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Fractal microstructure of Ag film via plasma discharge as SERS substrates

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Chinese Physics B 2021年第12期30卷 479-483页

作者： xue-Fen Kan Cheng Yin Zhuang-Qi cao Wei Su Ming-lei Shan Xian-Ping Wang Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022China Department of Physics and Astronomy Shanghai JiaoTong UniversityShangha 200240China Department of Physics Key Laboratory of Optoelectronic and Telecommunication of Jiangxi ProvinceJiangxi Normal UniversityNanchang 330022China

According to the atmospheric pressure plasma(APP)technology,we propose a rapid synthetic approach of the substrates for enhanced Raman *** plasma is used to modify and etch the surface of silver film,which generates large scale hotspots'*** switching the discharge polarity and adjusting the film thickness,different surface morphologies are formed due to the oxidation,reactive etch and accumulation of the plasma product in a certain *** under positive corona discharge condition,dense snake-like microstructures are formed by the gradual connection of individual nanoparticles,which are driven by the influence of the electric field on surface *** addition,the experiments verify that the corresponding enhancement factor(EF)raises at least five orders of magnitude and the treatment time is about 10 min.

关键词： plasma discharge fractal microstructure surface-enhanced Raman scattering

Future Strategies on Glioma Research:From Big Data to the Clinic

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Genomics, Proteomics & Bioinformatics 2017年第4期15卷 263-265页

作者： Hang cao Feiyifan Wang xue-Jun Li Department of Neurosurgery Xiangya HospitalCentral South UniversityChangsha 410008China

Glioma, as the most common and aggressive malignant central nervous system （CNS） tumor with generally poor prognosis, has been attracting much attention in the last decade [1]. Temozolomide was firstly available in the United States in 1999 as a chemotherapy drug for treating brain cancers and remains as the first-line treatment for glioma. The World Health Organization （WHO） classified glioma into four main grades according to the degree of malignancy in 2007, which were updated in 2016 with the introduction of significant molecular alternations. Also in 2016, the Chinese Glioma Cooperative Group （CGCG） published the first guideline for adult diffuse gliomas [2], representing the only national consensus for the diagnosis and treatment of adult gliomas up till nOW.

关键词： From Big Data to the Clinic Future Strategies on Glioma Research GBM IDH

Defect-rich potassium amide: A new solid-state potassium ion electrolyte

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Journal of Energy Chemistry 2022年第6期31卷 555-560,I0015页

作者： Jiang Wang Gangtie lei Teng He Hujun cao Ping Chen Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023LiaoningChina Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education School of ChemistryXiangtan UniversityXiangtan 411105HunanChina

One of the major obstacles to the application of potassium-ion batteries in large-scale energy storage is the lack of safe and effective ***_(2),a new potassium-ion solid electrolyte has been developed in this *** ionic conductivity reaches 4.84×10^(-5)S cm^(-1)at 150°C and can reach3.56×10^(-4)S cm^(-1)after mechanochemical *** result from electron paramagnetic resonance(EPR) measurement shows that the increment of ionic conductivity is dependent on the concentration of nitrogen defects in the KNH_(2) *** the best of our knowledge,this is the first report that adopts inorganic amide as an electrolyte for potassium-ion battery and initiates the search for a new amidebased solid electrolyte for an all-solid-state potassium-ion battery.

关键词： Solid-state conductor Potassium ionic conductivity Nitrogen defect Potassium amide

Ultrasound sensing with optical microcavities

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Light(Science & Applications) 2024年第8期13卷 1487-1511页

作者： xuening cao Hao Yang Zu-lei Wu Bei-Bei Li Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Songshan Lake Materials Laboratory Dongguan 523808 GuangdongChina

Ultrasound sensors play an important role in biomedical imaging,industrial nondestructive inspection,*** ultrasound sensors that use piezoelectric transducers face limitations in sensitivity and spatial resolution when miniaturized,with typical sizes at the millimeter to centimeter *** overcome these challenges,optical ultrasound sensors have emerged as a promising alternative,offering both high sensitivity and spatial *** particular,ultrasound sensors utilizing high-quality factor(Q)optical microcavities have achieved unprecedented performance in terms of sensitivity and bandwidth,while also enabling mass production on silicon *** this review,we focus on recent advances in ultrasound sensing applications using three types of optical microcavities:Fabry-Perot cavities,π-phase-shifted Bragg gratings,and whispering gallery mode *** provide an overview of the ultrasound sensing mechanisms employed by these microcavities and discuss the key parameters for optimizing ultrasound ***,we survey recent advances in ultrasound sensing using these microcavity-based approaches,highlighting their applications in diverse detection scenarios,such as photoacoustic imaging,ranging,and particle *** goal of this review is to provide a comprehensive understanding of the latest advances in ultrasound sensing with optical microcavities and their potential for future development in high-performance ultrasound imaging and sensing technologies.

关键词： optical millimeter offering

Post-Impact Motion Planning and Tracking Control for Autonomous Vehicles

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 315-332页

作者： Cong Wang Zhenpo Wang lei Zhang Huilong Yu Dongpu cao National Engineering Research Center for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China School of Vehicle and Mobility Tsinghua UniversityBeijing 100080China

There is an increasing awareness of the need to reduce traffic accidents and fatality due to vehicle ***-impact hazards can be more serious as the driver may fail to maintain effective control after *** avoid subsequent crash events and to stabilize the vehicle,this paper proposes a post-impact motion planning and stability control method for autonomous *** enabling motion planning method is proposed for post-impact situations by combining the polynomial curve and artificial potential field while considering obstacle avoidance.A hierarchical controller that consists of an upper and a lower controller is then developed to track the planned *** the upper controller,a time-varying linear quadratic regulator is presented to calculate the desired generalized *** the lower controller,a nonlinear-optimization-based torque allocation algorithm is proposed to optimally coordinate the actuators to realize the desired generalized *** proposed scheme is verified under comprehensive driving scenarios through hardware-in-loop tests.

关键词： Active safety Post-impact control Motion planning Vehicle dynamics control

Rational design of hollow oxygen deficiency-enriched NiFe_(2)O_(4)@N/rGO as bifunctional electrocatalysts for overall water splitting

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Journal of Energy Chemistry 2021年第3期30卷 595-603页

作者： lei cao Zhenhuan Li Kunmei Su Maliang Zhang Bowen Cheng State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes School of Materials Science and EngineeringTiangong UniversityTianjin 300387China School of Environment Science and Chemistry Engineering Tiangong UniversityTianjin 300160China

Bimetallic metal organic framework(MOF)as a precursor to prepare catalysts with bifunctional catalytic activity of oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)attracts more and more ***,hollow oxygen deficiency-enriched NiFe_(2)O_(4) is synthesized by pyrolytic FeNi bimetallic *** defects of rGO during carbonization can act as nucleation sites for FeNi *** nucleation and N doping,the FeNi particles were served as catalysts for the deposition of dissolved carbon in the defects of the N/*** deposited carbon,like a bridge,connect N/rGO and hollow oxygen deficiency-enriched NiFe_(2)O_(4) together,which giving full play to the advantages of N/rGO in fast electron transfer,thereby improving its catalytic *** resultant NiFe_(2)O_(4)@N/rGO-800 exhibits a low overpotential of 252 mV at 20 mA cm^(-2) for OER and 157 mV at 10 mA cm^(-2) for HER in 1 M KOH,*** used as bifunctional electrodes for overall water splitting,it also shows low cell voltage of 1.60 V and 1.67 V at 10 and 20 mA cm^(-2),respectively.

关键词： Oxygen deficiency Hollow NiFe_(2)O_(4) N/rGO Bifunctional electrocatalyst Overall water splitting

Global Optimization Method for Linear Multiplicative Programming

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Acta Mathematicae Applicatae Sinica 2015年第2期31卷 325-334页

作者： xue-gang ZHOU Bing-yuan cao Kun WU School of Mathematics and Information Science Key Laboratory of Mathematics and Interdisciplinary Sciences of Guangdong Higher Education Institutes Guangzhou University Department of Applied Mathematics Guangdong University of Finance School of Mathematical Science and Computing Technology Center South University

In this paper, a new global algorithm is presented to globally solve the linear multiplicative programming（LMP）. The problem（LMP） is firstly converted into an equivalent programming problem（LMP（H））by introducing p auxiliary variables. Then by exploiting structure of（LMP（H））, a linear relaxation programming（LP（H）） of（LMP（H）） is obtained with a problem（LMP） reduced to a sequence of linear programming problems. The algorithm is used to compute the lower bounds called the branch and bound search by solving linear relaxation programming problems（LP（H））. The proposed algorithm is proven that it is convergent to the global minimum through the solutions of a series of linear programming problems. Some examples are given to illustrate the feasibility of the proposed algorithm.

关键词： linear multiplicative programming global optimization linear programming branch and bound

Study on severe accident mitigation measures for the development of PWR SAMG

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Nuclear Science and Techniques 2006年第4期17卷 245-251页

作者： ZHANG Kun cao xue-Wu CHE Ji-Yao Department of Nuclear Science and System Engineering Shanghai Jiaotong University Shanghai 200240 China

In the development of the Severe Accident Management Guidelines (SAMG), it is very important to choose the main severe accident sequences and verify their mitigation measures. In this article, Loss-of-Coolant Ac- cident (LOCA), Steam Generator Tube Rupture (SGTR), Station Blackout (SBO), and Anticipated Transients without Scram (ATWS) in PWR with 300 MWe are selected as the main severe accident sequences. The core damage pro- gressions induced by the above-mentioned sequences are analyzed using SCDAP/RELAP5. To arrest the core damage progression and mitigate the consequences of severe accidents, the measures for the severe accident management (SAM) such as feed and bleed, and depressurizations are verified using the calculation. The results suggest that im- plementing feed and bleed and depressurization could be an effective way to arrest the severe accident sequences in PWR.

关键词：压水反应堆重大事故管理指南补救措施核安全

Accumulation of localized charge on the surface of polymeric carbon nitride boosts the photocatalytic activity

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Journal of Materials Science & Technology 2022年第16期111卷 9-16页

作者： Yabin Jiang lei Zeng Chi cao Wensheng Yang Limin Huang School of Materials Sun Yat-Sen UniversityShenzhen 518107China Department of Chemistry Southern University of Science and TechnologyShenzhenGuangdong 518055China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China Institute of Molecular Plus Tianjin UniversityTianjin 300072China

The random mobility of charge carriers is a main factor causing the low photocatalytic efficiency of ***,the controllable migration of charge carriers is a rational strategy to suppress the charge recombination and facilitate charge ***,an ethylenediamine modified g-C_(3)N_(4)displays improved photocatalytic *** excellent charge separation efficiency is confirmed to be a key factor for the *** TEM observation after photo-depositing Pt nanoparticles and DFT calculations verify the accumulation of electrons on some areas of g-C_(3)N_(4)*** increased-NH_(2)groups significantly tune the electronic structure of g-C_(3)N_(4)after the *** generation of midgap states also affects the charge *** reports provide a simple method to manage the migration of charge carriers and enable electrons directional transfer,which suppresses the recombination and improves the photocatalytic activity.

关键词： g-C_(3)N_(4) Charge separation Photocatalytic H2 evolution Directional migration