منابع مشابه
Lightning Interception on Elevated Building
-Lightning protection air terminals are placed on structures and other grounded objects with the purpose of capturing the lightning stroke. A well estimation of the lateral protection distance is crucial in predicting the protection area of the lightning rod. This paper focus on a 3-D numerical modelling of lightning attachment based on physical phenomena leading to the formation and the develo...
متن کاملLightning Discharge and Fundamentals of Lightning Protection
A review of lightning protection concepts introduced by Benjamin Franklin (18th century) and James Clerk Maxwell (19th century) is given. Modern approaches to lightning protection of various structures and systems are discussed. In particular, the widely used electrogeometrical model (one version of which is the Rolling Sphere Method) and the topological shielding are presented. Bonding require...
متن کاملLiterary Figures in Gāthic Texts
Introduction Gāthic texts are a collection of religious songs of Zarothustra who lived about 1200 BC. Of the seventy two hāts (stanzas) of Yasna (one of the five chapters of Avesta), seventeen hāts belong to five Gāthas. These seventeen hāts have been classified into five categories based on their syllabic meter and the number of the song: 1) ahunavaiti, 2) ushtavaiti, 3)spanta.mainyu, ...
متن کاملEffects of lightning-NOx on tropospheric chemistry
The impact of different assumptions concerning the source magnitude as well as the vertical placement of lightning-produced nitrogen oxides is studied using the global chemistry transport model MATCH-MPIC. The responses of NO x , O 3 , OH, HNO 3 and peroxyacetyl-nitrate (PAN) are investigated. A marked sensitivity to both parameters 5 was found. NO x burdens globally can be enhanced up to 100% ...
متن کاملOn phenomenology of compact intracloud lightning discharges
[1] We examined wideband electric fields, electric and magnetic field derivatives, and narrowband VHF (36 MHz) radiation bursts produced by 157 compact intracloud discharges (CIDs). These poorly understood lightning events appear to be the strongest natural producers of HF‐VHF radiation. All the events transported negative charge upward (or lowered positive charge), 150 were located by the U.S....
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ژورنال
عنوان ژورنال: Nature
سال: 1875
ISSN: 0028-0836,1476-4687
DOI: 10.1038/012009a0