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Plasmonic CsPbBr_(3)–Au nanocomposite for excitation wavelength dependent photocatalytic CO_(2) reduction

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Journal of Energy Chemistry 2021年第2期30卷 309-315,I0011页

作者： Jin-feng liao Ya-Ting Cai Jun-Yan Li yong Jiang Xu-Dong Wang Hong-Yan Chea Dai-Bin Kuang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional MaterialsSchool of ChemistrySun Yat-sen UniversityGuangzhou 510217GuangdongChina

The optoelectronic performance of CsPbBr_3 nanocrystal(NC) has been dramatically limited by the severe charge carrier recombination and its narrow light absorption range,which are anticipated to be resolved via coupling with plasmonic Au nanoparticle(NP).In view of this,CsPbBr_3-Au nanocomposite is fabricated and further employed as a concept model to study the electronic interaction between perovskite NC and Au NP for the first *** has been found that the excitation-wavelength dependent carrier transfer behavior exists in CsPbBr_3-Au *** illumination with visible light(λ>420 nm),photo-generated electrons in CsPbBr_3 can inject into Au with an electron injection rate and efficiency of 2.84×10~9 s^(-1) and 78%,*** boosted charge separation is further translated into a 3.2-fold enhancement in CO_2 photocatalytic reduction activity compared with pristine CsPbBr_*** the other hand,when solely exciting Au NP with longer wavelength light(λ>580 nm),the localized surface plasmon resonance(LSPR) induced hot electrons in Au NPs can transfer to CsPbBr_3 NC and further participate in photocatalytic reaction towards CO_2 *** present study provides new insights into preparing plasmonic nanostructure to enhance the performance of perovskite based optoelectronic devices.

关键词： Perovskite Gold nanoparticle Photocatalysis Localized surface plasmon resonance

Long-term adaptive evolution of Shewanella oneidensis MR-1 for establishment of high concentration Cr(Ⅵ) tolerance

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Frontiers of Environmental Science & Engineering 2020年第1期14卷 65-75页

作者： yong Xiao Changye Xiao feng Zhao CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China

Acclimation is the main method to enhance the productivity of microorganisms in environmental biotechnology,but it remains uncertain how microorganisms acquire resistance to high concentrations of pollutants during long-term *** oneidensis MR-1 was acclimated for 120 days with increasing hexavalent chromium(Cr(VI))concentrations from 10 to 190 mg/*** bacterium was able to survive from the highly toxic Cr(VI)environment due to its enhanced capability to reduce Cr(VI)and the increased cell membrane *** sequenced 19 complete genomes from 7 populations of MR-1,including the ancestral strain,the evolved strains in Cr(VI)environment on days 40,80 and 120 and their corresponding controls.A total of 27,49 and 90 single nucleotide polymorphisms were found in the Cr(VI)-evolved populations on days 40,80 and 120,*** substitutions were clustered according to gene functions,and the gene mutations related to integral components of the membrane,including efflux pumps and transporters,were the key determinants of chromate *** addition,MR-1 strengthened the detoxification of Cr(VI)through gene variations involved in adenosine triphosphate binding,electron carrier activity,signal transduction and DNA *** results provide an in-depth analysis of how Cr(VI)resistance of *** MR-1 is improved by acclimation,as well as a genetic understanding of the impact of longterm exposure of microorganisms to pollution.

关键词： Environmental biotechnology Acclimation Chromate resistance Efflux pumps Detoxification

Advancing sustainable agriculture: Enhancing crop nutrition with next-generation nanotech-based fertilizers

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Nano Research 2023年第12期16卷 13205-13225页

作者： Yiwen liao Dawei Xu Yuhong Cao yong-Guan Zhu State Key Laboratory of Urban and Regional Ecology Research Centre for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety National Center for Nanoscience and TechnologyBeijing 100190China

The pressing need to enhance nutrient use efficiency(NUE)in fertilizers has become increasingly urgent in light of food insecurity and climate-related *** offers promising prospects for the development of effective and environmentally friendly alternatives in the field of *** review focuses on the impact of nanotechnology on conventional fertilizers,encompassing inorganic,organic,and microbial *** emphasize the superior attributes of nano-fertilizers compared with their conventional counterparts and explore their potential and versatility in boosting crop productivity,reducing fertilizer expenses,and mitigating detrimental environmental *** conclusion,given the significant challenges posed by food insecurity and climate change,the application of nano-fertilizers demonstrates immense potential for advancing sustainable and intelligent agricultural practices.

关键词： nanobiotechnology nano-fertilizers(NFs) nutrient use efficiency(NUE) slow release sustainable agriculture

Fractionation of Polyolefin Elastomer by a Modified SSA Technique

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Chinese Journal of Polymer Science 2022年第10期40卷 1252-1258,I0010页

作者： Xin-Tong Zhao yong-feng Men State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Schoolof Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

As an important part of semicrystalline polymer materials,polyolefin elastomers are widely used,and the in-depth analysis of their molecular chain structure information is of great significance to promote their rapid *** show in this work an effort in characterizing a commercial polyolefin elastomer of ethylene/1-octene copolymer by a modified successive self-nucleation and annealing(SSA)technique.A small amount of linear polyethylene was blended with the ethylene/1-octene copolymer serving as nucleation agent during *** turned out that a tiny fraction of linear polyethylene can significantly promote the crystallization of the copolymer during cooling from different annealing temperatures and increase the melting temperature of the fractions so that providing apparent methylene sequence length much closer to the real value than obtained by traditional SSA technique.

关键词： Polyolefin elastomer Ethylene-co-octene Thermal fractionation SSA Micro structure

Two-Dimensional DOA Estimation Using One-Dimensional Search for Spherical Arrays

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Chinese Journal of Electronics 2019年第6期28卷 1259-1264页

作者： HUANG Qinghua feng Jiajun FANG yong Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University

A Reduced-dimensional spherical harmonics MUSIC(RD-SHMUSIC) is proposed to solve the problem of high computational complexity of Multiple signal classification(MUSIC) algorithm for Twodimensional(2-D) Direction of arrival(DOA) *** proposed algorithm first expresses the spherical harmonic steering vector as a linear weight of a uniform phase vectors. Via the Lagrange multiplier method, we can get a new search function to estimate elevations. At second step, the algorithm expresses the steering vector in another form, a linear weight of a vector which is constructed by associated Legendre functions. A search function to estimate azimuths can also be *** proposed method only needs One dimensional(1-D) angle search, which means it has a large reduction of computational complexity compared to the traditional Spherical harmonics MUSIC(SHMUSIC). The simulation results show that the accuracy of the proposed method is better than Two-stage decoupled approach(TSDA)algorithm, and has close performance to that of SHMUSIC.

关键词： Direction of arrival estimation Spherical arrays Reduced-dimensional spherical harmonics MUSIC Computational complexity

Visualizing Planar and Space Implicit Real Algebraic Curves with Singularities

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Journal of Systems Science & Complexity 2020年第4期33卷 1252-1274页

作者： CHEN Changbo WU Wenyuan feng yong Chongqing Key Laboratory of Automated Reasoning and Cognition Chongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China University of Chinese Academy of Sciences Beijing 100049China

This paper presents a new method for visualizing implicit real algebraic curves inside a bounding box in the 2-D or 3-D ambient space based on numerical continuation and critical point methods. The underlying techniques work also for tracing space curve in higher-dimensional *** the topology of a curve near a singular point of it is not numerically stable, the authors trace only the curve outside neighborhoods of singular points and replace each neighborhood simply by a point, which produces a polygonal approximation that is ε-close to the curve. Such an approximation is more stable for defining the numerical connectedness of the complement of the projection of the curve in R2, which is important for applications such as solving bi-parametric polynomial *** algorithm starts by computing three types of key points of the curve, namely the intersection of the curve with small spheres centered at singular points, regular critical points of every connected components of the curve, as well as intersection points of the curve with the given bounding box. It then traces the curve starting with and in the order of the above three types of points. This basic scheme is further enhanced by several optimizations, such as grouping singular points in natural clusters, tracing the curve by a try-and-resume strategy and handling "pseudo singular points". The effectiveness of the algorithm is illustrated by numerous examples. This manuscript extends the proposed preliminary results that appeared in CASC 2018.

关键词： singular neighborhood intersection

Algebraic Solution for the Forward Displacement Analysis of the General 6-6 Stewart Mechanism

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 56-62页

作者： WEI feng WEI Shimin ZHANG Ying liao Qizheng Automation School Beijing University of Posts and Telecommunications School of Mechanical and Power Engineering Henan Polytechnic University

The solution for the forward displacement analysis（FDA） of the general 6-6 Stewart mechanism（i.e., the connection points of the moving and fixed platforms are not restricted to lying in a plane） has been extensively studied, but the efficiency of the solution remains to be effectively addressed. To this end, an algebraic elimination method is proposed for the FDA of the general 6-6 Stewart mechanism. The kinematic constraint equations are built using conformal geometric algebra（CGA）. The kinematic constraint equations are transformed by a substitution of variables into seven equations with seven unknown variables. According to the characteristic of anti-symmetric matrices, the aforementioned seven equations can be further transformed into seven equations with four unknown variables by a substitution of variables using the Grobner basis. Its elimination weight is increased through changing the degree of one variable, and sixteen equations with four unknown variables can be obtained using the Grobner basis. A 40th-degree univariate polynomial equation is derived by constructing a relatively small-sized 9 × 9 Sylvester resultant matrix. Finally, two numerical examples are employed to verify the proposed method. The results indicate that the proposed method can effectively improve the efficiency of solution and reduce the computational burden because of the small-sized resultant matrix.

关键词： general 6-6 Stewart mechanism forward displacement analysis (FDA) conformal geometric algebra (CGA),Gr6bner basis Sylvester resultant

Dynamic prediction of moving trajectory in pipe jacking: GRU-based deep learning framework

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Frontiers of Structural and Civil Engineering 2023年第7期17卷 994-1010页

作者： Yi-feng YANG Shao-Ming liao Meng-Bo LIU Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 201804China

The moving trajectory of the pipe-jacking machine(PJM),which primarily determines the end quality of jacked tunnels,must be controlled strictly during the entire jacking *** prediction models to support drivers in performing rectifications in advance can effectively avoid considerable trajectory deviations from the designed jacking ***,a gated recurrent unit(GRU)-based deep learning framework is proposed herein to dynamically predict the moving trajectory of the *** this framework,operational data are first extracted from a data acquisition system;subsequently,they are preprocessed and used to establish GRU-based multivariate multistep-ahead direct prediction *** verify the performance of the proposed framework,a case study of a large pipe-jacking project in Shanghai and comparisons with other conventional models(i.e.,long short-term memory(LSTM)network and recurrent neural network(RNN))are *** addition,the effects of the activation function and input time-step length on the prediction performance of the proposed framework are investigated and *** results show that the proposed framework can dynamically and precisely predict the PJM moving trajectory during the pipe-jacking process,with a minimum mean absolute error and root mean squared error(RMSE)of 0.1904 and 0.5011 mm,*** RMSE of the GRU-based models is lower than those of the LSTM-and RNN-based models by 21.46%and 46.40%at the maximum,*** proposed framework is expected to provide an effective decision support for moving trajectory control and serve as a foundation for the application of deep learning in the automatic control of pipe jacking.

关键词： dynamic prediction moving trajectory pipe jacking GRU deep learning

Four new steroids from the marine soft coral-derived fungus Penicillium sp. SCSIO41201

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Chinese Journal of Natural Medicines 2020年第4期18卷 250-255页

作者： LONG Jie-Yi WANG Jun-feng liao Sheng-Rong LIN Xiu-Ping ZHOU Xue-feng LI Yun-Qiu YANG Bin LIU yong-Hong CAS Key Laboratory of Tropical Marine Bio-resources and Ecology/Guangdong Key Laboratory of Marine Materia Medica South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China School of Pharmacy Guilin Medical UniversityGuilin 541004China South China Branch of Innovation Academy for Drug Discovery and Development Chinese Academy of SciencesGuangzhou 510650China

Penicildiones A-D(1-4), four new steroids derivatives together with three known compounds including 16α-methylpregna-17α,19-dihydroxy-(9,11)-epoxy-4-ene-3,18-dione-20-acetoxy(5), stachybotrylactone B(6) and stachybotrin(7) were isolated from the soft coral-derived fungus Penicillium sp. SCSIO41201, cultured in the 1% NaCl PDB substrate. Their structures were determined through spectroscopic methods and X-ray crystallography. Biological evaluation results revealed that 6 exhibited significant cytotoxic activity against HL-60, K562, MOLT-4, ACHN, 786-O, and OS-RC-2 cell lines with IC50 values of 5.23, 4.12, 4.31, 23.55, 7.65 and 10.81 μmol·L-1, respectively, while other compounds showed weak or no cytotoxicity at 50 μmol·L-1.

关键词： Soft corals Marine fungus Penicillium sp. Steroids Penicildione