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Softening–melting–dripping characteristics and evolution mechanism of vanadium-bearing titanomagnetite carbon composite briquette used as novel blast furnace burden

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Journal of Iron and Steel Research International 2021年第9期28卷 1082-1094页

作者： wei Zhao Man-sheng chu Hong-wei Guo Zheng-gen Liu Bing-ji Yan School of Iron and Steel Soochow UniversitySuzhou215137JiangsuChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819LiaoningChina

Vanadium-bearing titanomagnetite carbon composite briquette(VTM-CCB)was proposed as an innovative and promising blast furnace burden to realize low-carbon and high-efficiency *** optimize the compositions of VTM-CCB based on its softening–melting–dripping characteristics,the evolution behavior and mechanisms of VTM-CCB in cohesive zone and dripping zone were investigated by conducting softening–melting tests under blast furnace *** results show that the structure evolution of VTM-CCB in softening–melting process is correlated to the molten slag,metallic iron,liquid iron,and residual *** the molar ratio of the fixed carbon to the reducible oxygen in iron oxides(FC/O ratio)ranging from 0.8 to 1.0,the VTM-CCB tends to form dense structure and accelerate the softening and *** increasing the FC/O ratio to 1.2 and 1.4,the VTM-CCB tends to form concentric circular structure,which could suppress the collapse of packed bed,shift down the location of core cohesive zone,and improve the gas *** the appropriate increase in FC/O ratio could improve the softening–melting performance of VTM-CCB,a higher FC/O ratio could also promote the precipitation of Ti(C,N),thereby thickening the molten mixtures and deteriorating the dripping *** considering the softening–melting–dripping characteristics and permeability,the appropriate FC/O ratio of VTM-CCB should be controlled in the range of 1.0–1.2.

关键词： Vanadium-bearing titanomagnetite carbon composite briquette FC/O ratio Softening-melting-dripping characteristic Ti(C,N) Blast furnace

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Optimization of preparation process of high-strength pellets from Panzhihua ilmenite concentrate

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Journal of Iron and Steel Research International 2023年第12期30卷 2391-2402页

作者： Gang-wei Zhou wei Lv Fu-rong Chen Zheng-gen Liu Man-sheng chu Xue-wei Lv School of Metallurgy Northeastern UniversityShenyang110819LiaoningChina College of Materials Science and Engineering Chongqing UniversityChongqing400044China

The preparation of high-strength pellets from Panzhihua ilmenite concentrate is important for the hydrogen-rich smelting of titania slag and was *** effects of the magnetite concentrate and heating procedure including the pre-heating temperature and period as well as roasting temperature and period on the compressive strength of the roasted pellets were ***-strength ilmenite concentrate pellets(>2000 N)were prepared by optimizing the roasting *** addition of magnetite concentrate is beneficial for increasing the compressive strength of the Panzhihua ilmenite concentrate pellet by oxidizing hematite which filled the pseudobrookite particles,functioned as a bridge bond,and improved the interconnection between the *** compressive strength can reach up to 2900 N when the ilmenite concentrate pellet with 15%magnetite concentrate is pre-heated above 800℃ for 20 min and then roasted at 1250℃ for 20 *** addition,there is an overall upward trend in the compressive strength with an increase in the pre-heating temperature and period as well as the roasting temperature and *** micromorphology and strengthening consolidation mechanism of Panzhihua ilmenite concentrate pellets were also discussed.

关键词： Ilmenite concentrate Pelletizing Roasting Compressive strength-Pellet

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Recent advances in the study of(-)clausenamide:chemistry,biological activities and mechanism of action

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Acta Pharmaceutica Sinica B 2014年第6期4卷 417-423页

作者： shi-feng chu Jun-tian Zhang Institute of Materia Medica Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China

Clausenamide(clau)is one of seven novel compounds isolated from Clausena lansium(Lour)*** is unusual in that it contains 4 chiral centers yielding 8 pairs of *** identification of the configuration of these enantiomers,the synthesis of 16 enantiomers,including optically active clau and(+)and(-)clau was carried *** this study,many stereochemical and synthetic difficulties were solved and the Baldwin principle was *** scale is now sufficient to meet the needs of clinical *** a pharmacological study numerous models and indicators showed that(-)clau is the active enantiomer,while(+)clau is inactive and elicits greater toxicity than(-)*** principal pharmacological effects of(-)clau are to increase cognition,demonstrated in ten models of memory impairment,as well as to inhibitβ-amyloid(Aβ)toxicity,blocking neurofibrillary tangle formation by inhibiting the phosphorylation of tau *** anti-dementia effect is characterized by increased synaptic plasticity both in efficacy and in structure and provides new support for the theory that synaptic loss is the main cause of dementia.(-)Clau is considered to be a promising drug candidate for treatment of Alzheimer's disease and other neurodegenerative disorders.

关键词： (-)Clausenamide Enantiomers Cognition Alzheimer's disease pathology Tau High phosphorylation Synaptic plasticity

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Visual and auditory cues facilitate cache pilferage of Siberian chipmunks(Tamias sibiricus)under indoor conditions

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Integrative Zoology 2019年第4期14卷 354-365页

作者： Hongyu NIU wei chu Xianfeng YI Hongmao ZHANG Institute of Ecology and Evolution School of Life SciencesCentral China Normal UniversityWuhanChina College of Life Sciences Jiangxi Normal UniversityNanchangChina Xiamen Shuangshi High School at Haicang XiamenChina.

In the struggle for survival,scatter-hoarding rodents are known to cache food and pilfer the caches of *** extent to which rodents utilize auditory/visual cues from conspecifics to improve cache-pilfering is un***,Siberian chipmunks(Tamias sibiricus)were allowed to search for caches of Corylus heterophylla seeds(man-made caches and animal-made caches)after experiencing cues from a conspecific’s cache-searching *** each type of cache,3 experimental scenarios were presented:(1)alone(control);(2)auditory/visual(hearing and seeing conspecific’s cache-searching events);and(3)auditory only(hearing conspecific’s cache-searching events only)with random *** subjects located man-made caches faster,harvested more caches,and hoarded more seeds both in the auditory/visual and the auditory only treatments compared to the control,while scatter-hoarding more seeds in the auditory/visual treatment but larder-hoarding more seeds in the auditory only *** to the control,the animals spent less time locating animal-made caches,harvested more caches,ate fewer seeds,larder-hoarded more seeds and hoarded more seeds in total both in the auditory/visual and the auditory only treatments,while eating more seeds and hoarded fewer seeds in total in the auditory only treatment than in the auditory/visual *** results also show that females spent less time locating the animal-made caches,but they scatter-hoarded fewer seeds than males in the auditory/visual treat*** the best of our knowledge,this is the first report that visual and/or auditory cues of conspecifics improve cache-pilfering and hoarding in rodents.

关键词： cache pilferage cache protection food hoarding observational spatial memory rodents

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Changes in gas exchange,root growth,and biomass accumulation of Platycladus orientalis seedlings colonized by Serendipita indica

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Journal of Forestry Research 2019年第4期30卷 1199-1207页

作者： chu Wu Qiao wei Jing Deng Wenying Zhang College of Horticulture and Gardening Yangtze UniversityJingzhou 434025HubeiPeople's Republic of China Institute of Root Biology Yangtze UniversityJingzhou 434025HubeiPeople's Republic of China College of Agricultural Sciences Yangtze UniversityJingzhou 434025HubeiPeople's Republic of China

Serendipita indica(formerly known as Piriformospora indica),a root endophytic fungus,exhibits multiple functions in some agricultural,horticultural,and medicinal plant *** studied colonization of the roots of Platycladus orientalis,a forest tree species,by *** to improve the quality of the seedlings in seedbeds and survival rates in *** 20 days after inoculation,*** colonized the root cortex of *** *** colonization by *** significantly increased net CO2 assimilation,light use efficiency,and biomass accumulation by both roots and shoots,whereas it did not affect the biomass allocation between roots and *** addition,the symbiosis significantly increased root total length,surface area,and *** view of the two specific traits of ***,i.e.,axenic culture and wide colonization in plants,the fungus might be used for improving quality of *** seedlings and increasing their survival after transplanting.

关键词： Biomass NetCO2 assimilation Serendipita indica Root growth Symbiosis

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Surface Modification of Bituminous Coal and Its Effects on Methane Adsorption

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Chinese Journal of Chemistry 2013年第8期31卷 1102-1108页

作者： Yanyan Feng Wen Yang Daijun Liu[*] wei chu[*] Department of Chemical Engineering Sichuan University Chengdug Sichuan 610065 China Email: Daijun Liu (liudj721@***) Wei Chu (chuwei1965scu@***)[*]Department of Chemical Engineering Sichuan University Chengdug Sichuan 610065 China Tel.: 0086-028-8540 3836

This paper studied the role of O-containing groups over the coal surface in methane adsorption. The coal was modified with H2SO4, （NH4）2S208 or H2SO4/（NH4）2S2Os）, respectively, to introduce O-containing functional groups, and characterized by proximate analysis, ultimate analysis, Boehm titration, X-ray photoelectron spectroscopy （XPS） and nitrogen adsorption. The results of ultimate analysis, Boehm titration and XPS indicate that there were increases in terms of both the content of oxygen and the quantities of O-containing groups over the modified coals surface, especially for the carboxyl. Nitrogen adsorption shows that the modified coals possessed higher surface area and pore volume than that of 0-XQ. The methane adsorption data were measured at 298 K at pressures up to 4.0 MPa by the volumetric method and fitted well by Langmuir model. Experimental results implied that O-containing groups and pore structure affected methane adsorption. The adsorption capacities decreased as increasing quantities of O-containing groups.

关键词： modification O-containing groups pore structure methane adsorption

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Computing Optimal Interfacial Structure of Modulated Phases

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Communications in Computational Physics 2017年第1期21卷 1-15页

作者： Jie Xu chu Wang An-Chang shi Pingwen Zhang LMAM and School of Mathematical Sciences Peking UniversityBeijing 100871China Program in Applied and Computational Mathematics Princeton UniversityPrincetonNew Jersey 08544USA Department of Physics and Astronomy McMaster UniversityHamiltonOntario L8S4M1Canada

We propose a general framework of computing interfacial structures between two modulated *** we propose to use a computational box consisting of two half spaces,each occupied by a modulated phase with given position and *** boundary conditions and basis functions are chosen to be commensurate with the bulk *** observe that the ordered nature of modulated structures stabilizes the interface,which enables us to obtain optimal interfacial structures by searching local minima of the free energy *** framework is applied to the Landau-Brazovskii model to investigate interfaces between modulated phases with different relative positions and *** types of novel complex interfacial structures emerge from the calculations.

关键词： Interface modulated phase metastable state compatibility Landau-Brazovskiimodel

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A review of experimental advances in twisted graphene moiré superlattice

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Chinese Physics B 2020年第12期29卷 17-23页

作者： Yanbang chu Le Liu Yalong Yuan Cheng Shen Rong Yang Dongxia shi wei Yang Guangyu Zhang Beijing National Laboratory for Condensed Matter Physics Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China

Twisted moirésuperlattice receives tremendous interests since the discovery of correlated insulating states and superconductivity in magic angle twist bilayer graphene(MA-TBG)[Nature 55680(2018),Nature 55643(2018)],even gives arise to a new field"twistronics"[Science 361690(2018)].It is a new platform hosting strong electron correlations,providing an alternative for understanding unconventional *** this article,we provide a review of recent experimental advances in the twisted moirésuperlattice,from MA-TBG to twisted double bilayer graphene and other two-dimensional materials based moirésuperlattice,covering correlated insulating states,superconductivity,magnetism,et al.

关键词： twisted 2D moirésuperlattice electron correlations superconductivity magnetism

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The magnification invariant of circularly-symmetric lens models

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Research in Astronomy and Astrophysics 2018年第7期18卷 63-72页

作者： Cheng-Liang wei Zhe chu Yi-Ping Shu Purple Mountain Observatory the Partner Group of MPI fur AstronomieNanjing 210033China University of Chinese Academy of Sciences Beijing 100049China School of Astronomy and Space Sciences University of Science and Technology of ChinaHefei 230029China

In the context of strong gravitational lensing, the magnification of an image is crucially important for constraining various lens models. For several commonly used quadruple lens models, the magnification invariants, defined as the sum of the signed magnifications of images, have been analytically derived when the image multiplicity is a maximum. In this paper, we further study the magnification of several disk lens models, including （a） exponential disk lens, （b） Gaussian disk lens, （c） modified Hubble profile lens, and another two of the popular three-dimensional symmetrical lens models, （d） NFW lens and （e） Einasto lens. We find that magnification invariant exists for each lens model. Moreover, our results show that magnification invariants can be significantly changed by the characteristic surface mass density kc.

关键词： gravitational lensing strong-methods numerical

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Nanostructure Architectures of Tungsten Carbide for Methanol Electrooxidation Catalyst

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Chinese Journal of Chemistry 2016年第6期34卷 624-630页

作者： Yekun Jiang Meiqin shi Xue Tong Youqun chu chunan Ma State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology College of Chemical Engineering Zhejiang University of Technology Hangzhou Zhejiang 310032 China

We reported a novel protocol to efficiently synthesize tungsten carbide （WC） nanomaterials with pure crystal structure and certain specific morphology. The key step in this protocol is the preparation of the catalyst precursor W18049 with surface oxygen vacancies. The existence of large quantities of oxygen vacancies gives plenty channels for diffusion and keeps the specific morphology of WC in the carbonization process. Efforts to build WC blocks with well-defined geometrical shapes （e.g., rods, wires, spheres and flakes） have further expanded its possibility to be the support for methanol electrooxidation catalyst. The platinum supported on pure phase WC materials served as an effective CO tolerant electrocatalyst for methanol oxidation. Electrochemical experiments indicated that the improved catalytic activity was related to the special morphologies of WC supports. Its sea urchin like feature leads to substantial interfaces between WC and Pt by preparing more anchor points for Pt loading and also the barriers for the subsequent crystal growth, which enhances the synergistic effect between WC and Pt.

关键词： carbides oxygen vacancy 3-dimensional block electrochemistry

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