Electric field strength specification method under 80 cm for RF immunity testing

Electric field distribution below 80 cm should be specified to test the RF immunity of the floor-standing equipment. To determine this specification, a model in which the equipment is set on an infinite ground plane was used. Calculations using the moment method show that the height pattern of the field below 80 cm is independent of frequency. The height pattern measured in a room is close to the calculated pattern in this model. Experiments show that a suitable electric field can be almost generated by arranging RF absorbers on the floor of a semi-anechoic chamber.1993 International Symposium on Electromagnetic Compatibility, 9-13 August, 1993, Dallas, TX, US

Evaluation of the correlation between RF immunity test facilities using a conductive sphere

Various RF immunity test facilities, such as the semi-anechoic chamber, the giga-hretz TEM cell (GTEM cell) and he TEM cell, have been developed. However, the correlations among the test results measured in these facilities has not been clarified. This paper evaluates these correlations by comparing the calculated values of the electric field scattered by a conductive sphere in free space and the measured values in these facilities. The investigation shows that the deviation of measured value becomes smallest when measured in the semi-anechoic chamber.1994 International Symposium on Electromagnetic Compatibility (EMC\u2794/Sendai), May 16 - 20, 1994, Hotel Sendai Plaza, Miyagi, Japa

Electromagnetic Field Distribution of a Wire-rhombic Antenna for Immunity Testing of Large Telecommunication Equipment

Radio-frequency immunity testing equipment which can irradiate large equipment with both vertical and horizontal electric field at low frequencies which uses wire-rhombic antenna is described. The relationship between antenna size and electric field distribution is analyzed using static electric field approximation. An antenna that is 12.0m long, 4.5m wide and 3.5m high is constructed in a semi-anechoic chamber, and the electric field distribution is measured. The results show that the deviation between calculated and measured value is within 1dB for the vertical electric field and within 3dB for the horizontal field. The field strength of 10V/m is obtained when the antenna is fed with about 8W of power for the vertical field and 250W, for the horizontal field.International Symposium on Antennas and Propagation (ISAP1992), September 22-25, 1992, Sapporo, Japa

Investigation of Electromagnetic Noise Transmission Characteristics from AC Mains Port to Telecommunication Port

A method of evaluating the isolation factor from an AC mains port to a telecommunication port was investigated. Telecommunication equipment was represented by a 4-port network consisting of a pair of wire and ground. The relationship between input and output signals of the network was represented by an F-matrix and the isolation factor (ratio of input to output signals) was derived from the matrix. We developed a method of measuring the parameters and the measured values for a resistance-network agree well with calculated ones. The evaluation results of the isolation factor for three types of telecommunication equipment show that isolation for differential-mode noise from AC mains to telecommunication ports is larger than that for common-mode noise.2003 IEEE Symposium on Electromagnetic Compatibility, August 18-22, 2003, Bosto

Investigation of Relation between EFTB Test and RF Conductive Immunity Test Using BER and Baseband Signal

High-speed telecommunication systems are influenced by electromagnetic environments because they need a wide bandwidth to transmit signals. Immunity tests of telecommunication equipment are effective for improving its immunity to electromagnetic environments. However, immunity tests are expensive to carry out because there are several different tests. The correlation among the tests should therefore be examined in order to reduce the kinds of tests that are necessary. This paper investigates the correlation between the electrical fast transient/burst (EFTB) test and the radio frequency (RF) conductive immunity test. Imitation equipment was constructed with a balun, and a baseband signal was transmitted from the associated equipment to the imitation equipment. Then, disturbances were applied to the equipment, and the telecommunication quality was evaluated by using the bit error rate (BER). The results from the EFTB test indicated that the BER was less than 6×10 −5 and the value was independent of the peak value. The results from the RF conductive immunity test indicated that the BER was affected by the longitudinal conversion loss (LCL)

Identification of semen from criminal materials by means of paper chromatography--a forensic-medical study

In the present experiments attempts were made to identify semen from various specimens such as the semen itself, spots of semen on clothes, putrefied semen or semen contaminated with blood, menstrual blood, vaginal fluid, according to the techniques of LEVONEN. As the result it has been clarified that in every instance it is possible to isolate and detect the spots of choline by spraying Dragehdorff's reagent.</p

Evaluation of Longitudinal Conversion Loss (LCL) for Indoor AC Mains Line

Influence to electromagnetic environment has been studied for power line communication (PLC). Longitudinal conversion loss (LCL) and input impedance are important parameters to evaluate the influence. Indoor AC mains line is modeled considering with typical conditions of Japanese house. The modeled line and electric equipment are presented with 4-port F-matrixes. The parameters of 4-port F-matrix are determined from calculation and measurement. Using this model, the input impedance and the LCL are calculated. The analysis model is examined by a simple network, and the results show that the calculation values almost agree with the measured values. The input impedance and the LCL are investigated for actual AC mains line, and the measured results almost agree with the calculated value.2003 IEEE Symposium on Electromagnetic Compatibility, August 18-22, 2003, Boston, MA, US

A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey

We report the discovery of a new ultra-faint dwarf satellite companion of the Milky Way based on the early survey data from the Hyper Suprime-Cam Subaru Strategic Program. This new satellite, Virgo I, which is located in the constellation of Virgo, has been identified as a statistically significant (5.5 sigma) spatial overdensity of star-like objects with a well-defined main sequence and red giant branch in their color-magnitude diagram. The significance of this overdensity increases to 10.8 sigma when the relevant isochrone filter is adopted for the search. Based on the distribution of the stars around the likely main sequence turn-off at r ~ 24 mag, the distance to Virgo I is estimated as 87 kpc, and its most likely absolute magnitude calculated from a Monte Carlo analysis is M_V = -0.8 +/- 0.9 mag. This stellar system has an extended spatial distribution with a half-light radius of 38 +12/-11 pc, which clearly distinguishes it from a globular cluster with comparable luminosity. Thus, Virgo I is one of the faintest dwarf satellites known and is located beyond the reach of the Sloan Digital Sky Survey. This demonstrates the power of this survey program to identify very faint dwarf satellites. This discovery of VirgoI is based only on about 100 square degrees of data, thus a large number of faint dwarf satellites are likely to exist in the outer halo of the Milky Way.Comment: typos are corrected, 6 pages, 4 figures, accepted for publication in Ap

A Study of PLC Signal Influence on VDSL System by Induction between Indoor Power Line and Telecommunication Line

Due to the progress of information technology in recent years, power line communication (PLC) can be considered as a solution for configuring an indoor communication system. However, the influence on other systems caused by PLC signal induction has not yet been investigated. This paper presents a study on that influence. The induction voltage to a telecommunication line was analyzed by using an 8-port network. The calculation results nearly agree with the measurements. The investigation using a very high bit rate digital subscriber line (VDSL) modem indicates that the VDSL communication may not be degraded under normal conditions for the system using the experiment.2004 International Symposium on Electromagnetic Compatibility (EMC\u2704/Sendai), June 1-4, 2004, Sendai International Center, Sendai, Japa