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Effect of wastewater particles on catalytic ozonation in the advanced treatment of petrochemical secondary effluent

CHEMICAL ENGINEERING JOURNAL 2018年 345卷 280-289页

作者： Zhang, Siyu wu, Changyong Zhou, Yuexi Wang, Yaning He, xuwen China Univ Min & Technol Sch Chem & Environm Engn Beijing 100083 Peoples R China Chinese Res Inst Environm Sci State Key Lab Environm Criteria & Risk Assessment Beijing 100012 Peoples R China Chinese Res Inst Environm Sci Res Ctr Water Pollut Control Technol Beijing 100012 Peoples R China Dalian Ocean Univ Sch Marine Sci & Technol & Environm Dalian 116032 Liaoning Peoples R China

The effect of wastewater particles on catalytic ozonation during the treatment of petrochemical secondary effluent (PSE) was investigated. The dissolved organic carbon (DOC) removal results indicated that wastewater particles could significantly affect the catalytic oxidation reaction and increase ozone (O-3) consumption. When the suspended solids (SS) was filtered by the 0.45 mu m membrane, the O-3 dosage to DOC removal ratio was 1.99 mg(O3) mg(DOC)(-1), while it increased to 2.99 mg(O3) mg(DOC)-1 when the SS concentration was 50 +/- 1.57 mg L-1. Wastewater particles can react with O-3, thus reducing the O-3 and hydroxyl radicals (% OH) available for DOC removal. When the SS concentration was 30 +/- 0.96 mg L-1, O-3 dosages lower than 10 mg L-1 did not induce a change in the size and surface characteristics of the particles. Following the increase in the O-3 dosage to 36 mg L-1, extracellular polymeric substances (EPS) reacted with O-3/(center dot) OH with different characteristics. Dissolved organic matter (DOM) had the highest depletion reaction rate, followed by the loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS). The average reaction rates of the three constituents were 1.44, 0.212, and 0.079 mg L-1 min(-1), respectively. In addition, the results showed that eliminating wastewater particles would be beneficial for the removal of organic micro-pollutants (OMPs) by catalytic ozonation.

关键词： Organic micro-pollutants (OMPs) Biological flocs Catalytic ozonation Extracellular polymeric substances (EPS) Excitation-emission matrix (EEM)

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基于HX710的车辆称重物联系统设计

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自动化应用 2022年第4期 154-157,162页

作者：陈德富周旭文吴华君邱宝象屈亮亮浙江工业大学信息工程学院浙江杭州310023 万向钱潮股份有限公司浙江杭州311215

目前车辆载荷监测主要采用分离式称重设备进行固定点位称重,这种方式往往存在着精度低、耗时长以及设备铺设困难等问题。针对上述所面临的问题,设计了一种基于HX710的车辆称重物联系统。系统以嵌入式系统、HX710模数转换芯片、NB-IoT模... 详细信息

目前车辆载荷监测主要采用分离式称重设备进行固定点位称重,这种方式往往存在着精度低、耗时长以及设备铺设困难等问题。针对上述所面临的问题,设计了一种基于HX710的车辆称重物联系统。系统以嵌入式系统、HX710模数转换芯片、NB-IoT模块为核心,采集由电阻应变片组成应变电桥的电信号,经过处理后,通过无线通信模块发送至阿里云物联网平台,从而实现远程情况下的车辆载荷实时监测。通过实验验证,该系统实现了预期效果,具有实时性、高精度、装配快捷等特点。

关键词：车载称重 HX710 物联网嵌入式系统 NB-IoT

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The mobility of thallium in sediments and source apportionment by lead isotopes

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CHEMOSPHERE 2019年 219卷 864-874页

作者： Liu, Juan Yin, Meiling Luo, xuwen Xiao, Tangfu wu, Zhifeng Li, Nuo Wang, Jin Zhang, Weilong Lippold, Holger Belshaw, Nick Stanley Feng, Yuexing Chen, Yongheng Guangzhou Univ Sch Environm Sci & Engn Inst Environm Res Greater Bay Minist EducKey Lab Water Qual & Conservat Pearl Guangzhou 510006 Guangdong Peoples R China Univ Oxford Dept Earth Sci Oxford OX1 3AN England Helmholtz Zentrum Dresden Rossendorf Inst Ressourcenokol D-04318 Leipzig Germany Univ Queensland Sch Earth & Environm Sci Brisbane Qld 4072 Australia

Thallium (TI) is a very toxic heavy metal. As a part of ongoing investigations, the mobility, sources and fate of TI were investigated for sediments from a watershed in the northern part of the Pearl River, South China, whose catchment has been seriously impacted by large-scale Pb Zn smelting activities onshore. A wide dispersion of severe TI contamination was observed throughout the depth profiles. A modified IRMM (Institute for Reference Materials and Measurements, Europe) sequential extraction procedure of a selected depth profile uncovered an exceptionally high enrichment of TI in geochemically-mobile fractions (i.e., weak-acid-exchangeable, reducible and oxidizable fractions), on average 5.94 +/- 2.19 mg/kg (74.6% +/- 5.1% of the total TI content) not only in the surface sediments but also in deep sediments. The proximal quantitative source apportionment using Pb isotopic fingerprinting technique indicated that a majority (80%-90%) of TI contamination along the depth profiles is anthropogenically derived from the Pb Zn smelting wastes. The results highlight the pivotal role of smelting activities in discharging huge amounts of geochemically-mobile TI to the sediments down to approximately 1 m in length, which is quantitatively evidenced by Pb isotopic tracing technique. Lead isotopes combined with distribution of TI and Pb contents identified a potential marker for a point source from the Pb Zn smelter in the river catchment, which also provides a theoretical framework for source apportionment of metal contamination in a larger river/marine system and in other sulfide mining/smelting areas likewise. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Thallium mobility Lead isotopes Source apportionnient Pb Zn smelting

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Optimized expression of classical swine fever virus E2 protein via combined strategy in Pichia pastoris

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PROTEIN EXPRESSION AND PURIFICATION 2020年 167卷 105527页

作者： Li, Ding wu, Junchen Chen, Jin Zhang, Dong Zhang, Yuanpeng Qiao, xuwen Yu, Xiaoming Zheng, Qisheng Hou, Jibo Jiangsu Acad Agr Sci Inst Vet Immunol & Engn Nanjing Peoples R China Yangzhou Univ Jiangsu Coinnovat Ctr Prevent & Control Important Yangzhou Jiangsu Peoples R China Minist Sci & Technol Jiangsu Key Lab Food Qual & Safety State Key Lab Cultivat Base Beijing Peoples R China Shandong Prov Ctr Anim Dis Control & Prevent Jinan Shandong Peoples R China

Precaution of classical swine fever (CSF) is an important mission for the worldwide swine industry. Glycoprotein E2 is the leading antigen candidate for subunit vaccine of classical swine fever virus (CSFV). In this study, two Spy-tagged E2 genes were synthesized in vitro and subcloned into pMCO-AOX vector for intracellular expression in Pichia pastor-is after methanol induction. Western blot analysis and semi-quantitative analysis showed that the yield of recombinant E2 protein was improved 17.87 folds by using co-translocational signal peptide cSIG. After the construction of the tandem multiple copy expression vectors, further increase of E2 production was observed by repetitive transforming expression vectors into P. pastoris genome. Finally, the yeast transformants harboring 8 or 16 copies of cSIG-E2-Spy increased the E2 expression level by 27.01-fold or 30.72-fold, respectively. These results demonstrate that utilizing co-translocational signal peptide together with multi-copy integration strategy can increase the production of recombinant E2 protein efficiently.

关键词： Classical swine fever virus E2 protein Co-translocational signal peptide Multi-copy integration Combined strategy

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Rapid masculinization and effects on the liver of female western mosquitofish (Gambusia affinis) by norethindrone

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CHEMOSPHERE 2019年 216卷 94-102页

作者： Hou, Liping Chen, Shangduo Chen, Hongxing Ying, Guangguo Chen, Diyun Liu, Juan Liang, Ye wu, Rongrong Fang, xuwen Zhang, Cuiping Xie, Lingtian Guangzhou Univ Sch Life Sci Guangzhou 510655 Guangdong Peoples R China South China Normal Univ Environm Res Inst MOE Key Lab Theoret Chem Environm Guangzhou 510006 Guangdong Peoples R China Guangzhou Univ Sch Environm Sci & Engn Guangdong Prov Key Lab Radionuclides Pollut Contr Guangzhou 510006 Guangdong Peoples R China Guangzhou Univ Minist Educ Inst Environm Res Greater Bay Innovat Ctr Guangzhou 510006 Guangdong Peoples R China Guangzhou Univ Minist Educ Key Lab Waters Safety & Protect Pearl River Delta Guangzhou 510006 Guangdong Peoples R China

Natural and synthetic progestins in receiving streams can disrupt the normal endocrine systems of fish. Norethindrone (NET) is a widely used synthetic progestin that often appears in wastewater effluents. For this research, adult female western mosquitofish (Gambusia affinis) were exposed to NET at three concentrations. The effects of NET on the following biological factors were evaluated: the histology of the ovaries and livers, the anal fin morphology, and transcription of genes related to steroidogenesis signaling pathways in the livers. After 42 d exposure to NET at 33.0 ng L-1 and 347.5 ng L-1, rapid masculinization, an increase in the number of atretic and postovulatory follicles in the ovary, enhanced vascularization, degenerated hepatocytes and irregular nuclei in the livers were observed. Exposure to NET did not affect the expression of the androgenic and estrogenic receptor genes and Cyp19a except for a significant up-regulation of Er alpha. However, the expression of Vtg A, Vtg B, and Vtg C were markedly inhibited in the females exposed to three concentrations of NET. Compared to the control female, exposure to NET at 33.0 ng L-1 and 347.5 ng L-1 caused a 4.4- and 5.8-fold increase in the expression of Hsd17 beta 3 in the livers, respectively. The results demonstrate that NET can cause rapid masculinization of female G. affinis, hepatopathological alterations and inhibited expressions of Vtg A, Vtg B, and Vtg C. The results imply that G. affinis populations might be threatened in NET-contaminated environment. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Norethindrone Gambusia affinis Masculinization Progestins Endocrine disrupting chemicals

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Anti-allergic Effects of Ginsenosides Extracted by High Temperature and High Pressure Method

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Chemical Research in Chinese Universities 2018年第3期34卷 382-388页

作者： LIU Ying LI xuwen ZHANG Hanqi wu Qian SHI Xiaolei JIN Yongri College of Chemistry Jilin University Changchun 130021 P. R. China College of Food Science and Engineering Jilin University Changchun 130062 P. R. China

Ginseng（Panax ginseng C. A. Mey.） is a traditional medicinal herb in Asia. Studies have shown that ginsenosides significantly affect immnnoregulation and rare ginsenosides have anti-allergic effects. In this research, a high temperature and high pressure method was utilized to increase the contents of rare ginsenosides in the ginseng extract（GE）. The anti-allergic effects of this extract were investigated in vivo. Water was used as the extraction solvent in extracting the rare ginsenosides via the high temperature and high pressure method. Extraction time and temperature were investigated in order to increase the contents of rare ginsenosides. Rare ginsenosides were qualitatively analyzed by HPLC-ESI-MS and quantitatively analyzed by HPLC-UV. Anti-allergic effects of the extracts were assessed using the ovalbumin（OVA）-induced allergic asthma model in vivo. An extraction temperature of 145 ℃ and extraction time of 2.0 h were chosen as the optimal conditions. Compared with traditional method, the contents of total rare ginsenosides extracted were considerably higher using the new method, that is, 14.74 times that extracted by the traditional method. In our in vivo experiments, treatment with high concentration GE may have anti-allergic erects in decreasing the total amount of IgE in serum and IL-4 in bronchoalveolar lavage fluid（BALF）, aud in improving the ratio of CD4^＋ to CD8^＋ T cells. The high temperature and high pressure method was an effective method to obtain GE containing more rare ginsenosides, which maybe become anti-allergic agents.

关键词： Food allergy High temperature and high pressure method Ovalbumin Rare ginsenoside

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边坡稳定性分析及治理技术研究

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山西建筑 2022年第3期48卷 89-91页

作者：伍永仟黎罡王文军张洁邹序文阳茜汕吉首大学土木工程与建筑学院湖南张家界427000

采用传递系数法分析边坡稳定性,最终确定边坡处于不稳定状态,采用理正岩土软件计算边坡的剩余下滑力,计算结果显示1-1′断面下部剩余下滑力最大为3822.8 kN。综合考虑采用抗滑桩+截排水方法进行治理,为同类工程提供依据。

关键词：滑坡抗滑桩边坡稳定

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输电线路杆塔结构及基础系统可靠度的优化分配

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建筑结构 2021年第7期51卷 128-132页

作者：吴静韩军科李茂华韩玉舟朱易龙安旭文侯建国中国电力科学研究院有限公司北京100192 武汉大学土木建筑工程学院武汉430072 北方工程设计研究院有限公司石家庄050011

输电线路结构系统可靠度在各子系统之间的合理分配,是输电线路结构系统可靠度研究的热点问题之一。根据某±800kV同塔双回路输电线路的工程实例,在对输电线路杆塔结构及基础可靠度进行计算分析的基础上,建立了输电线路杆塔结构、基... 详细信息

输电线路结构系统可靠度在各子系统之间的合理分配,是输电线路结构系统可靠度研究的热点问题之一。根据某±800kV同塔双回路输电线路的工程实例,在对输电线路杆塔结构及基础可靠度进行计算分析的基础上,建立了输电线路杆塔结构、基础的成本与相应结构可靠度之间的函数关系;基于经济指标的约束条件,对输电线路杆塔结构及基础系统可靠度的优化分配进行了计算分析。结果表明,该工程在满足成本的约束条件下,杆塔结构和基础分配的可靠度可分别达到3.7和4.2以上,输电线路杆塔结构及基础系统可靠度可达到3.7以上,满足现行规范《工程结构可靠性设计统一标准》(GB 50153—2008)规定的目标可靠度的要求。

关键词：输电线路杆塔结构杆塔基础系统可靠度优化分配

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An Algorithm for the Noninvasive and Personalized Measurement of Microvascular Blood Viscosity Using Physiological Parameters

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BIOMED RESEARCH INTERNATIONAL 2020年第0期2020卷 000-000页

作者： Sun, Ge Yang, Lin Wang, Weiwei Zhang, Song Luo, Zhichang wu, Guanghui Liu, Xiaohong Hao, Dongmei Yang, Yimin Li, xuwen Beijing Univ Technol Fac Environm & Life Sci Beijing 100124 Peoples R China Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100124 Peoples R China Chinese Acad Med Sci Fuwai Hosp Beijing 100037 Peoples R China Capital Med Univ Beijing Inst Heart Lung & Blood Vessel Dis Beijing Anzhen Hosp Beijing 100029 Peoples R China Beijing Yes Med Devices Co Ltd Beijing 100152 Peoples R China

Blood viscosity is one of the important parameters to characterize hemorheological properties of the human body. Its real-time and dynamic measurement has important physiological significance for studying the development and prevention of chronic diseases. This study researched noninvasive and personalized measurement of microvascular blood viscosity. In the microcirculation capillary network blood flow model, combined with pulse wave parameters, multiple regression analysis was used to fit the simulated radius of personalized physiological blood vessels to calculate the microvascular blood viscosity. The fitted value related to the simulated radius of the physiological blood vessel had a high correlation with the corresponding theoretically derived value (correlation coefficient: 0.904,P <= 0.001). The calculated value of the microvascular blood viscosity had a certain correlation with the clinical whole blood viscosity at a low shear rate (correlation coefficient: 0.443,P<0.05). This algorithm could provide effective means for noninvasive and long-term individual monitoring and family health care.

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Identification of unhealthy Panax notoginseng from different geographical origins by means of multi-label classification

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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019年 222卷 117243-000页

作者： Yang, Xiaodong Song, Jie wu, Xin Xie, Lin Liu, xuwen Li, Guanglin Southwest Univ Coll Engn & Technol Chongqing 400715 Peoples R China

Root-knot nematode is a common plant-parasitic pest with a highly destructive that infects more than 2000 plant species. Panax notoginseng (P. notoginseng) is one of the most susceptible traditional medicine. More importantly, it is difficult to distinguish the powders of P. notoginseng infected with root-knot nematode from those of healthy P. notoginseng due to the color and shape are same after being ground into powder. In this paper, Attenuated Total Reflection-Fourier Transform Infrared (ATR-FTIR) was used to identify P. notoginseng samples. Multiplicative scatter correction (MSC) was applied to preprocess the spectral data. Competitive adaptive reweighted sampling (CARS) and successive projection algorithm (SPA) were employed to select feature variables. Density-based spatial clustering of application with noise (DBSCAN) was adopted to discover groups within the data. Also, we found that the geographical origin is a pivotal factor to consider when identifying unhealthy P. notoginseng. Therefore, we introduced a novel multi-label classification (MLC) method to identify healthy and unhealthy P. notoginseng powders from three different geographical origins. In addition, binary relevance method (BR), classifier chain (CC), ensembles of classifier chains (ECC), and multilayer perceptron classifier (MLPC) were applied to create classification models, ECC exhibits superior performance in particular. (C) 2019 Elsevier B.V. All rights reserved.

关键词： Panax notoginseng Root-knot nematode Geographical origin Multi-label classification

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