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Experimental and numerical study on ignition and combustion characteristics of boron-magnesium composite powders

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Particuology 2024年第1期84卷 12-29页

作者： Shuyuan Liu Luyang Han Hongmei Liu Yingkai song linlin Liu songqi Hu Science and Technology on Combustion Internal Flow and Thermo-Structure LaboratoryNorthwestern Polytechnical UniversityXi'an710072China School of Mechanical Engineering and Rail Transit Changzhou UniversityChangzhou213164China Shanghai Institute of Space Propulsion Shanghai201112China Shanghai Engineering Research Center of Space Engine Shanghai201112China

A high-pressure laser ignition and combustion system with adjustable oxidizer gas atmosphere is established to investigate the ignition and combustion characteristics of boron-magnesium(BM)com-posite powders.An ignition and combustion model of BM powders is established and validated in the present study.The results show that increasing water content,O_(2) content and Mg content all result in shorter ignition delay time of BM powders,among which the effect of water content is the most obvious.However,ignition delay time increases as pressure increases.The combustion time decreases with increasing Mg content and ambient pressure but increases with water content.With the increase of O_(2) content,combustion time of BM powders first increases and then decreases,which means a critical O_(2) content exists above which combustion time decreases.The results show that there exists a trade-off between ignition and combustion performance of BM composite powders.

关键词： Boron magnesium powder Laser ignition Ignition and combustion model Reaction mechanism Numerical model

Palynological assemblages and paleoenvironmental evolution in the Gyirong Basin since Middle Miocene

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Epidural hydroxyethyl starch ameliorating postdural puncture headache after accidental dural puncture

ACTA PETROLOGICA SINICA 2024年第5期40卷 1418-1428页

作者： Liu Jia song Ai Zhang XinWen Gao Yi Chen linlin Liu Binxu Su Tao Chengdu Univ Technol Inst Sedimentary Geol MNR Key Lab Deep Time Geog & Environm Reconstruct Chengdu 610059 Peoples R China Chinese Acad Sci CAS Key Lab Trop Forest Ecol Xishuangbanna Trop Bot Garden Mengla 666303 Peoples R China Yunnan Univ Sch Earth Sci Kunming 650500 Yunnan Peoples R China Univ Bristol Sch Geog Sci Bristol BS8 1QU Avon England

The formation and evolution of the Himalaya orogeny, resulted from the collision between the Indian and Eurasian plates, has long captivated researchers in earth and life sciences. Late Cenozoic fluvio.lacustrine sedimentary basins, distributed along the Southern Tibet Detachment System on the northern slope of the Himalaya, have documented the evolution of the orogeny and paleoenvironmental changes. This study presents palynological analysis on the Danzengzhukang Formation, Woma Formation and Gongba Formation in the Gyirong Basin in the central Himalaya, to explore the sedimentary stratigraphy of the basin and the processes of Himalaya uplift and environmental effects. Based on palynological analysis, the deposition age of the Danzengzhukang Formation is revised to the Middle Miocene. Palynological assemblages reveal that since Middle Miocene, vegetation in the Gyirong Basin has transitioned from a mixed coniferous and broad.leaved forest to sparse woodlands and grasslands in Late Miocene. Subsequently, during the late Late Miocene and Pliocene, it evolved into alpine meadows, eventually forming the present.day alpine shrub and meadow vegetation since the Early Pleistocene. Paleoelevation analysis results indicate that the elevation of the Gyirong Basin has remained relatively similar to the present elevation since Middle Miocene, with no significant uplift during the deposition of the Danzengzhukang Formation and Woma Formation

关键词： ENVIRONMENTAL-CHANGES TIBETAN PLATEAU UPLIFT MONSOON ORIGIN AGE

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Chinese Medical Journal 2023年第1期136卷 88-95页

作者： Yin Zhou Zhiyu Geng linlin song Dongxin Wang Department of Anesthesiology Peking University First HospitalBeijing 100034 China

Background:No convincing modalities have been shown to completely prevent postdural puncture headache(PDPH)after accidental dural puncture(ADP)during obstetric epidural procedures.We aimed to evaluate the role of epidural administration of hydroxyethyl starch(HES)in preventing PDPH following ADP,regarding the prophylactic efficacy and side effects.Methods:Between January 2019 and February 2021,patients with a recognized ADP during epidural procedures for labor or cesarean delivery were retrospectively reviewed to evaluate the prophylactic strategies for the development of PDPH at a single tertiary hospital.The development of PDPH,severity and duration of headache,adverse events associated with prophylactic strategies,and hospital length of stay postpartum were reported.Results:A total of 105 patients experiencing ADP received a re-sited epidural catheter.For PDPH prophylaxis,46 patients solely received epidural analgesia,25 patients were administered epidural HES on epidural analgesia,and 34 patients received two doses of epidural HES on and after epidural analgesia,respectively.A significant difference was observed in the incidence of PDPH across the groups(epidural analgesia alone,31[67.4%];HES-Epidural analgesia,ten[40.0%];HES-Epidural analgesia-HES,five[14.7%];P<0.001).No neurologic deficits,including paresthesias and motor deficits related to prophylactic strategies,were reported from at least 2 months to up to more than 2 years after delivery.An overall backache rate related to HES administration was 10%.The multivariable regression analysis revealed that the HES-Epidural analgesia-HES strategy was significantly associated with reduced risk of PDPH following ADP(OR=0.030,95%confidence interval:0.006-0.143;P<0.001).Conclusions:The incorporated prophylactic strategy was associated with a great decrease in the risk of PDPH following obstetric ADP.This strategy consisted of re-siting an epidural catheter with continuous epidural analgesia and two doses of epidural HES,respectively,on and after epidural analgesi

关键词： Accidental dural puncture Epidural analgesia Hydroxyethyl starch Postdural puncture headache Prophylaxis

Influence of meteorological factors on open biomass burning at a background site in Northeast China

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Journal of Environmental Sciences 2024年第4期138卷 1-9页

作者： Yulong Wang linlin Liang Wanyun Xu Chang Liu Hongbing Cheng Yusi Liu Gen Zhang Xiaobin Xu Dajiang Yu Peng Wang Qingli song Jiumeng Liu Yuan Cheng State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China State Key Laboratory of Severe Weather&Key Laboratory for Atmospheric Chemistry Chinese Academy of Meteorological SciencesBeijing 100081China Longfengshan Regional Background Station China Meteorological AdministrationHeilongjiang 150200China Heilongjiang Climate Center Heilongjiang 150030China

Biomass burning(BB)is a very important emission source that significantly adversely impacts regional air quality.BB produces a large number of primary organic aerosol(POA)and black carbon(BC).Besides,BB also provides many precursors for secondary organic aerosol(SOA)generation.In this work,the ratio of levoglucosan(LG)to organic carbon(OC)and the fire hotspots map was used to identify the open biomass burning(OBB)events,which occurred in two representative episodes,October 13 to November 30,2020,and April1 to April 30,2021.The ratio of organic aerosol(OA)to reconstructed PM_(2.5)concentration(PM_(2.5)^(*))increased with the increase of LG/OC.When LG/OC ratio is higher than 0.03,the highest OA/PM_(2.5)^(*)ratio can reach 80%,which means the contribution of OBB to OA is crucial.According to the ratio of LG to K^(+),LG to mannosan(MN)and the regional characteristics of Longfengshan,it can be determined that the crop residuals are the main fuel.The occurrence of OBB coincides with farmers’preferred choices,i.e.,burning biomass in“bright weather”.The“bright weather”refers to the meteorological conditions with high temperature,low humidity,and without rain.Meteorological factors indirectly affect regional biomass combustion pollution by influencing farmers’active choices.

关键词： Air pollution Biomass burning Meteorological factors Organic trace Agricultural fires

Structural characterization of four Rhododendron spp.chloroplast genomes and comparative analyses with other azaleas

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BIOCELL 2023年第3期47卷 657-668页

作者： XIAOJUN ZHOU MENGXUE LIU linlin song Life Science College Luoyang Normal UniversityLuoyang471934China College of Life Science and Technology Henan Institute of Science and TechnologyXinxiang453003China

Azalea is a general designation of Rhododendron in the Ericaceae family.Rhododendron not only has high ornamental value but also has application value in ecological protection,medicine,and scientific research.In this study,we used Illumina and PacBio sequencing to assemble and annotate the entire chloroplast genomes(cp genomes)of four Rhododendron species.The chloroplast genomes of R.concinnum,R.henanense subsp.lingbaoense,R.micranthum,and R.simsii were assembled into 207,236,208,015,207,233,and 206,912 bp,respectively.All chloroplast genomes contain eight rRNA genes,with either 88 or 89 protein-coding genes.The four cp genomes were compared and analyzed by bioinformatics,and the phylogenetic analysis based on chloroplast genomes of 26 species of Ericaceae,Actinidiaceae,and Primulaceae under Ericales was conducted.A comparison of the linear structure of cp genomes of four Rhododendron showed that there were substantial sequence similarities in coding regions,but high differences in non-coding regions.A phylogenetic analysis,based on chloroplast whole genome sequences,showed that all Rhododendron species are in the clade Ericaceae.This study provides valuable genetic information for the study of population genetics and evolutionary relationships in Rhododendron and other azalea species.

关键词： Rhododendron Comparative analysis Repeat sequences Phylogeny

Few-layered hexagonal boron nitride nanosheets stabilized Pt NPs for oxidation promoted adsorptive desulfurization of fuel oil

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Green Energy & Environment 2024年第3期9卷 495-506页

作者： Peiwen Wu Xin song linlin Chen Lianwen He Yingcheng Wu Duanjian Tao Jing He Chang Deng Linjie Lu Yanhong Chao Mingqing Hua Wenshuai Zhu School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang212013China College of Chemical Engineering and Environment State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum-BeijingBeijing102249China College of Chemistry and Chemical Engineering Jiangxi Normal UniversityNanchang330022China College of Science State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum-BeijingBeijing102249China

A few-layered hexagonal boron nitride nanosheets stabilized platinum nanoparticles(Pt/h-BNNS)is engineered for oxidation-promoted adsorptive desulfurization(OPADS)of fuel oil.It was found that the few-layered structure and the defective sites of h-BNNS not only are beneficial to the stabilization of Pt NPs but also favor the adsorption of aromatic sulfides.By employing Pt/h-BNNS with a Pt loading amount of 1.19 wt%as the active adsorbent and air as an oxidant,a 98.0%sulfur removal over dibenzothiophene(DBT)is achieved along with a total conversion of the DBT to the corresponding sulfones(DBTO_(2)).Detailed experiments show that the excellent desulfurization activity originates from the few-layered structure of h-BNNS and the high catalytic activity of Pt NPs.In addition,the OPADS system with Pt/h-BNNS as the active adsorbent shows remarkable stability in desulfurization performance with the existence of different interferents such as olefin,and aromatic hydrocarbons.Besides,the Pt/h-BNNS can be recycled 12 times without a significant decrease in desulfurization performance.Also,a process flow diagram is proposed for deep desulfurization of fuel oil and recovery of high value-added products,which would promote the industrial application of such OPADS strategy.

关键词： Desulfurization Adsorption Catalytic oxidation Active adsorbent Dibenzothiophene

Exposing vertebral artery from lateral to medial under the guide of peri-vertebral artery fat pad in far lateral approach

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Chinese Medical Journal 2022年第4期135卷 468-470页

作者： Jiuhong Li linlin song Zhigang Lan Wenke Liu Yuekang Zhang Xuhui Hui Jianguo Xu Xuesong Liu Department of Neurosurgery West China HospitalSichuan UniversityChengduSichuan 610041China Department of Ultrasound West China HospitalSichuan UniversityChengduSichuan 610041China

Far lateral approach(FLA),together with its modified approaches,is a fundamental surgical approach for surgical resection of lesions located at the ventral or ventrolateral side of the foramen magnum.[1,2,3,4,5]The key procedure in FLA is exposing the vertebral artery(VA)especially the V3 segment.[1,5,6]When performing an FLA,most neurosurgeons choose to expose the suboccipital triangle(formed by the rectus capitis posterior major,the superior oblique,and the inferior oblique)as a key anatomical landmark initially and then expose the V3 segment.[1,2,5,6,7]However,on the one hand,this muscular anatomical landmarks-suboccipital triangle varies in depth,morphology,and location in different patients,which increases the risk of VA injury during surgery.[3]On the other hand,this procedure could lead to exposing difficulty due to the obstruction of overlying layers of muscles and the distribution of blood vessels,which could prolong the time for craniotomy fairly.The course of VA could vary,such as looping backward and bulge posteriorly between the lips of the suboccipital triangle,where it could be damaged if one expects it to be found in the depth of the suboccipital triangle.[3]Thus,neurosurgeons have the potential for VA injury and a rather prolonged time to successfully expose VA.

关键词： vertebral medial triangle

Infection with SARS-CoV-2 can cause pancreatic impairment

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Signal Transduction and Targeted Therapy 2024年第5期9卷 2143-2160页

作者： Wei Deng linlin Bao Zhiqi song Ling Zhang Pin Yu Yanfeng Xu Jue Wang Wenjie Zhao Xiuqin Zhang Yunlin Han Yanhong Li Jiangning Liu Qi Lv Xujian Liang Fengdi Li Feifei Qi Ran Deng Siyuan Wang Yibai Xiong Ruiping Xiao Hongyang Wang Chuan Qin NHC Key Laboratory of Comparative Medicine Beijing Key Laboratory for Animal Models of Emerging and Remerging Infectious DiseasesInstitute of Laboratory Animal ScienceChinese Academy of Medical Sciences and Comparative Medicine CenterPeking Union Medical CollegeBeijing 100021China Institute of Molecular Medicine College of Future TechnologyPeking UniversityBeijing 100871China Beijing Key Laboratory of Cardiometabolic Molecular Medicine Peking UniversityBeijing 100871China State Key Laboratory of Biomembrane and Membrane Biotechnology Peking-Tsinghua Center for Life SciencesBeijing 100871China Chinese Academy of Engineering Eastern Hepatobiliary Surgery Hospital225 Changhai RoadYangpu DistrictShanghai 200438China International Co-operation Laboratory on Signal Transduction Eastern Hepatobiliary Surgery InstituteSecond Military Medical UniversityShanghai 200438PR China National Laboratory for Oncogenes and Related Genes Cancer Institute of Shanghai Jiao Tong UniversityShanghai 200441PR China Changping National laboratory(CPNL) Beijing 102206China State Key Laboratory of Respiratory Health and Multimorbidity National Health Commission of the People’s Republic of ChinaBeijingPR China

Evidence suggests associations between COVID-19 patients or vaccines and glycometabolic dysfunction and an even higher risk of the occurrence of diabetes.Herein,we retrospectively analyzed pancreatic lesions in autopsy tissues from 67 SARS-CoV-2 infected non-human primates(NHPs)models and 121 vaccinated and infected NHPs from 2020 to 2023 and COVID-19 patients.Multi-label immunofluorescence revealed direct infection of both exocrine and endocrine pancreatic cells by the virus in NHPs and humans.Minor and limited phenotypic and histopathological changes were observed in adult models.Systemic proteomics and metabolomics results indicated metabolic disorders,mainly enriched in insulin resistance pathways,in infected adult NHPs,along with elevated fasting C-peptide and C-peptide/glucose ratio levels.Furthermore,in elder COVID-19 NHPs,SARS-CoV-2 infection causes loss of beta(β)cells and lower expressed-insulin in situ characterized by islet amyloidosis and necrosis,activation ofα-SMA and aggravated fibrosis consisting of lower collagen in serum,an increase of pancreatic inflammation and stress markers,ICAM-1 and G3BP1,along with more severe glycometabolic dysfunction.In contrast,vaccination maintained glucose homeostasis by activating insulin receptorαand insulin receptorβ.Overall,the cumulative risk of diabetes post-COVID-19 is closely tied to age,suggesting more attention should be paid to blood sugar management in elderly COVID-19 patients.

关键词： infected elevated homeostasis

Graphene-like h-BN supported polyhedral NiS_(2)/NiS nanocrystals with excellent photocatalytic performance for removing rhodamine B and Cr(Ⅵ)

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Frontiers of Chemical Science and Engineering 2021年第6期15卷 1537-1549页

作者： Wei Wang linlin song Huoli Zhang Guanghui Zhang Jianliang Cao College of Chemistry and Chemical Engineering Henan Key Laboratory of Coal Green ConversionHenan Polytechnic UniversityJiaozuo454000China State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization Henan Polytechnic UniversityJiaozuo454000China

Human health is deteriorating due to the effluent containing heavy metal ions and organic dyes.Hence,photoreduction of Cr(Ⅵ)to Cr(Ⅲ)and degradation of rhodamine B(RhB)using a novel photocatalyst is particularly important.In this work,h-BN/NiS_(2)/NiS composites were prepared via a simple solvothermal method and a double Z-scheme heterojunction was constructed for efficiently removing RhB and Cr(Ⅵ).The 7 wt-%h-BN/NiS_(2)/NiS composites were characterized via a larger specific surface area(15.12 m^(2)·g^(−1)),stronger light absorption capacity,excellent chemical stability,and high yield of electrons and holes.The experimental result indicated that the photoreduction efficiency of the 7 wt-%h-BN/NiS_(2)/NiS photocatalyst achieved 98.5%for Cr(Ⅵ)after 120 min,which was about 3 times higher than that of NiS_(2)/NiS(34%).However,the removal rate of RhB by the 7 wt-%h-BN/NiS_(2)/NiS photocatalyst reached 80%.This is due to the double Z-scheme heterojunction formed between NiS_(2)/NiS and h-BN,which improved the charge separation efficiency and transmission efficiency.Besides,the influence of diverse photogenerated electron and hole scavengers upon the photoreduction of Cr(Ⅵ)was studied,the results indicated that graphene-like h-BN promoted transportation of photoinduced charges on the surface of the h-BN/NiS_(2)/NiS photocatalyst via the interfacial effects.

关键词： graphene-like h-BN h-BN/NiS_(2)/NiS composites photocatalysis Cr(Ⅵ)reduction degradation of RhB