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Polydimethylsiloxane assisted supercritical CO2 foaming behavior of high melt strength polypropylene grafted with styrene

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Frontiers of Chemical Science and Engineering 2016年第3期10卷 396-404页

作者： Weixia Wang shuai Zhou zhong Xin Yaoqi Shi Shicheng Zhao Shanghai Key Laboratory of Multiphase Materials Chemical Engineering East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China Shanghai Key Laboratory of Catalysis Technology for Polyolefin Shanghai Research Institute of Chemical Industry Shanghai 200062 China

Foamable high melt strength polypropylene （HMSPP） was prepared by grafting styrene （St） onto polypropylene （PP） and simultaneously introducing poly- dimethylsiloxane （PDMS） through a one-step melt extru- sion process. The effect of PDMS viscosity on the foaming behavior of HMSPP was systematically investigated using supercritical CO2 as the foaming agent. The results show that the addition of PDMS has little effect on the grafting reaction of St and HMSPP exhibits enhanced elastic response and obvious strain hardening effect. Though the CO2 solubility of HMSPP with PDMS （PDMS-HMSPP） is lower than that of HMSPP without PDMS, especially for PDMS with low viscosity, the PDMS-HMSPP foams exhibit narrow cell size distribution and high cell density. The fracture morphology of PDMS-HMSPP shows that PDMS with low viscosity disperses more easily and uniformly in HMSPP matrix, leading to form small domains during the extrusion process. These small domains act as bubble nucleation sites and thus may be responsible for the improved foaming performance of HMSPP.

关键词： high melt strength polypropylene (HMSPP),polydimethylsiloxane (PDMS) supercritical CO2 foaming behavior

Unsupervised noise-robust feature extraction for aerial image classification

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Science China(Technological Sciences) 2020年第8期63卷 1406-1415页

作者： liang Ye LU shuai WENG Rui HAN ChengZhe LIU Ming School of Astronautics Harbin Institute of TechnologyHarbin 150001China Academy of Art Harbin University of Science and TechnologyHarbin 150001China Academy of Software and Microelectronics Harbin University of Science and TechnologyHarbin 150001China

The rich data provided by satellites and unmanned aerial vehicles bring opportunities to directly model aerial image features by extracting their spatial and structural *** convolutional autoencoders(CAEs)have been attained a remarkable performance in ideal aerial image feature extraction,they are still challenging to extract information from noisy images which are generated from capture and *** this paper,a novel CAE-based noise-robust unsupervised learning method is proposed for extracting high-level features accurately from aerial images and mitigating the effect of *** from conventional CAEs,the proposed method introduces the noise-robust module between the encoder and the ***,several pooling layers in CAEs are replaced by convolutional layers with stride=*** performance of feature extraction is evaluated by the prediction accuracy and the accuracy loss in image classification experiments.A 5-classes aerial optical scene and a 9-classes hyperspectral image(HSI)data set are utilized for optical image and HSI feature extraction,*** features extracted from aerial images are utilized for image classification by a linear support vector machine(SVM)*** results indicate that the proposed method improves the classification accuracy for noisy images(Gaussian noise 2Dσ=0.1,3Dσ=60)in both optical images(2D 87.5%)and HSIs(3D 85.6%)compared with the traditional CAE(2D 78.6%,3D 84.2%).The accuracy loss in classification experiments increases with the increment of *** with the traditional CAE(2D 15.7%,3D 11.8%),the proposed method shows the lower classification accuracy loss in experiments(2D 0.3%,3D 6.3%).The proposed unsupervised noise-robust feature extraction method attains desirable classification accuracy in ideal input and enhances the feature extraction capability from noisy input.

关键词： aerial image classification convolutional autoencoder feature extraction noise-robust

Distribution of slip along an earthquake fault

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Acta Seismologica Sinica(English Edition) 2004年第5期17卷 542-548页

作者： WU zhong-liang(吴忠良) College of Earth Science Graduate School of Chinese Academy of ScienceBeijing100039China Institute of Geophysics China Earthquake AdministrationBeijing100081China

Slip distribution of the 1979 Imperial Valley, 1989 Loma Prieta, 1992 Landers, 1994 Northridge, and 1995 Kobe earthquake shows a piece-wise Gutenberg-Richters law. For small slips, the b-value is near to 1; while for ... 详细信息

关键词： earthquake slip Gutenberg-Richters law b-value

The BEM based on conformal Duffy-distance transformation for three-dimensional elasticity problems

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Science China(Technological Sciences) 2020年第12期63卷 2575-2583页

作者： TAN Fei liang JiaWei JIAO YuYong ZHU shuai LV JiaHe Faculty of Engineering China University of GeosciencesWuhan 430074China

Here,we describe the robust and efficient application of the conventional 3D BEM in solving elasticity problems. We have focused on the precise computation of weakly singular integrals. The conformal Duffy-distance transformation was employed to alleviate near singularities caused from two aspects:(1) the large aspect ratio of elements,i.e.,element shape distortions;and(2)the closeness of element boundaries to field points,i.e.,ill-shaped patches. Then,the rigid body motion method was employed to evaluate strongly singular integrals. Numerical solutions of 3D elastostatic problems demonstrated the high accuracy of the proposed method with coarse meshes and high convergence rates with mesh refinement. Compared with the Duffy transformation and original polar coordinate transformations,the proposed method is insensitive to element shapes.

关键词： singular integrals boundary element method elasticity problems conformal transformation Duffy transformation distance transformation

Nonpolar cross-stacked super-aligned carbon nanotube membrane for efficient wastewater treatment

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Frontiers of Environmental Science & Engineering 2023年第3期17卷 37-47页

作者： Shuang Zhang shuai liang Yifan Gao Yang Wu Xia Huang Bejing Key Laboratory for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Engineering Research Center for Water Pollution Source Control&Eco-remediation College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Department of Physics and Tsinghua-Foxconn Nanotechnology Research Center Tsinghua UniversityBeijing 100084China

Membrane separation technology has made great progress in various practical applications,but the unsatisfactory separation performance of prevailing membrane materials hampers its further sustainable *** study proposed a novel nonpolar super-aligned carbon nanotube(SACNT)membrane,which was prepared with a layer-by-layer cross-stacking *** controlling the number of stacked SACNT layers,three kinds of SACNT membranes(SACNT_200,SACNT 300,and SACNT_400)were *** characterizations and filtration tests were performed to investigate their physico-chemical properties,surface wetting behavior,and filtration *** with two commercial membranes(Com_0.22 and Com_0.45),all the SACNT membranes achieved smoother and more uniform *** to the hexagonal graphene structure of CNTs,the surface chemistry of the SACNT membranes is simple and inert,thereby potentially eliminating the covalent-bonding-induced membrane ***,the SACNT membranes exhibited a typical nonpolar wetting behavior,with high contact angles for polar liquids(water:~124.9°-126.5°;formamide:~80.0°-83.99)but low contact angles for nonpolar diodomethane(~18.8°-20.99).This unique nonpolar feature potentially leads to weak interactions with polar ***,compared with the commercial membranes,the SACNT membranes obtained a significantly higher selectivity while achieving a comparable or higher permeability(depending on the number of stacked layers).Moreover,the SACNT membranes exhibited superior separation performance in various application scenarios,including municipal wastewater treatment(2.3 times higher cleaning efficiency),electro-assistant fouling inhibition(or even self-cleaning),and oil/water separation(>99.2%of separation efficiency),suggesting promising application prospects in various fields.

关键词： Membranefouling Wastewater Membrane separation Antifouling Aligned carbon nanotube

Two-dimensional Boron Nitride for Electronics and Energy Applications

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Energy & Environmental Materials 2022年第1期5卷 10-44页

作者： Jiemin Wang liangzhu Zhang Lifeng Wang Weiwei Lei zhong-shuai Wu School of New Energy and Materials Southwest Petroleum UniversityChengdu Sichuan 610500China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute for Frontier Materials Deakin UniversityWaurn Ponds CampusLocked Bag 20000Geelong Vic.3220Australia Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023China

Two-dimensional(2D)boron nitride(BN),the so-called“white graphene,”has demonstrated a great potential in various fields,particularly in electronics and energy,by utilizing its wide bandgap(~5.5 eV),superior thermal stability,high thermal conductance,chemical inertness,and outstanding dielectric ***,to further optimize the performances from the view of structure-property relationship,the determinative factors such as crystallite sizes,layer thickness,dispersibility,and surface functionalities should be precisely controlled and ***,in this review,the synthesis and functionalization methods including“top-down”and“bottom-up”strategies,and non-covalent and covalent modifications for 2D BN are systematically classified and discussed at first,thus catering for the requirements of versatile ***,the progresses of 2D BN applied in the fields of microelectronics such as fieldeffect transistors and dielectric capacitors,energy domains such as thermal energy management and conversion,and batteries and supercapacitors are summarized to highlight the importance of 2D ***,these contents not only contain the state-of-the-art 2D BN composites,but also bring the current novel design of 2D BN-based microelectronic ***,the challenges and perspectives are proposed to better broaden the scope of this ***,this review will pave an all-around way for understanding,utilizing,and applying 2D BN in future electronics and energy applications.

关键词： boron nitride electronics energy functionalization nanosheets two-dimensional materials

Profiling biotoxicities of hexafluoropropylene oxide trimer acid with human embryonic stem cell-based assays

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Journal of Environmental Sciences 2022年第6期34卷 34-42页

作者： Shengxian liang Guoqiang liang Yue Zhang Xiufang Zhang Li zhong Institute of Life Sciences and Green Development College of Life SciencesHebei UniversityBaoding 071000China Western University of Health Sciences PomonaCalifornia 91766USA

Hexafluoropropylene oxide trimer acid(HFPO-TA), an emerging replacement of perfluorooctanoic acid(PFOA), has recently been reported to be a potential environmental *** to the similar structure to PFOA, HFPO-TA may cause comparable adverse effects on human health. Therefore, evaluating the toxic profiles of HFPO-TA has become an urgent *** this study, we investigated the cytotoxicity and hepatoxicity of HFPO-TA using human embryonic stem cell(h ESC)-based assays. Results showed that HFPO-TA reduced h ESCs’ viability in a dose dependent manner, and the calculated IC50 for 24, 48 and 72 hr were 222.8,167.4, and 80.6 μmol/L, respectively. Significant intracellular ROS accumulation and mitochondrion membrane potential reduction were detected with HFPO-TA exposure, and increased apoptotic/necrotic cells were also observed in high dose of HFPO-TA treated ***, HFPO-TA at noncytotoxic concentrations also significantly impaired the functions of induced hepatocytes by diminishing cell glycogen storage ability and deregulating specific functional genes. Transcriptome sequencing analysis identified a set of hepatic associated biological processes responding to HFPO-TA exposure. PPAR was the most significantly enriched pathway. Genes including FGA, FGB, FGG, AHSG, HRG, ITIH2, ALB were characterized as hub genes by cyto Hubba plug-in. These data indicated that HFPO-TA is a potential hepatotoxicant, and may not be a safe replacement for PFOA.

关键词： Hexafluoropropylene oxide trimer acid(HFPO-TA) Stem cell toxicology Hepatoxicity Transcriptional analysis

Recent progress of dendrite-free stable zinc anodes for advanced zinc-based rechargeable batteries:Fundamentals,challenges,and perspectives

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SusMat 2023年第2期3卷 180-206页

作者： Xiao Wang Chenglin Sun zhong-shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalianChina

Zinc-based batteries are a very promising class of next-generation electrochemical energy storage systems,with high safety,eco-friendliness,abundant resources,and the absence of rigorous manufacturing ***,practical applications of zinc-based rechargeable batteries are impeded by the low Coulombic efficiency,inferior cyclability,and poor rate capability,due to the instability of zinc ***,effective strategies for dendritefree zinc anode are symmetrically reviewed,especially highlighting specific mechanisms,delicate design of electrode and current collectors,controlled electrode|electrolyte interface,ameliorative electrolytes,and advanced separators ***,the particular mechanisms of dendrites formation and the associated fundamentals of the stable Zn metal anodes are presented ***,recent key strategies for dendrites prevention and hydrogen evolution reaction suppression are categorized,discussed,and analyzed in detail in view of the electrodes,electrolytes,and ***,the challenging perspectives and major directions of stable zinc anodes are briefly discussed for further industrialization and commercialization of zinc-based rechargeable batteries.

关键词： dendrite-free mechanisms zinc anode zinc ion batteries

Multi-level DEM study on silo discharge behaviors of non-spherical particles

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Particuology 2023年第11期82卷 179-191页

作者： Lei Xu Xiukai Wu Jingyin liang shuai Wang Shiyi Bao Institute of Process Equipment and Control Engineering College of Mechanical EngineeringZhejiang University of TechnologyHangzhou310032China Engineering Research Center of Process Equipment and Remanufacturing Ministry of EducationChina State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027China

The silo discharge of non-spherical particles has been widely practiced in engineering processes, yet the understanding of multi-level mechanisms during solid transportation is still lacking. In this study, a high-fidelity super-ellipsoid Discrete Element Method (DEM) model is established to investigate the discharge behaviors of non-spherical particles with different size distributions. After the comprehensive model validations, we investigated the effects of particle shape (aspect ratio and particle sharpness) on the particle level discharge behaviors. The discharge rates of the ellipsoid particles used in the current work are larger than the spherical particles due to the larger solid fraction. The discharge rates of the cuboid-like particles are determined by the combined effect of the solid fraction and the contact force. Parcel level data show that the translational movements of the ellipsoid particles are more ordered, which is supported by the global level data. Strong correlations exist between the particle level and parcel level data, especially the ellipsoid particles and the large particles in the polydispersed cases.

关键词： Multi-level study Non-spherical particle Numerical simulation Silo discharge Granular flow