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Discrete element modeling and verification of the simulation parameters for chopped hybrid Broussonetia papyrifera stems

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 23-32页

作者： Caiwang Peng Junwei Chen xi He Songlin Sun yulong Yin Zhong Chen College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China College of Animal Science and Technology Hunan Agricultural UniversityChangsha 410128China Rongcheng gouyang Modern Agriculture(Chongqing)Co. LtdChongqing 500153China

In this study,the discrete element software EDEM was applied to establish a simulation model of non-uniform-sized particle units for Broussonetia papyrifera stalks,which aimed to address the low utilization rate of existing Broussonetia papyrifera harvesting machinery,the significant variation between the simulated model of Broussonetia papyrifera stalks and their actual appearance,as well as the absence of contact parameter *** a combination of the free-fall collision method,inclined plane sliding method,and inclined plane rolling method,numerical simulation was conducted to analyze the pattern of variations in contact parameters between Broussonetia papyrifera stalks and the steel material of the ***,these parameters were *** results showed that the coefficient of restitution between Broussonetia papyrifera stalks and steel materials was 0.321,the static friction factor was 0.589,and the rolling friction factor was *** the parameters of contact between Broussonetia papyrifera stalks as variables and the experimentally measured pile angle as the objective of optimization,the steepest ascent experiment and the three-factor five-level rotation combination experiment were *** this way,a second-order response model was constructed to analyze the relationship between the contact parameters and the pile *** the optimization analysis of experimental data,it was determined that the coefficient of restitution between Broussonetia papyrifera stalks was 0.21,the static friction factor was 0.24,and the rolling friction factor was ***,the calibration results were validated through experimentation to show that the relative error between the obtained pile angle under the context of optimal parameter combination and the actual one was 4.11%.In addition,the relative error of mass flow rate in spiral transport was within a reasonable range,this study lays a foundation both theoretically and statistic

关键词： hybrid Broussonetia papyrifera stem discrete element method repose angle contact parameters calibration

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Comprehensive Analysis of the Role of Forkhead Box J3(FOXJ3)in Human Cancers

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Wuhan University Journal of Natural Sciences 2024年第1期29卷 74-84页

作者： YANg Yang LI yulong WANg xiaoli School of Public Health Shaanxi University of Chinese MedicineXianyang 712046ShaanxiChina Department of gastroenterology Shaanxi Provincial People's hospitalXi'an 710068ShaanxiChina Department of Dermatology Affiliated Hospital of Shaanxi University of Chinese MedicineXianyang 712000ShaanxiChina

Forkhead box J3(FOXJ3)is a member of the forkhead box(Fox)***,increasing evidence has revealed the relationship between Fox family members and ***3 is involved in various types of cancer,including lung cancer,tongue squamous carcinoma,and prostate cancer;however,a comprehensive pan-cancer analysis of FOXJ3 remains ***,we explored the function of FOXJ3 across cancers using online websites and databases including TIMER2.0,Sanger Box,UALCAN,gEPIA2.0,c Bio Portal,CancerSEA,STRINg,Bio gRID and Metascape to analyze the role of FOXJ3 in *** expression of FOXJ3 was found in various *** genetic alteration percentage in tumors was determined,and elevated FOXJ3 expression was found to be associated with worse overall survival in brain lower grade glioma(Lgg),liver hepatocellular carcinoma(LIHC),sarcoma(SARC)and thyroid *** FOXJ3 expression was related to worse prognosis with disease-free survival in adrenocortical carcinoma,Lgg and ***3 expression was related to immune infiltration in several *** analysis showed that histone modification,the TgF-βsignaling pathway,and chromatin organization were the top three enriched ontology clusters of the top 100 similar genes of *** pancancer analysis provides comprehensive insights into FOXJ3 from the perspective of bioinformatics in different cancers,where it serves as a potential biomarker for prognosis,especially in Lgg and ***3 is also correlated with immune infiltrates in certain human tumors.

关键词： FOXJ3 cancer genetic alteration prognosis

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Impact damage testing based on high-speed continuous water jet aircraft coatings

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Chinese Journal of Aeronautics 2024年第10期37卷 249-264页

作者： Minggong SHA Ying SUN Yutong LI Yiming LIU gregory FEDOTENKOV Lev RABINSKIY Arseniy BABAYTSEV yulong LI School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710072China Joint International Research Laboratory of Impact Dynamics and Engineering Application Xi’an 710072China Shaanxi Impact Dynamics and Engineering Application Laboratory Xi’an 710072China NPU Yangzi River Delta Research Institute Suzhou 215400China Moscow Aviation Institute(National Research University) Moscow 125993Russia

When an aircraft passes through a rainy area at high speed,the coating on the front edge of the fuselage will be continuously eroded by raindrops,causing the coating to wear,crack or even peel *** paper uses carbon fiber T300 material as the base material,and at the different impact speeds and impact numbers,water cutting equipment was used to simulate the erosion of the coating caused by the continuous impact of water *** damage morphology of samples at different damage stages was observed by digital microscope and Scanning Electron Microscope(SEM),and the damage evolution curve was established to analyze and reveal the damage behavior and damage mechanism of rain *** results show that the degree of damage experienced an increasing trend with the increase of impact numbers and speed,until circular peel damage was formed;no damage occurred during the incubation period,and the curvature of the damage evolution curve increased significantly after the expansion period and eventually showed a stable expansion *** mechanical properties of the coating material were the main influencing factors of its rain corrosion ***,the axially symmetric unsteady contact problem of droplets impacting the surface of a solid deformable body was *** the contact area was determined based on the iterative algorithm boundary positioning method.A mathematical model and closed mathematical formula describing the unsteady interaction between a droplet and a solid deformable obstacle were proposed.

关键词： Rain erosion damage Liquid-solid impact Multiple jets Composite materials Impact dynamics

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Robust and Trustworthy Data Sharing Framework Leveraging On-Chain and Off-Chain Collaboration

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Computers, Materials & Continua 2024年第2期78卷 2159-2179页

作者： Jinyang Yu xiao Zhang Jinjiang Wang Yuchen Zhang yulong Shi Linxuan Su Leijie Zeng School of Computer Science Northwestern Polytechnical UniversityXi’an710072China MIIT Key Laboratory of Big Data Storage and Management Northwestern Polytechnical UniversityXi’an710072China National Engineering Laboratory for Integrated Aero-Space-ground-Ocean Big Data Application Technology Northwestern Polytechnical UniversityXi’an710072China

The proliferation of Internet of Things(IoT)systems has resulted in the generation of substantial data,presenting new challenges in reliable storage and trustworthy *** distributed storage systems are hindered by centralized management and lack traceability,while blockchain systems are limited by low capacity and high *** address these challenges,the present study investigates the reliable storage and trustworthy sharing of IoT data,and presents a novel system architecture that integrates on-chain and off-chain data manage *** architecture,integrating blockchain and distributed storage technologies,provides high-capacity,high-performance,traceable,and verifiable data storage and *** on-chain system,built on Hyperledger Fabric,manages metadata,verification data,and permission information of the raw *** off-chain system,implemented using IPFS Cluster,ensures the reliable storage and efficient access to massive files.A collaborative storage server is designed to integrate on-chain and off-chain operation interfaces,facilitating comprehensive data *** provide a unified access interface for user-friendly system *** testing validates the system’s reliability and stable *** proposed approach significantly enhances storage capacity compared to standalone blockchain *** reliability tests consistently yield positive *** average upload and download throughputs of roughly 20 and 30 MB/s,respectively,the system’s throughput surpasses the blockchain system by a factor of 4 to 18.

关键词： On-chain and off-chain collaboration blockchain distributed storage system hyperledger fabric IPFS cluster

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Wear-resistant CoCrNi multi-principal element alloy at cryogenic temperature

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Science Bulletin 2024年第2期69卷 227-236页

作者： Yue Ren Qing Zhou Dongpeng Hua Zhuobin Huang yulong Li Qian Jia Peter gumbsch Christian greiner Haifeng Wang Weimin Liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Institute for Applied Materials Karlsruhe Institute of TechnologyKarlsruhe 76131Germany IAM-ZM MicroTribology CenterμTC Karlsruhe Institute of TechnologyKarlsruhe 76131Germany Fraunhofer IWM Freiburg 79108Germany State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Traditional high strength engineering alloys suffer from serious surface brittleness and inferior wear performance when servicing under sliding contact at cryogenic ***,we report that the recently emerging CoCrNi multi-principal element alloy defies this trend and presents dramatically enhanced wear resistance when temperature decreases from 273 to 153 K,surpassing those of cryogenic austenitic *** temperature-dependent structure characteristics and deformation mechanisms influencing the cryogenic wear resistance of CoCrNi are clarified through microscopic observation and atomistic *** is found that sliding-induced subsurface structures show distinct scenarios at different deformation *** cryogenic condition,significant grain refinement and a deep plastic zone give rise to an extended microstructural gradient below the surface,which can accommodate massive sliding deformation,in direct contrast to the strain localization and delamination at 273 ***,the temperature-dependent cryogenic deformation mechanisms(stacking fault networks and phase transformation)also provide additional strengthening and toughening of the subsurface *** features make the CoCrNi alloy particularly wear resistant at cryogenic conditions and an excellent candidate for safety–critical applications.

关键词： Multi-principal element alloy Cryogenic temperature Wear CoCrNi

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Photoredox catalytic alkylarylation of alkynes with arylsulfonylacetate as bifunctional reagent

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Science China Chemistry 2024年第6期67卷 2022-2028页

作者： Chonglong He Min Wang yulong Wang Lirong Zhao Youkang Zhou Keyuan Zhang Shenyu Shen Yaqiong Su xin-Hua Duan Le Liu School of Chemistry Engineering Research Center of Energy Storage Materials and DevicesMinistry of EducationXi’an Key Laboratory of Sustainable Energy Material ChemistryXi’an Jiaotong UniversityXi’an710049China

Difunctionalization of alkynes represents a powerful and straightforward approach to the synthesis of complex ***,the radical difunctionalization of alkynes mediated by bifunctional reagents remains challenging and underexplored,despite significant progress having been made in alkene ***,we report a novel arylsulfonylacetate skeleton in which aryl rings are attached to acetates through SO_(2),serving as a powerful bifunctional reagent for the alkylarylation of alkynes via vinyl-radical intermediate under photoredox *** modular bifunctional reagent enables the simultaneous incorporation of a wide range of functional groups,including(hetero)aryl ring and alkyl carboxylate into alkynes,resulting in synthetically valuable all-carbon tetrasubstituted alkene *** transformation is distinguished by its redox-neutral nature,readily accessible starting materials,compatibility with diverse functional groups and its capacity to facilitate convergent *** utility of this approach was further demonstrated by the late-stage functionalization of complex molecules and the preparation of fluorescent molecules and anti-cancer drugs.

关键词： bifunctional reagent photoredox catalysis Smiles rearrangement alkylarylation tetrasubstituted acyclic all-carbon olefins

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Treatment with β-sitosterol ameliorates the effects of cerebral ischemia/reperfusion injury by suppressing cholesterol overload, endoplasmic reticulum stress, and apoptosis

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Neural Regeneration Research 2024年第3期19卷 642-649页

作者： xiuling Tang Tao Yan Saiying Wang Qingqing Liu Qi Yang Yongqiang Zhang Yujiao Li Yumei Wu Shuibing Liu yulong Ma Le Yang Precision Pharmacy&Drug Development Center Department of PharmacyTangdu HospitalAir Force Medical UniversityXi’anShaanxi ProvinceChina Department of Clinical Pharmacy Jinling HospitalMedical School of Nanjing UniversityNanjingJiangsu ProvinceChina Department of Pharmacology School of PharmacyAir Force Medical UniversityXi’anShaanxi ProvinceChina Department of Anesthesiology The First Medical Center of Chinese PLA General HospitalBeijingChina Department of Anatomy Histology and Embryology and K.K.Leung Brain Research CentreAir Force Medical UniversityXi’anShaanxi ProvinceChina

β-Sitosterol is a type of phytosterol that occurs naturally in *** studies have shown that it has anti-oxidant,anti-hyperlipidemic,anti-inflammatory,immunomodulatory,and anti-tumor effects,but it is unknown whetherβ-sitosterol treatment reduces the effects of ischemic *** we found that,in a mouse model of ischemic stroke induced by middle cerebral artery occlusion,β-sitosterol reduced the volume of cerebral infarction and brain edema,reduced neuronal apoptosis in brain tissue,and alleviated neurological dysfunction;moreover,β-sitosterol increased the activity of oxygen-and glucose-deprived cerebral cortex neurons and reduced *** investigation showed that the neuroprotective effects ofβ-sitosterol may be related to inhibition of endoplasmic reticulum stress caused by intracellular cholesterol accumulation after ischemic *** addition,β-sitosterol showed high affinity for NPC1L1,a key transporter of cholesterol,and antagonized its *** conclusion,β-sitosterol may help treat ischemic stroke by inhibiting neuronal intracellular cholesterol overload/endoplasmic reticulum stress/apoptosis signaling pathways.

关键词： apoptosis blood-brain barrier β-sitosterol cerebral ischemia/reperfusion injury cholesterol overload cholesterol transport endoplasmic reticulum stress ischemic stroke molecular docking NPC1L1

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基于场致应变的钛酸铋钠基压电纤维复合材料性能研究

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中南大学学报（自然科学版） 2024年第8期55卷 2857-2866页

作者：陈宇龙汤林袁晰罗行张斗中南大学粉末冶金研究院湖南长沙410083 中南大学化学化工学院湖南长沙410083

基于钛酸铋钠基无铅陶瓷制备压电纤维复合材料,并研究BNT基压电陶瓷纤维体积分数对复合材料的影响。研究结果表明:随压电陶瓷体积分数的增加,自由应变和顶端位移增大;当压电陶瓷体积分数为81.40%时,在0~1500 V正弦电压激励下,自由应变... 详细信息

基于钛酸铋钠基无铅陶瓷制备压电纤维复合材料,并研究BNT基压电陶瓷纤维体积分数对复合材料的影响。研究结果表明:随压电陶瓷体积分数的增加,自由应变和顶端位移增大;当压电陶瓷体积分数为81.40%时,在0~1500 V正弦电压激励下,自由应变和顶端位移最大分别达到543×10^(-6)和14.92 mm;在循环寿命实验中,经历1.0×10^(6)次循环后性能依然稳定,具有优异的耐疲劳性能,作为柔性驱动器应用前景广阔。

关键词：压电纤维复合材料钛酸铋钠场致应变驱动性能

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Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse

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Chinese Physics B 2024年第3期33卷 433-440页

作者：王源李玉龙乔月高娜郭福明陈洲赫兰海杨玉军赵曦王俊 Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy Jilin UniversityChangchun 130012China Beijing Institute of Space Launch Technology Beijing 100076China School of Physics and Information Technology Shaanxi Normal UniversityXi'an 710062China

We delve into the phenomenon of high-order harmonic generation within a helium atom under the influence of a plasmon-assisted shaping *** findings reveal an intriguing manipulation of the frequency peak position in the harmonic emission by adjusting the absolute phase parameter within the frequency domain of the shaping *** phenomenon holds potential significance for experimental setups necessitating precisely tuned single ***,we observe a modulated shift in the created harmonic photon energy,spanning an impressive range of 1.2 *** frequency peak shift is rooted in the asymmetry exhibited by the rising and falling edges of the laser pulse,directly influencing the position of the peak frequency *** study quantifies the dependence of this tuning range and the asymmetry of the laser pulse,offering valuable insights into the underlying mechanisms driving this ***,our investigation uncovers the emergence of semi-integer order harmonics as the phase parameter is *** attribute this discovery to the intricate interference between harmonics generated by the primary and secondary return *** observation introduces an innovative approach for generating semi-integer order harmonics,thus expanding our understanding of high-order harmonic ***,our work contributes to the broader comprehension of complex phenomena in laser-matter interactions and provides a foundation for harnessing these effects in various applications,particularly those involving precise spectral control and the generation of unique harmonic patterns.

关键词： high-order harmonic semi-integer-order spectra shift inhomogeneous field

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基于单电流传感器的改进相电流重构技术

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电力自动化设备 2024年第6期44卷 96-101页

作者：徐航肖曦谢玉龙王潇曾萍刘志刚清华大学电机工程与应用电子技术系北京100080 国网江西省电力有限公司吉安供电分公司江西吉安343000

在电机闭环控制过程中,电流传感器故障、不同电流传感器的不一致性等因素可能导致系统失稳。为提高系统的容错能力,减小故障对控制系统稳定性的影响,提出一种基于单电流传感器的改进相电流重构技术。通过移动脉宽调制的脉冲矢量来消除... 详细信息

在电机闭环控制过程中,电流传感器故障、不同电流传感器的不一致性等因素可能导致系统失稳。为提高系统的容错能力,减小故障对控制系统稳定性的影响,提出一种基于单电流传感器的改进相电流重构技术。通过移动脉宽调制的脉冲矢量来消除母线电流采样盲区,进而通过母线电流重构获得三相电流。相比于传统电流重构方法,所提改进方法重构的电流更接近真实电流值,能够减小电流总谐波,降低电磁转矩脉动,提升系统的稳态性能。通过仿真和实验对比2种重构方法,证明了所提改进方法的优势。结果表明所提改进方法能有效实现电流重构,提升系统稳态性能。

关键词：母线电流相电流重构脉冲移位单电流传感器电流信号采样矢量合成

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