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Topology Optimization Method of Structures with Surface Corrosion Considered

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Acta Mechanica Solida Sinica 2023年第2期36卷 241-253页

作者： ran li Shutian liu State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China

Engineering equipment served in harsh environments for a long time will inevitably corrode,resulting in a loss of mechanical performance and a reduction in a lifetime,and even threatening production *** conventional post-treatment anti-corrosion technologies can slow down the corrosion rate,it is important to consider the corrosion effect on the structural performance in *** paper proposes a topology optimization method with prior consideration of structural corrosion resistance during the design phase,so the structures designed by the approach can have excellent corrosion resistance,considerably reducing the cost of post-treatment anti-corrosion ***,an erosion-based method is utilized to identify the structural surface *** the procedure,the initial structure is eroded to generate a reduced-scale eroded structure,and then,the eroded regions are specified as the surface ***,dual-material interpolation is used to create the corrosion model by modifying the material properties of elements on the structural surface layer,which is set to 0 to simulate uniform ***,the topology optimization method with structural surface corrosion considered is enforced through a two-step filtering/projection *** the entire lifetime corrosion analysis,various numerical examples indicate that the structural performance of the proposed method is superior to that of the standard method(SIMP interpolation)without considering the influence of corrosion,demonstrating the effectiveness of the proposed method.

关键词： Topology optimization Corrosion resistance Surface layer identification Surface corrosion

Hawking radiation and page curves of the black holes in thermal environment

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Communications in Theoretical Physics 2021年第7期73卷 106-114页

作者： ran li Jin Wang School of Physics Henan Normal UniversityXinxiang 453007China Department of Chemistry SUNYStony BrookNY 11794United States of America Department of Chemistry and of Physics and Astronomy State University of New York at Stony BrookStony BrookNY 11794-3400United States of America

As realistic objects in the Universe,the black holes are surrounded by complex *** taking the effect of thermal environment into account,we investigate the evaporation process and the time evolutions(page curves)of the entanglement entropies of Hawking radiation of various types of black *** is found that the black holes with the thermal environments evaporate slower than those without the environments due to the environmental contribution of the energy flux in addition to Hawking *** Schwarzschild black hole and Reissner-Nordstr?m black hole in flat spaces,when the initial temperature of the black hole is higher than the environment temperature,the black holes evaporate completely and the Hawking radiation is eventually *** Schwarzschild-Ad S black hole,it will evaporate completely and the Hawking radiation is purified when the environment temperature is lower than the critical ***,it will reach an equilibrium state with the environment and the radiation is maximally entangled with the black *** results indicate that the final state of the black hole is determined by the environmental temperature and the temporal evolution and the speed of the information purification process characterized by the page curve of the Hawking radiation is also influenced by the thermal environment significantly.

关键词： Hawking radiation page curve black hole thermal environment entanglement entropy

End wall effect on particle motion in a chute flow

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Particuology 2021年第1期19卷 102-108页

作者： ran Wang ran li Shuaishuai Wang Quan Chen Hui Yang School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghai 200093China

The influence of the end wall of a chute on the rotation of internal characteristic particles is mainly on the z-axis.A measurement device based on inertial measurement technology does not require the assistance of external information;hence,it is especially suitable for measuring the angular and translational velocities of internal characteristic *** study the influence of the end wall of the chute on the motions of the internal characteristic particles,the z-axis rotational and translational velocities of the internal characteristic particles in the chute were measured,and it was found that the rotational velocity about the z-axis differs according to the initial *** z-axis angular velocity of a characteristic particle at the centre fluctuates near 0,and the average value approaches *** z-axis angular velocity of a characteristic particle at the left end wall is typically *** phenomenon is due to the influence of the end wall on the rotational motions of particles with initial positions that are near the end *** addition,the average translational velocity of the characteristic particles is also affected by the end *** distributions of the average z-axis angular velocity and the average translational velocity are quantitatively analysed,and the correlation between the tilt angle of the chute and the end wall effect is studied.

关键词： Chute Particle rotation End wall

FGF13 suppresses acute myeloid leukemia by regulating bone marrow niches

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Frontiers of Medicine 2022年第6期16卷 896-908页

作者： ran li Kai Xue Junmin li Shanghai Institute of Hematology State Key Laboratory of Medical GenomicsNational Research Center for Translational Medicine at ShanghaiRuijin HospitalShanghai Jiao Tong University School of MedicineShanghai200025China

Fibroblast growth factor 13(FGF13)is aberrantly expressed in multiple cancer types,suggesting its essential role in ***,we aimed to explore its definite role in the development of acute myeloid leukemia(AML)and emphasize its associations with bone marrow *** showed that FGF13 was lowly expressed in patients with AML and that its elevated expression was related to prolonged overall survival(OS).Univariate and multivariate Cox regression analyses identified FGF13 as an independent prognostic factor.A prognostic nomogram integrating FGF13 and clinicopathologic variables was constructed to predict 1-,3-,and 5-year *** mutation and functional analyses indicated that FGF13 was not associated with AML driver mutations but was related to bone marrow *** for immunity,FGF13 was remarkably associated with T cell count,immune checkpoint genes,and *** addition,FGF13 overexpression substantially inhibited the growth and significantly induced the early apoptosis of AML *** xenograft study indicated that FGF13 overexpression prolonged the survival of recipient ***,FGF13 could serve as an independent prognostic factor for AML,and it was closely related to the bone marrow microenvironment.

关键词： acute myeloid leukemia FGF13 prognosis immune-related genes bone marrow niches

Role of lymphotoxin alpha as a new molecular biomarker in revolutionizing tear diagnostic testing for dry eye disease

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International Journal of Ophthalmology(English edition) 2023年第11期16卷 1883-1889页

作者： Chao-ran li Tianjin Medical University Eye Hospital Tianjin 310011China

Dry eye disease(DED),primarily classified as multifactorial ocular surface disorder,afflicts tens of millions of individuals worldwide,adversely impacting their quality of *** research has been conducted on tear film analysis over the past decades,offering a range of tests to evaluate its volume,health,and ***,early diagnosis and effective treatment for DED continue to pose significant challenges in clinical ***,by recognizing key phenomena in DED such as ocular surface inflammation,hyperosmolarity,and tear film instability,this article provides a comprehensive overview of both traditional and recently developed methods for diagnosing and monitoring *** information serves as a valuable resource not only for clinical diagnosis but also for further research into DED.

关键词： dry eye disease tear film biomarker matrix metalloproteinase 9 lymphotoxin alpha

Extended optimal guidance law with impact angle and acceleration constriants

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Journal of Systems Engineering and Electronics 2014年第5期25卷 868-876页

作者： ran li Qunli Xia Qiuqiu Wen Department of Aerospace Beijing Institute of Technology China North Industries Group Corporation

The extended optima straints of miss distance and Schwartz inequality. To reduce guidance law with terminal conmpact angle is derived by the terminal acceleration and eliminate gravity disturbance absolutely, the object function, which designs the weight of control command to be the power function of time-to-go＇s reciprocal, is given. And the gravity is considered when building the state equation. Based on the parsing express of the guidance command change with varying time and adjoint system analysis method, the command characteristics and the non-dimensional miss distance of the guidance law are analyzed, a design principle of guidance order coefficients is discussed. Finally, based on the requirement of engineering, the method to calculate the guidance condition and maximal required acceleration of the guidance law is given. The simulation demonstrates that not only the guidance law can satisfy the terminal position and impact angle constraints, but also the terminal acceleration can be converged toward zero, which will support a good situation for the terminal angle of attacking control.

关键词： impact angle constraint optimal guidance law accel- eration command guidance order.

Artificial intelligence in individualized retinal disease management

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International Journal of Ophthalmology(English edition) 2024年第8期17卷 1519-1530页

作者： Zi-ran Zhang Jia-Jun li Ke-ran li The Affiliated Eye Hospital of Nanjing Medical University Nanjing 210029Jiangsu ProvinceChina Nanjing Medical University Nanjing 210029Jiangsu ProvinceChina

Owing to the rapid development of modern computer technologies,artificial intelligence(AI)has emerged as an essential instrument for intelligent analysis across a range of *** has been proven to be highly effective in ophthalmology,where it is frequently used for identifying,diagnosing,and typing retinal *** increasing number of researchers have begun to comprehensively map patients’retinal diseases using AI,which has made individualized clinical prediction and treatment *** include prognostic improvement,risk prediction,progression assessment,and interventional therapies for retinal *** have used a range of input data methods to increase the accuracy and dependability of the results,including the use of tabular,textual,or image-based input *** also combined the analyses of multiple types of input *** give ophthalmologists access to precise,individualized,and high-quality treatment strategies that will further optimize treatment outcomes,this review summarizes the latest findings in AI research related to the prediction and guidance of clinical diagnosis and treatment of retinal diseases.

关键词： artificial intelligence artificial intelligence in ophthalmology retinal disease

Radial Operators on the Weighted Bergman Spaces over the Polydisk

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Acta Mathematica Sinica,English Series 2019年第2期35卷 227-238页

作者： ran li Yu Feng LU School of Mathematical Sciences Dalian University of Technology

In this paper, we study radial operators in Toeplitz algebra on the weighted Bergman spaces over the polydisk by the(m, λ)-Berezin transform and find that a radial operator can be approximated in norm by Toeplitz operators without any conditions. We prove that the compactness of a radial operator is equivalent to the property of vanishing of its(0, λ)-Berezin transform on the boundary. In addition, we show that an operator S is radial if and only if its(m, λ)-Berezin transform is a separately radial function.

关键词： Radial operators (m,λ)-Berezin transform weighted Bergman spaces Toeplitz operators

Wind Environment Analysis of Ground-based Optical Observatory

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Research in Astronomy and Astrophysics 2022年第4期22卷 11-20页

作者： Tao-ran li Xiao-Jun Jiang Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The telescopes and the infrastructures may alter the local wind environment around the observatory and further affect the observing *** the completion of site testing,it is necessary to analyze the wind environment of the entire site and plan the telescope layout to make use of the excellent conditions scientifically and *** a typical observatory as an example,the effect of topographical features on the wind environment and the mutual interference between telescope enclosures are analyzed by using the Computational Fluid Dynamics(CFD)*** CFD simulations are compared with the seeing data from the Differential Image Motion Monitor,and the results are in good agreement,which verifies the effectiveness of the CFD *** results of wind environment analysis can provide reasonable suggestions for site layout and construction,reducing the interference effects and improving the observing environment.

关键词： methods:numerical telescopes atmospheric effects turbulence