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One-pot synthesis of bimetallic CeCu-SAPO-34 for high-efficiency selective catalytic reduction of nitrogen oxides with NH_(3) at low temperature

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Chinese Journal of Chemical Engineering 2023年第4期56卷 193-202页

作者： Shuang Qiu Yonghou xiao Haoran wu Shengnan Lu Qidong Zhao Gaohong He Panjin Institute of Industrial Technology Liaoning Key Laboratory of Chemical Additive Synthesis and SeparationDalian University of TechnologyPanjin 124221China State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyPanjin 124221China School of Petrochemical Engineering Shenyang University of TechnologyLiaoyang 111003China

NH_(3) selective catalytic reduction(SCR) has been widely recognized as a promising technique for reducing nitrogen oxides from diesel vehicle exhausts. High-efficiency SCR catalysts that could perform at low temperatures are essential to denitration. In this work, a series of bimetallic CeCu-SAPO-34 molecular sieves were synthesized by one-step hydrothermal method. The Ce Cu-SAPO-34 maintained good crystallinity and a regular hexahedron appearance of Cu-SAPO-34 after introducing Ce species, while exhibiting a higher specific surface area and pore volume. The as-prepared CeCu-SAPO-34 with 0.02%(mass) Ce constituent exhibited the best catalytic activity below 300℃ and a maximum NO_(x) conversion of 99% was attained;the NO_(x) removal rates of more than 68% and 94% were achieved at 150℃ and 200℃, respectively. And the introduction of cerium species in Cu-SAPO-34 improves the low-temperature hydrothermal stability of the catalyst towards NH_(3)-SCR reaction. Additionally, the introduced Ce species could enhance the formation of abundant weak Br?nsted acid centers and promote the synergistic effect between CuO grains and isolated Cu^(2+) to enhance the redox cycle, which benefit the NH_(3)-SCR *** work provides a facile synthesis method of high-efficiency SCR denitration catalysts towards diesel vehicles exhaust treatment under low temperature.

关键词： CeCu-SAPO-34 Selective catalytic reduction(SCR) Low temperature DeNO_(x) One-pot synthesis

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液冷机箱散热性能数值研究

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机电元件 2024年第1期44卷 48-50,63页

作者：张晓彤张营姜睿智青春沈阳兴华航空电器有限责任公司辽宁沈阳110144

随着机载电子设备向高热流密度、集成化和模块化发展,对机箱的散热性能要求也越来越高。数值仿真分析能够较为真实的模拟系统的热情况,确定产品的温度分布,不仅有利于验证设计合理性并可根据计算分析结果进行优化改进。本文基于数值仿... 详细信息

随着机载电子设备向高热流密度、集成化和模块化发展,对机箱的散热性能要求也越来越高。数值仿真分析能够较为真实的模拟系统的热情况,确定产品的温度分布,不仅有利于验证设计合理性并可根据计算分析结果进行优化改进。本文基于数值仿真分析方法,对机箱散热性能进行分析,同时研究了接触热阻,均温板、环境温度等因素对机箱散热效果的影响。

关键词：热仿真液冷机箱散热性能均温板

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水平带式过滤机真空系统优化改进

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石油化工设备 2024年第5期53卷 76-80页

作者：吴贞王文智裴永稚李海申玉营中国石油兰州石化公司甘肃兰州730060

水平带式过滤机是制备分子筛的关键过程设备,主要用于分子筛浆液的固液分离,同时实现离子的相互交换。针对水平带式过滤机现有真空系统存在的操作复杂、离心泵故障频繁、环境噪声大等问题,通过翼阀直径核算、真空蝶阀移位、缓冲接液罐... 详细信息

水平带式过滤机是制备分子筛的关键过程设备,主要用于分子筛浆液的固液分离,同时实现离子的相互交换。针对水平带式过滤机现有真空系统存在的操作复杂、离心泵故障频繁、环境噪声大等问题,通过翼阀直径核算、真空蝶阀移位、缓冲接液罐体积核算、重力流管道直径核算进行优化设计并对系统实施改造,解决了实际问题,改善了生产操作环境,提高了真空系统自控稳定性。

关键词：过滤机真空系统水平带式优化

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Nucleation Analysis of Variant Transformed from Austenite with Σ_(3) Boundary in High-Strength Low-Alloy Steel

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Acta Metallurgica Sinica(English Letters) 2021年第4期34卷 523-533页

作者： Bin-Bin wu zhi-Quan Wang Cheng-Jia Shang Yi-Shuang Yu Devesh Misra Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing100083China State Key Laboratory of Metal Material for Marine Equipment and Application Anshan114000China Laboratory for Excellence in Advanced Steel Research Department of MetallurgicalMaterials and Biomedical EngineeringUniversity of Texas at El Paso500 WUniversity AvenueEl PasoTX79968USA

We elucidate here the effects of annealing twins on phase transformation products based on electron back-scatter diffraction analysis and corresponding microstructure visualization and quantification *** and bainite were obtained by rapid continuous cooling and isothermal processing at different temperatures,respectively,which were designed to study variants formed in austenite with Σ_(3) *** isothermal transformation near martensite start(M_(s))temperature was most conducive in obtaining the highest content of twin-related V_(1)/V_(2) variant *** on the classical nucleation theory of martensite and bainite,respectively,the role of austenite Σ_(3) boundary in martensite and bainite transformation is illustrated.

关键词： Steel AusteniteΣ_(3)boundary Variant Phase transformation Martensite Bainite

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Simultaneous measurement-device-independent continuous variable quantum key distribution with realistic detector compensation

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Frontiers of physics 2020年第3期15卷 1-12页

作者： xiao-Dong wu Yi-Jun Wang Duan Huang Ying Guo School of Automation Central South UniversityChangsha410083China School of Computer Science and Engineering Central South UniversityChangsha410083China

We propose a novel scheme for measurement-device-independent(MDI)continuous-variable quantum key distribution(CVQKD)by simultaneously conducting classical communication and QKD,which is called“simultaneous MDI-CVQKD”*** such protocol,each sender(Alice,Bob)can superimpose random numbers for QKD on classical information by taking advantage of the same weak coherent pulse and an untrusted third party(Charlie)decodes it by using the same coherent detectors,which could be appealing in practice due to that multiple purposes can be realized by employing only single communication *** is more,the proposed protocol is MDI,which is immune to all possible side-channel attacks on practical *** results illustrate that the simultaneous MDI-CVQKD protocol can secure against arbitrary collective *** addition,we employ phase-sensitive optical amplifiers to compensate the imperfection existing in practical *** this technology,even common practical detectors can be used for detection through choosing a suitable optical amplifier ***,we also take the finite-size effect into consideration and show that the whole raw keys can be taken advantage of to generate the final secret key instead of sacrificing part of them for parameter ***,an enhanced performance of the simultaneous MDI-CVQKD protocol can be obtained in finite-size regime.

关键词： measurement-device-independent continuous-variable quantum key distribution simultaneous realistic detector compensation

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An experiment evaluating how the tiny mass eccentricities in spinstabilized projectiles affect the position of impact points

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Defence Technology（防务技术） 2021年第3期17卷 948-960页

作者： Chuan-lin Chen Hui Xu Chen-lei Huang Zhong-xin Li zhi-lin wu School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingJiangsu210094China

This study investigates and quantifies some possible sources affecting the position of impact points of small caliber spin-stabilized projectiles(such as 12.7 mm bullets).A comparative experiment utilizing the control variable method was designed to figure out the influence of tiny eccentric centroids on the *** study critically analyzes data obtained from characteristic parameter measurements and precision *** also combines Sobol’s algorithm with an artificial intelligence algorithmdAdaptive Neuro-Fuzzy Inference Systems(ANFIS)ein order to conduct global sensitivity analysis and determine which parameters were most *** results indicate that the impact points of projectiles with an entry angle of 0°deflected to the left to that of projectiles with an entry angle of 90°.The difference of the mean coordinates of impact points was about 12.61 cm at a target range of 200 *** analysis indicated that the entry *** initial position of mass eccentricityehad a notable *** global sensitivity analysis,the significance of the effect of mass eccentricity was confirmed again and the most influential factors were determined to be the axial moment and transverse moment of inertia(Izz Iyy),the mass of a projectile(m),the distance between nose and center of mass along the symmetry axis for a projectile(Lm),and the eccentric distance of the centroid(Lr).The results imply that the control scheme by means of modifying mass center(moving mass or mass eccentricity)is promising for designing small-caliber spin-stabilized projectiles.

关键词： Tiny mass eccentricity Small-caliber projectile Bullet Artificial intelligence algorithm Global sensitivity analyses Precision trials ANFIS Sobol’s algorithm

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响应面法优化低共熔溶剂提取紫椴花总黄酮工艺及抗氧化活性研究

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食品与药品 2024年第3期26卷 193-199页

作者：高婧王志轩冯超曹晓宇河北省燕山地区道地药材检验检测技术创新中心河北承德067000 承德市食品药品检验检测中心河北承德067000

目的通过合成不同类型的低共熔溶剂,考察其对紫椴花中黄酮类化合物提取率的影响并优化其工艺,并对其总黄酮的抗氧化活性进行研究。方法在单因素实验基础上,选取对紫椴花总黄酮提取率影响较大的因素,采用响应面试验设计方法,建立以超声... 详细信息

目的通过合成不同类型的低共熔溶剂,考察其对紫椴花中黄酮类化合物提取率的影响并优化其工艺,并对其总黄酮的抗氧化活性进行研究。方法在单因素实验基础上,选取对紫椴花总黄酮提取率影响较大的因素,采用响应面试验设计方法,建立以超声功率、超声时间、溶剂含水量为自变量,紫椴花总黄酮提取率为因变量的二次回归模型。根据紫椴花总黄酮对ABTS自由基和DPPH自由基的清除效果判断其体外抗氧化能力。结果紫椴花总黄酮的提取最优条件为氯化胆碱-乳酸(摩尔比1:2),超声功率200 W,提取时间30 min,含水量为50%。在此条件下,具有最高的提取率(10.61%)。紫椴花总黄酮对ABTS自由基、DPPH自由基清除率分别为93.27%和90.85%,IC_(50)值分别为0.021和0.0045 mg/ml,具有较好的抗氧化能力。结论利用响应面法优化紫椴花总黄酮的提取工艺,建立了模拟回归方程,可用于提取工艺的参数优化。抗氧化实验结果表明,紫椴花总黄酮有较好的体外抗氧化活性,可用于开发新的抗氧化药物。

关键词：低共熔溶剂紫椴花工艺优化总黄酮抗氧化

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A flexible electrode array for determining regions of motor function activated by epidural spinal cord stimulation in rats with spinal cord injury

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Neural Regeneration Research 2022年第3期17卷 601-607页

作者： Guang-Wei Mao Jian-Jun Zhang Hao Su zhi-Jun Zhou Lin-Sen Zhu xiao-Ying Lü zhi-Gong Wang State Key Laboratory of Bioelectronics Southeast UniversityNanjingJiangsu ProvinceChina Institute of RF-&OE-ICs Southeast UniversityNanjingJiangsu ProvinceChina Co-innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina

Epidural stimulation of the spinal cord is a promising technique for the recovery of motor function after spinal cord *** key challenges within the reconstruction of motor function for paralyzed limbs are the precise control of sites and parameters of *** activate lower-limb muscles precisely by epidural spinal cord stimulation,we proposed a high-density,flexible electrode *** determined the regions of motor function that were activated upon epidural stimulation of the spinal cord in a rat model with complete spinal cord,which was established by a transection *** evaluating the effect of stimulation,the evoked potentials were recorded from bilateral lowerlimb muscles,including the vastus lateralis,semitendinosus,tibialis anterior,and medial *** determine the appropriate stimulation sites and parameters of the lower muscles,the stimulation characteristics were studied within the regions in which motor function was activated upon spinal cord *** the vastus lateralis and medial gastrocnemius,these regions were symmetrically located at the lateral site of L1 and the medial site of L2 vertebrae segment,*** tibialis anterior and semitendinosus only responded to stimulation simultaneously with other *** minimum and maximum stimulation threshold currents of the vastus lateralis were higher than those of the medial *** results demonstrate the ability to identify specific stimulation sites of lower muscles using a high-density and flexible *** also provide a reference for selecting the appropriate conditions for implantable stimulation for animal models of spinal cord *** study was approved by the Animal Research Committee of Southeast University,China(approval No.20190720001) on July 20,2019.

关键词： electrode array epidural spinal cord stimulation evoked potentials motor function rehabilitation spinal cord injury spinal segment

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线路复合绝缘子憎水性及金具腐蚀特征提取方法

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合成材料老化与应用 2024年第5期53卷 36-39页

作者：郭利瑞吴驰雷潇周舟国网四川省电力公司国网四川省电力公司电力科学研究院湖北大学微电子学院

采用结构光检测的傅里叶变换轮廓术，来重构表面的三维形貌形态特征，进而获得导地线复合绝缘子老化及金具腐蚀状态。结果表明：（1）分析复合绝缘子材料表面情况，通过统计分析水珠情况，可以自动获得憎水性等级，进而可以提取老化程... 详细信息

采用结构光检测的傅里叶变换轮廓术，来重构表面的三维形貌形态特征，进而获得导地线复合绝缘子老化及金具腐蚀状态。结果表明：（1）分析复合绝缘子材料表面情况，通过统计分析水珠情况，可以自动获得憎水性等级，进而可以提取老化程度；（2）分析金具腐蚀情况，获得对应的锈蚀金具局部三维形貌图并进行曲面拟合后可以得到分析区域的均方根误差，当区域均方根误差大于0.1mm时，锈蚀较为严重。根据该方法可有效建立以表面三维特征来获取线路复合绝缘子憎水性及金具腐蚀特征的模型，可以精准辨识线路绝缘子的运行健康状况。

关键词：线路复合绝缘子材料老化金具腐蚀结构光检测特征参数

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Transition metal decorated bismuthene for ammonia synthesis:A density functional theory study

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Chinese Chemical Letters 2023年第6期34卷 497-503页

作者： Jing wu Lei Yang Xin Liu Beibei xiao zhimin Ao School of Energy and Power Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemistry and Chemical Engineering Institute for Computation in Molecular and Materials ScienceNanjing University of Science and TechnologyNanjing 210094China Institut Charles Gerhardt Montpellier UMR-5253Universitéde MontpellierCNRSENSCMPlace E.BataillonCedex 05Montpellier 34095France Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal UniversityZhuhai 519087China

The electrochemical nitrogen reduction reaction(NRR)for the ammonia production under ambient conditions is regarded as a sustainable alternative to the industrial Haber-Bosch ***,the electrocatalytic systems that efficiently catalyze nitrogen reduction remain *** the work,the nitrogen reduction activity of the transition metal decorated bismuthene TM@Bis is fully investigated by means of density functional theory *** results demonstrate that W@Bis delivers the best efficiency,wherein the potential-determining step is located at the last protonation step of^(*)NH_(2)+H^(+)+e^(-)→*NH_(3)via the distal mechanism with the limiting potential ULof 0.26 ***,the dopants of Re and Os are also promising candidates for experimental synthesis due to its good selectivity,in despite of the slightly higher ULof NRR with the value of 0.55 ***,the candidates of Ti,V,Nb and Mo delivered the relative lower ULof 0.35,0.37,0.41 and 0.43 V might be suffered from the side hydrogen evolution *** interestingly,a volcano curve is established between ULand valence electrons of metal elements wherein W with 4 electrons in d band located at the *** phenomenon originates from the underlying acceptance-back donation ***,our work provides a fundament understanding for the material design for nitrogen reduction electrocatalysis.

关键词： Nitrogen reduction reaction Density functional theory Bismuthene Thermodynamic Electrocatalysts

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