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退变性半月板损伤与下肢力线的相关性研究

陆军军医大学学报 2024年第3期46卷 283-287页

作者：张慧林谢峰徐明灯马剑董博赞何小强重庆重庆医科大学附属第三医院(捷尔医院)骨科重庆401120

目的比较退变性内侧半月板损伤与外侧半月板损伤之间下肢力线差异,探究半月板损伤与下肢力线之间的关系。方法收集2019年3月至2022年3月经关节镜手术治疗的退变性半月板损伤患者90例,其中男性45例,女性45例;年龄40~59岁,中位年龄52岁... 详细信息

目的比较退变性内侧半月板损伤与外侧半月板损伤之间下肢力线差异,探究半月板损伤与下肢力线之间的关系。方法收集2019年3月至2022年3月经关节镜手术治疗的退变性半月板损伤患者90例,其中男性45例,女性45例;年龄40~59岁,中位年龄52岁。内侧半月板损伤组47例,外侧半月板损伤组43例。在全长片上测量髋-膝-踝角(HKA角)并比较两组间差异。结果内侧半月板损伤组与外侧半月板损伤组患者性别、年龄、下肢侧别、体质量指数、损伤部位、损伤类型差异无统计学意义。内侧半月板损伤组HKA角为(177.20±2.46)°,外侧半月板损伤组为(181.05±3.13)°,两组差异有统计学意义(P<0.01)。结论退变性内侧半月板损伤与外侧半月板损伤之间HKA角存在差异,下肢力线与退变性半月板损伤存在关联。

关键词：退变性半月板损伤下肢力线 HKA角

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多品种变批量产品自动化生产线高效加工技术

金属加工（冷加工） 2024年第1期 43-46页

作者：贺潇强武晓光王萌邢鹏高旭东北京星航机电装备有限公司北京100074

以两条自动化生产线为基础,阐述了生产线加工中零件种类多状态复杂、单工序加工时间少、品种变换频繁及生产线运行节拍卡顿不流畅等情况,并分析导致数控机床利用率低、生产线效率低下的主要原因;基于制造痛点创新研究了多品种变批量产... 详细信息

以两条自动化生产线为基础,阐述了生产线加工中零件种类多状态复杂、单工序加工时间少、品种变换频繁及生产线运行节拍卡顿不流畅等情况,并分析导致数控机床利用率低、生产线效率低下的主要原因;基于制造痛点创新研究了多品种变批量产品在生产线高效加工技术,实现了自动化智能生产线的高效加工和设备利用率最大化,对于发展智能制造技术、构建自动生产线和落实智能制造在生产中的应用具有较好的参考价值。

关键词：多品种变批量自动化生产线高效加工

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N-甲基哌啶的合成方法研究

浙江化工 2024年第2期55卷 24-28页

作者：何小强郝磊向龙李倩文重庆华歌生物化学有限公司重庆404000

目的:建立N-甲基哌啶的合成方法并考察合成条件对其含量的影响。方法:以哌啶、甲醛为原料,以甲酸钠和甲酸为还原剂,经烷基化得N-甲基哌啶溶液,再经环己烷萃取及精馏得N-甲基哌啶。结果:在哌啶、还原剂组分、甲醛投料摩尔比为1:1.2:1.2,... 详细信息

目的:建立N-甲基哌啶的合成方法并考察合成条件对其含量的影响。方法:以哌啶、甲醛为原料,以甲酸钠和甲酸为还原剂,经烷基化得N-甲基哌啶溶液,再经环己烷萃取及精馏得N-甲基哌啶。结果:在哌啶、还原剂组分、甲醛投料摩尔比为1:1.2:1.2,滴加速度为3.33 mL/min,滴加时间为60 min,反应温度为80℃的最佳条件下反应3 h,得到的N-甲基哌啶含量为99.1%;经环己烷萃取,精馏后,含量为99.5%,收率为98.7%。结论:该方法反应条件温和、产品纯度高、工艺简单、易实现工业化。

关键词： N-甲基哌啶烷基化反应环己烷合成萃取

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EPC总承包项目中团队协作策略研究

陶瓷 2024年第2期 188-190,200页

作者：何晓强甘肃省建设设计咨询集团有限公司兰州730000

EPC总承包项目涉及项目管理、技术实施与辅助保障等多个团队的参与,需要各方高度协调配合才能取得成功。项目团队之间以及与业主之间的互信与通力合作,关系到工作效率、工程质量以及最终满意度。因此,团队协作水平的提升是EPC项目获得... 详细信息

EPC总承包项目涉及项目管理、技术实施与辅助保障等多个团队的参与,需要各方高度协调配合才能取得成功。项目团队之间以及与业主之间的互信与通力合作,关系到工作效率、工程质量以及最终满意度。因此,团队协作水平的提升是EPC项目获得优异成果的重要保证。基于此,笔者主要探讨了EPC项目团队协作的重要性,存在的主要问题以及如何制定对策提高协作效能等内容,以期为实践中协作机制的完善提供参考。

关键词： EPC总承包项目团队协作策略

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Shape and size effects of ceria nanoparticles on the impact strength of ceria/epoxy resin composites

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Particuology 2011年第1期9卷 80-85页

作者： xiaoqiang he Dengsong Zhang Hongrui Li Jianhui Fang Liyi Shi Research Center of Nano Science and Technology Shanghai University Shanghai 200444 China Department of chemistry Shanghai University Shanghai 200444 China

Ceria nanoparticles with various shapes （rods, cubes, and plates） and sizes were controllably synthesized and then introduced into epoxy resin. Subsequently, we investigated correlations between the shape and size of ceria nanostructures and the mechanical performance of composites. The samples were character- ized by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. Compared with commercial ceria filled composites, the composites made with morphology-controlled ceria nanos- tructures show a higher impact strength. It is found that epoxy resins made with high-aspect-ratio ceria nanorods show the highest impact strength, up to 17.27 kJ/m2, which is about four times that of the neat epoxy resin.

关键词： Nanoparticles Ceria Composite Mechanical properties

Effect of Ball-Milling Time on the Performance of Ni-Al2O3 Catalyst for 1,4-Butynediol Hydrogenation to Produce 1,4-Butenediol

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China Petroleum Processing & Petrochemical Technology 2020年第1期22卷 78-86页

作者： Gao Xianlong Mo Wenlong Ma Fengyun he xiaoqiang Key Laboratory of Coal Clean Conversion&Chemical Engineering Process(Xinjiang Uyghur Autonomous Region) College of Chemistry and Chemical EngineeringXinjiang UniversityUrumqi 830046

The Ni-Al2O3 catalyst was prepared by the mechanochemical method in combination with a planetary ballmilling *** of milling time on the crystal structure,the reduction characteristics and the catalytic performance of Ni-Al2O3 catalyst for hydrogenation of 1,4-butynediol to produce 1,4-butenediol were *** catalysts were characterized by PSD,EDX,XRD,H2-TPR,BET,TEM,and NH3-TPD *** showed that the MCt2.5 catalyst treated at a ball milling time of 2.5 h could form a smallest particle size of 191.0 *** evaluation experiments revealed that the activity of the prepared catalyst increased at first and then reached a constant value with the extension of ballmilling *** BYD conversion,BED selectivity and yield on the MCt2.5 catalyst reached 35.63%,33.48%and 32.46%,respectively,which were higher than those obtained by other *** excellent performance of MCt2.5 sample is mainly related to the following three reasons from characterization ***,it has a smallest particle size of 191.0 nm;and then,the surface acidity(in terms of strong acids)of the catalyst was weaker than other catalysts;and eventually,the loading amount(23.84%)of the active component Ni exceeded the theoretical value(20%).

关键词： mechanochemical method Ni-Al2O3 catalyst 1 4-butynediol ball-milling time

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麦洼牦牛程序化人工授精技术操作规程

现代畜牧科技 2024年第2期 86-88页

作者：王燕文李小伟何小强赵晓东贾运强谭雄周兴益西拉姆周凡莉四川省龙日种畜场四川红原624400

牦牛是川西北地区重要的生产、生活资料,与牧区人民的生活息息相关。为更好的开展牦牛繁育工作,提高牦牛数量、提升牦牛质量,最大限度的发挥优质种公牛价值,通过运用现代生物学手段同期发情和人工授精技术提升牦牛受胎率和繁殖率,促进... 详细信息

牦牛是川西北地区重要的生产、生活资料,与牧区人民的生活息息相关。为更好的开展牦牛繁育工作,提高牦牛数量、提升牦牛质量,最大限度的发挥优质种公牛价值,通过运用现代生物学手段同期发情和人工授精技术提升牦牛受胎率和繁殖率,促进川西北牧区草原畜牧业高质量发展,该文主要阐述牦牛程序化人工授精操作规程,希望给牦牛养殖户提供参考。

关键词：麦洼牦牛同期发情人工授精操作规程

Solvent-free carbon sphere nanofluids towards intelligent lubrication regulation

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Friction 2024年第1期12卷 95-109页

作者： Sheng ZHANG Wen LI Xiaoliang MA xiaoqiang FAN Minhao ZHU Tribology Research Institute School of Mechanical EngineeringSouthwest Jiaotong UniversityChengdu 610031China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China

By simply switching the electrical circuit installed on steel/steel contact,the tribological behaviors of nanofluids(NFs)can be regulated in real time,thereby achieving the desired performance of friction reduction and wear ***,solvent-free carbon spherical nanofluids(C-NFs)were successfully prepared for intelligent lubrication regulation.C-NFs with excellent lubrication performance can immediately reduce the coefficient of friction(COF)despite applying a weak electric potential(1.5 V).Moreover,polyethylene glycol 400(PEG400)containing 5.0 wt%C-NFs remained responsive to electrical stimulation under the intermittent voltage application with an average coefficient of friction(ACOF)reduction of 20.8%over *** intelligent lubrication regulation of C-NFs under an external electric field(EEF)mainly depends on the orderly arranged double-electric adsorption film of ion canopy-adsorbed carbon spheres(CSs).The intermittent electrical application can continuously reinforce the adsorption film and its durability for real-time controlling the sliding ***-stimulation-responsive intelligent lubricants provide a new technical support for realizing intelligent stepless control of devices.

关键词： solvent-free carbon spherical nanofluids(C-NFs) intelligent lubrication regulation lubrication performance adsorption film

Improving the high cycle fatigue property of Ti6Al4V ELI alloy by optimizing the surface integrity through electric pulse combined with ultrasonic surface rolling process

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Journal of Materials Science & Technology 2024年第3期170卷 103-121页

作者： Pengfei Sun Shengguan Qu Chenfeng Duan Xiongfeng Hu xiaoqiang Li National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640China

To improve the surface integrity and high cycle fatigue property of Ti6Al4V ELI alloy,the electric pulse has been introduced into the ultrasonic surface rolling process(USRP),which is called electric pulse-assisted ultrasonic surface rolling process(EUSRP).With the help of“electroplasticity”of the electric pulse,the thickness of the surface gradient deformation layer was about three times of the USRP specimens by adjusting the pulse current ***,the surface hardness decreases due to the continuous effect of the pulse current and the“skin effect”during *** is worth noting that the higher the applied pulse current,the more severe the *** paradox causes the fatigue performance of EUSRP specimens lower than that of USRP *** break this paradox,the EUSRP treatment is followed by a USRP *** EUSRP-2(with a pulse current of 200 A)+USRP specimens exhibit excellent surface hardness,a gradient deformation layer thickness of about 400μm,low surface roughness and high compressive residual compressive ***,the hardening mechanisms of the different surface strengthening specimens have been quantitatively analyzed in combination with microstructure *** fatigue life of Ti6Al4V ELI alloy can be improved by about 25 times at 780 MPa using the EUSRP-2+USRP treatment,the main reason for the highest fatigue life is the deepest surface gradient layer and the deepest crack initiation *** fatigue limit of the EUSRP-2+USRP specimens is not the highest because too much surface hardening causes compressive residual stress relaxation during cycling and the beneficial effect of compressive residual stress is eliminated.

关键词： Ti6Al4V ELI alloy Combined surface treatment Transmission electron microscopy Residual stress Fatigue performance