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Literatura científica selecionada sobre o tema "Transients events"

Autor: Grafiati

Publicado: 8 de fevereiro de 2025

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Artigos de revistas sobre o assunto "Transients events"

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Li, Yaqiong, Emily Biermann, Sigurd Naess, Simone Aiola, Rui An, Nicholas Battaglia, Tanay Bhandarkar et al. "The Atacama Cosmology Telescope: Systematic Transient Search of 3 Day Maps". Astrophysical Journal 956, n.º 1 (1 de outubro de 2023): 36. http://dx.doi.org/10.3847/1538-4357/ace599.

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Abstract We conduct a systematic search for transients in 3 yr of data (2017–2019) from the Atacama Cosmology Telescope (ACT). ACT covers 40% of the sky at three bands spanning from 77–277 GHz. Analysis of 3 day mean-subtracted sky maps, which were match filtered for point sources, yielded 29 transient detections. Eight of these transients are due to known asteroids, and three others were previously published. Four of these events occur in areas with poor noise models and thus we cannot be confident they are real transients. We are left with 14 new transient events occurring at 11 unique locations. All of these events are associated with either rotationally variable stars or cool stars. Ten events have flat or falling spectra indicating radiation from synchrotron emission. One event has a rising spectrum indicating a different engine for the flare.

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Ngeow, Chow-Choong, Nick Konidaris, Robert Quimby, Andreas Ritter, Alexander R. Rudy, Edward Lin e Sagi Ben-Ami. "The SED Machine: A Spectrograph to Efficiently Classify Transient Events Discovered by PTF". Proceedings of the International Astronomical Union 8, S290 (agosto de 2012): 281–82. http://dx.doi.org/10.1017/s1743921312020017.

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AbstractThe Palomar Transient Factory (PTF) is a project aimed to discover transients in the Universe, including Type Ia supernovae, core-collapse supernovae, and other exotic and rare transient events. PTF utilizes the Palomar 48-inch Telescope (P48) for discovering the transients, and follow-up mainly by the Palomar 60-inch Telescope (P60, for photometric light and color curves), as well as other telescopes. The discovery rate of PTF is about 7000 candidate transients per year, but currently only about 10% of the candidates are being followed-up and classified. To overcome this shortcoming, a dedicated spectrograph, called the SED Machine, is being designed and built at the California Institute of Technology for the P60 Telescope, aiming to maximize the classification efficiency of transients discovered by PTF. The SED Machine is a low resolution (R ~ 100) IFU spectrograph. It consists of a rainbow camera for spectrophotometric calibration, and a lenslet array plus 3-prism optics system for integrated field spectra. An overview of the science and design of the SED Machine is presented here.

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Sinha, Pampa, Sudipta Debath e Swapan Kumar Goswami. "Classification of Power Quality Events Using Wavelet Analysis and Probabilistic Neural Network". IAES International Journal of Artificial Intelligence (IJ-AI) 5, n.º 1 (20 de agosto de 2016): 1. http://dx.doi.org/10.11591/ijai.v5.i1.pp1-12.

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<p>Power quality studies have become an important issue due to widespread use of sensitive electronic equipment in power system. The sources of power quality degradation must be investigated in order to improve the power quality. Switching transients in power systems is a concern in studies of equipment insulation coordination. In this paper a wavelet based neural network has been implemented to classify the transients due to capacitor switching, motor switching, faults, converter and transformer switching. The detail reactive powers for these five transients are determined and a model which uses the detail reactive power as the input to the Probabilistic neural network (PNN) is set up to classify the above mentioned transients. The simulation has been executed for an 11kv distribution system. With the help of neural network classifier, the transient signals are effectively classified.</p>

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Qin, Yu-Jing, Ann Zabludoff, Marina Kisley, Yuantian Liu, Iair Arcavi, Kobus Barnard, Peter Behroozi, K. Decker French, Curtis McCully e Nirav Merchant. "Linking Extragalactic Transients and Their Host Galaxy Properties: Transient Sample, Multiwavelength Host Identification, and Database Construction". Astrophysical Journal Supplement Series 259, n.º 1 (24 de fevereiro de 2022): 13. http://dx.doi.org/10.3847/1538-4365/ac2fa1.

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Abstract Understanding the preferences of transient types for host galaxies with certain characteristics is key to studies of transient physics and galaxy evolution, as well as to transient identification and classification in the LSST era. Here we describe a value-added database of extragalactic transients—supernovae, tidal disruption events, gamma-ray bursts, and other rare events—and their host galaxy properties. Based on reported coordinates, redshifts, and host galaxies (if known) of events, we cross-identify their host galaxies or most likely host candidates in various value-added or survey catalogs, and compile the existing photometric, spectroscopic, and derived physical properties of the host galaxies in these catalogs. This new database covers photometric measurements from the far-ultraviolet to mid-infrared. Spectroscopic measurements and derived physical properties are also available for a smaller subset of hosts. For our 36,333 unique events, we have cross-identified 13,753 host galaxies using host names, plus 4480 using host coordinates. Besides those with known hosts, there are 18,100 transients with newly identified host candidates. This large database will allow explorations of the connections of transients to their hosts, including a path toward transient alert filtering and probabilistic classification based on host properties.

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Duza, Tasmia, e Ingrid H. Sarelius. "Localized transient increases in endothelial cell Ca2+ in arterioles in situ: implications for coordination of vascular function". American Journal of Physiology-Heart and Circulatory Physiology 286, n.º 6 (junho de 2004): H2322—H2331. http://dx.doi.org/10.1152/ajpheart.00006.2004.

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Intracellular Ca2+ transients were identified in endothelial cells (ECs) in intact blood-perfused arterioles. ECs in cremaster muscle arterioles (diameter ∼45 μm) in anesthetized mice were loaded with the Ca2+ indicator fluo 4-AM by intraluminal perfusion, after which blood flow was reestablished. Confocal microscopy was used to visualize Ca2+ as a function of fluo-4 intensity in real time. Separate sets of experiments were performed under the following conditions: control, ischemia, during inhibition of P2x or P1 purinoreceptors, and with the application of exogenous adenosine. In controls, spontaneous EC Ca2+ transients displayed a wide range of activity frequency (1–32 events/min) and about one-third of these transient events were synchronized between adjacent ECs. The increase in Ca2+ remained localized and did not spread to encompass the entire cell body. Ca2+ transient activity decreased significantly with ischemia (from 9.9 ± 0.6 to 3.1 ± 0.3 events/min, n = 135) but was unaffected by P2x or P1 receptor inhibition. Exogenous adenosine significantly increased the frequency of Ca2+ transients (to 12.8 ± 0.9 events/min) and increased synchronization so that 50% of all Ca2+ events were synchronized between ECs. This response to adenosine was not due to an increase in shear stress. These data indicate that localized Ca2+ transients are sensitive to flow conditions and, separately, to metabolically active pathways (exogenous adenosine), although the basal activity occurs independently of P2x or P1 receptors. These transients may represent a mechanism by which individual EC responses are integrated to result in coordinated arteriolar responses in situ.

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Whitfield, Paul H., e Kathleen Dohan. "Identification and characterization of water quality transients using wavelet analysis. II. Application to electronic water quality data". Water Science and Technology 36, n.º 5 (1 de setembro de 1997): 337–48. http://dx.doi.org/10.2166/wst.1997.0232.

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Two wavelet transform techniques for identifying water quality transients are applied to example data sets from two small streams. Temperature and conductance represent the range of properties from periodic processes to transient events. Both methods were successful in identifying the location, duration and magnitude of the transient events in these data sets. The methods may be refined to automate the detection and classification of transient events.

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Klimov, Pavel, Gali Garipov, Boris Khrenov, Violetta Morozenko, Vera Barinova, Vitaly Bogomolov, Margarita Kaznacheeva, Mikhail Panasyuk, Kirill Saleev e Sergey Svertilov. "Vernov Satellite Data of Transient Atmospheric Events". Journal of Applied Meteorology and Climatology 56, n.º 8 (agosto de 2017): 2189–201. http://dx.doi.org/10.1175/jamc-d-16-0309.1.

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AbstractData on transient atmospheric events (TAEs) were obtained from the Vernov satellite and are presented in this paper. The data are considered in conjunction with previous data obtained by the Universitetsky-Tatiana-1 and Universitetsky-Tatiana-2 satellites. The larger volume of stored scientific data in the Vernov mission and its advanced ultraviolet (UV) and red–infrared (R–IR) radiation detector (DUV) measurements allowed improved TAE-distribution data to be obtained over a wide range of photon numbers. The difference between features of luminous transients and “dim” transients, measured by the Universitetsky-Tatiana-2 satellite, is confirmed by Vernov’s data. There are also interesting dim UV events with no R–IR radiation. Such events are expected to be deep in the atmosphere at the level of thunderstorm clouds. They might be radiated by electric discharges of less power than lightning; in fact, at the preliminary stage of lightning. The observation of repeating dim TAEs in various time intervals, starting from tens of milliseconds and up to minutes, indicates that thunderstorm electric activity is much more variable than pure lightning strikes.

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Anderson, G. E., B. W. Stappers, I. Andreoni, M. Caleb, D. Coppejans, S. Corbel, R. P. Fender et al. "Radio Transients in the Era of Multi-Messenger Astrophysics". Proceedings of the International Astronomical Union 14, S339 (novembro de 2017): 207–14. http://dx.doi.org/10.1017/s1743921318002624.

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AbstractRadio emission from astrophysical transients allows us to derive calorimetry of kinetic feedback and detailed imaging in ways that are not possible at other wavelengths, and as such it forms an important part of the multi-messenger follow-ups of these events. The field is burgeoning, with a renaissance of interest in accretion, stellar explosions and jetted supernovæ, alongside newer classes of phenomena such as fast radio bursts and tidal disruption events. The purpose of this workshop was to discuss the infrastructure and techniques for detecting, identifying and probing radio transients, with a particular focus on how best to exploit transient alerts from multi-messenger facilities. We examined the type of transient alerts those facilities will broadcast, and methods for following them up, such as rapid-response triggering and shadowing. In break-out groups, participants chose a science question related to a particular radio transient type or class and discussed whether the planned transient strategies and observing techniques on the Square Kilometre Array will be adequate to address the particular question. The classes they chose included fast radio bursts, supernovæ, cataclysmic variable and unknown transients. Any proposed adaptation or suggestion was relayed to a panel of experts for further discussion. The second part of the workshop concentrated on the application of long baseline interferometry for detecting and measuring radio transients.

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Yillia, P. T., N. Kreuzinger e K. K. Mwetu. "Temporal variability of two contrasting transient pollution events in a pastoral stream". Water Science and Technology 61, n.º 4 (1 de fevereiro de 2010): 1053–63. http://dx.doi.org/10.2166/wst.2010.566.

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Two transient pollution events were monitored in a pastoral stream in southwestern Kenya to evaluate their relative contribution to diffuse pollution. Peak loads of pollutants during storm-induced transients were within 3–4 orders of magnitude higher than the short-lived (30–60 minutes) diurnal episodes provoked by in-stream activities of people and livestock. Transient yields were striking during storm-induced events; 778,000, 8,400, 550 and 100 kg day−1 for suspended solids, BOD5, total P and total N, respectively, compared to wet weather base flow (150, 30, 0.8 and 1.4 kg day−1, for the same parameters, respectively). Two forms of concentration-discharge relationships were observed: increases in concentration for turbidity, suspended solids, BOD5, total P and the faecal indicator bacteria at the peak of the stream hydrograph, and concurrent decreases in concentration for conductivity and total N. Following each storm-induced transient event, a marked improvement in water quality was observed within 48–72 hrs of the receding limb of the stream hydrograph before the next base low was established. It was concluded that storm-induced transients are exceedingly important for the mobilization of pollutants from diffuse sources but both transient events affect stream-channel processes, especially water quality, with the possibility of attendant consequences on the health of riparian inhabitants.

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Tucker, M. A., B. J. Shappee, M. E. Huber, A. V. Payne, A. Do, J. T. Hinkle, T. de Jaeger et al. "The Spectroscopic Classification of Astronomical Transients (SCAT) Survey: Overview, Pipeline Description, Initial Results, and Future Plans". Publications of the Astronomical Society of the Pacific 134, n.º 1042 (1 de dezembro de 2022): 124502. http://dx.doi.org/10.1088/1538-3873/aca719.

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Abstract We present the Spectroscopic Classification of Astronomical Transients (SCAT) survey, which is dedicated to spectrophotometric observations of transient objects such as supernovae and tidal disruption events. SCAT uses the SuperNova Integral-Field Spectrograph (SNIFS) on the University of Hawai’i 2.2 m (UH2.2m) telescope. SNIFS was designed specifically for accurate transient spectrophotometry, including absolute flux calibration and host-galaxy removal. We describe the data reduction and calibration pipeline including spectral extraction, telluric correction, atmospheric characterization, nightly photometricity, and spectrophotometric precision. We achieve ≲5% spectrophotometry across the full optical wavelength range (3500–9000 Å) under photometric conditions. The inclusion of photometry from the SNIFS multi-filter mosaic imager allows for decent spectrophotometric calibration (10%–20%) even under unfavorable weather/atmospheric conditions. SCAT obtained ≈640 spectra of transients over the first 3 yr of operations, including supernovae of all types, active galactic nuclei, cataclysmic variables, and rare transients such as superluminous supernovae and tidal disruption events. These observations will provide the community with benchmark spectrophotometry to constrain the next generation of hydrodynamic and radiative transfer models.

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Teses / dissertações sobre o assunto "Transients events"

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Owsley, Lane M. D. "Classification of transient events in time series /". Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5989.

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Santos, Rui Pedro Silvestre dos. "Time series morphological analysis applied to biomedical signals events detection". Master's thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/10227.

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Dissertation submitted in the fufillment of the requirements for the Degree of Master in Biomedical Engineering
Automated techniques for biosignal data acquisition and analysis have become increasingly powerful, particularly at the Biomedical Engineering research field. Nevertheless, it is verified the need to improve tools for signal pattern recognition and classification systems, in which the detection of specific events and the automatic signal segmentation are preliminary processing steps. The present dissertation introduces a signal-independent algorithm, which detects significant events in a biosignal. From a time series morphological analysis, the algorithm computes the instants when the most significant standard deviation discontinuities occur, segmenting the signal. An iterative optimization step is then applied. This assures that a minimal error is achieved when modeling these segments with polynomial regressions. The adjustment of a scale factor gives different detail levels of events detection. An accurate and objective algorithm performance evaluation procedure was designed. When applied on a set of synthetic signals, with known and quantitatively predefined events, an overall mean error of 20 samples between the detected and the actual events showed the high accuracy of the proposed algorithm. Its ability to perform the detection of signal activation onsets and transient waveshapes was also assessed, resulting in higher reliability than signal-specific standard methods. Some case studies, with signal processing requirements for which the developed algorithm can be suitably applied, were approached. The algorithm implementation in real-time, as part of an application developed during this research work, is also reported. The proposed algorithm detects significant signal events with accuracy and significant noise immunity. Its versatile design allows the application in different signals without previous knowledge on their statistical properties or specific preprocessing steps. It also brings added objectivity when compared with the exhaustive and time-consuming examiner analysis. The tool introduced in this dissertation represents a relevant contribution in events detection, a particularly important issue within the wide digital biosignal processing research field.

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Deshpande, Kshitija Bharat. "A Dedicated Search for Low Frequency Radio Transient Astrophysical Events using ETA". Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35666.

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Astrophysical phenomena such as self-annihilation of primordial black holes (PBHs), gamma ray bursts (GRBs), and supernovae are expected to produce single dispersed pulses detectable in the low end of the radio spectrum. Analysis of these pulses could provide valuable information about the sources, and the surrounding and intervening medium. The Eight-meter-wavelength Transient Array (ETA) is a radio telescope dedicated to the search for these pulses in an 18 MHz bandwidth centered at 38 MHz. ETA consists of 10 dual-polarized active dipoles providing an all-sky field of view. This thesis describes the results of a search campaign using ETA, namely, a Crab giant pulse (CGP) search. CGPs are already known to exist, and thus provide an excellent diagnostic for system performance. We found 11 CGP candidates in 14 hours of data. Although there has not been a single compelling detection (signal-to-noise ratio > 6), our analysis shows that at least a few of these candidates may be CGPs. We also explain the analysis preparation for PBH and GRB searches. Additionally, we describe the instrument and a software "toolchain" developed for the analysis of data that includes calibration, radio frequency interference (RFI) mitigation, and incoherent dedispersion. A dispersed pulse simulation code was developed and used to test the toolchain. Finally, improvements are suggested.
Master of Science

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Allgood, Michael David Baginski Michael E. "Finite element analysis of the mesosphere's electromagnetic response to large scale lightning associated with sprites and other transient luminous events". Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Electrical_and_Computer_Engineering/Thesis/Allgood_Michael_37.pdf.

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Hoeker, Gregory Scott. "MECHANISMS OF CALCIUM-MEDIATED ARRHYTHMOGENESIS IN HEART FAILURE". Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1195243457.

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Hidalga, García-Bermejo Patricio. "Development and validation of a multi-scale and multi-physics methodology for the safety analysis of fast transients in Light Water Reactors". Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/160135.

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[ES] La tecnología nuclear para el uso civil genera más preocupación por la seguridad que muchas otras tecnologías que se usan a diario. La Autoridad Nuclear define las bases de cómo debe realizarse la operación segura de una Central Nuclear. De acuerdo a las directrices establecidas por la Autoridad Nuclear, una Central Nuclear debe analizar una envolvente de escenarios hipotéticos y comprobar de manera determinista que los criterios de aceptación para dicho evento se cumplen. El Análisis Determinista de Seguridad utiliza herramientas de simulación que aplican la física conocida sobre el comportamiento de la Central Nuclear para evaluar la evolución de una variable de seguridad y asegurar que los límites no se sobrepasan. El desarrollo de la tecnología informática, de los métodos matemáticos y de la física que envuelve el comportamiento de una Central Nuclear han proporcionado herra-mientas de simulación potentes que son capaces de predecir el comportamiento de las variables de seguridad con una importante precisión. Esto permite analizar escenarios de manera más realista evitando asumir condiciones conservadoras que hasta la fecha compensaban la falta de conocimiento modelado en las herramientas de simulación. Las herramientas conocidas como De Mejor Estimación son capaces de analizar even-tos transitorios en diferentes escalas. Además, emplean modelos analíticos de las dife-rentes físicas más detallados, así como correlaciones experimentales más realistas y actuales. Un paso adelante en el Análisis Determinista de Seguridad pretende combinar las diferentes herramientas de Mejor Estimación que se emplean para analizar las dis-tintas físicas de una Central Nuclear, considerando incluso la interacción entre ellas y el análisis progresivo a diferentes escalas, llegando a analizar fenómenos más locales si es necesario. Para este fin, esta tesis presenta una metodología de análisis multi-físico y multi-escala que emplea diferentes códigos de simulación analizando el escenario propuesto a dife-rentes escalas, es decir, desde un nivel de planta que incluye los distintos componentes, hasta el volumen de control que supone el refrigerante pasando entre las varillas de combustible. Esta metodología permite un flujo de información que va desde el análi-sis a mayor escala hasta el de menor escala. El desarrollo de esta metodología ha sido validado con datos de planta para poder evaluar el alcance de esta metodología y pro-porcionar nuevas líneas de trabajo futuro. Además, se han añadido los resultados de los distintos procesos de validación y verificación que han surgido a lo largo de este trabajo.
[CA] La tecnologia nuclear per a l'ús civil genera més preocupació per la seguretat que moltes altres tecnologies d'ús quotidià. L'Autoritat Nuclear defineix les bases de com ha de realitzar-se l'operació segura d'una Central Nuclear. D'acord amb les directrius establertes per l'Autoritat Nuclear, una Central Nuclear ha d'analitzar una envoltant d'escenaris hipotètics I comprovar de manera determinista que els criteris d'acceptació per a l'esdeveniment seleccionat es compleixen. L'Anàlisi Determinista de Seguretat utilitza eines de simulació que apliquen la física coneguda sobre el comportament de la Central Nuclear per avaluar l'evolució d'una variable de seguretat i assegurar que els límits no es traspassen. El desenvolupament de la tecnologia informàtica, els mètodes matemàtics i de la física que envolta el comportament d'una Central Nuclear han proporcionat eines de simulació potents amb capacitat de predir el comportament de les variables de seguretat amb una precisió significativa. Això permet analitzar escenaris de manera realista evitant assumir condicions conservadores que fins al moment compensaven la mancança de coneixement. Les eines de simulació conegudes com De Millor Estimació son capaces d'analitzar esdeveniment transitoris a diferent escales. A més, utilitzen models analítics per a les diferents físiques amb més detall així com correlacions experimentals més actualitzades i realistes. Un pas més endavant en l'Anàlisi Determinista de Seguretat pretén combinar les diferents eines de Millor Estimació que se utilitzen per analitzar les distintes físiques d'una Central Nuclear, considerant inclús la interacció entre ells i l'anàlisi progressiu a diferents escales, amb la finalitat de poder analitzar fenòmens locals. Per a aquest fi, esta tesi presenta una metodologia d'anàlisi multi-física i multi-escala que utilitza diferents codis de simulació analitzant l'escenari proposat a diferents escales, és a dir, des d'un nivell de planta que inclou els distints components, fins al volum de control que suposa el refrigerant passant entre les varetes de combustible. Esta metodologia permet un flux de informació que va des de l'anàlisi d'una escala major a una menor. El desenvolupament d'aquesta metodologia ha sigut validada i verificada amb dades de planta i els resultats han sigut analitzats a fi d'avaluar la capacitat de la metodologia i les possibles línies de treball futur. A més s'han afegit els principals resultats de verificació i validació que han sorgit en les distintes etapes d'aquest treball.
[EN] The nuclear technology for civil use has generated more concerns for the safety than several other technologies applied to the daily life. The Nuclear Regulators define the basis of how the Safety Operation of Nuclear Power Plants is to be done. According to these guidelines, a Nuclear Power Plant must analyze an envelope of hypothetical events and deterministically define if the acceptance criteria for these events is met. The Deterministic Safety Analysis uses simulation tools that apply the physics known in the behavior of the Nuclear Power Plant to evaluate the evolution of a safety varia-ble and assure that the safety limits will not be exceeded. The development of the computer science, the numerical methods and the physics involved in the behavior of a Nuclear Power Plant have yield powerful simulation tools that are capable to predict the evolution of safety variables which significant accuracy. This allows to consider more realistic simulation scenarios instead of con-servative approaches in order to compensate the lack of knowledge in the applied prediction methods. The so called Best Estimate simulation tools are capable to analyze the transient events in different scales. Furthermore, they account more detailed analytical models and experimental correlations. A step forward in the Deterministic Safety Analysis intends to combine the Best Estimate simulation tools of the different physics considering the interaction among them and analyzing the different scales, considering more local approaches if necessary. For this purpose, this thesis work presents a multi-scale and multi-physics methodology that uses different physics codes and has the aim of modeling postulated scenarios in different scales, i.e. from system models representing the components of the plants to the subchannel models that analyze the behavior of the coolant between the fuel rods. This methodology allows a flow of information where the output of one scale is used as input in a more detailed scale to predict a more local analysis of parameters, such as the Critical Power Ratio, which are of great importance for the estimation of safety margins. The development of this methodology has been validated against plant data with the aim of evaluating the scope of this methodology and in order to provide future lines of development. In addition, different results of the validation and verifi-cation yielded in the development of the parts of this methodology are presented.
Hidalga García-Bermejo, P. (2020). Development and validation of a multi-scale and multi-physics methodology for the safety analysis of fast transients in Light Water Reactors [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/160135
TESIS

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Westlund, Kenneth P. (Kenneth Peter). "Recording and processing data from transient events". Thesis, Massachusetts Institute of Technology, 1988. https://hdl.handle.net/1721.1/129961.

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Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.
Includes bibliographical references.
by Kenneth P. Westlund Jr.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1988.

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8

Boyd, Alistair Richard. "Fluid-structure interaction under fast transient dynamic events". Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/10835.

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Underwater explosive loading resulting from rapid phase transitions (RPT's) is one example of a fast transient dynamic event. The leakage of substances such as LPG or LNG when stored underwater can cause an RPT. These substances are often stored in a combination of very low temperatures and high pressures with respect to the surrounding fluid (seawater) and their leakage can cause the equivalent of an underwater explosion. Such containers are usually found to be part of a much larger 'storage field' of containers. An RPT occurring in one container will cause underwater explosive loading on neighbouring containers. By simulating an RPT using explosive charges experiments were initially designed using theoretical and empirical techniques. The fluid and structural response of a prototype container subject to symmetric and axisymmetric underwater explosive (UNDEX) loading was then examined experimentally. Theoretical predictions using the finite element hydrocode LS-DYNA and boundary element code USA-DYNA3D were undertaken and compared with experimental observations. Several non-destructive techniques were employed to estimate dynamic collapse buckling criteria from both experimental and theoretical results. The experimental work concluded that the critical regions of the prototype container were the apex and the base under both forms of loading. The quality of the numerical predictions varied dependent on the form of the loading. In some cases the fluid and structural responses were overpredicted, and in others underpredicted. Within the limitations of these numerical procedures it was possible to predict a conservative estimate of a critical charge size under axisymmetric UNDEX loading using LS-DYNA. The critical stand off distance was also estimated from experimental results under symmetric UNDEX loading. The use of numerical approaches to predict fluid-structure interaction as successful for the shock phase of an underwater loading and both LS-DYNA and USA-DYnA3D have been validated for shock loading. Bubble loading simulations proved unsuccessful. Suggested improvements are proposed to increase the application of, and enhance the reliability of, the techniques used in this work.

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Dusek, Daniel P. "Ocean mixed layer biological response to transient ocean events". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA340990.

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Thesis (M.S. in Physical Oceanography) Naval Postgraduate School, September 1997.
"September 1997." Thesis advisor(s): Roland W. Garwood. Includes bibliographical references (p. 61-63). Also available online.

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Price, Daniel James. "Forward modelling of transient events in the solar atmosphere". Thesis, Aberystwyth University, 2017. http://hdl.handle.net/2160/50cf4525-e93c-4c15-9c63-c5ed7daba471.

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The solar atmosphere is a highly magnetised plasma covering a wide range of temperatures from the thousands of Kelvin to the millions. How exactly it reaches such extreme temperatures remains unknown. There are however numerous events that take place, concerned with the movement of energy and plasma throughout the solar atmosphere. This thesis makes use of four instruments that have studied the Sun in the past, and in three cases continue to do so today. Observations from these instruments are combined with synthetic observations obtained from a detailed non-equilibrium ionisation hydrodynamic radiation code to understand the nature of what was observed and deduce physical information. One study presents the replication of light curves of a loop obtained by the Atmospheric Imaging Assembly (AIA). It finds that it was a cold loop heated by a pulse of energy at its footpoint consistent with the energy of a nano are. Another study replicates line proles of a structure observed by the Extreme-Ultraviolet Imaging Spectrometer (EIS) within an outflow region. We find that it is best modelled by a long loop consisting of at least 100 strands undergoing a cyclical process of heating and cooling on timescales of approximately 80 minutes. A final study replicates line profiles from the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) instrument, and uses images from the Transition Region and Coronal Explorer (TRACE) to add context to the interpretation.

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Livros sobre o assunto "Transients events"

1

Dusek, Daniel P. Ocean mixed layer biological response to transient ocean events. Monterey, Calif: Naval Postgraduate School, 1997.

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2

Ribeiro, Deivid. Observations of Transient Events with Very-High-Energy Gamma-Ray Telescopes. [New York, N.Y.?]: [publisher not identified], 2022.

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3

Osborne, William Dale. NPSNET: An accurate low-cost technique for real-time display of transient events : vehicle collisions, explosions and terrain modifications. Monterey, Calif: Naval Postgraduate School, 1991.

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D, Bechtel R., e Ames Research Center, eds. A fast data acquisition system for the study of transient events by high repetition rate time-of-flight mass spectrometry. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1987.

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5

Oesterreich, Mark H. Transient response analysis of the 72 Inch TAC-4 ruggedized shipboard rack subjected to an underwater explosion event. Monterey, Calif: Naval Postgraduate School, 1998.

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6

G, Choi, Iyer Ravishankar K e United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Analog-digital simulation of transient-induced logic errors and upset susceptibility of an advanced control system. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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7

G, Choi, Iyer Ravishankar K e United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Analog-digital simulation of transient-induced logic errors and upset susceptibility of an advanced control system. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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8

G, Choi, Iyer R. K e United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Analog-digital simulation of transient-induced logic errors and upset susceptibility of an advanced control system. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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Carreno, Victor A. Analog-digital simulation of transient-induced logic errors and upset susceptibility of an advanced control system. Hampton, Va: Langley Research Center, 1990.

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10

Sawaya-Lacoste, Huguette. Proceedings of SOHO-13: Waves, oscillations and small-scale transient events in the solar atmosphere : a joint view from SOHO and TRACE, 29 September - 3 October 2003, Palma de Mallorca, Balearic Islands, Spain. Noordwijk, the Netherlands: ESA Publication Division, 2004.

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Capítulos de livros sobre o assunto "Transients events"

1

Webb, David, e Nariaki Nitta. "Understanding Problem Forecasts of ISEST Campaign Flare-CME Events". In Earth-affecting Solar Transients, 703–27. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1570-4_34.

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Aslam, O. P. M., e Badruddin. "Study of the Geoeffectiveness and Galactic Cosmic-Ray Response of VarSITI-ISEST Campaign Events in Solar Cycle 24". In Earth-affecting Solar Transients, 347–63. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1570-4_16.

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Bocchialini, K., B. Grison, M. Menvielle, A. Chambodut, N. Cornilleau-Wehrlin, D. Fontaine, A. Marchaudon et al. "Statistical Analysis of Solar Events Associated with Storm Sudden Commencements over One Year of Solar Maximum During Cycle 23: Propagation from the Sun to the Earth and Effects". In Earth-affecting Solar Transients, 377–438. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-024-1570-4_18.

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Zhao, Zixiang, Zhongdi Duan, Hongxiang Xue, Yuchao Yuan e Shiwen Liu. "Effects of Inlet Conditions on the Two-Phase Flow Water Hammer Transients in Elastic Tube". In Springer Proceedings in Physics, 955–72. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_81.

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AbstractTwo-phase flow water hammer events occur in the pipelines of the nuclear power systems and lead to transient and violent pressure shock to tube structures. For the sake of operation safety, the occurrence and severity of the two-phase water hammer should be carefully assessed. This paper presents a parameter analysis of the inlet conditions on the two-phase flow water hammer transients, with considering the elastic effect of the tube walls. A numerical model is established for the vapor-liquid two-phase flow based on the two-fluid six-equation modelling approach, with incorporating correlations and criterions for two-phase flow regime, interfacial interactions and heat transfer. The governing equations are transformed to matrix form expressed by characteristic variables, and solved using the splitting operator method and the total variation diminishing scheme. The accuracy of the model is verified against the experimental data in open literature. Then, the model is applied to investigate the effect of inlet velocity and inlet water temperature on the two-phase flow water hammer transients. The simulation results show that the increase of inlet velocity increases the pressure peak values and brings forward the onset of water hammer, and the increase of inlet temperature decreases the pressure shock. A comparison of the water hammer results between the elastic tube and rigid tube is further presented, and the effect of the elastic modulus on the water hammer is analyzed. The results also show that the pressure peak is largely affected by the tube diameter.

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Nickolaenko, Alexander, e Masashi Hayakawa. "Transient Events". In Schumann Resonance for Tyros, 187–216. Tokyo: Springer Japan, 2013. http://dx.doi.org/10.1007/978-4-431-54358-9_9.

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Cooke, A. Christian, e B. Benjamin Mestel. "Simulating the Effects of Inertia and Frequency Response Services on Transient Propagation in a Networked Grid". In Springer Proceedings in Energy, 73–80. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30960-1_8.

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AbstractAs part of climate change mitigation efforts, there has been acceleration in the deployment of distributed renewable generation replacing conventional thermal power plants in grids across the world. As a result, there has been a change in the aggregate and regional inertial capacity, with consequences for the stability of these networks and their ability to withstand large variations in frequency. Building on previous work that successfully simulated frequency events on the GB grid using a single bus model, this paper describes a networked grid model using an algebraic differential system of equations. This is used to simulate the effects of localized variation in inertia and frequency response services on the propagation of transients across a network. Using this model, the effects of varying responses to transients can be investigated, and grids of varying scales and topologies can be compared to determine differences in their response to outages. The propagation of disturbances across domains within the network that have different frequency response characteristics can be examined with a view to drawing conclusions about the optimal deployment of frequency response services, and their relative cost-effectiveness in delivering a stable supply as the proportion of renewable generation in the energy mix grows.

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Digel, Ilya. "Primary Thermosensory Events in Cells". In Transient Receptor Potential Channels, 451–68. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-94-007-0265-3_25.

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Zoltani, Csaba K., e Kevin J. White. "Tomography of Transient Events". In Optical Methods in Dynamics of Fluids and Solids, 333–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82459-3_42.

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Damarla, Thyagaraju. "Localization of Transient Events". In Battlefield Acoustics, 145–75. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16036-8_9.

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Yamada, Lidia, Shelly Ozark e Bruce Ovbiagele. "Ischemic stroke and transient events, TIA". In International Neurology, 3–6. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118777329.ch2.

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Trabalhos de conferências sobre o assunto "Transients events"

1

Hadasch, Daniela. "Exploring the Universe's Extreme Events: Galactic Transients at High and Very High Energies". In 38th International Cosmic Ray Conference, 022. Trieste, Italy: Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.444.0022.

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Ezekoye, L. Ike, Thomas Beagen, Brian S. Gordon e John W. Boufford. "Long Term Operation of Safety Valves at Pressures Near the Set Pressure". In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-66040.

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Safety valves in nuclear power plants provide over pressure protection of pressurized systems. Accordingly, these valves are required to open quickly and stably (i.e., open, relieve pressure and close) during postulated transients to protect the integrity of the protected systems. Typically, postulated transients are classified as fast or slow. Fast transients have high system pressurization rates that proceed very quickly thereby requiring the safety valves to pop open. On the other hand, there are transients that proceed very slowly that are less challenging to the system but may initiate leakage across the installed safety valve seat. There is very limited knowledge on the impact of prolonged operation of safety valves during slow pressurization accident events. The integrity and functionality of these valves during such slow pressurization events are often in question. This paper examines analytically the behavior and the integrity of safety valves during slow pressurization transient events at pressures near the valve set pressure. This paper considers extended periods of valve simmering that may progress to valve cycling (popping fully open) during such events. To validate the analytical performance prediction, steam tests were performed with safety valves which confirmed that these valves can operate extensively under slow pressurization transient events while maintaining their capability to perform their intended design function.

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Marroquin, Amy, e Scott Lang. "Addressing Low Pressure Transients". In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21858.

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Abstract Low transient pressures in piping systems are different in many ways to high transient pressures. While high pressures can obviously burst pipes or damage components, low pressures can collapse pipes, pull in environmental contaminants, bring components out of solution, or induce transient cavitation, a particular concern for hydrocarbon liquids. This paper will use examples of computer modeling to reveal how common system events such as pump trips or valve closures induce low pressure transient waves that have potential to be just as destructive as more intuitive high pressure waves. Fluid transient studies and literature often focus on high pressures, or do not clearly demonstrate how liquids with low vapor pressures (such as many hydrocarbons) can be affected. Even discerning a pipe’s negative pressure rating through codes and standards can be a challenge. It is shown that low pressure transients are a potential issue in any liquid system. It is further demonstrated that “Rule of Thumb” or typical simplified calculations are not sufficient to capture these effects, and cannot be used to properly locate and size equipment.

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Lu, Kai, Jinya Katsuyama e Yinsheng Li. "Extension of PASCAL4 Code for Probabilistic Fracture Mechanics Analysis of Reactor Pressure Vessel in Boiling Water Reactor". In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21421.

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Abstract In Japan, Japan Atomic Energy Agency has developed a probabilistic fracture mechanics (PFM) analysis code, PASCAL4, for probabilistic evaluation of reactor pressure vessels (RPVs) in pressurized water reactors (PWRs) considering neutron irradiation embrittlement and pressurized thermal shock (PTS) events. Besides severe PTS events, however, transients associated with normal operations, such as the cooldown and heatup transients associated with reactor shutdown and startup, respectively, should also be considered in the integrity assessment of RPVs in both PWRs and boiling water reactors (BWRs). With regard to a heatup transient, because temperature is at its minimum, and tensile stress at its maximum on the RPV outer surface, outer surface crack and embedded crack near the RPV outer surface should be taken into account. To extend the applicability of PASCAL4, we improved the code to include analysis functions for these cracks. The improved PASCAL4 can be used to run PFM analyses of RPVs subjected to both cooldown (including PTS) and heatup transients. In this paper, improvements made to PASCAL4 are firstly described, including the incorporated stress intensity factor solutions and the corresponding calculation methods for vessel outer surface crack and embedded crack near the outer surface. Using the improved PASCAL4, PFM analysis examples for a Japanese BWR-type model RPV subjected to thermal transients including a low temperature overpressure event and a heatup transient are presented.

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Longley, John P. "Calculating Stall and Surge Transients". In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27378.

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Many aspects of the aerodynamic operation and the mechanical integrity of an aeroengine are determined by the stall and surge transients of the compression system. A, physically based, blockage-mixing method and a novel blockage-transport equation are presented that can be used to estimate blade row operation at severe off-design conditions. The blockage-mixing method is proposed based on an analysis of the large separations that are present within a blade passage during reverse-flow (negative axial velocity) conditions. A time accurate computational simulation has been developed, based on the blockage-mixing method, which solves for the moderate to long lengthscale compressible unsteady flowfield within a compression system. The flow through each blade row is resolved in the axial, circumferential and radial directions. Calculated stall and surge events are compared with experimental data and the ability to calculate an aeroengine transient is demonstrated. The simulation is presented as a computational tool for estimating the aerodynamic loads during compression system instability events.

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Miranda, Samuel. "Strategies to Prevent Benign Transients From Becoming Serious Accidents". In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60472.

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Nuclear safety criteria are based upon the concept that plant situations that are expected to have a high frequency of occurrence must not pose a danger to the public, and that plant situations that pose the greatest danger to the public must be limited to situations that have a very low expected frequency of occurrence. This concept is implemented by grouping plant situations (or events) into categories that are defined according to their expected frequencies of occurrence. It is important not to allow the boundaries of these categories to be crossed. Plant designs cannot allow low-consequence events of high expected frequency to develop into events of more serious, high-consequence categories. The development of this system of frequency-based categorization is discussed, followed by an evaluation of various methods that have been proposed and applied to show how minor events could be prevented from becoming major events.

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Agostinho, Mariele De Souza Parra Agostinho, Danieli Mara Ferreira e Cristovão Vicente Scapulatempo Fernandes. "Physical and water quality indicators assessment in main pipelines: The impact of hydraulic transient events". In 2nd WDSA/CCWI Joint Conference. València: Editorial Universitat Politècnica de València, 2022. http://dx.doi.org/10.4995/wdsa-ccwi2022.2022.14730.

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An indicator that correlates physical quantities with water quality has great relevance for the definition of projects and understanding of real hydraulic transient phenomena. The work proposing a method to estimate water quality in real system focusing on turbidity measurements during a transient, as surrogate to understand potential dynamics in real systems. In order to get an empirical formula to turbidity during hydraulic transients, was observed 5 years’ data from a real system. This system is one of the mains important pipelines of the Water Supply System of Curitiba and Metropolitan Region, in South Brazil.

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Orekhova, N. V., G. M. Beskin, A. V. Birykov, S. F. Bondar, E. A. Ivanov, S. V. Karpov, E. V. Katkova, A. V. Perkov, V. L. Plokhotnichenko e V. V. Sasyk. "Search and study of optical transients with Mini-MegaTORTORA". In The multi-messenger astronomy: gamma-ray bursts, search for electromagnetic counterparts to neutrino events and gravitational waves. Sneg, 2019. http://dx.doi.org/10.26119/sao.2019.1.35544.

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Robinson, L., R. Xu, M. Littlefair, A. Gallant e A. Horsfall. "Impact of turn off transients on MOSFET failure during short circuit events". In 11th International Conference on Power Electronics, Machines and Drives (PEMD 2022). Institution of Engineering and Technology, 2022. http://dx.doi.org/10.1049/icp.2022.1139.

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Moisseytsev, Anton, e James J. Sienicki. "Analysis of Thermal Transients for sCO2 Brayton Cycle Heat Exchangers". In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90374.

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Abstract The design of heat exchangers for use in a supercritical carbon dioxide (sCO2) Brayton cycle power converter must provide for acceptable performance for duty cycle events encompassing anticipated transients and postulated accidents. This paper presents the results of a comprehensive analysis of thermal transients for sCO2 cycle heat exchangers, with emphasis on the sodium-to-CO2 heat addition heat exchanger. A range of transients, from normal operation to severe accidents, were simulated with the coupled PDC and SAS4A/SASSYS-1 system level dynamic analysis computer codes. For each transient, the calculated change in the heat exchanger wall temperature is determined as a measure of the thermal loading.

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Relatórios de organizações sobre o assunto "Transients events"

1

Ahrens, D. M. Fast Flux Test Facility thermal and pressure transient events during Cycle 11. Office of Scientific and Technical Information (OSTI), março de 1992. http://dx.doi.org/10.2172/10197314.

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Wilson, D. K., V. A. Nguyen, Nassy Srour e John Noble. Sound Exposure Calculations for Transient Events and Other Improvements to an Acoustical Tactical Decision Aid. Fort Belvoir, VA: Defense Technical Information Center, agosto de 2002. http://dx.doi.org/10.21236/ada406703.

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Mackowiak, D. P., C. D. Gentillon e K. L. Smith. Development of transient initiating event frequencies for use in probabilistic risk assessments. Office of Scientific and Technical Information (OSTI), maio de 1985. http://dx.doi.org/10.2172/5573321.

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Boulghassoul, Y., L. W. Massengill, A. L. Sternberg, R. L. Pease, S. Buchner, J. W. Howard, D. McMorrow, M. W. Savage e C. Poivey. Circuit Modeling of the LM124 Operational Amplifier for Analog Single-Event Transient Analysis. Fort Belvoir, VA: Defense Technical Information Center, janeiro de 2002. http://dx.doi.org/10.21236/ada525692.

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Mueller, C. J. Uncertainties in inherent shutdown of generic unprotected loss-of-flow and transient overpower events in innovative designs. Office of Scientific and Technical Information (OSTI), outubro de 1987. http://dx.doi.org/10.2172/713938.

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Pong, L. Assessment of the combustion model in the HECTR (Hydrogen Event: Containment Transient Response) code. Office of Scientific and Technical Information (OSTI), novembro de 1990. http://dx.doi.org/10.2172/6396610.

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Froehle, P., A. Tentner e C. Wang. Modeling and analysis of transient vehicle underhood thermo - hydrodynamic events using computational fluid dynamics and high performance computing. Office of Scientific and Technical Information (OSTI), setembro de 2003. http://dx.doi.org/10.2172/834718.

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Roberts, J. S., S. L. Woosley, D. L. Lessor e C. Strachan. Preliminary investigation of the potential for transient vapor release events during in situ vitrification based on thermal- hydraulic modeling. Office of Scientific and Technical Information (OSTI), julho de 1992. http://dx.doi.org/10.2172/10166606.

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Roberts, J. S., S. L. Woosley, D. L. Lessor e C. Strachan. Preliminary investigation of the potential for transient vapor release events during in situ vitrification based on thermal- hydraulic modeling. Office of Scientific and Technical Information (OSTI), julho de 1992. http://dx.doi.org/10.2172/7310002.

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Aadithya, Karthik, Eric Keiter e Ting Mei. DAGSENS: Directed Acyclic Graph Based Direct and Adjoint Transient Sensitivity Analysis for Event-Driven Objective Functions. Office of Scientific and Technical Information (OSTI), agosto de 2017. http://dx.doi.org/10.2172/1761808.

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