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Evaluation of the secondary structures of protein in the extracellular polymeric substances extracted from activated sludge by different methods

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Journal of Environmental Sciences 2019年第6期31卷 128-136页

作者： benyi xiao Yu Liu Meng Luo Tang Yang Xuesong Guo Hao Yi Research Center for Eco-Environmental Sciences Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing ZEHO Waterfront Ecological Environment Treatment Company South China Institute of Environmental Sciences Ministry of Environmental Protection

The changes of protein secondary structures in the extracellular polymeric substances(EPS) extracted from activated sludge by four different methods were studied by analyzing the amide I region(1700–1600 cm-1) of the Fourier transform infrared spectra and model protein test. The results showed the molecular weight distribution of organic matter extracted by centrifugation, heating and cation exchange resin(CER) was similar, while the EPS extracted by centrifugation(Control) and CER had similar fluorescent organic matter. The protein secondary structures of extracted EPS by the four methods were different. The similarities of protein secondary structures between the EPS extracted by CER with the Control were the highest among the four extracted EPS. Although the EPS yield extracted by formaldehyde + NaOH method were the highest, its protein secondary structures had the lowest similarity with those extracted by the Control. Additionally, the effects of centrifugation and CER extraction on the secondary structures of bovine serum albumin were also lower than that of other extraction processes. CER enables the second maximum extraction of EPS and maximum retention of the original secondary structure of proteins.

关键词： Activated sludge Different extraction methods Extracellular polymeric substances Protein secondary structure

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新型吸声复合板材的设计与验证

计量科学与技术 2024年第3期68卷 58-61,74页

作者：罗奔毅广州计量检测技术研究院广州510663

为了解决实验室环境噪音过大的问题,研究开发了一种新型吸声复合板材。板材为穿孔板-三聚氰胺泡沫-沥青阻尼层-离心玻璃棉-刚性背衬(内含骨架)的复合结构,在100~5000Hz频率段内具有不低于0.6的吸声系数。首先引入Biot理论建立了声波随... 详细信息

为了解决实验室环境噪音过大的问题,研究开发了一种新型吸声复合板材。板材为穿孔板-三聚氰胺泡沫-沥青阻尼层-离心玻璃棉-刚性背衬(内含骨架)的复合结构,在100~5000Hz频率段内具有不低于0.6的吸声系数。首先引入Biot理论建立了声波随机入射情况下复合板材传声特性模型,并通过有限元实现了仿真结果的运算。继而将试做的样品放置在混响室内测试吸声系数。测试结果与仿真结果趋势一致,证实了模型的可行性。最后将吸声复合板应用到广州计量检测技术研究院热工实验室的环境噪声整治工程中,成功将室内噪声A计权声压级由79.8dB降低至64.1dB,再次证实了新型吸声复合板材的高吸声性。

关键词：计量学随机入射吸声系数三聚氰胺龙骨架传声特性模型

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热电厂磁悬浮鼓风机控制系统的设计

中国造纸 2024年第5期43卷 158-164页

作者：刘皓月杨波李哲睿王本义安然中车大连机车研究所有限公司辽宁大连116000

本研究以热电厂脱硫氧化工艺流程中的200 kW磁悬浮鼓风机为研究对象,设计了一种自动控制系统。该系统可以实现对磁悬浮鼓风机的精准控制和远程实时监控,自动调节鼓风机的转速以及风量,并能够自动检测鼓风机的故障并及时报警,从而提高了... 详细信息

本研究以热电厂脱硫氧化工艺流程中的200 kW磁悬浮鼓风机为研究对象,设计了一种自动控制系统。该系统可以实现对磁悬浮鼓风机的精准控制和远程实时监控,自动调节鼓风机的转速以及风量,并能够自动检测鼓风机的故障并及时报警,从而提高了设备的控制精度和生产效率,减少了人工干预对设备运行的影响,增强了设备的稳定性和安全性。

关键词：热电厂脱硫氧化磁悬浮鼓风机自动控制系统

椎板切除减压术中体感诱发电位预测模型的建立

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中国临床研究 2024年第5期37卷 724-728,734页

作者：汪红亮周涛王璐查本义周捷马鞍山市人民医院安徽医科大学马鞍山临床学院安徽马鞍山243000 安徽工业大学机械工程学院安徽马鞍山243000

目的探讨影响椎板切除减压术中体感诱发电位(SEP)的因素,并建立预测模型。方法回顾性分析2021年1月至2023年1月于马鞍山市人民医院脊柱骨科行椎板切除减压术的120例脊柱椎管狭窄患者的SEP监测资料。根据有无发生SEP信号改变将患者分为SE... 详细信息

目的探讨影响椎板切除减压术中体感诱发电位(SEP)的因素,并建立预测模型。方法回顾性分析2021年1月至2023年1月于马鞍山市人民医院脊柱骨科行椎板切除减压术的120例脊柱椎管狭窄患者的SEP监测资料。根据有无发生SEP信号改变将患者分为SEP改变组(n=21)和对照组(n=91)。采用Lasso回归、交叉验证法、单因素及多因素logistic回归分析确定预测因素。绘制预测SEP改变的列线图,并使用受试者工作特征(ROC)曲线、校准曲线及临床决策曲线来对模型进行评估。结果多因素logistic回归分析显示,超重、出血量、体温、电刀使用情况是影响SEP的独立影响因素,差异有统计学意义(P<0.05)。在模型的验证中,列线图的AUC为0.914,说明模型具有良好的区分度。最优校准曲线显示预测值和实际值具有良好的一致性。临床决策曲线显示模型具有良好的临床实用性。结论超重、出血量、体温、电刀使用情况是SEP变化的影响因素,建立预测SEP变化的列线图,使脊柱科医师能采取有效的预防治疗措施,增加神经电生理监测的准确性。

关键词：体感诱发电位椎板切除减压术列线图超重出血量体温神经电生理

Simultaneous removal of Pb and MTBE by mixed zeolites in fixed-bed column tests

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Journal of Environmental Sciences 2022年第12期34卷 41-49页

作者： Yunhui Zhang FeiWang benyi Cao Hailong Yin Abir Al-Tabbaa College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Key Laboratory of Yangtze River Water Environment Ministry of EducationTongji UniversityShanghai 200092China Department of Engineering University of CambridgeCambridgeCB21PZUK Institute of Geotechnical Engineering School of TransportationSoutheast UniversityNanjing 210096China State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control Nanjing Institute of Environmental SciencesMinistry of Ecology and Environment of ChinaNanjing 210042China

The co-contamination of metals and organic pollutants,such as Pb and methyl tert-butyl ether(MTBE),in groundwater,has become a common and major phenomenon in many contaminated sites.This study evaluated the feasibility of their simultaneous removal with permeable reactive barrier(PRB)packed with mixed zeolites(clinoptilolite and ZSM-5)using fixed-bed column tests and breakthrough curve modeling.The effect of grain size on the permeability of PRB and removal efficacy was also assessed by granular and power clinoptilolite.The replacement of granular clinoptilolite by powder clinoptilolite largely reduced the breakthrough time but increased the saturation time nearly fourfold.The column adsorption capacity of clinoptilolite powders almost tripled that of clinoptilolite granules(130.6mg/g versus 45.3 mg/g)due to higher specific surface areas.The minimum thickness and corresponding longevity of PRB were calculated as 7.12 cm and 321.5 min when 5%of granular clinoptilolite was mixed with 5%ZSM-5 and 90%sand as mixed PRB reactive media compared with 10.86 cm and 1230.2 min for the application of powder clinoptilolite.This study is expected to provide theoretical support and guidance for the practical application of mixed adsorbents in PRBs.

关键词： MTBE Zeolite Heavy metal Permeable reactive barrier Groundwater remediation

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磁悬浮鼓风机在火力发电行业的应用

机电工程技术 2024年第5期53卷 298-301页

作者：王本义安然李瑜中车大连机车研究所有限公司辽宁大连116021

针对火力发电行业脱硫氧化风机噪声大、能耗高、维修工作强度大以及成本高等问题,分析了磁悬浮鼓风机在火力发电行业脱硫氧化工艺中的应用可行性,通过对比现有的氧化风机的特点、性能及维护性,发现磁悬浮鼓风机在火力发电中的脱硫氧化... 详细信息

针对火力发电行业脱硫氧化风机噪声大、能耗高、维修工作强度大以及成本高等问题,分析了磁悬浮鼓风机在火力发电行业脱硫氧化工艺中的应用可行性,通过对比现有的氧化风机的特点、性能及维护性,发现磁悬浮鼓风机在火力发电中的脱硫氧化过程中具有节能优势、噪声优势、日常维护优势以及智能控制的优势。在磁悬浮鼓风机替代传统氧化风机的应用案例中,磁悬浮鼓风机较单级离心鼓风机在同风量下节能20.1%,噪声降低19 dB (A计权),在同工艺效果下节能32.5%,噪声降低22 dB (A计权),同时实现了智能控制和无人值守,降低了劳动强度,提升了火力发电的能效,减少污染排放,从而促进火力发电行业的可持续发展。该技术的应用为火力发电行业节能降碳提供了创新的技术解决方案。

关键词：磁悬浮鼓风机火力发电脱硫氧化工艺节能

维普期刊数据库博看期刊

Effects of various pretreatments on biohydrogen production from sewage sludge

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Chinese Science Bulletin 2009年第12期54卷 2038-2044页

作者： xiao benyi LIU JunXin Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

The sewage sludge of wastewater treatment plant is a kind of biomass which contains many organics, mainly carbohydrates and proteins. Four pretreatments, acid pretreatment, alkaline pretreatment, thermal pretreatment and ultrasonic pretreatment, were used to enhance biohydrogen production from sewage sludge. The experimental results showed that the four pretreatments could all increase the soluble chemical oxygen demand (SCOD) of sludge and decrease the dry solid (DS) and volatile solid (VS) because the pretreatments could disrupt the floc structure and even the microbial cells of sludge. The results of batch anaerobic fermentation experiments demonstrated that all of the four pretreatments could select hydrogen-producing microorganisms from the microflora of sludge and enhance the hydrogen production. The hydrogen yield of the alkaline pretreated sludge at initial pH of 11.5 was the maximal (11.68 mL H2/g VS) and that of the thermal pretreated sludge was the next (8.62 mL H2/g VS). The result showed that the hydrogen yield of pretreated sludge was correlative with its SCOD. The hydrogen yields of acid pretreated sludge and alkaline pretreated sludge were also influenced by their initial pH. No methane could be detected in the anaerobic fermentation of alkaline pretreated sludge and thermal pretreated sludge, which suggested that these pretreatments could fully inhibit the activity of methanogens. The volatile fatty acids (VFA) production in anaerobic fermentation of alkaline pre- treated sludge was the maximum and the next is that of thermal pretreated sludge.

关键词：污泥预处理碱预处理生物制氢挥发性脂肪酸碱性预处理污水处理厂挥发性固体初始pH值

PH DEPENDENCY OF HYDROGEN FERMENTATION FROM ALKALIPRETREATED SLUDGE

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Chinese Science Bulletin 2006年第4期51卷 399-404页

作者： xiao benyi LIU Junxin Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Batch tests were carried out to study the possibility of hydrogen production from alkali-pre- treated sludge without seed and the pH dependency of hydrogen fermentation from alkali-pretreated sludge. Experimental results showed that the sewage sludge with alkali-pretreatment could be successfully applied to biologically producing hydrogen without seed and extra-feed. The results also showed that the initial pH value of sewage sludge was an impor-tant factor throughout the hydrogen fermentation of alkali-pretreated sludge. The maximum hydrogen yield was obtained at initial pH value of 11.0 (14.4 mL·g VS-1). The hydrogen yield of alkali-pretreated sludge at alkaline initial pH value was much higher than that of acidic or neutral initial pH value. The op-timal pH value of hydrogen production from alkali- pretreated sludge was approximately 9.5. The con-sumption of hydrogen could be inhibited when the pH value of sludge was above 8.5. The change of hy-drogen yield at various initial pH values was similar to that of sludge SCOD. The change of sludge pH value was slow and acetate was the major component of volatile fatty acids produced in the process of hy-drogen production. The yield and the constitution of volatile fatty acids were sensitive to the initial pH value.

关键词：碱预处理厌氧发酵制氢污泥 pH值废水处理

第一届全国学生(青年)运动会武术套路(校园组)竞技格局分析

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体育科技文献通报 2024年第1期32卷 67-73页

作者：扶本怡舒颜开李坚毛其德湖南科技大学体育学院湖南湘潭411201 湖南省长沙市体育局湖南长沙410013 湖南省地质中学湖南长沙410011

采用文献资料法、数理统计法、归纳分析法,研究中国武术套路竞技格局、发展趋势及湖南省在比赛中的实力表现。结果表明:学青会武术赛事中,奖牌占有率高度集中,地域性波动明显。武术套路的竞技格局呈现出一种“少数强者、多数平庸、多数... 详细信息

采用文献资料法、数理统计法、归纳分析法,研究中国武术套路竞技格局、发展趋势及湖南省在比赛中的实力表现。结果表明:学青会武术赛事中,奖牌占有率高度集中,地域性波动明显。武术套路的竞技格局呈现出一种“少数强者、多数平庸、多数较弱”的态势。长拳类、太极拳类项目主要由华东地区主导,南拳类比赛则以华南地区为主。对练项目中,天津市表现出色。集体项目中,湖南省和四川省分别占据了金牌的宝座。湖南省在武术套路运动中有新突破,但存在项目发展不均衡、男女运动员队伍之间发展不平衡等问题。建议:武术套路竞技水平相对薄弱的地区借鉴其他地区成功经验,多领域发展,推动全国武术套路多极化深入发展。湖南省应创新武术套路制度体系,制定针对性对策,培养后备优秀人才,加强与国内外优秀团队交流与合作,增加对校园组别的关注和支持。

关键词：武术套路赛事分析竞技格局