Internal arc-proof switchgear: arc modelling and active protection

Author(s):  
M. Marchi
Keyword(s):  
2021 ◽  
Vol 1855 (1) ◽  
pp. 012036
Author(s):  
Zhenyu Kang ◽  
Juan Lv ◽  
Shuqiang Yuan ◽  
Yazhe Li ◽  
Juan Du

2021 ◽  
Vol 410 ◽  
pp. 566-571
Author(s):  
Svetlana S. Vinogradova ◽  
Ramilya F. Tazieva ◽  
Anna N. Akhmetova

Unique corrosion conditions in oil refining processes lead to the necessity of using passive and active protection systems, aimed at preventing from damages and ensuring the correct operating conditions of machines. To prevent from the development of corrosion processes on the internal surfaces of horizontal settlers, sacrificial protection is used. Before installing such a protection, they usually calculate the number of protectors to be installed in parallel. Some inputs are stochastic by their nature, which should be considered in assessing the risk of non-achieving the required protection level. The probabilistic model proposed to calculate the parameters of sacrificial tank protection that allows performing an exploratory design based on considering various environmental aspects to decide on the efficiency of sacrificial protection and to assess the achievement of the required protection level.


2019 ◽  
Vol 31 (1) ◽  
pp. 85-103
Author(s):  
Piotr Wężyk ◽  
Paweł Hawryło ◽  
Marta Szostak ◽  
Karolina Zięba-Kulawik ◽  
Monika Winczek ◽  
...  

Abstract The aim of the research carried out in 2018 and financed by the Forest Fund was the analysis of biometric features and parameters of pine stands in the area of the “Bory Tucholskie” National Park (PNBT), where a program of active protection of lichen was initiated in 2017. Environmental analyses were conducted in relation to selected biometric features of trees and stands using laser scanning (LiDAR), including ULS (Unmanned Laser Scanning; RIEGL VUX-1) and TLS (Terrestrial Laser Scanning; FARO FOCUS 3D; X130). Thanks to the application of LiDAR technology, the structure of pine stands was precisely determined by means of a series of descriptive statistics characterizing the 3D spatial structure of vegetation. Using the Trees Crown Model (CHM), the analysis of the volume of tree crowns and the volume of space under canopy was performed. For the analysed sub-compartments, GIS solar analyses were carried out for the solar energy reaching the canopy and the ground level due to active protection of lichen. Multispectral photos were obtained using a specialized RedEdge-M camera (MicaSense) mounted on the UAV multi rotor platform Typhoon H520 (Yuneec). Flights with a thermal camera were also performed in order to detect places on the ground with high temperature. Plant indices: NDVI, NDRE, GNDVI and GRVI were also calculated for sub-compartments. The data obtained in 2017 and 2018 were the basis for spatial and temporal analyses of 4-D changes in stands which were related to the removal of some trees and organic layer (litter, moss layer).


Author(s):  
Xia Aiming ◽  
Chen Yang ◽  
Fu Bin ◽  
Wu Fengyu ◽  
Zhang Yuchen

2003 ◽  
Vol 83 (2) ◽  
pp. 19-30 ◽  
Author(s):  
Stevan Stankovic

One of the characteristics of modern society are more massive tourist trends. Tourists overcame all parts of our planet and provoked line of positive and negative phenomena and processes. Positive dominate negative and that?s the reason why many countries develop domicile and foreign tourism. Environment and tourism perform indivisible totality. Contemporary tourism demands important areas of original or well protected environment, because only on this areas can be develops planned and brings economic and social advantages to domicile population (receptive) and to tourists (initiative). Science and practice for needs of tourism considers line of positive relations toward environment, because some of her elements are special tourist values. For need of tourism is underlines need of acceptation principles of active protection environment, because it is always better to plan, than to reclaim negative effects. In work which treats environment, modern tourism and planning, is appeared to scope of international tourism in world and dynamics of tourism development in a last six decades. It was special emphasized relations between tourism and nature, because in many countries offer of natural tourist values is more massive than offer of monuments. It is a word about need of nature protection for tourism, because nature is a real tourist value only when she is authentic or well protected. In second part it was analyzed importance of tourism planning on different levels, considering local and national traits in areas favorable for tourism development.


Author(s):  
Jakub MICHALSKI ◽  
Zbigniew SURMA ◽  
Marta CZYŻEWSKA

This paper presents a selection of deliverables of a research project intended to develop a technology demonstrator for an active protection system smart counterprojectile. Numerical simulations were completed to analyse the effects of geometry and weight of the counterprojectile warhead on the counterprojectile flight (motion) parameters. This paper investigates four variants of the counterprojectile warhead shape and three variants of the counterprojectile warhead weight. Given the investigated geometric and weight variants, the PRODAS software environment was used to develop geometric models of the counterprojectile warhead, followed by the determination of the model aerodynamic characteristics. The final deliverable of this work are the results of the numerical simulation of the counterprojectile motion along the initial flight path length. Given the required activation of the active protection system in direct proximity of the protected object, the analyses of counterprojectile motion parameters were restricted to a distance of ten-odd metres from the counterprojectile launching system.


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