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Effect of hydration on the elasticity of mantle minerals and its geophysical implications

Science China Earth Sciences 2016年第5期59卷 873-888页

作者： mao zhu LI XinYang Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China National Geophysics Observatory at Mengcheng Mengcheng 233500 China

Recent studies have shown that major nominally anhydrous minerals in the Earth's mantle, such as olivine, pyroxene and garnet, can incorporate considerable amounts of water as structurally bound hydroxyl. Even a small amount of water is present in mantle minerals, it can strongly affect a number of physical properties, including density, sound velocity, melting temperature, and electrical conductivities. The presence of water can also influence the dynamic behavior, lead to lateral velocity heterogeneities, and affect the material circulation of the Earth's deep interior. In particular, seismic studies have reported the existence of low-velocity zones in various locations of the Earth's upper mantle and transition zone, which has been expected to be associated with the presence of water in the region. In the past two decades, the effect of water on the elasticity and sound velocities of minerals at relevant pressure-temperature(P-T) conditions of the Earth's mantle attracted extensive interests. Combining the high P-T experimental and theoretical mineralogical results with seismic observations provides crucial constraints on the distribution of water in the Earth's mantle. In this study, we summarize recent experimental and theoretical mineral physics results on how water affects the elasticity and sound velocity of nominally anhydrous minerals in the Earth's mantle, which aims to provide new insights into the effect of hydration on the density and velocity profile of the Earth's mantle, which are of particular importance in understanding of water distribution in the region.

关键词： Water Elasticity Sound velocity Upper mantle Transition zone Olivine polymorphs

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Effects of chemical,mineralogical,and temperature variations on the density and bulk sound velocity of the bottom lower mantle

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Science China Earth Sciences 2016年第10期59卷 2062-2077页

作者： BIAN Hui SUN NingYu mao zhu Laboratory of Seismology and Physics of Earth's Interior School of Earth and Planetary SciencesUniversity of Science and Technology of ChinaHefei 230026China National Geophysics Observatory at Mengcheng Mengcheng 233500China

In this study, we have modeled the density （p） and bulk sound velocity （V.） profiles of the bottom lower mantle using the experimental thermal equation of state （EoS） parameters of lower-mantle minerals, including bridgmanite, ferropericlase, CaSiO3-perovskite, and post-perovskite. We re-evaluated the literature pressure-volume-temperature relationships of these minerals using a self-consistent pressure scale in order to avoid the long-standing pressure scale problem and to provide more reliable constraints on the thermal EoS parameters. With the obtained thermal EoS parameters, we have constructed the p and V. profiles of the bottom lower mantle in different composition, mineralogy, and temperature models. Our modelling results show that the variations of chemistry, mineralogy, and temperature and AI enrichment at the bottom lower mantle can cause an increase have different seismic signatures from each other. The Fe in p but greatly lower V.. A change in mineralogy needs to be considered with the lateral variation in temperature. The cold slabs will be shown as denser regions compared to the normal mantle because of the combined effect of a lower temperature and the presence of a denser post-perovskite at a shallower depth, whereas the hot regions will have a 1-2% lower p than the normal mantle. V, of both cold slabs and hot regions will he lower than the normal mantle when bridgmanite is the dominant phase in the normal mantle, yet they will be greater once bridgmanite transforms into post-perovskite in the normal mantle. Our modeling also shows that the presence of a （Fe, Al）-enriched bridgmanite thermal pile above the core-mantle boundary will exhibit a seismic signature of enhancedp and V., but a reduced Vs, which is consistent with the observed seismic anomalies in the large-low-shear-velocity-provinces （LLSVPs）. The existence of such a （Fe, A1）-enriched bridgmanite thermal pile thus can help to understand the origin of the LLSVPs. These results provide new in

关键词： Bottom lower mantle Density Bulk sound velocity Chemical heterogeneity Temperature

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High-precision deformation monitoring algorithm for GBSAR system: rail determination phase error compensation

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Science China(Information Sciences) 2016年第8期59卷 204-219页

作者： Cheng HU mao zhu Tao ZENG Weiming TIAN Cong mao Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology

In recent years, the repeat-pass GBSAR(ground based synthetic aperture radar) system has demonstrated its capacity to acquire deformation. Nevertheless, in a variety of applications, it needs to measure the deformation with the precision up to 0.1 mm, which could not be reached by utilizing the traditional PS(permanent scatterer) algorithm in most cases. Generally, one of the main reasons could be summarized into the phase error caused by the rail determination error, because the precision of rail determination might degrade during long working hours. However, the traditional PS algorithm could not compensate for the phase error caused by the rail determination error. In order to solve the problems, we modify the conventional PS ***, we deduced the transformation relationship between the rail determination error and its corresponding interferometric phase error. Then, the phase errors caused by the atmosphere and the rail determination error were jointly compensated. The experimental data, which were obtained in Fangshan District in Beijing(China), were used to test and verify the performance of the new algorithm. After the comparison between the results processed by the new algorithm and those processed by the traditional algorithm, the proposed method demonstrated its ability to obtain high-precision deformation.

关键词： permanent scatterer(PS) synthetic aperture radar(SAR) ground-based SAR deformation monitoring radar

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A statistical classification of the unassociated gamma-ray sources in the second Fermi Large Area Telescope Catalog

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Research in Astronomy and Astrophysics 2013年第8期13卷 952-960页

作者： zhu mao Yun-Wei Yu Institute of Astrophysics Central China Normal University

With the assistance of the identified/associated sources in the second Fermi Large Area Telescope （LAT） catalog, we analyze and resolve the spatial distribution and the distributions of the gamma-ray spectral and variability indices of the remaining 575 unassociated Fermi LAT sources. Consequently, it is suggested that the unassociated sources could statistically consist of Galactic supernova remnants/pulsar wind nebulae, BL Lacertae objects, fiat spectrum radio quasars and other types of active galaxies with fractions of 25%, 29%, 41% and 5%, respectively.

关键词： gamma rays: general - catalogs - methods: statistical

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Grating lobes suppression method for stepped frequency GB-SAR system

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Journal of Systems Engineering and Electronics 2014年第6期25卷 987-995页

作者： Tao Zeng Cong mao Cheng Hu mao zhu Weiming Tian Jingjing Ren School of Information and Electronics Beijing Institute of Technology China Academy of Space Technology (CAST)

A grating lobes suppression method for chirp-subpulse stepped frequency（CSSF） signals is proposed, which is applied to deformation monitoring using the ground based synthetic aperture radar（GB-SAR） system. This method is based on accurate estimation and correction of the phase and amplitude error along two dimensions（range and azimuth）, i.e., the error estimation inside the subpulse（in-subpulse error） and across the stepped frequency subpulses（cross-subpulse error） of transmitted CSSF signals. Validated both with simulated data and experimental data recorded in the deformation monitoring campaign, it can be seen that the method as well as the relative conclusions can be fully and effectively applied to most of the stepped frequency systems.

关键词： chirp-subpulse stepped frequency signal(CSSF) sup-pression of grating lobes ground based synthetic aperture radar differential interferometer SAR error analysis

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Perspective for elasticity of minerals in the Earth's top lower mantle

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National Science Review 2021年第4期8卷 11-13页

作者： zhu mao Ningyu Sun Wei Wei Laboratory of Seismology and Physics of Earth's Interior School of Earth and Space SciencesUniversity of Science and Technology of China CAS Center for Excellence in Comparative Planetology University of Science and Technology of China

The lower mantle, ranging from 660 to2891 km in depth, comprises the vast majority of Earth’s volume. Although the Earth’s lower mantle has been regarded as compositionally homogeneous in the first order and isotrop...

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Entanglement teleportation via a couple of quantum channels in Ising–Heisenberg spin chain model of a heterotrimetallic Fe–Mn–Cu coordination polymer

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Chinese Physics B 2019年第12期28卷 105-112页

作者： Yi-Dan Zheng zhu mao Bin Zhou Department of Physics Hubei UniversityWuhan 430062China

We investigate the teleportation of an entangled state via a couple of quantum channels, which are composed of a spin-1/2 Heisenberg dimer in two infinite Ising–Heisenberg chains. The heterotrimetallic coordination polymer CuⅡMnⅡ(L1)][FeⅢ(bpb)(CN)2]·ClO4·H2O(abbreviated as Fe–Mn–Cu) can be regarded as an actual material for this *** apply the transfer-matrix approach to obtain the density operator for the Heisenberg dimer and use the standard teleportation protocol to derive the analytical expression of the density matrix of the output state and the average fidelity of the entanglement teleportation. We study the effects of the temperature T, anisotropy coupling parameter △, Heisenberg coupling parameter J2 and external magnetic field h on the quantum channels. The results show that anisotropy coupling? and Heisenberg coupling J2 can favor the generation of the output concurrence and expand the scope of the successful average fidelity.

关键词： entanglement teleportation Ising–Heisenberg chain transfer-matrix approach concurrence

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DEM generation using bistatic interferometry:high-coherence pixel selection and residual reference phase compensation

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Science China(Information Sciences) 2015年第6期58卷 25-38页

作者： ZENG Tao zhu mao HU Cheng TIAN WeiMing ANTONIOU Michail Beijing Key Laboratory of Embedded Real-time Information Processing Technology Beijing Institute of Technology School of Electronic Electrical and Systems Engineering University of Birmingham

The bistatic spaceborne/stationary In SAR configuration could be applied to generate digital elevation model(DEM). However, two factors limit the DEM precision improvement. On one hand, due to the effects of the illuminator’s sidelobe and the high objects’ shadow, the pixels in the corresponding area might be polluted by the noise. On the other hand, owing to the presence of deviation(between the real value and the nominal value of the master/slave antenna positions), after utilizing the nominal value to compensate for the reference phase, the residual reference phase would remain. In order to solve the problems, we proposed a new bistatic DEM generation algorithm. Firstly, we applied the coherence-phase joint analysis method to select high-coherence points. Secondly, we deduced the transforming relationship from the deviation to the residual reference phase, and then compensated for the residual reference phase. In the experiment, the Yao Gan-3(an L-band spaceborne SAR) was selected as the transmitter and the two stationary receivers were mounted on the top of a tall building. The algorithm recommended in this paper was applied to process the measured bistatic data. The analysis of the results demonstrated that the elevation error of the generated DEM for some targets had been limited to the level of 1–2 m.

关键词： bistatic In SAR high coherence pixel DEM SAR bistatic SAR

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Fabrication of a Bionic Needle with both Super-Hydrophobic and Antibacterial Properties

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Journal of Bionic Engineering 2013年第3期10卷 377-382页

作者： Xin Qi Wei Song zhu mao Wenran Gao Qian Cong Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 P. R. China School of Science Changchun Institute of Technology Changchun 130012 P. R. China State Key Laboratory of Supramolecular Structure and Materials Jilin University Changchun 130012 P. R. China

Many biological surfaces possess unusual micro-nano hierarchical structures that could influence their wettability, which provide new methods for the construction of novel materials. In this work, silver nanoparticles were successfully coated on the surface of stainless steel needle by a simple electroless replacement reaction process between the AgNO3 solution and the activated stainless steel needle. After the replacement reaction, porous micro/nanostructures were formed on the surface of the stainless steel needle. By modifying long chains ofthiol molecules, the stainless steel needle exhibited good super-hydrophobic property with a contact angle greater than 150°. Moreover, the silver coated stainless steel needle （bionic needle） showed strong antibacterial activity against the gram-negative bacterium Escherichia coli （E. colO. By calculating the area of the inhibition zone against E. coil formed on agar medium, the antibacterial activity of the bionic needle with the contact angle of 152° is much better than that with the contact angle of 138°. The as-prepared bionic needle with both super-hydrophobie and antibacterial properties has the potential to be applied in modem medical devices.

关键词： bionic silver stainless steel needle super-hydrophobic property antibacterial property

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Dynamic Alignment of D2 Enhanced by Two Few-cycle Pulses

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Chinese Journal of Chemical Physics 2008年第5期21卷 421-426页

作者： Zeng-qiang Yang Zhi-rong Guo Bao-xiang Yin mao-zhu Sun Key Laboratory of Ecophysics and Department of Physics Normal College Shihezi University Shihezi832003 China

Dynamic alignment of D2 induced by two few-cycle pulses was investigated by solving the time-dependent Schr6dinger equation numerically based on a rigid rotor model. The results show that alignment of D2 can be enhanced by two few-cycle pulses compared with the level achievable by a single few-cycle pulse as long as the time delay between two pulses is chosen properly, and the pulse duration of two lasers plays an important role in the aligning process of D2 molecules.

关键词： Dynamic alignment Few-cycle pulses Pulse duration

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