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On-Site Assessment of a Cryogenic Disinfectant for the Alpine Environment and Outer Packaging of Frozen Items

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Biomedical and Environmental Sciences 2023年第2期36卷 174-184页

作者： SHEN Jin YANG Bin XIAO Jia Qing LI Lu Yao SUN Hui Hui DUAN Hong Yang zhang Wei LIANG Chen CHEN Lu LI Li CHEN Yan Yan LYU Yuan TANG Song WANG Jiao zhang liu bo WANG Lin National Institute of Environment Health Chinese Center for Disease Control and PreventionBeijing 100021China Shandong Provincial Center for Disease Control and Prevention Jinan 250013ShandongChina Heilongjiang Provincial Center for Disease Control and Prevention Harbin 150030HeilongjiangChina

Objective To study the effectiveness and feasibility of cryogenic disinfectants in different cold scenarios and analyze the key points of on-site cryogenic disinfection.Methods Qingdao and Suifenhe were selected as application sites for the manual or mechanical spraying of cryogenic disinfectants.The same amount of disinfectant(3,000 mg/L)was applied on cold chain food packaging,cold chain containers,transport vehicles,alpine environments,and article surfaces.The killing log value of the cryogenic disinfectant against the indicator microorganisms(Staphylococcus aureus and Escherichia coli)was used to evaluate the on-site disinfection effect.Results When using 3,000 mg/L with an action time of 10 min on the ground in alpine regions,the surface of frozen items,cold-chain containers,and cold chain food packaging in supermarkets,all external surfaces were successfully disinfected,with a pass rate of 100%.The disinfection pass rates for cold chain food packaging and cold chain transport vehicles of centralized supervised warehouses and food processing enterprises were 12.5%(15/120),81.67%(49/60),and 93.33%(14/15),respectively;yet,the surfaces were not fully sprayed.Conclusion Cryogenic disinfectants are effective in disinfecting alpine environments and the outer packaging of frozen items.The application of cryogenic disinfectants should be regulated to ensure that they cover all surfaces of the disinfected object,thus ensuring effective cryogenic disinfection.

关键词： Cryogenic disinfectant COVID-19 An alpine environment Disinfection Outer packaging of frozen items

Effects of Multiple Cleaning and Disinfection Interventions on Infectious Diseases in Children: A Group Randomized Trial in China

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Biomedical and Environmental Sciences 2015年第11期28卷 779-787页

作者： BAN Hai Qun LI Tao SHEN Jin LI Jin PENG Pin zhang YE Heng Ping zhang liu bo Institute of Environment Health and Related Product Safety Center for Disease Control and Prevention of China Center for Disease Control and Prevention of Xiantao city

Objective To assess the effectiveness of multiple cleaning and disinfection interventions in the homes and kindergartens, in reducing gastrointestinal and respiratory illnesses of children. Methods From October 2010 to September 2011, we performed a prospective, controlled study in China. 408 children under 5 years old were recruited and group randomized into intervention and control groups. Families and kindergartens in the intervention group were provided with antibacterial products for hand hygiene and surface cleaning or disinfection for one year. Each child＇s illness symptoms and sick leave were recorded every day. Results A total of 393 children completed the study, with similar baseline demographics in each of the 2 groups. Except for abdominal pain, the odds of symptoms （fever, cough and expectoration, runny nose and nasal congestion, diarrhea）, illness （acute respiratory illness and gastrointestinal illness）, and sick leave per person each month were significantly reduced by interventions. The rates of fever, diarrhea, acute respiratory illness, gastrointestinal illness and sick leave per person per year were significantly decreased as well. Conclusion Not only the acute respiratory children were significantly reduced by multiple and gastrointestinal illness but the sick leave rate in interventions.

关键词： Communicable disease control Child daycare centers Sick leave Antibacterial agents Hand hygiene Domestic hygiene Surface cleaning Surface disinfection

聚六亚甲基双胍盐酸盐消毒剂长效消毒效果评价的试验研究

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中国消毒学杂志 2024年第4期41卷 256-258页

作者：张琪李涛王妍彦张流波中国疾病预防控制中心环境与健康相关产品安全所北京100021 传染病溯源预警与智能决策全国重点实验室中国疾病预防控制中心环境与人群健康重点实验室

目的评价聚六亚甲基双胍盐酸盐消毒剂的长效消毒效果,为我国消毒剂长效消毒效果评价方法的建立提供参考依据。方法参考英国标准PAS 2424的评价方法,观察不同浓度消毒剂样品对细菌繁殖体及致病性酵母菌的杀灭效果。结果此消毒剂样品对于... 详细信息

目的评价聚六亚甲基双胍盐酸盐消毒剂的长效消毒效果,为我国消毒剂长效消毒效果评价方法的建立提供参考依据。方法参考英国标准PAS 2424的评价方法,观察不同浓度消毒剂样品对细菌繁殖体及致病性酵母菌的杀灭效果。结果此消毒剂样品对于大肠埃希菌的长效消毒效果最好,对于金黄色葡萄球菌和铜绿假单胞菌的长效消毒效果次之,对于白念珠菌的长效消毒效果最差,差异具有统计学意义(P<0.05)。结论聚六亚甲基双胍盐酸盐消毒剂样品对于大肠埃希菌和金黄色葡萄球菌具有24 h长效消毒效果。

关键词：聚六亚甲基双胍盐酸盐长效消毒物体表面效果评价

Microbial Presence on Kitchen Dishcloths in Chinese Housholds

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Biomedical and Environmental Sciences 2014年第12期27卷 978-981页

作者： SHEN Jin ZHAO Bin Xiu LI Tao BAN Hai Qun TIAN Liang GE Yi Lin CHEN Tai Yao LI Shi Yue zhang liu bo School of Public Health Wuhan University Institute of Environment Health and Related Product Safety Center for Disease Control and Prevention of China Center for Disease Control and Prevention of Shanghai

To study the microbiological contamination of kitchen dishcloths in Chinese housholds, 1010 ＇in-use＇ kitchen dishcloths were collected from residential premises in Beijing and Shanghai, and they were sent to the lab... 详细信息

关键词： Microbial Presence on Kitchen Dishcloths in Chinese Housholds

一种光催化消毒机的消毒效果及其影响因素研究

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中国消毒学杂志 2024年第6期41卷 401-403,407页

作者：王妍彦张宝莹张流波沈瑾中国疾病预防控制中心环境与健康相关产品安全所北京100021

目的研究一种光催化消毒机在试验条件下对气雾室内空气和物体表面的消毒效果及影响因素。方法采用空气消毒模拟现场试验和载体定量杀灭试验方法,观察某光催化消毒机对气雾室空气、布片及平板载体的消毒效果;采用平板染菌比较各组菌落数... 详细信息

目的研究一种光催化消毒机在试验条件下对气雾室内空气和物体表面的消毒效果及影响因素。方法采用空气消毒模拟现场试验和载体定量杀灭试验方法,观察某光催化消毒机对气雾室空气、布片及平板载体的消毒效果;采用平板染菌比较各组菌落数方法,探索空气中是否有消毒因子产生。结果该光催化消毒机主要消毒因子为二氧化钛,并辅以铑和银等金属作为光催化剂,在宽光谱紫外线照射和循环风条件下,作用30min对空气中白色葡萄球菌杀灭率达99.90%以上。提高循环风量,作用2h对布片上的金黄色葡萄球菌杀灭率为38.36%,未达到消毒效果;作用4、6和8 h对平板上的金黄色葡萄球菌杀灭率分别为93.17%、95.36%和97.06%。结论该光催化消毒机对气雾室内空气有较好的消毒效果,消毒效率与循环风量正相关。

关键词：光催化剂紫外线空气消毒消毒效果

A novel graph oversampling framework for node classification in class-imbalanced graphs

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Science China(Information Sciences) 2024年第6期67卷 214-229页

作者： Riting XIA Chunxu zhang Yan zhang Xueyan liu bo YANG Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University College of Artificial Intelligence Jilin University College of Computer Science and Technology Jilin University College of Communication Engineering Jilin University

Graph neural network(GNN) is a promising method to analyze graphs. Most existing GNNs adopt the class-balanced assumption, which cannot deal with class-imbalanced graphs well. The oversampling technique is effective in alleviating class-imbalanced problems. However, most graph oversampling methods generate synthetic minority nodes and their edges after applying GNNs. They ignore the problem that the representations of the original and synthetic minority nodes are dominated by majority nodes caused by aggregating neighbor information through GNN before oversampling. In this paper, we propose a novel graph oversampling framework, termed distribution alignment-based oversampling for node classification in classimbalanced graphs(named Graph-DAO). Our framework generates synthetic minority nodes before GNN to avoid the dominance of majority nodes caused by message passing in GNNs. Additionally, we introduce a distribution alignment method based on the sum-product network to learn more information about minority nodes. To our best knowledge, it is the first to use the sum-product network to solve the class-imbalanced problem in node classification. A large number of experiments on four real datasets show that our method achieves the optimal results on the node classification task for class-imbalanced graphs.

关键词： graph neural network class-imbalanced graphs sum-product network oversampling node classification

Tracking Regulatory Mechanism of Trace Fe on Graphene Electromagnetic Wave Absorption

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Nano-Micro Letters 2024年第4期16卷 79-96页

作者： Kaili zhang Yuhao liu Yanan liu Yuefeng Yan Guansheng Ma bo Zhong Renchao Che Xiaoxiao Huang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001People’s Republic of China MIIT Key Laboratory of Advanced Structural‑Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001People’s Republic of China School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438People’s Republic of China

Polarization and conductance losses are the fundamental dielectric attenuation mechanisms for graphene-based absorbers, but it is not fully understood in revealing the loss mechanism of affect graphene itself. For the first time, the reduced graphene oxide(RGO) based absorbers are developed with regulatory absorption properties and the absorption mechanism of RGO is mainly originated from the carrier injection behavior of trace metal Fe nanosheets on graphene. Accordingly, the minimum reflection loss(RLmin) of Fe/RGO-2composite reaches-53.38 dB(2.45 mm), and the effective absorption bandwidth achieves 7.52 GHz(2.62 mm) with lower filling loading of 2 wt%. Using off-axis electron hologram testing combined with simulation calculation and carrier transport property experiments, we demonstrate here the carrier injection behavior from Fe to graphene at the interface and the induced charge accumulation and rearrangement, resulting in the increased interfacial and dipole polarization and the conductance loss. This work has confirmed that regulating the dielectric property of graphene itself by adding trace metals can not only ensure good impedance matching, but also fully exploit the dielectric loss ability of graphene at low filler content,which opens up an efficient way for designing lightweight absorbers and may be extended to other types materials.

关键词： Reduced graphene oxide Fe nanosheets Dielectric loss Electromagnetic wave absorption

Investigating the effect of volatility on the hygroscopicities of acetate nanoparticle aerosols by surface plasmon resonance microscopy

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Journal of Environmental Sciences 2024年第4期138卷 167-178页

作者： bo Yang Zhibo Xie Jianguo liu Huaqiao Gui Jiaoshi zhang Xiuli Wei Zetao Fan Douguo zhang Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Advanced Laser Technology Laboratory of Anhui Province Department of Optics and Optical EngineeringUniversity of Science and Technology of ChinaHefei 230026China

Under high relative humidity(RH)conditions,the release of volatile components(such as acetate)has a significant impact on the aerosol hygroscopicity.In this work,one surface plasmon resonance microscopy(SPRM)measurement system was introduced to determine the hygroscopic growth factors(GFs)of three acetate aerosols separately or mixed with glucose at different RHs.For Ca(CH_(3)COO)_(2) or Mg(CH_(3)COO)_(2) aerosols,the hygroscopic growth trend of each time was lower than that of the previous time in three cyclic humidification from 70% RH to 90% RH,which may be due to the volatility of acetic acid leading to the formation of insoluble hydroxide(Ca(OH)_(2) or Mg(OH)_(2))under high RH conditions.Then the third calculated GF(using the Zdanovskii-Stokes-Robinson method)for Ca(CH_(3)COO)_(2) or Mg(CH_(3)COO)_(2) in bicomponent aerosols with 1:1 mass ratio were 3.20% or 5.33% lower than that of the first calculated GF at 90% RH.The calculated results also showed that the hygroscopicity change of bicomponent aerosol was negatively correlated with glucose content,especially when the mass ratio of Mg(CH_(3)COO)_(2) to glucose was 1:2,the GF at 90% RH only decreased by4.67% after three cyclic humidification.Inductively coupled plasma atomic emission spectrum(ICP-AES)based measurements also indicated that the changes of Mg^(2+)concentration in bicomponent was lower than that of the single-component.The results of this study reveal thatduring the efflorescence transitions of atmospheric nanoparticles,the organic acids diffusion rate may be inhibited by the coating effect of neutral organic components,and the particles aging cycle will be prolonged.

关键词： Hygroscopic growth Volatility Acetate aerosols Nanoparticle aerosol Surface plasmon resonance

Recovery of cyanophycin granule polypeptide from activated sludge: carbon source dependence and aggregation-induced luminescence characteristics

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 25-34页

作者： Kui Zou Hongyuan liu bo Feng Taiping Qing Peng zhang College of Environment and Resources Xiangtan UniversityXiangtan 411105China

In the sewage treatment process,facilitating the conversion of pollutants into value-added resources holds great potential for reducing the amount of greenhouse gas emissions and promoting economic circulation.Cyanophycin granule polypeptide(CGP),a recently discovered high value-added biopolymer present in activated sludge,has provided new avenues for the recovery of resources.However,the mechanisms that regulate CGP synthesis and the characteristics of this biopolymer in activated sludge remain unclear thus far.This study investigated the synthesis of CGP,polyhydroxyalkanoates(PHA),and alginate-like exopolysaccharides(ALE)in various microbial aggregates under different carbon sources feeding conditions.Our results showed that the CGP yields was superior that of PHA and ALE when subjected to identical carbon source feeding conditions.Furthermore,biofilm was more conducive to CGP accumulation than floc sludge.Compared with glucose and methanol,sodium acetate significantly enriched the CGP synthetase-encoding gene(cphAabundance=~17419),resulting in the highest CGP yield(average 107.1 mg/g MLSS)in both biofilm and floc sludge.This study is the first to reported the characteristic fluorescence of CGP(Ex/Em=~360/450 nm)caused by the aggregated luminescence of arginine on the side chains.Overall,this study highlights the potential application of CGP as a fluorescent material and offers insights into CGP recovery from activated sludge in wastewater treatment plants.

关键词： Cyanophycin Polyhydroxyalkanoate Alginate-like exopolysaccharides Bioresource recovery Aggregation-induced luminescence