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Dynamic symmetry breaking and structure-preserving analysis on thelongitudinal wave in an elastic rod with a variable cross-section

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Applied Mathematics and Mechanics(English Edition) 2022年第1期43卷 81-92页

作者： jingjing hu Mengbo XU Weipeng hu Ruisong JIANG Zichen DENG School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China School of Civil Engineering and Architecture Xi’an University of TechnologyXi’an710048China State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an710048China School of Aeronautics and Astronautics Sichuan UniversityChengdu610065China

The longitudinal wave propagating in an elastic rod with a variable cross-section owns wide engineering background,in which the longitudinal wave dissipation determines some important performances of the slender *** reproduce the longitudinal wave dissipation effects on an elastic rod with a variable cross-section,a structure-preserving approach is developed based on the dynamic symmetry breaking *** the dynamic model controlling the longitudinal wave propagating in the elastic rod with the variable cross-section,the approximate multi-symplectic form is deduced based on the multi-symplectic method,and the expression of the local energy dissipation for the longitudinal wave propagating in the rod is presented,referring to the dynamic symmetry breaking theory.A structure-preserving method focusing on the residual of the multi-symplectic structure and the local energy dissipation of the dynamic model is constructed by using the midpoint difference discrete *** longitudinal wave propagating in an elastic rod fixed at one end is simulated,and the local/total energy dissipations of the longitudinal wave are investigated by the constructed structure-preserving scheme in two typical cases in detail.

关键词： dynamic symmetry breaking longitudinal wave variable cross-section structure-preserving Hamiltonian

Parameter Optimization and Control Characteristics Analysis of TLMD System Based on Phase Deviation

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Journal of Shanghai Jiaotong university(Science) 2020年第3期25卷 372-383页

作者： hu jingjing XU Jiayun Wuhan Institute of Shipbuilding Technology Wuhan 430050China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China College of humanities and Sciences Guizhou Minzu UniversityGuiyang 550025China

Combined with the advantages and disadvantages of tuned liquid damper (TLD) and tuned mass damper (TMD),a double tuned liquid mass damper (TLMD) is proposed by replacing the rigid connection of TLD with the spring *** motion equation of a single-degree-of-freedom structure with a TLMD attached at its top is found under harmonic *** the energy consumption and amplitude of primary structure with equal mass ratio TMD,it is found that the energy dissipation performance of TLMD is better in the effective phase *** interaction process between TLMD and structure is analyzed,and the formula of phase deviation between the relative velocity of tank and the displacement of primary structure is *** analyzing the influence of mass ratio,frequency ratio,damping ratio and water depth ratio on the damping effect,the results show that the frequency ratio and liquid depth ratio have great influence on the size and location of deep resonance peak,and the mass ratio and damping ratio have great influence on the width of the effective frequency *** formula of equivalent damping ratio is proposed based on the principle of energy and it is found that the equivalent damping ratio is related to the phase deviation and change with the frequency ratio of the external excitation.

关键词： double tuned liquid mass damper phase deviation optimal parameter equivalent damping ratio control effect

Reservoir characteristics of Donghe well No.1 in Tarim Basin

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International Journal of Mining Science and Technology 2014年第5期24卷 719-724页

作者： Liao Taiping hu jingjing Lai Fuqiang Duan Yonggang School of Petroleum Engineering Chongqing University of Science and Technology National Oil and Gas Exploration and Development Corporation Well Completion Center Southwest Petroleum University

Based on the techniques of X-ray diffraction analysis, identification of the thin sections of core cast, phys- ical analysis and scanning electron microscopy analysis, this paper studied the reservoir characteristics of the Carboniferous strata in Donghe well No.1 of Tarim region. The results show that the reservoir lithology is mainly the fine-grained quartz sandstone with ferrocalcite and pyrite, mud cement-based, the permeability concentrated in 5-40 × 10-3 μm2, a small part of the high permeability up to 150-327 ×10-3 μm2 and porosity ranged from 10% to 20%. The most part of the reservoirs is low perme- ability with a small part of the layer in moderate-high permeability. The types of reservoir space include intergranular pores, intra particle-molding pores, micro-pores and cracks, which mainly are intergranular pores with the pore diameter of 15-200 μm, 95.5μm on average. And the types of the throats are comolex with the main tvne of constricted l：hroats in this area and large contribution to the permeability.

关键词： Tarim Basin Carboniferous system Sandstone reservoir Physical characteristics Features of pore throats

Reconsideration of the sediment characteristics of the second member of the Triassic Xujiahe Formation in Sanhuiba,huaying Mountain

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Mining Science and Technology 2010年第4期20卷 591-599页

作者： LIAO Taiping hu jingjing ZHANG Furong LIU Lijing Chongqing University of Science and Technology Chongqing 401331 China Research Institute of Petroleum Exploration and Development PetroChina Beijing 100083 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

The second member of the Triassic Xujiahe Formation in the Sanhuiba area in huaying Mountain is an important section of sedimentary delta facies in the Chongqing Tianfu Geological Survey and Training Base. In spite of some initial efforts on its lithology and lithofacies, the existing research is yet to be completed and suffers from contradictory conclusions and inadequate evidence. Starting from the sedimentary microfaeies types and cyclic features, we analyzed the vertical sequence of a sedimentary delta model and discovered that this section is a constructional delta deposit. Eight incomplete and asymmetric regressive cycles are marked off, given that frequent erosion surfaces appeared in the section. Based on the analysis of structural characteristics of every monocycle, we summarized the system of cycles, tracts and sequence characteristics of the overall section. In view of this systematic series of cycles, we discussed the features of the syndepositional tectonic movements in the area and conclude that, due to frequent erosion, migration and diversion of a sub-channel branch was brought about by oscillating movements of the crust. In a comparison with neighboring sections, we explored the cause of erosion and the relations between erosion and cycles. This study greatly strengthens existing research and theories, makes an important and comprehensive contribution to geological surveys and training in the area and provides essential suggestions for coal exploration, oil and gas evaluation and in general to exploration and development in the target stratum.

关键词： huaying Mountain Sanhuiba Xujiahe Formation member 2 sandbodies sedimentary characteristics reconsideration

Genome-wide screening of long non-coding RNAs involved in rubber biosynthesis in Eucommia ulmoides

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Journal of Integrative Plant Biology 2018年第11期60卷 1070-1082页

作者： huimin Liu Yan Lu Juan Wang jingjing hu Tana Wuyun State Key Laboratory of Tree Genetics and Breeding Non-timber Forest Research and Development CenterChinese Academy of ForestryZhengzhou 450003China State Key Laboratory of Tree Genetics and Breeding Research Institute of ForestryChinese Academy of ForestryBeijing 100091China Chemistry department University of Missouri-ColumbiaColumbia MO 65201USA Inertia Shanghai Biotechnology Co. Ltd.Shanghai 200335China

Increasing evidence indicates that long non- coding RNAs （IncRNAs） play pivotal roles in regulatory networks controlling plant and animal gene expression. However, IncRNA roles in regulating rubber biosynthesis in Eucommia ulmoides, an emerging source of natural rubber （Eu-rubber）, are currently unknown. Here, we report on RNA deep-sequencing of E. ulmoides fruits at two developmental stages. Based on application of a stringent pipeline, 29,1o3 IncRNAs and 9,048 transcripts of uncertain coding potential （TUCPs） were *** differentially expressed （DE）TUCPs appear to simultaneously regulate 12 protein-coding genes involved in Eu-rubber biosynthesis （GIEBs）, as well as 95 DE genes. Functional categorization of these 95 DE genes indicated their involvement in subcellular microstructures and cellular processes, such as cell wall, cell division, and growth. These DE genes may participate in the differentiation and development of laticifers, where Eu-rubber is synthesized. A model is proposed in which ＂commanders＂（DE TUCPs） direct the ＂builders＂（DE genes） to construct a ＂storehouse＂ of materials needed for Eu-rubber synthesis, and the ＂workers＂（GIEBs） to synthesize Eu-rubber. These findings provide insights into both cis- and trans-polyisoprene biosynthesis in plants, laying the foundation for additional studies of this crucial process.

关键词： RNA Genome-wide screening of long non-coding RNAs involved in rubber biosynthesis in Eucommia ulmoides Eu

Influences of CeO_(2)morphology on enhanced performance of electro-Fenton for wastewater treatment

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Journal of Rare Earths 2022年第12期40卷 1870-1877,I0002页

作者： jingjing hu Bei Wu Lei Chen Chengcheng Song huifang Yang Fei Long Jie Sun Ru'an Chi hubei Novel Reactor&Green Chemical Technology Key Laboratory Key Laboratory for Green Chemical Process of Ministry of EducationXingfa School of Mining EngineeringWuhan Institute of TechnologyWuhan 430073China Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education Hubei ProvinceCollege of Resource and Environmental ScienceSouth-Central University for NationalitiesWuhan 430074China

As a kind of rare-earth oxide,CeO_(2)has been considered as a great potential material for its abundant oxygen vacancies and catalysis activity in wastewater *** this study,three ceria samples with different morphological structure were prepared,and their effect on contaminates degradation in electro-Fenton(E-Fenton)system was *** is found that the morphology of CeO_(2)has great influence on promoting the performance of E-Fenton *** rod-like CeO_(2)(R-CeO_(2))induced EFenton system shows higher azo dye X3 B removal and mineralization rates than cubs(C-CeO_(2))and octahedrons(O-CeO_(2)),and the degradation kinetic rate constants are 0.28,0.169 and 0.181 min^(-1)respectively,already surpass that of the blank one(0.120 min^(-1)).The H_(2)O_(2)generation capacity of R-CeO_(2)induced E-Fenton system is also superior to the others,and the corresponding Faraday current efficiency even increases to 166.2%at 2.5 *** by scanning-transmission electron microscopy(STEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),electron spin resonance(ESR),Raman spectroscopy were conducted to disclose the mystery behind this *** results indicate that the difference of surface oxygen vacancy density in different shaped CeO_(2)acts as a magic driving force for the accelerated oxygen reduction,and then leads to the enhanced degradation efficiency of E-Fenton *** work provides a new insight into the development and application of rare-earth elements based catalyst in E-Fenton technology.

关键词： CeO_(2) Electro-Fenton Current efficiency Exposed facets H_(2)O_(2) Morphology

MOF-derived spherical Ni_(x)S_(y)/carbon with B-doping enabling high supercapacitive performance

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Journal of Materials Science & Technology 2023年第22期153卷 219-227页

作者： jingjing hu Yan Shi Li Sun Feng Xie Kaiyue Gao Yaru Qu Hankun Tan Yihe Zhang Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China

This work uses a simple Ni-metal organic framework(Ni-MOF)to generate a uniform metal-containing carbon hybrid structure of Ni/C by in-situ ***,after NaBH_(4) treatment and hydrothermal vul-canization of Ni/C,multiphase B-doped Ni_(x)S_(y) nanoparticles can be obtained and uniformly anchored in the carbon skeleton,forming a highly porous flower-shaped B-Ni_(x)S_(y)/C *** positive role of B doping was theoretically confirmed by Density Function Theory(DFT)*** MOF-derived car-bon framework has porous,conductive,and continuous features beneficial for fast charge *** are also multiple Ni-sulfide phases in B-Ni_(x)S_(y)/C,dominated by hexagonal NiS,hexagonal Ni 2 S 3,and cu-bic Ni_(3)S_(4),which give rich valance state and are expected to bring active electrochemical *** addition,the boronation process by the reducing agent of NaBH_(4) is also proved beneficial to bring high capacitance,possibly due to the incorporation of more active sites by ***,the B-Ni_(x)S_(y)/C compos-ite electrode delivers a high specific capacity of 1250.4 C g^(-1) at 1 A g^(-1) and excellent rate *** B-Ni_(x)S_(y)/C-based asymmetric supercapacitor also shows promising prospects for future energy stor-age devices,delivering high cyclability with capacitance retention of 87.6%after 7000 *** work proves the efficiency of MOF-derived carbon framework and B-doping in improving metal sulfide’s electrochemical performances.

关键词： B-Ni_(x)S_(y)/C Carbon skeleton Flower-shaped Hybrid capacitor Asymmetric supercapacitor

Leaching kinetics and permeability of polyethyleneimine added ammonium sulfate on weathered crust elution-deposited rare earth ores

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Journal of Rare Earths 2024年第8期42卷 1610-1619,I0008页

作者： huifang Yang Aoyang Sha Zhengyan He Chenjie Wu Yuanlai Xu jingjing hu Zhigao Xu Ru'an Chi Key Laboratory for Green Chemical Process of Ministry of Education School of Resources&Safety EngineeringWuhan Institute of TechnologyWuhan 430073China Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission College of Resources and Environmental ScienceSouth-Central MinzuUniversityWuhan430074China

At present,in-situ leaching of weathered crust elution-deposited rare earth ores(WCE-DREOs) encounter with problems such as long leaching cycles,slow infiltration rate and low product *** order to solve the above problems,the conventional leaching agent ammonium sulfate((NH_(4))_(2)SO_(4)) was compounded with polymeric surfactant polyethyleneimine(PEI) to form a composite leaching *** effects of leaching temperature,PEI *** rate and pH on leaching kinetics and permeability of rare earths(RE) and aluminum(AI) in orebody were *** is found that with temperature increasing,the time required to reach leaching equilibrium for both RE and Al is shortened,the apparent activation energies of RE and AI are 14.79 and 13.45 kJ/mol,respectively,and the leaching processes are in accordance with the outer diffusion control,When the concentrations of(NH_(4))_(2)SO_(4) and PEI in the composite leaching agent are 2.0 wt% and 0.4 wt%;the time required to reach leaching equilibrium for RE and AI is about 50% shorter than that using(NH_(4))_(2)SO_(4) alone,and the leaching efficiencies of RE are slightly higher than that of *** increasing the temperature and flow rate of the composite leaching agent can improve the leaching efficiencies of RE and Al,but pH has neglected effects on the leaching efficiencies of *** PEI concentrations below 0,4 wt%, the addition of PEI promotes the leaching of RE and *** column leaching studies of the WCE-DREO,the addition of 0.4 wt% PEI to the traditional leaching agent(NH_(4))_(2)SO_(4) has no impact on the leaching efficiencies of ***,it can significantly increase the infiltration rate of WCE-DREO,shortening the leaching time per 10 mL effluent from about 30 min for(NH_(4))_(2)SO_(4) leaching system to 20 min for the composite leaching *** leaching time is shortened by one-third,and the leaching cost is reduced,which can provide theoretical guidance for the development and commercial implementa

关键词： Polyethyleneimine Kinetics Rare earths Permeability Activation energy

Quasi-in-situ study on{10-12}twinning-detwinning behavior of rolled Mg-Li alloy in two-step compression(RD)-compression(ND)process

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Journal of Magnesium and Alloys 2022年第10期10卷 2775-2787页

作者： Biaobiao Yang Chenying Shi Siyu Zhang jingjing hu Jianwei Teng Yujie Cui Yunping Li Akihiko Chiba State Key Lab for Powder Metallurgy Central South UniversityChangsha 410083China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan

Twinning-detwinning(TDT)behavior in a strongly basal-textured Mg-Li alloy during two-step compression(RD)-compression(ND)process was investigated using quasi-in-situ *** behavior and TDT variants selection were statistically discussed with the loading path for the first ***-Schmid twinning behavior was observed in the first step compression,owing to the local stress fluctuations by neighboring twins;in contrast,Schmid’s law well predicted the detwinning variants *** asymmetrical TDT behavior was first investigated to date related with the strong basal texture and loading ***,with the progress of compression,Schmid factors for twinning demonstrated a decreasing tendency;however,those for detwinning during the second step displayed an abnormally increasing trend,fundamentally stemming from prior twinning behavior.

关键词： Twinning-detwinning Mg-Li alloy Quasi-in-situ Biaxial loading