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Iridium single-atom catalyst for highly efficient NO electroreduction to NH_(3)

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Nano Research 2023年第7期16卷 8737-8742页

作者： Kai Chen guohui wang Yali Guo Dongwei Ma Ke Chu School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Key Laboratory for Special Functional Materials of Ministry of Education School of Materials Science and EngineeringHenan UniversityKaifeng 475004China

Atomically dispersed Ir confined in amorphous MoO_(3)(Ir1/a-MoO_(3))was designed as a high-efficiency catalyst for electrochemical reduction reaction of NO to NH_(3)(NORR).Atomic precise characterizations reveal that isolated Ir atoms are immobilized in Ovacancies of amorphous MoO_(3) to form Ir_(1)-O_(5) *** computations demonstrate that single-site Ir1-O5 can not only powerfully activate and hydrogenate NO with a near-zero energy barrier,but also exhibit a higher affinity to NO over H adatoms to suppress the competing hydrogen evolution and promote both NORR activity and ***,Ir_(1)/a-MoO_(3) shows the maximum NH_(3)yield rate of 438.8μmol·h^(-1)·cm^(-2) and NH_(3)-Faradaic efficiency of 93.2%,representing one of the most efficient NORR catalysts to date.

关键词： electrochemical reduction of NO to NH_(3) single-atom catalysts amorphous materials theoretical calculations

基因多态性对侵袭性真菌感染患者伏立康唑血药浓度影响的Meta分析

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中国药房 2025年第2期36卷 225-231页

作者：李雅暄李兴德王国徽毛盼盼马雪娇宋沧桑昆明市第一人民医院药学部昆明650224

目的评价基因多态性对侵袭性真菌感染患者伏立康唑(VRZ)血药谷浓度(c_(min))的影响。方法检索the Cochrane Library、Embase、PubMed、Web of Science、中国生物医学文献数据库、中国知网、维普网和万方数据,收集基因多态性与VRZ c_(m... 详细信息

目的评价基因多态性对侵袭性真菌感染患者伏立康唑(VRZ)血药谷浓度(c_(min))的影响。方法检索the Cochrane Library、Embase、PubMed、Web of Science、中国生物医学文献数据库、中国知网、维普网和万方数据,收集基因多态性与VRZ c_(min)相关的文献,检索时间为建库至2024年4月。筛选文献,提取资料,评价文献质量后,使用R 4.3.2软件进行Meta分析。结果共纳入21篇文献,共计2 454例患者。Meta分析结果显示,CYP2C19 IM型、PM型患者的VRZ c_(min)均显著高于EM型,而IM型显著低于PM型(P<0.01);CYP2C9 rs1057910 AA型患者的VRZ c_(min)显著高于AC/CC型,CYP3A5 rs776746 CC型患者的VRZ c_(min)显著高于TT型(P<0.01);POR rs10954732 GG型患者的VRZ c_(min)显著高于GA型和AA型,POR rs1057868 CT型患者的VRZ c_(min)显著低于TT型(P<0.01);ABCB1 rs1045642 CC型患者的VRZ c_(min)显著高于TT型(P<0.05);NR1I2 rs2472677 CT型患者的VRZ c_(min)显著高于TT型,NR1I2 rs7643645 AA型患者的VRZ c_(min)显著高于AG型(P<0.05);ABCC2 rs717620 CC型患者的VRZ c_(min)均显著低于CT型和TT型,且CT型显著低于TT型(P<0.01)。结论 CYP2C19、CYP2C9rs1057910、CYP3A5rs776746、PORrs10954732、ABCB1rs1045642、NR1I2 rs7643645突变等位基因均可导致VRZ血药浓度降低,ABCC2 rs717620突变等位基因则可导致VRZ血药浓度升高。

关键词：伏立康唑侵袭性真菌感染基因多态性血药浓度 Meta分析

Stud Pose Detection Based on Photometric Stereo and Lightweight YOLOv4

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Journal of Artificial Intelligence and Technology 2022年第1期2卷 32-37页

作者： Xuan Zhang guohui wang School of Opto-Electronic Engineering Xi’an Technological UniversityXi’an 710021China

There are hundreds of welded studs in a *** posture of a welded stud determines the quality of the body assembly,thus affecting the safety of *** is crucial to detect the posture of the welded *** the lack of accurate method in detecting the position of welded studs,this paper aims to detect the weld stud’s pose based on photometric stereo and neural ***,a machine vision-based stud dataset collection system is built to achieve the stud dataset labelling ***,photometric stereo algorithm is applied to estimate the stud normal map which as input is fed to neural ***,we improve a lightweight YOLOv4 neural network which is applied to achieve the detection of stud position,thus overcoming the shortcomings of traditional testing *** research and experimental results show that the stud pose detection system designed achieves rapid detection and high accuracy positioning of the *** research provides the foundation combining the photometric stereo and deep learning for object detection in industrial production.

关键词： Stud pose photometric stereo neural network machine vision

Effect of acid density of HZSM-5 on the oligomerization of ethylene in FCC dry gas

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Journal of Natural Gas Chemistry 2009年第2期18卷 156-160页

作者： Xue Ding Shan Geng Chunyi Li Chaohe Yang guohui wang State Key Laboratory of Heavy Oil Processing China University of Petroleum （East China） Qingdao 266555 Shandong China Daqing Refining ＆ Chemical Company CNPC Daqing 163411 Heilongjiang China

The oligomerization of ethylene in FCC dry gas over HZSM-5 catalyst with different Si/A12 ratios was studied. The effect of acid density of catalyst on the oligomerization of ethylene was discussed. By increasing the acid density of catalyst, ethylene conversion showed a linear increase, while the yields of olefins decreased when the acid density of catalyst exceeded 0.14mmolNH3/g owing to a promotion of hydrogen transfer reaction. Through comparing the average distance between acid sites on catalyst with kinetic diameters of olefins, it was found that the dimerization of ethylene was not restrained by the sparse distribution of acid sites, while the hydrogen transfer reaction of C3 and C4 olefins was limited. On these bases, a conclusion is proposed that the dimerization of ethylene proceeded via Eley-Rideal mechanism, while the hydrogen transfer reaction of C3 and C4 olefins followed the Langmuir-Hinshelwood mechanism.

关键词： ethylene oligomerization dry gas HZSM-5 mechanism

Levels of Metabolic Enzymes and Nitrogenous Compounds in the Swimming Crab Portunus trituberculatus Exposed to Elevated Ambient Ammonia-N

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Journal of Ocean University of China 2018年第4期17卷 957-966页

作者： PAN Luqing SI Lingjun LIU Shengnan LIU Maoqi wang guohui The Key Laboratory of Mariculture Ministry of Education Ocean University of China

This study investigated the effects of ammonia-N(control and 1 and 5 mg L^(-1)) on the changes of metabolic enzymes activities and nitrogenous compounds levels in the gills, hepatopancreas, muscles, and hemolymph of the swimming crab Portunus trituberculatus. Results showed that the levels of hemolymph ammonia increased significantly at 6 h and then decreased to control level at 12 h. The activities of key enzymes involved in biosynthesis pathways of glutamine(Gln) and urea, such as glutamate dehydrogenase(GDH), glutamine synthetase(GS), and arginase(ARG), increased remarkably in different tissues of P. trituberculatus. Gln level was the highest in muscles, while urea content was the largest in hepatopancreas. The m RNA expression level of xanthine dehydrogenase(XDH) was downregulated sharply in gills but upregulated in the hepatopancreas and muscles. A small amount of uric acid was detected in the hemolymph. This result suggests that Gln in muscles may be used as an intermediary nitrogen repository, while urea may be primarily synthesized in the hepatopancreas and then transferred to other tissues via the hemolymph. Uric acid could be synthesized by the anabolism of purine nucleotides, in additon to the inhibitory activities of gills. In addition, the levels of Gln, urea and uric acid exhibited dose-and time-dependent effects with ammonia content. Therefore, P. trituberculatus could possibly convert ammonia into Gln, urea, or uric acid to detoxify ammonia during high ambient ammonia-N stress.

关键词： ammonia Portunus trituberculatus glutamine urea uric acid

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永磁牵引电机流固耦合传热计算与分析

防爆电机 2025年第1期60卷 19-22页

作者：王国辉李广付林黎宝梁中车株洲电机有限公司湖南株洲412000

永磁牵引电机的冷却结构设计及温升的研究对列车安全、稳定运行有着重要的意义,现以一台城轨全封闭永磁牵引电机为例,采用整机模型研究电机流固耦合传热计算,计算了电机冷却介质的流动情况、电机整机温度场分布。根据仿真计算结果,优化... 详细信息

永磁牵引电机的冷却结构设计及温升的研究对列车安全、稳定运行有着重要的意义,现以一台城轨全封闭永磁牵引电机为例,采用整机模型研究电机流固耦合传热计算,计算了电机冷却介质的流动情况、电机整机温度场分布。根据仿真计算结果,优化改进冷却结构,通过仿真进行验证计算,最终通过试验与仿真结果进行对比。研究结果表明:采用流固耦合的传热计算,能够了解电机冷却介质复杂的流动情况,电机的温度场计算准确;优化冷却结构后的电机,电机温升更加合理。

关键词：永磁牵引电动机流固耦合温度场传热

FC-BGA产品阻焊油墨下侧蚀影响因子分析及改善

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印制电路信息 2025年第1期33卷 29-33页

作者：陆然王国辉熊佳魏炜广州广芯封装基板有限公司广东广州510700

研究采用化学镍钯金(ENEPIG)表面处理的倒装球栅阵列(FC-BGA)产品,在锡膏印刷植球(SOP)制程植球后,对其可控塌陷芯片连接(C4)区域连接盘外阻焊下侧蚀表现展开分析。通过制程分析,明确影响阻焊下渗锡的影响因子,包括阻焊显影后油墨下侧... 详细信息

研究采用化学镍钯金(ENEPIG)表面处理的倒装球栅阵列(FC-BGA)产品,在锡膏印刷植球(SOP)制程植球后,对其可控塌陷芯片连接(C4)区域连接盘外阻焊下侧蚀表现展开分析。通过制程分析,明确影响阻焊下渗锡的影响因子,包括阻焊显影后油墨下侧蚀的长度、化学镍钯金前处理线微蚀槽的药水体系、化学镍钯金前处理线微蚀槽药水的微蚀量、化学镍钯金线在线浸泡式微蚀槽微蚀药水的微蚀量。通过关键影响因子的实验设计(DOE),确定最优条件,改善阻焊下总体侧蚀长度,进而有效降低SOP制程后,连接盘因油墨下侧蚀长度大渗锡引发的短路风险。

关键词：微球植球渗锡阻焊油墨侧蚀

The inhibiting effect of 1.4 recombinant P chromosome of wheat-Agropyron cristatum addition line on the Ph gene

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Chinese Science Bulletin 2010年第2期55卷 153-157页

作者： YANG guohui YANG XinMing wang RuiHui GAO AiNong LI LiHui LIU WeiHua National Key Facility for Crop Gene Resources and Genetic bnprovement/lnstitute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081 China

P chromosomes may carry a genetic system that inhibits the Ph gene in wheat. Abnormal chromosome synapsis in wheat-Agropyron cristatum addition line II-21-2 (additional 1·4 recombinant P chromosome) was observed in this study. The results of cytogenetics and Ph1 gene amplification showed that the Ph1 gene was normal and the average number of quadrivalents or hexavalents was determined to be 0.41 and 0.13, respectively, in pollen-mother cells of wheat-Agropyron cristatum addition line II-21-2. The analysis of dual-color GISH/FISH showed that the P chromosomes were not directly involved in the composition of multivalents but could inhibit the effect of the Ph gene, leading to synapsis of wheat homoeologous chromosomes and translocation between wheat homoeologous chromosomes such as 3B-3D chromosomes. The characteristic of P chromosomes’ promoting synapsis of wheat homoeologous chromosomes may have potential application in the genetic improvement of wheat.

关键词：染色体重组 Ph基因附加系小麦抑制作用冰草同源染色体电话

A survey of fault diagnosis technology for electronic circuit based on knowledge technology

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A survey of fault diagnosis technology for electronic circui...