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| 1 | Densely nested top-down flows for salient object detection显示文摘With the goal of identifying pixel-wise salient object regions from each input image,salient object detection(SOD)has been receiving great attention in recent years.One kind of mainstream SOD method is formed by a bottom-up feature encoding procedure and a top-down information decoding procedure.While numerous approaches have explored the bottom-up feature extraction for this task,the design of top-down flows remains under-studied.To this end,this paper revisits the role of top-down modeling in salient object detection and designs a novel densely nested top-down flows(DNTDF)-based framework.In every stage of DNTDF,features from higher levels are read in via the progressive compression shortcut paths(PCSPs).The notable characteristics of our proposed method are as follows.(1)The propagation of high-level features which usually have relatively strong semantic information is enhanced in the decoding procedure.(2)With the help of PCSP,the gradient vanishing issues caused by non-linear operations in top-down information flows can be alleviated.(3)Thanks to the full exploration of high-level features,the decoding process of our method is relatively memory-efficient compared to those of existing methods.Integrating DNTDF with EfficientN et,we construct a highly light-weighted SOD model,with very low computational complexity.To demonstrate the effectiveness of the proposed model,comprehensive experiments are conducted on six widely-used benchmark datasets.The comparisons to the most state-of-the-art methods as well as the carefully-designed baseline models verify our insights on the top-down flow modeling for SOD. | Chaowei FANG Haibin TIAN Dingwen ZHANG Qiang ZHANG Jungong HAN Junwei HAN | 2022 | Science China(Information Sciences)2022，65，8： | 1 |
| 2 | An Organic–Inorganic Hybrid Material Based on Benzo[ghi]perylenetri-imide and Cyclic Titanium-Oxo Cluster for Efficient Perovskite and Organic Solar Cells显示文摘Perovskite and organic solar cells usually require electron-transport interlayers to efficiently transport electrons from the photoactive layer to the metal electrode.In general,pure organic or inorganic materials are applied into the interlayers,but organic–inorganic hybrid materials have been rarely reported for this application.In this work,we report using the first titanium-oxo cluster-based organic–inorganic hybrid as the interlayer material by introducing largeπ-conjugated benzo[ghi]perylenetriimides as an organic part via a simple ligand-exchange reaction.This new hybrid material showed excellent solubility,well-aligned energy levels,and excellent electron mobilities,enabling its great potential application as an interlayer in solar cells such as perovskite and organic solar cells,providing high power conversion efficiencies of>20%and 16%,respectively.Therefore,we claim that our present work introduces a new class of cluster-based organic–inorganic hybrid interlayer materials that exhibit promising application in organic electronics. | Zhou Zhang Faming Han Jie Fang Chaowei Zhao Shuai Li Yonggang Wu Yuefeng Zhang Shengyong You Binghui Wu Weiwei Li | 2022 | CCS Chemistry2022，4，3： | 1 |
| 3 | Direct incorporation of paraffin wax as phase change material into mass concrete for temperature control: mechanical and thermal properties显示文摘Taking advantage of heat absorbing and releasing capability of phase change material(PCM),Paraffin wax-based concrete was prepared to assess its automatic temperature control performance.The mechanical properties of PCM concrete with eight different Paraffin wax contents were tested by the cube compression test and four-point bending test.The more Paraffin wax incorporated,the greater loss of the compressive strength and bending strength.Based on the mechanical results,four contents of Paraffin wax were chosen for studying PCM concrete's thermal properties,including thermal conductivity,thermal diffusivity,specific heat capacity,thermal expansion coefficient and adiabatic temperature rise.When the Paraffin wax content increases from 10%to 20%,the thermal conductivity and the thermal diffusivity decrease from 7.31 kJ/(m·h·°C)to 7.10 kJ/(m·h·°C)and from 3.03×10−3 m2/h to 2.44×10−3 m2/h,respectively.Meanwhile the specific heat capacity and thermal expansion coefficient rise from 5.38×10−1 kJ/(kg·°C)to 5.76×10−1 kJ/(kg·°C)and from 9.63×10−6/°C to 14.02×10−6/°C,respectively.The adiabatic temperature rise is found to decrease with an increasing Paraffin wax content.Considering both the mechanical and thermal properties,15%of Paraffin wax was elected for the mass concrete model test,and the model test results confirm the effect of Paraffin wax in automatic mass concrete temperature control. | Tao Luo JuanJuan Ma Fang Liu MingYi Zhang ChaoWei Sun YanJun Ji XiaoSa Yuan | 2021 | Research in Cold and Arid Regions2021，13，1： | 0 |
| 4 | Stable Radical TEMPO Terminated Perylene Bisimide(PBI) Based Small Molecule as Cathode Interlayer for Efficient Organic Solar Cells显示文摘By combining stable radical tetramethylpiperidine nitrogen oxide(TEMPO)as end groups and perylene bisimide(PBI)as the core,a small molecular cathode interlayer(CIL)(PBI-TEMPO)was synthesized.Detailed physical-chemical characterizations indicate that PBI-TEMPO can form smooth film,owns low unoccupied molecular orbital(LUMO)level of−3.67 eV and can reduce the work function of silver electrode.When using PBI-TEMPO as CIL in non-fullerene organic solar cells(OSCs),the PM6:BTP-4Cl based OSCs delivered high power conversion efficiencies(PCEs)up to 17.37%,higher than those using commercial PDINO CIL with PCEs of 16.95%.Further device characterizations indicate that PBI-TEMPO can facilitate more efficient exciton dissociation and reduce charge recombination,resulting in enhanced current density and fill factor.Moreover,PBI-TEMPO displays higher thermal stability than PDINO in solution.When PBI-TEMPO and PDINO solution were heated at 150℃ for 2 h and then were used as CIL in solar cells,PBI-TEMPO-based OSCs provided a PCE of 15%,while PDINO-based OSCs only showed a PCE of 10%.These results demonstrate that incorporating TEMPO into conjugated materials is a useful strategy to create new organic semiconductors for application in OSCs. | ZHANG Ziwei XIA Dongdong XIE Qian ZHAO Chaowei FANG Jie WU Yonggang LI Weiwei | 2023 | Chemical Research in Chinese Universities2023，39，2： | 0 |
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