检索结果-南通市图书馆

Deep learning-based open API recommendation for Mashup development

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2023年第7期66卷 94-111页

作者： Ye WANG junwu chen Qiao HUANG Xin XIA Bo JIANG School of Computer and Information Engineering Zhejiang Gongshang University Software Engineering Application Technology Lab

Mashup developers often need to find open application programming interfaces(APIs) for their composition application development. Although most enterprises and service organizations have encapsulated their businesses or resources online as open APIs, finding the right high-quality open APIs is not an easy task from a library with several open APIs. To solve this problem, this paper proposes a deep learning-based open API recommendation(DLOAR) approach. First, the hierarchical density-based spatial clustering of applications with a noise topic model is constructed to build topic models for Mashup clusters. Second,developers’ requirement keywords are extracted by the Text Rank algorithm, and the language model is built. Third, a neural network-based three-level similarity calculation is performed to find the most relevant open APIs. Finally, we complement the relevant information of open APIs in the recommended list to help developers make better choices. We evaluate the DLOAR approach on a real dataset and compare it with commonly used open API recommendation approaches: term frequency-inverse document frequency, latent dirichlet allocation, Word2Vec, and Sentence-BERT. The results show that the DLOAR approach has better performance than the other approaches in terms of precision, recall, F1-measure, mean average precision,and mean reciprocal rank.

关键词： Mashup development open API recommendation deep learning neural network service discovery

Small molecular non-fullerene electron acceptors for P3HT-based bulk-heterojunction solar cells

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2014年第7期57卷 973-981页

作者： LIU Xin CAI Ping chen Dongchen chen junwu SU ShiJian CAO Yong State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials & Devices South China University of Technology

Three small molecules with the same arms and different cores of perylene diimide(PDI)or indaceno[2,1-b:6,5-b']dithiophene(IDT)were designed and synthesized as the acceptor materials for P3HT-based bulk-heterojunction(BHJ)solar *** impacts of the different cores on the optical absorption,electrochemical properties,electron mobility,film morphology,photoluminescene characteristics,and solar cell performance were thoroughly *** three compounds possess a broad absorption covering the wavelength range of 400–700 nm and relatively low lowest unoccupied molecular orbital(LUMO)energy levels of?3.86,?3.81 and?3.99 *** highest power conversion efficiency of 0.82%was achieved for the BHJ solar cells based on SM3 as the acceptor material,the compound with a PDI core.

关键词： bulk-heterojunction solar cells electron acceptor non-fullerene n-type materials low band gap

Replacing alkyl side chain of non-fullerene acceptor with siloxane-terminated side chain enables lower surface energy towards optimizing bulk-heterojunction morphology and high photovoltaic performance

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2021年第7期64卷 1208-1218页

作者： Rihang Qiu Zhuhao Wu Suhan Li Haiying Jiang Qian Wang Yinchu chen Xuanchen Liu Lianjie Zhang junwu chen State Key Laboratory of Luminescent Materials&Devices Institute of Polymer Optoelectronic Materials&DevicesGuangzhou 510640China South China University of Technology South China Institute of Collaborative InnovationDongguan 523808China

Towards a good control of the morphology of bulk-heterojunction(BHJ)active layers for polymer solar cells(PSCs),selecting an appropriate side chain for a polymer donor and a nonfullerene acceptor(NFA)is very *** this work,two novel NFAs i-IE-4F and i-IESi-4 F comprising alkyl and siloxane-terminated side chains on the central indacenodithiophene(IDT)core,respectively,were *** the siloxane-terminated side chain to i-IESi-4 F affords surface energy(γ)of33.32 mN/m,much lower than that of 39.83 mN/m for i-IE-4F,supplying a big chance to tune miscibility with a polymer *** fluorobenzotriazole-based polymer donors J52 and PBZ-2Si bearing alkyl and siloxane-terminated side chains,respectively,showγvalues of 36.08 and 33.10 mN/m,*** estimated Flory-Huggins interaction parameters(χD,A)indicate that the i-IESi-4 F is more miscible than i-IE-4F in pairing with J52 or *** resulting i-IESi-4 F-based blend film exhibits low film roughness and accompanies obviously improved BHJ *** PSCs,the J52:i-IESi-4F and PBZ-2Si:i-IESi-4 F active layers display power conversion efficiencies(PCEs)of 12.67%and 14.54%,respectively,all remarkably higher than PCEs≤7.34%of the i-IE-4F-based active ***,the PBZ-2Si:i-IESi-4 F active layer,a donor:acceptor blend system comprising siloxane-terminated side chains(DSi:ASimatching)with the highest BHJ miscibility due to the combinatory effect of the side chains,shows the highest efficiency,as supported by efficient exciton dissociation,the lowest bimolecular recombination,and the optimal charge *** results demonstrate that attaching siloxane-terminated side chains to NFAs,as a side chain engineering,has big potential in lowering their surface energy towards fine control of BHJ morphology and leading to a better donor:acceptor blend system.

关键词： terminated acceptor donor

苯基取代苯并二噻吩二酮构建新型聚合物及其光伏性能研究

在线全文

学校读者我要写书评

暂无评论

化学学报 2024年第3期82卷 257-264页

作者：邓燧楠刘海珍张连杰罗文君罗妹张泽升梁嘉豪王新康陈军武华南理工大学高分子光电材料与器件研究所发光材料与器件国家重点实验室广州510640

随着材料和器件的不断发展,有机光伏(OPV)的器件效率不断提升,但制备仍存在较多额外加工工艺,不利于其大规模生产.如何合理调控活性层材料的溶解性、结晶性和两相形貌来简化器件制备工艺,实现高性能的as-cast器件将十分具有科学意义.本... 详细信息

随着材料和器件的不断发展,有机光伏(OPV)的器件效率不断提升,但制备仍存在较多额外加工工艺,不利于其大规模生产.如何合理调控活性层材料的溶解性、结晶性和两相形貌来简化器件制备工艺,实现高性能的as-cast器件将十分具有科学意义.本工作通过设计合成苯基取代的苯并二噻吩二酮单元(二维BDD)作为共聚单元,制备了三种新型聚合物材料.当二维BDD单元摩尔分数为10%时, FBDT-m10能实现良好的聚集性能和加工性能,与Y6-BO共混制备的as-cast器件就可以得到良好的活性层形貌,最终实现了71.14%的填充因子及16.06%的器件效率.

关键词：芳香取代苯并二噻吩二酮聚合物给体有机太阳电池

Design, synthesis and photovoltaic properties of a series of new acceptor-pended conjugated polymers

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2016年第12期59卷 1583-1592页

作者： Zhihong Wu Yongxiang Zhu Wei Li Yunping Huang junwu chen Chunhui Duan Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

A series of novel acceptor-pended conjugated polymers featuring a newly developed carbazole-derived unit are designed and synthesized. The relationships between chemical structure and optoelectronic properties of the polymers are systematically in-vestigated. The control of UV-Vis absorption spectra and energy levels in resulting polymers are achieved by introducing suitable pended acceptor units. The photovoltaic properties of the resulting polymers are evaluated by blending the polymers with （6,6）-phenyl-CTFbutyric acid methyl ester. The resulting solar cells exhibit moderate performances with high open-circuit voltage. Charge transport properties and morphology were investigated to understand the performance of corresponding solar cells.

关键词： acceptor.pended conjugated polymers polymer solar cells band gap energy level

Low band-gap benzodithiophene-thienothiophenecopolymers: the effect of dual two-dimensional substitutions on optoelectronic properties

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第2期58卷 267-275页

作者： Zhulin Liu Jiangman Sun Yongxiang Zhu Peng Liu Lianjie Zhang junwu chen Fei Huang Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

Two new conjugated copolymers, PBDT-T6-TTF and PBDT-T12-TTF, were derived from a novel 4-fluorobenzoyl thienothi- ophene （TTF）. In addition, two types of benzodithiophene （BDT） units with 2,3-dihexylthienyl （T6） and 2,3-didodecylthienyl （T12） substituents, respectively, were successfully synthesized. The effect of the dual two-dimensional （2D） substitutions of the building blocks upon the optoelectronic properties of the polymers was investigated. Generally, the two polymers exhibited good solubility and broad absorption, showing similar optical band gaps of ~1.53 eV. However, PBDT-T6-TTF with its shorter alkyl chain length possessed a larger extinction coefficient in thin solid film. The highest occupied molecular orbital （HOMO） level of PBDT-T6-TTF was located at -5.38 eV while that of PBDT-T12-TTF was at -5.51 eV. In space charge-limited- current （SCLC） measurement, PBDT-T6-TTF and PBDT-T12-TTF displayed respective hole mobilities of 3.0~10-~ and 1.6x10 5 cm2 V-1 s-l. In polymer solar cells, PBDT-T6-TTF and PBDT-T12-TTF showed respective power conversion efficiencies （PCEs） of 2.86% and 1.67%. When 1,8-diiodooctane （DIO） was used as the solvent additive, the PCE of PBDT-T6-TTF was remarkably elevated to 4.85%, but the use of DIO for the PBDT-T12-TTF-blend film resulted in a lower PCE of 0.91%. Atomic force microscopy （AFM） indicated that the superior efficiency of PBDT-T6-TTF with 3% DIO （v/v） should be related to the better continuous phase separation of the blend film. Nevertheless, the morphology of the PBDT-T12-TTF deteriorated when the 3% DIO （v/v） was added. Our results suggest that the alkyl-chain length on the 2D BDT units play an important role in determining the optoelectronic properties of dual 2D BDT-TT-based polymers.

关键词： conjugated copolymers benzodithiophene thienothiophene dual 2-dimentional substitutions alkyl side-chain length

Optimized Combination of Residue Hydrodesulfurization and Residue Fluid Catalytic Cracking

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2003年第1期5卷 13-17页

作者： chen junwu(Luoyang Petrochemical Engineering Company ,Luoyang 471003) Luoyang Petrochem. Eng. Company Luoyang 471003 China

Combination of residue hydrodesulfurization (HDS) and residue fluid catalyticcracking (RFCC) is a unique technology for processing high-sulfur residue. This paper discusses theoptimized combination of these two proces... 详细信息

关键词：加氢脱硫渣油催化裂化生产工艺优化

Silaindacenodithiophene-Based Fused-Ring Non-Fullerene Electron Acceptor for Efficient Polymer Solar Cells

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2018年第6期36卷 495-501页

作者： Yaowen Nian Zhen Wang Haiying Jiang Shizhen Feng Suhan Li Lianjie Zhang Yong Cao junwu chen Optoelectronic Materials &. Devices State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou Guangdong 510640 China

In this work, a new A-D-A type nonfuUerene small molecular acceptor SilDT-IC, with a fused-ring silaindacenodithiophene （SilDT） as D unit and 2-（3-oxo-2,3-dihydroinden-l-ylidene）malononitrile （INCN） as the end A unit, was design and synthesized. The SilDT-IC film shows absorption peak and edge at 695 and 733 nm, respectively. The HOMO and LUMO of SilDT-IC are of -5.47 and -3.78 eV, respectively. Compared with carbon-bridging, the Si-bridging can result in an upper-lying LUMO level of an acceptor, which is benefit to achieve a higher open-circuit voltage in polymer solar cells （PSCs）. Complementary absorption and suitable energy level alignment between SilDT-IC and wide bandgap polymer donor PBDB-T were found. For the PBDB-T：SilDT-IC based inverted PSCs, a D/A ratio of 1 ： 1 was optimal to achieve a power conversion efficiency （PCE） of 7.27%. With thermal annealing （TA） of the blend film, a higher PCE of 8.16% could be realized due to increasing of both short-circuit current density and fill factor. After the TA treatment, hole and electron mobilities were elevated to 3.42 × 10-4 and 1.02 × 10-4 cm2·V-1.s-1, respectively. The results suggest that the SilDT, a Si-bridged fused ring, is a valuable D unit to construct efficient nonfullerene acceptors for PSCs.

关键词： polymer solar cells nonfullerene accepter silaindacenodithiophene thermal annealing

Robust superamphiphobic coatings with gradient and hierarchical architecture and excellent anti-flashover performances

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2022年第8期15卷 7565-7576页

作者： Yi Xie Wei Xiong Shefiu Kareem Chuxiong Qiu Yongfei Hu Ivan PParkin Shengwu Wang Huayun Wang junwu chen Lee Li Zhi chen Huajun Sun Xiujian Zhao State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Department of Chemistry University College LondonLondon WC1H 0AJUK State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science&Technology) Wuhan 430074China State Grid Jiangxi Electric Power CompanyLtd.Electric Power Research InstituteNanchang 330096China Wuhan Shuneng New Material Co. LTDWuhan 430074China

Biomimetic superhydrophobic(SH)coatings have emerged as a promising alternative to traditional room temperature vulcanizing(RTV)silicone rubber coatings for improving the flashover strength of ***,organic contamination occurs in outdoor applications and thus a superamphiphobic(SAP)surface is more desirable but not yet reported for improving flashover ***,we developed a novel anti-flashover technique by fabricating robust SAP coating with unique gradient and micro-nanoscale hierarchical *** SAP coating was fabricated by sequentially spray-depositing a resin-based primer and a silica-based topcoat on substrates(i.e.,glass slides and insulators).The primer not only functions as an adhesive offering strong adhesion to the substrate but also offers a micromastoid-like structure facilitating the subsequent formation of hierarchical *** appropriate spraying pressure leads to a diffusion of the fluorocarbon-modified silica nanoparticles into the primer to form a unique gradient structure,by analogy to inserting bullets into a *** features render the SAP coating excellent robustness with strong abrasive resistance,excellent ultraviolet(UV)resistance,and excellent chemical and thermal *** flashover property of the SAP coating was explored and compared with that of SH and RTV specimens,from which a novel organic-contamination model to evaluate the flashover performance was *** coated SAP glass insulator demonstrated 42.9%pollution flashover voltage improvement than RTV-coated *** stated unique features reveal the convincing potential of the present SAP coatings to be applied for not only outdoor transmission line insulators for antiflashover but also other fields for self-cleaning,anti-fouling,and anti-icing.

关键词： superamphiphobic coatings superhydrophobic coatings insulator pollution flashover voltage anti-flashover