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Synthetic Control Method for Crystallite Size of MOF-5

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Chemical Research in Chinese Universities 2014年第3期30卷 356-361页

作者： HAN Pengfei YUAN Changfu xu junyi LIU Jin School of Metallurgy and Environment Central South University Changsha 410083 t~ R. China

We reported a dripping solvothermal method for synthesizing metal-organic framework-5（MOF-5）. It started from separately dissolving Zn（NO3）2 and terephthalic acid（H2BDC） in dimethyl formamide（DMF）, and then dripping one solution into the other. Results of SEM, XRD and laser particle size distribution show that regular cubic-shaped and micro-crystallite powder of MOF-5 can be obtained. The d0.5（volume-median-diameter） values are 4.32 μm for particles prepared by dripping Zn（NO3）2 into H2BDC（ZH） and 9.32 μm for those prepared by dripping H2BDC into Zn（NO3）2（HZ）, much smaller than 22,7 μm that of particles prepared by the traditional adding water solvothermal method（L）. The standard deviations of the particle size distributions fitted by the GaussAmp model are 2.49, 4.38 and 15.4 respectively for ZH, HZ and L, further revealing narrower size distributions of particles prepared by the dripping method. In addition, the Langmuir specific surface areas are 923 m^2/g for ZH and 868 m^2/g for HZ. The TGA results present mass losses of 4.18% and 3.62% at 105 ℃, 17.19% and 14.78% at 245 ℃, 39.04% and 34.85% at 600℃ separately for ZH and HZ, which correspond to the removal of H20, DMF and the decomposition of MOF-5. This indicates that MOF-5 has a strong adsorption ability for small molecules. Besides, the mass loss of 48.39%（ZH） and 41.02%（HZ）between 400 ℃ and 600 ℃ are less than the theoretical value of 57.81% for MOF-5 decomposition to ZnO, suggesting that an impure phase with an extra amount of ZnO may exist in the cavities of MOF-5.

关键词： Metal-organic framework-5(MOF-5) Dripping solvothermal method Size distribution

GNSS receiver autonomous integrity monitoring(RAIM)algorithm based on robust estimation

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Geodesy and Geodynamics 2016年第2期7卷 117-123页

作者： Yuanxi Yang junyi xu State Key Laboratory of Geo-information Engineering Xi'an 710054China Xian Research Institute of Surveying and Mapping Xi'an 710054China Beijing Satellite Navigation Center Beijing 100094China

Integrity is significant for safety-of-life applications. Receiver autonomous integrity monitoring（RAIM） has been developed to provide integrity service for civil aviation. At first,the conventional RAIM algorithm is only suitable for single fault detection, single GNSS constellation. However, multiple satellite failure should be considered when more than one satellite navigation system are adopted. To detect and exclude multi-fault, most current algorithms perform an iteration procedure considering all possible fault model which lead to heavy computation burden. An alternative RAIM is presented in this paper based on multiple satellite constellations（for example, GPS and Bei Dou（BDS） etc.） and robust estimation for multi-fault detection and exclusion, which can not only detect multi-failures,but also control the influences of near failure observation. Besides, the RAIM algorithm based on robust estimation is more efficient than the current RAIM algorithm for multiple constellation and multiple faults. Finally, the algorithm is tested by GPS/Bei Dou data.

关键词： GNSS Integrity Receiver autonomous integrity monitoring(RAIM) Robust estimation Fault detection

Lysobacter hymeniacidonis sp. nov., Isolated from a Crude Oil-Contaminated Marine Sponge

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Journal of Ocean University of China 2015年第6期14卷 1019-1024页

作者： XIN Yanjuan QU Junge xu junyi WU Peichun CAO xupeng xuE Song Marine Bioproducts Engineering Group Dalian Institute of Chemical PhysicsChinese Academy of Sciences Department of Biology and Pharmacy Zhejiang Pharmaceutical College Liaoning Entry-Exit Inspection and Quarantine Bureau

An aerobic, Gram-negative bacterium, strain 2-5~T, was isolated from a crude oil-contaminated marine sponge collected near Dalian Bay, China, and subjected to a polyphasic taxonomic investigation. Cells of strain 2-5~T were non-spore forming, non-motile, rods 0.2–0.3 μm wide and 1.1–1.2μm long. Strain 2-5~T grew well on nutrient agar, ~TSA, R2 A agar and LB agar. Colonies of strain 2-5~T on LB agar were circular, smooth with entire margins, non-transparent and pale yellow after 3 d of incubation at 30℃. Growth of strain 2-5~T occurred in LN medium with 0–6% Na Cl; no growth occurred in the presence of 8.0% NaCl. Strain 2-5~T grew at 15–42℃ and at pH 6.0–8.0. Comparative 16 S r RNA gene sequence analysis showed that strain 2-5~T clustered with the species of the genus Lysobacter. Its closet neighbors were the type strains of Lysobacter concretionis KC^TC 12205~T(97% similarity), Lysobacter arseniciresistens ZS79~T(96%), and Lysobacter defluii APB-9 ~T(96%). ~The value for DNA-DNA relatedness between strain 2-5~~T and L. concretionis KC^TC 12205 ~T was 23%. Branched fatty acids iso-C16: 0, iso-C15: 0, iso-C11: 0 3-OH, iso-C17: 1ω9c and iso-C11: 0 were found to be predominant. ~The major polar lipids were diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylglycerol. Strain 2-5~T had a DNA G+C content of 63.8 mol%. On the basis of the phenotypic, chemotaxonomic, DNA-DNA hybridization and phylogenetic data, strain 2-5~T represents a novel species of the genus Lysobacter, for which the name Lysobacter hymeniacidonis sp. nov. is proposed. ~The type strain is 2-5~T(=CGMCC 1.12190 ~T = JCM 18137~T).

关键词： Lysobacter hymeniacidonis sp.nov. taxonomy phylogenetic analysis

Contribution of the Compass satellite navigation system to global PNT users

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Chinese Science Bulletin 2011年第26期56卷 2813-2819页

作者： YANG YuanXi LI JinLong xu junyi TANG Jing GUO HaiRong HE HaiBo China National Administration ofGNSS andApplications Beijing 100088 China Institute of Surveying and Mapping Information Engineering University Zhengzhou 450052 China Beijing Global Information Center of Application and Exploitation Beijing 100094 China

As one of the four global satellite navigation systems,Compass not only enhances satellite visibility and availability for positioning,navigation and timing (PNT) for users in China and the surrounding areas,but also improves PNT precision for global *** improvements in satellite visibility and the dilution of precision are analyzed under GNSS compatibility and interoperation *** contribution of the Compass satellite navigation system to global users,especially the benefits that users can acquire from the combination of Compass,GPS,GLONASS,and Galileo navigation systems,is analyzed using simulation data.

关键词：北斗卫星导航系统 PNT 用户全球卫星导航系统全球导航卫星系统 GLONASS 伽利略导航系统周边地区

Absolute quantitative detection of genetically modified soybean MON87708×MON89788 with stacked traits by digital polymerase chain reaction

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Oil Crop Science 2022年第4期7卷 180-188页

作者： junyi xu Xin Li Jinglian Bai Ying Liu Shaojie Wang Yueting Liu Chunguang Yang Technology Center of Dalian Customs District DalianChina Logistics Management Center of Dalian Customs District DalianChina

The main advantage of digital PCR(dPCR) is that it facilitates absolute quantification of the target without reference to the standard/calibration *** droplet dPCR has a three-color staining detection function,which enables multiplex PCR *** this study,this technique was used to establish triple dPCR detection for the genetically modified soybean MON87708 × MON89788 with stacked *** absolute quantitative detection was accomplished for the genomic DNA extracted from the homogenized seeds of GM stack MON87708× MON89788 *** results can serve as a reference for the absolute quantitative detection of stacked events of genetically modified crops.

关键词： Absolute quantification Digital PCR Genetically modified soybean MON87708×MON89788 Stacked event

Integrity analysis of COMPASS and other GNSS combined navigation

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Science China Earth Sciences 2013年第10期56卷 1616-1622页

作者： xu junyi YANG YuanXi LI JinLong HE HaiBo GUO HaiRong Institute of Surveying and Mapping Information Engineering University Xi'an Information Division of Surveying & Mapping State Key Laboratory of Geo-Information Engineering Xi'an Institute of Surveying and Mapping Beijing Satellite Navigation Center

The integrity requirement should be satisfied when GNSS is used in *** are now two ways for integrity monitoring,that is,receiver autonomous integrity monitoring(RAIM) and GNSS integrity channel(GIC) based on augmentation *** rapid development of the Beidou satellite navigation system(COMPASS) will significantly improve the satellite ***,the effects of first order ionosphere delay will be mitigated by the combination of GNSS multi-frequency *** availability of RAIM will be enhanced,which makes it possible to provide a worldwide seamless integrity service for aviation by using *** contribution of COMPASS to the availability of RAIM is analyzed by simulation;and the integrity requirement of which aviation approaching phrase can be satisfied when using COMPASS single system and its combination with other satellite navigation system is ***,the influence of user range accuracy(URA) of COMPASS on integrity performance is discussed.

关键词： Integrity analysis of COMPASS and other GNSS combined navigation

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Broadband and conformal metamaterial absorber

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Frontiers of Optoelectronics 2017年第2期10卷 124-131页

作者： Xiangkun KONG junyi xu Jin-jun MO Shaobin LIU Key Laboratory of Radar Imaging and Microwave Photonics Ministry of Education College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China State Key Laboratory of Millimeter Waves Southeast University Nanjing 210096 China College of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China

In this study, a new broadband and conformal metamaterial absorber using two flexible substrates was proposed. Simulation results showed that the proposed absorber exhibited an absorption band from 6.08 to 13.04 GHz and a high absorption of 90%, because it was planar. The absorber was broadband as its relative absorption bandwidth was 72.8%. Moreover, the proposed absorber was insensitive to the polarization of the TE and TM waves. The absorber was ultra-thin; its total thickness was only 0.072 at the lowest operating frequency. Furthermore, different regions of absorption can be adjusted by lumping and loading two resistors onto the polyimide film, respectively. Moreover, compared with the conventional microwave absorber, the absorption bandwidth of the proposed absorber can be broadened and enhanced when it was bent and conformed to the surface of objects. Experimental and simulation results were in agreement. The proposed absorber is a promising absorbing element in scientific and technical applications because of its broad- band absorption, polarization insensitivity, and flexible substrates.

关键词： absorber metamaterials flexible broadband,conformal

《青色魇》:沈从文40年代对佛经故事的重说

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吉首大学学报（社会科学版） 2010年第1期31卷 44-49页

作者：许君毅中国社会科学院研究生院北京100102

写于1946年的《青色魇》,讲述了佛经典籍《法苑珠林》中驹那罗王子的故事。同《七色魇》其他文章一样,《青色魇》也呈现出晦涩难解的文本状态,评论多将之称为"抽象的抒情"。从佛经故事重说的角度将之与上世纪30年代的《月下小景》进行比... 详细信息

写于1946年的《青色魇》,讲述了佛经典籍《法苑珠林》中驹那罗王子的故事。同《七色魇》其他文章一样,《青色魇》也呈现出晦涩难解的文本状态,评论多将之称为"抽象的抒情"。从佛经故事重说的角度将之与上世纪30年代的《月下小景》进行比较,不难剖析这种"抽象抒情"文风形成的深层原因。

关键词：青色魇佛经故事重说变形抽象抒情

Performance Analysis of COMPASS/GPS Differential Positioning

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Performance Analysis of COMPASS/GPS Differential Positioning