Polyurethane elastomers exhibit high dielectric constants owing to their polar groups,and can be used as energy storage capacitors.Energy storage depends not only on the dielectric constant but also on the dielectric ...Polyurethane elastomers exhibit high dielectric constants owing to their polar groups,and can be used as energy storage capacitors.Energy storage depends not only on the dielectric constant but also on the dielectric loss.However,the relationship between chain structure and dielectric properties is not yet clear.Ketal-containing crosslinked polyurethane elastomers were prepared using cyclic ketal diol as a chain extender.The effect of the soft segment length on the dielectric properties and energy storage was investigated.The cause of the change in the dipolar polarization with the soft segment length was analyzed.As the soft segment length increased,the hard-soft hydrogen bonding decreased,whereas the hard-hard hydrogen bonding increased.Under the action of an electric field,the polar bonds in the ketal-containing polyurethane elastomer overcome the hydrogen bonding between hard-soft segments to produce polarization;meanwhile,they also experience crankshaft motions to generate polarization.The former has a relatively high relaxation activation energy of approximately 10-20 k J·mol^(-1),resulting in a large dielectric loss.The latter has a relatively low relaxation activation energy,approximately 0.7-1.7 kJ·mol^(-1),leading to low dielectric loss.As a result,the dielectric constant showed a decreasing trend,and the dielectric loss gradually decreased.This study provides a theoretical foundation for improving the dielectric properties of polyurethane elastomers.展开更多
以果酒酵母为发酵剂,旨在优化茅根竹蔗酒精饮料的发酵工艺。基于单因素和响应面的工艺优化法,探究初始糖度、初始p H、酵母添加量、发酵温度及发酵时间对发酵产物酒精度和感官品质的影响。结果显示,茅根竹蔗酒精饮料的最佳发酵工艺参数...以果酒酵母为发酵剂,旨在优化茅根竹蔗酒精饮料的发酵工艺。基于单因素和响应面的工艺优化法,探究初始糖度、初始p H、酵母添加量、发酵温度及发酵时间对发酵产物酒精度和感官品质的影响。结果显示,茅根竹蔗酒精饮料的最佳发酵工艺参数为:初始糖度13.31°Brix、初始p H 3.8、酵母接种量0.16%,24℃发酵30 h.在此条件下制得的饮料酒精度为8%vol,感官评分达83分,口感清爽宜人。GC-MS分析共检出78种挥发性成分,其中醇类14种(相对含量29.22%)、酯类31种(相对含量21.93%)、酸类10种、酮类5种、醛类7种、醚类2种及其他9种,醇类和酯类为主要挥发性物质。此外,产品理化指标测定结果为:可溶性固形物含量8°Brix、p H 3.78、酒精度8%vol、总糖含量110 g/L、总酸含量0.29 g/L.综上,本研究探究了茅根竹蔗酒精饮料的优化工艺,并揭示了其风味物质组成,为该特色饮品的生产及品质提升提供了理论依据与技术支撑。展开更多
Ceramic-gel composite electrolytes(CGEs)attract significant attention as solid-state electrolytes(SSEs)for sodium metal batteries owing to their favorable ionic conductivity and interfacial compatibility.However,conve...Ceramic-gel composite electrolytes(CGEs)attract significant attention as solid-state electrolytes(SSEs)for sodium metal batteries owing to their favorable ionic conductivity and interfacial compatibility.However,conventional CGEs generally feature insufficient mechanical strength and consequent uncontrollable dendrite growth,remaining long-standing fundamental challenges that severely limit practical applications.Herein,this study presents a high-strength CGE that enables efficient stress transfer,achieving a compressive strength of 20.1 MPa(20 times higher than conventional gel electrolytes),while maintaining excellent ionic conductivity and effectively suppressing sodium dendrites.The 3D-Na_(3)Zr_(2)Si_(2)PO_(12)framework further serves as a thermal barrier,imparting the CGE with superior flame retardancy.Additionally,Na/CGE/NVP-K_(0.05)cells exhibit 75.9%capacity retention after 10,000 cycles at 5C(25℃)and deliver78.5 mAh g^(-1)at 30C(60℃).Remarkably,the CGE exhibits excellent low-temperature adaptability,retaining nearly 100% capacity at-20℃.These results highlight a viable strategy for designing safe and high-performance solid-state sodium metal batteries toward practical deployment.展开更多
In this study,the effects of low-dose sodium hypochlorite disinfection on water quality and biofilm growth in drinking water distribution systems(DWDS)after ultrafiltration pretreatment was investigated.The influence ...In this study,the effects of low-dose sodium hypochlorite disinfection on water quality and biofilm growth in drinking water distribution systems(DWDS)after ultrafiltration pretreatment was investigated.The influence of pipeline hydraulic residence time(HRT)on disinfection efficiency,by-product formation,microbial activity,and biofilm growth were considered.The results show that both microbial activities and metabolite secretion were stimulated by increasing HRT,aggravating the potential risk of microbial pollution in DWDS.The enhanced microbial metabolism could further weaken disinfection efficiency by consuming extra residual Chlorine,after which the formation of disinfection by-products was facilitated.Residual Chlorine was found negatively correlated with HRT.With prolonging HRT from 5 to 40 h,the concentration of disinfection by-products(Chlorate,Chlorite,and Trichloromethane)was on a continuously increasing trend by 37%,140%,and 75%,respectively.But the water kept in pipeline still reliably satisfied the Standards for drinking water quality in China(GB5749–2022).Besides,more biofilm with denser morphologies developed on rubber pipeline gaskets rather than the iron/plastic ones.Rubber material was inappropriate for DWDS due to its potential risk of secondary biological pollution.Prolonging HRT also enhanced the accumulation of dominant bacteria(e.g.Bradyrhizobium and Obscuribacter)and decreased microbial diversity.展开更多
Graph neural networks(GNN)have shown strong performance in node classification tasks,yet most existing models rely on uniform or shared weight aggregation,lacking flexibility in modeling the varying strength of relati...Graph neural networks(GNN)have shown strong performance in node classification tasks,yet most existing models rely on uniform or shared weight aggregation,lacking flexibility in modeling the varying strength of relationships among nodes.This paper proposes a novel graph coupling convolutional model that introduces an adaptive weighting mechanism to assign distinct importance to neighboring nodes based on their similarity to the central node.Unlike traditional methods,the proposed coupling strategy enhances the interpretability of node interactions while maintaining competitive classification performance.The model operates in the spatial domain,utilizing adjacency list structures for efficient convolution and addressing the limitations of weight sharing through a coupling-based similarity computation.Extensive experiments are conducted on five graph-structured datasets,including Cora,Citeseer,PubMed,Reddit,and BlogCatalog,as well as a custom topology dataset constructed from the Open University Learning Analytics Dataset(OULAD)educational platform.Results demonstrate that the proposed model achieves good classification accuracy,while significantly reducing training time through direct second-order neighbor fusion and data preprocessing.Moreover,analysis of neighborhood order reveals that considering third-order neighbors offers limited accuracy gains but introduces considerable computational overhead,confirming the efficiency of first-and second-order convolution in practical applications.Overall,the proposed graph coupling model offers a lightweight,interpretable,and effective framework for multi-label node classification in complex networks.展开更多
Abuse of chloramphenicol(CAP)could cause serious side effects to human health.Therefore,it is necessary to detect CAP residues in animal sourced food effectively.Here,the superiority(better stability,higher Apt-CAP lo...Abuse of chloramphenicol(CAP)could cause serious side effects to human health.Therefore,it is necessary to detect CAP residues in animal sourced food effectively.Here,the superiority(better stability,higher Apt-CAP loading efficiency,and higher CAP binding associated conformational change,etc.)of tetrahedral structure to double-chained structure for developing aptasensor was evaluated.Then,a self-assembled DNA tetrahedral structure-based electrochemical aptasensor targeting CAP was developed.Under the optimized conditions,the aptasensor exhibited high sensitivity toward CAP with a limit of detection(LOD)of 0.0676 ng/m L(linear range 0.19-387.76 ng/m L),and high selectivity against the structural analogs of CAP.Moreover,the recovery rate of CAP from spiked milk samples ranged from 100.57%to 101.69%,and only USD 1.34 is needed for detecting CAP in 1 sample.These results suggested the application potential of this aptasesor for detecting CAP in animal sourced foods.展开更多
Arrhythmias are a frequently occurring phenomenon in clinical practice,but how to accurately dis-tinguish subtle rhythm abnormalities remains an ongoing difficulty faced by the entire research community when conductin...Arrhythmias are a frequently occurring phenomenon in clinical practice,but how to accurately dis-tinguish subtle rhythm abnormalities remains an ongoing difficulty faced by the entire research community when conducting ECG-based studies.From a review of existing studies,two main factors appear to contribute to this problem:the uneven distribution of arrhythmia classes and the limited expressiveness of features learned by current models.To overcome these limitations,this study proposes a dual-path multimodal framework,termed DM-EHC(Dual-Path Multimodal ECG Heartbeat Classifier),for ECG-based heartbeat classification.The proposed framework links 1D ECG temporal features with 2D time–frequency features.By setting up the dual paths described above,the model can process more dimensions of feature information.The MIT-BIH arrhythmia database was selected as the baseline dataset for the experiments.Experimental results show that the proposed method outperforms single modalities and performs better for certain specific types of arrhythmias.The model achieved mean precision,recall,and F1 score of 95.14%,92.26%,and 93.65%,respectively.These results indicate that the framework is robust and has potential value in automated arrhythmia classification.展开更多
Tunable plasmonic structures provide the possibility to actively modify the radiation from atoms through electromagnetic coupling.In this paper,we investigate the decay and radiation behavior of an atom near a dielect...Tunable plasmonic structures provide the possibility to actively modify the radiation from atoms through electromagnetic coupling.In this paper,we investigate the decay and radiation behavior of an atom near a dielectric nanosphere with conductive surface within the framework of macroscopic quantum electrodynamics.The electromagnetic fields including the losses in the materials can be taken as fundamental excitations which interact with the atom through a transition dipole.Both weak and strong coupling regimes have been investigated.The decay rate and the angle-dependent light intensities indeed strongly depend on the parameters of the system,i.e.,the position and orientation of the dipole,the geometric size,and the surface conductivity,providing the opportunity of artificial control over these quantities.Generalizing the formalism in this paper to other systems,like metamaterials,is straightforward,which we believe may pave a way for future active quantum nanophotonic devices.展开更多
Objective:To explore the medication rule of Professor Ba Yuanming in the treatment of chronic glonerulonephritis by data mining technology,so as to provide certain reference for clinical and scientific research in the...Objective:To explore the medication rule of Professor Ba Yuanming in the treatment of chronic glonerulonephritis by data mining technology,so as to provide certain reference for clinical and scientific research in the treatment of Chronic glonerulonephritis with traditional Chinese medicine.Methods:collect,sort out and screen the cases of chronic nephritis diagnosed and treated by Professor Ba Yuanming in the outpatient department of Hubei Hospital of traditional Chinese medicine from 2018 to 2019,establish the database on the cloud platform of ancient and modern medical cases(v2.2.1),and use frequency statistics,association rules,hierarchical clustering and other analysis methods to study and analyze the drugs used.Results:1630 cases were included in the prescription,involving 212 traditional Chinese medicines.The high-frequency drugs are Poria cocos,astragalus,dangshen,yam,Chuanshanlong,Cornus,distracted wood,etc;the drugs are mainly warm,cold and calm;the five tastes are sweet and light,spicy and bitter;the meridian tropism is mostly found in the kidney,lung and spleen channels;the effects are calming the mind and the nerves,strengthening the spleen and stomach,promoting water and swelling,etc.The core Chinese medicine combinations of Astragalus and poria were obtained.Conclusion:Professor Ba Yuanming pays attention to comprehensive consideration,attack and supplement in the treatment of CGN,pays attention to the care of the healthy qi of Sanjiao,at the same time clearing away heat and dampness,removing blood stasis and firmness,and is good at using the sweet and gentle products.展开更多
基金financially supported by the Hubei Key Laboratory of Pollutant Analysis&Reuse Technology(No.PA230102)。
文摘Polyurethane elastomers exhibit high dielectric constants owing to their polar groups,and can be used as energy storage capacitors.Energy storage depends not only on the dielectric constant but also on the dielectric loss.However,the relationship between chain structure and dielectric properties is not yet clear.Ketal-containing crosslinked polyurethane elastomers were prepared using cyclic ketal diol as a chain extender.The effect of the soft segment length on the dielectric properties and energy storage was investigated.The cause of the change in the dipolar polarization with the soft segment length was analyzed.As the soft segment length increased,the hard-soft hydrogen bonding decreased,whereas the hard-hard hydrogen bonding increased.Under the action of an electric field,the polar bonds in the ketal-containing polyurethane elastomer overcome the hydrogen bonding between hard-soft segments to produce polarization;meanwhile,they also experience crankshaft motions to generate polarization.The former has a relatively high relaxation activation energy of approximately 10-20 k J·mol^(-1),resulting in a large dielectric loss.The latter has a relatively low relaxation activation energy,approximately 0.7-1.7 kJ·mol^(-1),leading to low dielectric loss.As a result,the dielectric constant showed a decreasing trend,and the dielectric loss gradually decreased.This study provides a theoretical foundation for improving the dielectric properties of polyurethane elastomers.
文摘以果酒酵母为发酵剂,旨在优化茅根竹蔗酒精饮料的发酵工艺。基于单因素和响应面的工艺优化法,探究初始糖度、初始p H、酵母添加量、发酵温度及发酵时间对发酵产物酒精度和感官品质的影响。结果显示,茅根竹蔗酒精饮料的最佳发酵工艺参数为:初始糖度13.31°Brix、初始p H 3.8、酵母接种量0.16%,24℃发酵30 h.在此条件下制得的饮料酒精度为8%vol,感官评分达83分,口感清爽宜人。GC-MS分析共检出78种挥发性成分,其中醇类14种(相对含量29.22%)、酯类31种(相对含量21.93%)、酸类10种、酮类5种、醛类7种、醚类2种及其他9种,醇类和酯类为主要挥发性物质。此外,产品理化指标测定结果为:可溶性固形物含量8°Brix、p H 3.78、酒精度8%vol、总糖含量110 g/L、总酸含量0.29 g/L.综上,本研究探究了茅根竹蔗酒精饮料的优化工艺,并揭示了其风味物质组成,为该特色饮品的生产及品质提升提供了理论依据与技术支撑。
基金the financial support from the National Natural Science Foundation of China(52072091 and 22479091)Heilongjiang Touyan Team and the Fundamental Research Funds for the Central Universities(Grant No.HIT.OCEF.2021015)the financial support from the China Scholarship Council(No.202406120138)。
文摘Ceramic-gel composite electrolytes(CGEs)attract significant attention as solid-state electrolytes(SSEs)for sodium metal batteries owing to their favorable ionic conductivity and interfacial compatibility.However,conventional CGEs generally feature insufficient mechanical strength and consequent uncontrollable dendrite growth,remaining long-standing fundamental challenges that severely limit practical applications.Herein,this study presents a high-strength CGE that enables efficient stress transfer,achieving a compressive strength of 20.1 MPa(20 times higher than conventional gel electrolytes),while maintaining excellent ionic conductivity and effectively suppressing sodium dendrites.The 3D-Na_(3)Zr_(2)Si_(2)PO_(12)framework further serves as a thermal barrier,imparting the CGE with superior flame retardancy.Additionally,Na/CGE/NVP-K_(0.05)cells exhibit 75.9%capacity retention after 10,000 cycles at 5C(25℃)and deliver78.5 mAh g^(-1)at 30C(60℃).Remarkably,the CGE exhibits excellent low-temperature adaptability,retaining nearly 100% capacity at-20℃.These results highlight a viable strategy for designing safe and high-performance solid-state sodium metal batteries toward practical deployment.
基金supported by the National Natural Science Foundation of China(Nos.52170070,52400022,and 52200088)the Youth S&T Talent Support Programme of Guangdong Provincial Association for Science and Technology(GDSTA)(No.SKXRC202406)+1 种基金the“One hundred Youth”Science and Technology Plan,Guangdong University of Technology,China(No.263113906)China Postdoctoral Science Foundation(No.2023M740754).
文摘In this study,the effects of low-dose sodium hypochlorite disinfection on water quality and biofilm growth in drinking water distribution systems(DWDS)after ultrafiltration pretreatment was investigated.The influence of pipeline hydraulic residence time(HRT)on disinfection efficiency,by-product formation,microbial activity,and biofilm growth were considered.The results show that both microbial activities and metabolite secretion were stimulated by increasing HRT,aggravating the potential risk of microbial pollution in DWDS.The enhanced microbial metabolism could further weaken disinfection efficiency by consuming extra residual Chlorine,after which the formation of disinfection by-products was facilitated.Residual Chlorine was found negatively correlated with HRT.With prolonging HRT from 5 to 40 h,the concentration of disinfection by-products(Chlorate,Chlorite,and Trichloromethane)was on a continuously increasing trend by 37%,140%,and 75%,respectively.But the water kept in pipeline still reliably satisfied the Standards for drinking water quality in China(GB5749–2022).Besides,more biofilm with denser morphologies developed on rubber pipeline gaskets rather than the iron/plastic ones.Rubber material was inappropriate for DWDS due to its potential risk of secondary biological pollution.Prolonging HRT also enhanced the accumulation of dominant bacteria(e.g.Bradyrhizobium and Obscuribacter)and decreased microbial diversity.
基金Support by Sichuan Science and Technology Program[2023YFSY0026,2023YFH0004]Guangzhou Huashang University[2024HSZD01,HS2023JYSZH01].
文摘Graph neural networks(GNN)have shown strong performance in node classification tasks,yet most existing models rely on uniform or shared weight aggregation,lacking flexibility in modeling the varying strength of relationships among nodes.This paper proposes a novel graph coupling convolutional model that introduces an adaptive weighting mechanism to assign distinct importance to neighboring nodes based on their similarity to the central node.Unlike traditional methods,the proposed coupling strategy enhances the interpretability of node interactions while maintaining competitive classification performance.The model operates in the spatial domain,utilizing adjacency list structures for efficient convolution and addressing the limitations of weight sharing through a coupling-based similarity computation.Extensive experiments are conducted on five graph-structured datasets,including Cora,Citeseer,PubMed,Reddit,and BlogCatalog,as well as a custom topology dataset constructed from the Open University Learning Analytics Dataset(OULAD)educational platform.Results demonstrate that the proposed model achieves good classification accuracy,while significantly reducing training time through direct second-order neighbor fusion and data preprocessing.Moreover,analysis of neighborhood order reveals that considering third-order neighbors offers limited accuracy gains but introduces considerable computational overhead,confirming the efficiency of first-and second-order convolution in practical applications.Overall,the proposed graph coupling model offers a lightweight,interpretable,and effective framework for multi-label node classification in complex networks.
基金supported by the National Nature Science Foundation of China(82174531)the Medicine and Health Science Technology Development Project of Shandong Province,China(202212060626).
文摘Abuse of chloramphenicol(CAP)could cause serious side effects to human health.Therefore,it is necessary to detect CAP residues in animal sourced food effectively.Here,the superiority(better stability,higher Apt-CAP loading efficiency,and higher CAP binding associated conformational change,etc.)of tetrahedral structure to double-chained structure for developing aptasensor was evaluated.Then,a self-assembled DNA tetrahedral structure-based electrochemical aptasensor targeting CAP was developed.Under the optimized conditions,the aptasensor exhibited high sensitivity toward CAP with a limit of detection(LOD)of 0.0676 ng/m L(linear range 0.19-387.76 ng/m L),and high selectivity against the structural analogs of CAP.Moreover,the recovery rate of CAP from spiked milk samples ranged from 100.57%to 101.69%,and only USD 1.34 is needed for detecting CAP in 1 sample.These results suggested the application potential of this aptasesor for detecting CAP in animal sourced foods.
基金supported by the Innovative Human Resource Development for Local Intel-lectualization program through the Institute of Information&Communications Technology Planning&Evaluation(IITP)grant funded by the Korea government(MSIT)(No.IITP-2026-2020-0-01741)the research fund of Hanyang University(HY-2025-1110).
文摘Arrhythmias are a frequently occurring phenomenon in clinical practice,but how to accurately dis-tinguish subtle rhythm abnormalities remains an ongoing difficulty faced by the entire research community when conducting ECG-based studies.From a review of existing studies,two main factors appear to contribute to this problem:the uneven distribution of arrhythmia classes and the limited expressiveness of features learned by current models.To overcome these limitations,this study proposes a dual-path multimodal framework,termed DM-EHC(Dual-Path Multimodal ECG Heartbeat Classifier),for ECG-based heartbeat classification.The proposed framework links 1D ECG temporal features with 2D time–frequency features.By setting up the dual paths described above,the model can process more dimensions of feature information.The MIT-BIH arrhythmia database was selected as the baseline dataset for the experiments.Experimental results show that the proposed method outperforms single modalities and performs better for certain specific types of arrhythmias.The model achieved mean precision,recall,and F1 score of 95.14%,92.26%,and 93.65%,respectively.These results indicate that the framework is robust and has potential value in automated arrhythmia classification.
基金supported by Hangzhou Dianzi University(Grant No.KYS075621018)supported by the Natural Science Foundation of Zhejiang Province(Grant No.LY24A050004)。
文摘Tunable plasmonic structures provide the possibility to actively modify the radiation from atoms through electromagnetic coupling.In this paper,we investigate the decay and radiation behavior of an atom near a dielectric nanosphere with conductive surface within the framework of macroscopic quantum electrodynamics.The electromagnetic fields including the losses in the materials can be taken as fundamental excitations which interact with the atom through a transition dipole.Both weak and strong coupling regimes have been investigated.The decay rate and the angle-dependent light intensities indeed strongly depend on the parameters of the system,i.e.,the position and orientation of the dipole,the geometric size,and the surface conductivity,providing the opportunity of artificial control over these quantities.Generalizing the formalism in this paper to other systems,like metamaterials,is straightforward,which we believe may pave a way for future active quantum nanophotonic devices.
基金The third project of famous TCM masters in Hubei Province(No.[2018]15)Chinese medicine studio of Bayuanming in Hubei Province(No.[2019]18)The Sixth Batch of national old Chinese medicine experts'academic experience inheritance Guidance Teacher Project(No.[2017]29)。
文摘Objective:To explore the medication rule of Professor Ba Yuanming in the treatment of chronic glonerulonephritis by data mining technology,so as to provide certain reference for clinical and scientific research in the treatment of Chronic glonerulonephritis with traditional Chinese medicine.Methods:collect,sort out and screen the cases of chronic nephritis diagnosed and treated by Professor Ba Yuanming in the outpatient department of Hubei Hospital of traditional Chinese medicine from 2018 to 2019,establish the database on the cloud platform of ancient and modern medical cases(v2.2.1),and use frequency statistics,association rules,hierarchical clustering and other analysis methods to study and analyze the drugs used.Results:1630 cases were included in the prescription,involving 212 traditional Chinese medicines.The high-frequency drugs are Poria cocos,astragalus,dangshen,yam,Chuanshanlong,Cornus,distracted wood,etc;the drugs are mainly warm,cold and calm;the five tastes are sweet and light,spicy and bitter;the meridian tropism is mostly found in the kidney,lung and spleen channels;the effects are calming the mind and the nerves,strengthening the spleen and stomach,promoting water and swelling,etc.The core Chinese medicine combinations of Astragalus and poria were obtained.Conclusion:Professor Ba Yuanming pays attention to comprehensive consideration,attack and supplement in the treatment of CGN,pays attention to the care of the healthy qi of Sanjiao,at the same time clearing away heat and dampness,removing blood stasis and firmness,and is good at using the sweet and gentle products.
