Tesi: "The Tides Of Time"

1

Li, Tak-wai Wilson. "Forecasting of tide heights : an application of smoothness priors in time series modelling /". [Hong Kong] : University of Hong Kong, 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13154357.

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2

Li, Tak-wai Wilson, e 李德煒. "Forecasting of tide heights: an application of smoothness priors in time series modelling". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B3121048X.

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3

Coughenour, Christopher Lynn Lacovara Kenneth J. "An analysis of cyclic tidal deposits : statistical time series properties, extraction of earth-moon parameters, and observed intertidal sedimentation /". Philadelphia, Pa. : Drexel University, 2009. http://hdl.handle.net/1860/3135.

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4

Wai, Siu-wah. "Red tides : a detrimentall threat to the environment /". Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20038203.

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5

Kemp, Kirsty M. "Temporal dynamics in the deep sea : time-series at food falls, seasonality in condition of grenadiers, and tides as time signals". Thesis, University of Aberdeen, 2006. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU222698.

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Abstract (sommario):

The deep demersal community of the bathyal Porcupine Seabight is subject to environmental forcing on diel, seasonal and annual scales, in addition to the stochastic and transient influence of nutritional windfalls from the photic zone. The current regime at bathyal depth in the Porcupine Seabight is characterised by oscillations in current flow with periods of 12.4h and 14.8d. Increased current velocity and particle suspension in summer months synchronises well with the seasonal input of phytoplankton to the seafloor. These physical characteristics may constitute time signals in the deep ocean environment. Consumption and succession processes at bathyal food falls in the North Atlantic are suggestive of a fundamental difference in the community response between the North Atlantic and North Pacific oceans. The sinking of small cetacean carcasses constitutes a transient environmental impact on the local community structure which is not limited to the scavenging fauna. There is limited evidence of a response to the seasonal increase in available organic carbon in the white muscle of North Atlantic macrourids. This is in accordance with results from Pacific macrourids and suggests that the seasonal food pulse, experienced by the deep benthos under productive surface waters, is not greatly manifested at higher trophic levels. The successful adaptation of existing baited camera technology to incorporate an autonomous periodic bait-release system has enabled long-term high frequency time-series observations of deep-sea scavenging demersal fish and crustaceans to be made for the first time. An understanding of temporal environmental cues, and of the resultant interactions between organisms and their environment, effectively pervades the study of any aspect of organismal or population ecology.

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6

Devlin, Adam Thomas. "On the variability of Pacific Ocean tides at seasonal to decadal time scales| Observed vs modelled". Thesis, Portland State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128376.

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Ocean tides worldwide have exhibited secular changes in the past century, simultaneous with a global secular rise in mean sea level (MSL). The combination of these two factors contributes to higher water levels, and may increase threats to coastal regions and populations over the next century. Equally as important as these long-term changes are the short-term fluctuations in sea levels and tidal properties. These fluctuations may interact to yield locally extreme water level events, especially when combined with storm surge. This study, presented in three parts, examines the relationships between tidal anomalies and MSL anomalies on yearly and monthly timescales, with a goal of diagnosing dynamical factors that may influence the long-term evolution of tides in the Pacific Ocean. Correlations between yearly averaged properties are denoted tidal anomaly trends (TATs), and will be used to explore interannual behavior. Correlations of monthly averaged properties are denoted seasonal tidal anomaly trends (STATs), and are used to examine seasonal behavior. Four tidal constituents are analyzed: the two largest semidiurnal (twice daily) constituents, M2 and S2, and the two largest diurnal (once daily) constituents, K1 and O1.

Part I surveys TATs and STATs at 153 Pacific Ocean tide gauges, and discusses regional patterns within the entire Pacific Ocean. TATs with statistically significant relations between MSL and amplitudes (A-TATs) are seen at 89% of all gauges; 92 gauges for M2, 66 for S2, 82 for K1, and 59 for O1. TATs with statistically significant relations between tidal phase (the relative timing of high water of the tide) and MSL (P-TATs) are observed at 55 gauges for M2, 47 for S2, 42 for K1, and 61 for O1. Significant seasonal variations (STATs) are observed at about a third of all gauges, with the largest concentration in Southeast Asia. The effect of combined A-TATs was also considered. At selected stations, observed tidal sensitivity with MSL was extrapolated forward in time to the predicted sea level in 2100. Results suggest that stations with large positive combined A-TATs produce total water levels that are greater than those predicted by an increase in MSL alone, increasing the chances of high-water events.

Part II examines the mechanisms behind the yearly (TAT) variability in the Western Tropical Pacific Ocean. Significant amplitude TATs are found at more than half of 26 gauges for each of the two strongest tidal constituents, K1 (diurnal) and M2 (semidiurnal). For the lesser constituents analyzed (O1 and S2), significant trends are observed at ten gauges.

Part III analyzes the seasonal behavior of tides (STATs) at twenty tide gauges in the Southeast Asian waters, which exhibit variation by 10 – 30% of mean tidal amplitudes. A barotropic ocean tide model that considers the seasonal effects of MSL, stratification, and geostrophic and Ekman velocity is used to explain the observed seasonal variability in tides due to variations in monsoon-influenced climate forcing, with successful results at about half of all gauges. The observed changes in tides are best explained by the influence of non-tidal velocities (geostrophic and Ekman), though the effect of changing stratification is also an important secondary causative mechanism.

From the results of these surveys and investigations, it is concluded that short-term fluctuations in MSL and tidal properties at multiple time scales may be as important in determining the state of future water levels as the long-term trends. Global explanations for the observed tidal behavior have not been found in this study; however, significant regional explanations are found at the yearly time scale in the Solomon Sea, and at the seasonal time scale in Southeast Asia. It is likely that tidal sensitivity to annual and seasonal variations in MSL at other locations also are driven by locally specific processes, rather than factors with basin-wide coherence. (Abstract shortened by ProQuest.)

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7

Geißler, Christoph, e Ch Jacobi. "Forcing of the Quarterdiurnal Tide". Universität Leipzig, 2018. https://ul.qucosa.de/id/qucosa%3A31792.

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Ensemble calculations for the period from 2000 to 2010 were carried out with the middle and upper atmosphere model (MUAM), and an analysis of the quarterdiurnal tide is performed. The global temporal and latitudinal distributions of the quarterdiurnal tide are modeled with MUAM, and their forcing mechanisms are examined. The quarterdiurnal tides show a similar distribution over the year in the northern and southern hemisphere, with maxima of the amplitude in late winter and spring as well as in autumn. In the latitude-height distribution is also shown that the largest amplitudes of the quarterdiurnal tide are seen at midlatitudes. Due to the decreasing density with height, there is a general increase of the tidal amplitudes with height. The results of the forcing analyses show that direct solar forcing is most important, but also that non-linear forcing and gravity wave interaction with other tides have a non-negligible influence on the quarterdiurnal tide in the middle and upper atmosphere.
Mit dem Modell für die mittlere und obere Atmosphäre MUAM wurden Ensemble-Berechnungen für den Zeitraum 2000 bis 2010 durchgeführt und die vierteltägigen Gezeiten analysiert. Es wird auf die globale zeitliche und räumliche Verteilung der vierteltägigen Gezeiten eingegangen und deren Anregungsmechanismen untersucht. Die vierteltägigen Gezeiten zeigen einen ähnlichen Verlauf über das Jahr auf der Nord- und Südhalbkugel mit Maxima der Amplitude im späten Winter und Frühjahr sowie im Herbst. Ein ähnliches Bild zeigt sich auch für die Verteilung im Breiten-Höhen-Schnitt, wo die größten Amplituden der vierteltätigen Gezeiten in den mittleren Breiten zu finden sind. Aufgrund der abnehmenden Dichte mit der Höhe ist eine allgemeine Zunahme der Amplituden mit der Höhe zu beobachten. Es zeigte sich, dass der direkte solare Antrieb am stärksten ausgeprägt ist, aber auch, dass der nichtlinearer Antrieb und die Interaktion von Schwerewellen mit anderen Gezeiten einen nicht zu vernachlässigenden Einfluss auf die vierteltägigen Gezeiten in der mittleren und oberen Atmosphäre haben.

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8

Haselmaier, Lawrence H. "Computation of a Virtual Tide Corrector to Support Vertical Adjustment of Autonomous Underwater Vehicle Multibeam Sonar Data". ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2080.

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One challenge for Autonomous Underwater Vehicle (AUV) multibeam surveying is the limited ability to assess internal vertical agreement rapidly and reliably. Applying an external ellipsoid reference to AUV multibeam data would allow for field comparisons. A method is established to merge ellipsoid height (EH) data collected by a surface vessel in close proximity to the AUV. The method is demonstrated over multiple collection missions in two separate areas. Virtual tide corrector values are derived using EH data collected by a boat and a measured ellipsoid to chart datum separation distance. Those values are compared to measurements by a traditional tide gauge installed nearby. Results from the method had a mean difference of 6 centimeters with respect to conventional data and had a mean total propagated uncertainty of 15 centimeters at the 95% confidence interval. Methodologies are examined to characterize their accuracies and uncertainty contribution to overall vertical correction.

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9

Ho, Kin-chung. "Subtropical red tides and their ecological significance in Hong Kong waters /". [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12997213.

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10

Wai, Siu-wah, e 衛兆華. "Red tides: a detrimentall threat to the environment". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31254135.

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11

Langkau, Katharina. "Flows over time with flow dependent transit times". [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968912656.

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12

Park, Chang Yun. "Predicting deterministic execution times of real-time programs /". Thesis, Connect to this title online; UW restricted, 1992. http://hdl.handle.net/1773/6978.

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13

Ho, Kin-chung, e 何建宗. "Subtropical red tides and their ecological significance in Hong Kong waters". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B3123222X.

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14

Webb, Anthony James. "The propagation of the internal tide around a bend in Knight Inlet, B.C". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25997.

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This thesis seeks to answer the question "how much of the internal tide propagating up Knight Inlet, B.C. is reflected by a right-angled bend ?" The internal tide in Knight Inlet is generated by the interaction of the barotropic tide with a shallow sill seaward of the bend. It then propagates in both directions as a travelling Kelvin wave. The up-inlet propagating wave then encounters the bend, where some of it may be reflected. This question is looked at with both theory (Chapter 2) and observations (Chapter 3). The theoretical study investigates the propagation of a Kelvin wave around a bend in a channel. The solution of the linearised long wave equations is expressed as a truncated series of cross-channel modes in each of three regions. The solution is matched across the two common boundaries by a least squares point matching process. The "rectangular bend" gives unsatisfactory results because of a singularity in the velocity field at the sharp inside corner. However, the "annular bend" gives good results. The bend acts as a diffraction grating, with total transmission for certain bend angles and "lobes" of high reflection for intermediate angles. Bends to the left give rise to the same reflection as bends to the right of the same angle, even if the incident Kelvin wave has a small cross-channel decay scale. For the parameters corresponding to the M₂ internal tide in Knight Inlet, the energy flux reflection coefficient is very small, much less than 1%. The method of solution breaks down inexplicably for diurnal tides. The observational study is based upon 2⅓ months of cyclesonde current meter data from four stations in Knight Inlet taken during the summers of 1981 and 1983. The vertical profiles of amplitude and phase of the M₂ constituent of longitudinal velocity and density fluctuations are found to be the same from month to month at a particular station, but different from station to station. These complex amplitude profiles are decomposed into a truncated series of normal modes for waves propagating both up-inlet and down-inlet. The phase speeds and zero-crossing depths of the normal modes do not agree with those calculated by Farmer and Smith (1980a) using 1977 data. Two simple models of the stratification are used to explain the differences in the normal modes in terms of differences in the Brunt-Väisälä frequency profile used to calculate them. At the two stations up-inlet of the sill, acceptable fits can be obtained using only two up-inlet propagating waves, indicating that the data are compatible with the low reflection found in the theoretical study. When down-inlet waves are included in the fit, their amplitudes are found to be small, although care must be taken to avoid trying to fit too many modes since some of them are highly correlated in the depth range for which data are available. At the two stations seaward of the sill, the up-inlet energy flux is of the same order of magnitude as the down-inlet flux, indicating a second source of internal tide seaward of those two stations. The results indicate that only 30-50% of the power removed from the barotropic tide is being fed into the internal tide in the summer. This conclusion is at variance with that of Stacey (1985), whose model shows that most of the power lost from the barotropic tide is being fed into the internal tide. A consistent interpretation of these results is that most of the power lost from the barotropic tide initially goes into the internal tide, but that 50-70% of it is rapidly dissipated through turbulence within a couple of kilometers of the sill. The low frequency component of the velocity signals from the cyclesonde data is also presented (Chapter 4), with a brief analysis . The monthly averaged residual velocity profiles are also found to be fairly repeatable from month to month at a particular station, but different from station to station. These profiles could be useful in validating general circulation models.
Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate

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15

Ferron, David Joseph. "Time and tide, harbouring place in Seal Cove". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ39652.pdf.

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16

Lundkvist, Henrik. "Robust Vehicle Routing in an Urban Setting". Thesis, KTH, Optimeringslära och systemteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186248.

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In this thesis, the vehicle routing problem with stochastic, and time dependent, travel times is studied. The stochastic travel times are estimated from historical drive data. The variation of the drive times, as well as that of the variance, during the day was modeled. The purpose of the thesis was to propose a method of handling the congestion related traffic impediments in an urban setting. Since the majority of times of delivery in the empirical test cases studied correlate with the time period of high traffic load, an efficient and robust handling of such traffic scenarios is of high importance. It is shown that the stochastic models will shift the estimated arrivals to customers from the more volatile early and late extremes to more central regions of the time window. Previously delivered routes were evaluated both with the standard algorithm and the proposed stochastic algorithm. The difference between the actual drive times and the calculated drive times were analyzed by studying the correlation of the drive times between each customer in the route. It was shown that the routes of the proposed stochastic method increased this correlation. The drive times between nodes where also perturbed with a Gamma distributed noise. The results from the stochastic algorithm showed higher resilience to this disturbance than did the deterministic models.
I detta examensarbete har fordonsruttningsproblemet, VRP, med stokastiska och tidsberonds körtider behandlöats. De stokastiska körtiderna har estimerats från tidigare insamlad hasighetsdata. Modeller för körtidernas och variansernas förändring under dagen har tagits fram. Syftet med examensarbetet var att föreslå en metod för hur påverkan på körtider av förutsägbar trafikträngsel i en urban trafikmiljö kan hanteras. Eftersom huvuddelen av alla leveranser sammanfaller med de tider på dygnet då trafikbelastning är som högst, ar är en effektiv och robust metod för att hantera sådana störningar av stor vikt. Det visas att den stokastiska modellen kommer att förflyttar ankomster från början och slutet av tidsfönstret till den mer okänsliga mittregionen. Tidigare, utförda leveranser studerades både med den ursprungliga deterministiska modellen och här framtagna stokastiska modellen. Skillnaden mellan de två analyserades genom att studera korrelationen mellan körtiderna som de beräknats av de två modellerna och de upmätta tiderna som de loggats av leveransfordonen. Det visas att korrelationen mellan körtiderna mellan de stokastiska körtiderna och de verkliga körtiderna är högre än korrelationen mellan de deterministiska körtiderna och de verkliga. Rutterna som föreslagits av den stokastiska modellen var också mer tlig mot störningar.

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17

Jönsson, Andreas. "The Importance of Time in Charles Dickens' Hard Times". Thesis, Högskolan i Gävle, Institutionen för humaniora och samhällsvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-4017.

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The purpose of the essay is to illustrate the differences in understanding and comprehension of time among the characters in the novel Hard Times. These contrasting differences are then argued to compose a crtisism of the industrial society.

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18

Martinoty, Laurine. "Intrahousehold Allocation of Time and Consumption during Hard Times". Thesis, Lyon, École normale supérieure, 2015. http://www.theses.fr/2015ENSL1021/document.

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Les conséquences des chocs économiques négatifs sur les ménages ont été documentés extensivement, mais on en sait beaucoup moins sur la manière dont ces chocs sont transmis aux individus à travers la médiation du ménage. Le ménage contribue-il à modérer l'effet des chocs négatifs ? Dans quelle mesure le choc économique pèse-t-il dans la négociation familiale ? À partir de données sur la crise économique argentine de 2001, je montre d'abord que les femmes en couple ont une plus grande probabilité de devenir actives si leur mari a fait l'expérience d'un choc de revenu. Ensuite, je montre que le cycle économique importe dans les décisions d'investissement en capital humain. Sur le long terme, les profils de salaire et d'employabilité des hommes argentins sont affectés de manière persistante par les conditions économiques initiales au moment de l'obtention du diplôme. Enfin, je considère la dimension “man-cession” de la crise économique de 2009 en Espagne et montre que la part des ressources du ménage reçues par les femmes pour leur consommation privée augmente avec la diminution de l'écart des taux de chômage hommes-femmes, confortant l'hypothèse que les chocs négatifs modifient le pouvoir de négociation des individus au sein du ménage
The consequences of adverse aggregate shocks on households have been repeatedly documented, but far less has been said on the way they are passed over to individuals through the mediation of the household. Does the household contribute in mitigating the effects? Or does the economic shock rather invite itself at the family negociating table? Using the Argentine 2001 economic crisis as a natural experiment, I first show that married women are more likely to enter the labor market if their husband experienced a loss in income, giving credit to the insurance mechanism. Then, I show that the business cycle matters for investments in education, and that long run labor outcomes of Argentine men are persistently affected by the initial conditions upon graduation. Finally, I consider the “Mancession” dimension of the Great Recession in Spain and demonstrate that the resource share accruing to wives for own consumption increases together with the decreasing unemployment gap, which comes in support to the bargaining hypothesis

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19

Stupak, Noah. "Time-delays and system response times in human-computer interaction /". Online version of thesis, 2009. http://hdl.handle.net/1850/10867.

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20

Fröhlich, Kristina, Alexander Pogoreltsev e Christoph Jacobi. "Tides, Rossby and Kelvin waves simulated with the COMMA-LIM Model". Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-217759.

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A 48-layer version of the COMMA-LIM (Cologne Model of the Middle Atmosphere – Leipzig Institute for Meteorology) three-dimensional global mechanistic model of the Earth\'s atmosphere from 0 km to 135 km with logarithmic pressure height coordinates was developed. The model is capable of reproducing the global structures and propagation of different planetary waves in the middle atmosphere. The contribution of gravity waves, tides, Rossby and Kelvin waves into the zonally averaged momentum budget of the mesosphere / lower thermosphere region has been investigated
Eine neue Version des COMMA-LIM (Cologne Model of the Middle Atmosphere – Leipzig Institute for Meteorology) wurde im Zusammenhang mit der Erhöhung der vertikalen Schichtauflösung entwickelt. Das COMMA ist ein dreidimensionales globales mechanistisches Modell der Erdatmosphäre mit einer Ausdehnung von ca. 0 – 135 km in logarithmischen Druckkoordinaten. Damit können globale Eigenschaften der mittleren Atmosphäre sowie die Ausbreitung verschiedener planetarer Wellen nachvollzogen werden. Die Beiträge der Schwerewellen, thermischer Gezeiten, Rossby und Kelvin Wellen zur zonal gemitteltem Impulsbalance der Mesosphäre und unteren Thermosphäre wurden untersucht

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21

Fröhlich, Kristina, Alexander Pogoreltsev e Christoph Jacobi. "Tides, Rossby and Kelvin waves simulated with the COMMA-LIM Model". Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 30 = Meteorologische Arbeiten aus Leipzig ; 8 (2003), S. 149-156, 2003. https://ul.qucosa.de/id/qucosa%3A15248.

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Abstract (sommario):

A 48-layer version of the COMMA-LIM (Cologne Model of the Middle Atmosphere – Leipzig Institute for Meteorology) three-dimensional global mechanistic model of the Earth\''s atmosphere from 0 km to 135 km with logarithmic pressure height coordinates was developed. The model is capable of reproducing the global structures and propagation of different planetary waves in the middle atmosphere. The contribution of gravity waves, tides, Rossby and Kelvin waves into the zonally averaged momentum budget of the mesosphere / lower thermosphere region has been investigated.
Eine neue Version des COMMA-LIM (Cologne Model of the Middle Atmosphere – Leipzig Institute for Meteorology) wurde im Zusammenhang mit der Erhöhung der vertikalen Schichtauflösung entwickelt. Das COMMA ist ein dreidimensionales globales mechanistisches Modell der Erdatmosphäre mit einer Ausdehnung von ca. 0 – 135 km in logarithmischen Druckkoordinaten. Damit können globale Eigenschaften der mittleren Atmosphäre sowie die Ausbreitung verschiedener planetarer Wellen nachvollzogen werden. Die Beiträge der Schwerewellen, thermischer Gezeiten, Rossby und Kelvin Wellen zur zonal gemitteltem Impulsbalance der Mesosphäre und unteren Thermosphäre wurden untersucht.

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22

Zhang, Qian. "Use of Time Series Analysis to Evaluate the Impacts of Underground Mining on Hydrological Properties of Dysart Woods, Ohio". Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1282225890.

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23

Manolache, Sorin. "Schedulability analysis of real-time systems with stochastic task execution times". Licentiate thesis, Linköping University, Linköping University, ESLAB - Embedded Systems Laboratory, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5730.

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Abstract (sommario):

Systems controlled by embedded computers become indispensable in our lives and can be found in avionics, automotive industry, home appliances, medicine, telecommunication industry, mecatronics, space industry, etc. Fast, accurate and flexible performance estimation tools giving feedback to the designer in every design phase are a vital part of a design process capable to produce high quality designs of such embedded systems.

In the past decade, the limitations of models considering fixed task execution times have been acknowledged for large application classes within soft real-time systems. A more realistic model considers the tasks having varying execution times with given probability distributions. No restriction has been imposed in this thesis on the particular type of these functions. Considering such a model, with specified task execution time probability distribution functions, an important performance indicator of the system is the expected deadline miss ratio of tasks or task graphs.

This thesis proposes two approaches for obtaining this indicator in an analytic way. The first is an exact one while the second approach provides an approximate solution trading accuracy for analysis speed. While the first approach can efficiently be applied to monoprocessor systems, it can handle only very small multi-processor applications because of complexity reasons. The second approach, however, can successfully handle realistic multiprocessor applications. Experiments show the efficiency of the proposed techniques.

Report code: LiU-Tek-Lic-2002:58.

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24

Crystal, Lisa. "Quantum Times: Physics, Philosophy, and Time in the Postwar United States". Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10973.

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The concept of time in physics underwent significant changes in the decades following World War II. This dissertation considers several ways in which American physicists grappled with these changes, analyzing the extent to which philosophical methods and questions played a role in physicists' engagement with time. Two lines of questioning run through the dissertation. The first asks about the professional identities of postwar American physicists in relation to philosophy, as exemplified by their engagement with the concept of time. The second analyzes the heterogeneous nature of time in physics, and the range of presuppositions and assumptions that have constituted this "fundamental" physical concept. The first chapter looks to the development of atomic clocks and atomic time standards from 1948-1958, and the ways in which new timekeeping technologies placed concepts such as “clock”, “second,” and “measure of time” in a state of flux. The second chapter looks to the experimental discovery of CP violation by particle physicists in the early 1960s, raising questions about nature of time understood as the variable “t” in the equations of quantum mechanics. The third chapter considers attempts to unify quantum mechanics and general relativity in the late 1960s, which prompted physicists to question the “existence” of time in relation to the universe as a whole. In each episode considered, physicists engaged with the concept of time in a variety of ways, revealing a multiplicity of relationships between physics, philosophy, and time. Further, in each case physicists brought a unique set of assumptions to their concepts of time, revealing the variety ways in which fundamental conceptsfunctioned and changed in late twentieth century physics. The result is a heterogeneous picture of the practice of physics, as well as one of physics’ most basic concepts.
History of Science

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25

McNichols, Sean T. "Reducing intraday patient wait times through just-in-time bed assignment". Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99014.

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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, 2015. In conjunction with the Leaders for Global Operations Program at MIT.
Thesis: S.M., Massachusetts Institute of Technology, Engineering Systems Division, 2015. In conjunction with the Leaders for Global Operations Program at MIT.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 120-121).
Massachusetts General Hospital (MGH) is the oldest and largest hospital in New England as well as the original and largest teaching hospital of the Harvard Medical School. The neuroscience units experience patient flow issues similar to those observed throughout MGH, including high bed utilization and long intraday patient wait times. This project focuses on the neuroscience units as a microcosm of the hospital. MGH consistently operates near capacity. Patients from the emergency department, the perioperative environment, intensive care units (ICUs) and other sources compete for beds. The admitting department manages the bed assignment process across MGH. Assignments are often made without access to all relevant information, such as expected admission, surgery and discharge timing. As a result of common procedures, patients are frequently assigned to a bed before they are clinically ready to move. Our analysis reveals that suboptimal bed assignment and patient transfer processes are among the leading root causes of intraday patient delays. The primary objective of the project is to develop a bed assignment policy to reduce intraday patient wait times. The policy consists of a bed assignment algorithm and enabling bed management processes. To account for patient acuity, the algorithm segments patients by movement (e.g., ED-to-ICU). The target maximum wait for each segment is the acceptable wait length (AWL). The algorithm ranks patients based on their ready times and the AWLs, and assigns beds primarily on a just-in-time (JIT) basis. The enabling bed management processes include small-scale early discharge and early transfer interventions to better align the intraday timing of demand for inpatient beds with available capacity. A simulation of neuroscience patient flow is used to evaluate different approaches. The model shows that adoption of the JIT policy would increase the percentage of patients who experience bed waits within the AWL for all movement types. Predicted bed waits for patients who require ICU-level care would be 30 minutes or less for 90% of ED patients and 95% of OR patients (improvements from historical baselines of 44% and 91%, respectively). Predicted bed waits for transfers to floor beds would be two hours or less for 81% of ED patients and 93% of OR patients (improvements from historical baselines of 63% and 84%, respectively). The solution significantly reduces intraday patient wait times without a major increase in hospital capacity.
by Sean T. McNichols.
M.B.A.
S.M.

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26

Berry, Tyrus Hunter. "An overview of Optimal Stopping Times for various discrete time games". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211918753.

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27

Flora, Megan. "Diel, Tidal, and Sex Based Differences in Time Spent Feeding by the Florida Manatee (Trichechus manatus latirostris)". NSUWorks, 2012. http://nsuworks.nova.edu/occ_stuetd/190.

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Abstract (sommario):

The feeding behavior of an animal is based on adaptations to the environment and the animal’s body condition. The Florida manatee (Trichechus manatus latirostris) is an example of a marine mammal that may alter its feeding pattern based on diel and tidal cycles. The increased presence of boats during the day could potentially cause manatees to alter their feeding rates, or the time spent feeding per hour, over the diel cycle. Tide levels may cause manatees to be restricted from areas of preferred vegetation. In addition, the differential reproductive investment between males and females may cause differential time dedicated to feeding between the sexes. This study analyzed sound recordings (lasting up to 24 hr) from manatees tagged in southwest Florida with a digital acoustic recording tag (DTAG) between April and September. Distinctive chewing sounds were indicative of feeding activity. Variation in time spent feeding was analyzed in relation to time of day, sex, female reproductive status, and water level as affected by tides. Manatees dedicated 26% of the time (6 hours) to feeding, on average. During the first year of the study, manatees spent 39% of the time feeding (9 hours), on average, over the course of a 24-hour period; during the second year they spent 15% (2 hours) over the course of a 13-hour daytime period. Adult females fed significantly more, on average, than adult males. Females in late-term pregnancy appeared to spend more time foraging than other non-lactating females, but the sample size was too small to be definitive. Manatee time spent feeding was not correlated with time of day. Increases in feeding activity occurred at mid to high tide levels. This may indicate that manatees had greater access to preferred food sources at this time. An understanding of when manatees 5 are most likely to be feeding and which environmental factors influence this activity may suggest ways to reduce impacts on the endangered population.

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28

Keller, Peter, Sylvie Roelly e Angelo Valleriani. "On time duality for quasi-birth-and-death processes". Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/5697/.

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Abstract (sommario):

We say that (weak/strong) time duality holds for continuous time quasi-birth-and-death-processes if, starting from a fixed level, the first hitting time of the next upper level and the first hitting time of the next lower level have the same distribution. We present here a criterion for time duality in the case where transitions from one level to another have to pass through a given single state, the so-called bottleneck property. We also prove that a weaker form of reversibility called balanced under permutation is sufficient for the time duality to hold. We then discuss the general case.

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29

Qi, Songwei. "Use of International Hydrographic Organization Tidal Data for Improved Tidal Prediction". PDXScholar, 2012. https://pdxscholar.library.pdx.edu/open_access_etds/900.

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Tides are the rise and fall of water level caused by gravitational forces exerted by the sun, moon and earth. Understanding sea level variation and its impact currents is very important especially in coastal regions. With knowledge of the tide-generating force and boundary conditions, hydrodynamic models can be used to predict or model tides in coastal regions. However, these models are not sufficiently accurate, and in-situ tide gauge data may be used to improve them in coastal regions. The International Hydrographic Organization (IHO) tidal data bank consists of over 4000 tide gauge stations scattered all around the globe, most of which are in coastal regions. These tide gauge data are very valuable for tidal predictions. One drawback of the IHO data is that a considerable number of stations are located in rivers or near man-made structures or small-scale, complex topographic features. Another drawback is the unknown accuracy of the IHO data. To avoid these drawbacks, quality control has been done in the present study. Each IHO tide gauge station has been categorized according to its proximity to rivers, lagoons, man-made harbors, and other factors that may influence tidal elevation. Quantitative metrics such as water depth, distance to the continental shelf break, and horizontal length scale of station site morphology have been computed. Comparisons among IHO data, the output of O.S.U. Tidal Inversion Software (OTIS), and other data sources, such as Global Sea-Level Observing System (GLOSS) data, have been done to test the quality and accuracy of IHO data. Moreover, the characteristics of stations with large error have also been examined. The good comparison of IHO with duplicate GLOSS stations shows that, as far as can be determined, IHO data are reliable and ought to be used in improving coastal tide models. The non-Gaussian character of the errors suggests that further improvements in tidal modeling will require advances in data assimilation which are robust to non-Gaussian data error.

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30

Wong, Tse-man Ken, e 黃子文. "Red tides and algal blooms in subtropical Hong Kong waters: field observations and Lagrangianmodeling". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B45015090.

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31

Subramanian, Chidambaram. "Real-Time Implementation of Road Surface Classification using Intelligent Tires". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/101014.

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Abstract (sommario):

The growth of the automobile Industry in the past 50 years is radical. The development of chassis control systems have grown drastically due to the demand for safer, faster and more comfortable vehicles. For example, the invention of Anti-lock Braking System (ABS) has resulted in saving more than a million lives since its adaptation while also allowing the vehicles to commute faster. As we move into the autonomous vehicles era, demand for additional information about tire-road interaction to improve the performance of the onboard chassis control systems, is high. This is due to the fact that the interaction between the tire and the road surface determines the stability boundary limits of the vehicles. In this research, a real-time system to classify the road surface into five major categories was developed. The five surfaces include Dry Asphalt, Wet Asphalt, Snow, and Ice and dry Concrete. tri-axial accelerometers were placed on the inner liner of the tires. An advanced signal processing technique was utilized along with a machine learning model to classify the road surfaces. The instrumented Volkswagen Jetta with intelligent tires was retrofitted with new instrumentation for collecting data and evaluating the performance of the developed real-time system. A comprehensive study on road surface classification was performed in order to determine the features of the classification algorithm. Performance of the real-time system is discussed in details and compared with offline results.
Master of Science

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32

Armstrong, Paul Walter. "Fact or fiction : the problem of bias in Government Statistical Service estimates of patient waiting times". Thesis, London School of Hygiene and Tropical Medicine (University of London), 2000. http://researchonline.lshtm.ac.uk/682277/.

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Abstract (sommario):

The cumulative likelihood of admission estimated for any given 'time-since-enrolment' depends on how we define membership of the population 'at-risk' and on how we handle right and left censored waiting times. As a result, published statistics will be biased because they assume that the waiting list is both stationary and closed and exclude all those not yet or never to be admitted. The cumulative likelihood of admission within three months was estimated using the Government Statistical Service method and compared with estimates which relaxed the assumption of stationarity and reflected variation in the numbers recruited to, and admitted from, the waiting list each quarter. The difference between the two estimates ranged from +5.5 to -9.1 percentage points among 11 Orthopaedic waiting lists in South Thames Region. In the absence of information on 'times-to-admission', exact 'times-since-enrolment' were extracted from Hospital Episode Statistics and assumed to be similarly distributed. In the absence of information on 'times-to-competing-event', the number of competing events falling in each waiting time category was estimated by differencing. A period lifetable was constructed using these approximations, census counts, counts of the number of new recruits and estimates of the number 'reset-to-zero' each quarter. The results support the view that the method used by the Government Statistical Service overestimates the cumulative likelihood of elective admission among those listed. The Government Statistical Service calculates the cumulative likelihood of admission within three months (range: 0.62-0.27) conditional on the fact of admission. Multiplying by the unconditional likelihood of being admitted (range: 0.93-0.31) estimates the cumulative likelihood of admission within three months among those listed (range: 0.55-0.12) and gives a rather different ranking of waiting list performance among 34 Orthopaedic waiting lists in South Thames Region.

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33

Forbes, Graeme A. "The times they are a-changin' : rehabilitating the growing-block view of time". Thesis, University of Sheffield, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531222.

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34

Truong, Gold. "Forecasting linehaul transit times & on time delivery probability using quantile regression forests". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/90751.

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Thesis: M.B.A., Massachusetts Institute of Technology, Sloan School of Management, 2014. In conjunction with the Leaders for Global Operations Program at MIT.
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2014. In conjunction with the Leaders for Global Operations Program at MIT.
Cataloged from PDF version of thesis.
Includes bibliographical references (page 85).
with delays on the road and variabilities introduced by the major participants in the process, ie: distribution centers, drivers, etc. These sources of variability also make it difficult to measure the impact changes in transit time have on on-time performance. This paper focuses on trying to identify indicators of variability and incorporates them into quantile regression forest, a black box forecasting model, that will provide estimated scheduled transit times for a given probability of on-time arrival at the destination. With the use of Amazon's Q1 & Q2 2013 linehaul data, an analysis on performance trends based on length of haul were categorized to develop an understanding linehauls in North America. The outbound transportation team at Amazon faces the complex trade off between providing a sufficient amount of scheduled transit time to ensure ontime delivery to destination and the utilization rate of a truck. The ability to quantify how changes in scheduled transit time impact the performance of a particular linehaul allows transportation managers to assess this trade off. The paper explores a machine learning regression technique called quantile regression forests. The model was developed in R using the quantregforest package. It incorporates numerous factors about linehaul including: origin, destination, historical reporting on sources of late to arrivals, time to depart from origin and time of departure. The strengths of this black box model are in its ability to handle a large amount of data and continuously update its predicting structure to provide more accurate recommendations. Quantile regression forests also enable the user to specify the ontime performance percentage, p, that he/she wants the model to predict based on historical data. The final model at p = 95% provided a weight mean absolute percent error of 4.57% and a root mean square error of 2.22%. A four-week pilot was conducted to validate these predictions and the results are discussed.
by Gold Truong.
M.B.A.
S.M.

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35

Matthew, David A. "Bodies of blended times time compression figures and the imagination of the future /". [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0002419.

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36

Jaireth, Subhash, e Subhash Jaireth@ga gov au. "Theatre of the times of Socrates, Lunin and Nero : Time and space in Edvard Radzinskiis trilogy Theatre of the Times ". The Australian National University. Faculty of Arts, 1996. http://thesis.anu.edu.au./public/adt-ANU20091027.093131.

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Between 1969 and 1980 Edvard Radzinskii wrote three historico-political plays which were later published as a trilogy entitled Theatre of the Times . This thesis attempts to unravel the nature of time in the trilogy and invokes Mikhail Bakhtins notion about the forms of time and the chronotope in literary narratives to do that. Bakhtinian concept of the chronotope provides a suitable strategy for reading a trilogy that aims to re-present real time, place and human beings. The concept also provides a vantage point from where the trilogy can be read both from within the time-space of its main protagonists and from that of its author, readers, performers and spectators. ¶ Both Dialogues with Socrates' and 'Lunin are structured around the chronotope of the prison which is associated with the chronotope of the acropolis in Dialogues with Socrates and with the chronotope of the masked-ball in Lunin . In Theatre of the Times of Nero and Seneca the circus-theatre functions as the main chronotope. All these chronotopes serve as plot-constitutive devices and provide appropriate space in which the lives and times of the main protagonists can be adequately re-presented. However, the use of the concept of the chronotope in reading the trilogy does not imply that it can be read meaningfully only from within the time-space of its protagonists. The trilogy reconstructs the historical time-space but also engages in a substantial way with contemporary Soviet reality. This is achieved through an interaction between literary and real chronotopes. There is little doubt that most Soviet readers, performers and spectators negotiatied the chronotopes of the prison and the circus-theatre and the motifs of show-trial and execution from within their own time-space, their own historical experience. The thesis discusses a large number of reviews published in Soviet media to show that most critics read the trilogy from within the discourses about positive hero and socialist realism, because of which Socrates and Lunin were also turned into positive heroes. ¶ One of the most intriguing aspect of the three plays is the play within a play structure which achieves its maximum potential in the final play of the trilogy where it is combined with the theme of metamorphoses and multiple role playing. The trilogy, like Pirandellos trilogy about theatre, is able to foreground its own theatricality and explore the role of theatricality and role playing in and outside theatre. In Theatre of the Times of Nero and Seneca the boundary between role playing in life and in theatre becomes so blurred that history begins to resemble the writing and staging of a play. ¶ Apart from exploring the nature of theatricality, the trilogy also questions the conventions of its genre. The three plays do not follow the conventional framing devices employed by dramatic texts and foreground the presence of a mediating narrator. This novelisation, is more evident in Lunin in which the frequent use of verbs in the past tense in the extra-dialogic text can be linked to the presence of a mediating narrator.

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López, García Fernando. "Real-time surface grading of ceramic tiles". Doctoral thesis, Universitat Politècnica de València, 2008. http://hdl.handle.net/10251/1909.

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This thesis presents a case of study of the development and performance analysis of a surface grading application with real-time compliance. We address the issue of spatial and temporal uniformity in the acquisition system. In a surface grading application it is crucial to ensure the uniform response of the system through time and space. All the results presented for surface grading were obtained using real data from the ceramic tile industry. The VxC TSG database is public and can be accessed at www.disca.upv.es/vision/vxctsg. We present a method based on soft colour-texture descriptors computed in perceptually uniform colour spaces. The method is parameterized and the involved factors are studied using two statistical procedures; experimental design and logistic regression. Although it is not a new theoretical contribution, we have found and demonstrate that a simple set of global colour and texture statistics, together with well-known classifiers, are powerful enough to meet stringent factory requirements for real-time and performance. Also the method is compared with two other approaches from the scientific literature; Colour Histograms and Centile-LBP. Finally, we explore the method's capacity for on-line inspection in a study of real-time compliance and parallelization.
López García, F. (2005). Real-time surface grading of ceramic tiles [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/1909
Palancia

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38

Abe, Yoshihiro. "Cover times and extrema of local times for random walks on graphs". 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215283.

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39

McSorley, Tom. "Modern times : time and the modern in the fiction films of William D. MacGillivray". Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33477.

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Abstract (sommario):

The work of contemporary Atlantic Canadian filmmaker William O. MacGillivray is a set of confrontations. His five fiction feature films investigate, perhaps even recalibrate, conventionally understood ideas of centre and margin, time and space, and most pointedly, traditional and modern. What MacGillivray presents in his work is not, in the manner of George Grant, a lament for a traditional or old and noble world locked inexorably in the processes of technological erasure. Instead, echoing the actively ambivalent response to technology-induced change advanced by Harold Innis and others, what the films reveal is a range of possible alternative critical positions within the experience of modern lite in contemporary Atlantic Canada. As Carlos Fuentes reminds us, this does not necessarily entail 'sacrificing the past in favour of the new,' as much of the rhetoric surrounding notions of the modern insists, but rather the 'maintaining, comparing, and remembering values we have created, making them modern so as not lose the value of the modern.' ln a sense, this process is about remembering time. Fundamentally, in creating rich, complex narratives about a part of Canada facing considerable and rapid change, MacGillivray is making his own cinematic 'plea for time' in his confrontations with notions of what constitutes a modern existence. It is also a plea for space, to remember that as there are 'different modern times' there are also 'different modern spaces.'

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40

Dahl, Valerie, e Mikael Davidsson. "Route flow estimation based on time-dependent route choice sets and historical travel times". Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-130007.

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Abstract (sommario):

Since congestion leads to variations in travel time which gives a variation in the traffic flow, it is interesting to estimate the traffic flow in larger cities where cars drive in a limited space. In order to estimate the traffic flow, different traffic models are usually used. These models often use volume-delay functions which calculate the travel times for each link depending on the current traffic flow. However, in these models, the process for reaching equilibrium can be time consuming and it is hard to calibrate the volume-delay functions for a road network with a large set of links. Instead, we assume that it is relatively simply to measure or collect historical time-dependent travel times on a large set of links. With this assumption, a method that uses time-dependent route choice sets and time-dependent travel times in order to estimate time-dependent route flows, is developed. In this thesis, the method was applied to Stockholm County where it is interesting to study the route choice since congestion occurs in the area which generate variations in travel time. In order to estimate time-dependent route flows, a time-sliced OD-matrix was created by dividing the matrix for the peak hour using two different time-slicing distributions. The time-dependent route choice set with time-dependent travel times was created by using an existing route planning tool. These routes were mapped to the links in a road network in order to estimate link flows. The mapping was done by using map matching and a shortest path algorithm. Route shares were decided by using a method that splits the demand equally among the routes in the route choice set for an OD-pair, and with a logit model that takes travel time into account with the assumption that the travel time can affect a traveler’s route choice. The evaluation of the resulting link flows was done by comparing these link flows with observed link flows using different time-slicing distributions and route share models. Furthermore, the method’s resulting link flows was evaluated against the resulting link flows from a scenario where all travelers are assumed to choose the shortest path, in terms of free flow travel time, between each OD-pair. The developed method can estimate link flows so that 27.9 % of the links have a GEH value less than 5, which can be compared to the commonly used acceptance criteria of 85 %. This shows that the method needs to be developed further in order to achieve link flow estimations that fulfills the acceptance criteria. Even though the overall result show that the developed method does not fulfill the acceptance criteria, the method works well on some individual links. Furthermore, the resulting link flows from the developed method match the observed link flows better than the resulting link flows from the scenario where all travelers are assumed to choose the shortest path.

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41

Mavimbela, Gcina A. "Time Reparametrization Symmetry and Spatial-Temporal Fluctuations in Glasses". Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1354211400.

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42

Arenas, Salazar Eduardo Enrique. "Propuesta de mejora de proceso en el área de producción para el cumplimiento de la programación en una empresa de fabricación de papel higiénico". Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/652413.

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Abstract (sommario):

En la empresa que es motivo de esta investigación se evidencian tiempos perdidos en la línea de conversión Línea 60 que pertenece al área de producción; Estas pérdidas de tiempo, que se contabilizan en S/. 4’ 639,858 al año, se encuentran vinculadas a la falta de control, estandarización de actividades y falta de competencias en la parte operativa que garanticen la obtención de mayores y mejores indicadores de producción. El objetivo de esta investigación fue describir una propuesta metodológica para el establecimiento del lean manufacturing, a través de algunas de sus herramientas como el SMED, 5S, Takt time, Mantenimiento autónomo y JIT y, con el apoyo del estudio de tiempos y diagrama de precedencias, establecer planes de acción y estándares de operación. Con esta implementación se logró una reducción de tiempos improductivos del orden del 10% llegando a obtener un ahorro trimestral de S/. 633,318.82.
In the company that is the reason for this investigation are evidenced times lost in the line of conversion Line 60 that belongs to the area of production; These losses of time, which are accounted for in S/. 4’ 639,858 a year, are linked to the lack of control, standardization of activities and lack of competencies in the operative part that guarantee the obtaining of greater and better production indicators. The objective of this research was to describe a methodological proposal for the establishment of lean manufacturing, through some of its tools such as SMED, 5S, Takt time, autonomous maintenance and JIT and, with the support of the time study and precedence diagram, to establish action plans and Standards of operation. With this implementation, a reduction of unproductive times of the order of 10% was achieved, obtaining a quarterly saving of S /. 633,318.82.
Tesis

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43

Wang, Chenyang. "Subjectivity in-between times : an exploration of the notion of time in Jacques Lacan's work". Thesis, Birkbeck (University of London), 2018. http://bbktheses.da.ulcc.ac.uk/351/.

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Abstract (sommario):

Although time has been seriously contemplated by various philosophies of the Western tradition, it remains an underdeveloped topic in Lacanian studies. This thesis attempts to provide a comprehensive elaboration of the notion of time in Jacques Lacan’s work and to develop an argument to show how it contributes to our understanding of subjectivity. By working through various presentations of time in Lacan’s writings, this thesis puts forward the idea of dual temporality and demonstrates how it supports Lacan’s overall theoretical position. Chapter one introduces the idea of dual temporality through a critical examination of Lacan’s “Logical Time” essay. It is shown that Lacan’s “perfect solution” to the prisoner’s dilemma is logically flawed. It constructs an imaginary temporal experience that covers the unresolved tension between two temporal registers, which I name Real time and Symbolic time respectively. The two independent temporal registers are further explored in the context of the Real body and the Symbolic order. Chapter Four discusses how the fundamental desynchrony between these two temporal registers initiates the process of subject-formation, which is symptomatic in its essence. Chapter five develops a new epistemology of sexed subjectivity built upon a fresh reading of the relationship between time and sexual difference. Whereas others have thought that time is an intrinsic human experience, the result of my work is to show that, on the contrary, time in Lacan’s work is characterised by otherness and alterity, experienced by the subject as foreign and alienating. It is argued that the very split nature of the Lacanian subject shall be understood through time that is split in itself.

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44

Stroud, Trevor. "Enhancing vehicle dynamics through real-time tyre temperature analysis". Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020599.

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Abstract (sommario):

Vehicle suspension optimisation is a complex and difficult task, as there are a variety of factors influencing the dynamic performance of a vehicle. During suspension development, the optimisation of a selected few of these factors is often to the detriment of others, as they are all inter-related. In addition, expertise in vehicle setup and suspension tuning is scarce, and is limited to experienced racing teams and large automotive manufacturers with extensive research and development capabilities. The motivation for this research was therefore to provide objective and user-friendly methodologies for vehicle suspension optimisation, in order to support student projects like Formula Student, while having relevance to the needs of the South African automotive industry and racing community. With the onset of digital data acquisition, it has become feasible to take real-time measurements of tyre temperatures, to provide information on how a tyre is performing at a specific point on the track. Measuring the tyre surface temperature can provide a useful indication on whether the tyre is loaded equally or not, and what suspension adjustments should be made to improve tyre load distribution.

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45

Johns, Stuart Lionel. "A study of methods to overcome manufacturing lead time instability". Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240274.

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46

Danielsson, Jakob, e Tobias Andersson. "Investigating Methods For Measuring Network Convergence Times". Thesis, Mälardalens högskola, Inbyggda system, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-31822.

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Abstract (sommario):

This thesis investigates different methods that can be used for analyzing network performance and,ultimately, can be used for measuring the convergence time of ring coupled networks. As of today,many networks are often run with extra links, serving as backup links in case any that of the mainlinks would go down. To operate networks with backup links in layer 2 and layer 3, specific re-routing protocols such as RIP and OSPF are used in order to calculate a feasible path through anetwork when a network state changes. Depending on different implementations of the protocolsand the hardware used, the convergence times can vary substantially, which means measuring thenetwork performance is a very important part when developing a network solution. To executenetwork tests, a packet engine suite is used consisting of a network traffic generator that is used forcreating a packet stream, as well as a traffic receiver that fetches the packets sent. Various types ofengines can be used including Linux based, real-time operating systems based and bare-metal basedsolutions. From these different types of engines, a few tools are chosen and investigated on differentproperties including performance and usability. It was found that Tshark (Linux, RT-Linux based),USPI (Raspberry Pi bare metal), FreeRTOS (Raspberry Pi based), Arduino and PKTgen (Linuxkernel based) were the most suitable approaches to be used for testing. The test parameters includetesting the gaps between packets, maximum jitter, average jitter and packets sent per second. Thesetests revealed that an IXIA solution was slightly more accurate when used as a receiving end sinceit produced less jitter, however this difference could only be noticed in a micro second range. Itwas also revealed that it produced slightly less jitter than the other packet generators, also here onlynoticeable in a microsecond range. Thus it can be concluded that IXIA is not much superior any ofthe close to hardware solutions. The executed network tests revealed that the Westermo developedlayer 2 protocol FRNT generated less network convergence time and less packet losses than thecommonly used RSTP protocol. Similar tests against the layer 3 protocols revealed that RIP wasmuch faster than OSPF and it also lost less packets. Finally it is concluded that there is no needto buy an expensive network testing suite to test the convergence time of a network. Instead, anetwork testing suite can be developed with minimal funding.

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47

Philip, Richard Charles. "Doubling Times in Finance". Thesis, The University of Sydney, 2011. http://hdl.handle.net/2123/8372.

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This dissertation proposes an alternative measure of performance, termed doubling time. Doubling time is defined as the time taken for an initial investment in an asset to double in value. This alternative performance metric has an intuitive appeal yet has received little attention in the academic literature to date. This thesis provides the foundations required for the use of doubling times in finance.The work begins by examining the problem of computing the expected doubling time from a sample of doubling times. Analytical formulae and a simulation are proposed as alternative approaches to estimating the expected doubling time. Using these methods,expected doubling times are computed for the Australian equity market, using both price and accumulation indices. Expected doubling times are also computed for bonds. The doubling time is then modelled as a first passage time problem. It is shown that if returns are normally distributed then the doubling times will be inverse Gaussian distributed. It is also shown that, regardless of the underlying distribution the returns follow, the simulated doubling time is very likely to be inverse Gaussian distributed. Following this, portfolio formation using doubling times is investigated. It is shown that minimising either the skewness, or the inverse shape parameter, of the doubling times inverse Gaussian distribution, result in points on the efficient frontier for returns that are identical to those obtained under the classical Markowitz framework. In this way a two parameter (mean and variance) portfolio optimisation problem is reduced to a one parameter problem (skewness or shape). Measurement errors can result in the ex-post performance of optimised portfolios being no better than naive equally weighted portfolios. This is sometimes referred to as the problem of error maximisation in portfolio formation. A doubling time transformation is used to reduce the problem of error maximisation, and the results indicate an improvement in the ex-post performance of the optimised portfolios.

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Kardinal, Mareike [Verfasser], e Georg [Akademischer Betreuer] Kerkhoff. "Adaptive times : modulating time perception in neglect patients and healthy individuals / Mareike Kardinal. Betreuer: Georg Kerkhoff". Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2014. http://d-nb.info/1054054452/34.

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Deeg, Alexander. "Homiletical Squib: “A time to keep silence, and a time to speak” (Eccl 3:7b) Preaching and keeping silent in times of the COVID19-pandemic". Universität Leipzig, 2020. https://ul.qucosa.de/id/qucosa%3A72279.

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Rutigliano, Roberta. "Fertility and family ties in times of demographic changes". Doctoral thesis, Universitat Pompeu Fabra, 2017. http://hdl.handle.net/10803/669620.

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This thesis investigates how big economic and demographic changes over the past century influence fertility dynamics with a particular focus on family ties. The first chapter investigates the role of type of partnership in shaping fertility behaviours. Comparing two orthogonally different countries like Norway and Spain, we analyse differences in fertility behaviours between cohabiting and married couples in both countries. For Norway, we find a significant association between selection into either partnership type and fertility, whereas for Spain, a newcomer to cohabitation, we find a significant association between fertility and selection into marriage. The second chapter analyses the role of the so called “bean-pole” family on fertility. It investigates whether would-be grandparents’ propensity to care for their grandchildren influences their transition into parenthood. Considering national context, I estimate distinct models for different groups of countries. Comparison across 11 countries from the first two waves of the Survey of Health, Aging, and Retirement in Europe reveal that grandparental childcare propensity has a positive and significant effect on the transition into parenthood for both pronatalist (Belgium, France) and protraditional countries(Austria, Germany, Greece, Italy, Spain, and Switzerland). The third chapter focuses on grandparental childcare provision. By using an instrumental variable approach, it explores the effect of grandparental childcare, during the first year of the first born, on the risk of a second birth transition among UK couples. The analysis is carried out using the first five waves of the Millennium Cohort Study (MCS). Results show a positive and significant effect of grandparental childcare on the risk of second birth. This effect is slightly weakened by level of income
Aquesta tesi investiga com els grans canvis econòmics i demogràfics ocorreguts durant l’últim segle han influenciat les dinàmiques de fertilitat, amb especial èmfasi en els vincles familiars. El primer capítol investiga el rol del tipus de parella en la configuració dels patrons de fertilitat. Mitjançant la comparació de dos països ortogònicament diferents, Noruega i Espanya, analitzem les diferències d’aquests dos països en els comportaments de fertilitat entre la cohabitació i el matrimoni. A Noruega trobem una associació significativa entre la selecció en qualsevol tipus de parella i la fertilitat, mentre que per a Espanya, a on el fenomen de la cohabitació és més recent, trobem una associació significativa entre la fertilitat i la selecció al matrimoni. El segon capítol analitza el paper de l'anomenada família bean-pole en la fertilitat, analitzant en detall si la propensió dels futurs avis a cuidar els seus néts influeix en la transició cap a la paternitat dels seus fills. En aquest cas, i tenint en compte el context nacional, es calculen diferents models per a diferents grups de països. La comparació entre 11 països de les dues primeres ones de l'Enquesta de Salut, Envelliment i Jubilació a Europa (SHARE) revela que la propensió a cuidar els néts té un efecte positiu i significatiu sobre la transició cap a la paternitat, tant per als països pro-natalistes (Bèlgica, França) com per als països pro-tradicionals (Àustria, Alemanya, Grècia, Itàlia, Espanya i Suïssa). Per últim, el tercer capítol es centra en l’efecte que produeix l’atenció als primer néts per part dels avis sobre un possible segon naixement entre les parelles del Regne Unit. Mitjançant l'ús d'un enfocament de la variable instrumental, l’anàlisi es realitza mitjançant les primeres cinc ones del Millennium Cohort Study (MCS). Els resultats mostren un efecte positiu i significatiu dels avis en el risc d’un segon naixement. Aquest efecte està lleugerament debilitat pel nivell d'ingressos.

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Tesi sul tema "The Tides Of Time"

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