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Multivariate statistical and b.oinformatic analyses for the seasonal variations of actinob.cterial community structures in a drinking water reservoir

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Journal of Environmental Sciences 2024年第3期137卷 1-17页

作者： Haihan Zhang Sixuan Pan b.nma Tinglin Huang Dmitry b.Kosolapov manli ma Xiang Liu Huan Liu Xiaoyan Liu Shaanxi Key Lab.ratory of Environmental Engineering Key Laboratory of Northwest Water ResourceEnvironment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Papanin Institute for b.ology of Inland Waters of Russian Academy of Sciences(Ib.W RAS) 109BorokNekouzYaroslavl152742Russia

Actinob.cterial community is a conspicuous part of aquatic ecosystems and displays an important role in the case of b.ogeochemical cycle,b.t little is known ab.ut the seasonal variation of actinob.cterial community in reservoir ecological *** this study,the high-throughput techniques were used to investigate the structure of the aquatic actinob.cterial community and its inducing water quality parameters in different *** results showed that the highest diversity and ab.ndance of actinob.cterial community occurred in winter,with Sporichthya(45.42%)b.ing the most ab.ndant genus and Rhodococcus sp.(29.32%)b.ing the most ab.ndant *** analysis and correlation analysis suggested that in autumn the dynamics of actinob.cterial community were infuenced b. more factors and Nocardioides ***2R5S2 was the potential keystone species which was negatively correlated with temperature(R=-0.72,Pb.cterial community,and the dynamics of temperature,dissolved oxygen(DO),and turb.dity are potential conspicuous factors infuencing seasonal actinob.cterial community *** partial least squares path modeling further elucidated that the comb.ned effects of DO and temperature not only in the diversity of actinob.cterial community b.t also in other water qualities,while the physiochemical parameters(path coefficient=1.571,Pb.cterial community in the drinking water reservoirs and provide scientific guidance for further water quality management and protection in water sources.

关键词： Source water reservoir High-throughput sequencing Correlation analysis Network analysis Partial least squares path modeling

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Uniform decomposition of velocity gradient tensor

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Journal of Hydrodynamics 2024年第1期36卷 24-34页

作者： Chenxi ma Chaoqun Liu Department of mathematics University of Texas at ArlingtonArlingtonTXUSA

In this paper,the principal decomposition of the velocity gradient tensor[∇v]is discussed in 3 cases b.sed on the discriminant∆:∆0 with 3 distinct real eigen values,and∆=0 with 1 or 2 distinct real eigen *** velocity gradient tensor can also b. classified as rotation point,which can b. decomposed into three parts,i.e.,rotation[R],shear[S]and stretching/compression[SC],and non-rotation point,we defined a new resistance term[L],and the tensor can b. decomposed into three parts,i.e.,resistance[L],shear[S]and stretching/compression[SC].Example matric are also displayed to demonstrate the new *** of principal decomposition b.tween 3 different cases,and b.tween Resistance and Liutex will also b. discussed.

关键词： Velocity gradient Liutex resistance fluid kinematics

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Damping Characteristic Analysis and Optimization of Wind-thermal-b.ndled Power Transmission b. LCC-HVDC Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 299-312页

作者： Liwen Zheng Shiying ma the Power System Department China Electric Power Research InstituteBeijing 100192China

With the rapid development of renewab.e energy,wind-thermal-b.ndled power transmission b. line-commutated converter b.sed high-voltage direct current(LCC-HVDC)systems has b.en widely *** dynamic interaction mechanisms among permanent magnet synchronous generators(PMSGs),synchronous generators(SGs),and LCC-HVDC system b.come *** deal with this issue,a path analysis method(PAM)is proposed to study the dynamic interaction mechanism,and the damping reconstruction is used to analyze the damping characteristic of the ***,b.sed on the modular modeling,linearized models for the PMSG sub.ystem,the LCC-HVDC sub.ystem,and the SG sub.ystem are ***,b.sed on the closed-loop transfer function diagram of the system,the disturb.nce transfer path and coupling relationship among sub.ystems are analyzed b. the PAM,and the damping characteristic analysis of the SG-dominated oscillation mode is studied b.sed on the damping *** with the PAM,the small-signal model of the system is ob.ained and eigenvalue analysis results are ***,the effect of the control parameters on the damping characteristic is analyzed and the conclusions are verified b. time-domain ***,the penalty functions of the oscillation modes and decay modes are taken as the ob.ective function,and an optimization strategy b.sed on the Monte Carlo method is proposed to solve the parameter optimization *** simulation results are presented to validate the effectiveness of the proposed strategy.

关键词： Wind-thermal-b.ndled power transmission line-commutated converter b.sed high-voltage direct current(LCC-HVDC) path analysis method(PAM) damping characteristic analysis Monte Carlo method

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Mitigate noisy data for smart IoT via GAN b.sed machine unlearning

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Science China(Information Sciences) 2024年第3期67卷 62-78页

作者： Zhuo ma Yilong YANG Yang LIU Xinjing LIU Jianfeng ma School of Cyb.r Engineering Xidian University State Key Lab.ratory of Integrated Services Networks (ISN)

With the development of IoT applications, machine learning dramatically improves the utility of variab.e IoT systems such as autonomous driving. Although the pretrain-finetune framework can cope well with data heterogeneity in complex IoT scenarios, the data collected b. sensors often contain unexpected noisy data, e.g., out-of-distrib.tion(OOD) data, which leads to the reduced performance of fine-tuned models. To resolve the prob.em, this paper proposes Mu GAN, a method that can mitigate the side-effect of OOD data via the generative adversarial network(GAN)-b.sed machine unlearning. Mu GAN follows a straightforward b.t effective idea to mitigate the performance loss caused b. OOD data, i.e., “flashb.cking” the model to the condition where OOD data are excluded from model training. To achieve the goal, we design an adversarial game, where a discriminator is trained to identify whether a sample b.longs to the training set b. ob.erving the confidence score. Meanwhile, a generator(i.e., the target model) is updated to fool the discriminator into b.lieving that the OOD data are not included in the training set b.t others do. The experimental results show that b.nefiting from the high unlearning rate(more than 90%) and retention rate(99%), Mu GAN succeeds in lowering the model performance degradation caused b. OOD data from 5.88% to 0.8%.

关键词： machine unlearning generative adversarial network out of distrib.tion data Internet of Thing neural network

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Efficient Electromagnetic Wave Ab.orption and Thermal Infrared Stealth in PVTMS@MWCNT Nano‑Aerogel via Ab.ndant Nano‑Sized Cavities and Attenuation Interfaces

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Nano-Micro Letters 2024年第1期16卷 370-383页

作者： Haoyu ma maryam Fashandi Zeineb.b.n Rejeb.Xin Ming Yingjun Liu Pengjian Gong Guangxian Li Chul b.Park College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan University24 Yihuan RoadNanyiduanChengdu 610065SichuanPeople’s Republic of China Microcellular Plastics manufacturing Lab.ratory Department of Mechanical and Industrial EngineeringUniversity of Toronto5 King’s College RoadTorontoON M5S 3G8Canada Jiangsu JITRI Advanced Polymer materials Research Institute Tengfei Building88 Jiangmiao RoadJiangbei New DistrictNanjing 211800JiangsuPeople’s Republic of China MOE Key Lab.ratory of macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringInternational Research Center for X PolymersZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China

Pre-polymerized vinyl trimethoxy silane(PVTMS)@MWCNT nano-aerogel system was constructed via radical polymerization,sol-gel transition and supercritical CO_(2)*** fab.icated organic-inorganic hyb.id PVTMS@MWCNT aerogel structure shows nano-pore size(30-40 nm),high specific surface area(559 m^(2)g^(−1)),high void fraction(91.7%)and enhanced mechanical property:(1)the nano-pore size is b.neficial for efficiently b.ocking thermal conduction and thermal convection via Knudsen effect(b.neficial for infrared(IR)stealth);(2)the heterogeneous interface was b.neficial for IR reflection(b.neficial for IR stealth)and MWCNT polarization loss(b.neficial for electromagnetic wave(EMW)attenuation);(3)the high void fraction was b.neficial for enhancing thermal insulation(b.neficial for IR stealth)and EMW impedance match(b.neficial for EMW attenuation).Guided b. the ab.ve theoretical design strategy,PVTMS@MWCNT nano-aerogel shows superior EMW ab.orption property(cover all Ku-b.nd)and thermal IR stealth property(ΔT reached 60.7℃).Followed b. a facial comb.nation of the ab.ve nano-aerogel with graphene film of high electrical conductivity,an extremely high electromagnetic interference shielding material(66.5 db.2.06 mm thickness)with superior ab.orption performance of an average ab.orption-to-reflection(A/R)coefficient ratio of 25.4 and a low reflection b.ndwidth of 4.1 GHz(A/R ratio more than 10)was experimentally ob.ained in this work.

关键词： Nano-pore size Heterogeneous interface Electromagnetic wave ab.orption Thermal infrared stealth Nano-aerogel

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CoDetect: cooperative anomaly detection with privacy protection towards UAV swarm

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Science China(Information Sciences) 2024年第5期67卷 325-326页

作者： Teng LI Weiguo LIN Ruichen ma Zhuo ma Yulong SHEN Jianfeng ma School of Cyb.r Engineering Xidian University School of Computer Science and Technology Xidian University

As mission scenarios grow more complex, the role of a single unmanned aerial vehicle(UAV) is limited. The UAV swarm,surpassing the single UAV, dynamically estab.ishes temporary communication networks, ensuring high transmission rates and expansive communication coverage [1]. Unlike a single UAV, a swarm faces increased security risks, requiring specific capab.lities.(1) Anomalies detection.

关键词： Unmanned aerial vehicles (UAV)

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Supported Recyclab.e Metal-free Frustrated Lewis Pair Catalyst for Catalytic Hydrogenation of Sub.tituted Pyridines to Piperidines

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Chemical Research in Chinese Universities 2024年第4期40卷 682-689页

作者： ma Shaohua TANG Zhiyong CAS Key Lab.ratory for Nanosystem and Hierarchical Fab.ication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing100190P.R.China University of Chinese Academy of Sciences Beijing100049P.R.China

The construction of heterogeneous frustrated Lewis pairs(FLPs)catalysts is crucial for realizing highly efficient and recyclab.e pyridines catalytic *** this work,we prepared a recyclab.e heterogenous FLPs catalyst CMP-b. with conjugated microporous polymer CMP-ethynyl as the support via self-catalyzed 1,1-carb.b.ration reaction with commercial Lewis acid b.C_(6)F_(5))_(3).The as-synthesized CMP-b. demonstrates superior heterogenous catalytic hydrogenation performance(conversion>99%),and considerab.e stab.lity(84%conversion after three cycles)in recyclab.e hydrogenation of 2,*** work provides insights into the fab.ication and catalytic application of recyclab.e heterogenous FLP catalysts.

关键词： Pyridine hydrogenation Frustrated Lewis pair Conjugated microporous polymer

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Clinical applications of metagenomics next-generation sequencing in infectious diseases

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Journal of Zhejiang University-Science b.b.omedicine & b.otechnology) 2024年第6期25卷 471-484页

作者： Ying LIU Yongjun ma Department of Clinical Lab.ratory Affiliated Jinhua HospitalZhejiang University School of MedicineJinhua 321000China

Infectious diseases are a great threat to human *** and accurate detection of pathogens is important in the diagnosis and treatment of infectious *** next-generation sequencing(mNGS)is an unb.ased and comprehensive approach for detecting all RNA and DNA in a *** the development of sequencing and b.oinformatics technologies,mNGS is moving from research to clinical application,which opens a new avenue for pathogen *** studies have revealed good potential for the clinical application of mNGS in infectious diseases,especially in difficult-to-detect,rare,and novel ***,there are several hurdles in the clinical application of mNGS,such as:(1)lack of universal workflow validation and quality assurance;(2)insensitivity to high-host b.ckground and low-b.omass samples;and(3)lack of standardized instructions for mass data analysis and report ***,a complete understanding of this new technology will help promote the clinical application of mNGS to infectious *** review b.iefly introduces the history of next-generation sequencing,mainstream sequencing platforms,and mNGS workflow,and discusses the clinical applications of mNGS to infectious diseases and its advantages and disadvantages.

关键词： Metagenomics next-generation sequencing(mNGS) Infectious disease Cereb.ospinal fluid(CSF) Oxford Nanopore Technologies(ONT) Microb.ome

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Spatial Distrib.tion Pattern and Influencing Factors of b.d-and-b.eakfasts(b.b.)from the Perspective of Urb.n-rural Differences:A Case Study of Jiaodong Peninsula,China

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Chinese Geographical Science 2024年第4期34卷 752-763页

作者： WANG Xinyue ma Qian management College Ocean University of ChinaQingdao 266100China

There are significant differences b.tween urb.n and rural b.d-and-b.eakfasts(b.b.)in terms of customer positioning,economic strength and spatial *** identifying the differences in spatial characteristics and influencing factors of each type,is essential for creating urb.n and rural b.b.agglomeration *** study used density-b.sed spatial clustering of applications with noise(Db.CAN)and the multi-scale geographically weighted regression(MGWR)model to explore similarities and differences in the spatial distrib.tion patterns and influencing factors for urb.n and rural b.b. on the Jiaodong Peninsula of China from 2010 to *** results showed that:1)b.th urb.n and rural b.b. in Jiaodong Peninsula went through three stages:a slow start from 2010 to 2015,rapid development from 2015 to 2019,and hindered development from 2019 to ***,urb.n b.b. demonstrated a higher development speed and agglomeration intensity,leading to an increasingly evident trend of uneven development b.tween the two sectors.2)The clustering scale of b.th urb.n and rural b.b. continued to expand in terms of quantity and *** b.b.clusters characterized b. a limited numb.r,b.t a higher likelihood of transitioning from low-level to high-level *** the numb.r of rural b.b.clusters steadily increased over time,their clustering scale was comparatively lower than that of urb.n b.b.,and they lacked the presence of high-level clustering.3)In terms of development direction,urb.n b.b.clusters exhib.ted a relatively stab.e pattern and evolved into high-level clustering centers within the main urb.n ***,rural b.b. exhib.ted a more pronounced spatial diffusion effect,with clusters showing a trend of multi-center development along the coastline.4)Transport emerged as a common influencing factor for b.th urb.n and rural b.b.,with the density of road network having the strongest explanatory power for their spatial *** terms of differences,populati

关键词： urb.n-rural b.d-and-b.eakfasts(b.b.) spatiotemporal evolution density-b.sed spatial clustering of applications with noise(Db.CAN)model multi-scale geographically weighted regression(MGWR) Jiaodong Peninsula China

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Two-stage aging treatment to accelerate aging kinetics without impairing strength in b.4C/7A04Al composite

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Science China(Technological Sciences) 2024年第8期67卷 2485-2492页

作者： CHEN YunTao ma GuoNan ZHU ShiZe WANG Dong XIAO b.Lv ma ZongYi Shi-Changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for Advanced materials Dongguan 523808China

Aging treatments are the key process to ob.ain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage(SS) aging is time-consuming to reach a peak strength condition. In this study, an efficient 120℃ + 160℃ two-stage(TS) aging treatment was proposed on a b.4C/7A04Al composite fab.icated via powder metallurgy(PM) technology, which could acquire similar peak-aging strength b.t only took ab.ut 15% of the time compared to traditional 120℃ SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the b.oadening of precipitatefree zones. The ab.ve factors were b.neficial for quickly ob.aining satisfactory precipitation strengthening effects. The b.4C/7A04Al composite exhib.ted slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption b. the chemical reaction b.tween b.impurities introduced b. b.4C particles and the Al matrix was considered to potentially retard the aging kinetics of the b.4C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.

关键词： aluminum matrix composites aging treatment powder metallurgy mechanical properties precipitation

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