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环状悬挑钢结构整体提升过程中局部失效研究

广西大学学报（自然科学版） 2024年第3期49卷 464-474页

作者：高东阳路国运冯凌斐杨会伟郑芳俊李宏武太原理工大学土木工程学院山西太原030024 土木工程防灾与控制山西省重点实验室山西太原030024 山西建筑工程集团有限公司山西太原030024

以北疆明珠塔旋转餐厅提升为例,通过有限元分析软件ABAQUS构建北疆明珠塔有限元模型,利用“生死单元”技术模拟不同位置构件失效,分析不同形式的局部构件失效对提升过程中旋转餐厅受力性能的影响规律,并通过现场实测数据验证了有限元模... 详细信息

以北疆明珠塔旋转餐厅提升为例,通过有限元分析软件ABAQUS构建北疆明珠塔有限元模型,利用“生死单元”技术模拟不同位置构件失效,分析不同形式的局部构件失效对提升过程中旋转餐厅受力性能的影响规律,并通过现场实测数据验证了有限元模型的可靠性。结果表明:吊点处附近构件单独失效对结构应力和位移影响较大。且构件被完全提起前,构件失效越晚,构件失效前应力越大,结构动力响应越明显;此外,不同种构件同时失效对结构的影响大于单根构件失效影响的叠加,不相连同种构件同时失效对结构的影响大于相连同种构件同时失效,且影响程度随着失效构件之间距离的增加而减小。

关键词：高耸结构整体提升构件失效 ABAQUS软件生死单元

车用增压发动机进气系统水冷中冷器CFD分析及结构优化

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小型内燃机与车辆技术 2024年第1期53卷 36-39,45页

作者：芦俊洁王芳君刘昭辉陈柄林宁波吉利罗佑发动机零部件有限公司浙江宁波315336

一种车用增压发动机通用的进气系统中,水冷中冷器的进气方向和散热器的散热铜管轴向之间的夹角接近90°。为了避免在散热器中出现热应力集中现象,提高散热效率,需提高高温气体在散热铜管内的分布均匀性。提出了一种评估散热器内气体分... 详细信息

一种车用增压发动机通用的进气系统中,水冷中冷器的进气方向和散热器的散热铜管轴向之间的夹角接近90°。为了避免在散热器中出现热应力集中现象,提高散热效率,需提高高温气体在散热铜管内的分布均匀性。提出了一种评估散热器内气体分布均匀性的评价方法,利用CFD仿真软件对水冷中冷器进行了分析;通过在中冷器的进气室内加装导流板,对水冷中冷器结构进行了优化。结果表明,结构优化后的水冷中冷器,其散热器内的气体分布均匀性偏差从23%降低到了4.85%,提高了散热器的散热性能。

关键词：水冷中冷器均匀性评价标准

Review of X-ray pulsar spacecraft autonomous navigation

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Chinese Journal of Aeronautics 2023年第10期36卷 44-63页

作者： Yidi WANG Wei ZHENG Shuangnan ZHANG Minyu GE Liansheng LI Kun JIANG Xiaoqian CHEN Xiang ZHANG Shijie ZHENG fangjun lu College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410073China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Beijing Institute of Control Engineering Beijing 100080China Beijing Institute of Tracking and Communication Technology Beijing 100091China Aerospace Information Research Institute Chinese Academy of ScienceBeijing 100091China Academy of Military Science Beijing 100091China National Innovation Institute of Defense Technology Academy of Military ScienceBeijing 100091China

This article provides a review on X-ray pulsar-based navigation(XNAV).The review starts with the basic concept of XNAV,and briefly introduces the past,present and future projects concerning *** paper focuses on the advances of the key techniques supporting XNAV,including the navigation pulsar database,the X-ray detection system,and the pulse time of arrival ***,the methods to improve the estimation performance of XNAV are ***,some remarks on the future development of XNAV are provided.

关键词： Estimation of pulse time of arrival Spacecraft autonomous navigation X-ray detection X-ray pulsar-based navigation X-ray pulsar signal processing

Effect of orthokeratology on precision and agreement assessment of a new sweptsource optical coherence tomography biometer

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Eye and Vision 2020年第1期7卷 119-127页

作者： Bao Shu fangjun Bao Giacomo Savini Weicong lu Ruixue Tu Haisi Chen Benhao Song Qinmei Wang Jinhai Huang School of Ophthalmology and Optometry and Eye Hospital Wenzhou Medical University270 West Xueyuan RoadWenzhou 325027ZhejiangChina Key Laboratory of Vision Science Ministry of HealthWenzhouZhejiangPeople’s Republic of China G.B.Bietti Foundation IRCCS RomeItaly

Background:To evaluate the effect of orthokeratology on precision of measurements in children using a new swept-source optical coherence tomography(SS-OCT)optical biometer(OA-2000),and agreement between its measurements and those provided by the commonly used IOLMaster based on partial coherence interferometry(PCI).Methods:This study recruited fifty-one eyes of 51 normal children(8–16 years).An operator took measurements with the two ***,a second operator took measurements with the SS-OCT *** orthokeratology was performed for one month,the same operators repeated the same *** length(AL),mean keratometry(Km)at 2.5 mm and 3.0 mm diameters(Km2.5 and Km3.0),central corneal thickness(CCT),anterior chamber depth(ACD),lens thickness(LT)and corneal diameter(CD)were ***:With the SS-OCT optical biometer,the test-retest repeatability of AL measurements was*** 95%limits of agreement of difference between the two devices for CD parameter were up to 1.53 *** orthokeratology,the fluctuation ranges of difference for Km3.0 measurement was 1.11 times higher than before orthokeratology,while the absolute values of difference for AL,Km2.5,ACD and CD measurements were ***:Before and after orthokeratology,the SS-OCT biometer showed high repeatability and reproducibility for all *** orthokeratology contact lenses affected the agreement between SS-OCT and PCI biometers for Km3.0 *** CD measurement showed poor agreement between the two devices.

关键词： Swept source optical coherence tomography Orthokeratology Precision Agreement Children

Hidden symmetry operators for asymmetric generalized quantum Rabi models

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Chinese Physics B 2022年第1期31卷 320-323页

作者： Xilin lu Zi-Min Li vladimir V Mangazeev Murray T Batchelor Department of Theoretical Physics Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia Mathematical Sciences Institute Australian National UniversityCanberra ACT 2601Australia Centre for Modern Physics Chongqing UniversityChongqing 40444China

The hidden Z2 symmetry of the asymmetric quantum Rabi model(AQRM)has recently been revealed via a systematic construction of the underlying symmetry *** on the AQRM result,we propose an ansatz for the general form of the symmetry operators for AQRM-related *** this ansatz we obtain the symmetry operator for three models:the anisotropic AQRM,the asymmetric Rabi–Stark model(ARSM),and the anisotropic ARSM.

关键词： light-matter interaction hidden symmetry asymmetric quantum Rabi model asymmetric Rabi-Stark model

基于β1-AR/TGF-β1/Smad2通路探讨稳心颗粒对异丙肾上腺素诱导的大鼠心肌纤维化的影响

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环球中医药 2024年第8期17卷 1507-1514页

作者：于露邓芳隽梁嘉钰樊博雅钱舒乐李晓凤天津中医药大学 300383 天津中医药大学第二附属医院心血管科

目的探讨稳心颗粒通过β1-AR/TGF-β1/Smad2通路对异丙肾上腺素(isoproterenol,ISO)诱导大鼠心肌纤维化的影响。方法雄性SD大鼠60只,随机分为对照组、ISO组与稳心颗粒低、中、高剂量组以及胺碘酮组,每组10只,连续给药14天。第15天起,IS... 详细信息

目的探讨稳心颗粒通过β1-AR/TGF-β1/Smad2通路对异丙肾上腺素(isoproterenol,ISO)诱导大鼠心肌纤维化的影响。方法雄性SD大鼠60只,随机分为对照组、ISO组与稳心颗粒低、中、高剂量组以及胺碘酮组,每组10只,连续给药14天。第15天起,ISO组、各药物组大鼠以ISO 5 mg/(kg•d)皮下多点注射构建大鼠心肌纤维化模型。检测大鼠心脏质量指数的变化;采用苏木素—伊红(hematoxylin-eosin,HE)染色观察心肌形态学变化,Masson染色观察心肌胶原分布和含量变化;检测心肌组织羟脯氨酸(hydroxyproline,HYP)和谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-PX)的含量;蛋白免疫印迹法(Western blot,WB)检测大鼠心肌组织交感神经系统-β1肾上腺素能受体(β1 adrenoceptor,β1-AR)、转化生长因子β1(transforming growth factor-β,TGF-β1)、p-Smad2蛋白表达变化。结果ISO组大鼠心脏质量指数明显升,细胞结构紊乱,胶原沉积和心肌纤维化明显,心肌HYP含量显著增多,GSH含量减少,β1-AR、TGF-β1与p-Smad2表达水平显著升高(P0.05)。结论稳心颗粒能够改善ISO引起的心肌纤维化,减轻心肌细胞损伤与胶原纤维堆积,其机制可能与β1-AR/TGF-β1/Smad2通路有关。

关键词：稳心颗粒异丙肾上腺素心肌纤维化交感神经系统-β1肾上腺素能受体转化生长因子β1 Smad2

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Elucidating elusive quaternary selenide EuCeCuSe3:Synthesis,crystal structure,properties and theoretical studies

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Journal of Rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim V.Grigoriev Anna V.Ruseikina Maxim S.Molokeev vladimir A.Chernyshev Aleksandr S.Aleksandrovsky Alexander S.Krylov Svetlana N.Krylova Nikolai P.Shestakov Dmitriy A.Velikanov Alexander A.Garmonov Alexey V.Matigorov Evgeny A.Ostapchuk Thomas Schleid Damir A.Safin Laboratory of Theory and Optimization of Chemical and Technological Processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of Physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation Department of Physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural Sciences and Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation Department of Photonics and Laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of Physics and Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistry University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany Scientific and Educational and Innovation Center for Chemical and Pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation University of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenide EuCeCuSe3,the fabrication of which has been a challenge until this *** structure of the reported selenide was elucidated from the powder X-ray diffraction data,which revealed the formation of EuCeCuSe3with excellent yield(96.7%)accompanied with a minor fraction of CeSe2(3.3%),and was best solved in orthorhombic space group Pnma with the BaLaCuS3structural ***,the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EuRECuSe3(RE=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,lu,Y),of which the cerium-based derivative exclusively belongs to the BaLaCuS3structural *** distortion of the CuSe4polyhedron was compared for the whole series of EuRECuSe3compounds using theτ4-descriptor for four coordinated ions,which revealed the highest degree of distortion for the Ce3+-containing selenide,followed by the La3+-based ***,the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3and *** initio calculations of the crystal structure,a phonon spectrum and elastic constants for the crystal of EuCeCuSe3were also *** types and wavenumbers of fundame ntal modes were determined and the involvement of ions participating in the phonon modes was *** experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated *** experimental direct band gap of EuCeCuSe3was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f(valence band)and 5d(conduction band)levels of the Eu2+*** dependence of the Young’s modulus on the direction demonstrates the anisotropy of the elastic properties,while the Vickers hardness for EuCeCuSe3was calculated to be 5.2 ***,the title compound is paramagnetic above 4 K.

关键词： Quaternary selenide Synthesis Crystal structure Ab initio calculations Magnetic measurements Spectroscopy

Plasma transport simulation under different conditions and optimization analysis of dual-stage grid ion thruster

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Chinese Journal of Aeronautics 2023年第7期36卷 388-399页

作者： Yajie HAN Guangqing XIA Bin SUN Chang lu Junjun ZHANG vladimir A.SAETCHNIKOV State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China Physics and Aerospace Technology Department Belarusian State UniversityMinsk 220030Belarus

In order to study the extraction and acceleration mechanism of the dual-stage grid,a three-dimensional model based on the Particle-In-Cell/Monte Carlo Collision(PIC/MCC)method is ***-stage grid ion thruster is a new type of electrostatic ion thruster,which can break through the limitations of traditional gridded ion thrusters,and greatly improve the specific *** high performance also makes the grid sensitive to operating *** this paper,the influence of grid parameters on xenon ion thruster’s performance in a wide range is systematically simulated,and the optimal operating condition is *** the over-focusing of the plume,and the transparency of the screen grid are improved,and the grid corrosion is reduced through simulation *** specific impulse under the given working conditions is 9877.24 s and the thrust is 7.28 *** on the simulation optimization,the limitation of the dual-stage grid is *** grid performs well under high voltage conditions(>3000 V)but not well under low voltage conditions(<2000 V).Finally,since argon is cheaper and more advantageous in future engineering applications,the plasma distribution and grid extraction ability under xenon and argon are analyzed and compared to study the flexibility of the dual-stage grid ion *** simulation results show that a set of optimal parameters is only applicable to the corresponding propellant,which needs to be optimized for different propellant types.

关键词： 3D modeling Dual-stage grid Ion thruster PIC/MCC method Plasma simulation

Investigation into the operation of an autothermal two-section subbituminous coal fluidized bed gasifier

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International Journal of Coal Science & Technology 2023年第3期10卷 190-203页

作者： Nikolay Abaimov Alexander Ryzhkov Alexey Dubinin lu Ding vladimir Tuponogov Sergey Alekseenko Ural Federal University EkaterinburgRussia 6200022 Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China Institute of Thermophysics Siberian BranchRussian Academy of SciencesNovosibirskRussia 630090

Using a newly developed experimental setup,the features and advantages of an autothermal single-casing atmospheric sub-bituminous coal fluidized bed air-blown gasifier,combining a combustion and gasification section,and mixing the dispersed phase(inert material,char)and heat exchange between them through an annular transfer device,have been *** increase the efficiency of the gasifier,an experimental-computational method was developed find the conditions for optimal operation,combining changing the annular flow's geometry and regulating the primary air for gasification.A simple and reliable multizone thermodynamic calculation model makes it possible to predict the composition of char and syngas in the gasification section with acceptable *** method confirmed that a two-section fluidized bed gasifier can provide efficient gasification of solid fuels and is suitable for use in small-scale cogeneration *** with a heating value of 3.6-4.5 MJ/m^(3)and CGE of 38.2%-42.3%was obtained in the experimental setup without optimizing the primary air flow *** optimization,the indicators increased to the heating value of syngas of 5.20-5.34 MJ/m^(3)and CGE of 42.5%-50.0%.With heat regeneration of 0.8,CGE increases to 70%.

关键词： Coal Syngas Gasification Bubbling fluidized bed Thermodynamics Modeling