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Science prospects for space-borne gravitational-wave missions

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National Science Review 2017年第5期4卷 683-684页

作者： yi-ming hu Jianwei Mei Jun Luo TianQin Research Center for Gravitational Physics and School of Physics and Astronomy Sun Yat-sen University

The detection of the gravitational-wave（GW）signals GW150914,GW151226together with the transient candidate LVT151012 by Advanced LIGO（a LIGO）marked a new era of GW astronomy[1].While ground-based GW

关键词： Science prospects for space-borne gravitational-wave missions GW

Near real-time gravitational wave data analysis of the massive black hole binary with TianQin

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 175-186页

作者： Hong-Yu Chen Xiang-Yu Lyu En-Kun Li yi-ming hu MOE Key Laboratory of TianQin Mission TianQin Research Center for Gravitational Physics&School of Physics and AstronomyFrontiers Science Center for TianQinGravitational Wave Research Center of CNSASun Yat-sen University(Zhuhai Campus)Zhuhai 519082China

Space-borne gravitational wave(GW)detectors can detect the merger of massive black *** early warning and localization of GW events before merging can be used to inform electromagnetic telescopes and conduct multimessenger ***,this requires real-time data transmission and analysis *** geocentric orbit of the space-borne GW detector Tian Qin makes it possible to conduct real-time data *** this study,we develop a search and localization pipeline for massive black hole binaries(MBHBs)with Tian Qin under both regular and real-time data transmission *** demonstrate that,with real-time data transmission,MBHBs can be accurately localized on the *** the approaching merger,each analysis can be finished in only 40 *** an MBHB system at a distance of 1 Gpc,if we receive data every hour,then we can pinpoint its location to within less than 1 deg^(2)on the final day before the merger.

关键词： gravitational wave detectors and experiments black holes data analysis algorithms and implementation data management

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Assessment of first-order-moment-based sample reconstruction method for design flood estimation in changing environment

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Water Science and Engineering 2023年第3期16卷 226-233页

作者： yi-ming hu Zhong-min Liang yi-xin huang Jun Wang Bin-quan Li College of Hydrology and Water Resources Hohai UniversityNanjing 210098China

Estimating the design flood under nonstationary conditions is challenging. In this study, a sample reconstruction approach was developed to transform a nonstationary series into a stationary one in a future time window (FTW). In this approach, the first-order moment (EFTW) of an extreme flood series in the FTW was used, and two possible methods of estimating EFTW values in terms of point values and confidence intervals were developed. Three schemes were proposed to analyze the uncertainty of design flood estimation in terms of sample representativeness, uncertainty from EFTW estimation, and both factors, respectively. To investigate the performance of the sample reconstruction approach, synthesis experiments were designed based on the annual peak series of the Little Sugar Creek in the United States. The results showed that the sample reconstruction approach performed well when the high-order moment of the series did not change significantly in the specified FTW. Otherwise, its performance deteriorated. In addition, the uncertainty of design flood estimation caused by sample representativeness was greater than that caused by EFTW estimation.

关键词： Hydrological frequency analysis Nonstationarity Series reconstruction Uncertainty assessment Changing environment

Sedimentary characteristics and implications for hydrocarbon exploration in a retrograding shallow-water delta:An example from the fourth member of the Cretaceous Quantou Formation in the Sanzhao depression,Songliao Basin,NE China

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Petroleum Science 2022年第3期19卷 929-948页

作者： Quan-Sheng Cai ming-yi hu yi-Ni Liu Oumar-Ibrahima Kane Qing-Jie Deng Zhong-Gui hu hua Li Ngong-Roger Ngia School of Geosciences Yangtze UniversityWuhanHubei 430100China Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of EducationYangtze UniversityWuhanHubei 430100China Department of Geology University of BueaP.O.Box.63BueaCameroon

Based on the analysis of core,logging,and testing data,the fourth member of the Cretaceous Quantou Formation(K_(2)q^(4))in the Sanzhao depression,Songliao Basin,is investigated in order to understand the sedimentary characteristics and hydrocarbon exploration significance of a retrograding shallow-water *** results show that during the sedimentary period of K_(2)q^(4),the Sanzhao depression with a gentle basement experienced stable tectonic subsidence and suffered a long-term lake level rise caused by paleoclimate changes(from semiarid to semihumid),the K_(2)q^(4)in the study area were dominated by a fining-upward deltaic succession and had relatively stable *** the bottom to the top,the color of mudstone gradually changes from purplish-red to gray and grayish-green,the contents of caliche nodules decrease gradually,while the presence of pyrite in sediments becomes *** sandstones mainly composed of siltstone and fine sandstone with developed high-energy sedimentary structures constitute the main sand bodies of deltaic deposits,but the scale of channel sandstones decrease *** the long-term lake level rise and fining-upward sedimentary succession,purplish-red mudstone,caliche nodules and thin channel sandstones are still broadly distributed in the study area,and thin channel sandstones can be found at the top of K_(2)q^(4)covered by the black oil shale of Qingshankou *** assertations suggest that the study area was dominated by retrograding shallow-water delta deposits during the sedimentary period of K_(2)q^(4).In comparison with modern Poyang Lake,we infer that during the sedimentary period of K_(2)q^(4),the study area experienced frequent lake level fluctuations triggered by paleoclimate changes despite the long-term lake level rise,and the lake level fluctuations control the deposition of retrograding shallow-water *** addition,most of the thin channel sandstones distributed at the top of K_(2)q^(4)and cove

关键词： Depositional environment Retrograding shallow-water delta Lake level fluctuation Channel sandstone Hydrocarbon exploration K_(2)q^(4) Songliao Basin

Construction and Validation of a Geometry-based Mathematical Model for the Hard X-Ray Imager

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Research in Astronomy and Astrophysics 2023年第2期23卷 53-72页

作者： Xian-Kai Jiang Jian Wu Deng-yi Chen yi-ming hu Hao-Xiang Wang Wei Liu Zhe Zhang Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023.China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

Quantitative and analytical analysis of the modulation process of the collimator is a great challenge,and is also of great value to the design and development of Fourier transform imaging *** Hard X-ray Imager(HXI),as one of the three payloads onboard the Advanced Space-based Solar Observatory(ASO-S) mission,adopts modulating Fourier-Transformation imaging technique and will be used to explore the mechanism of energy release and transmission in solar flare *** an important step to reconstruct the images of solar flares,accurate modulation functions of HXI are *** this paper,a mathematical model is developed to analyze the modulation function under a simplified condition *** its behavior under six degrees of freedom is calculated after adding the rotation matrix and translation change to the *** addition,unparalleled light and extended sources are also considered so that our model can be used to analyze the X-ray beam ***,applied to the practical HXI conditions,the model has been confirmed not only by Geant4 simulations but also by some verification ***,how this model helps to improve the image reconstruction process after the launch of ASO-S is also presented.

关键词： instrumentation detectors-Sun X-rays-gamma-rays-techniques image processing-methods analytical

Petrological and geochemical characteristics of the Ordovician-Silurian black shale in eastern Sichuan and western hubei,South China:Differential sedimentary responses to tectonism and glaciation

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Journal of Palaeogeography 2023年第1期12卷 129-152页

作者： Quan-Sheng Cai ming-yi hu Oumar Ibrahima Kane Zhi Yang Ya-Ru Wen Qun Luo ming-Tao Li Zhong-Gui hu Qing-Jie Deng Cooperative Innovation Center of Unconventional Oil and Gas Yangtze University(Ministry of Education and Hubei Province)Wuhan 430100Hubei ProvinceChina School of Geosciences Yangtze UniversityWuhan 430100Hubei ProvinceChina Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of Geosciences(Wuhan)Wuhan 430074Hubei ProvinceChina Natural Gas Geology Key Laboratory of Sichuan Province Chengdu 610500Sichuan ProvinceChina Research Institute of Petroleum Exploration and Development PetroChinaBeijing 100083China hubei Geological Survey Wuhan 430034Hubei ProvinceChina Institute of Unconventional Science and Technology China University of Petroleum(Beijing)Beijing 102249China

During the Ordovician-Silurian transition period,the Yangtze area experienced significant environmental changes,which were recorded by the widely distributed black shale of the Upper Ordovician Wufeng and Lower Silurian Longmaxi ***,the petrological and geochemical analyses of the Upper Ordovician-Lower Silurian black shale in Well JY1(eastern Sichuan Basin)and Well YY2(western hubei Province)drill cores show that there are some significant differences with respect to lithology,thickness,and geochemical characteristics despite the long-term similar variation trend in petrology and *** may suggest some major environmental changes and their differential influence on black shale deposition in the Yangtze *** on the analyses of lithology,total organic carbon(TOC),Mo_(EF),and U_(EF),four long-term sedimentary cycles(one for the Wufeng Formation and three for the Longmaxi Formation)were identified in Well *** Well YY2,only three long-term sedimentary cycles can be recognized(one for the Wufeng Formation and two for the Longmaxi Formation).Different from the gradual increase of the geochemical proxies(such as TOC,MoEF,and NiEF)followed by an abrupt decrease in the Wufeng Formation,these proxies of the Silurian sedimentary cycles in both wells exhibit an abrupt increase at the base followed by a gradual decrease,showing that controlling mechanisms for the Lower Silurian black shale deposition in the study areas were different from those of the Upper Ordovician black ***,the black shale of each Silurian cycle in Well JY1 is much thicker than that in Well *** with the thick silty mudstone developed in Well JY1 during the Rhuddanian-Aeronian transition,there is a stratigraphic gap in Well YY2 except for a thin calcareous dolostone formed in a strongly restricted *** differences indicate that tectonism and glacial eustasy should be the key factors for black shale development,but their influences on the depo

关键词： Ordoviciane-Silurian transition Black shale Sedimentary differences Tectonism Paleoclimate Sea-level change Yangtze area

Spectrometer of hard X-ray imager payload onboard the ASO-S mission

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Nuclear Science and Techniques 2019年第8期30卷 92-99页

作者： Yan Zhang Jian-hua Guo Zhe Zhang Deng-yi Chen yi-ming hu Yong-Qiang Zhang Tao Ma Yong-yi huang Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210034China University of Chinese Academy of Sciences Beijing 100049China

A spaceborne hard X-ray spectrometer, composed of an array of 99 scintillation detectors and associated readout electronics, has been developed for the hard X-ray imager(HXI). The HXI is one of the three payloads onboard the advanced space-based solar observatory(ASO-S), which is scheduled to be launched in early 2022 as the first Chinese solar satellite. LaBr3 scintillators and photomultiplier tubes with a super bialkali cathode are used to achieve an energy resolution better than 20% at 30 ***, a new multi-channel charge-sensitive readout application-specific integrated circuit guarantees high-frequency data acquisition with low power consumption. This paper presents a detailed design of the spectrometer for the engineering model of the HXI and discusses its noise and linearity performance.

关键词： Solar radiation detection X-ray spectrometer Hard X-ray imager ASO-S

Research on the On-orbit Background of the Hard X-Ray Imager Onboard ASO-S

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Research in Astronomy and Astrophysics 2022年第9期22卷 116-131页

作者： Wei Liu Deng-yi Chen Xian-Kai Jiang Jian Wu Zhe Zhang yi-ming hu Yang Su Wei Chen Tao Ma Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

The space environment background of various particle fluxes of the Hard X-ray Imager(HXI), one of the payloads of the Advanced Space-based Solar Observatory(ASO-S) spacecraft, is investigated and presented. Different approaches are used to obtain the input information on various space environment particles(protons, alpha particles, electrons, positrons, neutrons, and photons). Some special regions(SAA and radiation belt) are also taken into account. The findings indicate that electrons are the primary background source in the radiation belt. Due to the large background flux generated by electrons, HXI cannot effectively observe solar flares in the radiation *** the radiation belt, primary protons and albedo photons are the main sources of background at low and high magnetic latitudes respectively. The statistical analysis of the flare and background spectra shows that the errors of the flare energy spectrum observation are mainly concentrated in the high energy band, and the detector still has a certain spectrum observation capability for flares of C-class and below in the low energy band of the non-radiation belt. The imaging observation of flares of C-class and below is significantly affected by the accuracy of background subtraction. The energy band with the best signal-to-noise ratio is from 10 to 50 ke V, which can be used to monitor the formation and class of flares.

关键词： instrumentation:detectors Sun:X-rays gamma-rays X-rays:diffuse background (cosmology:)cosmic background radiation

New Diterpenoid Alkaloids from Spiraea japonica var. Ovalifolia

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Chinese Chemical Letters 2001年第2期12卷 147-150页

作者： Guo ying ZUO Hong Ping HE Xin HONG Wei ming Zhu yi ming hu Xiao Sheng YANG Xiao Jiang HAO Laboratory of Phytochemistry Kunming Institute of BotanyChinese Academy of SciencesKunming 650204 Kunming 43 Hospital PLAKunming 650032 The Key Laboratory of Chemistry for Natural Products ofGuizhou Province and Chinese Academy of Sciences Guiyang 550002

Five new diterpenoid alkaloids. 19-O-deethlyspiramine N (1), deacetylspiramine S (2), spiramidine A (3), spiramidine B (4) and deacetylspiramine F (5) were isolated from the aerial parts of Spirae japonica L. f. var o... 详细信息

关键词： Rosaceae Spireae japonica L. f. var. ovalifolia diterpenoid alkaloids