scholarly journals The GN-z11-Flash Event can be a Satellite Glint

2021 ◽  
Vol 5 (2) ◽  
pp. 27
Author(s):  
Guy Nir ◽  
Eran O. Ofek ◽  
Avishay Gal-Yam
Keyword(s):  
Flash Event

scholarly journals Gd/Sm-Pr Co-Doped Ceria: A First Report of the Precipitation Method Effect on Flash Sintering

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1218 ◽  
Author(s):  
Luca Spiridigliozzi ◽  
Lorenzo Pinter ◽  
Mattia Biesuz ◽  
Gianfranco Dell’Agli ◽  
Grazia Accardo ◽  
...  
Keyword(s):  
Ammonia Solution ◽  
Current Control ◽  
Precipitation Method ◽  
Precipitation Process ◽  
Sintering Behavior ◽  
Method Effect ◽  
Flash Sintering ◽  
Co Precipitation ◽  
First Time ◽  
Flash Event

In this work, ceria-based ceramics with the composition Gd0.14Pr0.06Ce0.8O2-δ and Sm0.14Pr0.06Ce0.8O2-δ, were synthesized by a simple co-precipitation process using either ammonium carbonate or ammonia solution as a precipitating agent. After the calcination, all of the produced samples were constituted by fluorite-structured ceria only, thus showing that both dopant and co-dopant cations were dissolved in the fluorite lattice. The ceria-based nanopowders were uniaxially compacted and consequently flash-sintered using different electrical cycles (including current-ramps). Different results were obtained as a function of both the adopted precipitating agent and the applied electrical cycle. In particular, highly densified products were obtained using current-ramps instead of “traditional” flash treatments (with the power source switching from voltage to current control at the flash event). Moreover, the powders that were synthesized using ammonia solution exhibited a low tendency to hotspot formation, whereas the materials obtained using carbonates as the precipitating agent were highly inhomogeneous. This points out for the first time the unexpected relevance of the precipitating agent (and of the powder shape/degree of agglomeration) for the flash sintering behavior.

Flash sintering scaling-up challenges: Influence of the sample size on the microstructure and onset temperature of the flash event

2020 ◽  
Vol 186 ◽  
pp. 1-5
Author(s):  
João V. Campos ◽  
Isabela R. Lavagnini ◽  
João G. Pereira da Silva ◽  
Julieta A. Ferreira ◽  
Rafael V. Sousa ◽  
...  
Keyword(s):  
Sample Size ◽  
Scaling Up ◽  
Onset Temperature ◽  
Flash Sintering ◽  
Flash Event

Entity-based Parameterization for Distinguishing Distributed Denial of Service from Flash Events

2018 ◽  
Vol 7 (2.14) ◽  
pp. 5
Author(s):  
M A Mohamed ◽  
N Jamil ◽  
A F Abidin ◽  
M M Din ◽  
W N S W Nik ◽  
...  
Keyword(s):  
Image Processing ◽  
Information Theory ◽  
Load Balancing ◽  
Denial Of Service ◽  
Main Concern ◽  
Distributed Denial Of Service ◽  
Ddos Attack ◽  
Processing Power ◽  
Normal Network ◽  
Flash Event

In a perfect condition, there are only normal network traffic and sometimes flash event traffics due to some eye-catching or heart-breaking events. Nevertheless, both events carry legitimate requests and contents to the server. Flash event traffic can be massive and damaging to the availability of the server. However,  it can easily be remedied by hardware solutions such as adding extra processing power and memory devices and software solution such as load balancing. In contrast, a collection of illegal traffic requests produced during distributed denial of service (DDoS) attack tries to cause damage to the server and thus is considered as dangerous where prevention, detection and reaction are imminent in case of occurrence. In this paper, the detection of attacks by distinguishing it from legal traffic is of our main concern. Initially, we categorize the parameters involved in the attacks in relation to their entities. Further, we examine different concepts and techniques from information theory and image processing domain that takes the aforementioned parameters as input and in turn decides whether an attack has occurred. In addition to that, we also pointed out the advantages for each technique, as well as any possible weakness for possible future works. 

Spatially resolved measurement of arc flash event based on transmission loss of plastic optical fiber

2017 ◽  
Author(s):  
Youngwoong Kim ◽  
Hoonil Jeong ◽  
Young Ho Kim ◽  
Byung Sup Rho ◽  
Myoung Jin Kim
Keyword(s):  
Optical Fiber ◽  
Transmission Loss ◽  
Plastic Optical Fiber ◽  
Spatially Resolved ◽  
Arc Flash ◽  
Event Based ◽  
Flash Event

scholarly journals IEEE 13-Node Incident Energy Analysis Using Online Platform

2021 ◽  
Author(s):  
MARINA CAMPONOGARA ◽  
ANA PAULA GHESTI MARCHESAN ◽  
DANIEL PINHEIRO BERNARDON ◽  
RAFAEL GRESSLER MILBRADT ◽  
TIAGO BANDEIRA MARCHESAN ◽  
...  
Keyword(s):  
Incident Energy ◽  
Energy Analysis ◽  
Energy Levels ◽  
Electric Arc ◽  
Protective Equipment ◽  
Boundary Values ◽  
Online Platform ◽  
Three Phase ◽  
Arc Flash ◽  
Flash Event

The thermal hazard is considered the most significant hazard from an arc flash event. The protection against this type of hazard is associated with the assessment of incident energy, a study that aims to analyze the possibility of occurrence of an electric arc, the incident energy produced by it and the necessary protections so that the work in electricity is safe. An incident energy analysis is performed to the 634 bus of IEEE 13 Node system using the ATP Draw software to simulate a three-phase shot-circuit and an online platform that runs the IEEE Std 1584-2018 model is employed to obtain the incident energy levels and arc-flash boundary values for different durations of arcing event. As a closing, the personal protective equipment required for the different time scenarios are analyzed, according to the two approaches proposed in NFPA 70E-2021.

scholarly journals Analisis Variasi Ketebalan Coating Senyawa Glasir terhadap Daya Tahan Dielektrik Isolator Keramik Saluran Transmisi 150kV

2021 ◽  
Vol 9 (2) ◽  
pp. 249
Author(s):  
YUSRENI WARMI ◽  
KAZNI FEBRIAN
Keyword(s):  
Fuzzy Logic ◽  
Breakdown Voltage ◽  
Event Time ◽  
Flashover Voltage ◽  
Simulation Results ◽  
Flash Event

ABSTRAKPenelitian ini bertujuan untuk mengetahui seberapa besar nilai coating isolator yang dapat ditembus listrik berdasarkan Basic Insulator Level (BIL). Metode yang digunakan dalam perhitungan tegangan tembus listrik ialah metode Anderson dalam hal ini Critical Fashover (CFO). Untuk mengetahui penurunan daya tahan dielektrik isolator dapat dilihat dari seberapa besar tegangan flashover yang dihasilkan. Hasil dari perhitungan disimulasikan dengan MATLAB logika fuzzy. Pada penelitian ini ketika isolator disetting pada coating 0,3 mm dengan waktu kejadian flash 2 μs maka tegangan flashover yang dihasilkan sebesar 1,3 MV. Hasil simulasi ini menunjukan bahwa pada coating 0,3 mm tegangan flashover yang dihasilkan melebihi dari BIL isolator yang sudah ditetapkan yakni sebesar 1,27 MV. Isolator dalam kondisi seperti ini dapat ditembus listrik atau daya tahan dielektriknya menurun. Secara bersamaan ketika kemampuan coating berkurang, maka dapat diklasifikasikan isolator dalam keadaan kotor.Kata kunci: isolator, coating, dielektrik, BIL, dan fashover ABSTRACTThis research aims to determine the value of the insulator that can be penetrated by electricity based on the Basic Insulator Level (BIL). The method used in the calculation of breakdown voltage is the Anderson method, in this case, Critical Flashover (CFO). To know a decrease in the dielectric resistance of the insulator can be seen from whatever the voltage resulting from a large flashover. The results of the calculations simulated with fuzzy logic Matlab. In this research, when the insulator set on a coating of 0.3 mm with a flash event time of 2 μs, then flashover voltage resulted in 1.3 MV. The simulation results show that at the coating 0.3 mm the result of flashover voltage exceeds the BIL insulator that has been set at 1.27 MV. Insulator in this condition can be penetrated by electricity or the dielectric resistance decreases. Simultaneously when the coating ability is reduced, then can be classified as a dirty insulator.Keyword: insulator, coating, dielectric, BIL, and flashover

scholarly journals Implementing Flash Event Discrimination in IP Traceback using Shark Smell Optimisation Algorithm

2019 ◽  
pp. 259-268
Author(s):  
Omoniyi Wale Salami ◽  
Imeh Jarlath Umoh ◽  
Emmanuel Adewale Adedokun ◽  
Muhammed Bashir Muazu
Keyword(s):  
Network Flow ◽  
Denial Of Service ◽  
Internet Protocol ◽  
Sudden Increase ◽  
Ip Traceback ◽  
Denial Of Service Attack ◽  
Base Method ◽  
Service Attack ◽  
Or Organization ◽  
Flash Event

 Denial of service attack and its variants are the largest ravaging network problems. They are used to cause damage to network by disrupting its services in order to harm a business or organization. Flash event is a network phenomenon that causes surge in normal network flow due to sudden increase in number of network users, To curtail the menace of the Denial of service attack it is pertinent to expose the perpetrator and take appropriate action against it. Internet protocol traceback is a network forensic tool that is used to identify source of an Internet protocol packet. Most of presently available Internet protocol traceback tools that are based on bio-inspired algorithm employ flow-based search method for tracing source of a Denial of service attack without facility to differentiate flash event from the attack. Surge in network due to flash event can mislead such a traceback tool that uses flow-based search. This work present a solution that uses hop-by-hop search with an incorporated discrimination policy implemented by shark smell optimization algorithm to differentiate the attack traffic from other traffics. It was tested on performance and convergence against an existing bio-inspired traceback tool that uses flow-base method and yielded outstanding results in all the tests

Sign in / Sign up

Export Citation Format

Share Document