Relevant bibliographies by topics / Modely front

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Modely front'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Modely front"

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Sinclair, Victoria A. "A 6-yr Climatology of Fronts Affecting Helsinki, Finland, and Their Boundary Layer Structure." Journal of Applied Meteorology and Climatology 52, no. 9 (September 2013): 2106–24. http://dx.doi.org/10.1175/jamc-d-12-0318.1.

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AbstractA 6-yr climatology of the frequency, characteristics, and boundary layer structure of synoptic-scale fronts in Helsinki, Finland, was created using significant weather charts and observations from a 327-m-tall mast and from the Station for Measuring Ecosystem–Atmosphere Relationships III. In total, 855 fronts (332 cold fronts, 236 warm fronts, and 287 occluded fronts) affected Helsinki during the 6-yr period, equating to one front every 2.6 days. Seasonal and diurnal cycles were observed, with frontal frequency peaking during the cold season and during daytime. Composites of warm and cold fronts were developed to provide observationally based conceptual models of the low-level structure of fronts at the end of the North Atlantic Ocean storm track. The composite warm front displays a temperature increase of 4.0°C; a broad, forward-tilting frontal zone; and prolonged, weak-to-moderate precipitation. The composite cold front is characterized by a temperature decrease of 4.4°C, a narrow and slightly rearward-tilting frontal zone, and moderate precipitation collocated with the surface front. Relationships between frontal characteristics and the direction from which fronts approached, the season, time of day, prefrontal boundary layer lapse rate, and the location of the wind shift relative to the thermal gradient were investigated. The prefrontal lapse rate was the single most important variable in determining the temperature change, the height of the maximum temperature change, and the near-surface tilt of both warm and cold fronts. This result demonstrates the interaction between boundary layer and synoptic-scale processes that must be captured by numerical weather prediction models to accurately forecast surface fronts.
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GLASNER, KARL. "Rapid growth and critical behaviour in phase field models of solidification." European Journal of Applied Mathematics 12, no. 1 (February 2001): 39–56. http://dx.doi.org/10.1017/s0956792501004351.

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Rapid solidification fronts are studied using a phase field model. Unlike slow moving solutions which approximate the Mullins–Sekerka free boundary problem, different limiting behaviour is obtained for rapidly moving fronts. A time-dependent analysis is carried out for various cases and the leading order behaviour of solidification front solutions is derived to be one of several travelling wave problems. An analysis of these problems is conducted, leading to expressions for front speeds in certain limits. The dynamics leading to these travelling wave solutions is derived, and conclusions about stability are drawn. Finally, a discussion is made of the relationship to other solidification models.
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Thomas, Carl M., and David M. Schultz. "What are the Best Thermodynamic Quantity and Function to Define a Front in Gridded Model Output?" Bulletin of the American Meteorological Society 100, no. 5 (May 2019): 873–95. http://dx.doi.org/10.1175/bams-d-18-0137.1.

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AbstractFronts can be computed from gridded datasets such as numerical model output and reanalyses, resulting in automated surface frontal charts and climatologies. Defining automated fronts requires quantities (e.g., potential temperature, equivalent potential temperature, wind shifts) and kinematic functions (e.g., gradient, thermal front parameter, and frontogenesis). Which are the most appropriate to use in different applications remains an open question. This question is investigated using two quantities (potential temperature and equivalent potential temperature) and three functions (magnitude of the horizontal gradient, thermal front parameter, and frontogenesis) from both the context of real-time surface analysis and climatologies from 38 years of reanalyses. The strengths of potential temperature to identify fronts are that it represents the thermal gradients and its direct association with the kinematics and dynamics of fronts. Although climatologies using potential temperature show features associated with extratropical cyclones in the storm tracks, climatologies using equivalent potential temperature include moisture gradients within air masses, most notably at low latitudes that are unrelated to the traditional definition of a front, but may be representative of a broader definition of an airmass boundary. These results help to explain previously published frontal climatologies featuring maxima of fronts in the subtropics and tropics. The best function depends upon the purpose of the analysis, but Petterssen frontogenesis is attractive, both for real-time analysis and long-term climatologies, in part because of its link to the kinematics and dynamics of fronts. Finally, this study challenges the conventional definition of a front as an airmass boundary and suggests that a new, dynamically based definition would be useful for some applications.
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Schultz, David M. "A Review of Cold Fronts with Prefrontal Troughs and Wind Shifts." Monthly Weather Review 133, no. 8 (August 1, 2005): 2449–72. http://dx.doi.org/10.1175/mwr2987.1.

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Abstract The conceptual model of a classical surface-based cold front consists of a sharp temperature decrease coincident with a pressure trough and a distinct wind shift at the surface. Many cold fronts, however, do not conform to this model—time series at a single surface station may possess a pressure trough and wind shift in the warm air preceding the cold front (hereafter called a prefrontal trough and prefrontal wind shift, respectively). Although many authors have recognized these prefrontal features previously, a review of the responsible mechanisms has not been performed to date. This paper presents such a review. Ten disparate mechanisms with different frontal structures have been identified from the previous literature. These mechanisms include those external to the front (i.e., those not directly associated with the cold front itself): synoptic-scale forcing, interaction with lee troughs/drylines, interaction with fronts in the mid- and upper troposphere, and frontogenesis associated with inhomogeneities in the prefrontal air. Mechanisms internal to the front (i.e., those directly associated with the structure and dynamics of the front) include the following: surface friction, frontogenesis acting on alongfront temperature gradients, moist processes, descent of air, ascent of air at the front, and generation of prefrontal bores/gravity waves. Given the gaps in our knowledge of the structure, evolution, and dynamics of surface cold fronts, this paper closes with an admonition for improving the links between theory, observations, and modeling to advance understanding and develop better conceptual models of cold fronts, with the goal of improving both scientific understanding and operational forecasting.
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Deremble, Bruno, Guillaume Lapeyre, and Michael Ghil. "Atmospheric Dynamics Triggered by an Oceanic SST Front in a Moist Quasigeostrophic Model." Journal of the Atmospheric Sciences 69, no. 5 (May 1, 2012): 1617–32. http://dx.doi.org/10.1175/jas-d-11-0288.1.

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Abstract To understand the atmospheric response to a midlatitude oceanic front, this paper uses a quasigeostrophic (QG) model with moist processes. A well-known, three-level QG model on the sphere has been modified to include such processes in an aquaplanet setting. Its response is analyzed in terms of the upper-level atmospheric jet for sea surface temperature (SST) fronts of different profiles and located at different latitudes. When the SST front is sufficiently strong, it tends to anchor the mean atmospheric jet, suggesting that the jet’s spatial location and pattern are mainly affected by the latitude of the SST front. Changes in the jet’s pattern are studied, focusing on surface sensible heat flux and on moisture effects through latent heat release. It is found that latent heat release due to moist processes is modified when the SST front is changed, and this is responsible for the meridional displacement of the jet. Moreover, both latent heat release and surface sensible heat flux contribute to the jet’s strengthening. These results highlight the role of SST fronts and moist processes in affecting the characteristics of the midlatitude jet stream and of its associated storm track, particularly their positions.
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Ramanuj, S. "CONTINUOUS DIFFUSION OF AUSTRIAN MODEL GERMAN FRONT VOWELS: A SOCIOLINGUISTIC ANALYSIS." CURRENT RESEARCH JOURNAL OF PHILOLOGICAL SCIENCES 02, no. 05 (May 30, 2021): 18–19. http://dx.doi.org/10.37547/philological-crjps-02-05-05.

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In Austrian Model German ASG , the vowels in the words Beeren and Bärenare ordinarily respected to be consolidated. Some acoustic investigations on ASG additionally recommend a consolidation between the vowels as in Maitland Mitteand even between the BEEREN/BÄREN consolidation and the MIETE vowel. This paper re-examines these consolidations from a sociolinguistic perspective and shows that more established speakers will in general union the vowels more than more youthful speakers. This focuses towards a continuous scattering or 'unmerger' and we contend that this is an aftereffect of convenience toward Model German as it is articulated in Germany.
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Zhang, Xiyan, Yu Sheng, Long Huang, Xubin Huang, and Binbin He. "Application of the Segregation Potential Model to Freezing Soil in a Closed System." Water 12, no. 9 (August 28, 2020): 2418. http://dx.doi.org/10.3390/w12092418.

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Previous studies have shown that an accurate prediction of frost heaves largely depends on the pore water pressure and hydraulic conductivity of frozen fringes, which are difficult to determine. The segregation potential model can avoid this problem; however, the conventional segregation potential is considered to be approximately unchanged at a steady state and only valid in an open system without dehydration in the unfrozen zone. Based on Darcy’s law and the conventional segregation potential, the segregation potential was expressed as a function of the pore water pressure at the base of the ice lens, the pore water pressure at the freezing front, the freezing temperature, the segregation freezing temperature and the hydraulic conductivity of the frozen fringe. This expression indicates that the segregation potential under quasi-steady-state conditions is not a constant in a closed system, since the pore water pressure at the freezing front varies with the freezing time owing to the dehydration of the unfrozen zone, and that when the pore water pressure at the freezing front is equal to that at the base of the ice lens, the water migration and frost heave will be terminated. To analyze the possibility of applying the segregation potential model in a closed system, a series of one-sided frost heave tests under external pressure in a closed system were carried out in a laboratory, and the existing frost heaving test data from the literature were also analyzed. The results indicate that the calculated frost heave was close to the tested data, which shows the applicability of the model in a closed system. In addition, the results show the rationality of calculating the segregation potential from the frost heaving test by comparing the potential with that calculated from the numerical simulation results. This study attempted to extend the segregation potential model to freezing soil in a closed system and is significant to the study of frost heaves.
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Scales, Kylie L., Peter I. Miller, Clare B. Embling, Simon N. Ingram, Enrico Pirotta, and Stephen C. Votier. "Mesoscale fronts as foraging habitats: composite front mapping reveals oceanographic drivers of habitat use for a pelagic seabird." Journal of The Royal Society Interface 11, no. 100 (November 6, 2014): 20140679. http://dx.doi.org/10.1098/rsif.2014.0679.

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The oceanographic drivers of marine vertebrate habitat use are poorly understood yet fundamental to our knowledge of marine ecosystem functioning. Here, we use composite front mapping and high-resolution GPS tracking to determine the significance of mesoscale oceanographic fronts as physical drivers of foraging habitat selection in northern gannets Morus bassanus . We tracked 66 breeding gannets from a Celtic Sea colony over 2 years and used residence time to identify area-restricted search (ARS) behaviour. Composite front maps identified thermal and chlorophyll- a mesoscale fronts at two different temporal scales—(i) contemporaneous fronts and (ii) seasonally persistent frontal zones. Using generalized additive models (GAMs), with generalized estimating equations (GEE-GAMs) to account for serial autocorrelation in tracking data, we found that gannets do not adjust their behaviour in response to contemporaneous fronts. However, ARS was more likely to occur within spatially predictable, seasonally persistent frontal zones (GAMs). Our results provide proof of concept that composite front mapping is a useful tool for studying the influence of oceanographic features on animal movements. Moreover, we highlight that frontal persistence is a crucial element of the formation of pelagic foraging hotspots for mobile marine vertebrates.
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BIRMAN, V. K., B. A. BATTANDIER, E. MEIBURG, and P. F. LINDEN. "Lock-exchange flows in sloping channels." Journal of Fluid Mechanics 577 (April 19, 2007): 53–77. http://dx.doi.org/10.1017/s002211200600437x.

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Two-dimensional variable-density Navier–Stokes simulations have been conducted in order to investigate the effects of a slope on the classical lock-exchange flow. Simulations of full lock releases show that the flow goes through an initial quasi-steady phase that is characterized by a constant front velocity. This quasi-steady front velocity has a maximum for slope angles around 40°, and it persists up to a dimensionless time of the order of 10. The flow subsequently undergoes a transition to a second phase with a larger, unsteady, front velocity. These computational findings were confirmed by experimental observations of lock-exchange flows in a tube of circular cross-section.The reason for the observed transition from a quasi-steady front velocity to a larger, unsteady, value is found in the continuous acceleration of the stratified fluid layers connecting the two fronts by the streamwise component of the gravity vector. This acceleration leads to a situation where the fluid layers behind the current front move faster than the front itself. Initially the resulting addition of fluid to the current front from behind affects only the size of the front, while its velocity remains unchanged. Eventually, the current front is unable to absorb more fluid from behind and its velocity has to increase, thereby triggering the transition to the second, unsteady, phase. The transition time is determined as a function of the slope and the density ratio of the two fluids. For increasing density contrast, the transition is seen to occur earlier for the denser current.Conceptually simple models based on the analysis by Thorpe (1968) are compared with simulation results for the flow in the region connecting the fronts. For the early stages of the flow a two-layer stratification model is found to be appropriate, while the later stages require a three-layer stratification model, owing to the intense mixing in the central part of the channel cross-section. These models are employed to estimate the time after which the accelerating stratified fluid layers will affect the velocities of the current fronts. They provide upper and lower estimates for the transition time which are in good agreement with the simulation results.
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Achtemeier, Gary L., and Scott L. Goodrick. "Adding to Fire Fighter Safety by Including Real-Time Radar Data in Short-Range Forecasts of Thunderstorm-Induced Wind Shifts." Fire 4, no. 3 (September 1, 2021): 55. http://dx.doi.org/10.3390/fire4030055.

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Abrupt changes in wind direction and speed caused by thunderstorm-generated gust fronts can, within a few seconds, transform slow-spreading low-intensity flanking fires into high-intensity head fires. Flame heights and spread rates can more than double. Fire mitigation strategies are challenged and the safety of fire crews is put at risk. We propose a class of numerical weather prediction models that incorporate real-time radar data and which can provide fire response units with images of accurate very short-range forecasts of gust front locations and intensities. Real-time weather radar data are coupled with a wind model that simulates density currents over complex terrain. Then two convective systems from formation and merger to gust front arrival at the location of a wildfire at Yarnell, Arizona, in 2013 are simulated. We present images of maps showing the progress of the gust fronts toward the fire. Such images can be transmitted to fire crews to assist decision-making. We conclude, therefore, that very short-range gust front prediction models that incorporate real-time radar data show promise as a means of predicting the critical weather information on gust front propagation for fire operations, and that such tools warrant further study.
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Dissertations / Theses on the topic "Modely front"

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Horký, Miroslav. "Modely hromadné obsluhy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232033.

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The master’s thesis solves models of queueing systems, which use the property of Markov chains. The queueing system is a system, where the objects enter into this system in random moments and require the service. This thesis solves specifically such models of queueing systems, in which the intervals between the objects incomings and service time have exponential distribution. In the theoretical part of the master’s thesis I deal with the topics stochastic process, queueing theory, classification of models and description of the models having Markovian property. In the practical part I describe realization and function of the program, which solves simulation of chosen model M/M/m. At the end I compare results which were calculated in analytic way and by simulation of the model M/M/m.
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Song, Yuanjun. "Implementation of a Recoder Front-End." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5553.

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VizzAnalyzer is a program analysis tool that can be used for analyzing software programs. It relies on so called Front-Ends for information extraction from various sources like C or Java source code. It allows analyzing different source code by mapping the language specific front-end meta-model onto a common meta-model, on which analysis are defined. Right now we use the Eclipse Parser for parsing Java source code. This requires an Eclipse installation involving a large number of dependencies in order to work with Java source code. Yet, this is not always feasible; we want to be independent from Eclipse using an alternative parser.

Recoder is a Java meta-programming application program interface (API) that can be used to write Java programs that manipulate and analyze other Java programs. The Recoder framework provides over an application programming interface detailed access to the source code in form of an abstract syntax tree (AST). It has a small footprint and no external dependencies.

We create the Recoder Front-End as alternative to the existing Eclipse front-end. This includes the definition of a mapping between Recoder Front-End Meta-Model to Common Meta-Model. The mapping result will be used by VizzAnalyzer to do further analysis work. This Bachelor thesis documents relevant theory regarding Recoder Front-End and discusses its development and implementation.

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Van, Zyl Hillet. "Innovation models and the front-end of product innovation." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019/1280.

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Chavez, Rodriguez Adolfo 1951. "Modeling mountain-front recharge to regional aquifers." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/191124.

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The estimation of mountain-front recharge to regional aquifers is approached from a hydroclimatic standpoint. Analytical models of the seasonal water yield and streamflow are developed in this dissertation. These models are specialized for hard-rock mountainous watersheds where deep percolation occurs through fractures exclusively. Input variables are considered to be stochastic, and a relationship between precipitation and surface runoff is derived by using a deterministic physical process. Streamflow models for the summer and winter rainy seasons are developed separately in terms of known parameters of the storm process and unknown parameters of the physical process. The winter model considers the generation of surface runoff from both rainfall and snowmelt. These models include the long-term effective subsurface outflow from the mountainous watershed, or mountain-front recharge, as one of the parameters to be identified. The parameter estimation problem is posed in the framework of maximum likelihood theory, where prior information about the model parameters and a suitable weighting scheme for the error terms in the estimation criterion are included. The issues of model and parameter identifiability, uniqueness and stability are addressed, and strategies to mitigate identifiability problems in our modeling are discussed. Finally, the seasonal streamflow models are applied to three mountainous watersheds in the Tucson basin, and maximum likelihood estimates of mountain-front recharge and other model and statistical parameters are obtained. The analysis of estimation errors is performed in both the eigenspace and the original space of the parameters.
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Ferris, P. D. "Frontal structure in a mesoscale model." Thesis, University of Reading, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234649.

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Alvarado, Mamani Ulises. "Aplicación de indicadores nativos de fluorescencia para la evaluación rápida de daño térmico en el procesado de leche." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/406093.

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L'objectiu d'aquesta tesi és l'aplicació d'indicadors nadius de fluorescència per a la quantificació ràpida dels canvis generats per la calor en diversos marcadors de dany tèrmic, com ara: hidroximetilfurfural (HMF), grups sulfhidril (-SH), àcid ascòrbic (AA ) i riboflavina (RBF) en llet desnatada mitjançant espectroscòpia de fluorescència "front-face". Es van dur a terme quatre experiments; en els dos primers es va estudiar la cinètica de desaparició i / o aparició dels marcadors indicats i, es van construir models cinètics a partir de la informació generada, així com de predicció mitjançant marcadors de fluorescència. En el tercer experiment, amb la utilització de dos fluorímetres diferents (sobretaula i fibra òptica), es van validar i recalibrar els models de predicció obtinguts anteriorment, emprant mostres generades en planta pilot en condicions industrials. En el cas dels models cinètics, aquests van ser validats i recalibrats combinant dades dels tres experiments per tal d'ampliar el nombre de mostres i obtenir models millorats. L'aparició i / o degradació dels marcadors químics estudiats es va ajustar a cinètiques de primer ordre. Es van estimar alguns paràmetres cinètics com ara l'energia d'activació, constant preexpronencial d'Arrhenius i coeficient tèrmic. Durant el procés de validació dels models matemàtics de predicció dels marcadors, indicadors estadístics com ara CV (coeficient de variació) i SEP (error estàndard de predicció) van resultar elevats; més encara amb les dades de fibra òptica, a causa de diferències de configuració òptica entre els espectròmetres de sobretaula i fibra òptica. Per això es va realitzar per una banda un recalibrat dels models de sobretaula amb les dades dels tres experiments, si bé en el cas de l'equip de fibra òptica es va procedir al calibratge emprant exclusivament dades de planta pilot generats amb el tercer experiment i consegüent validació mitjançant el mètode de validació creuada "leave one out". La fluorescència del triptòfan, compostos intermedis de Maillard i riboflavina excitada a 370 nm van ser els predictors més importants en el calibratge dels models. El millor model seleccionat tant per a l'equip de sobretaula com per al de fibra òptica va ser el corresponent a la predicció de l'àcid ascòrbic amb CV <12% mentre que els models amb major variabilitat d'error van ser els del hidroximetilfurfural amb CV <45%. En un quart experiment es va desenvolupar un mètode de quantificació ràpida de riboflavina mitjançant la mesura de fluorescència "front-face". Els valors obtinguts amb el model desenvolupat per quantificar la riboflavina en llets comercials no van ser significativament diferents dels obtinguts amb els mètodes convencionals (HPLC). La fluorescència "front-face" és un mètode ràpid, senzill i sense manipulació de mostra que permet calibrar models de predicció dels marcadors de dany tèrmic en llet. L'aplicació en línia dels models desenvolupats presenta potencial per a la millora del control dels tractaments tèrmics en llet, si bé els resultats obtinguts fins al moment indiquen que la implementació dels mateixos requeriria una etapa prèvia de calibratge en planta.
El objetivo de esta tesis es la aplicación de indicadores nativos de fluorescencia para la cuantificación rápida de los cambios generados por el calor en varios marcadores de daño térmico, tales como: hidroximetilfurfural (HMF), grupos sulfhidrilo (-SH), ácido ascórbico (AA) y riboflavina (Rbf) en leche desnatada mediante espectroscopía de fluorescencia “front-face”. Se llevaron a cabo cuatro experimentos: en los dos primeros se estudió la cinética de desaparición y/o aparición de los marcadores indicados y, a partir de la información generada, se construyeron modelos cinéticos, así como de predicción mediante marcadores de fluorescencia. En el tercer experimento, con la utilización de dos fluorímetros diferentes (sobremesa y fibra óptica), se validaron y recalibraron los modelos de predicción obtenidos anteriormente, empleando muestras generadas en planta piloto en condiciones industriales. En el caso de los modelos cinéticos, éstos fueron validados y recalibrados combinando datos de los tres experimentos a fin de ampliar el número de muestras y obtener modelos mejorados. La aparición y/o degradación de los marcadores químicos estudiados se ajustó a cinéticas de primer orden. Se estimaron algunos parámetros cinéticos tales como la energía de activación, la constante preexponencial de Arrhenius y el coeficiente térmico. Durante el proceso de validación de los modelos matemáticos de predicción de los marcadores, los indicadores estadísticos tales como CV (coeficiente de variación) y SEP (error estándar de predicción) resultaron elevados; más aún con los datos de fibra óptica, debido a diferencias de configuración óptica entre los espectrómetros de sobremesa y de fibra óptica. Por ello se realizó por una parte un recalibrado de los modelos de sobremesa con los datos de los tres experimentos, si bien en el caso del equipo de fibra óptica se procedió a la calibración empleando exclusivamente datos de planta piloto generados con el tercer experimento y consiguiente validación mediante el método de validación cruzada “leave one out”. La fluorescencia del triptófano, los compuestos intermedios de Maillard y la riboflavina excitada a 370 fueron los predictores más importantes en la calibración de los modelos. El mejor modelo seleccionado tanto para el equipo de sobremesa como para el de fibra óptica fue el correspondiente a la predicción del ácido ascórbico con CV<12% mientras que los modelos con mayor variabilidad de error fueron los del hidroximetilfurfural con CV<45%. En un cuarto experimento se desarrolló un método de cuantificación rápida de riboflavina mediante la medida de fluorescencia “front-face”. Los valores obtenidos con el modelo desarrollado para cuantificar la riboflavina en leches comerciales no fueron significativamente diferentes de los obtenidos con los métodos convencionales (HPLC). La fluorescencia “front-face” es un método rápido, sencillo y sin manipulación de muestra que permite calibrar modelos de predicción de los marcadores de daño térmico en leche. La aplicación en línea de los modelos desarrollados presenta un gran potencial para la mejora del control de los tratamientos térmicos en leche, si bien los resultados obtenidos hasta el momento indican que la implementación de los mismos requeriría una etapa previa de calibración en planta.
The objective of this thesis is the application of native indicators of fluorescence for the rapid quantification of heat-induced changes in several thermal damage markers, such as hydroxymethylfurfural (HMF), sulfhydryl groups(-SH), ascorbic acid (AA) and riboflavin (Rbf) in skim milk by front-face fluorescence spectroscopy. Four experiments were carried out: in the first two, the kinetics of disappearance and / or appearance of the indicated markers were studied and kinetic models were constructed from the information generated as well as prediction models by fluorescence markers. In the third experiment, with the use of two different fluorimeters (benchtop and optic fiber), the prediction models previously obtained were validated and recalibrated using samples generated in a pilot plant under industrial conditions. In the case of kinetic models, these were validated and recalibrated by combining data from the three experiments in order to increase the number of samples and obtain improved models. The appearance and / or degradation of the chemical markers studied was adjusted to first order kinetic equations. Some kinetic parameters such as activation energy, Arrhenius pre-exponential constant and thermal coefficient were estimated. During the validation process of the markers prediction models, statistical indicators such as CV (coefficient of variation) and SEP (standard error of prediction) were high; even higher with optic fiber data, due to differences in optical configuration between benchtop and optic fiber spectrometers. For this reason, a recalibration of the benchtop models with the data of the three experiments was carried out, although in the case of optic fiber equipment, calibration was carried out exclusively using the pilot plant data generated in the third experiment and validation using the leave one out cross validation method. The fluorescence of tryptophan, intermediates compounds of Maillard reaction and riboflavin excited at 370 nm were the most important predictors in the calibration of the models. The best model selected for both the benchtop and optic fiber equipment was the prediction of ascorbic acid with CV <12%, while the models with the highest error variability were for hydroxymethylfurfural with CV <45%. In a fourth experiment, a rapid quantification method of riboflavin was developed by the measurement of front-face fluorescence. The values obtained with the model developed to quantify riboflavin in commercial milks were not significantly different from those obtained with conventional methods (HPLC). Front-face fluorescence is a fast, simple method. Without the need of sample manipulation, allows calibration of thermal damage predictive models. The inline application of the developed models presents potential for the improvement of the control of thermal treatments in milk, although the results obtained so far indicate that the implementation of the models would require a previous stage of calibration in plant.
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Lodico, Marc Richard. "SQLSDM : a SQL front-end semantic data model /." Online version of thesis, 1989. http://hdl.handle.net/1850/10620.

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Slámová, Kateřina. "Simulace stochastických modelů hromadné obsluhy." Master's thesis, Vysoká škola ekonomická v Praze, 2007. http://www.nusl.cz/ntk/nusl-932.

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Práce vystihuje teoretické poznatky z oblasti teorie hromadné obsluhy a simulace a následně jsou aplikovány poznatky do praxe. Pro případovou studii je využíván simulační software Simul8 a podpůrný program Crystal Ball, pomocí nichž je vytvořen model. Cílem je navrhnout nejlepší řešení daného problému a zhodnotit systém z hlediska struktury a funkčnosti. S modelem je provedeno několik experimentů a následně je posouzena vhodnost či nevhodnost použití jednotlivých variant.
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Barquet, Ana Paula Bezerra. "Creation of product-service systems (PSS) proposals in the fuzzy front-end." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18156/tde-04052015-101933/.

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Product-service systems (PSS), defined as a system of products, services, infrastructure, and networks that aims to satisfy customer needs, support business innovation and has the potential to lead to improved environmental performance. The adoption of PSS requires modifications in the business model of companies or even the creation of new ones. The decision to modify or create business models occurs in the fuzzy front-end through the development of proposals. In this sense, the creation of PSS proposals might assist the adoption of PSS business models in enterprises. However, companies still need support to adopt PSS business models due to three main reasons. First, most of the studies about PSS business models mention its importance but do not explore which content should compose such models. Second, PSS business models are explored considering a partial view of business model dimensions. Finally, there is a lack of methods and tools that support the adoption of PSS business models in the fuzzy front-end. Thereby, the aim of this study is to develop a method, named Configurator of PSS Proposals, to cope with these challenges and assist the creation of PSS proposals for current or new business models. By means of systematic literature review, consulting with experts and an explorative case study, the method was developed. It is composed by eight steps and each step addresses a business model dimension, e.g. value proposition. The steps encompass a range of tasks that must be performed in order to create a PSS proposal. To support carrying out the tasks, a help element is available. This help contains additional information to support the utilization of the method, such as: examples of companies that adopted PSS and hints of practices, methods and tools. To evaluate the method, it was applied through a case study in the context of a research project. The aim was to create a PSS proposal for a bicycle concept and verify whether the method reach its purpose, i.e. is able to support the creation of a PSS proposal. Final considerations include contributions and limitations of this study. An example of contribution of the method is provision of a shared knowledge about PSS between different areas of expertise. As limitation, the lack of application of the method in a real case is highlighted. Additionally, future research is addressed based mainly on the insights gathered in the second case study, e.g. the inclusion of new tasks and relations between them.
Sistema produto-serviço (SPS), definido como um sistema de produtos e serviços, infraestrutura e networks e que visa aumentar a satisfação de clientes, auxilia na inovação nos negócios e tem o potencial de levar à melhoria de desempenho ambiental. A adoção de SPS requer a criação ou modificação dos modelos de negócios das empresas. A decisão de criar ou modificar um modelo de negócio ocorre no fuzzy front-end por meio da criação de propostas. Desta forma, acredita-se que criação de propostas para SPS auxilia na adoção de modelos de negócio para SPS. No entanto, empresas requerem auxilio na adoção de modelos de negócio para PSS devido a três principais motivos. Primeiro, a maioria dos estudos sobre modelos de negócio para SPS mencionam sua importância, porém não exploram o conteúdo que deve compor esses modelos. Segundo, pesquisas sobre modelos de negócio para SPS levam em consideração uma visão parcial das dimensões de modelos de negócio. Finalmente, é constatada a carência de métodos e ferramentas que auxiliem na adoção de modelos de negócio para PSS no fuzzy front-end. O objetivo desse trabalho é desenvolver um método, denominado Configurador de Propostas de SPS, que guie empresas na criação de propostas de SPS para negócios novos e existentes. Por meio de revisão sistemática de literatura, consulta com especialistas e um estudo de caso exploratório, o método foi desenvolvido. Ele é composto por oito passos e cada passo aborda uma dimensão do modelo de negócios, como por exemplo, proposição de valor. Ainda, cada passo engloba várias tarefas que devem ser executadas para que a proposta de SPS seja criada. Como suporte para realizar as tarefas, um elemento ajuda foi criado. Este elemento inclui exemplos de empresas que adotaram SPS e dicas de práticas, métodos e ferramentas. Com objetivo de avaliar o método, uma aplicação no contexto de um projeto de pesquisa foi realizada, por meio de um estudo de caso. O objetivo dessa aplicação foi criar uma proposta de SPS para um conceito de uma bicicleta e verificar se o método alcança seu propósito, que é ajudar na criação de propostas de SPS. Considerações finais incluem contribuições e limitações do estudo. Um exemplo de contribuição do método é o fornecimento de um conhecimento compartilhado sobre PSS entre diferentes áreas de conhecimento. A falta de aplicação do método em um caso real é uma das limitações deste trabalho. Adicionalmente, pesquisas futuras são sugeridas, como por exemplo, a inclusão de novas tarefas no método e novas relações entre elas, conforme sugerido pelos participantes do segundo estudo de caso.
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Li, Lin. "RF transceiver front-end design for testability." Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2256.

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In this thesis, we analyze the performance of a loop-back built-in-self-test for a RF transceiver front-end. The tests aim at spot defects in a transceiver front-end and they make use of RF specifications such as NF (Noise Figure), G (power gain) and IIP3 (third order Intercept point). To enhance fault detectability, RF signal path sensitization is introduced. We use a functional RF transceiver model that is implemented in MatLab™ to verify this analysis.

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Books on the topic "Modely front"

1

Karskens, Arnold. Berichten van het front. Amsterdam: Nijgh & Van Ditmar, 1995.

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Guymon, Gary L. Mathematical model of frost heave and thaw settlement in pavements. Washington, D.C: U.S. Dept. of Transportation, Federal Aviation Administration, Research and Development Service, 1993.

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Black, Patrick B. RIGIDICE model of secondary frost heave. [Hanover, NH]: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1995.

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Schönhuber, Franz. Le Pen: Der Rebell : Front National, Modell für Deutschland. Berg: VGB-Verlagsgesellschaft, 1997.

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Bravery in battle: Stories from the front line. London: Arms and Armour Press, 1997.

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Lindsey, David A. An introduction to sand and gravel deposit models, Front Range urban corridor. [Reston, Va.?]: U.S. Dept. of the Interior, U.S. Geological Survey, 1997.

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Gericke, Manfred. Frontenanalyse als Aufgabe der Variationsrechnung und der optimalen Steuerung. Berlin: Akademie-Verlag, 1990.

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Edlin, Aaron S. Cadillac contracts and up-front payments: Efficient investment under expectation damages. Cambridge, MA: National Bureau of Economic Research, 1994.

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Mazzacurati, Marino. Mazzacurati e gli artisti di "Fronte". Roma: De Luca, 1988.

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The taste of battle: Front line action, 1914-1991. London: Cassell, 2000.

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Book chapters on the topic "Modely front"

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Lanciaux, Ryan. "Our First Storybook Stories." In Modern Front-end Architecture, 29–45. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_3.

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Lanciaux, Ryan. "Interacting with API Data." In Modern Front-end Architecture, 83–93. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_7.

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Lanciaux, Ryan. "Creating Reusable Components." In Modern Front-end Architecture, 47–57. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_4.

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Lanciaux, Ryan. "Ensuring the Quality of Our Components." In Modern Front-end Architecture, 73–82. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_6.

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Lanciaux, Ryan. "Automating Repetitive Tasks." In Modern Front-end Architecture, 107–16. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_9.

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Lanciaux, Ryan. "Communicating Our Components." In Modern Front-end Architecture, 117–24. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_10.

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Lanciaux, Ryan. "Styling." In Modern Front-end Architecture, 59–72. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_5.

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Lanciaux, Ryan. "Configuring Our Workspace." In Modern Front-end Architecture, 13–27. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_2.

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Lanciaux, Ryan. "The Mise en Place Philosophy." In Modern Front-end Architecture, 1–11. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_1.

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Lanciaux, Ryan. "Building Our Application." In Modern Front-end Architecture, 95–106. Berkeley, CA: Apress, 2021. http://dx.doi.org/10.1007/978-1-4842-6625-0_8.

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Conference papers on the topic "Modely front"

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"FRONT MATTER." In Mathematical Models and Methods for Smart Materials. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776273_fmatter.

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"[Front cover]." In 2013 International Model-Driven Requirements Engineering Workshop (MoDRE). IEEE, 2013. http://dx.doi.org/10.1109/modre.2013.6597255.

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"[Front cover]." In 2017 Internet of Things - Business Models, Users, and Networks. IEEE, 2017. http://dx.doi.org/10.1109/ctte.2017.8260924.

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"[Front cover]." In 2009 IEEE Workshop on Hybrid Intelligent Models and Applications. IEEE, 2009. http://dx.doi.org/10.1109/hima.2009.4937812.

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"Front Matter: Volume 6751." In Geoinformatics 2007: Cartographic Theory and Models. SPIE, 2007. http://dx.doi.org/10.1117/12.766874.

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"[Front matter]." In 2012 IEEE Model-Driven Requirements Engineering Workshop (MoDRE 2012). IEEE, 2012. http://dx.doi.org/10.1109/modre.2012.6360080.

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"[Front matter]." In 2013 IEEE Workshop on Hybrid Intelligent Models and Applications (HIMA). IEEE, 2013. http://dx.doi.org/10.1109/hima.2013.6615014.

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"[Front cover]." In 2018 Conference on Electrotechnology: Processes, Models, Control and Computer Science (EPMCCS). IEEE, 2018. http://dx.doi.org/10.1109/epmccs.2018.8596634.

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"[Front cover]." In 2019 Modern Safety Technologies in Transportation (MOSATT). IEEE, 2019. http://dx.doi.org/10.1109/mosatt48908.2019.8944123.

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"FRONT MATTER." In Symmetry and Modern Physics - Yang Retirement Symposium. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812795083_fmatter.

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Reports on the topic "Modely front"

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Poyneer, L. Fast modal wave-front reconstruction. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/15014303.

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Blumen, William. Front-Boundary Layer Models from STORM-FEST Observations. Fort Belvoir, VA: Defense Technical Information Center, October 1995. http://dx.doi.org/10.21236/ada301511.

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Blumen, William. Front-Boundary Layer Models from STORM-FEST Observations. Fort Belvoir, VA: Defense Technical Information Center, May 1994. http://dx.doi.org/10.21236/ada279907.

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Srivastava, Prem P. Light-Front Quantized Chiral Model and its Vacuum Structure. Office of Scientific and Technical Information (OSTI), November 1998. http://dx.doi.org/10.2172/10194.

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Shaver, Greg, and Miles Droege. Develop and Deploy a Safe Truck Platoon Testing Protocol for the Purdue ARPA-E Project in Indiana. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317314.

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Hilly terrain poses challenges to truck platoons using fixed set speed cruise control. Driving the front truck efficiently on hilly terrain improves both trucks fuel economies and improves gap maintenance between the trucks. An experimentally-validated simulation model was used to show fuel savings for the platoon of 12.3% when the front truck uses long horizon predictive cruise control (LH-PCC), 8.7% when the front truck uses flexible set speed cruise control, and only 1.2% when the front truck uses fixed set speed cruise control. Purdue, Peloton, and Cummins have jointly configured two Peterbilt 579 trucks for relevant combinations of: (1) coordinated shifting, (2) constant or variable platoon gap controls, (3) flexible or constant speed setpoint cruise control of the front trucks, and (4) long-horizon predictive cruise control (LHPCC) of the front truck. Confirmation of this functionality during platooning was demonstrated at the Continental Test track in Uvalde, Texas. In Indiana, on-road experiments were limited to single truck operation with long-horizon predictive cruise control, flexible set speed cruise control, and constant setpoint cruise control. Data from all of the above was used to improve the fidelity of simulations used to arrive at the fuel savings and gap control findings for hilly terrain per what is summarized in the findings section. Additionally, in early summer 2020, Purdue submitted to, and received improvement from, INDOT for a safe truck platoon testing protocol (located in this report’s appendix), which could not be implemented in Indiana before the end of the project because of COVID-19. Presentations of the subject matter at COMVEC, MAASTO, Purdue Road School, and the Work Truck Show are listed in the appendix.
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Nishimura, Masatsugu, Yoshitaka Tezuka, Enrico Picotti, Mattia Bruschetta, Francesco Ambrogi, and Toru Yoshii. Study of Rider Model for Motorcycle Racing Simulation. SAE International, January 2020. http://dx.doi.org/10.4271/2019-32-0572.

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Various rider models have been proposed that provide control inputs for the simulation of motorcycle dynamics. However, those models are mostly used to simulate production motorcycles, so they assume that all motions are in the linear region such as those in a constant radius turn. As such, their performance is insufficient for simulating racing motorcycles that experience quick acceleration and braking. Therefore, this study proposes a new rider model for racing simulation that incorporates Nonlinear Model Predictive Control. In developing this model, it was built on the premise that it can cope with running conditions that lose contact with the front wheels or rear wheels so-called "endo" and "wheelie", which often occur during running with large acceleration or deceleration assuming a race. For the control inputs to the vehicle, we incorporated the lateral shift of the rider's center of gravity in addition to the normally used inputs such as the steering angle, throttle position, and braking force. We compared the performance of the new model with that of the conventional model under constant radius cornering and straight braking, as well as complex braking and acceleration in a single (hairpin) corner that represented a racing run. The results showed that the new rider model outperformed the conventional model, especially in the wider range of running speed usable for a simulation. In addition, we compared the simulation results for complex braking and acceleration in a single hairpin corner produced by the new model with data from an actual race and verified that the new model was able to accurately simulate the run of actual MotoGP riders.
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Fan, Yalin, Zhitao Yu, and Fengyan Shi. Are Hydrostatic Models Still Capable of Simulating Oceanic Fronts. Fort Belvoir, VA: Defense Technical Information Center, November 2016. http://dx.doi.org/10.21236/ada640860.

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Susskind, L., and M. Burkardt. A model of mesons based on {chi}SB in the light-front frame. Office of Scientific and Technical Information (OSTI), November 1994. http://dx.doi.org/10.2172/10195720.

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An, Ke, David A. McClintock, and Matthew J. Frost. Residual Stress Measurements of Front Window Welds in a Prototypical Spallation Neutron Source Target Module. Office of Scientific and Technical Information (OSTI), February 2018. http://dx.doi.org/10.2172/1459284.

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Rahai, Hamid, and Jeremy Bonifacio. Numerical Investigations of Virus Transport Aboard a Commuter Bus. Mineta Transportation Institute, April 2021. http://dx.doi.org/10.31979/mti.2021.2048.

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The authors performed unsteady numerical simulations of virus/particle transport released from a hypothetical passenger aboard a commuter bus. The bus model was sized according to a typical city bus used to transport passengers within the city of Long Beach in California. The simulations were performed for the bus in transit and when the bus was at a bus stop opening the middle doors for 30 seconds for passenger boarding and drop off. The infected passenger was sitting in an aisle seat in the middle of the bus, releasing 1267 particles (viruses)/min. The bus ventilation system released air from two linear slots in the ceiling at 2097 cubic feet per minute (CFM) and the air was exhausted at the back of the bus. Results indicated high exposure for passengers sitting behind the infectious during the bus transit. With air exchange outside during the bus stop, particles were spread to seats in front of the infectious passenger, thus increasing the risk of infection for the passengers sitting in front of the infectious person. With higher exposure time, the risk of infection is increased. One of the most important factors in assessing infection risk of respiratory diseases is the spatial distribution of the airborne pathogens. The deposition of the particles/viruses within the human respiratory system depends on the size, shape, and weight of the virus, the morphology of the respiratory tract, as well as the subject’s breathing pattern. For the current investigation, the viruses are modeled as solid particles of fixed size. While the results provide details of particles transport within a bus along with the probable risk of infection for a short duration, however, these results should be taken as preliminary as there are other significant factors such as the virus’s survival rate, the size distribution of the virus, and the space ventilation rate and mixing that contribute to the risk of infection and have not been taken into account in this investigation.
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