Wyniki wyszukiwania - BazTech

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Evaluation of near-collisions in the Tagus River Estuary using a marine traffic simulation model

Rong H., Teixeira A., Soares C. G.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2015

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nr 43 (115)

68--78

EN

This paper evaluates near ship-ship collision situations in the Tagus River Estuary using a simulation model of ship navigation in restricted waters. The simulation model consists of a ship collision avoidance model based on the Artificial Potential Field (APF) method, which has been improved to account for the lateral distribution of traffic along the route, the ship type and length and speed development of the ships along the trajectory. AIS data of ships entering and leaving the port of Lisbon are analysed to obtain the main characteristics of traffic parameters used as input for the traffic simulation model, such as: the routes of the vessels, speed distribution along the routes, traffic density and characteristics of the ships in each route, among others. First, the improved model of ship navigation and the Monte Carlo simulation technique are used to simulate the marine traffic in the Tagus River Estuary. Then, the concept of “ship domain” is used as collision criterion to determine the number of near collisions and the locations where they are most likely to occur. Finally, the simulation results are compared to the ones obtained from raw AIS data to assess the capability of the simulation model for marine traffic risk analysis.

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Predict manoeuvring indices using AIS data by ridge regression

Mou J., Tang G., Rong H., Yue X.

Zeszyty Naukowe / Akademia Morska w Szczecinie

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2013

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nr 36 (108) z. 2

137--142

EN

The ridge regression is presented for identify manoeuvring indices in Nomoto’s model, and the result indicates that the method is robust and does not rely on initial estimation. For selecting appropriate AIS data for manoeuvring indices predicting, a frequency domain identification method is presented.

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Advances in the thermal bonding of cotton/cellulose acetate nonwovens of untreated and aqueous pre-treated webs

Duckett K. E., Bhat G. S., Gao X., Rong H.

Zeszyty Naukowe. Włókiennictwo / Politechnika Łódzka

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2000

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z. 59

11-16

EN

Discovering new applications for cotton fiber in thermally bonded nonwovens has required the introduction of thermoplastic fibers having low softening temperatures. Finding the appropriate thermoplastic fiber that is both biodegradable/compostable and thermally compatible with cotton is an important consideration. Cellulose acetate is an appropriate choice for this bonding fiber. Our studies indicate that aqueous solutions containing small percentages of acetone lower thermal processing temperatures and significantly enhance properties of thermally calendered nonwovens. More recent studies have investigated the influence of water pretreatment without acetone additive and have shown that thermal processing is positively modified. Comparisons are drawn between the thermal characterization of bond points and with or without pre-treatment of blended webs prior to calendering. Similar comparisons are made on physical properties of the calendered nonwovens fabrics.