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Selective targeted adsorption and inactivation of antibiotic-resistant bacteria by Cr-loaded mixed metal oxides

Frontiers of Environmental Science & Engineering 2022年第6期16卷 1-12页

作者： Yanlin Li Bo Wang lei Zhu Yixing yuan Lujun Chen Jun Ma State Key Laboratory of Urban Water Resources and Environment(SKLUWRE) Harbin Institute of TechnologyHarbin 150090China Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology School of Environmental Science and Safety EngineeringTianjin University of TechnologyTianjin 300384China Jiangsu Yihuan Group Co. Ltd.Yixing 214206China School of Environment Tsinghua UniversityBeijing 100084China

Herein we provide a novel high-efficiency nanocomposite for bacterial capture based on mixed metal oxides(MMOs)with deleterious chromium *** both the layer structure of layered double hydroxides(LDHs)and the magnetic properties of Fe,MMOs enrich the location of ionic forms on the surface,providing a good carrier for adsorption of the heavy metal Cr(VI).The capacity for adsorption of Cr(VI)by MMOs can be as high as 98.80 mg/*** prepared Cr(VI)-MMOs achieved extremely expeditious location of gram-negative antibiotic-resistant ***-1 by identifying lipid ***-MMOs with a Cr loading of 19.70 mg/g had the best bactericidal effect,and the concentration of ***-1 was decreased from~10^(8) to~10^(3) CFU/mL after 30 min of *** binding of nitrogen and phosphorus hydrophilic groups to chromate generated realistic models for density functional theory(DFT)*** specific selectivity of MMOs toward bacterial cells was improved by taking Cr(VI)as a transferable medium,thereby enhancing the antibacterial activity of *** the combined action of chemical and physical reactions,Cr(VI)-MMOs achieved high capacity for inactivation of ***,the metallic elements ratio in Cr-MMOs remained stable in their initial valence states after *** guaranteed high removal efficiency for both heavy metals and bacteria,allowing recycling of the adsorbent in practical applications.

关键词： Heavy metal adsorption Magnetic hydrotalcite ARBs removal Cr(VI)-MMOs combined antibacterial activity

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Investigation on effect of drag models on flow behavior of power-law fluid–solid two-phase flow in fluidized bed

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Particuology 2022年第11期70卷 43-54页

作者： Zihan yuan Shuyan Wang Baoli Shao lei Xie Yujia Chen Yimei Ma Key Laboratory of Enhanced Oil Recovery of Ministry of Education School of Petroleum EngineeringNortheast Petroleum UniversityDaqing 163318China

In this study,a Eulerian-Eulerian two-fluid model combined with the kinetic theory of granular flow is adopted to simulate power-law fluid–solid two-phase flow in the fluidized *** new power-law liquid–solid drag models are proposed based on the rheological equation of power-law fluid and pressure *** called model A is a modified drag model considering tortuosity of flow channel and ratio of the throat to pore,and the other called model B is a blending drag model combining drag coefficients of high and low particle *** are compared with experimental data measured by Lali et al.,where the computed porosities from model B are closer to the measured data than other ***,the predicted pressure drop rises as liquid velocity increases,while it decreases with the increase of particle *** results indicate that the increases of consistency coefficient and flow behavior index lead to the decrease of drag coefficient,and particle concentration,granular temperature,granular pressure,and granular viscosity go down accordingly.

关键词： Power-law liquid-solid drag models Power-law fluid Liquid-solid two-phase flow Eulerian-Eulerian two-fluid model

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An unsupervised classification method of flight states for hypersonic targets based on hyperspectral features

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Chinese Journal of Aeronautics 2023年第5期36卷 434-446页

作者： Shurong yuan lei SHI Yutong ZHAI Bo YAO Fangyan LI Yuefan DU Key Laboratory of Equipment Efficiency in Extreme Environment Ministry of EducationXiDian UniversityXi’an 710071China School of Aerospace Science and Technology XiDian UniversityXi’an 710071China

In response to the challenges of aerospace defense caused by the rapid development of hypersonic targets in recent years,the research on the unsupervised classification of flight states for hypersonic targets is carried out in this paper,which is based on the Hyperspectral Features(HFs)of hypersonic targets covered with plasma sheath during high-speed ***,a new concept of the super node is defined to improve classification accuracy by alleviating the intraclass variability of ***,the frequency domain information of the curve of HFs is utilized to reduce the feature redundancy according to the prior theoretical knowledge that the fluctuation characteristics of HFs of the same flight states are ***,an unsupervised classification method based on the Density Peak Clustering(DPC)for HFs is designed to class flight states after eliminating the impact of intraclass variability and feature dimension *** proposal is compared with the traditional classification algorithms on simulated hyperspectral data sets of typical flight states of the hypersonic vehicle and an actual-observation hyperspectral data *** results indicate that the performance of our proposal has competitive advantages in terms of Overall Accuracy(OA),Average Accuracy(AA)and Kappa coefficient.

关键词： Classification Clustering algorithms Hypersonic vehicles Hyperspectral Unsupervised

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Block Copolymer Networks Composed of Poly(ε-caprolactone) and Polyethylene with Triple Shape Memory Properties

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Chinese Journal of Polymer Science 2022年第2期40卷 185-196页

作者： Honggang Mei Bingjie Zhao yuan Gao lei Li Liyue Liu Sixun Zheng College of Chemistry and Chemical Engineering and the State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

In this contribution, we reported a novel synthesis of block copolymer networks composed of poly(ε-caprolactone)(PCL) and polyethylene(PE) via the co-hydrolysis and condensation of α,ω-ditriethoxylsilane-terminated PCL and PE telechelics. First, α,ω-dihydroxylterminated PCL and PE telechelics were synthesized via the ring-opening polymerization of ε-caprolactone and the ring-opening metathesis polymerization of cyclooctene followed by hydrogenation of polycyclooctene. Both α,ω-ditriethoxylsilane-terminated PCL and PE telechelics were obtained via in situ reaction of α,ω-dihydroxyl-terminated PCL and PE telechelics with 3-isocyanatopropyltriethoxysilane. The formation of networks was evidenced by the solubility and rheological tests. It was found that the block copolymer networks were microphase-separated. The PCL and PE blocks still preserved the crystallinity. Owing to the formation of crosslinked networks, the materials displayed shape memory properties. More importantly, the combination of PCL with PE resulted that the block copolymer networks had the triple shape memory properties, which can be triggered with the melting and crystallization of PCL and PE blocks. The results reported in this work demonstrated that triple shape memory polymers could be prepared via the formation of block copolymer networks.

关键词： Poly(ε-caprolactone) Polyethylene Block copolymer networks Triple shape memory properties

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Dynamic Ring-chain Equilibrium of Nucleophilic Thiol-yne "Click" Polyaddition for Recyclable Poly(dithioacetal)s

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Chinese Journal of Polymer Science 2021年第9期39卷 1146-1154页

作者： Jin-Xia lei Qi-yuan Wang Fu-Sheng Du Zi-Chen Li Beijing National Laboratory for Molecular Sciences(BNLMS) Key Laboratory of Polym.Chem.&Physics of Ministry of EducationDepartment of Polymer Science&EngineeringCollege of Chemistry and Molecular EngineeringCenter for Soft Matter Science and EngineeringPeking UniversityBeijing 100871China

We report a dynamic polymerization system based on the reversible nucleophilic Michael polyaddition of activated alkynes and *** poly(dithioacetal)s(P1-P4)were prepared via the base-catalyzed thiol-yne"click"polyaddition of two dithiols(1,4-butanedithiol(4S)and 1,5-pentanedithiol(5S))and two alkynones(3-butyn-2-one(Y1)and 1-phenyl-2-propyn-1-one(Y2))at high *** systematically investigated the base-catalyzed polymerization of 4S and Y1(for polymer PI)under different conditions,and found that this polymerization was a highly concentration-dependent dynamic system:polymer PI was formed at high concentration,while seven-membered dithioacetal,1-(1,3-dithiepan-2-yl)propan-2-one(C1),was obtained at low *** polymerization of 4S and Y2(for polymer P4)displayed similar polymerization behavior,generating 2-(1,3-dithiepan-2-yl)-1-phenylethanone(C4)at low *** the contrary,polymer P2(from Y1 and 5S)was exclusively obtained with no formation of eight-membered *** polymerizations of Y1 with 1,2-ethanedithiol(2S)and 1,3-dimercaptopropane(3S)only afforded corresponding five-and six-membered dithioacetals,1-(1,3-dithiolan-2-yl)propan-2-one(C2)and 1-(1,3-dithian-2-yl)propan-2-one(C3).This dynamic behavior of PI and P4 was attributed to the concentration-dependent retro-Michael addition reaction between a thiol and a β-sulfido-α,β-unsaturated carbonyl compound catalyzed by ***,polymers P1 and P4 could be depolymerized into Cl and C4 in yields of 58% and 95%,*** ring-opening polymerization of Cl at high concentration could successfully regenerate polymer ***,a new type of closed-loop recyclable poly(dithioacetal)s was developed.

关键词： Poly(dithioacetal)s Nucleophilic thiol-yne"click"polyaddition Chemical recycling Ring-chain equilibrium

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Significant annealing-induced hardening effect in nanolaminate d-nanotwinne d(CrCoNi)_(97.4)Al_(0.8)Ti_(1.8)me dium-entropy alloy by severe cold rolling

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Journal of Materials Science & Technology 2024年第3期170卷 156-166页

作者： Shuqing yuan Hui Fu lei Qian Chi Fai Cheung Xu-Sheng Yang State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518060China

Due to the easy coarsening caused by poor thermal stability,the verified annealing-induced hardening in nanograined metals can only maintain at a relatively low-temperature *** this study,a nanolam-inated(CrCoNi)_(97.4)Al_(0.8)Ti_(1.8)medium-entropy alloy with an average lamellae thickness of∼20 nm embedded by thinner nanotwins was fabricated by severe cold rolling to achieve superior thermal *** with the conventional nanotwinned CrCoNi with nanotwins inside ultra-fined grains,the hier-archical nanolaminated-nanotwinned(CrCoNi)_(97.4)Al_(0.8)Ti_(1.8) exhibits a significant annealing-induced hard-ening effect,i.e.,hardness increasing from∼250 HV in the original specimen to∼500 HV in the cold-rolled status and finally∼630 HV after annealing at 600℃for 1 *** microstructure characterizations reveal that the reduced dislocation density and formation of L1_(2)ordered domain are mainly responsible for such hardening effect,which is facilitated by the effectively suppressed coarsening with annealing temperature,i.e.,slow detwinning process and well-retained low-angle nanolamellar *** coarsening mechanisms from the cold-rolled nanolamellae to the fully recrystallized micro-equiaxed structures under the annealing temperatures ranging from 400 to 800℃ were also elucidated by atomic observations.

关键词： Annealing-induced hardening Thermal stability Nanolaminated-nanotwinned structure CrCoNi Detwinning Grain boundary migration

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Cobalt-nitrogen co-doped porous carbon sphere as highly efficient catalyst for liquid-phase cyclohexane oxidation with molecular oxygen and the active sites investigation

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Frontiers of Chemical Science and Engineering 2024年第3期18卷 101-112页

作者： lei Chen yuan Sun Jinshan Chi Wei Xiong Pingle Liu Fang Hao College of Chemical Engineering National&Local United Engineering Research Centre for Chemical Process Simulation and IntensificationXiangtan UniversityXiangtan411105China

The selective oxidation of cyclohexane to cyclohexanone and cyclohexanol(KA oil)is a challenging issue in the chemical *** present the industrial conversion of cyclohexane to cyclohexanone and cyclohexanol is normally controlled at less than 5%***,the development of highly active and stable catalysts for the aerobic oxidation of cyclohexane is necessary to overcome this low-efficiency ***,we have developed a cobalt-nitrogen co-doped porous sphere catalyst,Co-NC-x(x is the Zn/Co molar ratio,where x=0,0.5,1,2,and 4)by pyrolyzing resorcinol-formaldehyde resin *** achieved 88.28%cyclohexanone and cyclohexanol selectivity and a cyclohexane conversion of 8.88%under *** results showed that the introduction of zinc effectively alleviated the aggregation of Co nanoparticles and optimized the structural properties of the *** addition,Co0 and pyridinic-N are proposed to be the possible active species,and their proportion efficiently increased in the presence of Zn^(2+)*** this study,we developed a novel strategy to design highly active catalysts for cyclohexane oxidation.

关键词： KA oil production cyclohexane selective oxidation cobalt-nitrogen co-doped porous carbon spheres metal-organic framework

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A de novo assembled genome of the Tibetan Partridge (Perdix hodgsoniae) and its high-altitude adaptation

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Integrative Zoology 2023年第2期18卷 225-236页

作者： Xuejuan LI Xiaoyang WANG Chao YANG Liliang LIN Hao yuan Fumin lei yuan HUANG College of Life Sciences Shaanxi Normal UniversityXi’anChina School of Biological and Environmental Engeering Xi’an UniversityXi’anChina Shaanxi Institute of Zoology Xi’anChina Key Laboratory of the Zoological Systematics and Evolution Institute of Zoologythe Chinese Academy of SciencesBeijingChina

The Tibetan Partridge(Perdix hodgsoniae)is an endemic species distributed in high-altitude areas of 3600–5600 m on the Qinghai–Tibet *** explore how the species is adapted to the high elevation environment,we as-sembled a draft genome based on both the Illumina and PacBio sequencing platforms with its population genetics and genomics *** total,134.74 Gb short reads and 30.81 Gb long reads raw data were *** 1.05-Gb assembled genome had a contig N50 of 4.56 Mb,with 91.94%complete *** 17457 genes were annotated,and 11.35%of the genome was composed of repeat *** phylogenetic tree showed that *** was located at the basal position of the clade,including Golden Pheasant(Chrysolophus pictus),Common Pheasant(Phasianus colchicus),and Mikado Pheasant(Syrmaticus mikado).We found that 1014,2595,and 2732 of the 6641 one-to-one orthologous genes were under positive selection in ***,detected using PAML,BUSTED,and aBSREL programs,respectively,of which 965 genes were common under positive selec-tion with 3 different *** positively selected genes and immunity pathways relevant to high-altitude adaptation were *** family evolution showed that 99 gene families experienced signiﬁcant expansion events,while 6 gene families were under *** total number of olfactory receptor genes was relatively low in *** data provide an important resource for a further study on the evolutionary history of ***,which provides a new insight into its high-altitude adaptation mechanisms.

关键词： comparative genome genome assembly high-altitude adaptation Perdix hodgsoniae

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Zishenpingchan granules for the treatment of Parkinson＇s disease：a randomized,double-blind,placebo-controlled clinical trial

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Neural Regeneration Research 2018年第7期13卷 1269-1275页

作者： Qing Ye Xiao-lei yuan Can-Xing yuan Hong-Zhi Zhang Xu-Ming Yang Department of Neurology LONGHUA Hospital Shanghai University of Traditional Chinese Medicine Shanghai China Department of Neurology Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine Shanghai China Acupuncture and Tuina College of Shanghai University of Traditional Chinese Medicine Shanghai China

Levodopa preparations remain the preferred drug for Parkinson＇s ***,long-term use of levodopa may lead to a series of motor *** studies have shown that the combination of levodopa and Zishenpingchan granules（consisting of Radix Rehmanniae preparata,Lycium barbarum,Herba Taxilli,Rhizoma Gastrodiae,Stiff Silkorm,Curcuma phaeocaulis,Radix Paeoniae Alba,Rhizoma Arisaematis,Scorpio and Centipede） can markedly improve dyskinesia and delay the progression of Parkinson＇s disease,with especially dramatic improvements of non-motor ***,the efficacy of this combination has not been confirmed by randomized controlled *** current study was approved by the Hospital Ethics Committee and was registered in the Chinese Clinical Trial Register（registration number：Chi CTR-INR-1701194）.From December 2014 to December 2016,128 patients（72 males and 56 females,mean age of 65.78 ± 6.34 years） with Parkinson＇s disease were recruited from the Department of Neurology of Longhua Hospital and Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine in *** were equally allocated into treatment and control *** addition to treatment with dopamine,patients in treatment and control groups were given Zishenpingchan granules or placebo,respectively,for 24 *** efficacy was assessed using the Unified Parkinson＇s Disease Rating Scale,on-off phenomenon,Hoehn-Yahr grade,Scales for Outcomes in Parkinson＇s disease–Autonomic,Parkinson＇s disease sleep scale,Hamilton Anxiety Scale,Hamilton Depression Scale,Mini-Mental State Examination,and the Parkinson＇s Disease Quality of Life *** neural networks were used to determine weights at which to scale these *** results demonstrated that Zishenpingchan granules significantly reduced the occurrence of motor complications,and were useful for mitigating dyskinesia and non-motor symptoms of Parkinson＇s *** combination of Chin

关键词： nerve regeneration levodopa motion complications non-motor symptoms traditional Chinese medicine treatment artificial neural networks Zishenpingchan granules randomized controlled trials neurodegenerative diseases neural regeneration

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The Method of the SiC MOSFET Replacing the Si IGBT in the Traditional Power Electronics Converter without Redesigning the Main Circuit and the Driver Circuit

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Energy Engineering 2021年第4期118卷 1155-1170页

作者： lei Zhang Dejian Yang lei Ren Yun Cheng Qiufeng Yan Yinlong yuan School of Electrical Engineering Nantong UniversityNantong226019China

As a wide bandgap power electronics device,the SiC MOSFET has a lot of advantages over the traditional Si *** the Si IGBT with the SiC MOSFET in the existing power electronics converter is an effective means to improve the performance and promote the upgrading of the traditional ***,in order to make full use of its advantages of the SiC MOSFET,the Si IGBT in the traditional power electronics circuit cannot be simply replaced by the SiC MOSFET,but the main circuit and the driver circuit need to be redesigned because the oscillation problem and the cross-talk problem caused by the parasitic parameter are very serious when the SiC MOSFET ***,considering the low cost and the short cycle requirement of the equipment development,it is often difficult to redesign the circuit hardware structure of all *** order to resolve this contradiction,a ferrite bead based method is proposed in this *** this method,without redesigning the hardware structure of the main circuit and the driver circuit,the SiC MOSFET can be used to replace the Si-based power electronics device directly,and the loss of the converter can be reduced with small ***,the effectiveness of the proposed method is proved by experiments.

关键词： SiC MOSFET oscillation cross-talk parasitic parameter ferrite bead

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