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Gotowa bibliografia na temat „Transit method”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 9 czerwca 2025

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Artykuły w czasopismach na temat "Transit method"

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Windemuth, Diana, Eric Agol, Josh Carter, Eric B. Ford, Nader Haghighipour, Jerome A. Orosz, and William F. Welsh. "An automated method to detect transiting circumbinary planets." Monthly Notices of the Royal Astronomical Society 490, no. 1 (September 21, 2019): 1313–24. http://dx.doi.org/10.1093/mnras/stz2637.

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ABSTRACT To date a dozen transiting ‘Tatooines’ or circumbinary planets (CBPs) have been discovered, by eye, in the data from the Kepler mission; by contrast, thousands of confirmed circumstellar planets orbiting around single stars have been detected using automated algorithms. Automated detection of CBPs is challenging because their transits are strongly aperiodic with irregular profiles. Here, we describe an efficient and automated technique for detecting circumbinary planets that transit their binary hosts in Kepler light curves. Our method accounts for large transit timing variations (TTVs) and transit duration variations (TDVs), induced by binary reflex motion, in two ways: (1) We directly correct for large-scale TTVs and TDVs in the light curves by using Keplerian models to approximate binary and CBP orbits; and (2) We allow additional aperiodicities on the corrected light curves by employing the Quasi-periodic Automated Transit Search algorithm. We demonstrate that our method dramatically improves detection significance using simulated data and two previously identified CBP systems, Kepler-35 and Kepler-64.

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Jin, Haitao, Fengjun Jin, Jiao’e Wang, Wei Sun, and Libo Dong. "Competition and Cooperation between Shared Bicycles and Public Transit: A Case Study of Beijing." Sustainability 11, no. 5 (March 3, 2019): 1323. http://dx.doi.org/10.3390/su11051323.

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As an eco-friendly transportation mode, shared bicycles provide a new option for public transit users in urban areas. China’s bicycle-sharing market began flourishing in July 2016 and reached a plateau in 2017. How shared bicycles influenced public transit systems during this period is an interesting topic. A case study of Beijing is conducted. This study aims to identify the competitive and cooperative influences of shared bicycles on public transit by exploring the changes in public transit trip distances before and after the upsurge in bicycle-sharing. A histogram shifting method is introduced to examine the influences of shared bicycles on public transit services from a travel distance perspective. A spatial correlation of bicycling usage and public transit changes is calculated using units of gridded cell spaces. The results show: (1) overall transit usage continued growing after the shared bicycles market reached a plateau; (2) short public transits within 2 km decreased while transfers within 2 km increased; and (3) the decrease of short transits and increase of transfers within 3 km were spatially highly correlated to the usage of shared bicycles. Hence, the role of bicycle-sharing systems is competitive for existing public transit systems during short trips and cooperative for connecting transits.

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Li, Teng, and Eryu Zhu. "Quantifying Carbon Emissions Generated by Monorail Transits: A Life Cycle Assessment Approach." Computational Intelligence and Neuroscience 2022 (March 24, 2022): 1–15. http://dx.doi.org/10.1155/2022/3872069.

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The use of rail transits results in the generation of a large amount of carbon emissions. Throughout the life cycle of a rail transit system, huge amounts of carbon are emitted, which contributes to the threat posed by carbon emission on the city ecosystem. Despite the many methods previously proposed to quantify carbon emissions from rail transit systems, a method that can be applied to measure carbon emissions of monorail systems is yet to be developed. We have used the life cycle assessment (LCA) method to propose a method that can be used to quantify carbon emissions from monorail transits. The life cycle of a monorail transit system was divided into four stages (production, construction, use, and end-of-life). A monorail transit line segment in Chongqing, China, was selected for a case study. The results show that the “use” stage of the monorail transit line system significantly increases (93.2%) carbon emissions, while the “end-of-life” stage does not contribute significantly to the total carbon emitted. The processes of generation of steal, concrete, and cement are the three leading processes that contribute to the emission of carbon dioxide. The percentages of carbon emitted during these processes are 32%, 29.6%, and 13.3%, respectively. Prestressed concrete activity accounts for the largest proportion (91.1%) of the total carbon emissions. The results presented herein can potentially help in realizing sustainable development and developing green transportation.

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Gilbert, Gregory J. "Accurate Modeling of Grazing Transits Using Umbrella Sampling." Astronomical Journal 163, no. 3 (February 4, 2022): 111. http://dx.doi.org/10.3847/1538-3881/ac45f4.

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Abstract Grazing transits present a special problem for statistical studies of exoplanets. Even though grazing planetary orbits are rare (due to geometric selection effects), for many low to moderate signal-to-noise ratio cases, a significant fraction of the posterior distribution is nonetheless consistent with a grazing geometry. A failure to accurately model grazing transits can therefore lead to biased inferences even for cases where the planet is not actually on a grazing trajectory. With recent advances in stellar characterization, the limiting factor for many scientific applications is now the quality of available transit fits themselves, and so the time is ripe to revisit the transit fitting problem. In this paper, we model exoplanet transits using a novel application of umbrella sampling and a geometry-dependent parameter basis that minimizes covariances between transit parameters. Our technique splits the transit fitting problem into independent Monte Carlo sampling runs for the grazing, nongrazing, and transition regions of the parameter space, which we then recombine into a single joint posterior probability distribution using a robust weighting scheme. Our method can be trivially parallelized and so requires no increase in the wall clock time needed for computations. Most importantly, our method produces accurate estimates of exoplanet properties for both grazing and nongrazing orbits, yielding more robust results than standard methods for many common star–planet configurations.

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Carpintero, D. D., and M. Melita. "An alternative stable solution for the Kepler-419 system, obtained with the use of a genetic algorithm." Astronomy & Astrophysics 620 (November 30, 2018): A88. http://dx.doi.org/10.1051/0004-6361/201731997.

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Context. The mid-transit times of an exoplanet may be nonperiodic. The variations in the timing of the transits with respect to a single period, that is, the transit timing variations (TTVs), can sometimes be attributed to perturbations by other exoplanets present in the system, which may or may not transit the star. Aims. Our aim is to compute the mass and the six orbital elements of an nontransiting exoplanet, given only the central times of transit of the transiting body. We also aim to recover the mass of the star and the mass and orbital elements of the transiting exoplanet, suitably modified in order to decrease the deviation between the observed and the computed transit times by as much as possible. Methods. We have applied our method, based on a genetic algorithm, to the Kepler-419 system. Results. We were able to compute all 14 free parameters of the system, which, when integrated in time, give transits within the observational errors. We also studied the dynamics and the long-term orbital evolution of the Kepler-419 planetary system as defined by the orbital elements computed by us, in order to determine its stability.

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Liu, Xinyao, Xinqing Hao, and Yuzhu Sun. "Determining the Presence of Transits of the Three Known Companions of Proxima Centauri." Theoretical and Natural Science 107, no. 1 (May 15, 2025): 243–51. https://doi.org/10.54254/2753-8818/2025.22743.

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Upon analyzing TESS data, we searched through 4 months of photometric observations of Proxima Centauri, focusing on Proxima b s 1.5% geometric transit probability. Our primary attention was directed towards four key lightcurves, each with 120-second exposures, as processed by SPOC. To minimize uncertainties from instrumental noise and stellar flares, we implemented some advanced data processing techniques. Searching for transits, we zeroed in on times corresponding to integral multiples of Proxima Centauri b's known 11.2-day period. To evaluate our sensitivity, we injected synthetic transits and found we could confidently detect those exceeding 3 millimagnitudes, which resembles a planet of radius around 5500 km. However, our analysis failed to confirm any apparent transits for Proxima Centauri b, and data for d and c were inconclusive due to uncertainties in their periods and transit times.Using the Box Least Squares method, we explored shorter periods, noting an elevated transit likelihood within 0-4 days, suggested by peaks in the transit probability graph. This hints at a possible low-period planet. In conclusion, while we found no definitive evidence of transits, data limitations prevent us from ruling out existence of transits of magnitude smaller than 3 milimagnitudes entirely.

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Kipping, David. "Transit origami: a method to coherently fold exomoon transits in time series photometry." Monthly Notices of the Royal Astronomical Society 507, no. 3 (August 2, 2021): 4120–31. http://dx.doi.org/10.1093/mnras/stab2013.

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ABSTRACT One of the simplest ways to identify an exoplanetary transit is to phase fold a photometric time series upon a trial period – leading to a coherent stack when using the correct value. Such phase-folded transits have become a standard data visualization in modern transit discovery papers. There is no analogous folding mechanism for exomoons, which would have to represent some kind of double fold: once for the planet and then another for the moon. Folding with the planet term only, a moon imparts a small decrease in the surrounding out-of-transit averaged intensity, but its incoherent nature makes it far less convincing than the crisp stacks familiar to exoplanet hunters. Here, a new approach is introduced that can be used to achieve the transit origami needed to double fold an exomoon, in the case where a planet exhibits transit timing variations (TTVs). This double fold has just one unknown parameter, the satellite-to-planet mass ratio, and thus a simple one-dimensional grid search can be used to rapidly identify power associated with candidate exomoons. The technique is demonstrated on simulated light curves, exploring the breakdown limits of close-in and/or inclined satellites. As an example, the method is deployed on Kepler-973b, a warm mini-Neptune exhibiting an 8-min TTV, where the possibility that the TTVs are caused by a single exomoon is broadly excluded, with upper limits probing down to a Ganymede-sized moon.

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Zhao, Fang, Lee-Fang Chow, Min-Tang Li, Ike Ubaka, and Albert Gan. "Forecasting Transit Walk Accessibility: Regression Model Alternative to Buffer Method." Transportation Research Record: Journal of the Transportation Research Board 1835, no. 1 (January 2003): 34–41. http://dx.doi.org/10.3141/1835-05.

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A description is given of a methodology for estimating transit walk accessibility at the home end of transit trips and for forecasting transit walk accessibility at the home end for a future year, given forecast population and employment data, transit route information, and type of street configuration. The methodology for estimating transit walk accessibility overcomes the problems associated with natural and man-made barriers such as water bodies and community walls and the problem of uneven distribution of population. A comparison of the results with those from the traditional buffer method, as well as with network ratio methods that consider actual walk distance along streets, showed that both the buffer method and network ratio methods tended to overestimate transit walk accessibility. Regression analysis also showed that the new transit walk accessibility measure was a stronger predictor of transit use than that produced using the buffer method. The methodologies may be applied to transit planning, urban design for sustainable development, and long-range transit demand modeling.

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Heller, René, and Michael Hippke. "Signal preservation of exomoon transits during light curve folding." Astronomy & Astrophysics 657 (January 2022): A119. http://dx.doi.org/10.1051/0004-6361/202142403.

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In the search for moons around extrasolar planets (exomoons), astronomers are confronted with a stunning observation. Although 3400 of the 4500 exoplanets were discovered with the transit method and although there are well over 25 times as many moons than planets known in the Solar System (two of which are larger than Mercury), no exomoon has been discovered to date. In the search for exoplanet transits, stellar light curves are usually phase-folded over a range of trial epochs and periods. This approach, however, is not applicable in a straightforward manner to exomoons. Planet-moon transits either have to be modeled in great detail (including their orbital dynamics, mutual eclipses, etc.), which is computationally expensive, or key simplifications have to be assumed in the modeling. One such simplification is to search for moon transits outside of the planetary transits. The question we address in this report is how much in-transit data of an exomoon remains uncontaminated by the near-simultaneous transits of its host planet. We develop an analytical framework based on the probability density of the sky-projected apparent position of an exomoon relative to its planet and test our results with a numerical planet-moon transit simulator. For exomoons with planet-moon orbital separations similar to the Galilean moons, we find that only a small fraction of their in-transit data is uncontaminated by planetary transits: 14% for Io, 20% for Europa, 42% for Ganymede, and 73% for Callisto. The signal-to-noise ratio (S/N) of an out-of-planetary-transit folding technique is reduced compared to a full photodynamical model to about 38% (Io), 45% (Europa), 65% (Ganymede), and 85% (Callisto), respectively. For the Earth’s Moon, we find an uncontaminated data fraction of typically just 18% and a resulting S/N reduction to 42%. These values are astonishingly small and suggest that the gain in speed for any exomoon transit search algorithm that ignores the planetary in-transit data comes at the heavy price of losing a substantial fraction of what is supposedly a tiny signal in the first place. We conclude that photodynamical modeling of the entire light curve has substantial, and possibly essential, advantages over folding techniques of exomoon transits outside the planetary transits, in particular for small exomoons comparable to those of the Solar System.

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Dong, Kailing. "Analysis of Urban Rail Transit Station Planning Combining Simulated Annealing Algorithm." Discrete Dynamics in Nature and Society 2022 (March 7, 2022): 1–8. http://dx.doi.org/10.1155/2022/3941554.

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As a crucial node in the network system of urban transportation infrastructure, the consistent planning of the urban rail transit stations scientifically and reasonably is of highly significant importance to have a thorough understanding of the functional area division of a city and assess the improvement of facilities correlated with the rail transit infrastructure. In this study, the simulated annealing algorithm (SAA) is applied to the data analysis of the rail transit stations in a city. The method for the analysis of the urban rail transit stations combined with the SAA can achieve the dimensionality reduction in high-dimensional data information and the assessment of the similarity in traffic rail transits effectively. Finally, through in-depth analysis of the daily passenger flow features and the spatial location distribution of each type of station, a valuable reference can be obtained for the planning and design of urban rail transit stations.

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Rozprawy doktorskie na temat "Transit method"

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Koppenhoefer, Johannes. "Searching for extra-solar planets with the transit method." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-106531.

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Gattolin, Elena. "Merge in Transit, a distribution method in the industrial environment." Thesis, Jönköping University, JTH, Industrial Engineering and Management, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-1334.

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<p>In a fast moving environment and in a globalized market, companies are searching efficient distribution methods that enable broad product assortment, lower level of inventories, shorter customer order fulfilment, lower transportation costs in order to achieve a more efficient procurement process and a improved customer service. This paper will focus on a new solution in supply chain design to solve these trade-offs between management cost cutting and higher customer level within markets characterized by an increasing globalisation. Merge in transit (MIT) distribution method allows companies to reduce inventory and transportation costs while guaranteeing a high customer perceived service level. It is a new technique in which goods shipped from several supply locations are consolidated into one final customer delivery. The company needs to coordinate shipments so that they arrive simultaneously and goods can be bundled and shipped immediately to the final customer for arrival on due date. Economical benefits and drawbacks will be investigated from a supply chain prospective.</p>

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Alsubai, Khalid. "Wide angle search for extrasolar planets by the transit method." Thesis, St Andrews, 2008. http://hdl.handle.net/10023/521.

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Chen, Lijuan. "An efficient method to compute shortest paths in real road network /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20CHEN.

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Goodloe, John Bennett. "STANDARDIZED SUB-SCALE DYNAMOMETER SCALING METHOD FOR TRANSIT AND FREIGHT TRAIN APPLICATIONS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1899.

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AN ABSTRACT OF THE THESIS OF John Goodloe, for the Master of Science degree in Mechanical Engineering, presented on April 13, 2016, at Southern Illinois University Carbondale. TITLE: STANDARDIZED SUB-SCALE DYNAMOMETER SCALING METHOD FOR TRANSIT AND FREIGHT TRAIN APPLICATIONS MAJOR PROFESSOR: Dr. Peter Filip Dynamometers are machines that are used in several industries for measuring force, torque, or power of a mechanism. These devices are in fact very useful in the friction material industry. Friction materials are created and then tested on dynamometers to analyze physical properties such as the dynamic coefficient of friction of the material based upon its retarding force against the wheel or disc, which is mounted to the dynamometer drive shaft. Dynamometer testing is expensive and often time consuming. Sub-scale dynamometers may be used to reduce cost, time, and material use while providing similar test results by implementing a proper scaling method. There are several scaling methods, but this approach will use surface analysis and the energy dispersed per surface contact area strategy to verify the testing conditions of both sub-scale and full scale testing. Since lab analysis costs are expensive, the project budget is restricted to analyzing the maximum of 1 full-scale disc and pad specimen and 2 subscale disc and pad sets. The test results are expected to prove that when the surface conditions of the analyzed specimens agree to each other, the dynamometer test results will also agree. Due to restrictions with budget and time the fastest and most effective way to test this hypothesis is by creating the baseline on the full-scale and then adjusting the scaling on the subscale dynamometer until similar results are given. Once similar dynamometer test results are obtained, the material specimens can be analyzed in the lab. Testing will continue as long as necessary, and if the expected results are not obtained, the results will still be tested for analysis and compared to the baseline. The results are expected to show that two separate machines may provide similar surface conditions for testing, as well as similar dynamometer test results for any given friction material. However, if the expected results cannot be obtained, then it may still prove that without matching the surface layer conditions while testing, the dynamometers recorded test results will not match either, which is in agreeance with the hypothesis.

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Lee, Sui-chun Macella. "The impact of Mass Transit Railway on land development in Hong Kong an analysis of the island line using expansion method /." Click to view the E-thesis via HKUTO, 1989. http://sunzi.lib.hku.hk/hkuto/record/B42574146.

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Hughes, Arthur D. "Analysis of in-transit visibility as a method of reducing material lost in shipment." Monterey, California. Naval Postgraduate School, 1994. http://hdl.handle.net/10945/30913.

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The purpose of this thesis is to evaluate the impact that improved in-transit visibility, obtained through implementation of the Defense Total Asset Visibility {DTAV) plan a11d the Global Transportation Network (GTN), will ha\'e on reducing material lost in shipment. This research utilizes financial data generated aboard Navy ships outfitted with the Shipboard Uniform Automated Data Processing System (SUADPS) to determine the extent of material lost in shipment and to e\•aluate the possible savings that could be derived through improving material visibility at the requisitioncr (user) level. The exisJing methods used to track material arc reviewed, weaknesses and deficiencies arc identified, potential savings are analyzed using linear regression analysis. The Defense Total Asset Visibility Plan (DTAV) and Global Transportation Network (GTN) arc introduced, and available methods of accessing improved intransit visibility data arc discussed. This analysis concludes that improved in-transit visibility can re<luce material lost in shipment through better control of assets in the transportation pipeline and improved receipt processing at receiving activities.

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Naylor, A. Ross. "Evaluation and clinical application of a new method of quantifying mean cerebral transit time." Thesis, University of Aberdeen, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240668.

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Recent work using Positron Emission Tomography has indicated that the best indicator of cerebral vascular reserve (CVR) is the ratio of cerebral blood flow to cerebral blood volume, which is the reciprocal of mean cerebral transit time (MCTT). However, previous attempts to quantify MCTT have ben unsuccessful. A new isotopic method of quantifying MCTT, which has overcome previous problems, is described and has been subjected to validation and application in two studies: (i) in patients with acute stroke, (ii) in patients undergoing carotid endarterectomy. In the validation study, MCTT was compared with blood flow velocity in the middle cerebral artery, using Transcranial Doppler (TCD) sonography. Both methods were reproducible and there was a linear relationship between MCTT and inter-hemispheric MCTT asymmetry has been defined. The transit time and TCD methods were employed in 32 patients with acute, first-time cerebral infarction. Patterns of underlying vascular pathology correlated with a clinical and CT scan/autopsy classification of cerebral infarction and there was good correlation between the transit time and TCD findings. The new technique, when applied to 55 patients undergoing carotid endarterectomy, showed that 31% had pre-operative evidence of impaired CVR in the symptomatic hemisphere, 75% returning to normal after surgery. Significant predictors for intra-operative sroke were; (i) age over 65, (ii) residual neurological deficit, (iii) complex plaque morphology, (iv) the combination of impaired CVR and CT infarction in the symptomatic hemisphere. No patient with recurrent symptoms after carotid endarterectomy has developed impaired CVR or recurrent disease in the operated internal carotid artery (ICA) during follow-up. One patient has developed impaired CVR in the non-operated hemisphere in association with disease progression in the non-operated ICA. The transit time method shows considerable potential as an inexpensive, quick and simple alternative to the previously available methods of evaluating CVR.

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Damasso, Mario. "An M dwarf planet search programme using the photometric transit method: implementation of a new ground-based survey." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423486.

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This work describes the most relevant steps undertaken for the development and installation of the survey APACHE (A PAthway toward the Characterization of Habitable Earths), and some of the main results obtained after the first observing season are presented. APACHE is the first long-term observing campaign based in Europe which is devised expressly for detecting extrasolar planets orbiting well selected, nearby M dwarfs by using the photometric transit method. The project was conceived at the end of 2008 and he survey makes use of an array of five automated 40 cm telescopes which started routine observations between July 2012 and March 2013. In the Thesis introduction some key issues are discussed which in the last years have placed the cool stars at the centre of the planet hunters’ interests, producing an increase in the number of photometric and high resolution spectroscopic surveys targeted on red dwarfs. In Chapters 1 and 2 the milestones which led to the preparation and initial design of APACHE are presented (the feasibility and pilot study), while Chapter 3 is focused on the description of the most relevant characteristics of the survey structure, as the accurate definition of the catalogue of eligible targets (the APACHE Input Catalogue) and observing strategy, and the implementation of the software package used for obtaining and analyzing the light curves. In Chapter 4 the preliminary results obtained after the first observing season at regime are presented and discussed, with the analysis mainly focused on the study of the photometric variability of more than 130 M dwarfs. Three targets showed evidence of stellar flares, and rotation periods have been measured for five stars through the analysis of their light curve periodograms. A simple single-spot model has been applied to the time series of these stars to describe the observed sinusoidal-like modulation in terms of stellar spots/active regions, obtaining in particular an estimate of the spin-axis inclination angle relative to the line of sight. The Chapter ends with a presentation of more than 90 new variable stars discovered in the stellar fields observed by the APACHE telescopes during the first year. The Thesis concludes with Chapter 5, where the strategic synergy established between APACHE and the large National observing programme GAPS (Global Architecture of Planetary Systems) is described. GAPS observations are carried out with the high resolution spectrograph HARPS-N at the Telescopio Nazionale Galileo (TNG, @ La Palma island in the Canary archipelago) for an extensive study in the field of extrasolar planets. Among the goals of GAPS, of particular relevance is the detection of planets orbiting M dwarfs by analyzing the time variations of the stellar radial velocities, and in Chapter 5 preliminary results are presented for a sample of targets in common with the APACHE project. In particular, it is highlighted the importance of having photometric light curves as a support for a correct interpretation of periodical signals found in the radial velocity time series which could be due to the gravitational effects induced on the star by a planetary mass companion. The results discussed in this Thesis should demonstrate how effectively a large photometric database such that of APACHE is expected to contribute to both the exoplanet science and the physics of the cool stars<br>In questo lavoro sono descritti i passi più importanti che hanno portato allo sviluppo e alla messa in funzione della survey APACHE (A PAthway toward the Characterization of Habitable Earths), e vengono presentati alcuni dei principali risultati ottenuti dopo la prima stagione osservativa. APACHE è la prima campagna osservativa di lunga durata con base in Europa finalizzata alla ricerca di pianeti in orbita attorno a stelle nane rosse nelle vicinanze del Sole accuratamente selezionate, utilizzando il metodo fotometrico del transito. Il progetto è stato concepito alla fine del 2008 e la schiera di cinque telescopi automatici di 40 cm di diametro utilizzati per le ricerche sono entrati in funzione tra luglio 2012 e marzo 2013. L’introduzione presenta alcuni aspetti chiave che negli ultimi anni hanno portato le nane rosse al centro degli interessi dei cacciatori di mondi alieni, determinando la crescita del numero di campagne osservative dedicate al monitoraggio delle stelle pi`ù fredde, sia fotometricamente che tramite spettroscopia ad alta risoluzione. Vengono poi ripercorse le tappe fondamentali che sono servite per preparare e definire il design iniziale della survey APACHE (studio di fattibilità e studio pilota, discussi nei Capitoli 1 e 2), mentre il Capitolo 3 si concentra sulla descrizione delle caratteristiche più rilevanti dell’impianto della campagna osservativa, come la definizione del catalogo con i potenziali target osservativi (APACHE Input Catalogue) e della strategia osservativa, e la costruzione del software utilizzato per ottenere e analizzare le curve di luce. Nel Capitolo 4 sono presentati i risultati preliminari ottenuti dopo il primo anno di osservazioni a regime, e l’analisi si concentra soprattutto sullo studio della variabilità fotometrica di oltre 130 nane rosse. Tre target hanno mostrato evidenza di brillamenti stellari, e sono stati misurati periodi di rotazione attorno al proprio asse di cinque stelle attraverso l’analisi dei periodogrammi relativi alle loro curve di luce. Alle serie temporali fotometriche di queste stelle è stato applicato un semplice modello a singola macchia per descrivere la modulazione quasi-sinusoidale osservata in termini di macchie stellari/regioni attive, ottendo in particolare una stima dell’angolo di inclinazione dell’asse di rotazione rispetto alla linea di vista. Il Capitolo si conclude con la presentazione di più di 90 nuove stelle variabili scoperte da APACHE nel corso del primo anno. Il lavoro si chiude con il Capitolo 5, dove viene descritta la strategica sinergia instaurata tra il progetto APACHE e l’esteso programma osservativo nazionale GAPS (Global Architecture of Planetary Systems) che fa uso dello spettrografo ad alta risoluzione HARPS-N montato al Telescopio Nazionale Galileo (Isola di La Palma, arcipelago delle Canarie) per ricerche nell’ambito dei pianeti extrasolari. Tra gli obiettivi di GAPS c’è quello di scoprire pianeti in orbita attorno a nane rosse attraverso l’analisi delle variazioni temporali delle velocità radiali stellari, e il Capitolo 5 presenta i risultati preliminari ottenuti per i target in comune con il progetto APACHE. In particolare, viene sottolineata l’importanza delle serie temporali fotometriche come aiuto per una corretta interpretazione di segnali periodici trovati nelle serie temporali di velocità radiali che potrebbero essere dovuti agli effetti gravitazionali indotti sulla stella da un compagno di massa planetaria. I risultati discussi in questa Tesi dovrebbero dimostrare l’importante contributo che un ricco archivio di dati come quello prodotto dalla survey APACHE potrà assicurare sia alla scienza dei pianeti extrasolari che allo studio delle nane rosse

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Gee, Wilfred T., Olivier Guyon, Josh Walawender, Nemanja Jovanovic, and Luc Boucher. "Project PANOPTES: a citizen-scientist exoplanet transit survey using commercial digital cameras." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622806.

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Project PANOPTES (http://www.projectranoptes.org) is aimed at establishing a collaboration between professional astronomers, citizen scientists and schools to discover a large number of exoplanets with the transit technique. We have developed digital camera based imaging units to cover large parts of the sky and look for exoplanet transits. Each unit costs approximately $5000 USD and runs automatically every night. By using low-cost, commercial digital single-lens reflex (DSLR) cameras, we have developed a uniquely cost-efficient system for wide field astronomical imaging, offering approximately two orders of magnitude better etendue per unit of cost than professional wide-field surveys. Both science and outreach, our vision is to have thousands of these units built by schools and citizen scientists gathering data, making this project the most productive exoplanet discovery machine in the world.

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Książki na temat "Transit method"

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Kuhn, Gerhard. Application of a stream-aquifer model to Monument Creek for development of a method to estimate transit losses for reusable water, El Paso County, Colorado. Reston, Va: U.S. Geological Survey, 2006.

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Ferrell, Christopher E., Bruce S. Appleyard, Matthew Taecker, Chris Allen, Courtney Armusewicz, and Caleb Schroder. Livable Transit Corridors: Methods, Metrics, and Strategies. Washington, D.C.: Transportation Research Board, 2016. http://dx.doi.org/10.17226/23630.

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Miller, Eric J. Recent trends in transit service planning analysis methods. [Toronto: s.n., 1986.

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Reinke, David. Transit fare prepayment distribution methods in Sacramento, CA. [Washington, D.C.]: U.S. Dept. of Transportation, Urban Mass Transportation Administration, 1985.

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Boyle, Daniel K. Fixed-route transit ridership forecasting and service planning methods. Washington, D.C: Transportation Research Board, 2006.

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Zalewski, Andrew, Daniel Sonenklar, Alexandra Cohen, Josie Kressner, and Gregory Macfarlane. Public Transit Rider Origin-Destination Survey Methods and Technologies. Washington, D.C.: Transportation Research Board, 2019. http://dx.doi.org/10.17226/25428.

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Schweiger, Carol L. Methods of rider communication: A synthesis of transit practice. Washington, D.C: Transportation Research Board, 2006.

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S, Koppelman Frank, Schnaiberg Allan, Schofer Joseph L. 1941-, Illinois Universities Transportation Research Consortium., and Illinois Regional Transportation Authority, eds. Design of a strategic transit market research program. Chicago, Ill: Illinois Universities Transportation Research Consortium, 1989.

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Nuzzolo, Agostino. Transit network modelling: The schedule- based dynamic approach. Milano: F. Angeli, 2003.

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Peterson, Del. Transit ridership and the built environment. Fargo, ND]: Mountain-Plains Consortium, 2011.

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Części książek na temat "Transit method"

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Kristianingtyas, Klara Dwi, and Masafumi Miyatake. "Design of Optimal Train Speed Profile for PMSM Railway Traction System Using Dynamic Programming with MTPA Control Method." In Urban Rail Transit, 291–309. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5979-2_17.

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Deeg, Hans J., and Roi Alonso. "Transit Photometry as an Exoplanet Discovery Method." In Handbook of Exoplanets, 1–25. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-30648-3_117-1.

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Deeg, Hans J., and Roi Alonso. "Transit Photometry as an Exoplanet Discovery Method." In Handbook of Exoplanets, 633–57. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-55333-7_117.

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Deeg, Hans J., and Roi Alonso. "Transit Photometry as an Exoplanet Discovery Method." In Handbook of Exoplanets, 1–31. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-319-30648-3_117-2.

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Fidanzio, A., S. Cilla, F. Greco, L. Azario, L. Grimaldi, D. Sabatino, and A. Piermattei. "EPID calibration method for transit in-vivo dosimetry." In IFMBE Proceedings, 399–402. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03474-9_112.

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Ma, Haiyue, Jun Liu, and Xinyue Xu. "Evaluation Method of Urban Rail Transit Hub Resilience." In Lecture Notes in Civil Engineering, 342–50. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-9640-3_39.

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Vuong, Le Luong, Tran Duc Quynh, and Nguyen Quang Thuan. "A New Solution Method for Solving Transit Assignment Problems." In Advances in Engineering Research and Application, 70–76. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-04792-4_11.

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McGruder, Charles H., Steve B. Howell, and Mark E. Everett. "The Detection of Extrasolar Planets via the Transit Method." In Astrophysics and Space Science Library, 809–23. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0253-0_58.

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Polimeni, Antonio, and Antonino Vitetta. "A Method for Topological Transit Network Design in Urban Area." In Advances in Intelligent Systems and Computing, 151–61. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04630-3_12.

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Hou, Yiyu, Honghui Dong, and Limin Jia. "A Study on the Forecast Method of Urban Rail Transit." In Proceedings of the 2015 International Conference on Electrical and Information Technologies for Rail Transportation, 365–72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49370-0_38.

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Streszczenia konferencji na temat "Transit method"

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Wang, Shisheng, Chengxin Du, Yukun Meng, Li Bai, Fan Gao, and Yujing Cai. "Emergency recognition method for rail transit based on TextCBAM network." In Eighth International Conference on Traffic Engineering and Transportation System (ICTETS 2024), edited by Xiantao Xiao and Jia Yao, 226. SPIE, 2024. https://doi.org/10.1117/12.3054778.

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Zhang, Guangcai, Jianrui Miao, Sihui Long, Jing Cai, Yunpeng Wu, and Hongyun Li. "A Passenger-oriented Train Scheduling Optimization Method for Tourism Rail Transit System." In 2025 IEEE International Conference on Industrial Technology (ICIT), 1–5. IEEE, 2025. https://doi.org/10.1109/icit63637.2025.10965267.

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Xie, Zixian. "Research on the Impact of Transit-Oriented Development Method on Urban Transport." In International Conference on Modern Logistics and Supply Chain Management, 86–92. SCITEPRESS - Science and Technology Publications, 2024. https://doi.org/10.5220/0013234000004558.

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Duff-Riddell, Wayne. "A Practical Transit Network Design Method." In Second International Conference on Transportation and Traffic Studies (ICTTS ). Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40503(277)35.

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Yonggang Zhu, Shuzhi Zhao, and Lianfu Zhang. "New optimization method for urban transit network-CVO method." In 2008 IEEE International Conference on Service Operations and Logistics, and Informatics (SOLI). IEEE, 2008. http://dx.doi.org/10.1109/soli.2008.4682964.

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Zhao, Fang, and Ike Ubaka. "Transit Network Optimization—A Systematic Search Method." In Eighth International Conference on Applications of Advanced Technologies in Transportation Engineering (AATTE). Reston, VA: American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/40730(144)55.

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Zhang, Yan, and Ningchuan Li. "Rail Transit Early Warning Method Based on SVM." In 2022 6th Asian Conference on Artificial Intelligence Technology (ACAIT). IEEE, 2022. http://dx.doi.org/10.1109/acait56212.2022.10137899.

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Wang, Lili. "Location method of transit station for rail transit based on variable step size any colony algorithm." In 6th International Conference on Computer Information Science and Application Technology (CISAT 2023), edited by Shijie Jia and Huajun Dong. SPIE, 2023. http://dx.doi.org/10.1117/12.3004793.

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Yang, Jie, Yongshi Xu, and Ruihua Xu. "Optimization method of Urban Rail Transit train running scheme." In 2011 IEEE International Conference on Cloud Computing and Intelligence Systems (CCIS). IEEE, 2011. http://dx.doi.org/10.1109/ccis.2011.6045140.

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Han, Yanzhao, and Zhibin Jiang. "Actual Timetable Data Cleaning Method in Rail Transit Lines." In 17th COTA International Conference of Transportation Professionals. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784480915.032.

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Raporty organizacyjne na temat "Transit method"

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Kress, Marin, Patricia DiJoseph, Morgan Johnston, Brian Tetreault, James Kilroy, Brady Towne, Andrew Smith, David Sathiaraj, and Andy Van Pelt. A method for evaluating Automatic Identification System (AIS) coverage on select inland waterways in 2020 and 2021 : Upper Mississippi River, Illinois River, and Ohio River. Engineer Research and Development Center (U.S.), November 2023. http://dx.doi.org/10.21079/11681/47839.

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The Automatic Identification System (AIS) shares vessel position information for navigational safety purposes. AIS broadcasts are received by other ships and terrestrial stations; however, in some areas there is no, or low, terrestrial station coverage to receive broadcasts. The US Army Corps of Engineers (USACE) developed an Online Travel Time Atlas (OTTA) to process AIS data and derive a transit count. This study examined OTTA output from 2020 and 2021 to identify areas of high or low AIS coverage along the Upper Mississippi, Illinois, and Ohio Rivers. Segments with a yearly average of two or more transit per day were classified as high coverage, those with less than a yearly average of two transits per day were classified as low coverage. Rivers were segmented using the USACE National Channel Framework reach boundaries. Results based on calculated vessel transits were as follows: Upper Mississippi River: 837.4 miles (98%) had high coverage, with 17.4 miles (2%) of low coverage; Illinois River: 190.5 miles (59%) had high AIS coverage, and 133 miles (41%) had low AIS coverage; Ohio River: 644 miles (66%) had high coverage, and 337 miles (34%) had low coverage. AIS coverage could be improved by raising antennae heights, installing repeater equipment, or adding towers.

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Godavarthy, Ranjit. Developing a Method for Assessing National Demand-Response Transit Level of Service. Tampa, FL: University of South Florida, October 2015. http://dx.doi.org/10.5038/cutr-nctr-rr-2015-05.

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Newmark, Gregory L. Measurement and Prediction of Transit System Performance Using Probe Data Generated through DSRC and non-DSRC Technologies. Mineta Transportation Institute, October 2024. http://dx.doi.org/10.31979/mti.2024.2008.

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This research explores the application of two different probe data standards to transit performance measurement. The first section chronicles the proposed and implemented transit uses of dedicated short-range communication (DSRC) technologies during the two decades between the standard’s emergence and its announced sunset. The research finds that, despite proposed applications across safety, operation, and information domains, DSRC never became embedded in transit operations. By contrast, the general transit feed specification (GTFS) standard with its real-time (RT) extension has been widely embraced and offers the potential to use the associated VehiclePosition messages as probe data to generate detailed transit performance metrics. The second section presents a method to decompose transit routes into segments (defined as the path between subsequent stops) and to impute three key time points for each segment: arrival time at the segment start, departure time from the segment start, and arrival time at the segment end. This method is applied to several days of GTFS-RT data from the Modesto Area Express to assess the accuracy of the imputation (in comparison to reported times from the TripUpdate messages) and, in the third and final section, to generate and visualize a series of performance metrics. These metrics assess the deviation between the designed travel times from the GTFS Schedule data and the actual travel times imputed from the GTFS-RT feeds. The research demonstrates an innovative approach to transform probe data generated by GTFS-RT feeds into valuable measures of transit performance at segment-level granularity. The research emphasizes the importance of segment-level transit performance measurement while recognizing that the methods used to impute segment time points are likely to change over time as the GTFS-RT standard evolves.

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Mohammadian, Abolfazl, Mohammad Miralinaghi, Alireza Talebpour, Sajad Askari, and Sanaz Kazemzadehazad. State Department of Transportation Support for Operationalizing Transit Signal Priority. Illinois Center for Transportation, June 2025. https://doi.org/10.36501/0197-9191/25-005.

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Transit signal priority (TSP) systems have become an integral part of regional intelligent transportation systems integration. They modify signal operations to facilitate faster transit through intersections, improve transit service reliability, reduce delays, and enhance overall transit operational efficiency. Agencies are planning and implementing next-generation TSP systems. However, multifaceted challenges complicate TSP implementation, particularly in urban regions with high traffic density and multiple stakeholders. Exploring these challenges can help develop more efficient deployment strategies and improve system performance. This study’s researchers, therefore, examined TSP implementation challenges in the metropolitan Chicago area and interviewed stakeholders and experts from Illinois and other states to identify successes and obstacles in TSP deployment. They applied a thematic analysis and a non-negative matrix factorization method to identify key barriers. To prioritize these challenges, they developed a survey using the fuzzy analytic hierarchy process framework and had experts directly involved in TSP operations in the Chicago region participate in this survey. Study findings indicated that organizational factors—such as interagency coordination issues and labor shortages—are significant challenges. Regulatory and policy constraints, including the absence of standardized regional guidelines and concerns over equipment compatibility, further hinder TSP deployment. Financial constraints, particularly the reliance on fragmented funding sources, create uncertainty in project execution. Technological limitations, such as integration difficulties with legacy traffic control systems and the high costs of infrastructure upgrades, also impede implementation.

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Shaheen, Susan, Elliot Shaheen, Adam Cohen, Jacquelyn Broader, and Richard Davis. Managing the Curb: Understanding the Impacts of On-Demand Mobility on Public Transit, Micromobility, and Pedestrians. Mineta Transportation Institute, July 2022. http://dx.doi.org/10.31979/mti.2022.1904.

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In recent years, innovative mobility and shifts in travel and consumption behavior are changing how people access and use the curb. Shared mobility—the shared use of a vehicle, bicycle, scooter, or other mode—coupled with outdoor dining, curbside pick-up, and robotic delivery are creating new needs related to the planning, management, and enforcement of curb access. This study examines curb planning and management from several angles, such as safety, social equity, and multimodal connections. This research employs a multi-method approach to identify the changing needs for curb space management and how to meet these needs through new planning and implementation policies and strategies. As part of this study, the authors conducted 23 interviews. Respondents were chosen to represent public, private, and non-profit sector perspectives. Additionally, the authors employed a survey of 1,033 curb users and 241 taxi, transportation network company (TNC), and public transportation drivers. The study finds that changes in mode choice and curbside use can result in a variety of impacts on access, social equity, congestion, device management, pick-up and drop-off, and goods delivery, to name a few. The curb also has the potential to be disrupted by emerging modes, such as robotic delivery vehicles (also known as personal delivery devices) and automated vehicles. As these emerging developments continue to impact the curb, it is becoming increasingly important for policymakers to have an appropriate framework for planning and managing curb space in urban areas.

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Ferrell, Christopher E., John M. Eells, David Reinke, and Richard Lee. Metropolitan Transportation Commission Discretionary Transit Funding Methods Evaluation. Mineta Transporation Institute, October 2023. http://dx.doi.org/10.31979/mti.2023.2133.

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In 2021, the Santa Clara Valley Transportation Authority (VTA) approached the Mineta Transportation Institute (MTI) with a proposal to have MTI provide an evaluation of the Metropolitan Transportation Commission’s (MTC’s) operational discretionary funding allocation policies and methods for Bay Area transit operators. The research was done in two parts. Part 1 investigated MTC’s past and current allocation methods for discretionary operational transit funding programs; Part 2 involved the evaluation of outcomes if MTC employed alternative allocation methods. After the Part 1 review of MTC’s various transit funding programs, the federal pandemic relief funds and the Transportation Development Act/State Transit Assistance (TDA/STA) funding programs were selected and evaluated in Part 2 using a set of five alternative allocation metrics and compared to actual MTC allocations. Key findings include: (1) the population-based metric produced the largest increase for VTA’s pandemic relief funds, with VTA receiving 221 percent more than MTC actually allocated in 2020 and 2021, but the San Francisco Municipal Transportation Agency (SFMTA) receiving 64 percent less; (2) the ridership-based metric yielded the smallest amount of VTA pandemic funding, but high ridership operators such as SFMTA would have a 41 percent increase; (3) the population-based metric produced the largest increase in STA funding to VTA but would come at the expense of other transit operators, with Sonoma County receiving 51 percent less; and (4) the ridership-based metric yielded the smallest amount of STA funds for VTA, with 50 percent less funding than actual, while high ridership operators such as SFMTA, would see a roughly 400 percent increase. Thoroughly investigating current and alternative funding allocation methods and policies is critical to understanding their effects on transit agencies and the communities they serve.

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Atkinson-Palombo, Carol, Rosalie Ray, and Norman Garrick. Transit Oriented Development for a More Climate Resilient Connecticut: Challenges and Opportunities in Fairfield and New Haven Counties. UConn Connecticut Institute for Resilience and Climate Adaptation, June 2021. http://dx.doi.org/10.56576/bjsz6468.

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Over the past decade, Connecticut has made a strong push for transit-oriented development (TOD). In some parts of the state, however, TOD is as much returning to past forms of urbanism as building anew, as cities along the Metro-North New Haven Main Line were largely developed before the car. Using a mixed methods approach of document review, stakeholder interviews, and geospatial analysis, we studied challenges and obstacles to TOD along the Metro-North New Haven Main Line. Several station areas, TOD zones, and track sections are within CIRCA's 1% 2050 flood projections for sea level rise. While none of the top 200 bus stops are among the 192 CT Transit stops in the flood zone, 45 federally subsidized affordable housing complexes included in the National Housing Preservation Database (NHPD) are within 60-ft of the 1% flood in 2050. This project produced a detailed geodatabase of land use around transit stations; assessment of obstacles and potential of TOD, and best practices recommendations.

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Moore, Kathleen, Emilie Ellenberg, Melissa Carlson, Jodi Godfrey, and Lisa Staes. Understanding the Prevalence of Mental Health and Behavioral Distress in Transit Assaults and Presenting Targeted Response and Mitigation Methods to Reduce Victimization Trends. Mineta Transportation Institute, February 2025. https://doi.org/10.31979/mti.2024.2407.

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This research project was performed to better understand the prevalence of mental health and behavioral distress in transit assaults and present corresponding targeted response and mitigation methods to reduce victimization trends. It includes a literature review, a data presentation and overview of reported public transit assault-related events, an examination of the contributing factors to those events, and documentation of 10 transit agency case studies. The literature review discusses some of the misconceptions of mental illness and associated stigmas and discrimination that can occur in response to these misconceptions. It discusses various approaches and strategies that transit agencies have used to prepare transit vehicle operators and other frontline workers to better recognize mental health presentations and engage appropriately. It also highlights evidence-based practices that transit agencies can use to better prepare their systems and provide tools employees can use to better communicate with individuals who may be having mental health-related episodes. The research team gathered additional data from case study sites, including the methods used to address assault-related challenges and the successful community engagement and partnerships, which are documented in this report. The report provides findings and policy and practice recommendations.

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Hayes, R. R., A. Williams, J. Ireland, and K. Walkowicz. King County Metro Transit: Allison Hybrid Electric Transit Bus Laboratory Testing. Office of Scientific and Technical Information (OSTI), September 2006. http://dx.doi.org/10.2172/893005.

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Chandler, K., and K. Walkowicz. King County Metro Transit Hybrid Articulated Transit Buses: Interim Evaluation Results. Office of Scientific and Technical Information (OSTI), April 2006. http://dx.doi.org/10.2172/882190.

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