Results 181 to 190 of about 351 (218)
Global Policy, EarlyView.ABSTRACT The European Union's proposed Space Law aims to establish a unified approach for sustainable space activities across the EU. While the EU's satellite constellations contribute to sustainability efforts, they can also have negative environmental impacts.
Elena Cirkovic, Vitali Braun
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China's Strategic Approach to Tech Diplomacy in a Time of Global Uncertainty
Global Policy, EarlyView.ABSTRACT In the wake of U.S.‐China technological competition and the COVID‐19 pandemic, “tech diplomacy” has gained prominence in Chinese political and academic discourse. This concept is often ideologically framed to critique Western hegemonic narratives perceived as hindering China's technological advancement.
Zhao Alexandre Huang, Xiang Meng
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Nondestructive Inspection of Water Pipes: A Review. [PDF]
Sensors (Basel)Nowroski R, Rizzo P, Byrne L, Ziegler A.
europepmc +1 more source
Arabian Archaeology and Epigraphy, EarlyView.ABSTRACT In 2019, the Dadan Archaeological Project (CNRS/RCU/AFALULA) identified a Late Antique village 1 km south of ancient Dadan in the al‐ʿUlā valley (northwest Saudi Arabia). Three excavation seasons at this site (2021–2023) have uncovered a massive building constructed in the late third or early fourth cent.
Jérôme Rohmer +11 more
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Asia‐Pacific Economic History Review, Volume 65, Issue 1, Page 131-159, March 2025.Abstract This study examines the adaptive market hypothesis in the prewar and wartime Japanese stock market using a new market capitalization‐weighted price index. First, we find that the degree of market efficiency varies over time and with major historical events. This implies that the hypothesis is supported in this market.
Kenichi Hirayama, Akihiko Noda
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Sound and vibration of railroad wheel
Proceedings of the 1996 ASME/IEEE Joint Railroad Conference, 2002Vibrations generated at the contact surfaces between rails and wheels have been considered to be the main cause of noise from railroad vehicles. These noises are classified into three types: rolling, impact, and screech noise. The generation mechanism of each noise has not yet been clarified.
H. Sakamoto, K. Hirakawa, Y. Toya
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Ring model of railroad wheel vibrations
The Journal of the Acoustical Society of America, 1983This paper presents a model for prediction of the vibration characteristics of railroad wheels. Earlier workers showed that the ring theory gave a good explanation of the ratio of resonant frequencies in the railroad wheel, assuming flexural modes are excited in the rim.
Shivan Haran, R. D. Finch
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Response of Railroad Ballast to Vertical Vibration
Transportation Engineering Journal of ASCE, 1978The effect of vertical vibration on some railroad ballasts in laboratory tests is presented. The ballasts were found to behave in a similar manner to that previously reported for sands, i.e., peak acceleration was the main parameter affecting densification. For unsurcharged ballast, little increase in density occurred at peak accelerations below 1 g, a
Paul N. Gaskin +2 more
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Noise and Vibration from Railroad Traffic
2012The overdue beginning of new construction and development of train tracks since the 1960s coincided in the 1970s with an increasing sensitivity of the population towards noise, especially road traffic noise. This sensitivity has constantly increased since then and has significantly influenced the legislation concerning traffic noise.
Rüdiger G. Wettschureck +3 more
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