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Methyl Groups Pendant on Triphenylmethane Toward Modulating Thermal Stability and Dielectric Properties of the Crosslinkable Fluorinated Polyimide Films with High Transparency

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Chinese Journal of Polymer Science 2025年第2期43卷 316-327页

作者： Wen Yang liang Yuan Kai Gong Ruo-Han Zhang lan Lei Hui Li School of Chemistry and Chemical Engineering Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering MaterialsUniversity of JinanJinan250022China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin300350China

It is urgent to develop high-performance polyimide(PI)films that simultaneously exhibit high transparency,exceptional thermal stability,mechanical robustness,and low dielectric to fulfil the requirements of flexible display ***,a series of fluorinated polyimide films(FPIs)were fabricated by the condensation of 5,5′-(perfluoropropane-2,2-diyl)bis(isobenzofuran-1,3-dione)(6FDA)and the fluorinated triphenylmethane diamine monomer(EDA,MEDA and DMEDA)with heat-crosslinkable tetrafluorostyrene side groups,which was incorporated by different numbers of methyl groups pendant in the ortho position of amino ***,the FPI films underwent heating to produce crosslinking FPIs(C-FPIs)through the self-crosslinking of double bonds in the *** transparency,solvent resistance,thermal stability,mechanical robustness and dielectric properties of FPI and C-FPI films can be tuned by the number of methyl groups and crosslinking,which were deeply investigated by virtue of molecular dynamics(MD)simulations and density functional theory(DFT).As a result,all the films exhibited exceptional optically colorless and transparent,with transmittance in the visible region of 450-700 nm exceeding 79.9%,and the cut-off wavelengths(λ_(off))were nearly 350 *** thermal decomposition temperatures at 5% weight loss(T_(d5%))for all samples exceeded 504℃.These films exhibited a wide range of tunable tensile strength(46.5-75.1 MPa).Significantly,they showed exceptional dielectric properties with the dielectric constant of 2.3-2.5 at full frequency(10^(7)-20 Hz).This study not only highlights the relationship between the polymer molecular structure and properties,but offer insights for balancing optical transparency,heat resistance and low dielectric constant in PI films.

关键词： Crosslinkable fluorinated polyimide Methyl group Triphenylmethane Transparency Thermal stability Low dielectric constant

Experimental Study on Diesel Spray and Flame Asymmetry Characteristics of Dual-Orifice Nozzles for a Medium-Speed Engine

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Journal of Thermal Science 2025年第1期34卷 303-322页

作者： ju Dehao LIURui ZHENG liang DENG Jiahui ZHANG Wenzheng HUO Jinlu HUANG Li Shanghai Marine Diesel Engine Research Institute Shanghai 201108China National Key Laboratory of Marine Engine Science and Technology Shanghai 201108China Key Laboratory for Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China

The asymmetry of the multi-orifice spray will cause uneven heat load of the marine diesel engine,thereby affecting its working performance and service ***,an in-depth understanding of the spray and flame characteristics of multi-orifice nozzles will guide the optimization of the nozzle structure,needle design and diesel atomization and combustion *** this reason,four groups of dual-orifice nozzles with different hole diameters(0.1-0.55 mm)and mass flow rates covering the typical marine medium-speed diesel injections are designed and customized,and the constant volume chamber(CVC)with high temperature and pressure is used to simulate the actual in-cylinder working conditions of the diesel engine for the spray visualization *** study the asymmetry of the fuel sprays discharged from a diesel injector,the multi-orifice nozzle is simplified as a dual-orifice nozzle in this *** with X-ray Computed Tomography(CT)imaging technology,the influences of the nozzle internal structure on the spray and flame asymmetry are studied in the constructed supercritical *** is found that the asymmetry of the inlet angle and the equivalent length-diameter ratio is positively correlated with the inconsistency of the dual *** an increase in the injection pressure and nozzle diameter,the asymmetry of the dual spray becomes more pronounced,resulting in greater disparities in the ignition delay times and ignition positions of the two ***,the increase in nozzle diameter also leads to combustion instability,resulting in a flame with a serrated *** the increase of ambient temperature,the proportion of liquid phase in the jet decreases and the relative density of spray front decreases.

关键词： dual-orifice nozzle nozzle structure atomization spray flame asymmetry

Unraveling post-growth mechanisms of monolayer CsPbBr3 nanocubes:Laser-enhanced transformations and cathodoluminescence-electron microscopy correlations

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Journal of Energy Chemistry 2025年第1期100卷 146-156页

作者： Mingxing Li Xiaoge Wang Xiaofan Cao Zhiqun He Chunjun liang Mingxing Chen Jing ju Fangtian You Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Lead-halide perovskite nanoparticles(LHP NPs) are highly promising materials for next-generation displays and solid-state lighting due to their exceptional optical properties. However, their inherent instability presents a significant challenge. Recent advances have demonstrated that optoelectronic devices based on monolayer nanoparticle films exhibit both high luminescence efficiency and long-term *** research demonstrates that mobility limitations and anisotropic alignments in CsPbBr3nanocube monolayer films are key to their stabilization, hindering spontaneous growth through face-to-face fusion and resulting in the formation of connecting necks in a diagonal direction. Introducing laser irradiation confirmed this by significantly accelerating nanocubes growth, increasing mobility, and enhancing local structural ordering, leading to larger and more regularly shaped nanosheets. Fourier transform infrared spectroscopy and energy dispersive spectroscopy line-scan analyses indicated that laser irradiation did not disrupt the ligand structure. Transmission electron microscopy and correlative cathodoluminescence electron microscopy revealed the effects of post-growth and heterogeneous structures, including enhanced luminescence and inhomogeneous intensity in the nanosheets. These findings deepen the understanding of the post-growth mechanism of monolayer nanoparticles and the structure-emission correlation and highlight the unique role of laser irradiation in directing the formation of well-defined and regular nanostructures.

关键词： CsPbBr3 nanocubes Post-growth mechanism Heterogeneous structure Single-particle spectroscopy Laser irradiation

Broadband diffusion of terahertz waves by multi-bit coding metasurfaces

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Light(Science & Applications) 2015年第1期4卷 207-215页

作者： Li-Hua Gao Qiang Cheng Jing Yang Shao-Jie Ma Jie Zhao Shuo Liu Hai-Bing Chen Qiong He Wei-Xiang Jiang Hui-Feng Ma Qi-Ye Wen lan-ju liang Biao-Bing Jin Wei-Wei Liu Lei Zhou Jian-Quan Yao Pei-Heng Wu Tie-jun Cui State Key Laboratory of Millimeter Waves Department of Radio EngineeringSoutheast UniversityNanjing 210096China Cooperative Innovation Centre of Terahertz Science No.4Section 2North Jianshe RoadChengdu 610054China Institute of Modern Optics Key Laboratory of Optical Information Science and Technology(Ministry of Education)Nankai UniversityTianjin 300071China State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)Department of PhysicsFudan UniversityShanghai 200433China State Key Laboratory of Electronic Films and Integrated Devices University of Electronic Science and TechnologyChengdu 610054China Research Institute of Superconductor Electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China Institute of Lasers and Optoelectronics College of Precision Instrument and Opto-Electronics EngineeringTianjin UniversityTianjin 300072China

The terahertz region is a special region of the electromagnetic spectrum that incorporates the advantages of both microwaves and infrared light *** the past decade,metamaterials with effective medium parameters or gradient phases have been studied to control terahertz waves and realize functional ***,we present a new approach to manipulate terahertz waves by using coding metasurfaces that are composed of digital coding *** propose a general coding unit based on a Minkowski closed-loop particle that is capable of generating 1-bit coding(with two phase states of 0 and 180°),2-bit coding(with four phase states of 0,90°,180°,and 270°),and multi-bit coding elements in the terahertz frequencies by using different geometric *** show that multi-bit coding metasurfaces have strong abilities to control terahertz waves by designing-specific coding *** an application,we demonstrate a new scattering strategy of terahertz waves—broadband and wide-angle diffusion—using a 2-bit coding metasurface with a special coding design and verify it by both numerical simulations and *** presented method opens a new route to reducing the scattering of terahertz waves.

关键词： coding diffusion metasurface terahertz waves

Microvesicles derived from mesenchymal stem cells: A promising therapeutic strategy for acute respiratory distress syndrome-related pulmonary fibrosis?

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World Journal of Stem Cells 2025年第1期17卷 66-70页

作者： Zhao Zhang Xin-Yun Shan Ce liang lan Zhao Xiao-Qian Shan The First Teaching Hospital of Tianjin University of Traditional Chinese Medicine Tianjin 300381China Shandong Medical College Jinan 276000Shandong ProvinceChina Hebei Normal University of Science and Technology Qinhuangdao 066004Hebei ProvinceChina Tianjin Institute of Acupuncture and Moxibustion The First Teaching Hospital of Tianjin University of Traditional Chinese MedicineTianjin 300381China

Pulmonary fibrosis significantly contributes to the pathogenesis of acute respiratory distress syndrome(ARDS),markedly increasing patient *** the established anti-fibrotic effects of mesenchymal stem cells(MSCs),numerous challenges hinder their clinical application.A recent study demon-strated that microvesicles(MVs)from MSCs(MSC-MVs)could attenuate ARDS-related pulmonary fibrosis and enhance lung function via hepatocyte growth factor mRNA *** discovery presents a promising strategy for managing ARDS-associated pulmonary *** article initially examines the safety and efficacy of MSCs from both basic science and clinical perspectives,subsequently exploring the potential and obstacles of employing MSC-MVs as a novel therapeutic ***,it provides perspectives on future research into the application of MSC-MVs in ARDS-associated pulmonary fi-brosis.

关键词： Microvesicles derived from mesenchymal stem cells Acute respiratory distress syndrome Pulmonary fibrosis Hepatocyte growth factor Mesenchymal stromal cells

Comparison of the effect of ranibizumab in retinal vein occlusion and macular edema with different optical coherence tomographic patterns

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International Journal of Ophthalmology(English edition) 2025年第2期18卷 275-282页

作者： Yue Xu Yue-Cong Yin Ze-Yu Song Xiao-Yu Zhou Jia-ju Zhang juan liang Department of Ophthalmology the Fourth Affiliated Hospital of Soochow UniversitySuzhou 215000Jiangsu ProvinceChina

AIM:To explore the morphological and functional parameters to evaluate the effectiveness of intravitreal injections of ranibizumab(IVR)in treating macular edema(ME)secondary to retinal vein occlusion(RVO).METHODS:This retrospective study involved 65 RVO patients(65 eyes)who received IVR and were followedup for more than *** was categorized into cystoid macular edema(CME),diffuse retinal thickening(DRT),and serous retinal detachment(SRD)according to optical coherence tomography(OCT)*** comparison of best corrected visual acuity(BCVA;logMAR)and central macular thickness(CMT)among different follow-up points and those among 3 groups were performed by Kruskal-Wallis *** correlation between BCVA and baseline parameters during treatment was analyzed using Spearman correlation ***:BCVA tended to improve in all groups,with marked improvement in CME and DRT *** showed the greatest reduction after 1wk,and remained stable over the following *** patients had the worst BCVA and the highest CMT at baseline,but the differences became smaller after IVR *** in SRD group was significantly better than in CME and DRT groups 3mo after *** patients of CME and SRD groups transitioned to a normal pattern at 3mo *** patients were most likely to transform into the other morphological groups,while SRD patients showed minimal *** at baseline was identified as the most important prognostic indicator in all 3 ***,DRT patients with a longer clinical course,higher CMT and central retinal vein occlusion(CRVO)tend to exhibit worse BCVA after *** addition,CRVO patients are more likely to have worse BCVA at 2 and 3mo follow-up compared with branch retinal vein occlusion(BRVO)patients in CME *** patients with higher baseline CMT were prone to experiencing worse BCVA after ***:The effectiveness of IVR is strongly correlated with baseline BCVA in all 3 *** parameters inc

关键词： retinal vein occlusion optical coherence tomography serous retinal detachment cystoid macular edema diffuse retinal thickening

Distinct Mechanisms Governing Two Types of Extreme Hourly Rainfall Rates in the Mountain Foothills of North China During the Passage of a Typhoon Remnant Vortex from 30 july to 1 August 2023

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Advances in Atmospheric Sciences 2025年第4期42卷 761-779页

作者： Rudi XIA Yuqing RUAN Jisong SUN Xudong liang Chong WU Feng LI ju LI Jinfang YIN Xinghua BAO Mingxin LI Xiaoyu GAO State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science&TechnologyNanjing 210044China Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China Research Center for Disastrous Weather over Hengduan Mountains&Low-Latitude Plateau China Meteorological AdministrationKunming 650034China

This study investigates extreme rainfall episodes along the eastern foothills of the Taihang Mountains in North China from 30 july to 1 August *** focuses on two types of extreme hourly rainfall rates(HRRs),i.e.,the maximum regionalaverage HRR and site-observed HRR,which exhibited sequential development over southern,middle,and northern key *** rainfall extremes occurred in an environment where a high-pressure barrier over North China prevented the intrusion of cold air masses from the north while a northward-moving typhoon remnant vortex and its associated low-level jet(LLJ)transported warm and moist airflow from the *** distinct echo evolution modes and convection initiation mechanisms are identified for the two types of extreme *** maximum regional-average HRR occurred when the LLJ arrived to the east of the key regions,while the maximum site-observed HRR occurred when the warmer vortex center influenced the *** the northern key region as a representation,at the time of the maximum regional-average HRR,slantwise ascent of the airflow along a warm-frontal-like boundary released energy related to symmetrical instability,resulting in stratiform rainfall with weak convective *** transport of locally initiated convection over the eastern plain region,where the atmospheric stratification was more potentially unstable,also significantly *** the maximum site-observed HRR occurred,the terrain lifting of warm and moist southeast airflow led to intense convection over the mountain ***,the passage of the warm-core typhoon remnant vortex and interaction with Taihang Mountains determined the timing and location of extreme HRRs across the key regions.

关键词： extreme rainfall hourly rainfall rate mountain vortex mechanism

Association between autoimmune gastritis and gastric polyps:Clinical characteristics and risk factors

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World Journal of Gastrointestinal Oncology 2025年第1期17卷 73-87页

作者： Jing-Zheng Jin Xiao liang Shu-Peng Liu Rui-lan Wang Qing-Wei Zhang Yu-Feng Shen Xiao-Bo Li Division of Gastroenterology and Hepatology Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Division of Gastroenterology and Hepatology Shanghai Institute of Digestive DiseasesShanghai 200001China Division of Gastroenterology and Hepatology Renji Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200127China Division of Gastroenterology and Hepatology Sichuan Armed Police Corps HospitalLeshan 610041Sichuan ProvinceChina Division of Gastroenterology and Hepatology NHC Key Laboratory of Digestive DiseasesRenji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Department of Gastroenterology Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai Institute of Digestive DiseasesShanghai 200127China

BACKGROUND The relationship between autoimmune gastritis(AIG)and gastric polyps(GPs)is not well *** To explore the clinical characteristics and risk factors of AIG with GPs in *** This double center retrospective study included 530 patients diagnosed with AIG from july 2019 to july *** collected clinical,biochemical,serological,and demographic data were of each *** regression analyses,both multivariate and univariate,were conducted to pinpoint independent risk factors for GPs in patients with AIG *** operating characteristic curves were utilized to establish the optimal cutoff values,sensitivity,and specificity of these risk factors for predicting GPs in patients with *** Patients with GPs had a higher median age than those without GPs[61(52.25-69)years vs 58(47-66)years,P=0.006].The gastrin-17 levels were significantly elevated in patients with GPs compared with those without GPs[91.9(34.2-138.9)pmol/mL vs 60.9(12.6-98.4)pmol/mL,P<0.001].Additionally,the positive rate of parietal cell antibody(PCA)antibody was higher in these patients than in those without GPs(88.6%vs 73.6%,P<0.001).Multivariate and univariate analyses revealed that PCA positivity[odds ratio(OR)=2.003,P=0.017],pepsinogen II(OR=1.053,P=0.015),and enterochromaffin like cells hyperplasia(OR=3.116,P<0.001)were significant risk factors for GPs,while pepsinogen I was identified as a protective *** PCA positivity and enterochromaffin like cells hyperplasia are significant risk factor for the development of GPs in patients with *** gastrin-17 levels may also play a role in this *** findings suggest potential targets for further research and therapeutic intervention in managing GPs in patients with AIG.

关键词： Autoimmune gastritis Gastric polyps Neuroendocrine tumor Risk factors Nomogram

BIBR1532 inhibits proliferation and metastasis of esophageal squamous cancer cells by inducing telomere dysregulation

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World Journal of Gastrointestinal Oncology 2025年第1期17卷 214-225页

作者： Qin Wang Qing-Rong Li Lei Xu Zi-Chun Yuan Xiao Liu Mao-ju Tang Man Luo Xiao-Wu Zhong Qiang Ma Xiao-lan Guo Department of Clinical Laboratory Affiliated Hospital of North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina School of Laboratory Medicine&Translational Medicine Research Center North Sichuan Medical CollegeNanchong 637000Sichuan ProvinceChina

BACKGROUND Esophageal squamous cell carcinoma(ESCC)is a malignant tumor with high morbidity and mortality,and easy to develop resistance to chemotherapeutic *** are DNA-protein complexes located at the termini of chro-mosomes in eukaryotic cells,which are unreplaceable in maintaining the stability and integrity of ***,an RNA-dependent DNA polymerase,play vital role in telomere length maintain,targeting telomerase is a promising therapeutic strategy for ***150 and KYSE410 cells were cultured and exposed to various concentrations of *** viability was assessed at 48 hours and 72 hours to determine the IC50 *** effects of BIBR1532 on ESCC cell proliferation,migration,and cellular senescence were evaluated using the cell counting kit-8 assay,plate colony formation assay,scratch assay,transwell assay,andβ-galactosidase staining,*** blotting was performed to detect the expression of RESULTS The IC50 values for KYSE150 and KYSE410 cells after 48 hours of BIBR1532 exposure were 48.53μM and 39.59μM,*** values decreased to 37.22μM and 22.71μM,respectively,following a longer exposure of 72 ***1532 exhibited dose-dependent effects on KYSE150 and KYSE410 cells,including decreased hTERT expression,inhibition of proliferation and metastasis,and induction of cellular ***,BIBR1532 upregulated the expression of the DDR protein,γ-H2AX,and activated the ataxia telangiectasia and Rad3-related protein(ATR)/check point kinase 1(CHK-1)and ataxia-telangiectasia mutated gene(ATM)/CHK2 ***1532 downregulated the expression of telomere-binding proteins,including telomeric-repeat binding factor 1(TRF1),TRF2,protection of telomeres 1,and TIN2-interacting protein *** a nude mouse xenograft model,BIBR1532 significantly suppressed tumor growth,reduced hTERT expression,and increasedγ-H2AX protein *** and eosin staining of various organs,including the heart,liver,s

关键词： Esophageal squamous cell carcinoma BIBR1532 Human telomerase reverse transcriptase DNA damage response Telomere-binding proteins