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| 1 | Challenges and developments of automotive fuel cell hybrid power system and control显示文摘Fuel cells are emerging as promising power sources and have attracted increasing attention from industries and academics worldwide. In particular, automotive manufacturers are replacing internal combustion engines in vehicles with fuel cell systems, which are advantaged by zero emissions, high efficiency,and various clean routes that generate pure hydrogen. However, current fuel cell systems are costly, and their corresponding infrastructures are not fully qualified to meet current market demand. This paper reviews the challenges and developments of automotive fuel cell hybrid power systems and their controls. It briefly summarizes the model, control, and optimization issue associated with the research and application of fuel cells in hybrid power systems. After presenting the basic knowledge and discussing the trending size and structure of fuel cells for automotive usage, the review describes models of automotive fuel cell systems,focusing on the electrochemical reaction dynamics and the key parameters influencing their efficiency and lifetime. The control problems associated with automotive fuel cell systems as well as the optimization issue associated with hybrid energy systems(comprising fuel cells, batteries, and ultra-capacitors) are elaborately analyzed. The review concludes with current problems and challenges faced by the energy control systems of fuel cell vehicles. | Jinwu GAO Meng LI Yunfeng HU Hong CHEN Yan MA | 2019 | Science China(Information Sciences)2019，62，5： | 6 |
| 2 | Vision algorithms for fixed-wing unmanned aerial vehicle landing system显示文摘Autonomous landing has become a core technology of unmanned aerial vehicle(UAV)guidance,navigation and control | FAN YanMing DING Meng CAO YunFeng | 2017 | Science China(Technological Sciences)2017，60，3： | 6 |
| 3 | Novel approach of crater detection by crater candidate region selection and matrix-pattern-oriented least squares support vector machine显示文摘Impacted craters are commonly found on the surface of planets, satellites, asteroids and other solar system bodies. In order to speed up the rate of constructing the database of craters, it is important to develop crater detection algorithms. This paper presents a novel approach to automatically detect craters on planetary surfaces. The approach contains two parts: crater candidate region selection and crater detection. In the first part, crater candidate region selection is achieved by Kanade-Lucas-Tomasi (KLT) detector. Matrix-pattern-oriented least squares support vector machine (MatLSSVM), as the matrixization version of least square support vector machine (SVM), inherits the advantages of least squares support vector machine (LSSVM), reduces storage space greatly and reserves spatial redundancies within each image matrix compared with general LSSVM. The second part of the approach employs MatLSSVM to design classifier for crater detection. Experimental results on the dataset which comprises 160 preprocessed image patches from Google Mars demonstrate that the accuracy rate of crater detection can be up to 88%. In addition, the outstanding feature of the approach introduced in this paper is that it takes resized crater candidate region as input pattern directly to finish crater detection. The results of the last experiment demonstrate that MatLSSVM-based classifier can detect crater regions effectively on the basis of KLT-based crater candidate region selection. | Ding Meng Cao Yunfeng Wu Qingxian | 2013 | Chinese Journal of Aeronautics2013，26，2： | 4 |
| 4 | An Edge-Boxes-Based Intruder Detection Algorithm for UAV Sense and Avoid System显示文摘With the great development of unmanned aircraft system(UAS)over the last decade,sense and avoid(SAA)system has been a crucial technology for integrating unmanned aircraft vehicle(UAV)into national airspace with reliable and safe operations.This paper mainly focuses on intruder detection for SAA system.A robust algorithm based on the combination of edge-boxes and spatial pyramid matching using sparse coding(sc-SPM)is presented.The algorithm is composed of three stages.First,edge-boxes method is adopted to obtain a large number of proposals;Second,the optimization program is presented to obtain intruder area-of-interest(ROI)regions;Third,sc-SPM is employed for feature representation of ROI regions and support vector machines(SVM)is adopted to detect the intruder.The algorithm is evaluated under different weather conditions.The recall reaches to 0.95 in dawn and sunny weather and 0.9 in cloudy weather.The experimental results indicate that the intruder detection algorithm is effective and robust with various weather under complex background. | ZHANG Zhouyu CAO Yunfeng ZHONG Peiyi DING Meng HU Yunqiang | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，2： | 3 |
| 5 | A NEW LOW-COST DEMODULATOR FOR 2.4 GHZ ZIGBEE RECEIVERS显示文摘A new low-cost demodulator for ZigBee receivers satisfying requirements of IEEE802.15.4 standard is presented,which is designed for ISM 2.4 GHz band and based on Zero-IF receivers.This demodulator extracts symbols directly from baseband signal rather than recovering PN code chips,so its structure is simple.Two main techniques are used to improve the performance of demodulator.One is Phase-Axis Crossing Detector(PACD) which detects the phase correlation of baseband signal.The other is symbol synchronization and sampling clock correction algorithm.The result shows that this demodulator performance,Symbol Error Rate(SER) and Packet Error Rate(PER) meet IEEE 802.15.4TM standard requirements and the demodulator can handle frequency offset in excess of 200 kHz,involving a Zero-IF receiver with a Noise Figure(NF) lower than 17 dB,which is easily imple-mented in standard CMOS technology. | Yu Yunfeng Meng Xin Xiao Shimao Ma Chengyan Ye Tianchun | 2009 | Journal of Electronics(China)2009，26，2： | 2 |
| 6 | Thermo-responsive stick-slip behavior of advancing water contact angle on the surfaces of poly(N-isopropylacrylamide)-grafted polypropylene membranes显示文摘Wettability of a solid surface is highly important to its practical application,especially for the surface that shows thermoresponsive properties.In this paper,we describe a thermo-responsive stick-slip behavior of water droplets on the surfaces of poly(N-isopropylacrylamide)(PNIPAM)-grafted polypropylene membranes.Field emission scanning electron microscope(FESEM) images elucidate that the morphology of PNIPAM-grafted membrane surface is thermo-responsive,i.e.,the surface becomes rougher above the lower critical solution temperature(LCST) of PNIPAM.On the surface of nascent polypropylene membranes,the water droplet shows a smooth motion resulting in advancing and receding water contact angles of 111° and ~65°,respectively.On the PNIPAM-grafted membrane surfaces,the water droplet shows a stick-slip pattern above the LCST,whereas it advances smoothly below the LCST.This phenomenon is reproducible and can be ascribed to the energy barriers enhanced by the shrink of PNIPAM chains above the LCST.We also find that the slip contact angle decreases from 102° to 92° after several stick-slip cycles.This decrease is attributed to the water adsorption on the grafted PNIPAM layer,which is confirmed by the continuous decrease of the receding water contact angle. | WAN LingShu,MENG XiangLin,YANG YunFeng,TIAN Jing & XU ZhiKang Key Laboratory of Macromolecular Synthesis and Functionalization,Ministry of Education Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China | 2010 | Science China Chemistry2010，53，1： | 2 |
| 7 | Microscopic and Fractal Characterization of Organic Matter within Lacustrine Shale Reservoirs in the First Member of Cretaceous Qingshankou Formation,Songliao Basin,Northeast China显示文摘Understanding the occurrences of different fractions of organic matter in shale reservoirs is very important for the evaluation of shale oil.Lacustrine organic-rich shale samples from the first member of the Cretaceous Qingshankou Formation in the Songliao Basin were analyzed with confocal laser scanning microscopy(CLSM)and fluorescence spectral analysis.The results show that the occurrences of different organic components are related to the fabric of samples and vary with depth.The bulk content of light components is significantly higher than heavy components and exhibits a positive relationship with quartz and feldspar contents.Both light and heavy components are distributed parallel with the lamination in microscopic view in laminated samples,and randomly in massive samples.The maximum radius of light components in most of the samples is larger than 20μm,while it is smaller for heavy components,indicating the micro fractionation from clay/organic lamina to quartz/feldspar lamina.The depth of enrichment of light components corresponds to the oil maturity of organic matter.Both the distribution of light and heavy components fits the same fractal model,with fractal dimensions ranging between 2.2 and 2.5.The CLSM results confirm that it can be a reliable tool for the'sweet spot'exploration. | Bo Liu Meng Yan Xianda Sun Yunfeng Bai Longhui Bai Xiaofei Fu | 2020 | Journal of Earth Science2020，31，6： | 2 |
| 8 | Method of Passive Image Based Crater Autonomous Detection 显示文摘 | Ding Meng Cao Yunfeng Wu Qingxian | 2009 | Chinese Jouma! of Aeronautics2009，22，3： | 1 |
| 9 | Sodium-based dual-ion batteries via coupling high-capacity selenium/graphene anode with high-voltage graphite cathode显示文摘Dual ion batteries(DIBs) exhibit broad application prospects in the field of electrical energy storage(EES)devices with excellent properties,such as high voltage,high energy density,and low cost.In the graphitebased DIBs,high voltage is needed to store enough anions with the formation of anion intercalation compound XCn(X=AlCl4-,PF6-,TFSI-,etc.).Hence,it is difficult for graphite-based DIBs to match proper anodes and electrolytes.Here,an Se/graphene composite is prepared via a convenient method,and assembled into a dual-ion full battery(DIFB) as anode with graphite cathode and 1 mol/L NaPF6 in EC:EMC(1:1,v:v).This DIFB has achieved a high discharge capacity of 75.9 mAh/g and high medium output voltage of 3.5 V at 0.1 A/g.Actually,the suitable anode materials,such as the present Se/graphene composite,are extremely important for the development and application of graphite-based DIBs.This study is enlightening for the design of future low-cost EES devices including graphite-based DIBs. | Xiankun Hou Wenhao Li Yingying Wang Shaofang Li Yunfeng Meng Haiyue Yu Baokuan Chen Xinglong Wu | 2020 | Chinese Chemical Letters2020，31，9： | 1 |
| 10 | CO2 emission in an intensively cultivated loam as affected by long-term application of organic manure and nitrogen fertilizer显示文摘 | Ding Weixin Meng Lei Yin Yunfeng | 2007 | Soil Biology and Biochemistry2007，39，2： | 1 |
| 11 | Porous YSZ ceramics by water-based gel casting 显示文摘 | GU Yunfeng LIU Xingqin MENG Guangyao | 1999 | Ceram Int1999，25，8： | 1 |
| 12 | Porous YSZ ce- ramics by water-based gelcasting显示文摘 | Gu Yunfeng Liu Xingqin Meng Guangyao | 1999 | Ceramics International1999，25，8： | 1 |
| 13 | Systemic delivery of microRNA for treatment of brain ischemia显示文摘Brain ischemia is the second leading cause of death and the third leading cause of disability in the world.Systemic delivery of microRNA,a class of molecules that regulate the expression of cellular proteins associated with angiogenesis,cell growth,proliferation and differentiation,holds great promise for the treatment of brain ischemia.However,their therapeutic efficacy has been hampered by poor delivery efficiency of microRNA.We report herein a platform technology based on microRNA nanocapsules,which enables their effective delivery to the disease sites in the brain.Exemplified by microRNA-21,intravenous injection of the nanocapsules into a rat model of cerebral ischemia could effectively ameliorate the infarct volume,neurological deficit and histopathological severity. | Chaoyong Liu Jing Wen Dai Li Hongzhao Qi Lina Nih Jialin Zhu Duo Xu Yu Ren Shanshan Zhang Donglin Han Huanhuan Jia Junhu Zhou Meng Qin Jialing Wu Xubo Yuan Ji Liu Jin Zhao Chunsheng Kang Yunfeng Lu | 2021 | Nano Research2021，14，9： | 0 |
| 14 | In situ confined vertical growth of Co_(2.5)Ni_(0.5)Si_(2)O_(5)(OH)_(4)nanoarrays on rGO for an efficient oxygen evolution reaction显示文摘Rational design of oxygen evolution reaction(OER)catalysts at low cost would greatly benefit the economy.Taking advantage of earth-abundant elements Si,Co and Ni,we produce a unique-structure where cobalt-nickel silicate hydroxide[Co_(2.5)Ni_(0.5)Si_(2)O_(5)(OH)_(4)]is vertically grown on a reduced graphene oxide(rGO)support(CNS@rGO).This is developed as a low-cost and prospective OER catalyst.Compared to cobalt or nickel silicate hydroxide@rGO(CS@rGO and NS@rGO,respectively)nanoarrays,the bimetal CNS@rGO nanoarray exhibits impressive OER performance with an overpotential of 307 mV@10 mA cm^(-2).This value is higher than that of CS@rGO and NS@rGO.The CNS@rGO nanoarray has an overpotential of 446 mV@100 mA cm^(-2),about 1.4 times that of the commercial RuO_(2)electrocatalyst.The achieved OER activity is superior to the state-of-the-art metal oxides/hydroxides and their derivatives.The vertically grown nanostructure and optimized metal-support electronic interactions play an indispensable role for OER performance improvement,including a fast electron transfer pathway,short proton/electron diffusion distance,more active metal centers,as well as optimized dualatomic electron density.Taking advantage of interlay chemical regulation and the in-situ growth method,the advanced-structural CNS@rGO nanoarrays provide a new horizon to the rational and flexible design of efficient and promising OER electrocatalysts. | Yang Mu Xiaoyu Pei Yunfeng Zhao Xueying Dong Zongkui Kou Miao Cui Changgong Meng Yifu Zhang | 2023 | Nano Materials Science2023，5，4： | 0 |
| 15 | A Chemical Kinetics Perspective on the High-Temperature Oxidation of Methane and Propane through Experiments and Kinetic Analysis显示文摘In the conversion of methane and propane under high temperature and pressure,the ignition delay time(IDT)is a key parameter to consider for designing an inherently safe process.In this study,the IDT characteristics of methane and propane(700–1000 K,10–20 bar)were studied experimentally and using kinetic modeling tools at stoichiometric fuel-tooxygen ratios.All the experiments were conducted through insentropic compression.The reliable experimental data were obtained by using the adiabatic core hypothesis,which can be used to generate and validate the detailed chemical kinetics model.The IDTs of methane and propane were recorded by a rapid compression machine(RCM)and compared to the predicted values obtained by the NUIGMech 3.0 mechanism.To test the applicability of NUIGMech 3.0 under different reaction conditions,the influence of temperature in the range of 700–1000 K(and the influence of pressure in the range of 10–20 bar)on the IDT was studied.The results showed that NUIGMech 3.0 could reasonably reproduce the experimentally determined IDT under the wide range of conditions studied.The constant volume chemical kinetics model was used to reveal the effect of temperature on the elementary reaction,and the negative temperature coefficient(NTC)behavior of propane was also observed at 20 bar.The experimental data can serve as a reference for the correction and application of kinetic data,as well as provide a theoretical basis for the safe conversion of low-carbon hydrocarbon chemicals. | Ma Shoutao Yang Zhe Zhu Yunfeng Sun Bing Jiang Jie Xu Wei Meng Ruiji | 2022 | China Petroleum Processing & Petrochemical Technology2022，24，4： | 0 |
| 16 | Highly efficient and aberration-free off-plane grating spectrometer and monochromator for EUV—soft X-ray applications显示文摘We demonstrate a novel flat-field,dual-optic imaging EUV—soft X-ray spectrometer and monochromator that attains an unprecedented throughput efficiency exceeding 60%by design,along with a superb spectral resolution ofλ/Δλ>200 accomplished without employing variable line spacing gratings.Exploiting the benefits of the conical diffraction geometry,the optical system is globally optimized in multidimensional parameter space to guarantee optimal imaging performance over a broad spectral range while maintaining circular and elliptical polarization states at the first,second,and third diffraction orders.Moreover,our analysis indicates minimal temporal dispersion,with pulse broadening confined within 80 fs tail-to-tail and an FWHM value of 29 fs,which enables ultrafast spectroscopic and pump-probe studies with femtosecond accuracy.Furthermore,the spectrometer can be effortlessly transformed into a monochromator spanning the EUV—soft X-ray spectral region using a single grating with an aberration-free spatial profile.Such capability allows coherent diffractive imaging applications to be conducted with highly monochromatic light in a broad spectral range and extended to the soft X-ray region with minimal photon loss,thus facilitating state-of-the-art imaging of intricate nano-and bio-systems,with a significantly enhanced spatiotemporal resolution,down to the nanometer–femtosecond level. | Jie Li Kui Li Xiaoshi Zhang Dimitar Popmintchev Hao Xu Yutong Wang Ruixuan Li Guangyin Zhang Jiyue Tang Jin Niu Yongjun Ma Runyu Meng Changjun Ke Jisi Qiu Yunfeng Ma Tenio Popmintchev Zhongwei Fan | 2024 | Light(Science & Applications)2024，13，1： | 0 |
| 17 | R3-MYB proteins OsTCL1 and OsTCL2 modulate seed germination via dual pathways in rice显示文摘Salt and drought stress are common abiotic factors that exert a detrimental influence on seed germination,potentially leading to significantly impaired growth and production in rice.Gaining a comprehensive understanding of the molecular response of seeds to abiotic stress during the germination is of paramount importance.In the present study,we identified two R3-MYB genes in rice,namely OsTCL1 and OsTCL2,and characterized their roles in regulating seed germination under salt and drought stress.Plants with tcl1 and tcl2 mutant alleles exhibited delayed seed germination,particularly under stress conditions.The tcl1 tcl2 double mutant showed an even more pronounced reduction in germination during initial stages of germination,thereby indicating a redundant regulatory function of OsTCL1 and OsTCL2 in seed germination under abiotic stresses.Furthermore,we demonstrated that the transcript levels of several phospholipase D(PLD)genes were downregulated in the tcl1 tcl2 mutant,resulting in a decreased level of the phosphatidic acid(PA)product.Application of 1-butanol,a competitive substrate inhibitor of PLD-dependent production of PA,attenuated the stress response of the tcl1 tcl2 mutant.This suggests that OsTCL1 and OsTCL2 partially modulate seed germination through the PLD-PA signaling pathway.Moreover,there were alterations in the expression of genes involved in abscisic acid(ABA)biosynthesis,metabolism and signaling transduction in the double mutant.These changes affected the endogenous ABA level and ABA response,thereby influencing seed germination.Application of both 1-butanol and ABA synthesis inhibitor sodium tungstate(Na2WO4)nearly eliminated the differences in stress response between wild type and the tcl1 tcl2 mutant.This indicates that OsTCL1 and OsTCL2 synergistically coordinate seed germination under abiotic stresses through both the PLD-PA signaling and ABA-mediated pathways. | Yong Yi Chan Lin Xueyan Peng Meishan Zhang Jiaming Wu Chunmei Meng Shengchao Ge Yunfeng Liu Yuan Su | 2023 | The Crop Journal2023，11，6： | 0 |
| 18 | Broadband SESAM for mode locked Yb:fiber lasers显示文摘We report a semiconductor saturable absorber mirror (SESAM) with phase shift compensation.The SESAM shows a uniform low-intensity reflectivity and a modulation depth up to 12% for the wavelength from 1000 to 1100 nm.A linear cavity all-normal dispersion Yb-doped fiber laser has proved its mode locking performance for the wavelength of both 1030 nm and 1064 nm. | CHEN LingLing ZHANG Meng WANG Xi LI WenChao WEI Yun MA YunFeng FAN ZhongWei NIU Gang YU Jin LIU Yang ZHANG Xue ZHANG ZhiGang | 2011 | Chinese Science Bulletin2011，56，13： | 0 |
| 19 | Fine mapping and transcriptome sequencing reveal candidate genes conferring all-stage resistance to stripe rust on chromosome arm 1AL in Chinese wheat landrace AS1676显示文摘Stripe rust, caused by Puccinia striiformis f. sp. tritici(Pst), threatens wheat production worldwide, and resistant varieties tend to become susceptible after a period of cultivation owing to the variation of pathogen races. In this study, a new resistance gene against Pst race CYR34 was identified and predicted using the descendants of a cross between AS1676, a highly resistant Chinese landrace, and Avocet S, a susceptible cultivar. From a heterozygous plant from a F7recombinant inbred line(RIL) population lacking the Yr18 gene, a near-isogenic line(NIL) population was developed to map the resistance gene. An allstage resistance gene, YrAS1676, was identified on chromosome arm 1AL via bulked-segregant exomecapture sequencing. By analyzing a large NIL population consisting of 6537 plants, the gene was further mapped to the marker interval between KA1A_485.36 and KA1A_490.13, spanning 485.36–490.13 Mb on1AL. A total of 66 annotated genes have been reported in this region. To characterize and predict the candidate gene(s), an RNA-seq was performed using NIL-R and NIL-S seedlings 3 days after CYR34 inoculation. Compared to NIL-S plants, NIL-R plants showed stronger immune reaction and higher expression levels of genes encoding pathogenesis-associated proteins. These differences may help to explain why NIL-R plants were more resistant to Pst race CYR34 than NIL-S plants. By combining fine-mapping and transcriptome sequencing, a calcium-dependent protein kinase gene was finally predicted as the potential candidate gene of YrAS1676. This gene contained a single-nucleotide polymorphism. The candidate gene was more highly expressed in NIL-R than in NIL-S plants. In field experiments with Pst challenge,the YrAS1676 genotype showed mitigation of disease damage and yield loss without adverse effects on tested agronomic traits. These results suggest that YrAS1676 has potential use in wheat stripe rust resistance breeding. | Xiu Yang Yunfeng Jiang Xianghai Yu Haipeng Zhang Yuqi Wang Fangnian Guan Li Long Hao Li Wei Li Qiantao Jiang Jirui Wang Yuming Wei Jian Ma Houyang Kang Pengfei Qi Qiang Xu Meng Deng Yazhou Zhang Youliang Zheng Yonghong Zhou Guoyue Chen | 2023 | The Crop Journal2023，11，5： | 0 |
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