Jiahua Wu, Liming Dou, Zheng Cai, Yanli Ai, Shiwu Zhang, Zhenya Zheng, Xiaohui Fan, Yuanyuan Su, Jianfeng Wu, Liming Dou
We present a Chandra/ACIS-I study of X-ray sources in BOSS~1441, a protocluster at $z=2.32\pm0.02$ that exhibits a prominent overdensity of Ly$\alpha$ emitters (LAEs).Using a 45\,ks observation, we identify seven X-ray sources spatially coincident with LAE density peaks. The average X-ray photon ind…
Zeng Kunqiang, Zeng Gan, Kunqiang Zeng
Based on the "Gravity-Pressure Model," this paper proposes a unified framework spanning philosophy and astrophysics, aiming to provide an integrative reinterpretation of the three fundamental concepts: time, space, and entropy. The model is constructed upon three mutually supporting pillars: First, …
Yellow Sea, Yellow Sea
Based on a unified non-perturbative quantum gravity framework, this paper systematically elaborates on the cross-scale universality of quantum gravity correction terms containing logarithmic components. At the microscopic scale of black holes, these terms dynamically resolve singularities through a …
Shuang Du, Renxin Xu, Shuang Du, Renxin Xu
The provenance of the pulsed radio emissions emanating from pulsars has long been a subject of enduring and intricate perplexity. A common viewpoint posits that the production of this coherent radio radiation necessitates robust electric currents.Noting that pinch instability is likely to occur conc…
Kaiwen Zheng, Kun Ma, Jiali Chen, Haosi Song, Tiancong Zhang, Shiyi Wang, Han Wang, Peng Jiang, Xiaoyan Li, Peng Jiang, Xiaoyan Li
With excellent seeing conditions, ultra-low infrared background noise, high frequency of space debris transits, and continuous polar night coverage, Dome A in Antarctica has become an ideal platform for ground-based astronomy and space situational monitoring. As a crucial observatory site for intern…
Yao Zhang, Qingshan Li, Zhengyang Li, Xiaoyan Li, Zhenshuai Yan, Jia’nan Cong, Zhengyang Li
Effective motors are crucial for driving astronomical telescopes, especially for those operating in Antarctica, where the harsh environment and operating conditions, including extreme low temperature, ice/snow accumulation, low power consumption, and unattended operation, introduce challenges to the…
Yuxin Xin, Baoli Lun, Zejun Hu, Yue Zhong, Kai Ye, Hongying Xu, Yufeng Fan, Bin Li, Dehong Huang, Yuxin Xin, Baoli Lun, Zejun Hu
We report a new standalone Robotic All-Sky narrowband Imager (RASI) for auroral and airglow studies. RASI has new optics and an electromechanical system, low operation and installation costs, easy deployment and fully automatic features. The new optics provide an all-sky field of view with excellent…
Shijie Sun, Jiaqin Xu, Minquan Zhou, Shenzhe Xu, Fengquan Wu, Haoran Zhang, Juyong Zhang, Bin Ma, Zhaohui Shang, Xuelei Chen, Xuelei Chen
The redshifted 21 cm line, arising from neutral hydrogen, offers a unique probe into the intergalactic medium and the first stars and galaxies formed in the early universe. However, detecting this signal is a challenging task because of artificial radio-frequency interference (RFI) and systematic er…
Yun Li, Xiaoyan Li, Shihai Yang, Zhenshuai Yan, Yanpeng Guo, Zhuangzhuang Deng, Cong Pan, Zhengyang Li, Bozhong Gu, Michael C. B. Ashley, Shihai Yang
Antarctic telescopes, especially those located at Dome A, face significant reliability challenges owing to the extremely harsh working environment, among which the reliability of the control system is critical in ensuring stable operation. This paper describes various factors affecting the reliabili…
Jiali Chen, Zhengyang Li, Zhixu Wu, Jia’nan Cong, Zichong Zhang, Kaiwen Zheng, Zhengyang Li, Zhixu Wu
Dome A, in Antarctica, offers an exceptional site for ground-based infrared astronomy, with its extremely low atmospheric infrared background noise and excellent seeing conditions. However, deploying near-infrared telescopes in the harsh environment of Antarctica faces the critical challenge of fros…
Jiannan Sun, Zhe Kang, Zhenwei Li, Cunbo Fan, Cunbo Fan
In response to the issue of fuzzy matching and association when optical observation data are matched with the orbital elements in a catalog database, this paper proposes a matching and association strategy based on the arcsegment difference method. First, a matching error threshold is set to match t…
Chunxu Ren, Yun Li, Yanzhao Li, Weihua Gao, Wenlong Niu, Xiaodong Peng, Yun Li
Space target imaging simulation technology is an important tool for space target detection and identification, with advantages that include high flexibility and low cost. However, existing space target imaging simulation technologies are mostly based on target magnitudes for simulations, making it d…
Min Li, Liang Wang, Zhiqiang Zou, Ali Luo, Bo Qiu, Peng Jia, Ying Shan, Liang Wang, Zhiqiang Zou
The detection of stellar flares is crucial to understanding dynamic processes at the stellar surface and their potential impact on surrounding exoplanetary systems. Extensive time series data acquired by the Transiting Exoplanet Survey Satellite (TESS) offer valuable opportunities for large-scale fl…
Zhipeng Liang, Chengzhi Liu, Yanning Zheng, Xue Dong, Chengzhi Liu
A method is presented for determining instant values of Earth’s polar motion (PM) using a set of lunar laser ranging (LLR) measurements acquired simultaneously by tri-static common view (TCV) at three LLR stations in Europe. We developed a model of the LLR TCV measurements, then formulated the linea…
Biyuan Gao, Dongguang Wang, Yingzi Sun, Yuliang Shen, Xiao Yang, Junfeng Hou, Yingzi Sun
Stray light has a significant effect on the overall performance of telescopes, particularly for infrared solar telescopes, in which internal thermal radiation causes additional stray light sources. We establish a 3-dimensional model using stray light theory and the real opto-mechanical structure of …
Haoming Dai, Li Deng, Li Deng
Radio interferometric imaging samples visibility data in the spatial frequency domain and then reconstructs the image. Because of the limited number of antennas, the sampling is usually sparse and noisy. Compressed sensing-based on convex optimization is an effective reconstruction method for sparse…
Xue Chen, Yuyang Ma, Xiaoyun Ma, Junjie Huang, Zehua Dong, Zegang Ding, Xiaoyun Ma, Zehua Dong
Earth-based deep space radar studies celestial bodies by both transmitting and receiving radio waves, whereas radio telescopes only work passively. On the operational level, radar missions use only short observation times, which leaves a large portion of the time available for astronomical observati…
Li Li, Li Li
Stellar energy is a crucial component of stellar research. Descriptions regarding stellar energy typically necessitate the extensive use of advanced mathematics. However, in this paper, the author ingeniously replaces the sections requiring advanced mathematical descriptions with simple high school …
Yellow Sea, Yellow Sea
This paper proposes a novel non-perturbative quantum gravity framework based on quantum topological structures. By introducing "quantum vortices" to characterize the topological order of statistical averages of microscopic particles and embedding the AdS/CFT holographic duality, black hole singulari…
Qi Yalin, Qi Yalin
To clarify the existence of foliation fractures (including bedding fractures) under formation conditions in tectonically stable areas of sedimentary basins, reveal the differences between fractures observed in surface cores and real subsurface fracture systems, and guide the exploration of shale-typ…
FAN Manhong, XIAO Qian, YU Qinghe, ZHAO Junhao, FAN Manhong
Spatiotemporal forecasting of surface soil moisture (SSM) is recognized as a critical scientific issue in precision agricultural irrigation, regional drought monitoring, and early warning systems for extreme precipitation. However, long-term forecasting continues to pose formidable challenges becaus…
XI Cheng, YAN Min, ZUO Hejun, LIU Ruimin, ZUO Hejun
Desert lakes are an important link in the water cycle and an important reservoir of water resources in arid and semi-arid areas, playing an important role in maintaining the stability of the regional natural environment. However, studies on the hydrochemical evolution and transformation relationship…
Noura BCHATNIA, Manel ALLANI, Hatem IBRAHIM, Ines BOUZRIBA, Mohamed Amine MAAOUI, Nadhem BRAHIM, Manel ALLANI
Oasis soils in Tunisia are characterized by low soil organic carbon (SOC) stocks, primarily due to their coarse texture and intensive irrigation practices. In the Gataaya Oasis, soils receive 3.000 to 4.000 L/m2 annually through submersion irrigation, leading to a rapid decline in SOC stocks. Despit…
ZHANG Shihang, CHEN Yusen, ZHOU Xiaobing, ZHANG Yuanming, ZHOU Xiaobing
In dryland ecosystems, nitrogen (N) is the primary limiting factor after water availability, constraining both plant productivity and organic matter decomposition while also regulating ecosystem function and service provision. However, the distributions of different soil N fraction stocks in dryland…
Abdelaziz Q BASHABSHEH, Kamel K ALZBOON, Zeyad ALSHBOUL, Abdelaziz Q BASHABSHEH
Extreme temperature events have intensified across Jordan over the past 40 a, increasing risks to agriculture, water availability, urban infrastructure, and public health. The purpose of this study is to assess the long-term spatial trends and regime shifts in extreme temperature indicators across J…
PAN Yilu, YANG Xia, FANG Yuxuan, PAN Hongyi, ZHANG Wen, PAN Hongyi
Increasing human disturbance and climate change have threatened ecological connectivity and structural stability, especially in semi-arid mountain areas with sparse vegetation and weak hydrological regulation. Large-scale ecological restoration, such as adding ecological sources or corridors, is dif…
SHI Qingqing
The Turpan-Hami (Tuha) Basin of China, a critical region on the Silk Road Economic Belt and a major national energy base, occupies a significant position in energy security and in the major industrial clusters in Xinjiang Uygur Autonomous Region, China. Understanding spatial and temporal evolution o…
Li Zhanwen, Wu Wenheng, Hangang Yao, Zhu Yuze, Li Yuxuan
Exploring the coupling and coordination relationship between new-type urbanization and agricultural modernization (the "two modernizations") in the Yellow River Basin is of great significance for implementing the strategy of ecological protection and high-quality development of the Yellow River Basi…
CHENG Lanhua, YANG Xianming, PAN Xumei, AN Jingfeng, YANG Xianming
Territorial spatial ecological restoration is a crucial prerequisite for optimizing the territorial spatial patterns, enhancing the ecosystem functions, and achieving sustainable development at the regional scale. The Qaidam Basin, located in the alpine arid region of the Qinghai–Xizang Plateau, Chi…
ZHANG Houtian, WANG Shidong, DING Junjie, WANG Shidong
Climate change significantly affects vegetation dynamics. Thus, understanding interactionsbetween vegetation and climatic factors is essential for ecological management. This study used kernelNormalized Difference Vegetation Index (kNDVI) and climatic data (temperature, precipitation, humidity,and v…
Li Li
Like other branches of physics, astronomy encompasses both experiment and theory. The tools and methods utilized in theoretical astronomy are identical to those employed in other branches of theoretical physics. However, experimental astronomy differs from other experimental disciplines in that we c…
Pengyu Li, Xiaohan Lu, Jiacheng Wang, Songzhe Lu, Kai Li, Jian Ni, Kai Li
Grain size is widely used for environmental reconstruction in various depositional settings, yet its precise interpretation remains challenging. In shallow lakes within humid region, interpretation of grain size is particularly hindered by complex variations in climate and environments. Here, we con…
Biping Gong
Five decades after the discovery of radio pulsars, main stream theories based on polar cap still suffer from difficulties in both self-consistency and confrontation with observations[1]. Increasing observation of individual subpulses of pulsars, i.e., high brightness temperature, highly polarized, a…
Xu Xiao, Lou Zheng, Ping Yiding, Dong Yunfen, Zheng Xianzhong
In optical systems with small focal ratios, the optical performance of narrowband filters is significantly affected by the telescope's optical system and the angle of incidence of light. From the center of the field of view to the edge, the deviation of the incident angle gradually increases, causin…
Du Hongqiang, Gong Jianjun, Wu Dan, Qu Lili, Wu Wenjun, Dong Shaowu, Zhang Shougang
Cesium atomic clocks are the key core equipment in modern atomic timekeeping. In recent years, the domestically produced optically pumped cesium atomic clock TA1000 has been widely applied in timekeeping operations. The clock difference prediction algorithm for atomic clocks is one of the factors af…
Xiao Yanshan, Zhang Haixia, Huang Yao, Jiang Zhibo, Chen Zhiwei, Zheng Sheng, Zhang Peng, Luo Xiaoyu, Jiang Yu, Pan Xuejiao
Dense molecular cloud clumps are sites of star formation, and their morphological characteristics are closely related to the physical properties of molecular gas. This work is based on data from the 13.7 m millimeter-wave radio telescope of Purple Mountain Observatory, covering galactic longitude (g…
Liu Xintao, Zhang Haojing
We collected multi-band radiation flux densities for a blazar sample from the Fermi Large Area Telescope Fourth Source Catalog Data Release 3 (4FGL-DR3), with the collected data covering radio at 1.4 and 143 GHz, near-infrared (J, H, and K), optical (u, g, r, i, and z), ultraviolet (far ultraviolet …
Xiao Fan, Wang Xiaolong, Wang Fan, Fang Min, Zhang Miaomiao
Identifying young stars in star-forming regions is crucial for a comprehensive understanding of the star formation process. This study uses Gaia (Global Astrometric Interferometer for Astrophysics) astrometric data to identify and analyze young stars in the IC 5146 star-forming region. First, Gaia a…
Wan Yujie, Jiang Zhibo, Jiang Yu, Chen Zhiwei
Stars form from the gravitational collapse of dense molecular cloud cores. Investigating the specific locations within molecular cloud clumps where this collapse motion preferentially occurs will help elucidate star formation across different regions of molecular cloud clumps, providing additional i…
Hu Zhipeng, Mao Lisheng
Utilizing archival data from the Wide-field Infrared Survey Explorer (WISE), we compared the long-term mid-infrared variability amplitudes of Broad-line Seyfert 1 (BLSy1) galaxies and Narrow-line Seyfert 1 (NLSy1) galaxies. Furthermore, we analyzed the correlations between long-term mid-infrared var…
Hailong Zhang, Dengrong Lu, Jixian Sun, Jibin Li, Xuguo Zhang
In the site selection process for millimeter-wave and submillimeter-wave radio astronomical telescopes, in order to fully understand the cloud cover information of candidate astronomical sites, it is essential to design an all-sky camera system applicable to field environments. Therefore, according …
Li Gen, Li Ying, Li Qiao, Li Hui
The Lyman-alpha Solar Telescope (Ly$\alpha$ Solar Telescope, LST) is one of the payloads on the Advanced Space-based Solar Observatory (ASO-S, Chinese name "Kuafu-1") satellite, which includes three scientific instruments: the White-light Solar Telescope (WST), the Solar Disk Imager (SDI), and the S…
Zhang Wenyang, Wu Yang, Liu Shengwen
Taking a 40 m offset Cassegrain antenna as an example, this study analyzes different small panel fitting schemes to investigate the relationship between small panel design and surface accuracy, verifying that the reflector surface accuracy is proportional to the square of the circumferential and axi…
Pang Yuchen, 彭子夫, Geng Tao, Sun Weimin, Yan Yunxiang
Fiber optic mode scrambling technology for high-resolution spectroscopic observations can effectively improve radial velocity measurement precision, providing a powerful tool for research on cutting-edge scientific problems such as the search for Earth-like planets. Currently, the impact of mode noi…
Xu Xueqing, Guo Li, Zhou Weili, Zhang Zhibin, Song Shuli, Wang Guangli, Qi Chaoxiang
Earth rotation can be described using Earth Orientation Parameters (EOP). As key parameters connecting the celestial and terrestrial reference frames, EOP constitute important spatiotemporal datum parameters. Due to latency in observational data processing, real-time applications of EOP must be real…
Zhaowei Zhang, Han Wenbiao
Future space-based gravitational wave detectors (such as LISA and Taiji) will detect gravitational wave events from supermassive binary black hole mergers. Highly precessing supermassive binary black holes, in addition to emitting traditional inspiral-merger-ringdown gravitational wave signals, can …
Li Sida, Guo Fulai
The Sgr A lobes in the Galactic Center are a pair of bubble-like structures perpendicular to the galactic disk and symmetric about the Galactic Center, with a height of approximately 15 pc. X-ray observations indicate that these bubbles possess well-defined boundaries, and were likely formed by shoc…
Long Yin, Chen Menghua
Metal-poor stars are stars that formed in the early universe, preserving chemical signatures from early nucleosynthesis and providing crucial clues for investigating heavy-element nucleosynthesis mechanisms and the chemical evolution of the early cosmos. Based on Th/U nucleocosmochronology, we have …
Liu Di, Zhang Peng, Tian Haijun, Liu Gaochao, Yang Xiangming, Xiong Zhuang
Wide binary stars are systems composed of two widely separated celestial bodies orbiting a common center of mass, with their physical projected separation being the most direct observable quantity. Using high-purity wide binary stars within 1 kpc of the solar neighborhood as a test sample, anomalous…
Jinyang Lin, Zhu Zhenghao, Ma Renyi
Low-frequency radio point sources are of significant importance in astronomical research, serving not only as crucial probes for studying galaxy evolution history but also as the primary foreground contaminants for detecting Epoch of Reionization signals. Low-frequency observations are essential for…
