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Characteristics of sewer biofilms in aerobic rural small diameter gravity sewers

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Journal of Environmental Sciences 2020年第4期32卷 1-9页

作者： wenkai li Tianlong Zheng Yingqun Ma Junxin liu State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Advanced Environmental Biotechnology Centre Nanyang Environment&Water Research InstituteNanyang Technological UniversitySingapore637141Singapore

Small diameter gravity sewers(SDGS)are extensively used to collect rural sewage as they are low in cost and quick to ***,the characteristics of biofilms in rural SDGS are still not *** this study,biofilms characteristics of aerobic rural SDGS were investigated using simulations in a lab under different flow conditions and *** indic ated that the average thickness of aerobic rural SDGS biofilms was in the range of 350-650μm,decreasing at locations with variable flow and high *** was the most abundant substance in extracellular polymeric substance of SDGS *** most abundant bacteria,Proteobacteria,Actinobacteria,and Bacteroidetes,and functional bacteria showed different distributions when analyzed through Illumina HiSeq sequencing of 16 S *** relative abundances of denitrifying bacteria,nitrite-oxidizing bacteria,and sulfate-reducing bacteria(SRB)were lower during variable flow than during stable *** slopes(15‰)decreased SRB presence,which could be used to mitigate H2 S accumulation in aerobic ***,this study describes the characteristics of aerobic rural SDGS biofilms and provides valuable suggestions for the optimal design of SDGS based on these characteristics.

关键词： Bacterial community Biofilms Functional bacteria Rural area Small diameter gravity sewers

Evaluation and adjustment of the radiometric degradation of HY-1B satellite COCTS via a stable marine site

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Geo-Spatial Information Science 2023年第3期26卷 321-332页

作者： wenkai li Guangping Xia Qingjun Song Ruqing Tong liqiao Tian State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina Hubei LuoJia Laboratory WuhanChina National Satellite Ocean Application Service Ministry of Natural Resource of the People’s Republic of ChinaBeijingChina

The Chinese Ocean Color and Temperature Scanner(COCTS)on-board the Chinese second ocean color satellite,HY-1B,obtained approximately 6 years of data between 2007 and 2013 in China coastal seas and the adjacent ***,its radiometric performance has hardly been analyzed,which confuses its applicability in ocean remote *** study tracked the long-term radiometric responsivity trend of HY-1B COCTS based on a stable marine ***,we identified a temporally stable maritime site of 12°~15°N and 116°~119°E according to the water and atmospheric optical properties using Aqua MODIS ***,the time-series of top-of-atmosphere(TOA)reflectance was obtained for each band of HY-1B COCTS and Aqua MODIS over this site according to the criteria of sun-target-view ***,exponential or linear degradation models were built and used to adjust the radiometric levels of HY-1B *** indicate that the radiometric performance exhibited continuous degradation for all bands at varying levels between 0.4%and 8.1%yr^(−1).The worst degradation occurred at 412 nm,with an annual average rate of 8.1%.The degradation at 443 nm reached 5.5%yr^(−1)following 412 *** radiometric performance at 490 nm,520 nm,and 565 nm was relatively stable with a drift of~3%yr^(−1).The 670 nm,750 nm,and 865 nm bands remain most stable with the degradation of~1%yr^(−1).Taking Terra MODIS as a reference,the temporal consistency of HY-1B COCTS was significantly improved for each band after radiometric ***-free imageries between 2007 and 2013 showed relatively high spatial *** bias of TOA reflectance was~5%in visible bands and~10%in near-infrared bands after degradation *** improvements confirm the application potentials of HY-1B COCTS in ocean remote sensing.

关键词： HY-1B COCTS radiometric degradation stable marine site

Kinetics measurement of ethylene-carbonate synthesis via a fast transesterification by microreactors

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Chinese Journal of Chemical Engineering 2023年第1期53卷 243-250页

作者： Tengjie Wang wenkai li Xuehui Ge Ting Qiu Xiaoda Wang Engineering Research Center of Reactive Distillation Fujian Province Higher Education InstitutesCollege of Chemical EngineeringFuzhou UniversityFuzhou 350108China Qingyuan Innovation LaboratoryQuanzhou 362801China

High-purity ethylene carbonate(EC)is widely used as battery electrolyte,polycarbonate monomer,organic intermediate,and so *** economical and sustainable route to synthesize high-purity ethylene carbonate(EC)via the transesterification of dimethyl carbonate(DMC)with ethylene glycol(EG)is provided in this ***,this reaction is so fast that the reaction kinetics,which is essential for the industrial design,is hard to get by the traditional measuring *** this work,an easy-to-assemble microreactor was used to precisely determine the reaction kinetics for the fast transesterification of DMC with EG using sodium methoxide as *** effects of flow rate,microreactor diameter,catalyst concentration,reaction temperature,and reactant molar ratio were *** activity-based pseudohomogeneous kinetic model,which considered the non-ideal properties of reaction system,was established to describe the transesterification of DMC with *** kinetics data were collected in the first 5 *** these data,the parameters of the kinetic model were correlated with the maximum average error of 11.19%.Using this kinetic model,the kinetic data at different catalyst concentrations and reactant molar ratios were predicted with the maximum average error of 13.68%,suggesting its satisfactory prediction performance.

关键词： Microreactor Kinetics Ethylene carbonate synthesis Transesterification Sodium methoxide

Reaction kinetics for the heterogeneously resin-catalyzed and homogeneously self-catalyzed esterification of thioglycolic acid with 2-ethyl-1-hexanol

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Chinese Journal of Chemical Engineering 2021年第8期34卷 111-119页

作者： Xiaoda Wang wenkai li Shiwei Wang Qinglian Wang ling li Hongxing Wang Ting Qiu Engineering Research Center of Reactive Distillation Fujian Province UniversitySchool of Chemical EngineeringFuzhou UniversityFuzhou 350108China College of Chemical Engineering and Materials Science Tianjin University of Science&TechnologyTianjin 300457China

Producing 2-ethyl-1-hexyl thioglycolate(ETE)via esterification reaction with thioglycolic acid(TGA)aqueous solution as raw material by reactive-separation coupling technology is a promising process intensification *** choose suitable reactive-separation coupling strategy,the kinetic studies of the esterification of TGA with 2-ethyl-1-hexanol(EHL)were carried out in a batch *** commercial ion exchange resin was employed as an eco-friendly *** effects of temperature,catalyst concentration and molar ratio were *** was interesting to observe that the equilibrium conversion of TGA increased with the increase of catalyst mass fraction due to the adsorption of product water onto resin *** activity-based pseudo-homogeneous(PH),Eley-Rideal(ER)and Langmuir-Hinshelwood-Ho ugen-Watson(LHHW)models were used to fit the kinetics data of the resin-catalyzed *** models of ER and LHHW performed better than the PH *** kinetics of the TGA-self-catalyzed reaction was also *** activity-based homogeneous kinetics model could well describe this self-catalyzed *** results would be meaningful to the selection and design of an appropriate reactionseparation strategy for the production of ETE,to realize the process intensification.

关键词： Kinetics Autocatalysis Kinetic modeling 2-Ethyl-1-hexyl thioglycolate Esterification Ion exchange resin

Interfacial Properties of a-Si:H/a-SiN_(x):H Multilayers Studied by electroabsorption Spectroscopy

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Chinese Physics Letters 1991年第7期8卷 364-367页

作者： liU Xiangna ZHAO zhouying WANG Yong li wenkai Department of Physics Nanjing UniversityNanjing 210008

By using electroabsorption method,we find that the built-in field(~10^(5) V·cm^(-1))in the a-Si sublayers of a-Si:H/a-SiN_(x):H multilayers points towards the sample *** ascribe the internal field to the asymmetric distribution of defect states which exist primarily in the silicon side of the silicon-on-nitride interfaces,owing to the large repellent lattice stress *** also find that the built-in potential depends strongly on x,with a maximum value near x=*** intend to explain it as a result of structural softening as more N atoms are introduced into Si networks in the range of x>1.0.

关键词： primarily explain asymmetric

NetEPD: A Network-Based Essential Protein Discovery Platform

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Tsinghua Science and Technology 2020年第4期25卷 542-552页

作者： Jiashuai Zhang wenkai li Min Zeng Xiangmao Meng Lukasz Kurgan Fang-Xiang Wu Min li the School of Computer Science and Engineering Central South UniversityChangsha 410083China the Department of Computer Science Virginia Common-wealth UniversityRichmondVA 23284-2512USA the Division of Biomedical Engineering and Department of Mechanical Engineering University of SaskatchewanSaskatoonS7N 5A9Canada

Proteins drive virtually all cellular-level *** proteins that are critical to cell proliferation and survival are defined as *** essential proteins are implicated in key metabolic and regulatory networks,and are important in the context of rational drug design *** computational identification of the essential proteins benefits from the proliferation of publicly available protein interaction *** have developed several algorithms that use these interaction datasets to predict essential ***,a comprehensive web platform that facilitates the analysis and prediction of essential proteins is *** this study,we design,implement,and release Net EPD:a network-based essential protein discovery *** resource integrates data on Protein–Protein Interaction(PPI)networks,gene expression,subcellular localization,and a native set of essential *** also computes a variety of node centrality measures,evaluates the predictions of essential proteins,and visualizes PPI *** comprehensive platform functions by implementing four activities,which include the collection of datasets,computation of centrality measures,evaluation,and *** results produced by Net EPD are visualized on its website,and sent to a user-provided email,and they are available to download in a parsable *** platform is freely available at http://***/netepd.

关键词： essential proteins centrality data integration evaluation visualization

Tailoring Texture to Highly Strengthen AZ31 Alloy Plate in the Thickness Direction via Pre-tension and Rolling-Annealing

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 266-280页

作者： Tianjiao li Jiang Zheng lihong Xia Haoge Shou Yongfa Zhang Rong Shi liuyong He wenkai li International Joint Laboratory for light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Shenyang National Laboratory for Materials Science Chongqing UniversityChongqing400044China College of Mechanical Engineering Chongqing Technology and Business UniversityChongqing400067China Zhejiang Provincial Engineering Center of Integrated Manufacturing Technology and Intelligent Equipment Zhejiang University City CollegeHangzhou310015China

Conventional wrought Mg alloys,such as AZ31 and ZK60 rolled plates,usually exhibit significantly low tensile yield strength in the thickness *** can be attributed to the high activity of{10-12}tension twinning due to the strong basal texture(//ND,normal direction).In this work,the tensile yield strength in the ND of the as-rolled(AR)AZ31 plate increased from 50 to 150 MPa(increased by 200%)via simple processing,i.e.,pre-tension and rolling-annealing(PTRA)*** strong basal texture(//ND)of the AR plate was changed into a weakened fiber texture(⊥ND).The evolution of microstructures during PTRA treatment and the activated deformation modes during uniaxial tension were studied quantitatively and statistically by the means of intergranular misorientation(IM)and in-grain misorientation axes(IGMA)*** results indicate that various twin variants,as well as{10-12}-{10-12}secondary twins,were activated during pre-tension and rolling,and most residual matrix was consumed by twins after *** dominated deformation modes in tension changed from{10-12}tension twinning(the AR sample)to prismatic slip(the PTRA sample)in the early tensile *** underlying formation mechanism of the fiber texture and corresponding strengthening mechanism were discussed.

关键词： Pre-tension Annealing Tailoring texture Texture strengthening Deformation modes

Shortening the manufacturing process of degradable magnesium alloy minitube for vascular stents by introducing cyclic extrusion compression

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Journal of Magnesium and Alloys 2024年第8期12卷 3204-3215页

作者： Kun Sheng wenkai li Peihua Du Di Mei Shijie Zhu liguo Wang Shaokang Guan School of Materials Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Advanced Materials Processing&Mold Ministry of Education Zhengzhou 450002China

Due to its excellent biocompatibility and biodegradability,Mg and its alloys are considered to be promising materials for manufacturing of vascular ***,the manufacture of high-precision and high-performance Mg alloys minitubes is still a worldwide problem with a long manufacturing processing caused by the poor workability of Mg *** solve this problem,the cyclic extrusion compression(CEC)was used to pretreat the billet by improving the workability of Mg alloys,finally shortening the manufacturing *** CEC treatment,the size of grains and second phase particles of Mg alloys were dramatically refined to 3.2μm and 0.3μm,*** after three passes of cold drawing,the wall thickness of minitube was reduced from 0.200 mm to 0.135 mm and a length was more than 1000 *** error of wall thickness was measured to be less than 0.01 mm,implying a high dimensional *** yield strength(YS),ultimate tensile strength(UTS)and elongation of finished minitube were 220±10 MPa,290±10 MPa and 22.0±0.5%,*** addition,annealing can improve mechanical property and corrosion resistance of minitubes by improving the homogeneity of the microstructure and enhancing the density of basal texture.

关键词： CEC ZE21B Mg alloy Minitube Shortened procedure Cold drawing Annealing

Intense ultraviolet-visible-infrared full-spectrum laser

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light(Science & Applications) 2023年第9期12卷 1902-1910页

作者： lihong Hong liqiang liu Yuanyuan liu Junyu Qian Renyu Feng wenkai li Yanyan li Yujie Peng Yuxin Leng Ruxin li Zhi-Yuan li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanic Chinese Academy of SciencesShanghai 201800China

A high-brightness ultrabroadband supercontinuum white laser is desirable for various fields of modern ***,we present an intense ultraviolet-visible-infrared full-spectrum femtosecond laser source(with 300–5000 nm 25 dB bandwidth)with 0.54 mJ per *** laser is obtained by sending a 3.9μm,3.3 mJ mid-infrared pump pulse into a cascaded architecture of gas-filled hollow-core fiber,a bare lithium niobate crystal plate,and a specially designed chirped periodically poled lithium niobate crystal,under the synergic action of second and third order nonlinearities such as high harmonic generation and self-phase *** full-spectrum femtosecond laser source can provide a revolutionary tool for optical spectroscopy and find potential applications in physics,chemistry,biology,material science,industrial processing,and environment monitoring.

关键词： pump spectrum ultraviolet