Готові списки джерел за темами / Turbulence of the environment

Добірка наукової літератури з теми "Turbulence of the environment"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Turbulence of the environment"

1

HORCHANI, SAMAH CHEMLI, and MAHMOUD ZOUAOUI. "ENVIRONMENT TURBULENCE EFFECT ON THE DYNAMICS OF INTELLECTUAL CAPITAL ACCUMULATION AND AMBIDEXTROUS INNOVATION." International Journal of Innovation Management 25, no. 05 (February 5, 2021): 2150058. http://dx.doi.org/10.1142/s1363919621500584.

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Анотація:
The aim of this paper is to study the influence of the environment on the link between intellectual capital and ambidextrous innovation. The environment has been considered taking into account the technological turbulence and the market turbulence. Using a questionnaire survey approach, data were obtained from 155 directors representing Tunisian SMEs. Two main theoretical implications were highlighted. The first is the extent of the intellectual capital contribution, with its human, organizational and relational components, to the reading of the ambidextrous innovation within the organization. The second is the moderating role of environmental turbulence. From a practical side, the study tried to reap the intellectual capital benefits and the intermediate effect of environmental turbulence to improve the manager’s yields in term of innovation. Interestingly, results show that human capital affects ambidextrous innovation. It influences radical innovation more than incremental innovation. Relationship capital promotes only incremental innovation. Organizational capital influences ambidextrous innovation. Its effect on incremental innovation is greater than on radical innovation. Both technological and market turbulences moderate negatively the human capital effect on incremental innovation. Counter to our expectations, however, environmental turbulence does not moderate the interrelationships selectively between relational capital, organizational capital and ambidextrous innovation. The present study is one of the few studies conducted in Tunisia investigating the field of intellectual capital and the first studying its effect on the ambidextrous innovation in a turbulent environment.
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2

Hong, J., J. Kim, H. Ishikawa, and Y. Ma. "Surface layer similarity in the nocturnal boundary layer: the application of Hilbert-Huang transform." Biogeosciences 7, no. 4 (April 19, 2010): 1271–78. http://dx.doi.org/10.5194/bg-7-1271-2010.

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Abstract. Turbulence statistics such as flux-variance relationship are critical information in measuring and modeling ecosystem exchanges of carbon, water, energy, and momentum at the biosphere-atmosphere interface. Using a recently proposed mathematical technique, the Hilbert-Huang transform (HHT), this study highlights its possibility to quantify impacts of non-turbulent flows on turbulence statistics in the stable surface layer. The HHT is suitable for the analysis of non-stationary and intermittent data and thus very useful for better understanding the interplay of the surface layer similarity with complex nocturnal environment. Our analysis showed that the HHT can successfully sift non-turbulent components and be used as a tool to estimate the relationships between turbulence statistics and atmospheric stability in complex environments such as nocturnal stable boundary layer.
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3

Kharshiladze, O., and K. Chargazia. "Investigation of the strong turbulence in the geospace environment." Advances in Radio Science 13 (November 3, 2015): 243–50. http://dx.doi.org/10.5194/ars-13-243-2015.

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Анотація:
Abstract. Plasma vortices are often detected by spacecraft in the geospace (atmosphere, ionosphere, magnetosphere) environment, for instance in the magnetosheath and in the magnetotail region. Large scale vortices may correspond to the injection scale of turbulence, so that understanding their origin is important for understanding the energy transfer processes in the geospace environment. In a recent work, turbulent state of plasma medium (especially, ionosphere) is overviewed. Experimental observation data from THEMIS mission (Keiling et al., 2009) is investigated and numerical simulations are carried out. By analyzing the THEMIS data for that event, we find that several vortices in the magnetotail are detected together with the main one and these vortices constitute a vortex chain. Such vortices can cause the strong turbulent state in the different media. The strong magnetic turbulence is investigated in the ionsophere as an ensemble of such strongly localized (weakly interacting) vortices. Characteristics of power spectral densities are estimated for the observed and analytical stationary dipole structures. These characteristics give good description of the vortex structures.
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4

Stuck, Maxime, Alvaro Vidal, Pablo Torres, Hassan M. Nagib, Candace Wark, and Ricardo Vinuesa. "Spectral-Element Simulation of the Turbulent Flow in an Urban Environment." Applied Sciences 11, no. 14 (July 13, 2021): 6472. http://dx.doi.org/10.3390/app11146472.

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Анотація:
The mean flow and turbulence statistics of the flow through a simplified urban environment, which is an active research area in order to improve the knowledge of turbulent flow in cities, is investigated. This is useful for civil engineering, pedestrian comfort and for health concerns caused by pollutant spreading. In this work, we provide analysis of the turbulence statistics obtained from well-resolved large-eddy simulations (LES). A detailed analysis of this database reveals the impact of the geometry of the urban array on the flow characteristics and provides for a good description of the turbulent features of the flow within a simplified urban environment. The most prominent features of this complex flow include coherent vortical structures such as the so-called arch vortex, the horseshoe vortex and the roof vortex. These structures of flow have been identified by an analysis of the turbulence statistics. The influence of the geometry of urban environment (and particularly the street width and the building height) on the overall flow behavior has also been studied. Finally, the well-resolved LES results were compared with an available experimental database to discuss differences and similarities between the respective urban configurations.
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5

Wang, Zhenchuan, Guoli Qi, and Meijun Li. "Discussion on improved method of turbulence model for supercritical water flow and heat transfer." Thermal Science 24, no. 5 Part A (2020): 2729–41. http://dx.doi.org/10.2298/tsci190813007w.

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Анотація:
The turbulence model fails in supercritical fluid-flow and heat transfer simulation, owing to the drastic change of thermal properties. The inappropriate buoyancy effect model and the improper turbulent Prandtl number model are several of these factors lead to the original low-Reynolds number turbulence model unable to predict the wall temperature for vertically heated tubes under the deteriorate heat transfer conditions. This paper proposed a simplified improved method to modify the turbulence model, using the generalized gradient diffusion hypothesis approximation model for the production term of the turbulent kinetic energy due to the buoyancy effect, using a turbulence Prandtl number model for the turbulent thermal diffusivity instead of the constant number. A better agreement was accomplished by the improved turbulence model compared with the experimental data. The main reason for the over-predicted wall temperature by the original turbulence model is the misuse of the buoyancy effect model. In the improved model, the production term of the turbulent kinetic energy is much higher than the results calculated by the original turbulence model, especially in the boundary-layer. A more accurate model for the production term of the turbulent kinetic energy is the main direction of further modification for the low Reynolds number turbulence model.
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6

Falgarone, E., P. Hily-Blant, J. Pety, and G. Pineau des Forêts. "The turbulent environment of low-mass dense cores." Proceedings of the International Astronomical Union 2, S237 (August 2006): 24–30. http://dx.doi.org/10.1017/s1743921307001172.

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Анотація:
AbstractThe signatures of intermittent dissipation of turbulent energy have been sought in the translucent environment of a low-mass dense core. Molecular line observations reveal a network of narrow filamentary structures, found on statistical grounds to be the locus of the largest velocity shears. Three independent properties of these structures make them the plausible sites of intermittent dissipation of turbulence: (1) gas there is warmer and more diluted than average, (2) it bears the signatures of a non-equilibrium chemistry triggered by impulsive heating due to turbulence dissipation, and (3) the power that these structures radiate in the gas cooling lines (mostly H2) is so large that it balances the total energy injection rate of the turbulent cascade, for a volume filling factor of only a few percents, consistent with other observations in the Solar Neighborhood. These filamentary structures may act as tiny seeds of gas condensation in diffuse molecular gas. They do not exhibit the properties of steady-state low-velocity magneto-hydrodynamic (MHD) shocks, as presently modelled.
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7

Hong, J., J. Kim, H. Ishikawa, and Y. Ma. "Surface layer similarity in the nocturnal boundary layer: the application of Hilbert-Huang transform." Biogeosciences Discussions 6, no. 5 (October 8, 2009): 9677–99. http://dx.doi.org/10.5194/bgd-6-9677-2009.

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Анотація:
Abstract. Turbulence statistics such as flux-variance relationship is critical information in measuring and modeling carbon, water, energy, and momentum exchanges at the biosphere-atmosphere interface. Using a recently proposed mathematical technique, the Hilbert-Huang transform (HHT), this study highlights its possibility to quantify impacts of non-turbulent flows on turbulence statistics in the stable surface layer. The HHT is suitable for the analysis of non-stationary and intermittent data and thus very useful for better understanding of the interplay of the surface layer similarity with complex nocturnal environment. Our analysis showed that the HHT can successfully sift non-turbulent components and be used as a tool to estimate the relationships between turbulence statistics and atmospheric stability in complex environment such as nocturnal stable boundary layer.
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8

Vohra, Veena. "Organizational environments and adaptive response mechanisms in India." Journal of Indian Business Research 7, no. 1 (March 16, 2015): 21–44. http://dx.doi.org/10.1108/jibr-01-2014-0001.

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Анотація:
Purpose – The purpose of this paper is to investigate the nature of the organizational environments of Indian business organizations and to identify the adaptive response mechanisms that organizations use to cope with their environments. This paper also examines in detail the causal texture of the organizational environments and attempts to build a conceptual model mapping adaptive responses of organizations to different types of organizational environments. Design/methodology/approach – A constructivist stance was adopted in this exploratory study to capture the perceptions of the organizational leaders through the multiple case study design to capture the features of the organizational environments and their causal texture. The multiple case study design used an embedded mixed-methods approach to collect data. Within-case analysis and cross-case analysis were conducted to draw out prominent themes across cases ordered for particular organizational environment types. The study was conducted by following construct validity, internal reliability and external validity guidelines. Findings – The study highlights and describes in detail the characteristics of the different organizational environment types in India. It is revealed that a majority of Indian organizations exist in turbulent environments. There are differences in the adaptive response mechanisms of organizations in the environment types studied. The study specially focuses on the strategies adopted by Indian organizations to adapt to turbulent environments. Practical implications – This study maps the causal texture of organizational environments in India and maps the organizational adaptive responses to the environment for greater effectiveness. This study offers various strategies to cope with turbulent organizational environments and adds to the research focus on causal texture and adaptive capacities of organizations across different types of environments. Originality/value – This study contributes to an ignored subject area of organizational environments. Managing organizations in uncertain and turbulent environments is complex, and this study provides an understanding about the various types of adaptive mechanism that are used to cope with environmental turbulence. This study also attempts to answer several questions that previous research works have raised about strategies that organizations use when they fail to cope with environmental turbulence.
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9

Chen, Sisi, Peter Bartello, M. K. Yau, P. A. Vaillancourt, and Kevin Zwijsen. "Cloud Droplet Collisions in Turbulent Environment: Collision Statistics and Parameterization." Journal of the Atmospheric Sciences 73, no. 2 (February 1, 2016): 621–36. http://dx.doi.org/10.1175/jas-d-15-0203.1.

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Анотація:
Abstract The purpose of this paper is to quantify the influence of turbulence in collision statistics by separately studying the impacts of computational domain sizes, eddy dissipation rates (EDRs), and droplet sizes and eventually to develop an accurate parameterization of collision kernels. Direct numerical simulations (DNS) were performed with a relatively wide range of EDRs and Taylor microscale Reynolds numbers . EDR measures the turbulence intensity levels. DNS model studies have simulated homogeneous turbulence in a small domain in the cloud’s adiabatic core. Clouds clearly have much larger scales than current DNS can simulate. For this reason, it is emphasized that obtained from current DNS is fundamentally only a measure of the computational domain size for a given EDR and cannot completely describe the physical properties of cloud turbulence. Results show that the collision statistics are independent of the domain sizes and hence of the computational for droplet sizes no bigger than 25 μm as long as the droplet separation distance, which is on the order of the Kolmogorov scale in real clouds, is resolved. Instead, they are found to be highly correlated with EDRs and droplet sizes, and this correlation is used to formulate an improved parameterization scheme. The new scheme well represents the turbulent geometric collision kernel with a relative uncertainty of 14%. A comparison between different parameterizations is made, and the formulas proposed here are shown to improve the fit to the collision statistics.
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10

Zimbardo, G., A. Greco, L. Sorriso-Valvo, S. Perri, Z. Vörös, G. Aburjania, K. Chargazia, and O. Alexandrova. "Magnetic Turbulence in the Geospace Environment." Space Science Reviews 156, no. 1-4 (September 25, 2010): 89–134. http://dx.doi.org/10.1007/s11214-010-9692-5.

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Більше джерел

Дисертації з теми "Turbulence of the environment"

1

Read, Simon. "Transition to turbulence in a turbomachinery environment." Thesis, Cranfield University, 1997. http://dspace.lib.cranfield.ac.uk/handle/1826/10509.

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Анотація:
This thesis aims to contribute to the understanding of transitional flows in the blade boundary layers of axial compressors. Two experiments are described, the first examining in detail the transitional boundary layer on a simulated controlled-diffusion blade and the second surveying the mid-height flowfield in an embedded stage of a low-speed axial compressor. The velocity distribution on the simulated blade is identical to the Velocity distribution on the suction surface of the blades in the axial compressor. At 2 Reynolds numbers and 3 levels of freestream turbulence, a single hot wire was used to conduct a boundary layer survey on a simulated controlled-diffusion blade. Integral parameters of the boundary layers are explored to dene the length and nature of transition. At low Reynolds number there is a separated or near separated region at the leading edge which does not lead to turbulence. Transition covers a length of approximately 20% of the blade chord, starting between 20% and 30% chord. The position of transition is strongly influenced by the level of freestream turbulence. Most of the transition process occurs within the decelerating flow region which exists from 20% of the chord. At high Reynolds number, a leading edge separation bubble leads to transition within 2% of the blade chord. Abu-Ghannam & Shaws correlation for the start and length of transition was found to predict the start of transition well for attached flows, but could not be relied upon for separated flows. It is apparent that the correlation was not designed for the very strong Velocity gradients in the leading edge region, and probably not for separated flow. _ Three flow conditions in the axial compressor were used: design speed, peak efficiency, low Reynolds number at peak efficiency (the machine was slowed to one-quarter speed) and design speed near the stall. Using hot wires at mid-height, axial and circumferential velocity and turbulence information was obtained. Wakes and structure within wakes are visible in the turbulence and Reynolds stress distributions. The wakes of more than one upstream blade row are visible; the region where two wakes intersect gives some information about interaction between a stator blade Wake and a rotor blade boundary layer. Some information is available about the length scale 'distribution inside and outside wakes. Secondary flow in the axial-circumferential plane shows motion within wakes and a vortex in the near-stall flowfield, shed preferentially at one point in the blade-passing cycle.
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2

Westerberg, Mats. "Managing in turbulence : an empirical study of small firms operating in a turbulent environment." Doctoral thesis, Luleå tekniska universitet, Innovation och Design, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18430.

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Анотація:
This thesis deals with how small firms, and especially their CEOs, manage their situation in times of high environmental turbulence. Eight firms have been chosen for the empirical study based on their performance and the CEO’s self-efficacy and tolerance for ambiguity. Interviews with the CEO and employees at each firm, observations, gathering of annual reports and a questionnaire are the principal means used for data collection. The results show that the CEO is very influential at all firms, regardless how the company performs. A CEO that tolerate uncertainty is better able to engage in enterprising, which seems necessary in turbulence. A CEO with high self- efficacy is generally able to control his firms destiny by having access to the appropriate resources for the task (e.g. own ability and network). However, too high self-efficacy could be a sign of dysfunctional overconfidence, where the CEO dismiss relevant information from actors around him.
Godkänd; 1998; 20061120 (haneit)
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3

Bosco, Carol. "The Relationship Between Environmental Turbulence, Workforce Agility and Patient Outcomes." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195013.

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Анотація:
For years heath care workers have been dealing with environmental changes which have created turbulent, complex work environments. Turbulence has been considered a negative phenomenon. However Workforce Agility may be a positive response to Environmental Turbulence. Other disciplines are familiar with the term Turbulence and Workforce Agility but there is little research available on this concept despite the impact that they may have on patient outcomes.The purpose of this research was to identify the relationship between Environmental Turbulence, Workforce Agility and Patient Outcomes through the examination of four alternative theoretical models.This research was conducted using secondary analysis of the IMPACT data set (Verran, Effken & Lamb, 2001-2004). The data were reanalyzed in order to answer different questions than the primary study. Causal modeling with path analysis and regression analysis was conducted to answer the research questions. Three questions included the use of either a moderator variable or mediator variable.The setting for the IMPACT Study was acute care hospitals in the Southwestern region of the United States. For the IMPACT study, the sample consisted of patient care units from teaching and non-teaching hospitals. Subjects consisted of staff members who were employed on the patient care units.Data collected from the Registered Nurses were used for the secondary analysis because this research was interested in looking primarily at the nursing unit. The total RN staff assigned to patient care units who responded to the questionnaires was N=454. The total number of patients who responded to the survey was N=1179.In summary, the unit characteristics that were found to be Antecedents to ET were the sub-composites of Team and Complexity. Proxy variables, Collaborative Culture Agility and Experiential Agility, were successfully formed as a composite for WFA and were tested with the primary data. No mediators or moderators were shown; however, main effects of WFA and ET did have an impact on patient outcomes.
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4

Wall, Dylan Joseph. "Anisotropic Turbulence Models for Wakes in an Active Ocean Environment." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/104162.

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A set of second-moment closure turbulence models are implemented for the study of wake evolution in an oceanic environment. The effects of density stratification are considered, and the models are validated against laboratory experiments mimicking the stratified ocean environment, and against previous experimental study of wakes subjected to a density stratification. The turbulence models are found to reproduce a number of important behaviors which differentiate stratified wakes from those in a homogeneous environment, including the appropriate decay rates in turbulence quantities, buoyant suppression of turbulence length scales, and canonical stages in wake evolution. The existence of background turbulence is considered both through the introduction of production terms to the turbulence model equations and the replication of scale-resolved simulations of wakes embedded in turbulence. It is found that the freestream turbulence causes accelerated wake growth and faster decay of wake momentum. Wakes are then simulated at a variety of Re and Fr representative of full-scale vehicles operating in an ocean environment, to downstream distances several orders of magnitude greater than existing RANS studies. The models are used to make some general predictions concerning the dependence of late-wake behavior on these parameters, and specific insights into expected behavior are gained. The wake turbulence is classified using "fossil turbulence" and stratification strength criteria from the literature. In keeping with experimentally observed behavior, the stratification is predicted to increase wake persistence. It is also predicted that, regardless of initial Re or F r, the wake turbulence quickly becomes a mixture of overturning eddies and internal waves. It is found that the high Re wakes eventually become strongly affected by the stratification, and enter the strongly-stratified or LAST regime. Additional model improvements are proposed based on the predicted late wake behavior.
Doctor of Philosophy
A set of advanced turbulence models are implemented and used to study ship wakes in an oceanic environment. The flows in the ocean are subject to a density stratification due to changes in temperature and salinity; the associated effects are included in the turbulence models. The models are validated against laboratory experiments mimicking the stratified ocean environment, and against previous experimental study of wakes subjected to a density stratification. The turbulence models are found to reproduce a number of important behaviors expected under such conditions based on experimental study. Additional modifications are made to the models to include the effect of pre-existing freestream turbulence. Wakes are then simulated under conditions representative of full-scale vehicles operating in an ocean environment. The models are used to make some general predictions concerning late-wake behavior. Specific insights into expected behavior are gained. The wake turbulence is classified using ``fossil turbulence'' and stratification strength criteria from the literature. In keeping with experimentally observed behavior, the stratification is predicted to increase wake persistence. Additional model improvements are proposed based on the predicted late wake behavior.
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5

Choksi, Kashyap Nalin. "A Strategic Approach to Managing Turbulence in the Normative Environment." Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/29508.

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Анотація:
One of the central areas of focus in organizational theory that has been of particular interest is the organization-environment interface. While various theories have made vital contributions to the study of organization-environment relations, their emphasis on organization adaptation is varied. However, research and practice have amply demonstrated that organizations do not exist in a vacuum; that if an organization is to survive and meet its goals, it has to adapt to or somehow make accommodations with its cognitive and normative environment. This study explores the issue of an organization trying to adapt to its normative environment by deeply examining the situation of a national private nonprofit organization, with ties to the land-grant university and college system, which found itself in the midst of a turbulent environment. Specifically, the study discusses how that nonprofit was affected by this turbulence when it accepted funding from the nation's largest tobacco company to develop and implement a tobacco prevention program. The act of this nonprofit accepting funds from the tobacco corporation caused challenges in internal management, worsened relations with some of its core constituencies, and fomented discord within leading non-profit organizations. The notion of turbulence, the mechanism of isomorphism as espoused by the new institutionalists, and the role of agency was explored, supplemented by a strategic approach that included components of contracting standards that organizations could adapt to attain congruency with elements of their turbulent normative environment. In particular, this strategic approach utilized a framework borrowed from research conducted by Oliver (1991), emphasizing strategies of Defiance, Manipulation and Avoidance. What this study offers is a strategic approach to help non-profit organizations when they partner with a controversial source of funding, especially in cases where they are faced with these kinds of management dilemmas.
Ph. D.
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6

Genin, Franklin Marie. "Study of compressible turbulent flows in supersonic environment by large-eddy simulation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28085.

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Анотація:
Thesis (M. S.)--Aerospace Engineering, Georgia Institute of Technology, 2009.
Committee Chair: Menon, Suresh; Committee Member: Ruffin, Stephen; Committee Member: Sankar, Lakshmi; Committee Member: Seitzman, Jerry; Committee Member: Stoesser, Thorsten
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7

Cerda, Rodrigo Andrés Miranda. "Synchronization in intermittent turbulence and spatiotemporal chaos in the solar-terrestrial environment." Instituto Nacional de Pesquisas Espaciais, 2010. http://urlib.net/sid.inpe.br/mtc-m19@80/2010/04.29.12.38.

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Neste trabalho de Tese analisamos a sincronização devido a interações entre escalas em observações de turbulência intermitente e em simulações numéricas de intermitência espaço-temporal em fluidos neutros e plasmas espaciais. Este estudo é feito em duas partes. Primeiro, aplicamos duas técnicas não-lineares, curtose e índice de coerência de fase, para medir o grau de não-Gaussianidade e sincronização de fase da turbulência de campo magnético intermitente observada no vento solar, na fotosfera solar e no solo, e da turbulência atmosférica intermitente observada na copa da floresta Amazônica. Depois, analisamos um modelo espacialmente estendido de ondas não-lineares em fluidos e plasmas para identificar estruturas coerentes transientes, responsáveis pela intermitência \texteit{on-off} espaço-temporal observada nas séries temporais da energia. Quantificamos o grau de sincronização de amplitude e fase usando a entropia espectral de potência e de fase no regime logo depois da transição para caos espaço-temporal. Os resultados observacionais e teóricos indicam que a sincronízação de amplitude e fase pode ser a origem da intermitência na turbulência completamente desenvolvida no ambiente solar-terrestre.
In this work we analyze synchronization due to multiscale interactions in observations of intermittent turbulence and numerical simulations of spatiotemporal intermittency in neutral fluids and space plasmas. This study is carried out in two parts. First, we apply two distinct nonlinear techniques, kurtosis and phase coherence index, to measure the degree of non-Gaussianity and phase synchronization of intermittent magnetic field turbulence observed in the ambient solar wind, in the solar photosphere and in the ground, and intermittent atmospheric turbulence observed in the Amazon rain forest canopy. Next, we analyze a spatially-extended model of nonlinear waves in fluids and plasmas to identify transient coherent structures responsible for the on-off spatiotemporal intermittency observed in the time series of energy. We quantify the degree of amplitude-phase synchronization using the power-phase spectral entropy at the onset of spatiotemporal chaos. The observational and theoretical results indicate that the amplitude-phase Synchronization may be the origin of intermittency in fully-developed turbulence in the solar-terrestrial environment.
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8

Elge, Murat. "Langmuir circulations in a coastal environment during CBLAST." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Sept%5FElge.pdf.

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Анотація:
Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, Sept. 2004.
Thesis advisor(s): Timothy P. Stanton. Includes bibliographical references (p. 95-99). Also available online.
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9

Hillary, Richard Matthew. "Effects of turbulence and a patchy environment on the dynamics of plankton populations." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/843526/.

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Анотація:
The main aim of this project has been to investigate how turbulence and a patchy environment can affect the dynamics of plankton. In the first chapter, a brief introduction to the subject, both the methods and models we use and some of their behaviour in relation to observed phenomena, is given. In the second chapter, a reduced model for Langmuir circulations is used as a paradigm for chaotic advection of planktonic species. The patchiness of plankton due to such advection is discussed along with the effects of swimming/turbulent diffusion and how we can sometimes gain an analytical hold on the transport of organisms, using Melnikov analysis, in certain flows and we extend the results of previous work in this area. In Chapter 3, the possibility of pattern formation of swimming, spheroidal organisms in a simple, steady shear flow is investigated. In Chapter 4, the effects of turbulence and any inertial effects (buoyancy or density differences) is considered with regard to the initiation and subsequent propagation of phytoplankton blooms. The effect of a patchy environment is studied first, in Chapter 5, for the situation where we know explicitly the dynamics of the plankton. We take a spatially discrete, coupled oscillator approach to the patchy dynamics of plankton. The case where the dynamics of the patches is not known and, consequently all we might have is time series data is studied in Chapter 6. Given only measurements of the dynamics of some patchy population, we present a way of trying to deal with the patchy data in a more rigorous framework as mention of the inherently heterogeneous environments being measured is made but is mostly ignored. A method of first distinguishing independent patch dynamics from deterministically related dynamics is presented based on the algorithm first seen in Pecora et al. Given this deterministic bond between the patches we then set about creating a meta-population time series representing the collective dynamics of the population. This new time series is constructed so as to try and preserve as much of the individual dynamics as possible. Using a non-linear prediction algorithm ideally suited to possibly short data sets, we suggest this new time series can be used to improve short term predictions of general trends in the dynamics and also for the purposes of model fitting. Particular attention is given to using algorithms that can be applied to relatively short data sets, often a problem in studying time series data of ecosystems.
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10

Rivas, David Roy. "Theory and simulation of electrostatic wave turbulence in the space shuttle-induced plasma environment." Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/49593.

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Книги з теми "Turbulence of the environment"

1

Fredericks, J. J. Turbulence in the coastal environment during HYCODE. Woods Hole, Mass: WHOI, 2004.

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2

Fredericks, J. J. Turbulence in the shallow nearshore environment during Sandy Duck '97. Woods Hole, Mass: Woods Hole Oceanographic Institution, 2001.

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3

R, Hunt J. C., and Institute of Mathematics and Its Applications., eds. Turbulence and diffusion in stable environments: Based on the proceedings of a conference on Modelsof Turbulence and Diffusion in Stably Stratified Regions of the Natural Environment organized by the Institute of Mathematics and its Applications and held in Cambridge, March 1983. Oxford: Clarendon, 1985.

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4

Launder, B. E. (Brian Edward), ed. Modelling turbulence in engineering and the environment: Second-moment routes to closure. Cambridge: Cambridge University Press, 2011.

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5

Fredriksson, Per. Trade integration and political turbulence: Environmental policy consequences. [Washington, D.C.]: International Monetary Fund, Fiscal Affairs Department, 2001.

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6

service), SpringerLink (Online, ed. Plasma Turbulence in the Solar System. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

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7

Chan, T. S., and Geng Cui, eds. Asian Businesses in a Turbulent Environment. London: Palgrave Macmillan UK, 2016. http://dx.doi.org/10.1057/978-1-137-48887-9.

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8

Blackadar, Alfred K. Turbulence and diffusion in the atmosphere: Lectures in environmental sciences. Berlin: Springer, 1997.

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9

K, Blackadar Alfred. Turbulence and Diffusion in the Atmosphere: Lectures in Environmental Sciences. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997.

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10

Komori, Satoru. Turbulence structure and CO₂ transfer at the air-sea interface and turbulent diffusion in thermally-stratified flows. Tsukuba, Japan: Center for Global Environmental Research, National Institute for Environmental Studies, Environment Agency of Japan, 1996.

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Частини книг з теми "Turbulence of the environment"

1

Kaplan, Michael L. "Multi-scale Observational and Numerical Modeling Studies of the Turbulence Environment." In Aviation Turbulence, 299–316. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23630-8_15.

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2

Kolditz, Olaf. "Turbulence." In Computational Methods in Environmental Fluid Mechanics, 29–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04761-3_2.

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3

Santanu De and Swetaprovo Chaudhuri. "Mechanics and Modelling of Turbulence–Combustion Interaction." In Energy, Environment, and Sustainability, 3–43. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7410-3_1.

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4

Chian, A. C. L., F. A. Borotto, E. L. Rempel, E. E. N. Macau, R. R. Rosa, and F. Christiansen. "Dynamical Systems Approach to Space Environment Turbulence." In Advances in Space Environment Research - Volume I, 447–61. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1069-6_44.

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Rizzato, F. B., A. C. L. Chian, M. V. Alves, R. Erichsen, S. R. Lopes, G. I. Oliveira, R. Pakter, and E. L. Rempel. "Langmuir Turbulence and Solar Radio Bursts." In Advances in Space Environment Research - Volume I, 507–14. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-007-1069-6_51.

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Shen, X., and Z. Warhaft. "Is High Reynolds Number Turbulence Locally Isotropic?" In Fluid Mechanics and the Environment: Dynamical Approaches, 285–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-44512-9_15.

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7

Ansoff, H. Igor. "Model of Environmental Turbulence." In Strategic Management, 55–79. London: Palgrave Macmillan UK, 2007. http://dx.doi.org/10.1057/9780230590601_6.

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Franca, Mário J., and Maurizio Brocchini. "Turbulence in Rivers." In Rivers – Physical, Fluvial and Environmental Processes, 51–78. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17719-9_2.

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9

Wong, Alfred, Dean Tjosvold, and Eva Khong. "Respectful Leadership for Managing Conflict to Cope with Market Turbulence." In Asian Businesses in a Turbulent Environment, 41–62. London: Palgrave Macmillan UK, 2016. http://dx.doi.org/10.1057/978-1-137-48887-9_3.

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Zhai, Zhiqiang (John). "Select Turbulence Modeling Method." In Computational Fluid Dynamics for Built and Natural Environments, 83–114. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9820-0_4.

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Тези доповідей конференцій з теми "Turbulence of the environment"

1

Zhang, Siqi, Rongxin Cui, and Demin Xu. "Swarm olfactory search in turbulence environment." In 2014 International Conference on Multisensor Fusion and Information Integration for Intelligent Systems (MFI). IEEE, 2014. http://dx.doi.org/10.1109/mfi.2014.6997701.

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2

Monin, D. John, and Philip J. Dewe. "Skills in an environment of turbulence." In the 1994 computer personnel research conference. New York, New York, USA: ACM Press, 1994. http://dx.doi.org/10.1145/186281.186325.

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3

WORLEY, G., and W. FROST. "Winds, turbulence, and diffusion at SLC-6." In Shuttle Environment and Operations II Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-7043.

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4

Cai, Xiping, Li Ding, Jianbo Liu, Libao Liu, and Kexiang Zhang. "Effect of atmospheric turbulence on laser radar." In Third International Asia-Pacific Environmental Remote Sensing Remote Sensing of the Atmosphere, Ocean, Environment, and Space, edited by Upendra N. Singh, Toshikasu Itabe, and Zhishen Liu. SPIE, 2003. http://dx.doi.org/10.1117/12.466082.

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5

Hou, Weilin, and Silvia Matt. "EO signal propagation in a simulated underwater turbulence environment." In OCEANS 2014 - TAIPEI. IEEE, 2014. http://dx.doi.org/10.1109/oceans-taipei.2014.6964293.

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6

Sytsma, Michael, and Larry Ukeiley. "Low Order Turbulence Modeling Methods for MAVs Flight Environment." In AIAA Atmospheric Flight Mechanics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-7935.

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Hammel, Steve, and Daniel Kichura. "Turbulence effects on laser propagation in a marine environment." In Optical Engineering + Applications, edited by Stephen M. Hammel, Alexander M. J. van Eijk, and Mikhail A. Vorontsov. SPIE, 2008. http://dx.doi.org/10.1117/12.798767.

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Hammel, Steve. "Turbulence effects on laser propagation in a marine environment." In Optical Engineering + Applications, edited by Stephen M. Hammel, Alexander M. J. van Eijk, Michael T. Valley, and Mikhail A. Vorontsov. SPIE, 2007. http://dx.doi.org/10.1117/12.735906.

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Hu, Qiang, Xianzhi Ao, R. Peltzer, and Gary P. Zank. "Turbulence properties associated with interplanetary shock waves." In SPACE WEATHER: THE SPACE RADIATION ENVIRONMENT: 11th Annual International Astrophysics Conference. AIP, 2012. http://dx.doi.org/10.1063/1.4768765.

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Lhermitte, R. "Water velocity and turbulence measurements by pulse coherent doppler sonar." In OCEANS '85 - Ocean Engineering and the Environment. IEEE, 1985. http://dx.doi.org/10.1109/oceans.1985.1160166.

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Звіти організацій з теми "Turbulence of the environment"

1

Trowbridge, John, and W. R. Geyer. Quantifying Turbulence in the Coastal Environment. Fort Belvoir, VA: Defense Technical Information Center, August 2008. http://dx.doi.org/10.21236/ada486658.

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2

Trowbridge, John, and W. R. Geyer. Quantifying Turbulence in the Coastal Environment. Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada573278.

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3

Onishi, Y., D. C. Dummuller, D. S. Trent, Washington State Univ., Pullman, WA (USA), and Pacific Northwest Lab., Richland, WA (USA)). Preliminary testing of turbulence and radionuclide transport modeling in deep ocean environment. Office of Scientific and Technical Information (OSTI), March 1989. http://dx.doi.org/10.2172/5624007.

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4

Ames, Forrest, and Jeffrey Bons. Cooling Strategies for Vane Leading Edges in a Syngas Environment Including Effects of Deposition and Turbulence. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1172298.

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5

Chang, Thomas T. Multiscale, Intermittent, Turbulent Fluctuations in Space Plasmas and Their Influence on the Interscale Behavior of the Space Environment. Fort Belvoir, VA: Defense Technical Information Center, June 2012. http://dx.doi.org/10.21236/ada564380.

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6

Sreenivasan, K. R. Turbulence, Turbulence Control, and Drag Reduction. Fort Belvoir, VA: Defense Technical Information Center, August 1987. http://dx.doi.org/10.21236/ada185643.

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7

Sreenivasan, K. R. Studies in Turbulence and Turbulence Control. Fort Belvoir, VA: Defense Technical Information Center, June 1993. http://dx.doi.org/10.21236/ada266318.

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8

Ayoul-Guilmard, Q., F. Nobile, S. Ganesh, M. Nuñez, R. Tosi, C. Soriano, and R. Rosi. D5.5 Report on the application of multi-level Monte Carlo to wind engineering. Scipedia, 2022. http://dx.doi.org/10.23967/exaqute.2022.3.03.

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Анотація:
We study the use of multi-level Monte Carlo methods for wind engineering. This report brings together methodological research on uncertainty quantification and work on target applications of the ExaQUte project in wind and civil engineering. First, a multi-level Monte Carlo for the estimation of the conditional value at risk and an adaptive algorithm are presented. Their reliability and performance are shown on the time-average of a non-linear oscillator and on the lift coefficient of an airfoil, with both preset and adaptively refined meshes. Then, we propose an adaptive multi-fidelity Monte Carlo algorithm for turbulent fluid flows where multilevel Monte Carlo methods were found to be inefficient. Its efficiency is studied and demonstrated on the benchmark problem of quantifying the uncertainty on the drag force of a tall building under random turbulent wind conditions. All numerical experiments showcase the open-source software stack of the ExaQUte project for large-scale computing in a distributed environment.
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9

Laganelli, A. L., and S. M. Dash. Turbulence Modeling. Fort Belvoir, VA: Defense Technical Information Center, October 1991. http://dx.doi.org/10.21236/ada415956.

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10

Horton, W., and G. Hu. Plasma turbulence. Office of Scientific and Technical Information (OSTI), July 1998. http://dx.doi.org/10.2172/661635.

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