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Journal of Rare Earths 2010年第S1期28卷 362-366页

作者： chang-mao hung Department of Vehicle Engineering Yung-Ta Institute of Technology and Commerce316 Chung-Shan RoadLinloPingtung 909Taiwan

The manufacture,physical characterization,environmental applications and cytotoxicity properties of nanocomposites consisting of CuO/CeO2 nano-rare earth composite materials prepared using the coprecipitation method at molar ratio of 6:4 with aqueous solutions of copper nitrate and cerium nitrate were *** performance of the selective catalytic oxidation of ammonia to N2(NH3-SCO) over a CuO/CeO2 nano-rare earth composite materials in a tubular fixed-bed reactor(TFBR) at temperatures from 423 to 673 K in the presence of oxygen was *** catalytic redox behavior was determined by cyclic voltammetry(CV).The nanocomposite particles were characterized by TEM,with a tiny particle size around 10 nm with high dispersion ***,cell cytotoxicity and the percentage cell survival were determined by using 3-(4,5-dimethylthiazol-2-yl)-5(3-carboxymethoxyphenol)-2-(4-sulfophenyl)-2H-tetra-zolium(MTS) assay on human lung MRC-5 cell *** results showed that no apparent cytotoxicity was observed when the MRC-5 was exposed to the CuO/CeO2 nanocomposite materials.

关键词： selective catalytic oxidation (SCO) tubular fixed-bed reactor (TFBR) ammonia CuO/CeO2 nanocomposite material cytotoxicity rare earths

Investigation of fluorescence characterization and electrochemical behavior on the catalysts of nanosized Pt-Rh/y-AI203 to oxidize gaseous ammonia

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Frontiers of Environmental Science & Engineering 2013年第3期7卷 428-434页

作者： chang-mao hung Wen-Liang LAI Jane-Li LIN Department of Vehicle Engineering Yung-Ta Institute of Technology and Commerce Pingtung 909 China Department of Environmental Science and Occupational Safety and Hygiene Tajen University Pingtung 907 China

This work describes the environmentally friendly technology for oxidation of ammonia （NH3） to form nitrogen at temperatures range from 423K to 673K by selective catalytic oxidation （SCO） over a nanosized Pt- Rh/γ-A12O3 catalyst prepared by the incipient wetness impregnation method of hexachloroplatinic acid （H2PtC16） and rhodium （Ⅲ） nitrate （Rh（NO3）3） with γ-A12O3 in a tubular fixed-bed flow quartz reactor （TFBR）. The characterization of catalysts were thoroughly measured using transmission electron microscopy （TEM）, three- dimensional excitation-emission fluorescent matrix （EEFM） spectroscopy, UV-Vis absorption, dynamic light- scattering （DLS）, zeta potential meter, and cyclic voltam- metry （CV）. The results demonstrated that at a temperature of 673K and an oxygen content of4%, approximately 99% of the NH3 was removed by catalytic oxidation over the nanosized Pt-Rh/γ-A12O3 catalyst. N2 was the main product in NH3-SCO process. Further, it reveals that the oxidation of NH3 was proceeds by the over-oxidation of NH3 into NO, which was conversely reacted with the NH3 to yield N2. Therefore, the application ofnanosized Pt-Rh/γ-A12O3 catalyst can significantly enhance the catalytic activity toward NH3 oxidation. One fluorescent peak for fresh catalyst was different with that of exhausted catalyst. It indicates that EEFM spectroscopy was proven to be an appropriate and effective method to characterize the Pt clusters in intrinsic emission from nanosized Pt-Rh/γ-A12O3 catalyst. Results obtained from the CV may explain the significant catalytic activity of the catalysts.

关键词： ammonia (NH3) nanosized Pt- Rh/γ-A12O3catalyst excitation-emission fluorescent matrix (EEFM) selective catalytic oxidation (SCO) tubular fixed-bedreactor (TFBR)

Selective Catalytic Oxidation Catalyst for Removal of Ammonia from Biomass Gasification Gas. Part 2. Reaction Kinetic Behavior Study

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Selective Catalytic Oxidation Catalyst for Removal of Ammoni...

Paving the Way towards Green Development:Impact of the Belt and Road Initiative on Electrification in Participating Countries

第八届海峡两岸气溶胶技术研讨会暨第三届空气污染技术研讨...

作者： chang-mao hung Department of Vehicle Engineering Yung-Ta Institute of Technology and Commerce 316 Chung-Shan Road Linlo Pingtung 909 Taiwan.

Ammonia （NH3） is widely found in industrial processes and it is a valuable chemical product for using with a variety of purposes and its can be eliminated in several ways, including ammonium nitrate production industry, livestock feedlots, urea manufacture plants, nitrogen fertilizer application industry, biomass combustion or petroleum refineries, and refrigeration industry, which are either toxic inorganic gaseous and its pungent malodorous component under ambient conditions or have the potential harmful effects on the public. More recently, catalytic oxidation has been known to enhance the possibilities of the advanced oxidation processes technology through the use of dedicated catalysts, which can potentially promote oxidation in shorter reaction times under milder operating conditions. The selective catalytic oxidation （SCO） for ammonia-containing stream to molecular nitrogen and water is one way to solve ammonia pollution problems. Moreover, the kinetic behavior of NH3 oxidation with catalysis can be accounted by using the rate expression of the kinetic model. Kinetic parameters are also developed on the basis of the differential reactor data in this study. Figure 1 presents the textural characteristics by STEM- EDX of the cordierite catalyst. Morphology of the catalysts with STEM, combined with EDX analysis, indicates that nanometal composite were well dispersed on the cordierite support surface overall. To further identify the chemical properties of the PtPdRh cordierite catalyst, Figure 2 presents UV-Vis spectra and thus provides further information on the states of platinum and rhodium species in these catalysts. The bands associated with such octahedral platinum （IV） species were observed in the ranges 325-350 nm. The band at 325-350 nm corresponds to d-d transitions. No rhodium-containing species are detected by UV-Vis. These results indicate that rhodium may exist in a highly dispersed form. Moreover, a kinetic rate expression was developed to describe

关键词： Ammonia Biomass PtPdRh Cordierite Catalyst Kinetic Model.

来源： cnki会议 cnki会议评论

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China & World Economy 2025年第1期33卷 36-63页

作者： mao Zhou Jiahui Wu Xia Wang chang Liu School of International Business Southwestern University of Finance and Economics(SWUFE)China School of International Business SWUFEChina School of Public Finance and Taxation SWUFEChina Institute of Western China Economic Research SWUFEChina

Electrification is crucial for achieving global net zero emissions and reducing energy poverty, particularly in developing countries involved in the Belt and Road Initiative (BRI). This study uses the difference-in-differences method to examine the BRI's impact on electrification levels in 118 countries from 2009 to 2020. Its findings indicate that the BRI increased electrification in BRI countries by approximately 1 percent compared with non-BRI countries. This increase was driven primarily by enhanced trade and investments, which facilitated imports of power equipment and supported China-backed power-plant projects. The BRI's impact was more pronounced in Maritime Silk Road countries, high-income nations, and those with favorable business environments. Although the BRI promoted both renewable and nonrenewable power equipment imports, it primarily favored nonrenewable infrastructure investments. Given China's expertise in clean energy, there remains untapped potential for the BRI to prioritize renewable energy integration, fostering a sustainable and low-carbon future.

关键词： Belt and Road Initiative electrification level power equipment import.power plant investment

MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑Powered Motion Sensing

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Nano-Micro Letters 2025年第3期17卷 265-279页

作者： Yu‑Ze Wang Yu‑chang Wang Ting‑Ting Liu Quan‑Liang Zhao Chen‑Sha Li mao‑Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

Polymeric microwave actuators combining tissue-like softness with programmablemicrowave-responsive deformation hold great promise for mobile intelligentdevices and bionic soft robots. However, their application is challenged by restricted electromagneticsensitivity and intricate sensing coupling. In this study, a sensitized polymericmicrowave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx(MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique spacechargepolarization and interfacial polarization, resulting in significant improvements of230% in the dielectric loss factor and 830% in the apparent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresponse time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (upto 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combinesdriving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of ~ 3 mV) duringactuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approachfor developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

Effect of initial microstructure on microstructure evolution and mechanical properties of 0.12C martensitic steels during quenching and tempering

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Journal of Iron and Steel Research International 2025年第1期32卷 260-269页

作者： Ya-ru Wang Zi-yong Hou He Yang Jun Zhao Zhi-yuan chang Fan-mao Meng Ling Zhang Gui-lin Wu Xiao-xu Huang State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization Panzhihua 617000SichuanChina State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Institute of Steel Technology for Automobile and Household Appliance Pangang Group Co.Ltd.Panzhihua 617000SichuanChina ATB Motor(Shanghai)Co. Ltd.Keen International CenterShanghai 200041China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The microstructure evolution and mechanical properties of a Fe-0.12C-0.2Si-1.6Mn-0.3Cr-0.0025B(wt.%)steel with different initial microstructures,i.e.,hot rolled(HR)and cold rolled-annealed(CRA),were studied through optical microscopy,scanning electron microscopy,electron channeling contrast imaging,microhardness and room temperature uniaxial tensile *** water quenching from 930℃ to room temperature,a fully martensitic microstructure was obtained in both as-quenched HR and CRA specimens,which shows a microhardness of 480±5 HV,and no significant difference in microstructure and microhardness was *** test results show that the product of tensile strength and total elongation(UTS×TE)of the as-quenched HR specimen,i.e.,24.1 GPa%,is higher than that of the as-quenched CRA specimen,i.e.,18.9 GPa%.While,after being tempered at 300℃,the martensitic microstructures and mechanical properties of the two as-quenched specimens change significantly due to the synergy role of the matrix phase softening and the precipitation *** the maximum UTS×TE,it is 18.9 GPa%obtained in the as-quenched CRA one,while that is 24.4 GPa%obtained in the HR specimen after tempered at 300℃ for 5 min.

关键词： Initial microstructure Lath martensite Quenching Tempering Mechanical property

Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

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Science China Chemistry 2025年第1期68卷 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen chang Hong-Yu Tang Chun-mao Yuan Jun-Bo Yang Zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng Yun-Dong Wu Xiao-Jiang Hao Key Laboratory of Phytochemistry and Natural Medicines(Chinese Academy of Sciences) Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical OncogenomicsPeking University Shenzhen Graduate SchoolShenzhen 518055China Shenzhen Bay Laboratory Shenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Microbial Metabolism School of Life Sciences&BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical UniversityGuiyang 550014China Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest ChinaKunming Institute of BotanyChinese Academy of SciencesKunming 650201China Yunnan Key Laboratory for Wild Plant Resources Kunming Institute of BotanyChinese Academy of SciencesKunming 650201China Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical SciencesBeijing 100730China

In the intricate process of natural product biosynthesis,a metabolon can enhance metabolic flux by associating sequential enzymes.A fungal metabolon,comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G,is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide *** notoamide E as a substance,Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation,followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium ***,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol *** provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

关键词： metabolon Diels-Alder reaction semipinacol rearrangement biosynthesis notoamides spiro polycyclic alkaloids

热塑性聚氨酯基杂化纳米复合材料的导电和拉伸应变传感性能

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高分子学报 2025年第1期56卷 124-134页

作者：闫茂昌黄汉雄华南理工大学广东省高分子先进制造技术及装备重点实验室微/纳成型与流变学研究室广州510640

采用湿法刻蚀MAX相的方法,制备了少层二维过渡金属碳化物(MXene)纳米片;采用溶液混合和模压成型制备不同碳纳米管(CNT)、MXene和杂化CNT/MXene含量的热塑性聚氨酯(TPU)基纳米复合材料.结果表明,杂化CNT/MXene有效提高了纳米复合材料的... 详细信息

采用湿法刻蚀MAX相的方法,制备了少层二维过渡金属碳化物(MXene)纳米片;采用溶液混合和模压成型制备不同碳纳米管(CNT)、MXene和杂化CNT/MXene含量的热塑性聚氨酯(TPU)基纳米复合材料.结果表明,杂化CNT/MXene有效提高了纳米复合材料的导电性能,MXene含量从0.2 wt%增加至0.4 wt%使TPU/CNT(0.8 wt%)纳米复合材料的电导率提高5个数量级.扫描电镜观测和流变性能测试结果表明,这归因于TPU内杂化CNT/MXene形成了良好的导电网络.对具有较高导电率的4种TPU/CNT/MXene纳米复合材料(即CNT含量固定为0.8 wt%、MXene含量为0.4 wt%~1.0 wt%)的拉伸应变传感性能进行对比研究.有意义的是,发现MXene含量为0.8 wt%的纳米复合材料呈现更高的应变传感性能,其应变因子最高为7.5.该纳米复合材料在不同的循环拉伸/释放测试中表现良好的响应和恢复性能、较高的循环响应稳定性和重复性,且能准确检测手指弯曲、手腕弯曲和低头这些人体运动产生的电阻信号.研究表明,采用杂化CNT/MXene并选择合适的含量,在聚合物基体内形成良好的导电网络,可明显提高纳米复合材料的导电和拉伸应变传感性能.

关键词：热塑性聚氨酯基纳米复合材料二维过渡金属碳化物导电性能拉伸应变传感流变行为

河北省未来30年人口规模结构预测及发展策略研究

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经济论坛 2025年第1期 5-16页

作者：李茂常思琳河北省社会科学院省情研究所河北石家庄050051

科学预测未来人口变化趋势及其相关经济社会影响,是积极调整宏观、微观政策,有效应对人口变化挑战的重要依据。文章基于第七次全国人口普查数据,采用队列要素法,并使用PADIS-INT软件建立模型,设置低、中、高三种方案,对河北省2021—205... 详细信息

科学预测未来人口变化趋势及其相关经济社会影响,是积极调整宏观、微观政策,有效应对人口变化挑战的重要依据。文章基于第七次全国人口普查数据,采用队列要素法,并使用PADIS-INT软件建立模型,设置低、中、高三种方案,对河北省2021—2050年人口规模和结构进行预测。就预测结果看,未来河北省人口负增长趋势已成必然且形势严峻。在三种方案下,到2050年,河北省总人口分别为6414.12万人、6903.77万人和7100.77万人,均为持续下降态势;育龄妇女规模将不足总人口的20%,也呈缓慢减少趋势;劳动人口分别为3780.64万人、3958.71万人和4029.94万人,都呈现持续萎缩态势;而总抚养比将达到69.66%、74.40%和76.20%,社会的整体抚养压力将持续增加;学龄人口也将持续减少,各类教育资源面临优化整合。因此,应积极系统应对人口负增长趋势,尽快优化鼓励生育的政策措施,积极构建生育友好型社会,并持续深入研究人口负增长带来的长期综合性影响,以有效应对人口负增长带来的社会问题。

关键词：河北省人口规模结构预测生育水平队列要素法

A New Parameter Extraction Method for Schottky Barrier Diodes

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Chinese Journal of Electronics 2019年第3期28卷 497-502页

作者： chang Yongming mao Wei HAO Yue State Key Discipline Laboratory of Wide Band Gap Semiconductor Technologies Department of MicroelectronicsXidian University

A new parameter extraction method for Schottky barrier diodes is provided in this *** the current model of Schottky barrier diodes is a nonlinear self-consistent equation, the nonlinear inconsistent equations set is composed of nonlinear model equations under different biases. The problem of solving nonlinear inconsistent equations set is transformed into an optimization problem. The global optimal solution of the parameters is obtained by genetic algorithm. Comparing with experimental data, the results indicate that the error of the method proposed by this paper is lower than that of Cheung method.

关键词： Schottky barrier diodes Parameter extraction Genetic algorithm