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Lateral deformation of embankment with the CFG pile-net structure for Yun-Gui passenger dedicated line

Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 154-164页

作者： Pan, Gao-Feng Liu, Xian-Feng Yuan, Sheng-Yang Sun, Dan-Xi Tian, Mao-Cheng Wang, Yi-Bo Feng, Yan Jiang, Guan-Lu School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China key laboratory of High-speed Railway Engineering of Ministry of Education Southwest Jiaotong University Chengdu 610031 China State key laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 630031 China key laboratory for Traffic and Transportation Security of Jiangsu province Huaiyin Institute of Technology Huai'an 223003 China

Taking cement flyash gravel(CFG) pile-net structure embankment in the expansive soil area of the Yun-Gui (i.e., Yunnan-Guangxi) passenger dedicated line as the engineering background, a full-scale on-site embankment filling test was carried out to compare and analyze the lateral deformation law of the natural foundation and CFG pile-net composite foundation under the subgrade load. The results show that (1) the maximum lateral deformation of the natural foundation occurs at 1-2 m depth below the surface, while the maximum lateral deformation for the composite foundation appears at the depth of 0.6 times of the pile length, and the constraint effect of increasing the pile length on the lateral deformation is only obvious within the depth of 6 m. (2) The maximum lateral deformation has a linear relationship with the foundation settlement in stages. After the embankment exceeds a certain critical height, the lateral deformation develops sharply. (3) The critical filling height of the composite foundation decreases with the increase of pile length but the maximum lateral displacement decreases after stabilization. Finally, based on the hypothesis of lateral deformation stratification analysis and equal volume deformation, the method of predicting the lateral deformation of the foundation is proposed based on the measured soil parameters, and the accuracy is verified by the measured data. The research results can provide the theoretical reference for the construction design and deformation analysis of CFG pile-net structure roadbed. © 2020, Science Press. All right reserved.

关键词： Embankments

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Numerical investigation of effects of “baffles-deceleration strip” hybrid system on rock avalanches

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Journal of Mountain Science 2019年第2期16卷 414-427页

作者： BI Yu-zhang HE Si-ming DU Yan-jun SHAN Jie YAN Shuai-xing WANG Dong-po SUN Xin-po Institute of Geotechnical Engineering of Southeast University School of Transportation Southeast University key laboratory of Mountain Hazards and Surface Process Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chinese Academy of Sciences Center for Excellence in Tibet Plateau Earth Sciences University of Chinese Academy of Sciences State key laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology College of civil engineering Sichuan University of Science and Engineering

Arrays of baffles are usually installed in front of protection site to attenuate the flow energy of rock avalanches in mountainous areas. Optimization design is crucial for efficiency promotion in hazard energy dissipation engineering. In this study, a deceleration strip was added in the baffles protection system to optimize the traditional baffles system. The effects of the "baffles-deceleration strip" hybrid protection system was discussed in detail with the nails number and nails angle. This study presents details of numerical experiments using the discreteelement method(DEM). The effect of the optimization of hybrid protection system(nail angle and nail number) were investigated specifically, especially the impact force that avalanches exerted on structures. The results show that the maximum impact forces and kinetic energy of the rock avalanches decreases with the increase of the number and angle of the nail. Moreover, the distance between the toe and the bearing structure(L_m) is also a key factor. The shorter the distance L_m(30 m) is, the higher the maximum impact force are. The longer the distance L_m(70 m) is, the lower the maximum impact force are. Under the same size of the nails, increasing the numbers can enhance the dissipation ability of the hybrid protection system. Meanwhile, increasing itsangle can also enhance the dissipation ability. There are three key ways for nails attenuate rock avalanches:(i) block the fine particles directly;(ii) form the particles bridge between nails and baffles;(iii) dissipate the coarse particles energy directly. The effect of segregation in rock avalanches is crucial for the energy dissipation mechanism, which is a key factor to optimize the traditional baffle system.

关键词： Rock avalanches Baffles Hybrid system Energy dissipation Impact force

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A symmetric substructuring method for analyzing the natural frequencies of conical origami structures

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Theoretical & Applied Mechanics Letters 2024年第3期14卷 203-210页

作者： Chenhao Lu Yao Chen Weiying Fan Jian Feng Pooya Sareh key laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education and National Prestress Engineering Research CenterSoutheast UniversityNanjing 211189China School of Engineering University of LiverpoolLiverpool L693BXUnited Kingdom creative design Engineering Lab(Cdel) School of EngineeringNewcastle UniversityNewcastle upon Tyne NE17RUUnited Kingdom Escuela Técnica Superior de Ingeniería y Diseño Industrial Universidad Politécnica de Madrid(UPM)Madrid 28012Spain

Conical origami structures are characterized by their substantial out-of-plane stiffness and *** investigations have commonly focused on the static characteristics of these lightweight ***,the efficient analysis of the natural vibrations of these structures is pivotal for designing conicalorigami structures with programmable stiffness and *** this paper,we propose a novel method to analyzethe natural vibrations of such structures by combining a symmetric substructuring method(SSM)and a gener-alized eigenvalue *** exploits the inherent symmetry of the structure to decompose it into a finiteset of repetitive *** doing so,we reduce the dimensions of matrices and improve computationalefficiency by adopting the stiffness and mass matrices of the substructures in the generalized eigenvalue *** element simulations of pin-jointed models are used to validate the computational results of the ***,the parametric analysis of the structures demonstrates the influences of the number of seg-ments along the circumference and the radius of the cone on the structural mass and natural frequencies of ***,we present a comparison between six-fold and four-fold conical origami structures anddiscuss the influence of various geometric parameters on their natural *** study provides a strategyfor efficiently analyzing the natural vibration of symmetric origami structures and has the potential to contributeto the efficient design and customization of origami metastructures with programmable stiffness.

关键词： Natural structural vibration Origami design Group theory Symmetric substructuring method(SSM) Generalized eigenvalue analysis

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Application of different fiber structures and arrangements by electrospinning in triboelectric nanogenerators

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Chinese Journal of Chemical Engineering 2024年第5期69卷 177-191页

作者： Hebin Li Zifei Meng Dehua Wang Ye Lu Longlong Jiang Le Zhang Hanbin Wang Xiaoxiong Wang College of Physics Qingdao UniversityQingdao 266071China School of Physics and Electronic Engineering Jiangsu Normal UniversityXuzhouJiangsu 221000China Microsystem&Terahertz Research Center China Academy of Engineering Physics(CAEP)Chengdu 610200China Institute of Electronic Engineering China Academy of Engineering Physics(CAEP)Mianyang 621900China University-Industry Joint Center for Ocean Observation and Broadband Communication College of PhysicsQingdao UniversityQingdao 266071China Weihai innovation Research Institute of Qingdao University Weihai 264200China Collaborative innovation Center for Eco-Textiles of Shandong province and State Key Laboratory of Bio-Fibers and Eco-TextilesQingdao UniversityQingdao 266071China

In recent years,nanogenerators(NGs)have attracted wide attention in the energy field,among which triboelectric nanogenerators(TENGs)have shown superior *** reports of electrospinning(ES)-based TENGs have been reported,but there is a lack of deep analysis of the designing method from microstructure,limiting the creative of new ES-based *** TENGs use polymer materials to achieve corresponding design,which requires structural design of polymer *** existing polymer molding design methods include macroscopic molding methods,such as injection,compression,extrusion,calendering,etc.,combined with liquid-solid changes such as soluting and melting;it also includes micro-nano molding technology,such as melt-blown method,coagulation bath method,ES method,and nanoimprint *** fact,ES technology has good controllability of thickness dimension and rich means of nanoscale structure *** present,these characteristics have not been ***,in this paper,we combine recent reports with some microstructure regulation functions of ES to establish a more general TENGs design *** on the rich microstructure research results in the field of ES,much more new types of TENGs can be designed in the future.

关键词： Triboelectric nanogenerators Electrospinning Fiber microstructure regulation Nanomaterials Membranes Global optimization

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PEG400-mediated nanocarriers improve the delivery and therapeutic efficiency of mRNA tumor vaccines

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Chinese Chemical Letters 2024年第5期35卷 314-319页

作者： Wen Xiao Fazhan Wang Yangzhuo Gu Xi He Na Fan Qian Zheng Shugang Qin Zhongshan He Yuquan Wei Xiangrong Song Department of Critical Care Medicine Frontiers Science Center for Disease-related Molecular NetworkState Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengdu 610041China Medical Research Center The First Affiliated Hospital of Zhengzhou UniversityZhengzhou UniversityZhengzhou 450000China

Dendritic cell(DC)-targeted delivery of mRNA is a prominent method to boost the efficacy of mRNA tumor *** targeting ligands are often modified on nanocarriers by polyethylene glycol(PEG)linker in mRNA delivery *** the PEG linker length influences the targeting delivery efficiency of mRNA nanocarrier in vivo remains ***,we designed and constructed DC-targeted mRNA delivery systems modified by mannose via different PEG linker lengths(100/400/1000/2000)(MPn-LPX).The top candidate MP_(400)-LPX(the linker was PEG400)showed the optimal mRNA expression and antigen presentation owing to the highly efficient uptake by ***,MP_(400)-LPX could better inhibited tumor growth and extended survival in the E.G7-OVA lymphoma and TC-1 cervical tumor mouse ***,these results demonstrated that PEG400 was the optimal linker for the PEGylated DC-targeted mRNA *** findings provided a new platform for the rational design of targeted mRNA nanovaccines with shorter-length PEG.

关键词： Cancer immunotherapy mRNA vaccines DC-targeted delivery PEGylated liposomes Cellular uptake

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Simultaneously Improved Dielectric Constant and Breakdown Strength of PVDF-based Composites with Polypyrrole Nanowire Encapsuled Molybdenum Disulfide Nanosheets

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Chinese Journal of Polymer Science 2022年第5期40卷 515-525页

作者： Hua-Bin Luo Xiao-Ren Pan Jing-Hui Yang Xiao-Dong Qi Yong Wang School of Materials Science&Engineering Key Laboratory of Advanced Technology of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu 610031China

High-performance dielectric polymer composites have received increasing attention due to their important applications in the field of energy *** rational structural design of hybrid fillers can lead to a balance between high dielectric constant and insulation in *** this work,novel hybrid fillers were fabricated by in situ synthesizing one-dimensional polypyrrole nanowires(PPynws)on the twodimensional molybdenum disulfide(MoS_(2)),which integrated the good ion polarization ability of PPynws and the high insulation and adjustable band gap of MoS_(2).Compared with the binary poly(vinylidene fluoride)(PVDF)/MoS_(2) composites,the PVDF/MoS_(2)-PPynws composites exhibited remarkably improved dielectric constant and breakdown strength,while the dielectric loss was still maintained at a low *** optimal ternary composite with 1 wt%MoS_(2)-PPynws showed a high dielectric constant(15@1kHz),suppressed dielectric loss(0.027@1kHz),and high breakdown strength(422.1 MV/m).PPynws inducing strong interfacial polarization and the highly insulated MoS_(2) nanosheets extending the breakdown path mainly contributed to the synchronously enhanced dielectric constant and breakdown *** intriguing synthesis method of PVDF/MoS_(2)-PPynws nanocomposite will open up new opportunities for fabricating nanostructured polymer composites to produce high dielectric materials.

关键词： Hybrid fillers Molybdenum disulfide Polypyrrole nanowires Dielectric composites Breakdown strength

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Boosting hydrogen production of ammonia decomposition via the construction of metal-oxide interfaces

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Chinese Journal of Structural Chemistry 2024年第2期43卷 49-59页

作者： Jiangping Chen Hongju Ren Kai Wu Huihuang Fang Chongqi Chen Li Lin Yu Luo Lilong Jiang National Engineering Research Center for Chemical Fertilizer Catalyst(NERC-CFC) School of Chemical EngineeringFuzhou UniversityFuzhou350002China Qingyuan innovation laboratory QuanzhouFujian362801China

The ammonia decomposition for the production of carbon-free hydrogen has triggered great attention yet still remains challenging due to its sluggish kinetics,posting the importance of precise design of efficient catalysts for ammonia decomposition under low *** the metal-support interaction and interface is one of the most important strategies for promoting *** this work,by coating ceria onto the Ni nanoparticles(NPs),we discover that the Ni-CeO_(2)interfaces create an exceptional effect to enhance the catalytic decomposition of ammonia by over 10 folds,compared with the pristine *** kinetic analysis demonstrates that the recombinative N2 desorption is the rate-determining step(RDS)and the Ni-CeO_(2)interface greatly increases the *** on these understandings,a strategy to fabricate the Ni/CeO_(2)catalyst with abundant Ni-Ce-O interfaces via one-pot sol-gel method was employed(hereafter denoted to s-Ni/CeO_(2)).The s-Ni/CeO_(2)catalyst shows a high activity for ammonia decomposition,achieving a H_(2)formation rate of 10.5 mmol gcat1 min^(-1)at 550℃.Combined with a series of characterizations,the relationship between the catalyst structure and the performance was investigated for further understanding the effect of metal-oxide interfaces.

关键词： Metal-support interaction Ammonia decomposition Nickel Cerium oxide Metal-oxide interfaces

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Origami-inspired folding assembly of dielectric elastomers for programmable soft robots

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Microsystems & Nanoengineering 2022年第2期8卷 73-83页

作者： Yanhua Sun Dengfeng Li Mengge Wu Yale Yang Jingyou Su Tszhung Wong Kangming Xu Ying Li Lu Li Xinge Yu Junsheng Yu State key laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China(UESTC)Chengdu 610054People's Republic of China Chongqing key laboratory of Materials Surface&Interface Science Chongqing Co-Innovation Center for Micro/Nano Optoelectronic Materials and DevicesMicro/Nano Optoelectronic Materials and Devices International Science and Technology Cooperation Base of ChinaSchool of Materials Science and EngineeringChongqing University of Arts and SciencesChongqing 402160People's Republic of China Department of Biomedical Engineering City University of Hong KongHong Kong SAR 999077People's Republic of China

Origami has become an optimal methodological choice for creating complex three-dimensional(3D)structures and soft *** simple and low-cost origami-inspired folding assembly provides a new method for developing 3D soft robots,which is ideal for future intelligent robotic ***,we present a series of materials,structural designs,and fabrication methods for developing independent,electrically controlled origami 3D soft robots for walking and soft *** 3D soft robots are based on soft actuators,which are multilayer structures with a dielectric elastomer(DE)film as the deformation layer and a laser-cut PET film as the supporting flexible *** triangular and rectangular design of the soft actuators allows them to be easily assembled into crawling soft robots and pyramidal-and square-shaped 3D *** crawling robot exhibits very stable crawling behaviors and can carry loads while *** by origami folding,the pyramidal and square-shaped 3D soft robots exhibit programmable out-of-plane deformations and easy switching between two-dimensional(2D)and 3D *** electrically controllable origami deformation allows the 3D soft robots to be used as soft manipulators for grasping and precisely locking 3D *** work proves that origami-inspired fold-based assembly of DE actuators is a good reference for the development of soft actuators and future intelligent multifunctional soft robots.

关键词： robot folding dielectric

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Analysis of acquisition parameters and geometry quality

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Applied Geophysics 2018年第3期15卷 413-419页

作者： Zhao Hu Xu Hao Di Zhi-Xin Zhang Jin-Miao Liu Zhi-Peng Southwest Petroleum University Sichuan Province Natural Gas Geology Key LaboratoryChengdu 610500China School of Geoscience and Technology in Southwest Petroleum University Chengdu 610500China Petroleum Exploration and Production Research Institute SINOPEC Northwest Oilfi eld CompanyUrumqi 830011China SINOPEC Geophysical Corporation Research CenterBeijing 100020China CNOOC Research Institute Beijing 100028China

High-quality seismic geometry is the key to obtain high-quality seismic data, and can affect the accuracy of data processing and imaging. Based on the analysis of the relationship between the quality of the geometry and the four acquisition parameters(the number of traces, shot line spacing, and the space and number of receiver lines), a quality evaluation method of the geometry based on comprehensive quality factor(CQF) is proposed, and the relationship between the geometry quality and the four parameters is given. We use field data collected in an oil field in Western China with complex geology: First we use a wide azimuth geometry. Then, we calculate the relationship curve between geometry and data quality by varying each parameter while keeping the rest fixed. and the analysis results are given by using the CQF evaluation method. The results show that the shot-line spacing has the greatest effect on the quality of the geometry, and the increase of the receiver line spacing can appropriately improve the quality of the geometry, and the increase of the number of receiving traces can improve the geometry quality. The different acquisition parameters have different effects on the imaging quality of shallow and deep events. The model forward and prestack depth migration are used to generate prestack depth migration profiles with different acquisition parameters. The imaging results are consistent with the above calculated results. According to the depth of the target layer, the quality factor evaluation method is applied to guide the design of the geometry and optimize the acquisition parameters to improve the imaging accuracy of seismic data.

关键词： Seismic acquisition geometry quality factor acquisition parameters

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Research on the attribution evaluating methods of dynamic effects of various parameter uncertainties on the in-structure floor response spectra of nuclear power plant

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Earthquake Engineering and Engineering Vibration 2017年第1期16卷 47-54页

作者： Li Jianbo Lin Gao Liu Jun Li Zhiyuan State key laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024 China Ocean Engineering Joint Research Center of D UT- UWA Dalian University of Technology Dalian 116024 China

： Consideration of the dynamic effects of the site and structural parameter uncertainty is required by the standards for nuclear power plants （NPPs） in most countries. The anti-seismic standards provide two basic methods to analyze parameter uncertainty. Directly manually dealing with the calculated floor response spectra （FRS） values of deterministic approaches is the first method. The second method is to perform probability statistical analysis of the FRS results on the basis of the Monte Carlo method. The two methods can only reflect the overall effects of the uncertain parameters, and the results cannot be screened for a certain parameter＇s influence and contribution. In this study, based on the dynamic analyses of the floor response spectra of NPPs, a comprehensive index of the assessed impact for various uncertain parameters is presented and recommended, including the correlation coefficient, the regression slope coefficient and Tornado swing. To compensate for the lack of guidance in the NPP seismic standards, the proposed method can effectively be used to evaluate the contributions of various parameters from the aspects ＆sensitivity, acuity and statistical swing correlations. Finally, examples are provided to verify the set of indicators from systematic and intuitive perspectives, such as the uncertainty of the impact of the structure parameters and the contribution to the FRS of NPPs. The index is sensitive to different types of parameters, which provides a new technique for evaluating the anti-seismic parameters required for NPPs.

关键词： uncertain parameter floor response spectra (FRS) soil-structure interaction (SSI) seismic analysis andstructural design nuclear power plant (NPP)

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