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Cerium oxide inclusion nucleation mechanism based on classical nucleation theory and two-step nucleation

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Journal of Rare Earths 2024年第4期42卷 793-802页

作者： Yutang Li Jun wang Linzhu wang Chaoyi chen Shufeng Yang Junqi Li Xiang Li School of Materials and Metallurgy Guizhou UniversityGuiyang550025China State Key Laboratory of Public Big Data Guizhou UniversityGuiyang550025China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China department of Materials&Metallurgy Engineering Guizhou Institute of TechnologyGuiyang550003China

It is challenging to assess the mechanism responsible for the nucleation of inclusions in metals at high *** present work therefore systematically investigates the nucleation of cerium oxide inclusions according to classical nucleation theory and a two-step nucleation *** nucleation rates and nucleation radii of these inclusions are obtained,and the results demonstrate a considerable difference between theoretical and experimental *** the basis of a two-step nucleation mechanism,(CeO_(2))_(n) and(Ce_(2)O_(3))_(n)(n=1.6)clusters were constructed and the thermodynamic properties of both these clusters and of cerium oxide nanoparticles were *** addition,the entropies and heat capacity changes of cerium oxides were determined using first principles calculations and are found to be consistent with literature *** present data indicate that the cerium oxide inclusion nucleation pathway can be summarized as[Ce]+[O]→(CeO_(2))n/(Ce_(2)O_(3))_(n)→(Ce_(2)O_(3))_(n)→(Ce_(2)O_(3))_(2)→core(Ce_(2)O_(3)crystal)-shell((Ce_(2)O_(3))_(2) cluster)nanoparticles→(Ce_(2)O_(3))bulk.

关键词： Cerium oxide inclusion Classical nucleation theory Two-step nucleation mechanism First principles Rare earths

Atomic force microscopy studies of SrTiO_(3)(001.substrates treated by chemical etching and annealing in oxygen

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Science china({1.,Mechanics & Astronomy) 2005年第4期48卷 459-468页

作者： wang Xu1. FEI Yiyan1. LU Huibin1. JIN Kui-juan1. ZHU Xiangdong1.3, {1. Zhenghao1. ZHOU Yueliang1.& YANG Guozhen1.1. beijing National Laboratory for Condensed Matter physics,Institute of physics,Chinese Academy of Sciences,beijing 1.0080,china 2. department of physics,University of California, Davis,California,USA beijing National Laboratory for Condensed Matter {1. Institute of Physics Chinese Academy of Sciences Beijing China department of {1. University of California Davis USA

The SrTiO3 (001. substrates treated by chemical etching in NH4F-buffered HF solution and annealing in oxygen ambient have been studied by an atomic force microscopy (AFM). The SrTiO3 substrates with TiO2-termineted and atomically smooth surfaces and single unit cell steps have been obtained. The surface morphologies of SrTiO3 substrates strongly depend on the treated conditions and the quality of the substrates.

关键词： SrTiO3, AFM, surface morphology, surface defects.

Efficient ammonia electrosynthesis from nitrate via a three-step relay mechanism

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Science china Chemistry 2024年第1期67卷 319-320页

作者： Haifeng Jiang Gao-Feng chen Haihui {1. beijing Key Laboratory for Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China department of Colloid Chemistry Max-Planck Institute of Colloids and InterfacesPotsdam 14476Germany School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China

Electrocatalytically converting nitrate waste to value-added ammonia(NO3−RR)is beneficial to environmental restoration and an attractive candidate for green ammonia production[1..However,developing NO_(3)^(-)RR in an energy-saving way remains a significant challenge due to the slow kinetics inherent in multi-step electron and proton transfer,making previous investigations for NO_(3)^(-)RR generally operate at a large overpotential(2 V versus reversible hydrogen electrode(RHE))to achieve optimal efficiency and industrial current for NH3 synthesis[2].

关键词： ammonia nitrate kinetics

SUB1.promotes colorectal cancer metastasis by activating NF-κB signaling via UBR5-mediated ubiquitination of UBXN1

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Science china(Life Sciences) 2024年第6期67卷 1199-1211页

作者： Hao wang Wenwen {1. Yanting wang Yuzhen Gao Zizhen Zhang Shuyi Mi Liangjing wang Meng Xue department of Gastroenterology The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China Institution of Gastroenterology Zhejiang UniversityHangzhou 310058China department of Clinical Laboratory Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China department of Gastrointestinal Oncology Key Laboratory of Carcinogenesis and Translational Research(Ministry of Education/Beijing)Peking University Cancer Hospital and InstituteBeijing 100142China

Metastasis accounts for the major cause of colorectal cancer(CRC)related mortality due to the lack of effective *** this study,we integrated the single-cell RNA-seq(sc RNA-seq)and bulk RNA-seq data and identified the transcriptional coactivator SUB1.homolog(SacSaccharomyces cerevisiae)/PC4(positive cofactor 4)associated with CRC *** SUB1.expression was correlated with advanced tumor stage and poor survival in *** vivo and vitro assays showed that SUB1.depletion could inhibit the invasive and metastatic abilities of CRC ***1.activated NF-κB signaling and its transcriptional target genes CXCL1.and CXCL3 to drive CRC ***,SUB1.integrated with the E3 ubiquitin-protein ligase UBR5 and increased its protein level in CRC ***,the increased UBR5mainly mediated Lys1.-linked polyubiquitination and degradation of NF-κB negative regulator UBXN1.thus to activate the NF-κB ***,our study demonstrated that SUB1.promoted CRC progression by modulating UBR5/UBXN1.and activating NF-κB signaling,providing a new therapeutic strategy for treating metastatic CRC through targeting SUB1.

关键词： colorectal cancer Metastasis SUB1 UBR5 NF-κB signaling

Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr1.Si1.o Bearing Steel

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 703-712页

作者： Yan-Hui wang Hua-Qiang Sun Wen-Jing Feng Lei-Jie Zhao Xiang {1. Qing-An {1. Hai-Tao Sun Jian-Jun wang Zhi-Nan Yang Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province School of Mechanical and Equipment EngineeringHebei University of EngineeringHandan056038China Collaborative Innovation Center for Modern Equipment Manufacturing of Jinan New Area Hebei University of EngineeringHandan056038China School of Materials Science and Engineering Tsinghua UniversityBeijing100084China Avic Shang da Superalloys Company Limited Xingtai054800China National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao066004China

In this study, a high-carbon nano-bainitic GCr1.Si1.o bearing steel was investigated. Specifically, the effects of content and size of undissolved carbides on the microstructure and transformation kinetics of nano-bainite were analyzed. The results demonstrated that after prolonged austempering at low temperatures, the mixed microstructure composed of nano-bainite (NB), undissolved carbides (UC), and retained austenite (RA) was obtained in GCr1.SiMo steel. When the experimental steel was austenitized at 900 ℃, the undissolved carbides gradually dissolved until reaching a stable state with increasing holding time. Furthermore, at the same austempering temperature, despite different volume fractions of undissolved carbides in the substrate, the volume fractions of nano-bainite in the final microstructures remained essentially the same. Moreover, the higher the content of undissolved carbides in steel, the faster the transformation rate of nano-bainite and the shorter the total transformation time.

关键词： Nano-bainite Undissolved carbides Bainitic transformation kinetics Carbon concentration

Rapid characterization of non-volatile phenolic compounds reveals the reliable chemical markers for authentication of traditional Chinese medicine Xiang-ru among confusing Elsholtzia species

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Chinese Journal of Natural Medicines 2024年第4期22卷 375-384页

作者： ZENG Zhen ZhanG {1. HU Jiadong wang Feiyan WU Ziding wang Jing ZhanG Jun YANG Shuda {1. Junfeng LI Mingming TONG Qi QIU Shi {1. Wansheng The SATCM Key Laboratory for New Resources&Quality Evaluation of Chinese Medicine Institute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineShanghai 201203China department of Pharmacy Second Affiliated Hospital of Navy Medical UniversityShanghai 200003China Kunming Plant Classification Biotechnology Co. Ltd.Kunming 650500China School of Pharmaceutical Sciences and Yunnan Key Laboratory of Pharmacology for Natural Products Kunming Medical UniversityKunming 650500China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs Beijing100700China

The aerial parts of Mosla chinensis *** Mosla chinensis cv.'Jiangxiangru'(MCJ)are widely utilized in traditional Chinese medicine(TCM),known collectively as ***,due to clinical effectiveness concerns and frequent misidentification,the original plants have increasingly been substituted by various species within the genera Elsholtzia and *** challenge in distinguishing between these genera arises from their similar morphological and metabolic *** address this issue,our study introduced a rapid method for metabolic characterization,employing high-resolution mass spectrometry-based *** detailed biosynthetic and chemometric analyses,we pinpointed five phenolic compounds—salviaflaside,cynaroside,scutellarein-7-O-D-glucoside,rutin,and vicenin-2—among 203 identified compounds,as reliable chemical markers for distinguishing Xiang-ru from closely related Elsholtzia *** methodology holds promise for broad application in the analysis of plant aerial parts,especially in verifying the authenticity of aromatic traditional medicinal *** findings underscore the importance of non-volatile compounds as dependable chemical markers in the authentication process of aromatic traditional medicinal plants.

关键词： Genus Elsholtzia Genus Mosla Traditional Chinese medicine Xiang-ru Non-volatile phenolic compounds Liquid chromatography-mass spectrometry

Honokiol inhibits arterial thrombosis through endothelial cell protection and stimulation of prostacyclin

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Acta Pharmacologica Sinica 2005年第9期26卷 1063-1068页

作者： He HU~1.Xiao-xue ZhanG~1.Yin-ye {1.~(1.2) Shi-zhong chen~31.department of Molecular and Cellular Pharmacology beijing University beijing 1.0083,china 3 department of Natural Medicinal Chemistry,School of Pharmaceutical Sciences,Peking University beijing 1.0083,china department of Molecular and Cellular Pharmacology Beijing University Beijing China department of Natural Medicinal Chemistry School of Pharmaceutical Sciences Peking University Beijing China

Aim:To study the effect of honokiol on arterial thrombosis and endothelial ***:Rabbit platelet aggregation was performed with Born's turbid *** was produced by the endothelial injury stimulated with electric *** aortic endothelial cells（RAEC）were cultured and cell viability was assessedusing the MTT *** oxide（NO）concentrations in serum-free media ofRAEC were determined using the kinetic cadmium-reduction *** stablemetabolite prostacyclin was measured in serum-free media of RAEC ***:Honokiol（37.6-376 lamol/L）decreased rabbit plate-let aggregation in vitro in a concentration-dependent manner,while intravenouslyinjection of honokiol（0.1.-1. μg/kg）significantly inhibited rabbit platelet aggre-gation induced by collagen ex *** the electrical current-stimulated carotidthrombosis model in rats,honokiol（5-50 μg/kg,iv）prolonged the thrombus oc-clusion time in a does-dependent *** vitro honokiol（0.376-37.6 μmol/L）effectively protected cultured RAEC against oxidized low density lipoprotein（ox-LDL ）injury,and significantly increased 6-keto-PGF1.（the stable metabolite ofprostacyclin）in serum-free media of *** also increased NO level inRAEC serum-free medium at a lower concentration range（0.0376-0.376 μmol/L）,but honokiol 3.76 μmol/L decreased NO ***:Honokiol is a potentarterial thrombosis *** cell protection and the stimulation ofprostacyclin release may be its main anti-thrombosis *** ofNO release in endothelial cells may play a role,but it is not a key factor.

关键词： honokiol platelet aggregation thrombosis cultured cells endothelium prostacyclin nitric oxide

Approaches to improving critical current density of YBCO superconducting thick films deposited by electrophoresis

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Science china({1.,Mechanics & Astronomy) 2004年第2期47卷 165-172页

作者： ZHU Yabin1.2, ZHOU Yueliang2, LIU Zhen2, wang Shufang2, {1. Zhenghao2, L?Huibin2, YANG Guozhen2, XIAO Ling3, REN Hongtao3, JIAO Yulei3 & ZHENG Minghui3 1. department of physics, College of Science, beijing Jiaotong University, beijing 1.0044, china 2. Laboratory of Optical physics, Institute of physics and Center for Condensed Matter physics, Chinese Academy of Sciences, beijing 1.0080, china 3. General Research Institute for Nonferrous Metals, beijing 1.0088, china Correspondence should be addressed to Zhu Yabin (email: ybzhu@***) department of {1. College of Science Beijing Jiaotong University Beijing China Laboratory of Optical physics Institute of physics and Center for Condensed Matter physics Chinese Academy of Sciences Beijing China General Research Institute for Nonferrous Metals Beijing China

Fabrication of YBCO superconducting thick films by electrophoresis has been widely reported. However, the value of critical current density (J c) is far from what the practical application requires. The superconducting thick films are obtained using top-seeded melt growth method with different proportional Y2BaCuO5 (Y21.) addition. High-pressure oxygen has been used in the annealing process to improve the uniformity of the oxygen content in the superconducting thick films. When 40mol% Y21. powder is added to the YBa2Cu3O7–5 (Y1.3) powder,J c for the superconducting thick film by approaches described above reaches 7.008×1.3 A/cm2 (77 K, 0 T), which is greater than the value ever reported.

关键词： YBCO thick films, electrophoretic deposition, melt-textured.

Narrow line Seyfert 1.galaxies: where are the broad line regions?

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Science china({1.,Mechanics & Astronomy) 2010年第12期53卷 2307-2311,2339-2343页

作者： MAO WeiMing 1,2,3 , HU chen 2 , wang JianMin 2 , BIAN WeiHao 4 , ZhanG Shu 2 & ZHAO Gang 1.1 Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, beijing 100012, china 2 Key Laboratory for Particle Astrophysics, Institute of High Energy physics, Chinese Academy of Sciences, beijing 100049, china 3 Graduate University of the Chinese Academy of Sciences, beijing 100049, china 4 department of physics, Nanjing Normal University, Nanjing 210011, china Key Laboratory of Optical Astronomy National Astronomical Observatories Chinese Academy of Sciences Beijing China Key Laboratory for Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing China Graduate University of the Chinese Academy of Sciences Beijing China department of {1. Nanjing Normal University Nanjing China

A sample consisting of 21. narrow line Seyfert 1.galaxies (NLS1.) with high quality spectra from the Sloan Digital Sky Survey (SDSS) is selected to explore where broad line regions are in these objects. We find that the Hβ profile can be fitted well by three (narrow, intermediate and broad) Gaussian components, and the FWHM ratios of the broad to the intermediate components hold a constant of 3.0 roughly for the entire sample. If the broad components originate from the region scaled by the well-determined Hβ reverberation mapping relation, we find that the intermediate components originate from the inner edge of the torus, which is scaled by dust K-band reverberation. We find that the IC and the BC are strongly linked dynamically, but the relation of their covering factors is much more relaxed, implying that both regions are clumpy.

关键词： black hole physics galaxies: evolution quasars: general