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SSRN 2024年

作者： Gui, Feng Zhou, Xuan Huang, Ke Li, Xue Yan, Zhihan Luo, Zhen Yang, Liwen Huang, Jianyu Wang, Gang Xu, Guobao Ou, Xing Hunan Provincial Key laboratory of Thin Film Materials and Devices School of Materials Science and Engineering Xiangtan University Hunan411105 China Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China School of Physics and Optoelectronics Xiangtan University Hunan411105 China National Energy Metal Resources and New Materials Key Laboratory School of Metallurgy and Environment Central South University Hunan Changsha410083 China

It is urgently required that polyethylene oxide (PEO) based electrolytes exhibit high Li+ conductivity and exceptional interfacial compatibility at wide temperature. In this study, La-doped two-dimensional (2D) Li4Ti5O12 nanosheets (La-LTO NSs) are firstly introduced into PEO (La-LTO/PL) to achieve composite polymer electrolytes (CPEs). The La doping can regulate the micro-structure of LTO NSs for realizing high aspect ratio and introducing rich oxygen vacancy, which significantly enhance the amorphous region and anchor adequate TFSI-. Furthermore, the DFT calculation reveals that enrichment of charge density gather around La element and oxygen vacancies, indicating the stronger interaction between La-LTO NSs and PEO/TFSI-. Therefore, the CPEs deliver multiple ion-transport channels including the interface between the La-LTO NSs and PEO, PEO chains and La-LTO NSs, enabling fast Li-ion transport and highly stable interface. As a result, the CPEs exhibit impressive ionic conductivity (2×10-4 S cm-1 under 30°C, 1×10-3 S cm-1 under 60°C) and steady electrochemical impedance value during 22 days. While the all-solid-state Li|LiFePO4 (Li|LFP) batteries deliver remarkable cycle stability for 400 cycles with high-capacity retention of 80% at 0.2 C under 30°C. Moreover, the pouch cell of Li|LFP maintains approximately 100% capacity retention after 100 cycles. This work promotes the applications of CPEs in high-performance solid-state Li batteries. © 2024, The Authors. All rights reserved.

关键词： Aspect ratio

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Anomaly Detection Via Kpis for Software Performance Failures

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SSRN 2022年

作者： Wang, Shuguang Lu, Minyan Kong, Shiyi Ai, Jun Wang, Jie Wong, W. Eric The Key Laboratory on Reliability and Environment Engineering Technology School of Reliability and Systems Engineering Beihang University Beijing100191 China Department of Computer Science University of Texas at Dallas 2601 N Floyd Road RichardsonTX75083 United States

As cloud services have become more popular, high-reliability requirements for distributed storage systems have also increased significantly. However, the software systems often suffer performance failures during long-term running. Anomaly detection based on performance indicators is an effective approach for performance failures. To handle the complexity of the distributed databases, this paper proposes a novel anomaly detection methodology via key performance indicators monitored at different levels. Then, a variance inflation factor (VIF) feature selection method is proposed to reduce the multicollinearity problem in the multivariate time series of performance indicators. For a long-running software system, some unavoidable noise will be introduced when monitoring these performance indicators. Therefore, it is necessary to explore the suitable feature processing method to enhance features and eliminate noise interference from indicators. Discrete wavelet analysis has a superior performance in feature extraction in signal analysis. Thus, in this paper, discrete wavelet transform is modified to create an adaptive DWT for noise reduction and feature extraction by taking advantage of the multiresolution analysis. Then, unsupervised anomaly detection algorithms are used to detect the expected indicator outliers. The anomaly detection performance of the proposed method is evaluated in terms of precision, recall, and the F1-score. Finally, this approach is verified through the experiments conducted on Cassandra, and the F1-score is 0.974 which means this approach is effective. © 2022, The Authors. All rights reserved.

关键词： Benchmarking

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“Liquid diode”with“gating”based on shape memory sponge

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science China Materials 2022年第9期65卷 2591-2599页

作者： Yingbin Song Hua Lai Xiaoyu Jiao Pengchang Liu Dongdong Hu Hongjun Kang Dongjie Zhang Zhimin Fan Zhimin Xie Yuyan Liu Lei Jiang Zhongjun Cheng State Key Laboratory of Urban Water Resource&Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Shanghai Institute of Space Power-sources/State Key Laboratory of Space Power-sources Technology Shanghai 201100China Institute of the Sixth Research Institute of China Aerospace Science and Industry Corporation Hohhot 010000China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China

Superwetting Janus membranes with unique ability in unidirectional liquid transportation,known as“liquid diode”,have attracted much ***,endowing the Janus membranes with smart controllability becomes a new research ***,related reports are still rare and limited in regulating surface wettability,which can hardly avoid some imperfections such as the necessary constant external stimuli and change of water ***,we advanced an unprecedented strategy to smartly control the liquid permeation on Janus membrane by regulating the pore structure of the material,and report a smart Janus sponge(SJS)that is constructed from a super-hydrophilic sponge(SHS)and a hydrophobic shape memory sponge(HSMS).The pore size and thickness of the HSMS can be reversibly changed as it is pressed/recovered based on the excellent shape memory *** the variation of the HSMS,the water permeation performance can be smartly controlled,which is embodied in that only when the HSMS is in the pressed state,SJS acts as a“liquid diode”,otherwise it can prevent liquid from penetrating on either ***,based on the smart controllability of the SJS,we simulated the scene of drug administration and demonstrated its potential application in the field of wound *** work firstly reports a shape memory Janus membrane and provides a new way to control the liquid permeation,which can successfully avoid those shortcomings existing in current wetting-responsive Janus *** its excellent controllability,we believe it has potential applications in intelligent manipulation of liquid.

关键词： Janus membrane shape memory sponge superwetting smart controllability

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Seamount detection using SWOT-derived vertical gravity gradient: advancements and challenges

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Geophysical Journal International 2024年第3期237卷 1780-1793页

作者： Yu, Daocheng Weng, Zequn Hwang, Cheinway Zhu, Huizhong Luo, Jia Yuan, Jiajia Ge, Sihao School of Geomatics Liaoning Technical University Fuxin123000 China Institute of Statistics National Yang Ming Chiao Tung University 1001 Ta Hsueh Road TWN Hsinchu300 Taiwan Zhejiang Rural Commercial Digital Technology Co. Ltd Hangzhou311200 China Department of Civil Engineering National Yang Ming Chiao Tung University 1001 Ta Hsueh Road TWN Hsinchu300 Taiwan School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan430079 China Key Laboratory of Geospace Environment and Geodesy Ministry of Education 129 Luoyu Road Wuhan430079 China School of Geomatics Anhui University of Science and Technology 168 Taifeng Street Huainan232001 China

Launched on 2022 December 16, the Surface Water and Ocean Topography (SWOT) satellite, using synthetic aperture radar interferometric techniques, measures sea surface heights (SSHs) across two 50-km-wide swaths, offering high-resolution and accurate 2-D SSH observations. This study explores the efficiency of SWOT in seamount detection employing the vertical gravity gradient (VGG) derived from simulated SWOT SSH data. Simulated circular and elliptical seamounts (height: 900-1500 m) are integrated within the South China Sea's 4000 m background depths. Geoid perturbations induced by these seamounts are extracted through the residual depth model principle, subsequently merged with the DTU21MSS model for simulating SWOT SSH observations. For comparative assessment, SSH data from Jason-2 and Cryosat-2 are included. An automatic algorithm (AIFS) is presented to identify seamount centres and base polygons using VGG derived from simulated altimeter SSH data. The analysis reveals SWOT-derived VGGs precisely locate all seamount centres, base polygons and elliptical seamount azimuths. The merged Jason-2 and Cryosat-2 data face challenges with identifying small circular and elliptical seamounts. Detecting long narrow elliptical seamounts remains arduous;however, SWOT-derived VGGs successfully elucidate the approximate shapes and major axis azimuths of the elliptical seamounts. Validated against 'true values' of VGG, the root-mean-squared deviation (RMSD) of SWOT-derived VGG stands at 1.33 Eötvös, whereas the merged Jason-2 and Cryosat-2 data exhibit an RMSD of 1.93 Eötvös. This study shows the enhanced capability of SWOT from its high-resolution 2-D SSH observations in advancing seamount detection via satellite-derived VGG. We identify challenges and recommend improved detections using data integration and machine learning. © 2024 The Author(s). Published by Oxford University Press on behalf of The Royal Astronomical Society.

关键词： Surface waters

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Recent Unusual Consecutive Spring Tropical Cyclones in North Atlantic and Winter Oceanic Precursor Signals

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Journal of Meteorological Research 2023年第2期37卷 208-217页

作者： Hong HUANG Jeremy Cheuk-Hin LEUNG Johnny CLCHAN Jimin LIU Weihong QIAN Banglin ZHANG College of Meteorology and Oceanography National University of Defense TechnologyChangsha410015 Guangzhou Institute of Tropical and Marine Meteorology/Guangdong Provincial Key Laboratory of Regional Numerical Weather Prediction China Meteorological AdministrationGuangzhou510640 School of Energy and Environment City University of Hong KongHong Kong999077 Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082 College of Atmospheric Sciences Lanzhou UniversityLanzhou730000 Shanghai Typhoon Institute China Meteorological AdministrationShanghai 200030 Asia-Pacific Typhoon Collaborative Research Center Shanghai201306 Department of Atmospheric and Oceanic Sciences Peking UniversityBeijing100871

Although the North Atlantic(NA)hurricane season has been reported to start increasingly early,historical longterm changes in NA spring tropical cyclone(TC)activity have not been examined in previous *** find that spring TCs have become more frequent and intense,and they have more closely approached the US coastline over the past four decades,thus increasing the probability of landfall.A long-term increase in the NA sea surface temperature(SST)and northward incursion of warm water may be responsible for the increasing number,intensity,and northward shift of spring *** addition,the interdecadal winter NA SST tripole mode may induce a North Atlantic Oscillation(NAO)-like atmospheric response in the following spring,which controls spring TC tracks via modulating the strength and position of the NA subtropical high(or the Bermuda high).The superposition of the interdecadal positive winter SST tripole on the NA warming trend has contributed to the anomalous enhancement and northward shift of spring TC activity,increasing the spring TC risks in the US in the past six years.

关键词： hurricane climate change spring tropical cyclone preseason storm

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Microstructure and mechanical properties of(TiZrNbTaMo)C high-entropy ceramic

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Journal of Materials science & technology 2020年第4期39卷 99-105页

作者： Kai Wang Lei Chen Chenguang Xu Wen Zhang Zhanguo Liu Yujin Wang Jiahu Ouyang Xinghong Zhang Yudong Fu Yu Zhou School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin150001China Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin150001China College of Materials Science and Engineering Harbin Engineering UniversityHarbin150001China

A high-entropy(Ti Zr Nb Ta Mo)C ceramic has been successfully fabricated by hot pressing the newlysynthesized quinary carbide powder to investigate its microstructure and mechanical *** carbothermal reduction process of equimolar quinary metallic oxides at 1500℃for 1 h generates a carbide powder mixture,which consists mainly of Ta C-and Zr C-based solid *** as-synthesized powder was then sintered to form a single-phase high-entropy ceramic by a two-step hot pressing at 1850℃for1 h and 2100℃for 0.5 h,*** high-entropy ceramic exhibits a fine grain size of about 8.8μm,a high compositional uniformity and a high relative density of 98.6%by adding Mo as the strategic main *** measured nanohardness values of(TiZrNbTaMo)C ceramic are 25.3 GPa at 9.8 N and 31.3 GPa at 100 m N,respectively,which are clearly higher than those of other available high-entropy carbide ceramics.

关键词： High-entropy ceramic (TiZrNbTaMo)C Microstructure Enhanced hardness

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Tuning photoresponse of graphene-black phosphorus heterostructure by electrostatic gating and photo-induced doping

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Chinese Chemical Letters 2022年第1期33卷 368-373页

作者： Yanpeng Liu Ming Yang Junpeng Lu Ying Liu Hongwei Liu Erwen Zhang Wei Fu Junyong Wang Zhenliang Hu Jun Yin Goki Eda Shijie Wang Jiabao Yi Ajayan Vinu Kian Ping Loh Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina School of Physics Southeast UniversityNanjing 211189China College of Jincheng Nanjing University of Aeronautics and AstronauticsNanjing 211156China School of Physics and Technology Nanjing Normal UniversityNanjing 210023China Department of Chemistry National University of SingaporeSingapore 117543Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research(A*STAR)Innovis 138634Singapore Global Innovative Centre for Advanced Nanomaterials College of EngineeringScience and EnvironmentThe University of NewcastleNewcastle NSW 2308Australia

Metal-semiconductor diodes constructed from two-dimensional(2D)van der Waals heterostructures show excellent gate electrostatics and a large built-in electric field at the tunnel junction,which can be exploited to make highly sensitive *** we demonstrate a metal-semiconductor photodiode constructed by the monolayer graphene(Gr)on a few-layer black phosphorus(BP).Due to the presence of a built-in potential barrier(~0.09±0.03 eV)at the Gr-BP interface,the photoresponsivity of the Gr-BP device is enhanced by a factor of 672%,and the external quantum efficiency(EQE)increases to648%from 84%of the bare *** gating allows the BP channel to be switched between p-type and n-type *** further demonstrate that excitation laser power can be used to control the current polarity of the Gr-BP device due to photon-induced *** versatility of the Gr-BP junctions in terms of electrostatic bias-induced or light-induced switching of current polarity is potentially useful for making dynamically reconfigurable digital circuits.

关键词： Black phosphorous Graphene Heterostructure Gate-tunable Photodetector Photoinverter

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Cyanobacterial blooms in China:ecology,toxicity,and treatment

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Journal of Oceanology and Limnology 2022年第5期40卷 1693-1695页

作者： Renhui LI Xiaoli SHI Nanqin GAN Junyi ZHANG Xuechu CHEN National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution Wenzhou UniversityWenzhou 325035China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China Wuxi Environmental Monitoring Center Wuxi 214121China School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Cyanobacterial blooms are one of the major threats to the health of aquatic ecosystems,and are increasing globally due to the synergistic eff ects of human activities and global climate *** 7^(th) national Cyanobacteria Bloom Forum was successfully held in May 28-30,2021 in Guiyang,Guizhou Province,*** forum established a platform for exchanging views on the concerns of cyanobacterial blooms from Chinese researchers,lake managers,and treatment *** special issue,“Cyanobacterial blooms in China:ecology,toxicity,and treatment”in Journal of Oceanography and Limnology,presents a collection of 14 papers on the physiological features and the infl uence on their concurrent aquatic biology of diff erent cyanobacterial groups.

关键词： treatment Guizhou globally

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Two Birds with One Stone Strategy: Selective Uranium Extraction and Detection by a Fluorescent Covalent Organic Framework with High-Affinity Binding Sites

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SSRN 2025年

作者： Luo, Yu Li, Nan Tian, Jinhao Pan, Jingwen Su, Ruidian Turkevych, Volodymyr Wang, Lei Turkevich, Vladimir Key Laboratory of Eco-chemical Engineering International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing College of Environment and Safety Engineering Qingdao University of Science and Technology Qingdao266042 China College of Chemistry and Molecular Engineering Qingdao University of Science and Technology Qingdao266042 China College of Environmental Science and Engineering Ocean University of China Qingdao266100 China V. Bakul Institute for Superhard Materials National Academy of Sciences of Ukraine Kyiv04074 Ukraine National Academy of Sciences of Ukraine Ukraine

Uranium as a crucial ingredient for nuclear reaction, has provided a risk to the environment and human safety due to its chemical toxicity and radioactivity. Monitoring and management of uranium contamination are of great significance for the rational utilization of uranium resources and the maintenance of the environment. Herein, we fabricated a novel fluorescent covalent organic framework (COF-AO) with multifunctional groups via facile Schiff base condensation and amidoximation reactions for selective uranium detection and extraction simultaneously. COF-AO featured a short adsorption equilibrium time of 45 min and a high saturated adsorption capacity of 229.9 mg/g, leading to a fast adsorption rate (5.1 mg g-1 min-1). Meanwhile, COF-AO demonstrated excellent uranium selectivity and an ultra-low fluorescence detection limit (14.6 nM). Furthermore, COF-AO displayed exceptional adsorption capacities in different natural water samples. Notably, the uranium extraction capacity of COF-AO from natural seawater was 16.0 mg/g in 28 days, indicating a high utilization rate of the COF-AO active sites in low-concentration solutions. Our work provides an effective strategy for designing fluorescent COF materials aimed at uranium detection and capture, which may be expanded to the detection and extraction of other pollutants through the rational design of specific ligands. © 2025, The Authors. All rights reserved.

关键词： Condensation reactions

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Comparison of the meat quality and fatty acid profile of muscles in finishing Xiangcun Black pigs fed varied dietary energy levels

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Animal Nutrition 2022年第4期11卷 15-24页

作者： Can Yang Wenlong Wang Xiaowu Tang Ruilin Huang Fengna Li Wenxuan Su Yulong Yin Chaoyue Wen Jian Liu College of Life Sciences and Environment Hunan Provincial Key Laboratory of Biological Resources Protection and Utilization in Nanyue Mountain AreaHengyang Normal UniversityHengyangHunan 421008China Key Laboratory of Agro-ecological Processes in Subtropical Region National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry ProductionInstitute of Subtropical AgricultureChinese Academy of ScienceChangsh1Hunan 410125China Hunan International Joint Laboratory of Animal Intestinal Ecology and Health Hunan Normal UniversityChangshaHunan 410081China College of Bioengineering Hunan Vocational Technical College of Environment and BiologyHengyangHunan 421005China Key Laboratory of Animal Feed and Nutrition of Zhejiang Province College of Animal SciencesZhejiang UniversityHangzhou 310058China Xiangcun High-technology Agricultural Co.LTD LoudiHunan 417000China

To study the effects of dietary energy level on the meat quality of different muscles in finishing pigs,400Xiangcun Black pigs(BW=79.55±4.77 kg)were randomly assigned to 5 treatments with varied calculated digestive energy(DE)at 3,050,3,100,3,150,3,200 and 3,250 kcal/kg,*** treatment had 8replicates with 10 pigs per *** quality,amino acid and fatty acid composition were tested in this *** differences in average daily gain,average daily feed intake or feed-to-gain ratio(P>0.05)were observed among dietary *** concentrations of longissimus dorsi(LD)muscle in DE3150was higher than those in other groups(P<0.05).The crude fat concentration of biceps femoris(BF)muscle in DE3250 tended to be higher than that in DE3150 and DE3100 groups(P<0.05).Pigs in DE3250 and DE3200 had higher fiber density and smaller cross-sectional area of BF muscle than those in DE3150(P<0.05).Pigs in DE3150 had the highest Cu concentration in LD muscle compared with those in DE3200,DE3250(P<0.05).The C16:1 proportion of LD muscle was lower(P<0.01)and C20:1 was higher(P<0.05)in DE3050 than that in the other dietary *** C18:3n6 and C20:3n6 proportions of BF muscle in DE3150 were higher than those in DE 3050,DE3200 and DE3250(P<0.05).For LD muscle,m RNA expressions of type I and IIa MyHC in group DE3150 were higher than other treatments(P<0.01).The LD muscle in DE3150 expressed higher PPARd than in other groups(P<0.01).Pigs in DE3100 expressed higher FOX1 than in DE3200 and DE3250(P<0.05).Sterol-regulatory element binding proteins(SREBPa)mRNA expression decreased linearly when dietary energy level increased in BF muscle(P<0.01).In conclusion,a200 kcal/kg decrease in digestible energy for 4 consecutive weeks did not affect growth performance of Xiangcun Black ***,LD and BF muscle respond differently to dietary energy level,and meat quality was improved by the medium energy level during the finishing phase.

关键词： Energy Growth performance Fatty acid Myofibrillar morphology Muscle

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