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Luminescent Tetra-nuclear Lanthanide-titanium-organic Compound Obtained by the Mixed-ligand

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Chinese Journal of Structural Chemistry 2021年第12期40卷 1668-1672,1555页

作者： CHEN Bing-Ben zhao Wen-zhuo CHEN Zi-Bin WEN Yi-Hang CHENG Jian-Wen Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhuaZhejiang 321004China

A new heterometallic lanthanide-titanium-organic compound:[Eu_(2)Ti_(2)(dip)_(6)(dig)_(2)(H_(3)0)_(2)].solvent(1,dip=diphenylglycolic acid,dig=diglycolic acid)has been synthesized under solvothermal *** 1 contains a tetra-nuclear{Eu_(2)Ti_(2)}unit with the mixed ligands of dip and *** 1 displays intense red ***,the IR,PXRD,UV-vis and TGA spectra were also studied.

关键词： lanthanide titanium luminescence

回火处理对15Cr12MoVN钢显微组织和冲击吸收能量的影响

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材料热处理学报 2017年第12期38卷 50-56页

作者：赵卓东北大学材料科学与工程学院辽宁沈阳110819

采用光学显微镜(OM)和扫描电镜(SEM)研究了15Cr12MoVN马氏体钢在回火处理过程中的组织转变规律及回火处理对冲击吸收功的影响。结果表明:回火处理后15Cr12MoVN马氏体钢中的主要析出相是M23C6碳化物,分布在原奥氏体晶界和板条界上。当回... 详细信息

采用光学显微镜(OM)和扫描电镜(SEM)研究了15Cr12MoVN马氏体钢在回火处理过程中的组织转变规律及回火处理对冲击吸收功的影响。结果表明:回火处理后15Cr12MoVN马氏体钢中的主要析出相是M23C6碳化物,分布在原奥氏体晶界和板条界上。当回火温度由700℃增加到800℃时,碳化物析出数量增加,颗粒尺寸增大,分布均匀性得到显著改善;原奥氏体晶界上的碳化物形貌由细小、离散的颗粒状向粗大、连续的颗粒状转变,而板条界上的碳化物形貌均保持细小的颗粒状或短棒状。随回火温度增加,15Cr12MoVN马氏体钢韧脆转变温度(DBTT)降低,在750~800℃范围内达到最低值,冲击断口结晶状区由完全解理断裂向塑性撕裂和局部韧窝转变。

关键词： 15Cr12MoVN钢回火处理碳化物冲击吸收能量

镍基高温合金U720Li的熔化和凝固过程原位观察

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稀有金属材料与工程 2020年第11期49卷 3809-3815页

作者：赵广迪臧喜民赵卓辽宁科技大学辽宁鞍山114051

采用高温激光共聚焦显微镜(HT-CLSM)和差热分析(DTA)研究了U720Li镍基高温合金的熔化和凝固行为。HT-CLSM熔化过程原位观察表明,升温至1122℃时在部分(γ+γ′)共晶颗粒前沿发生了初熔,但温度超过1173℃时该熔池才开始迅速扩大;升温至1... 详细信息

采用高温激光共聚焦显微镜(HT-CLSM)和差热分析(DTA)研究了U720Li镍基高温合金的熔化和凝固行为。HT-CLSM熔化过程原位观察表明,升温至1122℃时在部分(γ+γ′)共晶颗粒前沿发生了初熔,但温度超过1173℃时该熔池才开始迅速扩大;升温至1195℃时枝晶干处开始出现离散的斑点状熔池,且该熔池随温度的升高缓慢扩大;升温至1235℃时(γ+γ′)共晶开始熔化且随温度的升高该熔池向枝晶干迅速扩展,最终在1333℃枝晶完全熔化。HT-CLSM凝固过程原位观察表明,降温至1315℃时熔体开始形核凝固,并在1180℃左右凝固结束;固相转化速率随温度的降低先缓慢增加,再迅速增加到最大值,然后迅速降低并在凝固后期基本为零。DTA分析表明,铸锭中γ′相开始发生溶解的温度约为1047℃,铸锭完全熔化的温度约为1362℃。将HT-CLSM原位观察结果与前期的DTA分析结果进行对比,发现前者的测试结果较后者低30℃左右。

关键词：镍基高温合金熔化凝固高温激光共聚焦显微镜原位观察

Effect of hyperbaric oxygen preconditioning on the expression of aquaporin 5 in rats *** high-altitude pulmonary edema

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中华航海医学与高气压医学杂志 2012年第5期19卷 257-262页

作者： LI zhuo zhao Li-ming WANG Cong LIU Xue-hua GAO Chun-jin Department ofHyperbaric Oxygen Beifing Chaoyang Hospital Capital Medical University Beifing 100020China

Objective To investigate the possibility of applying hyperbaric oxygen preconditioning(HBO-PC)to reduce or prevent high-altitude pulmonary edema(HAPE)and to detect whether aquaporin 5(AQP5)are involved in HAPE *** Thirty eight rats were divided into three groups:the control,the HBO-PC and the HAPE *** blot and real-time PCR were used to analyze the expression of AQP5 in the *** wet-to-dry weight ratio(W/D weight ratio)and morphology of the lung were also *** Lung W/D weight ratio in the HAPE group(4.36±0.53)compared with that of the control group(3.90±0.15)(P＜0.05),were marked interstitial edema in all the lung sections in the HAPE group,and fewer changes in 10 of 13 sections in the HBO-PC ***-injury scores of the HBO-PC group were much lower than those of the HAPE ***5 of the HAPE group decreased significantly at the protein and gene levels compared with those in the control group(P＜0.01,P＜0.05).Protein and mRNA expression of AQP5 in the HBO-PC group were much higher than those of the HAPE group(P＜0.05,P＜0.01).Lung injuries in the HAPE rats were related positively to the AQP5 expression in the lung(protein expression r=-0.635,P＜0.01;mRNA expression r=-0.399,P＜0.05).Conclusions We concluded that HBO-PC could alleviate lung injury in rats caused by high-altitude hypobaric hypoxia and reduce HAPE *** in rats was associated with the down-regulation of expression of AQP5 in the *** down-egulation could be attenuated by *** study is the first one introducing HBO-PC in the prevention of HAPE,and the first investigation on the expression of AQP5 in a rat model of HAPE.

关键词：摘要编辑部编辑工作读者

砾石覆盖下土壤侵蚀过程中有机碳转移数量特征

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高原农业 2024年第2期8卷 181-187页

作者：梁万栋王小姣高志康田方霄赵卓喻武西藏农牧学院资源与环境学院西藏林芝860000

青藏高原对气候变化响应敏感,且具有提前的征兆,由于全球变暖的原因,冻土的融化会使冻土中所含的碳化合物以温室气体的形式排到大气中,从而进一步加剧全球变暖,本研究利用野外实地调查和采挖土壤侵蚀区的土壤到室内实验室采用模拟径流... 详细信息

青藏高原对气候变化响应敏感,且具有提前的征兆,由于全球变暖的原因,冻土的融化会使冻土中所含的碳化合物以温室气体的形式排到大气中,从而进一步加剧全球变暖,本研究利用野外实地调查和采挖土壤侵蚀区的土壤到室内实验室采用模拟径流冲刷法对土壤进行实验,主要得到:(1)当坡面土壤无砾石覆盖时,随着坡度的增加,有机碳的流失量也随之增加;(2)相比没有砾石覆盖的坡面土壤,砾石覆盖度为40%和70%时的土壤有机碳流失量显著大于裸坡的有机碳流失量;(3)随着砾石覆盖度的增加,砾石体积对土壤的破坏力增强,最终使有机碳失去物理保护而迁移流失,造成土壤有机碳流失量增加。由以上结论得出,在今后的裸坡地带进行水土流失预防和治理时应注重削减坡度的方式来减缓土壤侵蚀的发生和有机碳的流失。

关键词：砾石覆盖土壤侵蚀有机碳流失

Edge-guided heart-shaped skyrmion

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Rare Metals 2022年第3期41卷 865-870页

作者： Chun-Lei Zhang Jia-Ning Wang Cheng-Kun Song Nasir Mehmood zhao-zhuo Zeng Yun-Xu Ma Jian-Bo Wang Qing-Fang Liu Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou UniversityLanzhou 730000China Key Laboratory for Special Function Materials and Structural Design of the Ministry of the Education Lanzhou UniversityLanzhou 730000China

Magnetic skyrmion, which is a kind of swirl-like topological protected spin structure, shows great potential in the racetrack memory. So far, this progress is in obstacle by the skyrmion Hall effect which means that t... 详细信息

关键词： shaped topological obstacle

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混流式机组顶盖座环把合螺栓失效分析

水电与抽水蓄能 2024年第3期10卷 74-80页

作者：李文波胡钰婧赵倬黄蓉莫剑王辉斌沈丁杰赵强张军邹谨成国网湖南省电力有限公司电力科学研究院湖南省长沙市410000 国网湖南省电力有限公司水电分公司湖南省长沙市410000 湖南省湘电试验研究院湖南省长沙市410000 国网湖南省电力有限公司湖南省长沙市410000 国网新源控股有限公司抽水蓄能技术经济研究院北京市100000

混流式水轮发电机组顶盖座环把合螺栓是紧固座环和顶盖的重要部件。本文通过对顶盖座环把合螺栓的制造质量、安装质量进行检测与分析,阐明了某混流式水电厂水轮发电机组顶盖座环把合螺栓断裂故障的原因:①螺栓质量不合格,螺栓本体结构... 详细信息

混流式水轮发电机组顶盖座环把合螺栓是紧固座环和顶盖的重要部件。本文通过对顶盖座环把合螺栓的制造质量、安装质量进行检测与分析,阐明了某混流式水电厂水轮发电机组顶盖座环把合螺栓断裂故障的原因:①螺栓质量不合格,螺栓本体结构形式设计不合理,螺栓显微组织中存在网状铁素体,力学性能不合格;②螺栓安装预紧力不足,顶盖座环把合螺栓安装伸长值低于设计要求,导致螺栓在机组运行中可能松动;③机组振动超标严重,在螺栓服役过程外加载荷造成螺栓松动。

关键词：顶盖螺栓预紧力振动断裂

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Repurposing disulfiram with CuET nanocrystals:Enhancing anti-pyroptotic effect through NLRP3 inflammasome inhibition for treating inflammatory bowel diseases

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Acta Pharmaceutica Sinica B 2024年第6期14卷 2698-2715页

作者： Xueming Xu Yuanfeng Han Jiali Deng Shengfeng Wang Shijie zhuo Kai zhao Wenhu Zhou Hematology and Department of Critical Care Medicine The Third Xiangya HospitalCentral South UniversityChangsha 410013China Xiangya School of Pharmaceutical Sciences Central South UniversityChangsha 410013China Hunan Chidren's Hospital Changsha 410007China Department of Pharmacy The Third Xiangya HospitalCentral South UniversityChangsha 410013China Key Laboratory of Biological Nanotechnology of National Health Commission Changsha 410008China

Drug repurposing offers a valuable strategy for identifying new therapeutic applications for existing ***,disulfiram(DSF),a drug primarily used for alcohol addiction treatment,has emerged as a potential treatment for inflammatory diseases by inhibiting pyroptosis,a form of programmed cell *** therapeutic activity of DSF can be further enhanced by the presence of Cu^(2+),although the underlying mechanism of this enhancement remains *** this study,we investigated the mechanistic basis of Cu^(2+)-induced enhancement and discovered that it is attributed to the formation of a novel copper ethylthiocarbamate(CuET)*** exhibited significantly stronger anti-pyroptotic activity compared to DSF and employed a distinct mechanism of ***,despite its potent activity,CuET suffered from poor solubility and limited permeability,as revealed by our druggability *** overcome these intrinsic limitations,we developed a scalable method to prepare CuET nanocrystals(CuET NCs)using a metal coordination-driven self-assembly *** studies demonstrated that CuET NCs exhibited a 6-fold improvement in ***,CuET NCs exhibited high biodistribution in the intestine,suggesting their potential application for the treatment of inflammatory bowel diseases(IBDs).To evaluate their therapeutic efficacy in vivo,we employed a murine model of DSS-induced colitis and observed that CuET NCs effectively attenuated inflammation and ameliorated colitis *** findings highlight the discovery of CuET as a potent anti-pyroptotic agent,and the development of CuET NCs represents a novel approach to enhance the druggability of CuET.

关键词： Drug repurposing Pyroptosis Nanoparticles Bioavailability Disulfiram DSS-induced colitis NLRP3 inflammasome CuET

Enhanced high-temperature mechanical properties of laser-arc hybrid additive manufacturing of Al-Zn-Mg-Cu alloy via microstructure control

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Journal of Materials Science & Technology 2024年第2期169卷 220-234页

作者： Dehua Liu Dongjiang Wu Yunsong Wang zhuo Chen Changrong Ge Qingyu zhao Fangyong Niu Guangyi Ma State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian 116024China

Recently,rapid and cost-effective additive manufacturing solutions for lightweight aluminum alloys with excellent high-temperature mechanical properties have been increasingly in *** this study,we combined laser-arc hybrid additive manufacturing with solution and artificial aging treatments to achieve Al-Zn-Mg-Cu alloy with favorable high-temperature strength via microstructure *** pores became the major defect in the as-deposited and heat-treated *** continuous distribution of eutectics with hard-brittle characteristics at the grain boundaries was destructed following heat ***-densityηprecipitates were uniformly dispersed in the heat-treated Al-Zn-Mg-Cu alloy,whereas appeared coarsened and dissolved at 473 K,owing to the rapid diffusion of Zn and *** average 0.2%yield strength(318±16 MPa)and ultimate tensile strength(362±20 MPa)at 473 K af-ter heat treatment were enhanced by approximately 58%and 51%,respectively,compared to those of the as-deposited *** addition,theηprecipitates contributed to lattice distortions and strain fields,which prevented dislocation motion and increased slip deformation resistance at high *** as-deposited specimen exhibited intergranular fracture at 473 K,with cracks preferring to propagate along the aggregated ***,crack propagation proceeded in the sections with more pores in the heat-treated *** approach may provide a valid option for achieving alu-minum alloys with excellent high-temperature mechanical properties.

关键词： Laser-arc hybrid additive manufacturing Al-Zn-Mg-Cu alloy High-temperature strength Heat treatment,Microstructure evolution