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Effect of nano-CaO particle on the microstructure,mechanical properties and corrosion behavior of lean Mg-1Zn alloy

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Journal of Magnesium and Alloys 2024年第2期12卷 794-814页

作者： Guangxin Shen Shaoyuan Lyu Leiting Yu tianlu li Chen You Xuewei Wang Minfang Chen Bin Jiang School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Key Laboratory of Display Materials and Photoelectric Device(Ministry of Education) Tianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Function Materials Education Tianjin University of TechnologyTianjin 300384China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China

The effects of nano-CaO contents on the microstructure,mechanical properties and corrosion resistance of lean Mg-1Zn alloy were *** results showed that the addition of nano-CaO significantly refined the grain size and improved mechanical properties of the Mg-1Zn *** the same time,CaO reacted with molten Mg in situ to form nano-MgO,whose corrosion product in SBF solution was the same with the degradation product of Mg matrix,resulting in the enhanced compactness of the Mg(OH)_(2) layer and reduced corrosion rate of *** Mg-1Zn alloy had lower corrosion resistance due to excessively large grain size and shedding of corrosion *** composite with 0.5 wt.%CaO had the best corrosion resistance with a weight loss of 9.875 mg·y^(-1)·mm^(-2)due to the small number of Ca_(2)Mg_(6)Zn_(3) phase and suitable grain *** for composites with high content of CaO(0.7 wt.%and 1.0 wt.%),they had lower corrosion resistance due to the coexistence of large number of Ca_(2)Mg_(6)Zn_(3) and Mg_(2)Ca at grain boundaries,especially for 1.0 wt.%CaO composite,resulting from the strong micro-galvanic corrosion.

关键词： Lean Mg alloy In situ MgO Nanoparticles Grain refinement Corrosion resistance

Divergent Synthesis of Core m1,Core m2 and Core m3 O-Mannosyi Glycopeptides via a Chemoenzymatic Approach

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Chinese Journal of Chemistry 2022年第13期40卷 1571-1577,I0002页

作者： tianlu li Youqin Zhang Tong li Haoru Zhuang Fengshan Wang Ning Wang Richard R.Schmidt Peng Peng National Glycoengineering Research Center Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyNMPA Key Laboratory for Quality Research and Evaluation of Carbohydrate Based MedicineShandong UniversityQingdaoShandong 266237China Shenzhen Research Institute of Shandong University ShenzhenGuangdong 518057China Key Laboratory of Carbohydrate Chemistry and Biotechnology Ministry of EducationSchool of BiotechnologyJiangnan UniversityWuxiJiangsu214122China Department of Chemistry University of KonstanzKonstanz D-78457Germany

O-Mannosylation plays a vital role in the regulation of a variety range of biological processes,for instance,brain and muscle ***,the precise function remains largely unknown due to its innate *** this regard,it is still welcome to develop efficient methods to access diverse structurally-defined *** this study,a diversity-oriented assembly of O-mannosylα-dystroglycan(α-DG)glycopeptides has been achieved via a chemoenzymatic *** strategy features(i)gram scale divergent synthesis of core m1,core m2 and core m3 mannosylated amino acids from judiciously designed protecting group strategies and chemical glycosidation;(i)efficient glycopeptide assembly via the optimized microwave-assisted solid phase peptide synthesis(SPpS);and(ii)enzymatic elaboration of the core glycan structures to install galactosyl and sialyl-galactosyl *** efficiency and flexibility of this chemoenzymatic approach was demonstrated with the construction of 12 glycopeptides with different core m1,core m2 and core m3 mannosyl glycans,including a core m2 glycopeptide bearing a heptasaccharide for the first time.

关键词： Glycopeptides oligosaccharides Regioselectivity Enzyme catalysis Divergent synthesis

Concise Synthesis of Lactococcus garvieae lipoteichoic Acids Through an Additive-Modulated Preactivation Protocol and the Immunological Studies

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CCS Chemistry 2024年第2期6卷 403-414页

作者： tianlu li Tong li Yue Yang Haoru Zhuang Jianwu Lv Ning Zhou Miaomiao Zhang Fengshan Wang Yiqun Geng Richard R.Schmidt Peng Peng National Glycoengineering Research Center Shandong Key Laboratory of Carbohydrate Chemistry and GlycobiologyNMPA Key Laboratory for Quality Research and Evaluation of Carbohydrate Based MedicineShandong UniversityQingdao 266237 State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050 Department of Chemistry University of KonstanzD-78457 Konstanz

lipoteichoic acids(LTAs)are macroamphiphiles composed of alditol,lipid,phosphate,and carbohydrate *** to their inherent complexity,it is a severe challenge to access LTAs with structural integrity from natural sources for biological or immunological ***,we describe the first total synthesis of Lactococcus garvieae LTA(type II LTA),containing five distinct 1,2-cis gluco/galactopyranosidic linkages,via a novel additive-modulated O-glycosyl trichloroacetimidate preactivation glycosidation *** strategy features(1)high glycosidation yields and excellent 1,2-cis stereoselectivities independent of the donor anomeric configuration,(2)common and inexpensive reagents as promoters and additives,(3)application to standard glycosyl imidate donors without resorting to participating protection,and(4)general application to reactive and less reactive glycosyl ***,via the precise stereocontrolled construction of three galactopyranosidic and two glucopyranosidic bonds on a multigram scale,a series of structurally well-defined LTA molecules were successfully *** evaluation of these type II synthetic LTAs showed a structure–activity relationship in the stimulation of a proinflammatory response.

关键词： 1,2-cis glycosidation stereoselectivity lipoteichoic acid total synthesis additive-modulated trichloroacetimidate glycosidation immune response

Regioselective Benzoylation of Diols,Triols and Tetraols Arrays in Carbohydrates

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Regioselective Benzoylation of Diols,Triols and Tetraols Arr...

中国化学会第三届全国糖化学会议

作者： Tong li tianlu li Richard R.Schmidt Peng Peng National Glycoengineering Research Center Shandong University

Efficient strategies and powerful linkage procedures for accessing complex oligosaccharides and glycoconjugates of biological significance have been *** overcome some difficulties of tedious protection-deprotection protocols,we are searching for direct protection methods targeting a specific hydroxy group,thus permitting a more efficient preparation of proper glycosyl building blocks for the oligosaccharide *** the present study,cyanide was envisaged to be capable of differentiating between differently positioned hydroxy ***,with 1,2-cis-diols,having an equatorial and an axial hydroxy group,the thermodynamically unfavorable axial O-acylation product was highly regioselectively formed by benzoyl cyanide or acetyl cyanide as acylating agent and DMAP as catalyst at-78 o C;acyl migration was not observed under these *** phenomenon was verified with 3,4-O-unproteced galacto-and fucopyranosides and 2,3-O-unprotected *** this cyanide effect was used in series of oligosaccharides synthesis.

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随钻电磁波传输理论模型与信道特性分析

电波科学学报 2013年第5期28卷 909-914页

作者：范业活聂在平李天禄电子科技大学四川成都611731 中国电波传播研究所河南新乡453003

为了促进国内随钻电磁波传输技术进步、仪器研发和推广,通过比较优选激励方式,并在此基础上进行理论研究.在均质等效传输线模型的基础上,结合分段均匀传输线理论建立理论模型,通过计算结果与现场试验结果比较,验证了模型的正确性.利用... 详细信息

为了促进国内随钻电磁波传输技术进步、仪器研发和推广,通过比较优选激励方式,并在此基础上进行理论研究.在均质等效传输线模型的基础上,结合分段均匀传输线理论建立理论模型,通过计算结果与现场试验结果比较,验证了模型的正确性.利用均质等效传输线模型计算分析信道特性,分析表明地层电阻率、钻柱单位长度的电阻、激励源频率是影响信号传输的主要因素.

关键词：电磁波随钻测量等效传输线模型信道

突破性创新的市场环境与技术环境分析——以我国视频监控行业为例

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科技进步与对策 2008年第9期25卷 7-10页

作者：吴爱华李天录鲁东大学管理学院山东烟台264025 烟台东方电子信息产业股份有限公司山东烟台264025

随着技术及经济的发展,突破性技术创新的研究正在兴起,主要关注影响突破性创新的外在环境因素,包括技术环境与市场环境,并指出了一种不同的突破性创新的市场轨道图。在这种轨道中,突破性创新由高端市场的集中客户开始侵入,并向低端市场... 详细信息

随着技术及经济的发展,突破性技术创新的研究正在兴起,主要关注影响突破性创新的外在环境因素,包括技术环境与市场环境,并指出了一种不同的突破性创新的市场轨道图。在这种轨道中,突破性创新由高端市场的集中客户开始侵入,并向低端市场渗透。最后对我国视频监控行业的发展进行了实证分析。

关键词：突破性技术创新市场环境技术环境视频监控

采用二氯马来酰亚胺与芳香胺的亲核取代聚合反应合成有机多孔聚合物

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功能高分子学报 2019年第2期32卷 178-183页

作者：李甜禄张勇李保君赵鹏胡爱国华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室上海200237

首先以二氯马来酸酐和1,2-环己二胺为原料合成了卤代烃1,2-双(3,4-二氯马来酰亚胺)基环己烷;然后通过该卤代烃与1,3,5-三(4-氨基苯基)苯的亲核取代聚合反应,制备了一种有机多孔聚合物(POP)。采用扫描电子显微镜(SEM)、热重分析(TG)、氮... 详细信息

首先以二氯马来酸酐和1,2-环己二胺为原料合成了卤代烃1,2-双(3,4-二氯马来酰亚胺)基环己烷;然后通过该卤代烃与1,3,5-三(4-氨基苯基)苯的亲核取代聚合反应,制备了一种有机多孔聚合物(POP)。采用扫描电子显微镜(SEM)、热重分析(TG)、氮气吸附-脱附等测试手段对聚合物的形貌、稳定性以及孔结构进行了研究。结果表明:该多孔聚合物具有独特的棒状结构、优良的热稳定性(初始分解温度达400℃)、较大的比表面积(404m^2/g),且具有多级孔(介孔和微孔)结构。

关键词：二氯马来酰亚胺芳香胺亲核取代聚合反应有机多孔聚合物

情绪自旋与大学生攻击行为:情绪调节策略的调节作用

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心理科学 2024年第4期47卷 966-972页

作者：张珊珊李亚林李天路李昱汝鞠睿刘婷天津职业技术师范大学职业教育学院天津300222 天津市普通高等学校人文社科重点研究基地职业教育发展研究中心天津300222

研究探讨了情绪调节策略在情绪自旋对大学生攻击行为影响中的调节作用。采用分阶段跟踪测试的方法,首先在被试招募阶段使用情绪调节量表测量个体的认知重评和表达抑制策略,招募完成一周后启动为期14天、每天3次的当下核心情绪状态测评... 详细信息

研究探讨了情绪调节策略在情绪自旋对大学生攻击行为影响中的调节作用。采用分阶段跟踪测试的方法,首先在被试招募阶段使用情绪调节量表测量个体的认知重评和表达抑制策略,招募完成一周后启动为期14天、每天3次的当下核心情绪状态测评来获取个体的情绪自旋值,动态测评结束一周后使用“攻击行为量表”测量个体的攻击行为。对139名被试的有效跟踪数据进行分析,结果表明:认知重评在情绪自旋对攻击行为的影响中起到调节作用。在低认知重评组,情绪自旋对攻击行为有正向预测作用;但在高认知重评组,情绪自旋对攻击行为的影响不显著。

关键词：情绪自旋攻击行为认知重评表达抑制

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我国低碳园林建设与实施途径初探

江西科学 2017年第5期35卷 722-726页

作者：李天禄余本锋张绿水江西农业大学园林与艺术学院南昌330045 江西省林业调查规划研究院南昌330046

在全球气候变暖的时代背景下,低碳园林已经成为我国风景园林行业发展的必由之路。低碳园林建设涉及到园林绿化的整个生命过程,应该从园林绿地布局、园林绿地设计、园林绿地施工和园林绿地管护4个层面加快推进我国低碳园林建设,期望能对... 详细信息

在全球气候变暖的时代背景下,低碳园林已经成为我国风景园林行业发展的必由之路。低碳园林建设涉及到园林绿化的整个生命过程,应该从园林绿地布局、园林绿地设计、园林绿地施工和园林绿地管护4个层面加快推进我国低碳园林建设,期望能对我国低碳园林建设提供一些思路上的借鉴,推动我国低碳园林的研究与实践。

关键词：低碳园林园林绿地布局设计施工管护实施途径