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Changes in microstructure and properties of weld heat-affected zone of high-strength low-alloy steel

Journal of Iron and Steel Research International 2024年第8期31卷 2041-2052页

作者： Shu-jun Jia Qi-lin Ma Yu Hou ba li He-song Zhang Qing-you liu Central Iron and Steel Research Institute Co. Ltd.Beijing 100081China Collaborative Innovation Center for Steel Commonality University of Science and Technology BeijingBeijing 100083China Construction Project Management Branch of China National Petroleum Pipeline Network Group Co. Ltd.Langfang 065000HebeiChina

The evolution of the microstructure and toughness of APl5l X80 pipeline steel after thermal welding simulation was investigated by X-ray diffraction,electron backscatter diffraction,and transmission electron *** results indicated that primary heat-affected zones can be divided into weld,coarse-grained,fine-grained,intercritical,and sub-critical *** microstructure of the weld zone is mainly composed of bainitic ferrite and a small amount of granular bainite;however,the original austenite grains are distributed in the columnar *** structure of the coarse-grained zone is similar to that of the weld zone,but the original austenite grains are *** contrast,the microstructure in the fine-grained zone is dominated by fine granular bainite,and the effective grain size is only 8.15μm,thus providing the highest toughness in the entire heat-affected *** intercritical and subcritical zones were brittle valley regions,and the microstructure was dominated by granular ***,the martensite-austenite(M/A)constituents are present in island chains along the grain boundaries,and the coarse size of the M/A constituents seriously reduces the *** results of the crack propagation analyzes revealed that high-angle grain boundaries can significantly slow down crack growth and change the crack direction,thereby increasing the material *** impact toughness of the low-temperature tempering zone was equivalent to that of the columnar grain zone,and the impact toughness was between those of the critical and fine-grained zones.

关键词： Welding thermal simulation Impact toughness Crack propagation Martensite-austenite constituent High-strength low-alloy steel weld Heat-affected zone

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Carbon dots-derived three-dimensional-ordered macroporous host with high penetrability and catalytic activity for lSBs under lean electrolyte

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Rare Metals 2024年第6期43卷 2560-2573页

作者： Jiao-Zi Duan Hua-Yu Pei Quan Yang Xue li Xin ba Xue Yong Jun-ling Guo Si-Yu lu Green Catalysis Center College of ChemistryZhengzhou UniversityZhengzhou 450001China Country State Center for International Cooperation On Designer low-Carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Hubei Institute of Quality Supervision Inspection Wuhan 430061China Department of Chemistry University of SheffieldSheffeld S37HFUK

The practical energy density of lithium-sulfur batteries(lSBs)is seriously limited by the high electrolyte-to-sulfur ratios(E/S).The E/S can be reduced by employing hosts with easy-to-infiltrate structure that ensures the uniform distribution of a lean electrolyte and high catalytic activity that can suppress"shuttle effect"via accelerating the slow conversion of soluble poly sulfides to insoluble *** the easy-to-infiltrate structures,the three-dimensional-ordered macroporous(3DOM)structure is easier to scale preparation and more suitable for the existing industrial ***,it is difficult to obtain the 3DOM with(1)high penetrability due to the high viscosity of frequently-used organic polymer precursors and(2)high catalytic activity due to the low confinement effect,meaning that uniformly dispersed small-sized catalytic materials are difficult to load on ***,using carbon dots(CDs)with both organic and inorganic properties as a precursor and aggregation limiting agent,a 3DOM host with high penetrability and homodispersed Ni particles of small sizes(Ni-CDs-3DOM)was *** this host:(1)CDs precursor with suitable viscosity can improve the penetrability.(2)CDs can effectively inhibit the agglomeration of Ni particles.(3)Uniformly dispersed small-size Ni particles offer high-efficiency catalytic activity toward sulfur ***,the Ni-CDs-3DOM/sulfur cathode exhibits high sulfur utilization and stable cycling performance even under high sulfur loading(5.5 mg·cm^(-2))and low E/S(6.5μl·mg^(-1)).This work indicates the usefulness of CDs in constructing hosts for lSBs with high energy density.

关键词： lithium-sulfur batteries Carbon dots Catalytic action Easy-to-infiltrate structure lean electrolyte

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Multi-aspect analysis of ureteral access sheath usage in retrograde intrarenal surgery: A RIRSearch group study

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Asian Journal of Urology 2024年第1期11卷 80-85页

作者： Oktay Özman Hacı M.Akgül Cem başataç Önder Çınar Eyüp B.Sancak Cenk M.Yazıcı Bülent Önal Haluk Akpınar Gaziosmanpasa Training and Research Hospital Urology ClinicİstanbulTurkey TekirdağNamık Kemal University School of MedicineDepartment of UrologyTekirdağTurkey Group Florence Nightingale Hospitals Department of UrologyİstanbulTurkey Zonguldak Bulent Ecevit University School of MedicineDepartment of UrologyZonguldakTurkey Çanakkale Onsekiz Mart University School of MedicineDepartment of UrologyÇanakkaleTurkey İstanbul University-Cerrahpaşa Cerrahpaşa Medical FacultyDepartment of UrologyİstanbulTurkey

Objective:To evaluate the effect of ureteral access sheath(UAS)use and calibration change on stone-free rate and complications of retrograde intrarenal surgery(RIRS).Methods:Data from 568 patients undergoing RIRS for kidney or upper ureteral stones were retrospectively ***,patients were compared after 1:1 propensity score matching,according to UAS usage during RIRS(UAS used[+]87 and UAS non-used[−]87 patients).Then all UAS+patients(n=481)were subdivided according to UAS calibration:9.5-11.5 Fr,10-12 Fr,11-13 Fr,and 13-15 *** outcomes of the study were the success and complications of ***:Stone-free rate of UAS+patients(86.2%)was significantly higher than UAS−patients(70.1%)after propensity score matching(p=0.01).Stone-free rate increased with higher caliber UAS(9.5-11.5 Fr:66.7%;10-12 Fr:87.0%;11-13 Fr:90.6%;13-15 Fr:100%;plications of UAS+patients(11.5%)were significantly lower than UAS−patients(27.6%)(p=0.01).Complications(8.7%)with 9.5-11.5 Fr UAS was lower than thicker UAS(17.2%)but was not statistically significant(p=0.09).UAS usage was an independent factor predicting stone-free status or peri-and post-operative complications(odds ratio[OR]3.654,95%confidence interval[CI]1.314-10.162;OR 4.443,95%CI 1.350-14.552;OR 4.107,95%CI 1.366-12.344,respectively).Conclusion:Use of UAS in RIRS may increase stone-free rates,which also increase with higher caliber *** usage may reduce complications;however,complications seemingly increase with higher UAS calibration.

关键词： Stone Retrograde intrarenal surgery Ureteral access sheath Urolithiasis Kidney

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Verteporfin fluorescence in antineoplastic-treated pancreatic cancer cells found concentrated in mitochondria

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World Journal of Gastrointestinal Oncology 2024年第3期16卷 968-978页

作者： Ying-Qiao Zhang Qing-Hao liu lu liu Peng-Yu Guo Run-Ze Wang Zhi-Chang ba Department of Radiology Harbin Medical University Cancer HospitalHarbin 150010Heilongjiang ProvinceChina Department of Digestive Internal Medicine Harbin Medical University Cancer HospitalHarbin 150010Heilongjiang ProvinceChina

baCKGROUND Traditional treatments for pancreatic cancer(PC)are *** therapy(PDT)is non-invasive,and proven safe to kill cancer cells,including ***,the mitochondrial concentration of the photosensitizer,such as verteporfin,is *** To investigate the distribution of fluorescence of verteporfin in PC cells treated with antitumor drugs,*** Workable survival rates of PC cells(AsPC-1,BxPC-3)were determined with chemotherapy[doxorubicin(DOX)and gemcitabine(GEM)]and non-chemotherapy[sirolimus(SRl)and cetuximab(CTX)]drugs in vitro,with or without verteporfin,as measured via MTT,flow cytometry,and laser confocal *** cell proliferation was associated with GEM that was more enduring compared with *** laser microscopy allowed observation of GEM-and verteporfin-treated PC cells co-stained with 4’,6-diamidino-2-phenylindole and MitoTracker Green to differentiate living and dead cells and subcellular localization of verteporfin,*** Cell survival significantly dropped upon exposure to either chemotherapy drug,but not to SRl or *** cell lines responded similarly to *** intensity of fluorescence was associated with the concentration of *** experiments using GEM showed that survival rates of the PC cells treated with 10μmol/l verteporfin(but not less)were significantly lower relative to nil *** and dead stained cells treated with GEM were *** GEM treatment,verteporfin was observed primarily in the *** Verteporfin was observed in living *** GEM-treated human PC cells,verteporfin was particularly prevalent in the *** study supports further study of PDT for the treatment of PC after neoadjuvant chemotherapy.

关键词： Photodynamic therapy Pancreatic cancer Verteporfin Mitochondria Chemotherapy Gemcitabine

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“一带一路”沿线国家数字经济合作的基础、挑战与路径

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河南社会科学 2024年第1期32卷 43-51页

作者：巴殿君吕博尧吉林大学东北亚研究中心吉林长春130012

数字经济是重塑全球竞争格局的关键力量,给共建“一带一路”国家的合作提供新的机遇。中国在“一带一路”倡议下积极推动与多个共建国家的数字合作,加强了数字经济领域的协调,使共建国家数字综合实力不断提高。随着新兴科技的快速发展,... 详细信息

数字经济是重塑全球竞争格局的关键力量,给共建“一带一路”国家的合作提供新的机遇。中国在“一带一路”倡议下积极推动与多个共建国家的数字合作,加强了数字经济领域的协调,使共建国家数字综合实力不断提高。随着新兴科技的快速发展,推动产业数字化转型,共建国家对数字经济的政策支持不断完善,数字基础设施得到加强,数字环境持续改善,我国数字经济蓬勃发展,为进一步的合作奠定了坚实基础。然而,共建国家在数字经济合作方面仍存在数字经济发展不平衡、网络安全威胁、数字规则机制建设滞后等问题。为应对这些挑战,需因地制宜地推动数字经济协调发展,构建全面的数字安全保障体系,妥善处理中美关系和数字领域的竞争,多层次地构建数字治理体系,加强话语权建设并构建战略互信,加大金融支持人才培育、鼓励创新力度,实现共建“一带一路”国家数字经济的共同发展和互利共赢。

关键词： “一带一路” 数字经济 “数字丝绸之路” 国际合作

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Woody plant taxonomic,functional,and phylogenetic diversity decrease along elevational gradients in Andean tropical montane forests:Environmental filtering and arrival of temperate taxa

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Plant Diversity 2024年第4期46卷 491-501页

作者： Guillermo bañares-de-Dios Manuel J.Macía Gabriel Arellano Íñigo Granzow-de la Cerda Julia Vega-álvarez Itziar Arnelas Carlos I.Espinosa Norma Salinas luis Cayuela Departamento de Biología y Geología Física y Química InorgánicaUniversidad Rey Juan CarlosCalle Tulipán s/nMóstolesMadridES-28933Spain Departamento de Biología Área de BotánicaUniversidad Autónoma de MadridCalle Darwin 2MadridES-28049Spain Centro de Investigación en Biodiversidad y Cambio Global(CIBC-UAM) Universidad Autónoma de MadridCalle Darwin 2MadridES-28049Spain Ecology and Evolutionary Biology University of MichiganAnn ArborMI 48109USA Oikobit llC ***AlbuquerqueNM87120USA Real Jardín Botánico–CSIC Plaza Murillo 2MadridES-28014Spain Departamento de Biología Animal EcologíaParasitologíaEdafología y Química AgrícolaUniversidad de SalamancaCalle Donantes de Sangre s/nSalamancaES-37007Spain Departamento de Biodiversidad Ecología y EvoluciónUniversidad Complutense de MadridCalle JoséAntonio Nováis 12Ciudad UniversitariaES-28040Spain Departamento de Ciencias Biológicas y Agropecuarias Universidad Técnica Particular de LojaA.P.11-01-608 LojaEcuador Sección Química Pontificia Universidad Católica del PerúA.P.Lima 32LimaPeru ECI School of Geography and EnvironmentUniversity of OxfordOX13QYOxfordshireUnited Kingdom Instituto de Investigación en Cambio Global(IICG-URJC) Universidad Rey Juan CarlosCalle Tulipán s/nMóstolesMadridES-28933Spain

Mountains are paramount for exploring biodiversity patterns due to the mosaic of topographies and climates encompassed over short *** research has traditionally focused on taxonomic diversity when investigating changes along elevational gradients,but other facets should be *** first time,we simultaneously assessed elevational trends in taxonomic,functional,and phylogenetic diversity of woody plants in Andean tropical montane forests and explored their underlying ecological and evolutionary *** investigation covered four transects(traversing ca.2200 m a.s.l.) encompassing 114 plots of 0.1 ha across a broad latitudinal range(ca.10°).Using Hill numbers to quantify abundance-based diversity among 37,869 individuals we observed a consistent decrease in taxonomic,functional,and phylogenetic diversity as elevation increased,although the decrease was less pronounced for higher Hill *** exception was a slight increase in phylogenetic diversity when dominant species were *** decrease in taxonomic and functional diversity might be attributed to an environmental filtering process towards highlands,where the increasingly harsher conditions exclude species and functional ***,the differences in steepness decrease between Hill orders suggest that rare species disproportionately contribute to functional *** phylogenetic diversity the shifting elevational trend between Hill orders indicates a greater than previously considered influence in central Andean highlands of tropical lowlands originated species with strong niche conservatism relative to distantly related temperate *** could be explained by a decreasing presence and abundance of temperate,extratropical taxa towards the central Andes relative to northern or southern Andes,where they are more prevalent.

关键词： Altitudinal gradients Andes Environmentalﬁltering Out of the Tropical lowlands Functional rarity Tropical Niche Conservatism

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Study on the Impact of Post-Mastectomy Radiotherapy on Immediate Breast Reconstruction and Complications: A Meta-Analysis

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Journal of Clinical and Nursing Research 2024年第6期8卷 64-76页

作者： Wen li Manman Sun lihao Zheng Yibo Jiang Nan ba Department of Radiation Oncology Fifth Affiliated Hospital of Zhengzhou UniversityZhengzhou CityHenan Province 450000China

background and objective:Immediate breast reconstruction not only reduces the number of surgeries for patients after mastectomy but also decreases psychological and physical trauma,making it increasingly ***,there is currently no consensus on the integration of post-mastectomy radiotherapy(PMRT)with reconstruction *** review evaluates the impact of PMRT on complications following immediate breast reconstruction,providing guidance for clinical treatment ***:PubMed,Web of Science,Embase,and other databases were searched for studies published in the past 15 years on outcomes of implant-based breast reconstruction in the context of radiotherapy to identify articles for *** 5.4 software was used to analyze the risks of seroma,infection,wound dehiscence,flap necrosis,implant exposure,capsule contracture,and reconstruction ***:A total of 1l relevant studies were included,comprising 6323 cases of immediate breast *** was found that breasts receiving postoperative irradiation had a significantly increased risk of complications,with statistically significant differences in seroma(P=0.004),infection(Plant exposure(Ple contracture(Plure(Plly significant difference in flap necrosis(P=0.88).Conclusion:The results indicate that postoperative radiotherapy significantly increases the risk of complications for patients undergoing immediate implant-based *** measures may be taken in advance with the assistance of healthcare providers if necessary.

关键词： Breast cancer Immediate breast reconstruction Radiotherapy Post-mastectomy Complications

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Interest of Cardiac Rehabilitation in Patients with Heart Disease in a Cardiology Department in Senegal

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World Journal of Cardiovascular Diseases 2024年第4期14卷 217-227页

作者： Awa ba-Diop Abdou Khadir Sow Rim Mohamed Khaled Mor Diaw Mame Saloum Coly Fulgence Abdou Faye Amadou Ndiadé bamba Gaye Abdoulaye ba Abdoulaye Samb laboratory of Physiology and Functional Explorations Department of Medicine Alioune Diop University of Bambey Bambey Senegal IRl3189 Environment Health Societies CNRS-UCAD Dakar Senegal The African Research Network Noncommunicable Diseases Dakar Senegal laboratory of Physiology and Functional Explorations FMPOS UCAD Dakar Senegal laboratory of Physiology and Functional Explorations UFR Sant&#233 UAS of Thi&#232s Thi&#232s Senegal INSERM U970 Team 4 Paris France

Cardiac rehabilitation helps improve the prognosis and quality of life for patients with heart disease. To show its interest in the African context, in the management of heart disease, a prospective study was carried out. Its objective was to evaluate the effects of physical rehabilitation on cardiac function. Methods: Patients were evaluated at the beginning and at the end of cardiovascular rehabilitation by cardiovascular, biological, and echocardiographic parameters including the size of the heart chambers, the kinetics of the walls, and the systolic function of the ventricles. Results: The study involved 12 patients, 67% of whom were men. After cardiac rehabilitation, the mean hemodynamic constants had not been significantly modified. However, a significant decrease in Total-Cholesterol, lDl-Cholesterol and triglyceride levels was noted. Mean fasting blood sugar decreased from 1.25 ± 0.48 g/l to 0.92 ± 0.18 g/l and glycated hemoglobin from 7.72% ± 0.01% to 6.45% ± 0.008%. The echocardiographic parameters studied showed an improvement in the dilation of the heart chambers in 8.33% of the patients, the normalization of the ejection fraction of the left ventricle in 16% patients, the improvement of the kinetic disorders in 16% of patients and recovery of right ventricular systolic function in all patients. Conclusion: Cardiac rehabilitation as a secondary preventive measure for cardiovascular disease has contributed significantly to improving the clinico-biological parameters of the disease.

关键词： Cardiac Rehabilitation Heart Disease Cardiovascular Disease

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基于抚育整枝目标的毛白杨枝条冲击切割性能适应性分析

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北京林业大学学报 2024年第4期46卷 158-166页

作者：吕坤班以琛坝仕宏刘洋文剑北京林业大学工学院林业装备与自动化国家林业和草原局重点实验室北京100083

【目的】为了提高毛白杨枝条冲击切割效率并改善切割效果,通过研究枝条内部因素对切割性能的影响,对毛白杨枝条的冲击切割性能进行适应性分析。【方法】以我国华北地区林场广泛种植的速生林品种毛白杨的枝条为研究对象,使用自制的枝条... 详细信息

【目的】为了提高毛白杨枝条冲击切割效率并改善切割效果,通过研究枝条内部因素对切割性能的影响,对毛白杨枝条的冲击切割性能进行适应性分析。【方法】以我国华北地区林场广泛种植的速生林品种毛白杨的枝条为研究对象,使用自制的枝条切割平台进行枝条切割试验。在单因素试验的基础上采用Box-Benhnken中心组合试验方法,通过试验和理论研究枝条直径、含水率和分枝角度3个内部因素对峰值切割力和断裂效果的影响规律。【结果】(1)建立了毛白杨枝条冲击切割性能的切割机理模型;(2)通过对模型进行优化分析,得到最优参数组合为枝条直径14.7 mm、含水率14.0%、分枝角度90°,该组合下的峰值切割力为370.48 N,断裂效果评分为4.6分,峰值切割力和断裂效果分数的预测值与实测值的相对偏差均小于5%;(3)峰值切割力与枝条直径呈线性增长关系,随枝条含水率的增大呈先增大后减小的趋势,随着分枝角度的增大而小幅增大。【结论】选择树龄为7年时进行修枝作业,作业的季节选择秋冬季,可以获得较优的修枝质量,该研究可为速生林修枝装备的研发与林木抚育方式的优化结合提供数据支撑。

关键词：机械化抚育整枝冲击切割毛白杨枝条切割适应性切割质量参数

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中老年人血液常见氨基酸水平与轻度脑白质疏松症的相关性

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首都医科大学学报 2024年第1期45卷 163-168页

作者：邢怡文巴晓红锦州医科大学附属第一医院神经内科辽宁锦州121000

目的探讨中老年人血液常见氨基酸水平与早期轻度脑白质疏松症(leukoaraiosis,lA)的关系及其对轻度lA的筛查诊断价值。方法本研究纳入2020年8月至2021年11月因头晕或头痛等主诉于锦州医科大学附属第一医院神经内科住院的患者,根据头颅磁... 详细信息

目的探讨中老年人血液常见氨基酸水平与早期轻度脑白质疏松症(leukoaraiosis,lA)的关系及其对轻度lA的筛查诊断价值。方法本研究纳入2020年8月至2021年11月因头晕或头痛等主诉于锦州医科大学附属第一医院神经内科住院的患者,根据头颅磁共振检查结果入组21例非lA患者和31例轻度lA患者,使用串联质谱法采集患者23种血液氨基酸代谢物水平,比较两组患者血液氨基酸水平差异,使用logistic回归分析模型和受试者工作特征(receiver operating characteristic,ROC)曲线研究轻度lA的独立危险因素以及血液氨基酸水平对轻度lA的筛查诊断价值。结果年龄、冠状动脉粥样硬化性心脏病史、酪氨酸和缬氨酸水平在两组间差异具有统计学意义(Plogistic回归显示,年龄(OR=1.232,95%CI:1.068~1.420)和缬氨酸水平(OR=1.059,95%CI:1.009~1.111)是轻度lA的独立危险因素,年龄增长和缬氨酸水平升高,发生轻度lA的风险增加。ROC曲线分析结果表明,年龄和缬氨酸筛查轻度lA的最佳截断值分别是58.5岁和96.305μmol/l,ROC曲线下面积分别为0.710(95%CI:0.565~0.856,PlA具有相关性,年龄增长和缬氨酸水平升高是轻度lA的独立危险因素,两者在筛查轻度lA方面具有一定的临床价值。

关键词：脑白质疏松症氨基酸缬氨酸

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