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Optimized deployment of a radar network based on an improved firefly algorithm

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Frontiers of Information Technology & Electronic Engineering 2019年第3期20卷 425-437页

作者： Xue-jun zhang Wei JIA Xiang-min guan Guo-qiang XU jun CHEN Yan-bo ZHU National Key Laboratory of CNS/ATM School of Electronic and Information EngineeringBeihang University Department of General Aviation Civil Aviation Management Institute of China Lincoln School of Engineering University of LincolnBrayford Pool Campus

The threats and challenges of unmanned aerial vehicle(UAV) invasion defense due to rapid UAV development have attracted increased attention recently. One of the important UAV invasion defense methods is radar network detection. To form a tight and reliable radar surveillance network with limited resources, it is essential to investigate optimized radar network deployment. This optimization problem is difficult to solve due to its nonlinear features and strong coupling of multiple constraints. To address these issues, we propose an improved firefly algorithm that employs a neighborhood learning strategy with a feedback mechanism and chaotic local search by elite fireflies to obtain a trade-off between exploration and exploitation abilities. Moreover, a chaotic sequence is used to generate initial firefly positions to improve population diversity. Experiments have been conducted on 12 famous benchmark functions and in a classical radar deployment scenario. Results indicate that our approach achieves much better performance than the classical firefly algorithm(FA) and four recently proposed FA variants.

关键词： Improved firefly algorithm Radar surveillance network Deployment optimization Unmanned aerial vehicle (UAV) invasion defense

Bimodal TBCs with low thermal conductivity deposited by a powder-suspension co-spray process

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Journal of Materials Science & Technology 2018年第8期34卷 1293-1304页

作者： Wei-Wei zhang guang-Rong Li Qiang zhang guan-jun Yang Guo-Wang zhang Hong-Min Mu State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China School of Materials Science and Engineering Chang'an UniversityXi'an 710064China Institute of Publication Science Chang'an UniversityXi'an 710064China AECC Beijing Institute of Aeronautical Material Beijing 100095China

Advanced thermal harrier coatings （TBCs） with better thermal barrier performance are required by both advanced gas turbine and air engine. In this work, novel bimodal TBCs with low thermal conductivity were deposited and characterized by a novel co-spray approach with both solid powder and suspension. Experimental and finite element analyses were used to optimize the process parameters to prepare the specific morphology nanostructure features. With a comprehensive understanding on the influence of spraying parameters on the morphology ofnano-particles, homogeneous nano-particle heaps with a large aspect ratio were introduced to conventional layered coatings by plasma co-spraying with suspension and solid powder. Co-sprayed bimodal microstructure composite coatings resulted from both wet suspension droplets and molten particle droplets exhibited low thermal conductivity. The thermal conductivity of the composite coating was 1/5 lower than that of the counterpart coatings by conventional plasma spraying with solid powder. This study sheds light to the structural tailoring towards the advanced TBCs with low thermal conductivity.

关键词： Thermal barrier coatings Aspect ratioBimodal microstructure Thermal conductivity Co-spray process

Applications of single-atom catalysts

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Nano Research 2022年第1期15卷 38-70页

作者： Qiaoqiao zhang Jingqi guan Institute of Physical Chemistry College of ChemistryJilin UniversityChangchun 130012China

Owing to unsaturated coordination environment,quantum size effect and metal-support interaction,single-or dual-atom metal sites,such as Mn,Fe,Co,Ni,Cu,Zn,Mo,Ru,Rh,Pd,Ag,Sn,Ir,Pt,Au,Bi,and Er coordinated with nonmetallic elements such as O,N,P,and S,exhibit different electronic configurations,which endow them with high catalytic performances in multiple redox reactions and versatile applications in organic synthesis,environmental remediation,energy conversion,and *** intense research,the relation of structure-activity for single-atom catalysts(SACs)still bedazzles researchers,since diversified configurations of active sites would bring about difficulty in structural identification and theoretical ***,recent results on the applications of SACs are reviewed with an emphasis on identifying the active sites and discussing the relation between structure and property.

关键词： biomedicine energy conversion environmental remediation organic synthesis single-atom catalysis

Applications of Atomically Dispersed Oxygen Reduction Catalysts in Fuel Cells and Zinc–Air Batteries

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Energy & Environmental Materials 2021年第3期4卷 307-335页

作者： Qiaoqiao zhang Jingqi guan Key Laboratory of Surface and Interface Chemistry of Jilin Province College of ChemistryJilin UniversityChangchun 130021China

Due to severe energy crisis and environmental problems,green and renewable electrochemical energy devices such as fuel cells and metal–air batteries have attracted great attention,where oxygen reduction reaction(ORR)plays a vital *** rational design of efficient and robust singleatom catalysts(SACs)is vital but challenging toward ***,recent developments of single-atom ORR catalysts in fuel cells and Zn–air batteries are systematically summarized,focusing on transition-metal-based electrocatalysts including single or dual Fe,Co,Ni,Cu,Zn,Pd,Ag,and Pt *** the atomic level,different synthesis methods and characterization techniques are *** studies of ORR mechanisms are *** active sites and structure–property relationships of SACs for ORR are highlighted,and the performances of proton exchange membrane fuel cells(PEMFCs),anion exchange membrane fuel cells(AEMFCs),and Zn–air batteries are *** great challenges and future directions of SACs in fuel cells and Zn–air batteries are presented.

关键词： fuel cells oxygen reduction single-atom catalysts theoretical calculations zinc-air batteries

Ganoderic acid A protects lens epithelial cells from UVB irradiation and delays lens opacity

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Chinese Journal of Natural Medicines 2020年第12期18卷 934-940页

作者： KANG Li-Hua zhang Guo-Wei zhang jun-Fang QIN Bai guan Huai-Jin Eye Institute Affiliated Hospital of Nantong UniversityNantong 226000China

A contributory role of oxidative stress and protection by antioxidant nutrients have been suspected in cataract *** acid A(GAA),an effective lanostane triterpene,is widely reported as an *** aim of this study is to investigate the potential effects of GAA on cataract *** lens epithelial cells(LECs)were exposed to UVB radiation for different periods,cell viability,apoptosis-related protein levels,malondialdehyde(MDA)and superoxide dismutase(SOD)activities were *** found that cell viability,the Bcl-2/Bax ratio and SOD activity were increased,while Cleaved caspase-3 levels and MDA activity were decreased compared with those in UVB-impaired LECs after GAA ***,GAA activated PI3 K/AKT in UVB-impaired LECs and effectively delayed the occurrence of lens opacity in *** conclusion,these findings demonstrated that GAA exhibited protective functions in SRA01/04 cells and rat lenses against UVB-evoked impairment through elevating cell viability and antioxidant activity,inhibiting cell apoptosis,activating the PI3 K/AKT pathway and delaying lens opacity.

关键词： Ganoderic acid A Cataract Lens epithelial cells Cell vitality Apoptosis

Is it possible to foot reflexology for infants with sensorineural hearing loss?

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World Journal of Clinical Cases 2025年第2期13卷 1-4页

作者： Min Ai Hang-Hang zhang jun-Bang Feng Chuan-Ming Li Wen-Jing Wang Meng-Die Hu Department of Anesthesiology Nanan District People's Hospital of ChongqingChongqing 400060China Department of Breast and Thyroid Surgery Chongqing Bishan District Maternal and Child Health Care HospitalChongqing 402760China Department of Medical Imaging Chongqing University Central HospitalChongqing 400014China

Foot reflexology is a non-invasive and safe complementary therapy that works by massaging the reflex zones of the feet and exerts systemic or whole-body regulation through meridian nerve *** therapy is commonly used in the treatment of various conditions such as autism and Parkinson's ***,there is limited reporting on the use of foot reflexology therapy for infants with sensorineural hearing loss(SNHL).Currently,there is no definitive conclusion on how foot reflexology therapy can influence *** editorial holds some guiding significance regarding this clinical *** aim is to present physiological evidence of how foot reflexology therapy can impact infants with SNHL,thereby enhancing clinician’s awareness of foot reflexology in treating infants with SNHL.

关键词： Foot reflexology Sensorineural Hearing Loss Future perspectives Limitations Neural conduction

An optimized micro-assay of myosin Ⅱ ATPase activity based on the molybdenum blue method and its application in screening natural product inhibitors

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Chinese Journal of Natural Medicines 2016年第6期14卷 421-426页

作者： CHEN Hong-Lin ZHAO Jing zhang guan-jun KOU jun-Ping YU Bo-Yang Jiangsu Key Laboratory of TCM Evaluation and Translational Research Department of Complex Prescription of TCM China Pharmaceutical University

Myosin Ⅱ plays multiple roles in physiological and pathological functions through its ATPase activity. The present study was designed to optimize a micro-assay of myosin Ⅱ ATPase activity based on molybdenum blue method, using a known myosin Ⅱ ATPase inhibitor, blebbistatin. Several parameters were observed in the enzymatic reaction procedure, including the concentrations of the substrate(ATP) and calcium chloride, p H, and the reaction and incubation times. The proportion of coloration agent was also investigated. The sensitivity of this assay was compared with the malachite green method and bioluminescence method. Additionally, 20 natural compounds were studied for myosin Ⅱ ATPase inhibitory activity using the optimized method. Our results showed that ATP at the concentration of 5 mmol·L^(-1) and ammonium molybdate : stannous chloride at the ratio of 15 : 1 could greatly improve the sensitivity of this method. The IC50 of blebbistatin obtained by this method was consistent with literature. Compound 8 was screened with inhibitory activity on myosin Ⅱ ATPase. The optimized method showed similar accuracy, lower detecting limit, and wider linear range, which could be a promising approach to screening myosin Ⅱ ATPase inhibitors in vitro.

关键词： Myosin Ⅱ ATPase activity Blebbistatin Bioluminescence Natural products Malachite green

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

Effect of organic moieties(phenyl,naphthalene,and biphenyl)in Zr-MIL-140 on the hydrogenation activity of Pd nanoparticles

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Chinese Chemical Letters 2016年第11期27卷 1679-1682页

作者： Jie Yang Jian-jun Ma Da-Min zhang Teng Xue Ye-jun guan School of Mathematics and Physics Shanghai University of Electric Power Shanghai Key Laboratory of Green Chemistry and Chemical Processes East China Normal University

MIL-140-type metal organic frameworks （isoreticular zirconium oxide MOFs） with different aromatic moieties （phenyl, naphthalene, and biphenyl） have been synthesized and employed as the supports of palladium nanoparticles （Pd NiPs）. The catalysts were characterized by XRD, BET, TEM and CO chemisorption. The results reveal that Pd NPs are homogeneously dispersed on all materials whereas different accessibility to CO is observed. The hydrogenation performance in C=C saturation with respect to the effect of the aromatic moiety is compared. The Pd/MIL-140A MOF with the highest hydrogenation activity among the three catalysts comprised of different aromatic rings points to a unique Pd-π interaction between Pd and frameworks consisting of mono-phenyl groups （C6H4）.

关键词： Metal-organic-framework Palladium Selective hydrogenation Zirconium