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Study of spatial resolution of the associated alpha particle imaging–time-of-flight method

Nuclear Science and Techniques 2019年第4期30卷 105-113页

作者： meng Huang Jian-Yu zhu Jun Wu Center for Strategic Studies China Academy of Engineering Physics

Associated alpha particle imaging based on the time-of-flight(API-TOF) technique is an advanced neutron analysis method, which is capable of discriminating material nuclides and three-dimensional imaging of the spatial distribution of material nuclei. In this paper, the spatial resolution of API-TOF and its effects are studied using mathematical analysis and Monte Carlo numerical simulation. The results can provide guidance and assist in designing of API-TOF detection devices. First, a mathematical analysis of the imaging principles of the API-TOF was carried out, and the calculation formulas of the spatial resolution of API-TOF were deduced. Next, the relationship between the device layout and the spatial resolution of the API-TOF detection device was studied. The concept of a typical API-TOF detection device with an optimized structure was proposed. Then, the spatial distribution of the spatial resolution of the typical API-TOF detection device was analyzed, and the effects of the time resolution and the neutron emission angle resolution on the spatial resolution were studied. The results show that spatial resolutions better than 1 cm can be achieved by improving the time resolution and the neutron emission angle resolution to appropriate levels. Finally, a Monte Carlo numerical simulation program was developed for the study of the APITOF and was used to calculate the spatial resolutions of the API-TOF. The comparison of the results shows that thespatial resolutions calculated based on the Monte Carlo numerical simulation are in good agreement with those calculated based on the mathematical analysis. This verifies the mathematical analysis and the evaluation of the effects of the spatial resolution of the API-TOF in this study.

关键词： API-TOF Spatial resolution Mathematical analysis Monte Carlo numerical simulation

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A perspective on general direction and challenges facing antimicrobial peptides

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Chinese Chemical Letters 2017年第4期28卷 703-708页

作者： meng zhu Peng Liu Zhong-Wei Niu Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The emergence of drug resistant bacterium threatens the global public healthcare *** urgent need to obtain new antimicrobials has driven antimicrobial peptides（AMPs） research into *** we give a brief introduction of the recent progress of AMPs regarding their structures,properties,production and modification,and antimicrobial ***,this review will give an insight into the trends and challenges facing on this particular kind of antimicrobial materials.

关键词： Antimicrobial peptides(AMPs) Drug resistance Biomaterials Antimicrobial materials Antimicrobial mechanism

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Thorium distribution on the Moon:new insights from Chang’E-2 gamma-ray spectrometer

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Research in Astronomy and Astrophysics 2019年第6期19卷 1-14页

作者： meng-Hua zhu Jin Chang Tao Ma State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and Technology Taipa Macao China Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210034 China CAS Center for Excellence in Comparative Planetology Hefei 230026 China

We present the thorium distribution on the lunar surface derived from observations by the Chang’E-2 gamma-ray spectrometer(CE-2 GRS). This new map shows a similar thorium distribution to previous observations. In combination with this new thorium map and impact cratering model, we investigate the origination of thorium on the Moon’s highlands, which was previously thought to be contributed from Imbrium ejecta. We found that the Imbrium ejecta has a small contribution(~20%–30%) to the thorium on the lunar highlands but most thorium is likely to be indigenous before the deposition of the Imbrium ejecta. This new thorium map also confirms that the eastern highlands have a relatively higher thorium concentration than the western highlands. We propose that the thin crust and large basins on the eastern highlands are responsible for this difference in thorium.

关键词： Moon-Chang'E-2 Gamma-ray Spectrometer-Thorium distribution

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Effect of Complex Agents on Structure and Activity of Fe-Substituted Rare Earth Hexaaluminate Catalysts for Methane Combustion

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Journal of Rare Earths 2004年第z1期22卷 181-184页

作者： Wu Peng Hu Ruisheng long Zerong meng He College of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 China College of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 China College of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 China College of Chemistry and Chemical Engineering Inner Mongolia University Hohhot 010021 China

A series of catalysts were prepared by using complex sol-gel *** results confirm the effect of different agents on structure and activity of Fe-substituted rare earth hexaaluminate catalyst (LaFeAl11 O19 ) for methane *** catalyst is yielded by complex sol-gel, respectively using three different complex agents (maltose, glucose and citric acid).XRD demonstrated that haxaaluminate is the major phase of catalyst prepared by maltose,while LaAlO3 is the major one of the catalyst by glucose and citric *** the same time, there is a little LaFeO3 and surface areas as well as 29.5 nm particle diameter when the complex agent is ***, T10 ( temperature for 10% conversion of methane) and T100 ( temperature for 100% conversion of methane) for catalyst by glucose is 543 and 758 ℃, which is the best among the three complex agents for methane combustion.

关键词： hexaaluminate sol-gel methane combustion complex agent rare earths

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Normalized Excited Squeezed Vacuum State and Its Applications

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Communications in Theoretical Physics 2007年第5期47卷 927-932页

作者： meng Xiang-Guo WANG Ji-Suo LIANG Bao-long Department of Physics Liaocheng University Liaocheng 252059 China

By using the intermediate coordinate-momentum representation in quantum optics and generating function for the normalization of the excited squeezed vacuum state （ESVS）, the normalized ESVS is obtained. We find that its normalization constants obtained via two new methods are uniform and a new form which is different from the result obtained by Zhang and Fan [Phys. Lett. A 165 （1992） 14]. By virtue of the normalization constant of the ESVS and the intermediate coordinate-momentum representation, the tomogram of the normalized ESVS and some useful formulae are derived.

关键词： ESVS technique of integration within an ordered product of operators intermediate coordinate- momentum representation generating function

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Some Properties of Two-mode Displaced Excited Squeezed Vacuum States

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Communications in Theoretical Physics 2009年第9期52卷 493-499页

作者： meng Xiang-Guo WANG Ji-Suo LIANG Bao-long Department of Physics Liaocheng University Liaocheng 252059 China

In this paper,two-mode displaced excited squeezed vacuum states (TDESVS) are constructed and theirnormalization and completeness are *** the entangled state representation and Weyl ordering formof the Wigner operator,the Wigner functions of TDESVS are obtained and the variations of Wigner functions withthe parameters m,n and r are ***,two marginal distributions of Wigner functions of TDESVS areobtained,which exhibit some entangled properties of the two-particle's system in TDESVS.

关键词： two-mode displaced excited squeezed vacuum state Weyl ordering Wigner function marginal distribution entangled state representation

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Two-Mode Excited Squeezed Vacuum State and Its Properties

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Communications in Theoretical Physics 2008年第5期49卷 1299-1304页

作者： meng Xiang-Guo WANG Ji-Suo LIANG Bao-long Department of Physics Liaocheng University Liaocheng 252059 China

In this paper, the two-mode excited squeezed vacuum state （TESVS） is studied by using the statistical method. By calculating the normalization of the TESVS, a new form of Jacobi polynomials and some new identities are obtained. The photon number distribution of the TESVS is given and it is a simple form of Jacobi polynomials. Using the entangled state representation of Wigner operator, the Wigner function of the TESVS is obtainded and the variations of the Wigner function with the parameters m, n, and r are discussed. Here from the phase space point of view the TESVS can be well interpreted and described.

关键词： two-mode excited squeezed vacuum state photon number distribution Wigner function entangled state representation

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Husimi Functions of Excited Squeezed Vacuum States

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Communications in Theoretical Physics 2009年第9期52卷 487-492页

作者： meng Xiang-Guo WANG Ji-Suo LIANG Bao-long Department of Physics Liaocheng University Liaocheng 252059 China

Based on the Husimi operator in pure state form introduced by Fan et al,which is a squeezed coherentstate projector,and the technique of integration within an ordered product (IWOP) of operators,as well as the entangledstate representations,we obtain the Husimi functions of the excited squeezed vacuum states (ESVS) and two marginaldistributions of the Husimi functions of the ESVS.

关键词： excited squeezed vacuum state IWOP technique entangled state representation Husimi operator Husimi function marginal distribution

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Knocking-Out OsPDR7 Triggers Up-Regulation of OsZIP9 Expression and Enhances Zinc Accumulation in Rice

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Rice science 2023年第1期30卷 36-49页

作者： meng Lu TANG Mingfeng zhu Yuxing TAN longtao Key Laboratory of Agro-ecological Processes in Subtropical Region Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125China University of Chinese Academy of Sciences Beijing 100049China Institute of Agricultural Quality Standard and Testing Technology Chongqing Academy of Agricultural SciencesChongqing 401329China

Zinc(Zn) is an essential trace mineral that is required for plant growth and development. A number of protein transporters, which are involved in Zn uptake, translocation and distribution, are finely regulated to maintain Zn homeostasis in plant. In this study, we functionally characterized an ATP-binding cassette(ABC) transporter gene, OsPDR7, which is involved in Zn homeostasis. Os PDR7 encodes a plasma membrane-localized protein that is expressed mainly in the exodermis and xylem in the rice ***7 mutants resulted in higher Zn accumulation compared with the wild type. Heterogeneous expression of OsPDR7 in a yeast mutant rescued the Zn-deficiency phenotype, implying transport activity of OsPDR7 to Zn in yeast. However, no ZIP genes except for OsZIP9 showed change in expression profile in the ospdr7 mutants, which suggested that OsPDR7 maintains cellular Zn homeostasis through regulating Os ZIP9 expression. RNA-Seq analysis further revealed a set of differentially expressed genes between the wild type and ospdr7 mutants that allowed us to propose a possible OsPDR7-associated signaling network involving transporters, hormone responsive genes, and transcription factors. Our results revealed a novel transporter involved in the regulation of Zn homeostasis and will pave the way toward a better understanding of the fine-tuning of gene expression in the network of transporter genes.

关键词： OsPDR7 OsZIP9 zinc metal accumulation rice ATP-binding cassette transporter

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Dynamic Response of 6MW Spar Type Floating Offshore Wind Turbine by Experiment and Numerical Analyses

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China Ocean Engineering 2020年第5期34卷 608-620页

作者： meng long HE Yan-ping ZHAO Yong-sheng YANG Jie YANGHe HAN Zhao-long YU long MAO Wen-gang DU Wei-kang a State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China b Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai Jiao Tong UniversityShanghai 200240China c School of Naval Architecture Ocean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China d China Aerodynamics Research and Development Center Mianyang621000China e Ocean Engineering Department Texas A&M UniversityCollege StationTX 77843USA f Department of mechanics and Maritime Sciences Chalmers University of Technology41296GothenburgSweden g Ocean Engineering Group Department of CivilArchitecture and Environmental EngineeringUniversity of Texas at AustinTexasTX 78712USA

The floating offshore wind turbine(FOWT) is widely used for harvesting marine wind energy. Its dynamic responses under offshore wind and wave environment provide essential reference for the design and installation. In this study,the dynamic responses of a 6 MW Spar type FOWT designed for the water depth of 100 m are investigated by means of the wave tank experiment and numerical analysis. A scaled model is manufactured for the experiment at a ratio of65.3, while the numerical model is constructed on the open-source platform FAST(Fatigue, Aerodynamics,Structures, and Turbulence). Still water tests, wind-induced only tests, wave-induced only tests and combined windwave-current tests are all conducted experimentally and numerically. The accuracy of the experimental set-up as well as the loading generation has been verified. Surge, pitch and heave motions are selected to analyze and the numerical results agree well with the experimental values. Even though results obtained by using the FOWT calculation model established in FAST software show some deviations from the test results, the trends are always consistent. Both experimental and numerical studies demonstrate that they are reliable for the designed 6 MW Spar type FOWT.

关键词： floating offshore wind turbine dynamic responses Spar type platform FAST model test

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