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Global existence and large-time behavior for primitive equations with the free boundary

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Science China Mathematics 2024年第10期67卷 2303-2330页

作者： hai-liang li Chuangchuang liang School of Mathematical Sciences Capital Normal UniversityBeijing 100048China Academy for Multidisciplinary Studies Capital Normal UniversityBeijing 100048China College of Mathematics and Statistics Chongqing UniversityChongqing 401331China

In the present paper, the primitive equations, which can be used to simulate the large-scale motion of the ocean and atmosphere, are considered in the three-dimensional domain bounded below by a fixed solid boundary and above by a free-moving boundary. The global existence and uniqueness of strong solutions are established, and the long-time convergence to the equilibrium state is shown to be either at an exponential rate for the horizontal periodic domain or at an algebraic rate for the horizontal whole space.

关键词： primitive equations the free boundary value problem global well-posedness large-time behavior

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Fluorescence analysis of antibiotics and antibiotic-resistance genes in the environment: A mini review

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Chinese Chemical Letters 2024年第10期35卷 82-91页

作者： Yuxin li Chengbin liu Qiuju li Shun mao College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Institute for Agri-food Standards and Testing Technology Shanghai Academy of Agricultural SciencesShanghai 201403China

Antibiotics,as widely used antibacterial drug,exist in various environmental *** residues can affect biological metabolism and lead to bacterial resistance and the formation of antibiotic-resistance genes,posing a threat to human health and ecological *** efficient detection methods for antibiotics and antibiotic-resistance genes has great environmental *** detection methods,due to their fast response,high sensitivity and specificity,and low-cost,are widely used in chemical and biological *** review first summarizes the pre-treatment methods for different types of environmental samples,and then focuses on the recent advances of fluorescence methods for the detection of antibiotics and antibiotic-resistance ***,main challenges and future research directions of fluorescence methods for antibiotic and antibiotic-resistance genes detection are *** review highlights the promising prospect of fluorescence methods in-situ detection and monitoring of antibiotics and antibiotic-resistance genes,and provides guidance for the construction of overall risk assessment system of environmental media.

关键词： Antibiotics Antibiotic-resistancegenes Fluorescence detection Environmental samples In-situdetection

Psychological intervention based on social cognitive theory: Treating pain, anxiety, and depression in perioperative patients

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World Journal of Psychiatry 2024年第8期14卷 1199-1207页

作者： hai-Jian mao lin-Fei Wang Chun lin Department of Surgical Anesthesiology The First People’s Hospital of Lin’an DistrictHangzhouHangzhou 311300Zhejiang ProvinceChina Department of Gastrointestinal Surgery Hangzhou First People’s HospitalHangzhou 310006Zhejiang ProvinceChina Department of Comprehensive Intervention The First People’s Hospital of Lin’an DistrictHangzhouHangzhou 311300Zhejiang ProvinceChina

BACKGROUND Surgery is an effective method for treating certain *** such as disease,preoperative fear and tension,surgical stress,postoperative pain,and related complications directly affect the smooth progression and outcome of *** may experience a series of psychological and physiological changes during the perioperative period,resulting in anxiety and depression,which may reduce the pain threshold and worsen their *** We enrolled 200 patients who underwent surgical care at The First People’s Hospital of lin’an District,Hangzhou between January and December *** were categorized into a routine intervention group(n=103)and a psychological intervention group(n=97),based on the intervention strategies *** assessment tools,including the self-rating anxiety scale(SAS),the self-rating depression scale(SDS),and the Connor–Davidson Resilience scale,were used to measure patients’negative states and *** pre-and post-intervention scores for these metrics in the two groups were then *** In the psychological intervention group,the SAS and SDS scores(31.56±5.18 and 31.46±4.57,respectively)were significantly reduced compared to the routine intervention group(Pliance(22.63±2.91),optimism(11.42±1.98),and resilience(70.13±5.37),compared to the routine intervention group(Plity of life(P<0.05).CONCLUSION

关键词： Perioperative period Social cognitive theory Psychological intervention Pain Anxiety and depression

Fatigue-resistant Hydrogels

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Chemical Research in Chinese Universities 2024年第1期40卷 64-77页

作者： li Luofei LEI hai CAO Yi Collaborative Innovation Center of Advanced Microstructures National Laboratory of Solid State MicrostructureDepartment of PhysicsNanjing UniversityNanjing 210093P.R.China Department of Physics Zhejiang UniversityHangzhou 310027P.R.China

Hydrogels have been extensively studied for applications in various fields, such as tissue engineering and soft robotics, as determined by their mechanical properties. The mechanical design of hydrogels typically focuses on the modulus, toughness, and deformability. These characteristics play important roles and make great achievements for hydrogel use. In recent years, a growing body of research has concentrated on the fatigue property of hydrogels, which determines their resistance to crack propagation in the networks during cyclic mechanical loads for applications. However, knowledge of hydrogel fatigue behavior remains notably deficient. Here, we present a brief overview of the fatigue behavior of hydrogels, encompassing the general experimental methods to measure the fatigue property and fundamental theoretical calculation models. Then, we highlight multiple strategies to enhance the fatigue resistance of hydrogels. Finally, we present our perspectives on fatigue-resistant hydrogels, outstanding challenges and potential directions for future research.

关键词： Hydrogel Fatigue-resistant Fracture

Simulation of RFI Cancellation Using Subspace Projection Algorithm for PAF Receiver

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Research in Astronomy and Astrophysics 2024年第1期24卷 237-244页

作者： Peng Wu Jian li mao-Zheng Chen Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Xinjiang Key Laboratory of Microwave Technology Urumqi 830011China

The simulation of radio frequency interference(RFI) cancellation by applying a spatial filtering technique for phased array feed(PAF) is presented. In order to better reflect the characteristics of PAF, a new signal model is to add the coupling coefficient among elements of PAF to the conventional array signal model. Then the subspace projection(SP) algorithm is used to cancel RFI from the correlation matrix of the signal, and finally, the 2D power image is drawn. The power variation of signal-of-interest direction and RFI direction before and after using the SP algorithm is analyzed. The new signal model and simulation strategy can be used to test and verify the beamformer.

关键词： methods:analytical techniques:radar astronomy telescopes

Extraction of Valuable Metals from Titanium-bearing Blast Furnace Slag by Acid Leaching

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 376-385页

作者：刘燕 CHEN Xuegui mao Shuaidong XIAO Yadong li Jiacong School of Metallurgy Northeastern UniversityShenyang 110819China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education Shenyang 110819China

To realize the resource utilization of the valuable metals in the titanium-containing blast furnace slag,the process route of “hydrochloric acid leaching-electrolysis-carbonization and carbon dioxide capture-preparation of calcium carbonate” was *** this study,the influences of process conditions on the leaching rates of calcium,magnesium,aluminum,and iron and the phases of the leaching residue were investigated for the leaching *** experimental results show that the HCl solution could selectively leach the elements from the titanium-containing blast furnace *** better leaching conditions are the HCl solution concentration of 4 mol/L,the leaching time of 30 min,the ratio of liquid volume to solid gas of 10 mL/g,and the stirring paddle speed of 300 r/*** the conditions,the leaching rates of calcium,magnesium,aluminum,and iron can reach 85.87%,73.41%,81.35%,and 59.08%,and the leaching rate of titanium is 10.71%.The iron and the aluminum are removed from the leachate to obtain iron-aluminum water purification agents,and the magnesium is removed from the leachate to obtain magnesium *** leaching residue phase is dominated by perovskite,followed by magnesium silicate and tricalcium aluminate,and the titaniumrich material could be obtained from the leaching residue by desiliconization.

关键词： titanium-containing blast furnace slag acid leaching valuable metals comprehensive utilization

A Multi-Token Sector Antenna Neighbor Discovery Protocol for Directional Ad Hoc Networks

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China Communications 2024年第7期21卷 149-168页

作者： Zhang Hang li Bo Yan Zhongjiang Yang mao li Xinru School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710072China The 54th Research Institute of CETC Shijiazhuang 050081China

In this paper,we propose a Multi-token Sector Antenna Neighbor Discovery(M-SAND)protocol to enhance the efficiency of neighbor discovery in asynchronous directional ad hoc *** central concept of our work involves maintaining multiple tokens across the *** prevent mutual interference among multi-token holders,we introduce the time and space non-interference ***,we propose a master-slave strategy between *** the master token holder(MTH)performs the neighbor discovery,it decides which 1-hop neighbor is the next MTH and which 2-hop neighbors can be the new slave token holders(STHs).Using this approach,the MTH and multiple STHs can simultaneously discover their neighbors without causing interference with each *** on this foundation,we provide a comprehensive procedure for the M-SAND *** also conduct theoretical analyses on the maximum number of STHs and the lower bound of multi-token generation ***,simulation results demonstrate the time efficiency of the M-SAND *** compared to the QSAND protocol,which uses only one token,the total neighbor discovery time is reduced by 28% when 6beams and 112 nodes are employed.

关键词： multi-token neighbor discovery SAND protocol sector antenna ad hoc network

Clinical characteristics and treatment compounds of obesity-related kidney injury

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World Journal of Diabetes 2024年第6期15卷 1091-1110页

作者： Tuo-Hua mao Han-Qi Huang Chuan-hai Zhang Department of Endocrinology Renmin Hospital of Wuhan UniversityWuhan 430060Hubei ProvinceChina Department of Endocrinology Hubei No.3 People’s Hospital of Jianghan UniversityWuhan 430033Hubei ProvinceChina Department of Physiology UT Southwestern Medical CenterDallasTX 75390United States

Disorders in energy homeostasis can lead to various metabolic diseases,particularly *** obesity epidemic has led to an increased incidence of obesityrelated nephropathy(ORN),a distinct entity characterized by proteinuria,glomerulomegaly,progressive glomerulosclerosis,and renal function *** and its associated renal damage are common in clinical practice,and their incidence is increasing and attracting great *** is a great need to identify safe and effective therapeutic modalities,and therapeutics using chemical compounds and natural products are receiving increasing ***,the summary is lacking about the specific effects and mechanisms of action of compounds in the treatment of *** this review,we summarize the important clinical features and compound treatment strategies for obesity and obesityinduced kidney *** also summarize the pathologic and clinical features of ORN as well as its pathogenesis and potential therapeutics targeting renal inflammation,oxidative stress,insulin resistance,fibrosis,kidney lipid accumulation,and dysregulated *** addition,detailed information on natural and synthetic compounds used for the treatment of obesity-related kidney disease is *** synthesis of detailed information aims to contribute to a deeper understanding of the clinical treatment modalities for obesity-related kidney diseases,fostering the anticipation of novel insights in this domain.

关键词： Compounds Obesity Kidney injury Obesity-related nephropathy Clinical features and treatment

A Rendezvous Mission to the Second Earth Trojan Asteroid 2020 XL_5 with Low-Thrust Multi-Gravity Assist Techniques

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Research in Astronomy and Astrophysics 2024年第1期24卷 245-264页

作者： Shi-hai Yang Bo Xu Xin li School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518107China

As the second of Earth's Trojan asteroids, 2020 XL_(5) is worthy of rendezvous and even sample return missions in many aspects. In this paper, a rendezvous mission to Earth's second Trojan asteroid 2020 XL_(5) is ***, due to its high inclination and large eccentricity, direct impulsive transfer requires large amounts of fuel consumption. To address this challenge, we explore the benefits of electric propulsion and multi-gravity assist techniques for interplanetary missions. These two techniques are integrated in this mission design. The design of a low-thrust gravity-assist(LTGA) trajectory in multi-body dynamics is thoroughly investigated,which is a complex process. A comprehensive framework including three steps is presented here for optimization of LTGA trajectories in multi-body dynamics. The rendezvous mission to 2020 XL_(5) is designed with this three-step approach. The most effective transfer sequence among the outcomes involves Earth–Venus–Earth–Venus-2020 XL_(5). Numerical results indicate that the combination of electric propulsion and multi-gravity assists can greatly reduce the fuel consumption, with fuel consumption of 9.03%, making it a highly favorable choice for this rendezvous mission.

关键词： minor planets asteroids:general celestial mechanics Planetary Systems