Results 1 to 10 of about 1,798,975 (310)

A novel chronostratigraphic framework for the Aptian–Albian paleoclimate events [PDF]

Scientific Reports
The Aptian–Albian interval was marked by paleoclimatic changes encompassing volcanic events and monsoonal activity of which the precise timing were not well-defined.
João M. F. Ramos, Jairo F. Savian, Daniel R. Franco, Milene F. Figueiredo, Carolina G. Leandro, Rodolfo Coccioni, Fabrizio Frontalini, Nicola Casadei, Hironao Matsumoto, Leonardo R. Tedeschi, Luigi Jovane, Ricardo I. F. Trindade   +11 more
doaj   +2 more sources

Astronomical calibration of the middle Cambrian in Baltica: global carbon cycle synchronization and climate dynamics

Nature Communications
The Alum Shale Formation of Baltica preserves one of the most continuous and fossil-rich records for the Cambrian Period. Thus, the Alum Shale is a key sedimentary archive for refining global chronostratigraphy, reconstructing carbon cycle perturbations,
Valentin JAMART, Damien PAS, Linda A. HINNOV, Jorge E. SPANGENBERG, Thierry ADATTE, Arne T. NIELSEN, Niels H. SCHOVSBO, Nicolas THIBAULT, Michiel ARTS, Allison C. DALEY   +9 more
doaj   +2 more sources

StarWhisper Telescope: an AI framework for automating end-to-end astronomical observations [PDF]

Communications Engineering
The exponential growth of large-scale telescope arrays has boosted time-domain astronomy development but introduced operational bottlenecks, including labor-intensive observation planning, data processing, and real-time decision-making.
Cunshi Wang, Yu Zhang, Yuyang Li, Xinjie Hu, Yiming Mao, Xunhao Chen, Pengliang Du, Rui Wang, Ying Wu, Hang Yang, Yansong Li, Beichuan Wang, Haiyang Mu, Xiaohan Chen, Shunxuan He, Hao Mo, Liyue Zhang, Lin Du, Yunning Zhao, Jianfeng Tian, Liang Ge, Yongna Mao, Shengming Li, Zheng Wang, Xiaomeng Lu, Jinhang Zou, Yang Huang, Ningchen Sun, Jie Zheng, Min He, Yu Bai, Junjie Jin, Hong Wu, Jifeng Liu   +33 more
doaj   +2 more sources

Astronomical forcing in Lopingian coal-bearing cycles: a case study of Bijie area in northwestern Guizhou

矿业科学学报, 2022
To systematically study the sedimentary cycles and their astronomical forcing in the Lopingian coal-bearing series in Bijie area, northwestern Guizhou, the GR logging data from four boreholes in this area were analyzed and tested by using time series ...
Gao Xiangyu, Shao Longyi, Wang Xuetian, Hua Fanghui, Lu Jing   +4 more
doaj   +1 more source

Cyclostratigraphy of Lower Permian alkaline lacustrine deposits in the Mahu Sag, Junggar basin and its stratigraphic implication

Frontiers in Earth Science, 2023
The Lower Permian Fengcheng Formation of the Mahu Sag is one of the most potentially petroliferous sequences in China, and its unique alkaline lacustrine deposits provide important information on the paleoclimate and paleoenvironment of the early Permian.
Yong Tang, Wenjun He, Ran Wang, Haijiao Ren, Zhijun Jin, Zhuang Yang, Zhuang Yang, Yuanyuan Zhang, Yuanyuan Zhang   +8 more
doaj   +1 more source

Milankovitch cycles and the astronomical time scale of the Zhujiang Formation in the Baiyun Sag, Pearl River Mouth Basin, China

Open Geosciences, 2022
The Zhujiang Formation in the Baiyun Sag, Pearl River Mouth Basin, China, is formed primarily in a deep-water continental slope environment. Its chronostratigraphic framework is based on biostratigraphy and sequence stratigraphy, and its geological ...
He Ping, Zhang Shangfeng, Xu Enze, Zhu Chunxia   +3 more
doaj   +1 more source

Scale Marking Method on the Circumference of Circle Elements for Astronomical Instruments in the Early Joseon Dynasty [PDF]

Journal of Astronomy and Space Sciences, 2015
During the reign of King Sejong (世宗, 1418-1450) in the Joseon Dynasty, there were lots of astronomical instruments, including miniaturized ones. Those instruments utilized the technical know-how acquired through building contemporary astronomical ...
Byeong-Hee Mihn, Ki-Won Lee, Young Sook Ahn, Yong Sam Lee   +3 more
doaj   +1 more source

Middle Miocene-Pleistocene Magneto-Cyclostratigraphy from IODP Site U1501 in the Northern South China Sea

Frontiers in Earth Science, 2022
Site U1501 of International Ocean Discovery Program (IODP) Expedition 368 locates on a broad regional basement high in the northern margin of the South China Sea (SCS).
Meinan Shi, Meinan Shi, Meinan Shi, Huaichun Wu, Huaichun Wu, Huaichun Wu, Eric C. Ferré, Sara Satolli, Qiang Fang, Qiang Fang, Qiang Fang, Yunfeng Nie, Yunfeng Nie, Yunfeng Nie, Yuhe Qin, Yuhe Qin, Yuhe Qin, Shihong Zhang, Tianshui Yang, Haiyan Li   +19 more
doaj   +1 more source

Astronomical Instruments with Two Scales Drawn on Their Common Circumference of Rings in the Joseon Dynasty [PDF]

Journal of Astronomy and Space Sciences, 2017
This study examines the scale unique instruments used for astronomical observation during the Joseon dynasty. The Small Simplified Armillary Sphere (小簡儀, So-ganui) and the Sun-and-Stars Time-Determining Instrument (日星定時儀, Ilseong-jeongsi-ui) are ...
Byeong-Hee Mihn, Goeun Choi, Yong Sam Lee   +2 more
doaj   +1 more source

Synchronizing rock clocks in the late Cambrian

Nature Communications, 2022
The Cambrian is the most poorly dated period of the past 541 million years. Here, the authors present a new astronomical time scale, allowing for a first assessment, in numerical time, of the evolution of major biotic and abiotic changes that ...
Zhengfu Zhao, Nicolas R. Thibault, Tais W. Dahl, Niels H. Schovsbo, Aske L. Sørensen, Christian M. Ø. Rasmussen, Arne T. Nielsen   +6 more
doaj   +1 more source