Science China Physics, Mechanics & Astronomy最新文献_第5页

Experimental study of the circular subsonic pipe jet expanding into near vacuum environment 圆形亚音速管道射流在近真空环境中膨胀的实验研究

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-18 DOI: 10.1007/s11433-024-2546-4

Xin Chen, Fangyuan Liu, Yu-Ze Wang, Si-Yu Zhang, Qingxiang Li, Jian-Zhao Wu, Bo-Fu Wang, Kai Leong Chong, Cheng Wang, Jian-Hua Zhang, Quan Zhou

{"title":"Experimental study of the circular subsonic pipe jet expanding into near vacuum environment","authors":"Xin Chen, Fangyuan Liu, Yu-Ze Wang, Si-Yu Zhang, Qingxiang Li, Jian-Zhao Wu, Bo-Fu Wang, Kai Leong Chong, Cheng Wang, Jian-Hua Zhang, Quan Zhou","doi":"10.1007/s11433-024-2546-4","DOIUrl":"10.1007/s11433-024-2546-4","url":null,"abstract":"<div><p>In extreme ultraviolet (EUV) lithography, mitigation of tin (Sn) debris contamination during EUV light generation is an important issue. In practice, the high-speed jet flows are used to transport debris away from the collector mirror, thereby protecting it and improving system performance. Since EUV light is generated in a near-vacuum environment, understanding jet flow behavior in these extreme conditions is crucial for effective contamination control. In this study, we introduce a new facility designed to investigate jet extruded into near-vacuum environments using particle image velocimetry (PIV) and particle tracking velocimetry (PTV). Our results reveal a significantly extended potential core and a “top-hat” velocity profile with an inlet flow rate of 0.28 standard liter per minute (SLPM) and ambient pressure of 13.9 Pa. We also investigate the effects of inlet flow rate, ambient pressure, and jet diameter on the centerline streamwise velocity of the jet flow. These findings aim to guide the design of equipment operating in vacuum conditions.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 9","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combine deep learning and Bayesian analysis to separate overlapping gravitational wave signals 结合深度学习和贝叶斯分析分离重叠的引力波信号

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-14 DOI: 10.1007/s11433-024-2594-5

Cunliang Ma, Weiguang Zhou, Zhoujian Cao, Mingzhen Jia

{"title":"Combine deep learning and Bayesian analysis to separate overlapping gravitational wave signals","authors":"Cunliang Ma, Weiguang Zhou, Zhoujian Cao, Mingzhen Jia","doi":"10.1007/s11433-024-2594-5","DOIUrl":"10.1007/s11433-024-2594-5","url":null,"abstract":"<div><p>Future gravitational wave (GW) observatories, such as the Einstein Telescope, are anticipated to encounter overlapping GW signals, presenting considerable obstacles to GW data processing techniques, including signal identification and parameter estimation. In this letter, we propose a scheme of combining deep learning and Bayesian analysis to disentangle overlapping GW signals. The deep learning part takes a data-driven approach that employs an encoder-separation-decoder framework which is powerful enough to extract the shape of the signal even when the GW signals completely align. The Bayesian analysis part takes the matched filtering technique to extract the amplitude of the GW signals. Our scheme can facilitate the utilization of existing GW detection and parameter estimation methods for future instances of overlapping strain. This methodology effectively reduces biases in parameter estimation when handling multiple intertwined signals. Remarkably, this marks the first known instance where deep learning has been successfully utilized to disentangle overlapping GW signals.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-precision measurement of microwave electric field by cavity-enhanced critical behavior in a many-body Rydberg atomic system 多体里德伯原子系统中腔增强临界行为的微波电场高精度测量

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-14 DOI: 10.1007/s11433-024-2622-x

Qinxia Wang, Yukang Liang, Zhihui Wang, Shijun Guan, Pengfei Yang, Pengfei Zhang, Gang Li, Tiancai Zhang

引用次数: 0

Can we distinguish between adiabatic and isocurvature fluctuations with pulsar timing arrays? 我们可以区分绝热和等曲率波动与脉冲星定时阵列？

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-13 DOI: 10.1007/s11433-025-2614-0

Zu-Cheng Chen, Lang Liu

{"title":"Can we distinguish between adiabatic and isocurvature fluctuations with pulsar timing arrays?","authors":"Zu-Cheng Chen, Lang Liu","doi":"10.1007/s11433-025-2614-0","DOIUrl":"10.1007/s11433-025-2614-0","url":null,"abstract":"<div><p>Understanding the nature of primordial fluctuations is pivotal to unraveling the Universe’s early evolution. While these fluctuations are observed to be nearly scale-invariant, quasi-adiabatic, and Gaussian on large scales, their small-scale behavior remains poorly constrained, offering a potential window into new physics. Recent detections of a stochastic gravitational wave background in the nanohertz frequency range by pulsar timing arrays (PTAs), including NANOGrav, PPTA, EPTA+InPTA, and CPTA, align with astrophysical predictions from supermassive black hole binaries but could also encode signatures of primordial phenomena. We investigate whether the observed signal originates from primordial isocurvature or adiabatic fluctuations by fitting them to the latest NANOGrav dataset. Through comprehensive Bayesian model comparison, we evaluate the distinguishability of these scenarios given current PTA sensitivities. Our results demonstrate that existing data cannot conclusively differentiate between isocurvature and adiabatic sources, highlighting the need for enhanced observational capabilities to probe the primordial universe at small scales.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Is PSR J0514–4002E in a PBH-NS binary? PSR J0514-4002E在PBH-NS二进制中吗？

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-13 DOI: 10.1007/s11433-025-2615-3

Zu-Cheng Chen, Lang Liu

引用次数: 0

First results of terrestrial gamma-ray flash observed by Insight-HXMT Insight-HXMT观测到的地面伽玛射线闪光的第一批结果

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-11 DOI: 10.1007/s11433-024-2599-4

Qibin Yi, Yi Zhao, Shaolin Xiong, Xuejuan Yang, Ce Cai, Shuo Xiao, Gang Li, Gaopeng Lu, Hongbo Zhang, Fanchao Lyu, Wei Xu, Xiaobo Li, Chengkui Li, Mingyu Ge, Haisheng Zhao, Wangchen Xue, Jiacong Liu, Chao Zheng, Yanqiu Zhang, Chenwei Wang, Wenjun Tan, Shenglun Xie, Yue Huang, Zhi Chang, Congzhan Liu, Fangjun Lu, Liming Song, Yupeng Xu, Zhen Zhang, Shuangnan Zhang, Tipei Li

{"title":"First results of terrestrial gamma-ray flash observed by Insight-HXMT","authors":"Qibin Yi, Yi Zhao, Shaolin Xiong, Xuejuan Yang, Ce Cai, Shuo Xiao, Gang Li, Gaopeng Lu, Hongbo Zhang, Fanchao Lyu, Wei Xu, Xiaobo Li, Chengkui Li, Mingyu Ge, Haisheng Zhao, Wangchen Xue, Jiacong Liu, Chao Zheng, Yanqiu Zhang, Chenwei Wang, Wenjun Tan, Shenglun Xie, Yue Huang, Zhi Chang, Congzhan Liu, Fangjun Lu, Liming Song, Yupeng Xu, Zhen Zhang, Shuangnan Zhang, Tipei Li","doi":"10.1007/s11433-024-2599-4","DOIUrl":"10.1007/s11433-024-2599-4","url":null,"abstract":"<div><p>As China’s first X-ray astronomy satellite, the hard X-ray modulation telescope (Insight-HXMT) carries three sets of X-ray telescopes. The high energy X-ray telescope (<i>Insight</i>-HXMT/HE) could serve as an all-sky gamma-ray monitor with a detection area of up to 5000 cm<sup>2</sup> and energy range from about 200 keV to 3 MeV. These characteristics, together with the high orbital inclination angle (43°) of the satellite, make the HE very suitable for detecting terrestrial gamma-ray flashes (TGFs). In this work, we implemented a dedicated TGF search algorithm for Insight-HXMT/HE, and identified 282 bright TGFs in its first four years of operation. We made a systematic study on the properties of these TGFs, including trigger time, duration, intensity, as well as the lightning association. We found that TGFs detected in mid-latitude regions (30° to 43°) are rare and they do not exhibit significantly different properties compared with TGFs in low-latitude (within 30°). Interestingly, the hardness ratio of TGF measured by <i>Insight</i>-HXMT/HE seems to be independent of the TGF duration, which differs from previous studies. These results show that, despite the dedicated design for astronomical observation, <i>Insight</i>-HXMT/HE is a versatile instrument to study energetic radiation phenomena from the Earth.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143612171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental realization of Wheeler’s delayed-choice experiment with dual selections 双重选择条件下Wheeler延迟选择实验的实验实现

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-10 DOI: 10.1007/s11433-024-2587-y

Xiaowan Yang, Xinglei Yu, Liangsheng Li, Xinzhi Zhao, Tianle Zheng, Chengjie Zhang, Chuan-Feng Li, Guang-Can Guo

引用次数: 0

Observation of tunable exceptional points in a non-Hermitian acoustic system 非厄米声学系统中可调谐异常点的观测

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-10 DOI: 10.1007/s11433-024-2608-4

Chen Liu, Zhongming Gu, Haixiao Zhang, Xiaowei Zhang, Chuanhao Ge, Tuo Liu, Jie Zhu

{"title":"Observation of tunable exceptional points in a non-Hermitian acoustic system","authors":"Chen Liu, Zhongming Gu, Haixiao Zhang, Xiaowei Zhang, Chuanhao Ge, Tuo Liu, Jie Zhu","doi":"10.1007/s11433-024-2608-4","DOIUrl":"10.1007/s11433-024-2608-4","url":null,"abstract":"<div><p>Exceptional points (EPs) have extensive and important applications in many wave-based technologies, such as ultra-sensitive sensing, unidirectional scattering and low-threshold laser. However, most of the previous EP-related wave phenomena are demonstrated in systems with fixed configuration, thereby extremely constraining their adaptability and reconfigurability in practice. Here, we introduce a flexible approach to tuning EPs in an acoustic system with sandwich structures. A rotatable component, associated with an alterable gradient index, is clamped by a pair of lossy acoustic resonators. Theoretical derivations and numerical simulations validate the capabilities of the model in continuously regulating EPs in the parameter space, with ingenious experimental setups confirming these findings. The results showcase the system’s effectiveness in achieving unidirectional reflectionless wave propagation across various frequencies. Our research reveals a flexible approach to linking the adjustment of EPs to a simple structural parameter, offering a robust framework for exploring and implementing non-Hermitian wave phenomena in practical scenarios.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":"68 5","pages":""},"PeriodicalIF":6.4,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extraction of energy from a black hole in Einstein-Maxwell-scalar theory 从黑洞中提取能量的爱因斯坦-麦克斯韦标量理论

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-10 DOI: 10.1007/s11433-024-2607-1

Cheng-Yong Zhang, Zehong Zhang, Ruifeng Zheng

引用次数: 0

Revealing the signal of QCD phase transition in heavy-ion collisions 揭示重离子碰撞中QCD相变信号

IF 6.4 1区物理与天体物理

Science China Physics, Mechanics & Astronomy Pub Date : 2025-03-06 DOI: 10.1007/s11433-024-2619-7

Yi Lu, Fei Gao, Xiaofeng Luo, Lei Chang, Yuxin Liu

引用次数: 0