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Occurrence and possible sources of antibiotic resistance genes in seawater of the South China Sea

Frontiers of Environmental Science & Engineering 2024年第9期18卷 27-38页

作者： Jian Lu Jun Wu cui Zhang Jianhua Wang xia He CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone Research(YIC)Chinese Academy of Sciences(CAS)Shandong Key Laboratory of Coastal Environmental ProcessesYICCASYantai 264003China Yantai Research Institute Harbin Engineering UniversityYantai 264006China College of Environmental Science and Engineering Guilin University of TechnologyGuilin 541006China

Antibiotic resistance genes(ARGs)might have great effect on ecological security and human *** are important reservoirs that receive tremendous amounts of pollutants ***,information on the proliferation of ARGs in seawater is still *** study performed field sampling to investigate the occurrence and distribution of ARGs in seawater of the South China Sea,which is the deepest and largest sea in *** results showed that the total absolute abundances of ARGs in seawater samples ranged from 2.1×10^(3)to 2.3×10^(4)copies/mL,with an of 5.0×10^(3)copies/mL and a range of 2.2×10^(3)–1.8×10^(4)copies/mL for those with mobile genetic elements(MGEs).Genes resistant to multidrug,aminoglycoside,tetracycline,and fluoroquinolone antibiotics accounted for 77.3%–88.6%of total ARGs in *** and Cyanobacteria represented 32.1%–56.2%and 30.4%–49.5%of microbial community,***_MIT9313 and Clade_la were the prevalent genera in seawater of the South China *** co-occurrence relationship existed among ARGs,MGEs,and *** activities had critical influence on ARGs and *** wastewater,wastewater treatment plant effluent,sewage,aquaculture tailwater,and runoff were determined as the important sources of ARGs in seawater of the South China Sea based on positive matrix factorization analysis.

关键词： The South China Sea Antibiotic resistance genes Mobile genetic element Source apportionment

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Microstructures and strengthening mechanisms of Mg-8.2Gd-4.6Y-1.5Zn-0.4Zr alloy containing LPSO,β’ and γ type phases

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Journal of Rare Earths 2020年第10期38卷 1119-1125,I0004页

作者： xiangsheng xia Kui Zhang Minglong ma Ting Lie State Key Laboratory of Non-Ferrous Metals and Processes GRINM Co.LtdBeijing 700088China GR1maT Engineering Institute Co. Ltd.Beijing 101400China General Research Institute for Non-Ferrous Metals Beijing 100088China Southwest Technology and Engineering Research Institute Chongqing 400039China National Center of Analysis and Testing for Nonferrous Metals and Electronic materials China United Test&Certification Co.Ltd.GRINM Group Co.Ltd.Beijing 100088China

The microstructures and strengthening mechanisms of the Mg-8.2 Gd-4.6 Y-1.5 Zn-0.4 Zr(wt%) alloy with long-period stacking ordered(LPSO),β’ and γ type phases were systematically *** results show that the LPSO with lamellar and block structures forms near the grain *** grains are clearly refined,and the 18 R LPSO phase is oriented along the extrusion direction after *** particles also precipitate from the Mg matrix *** extruded alloy exhibits a remarkable agehardening response,and mechanical properties,with a tensile strength(TS) of 449 MPa,yield strength(YS) of 362 MPa,and elongation of 7.9% obtained in the peak-aged *** strengthening mechanisms of the alloy in different states are *** boundary and precipitation strengthening are the main strengthening mechanisms for the peak-aged alloy.

关键词： Mg-Cd-Y-Zn-Zr alloy LPSO phase Microstructure Mechanical properties Strengthening mechanism Rare earths

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Computation of rolling resistance caused by rubber hysteresis of truck radial tire

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第5期8卷 778-785页

作者： ma Gai-ling XU Hong cui Wen-yong College of Mechanical and Electrical Engineering Beijing University of Chemical Technology Beijing 100029 China

Applying the results of stress and strain calculated by 3D finite element model of truck radial tire 11.00R20, a maTLAB program used to compute rolling resistance of the tire caused by hysteresis rolling resistance (HRR) is worked out. The HRR distribution on different part of tire section, and the effects of speed, load, internal pressure and the width of the rim on HRR are analyzed. The analysis results showed that energy loss produced by tread rubber contributes the most part to HRR of the whole tire, and that to decrease the HRR, the hysteresis factor of the tread rubber should be reduced, and the distribution of the stress and strain on the section be optimized.

关键词： Truck radial tire Hysteresis rolling resistance (HRR) Finite element analysis (FEA) Hysteresis factor Tire structuredesign

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DBS imaging based on Keystone transform

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Journal of Systems Engineering and Electronics 2012年第3期23卷 342-348页

作者： Jing Tian Wei cui Lin ma Siliang Wu Radar Research Institute Beijing Institute of TechnologyBeijing 100081E R.China

To correct the range walk through resolution cell in Doppler beam sharpening （DBS） imaging, a new DBS imaging algorithm based on Keystone transform is proposed. Without the exact values of the movement parameters and the look angle of the radar platform in the multi-targets environment, a linear trans- form on the received data is employed to correct different range walk values accurately under the condition of Doppler frequency ambiguity in this algorithm. This method can realize the cohe- rent integration in azimuth dimension and improve the azimuth resolution. In order to reduce the computational burden, a fast implementation of Keystone transform is used. Theoretical anal- ysis and simulation results demonstrate the effectiveness of the new algorithm. And through comparing the computational load of the fast implementation with several other algorithms, the real-time processing ability of the proposed algorithm is superior to that of other algorithms.

关键词： Doppler beam sharpening (DBS) Keystone transform range walk coherent integration.

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Designing All‑Solid‑State Batteries by Theoretical Computation:A Review

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Electrochemical Energy Reviews 2023年第1期6卷 790-829页

作者： Shu Zhang Jun ma Shanmu Dong Guanglei cui Qingdao Industrial Energy Storage Research Institute Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101ShandongChina

All-solid-state batteries(ASSBs)with solid-state electrolytes and lithium-metal anodes have been regarded as a promis-ing battery technology to alleviate range anxiety and address safety issues due to their high energy density and high *** the fundamental physical and chemical science of ASSBs is of great importance to battery *** confirm and supplement experimental study,theoretical computation provides a powerful approach to probe the thermody-namic and kinetic behavior of battery materials and their interfaces,resulting in the design of better *** this review,we assess recent progress in the theoretical computations of solid electrolytes and the interfaces between the electrodes and electrolytes of *** review the role of theoretical computation in studying the following:ion transport mechanisms,grain boundaries,phase stability,chemical and electrochemical stability,mechanical properties,design strategies and high-throughput screening of inorganic solid electrolytes,mechanical stability,space-charge layers,interface buffer layers and dendrite growth at electrode/electrolyte ***,we provide perspectives on the shortcomings,challenges and opportunities of theoretical computation in regard to ASSBs.

关键词： Theoretical computation All-solid-state batteries Solid electrolyte Electrode-electrolyte interface

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Numerical studies on the boundary entanglement in an optomechanical phonon laser system

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Communications in Theoretical Physics 2020年第11期72卷 37-42页

作者： Qing-xia Meng Zhi-Jiao Deng Shi-Wei cui Department of Physics College of Liberal Arts and SciencesNational University of Defense TechnologyChangsha 410073China Northwest Institute of Nuclear Technology Xi’an 710024ShaanxiChina Interdisciplinary Center for Quantum Information National University of Defense TechnologyChangsha 410073China

In our previous work(Meng et al 2020 ***.A 101023838),we discover the phenomenon that the quantum entanglement on the driving threshold line remains a constant in a three-mode optomechanical phonon laser *** this paper,to find the conditions under which the constant boundary entanglement shows up,we explicitly study how this boundary entanglement depends on various parameters through numerical *** results show that the necessary and sufficient condition is a resonant frequency match between the optical frequency difference and the mechanical vibrational frequency,and this constant value is proportional to the multiplication of the square of the optomechanical coupling strength and the resonant driving threshold power.

关键词： boundary entanglement optomechanics phonon laser

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Lithospheric structure and evolution of the North China Craton:An integrated study of geophysical and xenolith data

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Science China Earth Sciences 2021年第2期64卷 205-219页

作者： Jianping ZHENG Bing xia Hongkun DAI Qiang ma School of Earth Sciences State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

Determination of the physical and chemical structures of the inaccessible continental lithosphere by comprehensive geophysical and geochemical studies can provide valuable information on its formation and *** studies from various disciplines have revealed complex lithospheric modification of the North China Craton(NCC),but less attention has been paid to an integrated study from different *** we provide an integrated constraint on the lithospheric mantle structure of the NCC by comprehensive semiology,gravity and thermal studies with xenolith data involving depth(levels in the lithosphere),property(chemical and physical),and timing(formation and reworking ages).Our results suggest that the NCC has a relatively heterogeneous lithospheric *** margins and internal weak zones,especially in the eastern NCC,are generally underlain by the fertile,weakly metasomatized mantle with generally young formation *** contrast,its core tends to preserve the refractory,strongly metasomatized mantle with ages roughly coupled to the overlying Archean *** a lithospheric structure shows the preferential modification of the lithospheric mantle in the eastern NCC and in the peripheral regions of the western *** interior of the craton,especially most of the western NCC,remains stable and has been weakly modified.

关键词： Lithospheric thermal and density structure Peridotite xenolith Heterogeneous mantle replacement North China Craton

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Air Plasma-Activated Crosslinking of Low-Density Polyethylene During Melt Mixing

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Transactions of Tianjin University 2020年第1期26卷 33-39页

作者： Yangfeng cui Zhe ma Guiqiu ma Jing Sheng School of materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University

In this work,air plasma surface treatment followed by oxidation in an atmospheric environment was used to generate activated low-density polyethylene(LDPE)with oxygen-containing functional groups and peroxide *** resulting samples were then studied by using attenuated total internal reflectance-Fourier-transform infrared spectroscopy,X-ray photoelectron spectroscopy,and the 2,2-diphenyl-1-picrylhydrazyl *** radicals are generally considered active substances which can initiate the crosslinking *** mixing of the surface-treated LDPE allowed activated polymer chains with peroxide radicals to initiate the crosslinking reaction,and the maximum gel fraction obtained was 4.1%.The rheological behaviors,including viscosity,storage and loss moduli,loss tangent,and Cole-Cole plots,of the slightly crosslinked LDPE were studied,and the results of tensile experiments revealed that the formation of slightly crosslinked structures can improve yield and fracture stresses without sacrificing the breakage strain.

关键词： Air plasma Slight crosslinking Rheological behaviors Mechanical properties

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Electronic and Optical Properties of B- and/or In-Doped GaAs Calculated Using many-body Green＇s Function Theory

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Chemical Research in Chinese Universities 2016年第6期32卷 996-1004页

作者： LIANG Dongmei LENG xia ma Yuchen School of Chemistry and Chemical Engineering Shandong University Jinan 250100 P. R. China College of Physics and Electronic Engineering Kaili University Kaili 556011 P. R. China

Using ab initio many-body Green＇s Function theory, the electronic and optical properties of pure BAs,InAs as well as B- and/or In-doped GaAs supercells were studied. The results show that the calculated quasiparticleband gaps of BAs and InAs are in agreement with the experiments. The electronic and optical absorption properties of B-and/or In-doped GaAs are very sensitive to the lattice constant models used in the calculations, which can explainthe controversies in previous theoretical and experimental works. Under the lattice constant condition based on theVegard＇s Law, the reduced band gap and the redshift of the first excited state E0 can be observed for InyGa1-y As withIn concentrations（atomic fractions） ranging from 0 to 15.625%, while the band gap increase and the blueshift of stateE0 can be realized for BxGal-xAs. However, an opposite trend can be found when the lattice constant is fixed to theexperimental value, i.e., In doping leads to a band gap increase and a blueshift of the E0 state, while B doping resultsin a band gap decrease and a redshift of the E0 state. For BxGal-x-y InyAs, the values of the band gap variation and theshift of state E0 are well located between the B and In mono-doping cases. It is worth mentioning that B doping doesnot introduce new impurity states in the band gap of GaAs or InyGa1-2As.

关键词： GaAs Doping Electronic structure Optical property First principles calculation

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Survival Probability of Population-size-dependent Branching Processes in Random Environments

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Acta mathematicae Applicatae Sinica 2016年第2期32卷 477-484页

作者： Shi-xia ma xiao-yu XING School of Sciences Hebei University of Technology

The class of population-size-dependent branching processes in independent identically distributed random environments is investigated. Under the critical case and appropriate moment assumption, we establish an asympto... 详细信息

关键词： branching processes population-size-dependent processes random environments survival proba-bility

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