Magnets glued to the backs of experienced pigeons often resulted in disorientation when the birds were released from distances of 17-31 miles (27-50 km) under total overcast, whereas no such disorientation occurred during similar releases under clear skies. The magnets did, however, often cause disorientation when first-flight birds were released under sun, and there was some indication of dist...

In this paper a new technique for the accurate calculation of magnetic fields in the end regions of superconducting accelerator magnets is presented. This method couples Boundary Elements (BEM) which discretize the surface of the iron yoke and Finite Elements (FEM) for the modelling of the nonlinear interior of the yoke. The BEM-FEM method is therefore specially suited for the calculation of 3d...

The ion-optical characteristics of the separator should meet the requirements of the antiproton beam, the parameters of which are given in Table 1. The magnetic bending power is 13 Tm; the transverse acceptance is 240 mm mrad; the momentum acceptance is 6 %. These parameters require magnets with large aperture, especially in the horizontal plane (up to 400 mm). The ion optics of the antiproton ...

NMR imaging was proven in recent years to be a useful noninvasive technique (1). It yives the 3-dimensional structure of tissues in vivo; and exploits the differences in concentration of substances (usually water) and their relaxation times as a means to discriminate between tissues. Methods of chemical shift-imaging were developed recently (2-6) which utilize the differences in substance conte...

An overview of the magnet measurement activities at the Paul Scherrer institute is presented. The talk will mainly focuss on the magnets needed for the X-ray free electron laser (SwissFEL), the next large scale facility in preparation at the Paul Scherrer Institute. Based on a normalconducting 5.8 GeV linear accelerator, the SwissFEL will cover a spectral range of 0.1-10 nm wavelength An amount...

OBJECTIVE To raise awareness of the dangers associated with magnet ingestion in children. DESIGN Case report and review of the literature. SETTING Tertiary care children's hospital. Patient Four-year-old boy with minimal physical findings but with a clinical history and imaging suggesting complications from multiple magnet ingestion. Intervention Laparoscopic removal of magnets and repair o...

We study different configurations of permanent magnets and ferromagnetic circuit, in order to optimize the magnetic field for the so-called “magnetic tweezers” technique, for studing mechanical properties of DNA molecules. The magnetic field is used to pull and twist a micron-sized superparamagnetic bead, tethered to a microscope slide surface by a DNA molecule. The force applied to the bead mu...

Maxwell 3D of Ansoft software were used for this study. Ansoft’s solutions are based on a more general program using Maxwell’s equations. A simple analysis has been done for calculating the magnetic force interacted between two magnets of similar poles facing each other. The modeling in Anosoft has been described.

Superconducting materials for magnets will be discussed from three viewpoints: firstly the basic physical properties of the materials themselves, secondly the constraints and preferences imposed by the requirements of magnet building and finally, the manufacture of magnet conductors as a commercial product.

in daily-life applications and are key components of numerous electronic, data and medical devices as well as of many applications in the automotive sector. The combination of properties of the R sublattice (4f) and the T sublattice (3d) led to the dramatic improvement in the energy density (BH)max of hard magnetic materials during the last two decades. In the case of nanocrystalline R-T compou...