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Theory and practice for assessing structural integrity and dynamical integrity of high-speed trains

Railway Sciences 2024年第2期3卷 113-127页

作者： Weihua Zhang Yuanchen Zeng Dongli Song Zhiwei Wang State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengduChina School of Mechanical Engineering Southwest Jiaotong UniversityChengduChina

Purpose–The safety and reliability of high-speed trains rely on the structural integrity of their components and the dynamic performance of the entire vehicle *** paper aims to define and substantiate the assessment of the structural integrity and dynamical integrity of high-speed trains in both theory and *** key principles and approacheswill be proposed,and their applications to high-speed trains in Chinawill be ***/methodology/approach–First,the structural integrity and dynamical integrity of high-speed trains are defined,and their relationship is ***,the principles for assessing the structural integrity of structural and dynamical components are presented and practical examples of gearboxes and dampers are ***,the principles and approaches for assessing the dynamical integrity of highspeed trains are presented and a novel operational assessment method is further ***–Vehicle system dynamics is the core of the proposed framework that provides the loads and vibrations on train components and the dynamic performance of the entire vehicle *** assessing the structural integrity of structural components,an open-loop analysis considering both normal and abnormal vehicle conditions is *** assessing the structural integrity of dynamical components,a closed-loop analysis involving the influence of wear and degradation on vehicle system dynamics is *** analysis of vehicle system dynamics should follow the principles of complete objects,conditions and ***,experimental and operational approaches should be combined to achieve effective ***/value–The practical applications demonstrate that assessing the structural integrity and dynamical integrity of high-speed trains can support better control of critical defects,better lifespan management of train components and better maintenance decision-making for high-speed trains.

关键词： structural integrity Dynamical integrity Vehicle system dynamics High-speed trains Bogie integrity assessment Fatigue

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An emerging role of arecoline on growth performance,intestinal digestion and absorption capacities and intestinal structural integrity of adult grass carp(Ctenopharyngodon idella)

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Animal Nutrition 2023年第4期15卷 173-186页

作者： Na Yao Lin Feng Weidan Jiang Pei Wu Hongmei Ren Hequn Shi Ling Tang Shuwei Li Caimei Wu Hua Li Yang Liu Xiaoqiu Zhou Animal Nutrition Institute Sichuan Agricultural UniversityChengdu611130China Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province Sichuan Agricultural UniversityChengdu611130SichuanChina Key Laboratory of Animal Disease-Resistance Nutrition Ministry of EducationMinistry of Agriculture and Rural AffairsKey Laboratory of Sichuan ProvinceSichuan611130China Guangzhou Cohoo Biotech Co. Ltd.Guangzhou510663China Animal Nutrition Institute Sichuan Academy of Animal ScienceSichuan Animtech Feed Co.LtdChengdu610066SichuanChina

Arecoline is an alkaloid with important pharmacological effects in the plant areca nut,which has been demonstrated to be an agonist of muscarinic receptors(M receptor).This study explored the influences of dietary arecoline on growth performance,intestinal digestion and absorption abilities,antioxidant capacity,and the apical junction complex(AJC)of adult grass carp(Ctenopharyngodon idella).Adult grass carp(608to 1512 g)were fed at 6 graded levels of dietary arecoline(0,0.5,1.0,1.5,2.0,and 2.5 mg/kg diet)for *** results suggested that appropriate dietary supplementation of arecoline(1.0 mg/kg)increased growth parameters and intestinal growth in adult grass carp(Pstructural integrity in fish and evaluated the appropriate level of supplementation.

关键词： Arecoline Ctenopharyngodon idella Digestion capacity Absorption capacity structural integrity Intestine

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structural integrity Analysis of Containers Lost at Sea Using Finite Element Method

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Sustainable Marine Structures 2022年第2期4卷 11-17页

作者： Selda Oterkus Bingquan Wang Erkan Oterkus Yakubu Kasimu Galadima Margot Cocard Stefanos Mokas Jami Buckley Callum McCullough Dhruv Boruah Bob Gilchrist PeriDynamics Research Centre Department of Naval ArchitectureOcean and Marine EngineeringUniversity of StrathclydeGlasgowUK Buckley Yacht Design Ltd New MiltonUK M Subs Limited PlymouthUK Oceanways Technologies Ltd LondonUK

Unlike traditional transportation,container transportation is a relatively new logistics transportation *** containers lost at sea have raised safety *** this study,finite element analysis of containers subjected to hydrostatic pressure,using commercial software ANSYS APDL was performed.A computer model that can reasonably predict the state of an ISO cargo shipping container was *** von Mises stress distribution of the container was determined and the yield strength was adopted as the failure *** investigations showed that the conventional ship container cannot withstand hydrostatic pressure in deep water conditions.A strengthened container option was considered for the container to retain its structural integrity in water conditions.

关键词： Container Finite element method structural integrity Sea

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Effect of Stratum on the Interfacial Stress and structural integrity of Cement Sheath

Effect of Stratum on the Interfacial Stress and Structural I...

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作者： Jingfu Zhang Jiancheng Wang Shuting Wang Shuai Shao Wenhui Xiao Ziyang Lin Enhanced Oil and Gas Recovery Key Laboratory Ministry of Education Northeast Petroleum University

In order to determine the method of protecting the cement sheath structural integrity in oil and gas wells, the finite element mechanics models of the Casing-Cement sheath-Stratum Combination Body（CCSCB） were established based on different stratum action mechanism. The effect of stratum type, well depth, crustal stress and stratum elastic modulus on the interface stress and structural integrity of cement sheath were researched. The results show that, in the creep stratum, the interface contact pressure of cement sheath increase and the circumferential stresses reduce with the increase of crustal stress. There is no effect of the crustal stress on the interface stress in the elastic and rigid stratum. In elastic stratum and low crustal stress creep stratum, circumferential tensile stress would be generated at cement sheath when loading. The cement sheath is easy to crack by this tensile stress and the structural integrity is destroyed when the load was higher. The effect of stratum elastic modulus on the interface stress is related to the stratum and stress type. There is no influence of the elastic modulus on the interface stresses in the rigid stratum. The influence of the elastic modulus on the interface contact pressure is obvious in the elastic stratum, and the effect on the circumferential stress is obvious in the creep stratum.

关键词： creep stratum elastic stratum rigid stratum cement sheath structural integrity

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The hydraulic performance and structural integrity of A-Jack armour layer

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水道港口 2010年第5期31卷 319-319页

作者： William G.McDougal University of Florida

A-Jacks are concrete armor units that are used in both open channel and coastal *** open channel applications,they are used for bank and toe protection,flow and grade control,bridge pier scour protection,energy dissipation,and *** small units may be fabricated in standard block *** coastal applications,A-Jacks are used in breakwaters,jetties,revetments,and habitat *** units are generally much larger and more robust than the small open channel *** paper focuses on coastal applications and in particular,combines results on three topics:(1)recent hydraulic model studies,(2)alternative fabrication methods,and(3)bundle placement construction *** models studies were conducted that examined the standard random and uniform placement methods,and also the bundle placement *** bundle placement,3~20 A-Jacks are banded together,lifted with a spreader bar,and placed as a single crane *** significantly decreases installation time during *** also provides a more hydraulically stable placement *** hydraulic model tests examined the bundle stability in random waves for cases where the binding remains in tack and is *** geometry of A-Jacks enables a variety of fabrication *** option is to fabricate the A-Jacks as two pieces using flat forms and then grout the two pieces *** forms may be used in conventional block machines for A-Jacks sizes up to 1.3 *** sizes may be wet cast in flat forms or gang *** A-Jacks geometry has been recently modified to increase grouting efficient and *** A- Jacks may also be cast in a single piece using 'clam shell' type forms.

关键词： A-Jack armour layer hydraulic performance structural integrity

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Three-phase Enriched Environment Improves Post-stroke Gait Dysfunction via Facilitating Neuronal Plasticity in the Bilateral Sensorimotor Cortex:A Multimodal MRI/PET Analysis in Rats

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Neuroscience Bulletin 2024年第6期40卷 719-731页

作者： Yun Lu Ziyue Lin Mingcong Li Yuming Zhuang Binbin Nie Jianfeng Lei Yuanyuan Zhao Hui Zhao School of Traditional Chinese Medicine Capital Medical UniversityBeijing100069China Beijing Key Lab of TCM Collateral Disease Theory Research Beijing100069China Beijing Engineering Research Center of Radiographic Techniques and Equipment Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China Medical Imaging Laboratory of Core Facility Center Capital Medical UniversityBeijing100069China

The three-phase Enriched Environment(EE)paradigm has been shown to promote post-stroke functional improvement,but the neuronal mechanisms are still *** this study,we applied a multimodal neuroimaging protocol combining magnetic resonance imaging(MRI)and positron emission tomography(PET)to examine the effects of post-ischemic EE treatment on structural and functional neuroplasticity in the bilateral sensorimotor *** were subjected to permanent middle cerebral artery *** motor function of the rats was examined using the DigiGait *** was applied to investigate the EE-induced structural modifications of the bilateral sensorimotor cortex.[^(18)F]-fluorodeoxyglucose PET was used to detect glucose *** oxygen level-dependent(BOLD)-functional MRI(fMRI)was used to identify the regional brain activity and functional connectivity(FC).In addition,the expression of neuroplasticity-related signaling pathways including neurotrophic factors(BDNF/CREB),axonal guidance proteins(Robo1/Slit2),and axonal growth-inhibitory proteins(NogoA/NgR)as well as downstream proteins(RhoA/ROCK)in the bilateral sensorimotor cortex were measured by Western *** results showed the three-phase EE improved the walking *** T2 mapping imaging and diffusion tensor imaging demonstrated that EE benefited structure integrity in the bilateral sensorimotor ***-MRI fused images showed improved glucose metabolism in the corresponding regions after EE ***,the BOLD-based amplitude of low-frequency fluctuations showed that EE increased spontaneous activity in the bilateral motor cortex and ipsilateral sensory *** addition,FC results showed increased sensorimotor connectivity in the ipsilateral hemisphere and increased interhemispheric motor cortical connectivity and motor cortical-thalamic connectivity following EE *** addition,a strong correlation was found between increased functional connectivity and improv

关键词： Enriched environment Gait function Neuronal plasticity structural integrity Glucose metabolism Functional connectivity Microenvironmental molecules Axonogenesis

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Effect of cold-working on corrosion induced damage in lug joints

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Defence Technology（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath M.N Chikmath L. Murthy H. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring heavy loads to parent components in aerospace *** experience corrosion due to environmental conditions,improper surface finishes and rubbing displacement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is modelled as a through-pit at one of the identified critical locations through stress *** effect of this pit on fatigue crack initiation life is ***-hole is pre-stressed by cold-working and the benefits of inducing plastic wake on the intended performance of the lug joint during the damages due to corrosion are brought out and compared with non-cold-worked *** analysis is performed on this lug joint with *** results obtained highlight the benefits of cold-working and the methodology can be extended to damage growth and analyse the effect of surface treatments for better structural integrity of components of aerospace vehicles.

关键词： Lug joint Corrosion Crack initiation Cold-working structural integrity

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Freestanding MoSe_(2)nanoflowers for superior Li/Na storage properties

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Tungsten 2024年第1期6卷 238-247页

作者： Qiao Cu Chao-Qun Shang Guo-Fu Zhou Xin Wang Guangdong Provincial Key Laboratory of Optical Information Materials South China Normal UniversityGuangzhou 510006China School of Materials Science and Engineering and Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of TechnologyWuhan 430205China International Academy of Optoelectronics at Zhaoqing South China Normal UniversityZhaoqing 526060China

MoSe_(2),with high theoretical specific capacity,has attracted a lot of *** remains an open challenge to effectively suppress the irreversible selenium dissolution and rapid capacity decrease induced by severe volume change during ***,we synthesize MoSe_(2)nanoflowers dispersed on one-dimensional(1D)N-doped carbon nanofibers(MoSe_(2)@NCNFs)for use as a freestanding *** this unique structure,the 1D N-doped carbon nanofibers are found to not only enhance the conductivity but also ensure the structural integrity during the Li^(+)/Na^(+)insertion/destraction *** expected,at 2 A·g^(-1),the specific capacity of the MoSe_(2)@NCNFs is maintained at 180 mAh·g^(-1)after 500 cycles when used in lithium storage ***,in the case of sodium storage,at 1 A·g^(-1),the MoSe_(2)@NCNFs shows a capacity of 122mAh·g^(-1)after 500 *** findings suggest that the MoSe_(2)@NCNF electrodes may be a promising candidate for use in reversible Li/Na storage applications.

关键词： Li/Na storage Freestanding electrode MoSe_(2) Electrochemical reaction kinetics structural integrity

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Reducing structural degradation of high-voltage single-crystal Ni-rich cathode through in situ doping strategy

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Rare Metals 2023年第9期42卷 2993-3003页

作者： Xin-Ming Fan Zhi Zhang Gao-Qiang Mao Ying-Jie Tong Ke-Bo Lin Hui Tong Wei-Feng Wei Qing-Hua Tian Xue-Yi Guo Powder Metallurgy Research Institute Central South UniversityChangsha410083China School of Metallurgy and Environment Central South UniversityChangsha410083China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha410083China College of Chemistry and Materials Engineering Hunan University of Arts and ScienceChangde415000China

Polycrystalline Ni-rich layered oxide (Li Ni_(x)Co_(y)Mn_zO_(2)(NCM),x>0.8) cathode material with high specific capacity and low cost is considered as one of the most promising candidate materials for lithium-ion batteries (LIBs).However,it suffers from severe structural and capacity degradation during practical cycling,especially under harsh operation condition(ultrahigh cutoff voltage and elevated temperature,etc.).One promising approach to mitigate these issues is to develop a single-crystal Ni-rich NCM cathode,which could enhance structural integrity and improve capacity retention,due to its robust and stable micro-sized primary ***,the improved cyclic stability comes at the expense of reversible capacity and rate capability,owing to the relatively low Li^(+) diffusion efficiency for its micron-sized primary ***,the structural degradation and exacerbation of interfacial reactions for the Ni-rich NCM cathode under highvoltage (≥4.5 V) would quickly trigger the poor electrochemical performance,limiting its practical ***,Li Ni_(0.827)Co_(0.11)Zr_(0.003)Mn_(0.06)O_(2)(Zr@SC-N_(83)) cathode material was successfully synthesized via the in situ doping *** could not only effectively maintain the reversibility of phase transition between H2 and H3 after long-term cycling at high voltage (4.6 V),but also enhance lithium-ion diffusion,thus improving the cycling performance and good rate performance for the Zr@SC-N_(83)*** a result,0.3 wt%Zrdoping cathode delivers an initial discharging capacity of 200.1 m Ah·g^(-1)at 1.0C and at the high cutoff voltage of 4.6 V,exhibiting the satisfactory capacity retention of 85.5%after *** provides an effective route toward low-cost and higher energy density for lithium-ion batteries with Ni-rich cathode.

关键词： Single-crystal Ni-rich LiNi_(x)Co_(y)Mn_zO_(2)(NCM) In situ doping strategy High voltage structural integrity Cycling stability

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Covalent stabilization of DNA nanostructures on cell membranes for efficient surface receptor-mediated labeling and function regulations

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Science China Chemistry 2022年第11期65卷 2327-2334页

作者： Dandan Chao Xuemei Xu Yanyan Miao Linlin Yang Qianqian Gao Rui Xu Yuan Tian Yumeng Zhao Yuzhen Du Da Han Institute of Molecular Medicine Shanghai Key Laboratory for Nucleic Acid Chemistry and NanomedicineState Key Laboratory of Oncogenes and Related GenesRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China Department of Laboratory Medicine Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200127China

One major challenge of using DNA nanostructures for cellular and in vivo applications is their insufficiently structural integrity that stems from the non-covalent base pairing and stacking in complex cellular and physiological environment. The establishment of covalent bonds in DNA nanostructures can link individual strands more stably and therefore should improve the performance of DNA nanostructures in different scenarios where structural integrity is required. Here, we developed a convenient and effective method for constructing covalently stabilized DNA nanostructures by chemically inserting photo-crosslinker(^(CNV)K) in DNA sequences. These covalently linked DNA nanostructures were found to be more resistant to external interference, such as low cation concentrations and unspecific displacement on cell membranes. We also demonstrated that our strategy could improve the efficiency of cell surface receptor-mediated labeling and function regulations in living cells, which sheds light on broadening the biomedical applications of DNA nanostructures.

关键词： DNA nanostructures covalent stabilization structural integrity cell labeling surface receptor regulation

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