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Effect of La on microstructure,mechanical properties and fracture behavior of Al/Mg bimetallic interface manufactured by compound casting

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Journal of Materials Science & Technology 2022年第10期105卷 214-225页

作者： Zheng Zhang Wenming Jiang Guangyu Li Junlong Wang Feng Guan guoliang Jie Zitian fan State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

To improve the Al/Mg bimetallic interface,La was added into the Al/Mg bimetallic interface manufactured by a compound casting *** effect of La addition on the microstructure,mechanical properties and fracture behavior of the Al/Mg bimetallic interface and the formation mechanism of the interface were studied in ***_(11)La_(3),Al_(8)Mn_(4)La,Al_(20)Ti_(2)La,and other rare earth precipitates(RE precipitates)preferentially precipitated at the interface with La addition,while the number of the Al_(11)La_(3)and Al_(8)Mn_(4)La located in eutectic structure area(E area)gradually increased and aggregated in the interface with the increase of the La ***,the matrix structure in different areas of the Al/Mg interface changed in different degrees,and the eutectic structure and primaryγ(Mg_(17)Al_(12))dendrites in the E area were refned,but the intermetallic compounds area(IMC area)had no obvious *** the addition of the La,the interface was strengthened under the comprehensive effect of refnement strengthening and precipitation strengthening from the E *** the La content increased to 1.0%,the shear strength of the Al/Mg bimetal reached the maximum of 51.54 MPa,which was 30.95%higher than the group without La ***,with the further increase of the La content,the large area aggregation of the Al_(11)La_(3)and Al_(8)Mn_(4)La occurred in the interface,leading to the separation of the matrix structure of the E area and the decrease of the shear strength of the Al/Mg interface.

关键词： Compound casting Al-Mg intermetallic compounds Rare earth La Al/Mg interface Microstructure Mechanical properties

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An acid-triggered porphyrin-based block copolymer for enhanced photodynamic antibacterial efficacy

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Science China Chemistry 2021年第3期64卷 459-466页

作者： fan Yu Chao Chen guoliang Yang Zhengtong Ren Hongliang Cao Liangshun Zhang Weian Zhang Shanghai Key Laboratory of Functional Materials Chemistry East China University of Science and TechnologyShanghai 200237China

Bacterial infection, especially multidrug-resistant(MDR) bacterial infection has threatened public health drastically. Here, we fabricate an "acid-triggered" nanoplatform for enhanced photodynamic antibacterial activity by reducing the aggregation of photosensitizers(PSs) in bacterial acidic microenvironment. Specifically, a functional amphiphilic block copolymer was first synthesized by using a pH-sensitive monomer, 2-(diisopropylamino) ethyl methacrylate(DPA) and porphyrin-based methacrylate(TPPC6MA) with poly(oligo(ethylene glycol) methyl ether methacrylate)(POEGMA) as the macromolecular chain transfer agent, and POEGMA-b-[PDPA-co-PTPPC6MA] block copolymer was further self-assembled into spherical nanoparticles(PDPA-TPP). PDPA-TPP nanoparticles possess an effective electrostatic adherence to negatively charged bacterial cell membrane, since they could rapidly achieve positive charge in acidic bacterial media. Meanwhile, the acid-triggered dissociation of PDPA-TPP nanoparticles could reduce the aggregation caused quenching(ACQ) of the photosensitizers, leading to around 5 folds increase of the singlet oxygen(1O2) quantum yield. In vitro results demonstrated that the "acid-triggered" PDPA-TPP nanoparticles could kill most of MDR S. aureus(Gram-positive) and MDR E. coli(Gram-negative) by enhanced photodynamic therapy, and they could resist wound infection and accelerate wound healing effectively in vivo. Furthermore, PDPA-TPP nanoparticles could well disperse the biofilm and almost kill all the biofilm-containing bacteria. Thus, by making use of the bacterial acidic microenvironment, this "acid-triggered" nanoplatform in situ will open a new path to solve the aggregation of photosensitizers for combating broad-spectrum drug-resistant bacterial infection.

关键词： photodynamic therapy antibacterial porphyrin aggregation caused quenching(ACQ)

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Hot deformation behavior and finite element simulation of Mg-8.3Gd-4.4Y-1.5Zn-0.8Mn alloy

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Journal of Rare Earths 2022年第5期40卷 831-839,I0006页

作者： Jiabin fan Minglong Ma Kui Zhang Yongjun Li Xinggang Li guoliang Shi Jiawei Yuan State Key Laboratory of Nonferrous Metals and Process GRINM Co.Ltd..Beijing 100088China GRIMAT Engineering Institute Co.Ltd Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China

To study the hot deformation behavior of Mg-8.3 Gd-4.4 Y-1.5 Zn-0.8 Mn(wt%) alloy,hot compression tests were conducted using a Gleeble-3500 thermal simulator at temperatures ranging from 653 to773 K,true strain rates of 0.001-1 s^(-1),and a deformation degree of 60%.Results of hot compression experiments show that the flow stress of the alloy increases with the strain *** true stress-true strain curves are corrected by correcting the effect of temperature rise in the deformation *** energy,Q,equal to 287380 J/mol and material constant,n,equal to 4.59 were calculated by fitting the true stress-true strain ***,the constitutive equation was established and verified via finite element *** of the hot processing map show that the probability of material instability increases with the degree of deformation,which indicates that the material is not suitable for large deformation in a single *** the whole,the alloy is appropriate for multipass processing with small deformation and a suitable processing temperature and strain rate are 733 K and 0.01 s-1,respectively.

关键词： Mg-Gd-Y-Zn-Mn alloy Hot deformation Constitutive relationship Finite element simulation Processing map Rare earths

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冠状动脉旁路移植术后患者高血糖影响因素分析

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天津护理 2019年第1期27卷 59-61页

作者：李民李权樊国亮李启文刘文贤黄然泰达国际心血管病医院天津300457

目的:了解冠状动脉旁路移植术后患者血糖控制情况,分析影响血糖升高的因素,为临床上高血糖的预防和降低血糖升高的护理措施提供依据。方法:回顾性分析2013至2016年单纯冠状动脉搭桥术患者418例,根据术后第1日早晨06:00时监测随机血糖值... 详细信息

目的:了解冠状动脉旁路移植术后患者血糖控制情况,分析影响血糖升高的因素,为临床上高血糖的预防和降低血糖升高的护理措施提供依据。方法:回顾性分析2013至2016年单纯冠状动脉搭桥术患者418例,根据术后第1日早晨06:00时监测随机血糖值分为未达标组(血糖≥10 mmol/L)和达标组,分析影响术后发生高血糖的因素。结果:术后第1天早晨06:00血糖升高与体外循环、体重指数、心脏手术危险因素、糖尿病史有关(P<0.05),与年龄、血管活性药物的应用无关。结论:心脏外科术后发生高血糖与多个因素有关,需采取相应措施以免高血糖事件的发生。

关键词：冠状动脉旁路移植术高血糖影响因素

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冠状动脉旁路移植术后肺部感染发生的危险因素分析

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中国循环杂志 2019年第2期34卷 139-143页

作者：樊国亮张英飞陈铁男刘志刚王正清谢继庆李志昊张波张宁泰达国际心血管病医院心脏外科术后监护室天津市300457 遵化市人民医院内分泌科泰达国际心血管病医院心脏外科天津市300457 泰达国际心血管病医院感染管理科天津市300457

目的:分析冠状动脉旁路移植术(CABG)后肺部感染发生的危险因素。方法:回顾性分析1 414例择期行CABG患者的临床资料,根据典型的临床表现、胸片检查以及呼吸道分泌物培养阳性结果,确诊术后肺部细菌性感染。对患者肺部感染可能相关因素进... 详细信息

目的:分析冠状动脉旁路移植术(CABG)后肺部感染发生的危险因素。方法:回顾性分析1 414例择期行CABG患者的临床资料,根据典型的临床表现、胸片检查以及呼吸道分泌物培养阳性结果,确诊术后肺部细菌性感染。对患者肺部感染可能相关因素进行多因素Logistic回归分析。结果:42例(2.97%)患者确诊为术后肺部感染。相较于无肺部感染组,肺部感染患者年龄较大,吸烟、心脑血管病史比例高,左心室舒张末直径较大,左心室射血分数(LVEF)48 h(OR=7.457,95%CI:3.44～16.161)、术前长期吸烟(OR=2.20,95%CI:1.018～4.825)、LVEF48 h、术前长期吸烟及LVEF低下是CABG后肺部感染发生的独立危险因素,临床上应积极采取必要措施加以预防,以期进一步改善预后。

关键词：体外循环冠状动脉旁路移植术肺内感染急性肾损伤危险因素

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Effect of vibration on interfacial microstructure and mechanical properties of Mg/Al bimetal prepared by a novel compound casting

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Journal of Magnesium and Alloys 2022年第8期10卷 2296-2309页

作者： Feng Guan Wenming Jiang Guangyu Li Junwen Zhu Junlong Wang guoliang Jie Zitian fan State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

In this work,a vibration was applied in the preparation of the Mg/Al bimetal by a novel compound casting in order to improve the mechanical properties of the Mg/Al bimetal,and the effect of the vibration on the interfacial microstructure and mechanical properties of the Mg/Al bimetal was *** results indicated that the vibration had a significant effect on the interfacial microstructure and mechanical properties of the Mg/Al bimetal,but it did not change the phase compositions of the interface,which was composed of layerⅠ(Al3Mg2+Mg2Si),layerⅡ(Al_(12)Mg_(17)+Mg_(2)Si)and layerⅢ(Al_(12)Mg_(17)/δ-Mg).Without vibration,the Mg_(2)Si phase with a needle-like morphology mainly aggregated in the layerⅡof the *** the application of the vibration,the SEM and EBSD analysis results showed that the Mg_(2)Si and Al3Mg2phases in the interface were obviously refined,and the distribution of the Mg_(2)Si became more uniform,due to the strong forced convection of the molten metal resulting from the *** TEM analysis indicated that the interface between the A_(l3)Mg_(2) and Mg_(2)Si phases was non-coherent,suggesting the Mg_(2)Si particles cannot act as a heterogeneous nucleation base during the solidification process of the *** to the Mg/Al bimetal without vibration,the shear strength of the Mg/Al bimetal with vibration increased by about 50%from 31.7 MPa on average to 47.5 MPa,and the hardness of the layer I of the interface increased,and the hardness of the layerⅢ*** fracture surface transformed from a flat fracture morphology without vibration to an irregular zigzag fracture morphology.

关键词： Mg/Al bimetal Vibration Compound casting Interfacial microstructure Bonding properties

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规模化猪场废水中主要抗生素、抗生素抗性基因检测和细菌群落分析

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中国兽医杂志 2024年第12期60卷 11-19页

作者：刘锐樊国良郁辉赵海云嘉兴职业技术学院现代农业学院浙江嘉兴314036 嘉兴市秀洲区王店镇农业农村办公室浙江嘉兴314008

为了探究浙江省嘉兴市规模化猪场废水处理设施对抗生素、抗生素抗性基因(ARGs)的降解效果和对细菌群落的影响。本试验对嘉兴市10家规模化猪场废水处理前后,磺胺类和四环素类抗生素及其主要ARGs含量进行了检测,并探究了废水处理前后细菌... 详细信息

为了探究浙江省嘉兴市规模化猪场废水处理设施对抗生素、抗生素抗性基因(ARGs)的降解效果和对细菌群落的影响。本试验对嘉兴市10家规模化猪场废水处理前后,磺胺类和四环素类抗生素及其主要ARGs含量进行了检测,并探究了废水处理前后细菌群落变化情况。结果显示,嘉兴市规模化猪场废水处理工艺可以有效降低磺胺类和四环素类抗生素含量以及ARGs绝对含量,但无法有效降低ARGs相对丰度;上流式厌氧污泥床(UASB)+序批式活性污泥(SBR)工艺处理抗生素残留效果最佳,但无法有效降低所有ARGs相对丰度,而UASB+A^(2)/O生化处理工艺和膜生物反应器(MBR)工艺对降低ARGs污染有一定效果;变形菌门、放线菌门、厚壁菌门和拟杆菌门是嘉兴市规模化猪场废水原水样品中优势菌群,变形菌门在出水样品中占绝对优势。本试验结果可以为嘉兴市全面评估规模化猪场养殖生态环境质量提供数据支持,并为降低嘉兴市规模化猪场废水中抗生素和抗生素抗性基因污染提供技术参考。

关键词：规模化猪场废水抗生素抗生素抗性基因细菌群落

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以羟基磷灰石为填料高效液相制备色谱法提纯基因重组人白细胞介素-2

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分析化学 2000年第4期28卷 528-528页

作者：郝茜闫颖范国梁赵秋雯刘迎五王建林万冬林 300072 300191 中国医学基金会医学生物技术研究所!天津天津大学分析中心!天津

1 引言本研究尝试一种新的填料羟基磷灰石(HAP)用梯度洗脱方法分离纯化基因重组人白细胞介素-2(IL-2).研究结果表明,用本实验方法,大量上样提纯后的IL-2在纯度、活性等方面均满足要求,效果良好.

关键词：羟基磷灰石重组人白细胞介素 HAP 磷酸盐缓冲液分离提纯高效液相制备色谱流动相基因

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Palladium Nanoparticle-Graphene Hybrids as Active Catalysts for the Suzuki Reaction

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Nano Research 2010年第6期3卷 429-437页

作者： Yang Li Xiaobin fan Junjie Qi Junyi Ji Shulan Wang guoliang Zhang Fengbao Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Graphene has been successfully modified with palladium nanoparticles in a facile manner by reducing palladium acetate [Pd(OAc)2] in the present of sodium dodecyl sulfate (SDS), which is used as both surfactant and the reducing agent. The palladium nanoparticle-graphene hybrids (Pd-graphene hybrids) are characterized by high- resolution transmission electron microscopy, atomic force microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy. We demonstrate that the Pd-graphene hybrids can act as an efficient catalyst for the Suzuki reaction under aqueous and aerobic conditions, with the reaction reaching completion in as little as 5 min. The influence of the preparation conditions on the catalytic activities of the hybrids is also investigated.

关键词： Graphene Pd nanoparticles hybrids catalyst Suzuki reaction

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Molecular fossil and paleovegetation records of paleosol S4 and adjacent loess layers in the Luochuan loess section, NW China

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Science China Earth Sciences 2008年第3期51卷 321-330页

作者： ZHANG HuCai YANG MingSheng ZHANG WenXiang LEI guoliang CHANG FengQin PU Yang fan Hongfang Key Laboratory of Western China’s Environmental Systems Ministry of EducationCollege of Earth and Environment SciencesLanzhou UniversityLanzhou 730000China State Key Laboratory of Lake and Environment Sciences Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China

Using gas chromatography-mass spectrometry (GC-MS) technique, a series of biomarkers were identi- fied, including n-alkanes, n-alkane-2-ones, isoprenoid etc. from the loess-paleosol samples collected from the S4 and adjacent L5, L4 of the Luochuan loess section, Northwestern China. Based on these data, especially n-alkanes and high-resolution magnetic susceptibility and grain size data, the pa- leoenvironment and paleovegetation history during S4 was reconstructed. The CPI (Carbon Predomi- nance Index) and correlation between n-alkanes and magnetic susceptibility and grain size data dem- onstrated that the molecular fossils in paleosol and loess layers can reflect the vegetation condition during the loess-paleosol formation, if the allochthonous organic inputs could be excluded reasonably. The ACL (average chain length) index is correlated well with paleomagnetic susceptibility and grain size variations, displaying their good synchrony with warm and humid climate. However, it relatively lagged behind the paleomagnetic susceptibility and the grain size variations when the climate began to deteriorate. During the formation period of paleosol, the n-alkanes was dominated by C31 homologue, indicating that the primary organic input originated from herbs. Our study also demonstrated that the herbs were more flourish than wood plants in Loess Plateau, especially in the Luochuan area during the warm and humid phase, and there was no typical forest vegetation developed in the studied period.

关键词： paleoenvironment Paleosol S4 Luochuan loess section biomarker paleovegetation

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