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One-step synthesis and electromagnetic absorption properties of high entropy rare earth hexaborides(HE REB6)and high entropy rare earth hexaborides/borates(HE REB6/HE REB03)composite powders

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Journal of Advanced Ceramics 2021年第1期10卷 62-77页

作者： Weiming zhang Biao ZHAO Huimin xiANG Fu-Zhi DAI Shijiang WU Yanchun zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046China Zibo Firststar New Material Incorporated Co. Ltd.Zibo 255000China

Considering the emergence of severe electromagnetic interference problems,it is vital to develop electromagnetic(EM)wave absorbing materials with high dielectric,magnetic loss and optimized impedance ***,realizing the synergistic dielectric and magnetic losses in a single phase material is still a ***,high entropy(HE)rare earth hexaborides(REB6)powders with coupling of dielectric and magnetic losses were designed and successfully synthesized through a facial one-step boron carbide reduction method,and the effects of high entropy borates intermedia phases on the EM wave absorption properties were *** HE REB6 ceramics including(Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B6,(Ce0.2Hu0.2Sm0.2Er0.2Yb0.2)B6,(Ce0.2Y0.2Eu0.2Er0.2Yb0.2)B6,(Ce0.2Ya2Sm0.2Eu0.2Yb0.2)B6,and(Nd0.2Y0.2Sm0.2Eu0.2Yb0.2)B6 possess CsCl-type cubic crystal structure,and their theoretical densities range from 4.84 to 5.25 g/cm^(3).(Ce02Y0.2Sm0.2Er0.2Yb02)B6 powders with the average particle size of 1.86 jim were found to possess the best EM wave absorption properties among these *** RLmin value of(Ce0.2Y0.2Sm0.2Er0.2Yb0.2)B6 reaches-33.4 dB at 11.5 GHz at thickness of 2 mm;meanwhile,the optimized effective absorption bandwidth(EAB)is 3.9 GHz from 13.6 to 17.5 GHz with a thickness of 1.5 *** introduction of HE REB03(RE=Ce,Y,Sm,Eu,Er,Yb)as intermediate phase will give rise to the mismatching impedance,which will further lead to the reduction of reflection ***,the HEREB6/HEREB03 still possess wide effective absorption bandwidth of 4.1 GHz with the relative low thickness of 1.7 *** the better stability,low density,and good EM wave absorption properties,HE REB6 ceramics are promising as a new type of EM wave absorbing materials.

关键词： high entropy rare earth hexaborides(HE REB6) one-step synthesis electromagnetic wave absorbing properties synergistic dielectric and magnetic losses wide effective absorption bandwidth

Prevalence of human papillomavirus in esophageal carcinoma in Tangshan,China

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World Journal of Gastroenterology 2015年第10期21卷 2905-2911页

作者： Mohammadreza Mohammadzad Mehryar Shu-Ying Li Hong-Wei Liu Fan Li Fang zhang yu-bai zhou Yi Zeng Jin-tao Li Beijing Key Laboratory of Environmental and Viral Oncology College of Life Science and Bio-EngineeringBeijing University of Technology Collaborative Innovation Center for Biotherapy West China HospitalSichuan University Department of Pathogenic Biology College of Basic Medicine Hebei United University Key Laboratory of Southwest China Wildlife Resources Conservation Ministry of EducationCollege of Life Sciences China West Normal University National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention and State Key Laboratory for Infectious Disease Prevention and Control

AIM:to study the prevalence of human papillomavirus(HPV) in esophageal carcinoma in tangshan,China,a high-incidence ***:Formalin-fixed,paraffin-embedded tissue specimens from 198 patients who were pathologically diagnosed with esophageal squamous cell carcinoma from 2011 to 2013 were obtained from a pathology department in *** was extracted from all198 specimens to detect HPV by polymerase chain reaction(PCR).β-globin PCR was performed to check the quality of the DNA extraction *** was performed to detect a wide range of HPV types,and type-specific PCR was performed to detect HPV types16 and *** and positive controls were used for HPV 16 and 18 ***:the DNA extraction method in this study appeared to be more effective than other previously reported *** DNA extraction,more than98%of the tissue specimens had an acceptable result in the DNA qualification test(β-globin PCR).the overall prevalence of HPV in tumor tissues by GP6+/GP5+PCR was 79.79%,and the prevalence of HPV types16 and 18 was 40.40%and 47.47%,*** demonstrated the presence of HPV,and direct sequencing confirmed the HPV *** HPVpositive PCR products were checked by DNA sequence analysis using DNAman and compared with the known HPV sequences listed in the basic Local Alignment Search tool database to evaluate the HPV *** analysis confirmed the presence of HPV types 16 ***:DNA of high-risk HPV types 16 and 18is present in esophageal tumors,implicating HPV as a possible etiologic factor for esophageal squamous cell carcinoma.

关键词： Esophageal carcinoma Formalin-fixed,paraffin-embed

Event-triggered Control of Positive Switched Systems with Actuator Saturation and Time-delay

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International Journal of Automation and computing 2021年第1期18卷 141-154页

作者： Jun-Feng zhang Lai-You Liu Shi-zhou Fu Shuo Li School of Automation Hangzhou Dianzi UniversityHangzhou 310018China Inria University of LilleLille 59000France

This paper investigates the event-triggered control of positive switched systems with randomly occurring actuator saturation and time-delay,where the actuator saturation and time-delay obey different Bernoulli ***,an event-triggering con-dition is constructed based on a 1-norm *** the presented event-triggering scheme,an interval estimation method is utilized to deal with the error term of the *** a co-positive Lyapunov functional,the event-triggered controller and the cone attraction domain gain matrices are designed via matrix decomposition *** positivity and stability of the resulting closed-loop systems are reached by guaranteeing the positivity of the lower bound of the systems and the stability of the upper bound of the systems,*** proposed approach is developed for interval and polytopic uncertain systems,***,two examples are provided to illustrate the effectiveness of the theoretical findings.

关键词： Positive switched systems event-triggered control randomly occurring actuator saturation linear programming time-delay

PTGS2 identified as a biomarker of glucocorticoid-induced osteonecrosis of the femoral head and an enhancer of osteogenesis

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Genes & Diseases 2023年第1期10卷 14-17页

作者： Qingyu zhang Shun Lu Dongsheng zhou Jun Dong Fanxiao Liu Department of Orthopaedics Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinanShandong 250021China

Due to the use of more adjuvant therapies and the increasing prevalence of associated diseases,nontraumatic osteonecrosis of the femoral head(ONFH)has become a substantial worldwide health issue;while glucocorticoid administration was the highest-ranked risk factor,with a proportion ranging from 26.35 to 55.75%.1 Albeit with similar radiological features,glucocorticoid-induced ONFH(GONFH)manifested a greater probability for advance-tolate-stage(post-collapse)lesions in comparison with its non-glucocorticoid-induced counterparts.i1 Therefore,an accurate and timely diagnosis of osteonecrosis following glucocorticoid therapy is of great significance to initiate nonoperative treatment regimens or joint-preserving procedures,slow disease progression,and defer or avert joint arthroplasty.

关键词： glucocorticoid diagnosis operative

3-D CFD simulation of transients in multiple pump system with some pumps being stopped

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Journal of Hydrodynamics 2021年第3期33卷 583-592页

作者： yue-fei Liu Jian-xu zhou Qiang Guo Ai-li Shen Jian zhang College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210024China

The computational fluid dynamics(CFD)approach can be used to obtain both internal and external characteristics of centrifugal pumps,and the variations of the hydrodynamic force,the pressure and the torque on the blades acquired by the CFD are highly associated with the safety of the pumping *** on the CFD simulations,this paper investigates the stopping characteristics of multiple pumps with some pumps being *** 3-D geometric model is built,including all 6 pumps,the valves,the pipes,the tanks and other components,and using the Realizable k-ε turbulence *** CFD results for the operating points agree well with the results from the theoretical *** some pumps being stopped,the key parameters of the operating pumps would not be stable,with a larger fluctuation;the direction of the hydrodynamic force might be opposite with more than 3 stopped *** the stopped pumps,the maximum reverse values of the discharge and the rotational speed would be larger when fewer pumps are stopped,and could be more than 120%of the rated values,which is dangerous for the pumping *** CFD results could help understanding the stopping process of multiple pump systems with some pumps being stopped.

关键词： Centrifugal pumps some pumps stop computational fluid dynamics(CFD) operating points maximum reverse value

Metalens-based stereoscopic microscope

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Photonics Research 2022年第6期10卷 1501-1508页

作者： YONG LONG JIANCHAO zhang ZHIHAO LIU WEIBIN FENG SONGMING GUO QIAN SUN QINFEI WU xiANGYANG yu JIANYING zhou EMILIANO RMARTINS HAOWEN liang JUNTAO LI State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China São Carlos School of Engineering Department of Electrical and Computer EngineeringUniversity of São PauloSão CarlosSP 13566-590Brazil

Stereoscopic microscopy is a promising technology to obtain three-dimensional microscopic *** microscopes are based on the parallax effect,and as such require two lenses to focus at two different *** constraints,however,restrict their numerical apertures to about 0.2,thus limiting the system’s *** numerical apertures(.35)can be achieved with designs using only one bulk lens,but such systems are0 times more costly than the conventional ***,there is a pressing need for alternative solutions to improve the resolution of stereoscopic ***,we show that high-resolution and low-cost stereoscopic systems can be obtained using birefringent single-layer *** design and fabricate a birefringent metalens operating at 532 nm with a numerical aperture as high as *** metalens is then used to demonstrate high-resolution stereoscopic imaging of biological *** microscopic images are further displayed and perceived vividly in an autostereoscopic *** demonstration paves the way to a new strategy to achieve high-resolution and low-cost stereoscopic microscopes.

关键词： resolution ens stereoscopic

Micro/nano multiscale reinforcing strategies toward extreme high-temperature applications:Take carbon/carbon composites and their coatings as the examples

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Journal of Materials Science & Technology 2022年第1期96卷 31-68页

作者： Qiangang Fu Pei zhang Lei Zhuang Lei zhou Jiaping zhang Jie Wang xianghui Hou Ralf Riedel Hejun Li State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Fiber Reinforced Light Composite MaterialsCarbon/Carbon Composites Research CenterNorthwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Faculty of Engineering University of NottinghamUniversity ParkNottingham NG72RDUnited Kingdom Institut für Materialwissenschaft Technische Universität DarmstadtOtto-Berndt-Straße 3Darmstadt D-64287Germany

Carbon fiber reinforced carbon composites(C/Cs),are the most promising high-temperature materials and could be widely applied in aerospace and nucleation fields,owing to their superior ***,C/Cs are very susceptible to destructive oxidation and thus fail at elevated *** matrix modification and coating technologies with Si-based and ultra-high temperature ceramics(UHTCs)are valid to enhance the oxidation/ablation resistance of C/Cs,it’s not sufficient to satisfy the increasing practical applications,due to the inherent brittleness of ceramics,mismatch issues between coatings and C/C substrates,and the fact that carbonaceous matrices are easily prone to high-temperature *** effectively solve the aforementioned problems,micro/nano multiscale reinforcing strategies have been developed for C/Cs and/or the coatings over the past two decades,to fabricate C/Cs with high strength and excellent high-temperature *** review is to systematically summarize the most recent major and important advancements in some micro/nano multiscale strategies,including nanoparticles,nanowires,carbon nanotubes/fibers,whiskers,graphene,ceramic fibers and hybrid micro/nano structures,for C/Cs and/or the coatings,to achieve high-temperature oxidation/ablation-resistant C/***,this review is concluded with an outlook of major unsolved problems,challenges to be met and future research advice for C/Cs with excellent comprehensive mechanical-thermal ***’s hoped that a better understanding of this review will be of high scientific and industrial interest,since it provides unusual and feasible new ideas to develop potential and practical C/Cs with improved high-temperature mechanical and oxidation/ablation-resistant properties.

关键词： Carbon/carbon composites Micro/nano multiscale reinforcing strategies Oxidation Ablation Erosion Hybrid structures

Experimental Study for the Cementation Effect of Dust Soil by Using Soybean Urease

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Journal of Renewable Materials 2023年第6期11卷 2893-2911页

作者： Jianwei zhang yue Yin Lei Shi Yi Han Mi zhou xihong zhang School of Civil Engineering and Architecture Henan UniversityKaifeng475004China College of Civil and Transportation Engineering Hohai UniversityNanjing210024China State Key Laboratory of Subtropical Building Science South China University of TechnologyGuangzhou510640China School of Civil and Mechanical Engineering Curtin UniversityBentley6102Australia

Dust is an environmental and health *** this study,a new technology for dust suppressant is introduced using soybean urease with an optimal cementing *** carbonate is produced by soybean urease and cementing solution,which bonds the soil particles towards a dust suppressant.A laboratory wind tunnel test is carried out to examine its effectiveness and discover possible optimization *** factors,including soybean meal concentration,cementing solution concentration,and volume of solution per unit area,are examined to quantify their influences on soil transport mass,evaporation ratio,evaporation rate,surface strength,water retention ratio,and infiltration rate of soil treated by different dust *** tests are conducted to explore the performance of this method in the natural *** results show that compared with other dust suppressants,the optimized soybean urease has the smallest evaporation rate,a moderate infiltration rate,the largest water retention ratio and surface *** indexes of soybean urease for dust suppressant are found to be better than traditional *** the natural environment,soybean urease has a stronger anti-disturbance *** study concludes that soybean urease dust suppressant has great application potential as a cheap and green method.

关键词： Soybean urease dust suppressant wind erosion evaporation rate surface strength

An in-situ NH_(4)^(+)-etched strategy for anchoring atomic Mo site on ZnIn_(2)S_(4) hierarchical nanotubes for superior hydrogen photocatalysis

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Science China Chemistry 2021年第10期64卷 1716-1722页

作者： yuguang Chao Weiyu zhang Peng zhou Hui Chen Shiyu Lu Menggang Li Qinghua zhang Lin Gu Shaojun Guo School of Materials Science and Engineering Peking UniversityBeijing 100871China Institute of Physics Chinese Academy of SciencesBeijing 100190China Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT) College of EngineeringPeking UniversityBeijing 100871China

Atomic sites co-catalyst (ASC) on photocatalytic materials possesses an attractive prospect to promote charge carrier separation and tune surface reaction kinetics,yet the synthesis of earth-abundant ASC under low temperature remains a great ***,a novel in-situ NH_(4)^(+)-etched strategy to anchor atomic Mo sites on ZnIn_(2)S_(4)hierarchical nanotubes (HNTs) with abundant mesopores under mild conditions for promoting charge carrier separation and enhancing light multi-reflections is developed for efficient photocatalytic H_(2) *** functional theory calculations and linear sweep voltammetry demonstrate that the well-defined Mo-S_(2)O_(1) sites with distinctive coordination configuration and electronic property contribute to the enhanced separation of photo-generated charge carriers and reduced Gibbs free energy for H_(2) ***,the well-defined MoSA-ZIS HNTs present an excellent photocatalytic activity with a rate of 29.9μmol h^(-1)(5.98 mmol g^(-1)h^(-1)),which is 7.3 times higher than that of ZnIn_(2)S_(4)nanosheets (NSs),to be among the best ZnIn_(2)S_(4)-based *** present strategy breaks the high-temperature limitation of conventional top-down thermal dissociation/emitting approach for anchoring non-noble metal atomic sites on catalyst support.

关键词： in-situ NH_(4)^(+)-etched hierarchical nanotubes Mo single atoms photocatalytic H_(2)evolution