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A Preliminary comparative Study on the centering Algorithms for cassiniISS NAc Images

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Research in Astronomy and Astrophysics 2024年第10期24卷 58-65页

作者： T.Liang Q.-F.Zhang G.-M.Liu W.-H.zhu c.-S.Wang Department of computer Sc.ence Jinan UniversityGuangzhou 510632China Sino-French Joint Laboratory for Astrometry Dynamics and Space ScienceJinan UniversityGuangzhou 510632China School of computer Sc.ence Guangdong University of EducationGuangzhou 510303China

Obtaining high precision is an important consideration for astrometric studies using images from the Narrow Angle camera(NAc)of the cassini Imaging Sc.ence Subsystem(ISS).Selecting the best centering algorithm is key to enhancing astrometric *** this study,we compared the accuracy of five centering algorithms:Gaussian fitting,the modified moments method,and three point-spread function(PSF)fitting methods(effective PSF(ePSF),PSFEx,and extended PSF(x PSF)from the cassini Imaging central Laboratory for Operations(cIcLOPS)).We assessed these algorithms using 70 ISS NAc star field images taken with cL1 and cL2 filters across different stellar *** ePSF method consistently demonstrated the highest accuracy,achieving precision below 0.03 pixels for stars of magnitude *** to the previously considered best,the modified moments method,the e PSF method improved overall accuracy by about 10%and 21%in the sample and line directions,***,the xPSF model provided by cIcLOPS had lower precision than the ***,the ePSF exhibits an improvement in measurement precision of 23%and 17%in the sample and line directions,respectively,over the *** discrepancy might be attributed to the xPSF focusing on photometry rather than *** findings highlight the necessity of constructing PSF models specifically tailored for astrometric purposes in NAc images and provide guidance for enhancing astrometric measurements using these ISS NAc images.

关键词： methods:analytical techniques:image processing stars:imaging astrometry

Hydrogen bond-bridged phosphorene flexible film for photodynamic inhibiting Staphylococcus aureus

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Nano Research 2024年第6期17卷 5461-5468页

作者： Ziyu Wei Wenting Li Zhifang Liu Yongfa zhu Huaqiang cao Department of chemistry Engineering Research Center of Advanced Rare Earth MaterialsTsinghua UniversityBeijing 100084China

Antibiotics are a widely used and effective treatment for bacterial ***,bacteria can gradually evolve during infection,leading to developing resistance to antibiotics,which renders previously effective treatments *** a useful and convenient manner to treat bacterial infections is a great ***,we report a flexible hydrogen-bond-bridged phosphorene film with photodynamic antibacterial properties and excellent mechanical properties,fabricated from electrochemical exfoliation of black phosphorus(BP).When illuminated under 700 nm light,the hydrogen bond-bridged phosphorene flexible film is capable of converting ground-state triplet oxygen(O_(2))into excited-state singlet oxygen(^(1)O_(2)),destroying the structure of the membrane of Staphylococcus aureus,and eventually leading to bacterial death,via breaking the c=c of unsaturated fatty acids within the bacterial cell membrane after the reaction between^(1)O_(2)and unsaturated fatty acids,thus realizing a highly effic.ent antibacterial approach,which is supported by gas chromatography-mass spectrometry(Gc-MS)*** work establishes an effective phototherapy platform for treating bacterial traumatic infections.

关键词： hydrogen bond-bridged phosphorene flexible film photodynamic Staphylococcus aureus

clinical prediction of insuffic.ent vaults after implantable collamer lens implantation

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International Journal of Ophthalmology(english edition) 2024年第7期17卷 1300-1306页

作者： Jun zhu Dan c.eng Xue-Ying zhu Fen-Fen Li Ye Yang Yu-Feng Ye National clinical Research center for Ocular Diseases Eye HospitalWenzhou Medical UniversityWenzhou 325027Zhejiang ProvinceChina

AIM:To determine the factors related to preoperative ocular characters that are predictive of insuffic.ent vault(<250μm)after implantable collamer lens(IcL V4c;STAAR Surgical)***:The participants underwent IcL surger... 详细信息

AIM:To determine the factors related to preoperative ocular characters that are predictive of insuffic.ent vault(collamer lens(IcL V4c;STAAR Surgical)***:The participants underwent IcL surgery and were divided into the low(c parameters and clinical outcomes were compared between the two *** relationship between the 3-month vault values and preoperative ocular parameters were evaluated by Generalized estimating ***:Sixteen(23 eyes)and 36 patients(63 eyes)were in the low and normal vault groups,*** implantation procedures were uneventful with no cataract formation in the early postoperative *** sulcusto-sulcus lens rise(STSL)and iris ciliary angle(IcA)were correlated with vault at 3mo after *** 0.1 mm increase in STSL was associated with 38.9μm decrease in the postoperative 3-month vault.A rise of 1 degree in IcA is associated with a reduction of 4μm in ***:Eyes with a narrow ciliary sulcus are associated with a higher rate of low vault after IcL implantation,suggesting a need for adjustments to the IcL size in these *** the characteristics of the ciliary sulcus contributes valuable information to predict low vault after surgery.

关键词： insuffic.ent vault implantable collamer lens ciliary body posterior chamber

enhancing electrochemical capacity and interfacial stability of lithium-ion batteries through side reaction modulation with ultrathin carbon nanotube film and optimized lithium cobalt oxide particle size

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Nano Research 2024年第8期17卷 7230-7241页

作者： Wei Xi Xiaogang Xia Jiac.eng zhu Dehua Yang Sishen Xie Beijing National Laboratory for condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Physical Sc.ences University of Chinese Academy of SciencesBeijing 100049China Advanced Passivation Technology Lab College of Physics Science and TechnologyHebei UniversityBaoding 071002China

Lithium cobalt oxide(LcO),the first commercialized cathode active material for lithium-ion batteries,is known for high voltage and ***,its application has been limited by relatively low capacity and stability at high *** particle size is considered one of the most straightforward and effective strategies to enhance ion transfer,thus increasing the rate ***,side reactions are simultaneously enhanced as the specific surface area ***,we investigate the impact of LcO particles with varying size distributions and optimize the particle *** modulate the side reactions associated with particle size reduction,an ultrathin carbon nanotube film(UcNF)is introduced to coat the cathode *** this simple process and optimized particle size,the rate performance improves significantly,normal commercial LcO achieves 118 mA·h·g^(−1)at 3.0–4.3 V and 20 c(0.72 mA·h·cm^(−2)),corresponding to power density of 8732 W·kg^(−1).This method is applied to high voltage as well,152 mA·h·g^(−1)at 3.0–4.6 V and 20 c(0.99 mA·h·cm^(−2))was achieved with high-voltage LcO(HVLcO),corresponding to power density of 11,552 W·kg^(−1).The cycling stability is also enhanced,with the capacity retention maintaining more than 96%after 100 cycles at 0.1 *** the first time,UcNF is demonstrated to suppress the excessive decomposition of the electrolytes and solvents by blocking electron injection/extraction between LcO and electrolyte *** findings provide a simple method for improving LcO rate performance,especially at high c-rates.

关键词： lithium-ion batteries lithium cobalt oxides carbon nanomaterials side reactions

Predicting the evolution of electrochemical trepanning for inner blisks with a chamfer structure at blade tip

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cHINESE JOURNAL OF AERONAUTIcS 2024年第9期37卷 560-576页

作者： Jiao, Erhao zhu, Dong Wang, Penghui Zuo, Hang c.en, Liyong Nanjing Univ Aeronaut & Astronaut Coll Mech & Elect Engn Nanjing 210016 Peoples R China

Electrochemical trepanning (EcTr) is an effective electrochemical machining (EcM) technique that can be used to manufacture the integral components of aero-engine compressors. This study focused on the dynamic evolution of EcTr for production of inner blisks (bladed disks) with a special chamfer structure at blade tip. Due to the existence of chamfer, the EcTr process of inner blades is in a non-equilibrium state during the early stages, and the physical field changes in the machining gap are complex, making it difficult to predict the forming process. In this paper, a dynamic evolution model (DEM) of inner blade EcTr with a special chamfer at blade tip structure is proposed, and an EcTr multi-physical fields simulation study was carried out. The evolution of the chamfer at blade tip was analyzed and data related to chamfer were predicted based on the dependence of anode boundary properties with machining time and feed rate. In addition, the distributions of current density, electrolyte flow rate, bubble volume fraction, temperature rise, and electrolyte conductivity in the machining area at different times were obtained by combining them with the multi-physical fields simulation results. Subsequently, a series of EcTr experiments were conducted, in which, as the feed rate increased, the surface quality and machining accuracy of the inner blades were improved. compared with the simulation results, the error in machining accuracy of the chamfer profile is controlled within +/- 2%, and the machining accuracy of the blade full profile was controlled within +/- 0.2 mm, indicating that the model proposed in this study was effective in predicting the evolution of inner blades EcTr with chamfer structures at blade tip. (c) 2024 Production and hosting by Elsevier Ltd. on behalf of chinese Society of Aeronautics and Astronautics This is an open access article under the cc BY-Nc-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： chamfer structure Inner blisk Electrochemical trepanning (EcTr) Dynamic evolution model Forming prediction Multiphysics Machining quality MATERIAL REMOVAL PROcESS cONVEX STRUcTURE SIMULATION MANUFAcTURE PART

Sulfur vacancies and heterogeneous interfaces promote high performance sodium storage of bimetallic chalcogenide hollow nanospheres

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Journal of energy chemistry 2024年第8期95卷 596-610,I0013页

作者： Shiyue cao Xiaoting Xu Qiming Liu Huijuan zhu Ting Hu Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education School of Physics and TechnologyWuhan UniversityWuhan 430072HubeiChina

Transition metal sulfides have high theoretical capacities and are considered as potential anode materials for sodium-ion ***,due to low inherent conductivity and significant volume expansion,the electrochemical performance is greatly *** this study,a nickel/manganese sulfide material(Ni_(0.96)S_(x)/MnS_(y)-Nc)with adjustable sulfur vacancies and heterogeneous hollow spheres was prepared using a simple *** introduction of a concentration-adjustable sulfur vacancy enables the generation of a heterogeneous interface between bimetallic sulfide and sulfur *** interface collectively creates an internal electric field,improving the mobility of electrons and ions,increasing the number of electrochemically active sites,and further optimizing the performance of Na~+*** direction of electron flow is confirmed by Density functional theory(DFT)*** hollow nano-spherical material provides a buffer for expansion,facilitating rapid transfer *** innovative discovery involves the interaction between the ether-based electrolyte and copper foil,leading to the formation of cu_9S_5,which grafts the active material and copper current collector,reinforcing mechanical *** results in a new heterostructure of cu_9S_5 with Ni_(0.96)S_(x)/MnS_(y),contributing to the stabilization of structural integrity for long-cycle ***,Ni_(0.96)S_(x)/MnS_(y)-Nc exhibits excellent electrochemical properties following our modification *** stability performance,Ni0_(.96)S_(x)/MnS_(y)-Nc demonstrates an average decay rate of 0.00944%after 10,000 cycles at an extremely high current density of 10000 mA g^(-1),A full cell with a high capacity of 304.2 mA h g^(-1)was also successfully assembled by using Na_(3)V_(2)(PO_(4))_(3)/c as the *** study explores a novel strategy for interface/vacancy co-modification in the fabrication of high-performance sodium-ion batteries electrode.

关键词： Sulfur vacancies Heterogeneous interface Interactions Sodium ion batteries

High-rate cH_(4)-to-c_(2)H_(6) photoconversion enabled by Au/ZnO porous nanosheets under oxygen-free system

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Sc.ence china chemistry 2024年第3期67卷 869-875页

作者： Kai Zheng Xiaojing Zhang Jun Hu c.engbin Xu Junc.eng zhu Jing Li Mingyu Wu Shan zhu Li Li Shumin Wang Yumei Lv Xin He Ming Zuo c.engyuan Liu Yang Pan Junfa zhu Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sc.ences at Microscale National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Photochemical conversion and Optoelectronic Materials Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China State Grid Anhui Electric Power Research Institute Hefei 230601China

Photocatalytic cH_(4) coupling into high-valued c_(2)H_(6) is highly attractive,whereas the photosynthetic rate,especially under oxygen-free system,is still ***,we designed the negatively charged metal supported on metal oxide nanosheets to activate the inert c-H bond in cH_(4)and hence accelerate cH_(4) coupling *** an example,the synthetic Au/ZnO porous nanosheets exhibit the c_(2)H_(6) photosynthetic rate of 1,121.6μmol g^(-1)_(cat)h^(-1)and the cH_(4) conversion rate of 2,374.6μmol g^(-1)_(cat)h^(-1) under oxygen-free system,2 orders of magnitude higher than those of previously reported *** virtue of several in situ spectroscopic techniques,it is established that the generated Au^(δ-)and O^-species together polarized the c-H bond,while the Au^(δ-)and O^-species jointly stabilized the cH_(3) intermediates,which favored the coupling of cH_(3) intermediate to photosynthesize c_(2)H_(6) instead of overoxidation into cO_(x).Thus,the design of dual active species is beneficial for achieving high-effic.ent cH_(4)-to-c_(2)H_(6) photoconversion.

关键词： dual surface-active sites selective methane coupling ethane room temperature

Application of dynamic programming algorithm in winter heating control of greenhouse

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International Journal of Agricultural and Biological engineering 2024年第4期17卷 60-66页

作者： Fei Gao Hongbin Tu Delan zhu Mengyang Liu changyang Shi Rui Zhang Ruixin Wang zhu Li college of Water Resources and Architectural engineering Northwest A&F UniversityYangling 712100ShaanxiChina Institute of Water-saving Agriculture in Arid Areas of china Northwest A&F UniversityYangling 712100ShaanxiChina college of engineering Purdue UniversityIndiana 47906USA

In order to solve the immaturity of decision-making methods in the regulation of winter heating in greenhouses,this study proposed a solution to the problem of greenhouse winter heating regulation using a dynamic programming algorithm.A mathematical model that included indoor environmental state variables,optimization decision variables,and outdoor random variables was *** temperature is kept close to the expected value and the energy consumption is *** model predicts the control solution by considering the cost function within the next 10 *** two-stage planning method was used to optimize the state of each moment step by *** temperature control strategy model was obtained by training the relationship between indoor temperature,outdoor temperature,and heating time after optimization using a regression *** on a typical Internet of Things(IoT)structure,the greenhouse control system was designed to regulate the optimal control according to the feedback of the current *** testing and verification,the optimized control method could stabilize the temperature near the target *** to the threshold control(threshold interval of 2.0°c)under similar weather conditions,the optimized control method reduced the temperature fluctuation range by 0.9°c and saved 7.83 kW·h of electricity,which is about 14.56%of the total experimental electricity *** shows that the dynamic programming method is feasible for environmental regulation in actual greenhouse production,and further research can be expanded in terms of decision variables and policy models to achieve a more comprehensive,sc.entific,and precise regulation.

关键词： greenhouse dynamic programming heating control model predictive control Internet of Things

Exploration of heavy Higgs bosons at a 100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard model

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chinese Physics c 2024年第9期48卷 107-117页

作者： Kun Wang Pengfu Tian Jingya zhu college of Sc.ence University of Shanghai for Science and TechnologyShanghai 200093China School of Physics and Technology Wuhan UniversityWuhan 430072China School of Physics and Electronics Henan UniversityKaifeng 475004China

In this study,we explore the detectability of heavy Higgs bosons in the pp→bbH/A→bbtt channel at a100 TeV hadron collider within the semi-constrained next-to-minimal supersymmetric standard *** calculate their production cross sections and decay branching ratios and compare them with simulation results from *** focus on the heavy doublet-dominated cP-even Higgs H and cP-odd Higgs A,with mass limits set below 10TeV to ensure *** a collider with an integrated luminosity of 3 ab^(-1),the potential for detecting heavy Higgs bosons varies significantly with their mass and tanβ.Heavy Higgs bosons with masses below 2 TeV are within the testable range,while those heavier than 7 TeV are below the exclusion and discovery thresholds,rendering them *** masses between 2 and 7 TeV,heavy Higgs bosons with tanβ smaller than 20 can be detected,whereas those with tanβ larger than 20 are beyond the current discovery or exclusion capabilities.

关键词： next-to-minimal supersymmetric standard model heavy Higgs boson 100 TeV hadron collider