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An overview and perspective of identifying lunar craters

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Science China Earth Sciences 2024年第5期67卷 1395-1416页

作者： yan JIANG Changyi xu Ling chen State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100029China Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100049China

The spatiotemporal evolution of lunar impact craters is crucial for investigating lunar interior structure,internal and external dynamic processes,and interplanetary impact *** in lunar crater identification are reviewed based on topography and gravity data,and the features and mechanisms of topographic or buried craters are analyzed regarding morphology,gravity anomalies,gravity gradients,and the underlying crust-mantle interface *** on the compiled crater catalog,the early lunar impact flux and thermal evolution are further discussed according to the basin ages and their interior *** some ancient impact basins,the crater size-frequency distribution measurements revealed age discrepancies from previous studies,suggesting that the lunar late heavy bombardment event started at~3.95 *** degraded bulge structures of the crust-mantle interface beneath mare basins reveal that these basins formed on the lunar crust surface under high-temperature conditions and underwent prolonged relaxation compared to highland ***,we reveal that the up-to-date identification of lunar buried craters remains inaccurate and incomplete,preventing us from accurately reconstructing lunar and interplanetary impact ***,we propose that a gravity model constructed using localized orthogonal basis functions can be useful for identifying lunar craters.

关键词： Moon Gravity field Craters Impact flux Early evolution

Klebsiella pneumoniae infection secondary to spontaneous renal rupture that presents only as fever:A case report

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World Journal of Clinical Cases 2021年第11期9卷 2602-2610页

作者： chen-Guang Zhang Min Duan Xiang-yang Zhang yan Wang Sheng Wu Li-Li Feng Lin-Lin Song xu-yan chen Department of Emergency Medicine Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China

BACKGROUND Spontaneous renal rupture is a rare disease in the *** causes of spontaneous renal rupture include extrarenal factors,intrarenal factors,and idiopathic *** on infection secondary to spontaneous renal rupture and the complications of spontaneous renal rupture are ***,there are few patients with spontaneous renal rupture who present only with *** SUMMARY We present the case of a 52-year-old female patient who was admitted to our *** presented only with fever,and the cause of the disease was *** underwent a contrast-enhanced computed tomography(CT)scan,which showed that the left renal capsule had a crescent-shaped,low-density shadow;the perirenal fat was blurred,and exudation was visible with no sign of calculi,malignancies,instrumentation,or *** ultrasound guidance,a pigtail catheter was inserted into the hematoma,and fluid was drained and used for the bacterial test,which proved the presence of Klebsiella *** months later,abdominal CT showed that the hematoma was absorbed,so the drainage tube was *** abdominal CT was normal after 4 *** Spontaneous renal rupture due to intrarenal factors causes a higher proportion of shock and is more likely to cause anemia.

关键词： Spontaneous Renal rupture Klebsiella pneumoniae Fever Infection Case report

1-Methyl-3-octylimidazolium Polyoxomolybdate Ionic Liquid with Low Melting Point and High Stability:Preparation and Photocatalytic Activity

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Chemical Research in Chinese Universities 2011年第2期27卷 177-180页

作者： DONG Tao xu yan-qing chen Fa-wang CHI Ying-nan HU Chang-wen State Key Laboratory of Explosion Science and Technology Department of ChemistryInstitute for Chemical Physics Beo＇ing Institute of Technology Beijing 100081 P R. China

The polyoxometalate（POM）-imidazole ionic liquid（IL） [C8mim]2[Mo6O19]（C8mim=1-methyl-3-octylimi- dazolium） with a low melting point of 82.6 °C was successfully prepared and characterized by FTIR, XPS, NMR, TG and so on. The polyoxomolybdate-based IL has high stability, and its decomposing temperature reaches 321 °C, which is higher than that of 1-alkyl-3-methylimidazolium halides IL. Further photocatalytic performances of the IL were measured via degrading dye rhodamine B（RB） in aqueous solution under the UV light irradiation. The experiments show that the conversion of RB reaches 80.5% after 90 min under UV-light and the degradation efficiency depends on the pH value of the solution, irradiation time and the dosage of the IL and so on.

关键词： Ionic liquid Polyoxomolybdate Low melting point High stability Photocatalytic activity

Hierarchical porous metal-organic frameworks/polymer microparticles for enhanced catalytic degradation of organic contaminants

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Frontiers of Chemical Science and Engineering 2022年第6期16卷 939-949页

作者： Ping Zhang Yi-Han Li Li chen Mao-Jie Zhang yang Ren yan-xu chen Zhi Hu Qi Wang Wei Wang Liang-Yin Chu College of Engineering Sichuan Normal UniversityChengdu 610101China School of Chemical Engineering Sichuan UniversityChengdu 610065China

This work reports on a simple microfluidic strategy to controllably fabricate uniform polymeric microparticles containing hierarchical porous structures integrated with highly accessible catalytic metal organic frameworks for efficient degradation of organic ***(W1/O)/W2 emulsion droplets generated from microfluidics are used as templates for the microparticle *** emulsion droplets contain tiny water microdroplets from homogenization and water nanodroplets from diffusion-induced swollen micelles as the dual pore-forming templates,and Fe-based metal-organic framework nanorods as the *** obtained microparticles possess interconnected hierarchical porous structures decorated with highly accessible Fe-based metal-organic framework nanorods for enhanced degradation of organic contaminants via a heterogeneous Fenton-like *** a degradation performance is highlighted by using these microparticles for efficient degradation of rhodamine B in hydrogen peroxide *** work provides a simple and general strategy to flexibly combine hierarchical porous structures and catalytic metal-organic frameworks to engineer advanced microparticles for water decontamination.

关键词： metal-organic framework polymer microparticle nanocatalyst decontamination organic contaminant

Preparation of wood-based hydrogel membranes for efficient purification of complex wastewater using a reconstitution strategy

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Frontiers of Environmental Science & Engineering 2024年第7期18卷 59-72页

作者： Qian He Junkai Gao Zhongzhi chen Yuanjing Ding Mengsheng Xia Pengtao xu yan chen School of Naval Architecture and Maritime Zhejiang Ocean UniversityZhoushan 316022China InnoTech Alberta P.O.Box 4000Hwy 16A&75 StreetVegrevilleAB T9C 1T4Canada

To avoid resource wastage and secondary environmental pollution,recycling and reusing waste wood powder is still a great ***,the poor viscosity and irregular pore size of wood powder limit its practical *** study,employed a green and convenient wood powder reconstitution strategy to achieve highly adhesive bonding and pore size control between wood powder particles,thus preparing a high-strength and super hydrophilic wood powder *** wood powder fibers were partially dissolved and regenerated to create a reconstituted wood powder hydrogel membrane,using waste wood powder as the raw *** wood powder reconstitution strategy offers advantages such as environmental friendliness,simplicity,cost-effectiveness,and strong ***,the materials exhibit excellent self-cleaning properties and *** by gravity,the membrane can purify oily wastewater and ***,the reconstitution strategy offers a new pathway for recycling wood powder.

关键词： Wood powder Reconstitution strategy Hydrogel membrane Recycling Wastewater

Brucellosis of unknown origin with haemophagocytic syndrome:A case report

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World Journal of Clinical Cases 2021年第15期9卷 3649-3654页

作者： Li-Hong Tian Zhi-Gao Dong xu-yan chen Lian-Jiang Huang Ping-Ping Xiao Department of Hematology and Rheumatology The Second Affiliated Hospital of Xiamen Medical CollegeXiamen 361021Fujian ProvinceChina Department of Laboratory The Second Affiliated Hospital of Xiamen Medical CollegeXiamen 361021Fujian ProvinceChina

BACKGROUND Brucellosis is a contagious bacterial disease caused by Brucella species,which is a leading zoonotic disease *** patients with brucellosis have a clear infection source;however,our case had a rare presentation of secondary haemophagocytic lymphohistiocytosis without any epidemiological *** SUMMARY A 50-year-old man was admitted to our hospital with a fever of unknown *** laboratory examinations,such as blood culture and bone marrow biopsy,the patient was diagnosed with brucellosis and secondary haemophagocytic *** antibiotic therapy,the patient was afebrile,and his haemogram recovered to normal,after which he was *** Brucellosis cannot be excluded in patients with clinically unexplained fever,even in those without epidemiologic history.

关键词： Brucella Brucellosis Haemophagocytic syndrome Haemophagocytic lymphohistiocytosis Fever Case report

Flexible assistance strategy of lower limb rehabilitation exoskeleton based on admittance model

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Science China(Technological Sciences) 2024年第3期67卷 823-834页

作者： KOU JianGe WANG Yixuan chen ZhenLei SHI yan GUO Qing xu Meng School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China School of Aeronautics and Astronautics University of Electronic Science and Technology of ChinaChengdu 611731China Department of Musculoskeletal Tumor Senior Department of Orthopedicsthe Fourth Medical Centerof PLA GeneralHospitalBeijing 100853China

Exercise training based on exoskeleton is an effective rehabilitation method for stroke patients. However, some rehabilitation exoskeletons still have poor wearable performance and obvious human-robot impedance during training, which easily cause secondary injuries to the patients. In this study, a variable admittance control strategy is proposed to improve the operator's wearable comfort, which can adapt to different operators by regulating admittance parameters. The admittance controller has two feedback loops: the position inner-loop and the admittance outer-loop. Meanwhile, the exoskeleton Lagrange model is constructed with unknown friction disturbance. By using Lyapunov technique and backstepping with state observer, the joint position error of exoskeleton is convergence into a zero neighborhood. The effectiveness of the proposed admittance controller is verified by both simulation and experiment. The tracking error of hip and knee joint is less than 4 degrees while the human-robot interaction torque is constrained in a tolerable range of the operator.

关键词： human-robot interaction exoskeleton backstepping admittance control

Treatment for CD57-negativeγδT-cell large granular lymphocytic leukemia with pure red cell aplasia:A case report

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World Journal of Clinical Cases 2021年第26期9卷 7818-7824页

作者： Ping-Ping Xiao xu-yan chen Zhi-Gao Dong Jin-Mei Huang Qing-Qing Wang Yong-Quan chen Yi Zhang Department of Hematology and Rheumatology The Second Affiliated Hospital of Xiamen Medical CollegeXiamen 361021Fujian ProvinceChina

BACKGROUND T-cell large granular lymphocytic leukemia(T-LGLL)is a rare type of aplastic anemia with diverse clinical *** diseases are often present at the first *** describe the treatment of a patient with CD57-negativeγδT-LGLL with pure red cell aplasia(PRCA).CASE SUMMARY A 34-year-old woman with a 20-year history of anemia visited our hospital owing to severe dizziness and was *** condition was diagnosed as CD57-negativeγδT-LGLL with PRCA through bone marrow cytology,bone marrow pathology,bone marrow flow cytometry,bone marrow multiplex polymerase chain reaction combined with fluorescent fragment analysis,and other *** with prednisone,methotrexate,and subcutaneous erythropoietin did not significantly change her hemoglobin *** treatment with oral cyclophosphamide for 3 mo,her hemoglobin level increased to approximately 100 g/*** 5 mo of treatment,the patient could perform activities of daily living *** The treatment of CD57-negativeγδT-LGLL with PRCA with cyclophosphamide helps to improve prognosis.

关键词： Large granular lymphocytic leukemia Pure red cell aplasia Aplastic anemia γδT-cell Cyclophosphamide Case report

Thermal fatigue and wear of compacted graphite iron brake discs with various thermomechanical properties

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China Foundry 2024年第3期21卷 248-256页

作者： Gui-quan Wang Zhuo xu Zhong-li Liu Xiang chen yan-xiang Li School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005ShandongChina School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China

The increase in payload capacity of trucks has heightened the demand for cost-effective yet high performance brake *** this work,the thermal fatigue and wear of compacted graphite iron brake discs were investigated,aiming to provide an experimental foundation for achieving a balance between their thermal and mechanical *** graphite iron brake discs with different tensile strengths,macrohardnesses,specific heat capacities and thermal diffusion coefficients were produced by changing the proportion and strength of *** peak temperature,pressure load and friction coefficient of compacted graphite iron brake discs were analyzed through inertia friction *** morphology of thermal cracks and 3D profiles of the worn surfaces were also *** is found that the thermal fatigue of compacted graphite iron discs is determined by their thermal properties.A compacted graphite iron with the highest specific heat capacity and thermal diffusion coefficient exhibits optimal thermal fatigue *** of the matrix at low temperatures significantly weakens the function of alloy strengthening in hindering the propagation of thermal *** the reduced hardness,increasing the ferrite proportion can mitigate wear loss resulting from low disc temperatures and the absence of abrasive wear.

关键词： compacted graphite iron brake disc thermomechanical properties thermal fatigue wear