Bibliographies thématiques / Magnetic stretcher

Littérature scientifique sur le sujet « Magnetic stretcher »

Auteur : Grafiati

Publié le 13 avril 2024

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Sommaire

Articles de revues
Thèses
Livres
Chapitres de livres
Actes de conférences
Rapports d'organisations

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Magnetic stretcher ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Magnetic stretcher"

Zhu, Jianqiang, Xinglong Xie, Meizhi Sun, Qunyu Bi et Jun Kang. « A Novel Femtosecond Laser System for Attosecond Pulse Generation ». Advances in Optical Technologies 2012 (15 janvier 2012) : 1–6. http://dx.doi.org/10.1155/2012/908976.

Texte intégral

Résumé :

We report a novel ultrabroadband high-energy femtosecond laser to be built in our laboratory. A 7-femtosecond pulse is firstly stretched by an eight-pass offner stretcher with a chirp rate 15 ps/nm, and then energy-amplified by a two-stage optical parametric chirped pulse amplification (OPCPA). The first stage as preamplification with three pieces of BBO crystals provides the majority of the energy gain. At the second stage, a YCOB crystal with the aperture of ~50 mm is used instead of the KDP crystal as the gain medium to ensure the shortest pulse. After the completion, the laser will deliver about 8 J with pulse duration of about 10 femtoseconds, which should be beneficial to the attosecond pulse generation and other ultrafast experiments.

Styles APA, Harvard, Vancouver, ISO, etc.

Vyhlídka, Štěpán, Daniel Kramer, Alexander Meadows et Bedřich Rus. « Offner stretcher aberrations revisited to compensate material dispersion ». Optics Communications 414 (mai 2018) : 207–11. http://dx.doi.org/10.1016/j.optcom.2018.01.016.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Khare, R., P. K. Shukla, G. K. Mishra, C. Mukherjee, S. Talwar, V. K. Dubey, P. Saxena et J. K. Mittal. « A novel confocal optical pulse stretcher for laser pulses ». Optics Communications 282, n^o 19 (octobre 2009) : 3850–53. http://dx.doi.org/10.1016/j.optcom.2009.06.041.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Li, Wei, Xiao Wang, Yanlei Zuo, Yilin Hong, Bilong Hu, Zhaohui Wu, Jie Mu, Kainan Zhou et Xiaoming Zeng. « A cylindrical Öffner stretcher based on ternary reflector for femtosecond petawatt-level laser system ». Chinese Optics Letters 21, n^o 7 (2023) : 073201. http://dx.doi.org/10.3788/col202321.073201.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Roussy, A., S. Karthikeyan, I. Oomen, Th Ortlepp, E. H. Sujiono, A. Brinkman et H. Rogalla. « HTS Pulse-Stretcher and Second Order Modulator : Design and First Results ». IEEE Transactions on Appiled Superconductivity 15, n^o 2 (juin 2005) : 457–60. http://dx.doi.org/10.1109/tasc.2005.849873.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Sivabalan, S., et J. P. Raina. « High Normal Dispersion and Large Mode Area Photonic Quasi-Crystal Fiber Stretcher ». IEEE Photonics Technology Letters 23, n^o 16 (août 2011) : 1139–41. http://dx.doi.org/10.1109/lpt.2011.2157817.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Chengtao Zhang, Chengtao Zhang, Xiaochao Wang Xiaochao Wang, Wei Fan Wei Fan, Daxing Rao Daxing Rao et Zunqi Lin Zunqi Lin. « 1 053-nm all-f iber pulse multi-pass stretcher using a linear chirped fiber Bragg grating ». Chinese Optics Letters 11, n^o 7 (2013) : 070606–70609. http://dx.doi.org/10.3788/col201311.070606.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Yang Qingwei, 杨庆伟, 郭爱林 Guo Ailin, 谢兴龙 Xie Xinglong, 张福领 Zhang Fuling, 孙美智 Sun Meizhi, 高奇 Gao Qi, 李美荣 Li Meirong et 林尊琪 Lin Zunqi. « Influence of Mirror Curvature Radius Manufacture Errors in Offner Stretcher on Output Pulse Contrast ». Acta Optica Sinica 28, n^o 8 (2008) : 1584–89. http://dx.doi.org/10.3788/aos20082808.1584.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Liu, Xingyan, Cheng Wang, Yi Xu, Yuxin Leng et Ruxin Li. « A broadband low-chromatic-aberration single grating Offner stretcher by 3D analysis ». Optics Communications 465 (juin 2020) : 125502. http://dx.doi.org/10.1016/j.optcom.2020.125502.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Bartulevicius, T., L. Veselis, K. Madeikis, A. Michailovas et N. Rusteika. « Compact femtosecond 10 μJ pulse energy fiber laser with a CFBG stretcher and CVBG compressor ». Optical Fiber Technology 45 (novembre 2018) : 77–80. http://dx.doi.org/10.1016/j.yofte.2018.06.006.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Thèses sur le sujet "Magnetic stretcher"

Nagle, Irène. « Magnetic approaches for tissue mechanics and engineering of the skeletal muscle ». Electronic Thesis or Diss., Université Paris Cité, 2023. http://www.theses.fr/2023UNIP7079.

Texte intégral

Résumé :

La thèse est centrée sur les propriétés mécaniques macroscopiques de tissus modèles. L'incorporation de nanoparticules super-paramagnétiques (maghémite) au cœur des cellules permet à la fois leur manipulation à distance pour créer des agrégats multicellulaires de forme contrôlée et l'application de forces pour mesurer leurs propriétés mécaniques ou induire leur organisation. Les cellules modèles choisies sont des précurseurs de muscle de souris (C2C12), pour une application directe à la mécanique et à l'ingénierie du muscle squelettique. Les déformations des agrégats formés magnétiquement et soumis par la suite à un gradient de champ magnétique permettent de mesurer leurs propriétés mécaniques macroscopiques (tension de surface, module d'Young). Nous avons ainsi pu étudier l'interaction entre les propriétés de la cellule individuelle (adhésions intercellulaires, structure et tension de l'actine) et les propriétés mécaniques à l'échelle du tissu, mettant notamment en évidence l'importance de la désorganisation de la desmine pour la rigidité et la tension de surface macroscopique. En utilisant des cellules exprimant une desmine mutée (mutation ponctuelle présente chez des patients souffrant de desminopathie), nous avons souligné le rôle fondamental de l'architecture du réseau de filament intermédiaire dans ce tissu modèle 3D. Les forces magnétiques ont ensuite été utilisées pour aider la différenciation en cellules musculaires en favorisant leur alignement et en permettant leur stimulation mécanique. Pour ce faire, nous avons développé un étireur magnétique qui étire des agrégats multicellulaires de cellules précurseurs de muscles placées entre deux aimants mobiles et favorise leur différenciation en cellules musculaires alignées. Ce dispositif représente un outil innovant pour étudier les déformations cellulaires sous étirement et la différenciation musculaire
The thesis is focused on the macroscopic mechanical properties of tissue models. The incorporation of superparamagnetic nanoparticles (maghemite) into the cells enables both their manipulation at distance to create multicellular aggregates of controlled shape and the application of forces to measure their mechanical properties or induce their organization. The cellular model chosen is a mouse muscle precursor cell line (C2C12), for a direct application to tissue mechanics and tissue engineering of the skeletal muscle. The deformations of the aggregate formed magnetically and then submitted to a magnetic field gradient enable to measure its macroscopic mechanical properties (surface tension, Young's modulus). We could therefore look at the interplay between the individual cell properties (cell-cell adhesions, actin structure and tension) and the mechanical properties at the tissue scale revealing the importance of desmin disorganization in macroscopic rigidity and surface tension. By using desmin-mutated muscle precursor cells (point mutations involved in desminopathies), we enhanced the fundamental role of the intermediate filament network architecture in this 3D tissue model. Magnetic forces were then used to promote differentiation into muscular cells by first reproducing their alignment and secondly mechanically stimulating them. To that end, we developed a magnetic stretcher to stretch multicellular aggregates of muscle precursor cells trapped between two mobile magnets and induce their differentiation into aligned muscular cells. This magnetic stretcher represents a new tool to study cell deformation under stretching and muscle cell differentiation

Styles APA, Harvard, Vancouver, ISO, etc.

Lacey, Lauren Elizabeth. « Assessment of repetitive facilitation exercise with fMRI-compatible rehabilitation device for hemiparetic limbs ». Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51879.

Texte intégral

Résumé :

In order for stroke subjects to gain functional recovery of their hemiparetic limbs, facilitation techniques such as the repetitive facilitation exercise, or RFE, have been developed. Currently, there is a lack of understanding of the neural mechanisms associated with these types of facilitation techniques. To better understand the neural mechanisms associated with the RFE a functional magnetic resonance imaging (fMRI) study should be conducted. This thesis presents experimental results testing the feasibility of implementing an fMRI-compatible actuator to facilitate a myotatic reflex in synchronization with the subject’s intention to move their hemiparetic limb. Preliminary data from a healthy individual demonstrated the feasibility of overlapping the long latency component of the afferent myotatic reflex, created by electrical stimulation, with descending nerve impulses, created using transcranial magnetic stimulation, in a time window of 15ms. In addition, a pneumatic actuation time delay due to long transmission line was evaluated. The pneumatic actuator met the timing precision requirement for the rehabilitation device for varying transmission line lengths. Therefore a pneumatic actuation system was chosen for the rehabilitation device. This thesis will also presents on the design of an fMRI-compatible pneumatic actuator device to excite a stretch reflex response. Initial, experimental results with the device demonstrated that the designed pneumatic device can control the timing of the muscle response with a fixed signal within the required 15ms window required for cortical facilitation, which was found in the previous feasibility study. However, the device was unable to create a long latency reflex observable at the muscle. Finally, this thesis presents on the capability of the device in creating subthreshold long latency response with precision to overlap with a subthreshold descending nerve impulse, created using transcranial magnetic stimulation. The overlap of the two responses was evaluated by comparing the amplitude of the muscle response with and without the stretch reflex, created by the fMRI-compatible pneumatic actuator device. Varying time delays were analyzed.

Styles APA, Harvard, Vancouver, ISO, etc.

Denyszyn, Jonathan Charles. « The dielectric behavior of perovskite-related manganese oxides with stretched bonds or multiferroic properties ». Thesis, 2006. http://hdl.handle.net/2152/2859.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Chung-Hsien, Hung, et 洪忠賢. « The study of fast measurement of magnetic field intensity by using a stretched wire ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/43382627414251765783.

Texte intégral

Résumé :

碩士
國立交通大學
電子物理系
88
SRRC is a third generation light source storage, which accommodate many insertion device magnets to produce the high intensity photon flux and varying polarization light of synchrotron radiation. The SRRC magnet lattice is a triple bend achromat that can minimize the electron emittance. The lattice magnet includes dipole, quadrupole and sextrupole magnets. In order to improve the synchrotron radiation quality and decrease electron perturbation. The qualities of lattice magnet and insertion device magnets are very important. Therefor we need a high precision and accuracy measurement system to understand magnet characteristics of lattice and insertion device magnets and to correct and shim the defect magnets. Herein, we want to set up a simple and high-speed automatic measurement system with stretched wire method. This method compare to traditional measurement methods, such as hall probe, flipping coil and rotating coil, it can reduce time consummation on the field measurement. The measurement results of harmonic field strength of lattice magnets and the first and second field integral strength of insertion device magnets that can analysis magnet defects and correct them.

Styles APA, Harvard, Vancouver, ISO, etc.

« Modelling the Geometric Structure of the Magnetic Field in the Nightside Magnetosphere ». Thesis, 2013. http://hdl.handle.net/10388/ETD-2013-03-1448.

Texte intégral

Résumé :

In this thesis, a simple model of the stretched magnetic field lines in the nightside magnetotail was created. The nightside magnetosphere model contains four main regions: plasmasphere, plasma sheet, magnetic lobes, and low latitude boundary layers. The plasma sheet is split into three regions based on the shape of the closed field lines present: dipole plasma sheet, transition plasma sheet, and stretched plasma sheet (SPS). The SPS, the focus of this thesis, is split into two regions: disruption zones (DZs) and a central neutral sheet (NS). The shape of the stretched field lines contain four inflection points. The convex curvature regions form the DZs and the central concave curvature region forms the NS. The NS is split into two regions: outer neutral sheet (ONS) and inner neutral sheet (INS). Due to the reversal of the x-component of the magnetic field at the center line of the NS, the protons are magnetized in the ONS and "unmagnetized" in the INS. There are two main current systems in the SPS. The first is a double vortex current system consisting of eastward current in the DZs that closes westward in the NS. The second system is the NS field-aligned current (FAC) system. It is generated in the INS mainly by the earthward convective drift of the electrons while the "unmagnetized" protons have little convective drift and remain tailward of the electrons. This FAC system produces the pre-onset electron auroral arc during the growth phase of the substorm. A simple model of the stretched magnetic field lines was created in order to calculate the current systems present in the SPS. The simple model was based entirely upon the shape of the stretched field lines. It passed two physical tests, divergence of the magnetic field and limits at infinity, so it was used to calculate currents. The total current using Ampere's law and the curvature current was found. Both results agreed with the double vortex current system.

Styles APA, Harvard, Vancouver, ISO, etc.

Livres sur le sujet "Magnetic stretcher"

D, Gilbert Andrew, dir. Stretch, twist, fold : The fast dynamo. Berlin : Springer, 1995.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Childress, Stephen, et Andrew D. Gilbert. Stretch, Twist, Fold : The Fast Dynamo. Springer London, Limited, 2008.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Childress, Stephen, et Andrew D. Gilbert. Stretch, Twist, Fold : The Fast Dynamo. Springer, 2013.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Chapitres de livres sur le sujet "Magnetic stretcher"

Gladkikh, P. I., Yu N. Grigor’ev, S. V. Efimov, A. Yu Zelinskij, I. M. Karnaukhov, S. G. Kononenko, N. I. Mocheshnikov et al. « Magnetic System of the Pulse Stretcher Ring PSR-2000 ». Dans 11th International Conference on Magnet Technology (MT-11), 121–24. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0769-0_20.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Ohtake, H., Z. Liu, S. Izumida, S. Ono et N. Sarukura. « Spectrum control of intense THz-radiation from InAs under magnetic field irradiated with stretched femtosecond laser pulses ». Dans Springer Series in Chemical Physics, 202–4. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72289-9_60.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Atkins, Peter, et Ronald Friedman. « Scattering theory ». Dans Molecular Quantum Mechanics. Oxford University Press, 2010. http://dx.doi.org/10.1093/hesc/9780199541423.003.0014.

Texte intégral

Résumé :

This chapter reviews the difference between electric and magnetic perturbations, noting that the former stretch a molecule, while the latter twist it. It looks at the effect of a twisting perturbation, which is to induce electronic currents that circulate through the framework of the molecule. These currents give rise to their own magnetic fields, noting that one effect is to modify the magnetic flux density in the material. The chapter highlights how the substance is classified as paramagnetic if the flux density is increased beyond that due to the applied field alone. If the flux density is reduced, then the substance is classified as diamagnetic.

Styles APA, Harvard, Vancouver, ISO, etc.

Bensimon, David, Vincent Croquette, Jean-François Allemand, Xavier Michalet et Terence Strick. « Manipulating DNA ». Dans Single-Molecule Studies of Nucleic Acids and Their Proteins, 11–26. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198530923.003.0002.

Texte intégral

Résumé :

This chapter describes the various methods used to manipulate single DNA molecules and the considerations in the choice of one particular method. It starts with a description of DNA end-labelling, necessary to anchor the molecule to surfaces or beads that can be manipulated. A particular application of DNA anchoring is molecular combing, whereby the molecule is stretched on a surface by a receding meniscus. DNA rearrangements and replication bubbles can then be observed by fluorescence on these straightened molecules. It then looks at the forces at the molecular scale, which range from the smallest one due to thermal agitation, to the largest associated with breaking a covalent bond, via entropic and non-covalent bonding forces. It describes the tools used to manipulate single molecules (micro-needles, AFM cantilevers, optical, magnetic, and acoustic tweezers and traps, etc.), comparing their performances in terms of bandwidth and signal to noise (i.e., force and extension resolutions).

Styles APA, Harvard, Vancouver, ISO, etc.

Kennel, Charles F. « The Reconnecting Magnetosphere ». Dans Convection and Substorms. Oxford University Press, 1996. http://dx.doi.org/10.1093/oso/9780195085297.003.0008.

Texte intégral

Résumé :

Dungey’s (1961a) pattern of internal magnetospheric convection was similar to that of Axford and Hines (1961). However, his model made testable statements about the structure of the magnetosphere that were not contained in the viscous convection model. It predicted that solar wind plasma enters the magnetosphere over the polar caps, that open field lines connect the polar caps directly to the interplanetary magnetic field, and that these field lines are stretched into a long, low-density magnetic tail. There would be a current layer separating the two lobes of the tail, and surrounding it, a sheet of relatively dense, hot, earthward-convecting plasma confined by closed field lines. A second magnetic neutral line would terminate the earthward flow region (Levy et al., 1964; Axford et al., 1965; Petschek, 1966; Axford, 1969). To preserve the steady state, reconnection at the tail neutral line had to have the same rate as at the dayside magnetopause. Clearly, the two reconnection regions ought to be major drivers of magnetospheric activity. Yet unambiguous proof of the existence of magnetopause reconnection was not found until 1979, 18 years after the reconnection model was proposed, and no one knew where to look for tail reconnection, because Dungey’s model did not say how far away the tail neutral line was. However, the closure of the slow expansion fans carrying solar wind plasma into the tail lobes was a natural way to force tail reconnection (Coroniti and Kennel, 1979). This closure point is fifty to one hundred earth radii downstream of earth. Twenty-four years were to pass before the average location of the tail neutral line could be established, because no spacecraft until ISEE-3 spent enough time that far downtail. In retrospect, it is a testament to the power of the paradigm that so many would search for so long for direct evidence of dayside and nightside reconnection without jettisoning Dungey’s model altogether. Faith in Dungey’s model was sustained by its collateral predictions. The access of energetic particles of solar origin to the polar cap ionosphere confirmed that reconnection occurs.

Styles APA, Harvard, Vancouver, ISO, etc.

Piotrowski, Marcin, et Patrycja Piotrowska. « Nieinwazyjne badania archeologiczne na stanowisku 2 w Żelaznej Nowej ». Dans Ocalone Dziedzictwo Archeologiczne, 145–52. Wydawnictwo Profil-Archeo ; Muzeum im. Jacka Malczewskiego w Radomiu, 2020. http://dx.doi.org/10.33547/oda-sah.10.zn.13.

Texte intégral

Résumé :

Non-invasive archaeological research was carried within the complex of sites 2–3 in Żelazna Nowa, and the analysis of the results. The basic goal of the research was to determine the range of the necropolis in site 2, to reveal its topography, and to assess the state of its preservation. The research was performed using a non-invasive geophysical survey with the magnetic method. An additional objective was to map sites 2 and 3 and present them against a broader geographic background. The maps were created using numeric altitude data from laser scanning (LIDAR) and aerial photography. Site 2, the focus of the research, occupies a well-defined lentoid elevation stretching along the E-W axis, and it encompasses at least three distinct zones. The first zone is the necropolis in the western part of the site, confirmed by archaeological excavations. Geophysical research allows for concluding that the necropolis extended over an area larger than 1 ha. Its southern and eastern boundaries are discernible on the map of magnetic anomalies (Figs. 13.2–7). The second zone is a stretch of land to the east of the necropolis, distinguished by a distinct concentration of archaeological features. The third zone is an area where settlement features also occur, but in much lesser concentrations than in zone 2. Zones 2 and 3 (the eastern one) are distinguished by considerable numbers of artefacts, potsherds in particular, occurring on the surface. In addition, traces of hearths damaged by ploughing were recorded in zone 3 in the form of black spots of various sizes discernible from the level of the ground, and especially from the air (Fig. 13.8). A distinct concentration of features in zone 2 may stem from its transitional nature between the cemetery and the settlement, perhaps with the two partly overlapping at some stages of their development. However, the relatively clear results of the magnetic research only allow for preliminary interpretation of the identified features. The data need to be verified by archaeological excavations. The non-invasive research, especially the magnetic survey, should undoubtedly be extended. It is also worth taking aerial photographs again, in different weather conditions and especially at the time of year when the crops start to grow. This can be expected to reveal previously undetected features, in particular those of settlement nature.

Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Magnetic stretcher"

Ivenso, Ikenna D., et Todd D. Lillian. « Brownian Dynamics Simulation of the Dynamics of Stretched DNA ». Dans ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-35487.

Texte intégral

Résumé :

DNA is a long flexible polymer and is involved in several fundamental cellular processes such as transcription, replication and chromosome packaging. These processes induce forces and torques in the DNA which deform it. These deformations in turn affect the structure and function of DNA. However, understanding of the dynamic response of DNA to the various forces that act on it is still far from complete. Several experiments have been carried out to study these responses most of which use a micron sized magnetic bead attached to the DNA molecule to both manipulate it and to observe its dynamics. One limitation of this approach is that the dynamics of the DNA molecule has mostly been characterized “indirectly” by observing the dynamics of the magnetic bead. It is also reasonable to expect that, because of the size of the bead relative to that of the DNA, the magnetic bead dynamics will obscure that of the DNA. We adapt existing coarse-grained Brownian dynamics models of DNA to develop a model capable of representing the dynamics of DNA without any of the artifacts inherent to the experiments. This model accounts for bending, torsion, extension, electrostatics, hydrodynamics and the random thermal forces acting on DNA in an electrolyte solution. We then carry out Brownian dynamics simulations with our model to benchmark with well established theoretical results of a stretched polymer in solution. Finally, we employ our model to predict the relaxation time scale for single molecule experiments which sets the framework for future studies in which we plan to further shed light on the dynamics of DNA over long length and time scales.

Styles APA, Harvard, Vancouver, ISO, etc.

Arpaia, P., D. Caiazza, G. Deferne, C. Petrone et S. Russenschuck. « Advances in stretched and oscillating-wire methods for magnetic measurement ». Dans 2015 9th International Conference on Sensing Technology (ICST). IEEE, 2015. http://dx.doi.org/10.1109/icsenst.2015.7438460.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Yang, B. T., G. Meng, P. Y. Xu, X. T. Tan, Z. Q. Feng et D. H. Yang. « Magnetostrictive Blocked-Force Clamping Mechanism for Secure and Heavy-Load Inchworm Motion ». Dans ASME 2009 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2009. http://dx.doi.org/10.1115/smasis2009-1268.

Texte intégral

Résumé :

The capability of inchworm motor for long-displacement, heavy-load and precise positioning is greatly conditioned by the effectiveness of the clamping mechanism. A need exists in the art for clamping mechanism capable of delivering precise and heavy load motion. This paper presents a novel giant magnetostriction material (GMM) application to the development of such mechanism. GMM is advantageous over other smart materials in this particular aspect by its remarkable magnetostriction and especially the huge blocked stress. It can, e.g., display around 4000N at moderate magnetization with a φ25×100mm GMM rod. Most desirably, such large force could be used as clamping force in inchworm movement. However, the force can only be generated under blocked state, which is generally hard to reach, especially in a moving regime. Addressing this problem, the research utilizes GMM rod’s capacity to both positively stretch and negatively contract under permanent-magnet-biased condition and presents a specially designed clamping mechanism, a permanent-magnet-biased actuator fastened in a rigid guideway. Being applied reverse magnetic field, the formerly stretched actuator may contract to a suitable size to be put into the rigid guideway. Then, removal of the field will theoretically result in the restoration of the actuator. Practically, stretching of the actuator is blocked by the rigid guideway. This forms the so-called Pre-blocked-clamping-on state, where no-power fastening behavior exists. Moreover, the blocked force is adjustable. When being applied the same-direction field as the permanent one, the blocked force becomes greater (Blocked-clamping-on state). When being applied adequate reverse field, the blocked force is diminished with the shrinking of the actuator, till the actuator released from the rails (Blocked-clamping-off state). This process realizes the utilization of blocked force in clamping action, thus provides resolution for secure and heavy load inchworm motion. A clamping mechanism prototype (Size:φ32×130mm, with a φ10×100mm GMM rod) has been realized. The design and working process of the setup is presented. Through experiments, the prototype can be facilely manipulated by square-instant and sinusoid-continuing current and it can agilely perform to meet the proposed blocked force the proposed clamping principle.

Styles APA, Harvard, Vancouver, ISO, etc.

Williams, Alicia M., et Pavlos P. Vlachos. « The Dynamics of Accumulating Ferrofluid Aggregates ». Dans ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55101.

Texte intégral

Résumé :

The physics of steady and pulsatile flows laden with superparamagnetic nanoparticles in a square channel accumulating under the influence of a 0.5 Tesla permanent magnet are studied by means of focused shadowgraphs. The accumulation physics of these nanoscale particles is explored as functions of the flow type (steady and unsteady) and accumulation type (injected from the top of channel versus bottom of channel). Ferrofluid is accumulated by the steady injection of a streakline that enters the test section upstream of the magnet, where an aggregate forms. The interfacial phenomena resulting from the interaction of the ferrofluid with the bulk flow is resolved using shadowgraph imaging, where a digital camera captures the side view of the aggregate. Ferrofluid aggregate physics is examined both visually in the raw frames as well as by post-processing to determine the aggregate size evolution in time and couple that bulk information with interfacial behavior using the Proper Orthogonal Decomposition (POD). The shadowgraphs show that the aggregate exhibits different regimes based on bulk flow Reynolds number, which is varied between 100 and 1000, based on the mean flow rate. The aggregate exhibits stable behavior at low Reynolds numbers, where it stretches as it grows and minimal decay of the aggregate occurs. At moderate Reynolds numbers above 400, inertial forces dominate the dynamics, and aggregates do not attain the same size and height as in low Reynolds number cases. Therefore, the interaction of the aggregate with the bulk flow is diminished. The accumulation of ferrofluids is positively impacted by increased magnetic field gradients for some Reynolds numbers, while very high or low magnetic field gradients result in smaller, unstable aggregates. This work is the first to study the accumulation of ferrofluid aggregates over such a large parameter space, which reveals many physics that were previously unexplored in ferrohydrodynamics.

Styles APA, Harvard, Vancouver, ISO, etc.

Matsumoto, Kazuya, Yusuke Morita et Eiji Nakamachi. « Development of Hybrid Electromagnetic and Mechanical Stimulation System for Enhancement of Nerve Axonal Extension ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65593.

Texte intégral

Résumé :

Recently, the electromagnetic and mechanical stimulation have been recognized as the effective extracellular environmental factor to enhance the defected peripheral nerve tissue regeneration. We designed and fabricated a bioreactor device, which can load the uniform AC magnetic field (ACMF) and the uniform tensile strain to stimulate PC12 nerve cell. For ACMF stimulation system, we used the pole piece structure to enable the uniform ACMF and in-situ microscopic observation. We confirmed the uniformity of magnetic field in the experiments. Further, the uniform strain in the stretch stimulation device was confirmed, even a slightly deviation from the designed strain was observed. It was a negligible small error. Next, we validated the effectiveness of PC12 axonal extension enhancement by two stimulation methodologies, ACMF and the cyclic stretch, under individual and combined stimulation conditions. ACMF showed a best enhancement effect on axonal extension, such as 70 μm at 96 h culture period, which rate is larger than the case of control. On the other hand, the stretch stimulation caused the exfoliation of cells. Hybrid stimulation succeeded to inhibit the exfoliation. However, the extensional rate was less than the case of ACMF. These results can be used to fabricate a bioreactor of nerve cell regeneration.

Styles APA, Harvard, Vancouver, ISO, etc.

Arunkumar, K. A. « Ultrasensitive fiber-optic magnetic field sensor ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.thk4.

Texte intégral

Résumé :

We propose a fiber-optic magnetometer capable of both vector and scalar measurements based on a concept different from those using magnetostriction or Faraday rotation.1 The magnetic field measurement is to be done using an all-fiber Mach-Zehnder interferometer. One arm of the Mach-Zehnder will have a metallic coating. Field detection and measurement can be done by sensing the force this conductor will experience in the field when current passes through it. The generated interference pattern is sensitive to change in the interferometer path lengths. One would exploit this fact in developing the FO magnetometer. In the vicinity of a magnetic field, displacement of the current carrying conductor will cause the fiber to bow. The resulting stretch will increase the light path length by δL. δL can be related to the force exerted by the field on the conductor C and hence, to the magnetic field. The direction in which the fiber bows will depend on the magnetic field and current flow directions. Thus, knowing the current flow direction and using a stopper, the magnetic field direction can be inferred. If I is the current passing through C of length I, the force exerted on it by the unknown magnetic field B is F = II × B = / IB⊥. The force displaces the conductor in a direction determined by the above relation.

Styles APA, Harvard, Vancouver, ISO, etc.

Azhari, Weiss, Rogers et Shapiro. « Surface Stretch Analysis Of The Heart Using Tagged Magnetic Resonance Imaging In 3D ». Dans Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.595625.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Azhari, Haim, James L. Weiss, Walter J. Rogers et Edward P. Shapiro. « Surface stretch analysis of the heart using tagged magnetic resonance imaging in 3D ». Dans 1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 1992. http://dx.doi.org/10.1109/iembs.1992.5761034.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Jahanian, Shahriar, et A. J. McPhate. « Approximate Residual Interface Compression in a Laminated Magnet ». Dans ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0072.

Texte intégral

Résumé :

Abstract Present design of large laminated magnets are based on effective modulus of elasticity for the plate stack that is invariant with interplate compression. Experimental results indicates this is not a valid assumption. This analysis considers the specific design used for compact electron storage ring dipole magnet at the Center for Advanced Micro Devices (CAMD) at Louisiana State University. An iterative technique, using FEM is developed to approximate the effective modulus throughout the magnet structure. This particular magnet is constructed from 1424 steel plates (1.5mm × 610mm × 780mm) by first compressing a 45° 2.93m raduis curvilinear stack to a specified preload and then welding straight and curved straps to the exterior of the stack. Release of the preload allowsexpansion of the stack and forces stretch of the straps, the resultant interplate compression is considerably different from the initial preload and varies throughout the magnet. The analysis technique introduced in this paper is a simplified approach to the interplate compression modeling and consists of the supeposition of two simple analysis; one with straps attached, one without straps attached. An iterative approach is used to incorporate the dependence of effective compressive modulus on the interplate compression. An estimate of the average modulus is assumed for the entire stack and residual compression is calculated. From this residual compression and from experimental data, a distribution of compressive modulus throughout the magnet is computed. From this computed distribution, a new estimate for the compressive modulus is made for each element of the model and the analysis iterated. The net results are the compressive modulus distribution throughout the magnet ia a form suitable in subsequent dynamic analysis.

Styles APA, Harvard, Vancouver, ISO, etc.

Ruder, Warren C., Erica D. Pratt, Nailah Z. Brandy, David A. LaVan, Philip R. LeDuc et James F. Antaki. « Stretch-Activated Calcium Signal Propagation Following Mechanical Stimulation of Focal Adhesions ». Dans ASME 2007 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2007. http://dx.doi.org/10.1115/sbc2007-176431.

Texte intégral

Résumé :

Cells translate environmental mechanical stimuli into biochemical reactions that govern a range of cellular processes such as proliferation, death and tissue matrix remodeling. Mechanical activation of individual focal adhesions formed between the cell and its environment directly correspond to several internal responses. Intracellular calcium concentration, [Ca2+]in, has been shown to profoundly change during force sensing. In order to understand this dynamic in cells, we compared calcium mobilization resulting from chemical stimulation and that resulting from mechanical stimulation. We have analyzed the response of fibroblasts to membrane displacements of over 5 μm resulting in eventual spikes in [Ca2+]in. Our data initially indicates that fibroblasts may process mechanical calcium events in unique manner in comparison to other cell types. This finding has implications in a range of fields including mechanobiology and magnetics based activation.

Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Magnetic stretcher"

Lee Y. Y. et G. Danby. THE AGS STRETCHER WITH ROOM TEMPERATURE MAGNETS. Office of Scientific and Technical Information (OSTI), avril 1987. http://dx.doi.org/10.2172/1151188.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Solomon, L. Results of stretched wire field integral measurements on the mini-undulator magnet -- comparison of results obtained from circular and translational motion of the integrating wire. Office of Scientific and Technical Information (OSTI), mai 1998. http://dx.doi.org/10.2172/639797.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

SOLOMON, L. RESULTS OF STRETCHED WIRE FIELD INTEGRAL MEASUREMENTS ON THE MINI-UNDULATOR MAGNET-COMPARISON OF RESULTS OBTAINED FROM CIRCULAR AND TRANSLATIONAL MOTION OF THE INTEGRATING WIRE. Office of Scientific and Technical Information (OSTI), mai 1998. http://dx.doi.org/10.2172/10374.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!