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Journal of Envir.nmental Sciences 2024年第2期136卷 547-558页

作者： Yong Wang Cheng Liu Haoyun Hu Qiujun Lu Haiyan Wang Chenxi Zhao Fuyou du ningli Tang Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004China College of Biological and Envir.nmental Engineer.ng Changsha UniversityChangsha 410022China

The construction and application of novel highly efficient photocatalysts have been the focus in the field of envir.nmental pollutant *** this work,a novel CuFe_(2)O_(4)/Bi_(12)O_(17)Cl_(2)photocatalysts were synthesized by simple hydrothermal and chemical precipitation *** fabricated CuFe_(2)O_(4)/Bi_(12)O_(17)Cl_(2)composite exhibited much higher photocatalytic activity than pristine CuFe_(2)O_(4)and Bi_(12)O_(17)Cl_(2)in the removal of bisphenol A(BPA)under visible-light illumination,which ascribed to the intr.nsic p-n junction of CuFe_(2)O_(4)and Bi_(12)O_(17)Cl_(2).The photocatalytic degradation rate of BPA on CuFe_(2)O_(4)/Bi_(12)O_(17)Cl_(2)with an optimized CuFe_(2)O_(4)content(1.0 wt.%)reached 93.0%within 30 *** capture experiments of active species confirmed that the hydroxyl radicals(·OH)and superoxide radicals(·O_(2)^(-))played crucial roles in photocatalytic BPA degradation ***,the possible degradation mechanism and pathways of BPA was proposed according to the detected intermediates in photocatalytic reaction process.

关键词： Bi_(12)O_(17)Cl_(2) CuFe_(2)O_(4) Heterojunction Bisphenol A Photocatalytic degradation

Geochemistry and origins of hydrogen-containing natural gases in deep Songliao Basin,China:Insights from continental scientific drilling

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Petroleum Science 2024年第2期21卷 741-751页

作者： Shuang-Biao Han Chao-Han Xiang Xin du Lin-Feng Xie Jie Huang Cheng-Shan Wang College of Geoscience and Surveying Engineer.ng China University of Mining and TechnologyBeijing100083China State Key Laboratory of Biogeology and Envir.nmental Geology China University of GeosciencesBeijing100083China

The differ.nt reservoirs in deep Songliao Basin have non-homogeneous lithologies and include multiple layers with a high content of hydrogen *** gas composition and stable isotope characteristics vary significantly,but the origin analysis of differ.nt gas types has previously been *** on the geochemical parameters of gas samples from differ.nt depths and the analysis of geological settings,this research covers the diverse origins of natural gas in differ.nt *** gas components are mainly methane with a small amount of C_(2+),and non-hydrocarbon gases,including nitrogen(n_(2)),hydrogen(H_(2)),carbon dioxide(CO_(2)),and helium(He).At greater depth,the carbon isotope of methane becomes heavier,and the hydrogen isotope points to a lacustr.ne sedimentary *** increasing depth,the origins of n_(2)and CO_(2)change gradually from a mixture of organic and inorganic to *** origins of hydrogen gas are complex and include organic sources,water radiolysis,water-rock(Fe^(2+)-containing minerals)reactions,and *** shales of Denglouku and Shahezi Formations,as source rocks,provide the premise for generation and occurr.nce of organic ***,the deep faults and fluid activities in Basement Formation control the generation and migration of mantle-derived *** discovery of a high content of H_(2)in study area not only reveals the organic and inorganic association of natural-gas generation,but also provides a scientific basis for the exploration of deep hydrogen-rich gas.

关键词： Gas compositions Stable isotopes Gas origins Hydrogen gas Songliao Basin

The degradation of cathodic Fe/n/C catalyst in PEMFCs:The evolution of remanent active sites after demetallation

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Journal of Materials Science & Technology 2024年第6期173卷 100-106页

作者： Xiaohua Yang Wentao Sun Jiatang Chen Yang Gao r.ngxian Zhang Qun Luo Tao Lyu Lei du Institut national de la recherche Scientifique-Énergie Matériaux et Télécommunications J3X 1P7 VarennesQCCanada School of Chemistry and Chemical Engineer.ng Jiangsu UniversityZhenjiang 212013China State Key Laboratory of Advanced Special Steels&Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Huangpu Hydrogen Energy Innovation Center School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China

The state-of-the-art Fe/n/C catalyst has presented comparable initial cathode performance to the benchmark Pt/C catalyst in proton exchange membr.ne fuel cells(PEMFCs).However,the major bottleneck is its significant activity decay in real-world PEMFC *** superposed“fast decay”and“slow decay”have been well documented to describe the degradation process of Fe/n/C catalysts dur.ng PEMFC *** fast decay has been well understood in close relation to the demetallation at the initial 15-h stability ***,it is still unclear how the remanent active sites evolve after *** this end,the catalyst performance and evolution of a typical Fe/n/C active site were herein investigated through postmortem characterizations of the membr.ne electrode assemblies(MEAs)after differ.nt *** is presented that 1 bar pressure and 80℃ temperature are the optimized conditions for Fe/n/C ***,the“fast decay”in the initial 15 h is immune to the various operating parameters,while the“slow decay”highly depends on the applied temperature and *** to the X-ray absorption spectra(XAS)analysis and stability test of MEA,the gradual evolution of Fe-n coordination to Fe-O is found correlated with the“slow decay”and accounts for the catalyst decay after the demetallation process.

关键词： Fe/n/C Stability Decay mechanism Metal oxidation PEMFCs

Early chatter identification based on optimized VMD with multi-band information fusion and compression method in robotic milling process

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Chinese Journal of Aer.nautics 2024年第6期37卷 464-484页

作者： Sichen CHEn Zhiqiang LIAnG Yuchao du Zirui GAO Haor.n ZHEnG Zhibing LIU Tianyang QIU Xibin WAnG School of Mechanical Engineer.ng Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Undesirable self-excited chatter has always been a typical issue restricting the improvement of robotic milling quality and *** chatter identification based on processing signals can prompt operators to adjust the machining process and prevent chatter *** with the traditional machine tool,the uncertain multiple chatter frequency bands and the band-moving of the chatter frequency in robotic milling process make it more challenging to extract chatter *** paper proposes a novel method of chatter identification using optimized variational mode decomposition(OVMD)with multi-band information fusion and compression technology(MT).dur.ng the robotic milling process,the number of decomposed modes k and the penalty coefficient a are optimized based on the dominant component of frequency scope partition and fitness of the mode center ***,the mayfly optimization algorithm(MA)is employed to obtain the global optimal parameter *** order to conquer information collection about the uncertain multiple chatter frequency bands and the band-moving of the chatter frequency in robotic milling process,MT is presented to reduce computation and extract signal ***,the cross entropy of the image(CEI)is proposed as the final chatter indicator to identify the chatter *** robotic milling experiments are carried out to verify the proposed method,and the results show that it can distinguish the robotic milling condition by extracting the uncertain multiple chatter frequency bands and overcome the band-moving of the chatter frequency in robotic milling process.

关键词： robotic milling Chatter detection Variational mode decomposition Information fusion and compression Chatter featur

Improving pixel-based regional landslide susceptibility mapping

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Geoscience Fr.ntiers 2024年第4期15卷 196-216页

作者： Xin Wei Paolo Gardoni Lulu Zhang Lin Tan Dongsheng Liu Chunlan du Hai Li State Key Laboratory of Ocean Engineer.ng Department of Civil EngineeringShanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration(CISSE) Shanghai 200240China Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Shanghai 200240China Department of Civil and Envir.nmental Engineer.ng MAE Center:Creating a Multi-Hazard Approach to EngineeringUniversity of Illinois at Urbana-Champaign205 N.Mathews AveUrbana IL 61801United States Chongqing Bureau of Geology and Minerals Exploration Chongqing 401121China Hydrogeology&Engineer.ng Team 208 Chongqing Bureau of Geology and Minerals Exploration(Chongqing Reconnaissance and Design Academy of Geological Disasters Prevention and Treatment Engineering)Chongqing 400700China

regional landslide susceptibility mapping(LSM)is essential for risk *** deep learning algorithms are increasingly used in LSM,their extensive parameters and scarce labels(limited landslide records)pose training *** contrast,classical statistical algorithms,with typically fewer parameters,are less likely to overfit,easier to train,and offer greater ***,integrating physics-based and data-driven approaches can potentially improve *** paper makes several contributions to enhance the practicality,interpretability,and cross-regional generalization ability of regional LSM models:(1)Two new hybrid models,composed of data-driven and physics-based modules,are proposed and *** ModelⅠcombines the infinite slope stability analysis(ISSA)with logistic regression,a classical statistical *** ModelⅡintegrates ISSA with a convolutional neural network,a representative of deep learning *** physics-based module constructs a new explanatory factor with higher.nonlinearity and reduces prediction uncertainty caused by incomplete landslide inventory by pre-selecting non-landslide *** data-driven module captures the rela-tion between explanatory factors and landslide inventory.(2)A step-wise deletion process is proposed to assess the importance of explanatory factors and identify the minimum necessary factors required to maintain satisfactory model performance.(3)Single-pixel and local-area samples are compared to understand the effect of pixel spatial neighborhood.(4)The impact of nonlinearity in data-driven algorithms on hybrid model performance is *** landslide-pr.ne regions in the Three Gorges reservoir,China,are used as the study *** results show that,in the testing region,by using local-area samples to account for pixel spatial neighborhoods,Hybrid ModelⅠachieves roughly a 4.2%increase in the ***,models with 30 m resolution land-cover data surpass those using 1

关键词： Landslide susceptibility mapping Logistic regression Convolutional neural network Hybrid model Interpretability Cross-regional generalization

腙基席夫碱配体铜(Ⅱ)配合物的合成、结构表征、生物活性和密度泛函理论计算

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无机化学学报 2024年第7期40卷 1409-1422页

作者： Bhattacharjee Maitri Boruah Smriti rekha dutta Purkayastha r.n. Maniukiewicz Waldemar Chowdhury Shubhamoy Maiti Debasish Akhtar Tamanna Department of Chemistry Tripura UniversitySuryamaninagar‑799022TripuraIndia Institute of General and Ecological Chemistry Lodz University of TechnologyZeromskiego 11690‑924ŁódzPoland Department of Chemistry University of GourbangaMokdumpurMaldaWest Bengal‑732103India Department of Human Physiology Tripura UniversitySuryamaninagar‑799022TripuraIndia

以甲醇为介质,合成了3种新的席夫碱配体HL^(1)(2-hydroxybenzaldehyde2-(2-oxo-1,2-diphenylethylidene)hydrazone)、HL^(2)(4-hydroxybenzaldehyde2-(2-oxo-1,2-diphenylethylidene)hydrazone)和L^(3)(2-methoxybenzaldehyde2-(2-oxo-1,2-diphenylethylidene)hydrazone)的Cu(Ⅱ)配合物1-3。通过元素分析、光谱方法、磁化率测量和密度泛函理论(DFT)计算对配合物进行了表征。通过单晶X射线衍射研究对合成的配体进行了结构表征。通过DFT计算确定了配合物的优化结构。通过紫外可见吸收光谱和荧光发射光谱研究了配合物与小牛胸腺DnA(CT-DnA)的结合能力。吸收光谱研究揭示了增色效应,并提出了与CT-DnA相互作用的可能模式。溴化乙锭(EB)竞争结合研究表明,配合物可以取代DnA-EB加合物中的DnA,且配合物可能以嵌入模式与CTDnA结合。配合物对革兰氏阴性肺炎克雷伯菌、大肠杆菌、鲍氏志贺菌和革兰氏阳性金黄色葡萄球菌的体外抗菌活性研究表明,配合物2对肺炎克雷伯菌和鲍氏志贺菌具有明显抗菌活性,但配合物1和3没有表现出任何显著的抗菌活性。

关键词： Cu(Ⅱ)配合物席夫碱结构生物活性密度泛函理论

Low Surface Brightness Galaxies Selected by Differ.nt Model Fitting

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research in Astr.nomy and Astrophysics 2024年第1期24卷 223-236页

作者： Bing-Qing Zhang Hong Wu Wei du Pin-Song Zhao Min He Feng-Jie Lei Key Laboratory of Optical Astr.nomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astr.nomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

We present a study of low surface brightness galaxies(LSBGs) selected by fitting the images for all the galaxies inα.40 SDSS Dr7 sample with two kinds of single-component models and two kinds of two-component models(disk+bulge):single exponential,single sersic,exponential+deVaucular(exp+deV),and exponential+sérsic(exp+ser).Under the criteria of the B band disk central surface brightness μ_(0,disk)(B)≥22.5 mag arcsec^(-2) and the axis ratio b/a> 0.3,we selected four.none-edge-on LSBG samples from each of the models which contain 1105,1038,207,and 75 galaxies,*** are 756 galaxies in common between LSBGs selected by exponential and sersic models,corresponding to 68.42% of LSBGs selected by the exponential model and 72.83% of LSBGs selected by the sersic model,the rest of the discrepancy is due to the differ.nce in obtaining μ_(0) between the exponential and sersic *** on the fitting,in the r.nge of 0.5≤n≤1.5,the relation of μ_(0) from two models can be written as μ_(0,sérsic)-μ_(0,exp)=-1.34(n-1).The LSBGs selected by disk+bulge models(LSBG_(2)comps) are more massive than LSBGs selected by single-component models(LSBG_1comp),and also show a larger disk *** the bulges in the majority of our LSBG_(2)comps are not prominent,more than 60% of our LSBG_(2)comps will not be selected if we adopt a single-component model *** also identified 31 giant low surface brightness galaxies(gLSBGs) from LSBG_(2)*** are located at the same region in the color-magnitude diagram as other *** we compared differ.nt criteria of gLSBGs selection,we find that for gas-rich LSBGs,M_(*)> 10^(10)M_⊙ is the best to distinguish between gLSBGs and normal LSBGs with bulge.

关键词： catalogs galaxies:spiral galaxies:bulges methods:data analysis methods:statistical

Effect and mechanism of reductive polyaniline on the stability of nitrocellulose

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Defence Technology（防务技术） 2024年第8期38卷 217-225页

作者： Wenjiang Li Binbin Wang Huimin Chen Aoao Lu Chenguang Li Qiang Li Fengqiang nan Ping du School of Chemistry and Chemical Engineer.ng Nanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Special Energy Materials Ministry of EducationNanjing 210094China

The search for.new green and efficient stabilizers is of great importance for the stabilization of nitrocellulose(nC). This is due to the shortcomings of traditional stabilizers, such as high toxicity. In this study, reduced polyaniline(r-PAnI), which has a similar functional structure to diphenylamine(DPA) but is non-toxic, was prepared from PAnI based on the action with n_(2)H_(4) and nH_(3)-H_(2)O, and used for the first time as a potential stabilizer for.nC. XPS, FTIr, raman, and SEM were used to characterize the reduced chemical structure and surface morphology of r-PAnI. In addition, the effect of r-PAnI on the stabilization of nC was characterized using DSC, VST, isothermal TG, and MMC. Thermal weight loss was reduced by 83% and 68% and gas pressure release by 75% and 49% compared to pure nC and nC&3%DPA, *** and XPS were used to characterize the structural changes of r-PAnI before and after reaction with nO_(2). The 1535 cm^(-1) and 1341 cm^(-1) of the FTIr and the 404.98 eV and 406.05 eV of the XPS showed that the -nO_(2) was generated by the absorption of nO_(2). Furthermore, the quantum chemical calculation showed that nO_(2) was directly immobilized on r-PAnI by forming -nO_(2) in the neighbor.ng position of the benzene r.ng.

关键词： nitrocellulose Green stabilizer Polyaniline Mechanism of stability

Chebyshev polynomial-based ritz method for thermal buckling and free vibration behaviors of metal foam beams

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 891-910页

作者： n.D.nGUYEn T.n.nGUYEn Faculty of Civil Engineer.ng Ho Chi Minh City University of Technology and EducationHo Chi Minh City 71309Viet Nam Faculty of Engineer.ng and Technology Kien Giang UniversityChau Thanh 92000Viet Nam

This study presents the Chebyshev polynomials-based ritz method to examine the thermal buckling and free vibration characteristics of metal foam *** analyses include three models for porosity distribution and two scenarios for thermal *** material properties are assessed under two conditions,i.e.,temperature dependence and temperature *** theoretical framework for the beams is based on the higher-order shear deformation theory,which incorporates shear deformations with higher-order *** governing equations are established from the Lagr.nge equations,and the beam displacement fields are approximated by the Chebyshev *** simulations are performed to evaluate the effects of thermal load,slenderness,boundary condition(BC),and porosity distribution on the buckling and vibration behaviors of metal foam *** findings highlight the significant influence of temperature-dependent(TD)material properties on metal foam beams'buckling and vibration responses.

关键词： ritz method Chebyshev function buckling vibration metal foam beam higher-order beam theory(HOBT)

Explor.ng charge and spin fluctuations in infinite-layer cuprate SrCuO_(2)from a phonon perspective

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Science China(Physics,Mechanics & Astr.nomy) 2024年第8期67卷 159-167页

作者： Xin du Pei-Han Sun Ben-Chao Gong Jian-Feng Zhang Zhong-Yi Lu Kai Liu Department of Physics and Beijing Key Laboratory of Opto-electr.nic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Department of Physics School of ScienceJiangsu University of Science and TechnologyZhenjiang 212100China Institute of Physics Chinese Academy of SciencesBeijing 100190China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China

The infinite-layer cuprate ACu O_(2)(A=Ca,Sr,Ba)possesses the simplest crystal structure among numerous cuprate superconductors and can serve as a prototypical system to explore the unconventional *** on the first-pr.nciples electr.nic structure calculations,we have studied the electr.nic and magnetic properties of the infinite-layer cuprate SrCuO_(2)from a phonon *** find that interesting fluctuations of charges,electrical dipoles,and local magnetic moments can be induced by the atomic displacements of phonon modes in SrCuO_(2)upon the hole *** all optical phonon modes of SrCuO_(2)in the antiferromagnetic néel state,only the A_(1g)mode that involves the full-breathing O vibrations along the Cu-O bonds can cause significant fluctuations of local magnetic moments on O atoms and dramatic charge redistributions between Cu and O ***,due to the atomic displacements of the A_(1g)mode,both the charge fluctuations on Cu and the electrical dipoles on O show a dome-like evolution with increasing hole doping,quite similar to the experimentally observed behavior of the superconducting T_(c);in comparison,the fluctuations of local magnetic moments on O display a monotonic enhancement along with the hole *** analyses indicate that around the optimal doping,there exists a large softening in the frequency of the A_(1g)phonon mode and a van Hove singularity in the electr.nic structure close to the Fermi level,suggesting potential electr.n-phonon *** work reveals the important role of the full-breathing O phonon mode playing in the infinite-layer SrCuO_(2),which may provide new insights in understanding the cuprate superconductivity.

关键词： first-pr.nciples calculations cuprate superconductors phonon charge and spin fluctuations