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Acceleration of floc-water separation and floc reduction with magnetic nanoparticles during demulsification of complex waste cutting emulsions

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Journal of Environmental Sciences 2020年第3期32卷 80-89页

作者： Yongjiao Xiong Xiangfeng Huang Bin Lu baoqiang wu Lijun Lu Jia Liu Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai200092China

Waste cutting emulsions are difficult to treat efficiently owing to their complex composition and stable emulsified *** an important treatment method for emulsions,chemical demulsification is faced with challenges such as low flocs-water separation rates and high sludge ***,in this study,Fe3O4 magnetic nanoparticles(MNPs)were used to enhance chemical demulsification performance for treating waste cutting emulsions under a magnetic *** addition of MNPs significantly decreased the time required to attain sludge-water separation and sludge compression equilibrium,from 210 to 20 *** addition,the volume percentage of sludge produced at the equilibrium state was reduced from 45% to 10%.This excellent flocculation-separation performance was stable over a pH range of *** magnetization of the flocculants and oil droplets to form a flocculant-MNP-oil droplet composite,and the magnetic transfer of the composite were two key processes that enhanced the separation of cutting ***,the interactions among MNPs,flocculants,and oil droplets were important in the magnetization process,which was controlled by the structures and properties of the three *** the magnetic field,the magnetized flocculant-MNP-oil droplet composites were considerably accelerated and separated from water,and the sludge was simultaneously ***,this study expands the applicability of magnetic separation techniques in the treatment of complex waste cutting emulsions.

关键词： Waste cutting emulsion Magnetic nanoparticle Flocculation Separation Acceleration

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Coupling magnetic particles with flocculants to enhance demulsification and separation of waste cutting emulsion for engineering applications

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Journal of Environmental Sciences 2021年第7期33卷 173-183页

作者： Yongjiao Xiong baoqiang wu Xiangfeng Huang Chenlu Li Bin Lu Jia Liu Lijun Lu Shiyang Li Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai 200092China

Magnetic particles were coupled with a flocculant to enhance the demulsification and separation of waste cutting *** optimal magnetic particle size and critical magnetic field conditions were investigated to achieve large-scale engineering application of magnetic demulsification separation for waste cutting emulsion *** micro-scale magnetic particles were found to show comparable effects to nano-scale magnetic particles on enhancing the demulsification and separation of cutting emulsions,which are beneficial for broadening the selectivity of low-cost magnetic *** critical magnetic separation region was determined to be an area 40 mm from the magnetic field *** to the flocculant demulsification,the magnetic demulsification separation exhibited a significant advantage in accelerating flocs-water separation by decreasing the separation time of flocs from 180-240 min to less than 15 min,compressing the flocs by reducing the floc volume ratio from 60%-90%to lower than 20%,and showing excellent adaptability to the variable properties of waste cutting *** with the design of the magnetic disk separator,continuous demulsification separation of the waste cutting emulsion was achieved at 1.0 t/hr for at least 10 hr to obtain clear effluent with 81%chemical oxygen demand removal and 89%turbidity *** study demonstrates the feasibility of applying magnetic demulsification separation to large-scale continuous treatment of waste ***,it addresses the flocs-water separation problems that occur in practical flocculant demulsification engineering applications.

关键词： Waste cutting emulsion Magnetic particles Demulsification and separation Magnetic disk separator Large-scale treatment

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Excited-state regulation in eco-friendly ZnSeTe-based quantum dots by cooling engineering

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Science China Materials 2022年第6期65卷 1569-1576页

作者： baoqiang wu Shuangyi Zhao Mingshui Zhang Zhigao Huang Chen Chen Zhigang Zang Yue Wang MIIT Key Laboratory of Advanced Display Materials and Devices Institute of Optoelectronics&NanomaterialsCollege of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Optoelectronic Technology&Systems(Ministry of Education) Chongqing UniversityChongqing 400044China School of Microelectronics and Communication Engineering Chongqing UniversityChongqing 400044China

The production of high-quality eco-friendly quantum dots(QDs)is challenging because of the efficient yet elusive nonradiative recombination *** study examined the effects of cooling engineering on regulating the excited states to realize high-quality ZnSeTe core-shell *** presence of ultrafast hot-carrier trapping and band-edge carrier trapping is responsible for the poor emission efficiency in ZnSeTe *** above processes can be suppressed simultaneously by engineering the cooling process,and the underlying mechanisms are interrogated by combined electronic and spectroscopic *** engineered ZnSeTe QDs exhibited record-high efficiency(>90%)and stability that were comparable to those of the canonical CdSe *** on the achievement,the ZnSeTe QD-based white light-emitting diodes(WLEDs)showed excellent optical performance,including a high color-rendering index of 80 and an appropriate correlated color temperature of 7391 ***,the WLEDs could serve as light sources in ecofriendly visible light *** results highlight the feasibility of eco-friendly QDs for practical applications without environmental hazards.

关键词： eco-friendly quantum dot ZnSeTe carrier dynamics white light emission visible light communication

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A Nomogram-based Model to Predict Neoplastic Risk for Patients with Gallbladder Polyps

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Journal of Clinical and Translational Hepatology 2022年第2期10卷 263-272页

作者： Xudong Zhang Jincheng Wang baoqiang wu Tao Li Lei Jin Yong wu Peng Gao Zhen Zhang Xihu Qin Chunfu Zhu Department of Hepato-biliary-pancreatic Surgery The Affiliated Changzhou No.2 People’s Hospital of Nanjing Medical UniversityChangzhouJiangsuChina Nanjing Medical University NanjingJiangsuChina Dalian Medical University DalianLiaoningChina

Background and Aims:Gallbladder polyp(GBP)assessment aims to identify the early stages of gallbladder *** studies have analyzed the risk factors for malignant *** this retrospective study,we aimed to establish a more accurate predictive model for potential neoplastic polyps in patients with ***:We devel-oped a nomogram-based model in a training cohort of 233 GBP *** information,ultrasonographic find-ings,and blood test findings were ***-Whitney U test and multivariate logistic regression analyses were used to identify independent predictors and establish the nomogram *** internal validation was conducted in 225 consecutive *** and clinical bene-fit of the model were evaluated using receiver operating characteristic curves and decision curve analysis(DCA),***:Age,cholelithiasis,carcinoembryonic antigen,polyp size,and sessile shape were confirmed as independent predictors of GBP neoplastic potential in the training *** with five other proposed predic-tion methods,the established nomogram model presented better discrimination of neoplastic GBPs in the training co-hort(area under the curve[AUC]:0.846)and the validation cohort(AUC:0.835).DCA demonstrated that the greatest clinical benefit was provided by the nomogram compared with the other five ***:Our developed preoperative nomogram model can successfully be used to evaluate the neoplastic potential of GBPs based on simple clinical variables that maybe useful for clinical decision-making.

关键词： Gallbladder polyps Neoplastic polyp Preoperative diagnosis Nom-ogram model

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Mn-doping induced electronic modulation and rich oxygen vacancies on vertically grown NiFe2O4 nanosheet array for synergistically triggering oxygen evolution reaction

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Nano Research 2022年第5期15卷 3940-3945页

作者： Yonghao Gan Meilin Cui Xiaoping Dai Ying Ye Fei Nie Ziteng Ren Xueli Yin baoqiang wu Yihua Cao Run Cai Xin Zhang State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and EnvironmentChina University of PetroleumBeijing 102249China

Large-scale electrolysis of water to produce high-purity hydrogen is one of the effective ways to solve the energy crisis and environmental pollution ***,efficient,cheap and stable catalysts are one of the bottlenecks for industrial application in water ***,a facile one-step hydrothermal process was applied to fabricate Mn-doped nickel ferrite nanosheets(Mn-NiFe_(2)O_(4))which shown a low overpotential of 200 mV at 50 mA·cm^(-2)and a small Tafel slope of 47 mV·dec^(-1),together with a prominent turnover frequency(TOF)value(0.14 s^(-1))and robust *** in-situ UV-vis spectroscopy unveiled the surface reconstruction to generate NiOOH as active sites during oxygen evolution reaction(OER).The excellent electrocatalytic activity of Mn-NiFe_(2)O_(4)is attributed to the vertically grown nanosheets for exposure more active sites,rich oxygen vacancies,and the hybridization between Ni 3d and O 2p orbitals caused by Mn *** work should provide a facile strategy by Mn-doping to simultaneously engineer oxygen vacancies and electronic structure for synergistically triggering oxygen evolution reaction.

关键词： Mn doping NiFe_(2)O_(4)nanosheets oxygen vacancies electronic modulation oxygen evolution reaction

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柔性和摩擦力不确定条件下RBF神经网络自适应轨迹跟踪方法

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机械工程学报 2012年第19期48卷 23-28页

作者：吴宝强孙炜曹成湖南大学电气与信息工程学院长沙410082 湖南大学教育技术与工程训练中心长沙410082

提出一种基于径向基神经网络(Radial basis function,RBF)的力/位置混合自适应控制方法并用于机器人轨迹跟踪控制,解决机器人柔性末端执行器轨迹跟踪过程中柔性和摩擦力模型难以精确描述的问题。RBF神经网络是一种高效的前馈式神经网络... 详细信息

提出一种基于径向基神经网络(Radial basis function,RBF)的力/位置混合自适应控制方法并用于机器人轨迹跟踪控制,解决机器人柔性末端执行器轨迹跟踪过程中柔性和摩擦力模型难以精确描述的问题。RBF神经网络是一种高效的前馈式神经网络,具有其他前向网络所不具有的非线性逼近性能和全局最优特性,并且网络结构简单,训练速度快。设计一种基于RBF神经网络非线性逼近能力来估计模型中的不确定参数的自适应控制器,给出控制器中神经网络权值更新规则,并证明所设计控制器输出力和位置误差的最终一致有界性。将该控制器应用于风管清扫机器人仿真试验,结果表明该自适应控制器能很好地用于柔性和摩擦力不确定条件下轨迹跟踪控制,与传统自适应控制方法相比具有更精确的跟踪特性和更强的鲁棒性。

关键词：柔性和摩擦力 RBF神经网络力位混合控制自适应控制

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局部对称黎曼流形中具有常中曲率完备超曲面

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数学物理学报（A辑） 2010年第4期30卷 1000-1005页

作者：张士诚吴报强徐州师范大学数学科学学院江苏徐州221011

该文研究了局部对称黎曼流形中的具有常平均曲率完备超曲面,获得了超曲面的一个特征定理,此定理推广了一些已有的结论.

关键词：局部对称超曲面全脐

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Will the Globe Encounter the Warmest Winter after the Hottest Summer in 2023?

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Advances in Atmospheric Sciences 2024年第4期41卷 581-586页

作者： Fei ZHENG Shuai HU Jiehua MA Lin WANG Kexin LI Bo wu Qing BAO Jingbei PENG Chaofan LI Haifeng ZONG Yao YAO baoqiang TIAN Hong CHEN Xianmei LANG Fangxing FAN Xiao DONG Yanling ZHAN Tao ZHU Tianjun ZHOU Jiang ZHU International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Nansen-Zhu International Research Centre(NZC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Center for Monsoon System Research(CMSR) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China CAS Key Lab of Regional Climate-Environment for Temperate East Asia(RCE-TEA) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

In the boreal summer and autumn of 2023,the globe experienced an extremely hot period across both oceans and *** consecutive record-breaking mean surface temperature has caused many to speculate upon how the global temperature will evolve in the coming 2023/24 boreal *** this report,as shown in the multi-model ensemble mean(MME)prediction released by the Institute of Atmospheric Physics at the Chinese Academy of Sciences,a medium-to-strong eastern Pacific El Niño event will reach its mature phase in the following 2−3 months,which tends to excite an anomalous anticyclone over the western North Pacific and the Pacific-North American teleconnection,thus serving to modulate the winter climate in East Asia and North *** some uncertainty due to unpredictable internal atmospheric variability,the global mean surface temperature(GMST)in the 2023/24 winter will likely be the warmest in recorded history as a consequence of both the El Niño event and the long-term global warming ***,the middle and low latitudes of Eurasia are expected to experience an anomalously warm winter,and the surface air temperature anomaly in China will likely exceed 2.4 standard deviations above climatology and subsequently be recorded as the warmest winter since ***,the necessary early warnings are still reliable in the timely updated mediumterm numerical weather forecasts and sub-seasonal-to-seasonal prediction.

关键词： winter climate El Niño seasonal forecast GMST

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型钢混凝土组合结构梁柱节点抗震性能有限元分析

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建筑科技 2022年第4期6卷 34-38页

作者：吴保强中铁建设集团有限公司江苏盐城224000

预应力混凝土梁(PRC)及型钢混凝土柱(SRC)节点抗震性能是大跨度框架结构安全设计的关键,为避免节点梁纵筋开孔穿过型钢柱,采用型钢短梁的新型节点形式.基于ABAQUS分析软件,建立PRC-SRC梁柱中节点精细化的数值模型,对其柱顶进行水平低周... 详细信息

预应力混凝土梁(PRC)及型钢混凝土柱(SRC)节点抗震性能是大跨度框架结构安全设计的关键,为避免节点梁纵筋开孔穿过型钢柱,采用型钢短梁的新型节点形式.基于ABAQUS分析软件,建立PRC-SRC梁柱中节点精细化的数值模型,对其柱顶进行水平低周往复循环荷载加载试验,得到的骨架曲线与已有的试验数据较为吻合,破坏形式基本一致,验证模型的可靠性,在此基础上分析了轴压比和预应力度对节点混凝土应力,钢筋与型钢应力和预应力筋应力的影响.结果表明,节点核心区的箍筋先出现屈服,其次是柱内型钢腹板,最后是柱型钢翼缘和梁短梁,这说明配置柱内型钢和梁短梁可以有效提高节点承载能力;随着轴压比的增加,型钢和钢筋笼节点核心区屈服范围减小,节点承载能力提高,并梁内预应力筋的应力有所增加.配置型钢短梁的预应力混凝土梁(PRC)-型钢混凝土柱(SRC)节点形式可以一方面有利于节点处梁纵筋的安置,还可以增加节点刚度.

关键词：预应力混凝土梁型钢混凝土柱节点数值模拟抗震性能

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Ballistic performances of the hourglass lattice sandwich structures under high-velocity fragments

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Defence Technology（防务技术） 2024年第1期31卷 312-325页

作者： He-xiang wu Jia Qu Lin-zhi wu Key Laboratory of Advanced Ship Materials and Mechanics College of Aerospace and Civil EngineeringHarbin Engineering UniversityHarbin150001China School of Civil Engineering Northeast Forestry UniversityHarbin150040China

In this paper,the numerical simulation method is used to study the ballistic performances of hourglass lattice sandwich structures with the same mass under the vertical incidence of *** is paid to elucidating the influences of rod cross-section dimensions,structure height,structure layer,and rod inclination angle on the deformation mode,ballistic performances,and ability to change the ballistic direction of *** results show that the ballistic performances of hourglass lattice sandwich structures are mainly affected by their structural *** this respect,structural parameters optimization of the hourglass lattice sandwich structures enable one to effectively improve their ballistic limit velocity and,consequently,ballistic performances.

关键词： Hourglass lattice sandwich structures Ballistic performances high-velocity Finite element analysis

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