A new dual-type source has been constructing on the basis of electron cyclotron resonance (ECR) plasma for producing synthesized ion beams in Osaka Univ. Magnetic field in the 1st stage consists of all permanent magnets, i.e., cylindrically comb shaped one, and that of the 2nd stage consists of a pair of mirror coil, a supplemental coil and the octupole magnets. Both stage plasmas can be indivi...

Multiple-$Q$ magnetic states often induce nontrivial topological spin textures, such as a skyrmion and hedgehog. We theoretically investigate yet another multiple-$Q$ state with defects, meron-antimeron crystal (MAX), represented by periodic array of the meron antimeron half-integer number. Performing simulated annealing for an effective model noncentrosymmetric itinerant magnets on triangular ...

INTRODUCTION Magnet ingestion usually does not cause serious complications, but in case of multiple magnet ingestion or ingestion of magnet with other metal it could cause intestinal obstruction, fistula formation or even perforation. CASE REPORT We report case of intestinal obstruction and fistula formation following ingestion of 25 magnets in a 2-year-old girl. Intraoperatively omega shaped...

In the paper presented here the optimization of Halbach arrays as storage media for mechanical potential energy is investigated with numerical simulations using FEMM and analytical calculations using the Maxwell stress tensor. Two opposing Halbach arrays form a “magnetic spring” and mechanical potential energy is stored when this structure is compressed. It is here seen that the wavelength of t...

septum in a large mid-esophageal diverticulum A 72-year-old man who was complaining of dysphagia, regurgitation, and difficulty with passage through the esophagus was diagnosed with a mid-esophageal diverticulum with a diameter of 40mm. A contrast esophagogram (●" Fig.1), a computed tomography (CT) scan (●" Fig.2), and an endoscopic examination revealed that the diverticulum had a narrow neck a...

background in this study, given the importance of gastrointestinal anastomosis in surgical procedures, attempts have been made to compare the results of employing magnetic compression anastomosis and magnetic coils in intestinal anastomosis of rats. materials and methods this study was an experimental trial on 60 rats which had been randomly divided into two experiment (30) and control (30) gro...

To effectively simplify system structure and improve power density and efficiency, a design for a motor/generator suitable for flywheel energy storage system (FESS) is proposed. The machine is an outer-rotor and coreless-stator-type bearingless permanent magnet synchronous motor (BPMSM) with a Halbach array. Firstly, the operation principle of the outer-rotor BPMSM is described. Then, the struc...

Permanent magnet variable flux sources are produced by rotating two nested N-segment, permanent magnet, Halbach cylinders. Torque is primarily an end effect, determined by field non-uniformities due to the fmite length and' segmented structure of the cylinders. Due to symmetry, one cylinder experiences zero torque In a uniform applied field. Experiment and numerical simulation reveal that the t...

There is an increasing need to incorporate an actively controlled drug delivery system (DDS) into the next generation of capsule endoscopy in order to treat diseases in the gastrointestinal tract in a noninvasive way. Despite a number of attempts to magnetically actuate drug delivery mechanisms embedded in endoscopic capsules, longer operating distances and further miniaturization of on-board c...