The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform

Edward J. Larson - One of the best experts on this subject based on the ideXlab platform.

  • Public science for a global empire: The British quest for the South Magnetic Pole.
    Isis; an international review devoted to the history of science and its cultural influences, 2011
    Co-Authors: Edward J. Larson
    Abstract:

    It is well known to historians of science that, early in the nineteenth century, terrestrial magnetism became both a popular science and a significant research enterprise in Europe. For Britain, as a maritime power, it offered benefits for navigation. Theoretical physicists claimed that, with enough observations of Magnetic variation, intensity, and dip taken throughout the world over time, they could deduce regular mathematical laws to explain the phenomena. Because of the lack of data from the region, particular attention focused on field research in deep southern latitudes. Finding the precise location of the South Magnetic Pole became a prime goal for some enthusiasts. With burgeoning colonies in Africa and the Antipodes, Britain assumed a leading role in this effort. British scientists looked to their government for funding and called on the Admiralty to dispatch expeditions. It is less well known that both popular and scientific interest in terrestrial magnetism continued throughout the nineteenth century and into the early twentieth century. The H.M.S. Erebus and H.M.S. Terror (1839-1843), H.M.S. Challenger (1872-1876), and R.Y. Discovery (1901-1904) sailed to the Antarctic as part of Britain's extended "Magnetic Crusade," which culminated with Royal Society geologist T. W. Edgeworth David of the Nimrod expedition reaching the South Magnetic Pole in 1909.

Jingbo Liu - One of the best experts on this subject based on the ideXlab platform.

Yukio Takeda - One of the best experts on this subject based on the ideXlab platform.

  • ICRA - Development of a 3D-Magnetic tweezer system having Magnetic Pole positioning mechanism
    2016 IEEE International Conference on Robotics and Automation (ICRA), 2016
    Co-Authors: Daisuke Matsuura, Hitoshi Aoki, Yukio Takeda
    Abstract:

    This paper discusses the design and implementation of a three dimensional Magnetic tweezer system to achieve measurement of mechanical properties of living cells by touching a Magnetically levitated micro probe to specimen cells. The system consists of a three dimensional Magnetic tweezer, an inverted optical microscope for 3D probe position measurement, and control/interface software. For reducing assembly error in the Magnetic tweezer and accurate adjustment of the gap distance between sextuple Magnetic Poles that are sharpen-tipped permalloy rods having a driving coil on each, a Pole positioning mechanism was implemented in the Magnetic tweezer. Finally, two experiments were performed on the fabricated prototype: trajectory tracking in which a Magnetic particle of 4.5µm diameter floating in medium was steered to follow target trajectories, and homogeneity evaluation that compared force generation from each Magnetic Pole.

François Rossi - One of the best experts on this subject based on the ideXlab platform.

  • Electrical description of a Magnetic Pole enhanced inductively coupled plasma source: Refinement of the transformer model by reverse electroMagnetic modeling
    Journal of Applied Physics, 2006
    Co-Authors: T. Meziani, Pascal Colpo, François Rossi
    Abstract:

    The Magnetic Pole enhanced inductively coupled source (MaPE-ICP) is an innovative low-pressure plasma source that allows for high plasma density and high plasma uniformity, as well as large-area plasma generation. This article presents an electrical characterization of this source, and the experimental measurements are compared to the results obtained after modeling the source by the equivalent circuit of the transformer. In particular, the method applied consists in performing a reverse electroMagnetic modeling of the source by providing the measured plasma parameters such as plasma density and electron temperature as an input, and computing the total impedance seen at the primary of the transformer. The impedance results given by the model are compared to the experimental results. This approach allows for a more comprehensive refinement of the electrical model in order to obtain a better fitting of the results. The electrical characteristics of the system, and in particular the total impedance, were mea...

  • Design of a Magnetic-Pole enhanced inductively coupled plasma source
    Plasma Sources Science and Technology, 2001
    Co-Authors: T. Meziani, Pascal Colpo, François Rossi
    Abstract:

    The trend towards large-area substrates stressed by the semiconductor and flat panel display (FPD) industries is propelling the large-area plasma source developments. In this work, a novel inductively coupled plasma source enabling large-area plasma production is presented: the Magnetic-Pole-enhanced inductively coupled plasma source (MaPE-ICP). The plasma source is based on the use of a coil inductor embedded within a high Magnetic permeability Pole to enhance the Magnetic coupling between the coil and the plasma. A 200 mm MaPE-ICP source has been fully characterized by Langmuir probe, Magnetic induction probe and RF electrical parameter measurements. The plasma characteristics are compared to classical ICP source performances. RF electrical parameter measurements show that the current needed to sustain the plasma is halved with the use of a Magnetic Pole, thus lowering the coil resistive losses. The plasma uniformity is improved compared to that of a spiral coil source, with only a 5.5% variation within the area of the coil radius at 5 mTorr argon pressure. Preliminary plasma uniformity measurements carried out on a 800 mm×800 mm source show that a non-uniformity of 20% from the average values is achieved over 600 mm with more than 1011 ion cm-3. This demonstrates that the use of a Magnetic Pole to concentrate the Magnetic flux is a key asset for scaling up ICPs.

Guy Lemarquand - One of the best experts on this subject based on the ideXlab platform.

  • Calculation of ironless permanent magnet couplings using semi‐numerical Magnetic Pole theory method
    COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2001
    Co-Authors: Jean Frédéric Charpentier, Guy Lemarquand
    Abstract:

    This paper deals with a way of computation of the mechanical behavior of Permanent Magnet synchronous couplings . This method is based on the calculation of the forces between the magnets of the device. The formulation of these forces is based on Magnetic Pole theory. The computation is done using a semi-numerical integration method. This method has been validated in test cases and appears to be very advantageous in terms of calculation time and precision. So this solution appears to be a good way to study and design this kind of devices.International audienceThis paper deals with a way of computation of the mechanical behavior of Permanent Magnet synchronous couplings . This method is based on the calculation of the forces between the magnets of the device. The formulation of these forces is based on Magnetic Pole theory. The computation is done using a semi-numerical integration method. This method has been validated in test cases and appears to be very advantageous in terms of calculation time and precision. So this solution appears to be a good way to study and design this kind of devices

  • Calculation of ironless Permanent Magnet couplings using semi numerical Magnetic Pole theory method
    COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2001
    Co-Authors: Jean Frédéric Charpentier, Guy Lemarquand
    Abstract:

    This paper deals with a way of computation of the mechanical behavior of Permanent Magnet synchronous couplings . This method is based on the calculation of the forces between the magnets of the device. The formulation of these forces is based on Magnetic Pole theory. The computation is done using a semi-numerical integration method. This method has been validated in test cases and appears to be very advantageous in terms of calculation time and precision. So this solution appears to be a good way to study and design this kind of devices.