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Robust microwave absorption in silver-cobalt hollow microspheres with heterointerfaces and electric-magnetic synergism:Towards achieving lightweight and absorption-type microwave shielding composites

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Journal of Materials Science & Technology 2023年第7期138卷 245-255页

作者： Dian Yang Jun-Ru Tao Yi Yang qian-ming He ming Wang Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China

Lightweight and high-efficiency microwave shielding materials based on high absorption loss are the hotspot of current ***,the silver-cobalt bimetallic hollow microspheres(Ag-Co-HM)with low reflection loss and broadband absorption efficiency were fabricated and then used to construct bimetallic hollow structures in polydimethylsiloxane/carbon nanotube composites(PDMS/CNT)to obtain the lightweight and absorption-type microwave shielding *** microwave absorption of Ag-Co-HM and the microwave shielding effectiveness(SE T)of the PDMS/CNT/Ag-Co-HM composites was evaluated and *** Ag-Co-HM with a molar ratio(Co/Ag)of 2.07 exhibited a low reflection loss as-46.6 dB at a thickness of 2.6 mm,and an effective absorption bandwidth of 8.40 *** SE T of the PDMS/CNT composites was greatly enhanced by the incorporation of the ***,the absorption coefficient(A)was also improved by adding the Ag-Co-HM and was much higher than the reflection *** composites exhibited absorption-type microwave shielding *** example,the average microwave SE T of 59.4 dB and A value of 0.78 are achieved in the PDMS/CNT/Ag-Co-HM composites containing 5 wt%CNTs and 10 wt%Ag-Co-HMs,which are much higher than the cor-responding values of 33.7 dB and 0.63 in the PDMS/CNT composites with only 5 wt%*** addition,the hollow structure of Ag-Co-HM endows the PDMS/CNT/Ag-Co-HM composites to have a low density.

关键词： Microwave shielding Absorption loss Lightweight Polydimethylsiloxane Carbon nanotube

Glycation of high-density lipoprotein triggers oxidative stress and promotes the proliferation and migration of vascular smooth muscle cells

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Journal of Geriatric Cardiology 2017年第7期14卷 473-480页

作者： qian DU ming-ming qian Pin-Li LIU Le ZHANG Yan WANG Dong-Hui LIU Department of Cardiology the Affiliated Cardiovascular Hospital of Xiamen University Medical College of Xiamen University Xiamen China Department of Endocrinology the Second Hospital of Hebei Medical University Shijiazhuang China

Background In type 2 diabetes mellitus （T2DM）, high-density lipoprotein （HDL） impairs its anti-atherogenic properties and even develops to a pro-inflammatory and pro-atherogenic phenotype because of abnormal compositions and modifications. In this study, we ex- amined the effects and the related mechanisms of glycation of HDL on the proliferation and migration of vascular smooth muscle cells （VSMCs）. Methods ＆ Results Glycated HDL （G-HDL） was modified with D-glucose （25 mmol/L） in vitro. Diabetic HDL （D-HDL） was isolated from T2DM patients. Rat VSMCs were isolated from the thoracic aortas. Human VSMCs were obtained from ScienCell Research Laboratories. Alpha-actin was detected through immunofiuorescence. VSMC proliferation was assayed by Cell Count. VSMC migration was determined by transwell chamber and scratch-wound assay. Intracellular reactive oxygen species （ROS） was detected based on ROS-medi- ated 2＇,7＇-dichlorofluorescein （DCFH-DA） fluorescence. Compared to native HDL （N-HDL）, G-HDL remarkably promoted VSMC prolif- eration and migration in the dose and time-dependent manners. In addition, G-HDL enhanced ROS generation in VSMCs. However, the ROS scavenger, N-acetylcysteine, efficiently decreased ROS production and subsequently inhibited the proliferation of VSMCs induced by G-HDL. Similarly, D-HDL from T2DM patients also promoted ROS release and VSMC proliferation and migration. Conclusions HDL either glycated in vitro or isolated from T2DM patients triggered VSMC proliferation, migration, and oxidative stress. These results might partly interpret the higher morbidity of cardiovascular disease in T2DM patients.

关键词： High-density lipoprotein Glycation Migration Proliferation Vascular smooth muscle cells

Bionic stab-resistant body armor based on triangular pyramid structure

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Defence Technology（防务技术） 2021年第3期17卷 792-799页

作者： Ya-xin Guo Meng-qi Yuan Xin-ming qian State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

A stab-resistant substrate was designed and realized with a triangular pyramidal structure, inspired by the biological armor model in nature. The stab-resistance behavior and dynamic response mechanisms were studied through numerical simulation and experimental testing of a knife impacting a substrate,and an optimal structural design was obtained accordingly, with a tilted angle of 22.5and optimal thickness of 1.2 mm. It was shown that the triangular pyramidal structure generated twice the internal energy of the knife than the flat substrate due to the dispersing effect of the structure. The force parallel to the inclination caused a significant scratch on the substrate surface, while the force perpendicular caused obvious substrate deformation. A new riveting method was used to form the total layer, which passed the GA 68-2008 standard. The stab-resistant clothing coupled with the reduced wearing burden could provide effective protection and avoid fatal injuries on security personnel working in dangerous environments. The method provided may enlighten the future design and manufacturing of stabresistant clothing.

关键词： Stab resistant Impact behavior Body armor Finite element analysis

The personal protective equipment(PPE)based on individual combat:A systematic review and trend analysis

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Defence Technology（防务技术） 2023年第10期28卷 195-221页

作者： qian-ran Hu Xing-yu Shen Xin-ming qian Guang-yan Huang Meng-qi Yuan State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing400044China

With the development of ordnance technology,the survival and safety of individual combatants in hightech warfare are under serious threat,and the Personal Protective Equipment(PPE),as an important guarantee to reduce casualties and maintain military combat effectiveness,is widely *** paper systematically reviewed various PPE based on individual combat through literature research and comprehensive discussion,and introduced in detail the latest application progress of PPE in terms of material and technology from three aspects:individual integrated protection system,traditional protection equipment,and intelligent protection equipment,respectively,and discussed in depth the functional improvement and optimization status brought by advanced technology for PPE,focusing on the achievements of individual equipment technology ***,the problems and technical bottlenecks in the development of PPE were analyzed and summarized,and the development trend of PPE were pointed *** results of the review will provide a forward-looking reference for the current development of individual PPE,and are important guidance for the design and technological innovation of advanced equipment based on the future technological battlefield.

关键词： Personal protective equipment(PPE) Individual combat Material and structure Equipment application Intelligent devices Wearable technology

Improving dispersion and delamination of graphite in biodegradable starch materials via constructing cation-π interaction: Towards microwave shielding enhancement

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Journal of Materials Science & Technology 2022年第34期129卷 196-205页

作者： Yi Yang Jun-Ru Tao Dian Yang qian-ming He Xu-Dong Chen ming Wang Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function Manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China Key Laboratory of Polymer Composite and Function Materials of Ministry of Education Key Laboratory for Designed Synthesis and Applied Polymer MaterialsSchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhou 510275China

Herein, a low-cost, biodegradable, and high-performance microwave shielding graphite/starch material was fabricated via constructing a cation-π interaction between ammonium ions and graphite. The graphite flakes and starch were firstly mixed with distilled water containing ammonium hydroxide to form graphite/starch slurry under an ultrasonic assistant. The cation-π interaction could improve delamination degree and dispersion of graphite in starch matrix. The slurry was first used as a coating material on the surface of wood and paper to develop shielding packages. The effect of coating thickness and coating layers on EM shielding property of the materials was investigated. Second, the composites with a high orientation of graphite were fabricated by compression at high pressures. The electrical conductivity and EM shielding effectiveness(SET) of the materials were greatly enhanced by construction of cation-πinteraction and orientation of graphite. Specifically, the EM SETvalues increased from 56.9 to 66.8 d B for the composites with 50 wt.% graphite and 2.0 mm in thickness by constructing cation-π interaction. The EM SETvalues raised from 17.4 to 66.8 d B via the graphite orientation in the materials with the same components and thickness. The shielding mechanism of the compressed composites with orientation dispersion of graphite was also discussed in comparison to the coating layer with random dispersion of graphite.

关键词： Electromagnetic shielding Graphite Starch Bio-degradable Cation-πinteraction

Application of Biological Nanopore Sequencing Technology in the Detection of Microorganisms

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Chinese Journal of Chemistry 2023年第23期41卷 3473-3483页

作者： ming-qian Zhang Xiao-Bin Huang Hai-Chen Wu Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living BiosystemsInstitute of ChemistryChinese Academy of SciencesBeijing100190 China University of Chinese Academy of Sciences Beijing100049 China

Environmental pollution and the spread of pathogenic microorganisms pose a significant threat to the health of humans and the ***,understanding and detecting microorganisms is crucial for maintaining a healthy living *** sequencing is a single-molecule detection method developed in the 1990s that has revolutionized various research *** offers several advantages over traditional sequencing methods,including low cost,label-free,time-saving detection speed,long sequencing reading,real-time monitoring,convenient carrying,and other significant *** this review,we summarize the technical principles and characteristics of nanopore sequencing and discuss its applications in amplicon sequencing,metagenome sequencing,and whole-genome sequencing of environmental microorganisms,as well as its in situ application under some special *** also analyze the advantages and challenges of nanopore sequencing in microbiology ***,nanopore sequencing has the potential to greatly enhance the detection and understanding of microorganisms in environmental research,but further developments are needed to overcome the current challenges.

关键词： Nanopore sequencing technology Environmental microorganisms Amplicon sequencing Metagenome sequencing Whole genome sequencing Gene technology Ion channels Nucleic acids

Expression, Purification, and Refolding of Recombinant Fusion Protein hIL-2/mGM-CSF

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Biomedical and Environmental Sciences 2008年第6期21卷 509-513页

作者： qian WEN LI MA WEI LUO ming-qian ZHOU XIAO-NING WANG Institute of Molecular Immunology Southern Medical University Guangzhou 510515 Guangdong China School of Biosciences and Bioengineering South China University of Technology Guangzhou 510641 Guangdong China

Objective To study the activities of interleukin （IL）-2 and granulocyte-macrophage colony-stimulating factor （GM-CSF）（hlL-2/mGM-CSF）. Methods SOE PCR was used to change the linker of the fusion protein for higher activities. The fusion protein was expressed in Escherichia coli （E. coil） BL21 （DE3） in inclusion body （IB） form. After IB was extracted and clarified, it was denatured and purified by affinity chromatography. The protein was refolded by dilution in a L-arginine refolding buffer and refined by anion chromatography. The protein activity was detected by cytokine-dependent cell proliferation assay. Results The expression of hIL-2/mGM-CSF in E. coli yielded approximately 20 mg protein/L culture and the purity was about 90%. The specific activities of IL-2 and GM-CSF were 5.4×10^6 IU/mg and 7.1×10^6 IU/mg, respectively. Conclusion This research provides important information about the anti-tumor activity of hIL-2/mGM-CSF in vivo, thus facilitating future clinical research on hlL-2/mGM-CSF used in immune therapy.

关键词： HIL-2/mGM-CSF Fusion protein Purification Refolding

Ethylene Oligomerization by (dppe)MCl_2 [M = Fe(II), Co(II),Ni(II)] Complexes/EAO

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Chinese Chemical Letters 2001年第12期12卷 1115-1118页

作者： Yu Liang ZHANG ming Xing qian Ren HE State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116012

The catalytic properties of a series of (dppe) MCl2 [M = Fe(II), Co(II), Ni(II)] in combination with EAO (ethylaluminoxane) for ethylene oligomerization have been investigated. Treatment of the bidentate phosphine metal complexes with EAO in toluene generated in situ active catalysts which catalyze oligomerizaton of ethylene to low-carbon olefins. The effects of reaction temperature, ratios of n(Al) : n(M) and reaction periods on catalytic activity and product distribution have been studied. The activity of cobalt complex with EAO at 200C was 4021 g/g(Co)h, and the selectivity of C4-10 olefins is 95.5%.

关键词： Ethylene oligomerization bidentate phosphine complexes EAO a-olefins.

Analysis,design,and experimental evaluation of power calculation in digital droop-controlled parallel microgrid inverters

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Journal of Zhejiang University-Science C(Computers and Electronics) 2013年第1期14卷 50-64页

作者： ming-zhi GAO Min CHEN Cheng JIN Josep M.GUERRERO Zhao-ming qian Department of Applied Electronics Zhejiang University Institute of Energy Technology Aalborg University

Parallel operation of distributed generation is an important topic for microgrids, which can provide a highly reliable electric supply service and good power quality to end customers when the utility is unavailable. However, there is a well-known limitation： the power sharing accuracy between distributed generators in a parallel operation. Frequency and voltage droop is a well-established control method for improving power sharing performance. In this method, the active and reactive power calcu- lations are used to adjust the frequency and amplitude of the output voltage. This paper describes the digital implementation of a droop method, and analyzes the influence of power calculation on droop method performance. According to the analysis, the performance of droop control in a digital control system is limited by the accuracy and speed of the power calculation method. We propose an improved power calculation method based onp-q theory to improve the performance of the droop control method, and we compare our new method with two traditional power calculation methods. Finally, simulation results and experimental results from a three single-phase l-kW-inverter system are presented, which validate the performance of our proposed method.

关键词： Distributed generators Distributed energy storages Microgrid Wireless parallel Droop control Digital controlsystem p-q theory