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Aerodynamic Optimization and Flow Mechanism for a Compressor Cascade at Low Reynolds Number

Journal of Thermal Science 2025年第1期 92-109页

作者： LI lin zhang Jianshe CHEN Caiyan TAN Wei zhang Yanfeng Key Laboratory of Light-Duty Gas-Turbine Institute of Engineering ThermophysicsChinese Academy of Sciences University of Chinese Academy of Sciences National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine

Low-Reynolds-number effect is an important factor affecting the performance of compressors and other main components of high-altitude long-endurance unmanned aerial *** improve the flow condition and reduce flow loss under the condition of high altitude and low Reynolds number(Re),this paper proposes an optimization process based on a surrogate model,which combines the class-shape transformation method(CST),the Latin hypercube sampling(LHS) method,the light gradient-boosting machine algorithm(LightGBM),and a genetic algorithm(GA) to optimize a high-subsonic compressor *** surrogate model is verified to be accurate and can be used in the optimization *** accuracy of the GA is higher than the other algorithms under common test *** optimization results are verified by numerical simulation,and the flow differences before and after optimization are compared,especially the flow within the boundary *** changing the blade shape,the optimization process adjusts the loading distribution to delay the transition of the optimized blade on the suction surface,which changes the turbulent reattachment in the laminar separation bubble(LSB) into laminar ***,the mixing loss induced by the turbulent reattachment of the LSB and the wake loss of turbulent separation at the trailing edge are significantly reduced,and the performance of the compressor profile is finally *** addition,turbulent separation of the optimized profile is delayed reducing the range of the wake region on the suction *** this optimization process,the reduction of total pressure loss coefficient at Re of 2.5×10～5,3.5×10～5,and 4.5×10～5 are 16.32%,20.76%,and 22.16%,respectively.

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Recent progress on eco-friendly quantum dots for bioimaging and diagnostics

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Nano Research 2024年第12期17卷 10309-10331页

作者： Yanbing Lv Lifang zhang Ruili Wu lin song Li Key Lab for Special Functional Materials of the Ministry of Education and School of Nanoscience and Materials EngineeringHenan UniversityKaifeng 475004China

Semiconductor quantum dots(QDs),as promising fluorescent materials,have been widely applied in biomedical application due to their unique optical ***,the most intensively studied are Cd-containing QDs(Cd-based QDs),whose potential toxicity prevents their further *** recent years,the eco-friendly QDs with low toxicity and environmental friendliness have begun to be developed,showing great potential in biomedical *** high-quality synthesis of eco-friendly QDs and the appropriate surface modification are key to realize their *** review summarizes the progress of eco-friendly QDs for biomedical applications,including their designed preparation,optical properties,surface modification,toxicity,and their applications in bioimaging and ***,the challenges of eco-friendly QDs for future bioimaging and diagnostics application were *** believe this review will provide important guidance for promoting the development of eco-friendly QDs in bioimaging and diagnostics.

关键词： eco-friendly quantum dots(QDs) environmental friendliness surface modification bioimaging diagnostics

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Analysis of the anti-T2DM components in dichloromethane fraction of Schisandra sphenanthera and its mechanism

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Traditional Medicine Research 2025年第1期10卷 27-43页

作者： Shi-Bo Feng Hai-Hui Jiang Hui-Li Kang Yi Jiang Hua-Wei zhang Xiao-Mei song Yu-Ze Li Wen-Li Huang Dong-Dong zhang Chong Deng School of Pharmacy Shaanxi University of Chinese MedicineXianyang 712046China School of Pharmacy and Shaanxi Qinling Application Development and Engineering Center of Chinese Herbal Medicine Shaanxi University of Chinese MedicineXianyang 712046China Key Laboratory for Research and Development of“Qin Medicine”of Shaanxi Administration of Traditional Chinese Medicine Xianyang 712046China Shaanxi Key Laboratory of Research and Application of“Taibai Qi Yao” Xianyang 712046China

Background:The type 2 diabetes mellitus(T2DM)pharmacodynamic study of various parts of Schisandra sphenanthera was conducted in the previous stage,and it was found that dichloromethane extracted part(SDP)had a significant hypoglycemic ***,the components of SDP were analyzed,and the specific mechanism of its anti-T2DM was ***:We used a high-fat,high-sugar diet in combination with streptozotocin to induce a T2DM rat model,and the model rats were divided into two groups according to body weight and blood ***,oral glucose tolerance test,fasting blood glucose,low density lipoprotein cholesterol,superoxide dismutase,insulin,glycated hemoglobin,total cholesterol,nonesterified free fatty acids,alanine aminotransferase,high-density lipoprotein cholesterol,aspartate aminotransferase,malondialdehyde,and glutathione peroxidase were measured,organ indices were calculated,and pathological sections of pancreas and liver were *** 16S rRNA V3–V4 region of intestinal flora was sequenced to explore the effect of SDP on biochemical indicators and intestinal *** on the above indicators,the anti-T2DM mechanism of SDP in Schisandra sphenanthera was ***:After six weeks of administration,the biochemical indices of diabetic rats were diminished compared to the control *** SDP could significantly increase the gut microbialα-diversity index,resulting in significant changes in the flora of T2DM rats,with increased richness and diversity,reduced harmful flora,and significantly back-regulated the levels of acetic acid,propionic acid,and butyric ***:SDP can improve the symptoms associated with elevated blood glucose,dyslipidemia,elevated fasting insulin levels,and damaged glucose tolerance in *** against T2DM may be through the control of intestinal flora to normalize and exert anti-diabetic effect;its main active components may be lignans and terpenoids.

关键词： Schisandra sphenanthera T2DM intestinal flora HPLC

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Evaluation and improvement of pearlite microstructure and mechanical properties in 45Cr4NiMoV and 50Cr5NiMoV steels

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Journal of Iron and Steel Research International 2022年第12期29卷 1995-2005页

作者： Kai-quan Liu Xue-jiao zhang Xiao-yang song lin Zhao lin Zhu State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina Tianjin Heavy Industries Research&Development Co. Ltd.CFHITianjin 300457China China First Heavy Industry Qiqihar 161042HeilongjiangChina Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China

The microstructure and mechanical properties of pearlite in 45Cr4NiMoV and 50Cr5NiMoV steels were studied and *** microstructural characteristics of pearlite of two steels were carefully examined by optical microscopy,scanning electron microscopy and transmission electron microscopy(TEM),and the type,size and relative amount of extracted carbide particles were analyzed by X-ray diffraction and TEM coupled with selected area electron *** hardness,tensile property,impact and fracture toughness of pearlite of two steels were also ***,the carbide dissolution kinetics of 45Cr4NiMoV and 50Cr5NiMoV steels were *** results indicated that the carbides in 50Cr5NiMoV steel exhibited higher dissolution temperature than those in 45Cr4NiMoV steel,which induced different morphologies of pearlite after eutectoid *** to the pearlite with lamellar M_(23)C_(6)carbides in 45Cr4NiMoV steel,the pearlite with the mixture of spheroidized M_(7)C_(3)and lamellar M_(23)C_(6)carbides in 50Cr5NiMoV steel possessed higher impact and plane-strain fracture toughness but lower hardness and strength,because different pearlite morphologies led to different mechanical *** order to further improve the comprehensive properties of the steels,the fraction of M_(7)C_(3)for the material with acceptable properties was examined and dissolution kinetic of M_(7)C_(3)was ***,the austenitizing temperature and holding time could be appropriately selected to keep enough undissolved M_(7)C_(3)in the steels.

关键词： Microstructure Carbide Back-up roll Mechanical property Toughness Spheroidization

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Dynamical Algebras in the 1+1 Dirac Oscillator and the Jaynes–Cummings Model

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Chinese Physics Letters 2020年第5期37卷 1-4页

作者： Wen-Ya song Fu-lin zhang Department of Physics School of ScienceTianjin UniversityTianjin 300072

We study the algebraic structure of the one-dimensional Dirac oscillator by extending the concept of spin symmetry to a noncommutative *** SO(4)algebra is found connecting the eigenstates of the Dirac oscillator,in wh... 详细信息

关键词： Dirac oscillator Cummings

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柴油机微粒中直接致突变物对细胞DNA的损伤

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卫生毒理学杂志 2001年第4期15卷 222-224页

作者：陈薛宋崇林张延峰王春花刘克明天津大学内燃机燃烧学国家重点实验室天津300072 天津市卫生防病中心

目的　了解柴油机排气微粒有机可溶成分中的直接致突变物对细胞DNA的损伤作用。方法　利用稀释通道法采集柴油机排气微粒、索氏萃取器提取有机可溶成分。采用单细胞凝胶电泳池 (彗星试验 )检测有机可溶成分中的直接致突变物对细胞DNA的... 详细信息

目的　了解柴油机排气微粒有机可溶成分中的直接致突变物对细胞DNA的损伤作用。方法　利用稀释通道法采集柴油机排气微粒、索氏萃取器提取有机可溶成分。采用单细胞凝胶电泳池 (彗星试验 )检测有机可溶成分中的直接致突变物对细胞DNA的损伤作用。结果　在一定浓度范围内 ,其彗星率和彗星尾长均随受试物的浓度增加而增加 ,且有显著的剂量反应关系。当SOF样品的浓度达到 1mg ml时 ,细胞的彗星率为 96 % ,拖尾长为(10 9 5± 10 2 ) μmol。结论　柴油机排气微粒有机可溶成分中的直接致突变物对细胞DNA具有明显的损伤作用。

关键词：彗星试验柴油机微粒有机可溶成分直接致突变物 DNA损伤

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Mitochondria hyperactivity contributes to social behavioral impairments

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Signal Transduction and Targeted Therapy 2020年第1期5卷 1350-1351页

作者： Yun zhang lin Peng Weihong song Townsend Family Laboratories Department of PsychiatryThe University of British Columbia2255 Wesbrook MallVancouverBC V6T 1Z3Canada Advanced Innovation Center for Human Brain Protection National Clinical Research Center for Geriatric DisordersXuanwu HospitalCapital Medical UniversityBeijing 100053China Shandong Collaborative Innovation Center for Diagnosis Treatment and Behavioral Interventions of Mental DisordersInstitute of Mental HealthJining Medical UniversityJining 272000 ShandongChina

MITOCHONDRIA AND SOCIAL DISORDERS In a recent article in cell,Kanellopoulos et *** that Aralar,as mitochondrial GABA transporter,mediates the effect of mitochondrial hyperactivity on causing social behavior deficits.

关键词： al impairment effect

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Photostriction effect and electric properties of La-doped PMN-PT transparent ferroelectric ceramics

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International Journal of Smart and Nano Materials 2024年第2期15卷 296-311页

作者： Zhiqiang song Zhuo zhang Yirong Yu Dabin lin Department of Automation and Robotics Engineering School of AutomationWuxi UniversityWuxiChina School of Optoelectronic Engineering Xian Technological UniversityXi'anChina

Ferroelectric ceramics display a remarkable photostriction effect,which could facilitate the prevention of electromagnetic interference and promote the integration and miniaturization of actuator systems,indicating potential applications in glim-mer *** this work,highly transparent La-doped 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3(0.9PMN-0.1PT)ceramicswere synthesized using a solid-state reaction method in an oxyge-nated *** and SEM were used to analyze the phase structure of the dense samples,which displayed a pure perovskite structure,with no trace of a pyrochlore *** La doping,the phase transitiontemperature shows a decreasing trend,and its dielectric constant could reach up to 20,*** P-E loop of the samples was gradually refined into a straight line with an increase in the doping *** La doping,the transparency of the 0.9PMN-0.1PT cera-mics was significantly enhanced and reached up to 61%at the near-infrared ***,the photogenerated voltage and deformation of the La-doped 0.9PMN-0.1PT ceramics were investigated under ultraviolet light of various *** 20 s of irradiation at an intensity of 800 mW/cm²,the max-imum voltage and deformation,with values of 40 V and 250 nm,respectively,were both found in the 1%La-doped 0.9PMN-0.1PT ceramics.

关键词： Photostriction ferroelectric Raman piezoelectric

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Recent progress and future prospect of digital soil mapping： A review

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Journal of Integrative Agriculture 2017年第12期16卷 2871-2885页

作者： zhang Gan-lin LIU Feng song Xiao-dong State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 P.R China University of Chinese Academy of Sciences Beijing 100049 P.R. China

To deal with the global and regional issues including food security, climate change, land degradation, biodiversity loss, water resource management, and ecosystem health, detailed accurate spatial soil information is urgently needed. This drives the worldwide development of digital soil mapping. In recent years, significant progresses have been made in different aspects of digital soil mapping. The main purpose of this paper is to provide a review for the major progresses of digital soil mapping in the last decade. First, we briefly described the rise of digital soil mapping and outlined important milestones and their influence, and main paradigms in digital soil mapping. Then, we reviewed the progresses in legacy soil data, environmental covariates, soil sampling, predictive models and the applications of digital soil mapping products. Finally, we summarized the main trends and future prospect as revealed by studies up to now. We concluded that although the digital soil mapping is now moving towards mature to meet various demands of soil information, challenges including new theories, methodologies and applications of digital soil mapping, especially for highly heterogeneous and human-affected environments, still exist and need to be addressed in the future.

关键词： digital soil mapping soil-landscape model predictive models soil functions spatial variation

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Global Existence and Asymptotic Behavior of Solutions to a Free Boundary Problem for the 1D Viscous Radiative and Reactive Gas

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Acta Mathematica Sinica,English Series 2018年第5期34卷 827-842页

作者： Chang Ming song Hong LI Jian lin zhang Department of Applied Mathematics College of Science Zhongyuan University of Technology Zhengzhou 450007 P. R. China Department of Applied Physics College of Science Zhongyuan University of Technology Zhengzhou 450007 P. R. China

In this paper, we study a free boundary problem for the 1D viscous radiative and reactive gas. We prove that for any large initial data, the problem admits a unique global generalized solution. Meanwhile, we obtain th... 详细信息

关键词： Radiative and reactive gases global solution free boundary problem asymptotic behavior

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