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Graphene-tuned threshold gain to achieve optical pulling force on microparticle

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Chinese Physics B 2021年第6期30卷 306-310页

作者： hong-li chen Yang Huang School of Science Nantong UniversityNantong 226019China School of Science Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and TechnologyJiangnan UniversityWuxi 214122China

We investigate optical force on a graphene-coated gain microparticle by adopting the Maxwell's stress tensor *** is found that there exists a threshold gain in obtaining the Fano-profile optical force which indicates the reversal of optical pushing and pulling force. And giant pushing/pulling force can be achieved if the gain value of the material is in the proximity of the threshold gain. Our results show that the threshold gain is more sensitive to the relaxation time than to the Fermi energy of the graphene. We further study the optical force on larger microparticle to demonstrate the pulling force occurring at octupole resonance with small gain value and then it will appear at quadrupole resonance by increasing gain value. Our work provides an in-depth insight into the interaction between light and gain material and gives the additional degree of freedom to optical manipulation of microparticle.

关键词： pulling force threshold gain graphene microparticle

Engine performance analysis and optimization of a dual-mode scramjet with varied inlet conditions

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Acta Mechanica Sinica 2016年第1期32卷 75-82页

作者： Lu Tian li-hong chen Qiang chen Feng-Quan Zhong Xin-Yu Chang State Key Laboratory of High-Temperature Gas DynamicsInstitute of Mechanics Chinese Academy of SciencesBeijing 100190China

A dual-mode scramjet can operate in a wide range of flight conditions. Higher thrust can be generated by adopting suitable combustion modes. Based on the net thrust, an analysis and preliminary optimal design of a kerosene-fueled parameterized dual-mode scramjet at a cru- cial flight Mach number of 6 were investigated by using a modified quasi-one-dimensional method and simulated annealing strategy. Engine structure and heat release distrib- utions, affecting the engine thrust, were chosen as analytical parameters for varied inlet conditions （isolator entrance Mach number： 1.5-3.5）. Results show that different opti- mal heat release distributions and structural conditions can be obtained at five different inlet conditions. The highest net thrust of the parameterized dual-mode engine can be achieved by a subsonic combustion mode at an isolator entrance Mach number of 2.5. Additionally, the effects of heat release and scramjet structure on net thrust have been discussed. The present results and the developed analytical method can provide guidance for the design and optimization of high-performance dual-mode scramjets.

关键词： Dual-mode scramjet Engine performance Thrust Optimization Heat release distribution Simulatedannealing algorithm

Development of a subchannel code for blockage accidents of LMFRs based on the 3D fuel rod model

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Nuclear Science and Techniques 2022年第3期33卷 30-44页

作者： Xiao Luo lian-Kai Cao Wen-Pei Feng hong-li chen School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China

To predict the thermal-hydraulic(T/H)parameters of the reactor core for liquid-metal-cooled fast reactors(LMFRs),especially under flow blockage accidents,we developed a subchannel code called *** code uses a time-dependent,four-equation,singlephase flow model together with a 3D heat conduction model for the fuel rods,which is solved by numerical methods based on the finite difference method with a staggered *** to the local effect of the blockage on the flow field,low axial flow,increased forced crossflow,and backflow *** more accurately simulate this problem,we implemented a robust and novel solution *** verified the code with a low-flow(~0.01 m/s)and large-scale blockage *** the preliminary validation,we compared our results with the experimental data of the NACIE-UP BFPS blockage test and the KIT19ROD blockage *** results revealed that KMC-FB has sufficient solution accuracy and can be used in future flow blockage analyses for LMFRs.

关键词： Subchannel method Code development Blockage accident liquid-metal-cooled fast reactor

Startup scheme optimization and flow instability of natural circulation lead-cooled fast reactor SNCLFR-100

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Nuclear Science and Techniques 2021年第11期32卷 191-200页

作者： Wen-Shun Duan Ze-Ren Zou Xiao Luo hong-li chen School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China

Owing to the inherent instability of the natural circulation system,flow instability can easily occur during the operation of a natural circulation lead-cooled fast reactor,especially during the startup phase.A comprehensive startup scheme for SNCLFR-100,including primary and secondary circuits,is proposed in this *** references existing more mature startup schemes in various reactor *** additionally considers the restriction conditions on the power increase in other schemes and the characteristics of lead-based *** this basis,the multi-scale coupling code ATHLET-OpenFOAM was used to study the flow instability in the startup phase under different power-step amplitudes and power duration *** results showed that obvious flow instability phenomena were found in the different startup schemes,such as the short-term backflow phenomenon of the core at the initial time of the ***,an obvious increase in the flow rate and temperature to the peak value at the later stage of a continuous power rise was observed,as well as continuous oscillations before reaching a steady *** was determined that the scheme with smaller power-step amplitude and a longer power duration time requires more time to start the ***,it will be more conducive to the safe and stable startup of the reactor.

关键词： Natural circulation Lead-cooled fast reactor Startup scheme Flow instability Multi-scale coupling

Development and validation of a new oxide fuel rod performance analysis code for the liquid metal fast reactor

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Nuclear Science and Techniques 2022年第5期33卷 167-177页

作者： Guang-liang Yang Hai-Long liao Tao Ding hong-li chen School of Nuclear Science and Technology University of Science and Technology of ChinaHefei230026China

The integrity and reliability of fuel rods under both normal and accidental operating conditions are of great importance for nuclear *** this study,considering various irradiation behaviors,a fuel rod performance analysis code,named KMC-Fueltra,was developed to evaluate the thermal–mechanical performance of oxide fuel rods under both normal and transient conditions in the *** accuracy and reliability of the KMC-Fueltra were validated by analytical solutions,as well as the results obtained from codes and *** results indicated that KMC-Fueltra can predict the performance of oxide fuel rods under both normal and transient conditions in the LMFR.

关键词： Fuel rod analysis code Thermal-mechanical performance Irradiation behaviors Pellet-cladding mechanical interaction liquid metal fast reactor

Accessibility in key areas of the Arctic in the 21st mid-century

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Advances in Climate Change Research 2023年第6期14卷 896-903页

作者： Jin-Lei chen Shi-Chang KANG A-Dan WU li-hong chen Yi-Wen li State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Remote Sensing of Gansu Province Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Ocean Sciences China University of GeosciencesBeijing 100083China

The navigation potential of the Arctic has improved with the rapid retreat of sea ice under continuous *** comprehensive evaluation of Arctic accessibility for low ice-breaking ships(civil use)in the mid-century is important to support coordinated international *** this study,the hydrological conditions and navigation potential in key areas and crucial straits along the Northern Sea Route(NSR)and Northwest Passage(NWP)were assessed under Shared Socioeconomic Pathways(SSPs)using the Polar Operational limit Assessment Risk Indexing *** results showed that the most critical areas for navigation in the mid-century(2046-2055)are the waters around the New Siberian Islands and within the Parry *** navigability improves from SSP1-2.6 to SSP2-4.5 to SSP5-8.5,and the accessibility for PC7 ships under SSP2-4.5 is even better for OW ships under *** route on the north side of the New Siberian Islands is a relatively good choice within the NSR,and the southern route has a better navigation potential than the Parry Channel within the *** addition,the accessibility of the Dmitri Laptev Strait is better than that of the Sannikov Strait at a monthly scale,although the latter has more navigable ***,there is little difference in accessibility between the eastern and western parts of the Parry *** best nav-igation potential through the above straits is in September for ordinary ships,and the optimal time window is delayed and extended for PC7 *** results can serve as references for policy-making and navigation planning in the Arctic.

关键词： Arctic Sea ice Northeast passage Northwest passage CMIP6

Energy dissipation and contour integral characterizing fracture behavior of incremental plasticity

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Acta Mechanica Sinica 2011年第2期27卷 251-258页

作者： Qi-lin He lin-Zhi Wu Ming li hong-Bo chen chen Center for Composite Materials Harbin Institute of Technology 150080 Harbin China

J ep -integral is derived for characterizing the frac- ture behavior of elastic-plastic materials. The J ep -integral differs from Rice’s J-integral in that the free energy density rather than the stress working density is employed to define energy-momentum tensor. The J ep -integral is proved to be path-dependent regardless of incremental plasticity and deformation plasticity. The J epintegral possesses clearly clear physical meaning：（1） the value J ep tip evaluated on the infinitely small contour surrounding the crack tip represents the crack tip energy dissipation; （2） when the global steadystate crack growth condition is approached, the value of J ep farss calculated along the boundary contour equals to the sum of crack tip dissipation and bulk dissipation of plastic zone. The theoretical results are verified by simulating mode I crack problems.

关键词： J-integral · Energy dissipation · Proportional loading · Deformation plasticity · Incremental plasticity

Switch-on fluorescence sensor for ascorbic acid detection based on MoS2 quantum dots-MnO2 nanosheets system and its application in fruit samples

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Chinese Chemical Letters 2017年第2期28卷 338-344页

作者： Ya-li Xu Xiao-Ying Niu hong-li chen Sheng-Guo Zhao Xing-Guo chen State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringKey Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceLanzhou UniversityLanzhou 730000China Gansu Entry-Exit Inspection and Quarantine Bureau Lanzhou 730020China

In this work,molybdenum disulfide quantum dots（MoS2 QDs） were firstly prepared by hydrothermal method using sodium molybdate and glutathione as precursors,and applied in ascorbic acid *** joining MnO2 nanosheets into MoS2 QDs solution,they produced an obvious fluorescence quenching,which should be due to inner filter effect（IFE）.Meanwhile,the fluorescent probe was formed,Interestingly,we found that this quenching phenomenon disappeared with the addition of ascorbic acid,In other words,the fluorescence gradually *** recovery phenomenon is mainly due to the reduction effect of ascorbic acid for MnO2 *** the optimum conditions,the limit of detection（LOD） of 39 nmol/L for ascorbic acid was achieved with a linear range of 0.33-5.00 μmol/*** repeatability was better than 5.0% for ascorbic acid in both standard and fruit samples（n = 3）.Moreover,the as-fabricated fluorescent sensing system was successfully employed to detect the ascorbic acid levels in hawthorn and jujube with satisfactory results.

关键词： MoS2 QDs MnO2 nanosheets Ascorbic acid "Switch-on" fluorescence sensor Fruit samples

Biosensor Based on TTF@SiO_2 Nanoparticles as Electron Transfer Mediator for the Determination of Glucose

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Chemical Research in Chinese Universities 2006年第4期22卷 474-478页

作者： li Xiao-hua XIAN Yue-zhong MIN hong li chen-xin XIE Zong-hong ZHANG Fen-fen JIN li-tong Department of Chemistry East China Normal University Shanghai 200062 P. R. China

Tetrathiafulvalene（TTF） was doped in an SiO2 network and the resulting nanocompesite was used as a mediator for the selective detection of glucose. The uniform TTF-doped silica（TIT@SiO2 ） nanoparticles were prepared by the water-in-oil（W/O） microemulsion method, and were characterized by transmission electron microscopy（TEM）. The core-shell structure TTF@ SiO2 could prevent TIT from leaching out into an aqueous solution. Combined with chitosan （CHIT）, which serves as a scaffold for glucose oxidase and nanocomposite immobilization, the GCE/TTF@ SiO2- CHIT-GOx biosensor was developed. Under optimal conditions, the biosensors exhibit a linear range of 1.0 × 10^-5 5 × 10^-3 mol/L with a detection limit down to 5.0 μmol/L（S/N = 3 ）. The excellent selectivity, sensitivity, and stability of the glucose biosensor show its potential for practical applications.

关键词： TTF@ SiO2 nanoparticle Chitosan Glucose Biosensor