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Synthesis and characterization of (Ni,Sb)-co-doped rutile ceramic pigment via mechanical activation-assisted solid-state reaction

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Particuology 2018年第6期16卷 20-29页

作者： Shi Zhang Zhidong Pan Yanmin Wang School of Materials Science and Engineering South China University of TechnologyGuangzhou 510640China

(Ni,Sb)-co-doped rutile yellow ceramic pigments were synthesized via a mechanical activation-assisted solid-state reaction in a stirred bead *** effects of mechanical grinding of the raw materials on the synthesis of (Ni,Sb)-co-doped rutile pigment were *** results show that mechanical activation effectively decreased the crystallinity of the mixed precursors,thus enhancing their reactivity and the migration rate of *** effects lowered the temperature required for formation of the rutile *** with results from a mixture of separately ground precursors,the mixture of raw materials ground together was more effective for accelerating nickel/antimony ions doping into the TiO2structure and improved the color performance of the *** pigment from the mixed raw materials ground for 2.0h and heat-treated at 1100℃ could be used as an environmentally-friendly ceramic yellow pigment owing to its low-toxicity,bright yellow hue,good chemical/thermal durability, and high cost-effectiveness.

关键词： Mechanical activation Solid-state synthesis (Ni,Sb)-co-doped rutile Ceramic pigment

Route planning of truck and multi-drone rendezvous with available time window constraints of drones

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Science china(Technological Sciences) 2022年第9期65卷 2190-2204页

作者： LIANG ChengYuan LUO Xin CHEN XueDong HAN Bin School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China guangdong Intelligent Robotics Institute Dongguan 523808China

During the scenarios of cooperative tasks performed by a single truck and multiple drones,the route plan is prone to failure due to the unpredictable scenario *** this situation,it is significant to replan the rendezvous route of the truck and drones as soon as possible,to ensure that all drones in flight can return to the truck before running out of *** paper addresses the problem of rendezvous route planning of truck and *** to the available time window constraints of drones,which limit not only the rendezvous time of the truck and drones but also the available period of each drone,there are obvious local optimum phenomena in the investigated problem,so it is difficult to find a feasible solution.A two-echelon heuristic algorithm is *** the algorithm,the strategy jumping out of the local optimum and the heuristic generating the initial solution are introduced,to improve the probability and speed of obtaining a feasible solution for the rendezvous *** results show that the feasible solution of the truck-drones rendezvous route can be obtained with 88%probability in an average of 77 iterations for the scenario involving up to 25 *** influence of algorithm options on planning results is also analyzed.

关键词： truck and multi-drone rendezvous route planning available time window two-echelon heuristic strategy jumping out of local optimum

Distribution of per-and polyfluoroalkyl substances in blood,serum,and urine of patients with liver cancer and associations with liver function biomarkers

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Journal of Environmental Sciences 2024年第5期139卷 418-427页

作者： Cao Dai Lin Peng Yanjie Li Zhendong Li Da Chen Fei Wang Nan Lin Department of Hepatobiliary Surgery The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China School of Environment Guangdong Key Laboratory of Environmental Pollution and HealthJinan UniversityGuangzhou 510632China State Key Laboratory of Environmental and Biological Analysis Department of ChemistryHong Kong Baptist UniversityHong Kong 999077China South china Institute of Environmental Sciences MEEGuangzhou 510655China

Studies have shown that per-and polyfluoroalkyl substances(PFASs)may be hepatotoxic in animals or ***,data on clinical epidemiology are very *** this study,21PFASs were determined in patients with liver diseases,with the highest median concentrations detected in the serum sample(26.7 ng/mL),followed by blood(10.7 ng/mL)and urine(5.02 ng/mL).Higher total PFAS concentrations were found in hepatocellular carcinoma(HCC)patients compared to non-HCC patients,with significant discrepancies in serum and blood ***,significant correlations were also found among PFAS concentrations and age,gender,body mass index(BMI),and liver function biomarkers *** example,PFAS concentrations are significantly higher in males than in females;Several serum PFASs concentrations increase with age and BMI,while the serum perfluorohexane sulfonic acid(PFHxS)concentrations are negatively correlated with *** addition,multiple regression models adjusted for age,gender and BMI found that increased serum perfluorobutane sulfonic acid(PFBS),perfluoroheptane sulfonic acid(PFHpS)and perfluorohexylphosphonic acid(PFHxPA)conentrations are correlated with elevated alkaline phosphatase(ALP),aspartate aminotransferase(AST),and alpha-fetoprotein(AFP)(p<0.05).Our results provide epidemiological support for the future study on the potential clinical hepatotoxicity of PFAS.

关键词： Per-and polyfluoroalkyl substances(PFASs) Liver cancer Serum Blood Urine Liver function biomarkers

Silicon cuboid nanoantenna with simultaneous large Purcell factor for electric dipole,magnetic dipole and electric quadrupole emission

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Opto-Electronic Advances 2022年第2期5卷 13-21页

作者： Qiurong Deng Jianfeng Chen Li Long Baoqin Chen Huakang Yu Zhiyuan Li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China

The Purcell effect is commonly used to increase the spontaneous emission rate by modifying the local environment of a light ***,we propose a silicon dielectric cuboid nanoantenna for simultaneously enhancing electric dipole(ED),magnetic dipole(MD)and electric quadrupole(EQ)*** study the scattering cross section,polarization charge distribution,and electromagnetic field distribution for electromagnetic plane wave illuminating the silicon dielectric cuboid nanoantenna,from which we have identified simultaneous existence of ED,MD and EQ resonance modes in this *** have calculated the Purcell factor of ED,MD and EQ emitters with different moment orientations as a function of radiation wavelength by placing these point radiation source within the nanoantenna,*** find that the resonances wavelengths of the Purcell factor spectrum are matching with the resonance modes in the ***,the maximum Purcell factor of these ED,MD and EQ emitters is 18,150 and 118 respectively,occur-ring at the resonance wavelength of 475,750,and 562 nm,respectively,all within the visible *** polarization charge distribution features allow us to clarify the excitation and radiation of these resonance modes as the physical ori-gin of large Purcell factor simultaneously occurring in this silicon cuboid *** theoretical results might help to deeply explore and design the dielectric nanoantenna as an ideal candidate to enhance ED,MD and EQ emission simultaneously with very small loss in the visible range,which is superior than the more popular scheme of plasmonic nanoantenna.

关键词： dielectric nanostructure spontaneous emission resonance Purcell effect

Beam dynamics,RF measurement,and commissioning of a CW heavy ion IH-DTL

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Nuclear Science and Techniques 2018年第3期29卷 143-155页

作者： Heng Du You-Jin Yuan Zhong-Shan Li Zhi-Jun Wang Peng Jin Xiao-Ni Li Guo-Zhu Cai Wen-Wen Ge Guo-Feng Qu Yuan He Jia-Wen Xia Jian-Cheng Yang Xue-Jun Yin Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A 53.667 MHz CW(continuous-wave) heavy ion IH-DTL has been designed for the SSC-LINAC injector of HIRFL-CSR(Heavy Ions research Facility at Lanzhou-Cooling Storage Ring). It accelerates ions with maximum mass-to-charge ratio of 7.0 from 143 to 295 ke V/u. Low-power RF measurement of the IH-DTL1 has been taken to investigate the RF performance and the quality of the electric field distribution on the beam *** measured Q_0 value and the shunt impedance are 10,400 and 198 MX/m, respectively. The electric field distributions on and around the beam axis were evaluated and compared with the design value. By a new approach,the dipole field component is also estimated. The beam dynamics simulation using measured field distribution was presented in this paper. Based on the dynamics analysis in both transverse and longitudinal phase space, the field distribution can meet the design requirement. Finally, the RF conditioning and very first beam commissioning on the IH-DTL1 were finished. The beam test results agree well with the simulation results; what's more, the property of the variable output beam energy about the separated functions DTL was verified.

关键词： Linac RF measurement Beam dynamic simulation Commissioning

Remediation of soil and groundwater contaminated with organic chemicals using stabilized nanoparticles: Lessons from the past two decades

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Frontiers of Environmental Science & Engineering 2020年第5期14卷 83-102页

作者： Zhengqing Cai Xiao Zhao Jun Duan Dongye Zhao Zhi Dang Zhang Lin National Engineering Lab for High-concentration Refractory Organic Wastewater East China University of Science and TechnologyShanghai 200237China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China College of Water Resources&Civil Engineering China Agricultural UniversityBeijing 100083China Environmental Engineering program Department of Civil EngineeringAuburn UniversityAuburnAL 36849USA School of Environment and Energy South China University of TechnologyGuangzhou 510006China

Due to improved soil deliverability and high reactivity,stabilized nanoparticles have been studied for nearly two decades for in situ remediation of soil and groundwater contaminated with organic *** large amounts of bench-and field-scale experimental data have demonstrated the potential of the innovative technology,extensive research results have also unveiled various merits and constraints associated different soil characteristics,types of nanoparticles and particle stabilization ***,this work aims to critically overview the fundamental principles on particle stabilization,and the evolution and some recent developments of stabilized nanoparticles for degradation of organic contaminants in soil and *** specific objectives are to:1)overview fundamental mechanisms in nanoparticle stabilization;2)summarize key applications of stabilized nanoparticles for in situ remediation of soil and groundwater contaminated by legacy and emerging organic chemicals;3)update the latest knowledge on the transport and fate of stabilized nanoparticles;4)examine the merits and constraints of stabilized nanoparticles in environmental remediation applications;and 5)identify the knowledge gaps and furore research needs pertaining to stabilized nanoparticles for remediation of contaminated soil and *** instructions of this invited special issue,this review is focused on contributions from our group(one of the pioneers in the subject field),which,however,is supplemented by important relevant works by *** knowledge gained is expected to further advance the science and technology in the environmental applications of stabilized nanoparticles.

关键词： Stabilized nanoparticle In-situ remediation Organic contaminant Soil remediation Groundwater Fate and transport

Significant reduction in friction and wear of a high-entropy alloy via the formation of self-organized nanolayered structure

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Journal of Materials Science & Technology 2021年第14期73卷 1-8页

作者： Lu Yang Zhuo Cheng Weiwei Zhu Cancan Zhao Fuzeng Ren Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Institute of Applied Physics and Materials Engineering Faculty of Science&TechnologyUniversity of MacaoMacaoChina

Sliding wear-induced nanolayering and its positive impact on wear resistance have been observed in conventional binary alloys with a matrix of high stacking fault energy(SFE),but this concept has never been reported in high-entropy alloys(HEAs)with low ***,we design and fabricate a(CoCrFeNi)_(90)Ag_(10)HEA,consisting of a face-center-cubic(fcc)CoCrFeNi HEA matrix with low SFE and uniformly dispersed Ag *** comparison with CoCrFeNi,a significant reduction in friction and wear was found in(CoCrFeNi)_(90)Ag_(10)HEA through the spontaneous formation of nanolayered subsurface microstructure during *** finding suggests a novel approach for designing HEAs that can achieve low friction and wear.

关键词： High-entropy alloy Sliding wear Nanolayering

Non-invasive delivery of levodopa-loaded nanoparticles to the brain via lymphatic vasculature to enhance treatment of Parkinson’s disease

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Nano research 2021年第8期14卷 2749-2761页

作者： Tianqi Nie Zhiyu He Jinchang Zhu Kuntao Chen Gregory P.Howard Jesus Pacheco-Torres II Minn Pengfei Zhao Zaver M.Bhujwalla Hai-Quan Mao Lixin Liu Yongming Chen School of Materials Science and Engineering Key Laboratory for Polymeric Composite and Functional Materials of Ministry of EducationSun Yat-sen UniversityGuangzhou 510275China Key Laboratory of Marine Chemistry Theory and Technology Ministry of EducationOcean University of ChinaQingdao 266100China Department of Materials Science and Engineering Johns Hopkins University BaltimoreMD 21218USA Department of Biomedical Engineering Johns Hopkins School of Medicine BaltimoreMD 21205USA Institute for NanoBioTechnology Johns Hopkins UniversityBaltimoreMD 21218USA Division of Nuclear Medicine and Molecular Imaging Department of Radiology and Radiological Science Johns Hopkins School of MedicineBaltimoreMD 21205USA Translational Tissue Engineering Center Johns Hopkins School of MedicineBaltimoreMD 21287USA

Levodopa(L-DOPA),a precursor of dopamine,is commonly prescribed for the treatment of the Parkinson’s disease(PD).However,oral administration of levodopa results in a high level of homocysteine in the peripheral circulation,thereby elevating the risk of cardiovascular disease,and limiting its clinical ***,we report a non-invasive method to deliver levodopa to the brain by delivering L-DOPA-loaded sub-50 nm nanoparticles via brain-lymphatic *** hydrophilic L-DOPA was successfully encapsulated into nanoparticles of tannic acid(TA)/polyvinyl alcohol(PVA)via hydrogen bonding using the flash nanocomplexation(FNC)process,resulting in a high L-DOPA-loading capacity and uniform size in a scalable *** analysis in a PD rat model demonstrated that the levels of dopamine and tyrosine hydroxylase,which indicate the dopaminergic neuron functions,were increased by 2-and 4-fold,*** disorders and cerebral oxidative stress of the rats were significantly *** formulation exhibited a high degree of biocompatibility as evidenced by lack of induced inflammation or other pathological changes in major *** antioxidative and drug-delivery platform administered through the brain-lymphatic vasculature shows promise for clinical treatment of the PD.

关键词： levodopa brain delivery cerebral lymphatic vasculature Parkinson’s disease

Fast-bunching design of compact heavy ion RFQ linac

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Nuclear Science and Techniques 2018年第12期29卷 81-88页

作者： Ke-Dong Wang You-Jin Yuan Xue-Jun Yin Jian-Cheng Yang Heng Du Zhong-Shan Li Xiao-Ni Li He Zhao Zi-Qiang Dong Jie Liu Jia-Wen Xia Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000 China University of Chinese Academy of Sciences Beijing 100049China Huizhou research Center of Ion Science Huizhou 516003China

We propose the construction of a compact linac as the injector of a cancer therapy facility at the Institute of Modern Physics(IMP) of the Chinese Academy of Sciences(CAS). Based on a traditional setup, a new compact fast-bunching design is first introduced to optimize the 600 keV/u RFQ with a 0.05 pm A ^(12)C^(4+) beam. This shortens the RFQ structure length from the standard design value of272–230 cm while effectively regulating the particle loss and emittance growth. In addition, a detailed error analysis was performed after the optimization process. The error sources cover input beam parameters errors, machining errors and alignment errors. The simulation results show that the beam loss and emittance growth of the RFQ are acceptable and within typical ranges of error.

关键词：线性加速器设计价值 RFQ 重离子单位面积优化过程中国科学院现代物理