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石墨化温度及产品位置对产品性能影响的研究

炭素技术 2024年第4期43卷 75-78页

作者：李启常张宇熊杰宋伟杰湖南长宇科技发展有限公司湖南省高性能炭石墨材料工程技术研究中心湖南长沙410600

将湖南长宇科技发展有限公司的2浸3焙产品切割成相同尺寸的若干样品,通过位置进行选取样品,然后研究不同的石墨化温度以及产品的位置对产品综合性能的影响。结果表明,随着石墨化温度的提高,产品的体积密度、收缩率、电学性能均有所提升... 详细信息

将湖南长宇科技发展有限公司的2浸3焙产品切割成相同尺寸的若干样品,通过位置进行选取样品,然后研究不同的石墨化温度以及产品的位置对产品综合性能的影响。结果表明,随着石墨化温度的提高,产品的体积密度、收缩率、电学性能均有所提升,力学性能有所降低,并且产品的边缘位置由于浸渍沥青的含量较多,不同石墨化温度处理的样品各项性能均优于中心位置,但是产品不同位置的石墨化度几乎一致。

关键词：石墨化温度位置电学性能力学性能

肠道菌群影响mTOR信号通路延缓衰老的研究进展

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生理科学进展 2024年第4期55卷 312-319页

作者：宋雅欣谢浩邵梅李其昌郭君慧武汉理工大学化学化工与生命科学学院武汉430000

肠道菌群(gut microbiota)与人类健康密切相关。肠道菌群紊乱会干扰调控细胞生长和营养代谢的哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路,导致年龄相关性疾病如糖尿病、脂肪肝、肾病、神经系统性疾病等的发生... 详细信息

肠道菌群(gut microbiota)与人类健康密切相关。肠道菌群紊乱会干扰调控细胞生长和营养代谢的哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路,导致年龄相关性疾病如糖尿病、脂肪肝、肾病、神经系统性疾病等的发生,从而影响机体衰老进程。本文对肠道菌群干扰mTOR信号通路及其对机体稳态的影响和导致的衰老相关疾病进行了分析和总结,重点介绍了肠道菌群及代谢产物如何通过mTOR信号通路调节细胞代谢、炎症、自噬等进程,为衰老相关疾病防治、干预和延缓衰老进程提供指导。

关键词：肠道菌群 mTOR信号通路衰老炎症自噬

阀门开度对余压发电水轮机水力性能的影响研究

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节能 2024年第3期43卷 30-33页

作者：梁武科丁科李其昌董剑西安理工大学水利水电学院陕西西安710048 国家电投集团重庆狮子滩发电有限公司四川重庆401220

为了研究阀门开度对余压发电水轮机水力性能的影响规律,以肖家河污水处理厂的余压发电水轮机为研究对象,选取3种不同开度的阀门进行对比,采用Ansys CFX软件的standard k-ε湍流模型进行全流道数值模拟,得到阀门开度与余压发电水轮机水... 详细信息

为了研究阀门开度对余压发电水轮机水力性能的影响规律,以肖家河污水处理厂的余压发电水轮机为研究对象,选取3种不同开度的阀门进行对比,采用Ansys CFX软件的standard k-ε湍流模型进行全流道数值模拟,得到阀门开度与余压发电水轮机水力性能之间的关系。结果表明:阀门开度对余压发电水轮机外特性的影响呈非线性关系。阀门开度小于50°时,开度的变化会明显影响水头,但随着开度增加,其影响逐渐降低;流量的增加会导致不同开度下外特性之间的差距扩大。高湍动能区域主要分布在泄水锥与阀门附近,随着流量的增加,余压发电水轮机内阀门附近的高湍动能区域增加,而泄水锥附近的高湍动能区域减少。在相同工况条件下,阀门开度越大,流道内的高湍动能区域越少,而流量增大会增加由阀门开度引起的湍动能特性之间的差异。

关键词：阀门开度余压发电水轮机水力性能数值分析

Advances in the study of auxin early response genes:Aux/IAA,GH3,and SAUR

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The Crop Journal 2024年第4期12卷 964-978页

作者： Dongfang Bao Senqiu chang Xiaodong li Yanhua qi Key Laboratory of Herbage&Endemic Crop Biology of Ministry of Education Inner Mongolia Key Laboratory of Herbage&Endemic Crop BiotechnologySchool of Life SciencesInner Mongolia UniversityHohhot 010000Inner MongoliaChina

Auxin plays a crucial role in all aspects of plant growth and *** can induce the rapid and efficient expression of some genes,which are named auxin early response genes(AERGs),mainly including the three families:auxin/indole-3-acetic acid(Aux/IAA),Gretchen Hagen 3(GH3),and small auxin-up RNA(SAUR).Aux/IAA encodes the Aux/IAA protein,which is a negative regulator of auxin ***/IAA and auxin response factor(ARF)form a heterodimer and participate in a variety of physiological processes through classical or non-classical auxin signaling *** GH3 encodes auxin amide synthetase,which catalyzes the binding of auxin to acyl-containing small molecule substrates(such as amino acids and jasmonic acid),and regulates plant growth and stresses by regulating auxin *** is a class of small auxin up-regulated *** response to auxin is complex,and the process may occur at the transcriptional,post-transcriptional and protein *** the development of multi-omics,significant progress has been made in the study of Aux/IAA,GH3,and SAUR genes,but there are still many *** review offers insight into the characteristics of Aux/IAA,GH3,and SAUR gene families,and their roles in roots,hypocotyls,leaves,leaf inclinations,flowers,seed development,stress response,and phytohormone crosstalk,and provides clues for future research on phytohormone signaling and the molecular design breeding of crops.

关键词： Auxin Aux/IAA GH3 SAUR Stress

The Characterization of Comblike Polymer Electrolyte by Means of NMR

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Chinese Chemical Letters 2000年第1期11卷 75-78页

作者： Zi Jiang JIANG li qi( chang Chun Institute of Applied Chemistry, Chinese Academy of Sciences, National Analytical Research Center of Electrochemistry and Spectroscopy, chang Chun 130022) chang Chun Inst. of Appl. Chemistry Chinese Academy of Sciences Natl. Analyt. Res. Ctr. E. Chang Chun 130022 China

The comblike polymers based on poly (styrene-co-maleic anhydride) backbone with poly (ethylene glycol) methyl ether as side chains were synthesized and characterized by H-1 NMR. with the result compared with that of 1... 详细信息

关键词： H-1-NMR poly (styrene-co-maleic anhydride) IR polymer solid electrolyte

Realizing the excellent oxidation resistance of an environmental barrier coating through aluminum surface modification

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Journal of Advanced Ceramics 2024年第7期13卷 976-986页

作者： lin Dong Wen-qi Yang lin Chen Guan-Jun Yang chang-Jiu li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Engine Company limited in China Aerospace Science and Technology Corporation Xi’an 710065China

The lifetime of Si-based environmental barrier coatings(EBCs)is constrained by thermally grown SiO_(2)oxidelayer(SiO_(2)-TGO),which can cause premature cracking and *** address this issue,a new approach for surfacemodification using aluminum is *** oxidation performance was examined in a 50 vol%H_(2)O-50 vol%O_(2)environment at 1350℃for up to 300 *** results indicate that a dense ytterbium aluminum garnet(YbAG)layer wasformed after modification,decreasing the porosity by 80%.Due to the elimination of fast diffusion channels and the lowoxygen permeability of YbAG,aluminum modification significantly reduced the growth rate of SiO_(2)-TGO by nearly twoorders of ***,its thickness decreased by more than 70%after 300 h of exposure.A diffusioncontrolled oxidation mechanism indicates that the modified dense surface is equivalent to an initial SiO_(2)layer with a specificthickness,causing a shift in the oxidation time and increasing the oxidation *** research provides valuableinsights for designing Si-based EBC with improved lifetimes.

关键词： environmental barrier coating(EBC) oxidation modification diffusion cracking

Host-induced silencing of MpPar6 confers Myzus persicae resistance in transgenic rape plants

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Journal of Integrative Agriculture 2024年第1期23卷 187-194页

作者： qi Zhang Wenqin Zhan Chao li ling chang Yi Dong Jiang Zhang State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life SciencesHubei UniversityWuhan 430062China Oil Crops Research Institute Chinese Academy of Agricultural SciencesWuhan 430062China Agricultural Genomics Institute at Shenzhen Chinese Academy of Agricultural SciencesShenzhen 518000China

Plant-mediated RNA interference(RNAi)has emerged as a promising technology for insect *** green peach aphid,Myzus persicae,feeds on over 400 species of host *** napus(rape)is the second most important oilseed crop *** persicae is highly reproductive and causes severe damage to the rape plants due to its quite flexible life *** this study,we tested the RNAi effects of transgenic rape plants on *** in vitro feeding *** with artificial diets containing double-stranded RNAs(dsRNAs)targeting seven aphid genes,we identified a new gene encoding the partitioning-defective protein 6(Par6)as the most potent RNAi ***-and stage-expression analysis of Par6 suggested this gene is highly expressed in the embryo and adult stage of *** next generated transgenic rape plants expressing ds Par6 by Agrobacteriummediated transformation and obtained nine independent transgenic *** to wild-type control plants,transgenic rape lines expressing ds Par6 showed strong resistance to *** assays revealed that feeding transgenic rape plants to *** significantly decreased MpPar6 expression and survival rate and impaired ***,we showed that the resistance levels to *** are positively correlated with ds Par6 expression levels in transgenic rape *** study demonstrates that transgenic rape plants expressing ds Par6 are efficiently protected from *** with the genes involved in embryo development could be the effective RNAi targets for controlling aphids and potentially other insect pests.

关键词： oilseed rape pest control aphid double-stranded RNA RNA interference

Greedy Lattice Paths with General Weights

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2213-2222页

作者： Yin Shan chang An qi ZHENG College of Mathematics Sichuan UniversityChengdu 610065P.R.China

Let{X_(v):v∈Z^(d)}be *** *** S(π)=Σ_(v∈π)X_(v)be the weight of a self-avoiding lattice pathπ.Let M_(n)=max{S(π):πhas length n and starts from the origin}.We are interested in the asymptotics of Mn as n→∞.This model is closely related to the first passage percolation when the weights{X_(v):v∈Z^(d)}are non-positive and it is closely related to the last passage percolation when the weights{X_(v):v∈Z^(d)}are *** general weights,this model could be viewed as an interpolation between first passage models and last passage ***,this model is also closely related to a variant of the position of right-most particles of branching random *** the two assumptions that∃α>0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)<+∞and that E[(X_(0)^(−))^(4)]<+∞,we prove that M_(n)/n converges to the same constant M almost surely as n tends to infinity.

关键词： Last passage percolation first passage percolation greedy lattice path

Durable dual-state duplex Si-HfO_(2)with excellent oxidation and cracking resistance

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Journal of Advanced Ceramics 2024年第3期13卷 388-401页

作者： lin Chen Jing-Chuan Luo Wen-qi Yang chang-Jiu li Guan-Jun Yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Xi’an Aerospace Engine Company limited in CASC Xi’an 710065China

The lifetime of Si bond coatings in environmental barrier coatings is constrained by phase-transition-induced cracking of the SiO_(2)*** this study,Si-HfO_(2)dual-state duplex composite materials are proposed to address this issue by partially forming HfSiO_(4)and minimizing the SiO_(2)*** as-prepared composite exhibited a structure comprising discrete HfO_(2)“bricks”embedded in a continuous Si“mortar”,while the oxidized state transformed into discrete HfSiO_(4)“bricks”within continuous thin SiO_(2)“mortars”.The results indicate that continuous thin SiO_(2)contributes to reducing the oxidation rate to a level comparable to that of pure Si,and discrete HfSiO_(4)particles aid in relieving phase transition-induced stress and inhibiting crack propagation,thereby enhancing oxidation and cracking resistance ***,the composite with 20 mol%HfO_(2)and a mean particle size of~500 nm at 1370℃exhibited a service lifetime 10 times greater than that of pure *** research provides valuable insights for designing Si-based bond coatings with improved service lifetime.

关键词： oxidation environmental barrier coatings(EBCs) phase transition cracking bond coatings