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船山东路东航道桥矮塔斜拉桥设计研究

现代工程科技 2024年第15期3卷 17-20页

作者：许小勇中国华西工程设计建设有限公司广东广州510006

为进一步研究矮塔斜拉桥设计技术,以衡阳船山东路东航道桥为依托,介绍该桥的总体设计、主梁设计、主塔与主墩设计、斜拉索设计、索鞍设计、结构分析等。主桥采用(120+200+120)m矮塔斜拉桥结构,墩梁塔固定体系,主梁采用单箱三室箱梁,桥... 详细信息

为进一步研究矮塔斜拉桥设计技术,以衡阳船山东路东航道桥为依托,介绍该桥的总体设计、主梁设计、主塔与主墩设计、斜拉索设计、索鞍设计、结构分析等。主桥采用(120+200+120)m矮塔斜拉桥结构,墩梁塔固定体系,主梁采用单箱三室箱梁,桥面全宽30.7 m。对该种桥型结构体系进行了总结,与具有相同跨径的连续刚构桥相比,降低了梁的高度,从而提高了主梁的应力,可为今后类似项目提供参考。

关键词：矮塔斜拉桥结构设计计算分析

在硫化钼基面上调控原子级协同活性中心用于碱氢演化反应

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Chinese Journal of Catalysis 2024年第6期61卷 281-290页

作者：罗旭宇王颖杨光刘璐郭诗颖崔义许小勇扬州大学物理科学与技术学院江苏扬州225002 中国科学院苏州纳米技术与纳米仿生研究所真空互联纳米技术工作站江苏苏州215123

电解水技术是一种生产高纯氢燃料的方法,能够增强可再生能源发电系统的消纳能力.相较于质子交换膜(PEM)电解槽,碱性(ALK)电解槽可以使用非贵金属基催化电极,拥有更高的经济效益和市场占有率.然而,由于ALK电解槽处于质子稀缺环境,阴极氢... 详细信息

电解水技术是一种生产高纯氢燃料的方法,能够增强可再生能源发电系统的消纳能力.相较于质子交换膜(PEM)电解槽,碱性(ALK)电解槽可以使用非贵金属基催化电极,拥有更高的经济效益和市场占有率.然而,由于ALK电解槽处于质子稀缺环境,阴极氢气演化反应(HER)动力学变得更加复杂,需要快速解离水分子提供动态质子微环境.硫化钼(MoS_(2))纳米片边缘具有合适的质子吸附和演化的活性位点,是制备HER催化剂的潜力材料.但其二维基面原子由于配位饱和,显示出较弱的质子吸附能力.如何调控MoS_(2)基面以实现水解动力与质子吸附演化动力的集成,提升MoS_(2)纳米片的碱性HER活性,具有重要的科学和应用意义.本文提出了一种Co/O双原子植入策略,精准调控双活性位点及其电子结构,实现了水解离动力和质子吸附演化动力的高效耦联.首先,利用刻蚀和电沉积的两步实验法,在MoS_(2)基面上成功引入O和Co原子;随后,结合高分辨透射电镜、高角环形暗场-扫描透射电子显微镜、同步辐射X射线吸收精细结构谱等表征分析技术,精准识别了掺杂Co/O原子的位置和配位情况:O原子替换部分S原子,Co原子占据Mo原子的上方,构建出立体凸起的“O-Co-S_(2)”配位构型.催化在线的原位表征分析结果表明:该独特的“O-Co-S_(2)”原子基序发挥着水解离与氢演化反应协同催化效应.密度泛函理论计算结果也证实了该协同机制,其中Co位点促进水的解离反应,而S位点则有助于质子的转化生成氢气.因此,Co/O掺杂MoS_(2)催化剂(Co-O@MoS_(2))表现出较好的碱性HER活性:仅需81 mV的过电位,即可达到100 mA cm^(‒2)的电流密度,Tafel斜率低至42 mV dec^(‒1),在600 mA cm^(‒2)的高电流密度测试中运行300 h活性无衰减.上述碱性HER性能不仅远高于原始的MoS_(2)纳米片,而且也领先于部分已报道结果.综上所述,本文在MoS_(2)基面上构筑了原子级协同催化活性中心,显著促进了碱性HER反应性能,为原子活化工程开发先进催化剂提供参考,在原子级基序构造、表征和功能分析方面提供借鉴.

关键词：碱水电解氢气演化反应硫化钼原子尺度活化协同活性位点

分数次Chebyshev小波结合SA算法求解分数阶微分方程数值解

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广西大学学报（自然科学版） 2024年第4期49卷 907-916页

作者：许小勇何通森楼钦艺朱婷东华理工大学理学院江西南昌330013

为了求解分数阶微分方程,提出了一种结合分数次第二类Chebyshev小波(FOCWs)配置法与模拟退火(SA)算法的有效数值方法。首先,构造了分数次的第二类Chebyshev小波函数,利用正则化的Beta函数,推导了分数次Chebyshev小波函数在Riemann-Liouv... 详细信息

为了求解分数阶微分方程,提出了一种结合分数次第二类Chebyshev小波(FOCWs)配置法与模拟退火(SA)算法的有效数值方法。首先,构造了分数次的第二类Chebyshev小波函数,利用正则化的Beta函数,推导了分数次Chebyshev小波函数在Riemann-Liouville分数阶积分定义下的积分计算公式。其次,利用分数次小波函数及积分公式并结合配置法,将分数阶微分方程转化为线性或非线性代数方程,给出了算法的误差估计。由于分数次小波函数中涉及分数次参数α,解的结果依赖于参数α的选择,考虑使用SA算法寻找最优参数。最后,通过数值算例验证了该方法的可行性和有效性。

关键词：分数次Chebyshev小波分数阶微分方程配置法模拟退火算法

Handily etching nickel foams into catalyst-substrate fusion self‐stabilized electrodes toward industrial‐level water electrolysis

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Carbon Energy 2023年第10期5卷 2-12页

作者： Zexuan Zhu Xiaotian Yang Jiao Liu Mingze Zhu xiaoyong xu College of Physics Science and Technology and Center for Interdisciplinary ResearchYangzhou UniversityYangzhouPeople's Republic of China Jiuchang New Energy Technology Co.Ltd. YangzhouPeople's Republic of China

The key challenge of industrial water electrolysis is to design catalytic electrodes that can stabilize high current density with low power consumption(i.e.,overpotential),while industrial harsh conditions make the balance between electrode activity and stability more ***,we develop an efficient and durable electrode for water oxidation reaction(WOR),which yields a high current density of 1000 mA cm−2 at an overpotential of only 284 mV in 1M KOH at 25°C and shows robust stability even in 6M KOH strong alkali with an elevated temperature up to 80°*** electrode is fabricated from a cheap nickel foam(NF)substrate through a simple one-step solution etching method,resulting in the growth of ultrafine phosphorus doped nickel-iron(oxy)hydroxide[P-(Ni,Fe)O_(x)H_(y)]nanoparticles embedded into abundant micropores on the surface,featured as a self-stabilized catalyst–substrate fusion *** self-stabilizing effect fastens highly active P-(Ni,Fe)O_(x)H_(y)species on conductive NF substrates with significant contribution to catalyst fixation and charge transfer,realizing a win–win tactics for WOR activity and durability at high current densities in harsh *** work affords a cost-effective WOR electrode that can well work at large current densities,suggestive of the rational design of catalyst electrodes toward industrial-scale water electrolysis.

关键词： alkaline water electrolysis industrially relevant conditions oxygen evolution reaction self‐stabilized electrodes

Synthesis and nematicidal evaluation of 1,2,3-benzotriazin-4-one derivatives containing piperazine as linker against Meloidogyne incognita

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Chinese Chemical Letters 2019年第6期30卷 1207-1213页

作者： Xiulei Chen Haowu Jia Zhong Li xiaoyong xu Shanghai Key Laboratory of Chemical Biology School of Pharmacy East China University of Science and Technology Shanghai 200237 China Shanghai Collaborative Innovation Center for Biomanufacturing Technology Shanghai 200237 China

To explore new skeleton with nematicidal activity, a series of novel 1,2,3-benzotriazin-4-one derivatives containing piperazine as linker were synthesized and varied fragments were also introduced to increase structure diversity of the new skeleton. Their inhibitory activities in vivo were evaluated against Meloidogyne incognita. The newly prepared compounds A6, A8, A21, A28 and A38 exhibited more than 50% inhibition at the concentration of 20 mg/L. Especially compound A6 displayed 71.4% inhibition against Meloidogyne incognita at the concentration of 20 mg/L. The nematicidal activities varied significantly depending on the types and positions of the substituents, which provided guidance for further structure modification.

关键词： 1 2 3-Benzotriazin-4-one Heterocycle M. incognita Nematicidal activity Fragment

Synthesis,insecticidal activity and stability study of novel nitromethylene neonicotinoids with five-membered aromatic heterocycles

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Chinese Chemical Letters 2023年第6期34卷 391-394页

作者： Li Han Zihao Yuan xusheng Shao xiaoyong xu Zhong Li Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China Shanghai Collaborative Innovation Center for Biomanufacturing Technology Shanghai 200237China

Twenty-four novel neonicotinoid analogues with nitromethylene and five-membered aromatic heterocycles were designed and *** target molecular structures have been confirmed by analytical and spectral *** compounds exhibited notable insecticidal activities against aphid(Aphis medicaginis)and brown planthopper(Nilaparvata lugens).The aqueous stability test confirmed that the stabilities of those compounds were superior to the leading compound,and the photostability was even better than that of imidacloprid.

关键词： Nitromethylene Neonicotinoids Selective reduction Stability Insecticidal activity

Synthesis and Insecticidal Evaluation of Novel Phthalic Diamides Containing 1,2,3-Triazoles via Click Reaction

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Chinese Journal of Chemistry 2014年第7期32卷 592-598页

作者： Yinbo Chen Youxin Xiao xusheng Shao xiaoyong xu Zhong Li Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China

A series of novel phthalic diamide derivatives containing 1,2,3-triazole moiety were synthesized using one-pot click chemistry approach and characterized by ^(1)H NMR and *** insecticidal activity against armyworm(Mythimna separata),Tetranychus cinnabarinus and cowpea aphid(Aphis craccivora)was *** 4Ⅱ-a and 4Ⅱ-i showed 50%insecticidal activity against armyworm(Mythimna separata)at the concentration of 4 mg/L and one-third of the compounds had moderate activity against Tetranychus cinnabarinus at 500 mg/L.

关键词： phthalic diamide 1,2,3-triazole click chemistry synthesis bioactivity

Synthesis,nematicidal evaluation,and SAR study of benzofuran derivatives containing 2-carbonyl thiophene

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Chinese Chemical Letters 2023年第5期34卷 456-460页

作者： Xiaofeng Cao Die Qiu Ruifeng Zhang Zhong Li xiaoyong xu Shanghai Key Laboratory of Chemical Biology School of PharmacyEast China University of Science and TechnologyShanghai 200237China

Plant-parasitic nematodes are major threat for crop *** lack of nematicides with new mode of action and increasing resistance raises the need for novel *** order to seek new nematicidal lead,originating from the structure of chalcone,a series of fused ring compounds was obtained by ring closure design *** compounds were modified *** nematicidal activity against *** of synthesized compounds was *** bioassay showed that compound 3 and some of its derivatives such as compounds 18,19,21,22,23,24 and 26 exhibited excellent nematicidal *** them,compound 23 exhibited significant *** LC50/72 hvalue reached 3.20 mg/L in vitro and the inhibition rate was 100.00%at 40 mg/L in the *** structure-activity relationship of synthesized compounds was discussed in *** influence of compound 23 on egg hatching,motility,and feeding behavior of *** was also evaluated.

关键词： Benzofuran Nematicide M.incognita C.elegans Structure-activity relationship

Synthesis of Trisubstituted Isoxazoles from Nitroenamines and Aromatic Aldehydes

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Chinese Journal of Chemistry 2017年第10期35卷 1517-1521页

作者： Chao Lei Zhenhong Gao xusheng Shao xiaoyong xu Zhong Li Shanghai Key Laboratory of Chemical Biology School of Pharmacy East China University of Science and Technology Shanghai 200237 China Shanghai Collaborative Innovation Center for Biomanufaeturing Technology Shanghai 200237 China

A novel approach for the synthesis of trisubstituted isoxazoles from nitroenamines and aromatic aldehydes is developed. L-Proline/potassium carbonate system was employed to promote this process. The reaction underwent nucleophilic attack of nitroenamines to aromatic aldehydes, intramolecular denitration, tautomerization and elimination of H2O to furnish the target compounds.

关键词： isoxazoles nitroenamines denitration heterocycles synthetic methods