Technical Briefing on the Radiological Situation in Japan, 19 March 2011

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This technical briefing provides radiation measurements from areas in Japan following the Fukushima Daiichi nuclear disaster. It includes gamma dose rates in various prefectures near the plant that were as high as 2.9 microSv/h. The document also discusses the resulting exposure pathways from the radioactive plume, including external exposure from the cloud and inhalation of contaminated air. Background radiation levels are shown to have increased over several dates in March 2011 in the aftermath of the incident.

Technology

Technical Briefing on theRadiological Situation in Japan 19th March 2011

Gamma-dose rate in microSv/h in various Prefectures 2

Gamma-dose rate at Togichi, 140 km South West (microSv/h) Passage of the radioactive plume Resulting exposure pathways are ,[object Object]

Inhalation of contaminated air during the passage of the plumeBackground 14 March 16 March 17 March 15 March

IAEA Environmental Measurements in Japan 19 March 2011 at public locations

Recent IAEA Environmental Measurements in Japan 19 March 2011 at selected locations Location: Hasuda (Saitama Prefecture), 25 km from Tokyo ,[object Object]

Abstract The Effective utilization of the radiofrequency electromagnetic spectrum is paramount for wireless communication systems especially in telecommunication. This paper presents measurements and analysis of spectrum occupancy in the telecommunication frequency bands performed in Kampala, Uganda in March 2015. The telecommunication bands considered in this study are GSM900, GSM1800, UMTS2100 and LTE2600. Occupancy measurements have been carried out in an outdoor setting using the Aaronia Hyperlog 70600 antenna and the Spectran HF-6065 V4.The analysis shows that the licensed telecommunication spectrum bands are not fully utilized. Highest spectrum occupancy of 52.4% was observed in the GSM900 Downlink telecommunication band while the lowest occupancy of approximately 0% was observed in the LTE2600 band. Key words: spectrum occupancy, wireless telecommunication, Duty cycle, Threshold

Review on electromagnetic interference and compatibilityAlexander Decker

Air pollution monitoring system using LoRa modul as transceiver system

TELKOMNIKA JOURNAL

Air pollution is a disaster that can indirectly interfere with human health, Indonesia is the third highest country in the world that has pollution levels, one of the types of pollution that threatens public health is the increase of CO, NO2 and SO2 level in the air. With the increasing level of air pollution in the city, it requires a device that can monitor air pollution in a real time. By integrating air sensor and Raspberry Pi as data processor and using LoRa module as transceiver module, then the process of transmitting data from transmitter to receiver can be done directly without connected internet. In a test, the system can transmit intensity data information by wireless system on Line Of Sight (LOS) scemes at a maximum distance of 1.7 Km and Non Line Of Sight (NLOS) scheme at a distance of 400 meters with a average delay is 2 second.

The purpose of this study is to determine the relative advantage of using a helically coiled heat exchanger against a straight tube heat exchanger. It is found that the heat transfer in helical circular tubes is higher as compared to Straight tube due to their shape. Helical coils offer advantageous over straight tubes due to their compactness and increased heat transfer coefficient. The increased heat transfer coefficients are a consequence of the curvature of the coil, which induces centrifugal forces to act on the moving fluid, resulting in the development of secondary flow. The curvature of the coil governs the centrifugal force while the pitch (or helix angle) influences the torsion to which the fluid is subjected to. The centrifugal force results in the development of secondary flow. Due to the curvature effect, the fluid streams in the outer side of the pipe moves faster than the fluid streams in the inner side of the pipe. The difference in velocity sets-in secondary flows, whose pattern changes with the Dean number of the flow. In current work the fluid to fluid heat exchange is taken into consideration, Most of the investigations on heat transfer coefficients are for constant wall temperature or constant heat flux. The effectiveness, overall heat transfer coefficient, effect of coldwater flow rate on effectiveness of heat exchanger when hot water mass flow rate is kept constant and effect of hot water flow rate on effectiveness when cold water flow rate kept constant studied and compared for parallel flow, counter flow arrangement of Helical coil and Straight tube heat exchangers. The inner heat transfer coefficient calculated from Wilson plot method. Then Nusselt no and correlation obtained on the basis of inner heat transfer coefficient. All readings were taken at steady state condition of heat exchanger. The result shows that the heat transfer coefficient is affected by the geometry of the heat exchanger. Helical coil heat exchanger are superior in all aspect studied here.

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