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Multiphase flow physics of room temperature liquid metals and its applications

Science China(Technological Sciences) 2023年第6期66卷 1483-1510页

作者： qiao MengWen XING ZeRong FU jun-Heng LIU Jing CAS Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Beijing Key Laboratory of Cryo-Biomedical Engineering Beijing 100190China College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa’an 625014China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijing 100084China

Multiphase flow existing everywhere in the motion evolution of nature,industrial processes,and daily life,has been an interdisciplinary cutting-edge frontier covering rather diverse *** multiphase flow of high melting metals typically involves gas/vapor-liquid two-phase fluidics which usually requests intense energy processes and therefore limits their applications to a large *** from this,the newly emerging room-temperature liquid metals(RTLMs)with fascinating metallic fluidic properties and multifunctional behaviors,not only well resolve the existing challenges facing conventional technologies,but also open up a series of new scientific and engineering *** the conceptual introduction of multiphase composites endows liquid metal with many unconventional fluidic *** further push forward the advancement of this new area,the present article is dedicated to systematically outlining the scientific category of RTLMs multiphase flow physics and interpreting its fundamental and practical *** vision is to provide insights into promising developmental directions of RTLMs multiphase flow and thus facilitate synergetic research and progress among different ***,the traditional metal multiphase flow was briefly ***,we summarized the physics of RTLMs multiphase flow,the common types of liquid metals,the basic physical and chemical properties of their multiphase flow and governing equations,*** that,various typical driving modalities and manipulation methods of RTLMs were ***,important implementations of RTLMs multiphase flow into thermal management,energy harvesting,catalysis,soft machines,biomedicine,and printed electronics were ***,the multiphase flow physics of RTLMs is currently still in its incubation stage and there exist tremendous opportunities and challenges which are worth further pursuing in the coming time.

关键词： room-temperature liquid metals multiphase flow physics composite solution nanofluids fluid mechanics micro-/nanodroplets

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Persistent alterations in gray matter in COVID-19 patients experiencing sleep disturbances:a 3-month longitudinal study

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Neural Regeneration Research 2025年第10期20卷 3013-3024页

作者： Kaixuan Zhou Gaoxiong Duan Ying Liu Bei Peng Xiaoyan Zhou Lixia Qin Lingyan Liang Yichen Wei Qingping Zhang Xiaocheng Li Haixia Qin Yinqi Lai Yian lu Yan Zhang Jiazhu Huang Jinli Huang Yinfei Ouyang Bolin Bin Mingming Zhao jun Liu Jianrong Yang Demao Deng Guangxi Key Laboratory of Special Biomedicine School of MedicineGuangxi UniversityNanningGuangxi Zhuang Autonomous RegionChina Department of Radiology the People’s Hospital of Guangxi Zhuang Autonomous RegionGuangxi Academy of Medical SciencesNanningGuangxi Zhuang Autonomous RegionChina Department of Sleep Medicine the People’s Hospital of Guangxi Zhuang Autonomous RegionNanningGuangxi Zhuang Autonomous RegionChina Department of Radiology The Second Xiangya HospitalCentral South UniversityChangshaHunan ProvinceChina Guangxi Clinical Research Center for Sleep Medicine the People’s Hospital of Guangxi Zhuang Autonomous RegionNanningGuangxi Zhuang Autonomous RegionChina

Sleep disturbances are among the most prevalent neuropsychiatric symptoms in individuals who have recovered from severe acute respiratory syndrome coronavirus 2 *** studies have demonstrated abnormal brain structures in patients with sleep disturbances who have recovered from coronavirus disease 2019(COVID-19).However,neuroimaging studies on sleep disturbances caused by COVID-19 are scarce,and existing studies have primarily focused on the long-term effects of the virus,with minimal acute phase *** a result,little is known about the pathophysiology of sleep disturbances in the acute phase of *** address this issue,we designed a longitudinal study to investigate whether alterations in brain structure occur during the acute phase of infection,and verified the results using 3-month follow-up data.A total of 26 COVID-19 patients with sleep disturbances(aged 51.5±13.57 years,8 women and 18 men),27 COVID-19 patients without sleep disturbances(aged 47.33±15.98 years,9 women and 18 men),and 31 age-and gender-matched healthy controls(aged 49.19±17.51 years,9 women and 22 men)were included in this *** COVID-19 patients with sleep disturbances were included in a longitudinal *** found that COVID-19 patients with sleep disturbances exhibited brain structural changes in almost all brain *** cortical thicknesses of the left pars opercularis and left precuneus were significantly negatively correlated with Pittsburgh Sleep Quality Index ***,we observed changes in the volume of the hippocampus and its subfield regions in COVID-19 patients compared with the healthy *** 3-month follow-up data revealed indices of altered cerebral structure(cortical thickness,cortical grey matter volume,and cortical surface area)in the frontal-parietal cortex compared with the baseline in COVID-19 patients with sleep *** findings indicate that the sleep disturbances patients had altered morphology in the cortical an

关键词： brain structure cortical gray matter volume cortical surface area cortical thickness hippocampus magnetic resonance imaging Pittsburgh Sleep Quality Index severe acute respiratory syndrome coronavirus 2 infections sleep disturbances sub-cortical volume

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Convergence analysis of the corrected Uzawa algorithm for symmetric saddle point problems

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Applied Mathematics(A Journal of Chinese Universities) 2014年第1期29卷 29-35页

作者： lu jun-feng Hangzhou Institute of Commerce Zhejiang Gongshang University

For the large sparse saddle point problems, Pan and Li recently proposed in [H. K. Pan, W. Li, Math. Numer. Sinica, 2009, 31（3）： 231-242] a corrected Uzawa algorithm based on a nonlinear Uzawa algorithm with two nonlinear approximate inverses, and gave the detailed convergence analysis. In this paper, we focus on the convergence analysis of this corrected Uzawa algorithm, some inaccuracies in [H. K. Pan, W. Li, Math. Numer. Sinica, 2009, 31（3）： 231-242] are pointed out, and a corrected convergence theorem is presented. A special case of this modified Uzawa algorithm is also discussed.

关键词： Saddle point problem Uzawa algorithm convergence analysis

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Preparation and Properties of Organically Modified Sepiolite/High-performance Epoxy Nanocomposites

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Chinese Journal of Aeronautics 2006年第B12期19卷 41-46页

作者： lu Hai-jun Aerospace Institute of Special Materials and Technology Beifing 100074 China

Fibrous organic sepiolites （OSEP） and novel epoxy/OSEP nanocomposites were prepared, and different methods were investigated to produce an intercalated/exfoliated structure of OSEP. Experimental results show that the modifier molecules can be easily adsorbed by the sepiolite, but the layer space （d001 of the sepiolite, linked by means of covalent bond, remains unchanged. A proper method to solve this problem appears to exert large shearing force on the original sepiolite followed by its organic modification （OSEP2）. The morphology observation shows that there are formed an even dispersion of nano-sized OSEP2 fibers in epoxy resin and a structure intercalated by epoxy molecules, which lead to significantly improved mechanical properties. Impact strength of the epoxy/OSEP2 nanocomposite increases from 32.1 kJ/m^2 to 44.4 kJ/m^2, 38.3% higher than that of pristine matrix with 3 wt% OSEP2 content. It is also noted that the flexural strength of the OSEP/epoxy composites has risen by about 3% higher than that of the pure epoxy resin.

关键词： sepiolite intercalation/exfoliation epoxy nanocomposites

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A THEORETIC METHOD TO PREDICT POLYMER SOluBILITY PARAMETERS

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Chinese Journal of Polymer Science 2007年第2期25卷 203-206页

作者： Qing Ji Bao-fu qiao De-lu Zhao State Key Laboratoryof Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

A partition function and a complete thermodynamic description for pure polymer fluids have been investigated based on a self-avoid-walk lattice model. Caused by the introduction of Gibbs distribution into the Flory-Huggins theory, the partition function and the thermodynamic description depicted their dependence on temperature well. In the present study, we applied the theory to calculate polymer solubility parameters. The polymer solubility parameters predicted by our theory are well consistent with the experiment values.

关键词： Polymer Solubility parameters Gibbs distribution.

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Tests and Simulation Analysis on Fracture Performance of Concrete

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Journal of Wuhan University of Technology(Materials Science) 2013年第3期28卷 527-534页

作者：胡少伟 lu jun Nanjing Hydraulic Research Institute

To obtain the fracture parameters of concrete, fracture tests were conducted with three-point bending beam method aiming at 30 concrete beams with different sizes and different intensity. The concrete specimen with prefabricated crack to determine the fracture parameters of concrete were conducted and the fracture performance of the specimen was analyzed. The test results show that, initial fracture toughness is unrelated to the size of specimens; while unstable fracture toughness is related to the size of specimens. As for specimens of bastard size, when concrete intensity is relatively low, unstable fracture toughness increases along with the increase of intensity; when concrete intensity is relatively high, unstable fracture toughness will decrease; when concrete intensity increases continuously, unstable fracture toughness will further increase somewhat. As for specimens of standard size, unstable fracture toughness will increase along with the increase of intensity. Aiming at concrete beam specimens, we conducted two-dimensional non-linear finite element analysis, obtained the stress intensity factor, and carried out contrastive analysis with the experimental results.

关键词： concrete beam fracture performance fracture toughness acoustic emission mode damage variable

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f-Harmonic maps of doubly warped product manifolds

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Applied Mathematics(A Journal of Chinese Universities) 2013年第2期28卷 240-252页

作者： lu Wei-jun Center of Mathematical Sciences Zhejiang University School of Science Guangxi University for Nationalities

In this paper,we study f-harmonicity of some special maps from or into a doubly warped product *** we recall some properties of doubly twisted product *** showing that the inclusion maps from Riemannian manifolds M and N into the doubly warped product manifold M ×（μ,λ） N can not be proper f-harmonic maps,we use projection maps and product maps to construct nontrivial f-harmonic *** we obtain some similar results given in [21],such as the conditions for f-harmonicity of projection maps and some characterizations for non-trivial f-harmonicity of the special product ***,we investigate non-trivial f-harmonicity of the product of two harmonic maps.

关键词： f-harmonic map doubly warped product manifold projection map product map.

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Experimental study of the azimuthal performance of 3D acoustic transmitter stations

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Petroleum Science 2016年第1期13卷 52-63页

作者： Xiao-Hua Che Wen-Xiao qiao Xiao-Dong Ju jun-Qiang lu Jin-Ping Wu Ming Cai State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Key Laboratory of Earth Prospecting and Information Technology China University of Petroleum

Better well logging techniques for geologic investigations are urgently needed to identify and evaluate complex *** describe a new type of 3D transmitter station with corresponding circuits and *** can be used in a promising new technique of acoustic reflection well logging,that features better azimuthal detection capabilities,as well as better investigation *** transmitter stations consist of three-level subarrays that can radiate acoustic energy in any required azimuth of 3D space by circularly exciting various combinations at different *** tested the 3D acoustic transmitter stations and obtained laboratory directivity measurements with the3 D acoustic transmitter stations for the first *** results show that the 3-d B beam width in the horizontal plane ranges from 59° to 67° as a result of phase-delayed *** main beam is steered in the vertical plane at a deflection angle that ranges from 0° to 16° when the delay time of the excitation pulse between each pair of adjacent arc arrays is gradually *** 3-d B beam width is equal to 11°,whereas the deflection angle in the vertical plane is equal to 14°.Each of the four third-level subarrays in the same circumferential direction display consistent horizontal and vertical directivities,thus satisfying the requirements of azimuthal acoustic reflection logging.

关键词： transmitter deflection logging urgently geologic satisfying azimuth exciting excitation formations

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First observation results of Macao Science Satellite-1 on lightning-induced electron precipitation

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Science China Earth Sciences 2025年第1期 1-10页

作者： Yongping WANG Yixin SUN Qiugang ZONG Gaopeng lu Xudong GU Ze-jun HU Bin LI Key Laboratory for Polar Science Ministry of Natural Resources Polar Research Institute of China Institute of Space Physics and Applied Technology Peking University State Key Laboratory of lunar and Planetary Science Macau University of Science and Technology School of Earth and Space Sciences University of Science and Technology of China School of Electronic Information Wuhan University

The Medium-energy Electron Spectrometers(MES) is a space-borne instrument onboard Macao Science Satellite-1(MSS-1) dedicated to monitoring the typical charged particle radiation characteristics in the satellite orbit and the process of their occurrence and development, including short bursts of lightning-induced electron precipitation(LEP).This paper presents the first results of the LEP measurements by the MSS-1.47 LEP events are identified with the routine operation for 3 months since satellite launch, all within the range of 1.5

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Review of Three-phase Soft Switching Inverters and Challenges for Motor Drives

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CES Transactions on Electrical Machines and Systems 2024年第2期8卷 177-190页

作者： Haifeng lu qiao Wang Jianyun Chai Yongdong Li IEEE the Department of Electrical Engineering Tsinghua UniversityBeijing 100084China the School of Electrical Engineering Xinjiang UniversityUrumqi 830047China

For electric vehicles (EVs),it is necessary to improve endurance mileage by improving the *** exists a trend towards increasing the system voltage and switching frequency,contributing to improve charging speed and power ***,this trend poses significant challenges for high-voltage and high-frequency motor controllers,which are plagued by increased switching losses and pronounced switching oscillations as consequences of hard *** deployment of soft switching technology presents a viable solution to mitigate these *** paper reviews the applications of soft switching technologies for three-phase inverters and classifies them based on distinct *** each type of inverter,the advantages and disadvantages are ***,the paper introduces the research progress and control methods of soft switching inverters (SSIs).Moreover,it presents a comparative analysis among the conventional hard switching inverters (HSIs),an active clamping resonant DC link inverter (ACRDCLI) and an auxiliary resonant commuted pole inverter (ARCPI).Finally,the problems and prospects of soft switching technology applied to motor controllers for EVs are put forward.

关键词： Soft switching inverters Zero-voltage switching Electric vehicles Motor drives

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