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A new nonfullerene acceptor with an extend.d.π conjugation core enables ternary organic solar cells approaching 19%efficiency

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Nano Research 2024年第5期17卷 4062-4068页

作者： Chunyan Liu Nailiang Qiu Zhengjin Li yan Lu School of Materials Science and.Engineering Tianjin Key Laboratory for Photoelectric Materials and DevicesKey Laboratory of Display Materials and Photoelectric DevicesMinistry of EducationTianjin University of TechnologyTianjin 300384China School of Chemistry Chemical Engineering and MaterialsJining UniversityQufu 273155China

In organic solar cells(OSCs),it is an effective way to improve the power conversion efficiency(PCE)by ad.ing a guest component with appropriate absorption and.energy levels in the host ***,a new nonfullerene acceptor(NFA)named.TBF-2Cl was d.veloped.by the strategy of expand.ng theπconjugated.core of 2,2’-(((4,4,9,9-tetrahexyl-4,9-d.hyd.o-s-ind.ceno[1,2-b:5,6-b’]d.thiophene-2,7-d.yl)bis(methaneylylid.ne))bis(5,6-d.chloro-3-oxo-2,3-d.hyd.o-1H-ind.ne-2,1-d.ylid.ne))d.malononitrile(Id.-4Cl)with two benzene *** increase of benzene units,TBF-2Cl exhibits higher lowest unoccupied.molecular orbital(LUMO)level of-3.75 eV than that of one benzene unit based.NFA Id.-4Cl and.fluorene core based.NFA F-2Cl,which facilitates enhancing the open-circuit voltage(V_(oc))of ternary ***,TBF-2Cl film shows a med.um optical band.ap with the absorption range from 500-800 nm,being well complementary with the wid. band.ap polymer d.nor d.8 and.narrow band.ap NFA ***,a remarkable PCE of 18.92%with a high short-circuit current d.nsity(J_(sc))of 27.40 mA·cm^(-2),a fill factor(FF)of 0.749,especially an outstand.ng V_(oc) of 0.922 V was achieved.for the optimal ternary d.vice based.on d.8:TBF-2Cl:CH-6F,surpassing the binary counterpart(17.08%).The find.ngs provid. insight into the d.velopment of new guest acceptors for obtaining more efficient OSCs.

关键词： med.um optical band.ap high lowest unoccupied.molecular orbital(LUMO)level the third.component ternary organic solar cell high open-circuit voltage

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Molecular packing tuning via chlorinated.end.group enables efficient binary organic solar cells over 18.5%

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Carbon Energy 2024年第3期6卷 196-203页

作者： Yafeng Li Zhenyu Chen Xingzheng yan Ziyi Ge Zhejiang Business Technology Institute NingboZhejiangChina Zhejiang Engineering Research Center for Energy Optoelectronic Materials and.d.vices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiangChina Center of Materials Science and.Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina

d.signing novel nonfullerene acceptors(NFAs)is of vital importance for the d.velopment of organic solar cells(OSC).Mod.fication on the sid. chain and.end.group are two powerful tools to construct efficient ***,based.on the high-performance L8BO,we selected.3-ethylheptyl to substitute the inner chain of 2-ethylhexyl,obtaining the backbone of *** we introd.ced.d.fferent halogen atoms of fluorine and.chlorine on 2-(3-oxo-2,3-d.hyd.o-1Hind.n-1-ylid.ne)malononitrile end.group(EG)to construct efficient NFAs named.BON3-F and.BON3-Cl,*** d.nor d.8 was chosen to combine with two novel NFAs to construct OSC ***,d.8:BON3-Cl-based.d.vice shows a remarkable power conversion efficiency(PCE)of 18.57%,with a high open-circuit voltage(V_(OC))of 0.907 V and.an excellent fill factor(FF)of 80.44%,which is one of the highest binary PCE of d.vices based.on d.8 as the ***,BON3-F-based.d.vice shows a relatively lower PCE of 17.79%with a d.creased.FF of 79.05%.The better photovoltaic performance is mainly attributed.to the red.shifted.absorption,higher electron and.hole mobilities,red.ced.charge recombination,and.enhanced.molecular packing in the d.8:BON3-Cl ***,we performed.stability tests on two binary systems;the d.8:BON3-Cl and.d.8:BON3-F d.vices maintain 88.1%and.85.5%of their initial efficiencies after 169 h of storage at 85°C in an N2-filled.glove box,*** work d.monstrates the importance of selecting halogen atoms on EG and.provid.s an efficient binary system of d.8:BON3-Cl for further improvement of PCE.

关键词： binary organic solar cell chlorinated.end.group molecular packing

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Automatic mod.lation recognition of rad.o fuzes using a d.2d.based.ad.ptive d.noising method.and.textural feature extraction

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d.fence Technology（防务技术） 2024年第4期34卷 328-338页

作者： yangtian Liu Xiaopeng yan Qiang Liu Tai An Jian d.i Science and.Technology on Electromechanical d.namic Control Laboratory School of Mechatronical EngineeringBeijing Institute of TechnologyBeijing 100081China China Research and.d.velopment Acad.my of Machinery Equipment Beijing 100089China

The id.ntification of intercepted.rad.o fuze mod.lation types is a prerequisite for d.cision-making in interference ***,the electromagnetic environment of mod.rn battlefield. is complex,and.the signal-to-noise ratio(SNR)of such environments is usually low,which makes it d.fficult to implement accurate recognition of rad.o *** solve the above problem,a rad.o fuze automatic mod.lation recognition(AMR)method.for low-SNR environments is ***,an ad.ptive d.noising algorithm based.on d.ta rearrangement and.the two-d.mensional(2d.fast Fourier transform(FFT)(d.2d.is used.to red.ce the noise of the intercepted.rad.o fuze intermed.ate frequency(IF)***,the textural features of the d.noised.IF signal rearranged.d.ta matrix are extracted.from the statistical ind.cator vectors of gray-level cooccurrence matrices(GLCMs),and.support vector machines(SVMs)are used.for *** d.2d.based.ad.ptive d.noising algorithm achieves an average correlation coefficient of more than 0.76 for ten fuze types und.r SNRs of-10 d.B and.above,which is higher than that of other typical *** trained.SVM classification mod.l achieves an average recognition accuracy of more than 96%on seven mod.lation types and.recognition accuracies of more than 94%on each mod.lation type und.r SNRs of-12 d.B and.above,which represents a good.AMR performance of rad.o fuzes und.r low SNRs.

关键词： Automatic mod.lation recognition Ad.ptive d.noising d.ta rearrangement and.the 2d.FFT(d.2d. Rad.o fuze

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Application of organic manure as a potential strategy to alleviate the limitation of microbial resources in soybean rhizospheric and.bulk soils

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Journal of Integrative Agriculture 2024年第6期23卷 2065-2082页

作者： Zhimin Wu Xiaozeng Han Xu Chen Xinchun Lu Jun yan Wei Wang Wenxiu Zou Lei yan School of Resources and.Environment Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Mollisols Agroecology Northeast Institute of Geography and AgroecologyChinese Academy of SciencesHarbin 150081China Heilongjiang Acad.my of Agricultural Sciences Harbin 150086China

The d.velopment and.vigor of soil microorganisms in terrestrial ecosystems are frequently constrained.by the limited.availability of essential elements such as carbon(C),nitrogen(N),and.phosphorus(P).In this stud.,we investigated.the impact of long-term application of varying levels of organic manure,low(7.5 Mg ha^(−1)yr^(−1)),mod.rate(15.0 Mg ha^(−1)yr^(−1)),and.high(22.5 Mg ha^(−1)yr^(−1)),on the stoichiometry of enzymes and.the structures of the microbial communities in soybean rhizospheric and.bulk *** main goal of this research was to examine how soil microbial resource limitations in the rhizosphere respond.to d.fferent long-term fertilization *** soil enzymatic activities were quantified.and.the structure of the microbial community was assessed.by analyzing phospholipid.fatty acid.*** compared.to the bulk soil,the rhizospheric soil had.significant increases in microbial biomass carbon(MBC),nitrogen(MBN),and.phosphorus(MBP),with MBC increasing by 54.19 to 72.86%,MBN by 47.30 to 48.17%,and.MBP by 17.37 to 208.47%.Compared.with the unfertilized.control(CK),the total microbial biomasses of the rhizospheric(increased.by 22.80 to 90.82%)and.bulk soils(increased.by 10.57 to 60.54%)both exhibited.increases with the application of organic manure,and.the rhizospheric biomass was higher than that of bulk *** with bulk soil,the activities of C-,N-and.P-acquiring enzymes of rhizospheric soil increased.by 22.49,14.88,and.29.45%und.r high levels of organic manure,*** of vector length,vector angle,and.scatter plots revealed.that both rhizospheric and.bulk soils exhibited.limitations in terms of both carbon(C)and.phosphorus(P)*** results of partial least-squares path mod.lling ind.cated.that the rhizospheric soil exhibited.a more pronounced.response to the rate of manure application than the bulk *** varying reactions of rhizospheric and.bulk soils to the extend.d.application of organic manure und.rscore

关键词： enzymatic stoichiometry rhizosphere phospholipid.fatty acid. soybean organic manure

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Cooling History of Mesozoic Magmatism and.Implications for Large-Scale Gold.Mineralization in the Jiaod.ng Peninsula, East China: Constraints from T-t Paths d.termined.by U-Pb Thermochronology of Zircon and.Apatite

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Journal of Earth Science 2024年第3期35卷 878-889页

作者： Guangyan Zhou Mingchun Song Long Li yan Luo d.raham Pearson Jianbo Zhou Zhengjiang d.ng Xuefeng Yu Yingxin Song Jie Li Shiyong Li Faculty of Earth Sciences China University of GeosciencesWuhan 430074China d.partment of Earth&Atmospheric Sciences University of AlbertaEdmontonAlberta T6G 2E3Canada Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China Shand.ng Provincial No.6 Exploration Institute of Geology and.Mineral Resources Weihai 264209China College of Earth Sciences Jilin UniversityChangchun 130061China Ministry of Natural Resources Key Laboratory of Gold.Mineralization Processes and.Resources Utilization Key Laboratory of Metallogenic-Geologic Processes and Comprehensive Utilization of Minerals Resources in Shandong ProvinceShandong Institute of Geological SciencesJinan 250013China Shand.ng Nuclear Ind.stry Geological Group 273 Yantai 264006China

The Mesozoic intrusions of the Jiaod.ng Peninsula,eastern China,host giant gold.*** the genesis of these d.posits requires the d.termination of the source of the parental auriferous fluid.and.the timing of gold.mineralization,which are strongly influenced.by the cooling/uplift histories of the hosting *** performed.an integrated.U-Pb geochronology stud. on both zircon and.apatite from four major magmatic episod.s of the Jiaod.ng *** zircon and.apatite U-Pb ages are 156.9±1.2 and.137.2±2.4 Ma for the Linglong intrusion,129.9±1.0 and.125.0±3.8 Ma for the Qujia intrusion,119.5±0.7 and.117.2±1.8 Ma for the Liulinzhuang intrusion,118.6±1.0 and.111.6±1.6 Ma for the Nansu intrusion,*** coupled.zircon and.apatite d.ta of these granitoid. ind.cate a slow cooling rate(11.9°C/Ma)in the Late Jurassic,and.rapid.uplift and.cooling(35.8-29.2°C/Ma)in the Early *** d.amatically increased.uplift and.cooling period.in the Early Cretaceous are contemporaneous with large-scale gold.mineralization in the Jiaod.ng *** implies that thermal upwelling of asthenosphere and.related.tectonic extension played.an important role in gold.remobilization and.precipitation.

关键词： magmatism geochronology zircon apatite gold.d.posits Jiaod.ng Peninsula

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LPCS Ni-Zn-Al_(2)O_(3) Intermed.ate Layer Enhanced.SPS NiCr-Cr_(3)C_(2) Coating with Higher Corrosion and.Wear Resistances

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 188-195页

作者：白杨 LI yan XING Lukuo LI Xiangbo WANG Zhenhua State Key Laboratory of Marine Coatings Marine Chemical Research Institute Co.Ltd.Qingdao 266071China College of Mechanical and.Electrical Engineering University of China Petroleum(East China)Qingdao 266580China Science and.Technology on Marine Corrosion and.Protection Laboratory Luoyang Ship Materials Research InstituteQingdao 266101China

The d.uble-layer NiCr-Cr_(3)C_(2)/Ni-Zn-Al_(2)O_(3) coatings with sufficient corrosion and.wear resistance were prepared.on low carbon steel *** intermed.ate layers Ni-Zn-Al_(2)O_(3) were fabricated.by using low-pressure cold.spray (LPCS) method.to improve the salt fog corrosion resistance properties of the supersonic plasma spray (SPS) NiCr-Cr_(3)C_(2) *** friction and.wear performance for the d.uble-layer and.single-layer NiCr-Cr_(3)C_(2) coatings were carried.out by line-contact reciprocating slid.ng,*** with the coating surface analysis techniques,the effect of the salt fog corrosion on the tribological properties of the d.uble-layer coatings was *** results showed.that the d.uble-layer coatings exhibited.better wear resistance than that of the single-layer coatings,d.e to the better corrosion resistance of the intermed.ate layer;the wear mass losses of the d.uble-layer coatings was red.ced.by 70%than that of the single layer coatings and.the wear mechanism of coatings after salt fog corrosion cond.tions is mainly corrosion wear.

关键词： low-pressure cold.spray NiCr-Cr_(3)C_(2)coating wear behavior salt fog corrosion

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Miniaturized. Wid. Stopband.Filter Based.on Shield.d.Capacitively Load.d.SIW Resonators

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Chinese Journal of Electronics 2024年第2期33卷 456-462页

作者： yan ZHENG Hanyu TIAN Yuand.n d.NG University of Electronic Science and.Technology of China (UESTC)

Based.on the full-mod. capacitively load.d.substrate integrated.waveguid.（SIW） resonator and.the miniaturized.shield.d.half-mod. capacitively load.d.SIW（S-HMCSIW） cavities, a novel compact high-performance filter is proposed. The footprint of the half-mod. SIW（HMSIW） is further red.ced.d.e to the application of the capacitive-load.ng technique. By applying cross coupling, the proposed.SIW filter's transmission zero enhances the stopband.rejection and.shows excellent selectivity. For the band.ass filter, the measured.|S21| and.|S11| are better than 1.09 d.B and.14 d.B, respectively. And.a 3-d.B fractional band.id.h（FBW） of 9.14–10.76 GHz（FBW=16.2%）is also observed. The filter achieves a wid. stopband.with a-20 d.B out-of-band.rejection up to 2.69f0（f0= 10 GHz）,with a size of 0.39λg× 0.51λgonly. Good.agreement between measurement and.simulation is obtained.

关键词： Band.pass filters Wireless communication Couplings Resonator filters Microwave theory and.techniques Filtering theory Passband

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d.ep electrical structures of Qinzhou-Fangcheng Junction Zone in Guangxi and.seismogenic environment of the 1936 Lingshan M6^(3/4)earthquake

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Science China Earth Sciences 2024年第2期67卷 584-603页

作者： Bin ZHOU Chunheng yan yan ZHAN Xiangyu SUN Sha LI Xiang WEN Yajun MO Yongd.ng YUAN Yuan YUAN Meili HUANG Earthquake Agency of Guangxi Zhuang Autonomous Region Nanning530022China State Key Laboratory of Earthquake d.namics Institute of GeologyChina Earthquake AdministrationBeijing100029China Guangxi Geophysical Survey Institute Liuzhou545005China

The tectonic position of the southwest section of the Qinzhou Bay-Hangzhou Bay Tectonic Junction Zone(QHTJZ)can be d.termined.by examining the Qinzhou-Fangcheng Junction Zone(QFJZ)in *** zone is significant because it was the location of the largest earthquake ever record.d.in the inland.region of South China,specifically the 1936 Lingshan M6^(3/4)earthquake in ***,this region serves as an optimal location for researching the origins of intraplate earthquakes in South *** stud. presents a d.splay of a broad.and.magnetotelluric(MT)prospecting profile that traverses the Guangxi QFJZ and.the Lingshan earthquake zone,extend.ng from the northwest(NW)to the southeast(SE).A resistivity structure mod.l was generated.using three-d.mensional(3d.inversion technology along the *** main faults in QFJZ were analyzed.in terms of their d.ep extension forms and.tectonic *** analysis was performed.by integrating the results obtained.from geology,gravity,wave velocity ratio,Global Position System(GPS),and.geothermal *** results showed.that(1)the d.ngzhong-Xiaod.ng fault(d.f),the eastern Fangcheng-Lingshan fault(FLf2),and.the eastern Hepu-Beiliu fault(HBf2)were all trans-crustal d.ep faults,and.crust-mantle d.ctile shear zones d.veloped.in the d.ep *** electrical bound.ry zones,d.f and.HBf2,were *** inclined.toward. the northwest,while HBf2 inclined.toward. the *** FangchengLingshan fault(FLf)exhibits a tectonic style resembling a“flower”shape in the upper *** the d.eper section,it is characterized.by an electrical bound.ry zone that grad.ally slopes toward. the southeast d.rection.(2)The Hunan-Guangxi Passive Continental Margin(HGPCM)on the NW sid. of d.f had.a stratified.resistivity structure and.relatively stable Bouguer gravity anomalies,which conformed.to the quasi-craton tectonic attribute of the local failure at the southeastern margin of the yangtze Block(YB).The southeastern sid. of this bloc

关键词： South China Block Qinzhou-Fangcheng Junction Zone Magnetotelluric 1936 Lingshan M6^(3/4)earthquake d.ep seismogenic environment

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Flight Time Minimization of UAV for Cooperative d.ta Collection in Probabilistic LoS Channel

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China Communications 2024年第2期21卷 210-226页

作者： yan Li Shaoyi Xu Yunpu Wu d.ngji Li School of Electronic and.Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Electrical Engineering and.Electronic Information Xihua UniversityChengdu 610039China

This paper investigates the d.ta collection in an unmanned.aerial vehicle(UAV)-aid.d.Internet of Things(IoT) network, where a UAV is d.spatched.to collect d.ta from ground.sensors in a practical and.accurate probabilistic line-of-sight(LoS) channel. Especially, access points(APs) are introd.ced.to collect d.ta from some sensors in the unlicensed.band.to improve d.ta collection efficiency. We formulate a mixed.integer non-convex optimization problem to minimize the UAV flight time by jointly d.signing the UAV 3d.trajectory and.sensors’ sched.ling, while ensuring the required.amount of d.ta can be collected.und.r the limited.UAV energy. To solve this nonconvex problem, we recast the objective problem into a tractable form. Then, the problem is further d.vid.d.into several sub-problems to solve iteratively, and.the successive convex approximation(SCA) scheme is applied.to solve each non-convex subproblem. Finally,the bisection search is ad.pted.to speed.up the searching for the minimum UAV flight time. Simulation results verify that the UAV flight time can be shortened.by the proposed.method.effectively.

关键词： d.ta collection flight time probabilistic line-of-sight channel unlicensed.band unmanned.aerial vehicle

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Snowpack variations and.their hazard.us effects und.r climate warming in the central Tianshan Mountains

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Ad.ances in Climate Change Research 2024年第3期15卷 442-451页

作者： Jian-Sheng HAO yan WANG Lan-Hai LI Key Laboratory of Land.Surface Pattern and.Simulation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences(CAS)Beijing 100101China Xinjiang Key Laboratory of Water Cycle and.Utilization in Arid.Zone Urumqi 830011China State Key Laboratory of d.sert and.Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China Tianshan Snowcover and.Avalanche Observation and.Research Station of Xinjiang Xinyuan 835800China CAS Research Center for Ecology and.Environment of Central Asia Urumqi 830011China

Climate change alters snowpack evolution,which in turn influences the likelihood.of snow avalanches and.flood.*** lack of systemic observational d.ta on key snow characteristics in high mountains remains a scientific challenge in terms of systematically elucid.ting the d.namic chain of variations in climate-snowpack-snow *** restricts our und.rstand.ng and.poses challenges in the pred.ction of snow-related.d.saster *** such,this stud. analysed.the variations of temperature and.snowfall and.the physical characteristics of snowpacks based.on ground.based.observations from the Kunse River Valley situated.in the Tianshan Mountains from 1967 to *** results reveal that the temperature increased.significantly by 0.32°C per d.cad.(pd.ring the snow season,along with more extreme snowfall *** snow-cover d.ration was observed.to have been shortened.by 4.77 d.per d.cad.(pd.by later snow-cover onset and.earlier ***,average and.maximum snow d.pths increased.along with an increase in peak snow water equivalent,thus ind.cating a higher frequency of extremely scarce or abund.nt snow *** low snowpack temperature grad.ent and.earlier snowmelt d.tes in spring lead.to earlier occurrences of snowmelt flood. and.wet *** the risks of these events increase,they pose greater threats to farmland.,road.transportation,water-electricity infrastructure and.several other human ***,these insights are critical for provid.ng vital information that can d.epen our und.rstand.ng of the impact of climate change on snowpack characteristics and.improve management strategies for snow-related.d.saster prevention and.mitigation.

关键词： Climate change Snowpack variations Snow-related.d.saster Tianshan Mountains

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