I'm a Dinosaur

Ruth Symons

10 valutazioni di Goodreads

Lingua: inglese

Editore: Candlewick Press, 2025

153624323X / 9781536243239

Serie: Libro 2 di 6 - I'm A... Shaped Board Book Series

Da: World of Books (was SecondSale), Montgomery, IL, U.S.A.World of Books (was SecondSale)

Venditore con 5 stelle

Venditore AbeBooks dal 20 dicembre 2007

Rilegato

Condizione: Usato - Discreto

EUR 4,51

 Spedizione gratuita 
Spedito in U.S.A.

Quantità: 1 disponibile

Aggiungi al carrello
Resi gratuiti per 30 giorni

Descrizione dell’articolo da parte del venditore

As an essential component of the ballast track, the ballast layer provides functionali-ties such as drainage, load distribution, as well as strength and stability for the rail-way track. The mechanical behaviors of ballast track such as its permanent settle-ment, breakage, force propagation and void ratio are in a great extent influenced by the form distribution of ballast stones. Its reasonable design will greatly improve the mechanical behaviors, and thus prolong the maintenance cycle of ballast track, or reduce the number of ballast stones needed for construction. This dissertation focuses on proposing optimized ballast stones in the ballast aggre-gate in regard to their geometrical forms. As the first step, a ballast random form gen-erator, which is designed to generate ballast form databases with different form dis-tributions, is proposed. 15 databases are created for further usage. Afterwards, Dis-crete Element Method (DEM) based simulations are performed to investigate the mechanical behaviors of ballast aggregates. The simulation model is established based on a box test, whose result is presented firstly. Establishment and calibration process of the model are expatiated afterwards. A parameter study regarding to cru-cial modeling parameters is also performed. Using the validated parameters and the 15 generated form databases, DEM simulation models with different form distribu-tions of ballast stones in the ballast aggregate are proposed. Simulative methods to quantify the mechanical behaviors are elaborated. Based on the obtained results, the interrelation between mechanical behaviors of ballast aggregate and the form effect on mechanical behavior of the ballast aggregates are studied. The optimized ballast aggregate is proposed based on the findings stated above. The proposed optimized ballast aggregate is expected to be a reference for construc-tion of ballast track in real world. The modeling technic and the calibrated modeling parameters can be used fo.…

Codice articolo 00105463903

Titolo
I'm a Dinosaur
Autore
Ruth Symons
Editore
Candlewick Press
Anno di pubblicazione
2025
Condizione
Fair
Rilegatura
Hardback
Lingua
inglese
ISBN 10
153624323X
ISBN 13
9781536243239
Disegnatore
Scott, Matthew
Serie
Libro 2 di 6: I'm A... Shaped Board Book Series

World of Books (was SecondSale)

Montgomery, IL, U.S.A.

Venditore con 5 stelle

Venditore AbeBooks dal 20 dicembre 2007

Tariffe di spedizione nazionale per U.S.A.

ArticoloDa 4 a 12 giorni lavorativiDa 3 a 6 giorni lavorativi
Primo articoloEUR 0,00EUR 9,78
I tempi di consegna sono stabiliti dai venditori e variano in base al corriere e al paese. Gli ordini che devono attraversare una dogana possono subire ritardi e spetta agli acquirenti pagare eventuali tariffe o dazi associati. I venditori possono contattarti in merito ad addebiti aggiuntivi dovuti a eventuali maggiorazioni dei costi di spedizione dei tuoi articoli.

Metodi di pagamento

  • Visa
  • Mastercard
  • American Express
  • Carte Bleue
  • Apple Pay
  • Google Pay

Descrizione dello Store

Founded in 2002, World of Books is a leading online destination for buying and selling both preloved and new books, committed to making sustainable reading accessible to all. With a mission to help people read more and waste less, World of Books offers a huge range of affordable, high-quality books — giving both new and preloved titles a second life. The company also operates World of Books – Sell Your Books, an easy-to-use platform that allows customers to trade in unwanted books for cash, helping to keep books in circulation while promoting sustainability. As a Certified B Corp, World of Books is driven by a vision to become the world’s largest and most sustainable dedicated online bookstore. The company measures its success through the positive environmental impact it creates, the value it provides to customers, and its ability to operate profitably while supporting its sustainable mission …

Informazioni sull’azienda del venditore

SBYB, Inc.

900 Knell Rd
Montgomery, IL U.S.A. 60538