Search results for "Explosion"
showing 10 items of 51 documents
Online Principal Component Analysis in High Dimension: Which Algorithm to Choose?
2017
Summary Principal component analysis (PCA) is a method of choice for dimension reduction. In the current context of data explosion, online techniques that do not require storing all data in memory are indispensable to perform the PCA of streaming data and/or massive data. Despite the wide availability of recursive algorithms that can efficiently update the PCA when new data are observed, the literature offers little guidance on how to select a suitable algorithm for a given application. This paper reviews the main approaches to online PCA, namely, perturbation techniques, incremental methods and stochastic optimisation, and compares the most widely employed techniques in terms statistical a…
Chemical and physical modification of hemp fibres by steam explosion technology
2013
In current research attempt has been made to analyse hemp fibres treated with steam explosion (SE) technology. Disintegration of hemp fibres separated from non-retted, dew-retted and dried stems of hemp ('Purini')[1] by alkali treatment and steam explosion (SE) were investigated. An average intensive SE in combination with the hydro-thermal and alkali after-treatment allows decreasing the diameter of hemp fibres and reduce the concentration of non-celluloses components, among them hemicelluloses, lignin, pectin, waxes and water [1;2].
Mesure et démesure en démographie. L'évolution de la population entre implosion et explosion
2015
International audience
Simulation numérique de la propagation d'une onde de choc issue d'une explosion en champ libre et son interaction avec un modèle biomécanique humain
2017
International audience; Les chargements liés à l’explosion sont fréquents dans le domaine militaire avec des conséquences plus ou moins sévères sur les structures en interaction avec cette sollicitation. Dans le contexte de protection du combattant, la compréhension de ce phénomène physique est important dans l’élaboration de systèmes de protection et pour prévenir les traumatismes liés aux chargements du "blast primaire". Dans ce contexte, ce papier décrit l’étude numérique d’une onde de souffle et son interaction avec un modèle biomécanique du corps humain, en utilisant les notions de similitudes
Digital Risks. Case Study on Digitization Projects of the LBUS Library
2019
Abstract Digital technologies changed all the social life domains in society, as we are now living in the digital era, in the information society or in an interconnected world. Besides the improvements in every day life, digital changes also brought inherent risks, from cyber-security, hacking, cyber-bullying, to the vulnerability of personal data, or the mental health consequences of information explosion. This article reviews the risks of the changes brought by the digital transformation on libraries in general, with examples of the LBUS Library, drawing from the last 10 years of development experience of informatic book management systems (electronic catalogue) and of the digital library…
Demo 5. Choques y explosiones sobre un carril
2013
Objetivo: Demostrar la conservación del momento lineal en choques (elásticos e inelásticos) y explosiones, para distintos valores de la masa de los cuerpos involucrados.
Ultraviolet camera measurements of passive and explosive (Strombolian) sulphur dioxide emissions at Yasur volcano, Vanuatu
2020
Here, we present the first ultraviolet (UV) camera measurements of sulphur dioxide (SO2) flux from Yasur volcano, Vanuatu, for the period 6–9 July 2018. These data yield the first direct gas-measurement-derived calculations of explosion gas masses at Yasur. Yasur typically exhibits persistent passive gas release interspersed with frequent Strombolian explosions. We used compact forms of the “PiCam” Raspberry Pi UV camera system [1,2] powered through solar panels to collect images. Our daily median SO2 fluxes ranged from 4 to 5.1 kg s−1, with a measurement uncertainty of −12.2% to +14.7%, including errors from the gas cell calibration drift, uncertainties in plume direction and distance, and…
Passive vs. active degassing modes at an open-vent volcano (Stromboli, Italy)
2012
Abstract We report here on a UV-camera based field experiment performed on Stromboli volcano during 7 days in 2010 and 2011, aimed at obtaining the very first simultaneous assessment of all the different forms (passive and active) of SO 2 release from an open-vent volcano. Using the unprecedented spatial and temporal resolution of the UV camera, we obtained a 0.8 Hz record of the total SO 2 flux from Stromboli over a timeframe of ∼14 h, which ranged between 0.4 and 1.9 kg s −1 around a mean value of 0.7 kg s −1 and we concurrently derived SO 2 masses for more than 130 Strombolian explosions and 50 gas puffs. From this, we show erupted SO 2 masses have a variability of up to one order of mag…
Burned to the Bone
2017
A burn-related injury that had worsened over time was compatible upon radioclinical examination with severe psoriatic arthritis (PsA), but was missing several essential characteristics of that disorder. A 58-year-old woman with no personal or family history of rheumatic diseases consulted for hand arthralgia. Her medical history was marked by severe burns to 80% of her body, sparing the face and the back, following a gas explosion 20 years earlier. …
Sprādzienbīstamās vides risks gāzes krātuvē
2022
“Sprādzienbīstamās vides risks gāzes krātuvē”. Darba autors: Andreass Petkuns, darba vadītājs: Dr.ķīm., docents Ingars Reinholds. Darbs izpildīts uz 51 lpp., darbs ietver 3 tabulas, 25 attēlus, 2 pielikumus 16 informatīvos avotus. Kvalifikācijas darba pētījums tika veikts A/S „Conexus Baltic Grid” Inčukalna pazemes gāzes krātuvē par sprādzienbīstamības vides risku. Pētījums sastāv no 4 daļām. Pirmajā daļā tika apkopota un analizēta literatūra par gāzes krātuves darbību un tehnoloģiskajiem procesiem, potenciāli sprādzienbīstamo vielu avotiem. Analizētā literatūra norāda uz sprādzienbīstamības riska esamību pētītajā objektā. Otrajā daļā tika izvēlētas piemērotas pētījuma metodes, ar kuru palī…