检索结果-南通市图书馆

Effects of Al on microstructural stability and related stress-rupture properties of a third-generation single crystal superalloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第11期35卷 2537-2542页

作者： Jingxia Sun Jinlai liu Lirong liu Yizhou Zhou Jinguo lia Xiaofeng Sun Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Space Manufacturing Technology Key Lab Chinese Academy of SciencesBeijing 100094China

To examine the influences of minor modification of Al content on the microstructural stabilities and stress rupture properties,two alloys with minor difference in Al content were exposed isothermally at 1100℃for 100 h,500 h,and 1000 h,*** microstructures were characterized before and after thermal *** was found that when Al content was decreased by 0.4 wt%,the volume fractionγ'decreased by 4%,the size ofγ'increased by 40 nm,the matrix channel width increased by 5 nm,and the misfit degree ofγ/γ'phases increased by 0.006%after heat treatment(HT).During thermal exposure,the alloy with low Al content had a better resistance to coarsening ofγ'phase and precipitation ofμ***γ'particles of the alloy with high AI content tended to connect each other and coarsened alongdirections;however,theγ'particles of the alloy with low Al content remained cubic after 500 h.A serious coarsening behavior took place in the two alloys after aging for 1000 *** structural stabilities were significantly ***,the change of 0.4 wt%Al content was found to have little effect on the high temperature stress-rupture properties.

关键词： Ni base single crystal superalloys Thermal exposure Microstructural stability Stress-rupture property Al

Synthesis　and　Characterization　of　Thermotropic　Liquid　Crystalline　Complexes　Containing　Ferrocenyl　group

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1996年第11期7卷 1039-1040页

作者： liu, ZM lian, W Shi, HX Niu, T lia, XS NEIMENggU UNIV DEPT CHEMHOHHOT 010021PEOPLES R CHINA

Four ferrocenyl long -chain alkyl β-diketonato zinc(Ⅱ) complexes with a general formulaZnL2 (L = C5H5FeC5an COCH COCnH2n+1.n= 6 - 9) were synthesized. These complexes were characterizedby elementary analysis, IR 1HNMR MS. polarizing microscopy with a heating stage and DSC. It wasfound that the complexes have thermotropic liquid crystalline properties. The type of the heteronuclearliquid crystalline metal complexes have not been reported so far.

关键词： Thermotropic Liquid and Complexes Characterization

Quantitative analysis of FRET assay in biology New developments in protein interaction affinity and protease kinetics determinations in the SUMOylation cascade

在线全文

学校读者我要写书评

暂无评论

Frontiers in Biology 2012年第1期7卷 57-64页

作者： Yan liu Yang SONg Ling JIANg Jiayu lia Department of Bioengineering Bourns College of Engineering University of California at Riverside 900 University Avenue Riverside CA92521 USA

Forster resonance energy transfer （FRET） techniques have been widely used in biological studies in vitro andin vivo and are powerful tools for elucidating protein interactions in many regulatory cascades. FRET occurs between oscillating dipoles of two fluorophores with overlapping emission and excitation wavelengths and is dependent on the spectroscopic and geometric properties of the donor-acceptor pair. Various efforts have been made to develop quantitative FRET methods to accurately determine the interaction affinity and kinetics parameters. SUMOylation is an important post-translational protein modification with key roles in multiple biological processes. Conjugating SUMO to substrates requires an enzymatic cascade. Sentrin/SUMO-specific proteases （SENP） act as endopeptidases to process the pre-SUMO or an isopeptidase to deconjugate SUMO from its substrate. Here we also summarize recent developments of theoretical and experimental procedures for determining the protein interaction dissociation constant, Kd, and protease kinetics parameters, kcat and Kin, in the SUMOylation pathway. The general principles of these quantitative FRET-based measurements can be applied to other protein interactions and proteases.

关键词： quantitative FRET analysis protein affinity determination kinetics analysis

Pt Complexes with High Molecular Weight Polyvinylmethyldimethylsiloxane Ligands Supported on Diatomite for Liquid-phase Hydrosilylation of 3, 3, 3-Trifluoropropene with Methyldichlorosilane

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第6期17卷 803-806页

作者： Hong liu lia0 Huai Jun ZHU Feng Yi LI College of Chemical and Energy South China University of Technology Guangzhou 510640 Chemistry Department of Nanchang University Nanchang 330047

Pt complexes with high molecular weight polyvinylmethyldimethylsiloxane （HMPVMS） ligands supported on diatomite as a catalyst for the hydrosilylation of 3, 3, 3-trifluoropropene and methyldichlorosilane. Results show that this catalyst displays good thermal stability, high activity and excellent recyclability, and it can be readily fabricated by a simple process.

关键词： Pt hydmsilylation high molecular weight polyvinylmethyldimethylsiloxane.

Optimization and evaluation of fish oil rnicrocapsules

在线全文

学校读者我要写书评

暂无评论

Particuology 2016年第6期14卷 162-168页

作者： Hui liu lia nyan Wang Tingyuan Yang guifeng Zhang Jian Huang Jing Sun Junsheng Huo Division of Food Science & Technology National Institute for Nutrition and Health Chinese Center for Disease Control and Prevention Beijing 100050China National Key Lab of Biochemical Engineering Institute of Process Engineering Chinese Academy of Science Beifing 100190 China

Fish oil microcapsules were prepared using two natural polysaccharides, alginate and chitosan, as the wall materials. A response surface methodology （RSM） was used to optimize the conditions for fish oil encapsulation efficiency （FOEE）. The FOEE was investigated with respect to three key-variables in the RSM： ratio of inner oil phase to aqueous phase （X1 w/w）; concentration of the aqueous phase （X2, wt%）; and ratio of the aqueous phase to outer oil phase （X3, v/v）. The optimal formulation obtained from the RSM model, i.e., 2.7：1 （X1）, 1.6 wt% （X2）, and 11.5：1 （X3）, gave a FOEE of 28%. The model was validated and the fish oil microcapsules prepared under the optimized conditions were characterized in terms of particle size, polydispersity index （PDI）, zeta potential, surface morphology, and in vitro release. The average droplet size, PDI, and zeta potential were 915 nm, 0.038, and ＋5.2 mV, respectively. The fish oil microcapsules were highly uniform microspheres, and had an accumulative release rate of 77.7% in 270 min in a gastrointestinal model, indicating their potential as an alternative carrier for the controlled release of fish oil. In conclusion, formulating optimal microencapsulation conditions by the RSM can be applied to the microencapsulation of various oil-soluble nutrients for food applications.

关键词： Optimization Microencapsulation Fish oil Evaluation Response surface methodology

A FUNCTIONAL CONJUgATED HYPERBRANCHED POLYMER DERIVED FROM TETRAPHENYLETHENE AND OXADIAZOLE MOIETIES:SYNTHESIS BY ONE-POT “A_4+B_2+C_2” POLYMERIZATION AND APPLICAION AS EXPLOSIVE CHEMOSENSOR AND PLED

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2013年第10期31卷 1432-1442页

作者： Wen-bo Wu Shang-hui Ye Li-jin Huang gui Yu Yun-qi liu Jin-gui Qin Zhen lia Department of Chemistry Hubei Key Lab on Organic and Polymeric Opto-Electronic MaterialsWuhan University Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences

A new conjugated hyperbranched polymer （hb-TFO） containing tetraphenylethylene （TPE） units, a famous aggregation-induced emission （AIE） active group, as the core, was synthesized successfully with modest yield via one-pot Suzuki polymerization reaction. Thanks to the introduction of TPE moieties, hb-TFO exhibited aggregation-enhanced emission （AEE） property, and could work as explosive chemosensor with high sensitivity. The polymeric light-emitting diode （PLED） device was fabricated to investigate its electroluminescent property, and hb-TFO demonstrated a maximum luminance efficiency of 0.22 cd/A and a maximum brightness of 545 cd/m2 at 15.9 V.

关键词： Hyperbranched polymer AEE TPE Explosive chemosensor PLED.

过去千年东亚与全球百年尺度温度同步性变化的模拟研究

在线全文

学校读者我要写书评

暂无评论

第四纪研究 2024年第2期44卷 579-592页

作者：刘雅雯严蜜刘健宁亮南京师范大学虚拟地理环境教育部重点试验室/江苏省地理环境演化国家重点试验室培育建设点/江苏省地理信息资源开发与利用协同创新中心南京师范大学地理科学学院江苏南京210023 崂山实验室山东青岛266061 江苏省大规模复杂系统数值模拟重点试验室南京师范大学数学科学学院江苏南京210023

利用美国国家大气研究中心(NCAR)提供的过去千年(850~2005年)集合模拟试验(CESM-LME)资料,在与重建资料、现代观测/再分析资料进行对比验证的基础上,分析了过去千年不同世纪东亚与全球地表温度变化的同步性,并结合单因子敏感性试验结果... 详细信息

利用美国国家大气研究中心(NCAR)提供的过去千年(850~2005年)集合模拟试验(CESM-LME)资料,在与重建资料、现代观测/再分析资料进行对比验证的基础上,分析了过去千年不同世纪东亚与全球地表温度变化的同步性,并结合单因子敏感性试验结果,分析了造成东亚与全球地表温度各个世纪同步性及变化幅度差异的原因。结果表明:过去千年里,在20世纪以前,东亚地区与全球均经历了中世纪暖期与小冰期,温度变化在百年尺度上整体一致,10世纪、 11世纪、 13世纪、 18世纪和19世纪东亚与全球温度变化同步性较高,差异较小;但在12世纪、 14~17世纪中,其变化振幅存在显著差异,东亚地区温度变化幅度总体上小于全球,太阳辐射和火山活动等自然外强迫及内部变率对差异的形成可能起到了主导作用;而20世纪以来,两者变化显示出较大的不同步性,东亚地区温度增长没有全球温度增长剧烈,甚至出现了降温,人为外强迫在这一时期起主导作用。温室气体浓度变化对温度的影响在两极有明显的放大效应,是东亚与全球温度变化差异形成的主要原因,同时,人为气溶胶排放使得东亚地区温度降低也是东亚与全球温度变化不同步的原因之一。

关键词：温度变化过去千年模拟研究全球东亚地区同步性

The magic of integration:Exploring the construction of dithienylethene-based infinite coordination polymers and their synergistic effect for gaseous ammonia probe applications

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第4期27卷 518-522页

作者： Yan-Kai lia Jun-Ji Zhang Zi-Jun Bian You-Xin Fu Fei liu Chen-Hui Wang Xiang Ma Jun Hu Hong-Lai liu Key Laboratory for Advanced Materials and Department of Chemistry East China University of Science and Technology Key Laboratory for Advanced Materials and Institute of Fine Chemicals East China University of Science and Technology Xi’an Thermal Power Research Institute Co. Ltd. (Suzhou Branch)

Infinite coordination polymers are recognized as excellent platform for *** motifs,which are one of the most attractive functional moieties,were incorporated into an infinite coordination polymer,to deliver a‘‘smart’’porous material that can response to external *** obtained dithienylethene-based infinite coordination polymers（named Cu-DTEDBA）share the advantages of both infinite coordination polymers（porosity and stability）and dithienylethene motifs（photochromism）.The physical and chemical properties of Cu-DTEDBA were characterized by FTIR,TEM,SEM,XRD,TgA,UV–vis,EDX and ***,the combination of dithienylethene and infinite coordination polymers gives rise to a synergistic effect,which induces functional behaviors of ammonia sensor *** open and closed forms of Cu-DTEDBA exhibit distinct colorimetric change upon exposure to gaseous ammonia,which is not observed in dithienylethene free molecules.

关键词： Dithienylethene Photochromism Infinite coordination polymers Synergistic effect gaseous ammonia probe

Next-generation probiotic candidates targeting intestinal health in weaned piglets: Both live and heat-killed Akkermansia muciniphila prevent pathological changes induced by enterotoxigenic Escherichia coli in the gut

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2024年第02期17卷 110-122页

作者： Cong Lan Hua Li Yuqing Shen Yang liu Aimin Wu Jun He Jingyi Cai gang Tian Xiangbing Mao Zhiqing Huang Bing Yu Ping Zheng Jie Yu Junqiu Luo Hui Yan Yuheng Luo Key Laboratory for Animal Disease-Resistance Nutrition of Ministry of Education of China Key Laboratory for Animal Disease-Resistance Nutrition and Feed of Ministry of Agriculture of ChinaKey Laboratory of Animal Disease-Resistant Nutrition of Sichuan ProvinceEngineering Research Center of Animal Disease-Resistance Nutrition Biotechnology of Ministry of Education of ChinaAnimal Nutrition InstituteSichuan Agricultural University

The use of next-generation probiotics （NgP） in pigs for combating diseases has been subject to limited *** we explored the potential of a well-known NgP candidate Akkermansia muciniphila targeting pig gut *** the first screening experiment,we found that the abundance of *** peaked at 14 d old but decreased at weaning （21 d old;Pggesting the weaning period may be an effective window for *** *** that,48 crossbred weaned pigs at 28 d old were randomly assigned to five groups:control （CON）,high/low live *** （HA/LA）,and high/low heatkilled *** （HIA/lia）.From 1 to 28 d old,the CON group received gastric infusion of anaerobic sterile saline every other day;the HA and LA groups were gavaged every other day with 1×1010CFU/5 m L and 5×10～8CFU/5 mL live ***,respectively;and the HIA and lia.groups were gavaged every other day with 1×1010CFU/5 mL and 5×10～8CFU/5 mL heat-killed ***,*** d 29,pigs in the CON group were randomly and equally divided into two groups,one of which was named the enterotoxigenic Escherichia coli （ETEC） group,and all groups except CON received a 5-d ETEC *** supplementation of *** numerically reduced the diarrhea rate of weaned pigs compared to the pigs that only received the ETEC challenge （P=0.57）,but the lia.group had a higher diarrhea rate than the CON group （Pgy and structure,proportion of CD4+T lymphocytes in the blood,as well as the expression of genes related to intestinal barrier and antioxidant indices of pigs with ETEC challenge,especially for the LA group （Pgenes in the ileum and colon of pigs challenged by ETEC （Pglets from damage caused by

关键词： Akkermansia muciniphila Weaned piglet Enterotoxigenic Escherichia coli challenge Intestinal health