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The“harmful algae and algal toxins in coastal waters of China:investigation and database”project

Journal of Oceanology and Limnology 2022年第6期40卷 2081-2093页

作者： tian yan CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

The“harmful algae and algal toxins in coastal waters of China:investigation and database”project(HAATC)is funded(US$2.3 million)by the Ministry of Science and Technology of China for 60 months starting on the 1st Jan *** the 1990s,national projects and other related work have greatly improved harmful algal bloom(HAB)research in ***,the existing research on HABs is often limited to specific sea areas or specific algal bloom disasters,which is insufficient for understanding the long-term evolution of HAB occurrence under the influence of intensified human activity and global *** HAATC project intends to determine the overall distribution of marine harmful microalgae and macroalgae,and marine algal toxins(in phytoplankton and shellfish)through a large-scale investigation in the coastal waters of China and continuous investigation in key sea *** also aims to observe biotic and abiotic processes during harmful red tides and green tides,and establish an open database and query platform of HABs in *** research consortium,led by chief scientist *** yan,includes approximately 100 scientists and *** than 2 years of work have shown the increased distribution of HAB species(including cysts)and algal toxins in China’s coastal waters,the increased occurrence of macroalgae blooms(mainly by Ulva prolifera and Sargassum horneri)in the Southern Yellow Sea,increased amount of causative species being identified due to the use of molecular technologies in taxonomy,and new records of algal toxins such as azaspiracid,cycloimines and neurotoxinsβ-N-methylamino-l-alanine have been detected,which complicates the research in algal toxins and ***,the project will provide systematic basic data and techniques for the rapid and accurate identification of harmful algae species to support the research,monitoring,and control of harmful algal blooms,as well as seafood safety management in China.

关键词： harmful algae algal toxins coastal waters of China database

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Evasion guidance algorithms for air-breathing hypersonic vehicles in three-player pursuit-evasion games

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Chinese Journal of Aeronautics 2020年第12期33卷 3423-3436页

作者： tian yan Yuanli CAI Bin XU School of Electronic and Information Engineering Xi'an Jiaotong UniversityXi'an 710049China School of Automation Northwestern Polytechnical UniversityXi'an 710072China

In practical combat scenario,the cooperative intercept strategies are often carefully designed,and it is challenging for the hypersonic vehicles to achieve successful *** on the analysis,it can be found that if several Successive Pursuers come from the Same Direction(SPSD)and flight with a proper spacing,the evasion difficulty may increase *** address this problem,we focus on the evasion guidance strategy design for the Air-breathing Hypersonic Vehicles(AHVs)under the SPSD combat *** order to avoid the induced influence on the scramjet,altitude and speed of the vehicle,the lateral maneuver and evasion are *** guarantee the remnant maneuver ability,the concept of specified miss distance is introduced and utilized to generate the guidance command for the *** the framework of constrained optimal control,the analytical expression of the evasion command is derived,and the constraints of the overload can be ensured to be never *** fact,by analyzing the spacing of the pursers,it can be classified whether the cooperative pursuit is *** the coordination-unformed multiple pursers,the evasion can be achieved lightly by the proposed *** the coordination is formed,the proposed method will generate a large reverse direction maneuver,and the successful evasion can be maintained as a *** performance of the proposed algorithms is tested in numerical simulations.

关键词： Differential game theory Game theory Hypersonic vehicles Optimal control Pursuit-evasion strategy

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Influences of a Kind of Groove-blade on the Flow Field in a Compressor Cascade

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Journal of Thermal Science 2006年第3期15卷 193-199页

作者： Hongwei MA Wuying yan Qiao tian School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100083 ChinaNational Key Laboratory on Aero-Engines Beijing 100083 China

This paper presents an experimental investigation of effects of a kind of streamwise-grooved blades on the flowfield in a compressor *** flow field downstream the cascade and the boundary layer on the suctionsurface were measured using a mini 5-hole pressure probe at different incidence *** flow field in thegroove cascade was compared with that in the smooth *** measurement results indicate that:(1)thegroove surface can restrain the development of the boundary layer on the suction surface;(2)the grooves canrestrain the radial migration of the low-energy fluids in the boundary layer on the suction surface;(3)the grooveblades can reduce total pressure loss and flow blockage in the cascade at the incidence angles of 0°,5°and 8°;(4)the maximum benefit of 8.6% loss reduction was obtained at the incidence angle of 5° while negative benefit of-3.0% loss reduction occurred at the incidence angle of-5°.

关键词： groove blade compressor cascade secondary flow flow loss boundary layer

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Single foggy image restoration based on spatial correlation analysis of dark channel prior

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Journal of Systems Engineering and Electronics 2014年第4期25卷 688-696页

作者： yan tian Dong Xia Yiping Xu National Key Laboratory of Science and Technology on Multi-spectral Information Processing Huazhong University of Science and Technology

Focusing on the degradation of foggy images, a restora- tion approach from a single image based on spatial correlation of dark channel prior is proposed. Firstly, the transmission of each pixel is estimated by the spatial correlation of dark channel prior. Secondly, a degradation model is utilized to restore the foggy image. Thirdly, the final recovered image, with enhanced contrast, is obtained by performing a post-processing technique based on just-noticeable difference. Experimental results demonstrate that the information of a foggy image can be recovered perfectly by the proposed method, even in the case of the abrupt depth changing scene.

关键词： foggy image image restoration dark channel prior,spatial correlation.

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Theoretical Study on Mechanism of Reaction of OH with HO2NO2

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Chinese Journal of Chemical Physics 2008年第1期21卷 32-38页

作者： yan tian tian-jing He Li He Fan-chen Liu Dong-ming Chen Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Department of Electronic Science and Technology University of Science and Technology of ChinaHefei 230025 China School of Science Anhui Agricultural University Hefei 230036 China

The reaction of HO2NO2 （peroxynitric acid, PNA） with OH was studied by the hybrid density functional B3LYP and CBS-QB3 methods. Based on the calculated potential energy surface, five reaction channels, H20＋NO2＋O2, HOOH＋NO3, NO2＋HO3H, HO2＋HONO2 and HO2＋HOONO, were examined in detail. The major reaction channel is PNA＋OH→M1→TS1→H2O＋NO2＋O2. Taking a pre-equilibrium approximation and using the CBS-QB3 energies, the theoretical rate constant of this channel was calculated as 1.13×10-12 cm^3/（molecule s） at 300 K, in agreement with the experimental result. Comparison between reactions of HOONO2＋OH and HONO2＋OH was carried out. For HOR＋OH reactions, the total rate constants increase from R=NO2 to R=ONO2, which is consistent with experimental measurements.

关键词： Reaction Peroxynitric acid ab initio calculation Rate constant

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Testing Regression Coefficients in High-Dimensional and Sparse Settings

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Acta Mathematica Sinica,English Series 2021年第10期37卷 1513-1532页

作者： Kai XU yan tian Qing CHENG School of Mathematics and Statistics Anhui Normal UniversityWuhu 241002P.R.China Center for Quantitative Medicine Duke-NUS Medical SchoolNational University of SingaporeSingapore 169856

In the high-dimensional setting,this article considers a canonical testing problem in multivariate analysis,namely testing coefficients in linear regression *** tests for highdimensional regression coefficients have been proposed in the recent ***,these tests are based on the sum of squares type statistics,that perform well under the dense alternatives and suffer from low power under the sparse *** order to attack this issue,we introduce a new test statistic which is based on the maximum type statistic and magnifies the sparse *** limiting null distribution of the test statistic is shown to be the extreme value distribution of type I and the power of the test is *** particular,it is shown theoretically and numerically that the test is powerful against sparse *** studies are carried out to examine the numerical performance of the test and to compare it with other tests available in the literature.

关键词： Extreme value distribution high-dimensional linear models maximum-type-test

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Theoretical Study on Reaction Mechanism of Aluminum-Water System

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Chinese Journal of Chemical Physics 2008年第3期21卷 245-249页

作者： Yun-lan Sun yan tian Shu-fen Li Department of Chemical Physics University of Science and Technology of China Hefei 230026 China School of Metallurgy and Resources Anhui University of Technology Maanshan 243002 China

A theoretical study on the reaction of aluminum with water in the gas phase was performed using the hybrid density functional B3LYP and QCISD（T） methods with the 6-311＋G（d,p） and the 6-311＋＋G（d,p） basis sets. The results show that there are three possible reaction pathways that involve four isomers, seven transition structures, and two possible products for the reaction of aluminum with water. The two most favorable reaction pathways were found, whose intermediates and products agreed quite well with experimental results. The enthalpy and Gibbs free energy change of the reaction between A1 and H2O at 298 and 2000 K were calculated. Some results are also in good agreement with the previous calculations or experimental results.

关键词： Aluminum Water Reaction mechanism Hybrid density functional theory

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Role of autoimmunity in primary biliary cirrhosis

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World Journal of Gastroenterology 2012年第48期18卷 7141-7148页

作者： tian-yan Shi Feng-Chun Zhang Department of Rheumatology and Clinical Immunology Peking Union Medical College HospitalChinese Academy of Medical Science

Primary biliary cirrhosis(PBC) is an autoimmune liver disease characterized by the presence of serum autoantibodies and chronic nonsuppurative destructive *** pathogenesis of PBC involves environmental factors,genetic predisposition and loss of immune *** recent years,it has become univocally accepted that an inappropriately activated immune response is one of the most important factors in *** this study,the role of autoimmunity in PBC is summarized and a feasible research orientation is recommended.

关键词： Primary biliary cirrhosis Autoimmunity Humoral immunity Cellular immunity Nonspecific immunity

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The plant-enhanced bio-cathode:Root exudates and microbial community for nitrogen removal

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Journal of Environmental Sciences 2019年第3期31卷 97-103页

作者： Henan Li Youpeng Qu yan tian Yujie Feng School of Environment Harbin Institute of Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology School of Life Science and Technology Harbin Institute of Technology Heilongjiang Academy of Chemical Engineering Harbin FengGe Ecological Environmental Science and Technology Company

A plant bio-electrochemical system(PBES) was constructed for organic pollutant removal and power generation. The bio-cathode, composed of granular activated carbon(GAC), stainless wire mesh and a plant species(Triticum aestivum L.), was able to catalyze cathodic reactions without any requirement for aeration or power input. During the 60-day-long operation, an average voltage of 516 m V(1000 Ω) and maximum power density(Pmax) of 0.83 W/m^3 were obtained in the PBES. The total nitrogen removal and total organic carbon removal in the PBES were 85% and 97%, respectively. Microbial community analyses indicated that bacteria associated with power generation and organic removal were the predominant species in the bio-cathode, and plant-growth-promoting rhizobacteria were also found in the PBES. The results suggested that the coupling of plants with the GAC cathode may enhance the organicmatter degradation and energy generation from wastewater and therefore provide a new method for bio-cathode design and promote energy efficiency.

关键词： Plant bio-electrochemical system Bio-cathode Root exudates Nitrogen removal

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A highly selective fluorescent probe for real-time imaging of UDP-glucuronosyltransferase 1A8 in living cells and tissues

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Frontiers of Chemical Science and Engineering 2022年第1期16卷 103-111页

作者： Mingyue Zhu Zhenhao tian Lingling Jin Xiaokui Huo Chao Wang Jingnan Cui yan tian Xiangge tian Lei Feng College of Pharmacy School of MedicineKey Laboratory of Elemene Class Anti-Cancer Chinese MedicinesEngineering Laboratory of Development and Application of Traditional Chinese MedicinesHangzhou Normal UniversityHangzhou 311121China Dalian Key Laboratory of Metabolic Target Characterization and Traditional Chinese Medicine Intervention College of PharmacyCollege of Integrative MedicineDalian Medical UniversityDalian 116044China School of Life Sciences Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China

Uridine diphosphate(UDP)-glucuronosyltransferases(UGTs)are enzymes involved in the biotransformation of important endogenous compounds such as steroids,bile acids,and hormones as well as exogenous substances including drugs,environmental toxicants,and ***,a novel fluorescent probe BDMP was developed based on boron-dipyrromethene(BODIPY)with high sensitivity for the detection of *** glucuronidation of BDMP not only exhibited a redemission wavelength(lex/lem=500/580 nm),but also displayed an excellent UGT1A8-dependent fluorescence signal with a good linear relationship with UGT1A8 *** on this perfect biocompatibility and cell permeability,BDMP was successfully used to image endogenous UGT1A8 in human cancer cell lines(LoVo and HCT15)in real *** addition,BDMP could also be used to visualize UGT1A8 in tumor *** results suggested that BDMP is a promising molecular tool for the investigation of UGT1A8-mediated physiological function in humans.

关键词： UDP-glucuronosyltransferase 1A8 fluorescent probe subtype selectivity fluorescence imaging

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