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China CDC weekly 2023年第46期5卷 1029-1037,I0005-I0007页

作者： Kaiqiang yu Bixi Zhao yuxi Yan Qing Yang Liming Chen yu xia School of Environmental Science and Engineering College of EngineeringSouthern University of Science and TechnologyShenzhen CityGuangdong ProvinceChina School of Resource Environment and Life ScienceNingxia Normal UniversityGuyuan CityGansu ProvinceChina State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen CityGuangdong ProvinceChina Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen CityGuangdong ProvinceChina

ABSTRACT Introduction:The use of reclaimed water(RW)for irrigation in agricultural practices raises concerns regarding the dissemination of antibiotic resistance genes(ARGs)from soils to edible *** effectiveness of na... 详细信息

关键词： Antibiotic Guangdong claimed

The Hot Spots in Cereal Rusts and Powdery Mildew Research

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Journal of Integrative Agriculture 2014年第2期13卷 229-232页

作者： CHEN Wan-quan DUAN xia-yu JIA Editorial Board Institute of Plant Protection Chinese Academy of Agricultural Sciences

Cereal crops, including wheat, barley, oats, rye, etc., are the major sources of calories and proteins for most of the people in the world as well as in China. Cereal rusts and powdery mildews are very important diseases occurred on the cereal crops, which caused yield losses at 5-10% in general and even more than 30% while severe epidemics occurred. In recent years, with the global climate change, change of cultivation system and evolution of the pathogens, the world is facing great challenges caused by cereal diseases.

关键词： The Hot Spots in Cereal Rusts and Powdery Mildew Research than

The impacts of infectious complications on outcomes in acute pancreatitis: a retrospective study

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Military Medical Research 2021年第1期8卷 37-47页

作者： Xun Jiang Ji-yu Shi xia-yu Wang Yong Hu yun-Feng Cui Tianjin Medical University Tianjin 300041China Department of Surgery Tianjin Nankai HospitalNankai Clinical School of Medicine122 Sanwei RoadNankai districtTianjin 300110China

Background: The occurrence of infectious complications characterizes the more severe forms of acute pancreatitis(AP) and is associated with high mortality. We investigated the effects of infection at different sites in patients with AP, including those with necrotizing pancreatitis(NP).Methods: We conducted a retrospective analysis of 285 patients who met the inclusion criteria for AP and were admitted to Tianjin Nankai Hospital between January 2016 and September 2019. According to the source of the culture positivity during hospitalization, patients were divided into four groups: sterile group(n=148), pancreatic infection group(n=65), extrapancreatic infection group(n=22) and combined infection group(n=50). The source of infection, microbiology, biochemical parameters and prognostic indicators were ***: In terms of baseline characteristics, the four groups were similar in age, sex, aetiology, previous pancreatitis and diabetes. Compared with the severity of the disease in the other groups, the APACHE II scores(9.91±4.65, 9.46±5.05, respectively) and organ failure rate(40.9% and 50%, respectively)were higher in the extrapancreatic infection group and the combined infection group(P<0.05). The frequency of surgical intervention and hospitalization time in patients with NP complicated with extrapancreatic infection was greatly increased(P<0.05). Regarding the primary outcome, patients in the combined infection group had longer hospital stays(68.28±51.80 vs. 55.58±36.24, P<0.05) and higher mortality(24.0% vs. 9.2%, P<0.05) than patients in the pancreatic infection group. In addition, patients in the extrapancreatic infection group also showed high intensive care utilization(59.1%) and mortality rates(18.2%). Among the 137 AP patients with infection complications, 89 patients exhibited multidrug-resistant(MDR) microorganisms, and the mortality rate of patients with MDR bacterial infection was higher than that of patients with non-MDR bacterial infection(24.7

关键词： Acute pancreatitis Infectious complications Extrapancreatic infection Mortality

LO And:an A-subtype contact binary with a very cool third component

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Research in Astronomy and Astrophysics 2021年第5期21卷 179-190页

作者： Hui-Ping Huang yun-xia yu Ting yu Ke Hu Fu-yuan xiang Key Laboratory of Stars and Interstellar Medium Xiangtan UniversityXiangtan 411105China Department of Physics Xiangtan UniversityXiangtan 411105China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

Despite the intensive investigations since the discovery of LO And approximately 60 yr ago,its evolutionary status and subtype are still a matter of *** simultaneously modeling the radialvelocity curves and new light curves with the Wilson-Devinney code,we present new geometric,photometric and absolute parameters for this *** simultaneous solution suggests that LO And is an A-subtype contact binary with a contact degree of 32.4%.The absolute parameters are modified to become M_(1)=1.409 M⊙,M_(2)=0.449 M⊙,R_(1)=1.36 R⊙and R_(2)=0.83 R⊙.From our observations and data from surveys,we determined 334 eclipse *** O−C diagram,constructed from the new eclipse timings and those reported in the literature,reveals a secular increase and a cyclic variation in its orbital *** former is caused by conservative mass transfer from the secondary component with less mass to the primary one with more *** latter may be explained by either the cyclic magnetic activity on the two components or the light-time effect due to a third *** the absolute physical parameters,we investigated its evolutionary status,and find that LO And is an unevolved contact binary undergoing thermal relaxation oscillation,which will eventually coalesce into a single star with rapid rotation.

关键词： stars:binaries:close stars:binaries:eclipsing stars:individual(LO And)

Modified Two-Degrees-of-Freedom Internal Model Control for Non-Square Systems with Multiple Time Delays

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Journal of Harbin Institute of Technology(New Series) 2014年第2期21卷 122-128页

作者： Jian-Chang Liu Nan Chen xia yu School of Information Science and Technology Northeastern University

A modified two-degrees-of-freedom( M-TDOF) internal model control( IMC) method is proposed for non-square systems with multiple time delays and right-half-plane( RHP) zeros. In this method,pseudo-inverse is introduced to design the internal model controller,and a desired closed-loop transfer function is designed to eliminate the unrealizable factors of the derived controller. In addition,set-point tracking and load-disturbance rejection of each process are separately controlled by two controllers. The simulation results show that in addition to high decoupling performance and robustness,the proposed control method also effectively improves loaddisturbance rejection and simultaneously optimizes the input tracking performance and disturbance rejection performance by selecting the parameters of controllers. Furthermore,the higher tolerance of model mismatch is achieved in this paper.

关键词： non-square system two degrees of freedom internal model control

A unique 3D microporous MOF constructed by cross-linking 1D coordination polymer chains for effectively selective separation of CO_(2)/CH4 and C_(2)H_(2)/CH_(4)

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Chinese Chemical Letters 2021年第3期32卷 1153-1156页

作者： yu-Pei xia Chen-Xue Wang Mei-Hui yu xian-He Bu School of Materials Science and Engineering National Institute for Advanced MaterialsNankai UniversityTianjin 300350China State Key Laboratory of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin 300071China

Selective separation of CO_(2)/CH_(4)and C2 H_(2)/CH_(4)are promising for their high-purity industrial demand and scientific research on account of the similar molecular radius and physical *** this work,a unique 3 D microporous MOF material[Cu(SiF6)(sdi)2]·solvents(1,sdi=1,1’-sulfonyldiimidazole)was successfully constructed by cross-linking 1 D coordination polymer *** dense functional active sites on the inner walls of the channel of la can provide strong binding affinities to CO_(2),C2 H_(2),and thus effectively improve the gas separation performance of CO_(2)/CH_(4)and C2 H_(2)/CH_(4).

关键词： Metal-organic framework Cross-linking Selective separation Dense functional active site

Synthesis and anti-HBV activity of S-substituted 7-mercapto-4-methylcoumarin analogs

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Chinese Chemical Letters 2008年第8期19卷 925-927页

作者： Ying Chen Jin Zhou Hai Wang Yi xia Zheng yu Yang Peng xia Department of Medicinal Chemistry School of Pharmacy Fudan University Shanghai 200032 China

Twelve S-substituted 7-mercapto-4-methylcoumarin analogs were synthesized and evaluated for the inhibition to HBV in HepG2 2.***.1.5 cell. Among them, ten compounds exhibited potent inhibition to HBsAg and/or HBeAg with the IC50 values of sub μmol/L level. The ICso of anti-HBsAg activities of 5c and 5j reached 0.01 μmol/L respectively which were 16 fold more potent than that of 3TC. Compounds 3, 5e, 5g, 5h and 5i showed admirable inhibitory activity to both HBsAg and HBeAg. The bioassay results indicated the S-substituted 7-mercapto-4-methylcoumarin analogs merit attention as novel anti-HBV agents.

关键词： Synthesis S-Substituted 7-mercapto-4-methylcoumarin Anti-HBV

Intermolecular cyclocondensation reaction of 3,4-dihydropyrimidine-2-thione under the Mitsunobu reaction conditions

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Chinese Chemical Letters 2011年第6期22卷 679-682页

作者： yu xia Da Zhang Zhang Zheng Jun Quan Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education Gansu Key Laboratory of Polymer Materials College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 China

A self-intermolecular cyclocondensation reaction of 3,4-dihydropyrimidine-2-thione（DHPM） to give a novel tricyclic structure containing DHPM core in the presence of diethyl azodicarboxylate（DEAD） and triphenylphos... 详细信息

关键词： Mitsunobu reaction Cyclocondensation 3 4-Dihydropyrimidine-2-thiones

Essential Norms of Weighted Composition Operators from Weighted Bergman Space to Mixed-norm Space on the Unit Ball

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Acta Mathematica Sinica,English Series 2013年第3期29卷 547-556页

作者： Ze Hua ZHOU yu xia LIANG Hong Gang ZENG Department of Mathematics Tianjin University

In this paper, we characterize the boundedness and compactness of the weighted composi- tion operators from the weighted Bergman space to the standard mixed-norm space or the mixed-norm space with normal weight on the... 详细信息

关键词： Weighted composition operator weighted Bergman space mixed-norm space essentialnorm compact

Idealization Second Quantization of Composite Particles

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Communications in Theoretical Physics 2001年第11期36卷 525-530页

作者： ZHOU Duan-Lu yu Si-xia SUN Chang-Pu Institute of Theoretical Physics Academia SinicaBeijing 100080China Institute of Theoretical PhysicsAcademia SinicaBeijing 100080China Institute of Theoretical PhysicsAcademia SinicaBeijing 100080China

A practical method is developed to deal with the second quantization of the many-body system containing the composite *** our treatment,the modes associated with composite particles are regarded approximately as independent ones compared with those of unbound *** field operators of the composite particles thus arise naturally in the second quantization *** be emphasized,the second quantization Hamiltonian has the regular structures which correspond clearly to different physical processes.

关键词： second quantization,composite particles