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Effect of samarium on the N_(2) selectivity of Sm_(x)Mn_(0.3-x)Ti catalysts during selective catalytic reduction of NO_(x) with NH_(3)

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 642-652页

作者： Shengyang Zhang Bolin Zhang boyu wu Bo Liu Shengen Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China

This work aims to study the improvement effect of Sm on Mn-based catalysts for selective catalytic reduction (SCR) of NO with NH3.A series of Sm_(x)Mn_(0.3-x)-xTi catalysts (x=0,0.1,0.15,0.2,and 0.3) were prepared by *** tests indicated that the Sm_(0.15)Mn_(0.15)Ti catalyst showed superior performances,with a NO conversion of 100%and N_(2)selectivity above 87%at 180–300℃.The characterizations showed that Sm doping suppressed the crystallization of TiO_(2)and Mn2O3phases and increased the specific surface area and *** particular,the surface area increased from 152.2 m^(2)·g^(-1)for Mn0.3Ti to 241.7 m^(2)·g^(-1)for Sm_(0.15)Mn_(0.15)*** effects contributed to the high catalytic *** X-ray photoelectron spectroscopy (XPS) results indicated that the relative atomic ratios of Sm^(3+)/Sm and Oβ/O of Sm_(0.15)Mn_(0.15)Ti were 76.77at%and 44.11at%,*** presence of Sm contributed to an increase in surface-absorbed oxygen (Oβ) and a decrease in Mn^(4+)surface concentration,which improved the catalytic *** the results of hydrogen temperature-programmed reduction(H_(2)-TPR),the presence of Sm induced a higher reduction temperature and lower H_(2)consumption (0.3 mmol·g^(-1)) for the Sm_(0.15)Mn_(0.15)Ti catalyst compared to the Mn0.3Ti *** decrease in Mn^(4+)weakened the redox property of the catalysts and increased the N_(2)selectivity by suppressing N_(2)O formation from NH3oxidation and the nonselective catalytic reduction *** in situ diffuse reflectance infrared Fourier transform spectra (DRIFTs) revealed that NH3-SCR of NO over the Sm_(0.15)Mn_(0.15)Ti catalyst mainly followed the Eley–Rideal *** doping increased surface-absorbed oxygen and weakened the redox property to improve the NO conversion and N_(2)selectivity of the Sm_(0.15)Mn_(0.15)Ti catalyst.

关键词： manganese oxides nitric oxide nitrous oxide samarium selective catalytic reduction nitrogen selectivity

产香云芝菌丝体的培养条件优化及其挥发性成分分析

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西南林业大学学报（自然科学） 2024年第5期44卷 207-214页

作者：吴博宇鲁斌尹文行萧卫泓王玮严冬赵平西南林业大学西南地区林业生物质资源高效利用国家林业和草原局重点实验室云南昆明650233 西南林业大学西南山地森林资源保育与利用教育部重点实验室云南昆明650233 高黎贡山国家级自然保护区泸水管护分局云南怒江673200

为获得云芝菌丝体最佳产香培养条件和其挥发性成分,采用单因素试验法考察了不同碳源、氮源、pH值、培养基体积、培养温度、培养时间对云芝菌丝体产生挥发性成分的影响,通过响应面法优化其培养条件,并结合气相色谱-质谱联用法对云芝菌丝... 详细信息

为获得云芝菌丝体最佳产香培养条件和其挥发性成分,采用单因素试验法考察了不同碳源、氮源、pH值、培养基体积、培养温度、培养时间对云芝菌丝体产生挥发性成分的影响,通过响应面法优化其培养条件,并结合气相色谱-质谱联用法对云芝菌丝体挥发性成分进行分析。结果表明:培养基体积、培养时间、培养温度对云芝菌丝体挥发性成分具有显著影响,最佳培养条件为以蔗糖为碳源、不添加氮源、培养基体积120 mL、培养温度27.5℃、培养时间27 d,在此条件下验证试验结果与理论预测的误差为0.315%。从云芝菌丝体中共检测出6种挥发性成分,包括脂肪醇类3种、芳香族类1种、倍半萜烯类2种,其中1-表双环倍半水芹烯和(E)-菖蒲烯为主要成分,相对含量分别为29.96%和29.17%,为云芝菌丝体在微生物香料的进一步开发应用提供科学依据。

关键词：云芝菌丝体顶空固相微萃取响应面法产香真菌气相色谱-质谱

Extraction algorithm for longitudinal and transverse mechanical information of AFM

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Nanotechnology and Precision Engineering 2022年第2期5卷 27-37页

作者： Chunxue Hao Shoujin Wang Shuai Yuan boyu wu Peng Yu Jialin Shi School of Information and Control Engineering Shenyang Jianzhu UniversityShenyang 110168China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Institute of Robotics and Intelligent Manufacturing Innovation Chinese Academy of SciencesShenyang 110169China

The atomic force microscope(AFM)can measure nanoscale morphology and mechanical properties and has a wide range of *** traditional method for measuring the mechanical properties of a sample does so for the longitudinal and transverse properties separately,ignoring the coupling between *** this paper,a data processing and multidimensional mechanical information extraction algorithm for the composite mode of peak force tapping and torsional resonance is *** the basis of a tip–sample interaction model for the AFM,longitudinal peak force data are used to decouple amplitude and phase data of transverse torsional resonance,accurately identify the tip–sample longitudinal contact force in each peak force cycle,and synchronously obtain the corresponding characteristic images of the transverse amplitude and *** results show that the measured longitudinal mechanical characteristics are consistent with the transverse amplitude and phase characteristics,which verifies the effectiveness of the ***,a new method is provided for the measurement of multidimensional mechanical characteristics using the AFM.

关键词： Atomic force microscope Peak force tapping Torsional resonance Mechanical characteristic measurement Background subtraction algorithm Coupled mechanical model

Ultra-Broad-Band LiNbO3 Electro-Optic Modulators with Novel Complex Electrode

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Chinese Journal of Lasers 2000年第2期9卷 128-133页

作者： ZHOU Weiqin wu boyu PENG Jihu GU Jinghua HU Jinyang (Department of Electronic Engineering, Tsinghua University, Beijing 100084, China) 清华大学北京 100084

The characteristics of Z- cut LiNbO3optical modulators with novel complex electrode are discussed by using the finite element method （FEM） and studied experimentally in this paper. The travelling wave electrode consists of upper and lower parts. It can easily realize phase velocity matching between microwave and optical wave and drastically reduce microwave electrode loss. An electrooptic modulator with larger than 100 GHz bandwidth and half wave voltage 6 V is designed, fabricated and measured. Vπis 5. 1 V and the attenuation coefficient ac is 0. 3 dB/(cm· GHz1/2). The experimental results show that the modulator has great potentiality for expanding bandwidth.

关键词： electro-optic medulator LiNbO3 modulator travelling wave electrode complex electrode

Permeable and robust polymer-silica hybrid armor on cell catalyst for sustainable biomanufacturing

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Particuology 2024年第9期92卷 106-112页

作者： Yiran Cheng Zhenhua wu boyu Zhang Jiaxu Zhang Jiafu Shi Zhongyi Jiang School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

Inactivated cell catalysis is one of several central techniques in green biomanufacturing ***,the instability and leakage of enzymes in inactivated cell severely restrict the practical applications of inactivated cell *** armor on the surface of inactivated cells affords a feasible and effective strategy to enhance the stability of cells while commonly lowering the ***,polymer-silica hybrid armor(PSHA)is directly generated on the surface of enzyme-containing *** branched structure of PEI enables higher porosity of cell@PSHA,exhibiting 1.52-fold enhancement in substrate permeability by contrast with cell@silica armor(SA).The electrostatic interactions(NH_(3)^(+)with O^(−))and hydrogen bonding(N⋯H or O⋯H)interactions between structural units enables higher stability of cell@PSHA,showing 3.13-fold elevation in Young's modulus compared with cell@*** a result,the cell@PSHA can catalyze continuous conversion of starch to tagatose for 15 batches over 969 h,with an average yield of 77.76 g L^(−1).

关键词： Biomanufacturing Wholecell catalysis Polymer-silica hybrid armor Tagatose production Starch conversion

微小RNA-19a通过第一凋亡信号及其配体信号通路促进骨关节炎软骨细胞增殖的机制

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中华实验外科杂志 2024年第8期41卷 1780-1783页

作者：吴博宇肖文杰刘红翔朱颖朱思源范志海苏州大学附属第二医院骨科苏州215000

目的探讨微小RNA-19a(miR-19a)通过调控第一凋亡信号/第一凋亡信号配体(Fas/FasL)通路对骨关节炎(OA)软骨细胞增殖和凋亡的影响。方法体外培养人正常软骨细胞及OA软骨细胞,实时荧光定量聚合酶链反应(RT-qPCR)法检测细胞中miR-19a表达。... 详细信息

目的探讨微小RNA-19a(miR-19a)通过调控第一凋亡信号/第一凋亡信号配体(Fas/FasL)通路对骨关节炎(OA)软骨细胞增殖和凋亡的影响。方法体外培养人正常软骨细胞及OA软骨细胞,实时荧光定量聚合酶链反应(RT-qPCR)法检测细胞中miR-19a表达。将OA软骨细胞分为对照组、miR-19a阴性对照(NC)组、miR-19a模拟物(mimics)组、miR-19a mimics+空载质粒(pcDNA)组和miR-19a mimics+Fas过表达质粒(Fas)组。RT-qPCR法检测各组细胞miR-19a、第一凋亡信号(Fas)、Fas配体(FasL)的mRNA表达;噻唑蓝(MTT)法检测各组OA软骨细胞增殖;流式细胞术分析细胞凋亡;免疫印迹法测定增殖、凋亡相关蛋白及Fas、FasL蛋白表达;双荧光素酶实验测定miR-19a与Fas的相互作用,以t检验和单因素方差分析(ANOVA)进行组间比较。结果OA软骨细胞组miR-19a的表达水平显著低于正常软骨细胞组(0.45±0.06比1.01±0.19,t=2.95,P<0.05)。增加miR-19a表达的miR-19a mimics组Fas和FasL表达显著低于miR-19a NC组(Fas:0.31±0.05比0.93±0.09,t=15.78,P<0.05;FasL:0.37±0.04比0.87±0.10,t=11.43,P<0.05),miR-19a mimics组细胞增殖显著高于miR-19a NC组(A值:0.66±0.07比0.45±0.05,t=8.70,P<0.05),miR-19a mimics组细胞凋亡率显著低于miR-19a NC组[(8.57±1.65)%比(22.45±2.66)%,t=12.02,P<0.05]。结论miR-19a可通过靶向抑制Fas/FasL信号通路,促进OA软骨细胞增殖,抑制细胞凋亡。

关键词：微小RNA 第一凋亡信号/第一凋亡信号配体通路骨关节炎软骨细胞增殖凋亡

Dendrimer-induced synthesis of porous organosilica capsules for enzyme encapsulation

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Frontiers of Chemical Science and Engineering 2024年第4期18卷 41-48页

作者： Ziyi Chu boyu Zhang Zhenhua wu Jiaxu Zhang Yiran Cheng Xueying Wang Jiafu Shi Zhongyi Jiang School of Environmental Science&Engineering Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Organic matter-induced mineralization is a green and versatile method for synthesizing hybrid nanostructured materials,where the material properties are mainly influenced by the species of natural biomolecules,linear synthetic polymer,or small molecules,limiting their ***,we adopted dendrimer poly(amidoamine)(PAMAM)as the inducer to synthesize organosilica-PAMAM network(OSPN)capsules for mannose isomerase(MIase)encapsulation based on a hard-templating *** structure of OSPN capsules can be precisely regulated by adjusting the molecular weight and concentration of PAMAM,thereby demonstrating a substantial impact on the kinetic behavior of the MIase@OSPN *** MIase@OSPN system was used for catalytic production of mannose from Dfructose.A mannose yield of 22.24% was obtained,which is higher than that of MIase in organosilica network capsules and similar to that of the free *** overall catalytic efficiency(kcat/Km)of the MIase@OSPN system for the substrate D-fructose was up to 0.556 s^(-1)·mmol^(-1)·***,the MIase@OSPN system showed excellent stability and recyclability,maintaining more than 50% of the yield even after 12 cycles.

关键词： enzyme immobilization enzyme catalysis organosilica networks capsules sugar biosynthesis

Low-temperature-pyrolysis preparation of nanostructured graphite towards rapid potassium storage with high initial Coulombic efficiency

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Nano Research 2024年第6期17卷 5138-5147页

作者： Jingke Ren boyu Xing Wen Luo Binyang Luo Xinfei wu Xin Yan Wencong Feng Feiyue Wang Chaojie Cheng Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan 430070China

Industrially prepared artificial graphite(AG)is attractive for potassium-ion batteries(PIBs),but its rate performance is poor and the production process is energy intensive,so developing an efficient strategy to produce novel graphite with low energy consumption and high performance is economically ***,a nanostructured graphite composed of multi-walled carbon nanotubes(MWCNTs)and graphite shells was prepared by one-pot method through low-temperature pyrolysis of iron-based metal-organic framework(MOF)and carbon *** high graphitization degree of nanostructured graphite makes the initial Coulombic efficiency(ICE)exceed 80%,and the three-dimensional(3D)conductive network ensures a specific capacity of 234 mAh·g^(−1)after 1000 cycles at a high current density of 500 mA·g^(−1).In addition,the typical graphite potassium storage mechanism is also demonstrated by in situ X-ray diffraction(XRD)and in situ Raman spectroscopy,and its practicality is also proved by the voltage of the full *** work provides a feasible way to optimize the practical production process of AG and expand its application in energy storage.

关键词： graphite anode potassium-ion batteries high graphitization degree low-temperature pyrolysis initial Coulombic efficiency

静电纺丝制备的聚己内酯/还原氧化石墨烯神经导管基底膜的生物相容性研究

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组织工程与重建外科 2024年第4期20卷 416-421页

作者：叶开黄晓夏仵博宇王江华乌日开西·艾依提何乐乐滕勇新疆医科大学研究生院新疆维吾尔自治区乌鲁木齐市830000 中国人民解放军新疆军区总医院脊柱外科新疆维吾尔自治区乌鲁木齐市830000 新疆大学机械工程学院新疆维吾尔自治区乌鲁木齐市830000

目的探索5种不同含量的聚己内酯/还原氧化石墨烯(Polycaprolactone/reduced graphene oxide,PCL/RGO)神经导管基底膜材料与PC12细胞的体外生物相容性。方法应用静电纺丝技术制备5种不同RGO含量的PCL/RGO神经导管基底膜样材料,并与PC12... 详细信息

目的探索5种不同含量的聚己内酯/还原氧化石墨烯(Polycaprolactone/reduced graphene oxide,PCL/RGO)神经导管基底膜材料与PC12细胞的体外生物相容性。方法应用静电纺丝技术制备5种不同RGO含量的PCL/RGO神经导管基底膜样材料,并与PC12细胞共培养。使用CCK-8法测定PC12细胞的增殖情况,扫描电镜观察细胞的黏附与生长情况,活死细胞染色观察细胞活性。结果5组材料所对应的细胞增殖率有差异,但毒性分级均为0级(无细胞毒性),其中0.75%RGO/PCL组的细胞增殖情况最佳。5组材料培养7 d后,电镜观察显示细胞黏附生长明显较1 d、3 d增多,并铺满了材料表面。活死细胞染色结果显示,各组细胞存活率均在90%以上。结论5种不同RGO含量的PCL/RGO复合材料均具有良好的生物相容性,尤以0.75%RGO/PCL在促进细胞增殖、黏附方面有比较大的优势。

关键词：静电纺丝聚己内酯还原氧化石墨烯 PC12细胞生物相容性