检索结果-南通市图书馆

超高效液相色谱-串联质谱法测定食品基质中21种食品添加剂

在线全文

学校读者我要写书评

暂无评论

食品科技 2024年第6期49卷 342-349页

作者：赵超群梁晶晶赵竟凯陶瑞刘柱浙江省食品药品检验研究院国家市场监管重点实验室(功能食品质量与安全)浙江省市场监督管理局重点实验室(保健食品质量安全重点实验室)浙江杭州310052

文章建立了超高效液相色谱-三重四级杆串联质谱法同时测定几种食品基质中21种食品添加剂的方法。样品经纯水及乙腈-甲醇-水溶液(V:V:V,1:1:1)振荡和超声提取后,取上清液,用超高效液相色谱-三重四级杆串联质谱在多反应监测下负离子模式... 详细信息

文章建立了超高效液相色谱-三重四级杆串联质谱法同时测定几种食品基质中21种食品添加剂的方法。样品经纯水及乙腈-甲醇-水溶液(V:V:V,1:1:1)振荡和超声提取后,取上清液,用超高效液相色谱-三重四级杆串联质谱在多反应监测下负离子模式分析检测。采用Waters Acquity UPLC HSS T_(3)柱(2.1 mm×100 mm,1.8μm)作为分析柱,梯度洗脱,外标法定量。结果显示:21种添加剂在质量浓度为4.9~771.2 ng/mL范围内线性关系良好,线性相关系数均大于等于0.9903,方法检出限为0.04~0.14 mg/kg,定量限为0.10~0.40 mg/kg;分别向空白样品中添加浓度为2倍、5倍、10倍定量限浓度的21种添加剂标准品,其平均加标回收率为69.2%~118.0%,相对标准偏差为0.59%~10.15%,仪器精密度相对标准偏差为0.68%~4.61%。建立的方法简单、快速,能广泛应用于不同食品基质中多种添加剂的分析检测。

关键词：添加剂食品基质超高效液相色谱-三重四级杆串联质谱检测

A novel approach for VOC source apportionment combining characteristic factor and pattern recognition technology in a Chinese industrial area

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第11期34卷 25-37页

作者： Deji Jing Nana Cheng Cheng Zhang Ziwei Chen Xingnong Cai Sujing Li jingkai zhao Qiaoli Wang Wei Li Key Laboratory of Biomass Chemical Engineering of the Ministry of Education Institute of Industrial Ecology and EnvironmentCollege of Chemical and Biological EngineeringZhejiang University(Yuquan Campus)Hangzhou 310027China College of Environment Zhejiang University of TechnologyHangzhou 310032China

Volatile organic compound(VOC) emission control and source apportionment in small-scale industrial areas have become key topics of air pollution control in China. This study proposed a novel characteristic factor and pattern recognition(CF-PR) model for VOC source apportionment based on the similarity of characteristic factors between sources and receptors.A simulation was carried out in a typical industrial area with the CF-PR model involving simulated receptor samples. Refined and accurate source profiles were constructed through in situ sampling and analysis, covering rubber, chemicals, coating, electronics, plastics, printing, incubation and medical treatment industries. Characteristic factors of n-undecane,styrene, o-xylene and propane were identified. The source apportionment simulation results indicated that the predicted contribution rate was basically consistent with the real contribution rate. Compared to traditional receptor models, this method achieves notable advantages in terms of refinement and timeliness at similar accuracy, which is more suitable for VOC source identification and apportionment in small-scale industrial areas.

关键词： VOC Source apportionment Characteristic factors Pattern recognition Industrial areas

A supplementary assessment system of AQI-V for comprehensive management and control of air quality in chemical industrial parks

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第8期130卷 114-125页

作者： Qiaoli Wang Dongping Sheng Chengzhi Wu Deji Jing Nana Cheng Xingnong Cai Sujing Li jingkai zhao Wei Li Jianmeng Chen College of Environment Zhejiang University of TechnologyHangzhou 310032China Key Laboratory of Biomass Chemical Engineering of the Ministry of Education Institute of Industrial Ecology and EnvironmentCollege of Chemical and Biological EngineeringZhejiang University(Yuquan Campus)Hangzhou 310027China Trinity Consultants Inc.(China office)Hangzhou 310012China Zhejiang Ocean University ZhoushanZhejiang Province 316022China

Volatile organic compounds(VOCs)are the dominant pollutants in industrial ***,they are not generally considered as part of the air quality index(AQI)system,which leads to a biased assessment of pollution in industrial *** this study,a supplementary assessment system of AQI-V was established by analyzing VOCs characteristics with vehicle-mounted PTR-TOFMS instrument,correlation analysis and the standards *** hourly and daily scenarios were considered,and the hierarchical parameter setting was further optimized by field *** hourly and daily assessments revealed the evaluation factors for the discriminability of different air quality levels,practiced value for regional air quality improvement,and the reservation of general dominant ***,the universality testing in ZPIP successfully recognized most of the peaks,with 54.76%,38.39%and 6.85%for O_(3),VOCs and NO_(2) as the dominant pollutant,and reflected the daily ambient air quality condition,togetherwith the dominant *** AQI-V systemwith VOCs sub-index is essential for air quality evaluation in industrial parks,which can further provide scientific support to control the pollution of VOCs and the secondary pollutant,therefore significantly improve the air quality in local industrial parks.

关键词： Air quality index Industrial parks,VOCs sub-index AQI-V system Scenario analysis

HTR-PM汽轮机轴封蒸汽断供原因分析及解决方案

在线全文

学校读者我要写书评

暂无评论

发电设备 2024年第3期38卷 161-164,171页

作者：叶林姚尧马喜强黄鹏王磊赵敬锴崔鹏华能山东石岛湾核电有限公司山东威海264312 西安热工研究院有限公司西安710051

介绍了高温气冷堆示范工程(HTR-PM)汽轮机轴封系统,并且对轴封蒸汽断供的原因进行了分析,提出了可以采用蒸汽发生器及管道内余汽供轴封、辅助电锅炉至轴封供汽管道改造、高温空气供轴封这3种解决方案。对3种方案进行对比,分析其在成本... 详细信息

介绍了高温气冷堆示范工程(HTR-PM)汽轮机轴封系统,并且对轴封蒸汽断供的原因进行了分析,提出了可以采用蒸汽发生器及管道内余汽供轴封、辅助电锅炉至轴封供汽管道改造、高温空气供轴封这3种解决方案。对3种方案进行对比,分析其在成本、可靠性和运行限制方面的优缺点,结果表明3种方案均是可行的。研究结果为HTR-PM汽轮机轴封蒸汽断供问题的解决提供了参考。

关键词：高温气冷堆轴封蒸汽断供余汽高温空气

The sudden ocean warming and its potential influences on earlyfrozen landfast ice in the Prydz Bay, East Antarctica

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2024年第5期43卷 65-77页

作者： Haihan Hu Jiechen zhao jingkai Ma Igor Bashmachnikov Natalia Gnatiuk Bo Xu Fengming Hui School of Geospatial Engineering and Science Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University) Ministry of EducationZhuhai 519082China Qingdao Innovation and Development Base(Centre)of Harbin Engineering University Qingdao 266500China Key Laboratory for Polar Acoustics and Application of Ministry of Education(Harbin Engineering University) Harbin 150001China Key Laboratory of Research on Marine Hazards Forecasting National Marine Environmental Forecasting CentreBeijing 100081China Nansen International Environmental and Remote Sensing Centre St.Petersburg 199034Russia Saint Petersburg State University St.Petersburg 199034Russia Antarctic Great Wall Ecology National Observation and Research Station Polar Research Institute of ChinaShanghai 201209China

The ocean conditions beneath the ice cover play a key role in understanding the sea ice mass balance in the polar *** integrated high-frequency ice-ocean observation system,including Acoustic Doppler Velocimeter,Conductivity-Temperature-Depth Sensor,and Sea Ice Mass Balance Array(SIMBA),was deployed in the landfast ice region close to the Chinese Zhongshan Station in Antarctica.A sudden ocean warming of 0.14℃(p<0.01)was observed beneath early-frozen landfast ice,from(−1.60±0.03)℃during April 16-19 to(−1.46±0.07)℃during April 20-23,2021,which is the only significant warming event in the nearly 8-month *** sudden ocean warming brought a double rise in oceanic heat flux,from(21.7±11.1)W/m^(2) during April 16-19 to(44.8±21.3)W/m^(2) during April 20-23,2021,which shifted the original growth phase at the ice bottom,leading to a 2 cm melting,as shown from SIMBA and borehole ***,the slowdown of ice bottom freezing decreased salt rejection,and the daily trend of observed ocean salinity changed from+0.02 d^(-1) during April 16-19,2021 to+0.003 d^(-1) during April 20-23,*** potential reasons are increased air temperature due to the transit cyclones and the weakened vertical ocean mixing due to the tide phase transformation from semi-diurnal to *** high-frequency observations within the ice-ocean boundary layer enhance the comprehensive investigation of the ocean’s influence on ice evolution at a daily scale.

关键词： sudden ocean warming oceanic heat flux landfast ice Zhongshan Station in-situ observation

胺碘酮与利多卡因治疗急性心肌梗死后室性心律失常的疗效分析

在线全文

学校读者我要写书评

暂无评论

中外医疗 2023年第6期42卷 140-143页

作者：刘畅赵靖凯吉林省人民医院急诊内科吉林长春130021 中国人民解放军93383部队医院内科黑龙江牡丹江157000

目的通过对胺碘酮和利多卡因治疗急性心肌梗死后室性心律失常的疗效分析,来为临床选择急性心肌梗死后室性心律失常患者治疗提供理论依据。方法方便选取2021年5—12月吉林省人民医院急诊内科接收的48例急性心肌梗死后室性心律失常患者... 详细信息

目的通过对胺碘酮和利多卡因治疗急性心肌梗死后室性心律失常的疗效分析,来为临床选择急性心肌梗死后室性心律失常患者治疗提供理论依据。方法方便选取2021年5—12月吉林省人民医院急诊内科接收的48例急性心肌梗死后室性心律失常患者为研究对象,随机分为对照组和观察组,各24例。对照组采用利多卡因治疗,观察组采用胺碘酮治疗。对比两组患者在不同给药下的治疗效果与不良反应的情况。结果观察组总有效率91.7%高于对照组62.5%,差异有统计学意义(χ^(2)=5.799,P=0.016)。观察组不良反应发生率8.3%低于对照组33.3%,差异有统计学意义(χ^(2)=4.547,P=0.033)。结论在急性心肌梗死后室性心律失常患者的治疗中,采用胺碘酮相比于利多卡因能够显著提升治疗总有效率,同时显著降低不良反应。

关键词：胺碘酮利多卡因急性心肌梗死室性心律失常疗效分析

维普期刊数据库博看期刊

“新业态”视角下电竞产业链的核心环节及政策应对

在线全文

学校读者我要写书评

暂无评论

河北体育学院学报 2022年第1期36卷 62-69页

作者：刘福元赵敬凯东北财经大学法学院辽宁大连116025

新冠肺炎疫情期间电子竞技产业的运行状况及增长速度,显示了以“线上线下相融合”为导向之一的“新业态”发展模式的积极效用。经过近年来的高速发展,电子竞技已经形成了复杂多元的产业链条,包括软件产业、竞赛表演产业、直播产业等13... 详细信息

新冠肺炎疫情期间电子竞技产业的运行状况及增长速度,显示了以“线上线下相融合”为导向之一的“新业态”发展模式的积极效用。经过近年来的高速发展,电子竞技已经形成了复杂多元的产业链条,包括软件产业、竞赛表演产业、直播产业等13个环节,其中竞技游戏/软件是各类赛事生成和运转的载体,而游戏本体的开发和制作既是电竞产业的基础和前提,亦是其核心所在。通过梳理各地方12部电竞专项文件中的政策措施可知,充分支持软件产业发展,分别优化“资金”“鼓励”和“保护”3类措施并形成系统性的政策集群,是改善电竞产业核心环节发展的合理应对方案。

关键词：新业态电子竞技产业链软件产业政策应对

甲苯、邻二甲苯和二氯甲烷混合气体降解菌群构建及其性能研究

在线全文

学校读者我要写书评

暂无评论

环境科学学报 2022年第10期42卷 193-201页

作者：凌文华郑江玲李云飞胡俊赵景开於建明浙江巴陵恒逸己内酰胺有限责任公司杭州311228 绍兴市生态环境局新昌分局绍兴312500 浙江天弈环境有限公司杭州310012 浙江工业大学环境学院杭州310014

挥发性有机物(VOCs)排放导致一系列环境问题,而生物法是一项绿色处理技术.本实验选取3种VOCs(甲苯、邻二甲苯、二氯甲烷)作为模型污染物,利用甲苯、邻二甲苯降解菌Zoogloea resiniphila HJ1(菌株HJ1)及二氯甲烷降解菌Methylobacterium r... 详细信息

挥发性有机物(VOCs)排放导致一系列环境问题,而生物法是一项绿色处理技术.本实验选取3种VOCs(甲苯、邻二甲苯、二氯甲烷)作为模型污染物,利用甲苯、邻二甲苯降解菌Zoogloea resiniphila HJ1(菌株HJ1)及二氯甲烷降解菌Methylobacterium rhodesianum H13(菌株H13)构建复合菌株,采用“专属菌+综合菌”模式以复合菌株和驯化污泥构建复合强化菌群.研究表明,复合菌株可完全降解400 mg·L^(-1)甲苯、256 mg·L^(-1)邻二甲苯、200 mg·L^(-1)二氯甲烷,矿化率分别为74.3%、61.1%、82.7%.复合菌株可完全降解480 mg·L^(-1)混合污染物(3种污染物浓度比为1∶1∶1),降解速率依次为甲苯>邻二甲苯>二氯甲烷.经过优化,菌株HJ1和菌株H13最佳配比被确定为1∶5.复合强化菌群不仅大幅提高了邻二甲苯、二氯甲烷降解速率,还提高了混合污染物矿化率.甲苯、邻二甲苯的存在对二氯甲烷降解产生明显抑制效应,而低浓度二氯甲烷(<240 mg·L^(-1))对甲苯、邻二甲苯降解无明显抑制作用.本研究为VOCs生物净化过程中菌群构建提供数据支撑.

关键词： Zoogloea resiniphila HJ1 Methylobacterium rhodesianum H13 复合强化菌群挥发性有机物矿化率

中国式现代化新征程中基本公共文化服务均等化建设探赜

在线全文

学校读者我要写书评

暂无评论

图书馆 2024年第2期 71-77页

作者：尚靖凯赵玲南京航空航天大学马克思主义学院南京211100

中国式现代化是物质文明和精神文明相协调的现代化,以基本公共文化服务均等化丰富人民精神世界是中国式现代化建设的内在要求。在中国式现代化新征程中,基本公共文化服务均等化建设应以普惠性服务为中国式现代化建设塑造全面发展的人、... 详细信息

中国式现代化是物质文明和精神文明相协调的现代化,以基本公共文化服务均等化丰富人民精神世界是中国式现代化建设的内在要求。在中国式现代化新征程中,基本公共文化服务均等化建设应以普惠性服务为中国式现代化建设塑造全面发展的人、以标准化服务为中国式现代化建设厚植文化民生根基、以数字化服务为中国式现代化建设探索融合发展方式、以引领性服务为中国式现代化建设凝聚持久精神动能。对此,文章提出的提升策略为强化多部门合作,形成基本公共文化服务均等化推进合力;细化财政投入机制,健全基本公共文化服务均等化保障体系;优化服务标准制定,强化标准化建设并提升服务均等化效度;深化数字赋能服务,创新基本公共文化服务均等化建设手段;优化服务项目内容,提高基本公共文化服务吸引力与引领力。

关键词：中国式现代化基本公共文化服务均等化共同富裕

同方期刊数据库