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Rotary bending fatigue behavior of A356 –T6 aluminum alloys by vacuum pressurizing casting

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China Foundry 2015年第5期12卷 326-332页

作者： Yong-qin Liu Wan-qi Jie Zhi-ming Gao Yong-jian Zheng hai-jun luo Wen-tao Song State Key Laboratory of Solidification Processing Northwestern Polytechnical University School of Aerospace Mechanical and Manufacturing Engineering RMIT University Simulation and Modeling of Metallurgical Processes Montanuniversitaet Leoben

Vacuum pressurizing casting technique, providing better mould filling and inter-dendritic feeding, can reduce the porosity greatly in cast aluminum alloys, and improve the fatigue properties. The rotary bending fatigue properties of A356-T6 alloys prepared by vacuum pressurizing casting were investigated. The S-N curve and limit strength 90 MPa under fatigue life of 107 cycles were obtained. The analyses on the fatigue fractography and microstructure of specimens showed that the fatigue fracture mainly occurs at the positions with casting defects in the subsurface, especially at porosities regions, which attributed to the crack propagation during the fatigue fracture process. Using the empirical crack propagation law of Pairs-Erdogon, the quantitative relationship among the initial crack size, fatigue life and applied stress was established. The fatigue life decreases with an increase in initial crack size. Two constants in the Pairs-Erdogon equation of aluminum alloy A356-T6 were calculated using the experimental data.

关键词： aluminum alloys vacuum pressurizing casting rotary bending fatigue porosity crack propagation

Effect of graphene/ZnO hybrid transparent electrode on characteristics of GaN light-emitting diodes

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Chinese Physics B 2018年第11期27卷 552-558页

作者： jun-Tian Tan Shu-Fang Zhang Ming-Can Qian hai-jun luo Fang Wu Xing-Ming Long Liang Fang Da-Peng Wei Bao-Shan Hu State Key Laboratory of Mechanical Transmission Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Mater/als College of PhysicsChongqing UniversityChongqing 400044China College of Software Chongqing College of Electronic EngineeringChongqing 401331China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 400047China Chongqing Engineering Research Center of Graphene Film Manufacturing Chongqing 401331China College of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China

In order to reduce the Schottky barrier height and sheet resistance between graphene(Gr)and the p-GaN layers in GaN-based light-emitting diodes(LEDs),conductive transparent thin films with large work function are required to be inserted between Gr and p-GaN *** the present work,three kinds of transparent conductive oxide(TCO)zinc oxide(ZnO)films,Al-,Ga-,and In-doped ZnO(AZO,GZO,and IZO),are introduced as a bridge layer between Gr and p-GaN,*** influence of different combinations of Gr/ZnO hybrid transparent conducting layers(TCLs)on the optical and thermal characteristics of the GaN-LED was investigated by the finite element method through COMSOL *** is found that both the TCL transmittance and the surface temperature of the LED chip reduce with the increase in Gr and ZnO *** order to get the transmittance of the Gr/ZnO hybrid TCL higher than 80%,the appropriate combination of Gr/ZnO compound electrode should be a single layer of Gr with ZnO no thicker than 400 nm(1 L Gr/400-nm ZnO),2 L Gr/300-nm ZnO,3 L Gr/200-nm ZnO,or 4 L Gr/100-nm *** LEDs with hybrid TCLs consisting of 1 L Gr/300-nm AZO,2 L Gr/300-nm GZO,and 2 L Gr/300-nm IZO have good performance,among which the one with 1 L Gr/300-nm GZO has the best thermal ***,the temperature of LEDs with 1 L Gr/300-nm GZO hybrid TCLs will drop by about 7 K compared with that of the LEDs with a TCL without ZnO film.

关键词： finite element methods light-emitting diodes graphene ZnO

Numerical simulation for macrosegregation in direct-chill casting of 2024 aluminum alloy with an extended continuum mixture model

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Transactions of Nonferrous Metals Society of China 2018年第5期28卷 1007-1015页

作者： hai-jun luo Wan-qi JIE Zhi-ming GAO Yong-jian ZHENG State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇an 710072 China Chair of Simulation and Modeling of Metallurgical Processes Montan Universitaet Leoben 8700 Leoben Austria

An extended continuum mixture model for macrosegregation is applied to predicting Cu and Mg segregation in large-size ingot of 2024 aluminum alloy during direct chill casting（DC）. A microsegregation model using the approximate phase diagram data was coupled with macroscopic transport equations for macrosegregation profiles. Then, the impacts of transport mechanisms on the formation of macrosegregation were discussed. It is found that copper and magnesium have a similar segregation configuration from the billet center to surface. Negative segregation is observed in the centerline and subsurface, whereas positive segregation is obtained in the surface and somewhat underestimated positive segregation in the middle radius. Further, the discrepancy between the predicted and experimental results was discussed in detail. The results show that the magnesium to some extent alleviates the copper segregation in ternary alloy, compared with that in binary alloy. The predicted results show good agreement with measured experimental data obtained from literatures.

关键词： direct-chill casting macrosegregation numerical simulation continuum model 2024 aluminum alloy

Comparison of corrosion resistance of MgAl-LDH and ZnAl-LDH films intercalated with organic anions ASP on AZ31 Mg alloys

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Transactions of Nonferrous Metals Society of China 2020年第9期30卷 2424-2434页

作者： Jia-ling CHEN Liang FANG Fang WU Xian-guang ZENG Jia HU Shu-fang ZHANG Bin JIANG hai-jun luo Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials State Key Laboratory of Power Transmission Equipment&System Safety and New TechnologyCollege of PhysicsChongqing UniversityChongqing 400044China Material Corrosion and Protection Key Laboratory of Sichuan Province Institute of Materials Science and EngineeringSichuan University of Science and EngineeringZigong 643000China National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China College of Software Chongqing College of Electronic EngineeringChongqing 401331China Chongqing Key Laboratory on Optoelectronic Functional Materials College of Physics and Electronic EngineeringChongqing Normal UniversityChongqing 401331China

The aspartic acid(ASP),an environment-friendly corrosion inhibitor,was explored to intercalate into the ZnAl-layered double hydroxide(ZnAl-LDH)and MgAl-LDH coatings on AZ31 magnesium alloys by a facile one-step hydrothermal *** morphology,composition,structure and corrosion resistance of the prepared coatings were comparatively *** is found that the uniform and dense layered nanosheet(NS)vertically grows on the substrate,and the MgAl−ASP-LDH films exhibit a three-dimensional(3D)rose-like sheet structure with high ratio of pore *** MgAl−ASP-LDH coating exhibits better corrosion resistance and durability of longtime immersion than ZnAl−ASP-LDH *** corrosion current density of two coatings is two or three orders of magnitude lower than that of bare Mg alloy,indicating that ZnAl/MgAl-LDH films intercalated with organic ASP anions can significantly improve the corrosion resistance of Mg alloy.

关键词： hydrotalcite magnesium alloy aspartic acid corrosion resistance corrosion inhibitor

Revolutionizing breast cancer detection:Advances in fluorescent probe technology

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Nano Research 2025年第1期18卷 653-674页

作者： Qian Gao Lin Tang jun Zhan Yiyuan Xue Feng luo State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China Emergency Obstetrics and Gynecology West China Second University HospitalSichuan UniversityChengdu 610041China Department of Obstetrics and Gynecology West China Second University HospitalSichuan UniversityChengdu 610041China Department of Prosthodontics West China School of StomatologySichuan UniversityChengdu 610041China

With the increasing incidence of breast cancer globally,there is an urgent demand for enhanced diagnostic and therapeutic *** comprehensive review explores advancements in fluorescent probe technology for breast cancer imaging and early *** probes offer unparalleled sensitivity and specificity in detecting cancer biomarkers,enabling early diagnosis and delineation of tumor margins during *** categorize these probes into molecular,nano,ratiometric,the second near-infrared window(NIR-II),and multifunctional varieties,each with unique capabilities for targeting specific cancer *** review highlights recent innovations in probe design,emphasizing their applications in pathogenesis studies,drug development,precision medicine,and fluorescence-guided *** their promising clinical potential,challenges such as safety,biomarker targeting accuracy,system compatibility,and clinical translation *** these hurdles is crucial for the integration of fluorescent probes into standard cancer care,aiming to improve treatment outcomes and patient quality of life.

关键词： breast cancer fluorescent probes imaging early diagnosis biomarker

Photothermal probiotics delivery of photodynamic agents for enhanced immunogenic cell death within hypoxia center of solid tumors

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Nano Research 2025年第1期18卷 642-652页

作者： Wen luo Shiyu Du Yateng Jiang Bangshun He jun Tang Jingjing Yang Yujun Song Jiangsu Key Laboratory of Artificial Functional Materials State Key Laboratory of Analytical Chemistry for Life ScienceNational Laboratory of Solid State MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210023China Department of Laboratory Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006China Department of Anesthesiology Jinling HospitalMedical School of Nanjing UniversityNanjing 210000China Department of Biochemistry and Molecular Biology School of Medicine&Holistic Integrative MedicineJiangsu Collaborative Innovation Center of Chinese Medicinal Resources IndustrializationNanjing University of Chinese MedicineNanjing 210023China

Resulting from harsh hypoxic environmental conditions,central cells in the core of solid tumors are usually more aggressive and malignant with a less stable ***,therapeutic agents with improved penetration for the activation of immunity in tumor centers exhibit promising potential in ***,polydopamine-coated Escherichia coli Nissle 1917(EcN)bearing chlorin e6(Ce6)-loaded and polyethyleneimine(PEI)-coated hollow manganese dioxide(shorted as EP-ChP)are applied for enhanced immunotherapy in deep *** accumulation in tumor center through hypoxia targeting,manganese dioxide is degradated under the tumor microenvironment with released Ce6 and thus generates reactive oxygen species(ROS)upon 660 nm laser irradiation,which can further lower thermalresistance of cancer cells via HSP90α*** to that,heating induced by polydopamine upon 808 nm laser irradiation can achieve effective tumor *** upon dual laser induces enhanced immunogenic cell death,while bacterial infections in tumor tissues also trigger innate *** bacteria-based approach provides enhanced antitumor immune responses in deep tumors with great potential in the reshaping of immunosuppression tumor microenvironment.

关键词： bacteria phototherapies immunotherapy hypoxia targeting tumor penetration

不同冲洗时间对关节镜治疗老年化脓性膝关节炎的疗效分析

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中国骨伤 2017年第4期30卷 300-303页

作者：袁义章海均张波罗浩杨超宁波市第二医院骨科中心浙江宁波315010

目的 :探讨不同冲洗时间对于关节镜治疗老年化脓性膝关节炎的疗效。方法 :选取2012年10月至2014年10月收治的23例老年化脓性膝关节炎病例作为研究对象,采用关节镜下清理、置管及术后灌洗方法治疗,根据不同冲洗时间将患者分为冲洗1周组(1... 详细信息

目的 :探讨不同冲洗时间对于关节镜治疗老年化脓性膝关节炎的疗效。方法 :选取2012年10月至2014年10月收治的23例老年化脓性膝关节炎病例作为研究对象,采用关节镜下清理、置管及术后灌洗方法治疗,根据不同冲洗时间将患者分为冲洗1周组(10例)及冲洗2周组(13例),通过比较术后皮温恢复时间、C-反应蛋白(CRP)、血沉、关节活动度以及膝关节功能等评价两组治疗效果。结果 :23例均获随访,平均随访时间(13.3±2.3)个月,无一例复发。术后两组患者CRP均在2周时恢复正常;冲洗2周组血沉在术后2周恢复正常,1周组术后2周血沉仍高,在术后3周恢复正常,两组差异有统计学意义。术后膝关节皮温恢复正常时间1周组为10~20 d,平均(15.5±1.9)d;2周组8~17 d,平均(13.4±1.2)d,两组差异有统计学意义。术后1、3、6个月,患者膝关节活动度均较术前明显好转(P<0.05);术后1个月,2周组膝关节活动度较1周组明显好转(P<0.05);术后3、6个月,两组膝关节活动度差异无统计学意义。术后1、3、6个月,患者膝关节Lysholm评分均较术前明显好转(P<0.05);术后1个月,2周组膝关节Lysholm评分较1周组高(P<0.05);术后3、6个月,两周组膝关节Lysholm差异无统计学意义。所有患者术后3个月膝关节功能均已稳定,根据Lysholm评分,术后6个月1周组优3例,良6例,可1例;2周组优5例,良7例,可1例;两组差异无统计学意义。结论:采用关节镜技术治疗老年膝关节化脓性关节炎创伤小,清创彻底,有利于炎症的消除和膝关节功能的恢复,术后推荐冲洗2周,有利于患者膝关节功能早期康复。

关键词：关节镜灌洗疗法老年人关节炎,感染性膝关节

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论湖南耕地资源的保养与可持续利用

土壤 2004年第3期36卷 232-234,250页

作者：刘海军谭珅罗尊长湖南省土壤肥料研究所长沙410125

根据湖南人地矛盾突出的现实,分析了湖南耕地利用的现状与存在的问题及其原因,从政策法规、土地整理、耕地保养与生态环境保护、土地资源监测管理、农业结构调整诸方面,提出了实现湖南耕地资源持续利用的对策和措施。

关键词：湖南耕地资源保养可持续利用

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16层CT血管造影对主动脉夹层的诊断价值

实用放射学杂志 2008年第6期24卷 756-758页

作者：郑海军罗学军周海军左勤学王向日郴州市第一人民医院放射科郴州市第一人民医院放射科湖南郴州423000

目的探讨16层CT血管造影(16SCTA)对主动脉夹层的诊断价值和技术优势。方法对39例主动脉夹层进行16SCTA检查,采用多平面重建(MPR),曲面重建(CPR),容积再现(VR),最大密度投影(MIP)和仿真内镜(VE)多种图像后处理技术,并结合原始横断面增强... 详细信息

目的探讨16层CT血管造影(16SCTA)对主动脉夹层的诊断价值和技术优势。方法对39例主动脉夹层进行16SCTA检查,采用多平面重建(MPR),曲面重建(CPR),容积再现(VR),最大密度投影(MIP)和仿真内镜(VE)多种图像后处理技术,并结合原始横断面增强图像进行综合分析。结果根据DeBakey分型,本组39例主动脉夹层患者中,16SCTA显示Ⅰ型5例、Ⅱ型1例和Ⅲ型33例。显示真假腔39例(100%)、内膜片39例(100%)、内膜破口25例(64.1%)、假腔内血栓17例(43.6%)。结论16SCTA可作为主动脉夹层治疗前首选的影像学检查方法,价值可以肯定。

关键词：体层摄影术,X线计算机血管造影术主动脉夹层