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27篇 您的检索式:作者名="Xianfeng Yi"
    题名 作者 年代 出处 被引量
1Microstructure of premixed propane/air flame in the transition from laminar to turbulent combustion显示文摘In order to explore the flame structure and propagation behavior of premixed propane/air in the transi-tion from laminar to turbulent combustion, the high speed camera and Schlieren images methods were used to record the photograph of flame propagation process in a semi-vented pipe. Meanwhile, the super-thin thermocouple and ionization current probe methods were applied to detect the temperature distribution and reaction intensity of combustion reaction. The characteristics of propane/air flame propagation and microstructure were analyzed in detail by the experimental results coupled with chemical reaction thermodynamics. In the test, the particular tulip flame behavior and the formation process in the laminar-turbulent transition were disclosed clearly. From the Schlieren images and iron current results, one conclusion can be drawn that the small-scale turbulent combustion also appeared in laminar flame, which made little influence on the flame shape, but increased the flame thickness obviously.CHEN XianFeng SUN JinHua LIU Yi LIU XuanYa CHEN SiNing LU ShouXiang 2007Chinese Science Bulletin2007,52,5:9
2Flame propagation characteristics and flame structures of zirconium particle cloud in a small-scale chamber显示文摘Flame propagating through zirconium particle cloud in a small-scale vertical rectangle chamber was investigated experimentally.In the experiments,the zirconium quoted 99% purity was used and the diameter of particles was distributed 1-22 μm.The zirconium dust was dispersed into the chamber by air flow and ignited by an electrode spark.A high-speed video camera was used to record the images of the propagating flame.Micro-thermocouples,schlieren optical system and microscopic lens were used to obtain temperature profiles and flame structure,respectively.Based on the experimental results,flame propagation characteristics and flame structure of zirconium particle cloud were analyzed.The propagation velocity of the flame is quite slow in the initial 14 ms and then accelerates to maximum value.Subsequently,the propagation velocity of the flame almost keeps constant.The combustion zone width of zirconium particle cloud is 5-6 mm.Smaller particles burn mainly at the leading edge of combustion zone in the width of 1.4 mm followed by larger particles burning 1.4-6 mm behind the leading edge of the combustion zone.Gas phase flame is not seen in zirconium particle cloud and the combustion time of single zirconium particle is 1-5 ms,which depends on its original size.The preheated zone is 7-8 mm thickness ahead of the combustion zone and intensive chemical reaction takes place at 490 K.The maximum flame temperature increases at lower concentrations,reaches the maximum value,and then decreases slightly at higher concentrations.DING YiBin SUN JinHua HE XueChao WANG QiuHong YIN Yi XU Yao Chen XianFeng 2010Chinese Science Bulletin2010,55,34:8
3Progress and prospect for NASICON-type Na3V2(PO4)3 forelectrochemical energy storage显示文摘Sodium-ion batteries(SIBs) have attracted increasing attention in the past decades, because of high overall abundance of precursors, their even geographical distribution, and low cost. Na_3V_2(PO_4)_3(NVP), a typical sodium super ion conductor(NASICON)-based electrode material, exhibits pronounced structural stability, exceptionally high ion conductivity, rendering it a most promising electrode for sodium storage.However, the comparatively low electronic conductivity makes the theoretical capacity of NVP cannot be fully accessible even at comparatively low rates, presenting a major drawback for further practical applications, especially when high rate capability is especially important. Thus, many endeavors have been conformed to increase the surface and intrinsic electrical conductivity of NVP by coating the active materials with a conductive carbon layer, downsizing the NVP particles, combining the NVP particle with various carbon materials and ion doping strategy. In this review, to get a better understanding on the sodium storage in NVP, we firstly present 4 distinct crystal structures in the temperature range of -30°C^225°C namely α-NVP, β-NVP, β-NVP and γ-NVP. Moreover, we give an overview of recent approaches to enhance the surface electrical conductivity and intrinsic electrical conductivity of NVP. Finally, some potential applications of NVP such as in all-climate environment and PHEV, EV fields have been prospected.Qiong Zheng Hongming Yi Xianfeng Li Huamin Zhang 2018Journal of Energy Chemistry2018,27,6:7
4Estimating the Operation Status of Steam Cracking Furnace Using Numerical Simulation with Combustion Models显示文摘An accurate and complete geometric model was constructed to simulate the combustion, flow and temperature environment in the radiant section of the steam cracking furnace. Simulation of flow and radiation status has utilized the standard k-ε model and P1 model. The finite-rate/eddy-dissipation (finite-rate/ED) combustion model and non-premixed combustion model were both used to simulate accurately the combustion and the operation status of the steam cracking furnace. Three different surfaces of the steam cracking furnace were obtained from the simulation, namely:the flue gas temperature field of the entrance surface in long flame burners, the central surface location of tubes, and the crossover section surface. Detailed information on the flue gas temperature and the mass concentration fraction of these different surfaces in the steam cracking furnace can also be obtained by the simulation. This paper analyzed and compared the simulation results with the two combustion models, estimated the operation status of the steam cracking furnace, and reported that the finite-rate/ED model is appropriate to simulate the steam cracking furnace by comparing key simulation data with actual test data. This work has also provided a theoretical basis for simulating and operating the steam cracking furnace.Zhou Xianfeng Yang Yuanyi Wang Guoqing Zhang Lijun Liu Yi 2012China Petroleum Processing & Petrochemical Technology2012,14,4:3
5Broadband quasi-phase matching in a MgO:PPLN thin film显示文摘Future quantum information networks operated on telecom channels require qubit transfer between different wavelengths while preserving quantum coherence and entanglement. Qubit transfer is a nonlinear optical process,but currently the types of atoms used for quantum information processing and storage are limited by the narrow bandwidth of upconversion available. Here we present the first experimental demonstration of broadband and high-efficiency quasi-phase matching second-harmonic generation(SHG) in a chip-scale periodically poled lithium niobate thin film. We achieve a large bandwidth of up to 2 THz for SHG by satisfying quasi-phase matching and group-velocity matching simultaneously. Furthermore, by changing the film thickness, the central wavelength of the quasi-phase matching SHG bandwidth can be modulated from 2.70 μm to 1.44 μm. The reconfigurable quasi-phase matching lithium niobate thin film provides a significant on-chip integrated platform for photonics and quantum optics.LICHENG GE YUPING CHEN HAOWEI JIANG GUANGZHEN LI BING ZHU YI'AN LIU XIANFENG CHEN 2018Photonics Research2018,6,10:3
6High population and dispersion of pentacoordinated Al~Ⅴ species on the surface of ?ame-made amorphous silica-alumina显示文摘Pentacoordinated Al(Al~Ⅴ)species in silica-alumina are promising to promote the formation of acid sites or act as surface defects for tailoring single-atom catalysts.However,pentahedral coordination(Al~Ⅴ)is rarely observed in conventionally prepared silica-alumina.Here,we show that high population and dispersion of Al~Ⅴ species on the surface of amorphous silica-alumina(ASA)can be achieved by means of flame spray pyrolysis.High resolution TEM/EDX,high magnetic-field NMR and DFT calculations are employed to characterize the structure of as-prepared ASAs.Solid-state ^(27)Al multi-quantum MAS NMR experiments show that most of the Al~Ⅴspecies are formed independently from the alumina phase and are accessible for guest molecules on the surface.Upon water adsorption,these Al~Ⅴ species are transformed to Al~Ⅵ species,structurally similar to surface Al~Ⅳ species,as confirmed by DFT calculations.The outstanding catalytic activity of as-synthesized ASA is demonstrated using the in situ H/D exchange reaction with deuterated benzene as an example.The Al~Ⅴ-rich ASA provides a much lower activation energy(~30 kJ/mol)than that reported for zeolite H-ZSM-5(~60 kJ/mol).The superior catalytic performance is attributed to the high Al~Ⅴcontent promoting the surface active sites in ASA.The knowledge gained on the synthesis of Al~Ⅴ-rich ASAs and the nature of aluminum coordination in these materials could pave the way to more efficient silica-alumina based catalysts.Zichun Wang Yijiao Jiang Xianfeng Yi Cuifeng Zhou Aditya Rawal James Hook Zongwen Liu Feng Deng Anmin Zheng Michael Hunger Alfons Baiker Jun Huang 2019Science Bulletin2019,64,8:2
7Influence of rarefaction wave on premixed flame structure and propagation behavior显示文摘为了在矩形燃烧在结构和 premixed 丙烷 / 空气火焰的繁殖行为上探索变成稀薄波浪的影响,尖叫,高速度 Schlieren 的技术拍摄方法,压力测量等等被用来学习在变成稀薄波浪和火焰之间的相互作用过程。变成稀薄波浪火焰相互作用的二个盒子在实验被执行。两个都,变成稀薄挥动的试验性的结果表演能快速从 laminar 引起火焰转变到狂暴的燃烧。奶牛流动变成稀薄波浪减少当逆流变成稀薄波浪带火焰繁殖速度到总体上增加时,火焰速度与锋利的颤动伴随了。CHEN Xianfeng SUN Jinhua LU Shouxiang CHU Guanquan YAO Liyin LIU Yi 2007Progress in Natural Science:Materials International2007,17,3:1
8Effect of in situ TiB 2 particle reinforcement on the creep resistance of hypoeutectic Al–12Si alloy显示文摘Minhwa Huang Xianfeng Li Hongzhan Yi Naiheng Ma Haowei Wang 2004Journal of Alloys and Compounds2004,,1:1
9Circulating microRNA-122 as a potential biomarker for liver injury显示文摘Xianfeng Ding Jianv Ding Jing Ning Fan Yi Jiankui Chen Deyao Zhao Jiaping Zheng Zicai Liang Zhiyuan Hu Quan Du 2012Molecular Medicine Reports2012,,6:1
10Visual landmark-directed scatter-hoarding of Siberian chipmunks Tamias sibiricus显示文摘Spatial memory of cached food items plays an important role in cache recovery by scatter-hoarding animals.However,whether scatter-hoarding animals intentionally select cache sites with respect to visual landmarks in the environment and then rely on them to recover their cached seeds for later use has not been extensively explored.Furthermore,there is a lack of evidence on whether there are sex differences in visual landmark-based food-hoarding behaviors in small rodents even though male and female animals exhibit different spatial abilities.In the present study,we used a scatter-hoarding animal,the Siberian chipmunk,Tamias sibiricus to explore these questions in semi-natural enclosures.Our results showed that T.sibiricus preferred to establish caches in the shallow pits labeled with visual landmarks(branches of Pinus sylvestris,leaves of Athyrium brevifrons and PVC tubes).In addition,visual landmarks of P.sylvestris facilitated cache recovery by T.sibiricus.We also found significant sex differences in visual landmark-based food-hoarding strategies in Siberian chipmunks.Males,rather than females,chipmunks tended to establish their caches with respect to the visual landmarks.Our studies show that T.sibiricus rely on visual landmarks to establish and recover their caches,and that sex differences exist in visual landmark-based food hoarding in Siberian chipmunks.Dongyuan ZHANG Jia LI Zhenyu WANG Xianfeng YI 2016Integrative Zoology2016,11,3:1
11Covalently tethering disulfonic acid moieties onto polyoxometalate boosts acid strength and catalytic performance for hydroxyalkylation/alkylation reaction显示文摘Solid acid catalysts are widely used in the production of various high-value added and industrially important chemicals.Although the use of organosilicon compounds to modify the vacancy site has been extensively studied,the covalent tethering-SO_(3)H functionalized organosilicon modified polyoxometalates(POMs)has been rarely reported.In this work,two catalysts(TBA_(4)[SiW_(11)O_(39)(O(SiC_(3)H_(6)SO_(3)H)_(2))](compound 2)and TBA_(4)[SiW_(11)O_(39)(O(SiC_(8)H_(8)SO_(3)H)_(2))](compound 3))were synthesized successfully through covalently grafting different sulfonic acid(-SO_(3)H)groups onto[SiW_(11)O_(39)]^(8−)cluster,respectively.Compound 2 was achieved by surface grafting and in situ oxidation(3-mercaptopropyl)-trimethoxysilane,while compound 3 was achieved by surface grafting of 2-(4-chlorosulfonylphenyl)ethyltrimethoxysilane.Strong Brønsted acid strength of compounds 2 and 3 can be demonstrated by different methods including potentiometric titration,pyridine adsorption studies,and the ^(31)P trimethylphosphine oxides(TMPO)nuclear magnetic resonance(NMR).The systematic investigation of the relationship among POM structures,acid strength,and electron density was carried out based on density functional theory(DFT)calculation and experimental results,which revealed that covalent modification of compounds 2 and 3 decreased the electron density of the O-H bond,and promoted the release of H^(+).When applied in hydroxyalkylation/alkylation(HAA)reaction of 2-methylfuran(2-MF)with cyclohexanone,compound 2 exhibited better catalytic performance with conversion of ~93%,monocyclic fuel precursors(1a)yield of 79.9% and selectivity of 85.7% than compound 3,which can be attributed to strong Brønsted acid and the intramolecular hydrogen-bonding interactions between the neighboring -SO_(3)H moieties in compound 2.Finally,compound 2 also showed excellent catalytic activity in the HAA reaction of 2-MF with several different aldehydes and ketones(e.g.,furfuraldehyde,5-methylfurfuraldehyde,acetone,butyraldehyde and 4-methoxybenzaldehyde).This result opens a new pathway for design and fabrication of novel solid acid catalysts.Lifei Lian Yubing Liu Xianfeng Yi Hanbin Hu Xiang Chen Hongqiang Li Wei Chen Anming Zheng Yu-Fei Song 2022Science China Chemistry2022,65,4:1
12Rational construction of multiple hollow silicalite-1 zeolite with enhanced quasi acidity for robust vapor-phase Beckmann rearrangement显示文摘Developing efficient and stable zeolites for vapor-phase Beckmann rearrangement of cyclohexanone oxime is still a great challenge to realizeε-caprolactam(CPL)green production.In this work,the hierarchical porous silicalite-1 zeolites with multiple hollow structure(S-1-M)are explored by in-situ desilication−recrystallization post-treatment of spongy highway-like zeolites(S-1-S),which are synthesized through silanization synthesis of conventional bulky silicalite-1(S-1).Compared to S-1,S-1-M achieves superior catalytic performance,with improving the CPL selectivity from 85.7%to 94.1%and prolonging the catalyst lifetime from 74 to 126 h at a weight hourly space velocity(WHSV)of 6 h^(−1).Comprehensive physiochemical studies demonstrate that the highly dispersed intracrystalline cavities within S-1-M endow greater mass diffusion and better quasi acidity inducing by the enhanced H-bonds among abundant H-bonded silanols,which is cooperatively responsible for its superior catalytic performance.Peng Zhang Xianfeng Yi Changjiu Xia Xinxin Peng Shuai Zhang Chengxiang Li Anmin Zheng Xiaoxin Zhang Yibin Luo Lifeng Cui Fuhong Yu Xingtian Shu 2023Nano Research2023,16,5:1
13Chip-scale spontaneous quasi-phase matched second harmonic generation in a micro-racetrack resonator显示文摘In this paper,we demonstrate efficient spontaneous quasi-phase matched(SQPM)second harmonic generation(SHG)in a microracetrack resonator on X-cut thin film lithium niobate.Our approach does not involve poling,but exploits the anisotropy of the crystals to allow the phase-matching condition to be fulfilled spontaneously as the TE-polarized light circulates in a specifically designed racetrack resonator.In experiment,normalized on-chip conversion efficiencies of 1.01×10-4/W and 0.43×10-4/W are achieved by 37th-order and 111th-order SQPM,respectively.The configurable SQPM will benefit the application of nonlinear frequency conversion and quantum source generation in chip-scale integrated photonics compatible with standard CMOS fabrication processes.Tingge Yuan Jiangwei Wu Yi'an Liu Xiongshuo Yan Haowei Jiang Hao Li Zhaokang Liang Qiang Lin Yuping Chen Xianfeng Chen 2023Science China(Physics,Mechanics & Astronomy)2023,66,8:1
14Exclusion of interspecific competition reduces scatter-hoarding of Siberian chipmunk Tamias sibiricus:A field study显示文摘Although food availability and the abundance of seed predators have been postulated to affect seed dispersal,it is not clear how seed-eating animals modify their scatter-hoarding strategies in response to different levels of in­terspecific competition.We placed paired germinated and ungerminated acorns of Quercus mongolica on 30-cm high platforms to exclude potential interspecific competition of the predominant larder hoarders Apodemus pen­insulae and Myodes rufocanus,to investigate seed dispersal by a predominant scatter-hoarder,Tamias sibiricus,in the field in north-eastern China.Our results showed that T.sibiricus ate more acorns in situ in the absence of interspecific competition.In the presence of interspecific competition of A.peninsulae and C.rufocanus,how­ever,more acorns were scatter-hoarded by T.sibiricus.Regardless of interspecific competition,germination of acorns showed no significant effects on seed dispersal patterns,inconsistent with the“seed perishability hypoth­esis”that animals avoid hoarding seeds with high perishability.Exclusion of interspecific competition,though relatively increasing the per capita seed abundance,appears to reduce seed dispersal,scatter-hoarding and seed­ling establishment.Therefore,we propose that moderate interspecific competition rather than competition ex­clusion may benefit seed scatter-hoarding and seedling establishment.Yinhua DENG Mengyao JU Xianfeng YI 2020Integrative Zoology2020,15,2:0
15Plant-animal interactions: patterns and mechanisms in terrestrial ecosystems显示文摘From the early work of Darwin,then Ehrlich and Raven(1964),to the recent novel contribution of mutualistic networks developed by Jordano and colleagues(Bascompte and Jordano 2007,Nuismer et al.2013,Guimarães et al.2017),it is clear that plant-animal interactions—especially those involving herbivory,seed dispersal,seed predation and pollination—are significant drivers of ecological processes and the evolution and maintenance of biodiversity.The vast majority of plant species,for example,are influenced by animal-mediated seed dispersal and pollination.Michael A.STEELE Xianfeng YI Hongmao ZHANG 2018Integrative Zoology2018,13,3:0
16Acorn size and tolerance to seed predators:the multiple roles of acorns as food for seed predators,fruit for dispersal and fuel for growth显示文摘Fitness of parents and offspring is affected by offspring size.In oaks(Quercus spp.),acorns vary considerably in size across,and within,species.Seed size influences dispersal and establishment of oaks,but it is not known whether size imparts tolerance to seed predators.Here,we examine the relative extent to which cotyledon size serves as both a means for sustaining partial consumption and energy reserves for developing seedlings during early stages of establishment.Acorns of 6 oak species were damaged to simulate acorn predation by vertebrate and invertebrate seed predators.Seedling germination/emergence and growth rates were used to assess seedling performance.We predicted that if cotyledons are important for dispersal,acorns should show tolerance to partial seed consumption.Alternatively,if the cotyledon functions primarily as an energy reserve,damage should significantly influence seedling performance.Acorns of each species germinated and produced seedlings even after removing>50%of the cotyledon.Seed mass explained only some of the variation in performance.Within species,larger acorns performed better than smaller acorns when damaged.Undamaged acorns performed as well or better than damaged acorns.There was no pattern among individual species with increasing amounts of damage.In some species,simulated invertebrate damage resulted in the poorest performance,suggesting alternative strategies of oaks to sustain damage.Large cotyledons in acorns may be important for attracting seed dispersers and sustaining partial damage,while also providing energy to young seedlings.Success of oak establishment may follow from the resilience of acorns to sustain damage at an early stage.Andrew W.BARTLOW Salvatore JAGOSTA Rachel CURTIS Xianfeng YI Michael ASTEELE 2018Integrative Zoology2018,13,3:0
17Visual and auditory cues facilitate cache pilferage of Siberian chipmunks(Tamias sibiricus)under indoor conditions显示文摘In the struggle for survival,scatter-hoarding rodents are known to cache food and pilfer the caches of others.The extent to which rodents utilize auditory/visual cues from conspecifics to improve cache-pilfering is un­known.Here,Siberian chipmunks(Tamias sibiricus)were allowed to search for caches of Corylus heterophyl­la seeds(man-made caches and animal-made caches)after experiencing cues from a conspecific’s cache-search­ing events.For each type of cache,3 experimental scenarios were presented:(1)alone(control);(2)auditory/visual(hearing and seeing conspecific’s cache-searching events);and(3)auditory only(hearing conspecific’s cache-searching events only)with random orders.The subjects located man-made caches faster,harvested more caches,and hoarded more seeds both in the auditory/visual and the auditory only treatments compared to the control,while scatter-hoarding more seeds in the auditory/visual treatment but larder-hoarding more seeds in the auditory only treatment.Compared to the control,the animals spent less time locating animal-made caches,har­vested more caches,ate fewer seeds,larder-hoarded more seeds and hoarded more seeds in total both in the au­ditory/visual and the auditory only treatments,while eating more seeds and hoarded fewer seeds in total in the auditory only treatment than in the auditory/visual treatment.The results also show that females spent less time locating the animal-made caches,but they scatter-hoarded fewer seeds than males in the auditory/visual treat­ment.To the best of our knowledge,this is the first report that visual and/or auditory cues of conspecifics im­prove cache-pilfering and hoarding in rodents.Hongyu NIU Wei CHU Xianfeng YI Hongmao ZHANG 2019Integrative Zoology2019,14,4:0
18Development of A High-throughput Molecular Identification Method Suitable for Fungi显示文摘Fungi play a significant role in biology-related domains,and with the molecular biology technology advancing,identification of fungi at molecular level and verification of genetic transformant has become the necessary step of test. By far,however,there is no ideal high-throughput molecular identification method.In this paper,a high-throughput device was designed,and a novel PCR-mediated molecular identification method suitable for the device was developed. Through cloning of cellulase encoding genes and regulatory genes on the genome of Trichoderma reesei,cloning of promoter of phosphoglycerate kinase gene 1 and xylanase encoding genes on the genome and expression vector of Saccharomyces cerevisiae,and ITS sequences cloning and RAPD analysis of T. reesei,S. cerevisiae,Penicillium oxalicum,Rhizopus stolonifer,Aspergillus niger,A. carbonarius and A. japonicas,the method turned out to be an effective one with wide application potential.The establishment of the method has worked out the bottleneck of high-throughput molecular identification.Cao Shuwei Cai Xiaoyan Lai Dawei Yi Xianfeng Huang Ribo Lai Zhiqiang 2016Animal Husbandry and Feed Science2016,8,6:0
19Effect of Shading on Growth and Physiological Characteristics of Alfalfa, Medicago sativa显示文摘In order to select the suitable alfalfa varieties for the shade areas in vineyard of Northwest,four shasing treatments R_0,R_1,R_2,R_3( full light,60% of full light,30% of full light,10% of full light) were set in the experiment to study the growth and physiological characteristics of seven domestic and foreign alfalfa varieties. The results showed that there was a big difference in height of alfalfa among cultivars under shading; leaf area,leaf dry weight and leaf number reduced significantly with the decrease of light intensity( P < 0. 05); relative growth ratio,soluble sugar content,chlorophyll a / b decreased with the increase of shading intensity. The first harvest yield decreased significantly with the increasing shading intensity,AmeriS tand and Queen declined less than others. In summary,the suitable alfalfa cultivars for plantation were Queen,Alfalfa and AmeriS tand in the northwest area where the habitat was similar with the habitat of experimental site,but due to the relativity of shading ability,the shading intensity could not exceed 50%.Shi Jing Chen Benjian Lan Xi Yin Guoli Yao Na Yi Xianfeng Wei Jinyi 2016Animal Husbandry and Feed Science2016,8,2:0
20Effect of Pennisetum purpureum Schum cv. Guiminyin on Milk Yield and Quality of Jersey Cattle at Lactation Stage显示文摘The study aimed to research the forage value of Pennisetum purpureum Schum cv.Guiminyin in dairy industry and then provide scientific support for feeding jersey cattle with P.purpureum Schum cv.Guiminyin.Totally 20 jersey cattle at lactation stage were selected and divided into two groups randomly,10 cattle each group.The cattle were fed with P.purpureum Schum cv.Guiminyin and P.purpureum cv.Mott×(P.americanum×P.purureum)cv.Guimu No.1,respectively.The results showed that P.purpureum Schum cv.Guiminyin performed well in both nutritional value and palatability,and received remarkable effects on jersey cattle.The milk yield was 5.4%higher than that of before test,and the average daily milk yield was(11.65±0.07)kg/cattle.Compared with control group,milk fat percentage,lactoprotein content and overall milk-solid content were improved somewhat.Feeding jersey cattle with P.purpureum Schum cv.Guiminyin at lactation stage could increase their milk yield and milk quality.Yao Na Teng Shaohua Lai Zhiqiang Yi Xianfeng Qiu Jinhua Deng Suyuan Lai Dawei 2016Animal Husbandry and Feed Science2016,8,3:0
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