Robust Cyclic MUSIC Algorithm for Finding Directions in Impulsive Noise Environment by Sen Li, Xiaojing Chen, Rongxi He

“…This paper addresses the issue of direction finding of a cyclostationary signal under impulsive noise environments modeled by α-stable distribution. Since α-stable distribution does not have finite second-order statistics, the conventional cyclic correlation-based signal-selective direction finding algorithms do not work effectively. …”
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Geological characteristics and main enrichment controlling factors of coalbed methane in Nanchuan area, southeastern Sichuan Basin by Xipeng HE, Kaiming WANG, Wei LUO, Yuqiao GAO, Nana LIU, Tao GUO, Yatong ZHOU, Didi WU

“…The results show that: (1) The main coal seams of the Longtan Formation exhibit stable distribution (thickness of 2.8 to 5.7 m), good coal body structure (mainly primary structural coal), high vitrinite content (average content of 79.7%), high degree of thermal evolution (average Ro of 1.9%), and low ash yield rate (average of 14.3 %). …”
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Conditions for shale gas accumulation and the gas-bearing factors of the Wufeng-Longmaxi formation in the Laifeng–Xianfeng area by Shengling Jiang, Qinghua Zhou, Yanju Li, Rili Yang, Ruirui Zhao, Deqi Ma

“…The results reveal the following: ① The Wufeng–Longmaxi Formation shale, which was deposited in a deep-water shelf environment, has a large thickness (50–60 m) and a stable distribution. The lower segment of the Wufeng–Longmaxi Formation shale is rich in graptolite fossils, and the thickness of the WF2–LM4 graptolite zone, which is the most favorable segment for shale gas development, is approximately 12 m (LD1), which is relatively thinner than the 25 m of well JY1. ② Wufeng-Longmaxi formation shale has characteristics of a high organic carbon content. …”
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