The Northrop YB-49 was an American prototype jet-powered heavy bomber developed by Northrop Corporation shortly after World War II for service with the United States Air Force. [1] . The YB-49 featured a flying wing design and was a turbojet -powered development of the earlier, piston-engined Northrop XB-35 and YB-35.

2020年12月20日 · The YRB is characterized by arid and semi-arid continental monsoon climate in the northwest and a semi-humid environment in the southeast (Liu et al., 2012). Increasing from the northwest to the southeast, the mean annual precipitation ranges from 123 mm to 1021 mm.

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The Northrop YB-49 was an American prototype jet-powered heavy bomber developed by Northrop Corporation shortly after World War II for service with the United States Air Force. The YB-49 featured a flying wing design and was a turbojet-powered development of the earlier, piston-engined Northrop XB-35 and YB-35.

A last chance for the flying wing design was the YRB-49, a six-engined reconnaissance bomber, with two engines in underwing nacelles to increase the volume available for fuel. But the RB-49 offered no real advantages over the B-47 and the new B-52, and production was canceled before the single YRB-49 flew on May 4, 1950.

2025年1月1日 · Taking the YRB as an example, we analyzed spatiotemporal variations in precipitation, identified abrupt changes, and calculated the 12-month standardized precipitation index (SPI 12) to investigate drought evolution in the YRB. We identified four key drought attributes (number, duration, peak, and severity) utilizing the run theory.

2024年11月25日 · The YRB (32–41° N, 95–119° E) is the second-largest drainage basin in China (Fig. 1), with an approximate area of 795 000 km 2 (including a 42 000 km 2 inland flow area). The YRB spans the Tibetan Plateau, the Inner Mongolian Plateau, the Loess Plateau, and the North China Plain.

2022年9月15日 · From the east to the west, the YRB spans four vegetation belts: deciduous broad-leaved forest belts, grassland belts, desert belts, and Qinghai–Tibet Plateau vegetation belts. The development of the GGP has led to various ecological construction projects, such as the Three-North Shelterbelt, the Yellow River Middle Reaches Shelter Forest, and ...

2022年10月12日 · Land surface temperature (LST) is a key parameter in the study of surface energy balance and climate change from local through to global scales. Vegetation has inevitably influenced the LST by changing the surface properties.

2024年12月1日 · Overall, urbanisation rate, education level, NDVI, and industrial structure upgrading had positive effects on UER. All four influencing factors promoted UER in the YRB, with the positive contribution of the urbanisation rate being the strongest and that of industrial structure upgrading being the weakest.