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pe and Natural Systems
Published in James F. Pankow, Aquatic Chemistry Concepts, 2018
S(IV)T (i.e.,H2SO3∗+HSO3−+SO32−): S(IV)T cannot have a predominance region in this system. Indeed, the S(IV)T/S(−II)T line (23.93) plots above the S(VI)T/S(−II)T line (23.89). Above line (23.89), including the points along line (23.93), S(VI)T will predominate over S(−II)T. Thus, S(VI)T will predominate over S(IV) along line (23.93). Increasing the pe by going above line (23.93) will only further increase the S(VI)T/S(IV)Tratio. S(IV)T cannot predominate anywhere below line (23.93) since in that region, S(−II)T>S(IV)T.
Hydrogen in Aeronautics
Published in G. Daniel Brewer, Hydrogen Aircraft Technology, 2017
Several other rocket engine manufacturers in the U.S. were concurrently involved in development of designs using LH2. The General Electric Company, the Rocketdyne Division of North American Aviation (now Rockwell International, Inc.), and the Aerojet General Corporation were among the leaders. Of the designs developed by these companies, the Rocketdyne J2 engine, shown in Figure 1–4, is an example which has been eminently successful. It was used in both the second and third stages of the Saturn V launch vehicle, used in the Apollo program which landed U.S. astronauts on the moon. There are five J2s clustered in the Saturn V second stage (called the S-II stage) and one J2 in the third or upper stage (called the S-IVB). The S-II stage has a capacity of about 160,000 lb of LH2, and the S-IVB stage holds approximately 43,000 lb.
An Empirical Spectral Ground-Motion Model for Iran Using Truncated Iranian Strong-Motion Database Enriched by Near-Field Records
Published in Journal of Earthquake Engineering, 2023
A comparison of different predicted models for California and Turkey with proposed model of this work is presented in Fig. 13. The provided models have been compared to the NGA-West2 models of California proposed by Abrahamson, Silva, and Kamai (2014), Boore et al. (2014), Campbell and Bozorgnia (2014) and Chiou and Youngs (2014) as well as the Turkey-Adjusted NGA-West1 (TR-NGA) model developed by Gülerce, Kargoığlu, and Abrahamson (2016), for four scenarios including (I) M7, R10, Vs30 = 760 m/s, (II) M7, R10, Vs30 = 270 m/s, (III) M5, R10, Vs30 = 760 m/s, (IV) M5, R10, Vs30 = 270 m/s. In the first scenario, the current model is somewhat similar to the ones proposed by Campbell and Bozorgnia (2014) and Kale et al. (2015) at periods between 0.05 and 0.2 s. In the second scenario, the proposed model is similar to models developed by Boore et al. (2014) and Kale et al. (2015) at short periods. At long periods the current model is similar to other models except the ones proposed by Farajpour, Pezeshk, and Zare (2019) and Zafarani et al. (2018). For third scenario, the provided model in this study is close to Boore et al. (2014) and Kale et al. (2015) models. In the last scenario, the proposed model is similar to ones developed by Zafarani et al. (2018), Kale et al. (2015) and TR-NGA models and it decreases with more slopes if it is compared to other models at long periods. It is shown that with assumption of nonlinearity site term, the proposed model is more consistent with global and regional models at large magnitude and soft soils.