Zobrazeno 1 - 10
of 4 549
pro vyhledávání: '"J L, Chen"'
Autor:
J. L. Chen, J. S. Zhang, C. Henkel, Y. T. Yan, H. Z. Yu, Y. X. Wang, Y. P. Zou, J. Y. Zhao, X. Y. Wang
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 164 (2024)
The nitrogen isotope ratio ^14 N/ ^15 N is a powerful tool to trace Galactic stellar nucleosynthesis and constrain Galactic chemical evolution. Previous observations have found lower ^14 N/ ^15 N ratios in the Galactic center and higher values in the
Externí odkaz:
https://doaj.org/article/3d2c6bbc88cf4a0497385c93ad347c22
Autor:
Z. Wang, Z. G. Wen, J. P. Yuan, N. Wang, J. L. Chen, H. G. Wang, W. Han, H. Wang, X. F. Duan, C. B. Lyu, J. P. Wang, Z. W. Wu
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 109 (2024)
Radio observations of pulsars offer a potential method to probe the intricate microstructure in the turbulent interstellar medium. Here we report on a high-resolution dynamic spectral analysis of the “swooshing pulsar” B0919+06 observed with the
Externí odkaz:
https://doaj.org/article/262c28e9cfbe4ad28d1950fc487f3e05
Autor:
J. L. Chen, Z. G. Wen, Z. Wang, X. F. Duan, D. L. He, N. Wang, H. G. Wang, J. P. Yuan, L. Huang, C. B. Lyu, R. Yuen, W. M. Yan, Z. W. Wu, W. Han, B. B. Xiang, A. J. Dong
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 1, p 114 (2024)
We have carried out a detailed study of individual pulse emission from the pulsar J2022+5154 (B2021+51), observed at 2250 MHz using the Jiamusi 66 m radio telescope. We have investigated the modulations in single-pulse behavior using fluctuation spec
Externí odkaz:
https://doaj.org/article/36ca0eada0284ba19cfc80d58c74aa91
Publikováno v:
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3-W10, Pp 111-115 (2020)
As one of the most popular surveillance technologies in the 21st century, Lidar is applied in commercial, military and civilian applications. paper mainly introduces the development process of Chinese and American marine lidar detection technology, c
Externí odkaz:
https://doaj.org/article/1d723917defc493b838d612a0b7cd3e7
Publikováno v:
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3-W10, Pp 815-819 (2020)
There are many intertidal zones and island reefs in the coastal area, the traditional shipborne acoustic measurement method is extremely inefficient, so the coastal area three-dimensional integrated measurement has always been a difficult point in th
Externí odkaz:
https://doaj.org/article/a3979eee8dba42cc9d03b8f00172215c
Publikováno v:
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XLII-3-W10, Pp 215-220 (2020)
The wavelet threshold method is widely used in signal denoising. However, traditional hard threshold method or soft threshold method is deficient for depending on fixed threshold and instability. In order to achieve efficient denoising of echo signal
Externí odkaz:
https://doaj.org/article/9fee8695166048709ad29909973607a6
Autor:
Y. P. Zou, J. S. Zhang, C. Henkel, D. Romano, W. Liu, Y. H. Zheng, Y. T. Yan, J. L. Chen, Y. X. Wang, J. Y. Zhao
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 268, Iss 2, p 56 (2023)
To investigate the relative amount of ejecta from high-mass versus intermediate-mass stars and to trace the chemical evolution of the Galaxy, we have performed a systematic study of Galactic interstellar ^18 O/ ^17 O ratios toward a sample of 421 mol
Externí odkaz:
https://doaj.org/article/835c1c3eb7bf46eab021e1582a57c245
Autor:
H. Wang, Z. G. Wen, X. F. Duan, Z. Wang, D. L. He, H. G. Wang, N. Wang, J. P. Yuan, W. M. Yan, R. Yuen, W. Han, Q. J. Zhi, B. B. Xiang, S. J. Dang, J. L. Chen, C. B. Lyu, J. P. Wang, T. Ergesh
Publikováno v:
The Astrophysical Journal, Vol 950, Iss 2, p 166 (2023)
We have carried out a detailed study of polarimetric individual pulse emission from the pulsar J1701−3726 (B1658−37), observed at 1369 MHz using the Parkes 64 m radio telescope. The single-pulse sequences reveal the presence of the three major em
Externí odkaz:
https://doaj.org/article/302998e015d14fd687a7de4b25437316
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 266, Iss 2, p 29 (2023)
We carried out a spectral line survey of CH _3 OH toward a large sample of 175 high-mass star-forming regions in the 3 mm, 2 mm, and 1.3 mm bands with the Institut de Radioastronomie Millimétrique (IRAM) 30 m telescope. Out of our 175 targets, 148 s
Externí odkaz:
https://doaj.org/article/ad26eaacff0f4dfdae4bd4ef96add2f7
Autor:
J. L. Chen, Z. G. Wen, X. F. Duan, D. L. He, N. Wang, C. B. Lyu, H. G. Wang, D. Li, J. P. Yuan, W. Han, Z. Wang, R. Yuen, W. M. Yan, B. B. Xiang, S. J. Dang, H. Wang, J. R. Niu, J. P. Wang, T. Ergesh, S. R. Cui, Y. J. Zhang
Publikováno v:
The Astrophysical Journal, Vol 946, Iss 1, p 2 (2023)
Using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we have recorded over 1.2 × 10 ^4 single pulses from PSR B0823+26 (J0826+2637) at 1.25 GHz with 500 MHz bandwidth. These high-sensitivity observations detected with FAST are unp
Externí odkaz:
https://doaj.org/article/835add2e142b4ab8bc5455a3c717a83a