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Preparation,characterization and performance of an electrospun carbon nanofiber mat applied in hexavalent chromium removal from aqueous solution

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Journal of Environmental Sciences 2019年第3期31卷 75-84页

作者： Zhihua Yuan Xiaoxia Cheng Lubin Zhong Renxiang Wu Yuming Zheng CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences

Hexavalent chromium, Cr(VI), a highly toxic oxyanion known as a carcinogen and mutagen,is an issue of concern due to its adverse impact on human health. Therefore, development of effective technologies and/or materials for Cr(VI) removal from water has been of great interest for researchers. In this study, an electrospun carbon nanofiber(CNF) mat was prepared via electrospinning polyacrylonitrile(PAN), followed by thermal pre-oxidation and carbonization. Scanning electron microscopy(SEM) observation showed that the fiber diameter of the CNF with carbonization temperature of 950°C(CNF_(950)) was about 266 *** titration analysis demonstrated that the point of zero charge p H(pHpzc) of CNF_(950) was around 7.93. CNF_(950) demonstrated high adsorption capacity and fast adsorption kinetics for Cr(VI) at pH mats for Cr(VI)-contaminated water purification.

关键词： Adsorption Carbon nanofiber mat Electrospinning Hexavalent chromium Redox reaction

Hierarchical electrospun nanofibers treated by solvent vapor annealing as air filtration mat for high-efficiency PM2.5 capture

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Science China materials 2019年第3期62卷 423-436页

作者： Xinxin Huang Tifeng Jiao Qingqing Liu Lexin Zhang Jingxin Zhou Bingbing Li Qiuming Peng State Key Laboratory of Metastable materials Science and Technology Yanshan UniversityQinhuangdao 066004China Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China Department of Chemistry Science of Advanced Materials Doctoral ProgramCentral Michigan UniversityMount PleasantMI 48859USA

Recently, air pollution has become more serious and started to have a dramatic effect on the health of humans in many large cities. Generally, outdoor personal protection,such as commercial masks, cannot effectively prevent the inhalation of many pollutants. Particulate matter(PM) pollutants are a particularly serious threat to human health. Here we introduce a new efficient air filtration mat that can be used for outdoor protection. The new efficient air filter’s nanocomposite materials were successfully fabricated from poly(ε-caprolactone)/polyethylene oxide(PCL/PEO) using an electrospinning technique and solvent vapor annealing(SVA).SVA treatment endows the wrinkled fiber surface and enhances the PM2.5 capture capacity of protective masks. This nanowrinkled air filtration mat can effectively filter PM2.5 with a removal efficiency of 80.01% under seriously polluted conditions(PM2.5 particle concentration above 225 mg m-3).Our field test in Qinhuangdao indicated that the air filtration mat had a high PM2.5 removal efficiency under thick *** to commercial masks, the fabricated SVA-treated PCL/PEO air filter mat demonstrated a simpler and ecofriendly preparation process with excellent degradation characteristics, showing wide potential applications with a high filtration efficiency.

关键词： electrospinning nanofiber mat solvent vapor annealing air filtration PM2.5 removal

GST pull-down筛选冠突曲霉mat的互作蛋白

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中国生物工程杂志 2022年第3期42卷 1-12页

作者：吴娟徐宁张胜花张小丹刘缘圆葛永怡贵州大学生命科学学院贵阳550025

目的:冠突曲霉(Aspergillus cristatus)是一种同宗结合菌,它的产孢受渗透压调控,与构巢曲霉的光调控产孢机制存在较大差异。冠突曲霉的有性生殖主要受mat1-1-1和mat1-2-1调控,但mat基因对该菌有性生殖的调控机制仍不清楚。期望筛选得到... 详细信息

目的:冠突曲霉(Aspergillus cristatus)是一种同宗结合菌,它的产孢受渗透压调控,与构巢曲霉的光调控产孢机制存在较大差异。冠突曲霉的有性生殖主要受mat1-1-1和mat1-2-1调控,但mat基因对该菌有性生殖的调控机制仍不清楚。期望筛选得到冠突曲霉mat的互作蛋白,为深入研究冠突曲霉有性产孢机制奠定基础。方法:利用GST pull-down联合液相色谱-串联质谱(LC-MS/MS)技术筛选可能与冠突曲霉mat1-1-1和mat1-2-1互作的蛋白,结合ProteinPilot和冠突曲霉基因组注释结果进行互作蛋白的注释及GO分析,其中互作蛋白SI65_00917和SI65_03348利用RT-qPCR探索它们与有性发育的联系,并利用酵母双杂交技术初步验证它们与mat蛋白的互作关系。结果:成功构建了GST-mat1-1-1、GST-mat1-2-1表达载体,诱导表达纯化出目的诱饵蛋白,分别利用诱饵蛋白捕获冠突曲霉总蛋白中的互作蛋白,经分析、筛选共鉴定出与mat1-1-1互作的蛋白56个,与mat1-2-1互作的蛋白413个。GO分析表明,这些蛋白参与翻译调控、代谢过程、蛋白质转运及蛋白结合等生物学过程,具有核苷酸结合活性、催化活性、蛋白结合活性;RT-qPCR结果表明互作蛋白SI65_00917可能与有性发育相关。酵母双杂交结果表明,SI65_00917蛋白具有自激活作用,可能是转录因子;SI65_03348蛋白与mat1-1-1、mat1-2-1在酵母中均有互作。结论:mat通过与其他蛋白直接或间接的相互作用调控其有性发育过程。

关键词：冠突曲霉 mat GST pull-down 互作蛋白

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Experiments Using Capillary mat as Ground Heat Exchanger for Ground Source Heat Pump Heating Application

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Energy and Power Engineering 2019年第11期11卷 363-378页

作者： Arif Widiatmojo Shrestha Gaurav Takeshi Ishihara Akira Tomigashi Kasumi Yasukawa Youhei Uchida Shohei Kaneko Mayumi Yoshioka Renewable Research Center National Institute of Advanced Industrial Science and Technology Koriyama Japan Japan Oil Gas and Metals National Corporation (JOGMEC) Tokyo Japan

The cooling and heating of spaces are among the largest sources for household’s energy demand. Ground Source Heat Pump (GSHP) is a promising technology to reduce the energy for cooling and heating purposes. However, the major obstacle hindering the utilization of this technology is the high initial cost, especially for the installation of ground coupled heat exchanger. The horizontal closed-loop system offers lower installation cost, as it requires no vertical borehole construction. Instead, the heat exchangers can be installed in shallow trenches that may be excavated, by small excavator or even by human labor. This paper presents the comparison of two different heat exchangers, namely, the capillary mat and the widely used slinky pipe. Both heat exchangers are connected to a heat pump, where continuous heating tests were carried out for 165 hours (~7 days) for each configuration. The purpose of this research is to show the performance of capillary mat in comparison to slinky pipe. Despite during the entire test for capillary mat required 6% higher electricity consumption, compared to slinky heat exchanger, the results still suggest the potential use of capillary mat as alternative to slinky heat exchanger. Additionally, the results also highlight the high hydraulic resistance of installed capillary mat heat exchangers may become the major disadvantage of the capillary mat.

关键词： Horizontal Heat Exchanger Ground Source Heat Pump Capillary mat

Performance of a Large mat Foundation on Soft Rock

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Journal of Southeast University(English Edition) 1996年第2期12卷 57-62页

作者：张克恭 MutazQutob

A mat foundation for a highrise structure of a 30 storey building in Nanjing, *** founded on soft bedrock has been monitored over a construction period of one year. To compare the performance of the foundatio... 详细信息

关键词： finite element mat foundation settlement contact pressure stress

Influence of the Elastic Modulus of the Soil and Concrete Foundation on the Displacements of a mat Foundation

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Open Journal of Civil Engineering 2013年第4期3卷 228-233页

作者： Oustasse Abdoulaye Sall Meissa Fall Yves Berthaud Makhaly Ba Département Génie Civil UFR SI-Université de Thiès Thiès Sénégal UFR Ingénierie Université Pierre et Marie Curie Paris France

In this paper, we suggest to study the behavior of a mat foundation on subsoil from the plate theory taking into account the soil-structure interaction. The objective is to highlight the soil-structure interaction particularly the influence of the rigidities of the soil and the concrete on the subgrade reaction (k) and the displacements of the mat foundation subjected to vertical loads. From plate theory and the soil-structure interaction, the general equation is reached. This equation depends more on the subgrade properties than the concrete foundation properties. Consequently, the behavior of the mat foundation is more influenced by soil properties than the concrete.

关键词： mat Foundation Plate Theory Soil-Structure Interaction Mechanical Properties

Effect of Needle Punching Process on a Chopped Strand mat Composite with an Open Hole

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Open Journal of Composite materials 2018年第3期8卷 110-123页

作者： Daiki Ichikawa Hiroyuki Hamada Akio Ohtani Graduate School of Kyoto Institute of Technology Kyoto Japan Future-Applied Conventional Technology Center Kyoto Institute of Technology Kyoto Japan Faculty of Fiber Science and Engineering Kyoto Institute of Technology Kyoto Japan

The easiest and most reliable joining method is the mechanical joint with a bolt and nut or rivet. However, in the case of composite laminates, mechanical joint properties decrease because of lower interlaminar properties compared to in-plane properties around hole.?This study investigated needle punching process with the aim of improving the mechanical properties in the thickness direction of fiber-reinforced plastic composite laminates with an open hole. Needle punching process was applied to glass fiber chopped strand matused as the reinforcement for the composite laminates. Open-hole tensile tests and observations of end cross-sections after the tests were performed. The tensile properties and fracture mechanism of the specimens subjected to needle punching process were investigated. In addition, characteristic distance (a parameter for evaluating resistance to fracture in open-hole tensile test specimens) was also calculated to examine the effects of needle punching process conditions on fracture toughness. Tensile strength was improved by more than 15% by needle punching process. However, when a certain needle punching density was exceeded, the mechanical properties worsened. In addition, characteristic distance increased with increasing needle punching density. Thus, these results suggest that there is an optimal needle punching density with respect to strength and characteristic distance.

关键词： Fiber-Reinforced Plastic Needle Punch Chopped Strand mat Open Hole Characteristic Distance

Bioremediation of Diuron in Soil Environment: Influence of Cyanobacterial mat

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American Journal of Plant Sciences 2014年第8期5卷 1081-1089页

作者： Jamal Safi Yousef Awad Yasser El-Nahhal Al-Azhar University of Gaza Gaza Palestine Environmental Protection and Research Institute Gaza Palestine Al-Azhar University of Gaza Gaza Palestine Environmental Protection and Research Institute Gaza Palestine The Islamic University of Gaza Gaza Palestine

Diuron is a herbicide widely used in the Middle East;its field application creates many environmental problems. This study investigated the bioremediation of Diuron in soil environment by Cyanobacterial mats collected from Gaza Wadi. Various concentrations of Diuron were injected in water saturated soil samples pre-treated with Cyanobacterial mat for several periods. Percent growth of Jews mallow as a test plant was taken as indicator of biodegradation of Diuron. Results showed that Diuron was degraded in soil and degradation was more pronounced when Diuron was incubated with Cyanobacterial in the irrigation water. Larger applied rate of Cyanobacterial mat did not affect the biodegradation of Diuron. These encouraging results suggest that application of Cyanobacterial mat could be a suitable method to remediate soil pollution.

关键词： Cyanobacterial mat Diuron Soil

An Engineering Computational Method of Calculating Wave Forces on the mat and Platform's Sit-on-Bottom Stability

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China Ocean Engineering 1993年第1期8卷 117-124页

作者： Gu Jianming Pan Bin Postgraduate, Dept. of Naval Architecture and Ocean Engineering, Shanghai Jiao Tong University, Shanghai Lecturer, Dept. of Naval Architecture and Ocean Engineering, Shanghai Jiao Tong University, Shanghai

- In this paper, an engineering method is employed to calculate the horizontal and vertical wave forces on the mat of the submersible platform under Froude-Krylov hypothesis. According to some model tests, appropriate diffraction coefficients are selected. And the results of the formulae given in the paper agree satisfactorily with those experimental data now available. The proposed computational method is effective and convenient to use in evaluating the horizontal and vertical wave forces on the mat. An exmaple is also given in this paper. Finally, the effects of the vertical wave force on the platorm's sit-on-bottom stability are analyzed.

关键词： submersible platform mat wave force sit-on-bottom stability computation