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Evidence for diurnal periodicity of earthquakes from midnight to daybreak

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National Science Review 2019年第5期6卷 1016-1023页

作者： Jinlai Hao jinhai zhang Zhenxing Yao Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences

Previously, inadequate earthquake catalogs and the lack of method made it challenging, if not impossible, to determine the dominant period of earthquake *** the advent of densely distributed seismic stations in Japan since 2002, 410 642 M1.0+ earthquakes have been cataloged under the mainland within30-km depth, which provide a superb dataset to identify the periodicity of *** processed this catalog using time-frequency analyses and daily stacking, which are powerful in extracting weak periodical signal from strong random *** concentrated on the time sector from 0:00 to 6:00(*** midnight to daybreak), which is a reliable time window for much higher detectability of weak earthquakes,since it has the lowest affects from cultural *** successfully observed two apparent periodicities of12-and 24-hour, which are much smaller than the fortnightly periodicity presented previously in the *** earth tides, after intentionally ignoring the contribution from the Moon, present similar dominant periods as the *** may indicate that the dominant period of earthquakes is statistically associated with the Sun rather than the *** daily stacking number of earthquakes using a15-minute or 1-hour interval shows a peak around 1:30, rather than usually expected 3:00 to 4:*** addition, bigger earthquakes show more evident variations in the stacking results, and the trend is very consistent for various lower limits of earthquake magnitude from M1.0 to *** discoveries settled the disputes on the existence of the periodicity of earthquakes since 1886 and may open a window to unravel the mystery of earthquakes.

关键词： periodicity of earthquakes time-frequency analyses ocean tide earth tide Local Mean Time

SHARAD study on the structures and permittivity of a buried impact crater in Martian Central Elysium Planitia

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Science China Earth Sciences 2023年第11期66卷 2452-2462页

作者： Peng FANG Wenzhe FA jinhai zhang Yangting LIN Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Engineering Laboratory for Deep Resources Equipment and Technology Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100029China Institute of Remote Sensing and Geographical Information System School of Earth and Space SciencesPeking UniversityBeijing 100871China

The Elysium Planitia,located in the transition zone between the northern and southern hemispheres,is one of the key areas for studying the stratigraphic structure and geological history of *** studies have shown that this plain has undergone complex surface modification processes including fluvial and volcanic processes,and systematic progress has been made in the study of macro-geological ***,there are relatively few studies on the regional structure of the plain,which restricts our understanding of the regional geological processes.A buried impact crater in the central part of the Elysium Planitia could have recorded the surface modification process since the formation of the impact crater,however,it is difficult to distinguish the subsurface stratigraphy due to the weak orbital radar reflection *** this study,we denoised Shallow Radar data and obtained a radargram with clear subsurface *** estimated the permittivity of subsurface materials via a multilayer reflection *** results show that two subsurface reflectors divide the structure of the buried impact crater into three layers(overlying layer,underlying layer,and bottom layer).The shallow subsurface reflector covers almost the whole impact crater,while the deep subsurface reflector covers only the southwest part of the impact *** the permittivity inversion results with the geological background of lava activity in the Elysium Planitia area,we argue that the overlying layer may be a mixture of regolith and lava flow with low density,while the underlying layer and bottom layer are dense lava *** reflector between the underlying layer and bottom layer is probably a thin deposit derived from weathering between two lava activities,and its possible formation mechanism is as follows:the crater rim and peripheral ejecta has undergone relatively strong wind erosion and the eroded material was transport to the southwestern part of the impact crater,forming

关键词： Mars Elysium Planitia SHARAD Buried crater Permittivity inversion

Dichotomy in crustal melting on early Mars inferred from antipodal effect

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The Innovation 2022年第5期3卷 107-113页

作者： Lei zhang jinhai zhang Ross N.Mitchell Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China

The Martian crustal dichotomy(MCD)between the southern highlands and the northern lowlands is the planet’s most ancient crustal structure,but its origins and evolution remain *** of the MCD comes largely from present-day and shallow crustal *** ancient and deeper constraints,hypotheses for the origin of the MCD range from an early giant impact,partial melting from sustained mantle convection,or some *** investigate with seismological modeling the best-preserved case of the“antipodal effect”-energy from an impact that concentrates and induces uplift and fracturing promoting volcanism at its antipode-the Hellas crater and the Alba Patera volcano on Mars.

关键词： crustal shallow mantle

New delay-decomposing method for stability analysis of genetic regulatory networks with time-varying delays 36

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New delay-decomposing method for stability analysis of genet...

Detecting gravitational wave with an interferometric seismometer array on lunar nearside

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作者： Jin zhang jinhai zhang Liangdong Guo University of Science and Technology Liaoning

ISBN: (纸本)9781538629185

The problem of the stability analysis of genetic regulatory networks（GRNs） with time varying delays are proposed in this paper based on a new delay-decomposing *** appropriate Lyapunov-krasovskiis functionals are defined on each of the obtained subintervals,some integral inequalities and the convex combination technique are utilized to deal with the bound of the derivative of the Lyapunov-krasovskiis *** the criteria are derived in terms of linear matrix inequalities（LMIs）.Finally,a numerical example is used to illustrate the usefulness and less conservative than relative references.

关键词： Genetic Regulatory Networks Stability Time-varying delay Delay-decomposing method

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 203-223页

作者： Junlang Li Fangfei Liu Yuan Pan Zijian Wang Mengdi Cao Mengyao Wang Fan zhang jinhai zhang Zong-Hong Zhu Department of Astronomy Beijing Normal UniversityBeijing 100875China Advanced Institute of Natural Sciences Beijing Normal University at ZhuhaiZhuhai 519087China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Engineering Laboratory for Deep Resources Equipment and Technology Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

Our Moon is by far the easiest natural, extraterrestrial celestial object for us to reach, and many space agencies, in particular the China National Space Administration, have publicized plans for manned missions there. Such high-profile projects must yield commensurate scientific outputs to justify their cost to the taxpayers. An important criterion for the selection of candidate experiments is the extent to which the Moon plays an integral and irreplaceable role, as opposed to offering only marginal advantages over Earth-orbit, space-based alternatives. In this study, we propose an experiment that excels in this regard, which considers the Moon as part of the experimental apparatus. Specifically, the Moon acts as a Weber bar-style resonant mass that responds to deci-Hertz gravitational waves(GWs). GW-excited lunar vibrations can be picked up by an array of(prefabricated on Earth and easy to transport to the Moon) small laser interferometric seismometers yielding GW detection. Such a setup would plug a gap in the GW frequency range already covered by the existing or underdevelopment detectors, and it can inform us on important astrophysics topics, such as the progenitors of Type Ia supernovae(SNe Ia) or intermediate mass black holes. We provide the instrument design as well as its deployment strategy, and we also summarize relevant science cases according to the estimated viable sensitivity.

关键词： gravitational waves lunar antenna seismic motion

Nanomechanics of individual amyloid fibrils using atomic force microscopy

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Chinese Science Bulletin 2010年第16期55卷 1608-1612页

作者： ZHOU XingFei CUI ChengYi zhang jinhai LIU JianHua LIU JingSong Nanomaterials Laboratory College of Sciences Ningbo University Ningbo 315211 China

Compression elasticity of glucagon amyloid fibrils in the transverse direction was investigated by a nanoindentation approach based on atomic force microscopy (AFM).With force-volume mapping, we obtained the correlations between radially applied force and compression of amyloid fibrils, from which the radial compressive elasticity can be *** estimated elastic modulus at three typical locations of fibrils varied from (0.72±0.80) GPa to (1.26±0.62) GPa under small external forces, imply-ing the structural heterogeneity of different fibrils.

关键词：原子力显微镜淀粉纤维纳米力学粉样压缩弹性径向压缩政府采购纳米压痕法

Experimental study of current loss of a single-hole post-hole convolute on the QG I generator

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Plasma Science and Technology 2020年第1期22卷 104-110页

作者： Hanyu WU Zhengzhong ZENG Mengtong QIU Peitian CONG jinhai zhang Xinjun zhang Ning GUO State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi’an 710024People’s Republic of China

The post-hole convolute(PHC),which is used to transport and combine the pulse power flux,is a key component in huge pulsed power *** loss at the PHC is a challenging problem for *** explore a method of reducing the current loss,a single-hole PHC was designed for experiments on the current loss on the Qiang Guang I *** experimental results showed that the current loss at the single-hole PHC is related to the distance/between the vicinity of the cathode hole and the surface of the downstream side of the ***,a single-hole PHC with a blob cathode hole transmitted current more effectively than the PHC with a circle cathode *** relative current loss at the single-hole PHC with the cathode coaled w ith gold foil was about 30%-50% of that with the cathode coated with nickel and titanium *** gap closing speed was also obtained from the current waveforms in the *** speed was 5.74-14.52 cmμs 1 which was different from the classical plasma expansion velocity of 3 cmμs 1.

关键词： plasma post-hole convolute magnetic insulation current loss

Progress of Planetary Science in China

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空间科学学报 2022年第4期42卷 754-771页

作者： HUI Hejiu RONG Zhaojin zhang jinhai HU Sen LIN Honglei WEI Yong LIN Yangting State Key Laboratory for Mineral Deposits Research&Lunar and Planetary Science Institute School of Earth Sciences and EngineeringNanjing UniversityNanjing 210023 Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029

The national and international progress in deep space exploration has greatly promoted the development of planetary science in *** progress in different areas of planetary science has been achieved in *** this report,we summarize the research achievements obtained in China in the last three *** achievements include the research on geology,geochemistry,and space physics of the Moon,Mars,Mercury,Venus,giant planets,asteroids,and *** recent work on science objectives,mission payloads,and analytical capabilities that supports the lunar and deep space exploration program of China has also been introduced in this ***,we report the progress on developments of discipline and research team of planetary science in China.

关键词： Planetary science Progress Exploration Mission Solar system

Study on elastic modulus of individual ferritin

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Chinese Science Bulletin 2009年第3期54卷 723-726页

作者： zhang jinhai CUI ChengYi ZHOU XingFei Department of Physics Ningbo University Ningbo 315211 China

The mechanical property of individual ferritin was measured with force-volume mapping (FV) under contact mode of atomic force microscopy (AFM) in this work. The elastic modulus of individual ferritin was estimated by the Hertz mode. The estimated value of the elastic modulus of individual ferritin was about 250-800 MPa under a small deformation. In addition, the elastic modulus of individual ferritin was compared with that of the colloid gold nanoparticle.

关键词：弹性模量原子力显微镜铁蛋白分子力-体积方法

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