期刊文献+

二次检索

题名
关键词
文摘
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息

年份

学科

共找到15,211篇文章
< 1 2 250 >
每页显示 20 50 100
Efficient PbS quantum dots tandem solar cells through compatible interconnection layer
1
作者 Gomaa Mohamed Gomaa Khalaf Xinzhao Zhao +6 位作者 Mingyu Li Chunxia Li Salman Ali Tianjun Ma Hsien-Yi Hsu Jianbin Zhang Haisheng Song 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第11期47-57,共11页
Lead sulfide quantum dots(PbS QDs) hold unique characteristics, including bandgap tunability, solutionprocessability etc., which make them highly applicable in tandem solar cells(TSCs). In all QD TSCs, its efficiency ... Lead sulfide quantum dots(PbS QDs) hold unique characteristics, including bandgap tunability, solutionprocessability etc., which make them highly applicable in tandem solar cells(TSCs). In all QD TSCs, its efficiency lags much behind to their single junction counterparts due to the deficient interconnection layer(ICL) and defective subcells. To improve TSCs performance, we developed three kinds of ICL structures based on 1.34 and 0.96 e V PbS QDs subcells. The control, 1,2-ethanedithiol capped PbS QDs(PbS-EDT)/Au/tin dioxide(SnO_(2))/zinc oxide(Zn O), utilized SnO_(2) layer to obtain high surface compactness.However, its energy level mismatch causes incomplete recombination. Bypassing it, the second ICL(PbS-EDT/Au/Zn O) removed SnO_(2) and boosted the power conversion efficiency(PCE) from 5.75% to 8.69%. In the third ICL(PbS-EDT/poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine](PTAA)/Au/Zn O), a thin layer of PTAA can effectively fill fissures on the surface of PbS-EDT and also protect the front cells from solvent penetration. This TSC obtained a PCE of 9.49% with an open circuit voltage of 0.91 V, a short circuit current density of 15.47 m A/cm~2, and a fill factor of 67.7%. To the best of our knowledge, this was the highest PCE achieved by all PbS QD TSCs reported to date. These TSCs maintained stable performance for a long working time under ambient conditions. 展开更多
关键词 Quantum dots tandem solar cell Interconnection layer HYSTERESIS DEFECT
下载PDF
Experimental Study on Vortex-Induced Vibration of Rough Risers Coupling with Interference Effect in Tandem Arrangement
2
作者 HU Ze-bo LIU Zhen +4 位作者 LI Peng GUO Hai-yan REN Xiao-hui HOU Hao HAO Lian-hong 《China Ocean Engineering》 SCIE EI CSCD 2024年第3期394-407,共14页
In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference ef... In order to study the response law of vortex-induced vibration(VIV)of marine risers under the combined action of roughness and interference effects,and to reveal the coupling mechanism of roughness and interference effects on the riser,a VIV experiment of rough risers in tandem arrangement was conducted in a wave−current combined flume.The experiment characterized the risers’roughness by arranging different specifications of attachments on the surface of the risers.Three rough risers with different roughness and smooth risers were arranged in tandem arrangement,with the rough risers arranged downstream.The experimental results indicate that the suppression of the attachments on the downstream risers’vibration are more significant both in the CF and IL directions as the reduced velocity increases.For the downstream riser,the amplitude response of rough riser is more significantly weakened compared with the smooth one at high reduced velocity.For the upstream risers,changes in the roughness and spacing ratio have an impact on their‘lock-in’region.When the roughness of downstream risers is relatively large(0.1300)and the spacing between risers is small(S/D=4.0),the reduced velocity range of‘lock-in’region in the CF direction of upstream risers is obviously expanded,and the displacement in the‘lock-in’region is severer. 展开更多
关键词 marine riser vortex-induced vibration tandem arrangement ROUGHNESS interference effect
下载PDF
Surface repair of wide-bandgap perovskites for high-performance all-perovskite tandem solar cells
3
作者 Xiaojing Lv Weisheng Li +11 位作者 Jin Zhang Yujie Yang Xuefei Jia Yitong Ji Qianqian Lin Wenchao Huang Tongle Bu Zhiwei Ren Canglang Yao Fuzhi Huang Yi-Bing Cheng Jinhui Tong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期64-70,I0003,共8页
Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar cells.However,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily ... Wide-bandgap(WBG)perovskite solar cells(PSCs)play a fundamental role in perovskite-based tandem solar cells.However,the efficiency of WBG PSCs is limited by significant open-circuit voltage losses,which are primarily caused by surface defects.In this study,we present a novel method for modifying surfaces using the multifunctional S-ethylisothiourea hydrobromide(SEBr),which can passivate both Pb^(-1)and FA^(-1)terminated surfaces,Moreover,the SEBr upshifted the Fermi level at the perovskite interface,thereby promoting carrier collection.This proposed method was effective for both 1.67 and 1.77 eV WBG PSCs,achieving power conversion efficiencies(PCEs)of 22.47%and 19.90%,respectively,with V_(OC)values of 1.28 and 1.33 V,along with improved film and device stability.With this advancement,we were able to fabricate monolithic all-perovskite tandem solar cells with a champion PCE of 27.10%,This research offers valuable insights for passivating the surface trap states of WBG perovskite through rational multifunctional molecular engineering. 展开更多
关键词 Wide-bandgap perovskite Surface defect Multifunctional molecule All-perovskite tandem solar cells
下载PDF
Bias-Free Solar-to-Hydrogen Conversion in a BiVO_(4)/PM6:Y6 Compact Tandem with Optically Balanced Light Absorption
4
作者 Catarina G.Ferreira Constanza Sansierra +3 位作者 Francisco Bernal-Texca Mingyu Zhang Carles Ros Jordi Martorell 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第4期231-238,共8页
The high voltage required to overcome the thermodynamic threshold and the complicated kinetics of the water splitting reaction limit the efficiency of single semiconductor-based photoelectrochemistry.A semiconductor/s... The high voltage required to overcome the thermodynamic threshold and the complicated kinetics of the water splitting reaction limit the efficiency of single semiconductor-based photoelectrochemistry.A semiconductor/solar cell tandem structure has been theoretically demonstrated as a viable path to achieve an efficient direct transformation of sunlight into chemical energy.However,compact designs exhibiting the indispensable optimally balanced light absorption have not been demonstrated.In the current work,we design and implement a compact tandem providing the complementary absorption of a highly transparent BiVO_(4)photoanode and a PM6:Y6 solar cell.Such bandgap combination approaches the optimal to reach the solar-to-hydrogen(STH)conversion upper limit for tandem photoelectrochemical cells(PECs).We demonstrate that,by using a photonic multilayer structure to adequately balance sunlight absorption among both tandem materials,a 25%increase in the bias-free STH conversion can be achieved,setting a clear path to take compact tandem PECs to the theoretical limit performance. 展开更多
关键词 bismuth vanadate compact tandem organic solar cells photonic multilayers solar-to-hydrogen conversion
下载PDF
Electrochemically Deposited CZTSSe Thin Films for Monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17%
5
作者 Sun Kyung Hwang Ik Jae Park +3 位作者 Se Won Seo Jae Hyun Park So Jeong Park Jin Young Kim 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第1期147-152,共6页
In spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been demonstrated due to the difficulty in im... In spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been demonstrated due to the difficulty in implementing solution-processed perovskite top cell on the rough surface of the bottom cells.Here,we firstly demonstrate an efficient monolithic two-terminal perovskite/CZTSSe tandem solar cell by significantly reducing the surface roughness of the electrochemically deposited CZTSSe bottom cell.The surface roughness(R_(rms))of the CZTSSe thin film could be reduced from 424 to 86 nm by using the potentiostatic mode rather than using the conventional galvanostatic mode,which can be further reduced to 22 nm after the subsequent ion-milling process.The perovskite top cell with a bandgap of 1.65 eV could be prepared using a solution process on the flattened CZTSSe bottom cell,resulting in the efficient perovskite/CZTSSe tandem solar cells.After the current matching between two subcells involving the thickness control of the perovskite layer,the best performing tandem device exhibited a high conversion efficiency of 17.5%without the hysteresis effect. 展开更多
关键词 CZTSSe monolithic tandem solar cells PEROVSKITE solution process surface roughness control
下载PDF
Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells
6
作者 Devthade Vidyasagar Yeonghun Yun +13 位作者 Jae Yu Cho Hyemin Lee Kyung Won Kim Yong Tae Kim Sung Woong Yang Jina Jung Won Chang Choi Seonu Kim Rajendra Kumar Gunasekaran Seok Beom Kang Kwang Heo Dong Hoe Kim Jaeyeong Heo Sangwook Lee 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第1期317-326,I0008,共11页
Carbazole moiety-based 2PACz([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)self-assembled monolayers(SAMs)are excellent hole-selective contact(HSC)materials with abilities to excel the charge-transferdynamics of perovski... Carbazole moiety-based 2PACz([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)self-assembled monolayers(SAMs)are excellent hole-selective contact(HSC)materials with abilities to excel the charge-transferdynamics of perovskite solar cells(PSCs).Herein,we report a facile but powerful method to functionalize the surface of 2PACz-SAM,by which reproducible,highly stable,high-efficiency wide-bandgap PSCs can be obtained.The 2PACz surface treatment with various donor number solvents improves assembly of 2PACz-SAM and leave residual surface-bound solvent molecules on 2PACz-SAM,which increases perovskite grain size,retards halide segregation,and accelerates hole extraction.The surface functionalization achieves a high power conversion efficiency(PCE)of 17.62%for a single-junction wide-bandgap(~1.77 e V)PSC.We also demonstrate a monolithic all-perovskite tandem solar cell using surfaceengineered HSC,showing high PCE of 24.66%with large open-circuit voltage of 2.008 V and high fillfactor of 81.45%.Our results suggest this simple approach can further improve the tandem device,when coupled with a high-performance narrow-bandgap sub-cell. 展开更多
关键词 Perovskite solar cells 2PACz Monolithic tandem solar cells Wide bandgap
下载PDF
Efficient Monolithic Perovskite/Silicon Tandem Photovoltaics
7
作者 Yong Wang Yu Wang +1 位作者 Feng Gao Deren Yang 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第3期268-281,共14页
Tunable bandgaps make halide perovskites promising candidates for developing tandem solar cells(TSCs),a strategy to break the radiative limit of 33.7%for single-junction solar cells.Combining perovskites with market-d... Tunable bandgaps make halide perovskites promising candidates for developing tandem solar cells(TSCs),a strategy to break the radiative limit of 33.7%for single-junction solar cells.Combining perovskites with market-dominant crystalline silicon(c-Si)is particularly attractive;simple estimates based on the bandgap matching indicate that the efficiency limit in such tandem device is as high as 46%.However,state-of-the-art perovskite/c-Si TSCs only achieve an efficiency of~32.5%,implying significant challenges and also rich opportunities.In this review,we start with the operating mechanism and efficiency limit of TSCs,followed by systematical discussions on wide-bandgap perovskite front cells,interface selective contacts,and electrical interconnection layer,as well as photon management for highly efficient perovskite/c-Si TSCs.We highlight the challenges in this field and provide our understanding of future research directions toward highly efficient and stable large-scale wide-bandgap perovskite front cells for the commercialization of perovskite/c-Si TSCs. 展开更多
关键词 2-terminal electrical interconnection perovskite/silicon tandem photovoltaics photon management wide-bandgap perovskites
下载PDF
Non-destructive buffer enabling near-infrared-transparent inverted inorganic perovskite solar cells toward 1400 h light-soaking stable perovskite/Cu(In,Ga)Se_(2) tandem solar cells
8
作者 Yu Zhang Zhaoheng Tang +14 位作者 Zhongyang Zhang Jiahong Tang Minghua Li Siyuan Zhu Wenyan Tan Xi Jin Tongsheng Chen Jinsong Hu Chao Zhou Chunlei Yang Qijie Liang Xugang Guo Weimin Li Weiqiang Chen Yan Jiang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第10期622-629,I0013,共9页
Near-infrared(NIR)transparent inverted all-inorganic perovskite solar cells(PSCs)are excellent top cell candidates in tandem applications.An essential challenge is the replacement of metal contacts with transparent co... Near-infrared(NIR)transparent inverted all-inorganic perovskite solar cells(PSCs)are excellent top cell candidates in tandem applications.An essential challenge is the replacement of metal contacts with transparent conductive oxide(TCO)electrodes,which requires the introduction of a buffer layer to prevent sputtering damage.In this study,we show that the conventional buffers(i.e.,small organic molecules and atomic layer deposited metal oxides)used for organic-inorganic hybrid perovskites are not applicable to all-inorganic perovskites,due to non-uniform coverage of the vulnerable layers underneath,deterioration upon ion bombardment and moisture induced perovskite phase transition,A thin film of metal oxide nanoparticles by the spin-coating method serves as a non-destructive buffer layer for inorganic PSCs.All-inorganic inverted near-infrared-transparent PSCs deliver a PCE of 17.46%and an average transmittance of 73.7%between 780 and 1200 nm.In combination with an 18.56%Cu(In,Ga)Se_(2) bottom cell,we further demonstrate the first all-inorganic perovskite/CIGS 4-T tandem solar cell with a PCE of 24.75%,which exhibits excellent illumination stability by maintaining 86.7%of its initial efficiency after 1400 h.The non-destructive buffer lays the foundation for efficient and stable NIR-transparent inverted inorganic perovskite solar cells and perovskite-based tandems. 展开更多
关键词 CsPbI_(3)perovskite Inverted perovskite solar cells tandem solar cells Buffer layer Stability
下载PDF
Textured Perovskite/Silicon Tandem Solar Cells Achieving Over 30% Efficiency Promoted by 4-Fluorobenzylamine Hydroiodide
9
作者 Jingjing Liu Biao Shi +14 位作者 Qiaojing Xu Yucheng Li Yuxiang Li Pengfei Liu Zetong SunLi Xuejiao Wang Cong Sun Wei Han Diannan Li Sanlong Wang Dekun Zhang Guangwu Li Xiaona Du Ying Zhao Xiaodan Zhang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第9期557-570,共14页
Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion efficiency.However,it is challenging to ... Monolithic textured perovskite/silicon tandem solar cells(TSCs)are expected to achieve maximum light capture at the lowest cost,potentially exhibiting the best power conversion efficiency.However,it is challenging to fabricate high-quality perovskite films and preferred crystal orientation on commercially textured silicon substrates with micrometersize pyramids.Here,we introduced a bulky organic molecule(4-fluorobenzylamine hydroiodide(F-PMAI))as a perovskite additive.It is found that F-PMAI can retard the crystallization process of perovskite film through hydrogen bond interaction between F^(−)and FA^(+)and reduce(111)facet surface energy due to enhanced adsorption energy of F-PMAI on the(111)facet.Besides,the bulky molecular is extruded to the bottom and top of perovskite film after crystal growth,which can passivate interface defects through strong interaction between F-PMA+and undercoordinated Pb^(2+)/I^(−).As a result,the additive facilitates the formation of large perovskite grains and(111)preferred orientation with a reduced trap-state density,thereby promoting charge carrier transportation,and enhancing device performance and stability.The perovskite/silicon TSCs achieved a champion efficiency of 30.05%based on a silicon thin film tunneling junction.In addition,the devices exhibit excellent longterm thermal and light stability without encapsulation.This work provides an effective strategy for achieving efficient and stable TSCs. 展开更多
关键词 Perovskite crystallization (111)preferred orientation Defect passivation Perovskite/silicon tandem solar cells
下载PDF
Defect Engineering in Earth-Abundant Cu_(2)ZnSnSe_(4) Absorber Using Efficient Alkali Doping for Flexible and Tandem Solar Cell Applications
10
作者 Muhammad Rehan Ara Cho +11 位作者 Inyoung Jeong Kihwan Kim Asmat Ullah Jun-Sik Cho Joo Hyung Park Yunae Jo Sung Jun Hong Seung Kyu Ahn SeJin Ahn Jae Ho Yun Jihye Gwak Donghyeop Shin 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第2期249-256,共8页
To demonstrate flexible and tandem device applications,a low-temperature Cu_(2)ZnSnSe_(4)(CZTSe)deposition process,combined with efficient alkali doping,was developed.First,high-quality CZTSe films were grown at 480℃... To demonstrate flexible and tandem device applications,a low-temperature Cu_(2)ZnSnSe_(4)(CZTSe)deposition process,combined with efficient alkali doping,was developed.First,high-quality CZTSe films were grown at 480℃by a single co-evaporation,which is applicable to polyimide(PI)substrate.Because of the alkali-free substrate,Na and K alkali doping were systematically studied and optimized to precisely control the alkali distribution in CZTSe.The bulk defect density was significantly reduced by suppression of deep acceptor states after the(NaF+KF)PDTs.Through the low-temperature deposition with(NaF+KF)PDTs,the CZTSe device on glass yields the best efficiency of 8.1%with an improved Voc deficit of 646 mV.The developed deposition technologies have been applied to PI.For the first time,we report the highest efficiency of 6.92%for flexible CZTSe solar cells on PI.Additionally,CZTSe devices were utilized as bottom cells to fabricate four-terminal CZTSe/perovskite tandem cells because of a low bandgap of CZTSe(~1.0 eV)so that the tandem cell yielded an efficiency of 20%.The obtained results show that CZTSe solar cells prepared by a low-temperature process with in-situ alkali doping can be utilized for flexible thin-film solar cells as well as tandem device applications. 展开更多
关键词 alkali doping Earth-abundant Cu_(2)ZnSnSe_(4) flexible solar cells four-terminal tandem cells low-temperature process
下载PDF
Research on the Upper Limit of Accuracy for Predicting Theoretical Tandem Mass Spectrometry
11
作者 Changjiu He Xiaoyu Wang +1 位作者 Mingming Lyu Xinye Bian 《Journal of Computer and Communications》 2024年第3期184-195,共12页
In recent years, numerous theoretical tandem mass spectrometry prediction methods have been proposed, yet a systematic study and evaluation of their theoretical accuracy limits have not been conducted. If the accuracy... In recent years, numerous theoretical tandem mass spectrometry prediction methods have been proposed, yet a systematic study and evaluation of their theoretical accuracy limits have not been conducted. If the accuracy of current methods approaches this limit, further exploration of new prediction techniques may become redundant. Conversely, a need for more precise prediction methods or models may be indicated. In this study, we have experimentally analyzed the limits of accuracy at different numbers of ions and parameters using repeated spectral pairs and integrating various similarity metrics. Results show significant achievements in accuracy for backbone ion methods with room for improvement. In contrast, full-spectrum prediction methods exhibit greater potential relative to the theoretical accuracy limit. Additionally, findings highlight the significant impact of normalized collision energy and instrument type on prediction accuracy, underscoring the importance of considering these factors in future theoretical tandem mass spectrometry predictions. 展开更多
关键词 tandem Mass Spectrometry Spectral Prediction Theoretical Limit
下载PDF
DNA Tandem Repeats as Iterable Objects to Count Cell Divisions: A Computational Model
12
作者 Marco Franco Giulio Regolini 《Advances in Bioscience and Biotechnology》 CAS 2024年第4期207-234,共28页
Cell lineages of nematodes are completely known: the adult male of Caenorhabditis elegans contains 1031 somatic cells, the hermaphrodite 959, not one more, not one less;cell divisions are strictly deterministic (as in... Cell lineages of nematodes are completely known: the adult male of Caenorhabditis elegans contains 1031 somatic cells, the hermaphrodite 959, not one more, not one less;cell divisions are strictly deterministic (as in the great majority of invertebrates) but so far nothing is known about the mechanism used by cells to count precise numbers of divisions. In vertebrates, each species has its invariable deterministic numbers of somites, vertebrae, fingers, and teeth: counting the number of iterations is a widespread process in living beings;nonetheless, it remains an unanswered question and a great challenge in cell biology. This paper introduces a computational model to investigate the possible role of satellite DNA in counting cell divisions, showing how cells may operate under Boolean logic algebra. Satellite DNA, made up of repeated monomers and subject to high epigenetic methylation rates, is very similar to iterable sequences used in programming: just like in the “iteration protocol” of algorithms, the epigenetic machinery may run over linear tandem repeats (that hold cell-fate data), read and orderly mark one monomer per cell-cycle (cytosine methylation), keep track and transmit marks to descendant cells, sending information to cell-cycle regulators. 展开更多
关键词 Satellite DNA tandem-Repeats EPIGENETICS
下载PDF
TerraSAR-X/TanDEM-X雷达遥感计划及其应用 被引量:28
13
作者 廖明生 田馨 赵卿 《测绘信息与工程》 2007年第2期44-46,共3页
介绍了德国航天局即将发射的TerraSAR-X雷达卫星遥感计划和将要在近期实施的TanDEM-X雷达遥感计划,分析了该计划的工作模式和应用。
关键词 合成孔径雷达 合成孔径雷达干涉测量 TerraSAR—X卫星 tandem—X卫星计划
下载PDF
利用TanDEM-X生成DEM的精度评定 被引量:5
14
作者 杨亚夫 朱建军 许兵 《测绘通报》 CSCD 北大核心 2017年第7期18-22,75,共6页
目前,许多学者对TanDEM-X生成DEM开展了一些研究,其研究成果也显示了TanDEM-X生成高精度DEM的可行性。为了验证TanDEM-X/Terra SAR-X干涉生成的DEM能否满足测图要求,需要对其进行精度评价和分析。相对于C波段的ERS、ASAR和L波段的ALOS,... 目前,许多学者对TanDEM-X生成DEM开展了一些研究,其研究成果也显示了TanDEM-X生成高精度DEM的可行性。为了验证TanDEM-X/Terra SAR-X干涉生成的DEM能否满足测图要求,需要对其进行精度评价和分析。相对于C波段的ERS、ASAR和L波段的ALOS,X波段的高分辨率Terra SAR影像干涉条纹更密集,解缠更加困难。针对这一问题,本文设计了一种低分辨率SRTM辅助高分辨率的X波段的Terra SAR干涉相位解缠方案,提高了解缠的效率和精度。同时,本文提出了一种基于协方差函数的方法对TDX/TSX DEM进行精度分析和评价。该方法通过对各个距离上的协方差值进行拟合,消除了高程误差异常对In SAR DEM精度评价的影响,可以更加客观真实地反映DEM的精度。实例分析结果表明:采用协方差函数方法来评价DEM的精度是可行的,对于试验研究区域,TDX/TSX干涉生成的DEM总体精度为1.42 m,能够满足1∶10 000测图要求,为我国空白地区的测图提供了有利条件。 展开更多
关键词 tandem—X 数字高程模型 干涉合成孔径雷达 相位解缠 协方差函数
下载PDF
TanDEM-X极化干涉SAR森林冠层高度反演 被引量:5
15
作者 章皖秋 岳彩荣 颜培东 《东北林业大学学报》 CAS CSCD 北大核心 2017年第1期47-54,共8页
森林树高是反映森林蓄积量、生物量、碳储量和立地质量的关键指标。极化干涉SAR技术是森林树高估测的有效手段之一,但数据获取及数据质量一直是极化干涉SAR树高反演研究的主要制约因素。以云南省勐腊县为实验区,基于德国DLR提供的双站模... 森林树高是反映森林蓄积量、生物量、碳储量和立地质量的关键指标。极化干涉SAR技术是森林树高估测的有效手段之一,但数据获取及数据质量一直是极化干涉SAR树高反演研究的主要制约因素。以云南省勐腊县为实验区,基于德国DLR提供的双站模式Tan DEM-X Co SSC全极化干涉数据,采用三阶段算法、以及两种结合极化干涉优化的相位差分-相干幅度法反演了实验区的森林冠层高度。结果表明:三阶段算法的反演结果数值相对合理,与二类调查数据的空间分布格局相似;相位差分-相干幅度法的反演结果在林区出现部分负值,而在非林区却反演出冠层高度、且呈现条纹状,反演结果与二类调查数据的空间分布差异较大、相关性低。因此,三阶段算法结合双站模式的Tan DEM-X全极化干涉数据,能够在实际树高估测反演中发挥作用,为辅助森林资源调查工作提供了新手段。 展开更多
关键词 TAN DEM-X 极化干涉SAR 森林冠层高
下载PDF
TerraSAR-X/TanDEM-X获取高精度数字高程模型技术研究 被引量:29
16
作者 杜亚男 冯光财 +2 位作者 李志伟 朱建军 彭星 《地球物理学报》 SCIE EI CSCD 北大核心 2015年第9期3089-3102,共14页
以双星系统(TerraSAR-X/TanDEM-X)下的bistatic数据模式为例研究了差分干涉获取高精度DEM产品的融合算法和技术流程.针对不同观测几何条件下(升降轨,不同入射角)观测数据的畸变和缺失,提出一种迭代的顾及垂直基线、阴影和叠影的数... 以双星系统(TerraSAR-X/TanDEM-X)下的bistatic数据模式为例研究了差分干涉获取高精度DEM产品的融合算法和技术流程.针对不同观测几何条件下(升降轨,不同入射角)观测数据的畸变和缺失,提出一种迭代的顾及垂直基线、阴影和叠影的数据融合新方法重建高分辨率高精度的数字高程模型,并对TanDEM-X融合的DEM在不同地物属性特征下(山区及高楼林立的城区)的精度进行定量分析.本文采用了两对覆盖珠海、澳门区域的升降轨TerraSAR-X/TanDEM-X干涉对进行融合处理,并通过收集的高精度Lidar数据进行精度比较分析.此外,本文还定量分析了TanDEM-X的DEM对常规DInSAR技术的改进,并与SRTM、ASTER的结果进行对比.结果表明:提出的升降轨融合方法较单一轨道平台能够较好地改正或减弱由于几何畸变引起的高程信息缺失或错误,通过与Lidar数据的对比发现TanDEM-X的融合DEM在山区的精度较高,其残差的标准差为3.5 m,较单一轨道(升、降轨)分别降低8%和22%,能够通过迭代的方法获取高分辨率(可达2~5m)、高精度的地形信息;而针对城区密集建筑物的复杂地形来说,融合的DEM的精度稍低,残差的标准差为11.8m,但较单一轨道(升、降轨)来说有较大改进,其残差标准差分别降低了28%和22%;而在分布较为稀疏的居民区,融合的DEM能够较Lidar数据获取更好的建筑物高度及外形信息,此时的残差标准差可达5m.同时,TanDEM-X的融合DEM作为外部DEM能够较SRTM和ASTER来说更好地去除地形信息,尤其在山区及高程建筑密集分布的城区,从而利于后续的相位解缠和形变信息的精确获取和解译,为更高精度的时序InSAR形变监测提供有利条件。 展开更多
关键词 数字高程模型 TerraSAR-X/tandem-X 几何畸变 升降轨融合
下载PDF
Tandem repeat查找方法比较
17
作者 徐恒宇 王镝 +1 位作者 王国仁 郑若石 《计算机科学》 CSCD 北大核心 2005年第10期172-175,192,共5页
Tandemrepeat在基因组成和进化中起到非常重要的作用,查找和分析Tandemrepeat已经成为当前生物信息学的一个前沿领域和研究焦点。目前在这一研究领域存在多类解决方法,主要有基于LZ分解技术的方法和最近兴起的基于后缀树索引的方法。本... Tandemrepeat在基因组成和进化中起到非常重要的作用,查找和分析Tandemrepeat已经成为当前生物信息学的一个前沿领域和研究焦点。目前在这一研究领域存在多类解决方法,主要有基于LZ分解技术的方法和最近兴起的基于后缀树索引的方法。本文选取了两种时间复杂度达到O(nlogn)数量级的代表性的方法,对这两种方法进行了全面的综述,并对它们的性能进行了系统的比较和分析。 展开更多
关键词 tandem REPEAT LZ分解 后缀树 生物信息学 时间复杂度 基因组成 分解技术 数量级 后缀树
下载PDF
基于TerraSAR-X/TanDEM-X干涉DEM的森林冠层高度估测 被引量:1
18
作者 章皖秋 岳彩荣 刘晓英 《西南林业大学学报(自然科学)》 CAS 北大核心 2016年第6期64-72,共9页
森林树高的大面积估测一直是森林资源调查和林业遥感所面临的技术难题。以云南省勐腊县森林资源为研究对象,将DEM差分法与TerraSAR-X/TanDEM-X全极化干涉数据、地形图相结合,用TerraSAR-X/TanDEM-X数据干涉生成各极化通道带有森林冠层... 森林树高的大面积估测一直是森林资源调查和林业遥感所面临的技术难题。以云南省勐腊县森林资源为研究对象,将DEM差分法与TerraSAR-X/TanDEM-X全极化干涉数据、地形图相结合,用TerraSAR-X/TanDEM-X数据干涉生成各极化通道带有森林冠层高度的DSM,从地形图上提取地表高度DTM;对2个高度模型进行水平位置匹配,并提出用参考面将DSM与DTM转换为相对高度模型RDSM和RDTM,以消除高程基准差异;最后对RDSM和RDTM进行差分运算,估测出研究区各极化通道下的森林冠层高度分布。采用森林资源二类调查数据,对各极化通道的冠层估测高进行了合理性验证。研究表明:DTM的高程基准面低于DSM,平坦农地适合作为参考面提取相对高度模型。在小班尺度上与森林资源二类调查数据的对比显示:各极化通道的冠层估测高与小班林分高均呈显著的中等正相关,冠层高度估测值大小合理,人工林的估测结果略优于天然林;人工林与天然林的冠层估测结果均在主要坡度分布区间内与小班林分高的相关性高;各极化通道的估测结果整体上没有明显差异。从总体上来看,基于地形图和TerraSAR-X/TanDEM-X数据,利用DEM差分法来大面积估测森林冠层高度是一种有效可行的途径,为辅助森林资源调查工作提供了新思路。 展开更多
关键词 干涉 DEM差分 冠层高度 森林
下载PDF
Tri-Arc与Tandem双丝电弧焊的工作原理对比分析 被引量:2
19
作者 耿正 李少农 +2 位作者 魏占静 王巍 邱光 《精密成形工程》 2020年第4期107-111,共5页
目的介绍一种称为Tri-Arc的新型双丝电弧焊接方法。方法将Tri-Arc双丝电弧焊与应用较广的Tandem双丝电弧焊的系统构成和焊接电流波形进行对比分析。结果Tri-Arc和Tandem两种双丝电弧焊接方法所使用的双丝焊枪相近,双电源相位同步控制和... 目的介绍一种称为Tri-Arc的新型双丝电弧焊接方法。方法将Tri-Arc双丝电弧焊与应用较广的Tandem双丝电弧焊的系统构成和焊接电流波形进行对比分析。结果Tri-Arc和Tandem两种双丝电弧焊接方法所使用的双丝焊枪相近,双电源相位同步控制和U/I脉冲控制方式类似。Tri-Arc和Tandem两种双丝电弧焊接方法的差异在于:Tandem双丝电弧焊的2个电弧是相对独立的,而Tri-Arc双丝电弧焊的2个电弧是相互耦合的,因此Tri-Arc双丝电弧焊又具有旁路耦合电弧的某些特点。结论这种新型的Tri-Arc双丝电弧焊不仅具有与Tandem双丝电弧焊一样的高焊丝熔敷率,而且具有比Tandem双丝电弧焊更低的焊接热输入。 展开更多
关键词 Tri-Arc双丝焊 tandem双丝焊 高焊丝熔敷率 低焊接热输入
下载PDF
液相色谱-串联质谱法在双壳贝类麻痹性贝毒检测中的应用及影响因素研究进展
20
作者 邓宇翔 吴海燕 +3 位作者 徐希震 赵辉辉 谭志军 郑关超 《食品科学》 EI CAS 北大核心 2025年第1期218-226,共9页
麻痹性贝毒(paralytic shellfish poison,PSP)是危害最大、分布最广的海洋生物毒素,给人类健康、渔业经济及海洋环境带来巨大威胁。双壳贝类是消费者摄入PSP的主要来源,随着PSP中毒事件频发,全球对双壳贝类中PSP检测技术的要求越来越高... 麻痹性贝毒(paralytic shellfish poison,PSP)是危害最大、分布最广的海洋生物毒素,给人类健康、渔业经济及海洋环境带来巨大威胁。双壳贝类是消费者摄入PSP的主要来源,随着PSP中毒事件频发,全球对双壳贝类中PSP检测技术的要求越来越高。本文首先介绍PSP理化性质,其次从前处理提取净化、仪器条件、基质效应、方法验证方面对液相色谱-串联质谱(liquid chromatography-tandem mass spectrometry,LC-MS/MS)法在双壳贝类中PSP检测中的优劣势进行总结,经对比分析发现,目前1%乙酸已成为LC-MS/MS检测技术中最常用的PSP提取试剂,石墨化炭黑填料和亲水相互作用液相色谱分别更适用于净化、分离双壳贝类中PSP提取物,影响基质效应的因素主要为内源性干扰如磷脂、蛋白质等,外源性干扰如检测方法中有机物和聚合物残留等杂质。本文重点分析LC-MS/MS研究发展趋势,以期为双壳贝类中PSP的检测提供参考,也为贝类养殖产业绿色发展及政府监管提供技术支持。 展开更多
关键词 麻痹性贝毒 双壳贝类 液相色谱-串联质谱法 影响因素
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部