författaren i denna litteraturstudie har valt att jämföra multidetektor datortomografi (MDCT) och magnetisk resonans (MR) med kontrastmedel för diagnostik av pankreastumör vid misstänkt pankreascancer. Syfte: Syftet med denna litteraturstudie är att undersöka vilken radiologisk undersökningsmetod som är att föredra vid diagnostisering av pankreascancer, MDCT eller MR. Frågeställning: Är det MDCT eller MR som är bäst vid diagnostisering av pankreascancer? Metod: En litteraturstudie baserad på 12 antal artiklar som är funna i databasen PubMed. Resultat: MDCT och MR har likvärdig diagnostisk säkerhet att upptäcka pankreastumör samt påvisa kärlinväxt och förutse operabilitet. Båda metoderna har en jämförbar hög noggrannhet för karakterisering av förändringens aggressivitet. Slutsats: Såväl MDCT och MR är likvärdiga två mycket bra radiologiska metoder för att diagnostisera pankreascancer. MDCT har fortfarande en större tillgänglighet är MR men dess nackdel är man utsätter patienterna för joniserande strålning. MR är därför en metod att föredra och med stor sannolikhet kommer dess tillgänglighet att öka kraftigt i framtiden.

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Rydell, Joakim. "Advanced MRI Data Processing". Doctoral thesis, Linköping : Department of Biomedical Engineering, Linköpings universitet, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10038.

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Karlsson, Terese. "Improvements within patient experience during MRI". Thesis, KTH, Människa och Kommunikation, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209939.

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MRI is one of the biggest and most growing imaging techniques. Even though itis one of the most harmless technologies a big portion of the patients experienceanxiety during the exam. By improving the patient experience unnecessary psychologicalstress for the patient can be prevented, the patient movement wouldthen decrease and therefore the imaging can be improved without changing thetechnique. Participant observations at four dierent MRI departments werecompleted with six interviews with radiographers and technical MRI personnelin order to get insight in the work around an MRI exam and the problemsthat patients experience. The data collection resulted in three improvementareas: the atmosphere of the waiting room, the atmosphere of the MRI roomand the headset used by the patient during the MRI exam. These improvementareas were paired up with solution suggestions which were then controlled andcommented by one MRI specialist, one MRI developer and one radiographer tovalidate the suggestions. The conclusion was that there is already much doneto improve the environment in the MRI room, even though more can be done.The waiting room, on the other hand ,has not been an object for studies orfor improvements before. Therefore more calculation about how big of a protit could be, to improving the atmosphere in the waiting room, should be doneso one knows how much resources one can be put into that improvement area.Lastly there are potential solutions for how to create a much better headset butbecause the generated solutions in this area are so technically challenging moreresearch has to be done before it can be realised.
MR är en av de största och mest växande medicinsk bildgivande teknikerna som finns. Även om tekniken är helt ofarlig är det många patienter som lider av ångest kopplad till undersökningen. Genom att förbättra patientens upplevelse kan man förbygga den ångesten, då kommer också patienten kunna ligga mera still under undersökningen och därför kommer bilderna kunna förbättras utan att ändra tekniken.Datainsamlingen bestod av deltagande observationer på fyra olika röntgenavdelningar tillsammans med sex stycken intervjuer med både röntgensköterskor och personal som jobbar med MR-tekniken. Detta för att få en inblick i jobbet runt en MR undersökning och problemtiken som patienterna upplever. Datainsamlingen resulterade i tre olika förbättringsområden: väntrummet, undersökningsrummet och headsetet som patienten använder under MR-undersökningen. Dessa förbättringsområden parades ihop med förbättringsförs-lag och validerades sedan med en MR speciallist, en utvecklare och en röntgensköterska.Slutsatsen var att det idag görs mycket för att förbättre miljön i undersökningsrummet, även om mycket mer kan göras. Väntrummet, och andra sidan, har inte varit föremål för varken studier eller förbättringar och därför behöver uträkningar göras på hur stor vinst det skulle vara med en förbättrad miljö där för att veta hur mycket resurser som kan läggas på det. Till sist kan det konstateras att det finns potentiella lösningar för hur ett bättre headset skulle kunna skapas, men eftersom de förslagen som genererats i den här studien är så tekniskt avancerade behövs mer forskning för att kunna realisera lösningarna.

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Stanley, Daniel C. "MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES". Miami University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=miami1376500586.

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Risa, Øystein. "Application of high-resolution NMR spectroscopy in metabolic studies of the eye". Doctoral thesis, Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-889.

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High-resolution NMR spectroscopy has, during the last two decades, had an increasing impact in biological and biochemical research. Rapid advances have led to improvements in sensitivity and dispersion of the spectra and have allowed more detailed assignment and monitoring of endogenous biochemical molecules. One of the latest implementations has been a technique known as high-resolution magic angle spinning (HR-MAS) NMR spectroscopy which has made it possible to obtain high-resolution proton spectra of intact tissue and cells. Simultaneous detection of a large number of metabolites by NMR spectroscopy has been successfully applied to investigate disordered metabolism for a numerous of diseases and toxic processes.

The objectives in the present work have been to evaluate different ¹H NMR spectroscopy protocols as analytical tools in eye research, and further use these protocols to extract and interpret information on metabolic changes in the eye induced by external pathological stimuli. Special focus has been paid to changes in the lens and the development of cataracts.

The ¹H NMR spectra of intact lenses and eye tissue extracts in present thesis showed an extensive picture of NMR detectable metabolites. In addition to the detailed analysis of extracts from cornea, lens and aqueous humour, this work has created a basis for implementation and interpretation of HR-MAS ¹H NMR spectroscopy on intact lens tissue. Several significant changes in the metabolic content in cornea, aqueous humour, and lens after alkali-burns to the eye were detected and showed how careful ¹H NMR spectroscopy analysis of tissue extracts provided new information (quantitative and qualitative) on the metabolic reaction pattern in the anterior eye segment in relation to eye alkali-burn injuries.

HR-MAS studies on lenses exposed in vivo to different ultraviolet-B doses did not reveal any dose-response relationship for the metabolic changes. However, significant concentration changes for most of the observed metabolites seven days post exposure demonstrated that closeto- threshold UVB radiation had great impact on the metabolites in the lens. Further time dependency studies of metabolic changes in rat lens after UVB radiation showed that significant changes in metabolite concentrations were subsequent to lens opacity development. Long-term steroid treatment (36 days) seemed to have greater impact on the metabolic changes compared to the UVB-induced changes 24 hours after UVB radiation. Even though no obvious cataract was detected after the combined treatment of steroids and UVB radiation, significant changes were observed for several metabolites.

Paper III is reprinted with kind permission from Elsevier, sciencedirect.com

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Choi, Chang-Hoon. "Fast field-cycling magnetism transfer contrast magnetic resonance imaging (FFC MTC MRI)". Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=158558.

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Magnetisation Transfer Contrast (MTC) is a well-established magnetic resonance imaging (MRI) contrast-generating mechanism, and is widely used for clarifying MR-invisible macromolecular information indirectly via MR-detectable free protons using an offresonance pre-saturation radiofrequency (RF) pulse (or MT pulse). As a result of MT pulse irradiation, magnetisation between both proton pools is exchanged and the signal intensity of mobile protons is decreased in relation to the amount of macromolecules. MTC MRI is normally implemented at a fixed magnetic field; however, it may be useful to evaluate changes of the MT effect as a function of magnetic field (B0). In order to explore fielddependent MTC experiments using a single MR instrument, two techniques are required, which enable simultaneously shifting both B0 and the resonance frequency of an RF coil (f0) during MT pulse irradiation and returning them to the original condition during MR data acquisition. Switching of B0 is achieved by fast field-cycling (FFC). FFC is a novel technique allowing B0 to shift between levels rapidly during the pulse sequence. This makes it possible to perform a number of beneficial field-dependent studies and/or to provide new MR contrast mechanisms. Switching of f0 requires an actively frequencyswitchable RF coil. This coil was designed and constructed for frequencies at and below 2.5 MHz proton Larmor frequency. The design employed PIN diodes, and enabled switching f0 between five different values. Using these techniques and tools, fielddependent MTC experiments were carried out with a control sample and samples with different concentrations of agarose gel. Due to the absence of macromolecules in the control, the MT effect was almost zero, whereas the MT effect observed in agarose samples increased with increasing concentration of macromolecules. Furthermore, MT effects ((for a given set of MT pulse conditions) were larger at higher B0.

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Lintz, William A. "Electromagnetic resonances of metallic bodies". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA333440.

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Thesis (M.S. in Electrical Engineering) Naval Postgraduate School, June 1997.
Thesis advisors, Richard W. Adler, Jovan E. Lebaric. Includes bibliographical references (p. 45). Also available online.

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Meier, Benno. "Nuclear Magnetic Resonance in pulsed high magnetic fields". Doctoral thesis, Universitätsbibliothek Leipzig, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-101205.

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Höchste Magnetfelder haben sich zu einem unverzichtbaren Werkzeug der Festkörperphysik entwickelt. Sie werden insbesondere verwendet, um die elektronischen Eigenschaften von modernen Materialien zu erforschen. Da Magnetfelder oberhalb von 45 Tesla nicht mehr mit statischen (z.B. supraleitenden) Feldern zu erreichen sind, haben sich weltweit verschiedene Labore auf die Erzeugung gepulster Magnetfelder mit angestrebten Maximalwerten von 100 Tesla spezialisiert. In der vorliegenden Arbeit werden Anwendungsmöglichkeiten der kernmagnetischen Resonanz (NMR) in gepulsten Magnetfeldern aufgezeigt. Es ist gelungen, die starke Zeitabhängigkeit der gepulsten Magnetfelder mittels NMR präzise zu vermessen. Die genaue Kenntnis des Magnetfelds nach dem Puls ermöglicht, die Zeitabhängigkeit aus den Daten zu entfernen, sodass auch eine kohärente Signal-Mittelung möglich ist. Davon ausgehend werden erstmalig Messungen der chemischen Verschiebung, der Knight Shift, der Spin-Gitter-Relaxationsrate 1/T1 und der Spin-Spin-Relaxationsrate 1/T2 diskutiert. Schließlich werden die im Zusammenhang mit gepulsten Magnetfeldern erarbeiteten Gleichungen in vereinfachter Form zur genauen Messung und Analyse des freien Induktions-Zerfalls von 19F Kernspins in Calciumfluorid verwendet. Durch Messung des Zerfalls über sechs Größenordnungen wird eine genaue Analyse bezüglich einer neuartigen Theorie ermöglicht, welche den Zerfall basierend auf der Annahme mikroskopischen Chaos\' erklärt. Diese Theorie hat das Potenzial, zu einem tieferen Verständnis von Quantenchaos in makroskopischen Vielteilchensystemen zu führen.

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Zhang, Rui. "Ionic Copolymer-Magnetite Complexes for Magnetic Resonance Imaging and Drug Delivery". Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/73648.

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This thesis is focused on the design, synthesis and characterization of magnetite-ionic copolymer complexes as nanocarriers for drug delivery and magnetic resonance imaging. The polymers included phosphonate and carboxylate-containing graft and block copolymers. Oleic-acid coated magnetite nanoparticles (8-nm and 16-nm diameters) were investigated. Cisplatin and carboplatin were used as sample drugs. The potentials of the magnetite-ionomer complexes as dual drug delivery carriers and magnetic resonance imaging agents were evaluated. An acrylate-functional poly(ethylene oxide) macromonomer and hexyl (and propyl) ammonium bisphosphonate methacrylate monomers were synthesized. Conventional free radical copolymerizations were conducted to synthesize the graft copolymers. The acrylate-functional poly(ethylene oxide) macromonomer was also used to form graft copolymers with tert-butyl acrylate. Block ionomers containing poly(tert-butyl acrylate) were synthesized via atom transfer radical polymerization, then the tert-butyl groups were removed to afford anions. All the monomers and polymers were characterized by 1H NMR to confirm their structures and assess their compositions. Phosphonate-containing polymers were also characterized by 31P NMR. Magnetite nanoparticles (8-nm diameter) were synthesized by reducing Fe(acac)3 with benzyl alcohol. The 16-nm diameter magnetite was synthesized by thermal decomposition of an iron oleate precursor in trioctylamine as a high-boiling solvent. The iron-oleate precursor was synthesized with iron (III) chloride hexahydrate and sodium oleate with mixed solvents. TEM images of the magnetite were obtained. Magnetite-ionomer complexes were synthesized by binding a portion of the anions (carboxylate or phosphonate) on the copolymers onto the surfaces the magnetite. The remainder of the anions was used to bind with cisplatin and carboplatin via chelation. Physicochemical properties of the complexes were measured by dynamic light scattering. All the complexes with different polymers and magnetite nanoparticles displayed relatively uniform sizes and good size distributions. The magnetite-ionomer complexes displayed good colloidal stabilities in simulated physiological conditions for at least 24 hours. Those graft and block copolymer-magnetite complexes may be good candidates as drug carriers for delivery applications. After cisplatin and carboplatin loading, the sizes of the complexes increased slightly and the zeta potential decreased slightly, which indicated that the loadings were successful. Minimal loss of iron was found, signaling that the binding strengths between the magnetite and the anions of the graft copolymers were strong. 8.7 wt% of platinum was found in the cisplatin loaded complexes and 6.9% in the carboplatin loaded complexes. The results indicated that the magnetite-graft ionomer complexes were capable of loading drugs. Drug release studies were performed at pH 4.6 and 7.4 to mimick endosomal conditions and the physiological environment. Sustained release of drugs was observed. This further indicated the potential for using the magnetite-ionomer complexes as drug carriers. Transverse relaxivities of the magnetite-ionomer complexes with and without drugs were measured and compared to a commercial T2-weighted iron MRI contrast agent-Feridex®. All the complexes had higher relaxivities compared to Feridex®. Thus, the magnetite-ionomer complexes are promising candidates for dual magnetic resonance imaging and drug delivery.Moreover, the aqueous dispersion of the complexes was found to heat upon exposure to an AC magnetic field, thus potentially allowing heat-induced drug release.
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Libros sobre el tema "Magnetisk resonans"

Guimarães, Alberto Passos. Magnetism and magnetic resonance in solids. New York: Wiley, 1998.

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Manning, Warren J. Cardiovascular magnetic resonance. 2^a ed. Philadelphia, PA: Saunders/Elsevier, 2010.

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Berliner, Lawrence J. Biological Magnetic Resonance. Boston, MA: Springer US, 1990.

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Webb, G. A. Nuclear magnetic resonance. Editado por Royal Society of Chemistry (Great Britain). Cambridge: Royal Society of Chemistry, 2008.

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Webb, G. A. Nuclear magnetic resonance. Editado por Royal Society of Chemistry (Great Britain). Cambridge: Royal Society of Chemistry, 2009.

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Myerson, Saul G. Cardiovascular magnetic resonance. Oxford: Oxford University Press, 2009.

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Magnetic resonance workbook. New York: Raven Press, 1990.

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Hore, P. J. Nuclear magnetic resonance. Oxford: Oxford University Press, 1995.

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Hirsch, Sebastian, Jürgen Braun y Ingolf Sack. Magnetic Resonance Elastography. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527696017.

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Sigal, Robert, D. Doyon, Ph Halimi y H. Atlan. Magnetic Resonance Imaging. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73037-5.

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Capítulos de libros sobre el tema "Magnetisk resonans"

Patterson, James D. y Bernard C. Bailey. "Magnetism, Magnons, and Magnetic Resonance". En Solid-State Physics, 405–554. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75322-5_7.

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Patterson, James y Bernard Bailey. "Magnetism, Magnons, and Magnetic Resonance". En Solid-State Physics, 355–462. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02589-1_7.

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Menard, David y Robert Barklie. "Electron Paramagnetic and Ferromagnetic Resonance". En Handbook of Magnetism and Magnetic Materials, 1–35. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63101-7_25-1.

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de Lacheisserie, Étienne du Trémolet, Damien Gignoux y Michel Schlenker. "Magnetic Resonance Imaging". En Magnetism, 355–86. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4615-1129-8_9.

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Décorps, Michel y Christoph Segebarth. "Magnetic resonance imaging". En Magnetism, 355–86. New York, NY: Springer New York, 2005. http://dx.doi.org/10.1007/978-0-387-23063-4_9.

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Slichter, Charles P. "Spin Temperature in Magnetism and in Magnetic Resonance". En Principles of Magnetic Resonance, 219–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-662-09441-9_6.

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Misra, Sushil K. "Single-Molecule Magnets and Magnetic Quantum Tunneling". En Multifrequency Electron Paramagnetic Resonance, 845–74. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633531.ch21.

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Yamada, T., S. Yamamoto, T. Matsuda, M. Morita, M. Takechi y Y. Shimada. "Superconducting Magnets for Magnetic Resonance Imaging". En Advances in Superconductivity, 55–58. Tokyo: Springer Japan, 1989. http://dx.doi.org/10.1007/978-4-431-68084-0_8.

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Korosec, Frank R. "Basic Principles of MRI and MR Angiography". En Magnetic Resonance Angiography, 3–38. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-1686-0_1.

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Yang, Qi y Debiao Li. "Contrast-Enhanced MR Angiography of the Coronary Arteries". En Magnetic Resonance Angiography, 141–48. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-1686-0_10.

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Actas de conferencias sobre el tema "Magnetisk resonans"

Demas, Vasiliki, Pablo J. Prado, Martin D. Hürlimann, Yi Qiao Song, Paola Fantazzini y Villiam Bortolotti. "Compact Magnets for Magnetic Resonance". En MAGNETIC RESONANCE IN POROUS MEDIA: Proceedings of the 9th International Bologna Conference on Magnetic Resonance in Porous Media (MRPM9), including 8th Colloquium on Mobile Magnetic Resonance (CMMR8). AIP, 2008. http://dx.doi.org/10.1063/1.3058541.

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Barton, David A. W., Stephen G. Burrow y Lindsay R. Clare. "Energy Harvesting From Vibrations With a Nonlinear Oscillator". En ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-86841.

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In this paper we present a nonlinear electromagnetic energy harvesting device that has a broadly resonant response. The nonlinearity is generated by a particular arrangement of magnets in conjunction with an iron-cored stator. We show the resonant response of the system to both pure-tone excitation and narrow-band random excitation. In addition to the primary resonance, the super-harmonic resonances of the harvester are also investigated and we show that the corresponding mechanical up-conversion of the excitation frequency may be useful for energy harvesting. The harvester is modeled using a Duffing-type equation and the results compared to the experimental data.

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Barker, Alex J., Brant Cage, Stephen Russek, Ruchira Garg, Robin Shandas y Conrad R. Stoldt. "Tailored Nanoscale Contrast Agents for Magnetic Resonance Imaging". En ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-81503.

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Two potential molecular imaging vectors are investigated for material properties and magnetic resonance imaging (MRI) contrast improvement. Monodisperse magnetite (Fe3O4) nanocrystals ranging in size from 7 to 22 nm are solvothermally synthesized by thermolysis of Fe(III) acetylacetonate (Fe(AcAc)3) both with and without the use of heptanoic acid (HA) as a capping ligand. For the resulting Fe3O4 nanocrystals, X-Ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and superconducting quantum interference device magnetometry (SQUID) is used to identify the average particle size, monodispersity, crystal symmetry, and magnetic properties of the ensembles as a function of time. The characterization study indicates that the HA synthesis route at 3 hours produced nanoparticles with the greatest magnetic anisotropy (15.8 × 104 J/m3). The feasibility of Fe8 single molecule magnets (SMMs) as a potential MRI contrast agent is also examined. SQUID magnetization measurements are used to determine anisotropy and saturation of the potential agents. The effectiveness of the Fe3O4 nanocrystals and Fe8 as potential MRI molecular probes is evaluated by MRI contrast improvement using 1.5 mL phantoms dispersed in de-ionized water. Results indicate that the magnetically optimized Fe3O4 nanocrystals and Fe8 SMMs hold promise for use as contrast agents based on the reported MRI images and solution phase T1/T2 shortening.

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Kobayashi, Noriyasu, Souichi Ueno, Kota Nomura, Makoto Ochiai, Yuko Kitajima y Shigeki Maruyama. "Basic Characteristics of Eddy Current Testing Using Resonant Coupling". En ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78429.

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It has been demonstrated that magnetic resonant coupling is effective for improving the characteristics of ECT sensor, especially the lift-off-dependent reduced sensitivity and noise. The lift-off-dependent reduced sensitivity and noise are caused by the decrease of voltage gain from the exciter coil to detector coil. Magnetic resonant coupling is generally usable to increase the voltage gain from the transmitter coil to the receiver coil. Magnetic resonant coupling was applied to ECT in these experiments to investigate the phenomena of magnetic resonant coupling in the ECT. In the ECT setup, the voltage gain G increased more than 6 times by magnetic resonant coupling at a frequency of 105 kHz. The voltage gain ratio (GR/GNR) was rising 1.12 times when the lift-off length increased from 1mm to 2 mm. This result verified that magnetic resonant coupling has the potential for improving the characteristics of ECT. The EDM slit signal and the lift-off noise were calculated from the experimental results, respectively. Using magnetic resonant coupling, the EDM slit signal increased 1.5 times and the lift-off noise was reduced by 34 % at a lift-off length of 2mm. these results confirmed that magnetic resonant coupling is effective for improving the characteristics of ECT. Additional experiments were performed in order to verify the effect of magnetic resonant coupling for the wobbling (lift-off) noise in the tube inspection. In the vibration test of the ECT sensor inside the tube, the lift-off noise decreased by 28 % on average by magnetic resonant coupling. In the scanning test of the ECT sensor inside the tube, the wobbling and other noises were obviously reduced by magnetic resonance coupling.

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Meinhold, Waiman, Efe Ozkaya, Jun Ueda y Mehmet Kurt. "Tuneable Resonance Actuators for Magnetic Resonance Elastography". En 2019 Design of Medical Devices Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/dmd2019-3313.

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Palpation, or physical manipulation of tissue to assess mechanical properties is one of the most prevalent and valuable clinical evaluations. Because physical interaction is needed, historically palpation has been limited to easily accessible surface level tissues. Magnetic resonance elastography (MRE) combines non-invasive Magnetic Resonance Imaging (MRI) with mechanically induced shear waves, producing the ability to map elasticity of soft tissues in vivo. Actuator design has been a limiting factor in MRE advancements. In this study, a mechanical resonator with adjustable resonant frequency was designed to be used in MRE applications. The designed piezoelectric actuator was fully MRI compatible, and capable of dynamically adjusting its resonant frequency. The purpose was to keep the displacement amplitude sufficiently large over a wide actuation frequency range. The outer stage of the amplifier contained movable side masses for tuning resonance frequency.

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Dohnal, Fadi, Wolfgang Paradeiser y Horst Ecker. "Experimental Study on Cancelling Self-Excited Vibrations by Parametric Excitation". En ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14552.

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This article reports on the experimental verification of an anti-resonance effect obtained by parametric stiffness excitation. From theoretical studies it is known that parametric excitation at non-resonant parametric resonances can improve the damping behavior of a mechanical system and even stabilize an otherwise unstable system. To demonstrate this effect, a test setup was designed, based on a two-mass vibration system, gliding on an air track. Parametric stiffness excitation (PSE) was realized by a mechanical device that creates a time-periodic stiffness by modulating the tension in an elastic rubber band. With this device it was possible to demonstrate the improved damping behavior of the system when the PSE device is operating at or near the first parametric combination resonance of difference type. Also, a simple electro-magnetic device was used to create self-exciting forces. It could be shown for the first time that it is indeed possible to stabilize the unstable system by introducing parametric stiffness excitation.

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Boyle, J. W. "HF magnetics for high power resonant switching converters". En IEE Colloquium on Resonant Systems. IEE, 1995. http://dx.doi.org/10.1049/ic:19950046.

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Eremenko, A. V., V. V. Pishko, V. V. Tsapenko, Y. G. Pashkevich y V. L. Sobolev. "Magnetic Resonance Exchange Modes in Multisublattice Magnets". En International Conference on Millimeter Wave and Far-Infrared Technology. IEEE, 1990. http://dx.doi.org/10.1109/icmwft.1990.711415.

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Challa, Vinod R., M. G. Prasad, Yong Shi y Frank Fisher. "A Wide Frequency Range Tunable Vibration Energy Harvesting Device Using Magnetically Induced Stiffness". En ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41985.

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Although wireless sensors show extensive promise across a wide range of applications, one requirement necessary for widespread deployment is a suitable long-life power source. Self sustainable powering techniques allow for efficient use of these sensors, whose potential life is usually longer than that of the power sources. Vibration energy harvesting techniques offer to have the potential to be employed in powering these devices. The most important requirement of vibration energy harvesting devices is that they be in resonance to harvest energy efficiently. Most of the vibration energy harvesting devices built, irrespective of the mechanism involved, are based on a single resonance frequency, with the efficiency of these devices is very much limited to that specific frequency. In this paper, a frequency tunable mechanism is presented which allows the energy harvesting device to generate power over a wide range of frequencies. External magnetic forces have been used to induce additional stiffness which is variable depending on the distance between the magnets. This technique allowed us to tune the resonance frequencies to have +/− 20% of the original (untuned) resonant frequency. Further, the device can be tuned to higher and lower frequency with respect to the untuned resonance frequency by using attractive and repulsive magnetic forces, respectively. As a proof-of-concept, a piezoelectric cantilever-based energy harvesting device with a natural frequency of 26 Hz was fabricated whose resonance frequency was successfully tuned over a frequency range of 22 Hz to 32 Hz, enabling a continuous power output of 240 μW to 280 μW over the entire frequency range. The tuning mechanism can be employed to any vibrating structure.

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Cao, Juan, Changsheng Li, He Zhang, Xiaofeng Wang, Weixin Li y Tianye Qiu. "Analysis for Resonance Characteristics of Magnetic Resonant Coupling Wireless Power Transmission System". En 2018 13th World Congress on Intelligent Control and Automation (WCICA). IEEE, 2018. http://dx.doi.org/10.1109/wcica.2018.8630553.

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Informes sobre el tema "Magnetisk resonans"

Author, Not Given. Magnetic Resonance Facility. Office of Scientific and Technical Information (OSTI), marzo de 2012. http://dx.doi.org/10.2172/1038333.

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Marangoni, Alejandro G. y M. Fernanda Peyronel. Pulsed Nuclear Magnetic Resonance Spectrometry. AOCS, abril de 2014. http://dx.doi.org/10.21748/lipidlibrary.40797.

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Hammel, P. C., Z. Zhang, B. J. Suh, M. L. Roukes, M. Midzor, P. E. Wigen y J. R. Childress. Magnetic Resonance Force Microscope Development. Office of Scientific and Technical Information (OSTI), junio de 1999. http://dx.doi.org/10.2172/763903.

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Mishra, S., W. J. Gammon y D. P. Pappas. Magnetic x-ray linear dichroism in resonant and non-resonant Gd 4f photoemission. Office of Scientific and Technical Information (OSTI), abril de 1997. http://dx.doi.org/10.2172/603526.

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Sacchi, M., C. F. Hague, E. M. Gullikson y J. Underwood. Resonant magnetic scattering of polarized soft x rays. Office of Scientific and Technical Information (OSTI), abril de 1997. http://dx.doi.org/10.2172/603486.

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Rugar, Daniel, John Sidles y Alfred Hero. Single-Spin Magnetic Resonance Force Microscopy. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2005. http://dx.doi.org/10.21236/ada440745.

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Ikeda, Debra M. Magnetic Resonance Spectroscopy of Breast Cancer. Fort Belvoir, VA: Defense Technical Information Center, octubre de 2002. http://dx.doi.org/10.21236/ada412988.

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Schweizer, M. Developments in boron magnetic resonance imaging (MRI). Office of Scientific and Technical Information (OSTI), noviembre de 1995. http://dx.doi.org/10.2172/421332.

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Schmidt, D. M. y M. A. Espy. Low-field magnetic resonance imaging of gases. Office of Scientific and Technical Information (OSTI), noviembre de 1998. http://dx.doi.org/10.2172/674672.

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Hammel, P. C. y Raffi Budakian. Single Nuclear Spin Magnetic Resonance Force Microscopy. Fort Belvoir, VA: Defense Technical Information Center, mayo de 2010. http://dx.doi.org/10.21236/ada532586.

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