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Regulation of Ti(C,N)deposition on hot surface of refractory in blast furnace hearth

Journal of Iron and Steel Research International 2024年第6期31卷 1423-1435页

作者： jian Cao Cui Wang Jjan-liang Zhang Ke-xin Jiao Guo-hua Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Ti(C,N)concentration was found to be lower on the hearth sidewall of a blast furnace and increased gradually toward the bottom of the blast *** Ti(C,N)protective layer in a blast furnace is ***,the formation of a Ti(C,N)protective layer was promoted by studying the heterogeneous nucleation principle of titanium compounds on different substances and regulation measures for the deposition process of titanium compounds on refractories or *** lattice disregistry between the titanium compounds and the main components in the refractory or the main impurities in the protective layer was calculated using a two-dimensional disregistry equation to study the heterogeneous nucleation principle of titanium *** results revealed that in refractory materials,the heterogeneous nucleation of carbonitride is weak when C,SiO_(2),and Al_(2)O_(3) are used as heterogeneous nucleation substrates,and the heterogeneous nucleation of carbonitride is strong when TiO_(2) and SiC are used as heterogeneous nucleation *** nucleation phases,TiC,TiN,Ti(C_(0.3),N_(0.7)),and Ti(C_(0.5),N_(0.5))have similar heterogeneous nucleation ability in single component refractory,and the type of carbonitride has little effect on the lattice *** impurities in the protective layer as the substrate phases are not conducive to the heterogeneous nucleation of *** CaS was used as the substrate phase,the heterogeneous nucleation ability of carbonitride was the *** carbon and alumina were not conducive to the heterogeneous nucleation of carbonitride,but carbon was more unfavourable than alumina.

关键词： Ti(C,N) Lattice disregistry Lattice constant Heterogeneous nucleation Regulation measure

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Core-shell nanoparticle enhanced Raman spectroscopy in situ probing the composition and evolution of interfacial species on PtCo surfaces

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Nano Research 2024年第6期17卷 4687-4692页

作者： Jing liu Han-liang Zhong Xiangyu li Mu-Fei Yue Wei-Min Yang Xueqiu You Jing-hua Tian Yao-Hui Wang jian-Feng li Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent Processing School of Ocean Information EngineeringJimei UniversityXiamen 361021China College of Chemistry Fuzhou UniversityFuzhou 350108China State Key Laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China

The composition and evolution of interfacial species play a key role during electrocatalytic *** the structural evolution and intermediate during catalytic process by in situ characterization can shed new light on the electrocatalytic reaction mechanism and develop highly efficient ***,directly probing the interfacial species is extremely difficult for most spectroscopic techniques due to complicated interfacial environment and ultra-low surface ***,electrochemical core-shell nanoparticle enhanced Raman spectroscopy is utilized to probe the composition and evolution processes of interfacial species on Au@Pt,Au@Co,and Au@PtCo core-shell nanoparticle *** spectral evidences of interfacial intermediates including hydroxide radical(OH*),superoxide ion(O_(2)^(−)),as well as metal oxide species are directly captured by in situ Raman spectroscopy,which are further confirmed by the both isotopic experiment and density functional theory *** results provide a mechanistic guideline for the rational design of highly efficient electrocatalysts.

关键词： in situ Raman core-shell nanoparticle PtCo interfacial species composition and evolution

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基于低共熔溶剂同时清洗植物性食品中多种污染元素可行性研究

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食品安全质量检测学报 2024年第9期15卷 178-186页

作者：陈玉珍梁志森李建华尧向洁黄伟乾廖启照广州检验检测认证集团有限公司广州511447 国家加工食品质量检验检测中心(广东) 广州511447

目的探究基于低共熔溶剂(deep eutectic solvents,DESs)同时清洗植物性食品中多种污染元素的可行性。方法室温下,以六偏磷酸钠为氢键受体,D-葡萄糖酸、山梨醇和尿素为氢键供体制备3种新型DESs,即六偏磷酸钠-D-葡萄糖酸(sodium hexametap... 详细信息

目的探究基于低共熔溶剂(deep eutectic solvents,DESs)同时清洗植物性食品中多种污染元素的可行性。方法室温下,以六偏磷酸钠为氢键受体,D-葡萄糖酸、山梨醇和尿素为氢键供体制备3种新型DESs,即六偏磷酸钠-D-葡萄糖酸(sodium hexametaphosphate-gluconic acid,SHMP-Glc A)、六偏磷酸钠-山梨醇(sodium hexametaphosphate-sorbitol,SHMP-Sbt)及六偏磷酸钠-尿素(sodium hexametaphosphate-urea,SHMP-Ur),测定3种DESs的黏度、密度、熔点和p H,并利用傅里叶变换红外光谱法(Fourier transform infrared spectroscopy,FTIR)、热重法(thermo-gravimetry,TG)进行表征。超声辅助下,将3种DESs用于清洗植物性食品中22种污染元素,利用电感耦合等离子体质谱法(inductively coupled plasma-mass spectrometry,ICP-MS)测定清洗前后样品中7种重金属元素(Mn、Ni、Cu、Zn、Cd、Ba和Pb)、1种类金属元素(As)、14种稀土元素(La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb和Lu)的含量,并探究DESs的残留量。结果DESs的黏度、密度和熔点与氢键的形成有关,FTIR结果表明DESs中存在氢键。p H与DESs前体组分有关。SHMP-Glc A、SHMP-Sbt和SHMP-Ur的分解温度分别为185、348和167℃。与纯水清洗对照相比,DESs对植物性食品中多种污染元素的清洗效果大幅提高;变异系数法赋权综合评分显示,SHMP-Glc A对元素的去除率最优(综合评分0.6281),次之SHMP-Ur(综合评分-0.1335),SHMP-Sbt第三(综合评分-0.4946)。DESs在样品中残留的磷元素含量不超过磷酸盐类物质的每日最大容许摄入量(70 mg/kg bw,以P计)。结论制备的低挥发性的新型DESs能高效去除植物性食品中多种污染元素,在保障食品安全方面具有应用前景。

关键词：低共熔溶剂植物性食品多种污染元素清洗变异系数法

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Mast cell degranulation-triggered by SARS-CoV-2 induces tracheal-bronchial epithelial inflammation and injury

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Virologica Sinica 2024年第2期39卷 309-318页

作者： jian-Bo Cao Shu-Tong Zhu Xiao-Shan huang Xing-Yuan Wang Meng-li Wu Xin li Feng-liang liu ling Chen Yong-Tang Zheng jian-hua Wang Guangzhou Institutes of Biomedicine and Health Chinese Academy of SciencesGuangzhou 510530China School of life Sciences and Medicine University of Science and Technology of ChinaHefei 230026China Key Laboratory of Bioactive Peptides of Yunnan Province Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of SciencesKIZCUHK Joint Laboratory of Bioresources and Molecular Research in Common DiseasesCenter for Biosafety Mega-ScienceKunming Institute of ZoologyChinese Academy of SciencesKunming 650223China University of Chinese Academy of Sciences Beijing 101408China

SARS-CoV-2 infection-induced hyper-inflammation is a key pathogenic factor of *** research,along with others',has demonstrated that mast cells(MCs)play a vital role in the initiation of hyper-inflammation caused by *** previous study,we observed that SARS-CoV-2 infection induced the accumulation of MCs in the peri-bronchus and bronchioalveolar-duct junction in humanized ***,we found that MC degranulation triggered by the spike protein resulted in inflammation in alveolar epithelial cells and capillary endothelial cells,leading to subsequent lung *** trachea and bronchus are the routes for SARS-CoV-2 transmission after virus inhalation,and inflammation in these regions could promote viral *** are widely distributed throughout the respiratory ***,in this study,we investigated the role of MCs and their degranulation in the development of inflammation in tracheal-bronchial *** analyses showed the accumulation and degranulation of MCs in the peri-trachea of humanized mice infected with *** degranulation caused lesions in trachea,and the formation of papillary hyperplasia was *** transcriptome analysis in bronchial epithelial cells,we found that MC degranulation significantly altered multiple cellular signaling,particularly,leading to upregulated immune responses and *** administration of ebastine or loratadine effectively suppressed the induction of inflammatory factors in bronchial epithelial cells and alleviated tracheal injury in *** together,our findings confirm the essential role of MC degranulation in SARS-CoV-2-induced hyper-inflammation and the subsequent tissue ***,our results support the use of ebastine or loratadine to inhibit SARS-CoV-2-triggered degranulation,thereby preventing tissue damage caused by hyper-inflammation.

关键词： SARS-CoV-2 Mast cell(MC) Bronchial epithelial cell Inflammation Tracheal injury

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Inhibition of rejection in murine islet xenografts by CTLA41g and CD40lig gene transfer

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Chinese Medical Journal 2010年第21期 3106-3109页

作者： ZHANG jian li hua jianG Nan WANG Guo-ying FU Bin-sheng WANG Gen-shu YANG Yang CHEN Gui-hua J liver Transplantation Center the Third Affiliated Hospital of Sun Yat-sen University Guangzhou Guangdong 510630 China

Background Costimulatory signals play a vital role in T cell activation. Blockade of costimulatory pathway by CTLA4Ig or CD40lig have enhanced graft survival in experimental transplantation models yet mechanisms remain *** investigated the effects of CTLA4Ig and CD40lig gene transfer on islet xenografts rejection in *** Human islets were infected with recombinant adenoviruses containing CTLA4Ig and CD40lig genes and implanted beneath the kidney capsule of diabetic rats. Levels of blood sugar, morphological changes, and survival of grafts were recorded. Expressions of CTLA4Ig, CD40lig and insulin were detected by immunohistochemical staining and cytokines levels were quantified by enzyme-linked immunosorbent assay （EliSA）.Results Blood glucose levels in transplant rats decreased to normal level on the 2nd day post transplantation. The mean blood glucose in the control group, CTLA4Ig transfected group, CD40lig transfected group and CTLA4Ig ＋CD40lig cotransfected group increased on days 8, 24, 21, 68, post transplantation respectively. The grafts in control group, CTLA4Ig transfected group, CD40lig transfected group and CTLA4Ig ＋ CD40lig cotransfected group survived for （8±1）, （29±4）, （27±3）, and （74±10） days, respectively. Survival in CTLA4Ig ＋ CD40lig cotransfected group was significantly longer. Survivals of CTLA4Ig transfected group and CD40lig transfected group were significantly longer than control group. In controJ animals, serum interleukin-2 and tumor necrosis factor a concentration significantly increased within seven days post transplantation. Haematoxylin eosin staining of grafts showed live islets in situ of transplant rats without inflammatory cell infiltration. Immunohistochemical staining confirmed the expression of insulin at islets in all experimental *** Transfer of CTLA4Ig and CD40Llg genes, especially the cotransfer of both, inhibits rejection of murine islet xenografts. Downregulated expressions of Th1 cells rel

关键词： transplantation islet of Langerhans CTLA4Ig CD40lig immune tolerance

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Syntheses, Crystal Structures and Magnetic Properties of Two New Low-dimensional Manganese (Ⅱ) Coordination Compounds

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Chinese Journal of Structural Chemistry 2020年第6期39卷 1077-1086页

作者： li jian-hua WANG Xiao-Zhong WEI Hai-Wen HOU Qin LAI Xiao-Yong liU Xiang-Yu YANG Qing-Feng State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering National Demonstration Center for Experimental Chemistry EducationCollege of Chemistry and Chemical Engineering Ningxia University Yinchuan 750021China College of Chemistry and Materials Science Shandong Agricultural UniversityTaian 271018China

Two new low-dimensional Mn(Ⅱ)coordination compounds of Mn(H2pimdc)2(phen)(compound 1)and[Mn(Hpimdc)(phen)]n·nH2O(compound 2)were synthesized,where H3pimdc is a 2-propyl-imidazole-4,5-dicarboxylic acid and phen is 1,*** compounds were thoroughly analyzed by X-ray single-crystal diffraction,element analysis,IR spectra,PXRD and thermal analysis.X-ray single-crystal diffraction analyses indicate that the phen ligands terminate metal ions on two sides to prevent the linkage between the neighboring metal ions into a higher dimensional structure in compounds 1 and *** 1 is constructed from mononuclear molecules which form the 1D helical supramolecular chain by N-H···O hydrogen *** compound 2,Hpimdc is a tetradentate bridging ligand,which binds Mn(Ⅱ)ions to generate a single-stranded right helical chain parallel to the b *** 1D chains are additionally coupled by H-bonds as well asπ···πstacking interactions,which formed a 3D supramolecular ***,compound 2 demonstrated temperature-dependent magnetic susceptibility and negative value ofθ(equal to-9.09 K),which is indicative of weak antiferromagnetic interactions between Mn(Ⅱ)ions.

关键词： low-dimensional coordination compounds helical structure magnetic properties

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Cooperative enhancement of mechanical and tribological properties through tailoring TiN transition interface in boron nitride nanosheets reinforced copper composites

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Rare Metals 2024年第10期43卷 5202-5215页

作者： Zhong-hua li liang liu Xin You jian-Hong Yi Rui Bao Ming-Yi Zhu Song Lu Jun-Jun Pai Faculty of Materials Science and Engineering Kunming University of Science and Technology Key Laboratory of Advanced Materials of Yunnan Province Kunming University of Science and Technology

Strengthening interface bonding between boron nitride nanosheets(BNNS) and copper matrix is an essential prerequisite for exploiting a new generation of copper matrix composites(CMCs) with high strength and wear resistance. Herein, BNNS/Cu composites were fabricated by the powder metallurgy route, matrix-alloying(adding 1.0 wt% Ti) strategy was adopted to improve the interfacial wettability and strengthen interface adhesion. A typical "sandwich"-like multiply interface structure involving TiN transition layers, BNNS and Cu matrix had been well constructed through the rational heat treatment(900℃for 120 min). Additionally, nano-sized TiB whisker was in situ formed in the vicinity of the interface, it had linked the BNNS-Cu-TiN multiply interface, which played a role of "threading the needle" and significantly strengthened the multi-interfaces bonding. This specific interface structure was finely characterized, and the formation mechanism of solid-state interfacial reaction feature was proposed. The results demonstrated that the ultimate tensile strength(UTS) of BNNS/Cu-(Ti)-900℃ increased from 248 to 530 MPa(increased by 114%), and the coefficient of friction(COF) decreased from 0.51 to 0.28 than pure Cu. This work highlights the importance of interface configuration design, which contributes to the development of CMCs with prominent comprehensive properties.

关键词： Boron nitride nanosheets Copper matrix composites Interface structure Mechanical and frictional properties

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高超声速边界层感受性问题高精度数值模拟

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空气动力学学报 2008年第4期26卷 532-537页

作者：李建华王强中国航天空气动力技术研究院北京100074

通过五阶WENO格式和六阶对称紧致格式以及三阶TVD R-K结合的方法,对存在强激波和小扰动相互干扰的高超声速边界层感受性问题进行研究。结果表明:此方法能够模拟边界层内不稳定波的产生和发展以及小扰动和激波相互干扰等现象,因此能广泛... 详细信息

通过五阶WENO格式和六阶对称紧致格式以及三阶TVD R-K结合的方法,对存在强激波和小扰动相互干扰的高超声速边界层感受性问题进行研究。结果表明:此方法能够模拟边界层内不稳定波的产生和发展以及小扰动和激波相互干扰等现象,因此能广泛应用于含激波的感受性等问题的可压缩湍流直接数值模拟以及具有激波和边界层干扰等复杂流场的计算。

关键词： WENO格式直接数值模拟感受性

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A dephosphorylation-dependentmolecular switch for FT repression mediates flowering in Arabidopsis

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Plant Communications 2024年第3期5卷 167-178页

作者： Yu Zhang Changmei hua jian Xuan Kiang lisha Shen Temasek life Sciences Laboratory 1 Research LinkNational University of SingaporeSingapore 117604Singapore Department of Biological Sciences Faculty of ScienceNational University of SingaporeSingapore 117543Singapore

The reproductive success offlowering plants relies greatly on precise timing of thefloral transition,which isnely modulated by a complex network offloral *** a mainfloral integrator,FLOWERING LOCUS T(FT)is also an essential constituent of theflorigen that is transported from leaves to shoot apices to *** is specically transcribed in leaf vascular tissues,where its production is suppressed by manyflowering repressors,including the MYB transcription factor EARLY FLOWERING MYB PROTEIN(EFM).Here,we show that a plant CTD phosphatase,C-TERMINAL DOMAIN PHOSPHATASE-liKE 2(CPL2),suppresses FT expression in leaf vascular tissues by modulating the binding activity of ***2 interacts with and dephosphorylates EFM to facilitate the binding of dephosphorylated EFM to FT chromatin,thereby *** results suggest that CPL2-mediated dephosphorylation of thefloral repressor EFM serves as a molecular switch,adding another layer of regulation tone-tune FT transcription and ensure thatflowering occurs at an appropriate time.

关键词： CTD phosphatase MYB protein florigen FT flowering Arabidopsis

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Effect of Cr_(2)O_(3) on properties of CaO-SiO_(2)-Fe_(t)O-MgO system and dissolution behavior of lime

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Journal of Iron and Steel Research International 2024年第4期31卷 870-881页

作者： Shan-nan li jian-li li Yue Yu Hang-yu Zhu The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The productivity of the chrome-containing semi-steel converter smelting process is directly affected by the slag-forming speed during the converter preliminary *** effects of Cr_(2)O_(3) content on the physicochemical properties of the CaO-SiO_(2)-Fe_(t)O-MgO system,such as melting temperature,solidification behavior,mineral composition,and lime dissolution rate,were *** results showed that the slag was an amorphous phase at 1500℃.When Cr_(2)O_(3) was added,Ca(Fe,Mg)Si_(2)O_(6) and spinel were formed in the *** the increase in Cr_(2)O_(3) content,the amount of spinel precipitation increased,and the dendritic FegO_(4) crystal gradually changed into the granular(Fe,Mg)(Fe,Cr)2O_(4) *** the Cr_(2)O_(3) content increased from O to 2.91 wt.%,the melting temperature of the slag rose,and the melting range of the slag expanded slightly,but the lime dissolution rate did not *** the Cr_(2)O_(3) content further increased to 9.09 wt.%,the melting temperature continued to rise,the melting range rapidly expanded,and the lime dissolution rate decreased.

关键词： Cr_(2)O_(3) Vanadium-titanium magnetite Converter Slag lime dissolution

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