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numerical simulation on gas-solid flow during circulating fluidized roasting of bauxite by a computational particle fluid dynamics method

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Particuology 2024年第7期90卷 179-188页

作者： Chengming Xie Rongbin Li Qijin Wei Fengqin liu hongliang Zhao y.ngmin Zhang hong y.ng Sohn State Key Laboratory of Green and Low-carbon Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China BGRIMM Technology Group Beijing 100160China State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Department of Materials Science and Engineering The University of UtahSalt Lake CityUT 84112USA

A full-cycle numerical simulation of a circulating fluidized bed(CFB)by the use of the computational particle fluid dynamics(CPFD)method has been *** effects of the presence or absence of the secondary air,different secondary air positions,and different secondary air ratios on the gas–solid flow characteristics were *** results show that the presence of the secondary air makes a core-annular structure of the velocity distribution of particles in the fluidized bed,which enhances the uniformity of particles’distribution and the stability of *** position and the ratio of the secondary air have a significant impact on the particle distribution,particle flow rate,and gas flow rate in the fluidized *** the secondary air position and ratio are optimal,the particles,particle flow rate,and air flow rate in the CFB are evenly distributed,the gas–solid flow state is good,and the CFB can operate stably.

关键词： Circulating fluidized bed CPFD method Secondary air position Secondary air ratio Gas–solid flow characteristics

new process for treating boron-bearing iron ore by flash reduction coupled with magnetic separation

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 473-484页

作者： Qipeng Bao Lei Guo hong y.ng Sohn Haibin Zuo Feng liu y.ngliang Gao Zhancheng Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Department of Materials Science&Engineering University of UtahUtah 84112USA China EnFI Engineering Corporation Beijing 100038China

Boron is an important industrial raw material often sourced from minerals containing different compounds that cocrystallize,which makes it difficult to separate the mineral phases through conventional *** study proposed a new treatment called flash reduction-melting separation(FRMS)for boron-bearing iron *** this method,the concentrates were first flash-reduced at the temperature under which the particles melt,and the slag and the reduced iron phases disengaged at the particle *** reduc-tion and melting effects were achieved above 1550℃.The B_(2)O_(3) content in the separated slag was over 18wt%,and the B content in the iron was less than 0.03wt%.The proposed FRMS method was tested to investigate the effects of factors such as ore particle size and tem-perature on the reduction and melting steps with and without pre-reducing the raw *** mineral phase transformation and morphology evolution in the ore particles during FRMS were also comprehensively analyzed.

关键词： ludwigite boron-bearing iron concentrate flash reduction melting separation boron

Improving Thermal-oxidative Aging Resistance of Styrene-butadiene Rubber by Antioxidant Loaded Silica Aerogel

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Chinese Journal of Polymer Science 2024年第8期42卷 1198-1209页

作者： Xue-Fei Ping yu Wang Lu liu Fu-y.ng liu hong-Wei He Pi Wang Wen-Wen yu Qiang Zheng College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

The antioxidant n-isopropyl-n'-phenyl-p-phenylenediamine(4010nA)was dissolved in ethanol and impregnated into silica aerogel(SAG)via vacuum-pressure cycles,yielding composite particles(A-n)with enhanced sustained-release and reinforcing *** effect of A-n on the mechanical properties and thermal-oxidative aging resistance of styrene-butadiene rubber(SBR)vulcanizates was *** and BET assessments indicated that the loading efficiency of 4010nA in SAG reached 14.26%within ethanol's solu bility *** A-n into SBR vulcanizates significantly elevated tensile strength by 17.5%and elongation at break by 41.9%over those with fumed silica and ***,A-n notably enhanced the thermal-oxidative aging resistance of *** aging for 96 h at 100℃,the tensile strength and elongation at break of SBR with A-n sustained 70.09%and 58.61%of their initial values,respectively,with the retention rate of elongation at break being 62.8%higher than that of SBR with fumed silica and free *** study revealed that A-n composite particles significantly inhibited the crosslinking in SBR's molecular chains,reducing hardening and embrittlement during later thermal-oxidative aging stages.

关键词： Styrene-butadiene rubber Silica aerogel Loading modification Thermal-oxidative aging

Effectively improving the extreme-pressure capacity of a class of intercalated zirconium phosphate materials

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Science China(Technological Sciences) 2024年第3期67卷 753-764页

作者： nIU WenXing ZHAO XinRui yUAn Min HOU ZhiGuo liu Lei XU hong DOnG JinXiang Shanxi Key Laboratory of Chemical Product Engineering Cllege of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024China School of Chemical and Environmental Engineering Pingdingshan UniversityPingdingshan 467000China

We studied different long-chain ammonium ions intercalated zirconium phosphate α-ZrP, methylamine intercalated ZrP(MAZrP), tetramethylammonium hydroxide intercalated ZrP(TMAH-ZrP), dodecyltrimethylammonium bromide intercalated ZrP(DTAB-ZrP), and stearyl trimethyl ammonium bromide intercalated ZrP(STAB-ZrP) as grease co-additives in combination with isobutylene sulfide(SIB). The grease with co-additives displayed excellent extreme-pressure and anti-wear ***, the combination of the longest chain ammonium ion intercalated zirconium phosphate, STAB-ZrP/SIB, had the best tribological properties. In comparison to α-ZrP, the advantage of STAB-ZrP was that it did not form a large area of the dense physical film like α-ZrP on the worn surface, but rather gave the SIB a chance to contact with the fresh metal surface to generate a chemical film. Therefore, the sub-micron physical film and nanoscale chemical film always exist side by side on the contact surface during the friction process. This intercalated α-ZrP/SIB additive has great potential for use in harsh operating conditions.

关键词： intercalatedα-ZrP/SIB physical film chemical film tribological properties

Advances in the pathogenic, genetic and immunological studies of leprosy

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hLife 2024年第1期2卷 6-17页

作者： Zihao Mi hong liu Furen Zhang Shandong Provincial Hospital for Skin Diseases&Shandong Provincial Institute of Dermatology and Venereology Shandong First Medical University&Shandong Academy of Medical SciencesShandongChina

Leprosy is an infectious granulomatous disease caused by Mycobacterium leprae that affects the skin and can lead to deformity by damaging peripheral *** leprosy is no longer an incurable disease,its epidemic has not been well controlled because of its unclear routes of transmission and the lack of an effective ***,leprosy has long been an ideal disease model for the study of genetics and immunology of infectious diseases due to its strong genetic predisposition and immune-dependent spectrum of clinical ***,we review the latest and important findings of the pathogenesis of *** studies have shown that the highly conserved *** is zoonotic,which further complicates the ambiguous transmission of ***,genome-wide association studies of leprosy have reported dozens of susceptibility genes,most of which are immune-related,and thus systematically elucidate the immunogenetic basis of the ***,plenty of novel mechanisms of host defense against intracellular bacterial infection and the modulation of host immunity by *** have been *** these great achievements,there are still gaps between pathogenic biology,genetics,and immunology of leprosy,limiting our in-depth understanding of leprosy *** efforts,such as multi-omics data integration and the development of viable animal models for immunogenetic studies are urgently.needed to accelerate advances in the precise prevention and treatment of leprosy.

关键词： leprosy Mycobacterium leprae genetics immunology

Orientation controlled photogenerated carriers on selfsupporting CdS/ni_(3)S_(2) paper toward photocatalytic hydrogen evolution and biomass upgrading

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Rare Metals 2024年第5期43卷 2015-2025页

作者： Xiao-y.n liu Qing Cao Gui-Xiang Li Hui liu Li-Li Zeng Li-Li Zhao Bin Chang Xi-Wen Wang hong liu Wei-Jia Zhou Institute for Advanced Interdisciplinary Research School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Institute of Chemical Sciences and Engineering Ecole Polytechnique Federale de Lausanne1015LausanneSwitzerland KAUST Catalysis Center King Abdullah University of Science and TechnologyThuwal 23955-6900Kingdom of Saudi Arabia School of Environment and Energy South China University of TechnologyGuangzhou Higher Education Mega CenterGuangzhou 510006China State Key Laboratory of Crystal Materials Shandong UniversityJinan250100China School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710054China

The appropriate regulation of band structure is an effective strategy in constructing efficient photocatalytic *** photocatalytic system mainly employs powder photocatalysts,which makes their recovery reliant on expensive separation processes and severely limits their industrial ***,we constructed a novel CdS/ni_(3)S_(2)heterostructure using free-standing and flexible nickel fiber paper as the *** regulated energy band structure achieves effective electron–hole *** as-synthesized flexible photocatalyst exhibits considerable photocatalytic activity toward the H_(2)evolution reaction under visible-light irradiation,with an H_(2)production rate of5.63μmol·cm^(-2)·h^(-1)(14.1 mmol·g^(-1)cat·h^(-1)according to the catalyst loading content).Additionally,the otherwisewasted excited holes simultaneously drive organic transformations to yield value-added organic products,thus markedly improving the photocatalytic H_(2)evolution *** a photocatalytic system is scaled up further,where a self-supported 20 cm×25 cm sample achieves a champion H_(2)production rate of 60-80μmol·h^(-1)under practical sun *** newly developed self-supported photocatalyst produces opportunities for practical solar H2production with biomass upgrading.

关键词： Self-supporting photocatalyst CdS/ni_(3)S_(2) heterojunction Hydrogen evolution Biomass upgrading Large-scaleapplication

The Role of Family Migration in Child Development:A Propensity Score Matching Analysis Based on Migrant and non-Migrant Infants and young Children

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Frontiers of Education in China 2024年第2期19卷 138-151页

作者： hong Xiumin liu Qianqian ZHAnG Mingzhu Faculty of Education Beijing Normal UniversityBeijing 100875China Shandong Province Pre-Primary School Center Jinan 250012China

Based on the survey data of 4,739 infants and young children(IyC)under 3 years old,the study uses the propensity score matching(PSM)method to examine the role of family migration in infant and young child development(IyCD).The study finds that the development of migrant IyC is significantly behind that of non-migrant IyC in the real-world *** controlling for confounders at the individual and family levels,there is no significant statistical difference in early development between migrant IyC and non-migrant ***,family migration does not play a significant role in IyCD in different subgroups after *** protect the rights of migrant families and IyC in accessing public services,the Chinese government should build a social security policy system for migrant families and ensure starting point fairness for migrant IyC.

关键词： migrant families infants and young children(IyC) early development propensity score matching(PSM)

Climate chamber investigation of the effect of indoor thermal histories on thermal adaptation in different seasons

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Energy and Built Environment 2024年第3期5卷 455-463页

作者： yuxin Wu Angchen Jiang hong liu Baizhan Li Risto Kosonen School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhouZhejiang 310018China Joint International Research Laboratory of Green Buildings and Built Environments(Ministry of Education) Chongqing UniversityChongqing 400045China national Centre for International Research of Low-carbon and Green Buildings(Ministry of Science and Technology) Chongqing UniversityChongqing 400045China Department of Mechanical Engineering Aalto UniversityEspoo 02150Finland College of Urban Construction Nanjing Tech UniversityNanjing 210009China

The indoor thermal history of residents in the hot summer and cold winter climate zone in China have undergone a significant change in recent years,which also changes their seasonal thermal adaptations and this has formed feed-back effects to the increasing usage of air conditioning units in this *** study the seasonal variations of thermal adaptation,the thermal comfort experiments were conducted on two groups of *** groups included 20 participants who had indoor history mainly with natural ventilation(nV group)and air-conditioning(AC group),*** results demonstrated that the thermal sensation vote(TSV)in warm environments did not differ between AC and nV subjects in ***,the TSV of AC subjects were much lower than that of nV subjects in the same standard effective temperature and skin temperature in a cold environment in ***,the participants who spent most of their time in AC space in winter showed a low level of thermal adaptation with a narrower acceptable skin temperature range of 32.6-33.5℃.Thus,this study presents the basic information regarding the seasonal effects on human thermal adaptation due to different long-term indoor thermal histories.

关键词： Skin temperature Thermal experience Thermal comfort Cold acclimation Hot summer and cold winter

Simultaneous measurement of temperature and liquid refractive index based on fiber open Fabry-Pérot cavity and Bragg grating

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Optoelectronics Letters 2024年第8期20卷 477-482页

作者： liu Qinpeng WAnG Dany.ng LI Xingrui GAO hong yU Dakuang College of Science Xi'an Shiyou UniversityXi'an 710065China

A temperature and refractive index sensor based on fiber Bragg grating(FBG)end surface cascade open Fabry-Pérot(FP)cavity has been designed and demonstrated *** open FP cavity has been fabricated on the end face of an FBG by dislocation fusion in this work,the open FP cavity could be used for refractive index sensing,and the temperature is measured by the *** working principle of the sensor and the method of improving the sensitivity are analyzed by theoretical *** refractive index sensitivity of the sensor is 1108.4 nm/RIU,while the maximum fluctuation of the sensor stability experiment detection is 0.005 *** results show that it has satisfactory *** sensor is a compact all-fiber structure,so it has potential applications in the field of temperature refractive index sensing,such as biomedical and capacitor electrolyte detection.

关键词： fiber refractive cavity

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