At NMIJ/AIST, there are two divisions in the electrical standards area. One is the Electricity and Magnetism (EM) Division and the other is the Electromagnetic Waves Division. The former covers low frequency electrical standards and the latter high frequency and electromagnetic field standards. The EM division has two sections, the Applied Electrical Standards Section and the Quantum Electrical...

The evaluation of the exposure from mobile communication devices requires consideration of electromagnetic fields (EMFs) over a broad frequency range from dc to GHz. Mobile phones in operation have prominent spectral components in the low-frequency (LF) and radio-frequency (RF) ranges. While the exposure to RF fields from mobile phones has been comprehensively assessed in the past, the LF field...

The common way to produce the accelerating electromagnetic fields in cyclic accelerators is to excite standing waves in accelerating cavities. The mathematical model for these high frequency electromagnetic fields is the eigenvalue problem solving the Maxwell equations in a bounded volume [1]. Usually, the eigenfield corresponding to the fundamental mode of the cavity is used as the acceleratin...

In respect of imaging quality and patient safety, temperature rises and SAR distributions, which are caused by interaction of the applied electromagnetic fields during MR exams, are of high interest for implants in MR tomography [1]. High local SAR values are equivalent to high local temperature increases [2]. For developing support for radio frequency (RF) induced heating experiments, SAR valu...

An implicit assumption of risk perception studies is that concerns expressed in questionnaires reflect concerns in everyday life. The aim of the present study is to check this assumption, i.e., the extrapolability of risk perceptions expressed in a survey, to risk perceptions in everyday life. To that end, risk perceptions were measured by a multidimensional approach. In addition to the traditi...

The purpose of this paper is to review recent research on the applications of existing non-destructive testing (NDT) techniques, especially radio frequency (RF) NDT, for carbon-fibre reinforced plastics (CFRP) composites. Electromagnetic properties of CFRP composites that are associated with RF NDT are discussed first. The anisotropic characteristic of the conductivity and the relationship betw...

background: the rapidly increasing use of mobile phones has led to public concerns about possible health effects of these popular communication devices. this study is an attempt to investigate the effects of radiofrequency (rf) radiation produced by gsm mobile phones on the insulin release in rats. methods: forty two female adult sprague dawley rats were randomly divided into 4 groups. group1 w...

Radio Frequency Identification is a technology where data is transmitted via radio waves on the electromagnetic spectrum. An RFID system consists of a radio frequency transceiver which both transmits and receives signals, and a miniature transponder in the form of an RFID “tag” that houses an antenna for receiving signals and a tiny chip containing the RF circuitry and the information to be tra...

accessory pathways (ap) are abnormal myocardial connections between atria and ventricles with electrical conductive properties. we performed radio frequency (rf) catheter ablation in 66 patients with manifest ap at dr.shariati hospital during 5 years. bipolar mapping was used in 48 patients and unipolar mapping in 18 patients of find the best site for rf energy delivery. we calculated total dur...