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Meteoroid and Space Debris Risk Assessment for Satellites Orbiting the Earth/Moon

空间科学学报 2023年第4期43卷 724-735页

作者： feng shuai WANG Ronglan National Space Science Center Chinese Academy of SciencesBeijing 100190 University of Chinese Academy of Sciences Beijing 100049 State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190 Key Laboratory of Science and Technology on Environmental Space Situation Awareness Chinese Academy of SciencesBeijing 100190

Interplanetary meteoroids and space debris can impact satellites orbiting the Earth or spacecraft traveling to the Moon.Targeting China Space Station(CSS),7 satellites selected from the constellation of Beidou Navigation Satellite System Phase III(BDS-3),and 3 spacecraft orbiting the Moon,we have adopted in the paper the Meteoroid Engineering Model 3,Divine-Staubach meteoroid environment model,and Jenniskens-McBride meteoroid steam model to analyze the meteoroid environment with the mass range of 10–6~10 g.Orbital Debris Engineering Model 3.1 space debris model is used to analyze the orbital debris environment faced by these satellites.The flux of space debris with a size larger than 100μm is compared with that of the meteoroids.The results show that the space debris flux encountered by China Space Station is much higher than that of the meteoroids with sizes in the above range.And quite the opposite,the meteoroids flux impacting the 7 satellites from the BDS-3 is higher.Upon adopting the double-layer Whipple protection measure,the catastrophic collision flux of these satellites encountering meteoroids is about 10–6 times of that without protection,or even less,implying that the Whipple protection effectively guarantees the safety of the satellites in orbit.Besides,it is also found that the flux of the high-density meteoroid population encountered by each satellite is greater than that of the low-density population,whereas the impact velocity is lower for each satellite.These results can aid the orbit selection and the protection design for satellites and spacecraft.

关键词： Meteoroid environment model Space debris model Ballistic limit equation Impact risk assessment

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Oxygen vacancy boosting Fenton reaction in bone scaffold towards fighting bacterial infection

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International Journal of Extreme Manufacturing 2024年第1期6卷 296-311页

作者： Cijun shuai Xiaoxin Shi feng Yang Haifeng Tian Pei feng State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083People’s Republic of China Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013People’s Republic of China College of Mechanical Engineering Xinjiang UniversityUrumqi 830017People’s Republic of China

Bacterial infection is a major issue after artificial bone transplantation due to the absence of antibacterial function of bone scaffold,which seriously causes the transplant failure and even amputation in severe cases.In this study,oxygen vacancy(OV)defects Fe-doped Ti O2(OV-FeTiO2)nanoparticles were synthesized by nano TiO2and Fe3O4via high-energy ball milling,which was then incorporated into polycaprolactone/polyglycolic acid(PCLGA)biodegradable polymer matrix to construct composite bone scaffold with good antibacterial activities by selective laser sintering.The results indicated that OV defects were introduced into the core/shell-structured OV-FeTiO2nanoparticles through multiple welding and breaking during the high-energy ball milling,which facilitated the adsorption of hydrogen peroxide(H2O2)in the bacterial infection microenvironment at the bone transplant site.The accumulated H2O2could amplify the Fenton reaction efficiency to induce more hydroxyl radicals(·OH),thereby resulting in more bacterial deaths through·OH-mediated oxidative damage.This antibacterial strategy had more effective broad-spectrum antibacterial properties against Gram-negative Escherichia coli(E.coli)and Gram-positive Staphylococcus aureus(S.aureus).In addition,the PCLGA/OV-FeTiO2scaffold possessed mechanical properties that match those of human cancellous bone and good biocompatibility including cell attachment,proliferation and osteogenic differentiation.

关键词： bacterial infection bone scaffold selective laser sintering Fenton reaction antibacterial properties

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The key challenges and future opportunities of electrochemical capacitors

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Journal of Energy Chemistry 2023年第1期76卷 459-461,I0012页

作者： Fangyan Liu Xinliang feng Zhong-shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Center for Advancing Electronics Dresden(Cfaed)and Faculty of Chemistry and Food Chemistry Technische Universitat Dresden01062 DresdenGermany Department of Synthetic Materials and Functional Devices Max Planck Institute of Microstructure PhysicsD-06120 Halle(Saale)Germany

Electrochemical capacitors(ECs)with unique merits of fast charge/discharge rate and long cyclability are one of the representative electrochemical energy storage systems,possessing wide applications in power electroni... 详细信息

关键词： Electrochemical capacitors Electrical double layer capacitors Pseudocapacitors Li-ion capacitors Microscale electrochemical capacitors

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Ag-doped CNT/HAP nanohybrids in a PLLA bone scaffold show significant antibacterial activity

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Bio-Design and Manufacturing 2024年第2期7卷 105-120页

作者： Cijun shuai Xiaoxin Shi Kai Wang Yulong Gu feng Yang Pei feng State Key Laboratory of Precision Manufacturing for Extreme Service Performance College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China Institute of Additive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China College of Mechanical Engineering Xinjiang UniversityUrumqi 830017China

Bacterial infection is a major problem following bone implant surgery.Moreover,poly-l-lactic acid/carbon nanotube/hydroxyapatite(PLLA/CNT/HAP)bone scaffolds possess enhanced mechanical properties and show good bioactiv-ityregardingbonedefectregeneration.Inthisstudy,wesynthesizedsilver(Ag)-dopedCNT/HAP(CNT/Ag-HAP)nanohybrids via the partial replacing of calcium ions(Ca2+)in the HAP lattice with silver ions(Ag+)using an ion doping technique under hydrothermal conditions.Speciﬁcally,the doping process was induced using the special lattice structure of HAP and the abundant surface oxygenic functional groups of CNT,and involved the partial replacement of Ca2+in the HAP lattice by doped Ag+as well as the in situ synthesis of Ag-HAP nanoparticles on CNT in a hydrothermal environment.The result-ing CNT/Ag-HAP nanohybrids were then introduced into a PLLA matrix via laser-based powder bed fusion(PBF-LB)to fabricate PLLA/CNT/Ag-HAP scaffolds that showed sustained antibacterial activity.We then found that Ag+,which pos-sesses broad-spectrum antibacterial activity,endowed PLLA/CNT/Ag-HAP scaffolds with this activity,with an antibacterial effectiveness of 92.65%.This antibacterial effect is due to the powerful effect of Ag+against bacterial structure and genetic material,as well as the physical destruction of bacterial structures due to the sharp edge structure of CNT.In addition,the scaffold possessed enhanced mechanical properties,showing tensile and compressive strengths of 8.49 MPa and 19.72 MPa,respectively.Finally,the scaffold also exhibited good bioactivity and cytocompatibility,including the ability to form apatite layers and to promote the adhesion and proliferation of human osteoblast-like cells(MG63 cells).

关键词： Ag-doped Carbon nanotube/hydroxyapatite(CNT/HAP) Antibacterial properties Bone scaffold

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A perspective on graphene for supercapacitors: Current status and future challenges

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Journal of Energy Chemistry 2021年第2期30卷 354-357,I0012页

作者： feng Su Zhong-shuai Wu Dalian National Laboratory for Clean Energy.Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Supercapacitors,also known as ultracapacitors or electrochemical capacitors,possess intriguing merits of high power density(10-100 times higher than that of batteries),long life expectancy(millions of cycles),wide ope... 详细信息

关键词： Graphene Supercapacitors Energy storage Electric double layer capacitors Pseudocapacitors Hybrid supercapacitors

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A Reliability Evaluation Method for Intermittent Jointed Rock Slope Based on Evolutionary Support Vector Machine

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Computer Modeling in Engineering & Sciences 2021年第10期129卷 149-166页

作者： shuai Zheng An-Nan Jiang Kai-Shuai Feng College of Transportation Engineering Dalian Maritime UniversityDalian116026China

The randomness of rock joint development is an important factor in the uncertainty of geotechnical engineering stability.In this study,a method is proposed to evaluate the reliability of intermittent jointed rock slope.The least squares support vector machine(LSSVM)evolved by a bacterial foraging optimization algorithm(BFOA)is used to establish a response surface model to express the mapping relationship between the intermittent joint parameters and the slope safety factor.The training samples are obtained from the numerical calculation based on the joint finite element method during this process.Considering the randomness of the intermittent joint parameters in the actual project,each parameter is evaluated at different locations on the site,and its distribution characteristics are counted.According to these statistical results,a large number of parameter combinations are obtained through Monte Carlo sampling.The trained machine learning mapping model is used to obtain the slope safety factor corresponding to each group,and these results are then used to obtain the slope reliability.When the research results were applied to slope disaster treatment along the Yalu River in China’s Jilin Province,it was found that the joint length and joint inclination angle both play key roles in rock slope stability,which should receive more attention in the slope treatment.In summary,this study establishes a method for evaluating the reliability of intermittent jointed rock slope based on an evolutionary SVM model,and its feasibility is verified by engineering application.

关键词： Slope reliability intermittent joint safety factor intelligent algorithm parameter sensitivity

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Constraining nuclear symmetry energy with the charge radii of mirror-pair nuclei

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Nuclear Science and Techniques 2023年第8期34卷 154-163页

作者： Rong An shuai Sun Li-Gang Cao feng-Shou Zhang Key Laboratory of Beam Technology of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Key Laboratory of Beam Technology of Ministry of Education Institute of Radiation TechnologyBeijing Academy of Science and TechnologyBeijing 100875China CAS Key Laboratory of High Precision Nuclear Spectroscopy Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator of LanzhouLanzhou 730000China

The nuclear charge radius plays a vital role in determining the equation of state of isospin asymmetric nuclear matter.Based on the correlation between the differences in charge radii of mirror-partner nuclei and the slope parameter(L)of symmetry energy at the nuclear saturation density,an analysis of the calibrated slope parameter L was performed in finite nuclei.In this study,relativistic and nonrelativistic energy density functionals were employed to constrain the nuclear symmetry energy through the available databases of the mirror-pair nuclei^(36)Ca–^(36)S,^(38)Ca–^(38)Ar,and ^(54)Ni–^(54)Fe.The deduced nuclear symmetry energy was located in the range 29.89–31.85 MeV,and L of the symmetry energy essentially covered the range 22.50–51.55 MeV at the saturation density.Moreover,the extracted L_(s) at the sensitivity density p_(s)=0.10 fm^(-3) was located in the interval range 30.52–39.76 MeV.

关键词： Symmetry energy Charge radii Mirror nuclei

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Multiregional neural pathway: from movement planning to initiation

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Signal Transduction and Targeted Therapy 2022年第7期7卷 2121-2122页

作者： Xing-feng Mao shuai-shuai Wang feng Han Key Laboratory of Cardiovascular&Cerebrovascular Medicine Drug Target and Drug Discovery CenterSchool of PharmacyNanjing Medical UniversityNanjingChina Gusu School Nanjing Medical UniversitySuzhou Municipal HospitalThe Affiliated Suzhou Hospital of Nanjing Medical UniversitySuzhouChina Institute of Brain Science The Affiliated Brain Hospital of Nanjing Medical UniversityNanjingChina

A recent study by Inagaki et al.provides new evidence that the input from the pedunculopontine nucleus/midbrain reticular nucleus(PPN/MRN)to the thalamus can trigger a rapid switch of ALM activity from a motor planning mode to a motor execution mode.1 Planning and execution are vital components of motor behavior that are produced by distinct patterns of neuronal activity.Neuroscience researchers have devoted substantial effort to exploring how the precise neural pathway mediates cuetriggered population activity pattern switching for the execution of planned movements.The different patterns of neuronal population activity in the motor cortex,thalamus,brainstem,and spinal cord are related to motor planning and execution.2,3 However,to understand how neuronal dynamics in the cortex trigger motor execution,it is essential to explore the mechanism underlying the transition between those different modes in response to contextual Go cues(Fig.1).

关键词： cortex al. execution

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Complete Rupture of the Pregnant Uterus:A 10-year Retrospective Descriptive Study

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Current Medical Science 2022年第1期42卷 177-184页

作者： Qiong ZHOU Xuan ZHOU Ling feng Shao-shuai WANG Department of Obstetrics and Gynecology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Objective:The goal of this work is to analyze the incidence,etiology,clinical characteristics,maternal and neonatal outcomes of complete uterine rupture during pregnancy.Methods:The information of complete uterine rupture between June 2010 and May 2020 was investigated retrospectively at a tertiary center,and included demographic data,delivery characteristics,intraoperative findings,and maternal and neonatal outcomes.The prevalence rate of uterine rupture in the early group(hospitalized from June 2010 to May 2015)and late group(June 2015 to May 2020)was compared and analyzed.

关键词： complete uterine rupture scarred uterine rupture spontaneous uterine rupture pregnancy outcome

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Identification of Early Peach Aphid Infestation Based on Hyperspectral Imaging Technology

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Journal of Beijing Institute of Technology 2023年第3期32卷 374-383页

作者： Yangyang Fan Wenjie feng Zhengjun Qiu shuai Wang Institute of Agricultural Information and Economics Shandong Academy of Agricultural SciencesJinan 250000China College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310000China

Peach aphid is a common pest and hard to detect.This study employs hyperspectral imaging technology to identify early damage in green cabbage caused by peach aphid.Through principal component transformation and multiple linear regression analysis,the correlation relation between spectral characteristics and infestation stage is analyzed.Then,four characteristic wavelength selection methods are compared and optimal characteristic wavelengths subset is determined to be input for modelling.One linear algorithm and two nonlinear modelling algorithms are compared.Finally,support vector machine(SVM)model based on the characteristic wavelengths selected by multi-cluster feature selection(MCFS)acquires the highest identification accuracy,which is 98.97%.These results indicate that hyperspectral imaging technology have the ability to identify early peach aphid infestation stages on green cabbages.

关键词： peach aphid hyperspectral imaging machine learning green cabbage

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