检索结果-南通市图书馆

Nanostructured AlFeO_(3) thin films as a novel photoanode for photoelectrochemical water splitting

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 1075-1085页

作者： Xin Sun Min Wang qi geng Shuailin Chen Xiaojun Lv Xunlei Ding Meicheng li State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of New EnergyNorth China Electric Power UniversityBeijing 102206China School of Mathematics and Physics North China Electric Power UniversityBeijing 102206China

The earth-abundant and robust aluminum ferrite,AlFeO_(3)(AFO),is mainly studied in the context of ***,we demonstrate that AFO can be used as a stable solar absorber in photoelectrochemical cells for solar water splitting,exhibiting attractive *** is the first report on the photoelectrochemical activity of *** thin-film photoelectrodes prepared by solution-processing methods are composed of vertically oriented thin nanosheets,featuring the rhombohedral symmetry(R3c)and n-type *** as-prepared AFO photoanodes generate a photocurrent density of+0.78 mA·cm^(-2) at 1.23 V *** hydrogen electrode(RHE)with the photocurrent _(onset) potential(U_(onset))close to the flat band potential of 0.5 V *** in the presence of hole ***,the U_(onset) of AFO for solar water splitting coincides with the flat band potential as well,which is rare in n-type inorganic *** also report other properties of AFO associated with photoelectrochemical *** films exhibit a band gap energy of 2.31 eV and positive band edges with low ***,the carrier lifetimes in AFO films are up to millisecond timescales under the mediation of defect *** on the photoelectrochemical behavior and optoelectronic properties,we believe that AFO has great potential for application in photoelectrochemical cells.

关键词： AlFeO_(3) photoanode nanosheets photoelectrochemistry onset potential

ESTIMATING EXTREME-VALUE INDEX FROM RECORDS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1998年第4期19卷 499-510页

作者： qi YONGCHENG (department of Probability & Statistics, peking university, beijing 100871, china.) peking Univ Dept Stat & Probabil Beijing 100871 Peoples R China

This paper constructs from the record values an estimator of the extreme-value index. It is proved that the estimator is consistent in the domain of attraction of extremesvalue distributions, and that under very mild ... 详细信息

关键词： Record Extreme value distribution Estimator Consistency Asymptotic normality

SYNTHESIS AND PROPERTIES OF NEW MESOGEN-JACKETED liQUID CRYSTALliNE POLYMERS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2000年第2期18卷 139-148页

作者： qi-ding Mi qi-feng Zhou department of Polymer Science & Engineering, College of Chemistry peking university, beijing 100871, china peking Univ Coll Chem Dept Polymer Sci & Engn Beijing 100871 Peoples R China

Some new mesogen-jacketed liquid crystalline polymers (MJLCP) with polymer backbones, spacers, and mesogenic units of different structures were synthesized by radical polymerization. The mesomorphic behavior of these polymers was examined using differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Their liquid crystallinity is influenced by the variation of polymer backbone, spacer, mesogenic unit and its terminal groups. The results show that 1) a more flexible polymer main-chain is more favorable to the formation of a liquid crystal phase, while 2) a flexible spacer will decrease the 'Jacket Effect' and the liquid crystallinity and 3) a subtle modification of the terminal groups on the mesogenic unit may also have a significant influence on properties of the polymers.

关键词： mesogen-jacketed liquid crystalline polymers polymer backbones spacers mesogenic units liquid crystallinity

Microfluidic-oriented synthesis of enriched iridium nanodots/carbon architecture for robust electrocatalytic nitrogen fixation

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2024年第3期9卷 544-555页

作者： Hengyuan liu Xingjiang Wu Yuhao geng Xin li Jianhong Xu The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China

Electrocatalytic nitrogen reduction reaction(NRR)is considered as a promising candidate to achieve ammonia synthesis because of clean electric energy,moderate reaction condition,safe operating process and harmless ***,the chemical inertness of nitrogen and poor activated capacity on catalyst surface usually produce low ammonia yield and faradic ***,the microfluidic technology is proposed to efficiently fabricate enriched iridium nanodots/carbon *** to in-situ co-precipitation reaction and microfluidic manipulation,the iridium nanodots/carbon nanomaterials possess small average size,uniform dispersion,high conductivity and abundant active sites,producing good proton activation and rapid electrons transmission and moderate adsorption/desorption *** a result,the as-prepared iridium nanodots/carbon nanomaterials realize large ammonia yield of 28.73 μg h^(-1) cm^(-2) and faradic efficiency of 9.14%in KOH ***,the high ammonia yield of 11.21 μg h^(-1) cm^(-2) and faradic efficiency of 24.30%are also achieved in H_(2)SO_(4) *** microfluidic method provides a reference for large-scale fabrication of nano-sized catalyst materials,which may accelerate the progress of electrocatalytic NRR in industrialization field.

关键词： Iridium nanodots Carbon Microfluidic technology Efficient synthesis Electrocatalytic nitrogen fixation

IRE1α regulates the PTHrP-IHH feedback loop to orchestrate chondrocyte hypertrophy and cartilage mineralization

在线全文

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第1期11卷 464-478页

作者： Mengtian Fan Nana geng Xingyue li Danyang Yin Yuyou Yang Rong Jiang Cheng Chen Naibo Feng li liang Xiaoli li Fengtao Luo Huabing qi qiaoyan Tan Yangli Xie Fengjin Guo Laboratory of Developmental Biology Department of Cell Biology and GeneticsSchool of Basic Medical ScienceChongqing Medical UniversityChongqing 400016China Laboratory of Stem Cells and Tissue Engineering School of Basic Medical ScienceChongqing Medical UniversityChongqing 400016China department of Orthopedics The 1st Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China department of Wound Repair and Rehabilitation Medicine State Key Laboratory of TraumaBurns and Combined InjuryTrauma CenterResearch Institute of SurgeryDaping HospitalArmy Medical UniversityChongqing 400042China

Cartilage development is controlled by the highly synergistic proliferation and differentiation of growth plate chondrocytes,in which the Indian hedgehog(IHH)and parathyroid hormone-related protein-parathyroid hormone-1 receptor(PTHrP-PTH1R)feedback loop is *** inositol-requiring enzyme 1a/X-box-binding protein-1 spliced(IRE1α/XBP1s)branch of the unfolded protein response(UPR)is essential for normal cartilage ***,the precise role of ER stress effector IRE1α,encoded by endoplasmic reticulum to nucleus signaling 1(ERN1),in skeletal development remains ***,we reported that loss of IRE1α accelerates chondrocyte hypertrophy and promotes endochondral bone ***1 acts as a negative regulator of chondrocyte proliferation and differentiation in postnatal growth *** deficiency interrupted PTHrP/PTH1R and IHH homeostasis leading to impaired chondrocyte hypertrophy and ***1s,produced by p-IRE1α-mediated splicing,binds and up-regulates PTH1R and IHH,which coordinate cartilage ***,ER stress cannot be activated normally in ERN1-deficient *** conclusion,ERN1 deficiency accelerates chondrocyte hypertrophy and cartilage mineralization by impairing the homeostasis of the IHH and PTHrP/PTH1R feedback loop and ER ***1 may have a potential role as a new target for cartilage growth and maturation.

关键词： Cartilage development ER stress ERN1 IHH PTHrP/PTH1R

AtVQ25 promotes salicylic acid-related leaf senescence by fine-tuning the self-repression of AtWRKY53

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第6期66卷 1126-1147页

作者： qi Tan Mingming Zhao Jingwei Gao Ke li Mengwei Zhang Yunjia li Zeting liu Yujia Song Xiaoyue Lu Zhengge Zhu Rongcheng lin Pengcheng Yin Chunjiang Zhou geng Wang Ministry of Education Key Laboratory of Molecular and Cellular Biology Hebei Research Center of the Basic Discipline of Cell BiologyHebei Collaboration Innovation Center for Cell Signaling and Environmental AdaptationHebei Key Laboratory of Molecular and Cellular BiologyCollege of Life SciencesHebei Normal UniversityShijiazhuang 050024China College of Chemical Engineering Shijiazhuang UniversityShijiazhuang 050035China Institute of Botany Chinese Academy of SciencesBeijing 100093China

Most mechanistic details of chronologically ordered regulation of leaf senescence are *** networks centered on AtWRKY53 are crucial for orchestrating and integrating various senescence-related ***,AtWRKY53binds to its own promoter and represses transcription of AtWRKY53,but the biological significance and mechanism underlying this selfrepression remain *** this study,we identified the VQ motif-containing protein AtVQ25as a cooperator of *** expression level of AtVQ25 peaked at mature stage and was specifically repressed after the onset of leaf ***25-overexpressing plants and atvq25 mutants displayed precocious and delayed leaf senescence,***,we identified AtWRKY53 as an interacting partner of *** determined that interaction between AtVQ25 and AtWRKY53 prevented AtWRKY53from binding to W-box elements on the AtWRKY53promoter and thus counteracted the selfrepression of *** addition,our RNA-sequencing data revealed that the AtVQ25-AtWRKY53 module is related to the salicylic acid(SA)*** leaf senescence and SA-induced leaf senescence in AtVQ25-overexpressing lines were inhibited by an SA pathway mutant,atsid2,and Nah G transgenic plants;AtVQ25-overexpressing/atwrky53 plants were also insensitive to SA-induced leaf ***,we demonstrated that AtVQ25 directly attenuates the self-repression of AtWRKY53 during the onset of leaf senescence,which is substantially helpful for understanding the timing of leaf senescence onset modulated by AtWRKY53.

关键词： AtWRKY53 leaf senescence salicylic acid transcriptional regulation VQ motif-containing proteins

A Systematic Study on Scaling Law of Spiral Waves

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1999年第3期4卷 3-5页

作者： Shufeng BAI,Yan li and qi QUYANG(These auhors attribute equally to this article)(department of Physics,peking university,beijing 100871,china) department of Physics Peking University Beijing 100871 China

Pactedsformationfarfromthermodynamicsequilibriumareubiquitousintheworld,typicalofwhichisthespiralpattern,***-diffusionsystems,***,whOSetiporbitsaci... 详细信息

Pactedsformationfarfromthermodynamicsequilibriumareubiquitousintheworld,typicalofwhichisthespiralpattern,***-diffusionsystems,***,whOSetiporbitsaci...

关键词： spirals non-linear waves scaling law

CONVERGENCE RATE OFDISTRIBUTIONS OF TRIMMED SUMS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 1996年第3期17卷 349-364页

作者： qi YONGCHENG CHENG SHIHONG(department of Probability & Statistics, beijing university, beijing 100871, china) beijing UNIV DEPT PROBABIL & STATBEIJING 100871PEOPLES R CHINA

The authors first derive the normal expansion of the joint density function of two orderstatistics from the uniform distribution and then, using the approximation, establish a wayto estimate the normal convergence rate for trimmed sums. For applications, the convergencerates for the intermediately trimmed sums and heavily trimmed surns are found out.

关键词： Trimmed sum Order statistics Convergence rate Normal approximation

ON THE ONE-SIDED LOGARITHMIC LAW FOR ARRAYS

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1999年第2期12卷 123-132页

作者： qi Yongcheng(department of Probability and Statistics, peking university, beijing 100871, china) 北京大学概率统计系北京

This paper studies the one-sided logarithmic law for arrays of independent random variables and derives the necessary and sufficient condition for it in the case where the random variables are lid.

关键词： Logarithmic law array of random variables.