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基于连续双脉冲测试的GaN HEMT动态导通电阻变化及测量方法

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半导体技术 2024年第10期49卷 920-925页

作者：陈耀峰国家电投集团河北电力有限公司石家庄050000

实际应用中,GaN HEMT的动态导通电阻会随着工作电压、工作温度等因素的变化而改变,相同温度下的实际值常与静态测量结果有所差异。由于实验条件及测量方法不同,同一型号的器件往往会出现不一致的测试结果,对应用工况的设计与监测带来了... 详细信息

实际应用中,GaN HEMT的动态导通电阻会随着工作电压、工作温度等因素的变化而改变,相同温度下的实际值常与静态测量结果有所差异。由于实验条件及测量方法不同,同一型号的器件往往会出现不一致的测试结果,对应用工况的设计与监测带来了困难。针对这一问题,提出了基于连续双脉冲的测试方法,并提出了一种基于差分计算的动态导通电阻提取方法,以更准确地提取器件的动态导通电阻。进一步讨论了母线电压和温度对器件动态导通电阻的影响,当母线电压增大时,GaN HEMT的动态导通电阻表现出先增大后减小的非单调的变化特性,动态导通电阻的标准值基本不随温度变化而改变。最后,探究了GaN HEMT动态导通电阻变化的机理,进一步加深了对器件动态导通电阻变化的理解。

关键词： GaN HEMT 动态导通电阻连续双脉冲测试差分计算机理分析

Zinc Powder Catalysed Formylation and Urealation of Amines Using CO2 as a C1 Building Block

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Chinese Journal of Chemistry 2020年第10期38卷 1057-1064页

作者： Chongyang Du yaofeng chen State Key Laboratory of Organometllic Chemistry Shanghai Institute of Organic ChemistryUniversity of chinese Academy of SciencesChinese Academy of Sciences345 Lingling RoadShanghai 200032China

Summary of main observation and conclusion Transformation of CO2 into valuable organic compounds catalysed by cheap and biocompatible metal I catalysts is one of important topics of current organic synthesis and ***,we report the zinc powder catalysed formylation and urealation of amines with CO2 and(EtO)zSiH under solvent free *** 2 mol%zinc powder as the catalyst,a series of secondary amines,both the aromatic ones and the aliphatic ones,can be formylated into *** primary aromatic amines were used as the substrates,the reactions produce urea *** electronic and steric effects from the substrates on the formylation and urealation reactions were observed and *** recovery and reusability of zinc powder were investigated,showing the zinc powder can be reused in the formylation reaction without loss of catalytic *** analysis on the reactants/products mixture after filtering out the zinc powder showed the zinc concentration in the mixture is low to 1 *** path-ways for the formylation and urealation of amines with this catalytic system were also investigated,and related to the different substrates.

关键词： amines aromatic mixture

鸡前脂肪细胞温度应激相关基因和信号通路的鉴定分析

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中国家禽 2024年第10期46卷 1-10页

作者：熊燕霞陈耀峰张镕杜志强长江大学动物科学技术学院湖北荆州434020

为探究温度应激如何影响鸡前脂肪细胞的转录组变化,鉴定分析关键基因和信号通路,以鸡永生化前脂肪细胞系ICP1为研究对象,收集分析20℃、37℃和43℃应激处理18 h的细胞转录组数据,并通过实时荧光定量PCR验证3个与脂质代谢相关的差异表达... 详细信息

为探究温度应激如何影响鸡前脂肪细胞的转录组变化,鉴定分析关键基因和信号通路,以鸡永生化前脂肪细胞系ICP1为研究对象,收集分析20℃、37℃和43℃应激处理18 h的细胞转录组数据,并通过实时荧光定量PCR验证3个与脂质代谢相关的差异表达基因。结果显示:(1)与对照组37℃相比,20℃和43℃处理,LncPrdm16两个转录本的表达水平显著上调(P<0.05);而随温度升高,PRDM16两个转录本表达水平显著下调(P<0.05)。此外,20℃处理抑制前脂肪细胞增殖并促进细胞死亡,而43℃处理促进细胞增殖;(2)鉴定组间的显著差异表达基因(DEGs)(P<0.05):1 193个(20℃vs 37℃)、6 271个(20℃vs 43℃)和6 204个(37℃vs43℃)。基因富集分析(GO和KEGG)发现,DEGs主要参与脂质代谢、甘油磷脂代谢和PPAR信号通路(20℃vs 37℃),脱氧核糖核酸代谢、细胞周期过程、细胞大分子生物合成、磷脂酰肌醇信号、过氧化物酶体和脂肪酸降解等过程(20℃vs 43℃),以及磷脂代谢、神经系统、氨基酸代谢、脂肪酸代谢和神经活性配体-受体相互作用等通路(37℃vs 43℃);(3)定量PCR验证了20℃和43℃处理分别显著诱导FABP4和APOA1表达(P<0.05),以及显著抑制FABP4(P<0.01)和PPARα(P<0.05)的表达。综上所述,温度应激会诱导鸡前脂肪细胞中脂肪合成基因的差异表达,为深入研究其分子调控机制和应用于生产实践奠定基础。

关键词：鸡前脂肪细胞温度应激转录组脂肪合成

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Divalent Ytterbium Iodide Supported by β-Diketiminato Based Tridentate Ligand: Synthesis, Structure and Small Molecule Activation

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Chinese Journal of Chemistry 2020年第3期38卷 247-253页

作者： Xiaojuan Liu Li Xiang chen Wang Bingwu Wang Xuebing Leng yaofeng chen State Key Laboratory of Organometllic Chemistry Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences345 Lingling RoadShanghai 200032China Beiing National laboratory of Molecular Science State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsCollege of Chemistry and Moleculor EngineeringPeking UniversityBeijing 100871Chino

Divalent ytterbium lodide[LYb(μ-I)(THF)]2(1;L=[MeC(NDIPP)CHC(Me)NCH2CH2NMe2]^-,DIPP=2,6-(iPr)2C6H3)was synthesized and its reactivity was *** 1 was synthesized by salt metathesis of Ybl2(THF)2 with the potassium salt of ligand(KL)in high *** the reactions with trimethylsil azide,azobenzene,sulfur and diphenyl disufide,complex 1 acts as a 2e *** the reaction with CO2,the central carbon atom ofβ-diketiminato backbone in 1 nuclephilcally attacks the CO2 molecule to give a divalent ytterbium carboxylate.

关键词： backbone potassium azide

TaSCL14,a Novel Wheat(Triticum aestivum L.)GRAS Gene,Regulates Plant Growth,Photosynthesis,Tolerance to Photooxidative Stress,and Senescence

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Journal of Genetics and Genomics 2015年第1期42卷 21-32页

作者： Kunmei chen Hongwei Li yaofeng chen Qi Zheng Bin Li Zhensheng Li College of Agronomy Northwest A&F University State Key Laboratory of Plant Cell and Chromosome Engineering Institute of Genetics and Developmental BiologyChinese Academy of Sciences

Rates of photosynthesis, tolerance to photooxidative stress, and senescence are all important physiological factors that affect plant development and thus agricultural productivity. GRAS proteins play essential roles in plant growth and development as well as in plant responses to biotic and abiotic stresses. So far few GRAS genes in wheat （Triticum aestivum L.） have been characterized. A previous transcriptome analysis indicated that the expression of a GRAS gene （TaSCL14） was induced by high-light stress in Xiaoyan 54 （XY54）, a common wheat cultivar with strong tolerance to high-light stress. In this study, TaSCL14 gene was isolated from XY54 and mapped on chromosome 4A. TaSCL14 was expressed in various wheat organs, with high levels in stems and roots. Our results confirmed that TaSCL14 expression was indeed responsive to high-light stress. Barley stripe mosaic virus （BSMV）-based virus-induced gene silencing （VIGS） of TaSCL14 in wheat was performed to help characterize its potential functions. Silencing of TaSCL14 resulted in inhibited plant growth, decreased photosynthetic capacity, and reduced tolerance to photooxidative stress. In addition, silencing of TaSCL14 in wheat promoted leaf senescence induced by darkness. These results suggest that TaSCL14 may act as a multifunctional regulator involved in plant growth, photosynthesis, tolerance to photooxidative stress, and senescence.

关键词： Triticum aestivum L. TaSCL14 Photosynthesis Photooxidative resistance Senescence BSMV--VIGS

Scandium terminal imido complex induced intramolecular C-N bond cleavage and transformation

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Science China Chemistry 2014年第8期57卷 1098-1105页

作者： CHU JiaXiang ZHOU QingHai LI YuXue LENG XueBing chen yaofeng State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences

The scandium terminal imido complex supported by a monoanionic tetradentate NNNN ligand, [LSc=N(DIPP)](L = [MeC(N(DIPP))CHC(Me)(NCH2CH2N(Me)CH2CH2NMe2]-, DIPP = 2,6-(iPr)2C6H3)(1), undergoes a C–N bond cleavage at elevated temperature to give a mononuclear scandium anilido intermediate 2a, which subsequently aggregates into a binuclear scandium anilido complex 2. The mononuclear intermediate 2a reacts with alkyne or imine to provide two scandium anilido complexes 3 and 4, which contain a dianionic tetradentate NNNC ligand or a dianionic tetradentate NNNN ligand. DFT calculations on the reaction mechanism of C–N bond cleavage in 1 were also performed.

关键词： C-N bond cleavage DFT calculation imido complex scandium

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Are Sc-C and Sc-P Bonds Reactive in Scandium Phosphinoalkylidene Complex？ Insights on a Versatile Reactivity

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Chinese Journal of Chemistry 2018年第10期36卷 904-908页

作者： Weiqing Mao Li Xiang Carlos Alvarez Lamsfus Laurent Maron Xuebing Leng yaofeng chen State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry Univer- sity of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China LPCNO CNRS & INSA Universite Paul Sabatier 135 Avenue de Rangueil 31077 Toulouse France

The peculiar electronic structure of scandium phosphinoalkylidene complex [LSc{C（SiMe3）PPh2}THF] （L=[MeC（NDIPP）CHC（NDIPP）Me]-）, DIPP= 2,6-（Pr）2C6H3） leads to an interesting versatile reactivity, which is demonstrated both experimentally and computationally. The complex undergoes [2＋2] cycloaddition reactions with alkynes, and easily activates various X-O bonds such as C-O of propylene oxide, N-O of 3,5-dimethylisoxazole, B-O of pinacolborane and Si-O of triethoxysilane. These reactions occur on the Sc-C bond of the phosphinoalkylidene complex. Interestingly, the Sc-P bond can also be activated as the presence of a Sc-C-P three center π interaction in the complex allows performing C-F activation of 2,6-difluoro- pyridine and 1,2 addition with imine or ketone. The complex also reacts with metal complexes, [（COD）RhCl]2 and （Ph3P）AuCl, to form structural intriguing heterobimetallic complexes.

关键词： alkylidene density functional calculations multiple bonds phosphorus scandium

Boron-Oxygen Bond Cleavage of Pinacolborane and Catecholborane Mediated by a Scandium Phosphinidene Complex

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Chinese Journal of Chemistry 2014年第8期32卷 752-756页

作者： Wei Wang Yingdong Lv Xiaofeng Gou Xuebing Leng yaofeng chen Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education College of Chemistry and Materials ScienceNorthwest UniversityXi'anShaanxi 710069China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

Reactions of bis-scandium bridged phosphinidene complex,[LSc(μ-PAr)]_(2)(L=MeC(NDIPP)CHC(Me)(NCH_(2)CH_(2)N(^(i)Pr)_(2)),DIPP=2,6-(^(i)Pr)_(2)C_(6)H_(3);Ar=2,6-Me_(2)C_(6)H_(3))(1),with pinacolborane,catecholborane,and 9-borabicyclo[3.3.1]nonane(9-BBN)are *** 1 reacts with pinacolborane and catecholborane to give scandium pinacolate(2)and catecholate(3),showing B-O bond *** two scandium complexes contain an unusual[P(Ar)B(H)P(Ar)]^(2−)dianion,which displays aμ-η^(2):η^(2) coordination *** the other hand,reaction of complex 1 with 9-BBN affords the B-H bond cleavage product,1,3-diphospha-2,4-diboracyclobutane(4).

关键词： catecholborane phosphinidene pinacolborane scandium reactivity

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超临界水处理放射性废树脂系统屏蔽计算分析

同位素 2024年第4期37卷 327-331页

作者：陈耀峰张天一韩佳琪中核第七研究设计院有限公司太原030000

核燃料循环利用、反应堆冷却水处理、乏燃料水池净化等核设施运行过程中会产生放射性废树脂。处理放射性废树脂必须考虑系统辐射防护,采用有效的屏蔽措施保护公众及环境安全。根据屏蔽材料的种类和位置,设计三种不同的屏蔽组合方式,计... 详细信息

核燃料循环利用、反应堆冷却水处理、乏燃料水池净化等核设施运行过程中会产生放射性废树脂。处理放射性废树脂必须考虑系统辐射防护,采用有效的屏蔽措施保护公众及环境安全。根据屏蔽材料的种类和位置,设计三种不同的屏蔽组合方式,计算分析每种方式的屏蔽效果及适用场景,为工程应用提供相关参考。同时,利用SuperMC辐射屏蔽计算软件,以超临界水氧化处理设施为研究对象,计算分析反应容器、树脂研磨装置、废树脂中转罐、增压泵等废树脂流经设备表面剂量率。计算结果表明,无屏蔽时相关设备表面剂量率为22.13~48.64μSv/h,利用铅屏蔽层对表面剂量率较高的设备进行屏蔽防护,屏蔽后满足控制区5μSv/h以下剂量率限值要求。

关键词：放射性废树脂处理设施表面剂量率屏蔽计算

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