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Design,fabrication,and dynamic mechanical responses of fiber-reinforced composite lattice materials

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International Journal of Mechanical System Dynamics 2023年第3期3卷 213-228页

作者： Jian Xiong Cheng Gong Qianqian wu Li Ma Jinshui Yang Linzhi wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Fiber-reinforced composites are a popular lightweight materials used in a variety of engineering applications,such as aerospace,architecture,automotive,and marine construction,due to their attractive mechanical *** lattice materials from fiber-reinforced composites is an efficient approach for developing ultra-lightweight structural systems with superior mechanical proper-ties and multifunctional *** contrast to corrugated,foam,and honeycomb core materials,composite lattice materials can be manufactured with various architectural designs,such as woven,grid,and truss ***,lattice materials with open-cell topology provide multifunctional advantages over conventional closed-cell honeycomb and foam structures and are thus highly desirable for developing aerospace systems,hypersonic vehicles,long-range rockets and missiles,ship and naval structures,and protective *** objective of this study is to review and analyze dynamic mechanical behavior performed by different researchers in the area of composite lattice materials and to highlight topics for future research.

关键词： fiber-reinforced composite lattice structures sandwich structures dynamic mechanical behavior

One and Two-Weight Z2R2 Additive Codes

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Chinese Journal of Electronics 2021年第1期30卷 72-76页

作者： LI Tiantian SHI Minjia LIN Bo wu Wenting School of Mathematical Sciences Anhui University School of Wendian Anhui University

This paper is devoted to the construction of one and two-weight Z2R2additive codes, where R2=F2[v]/(v~4). It is a generalization towards another direction of Z2Z4codes(S.T. Dougherty, H.W. Liu and L. Yu,"One weight Z2Z4additive codes", Applicable Algebra in Engineering, Communication and Computing, Vol.27,No.2, pp.123–138, 2016). A Mac Williams identity which connects the weight enumerator of an additive code over Z2R2and its dual is established. Several construction methods of one-weight and two-weight additive codes over Z2R2are presented. Several examples are presented to illustrate our main results and some open problems are also proposed.

关键词： dual codes additive code weight enumerator two-weight additive codes

A universal direct tensile testing method for measuring the tensile strength of rocks

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International Journal of Mining Science and Technology 2024年第10期34卷 1443-1451页

作者： Yang wu Jianfeng Liu Zhide wu Junjie Liu Yonghui Zhao Huining Xu Jinbing Wei Wen Zhong State Key Laboratory of Hydraulic and Mountain River Engineering Sichuan UniversityChengdu 610065China College of Water Resource and Hydropower Sichuan UniversityChengdu 610065China CNPC Key Laboratory of Oil and Gas Underground Storage Engineering Langfang 065007China College of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

There is limited applicability to the current method for testing the direct tensile strength of rocks because it places stringent requirements on the testing *** work suggests a universal method based on the‘‘compression-to-tensiono idea in response to these *** applying pressure,this technique makes it possible to test the tensile strength of rocks directly with any conventional compression test *** was utilized as the test material in order to validate this suggested testing method,and the results showed what *** determining the true fracture area through digital reconstruction,an average calculated tensile strength of 5.97 MPa with a Cvof 0.04 was *** is a positive correlation between tensile strength and the joint roughness coefficient(JRC)of the failure *** aggregation mode of AE events with the loading process conforms to the damage characteristics of rock tensile *** direct tensile testing method proposed in this study not only has high universality but also produces test results with outstanding ***,factors influencing the results of the tensile test are pointed out,and recommendations for optimizing the suggested testing method are offered.

关键词： Rocks Direct tensile strength Granite Acoustic emission JRC

Existence of Solutions for a Parabolic System Modelling Chemotaxis with Memory Term

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Journal of Partial Differential Equations 2020年第2期33卷 158-170页

作者： wu Shaohua LIU Lei School of Mathematics and Statistics Wuhan UniversityWuhan 430072China

In this paper,we come up with a parabolic system modelling chemotaxis with memory term,and establish the local existence and uniqueness of weak *** main methods we use are the fixed point theorem and semigroup theory.

关键词： Parabolic system chemotaxis memory term fixed point theorem

A Distortion Self-Calibration Method for Binocular High Dynamic Light Adjusting and Imaging System Based on Digital Micromirror Device

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IEEE/CAA Journal of Automatica Sinica 2024年第9期11卷 2036-2038页

作者： Pei wu Yanjie Wang Honghai Sun Zhuoman Wen University of Chinese Academy of Sciences Beijing 100049and NIO Inc.Shanghai 200000China Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China

Dear Editor,In order to realize the pixel level light adjusting control of the binocular high dynamic light adjusting and imaging system, this letter proposed a novel self-calibration method. By analyzing the optical design of the system, the causes of the distortion are given and a distortion model is established. Then, a quick and accurate self-calibration method is designed. The experiments indicate that the method can calibrate the two image sensors of the system at the same time,the average pixel deviation of the calibrated system is less than 0.5pixels and the maximum deviation is less than 1 pixel.

关键词： Dynamic system deviation

Enhancing oxygen reduction reaction of Pt-Co/C nanocatalysts via synergetic effect between Pt and Co prepared by one-pot synthesis

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Rare Metals 2023年第1期42卷 146-154页

作者： Yun-Feng wu Ji-Wei Ma Yun-Hui Huang School of Materials Science and Engineering Tongji UniversityShanghai201804China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

Designing highly active and durable electrocatalysts towards oxygen reduction reaction(ORR)plays a paramount importance for proton exchange membrane fuel ***-based binary alloys Pt-M(M=3d-transition metals)possessing excellent electronic and geometric properties have received increasing interests as highly active ***,we report a series of Pt_(x)Co/C(x=1,2,3)catalysts by a facile one-pot soft-chemistry *** the acidic conditions,the mass activities of PtCo/C,Pt_(2)Co/C and Pt_(3)Co/C are 0.526,0.462 and 0.441 A·mgPt^(-1),which are 2.60,2.31 and 2.22 times higher than that of Pt/C(0.200 A·mgPt^(-1)),*** specific activities of PtCo/C,Pt_(2)Co/C and Pt_(3)Co/C are 706.59,679.41 and 801.83μA·cm^(-2),which are accordingly 2.89,2.76 and 3.28 times higher than that of Pt/C(244.75μA·cm^(-2)).Notably,Pt_(3)Co/C shows a remarkable *** 5000 cycles of the accelerated durability testing,the mass activity and specific activity of Pt_(3)Co/C catalyst are 2.47 and 3.80 times higher than that of the commercial Pt/C,*** improved ORR activity and durability can be ascribed to the synergistic interaction between Pt and Co.

关键词： Proton exchange membrane fuel cells(PEMFCs) Pt_(x)Co/C catalysts Synergetic effect Oxygen reduction reaction(ORR) One-pot synthesis

Evaluation of the binding affinity and antioxidant activity of phlorizin to pepsin and trypsin

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Food Science and Human Wellness 2024年第1期13卷 392-400页

作者： Jing Zhang Lan Tang Xia Hu Zhen Zeng Wen wu Fang Geng Hui Li Di wu Meat Processing Key Laboratory of Sichuan Province School of Food and Biological EngineeringChengdu UniversityChengdu 610106China School of Chemical Engineering Sichuan UniversityChengdu 610065China

Phlorizin(PHL)is a natural compound with strong antioxidant properties mainly found in *** this paper,the interaction mechanism of PHL with pepsin and trypsin was comparatively evaluated by computer simulation,fluorescence spectra,circular dichroism(CD),and Fourier transform infrared(FT-IR)spectra at a molecular *** spectra showed that PHL quenches the pepsin/trypsin by static *** parameters indicated that PHL binds to pepsin mainly through hydrogen bonds and van der Waals forces,and that of trypsin was electrostatic *** ground state complexes PHL and protease have a moderate affinity of 105 L/mol PHL binds more strongly to trypsin than to *** and FT-IR spectra results showed that pepsin/trypsin decreased theβ-sheet content and slightly changed its secondary structure upon *** experimental results are mutually verified with the predicted computer-aid simulation *** PHL and trypsin binding,the antioxidant capacity of PHL was ***,the antioxidant capacity of PHL was decreased after binding to *** work elucidates the binding of PHL binding mechanisms to pepsin/trypsin and provides useful information for the digestion of PHL to improve the application of PHL in food processing.

关键词： Interaction Phlorizin Pepsin Trypsin Antioxidation

Isolation of a novel strain of Cyanobacterium *** good adaptation to extreme alkalinity and high polysaccharide yield

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Journal of Oceanology and Limnology 2021年第3期39卷 1131-1142页

作者： Zishuo CHEN Tao LI Bingjie YANG Xuejie JIN Hualian wu Jiayi wu Yandu LU Wenzhou XIANG CAS Key Laboratory of Tropical Marine Bio-resources and Ecology Guangdong Key Laboratory of Marine Materia MedicaInstitution of South China Sea Ecology and Environmental EngineeringRNAM Center for Marine MicrobiologySouth China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China State Key Laboratory of Marine Resource Utilization in South China Sea College of OceanologyHainan UniversityHaikou 570228China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China University of Chinese Academy of Sciences Beijing 100049China

The use of high alkaline medium is a feasible way to provide carbon source and prevent biological contamination for the outdoor cultivation of alkaliphilic microalgae and cyanobacteria.A novel cyanobacterial strain was isolated from the open pond of a marine green alga(Picochlorum ***-45015,Sanya,Hainan)and identified as Cyanobacterium *** effects of initial sodium bicarbonate(NaHCO_(3))concentrations on the growth and biochemical composition of Cyanobacterium ***-45682 were *** results demonstrated that Cyanobacterium ***-45682 had good adaptation to 16.8-g/L NaHCO_(3)(the same concentration of NaHCO_(3) used in Zarrouk medium for Spirulina).Moreover,the yields of biomass,polysaccharide,chlorophyll a(chl a),and phycocyanin increased under high NaHCO_(3) *** maximum final biomass concentration of 2.5 g/L was observed at 8.4-g/L NaHCO_(3),while the highest intracellular total saccharide content of 49.2%of dry weight(DW)and exopolysaccharide(EPS)concentration of 93 mg/L were achieved at the NaHCO_(3) concentration of 16.8 g/*** crude protein content declined under high NaHCO_(3) concentrations,which provide a possible explanation for the accumulation of *** study shows a good potential of alkaliphilic Cyanobacterium ***-45682 as a polysaccharide feedstock.

关键词： alkaliphilic cyanobacterium biochemical composition Cyanobacterium sp.SCSIO-45682 high sodium bicarbonate(NaHCO_(3))concentrations polysaccharide

A Comparison Study on the δD Value of Polycyclic Aromatic Hydrocarbons in Hydrous Pyrolysate of Herbaceous Peat with Different Water Medium

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Acta Geologica Sinica(English Edition) 2023年第6期97卷 1734-1743页

作者： DUAN Yi wu Yingzhong XING Lantian wu Yingqin ZHAO Yang LI Zhongping MA Lanhua DUAN Mingchen Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences and Gansu Provincial Key Laboratory of Petroleum ResourcesLanzhou 730000China Shaanxi Center of Mineral Geological Survey Xi'an 710068China College of Petroleum Engineering Liaoning Shihua UniversityFushunLiaoning 113001China Earthquake Research Institute of Lanzhou SSBLanzhou 730000China Business School Gansu University of Political Science and LawLanzhou 730070China

To investigate the influence of diagenetic water media on the hydrogen isotopes of individual sedimentary aromatic compounds,a series of hydrous pyrolyses were conducted on herbaceous *** aromatic hydrocarbons(PAHs)in hydrous pyrolysed samples and their hydrogen isotopic composition characteristics were *** aqueous medium demonstrated a significant influence on the hydrogen isotopic composition of the individual PAHs generated during *** results showed that the PAHs formed after pyrolysis in the presence of a saltwater medium with high δD value from a salt lake had a heavy hydrogen isotopic *** PAHs formed after pyrolysis in the presence of a fresh water medium with low δD value from a swamp had a light hydrogen isotopic *** difference in the average PAHδD value between the two hydrous experiments varied from -174‰ to -109‰,suggesting that the hydrogen isotopic composition of individual sedimentary PAHs can reflect the source of the diagenetic water *** addition,a comparative study found that the hydrogen isotopes of PAHs were superior to those of n-alkanes in the same sample for diagenetic water *** results indicated that the exchange of water-derived inorganic hydrogen and organic hydrogen was more intensive in freshwater experiments than in saltwater *** an increase in the simulation temperature,the average δD value of PAHs generated in the hydrous simulation experiments showed an increasing trend,reflecting that the δD value of sedimentary PAHs formed with the participation of diagenetic water media was still closely related to the thermal maturity of organic *** studies showed that theδD values of different types of organic compounds produced by hydrous pyrolysis of peat were in the order,PAHs>n-alkanes>methane.

关键词： hydrogen isotope PAHs hydrous pyrolysis herbaceous peat water medium