Contactless measurement of electric current using magnetic sensors

We review recent advances in magnetic sensors for DC/AC current transducers, especially novel AMR sensors and integrated fluxgates, and we make critical comparison of their properties. Most contactless electric current transducers use magnetic cores to concentrate the flux generated by the measured current and to shield the sensor against external magnetic fields. In order to achieve this, the magnetic core should be massive. We present coreless current transducers which are lightweight, linear and free of hysteresis and remanence. We also show how to suppress their weak point: crosstalk from external currents and magnetic fields

Vacuum properties in the presence of quantum fluctuations of the quark condensate

The quantum fluctuations of the quark condensate are calculated using a regulated Nambu Jona-Lasinio model. The corresponding quantum fluctuations of the chiral fields are compared to those which are predicted by an ''equivalent'' sigma model. They are found to be large and comparable in size but they do not restore chiral symmetry. The restoration of chiral symmetry is prevented by an ''exchange term'' of the pion field which does not appear in the equivalent sigma model. A vacuum instability is found to be dangerously close when the model is regulated with a sharp 4-momentum cut-off.Comment: latex klein.tex, 11 files, 20 pages Workshop on Few-Quark Problems Bled, Slovenia 2000-07-08 2000-07-16 July 8-16 2000 [SPhT-T00/109

Macroscopic Chromodynamics of a Confining Medium

A nonminimal interaction of the gluon field with a massive antisymmetric tensor order parameter is shown to yield a vanishing dielectric function at tree level. The London-type description of this perfect diaelectric suggests a tractable non-Abelian chromodynamics of the Ginzburg-Landau type which is suitable for describing the confinement-deconfinement phase transition.Comment: 6 pages, late

The Regularization of the Fermion Determinant in Chiral Quark Models

The momentum dependence of the quark self energy gives a physically motivated and consistent regularization of both the real and imaginary parts of the quark loop contribution to the meson action. We show that the amplitudes for anomalous processes are always reproduced correctly.Comment: 12/8 pages (b/l), plain TeX with harvmac, SphT93/13

Solitons in nonlocal chiral quark models

Properties of hedgehog solitons in a chiral quark model with nonlocal regulators are described. We discuss the formation of the hedgehog soliton, the quantization of the baryon number, the energetic stability, the gauging and construction of Noether currents with help of path-ordered P-exponents, and the evaluation of observables. The issue of nonlocality is thoroughly discussed, with a focus on contributions to observables related to the Noether currents. It is shown that with typical model parameters the solitons are not far from the weak nonlocality limit. The methods developed are applicable to solitons in models with separable nonlocal four-fermion interactions.Comment: 42 pages, 8 figures, a new section presenting the results with the chiral-circle constrain

PERANAN CORPORATE SOCIAL RESPONSIBILITY PT. JAYA MANDIRI SUKSES DALAM MENINGKATKAN PEMBANGUNAN DI DESA MUARA LEKA KECAMATAN MUARA MUNTAI

This study aims to determine the role of Corporate Social Responsibility (CSR) in improving rural community development in Muara Leka Village, Muara Muntai District. This study used a qualitative model and analyzed using an interactive data model. The results showed that in the distribution of CSR funds PT. Jaya Mandiri Sukses has been going quite well, but an evaluation is needed. CSR PT. Jaya Mandiri Sukses is divided into three: CSR infrastructure development, human resource development, and community empowerment.Keywords: CSR, development, role

A new Acaralox species (Acari: Prostigmata: Eriophyoidea) on Verbena officinalis L. from Hungary

The female, male and nymph of Acaralox bognari sp. n., associated with Verbena officinalis (Verbenaceae), are described from Hungary. Taxonomically relevant morphological details are illustrated and the species is diagnosed from the similar representatives of the genus