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Population Dynamics and Key Influencing Factors of Microthrix parvicella Caused sludge Bulking

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Huanjing Kexue/Environmental science 2024年第11期45卷 6766-6774页

作者： su G.-X. Qi R. xiao s.-M. Dou D.-C. Guo Y.-X. Gao J. Tianjin Key Laboratory of Aquatic science and Technology School of Environmental and Municipal Engineering Tianjin Chengjian University Tianjin 300384 China state Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Given the frequent occurrence of the sludge bulking phenomena caused by Microthrix parvicella（M. parvicella）overgrowth during the low-temperature period in the full-scale municipal wastewater treatment plant，the filamentous bacteria dynamics of the M. parvicella population were systematically investigated during the completed bulking period using the multi-dimensional integrated filamentous monitoring method combined with the molecular quantitative method. A lab-scale reactor was constructed and successfully simulated bulking phenomena under the low-temperature condition. The trend of dominant filamentous bacterial shift and the main influencing parameters were estimated during the bulking period，to verify the key factors for filament growth and extinction of the sludge bulking phenomenon in the full-scale plant. The results showed that the bulking-caused M. parvicella was characterized by significant changes in the diversity of filamentous bacteria，and the dominant filamentous bacterial succession was reflected in the competition between the skeleton filamentous bacteria Type 0092 and Type 0041 and M. parvicella. At lower temperatures，sludge loading was an important controlling factor for the competitive growth advantage of M. parvicella：when the temperature was lower（approximately 15°C），low sludge loading［0.05 kg·（kg·d）−1］could lead to the stabilized elevation of M. parvicella，and with the loading increased to 0.1 kg·（kg·d）−1 or more，M. parvicella populations showed a targeted decline despite the presence of the low temperature factor. © 2024 science Press. All rights reserved.

关键词： filamentous bacteria Microthrix parvicella population dynamics sludge bulking sludge loading

PERIODIC CARDINAL INTERPOLATORY WAVELETs

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Chinese Annals of Mathematics,series B 1998年第2期19卷 133-142页

作者： Chen H. xiao s. Institute of Mathematics Academia Sinica Beijing 100080 China

The authors construct periodic interpolating wavelets and their duals from a periodic function g(x) whose Fourier coefficients are positive. The corresponding decomposition and reconstruction algorithm is also given. The spline example shows that such kind of wavelets shares good localization with any desired regularity and symmetry. The construction depends essentially on the finite Fourier Transformation and the theory of circulant matrix.

关键词： Periodic wavelet Multiresolution Cardinal Interpolation Dual basis Circulant matrix

REsEARCH ON THE sELECTION OF FRICTION MODELs IN THE FINITE ELEMENT sIMULATION OF WARM EXTRUsION

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Acta Metallurgica sinica(English Letters) 2003年第2期16卷 90-96页

作者： X.B.Lin H.s.xiao Z.L.Zhang National Die and Mold CAD Engineering Research Center Shanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030ChinaNational Die and Mold CAD Engineering Research CenterShanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030ChinaNational Die and Mold CAD Engineering Research CenterShanghai Jiao Tong University1954 Hua Shan RoadShanghai 200030China

During the process of finite element simulation of precision warm forging, the selection of friction models has a direct effect on the precision accuracy of finite element simulation results. Among all the factors which influence the selection of friction models, the distribution rule of normal stress at the tool-workpiece interface is a key one. To find out the distribution rule of normal stress at the tool-workpiece interface, this paper has made a systematic research on three typical plastic deformation processes: forward extrusion, backward extrusion, and lateral extrusion by a method of finite element simulation. Then on the base of synthesizing and correcting traditional friction models, a new general friction model which is fit for warm extrusion is developed at last.

关键词： friction model warm extrusion finite element simulation

ALLOYING EFFECT OF Ni AND Cr ON THE WETTABILITY OF COPPER ON W sUBsTRATE

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Acta Metallurgica sinica(English Letters) 2008年第5期21卷 369-379页

作者： X.H. Yang P. xiao s.H. Liang J.T. Zou Z.K. Fan shaanxi Key Laboratory for Electrical Materials and Infiltration Technology School of Materials Science and Engineering Xi＇an University of Technology Xi＇an 710048 China

By the sessile drop technique, the wettability of Cu/W systems with the additions of Ni and Cr has been studied under vacuum atmosphere. Effects of Ni and Cr contents and wetting temperatures on the wettability and the wetting mechanisms of copper on W substrate have been investigated in detail. The results show that the wetting angles of Cu on the W substrate are decreased with an increase in the content of Ni or Cr, and also decrease with raising the wetting temperatures. sEM, EPMA, and X-ray diffraction have been used to analyze the interracial characteristics of the CuNi/W and CuCr/W systems. The results reveal that there is a transition layer about 2- 3μm in the interface of Cu-4.0 wt pct Ni/W, in which the interrnetallic phase Ni4W is precipitated. As to CuCr/W system, no reaction occurs at the interface. The two factors are that the contents of Cr and Ni and the infiltration temperature must be chosen appropriately in order to control the interfacial dissolution and reaction when the Cu- W alloys are prepared by the infiltration method.

关键词： Wettability Contact angles Cu, Cr, Ni W substrate

surface Polarization Effects on Collapse Transition of Polyelectrolyte Brushes

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Chinese Journal of Polymer science 2024年第9期42卷 1313-1320,I0006页

作者： xiao-Fei Xu state Key Laboratory of Chemical Engineering and school of Chemical Engineering East China University of Science and TechnologyShanghai200237China

Polyelectrolyte brushes(PEBs)are commonly used to modify surface that have attracted great research *** dielectric permittivity of the grafted surface is typically significantly different from that of solution,which results in surface polarization(sP)effect with a jump of electric *** is thus important to study how sP alters the PEB’s structure and *** this work,the sP effects on PEB structure was studied using a statistical thermodynamic *** free energy functional to describe sP effect was constructed by using the image-charge ***,the electrostatic potential was solved from a modified Poisson-Boltzmann equation taking the ion solvation effect into *** the absence of sP,the thickness of PEB exhibited a continuous collapse transition when decreasing the solvent *** the presence of sP,the collapse became a jump-like *** energy analysis showed that the long-range Coulombic interaction dominated the transition because of the enhanced counterion condensation in the presence of *** theory provides an effective tool to study sP effect on PEBs,and the results explain the underlying physics in PEB collapse transition.

关键词： surface polarization Polyelectrolyte brush Image charge Ion solvation Polyelectrolyte collapse transition

Bioinspired nanomaterials for wearable sensing and human–machine interfacing

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Nano Research 2024年第2期17卷 445-461页

作者： Vishesh Kashyap Junyi Yin xiao xiao Jun Chen Department of Bioengineering University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Mechanical and Aerospace Engineering University of CaliforniaLos AngelesLos AngelesCA 90095USA

The inculcation of bioinspiration in sensing and human–machine interface(HMI)technologies can lead to distinctive characteristics such as conformability,low power consumption,high sensitivity,and unique properties like self-healing,self-cleaning,and *** sensing and HMI are fields rife with opportunities for the application of bioinspired nanomaterials,particularly when it comes to wearable sensory systems where biocompatibility is an additional *** review discusses recent development in bioinspired nanomaterials for wearable sensing and HMIs,with a specific focus on state-of-the-art bioinspired capacitive sensors,piezoresistive sensors,piezoelectric sensors,triboelectric sensors,magnetoelastic sensors,and electrochemical *** also present a comprehensive overview of the challenges that have hindered the scientific advancement in academia and commercialization in the industry.

关键词： bioinspired nanomaterials human–machine interface wearable sensors wearable bioelectronics

Decentralized Optimal Control and stabilization of Interconnected systems With Asymmetric Information

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IEEE/CAA Journal of Automatica sinica 2024年第3期11卷 698-707页

作者： Na Wang xiao Liang Hongdan Li xiao Lu the College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266000China the school of Automation and Electrical Engineering Linyi UniversityLinyi 276000China the College of Energy storage Technology Shandong University of Science and TechnologyQingdao 266000China

The paper addresses the decentralized optimal control and stabilization problems for interconnected systems subject to asymmetric *** with previous work,a closed-loop optimal solution to the control problem and sufficient and necessary conditions for the stabilization problem of the interconnected systems are given for the first *** main challenge lies in three aspects:Firstly,the asymmetric information results in coupling between control and estimation and failure of the separation ***,two extra unknown variables are generated by asymmetric information(different information filtration)when solving forward-backward stochastic difference ***,the existence of additive noise makes the study of mean-square boundedness an *** adopted technique is proving and assuming the linear form of controllers and establishing the equivalence between the two systems with and without additive noise.A dual-motor parallel drive system is presented to demonstrate the validity of the proposed algorithm.

关键词： Asymmetric information decentralized control forwardbackward stochastic difference equations interconnected system stalibization

stretchable fiber strain sensors for wearable biomonitoring

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National science Review 2024年第7期11卷 70-71页

作者： shumao Xu xiao xiao Jun Chen Department of Bioengineering University of California

Wearable bioelectronics have gained significant attention since they may play a role in transforming current healthcare from a reactive and disease-centric model to a personalized one with a focus on disease preventio...

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8-chloroadenosine induces apoptosis in human MOLT-4 cell line

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Chinese science Bulletin 1997年第7期42卷 592-597页

作者： Wang, XT Zheng, DX Liu, R Liu, YX xiao, s Min, JM Zheng, P Zhang, LH Liu, sL CHINEsE ACAD MED sCI PEKING UNION MED COLLSTATE KEY LAB MED MOL BIOLBEIJING 100005PEOPLES R CHINA

THE 8-chloroadenosine (8CA) is a novel analog of adenosine synthesized in the National Research Laboratories of Natural and Biomimetic Drugs. Fang et al. reported that 8CA is capable of inhibiting the cell growth in v... 详细信息

关键词： 8-chloroadenosine apoptosis MOLT-4 cells.