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Discovery of a new family member of arsenic–vanadium polyoxometalates with high catalytic performance for one-pot coupling of CO2, epoxides and amines

作者： GAO Si-ze NI Bang-fa ZHANG Gui-ying XIAO Cai-jin liu Cun-xiong CHEN Zhe NIE Peng liu chao ZHAO Chang-jun College of Physics Science and Engineering Technology Guangxi University

This system is designed to pick up sound signals from large volume,low-threshold energy, low-background superheated droplets bubble detectors.A sound-sensitive bubble detector is composed of a container filled with a mixture of superheated droplets and gel,a temperature and pressure control system,and an audio acquisition system attached on the outer surface of the *** superheated droplets are in a metastable and superheated state at ambient temperature and *** the outside

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Tungsten 2025年第1期7卷 80-87页

作者： Fang-Qian Wang Yin Zhang Wei-Wei Wang Mei-Qian Fu Hong-Bing Mo Wei-Dong Yu chao liu Jun Yan College of Chemistry and Chemical Engineering Central South University Junior Education Department Changsha Normal University School of Science Hunan University of Technology and Business

Arsenic-vanadium polyoxometalates（POMs） represent a family of tremendous potential catalysts owing to their peculiar physical and chemical *** in CO2conversion,using POMs to catalyze the conversion of CO2and epoxide into chemical intermediates is the research ***,A new family number of arsenic-vanadium POMs,[N（CH3）4]4[As8V12O38（H2O）]·2H2O({As8V12O38}),was reported and characterized by single-crystal X-ray diffraction,fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,*** from other allotropicity,{As8V12O38}shows a different structure pattern with an I-43d *** obtained {As8V12O38} was employed as a catalyst for the *** initial catalytic reaction confirmed that {As8V12O38} can catalyze the formation of epoxy carbonate by using 1.01 kPa CO2and epoxide at 70℃.Furtherly,when added amine in the catalytic system,oxazolidinone could be obtained by high yields,which provides an efficient way to convert CO2into profitable ***,a possible catalytic reaction mechanism was proposed by using different characterization analyses.{As8V12O38} first catalyzes the epoxide and CO2to form an epoxy carbonate and then catalyzes epoxy carbonate and benzylamine into oxazolidinone.

关键词： Arsenic CO2 conversion Oxazolidinone Polyoxometalates Vanadium

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基于改进DGCNN的树木点云分割方法

南京农业大学学报 2025年第1期48卷 240-248页

作者：刘超卜鑫荣刘慧杨官学沈跃徐婕江苏大学电气信息工程学院江苏镇江212000

[目的]通过目标分割为果园喷雾机提供树木的表征信息,使喷雾机能够实现精准喷雾。在分割过程中,对苗圃中的树冠、树干等不同部位进行分割,可以帮助喷雾机对喷雾部分对靶,在果园或苗圃景观中实现自动导航以及精准喷药等操作。与图片相比... 详细信息

[目的]通过目标分割为果园喷雾机提供树木的表征信息,使喷雾机能够实现精准喷雾。在分割过程中,对苗圃中的树冠、树干等不同部位进行分割,可以帮助喷雾机对喷雾部分对靶,在果园或苗圃景观中实现自动导航以及精准喷药等操作。与图片相比,点云能够更好地表征树木的三维结构并且受照明条件影响小,因此针对点云树木设计分割算法更适合应用在果园、苗圃等室外环境作业的农业机械。[方法]本文基于DGCNN提出了一种分割精度准确、参数量小的树木点云分割网络——TSNet,它可以很容易被部署在果园喷雾机上。该网络主要具有以下特点:1)该网络是基于DGCNN改进的,可以更好实现点云分割任务;2)网络引入了连续递归门控卷积模块(gnConv),可以提高树木分割的准确率;3)为避免全局信息损失并增加信息传递效率,我们设计了权重通道用于特征传递。[结果]TSNet分割树木的mIoU达到90.08%,模型大小为0.72 M,优于PointNet、PointNet++、DGCNN、CurveNet、PointMLP和D-PointNet++等常用的点云分割算法。[结论]TSNet能够为苗圃树木检测识别和农业机器人作业提供更准确的感知信息。

关键词：点云树木分割深度学习精准喷雾果园喷雾机

基于产教融合的汽车营销情境模拟教学模式研究

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汽车实用技术 2025年第1期50卷 132-135页

作者：刘超刘子萌青岛黄海学院山东青岛266427

随着汽车营销行业人才结构需求的转变,高校更需要注重汽车营销实践技能的培养。因此,基于产教融合的汽车营销情境模拟教学模式改革,可以更好地将产业与教学紧密结合,通过模拟真实汽车营销场景,让学生在实践中学习汽车营销的理论知识、... 详细信息

随着汽车营销行业人才结构需求的转变,高校更需要注重汽车营销实践技能的培养。因此,基于产教融合的汽车营销情境模拟教学模式改革,可以更好地将产业与教学紧密结合,通过模拟真实汽车营销场景,让学生在实践中学习汽车营销的理论知识、掌握营销操作技能,并增强实际应用能力。通过对汽车营销课程的情境创设、任务驱使、实践模拟以及产教结合等,实现汽车营销理论与实践的深度融合,在有效提升教学质量与效果的同时,有效培养学生的实践能力和创新精神,并在此基础上更好地推动汽车营销行业的创新发展以及教育资源优化配置。

关键词：产教融合情境模拟教学模式汽车营销

The role of metal oxides on oxidant decay and disinfection byproduct formation in drinking waters: Relevance to distribution systems

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Journal of Environmental Sciences 2021年第12期33卷 140-149页

作者： chao liu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Maintaining a residual disinfectant/oxidant(e.g., chlorine and chlorine dioxide), is a generally used strategy to control microbial contaminants and bacterial regrowth in distribution systems. Secondarily oxidant, such as hypobromous acid(HOBr), can be formed during chlorination of bromide-containing waters. The decay of oxidants and formation of disinfection byproducts(DBPs) due to the interaction between oxidants and selected metal oxides were studied. Selected metal oxides generally enhanced the decay of these halogencontaining oxidants via three pathways:(1) catalytic disproportionation to yield an oxidized form of halogen(i.e., halate) and reduced form(halide for chlorine and bromine or chlorite for chlorine dioxide),(2) oxygen formation, and(3) oxidation of a metal in a reduced form(e.g., cuprous oxide) to a higher oxidation state. Cupric oxide(Cu O) and nickel oxide(Ni O)showed significantly strong abilities for the first pathway, and oxygen formation was a side reaction. Cuprous oxide can react with oxidants via the third pathway, while goethite was not involved in these reactions. The ability of Cu O on catalytic disproportionation of HOBr remained stable up to four cycles. In chlorination process, bromate formation tends to be important(exceeding 10 μg/L) when initial bromide concentration is above 400 μg/L in the presence of dissolved organic matter. Increasing initial bromide concentrations increased the formation of DBPs and calculated cytotoxicity, and the maximum was observed at p H8.6 during chlorination process. Therefore, the possible disinfectant loss and DBP formation should be carefully considered in drinking water distribution systems.

关键词： Cupric oxide Disproportionation Bromine Bromate Chlorine dioxide Chlorate

Mode shape description of an aero-engine casing structure using Zernike moment descriptors

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航空动力学报 2011年第4期26卷 760-770页

作者： liu Ying-chao ZANG chao-ping College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

Vibration mode shape description of an aero-engine casing structure using Zernike moment descriptor(ZMD) was introduced in this *** mode shapes of the aero-engine casing structure can be decomposed as a linear combination of a series of Zernike polynomials,with the feature of each Zernike polynomial reflecting a part of characteristic of mode shapes,based on Zernike moment ***,the reconstruction of mode shapes with ZMD was explored and its ability to filtering the noise contaminated in the mode shapes was *** of the aero-engine casing structure indicated the advantage of this method to depict the mode shapes of a symmetric *** demonstrate that the Zernike moment description of the mode shapes can effectively describe the double modes in the symmetric structure and also has the ability to remove or significantly reduce the influence of noise in the mode *** feature shows great practical value for further research on the correlation,model updating and model validation of the symmetric structure's finite element model.

关键词： Zernike mode shape modal assurance criterion(MAC) reconstruction noise filtering

Spin-Orbit Components of Resonant Satellite Photoionization of Atomic Cu

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Chinese Physics Letters 1996年第12期13卷 899-901页

作者： liu Jin-chao Institute of Physics Sichuan Union UniversityChengdu 610065 Department of Physics University of VirginiaCharlottesvilleVirginia 22901 U.S.A.

A new approach of the study on the spin-orbit components of resonant satellite photoionization has been carried out from many-body perturbation *** 3d^(8)4s^(2)(^(1)G,^(3)F,^(1)D)satellite lines of atomic Cu are resonantly enhanced and separated by the spin-orbit splitting at the energy of the 3p^(6)3d^(10)4s→3p^(5)(^(2)P_(1/2),^(2)P_(3/2))3d^(10)4s^(2) *** calculated results showing that the spin-orbit splitting leads to the separation of resonant peaks of satellite lines are in good agreement with experiment.

关键词： theory experiment resonant

Theoretical Prediction of Differential Cross Sections for Reaction pp → pK^＋A in a Resonance Model

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Communications in Theoretical Physics 2006年第3X期46卷 501-506页

作者： liu Bo-chao Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918 (4) Beijing 100049 China Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion Accelerator Lanzhou 730000 China Institute of Theoretical Physics the Chinese Academy of Sciences Beijing 100080 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China

The reaction of pp → pK^＋A is a very good channel to study N^＊ resonances through their KA decay mode, because there is no mixing of isospin I = 1/2 and I = 3/2 due to isospin conservation. In this work, we extend a resonance model, which can reproduce the total cross section very well, to offer differential cross section information about this reaction. It can serve as a reference to build the scheduled hadron detector at Lanzhou Cooler Storage Ring （CSR）. Experiment measurement of these differential cross sections in the future will supply us more constraints on the model and help us understanding the strangeness production dynamics better.

关键词： resonance model pp collision

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扭曲双层石墨烯的层间电导特性研究

原子与分子物理学报 2025年第6期42卷 83-88页

作者：陶懿洲刘超方贺男南京邮电大学电子与光学工程学院南京210023

扭曲双层石墨烯(TBG)由于具有莫特绝缘和非常规超导等新奇的电学特性,在纳米技术领域存在巨大的应用潜力.本文基于光学衍射物理方法,构建了一个适用于TBG的理论模型,并利用该理论模型研究了TBG的层间电导特性.研究结果较好地解释了TBG... 详细信息

扭曲双层石墨烯(TBG)由于具有莫特绝缘和非常规超导等新奇的电学特性,在纳米技术领域存在巨大的应用潜力.本文基于光学衍射物理方法,构建了一个适用于TBG的理论模型,并利用该理论模型研究了TBG的层间电导特性.研究结果较好地解释了TBG层间电导随扭转角变化的实验结果,并阐明了其物理机制.此外,本文还计算了电极参数、隧穿层厚度以及界面势强度等物理因素对层间电导特性的影响.计算结果表明:随着电极化学势的增大,层间电导关于扭转角的变化曲线近似整体向上平移;层间电导随着上层隧穿层厚度的增加而衰减并趋于稳定,而随着下层隧穿层厚度振荡;TBG两层扭转石墨烯的界面势强度越强,则层间电导随扭转角下降得越快.

关键词：低维物理层间电导光学衍射方法扭曲双层石墨烯

On Connectivity of Flying Ad Hoc Networks in the Presence of Ground Terminal

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China Communications 2021年第9期18卷 1-10页

作者： chao liu Zhongshan Zhang School of Computer and Communication Engineering University of Science and Technology(USTB)BeijingBeijing 100083China School of Information and Electronics Beijing Institute of Technology(BIT)Beijing 100081China

The Unmanned Aerial Vehicle(UAV)technologies are envisioned to play an important role in the era of Air-Space-Ground integrated *** this paper,we investigate the connectivity of a Flying Ad hoc Network(FANET)in the presence of a groundbased *** particular,the connected probability of the UAV-to-UAV (U2U) link as well as that of the UAV-to-Ground (U2G) link in a three dimensional (3D) space are ***,to mitigate the aggregate interference from UAV individuals,a priority based power control scheme is implemented for enhancing the connectivity of both U2U and U2G *** results illustrate the effectiveness of the proposed analysis.

关键词： flying ad hoc network UAV swarm connectivity power control connected probability