检索结果-南通市图书馆

Synthesis,Characterization and Thermal Property of the Aluminum Boroxine-linked Compound with N-aryl Substituted β-Diketiminato ligand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2015年第5期34卷 729-734页

作者： HAO Peng-Fei YANG Jun-Juan YANG Zhi ma xiao-li YANG Ying li Jia-Rong School of Chemical Engineering and Environment Beijing Institute of Technology School of Chemistry and Chemical Engineering Central South University

The boroxine-linked organic aluminum compound LAl[OB（3-C4H3O）]2（μ-O） was accomplished by reacting LAl H2 {L =（Z）-4-[（2,6-diisopropylphenyl）amino]pent-3-en-2-ylidene-2,6-diisopropylaniline} with furan-3-ylboronic acid in good *** title compound belongs to the orthorhombic system,space group Pnma with a = 10.9774（15）,b = 19.369（3）,c = 17.362（3） A,V = 3691.5（9） A^3,C37H47 Al B2N2O5,Mr = 648.37,Z = 4,Dc = 1.167 Mg/m^3,μ（Mo Kα） = 0.097 mm^–1,F（000） = 1384,S = 1.000,the final R = 0.0589 and w R = 0.1445 for 9138 observed reflections（I 〉 2σ（I）） and R = 0.0683 and w R = 0.1517 for all *** compound is an unique example of a spiro-centered aluminum atom,showing the inorganic Al O3B2 ring fused to the organic C3N2 *** was characterized by 1H NMR,IR,elemental analysis,and single-crystal X-ray structural ***,the compound was studied by TG analysis as well as DSC.

关键词： β-diketiminato ligand boroxine-linked aluminum compound thermal property

A New Route for Identification of Precipitates on Austenite Grain Boundary in an Nb-V-Ti Microalloyed Steel

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第8期18卷 53-57页

作者： SHA Qing-yun HUANG Guo-jian GUAN Ju ma xiao-jun li Da-hang Technology Center Angang Steel Company Limited Anshan 114009 Liaoning China

The precipitates on austenite grain boundaries in an Nb-V-Ti microalloyed steel have been investigated by transmission electron microscope （TEM） examination of carbon extraction replica. The replica was prepared from specimen etched with saturated picric solution rather than Nital which is conventionally used. Then particles on both grain boundaries and triple point of grain [aoundaries were clearly observed and identified as （Nb,Ti）（C, N） parti- cles. In case of conventional way, it is difficult to determine the location of particles with respect to austenite grain boundaries. The number of particles observed in new way developed was greatly reduced compared with that found in replica prepared by the conventional way, which may be caused by the dissolution of partial precipitates during the etching with longer time and at higher temperature involved in new way. Despite this, the new way developed pro- vides an effective way to determine the precipitate particles on austenite urain boundaries_

关键词： precipitate austenite grain boundary replica etch

Orientation controlled preparation of nanoporous carbon nitride fibers and related composite for gas sensing under ambient conditions

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第5期10卷 1710-1719页

作者： Suqin li Zhiwei Wang xiaoshan Wang Fangfang Sun Kai Gao Ningxian Hao Zhipeng Zhang Zhongyuan ma Hai li xiao Huang Wei Huang Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced materials (IAM) Jiangsu National Synergistic Innovation Centerfor Advanced Materials (SICAM) Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China

Creating pores in suprastructures of two-dimensional （2D） materials while controlling the orientation of the 2D building blocks is important in achieving large specific surface areas and tuning the anisotropic properties of the obtained functional hierarchical structures. In this contribution, we report that arranging graphitic carbon nitride （g-C3N4） nanosheets into one-dimensional （1D） architectures with controlled orientation has been achieved by using 1D oriented melem hydrate fibers as the synthetic precursor via a polycondensation process, during which the removal of water molecules and release of ammonia gas led to the creation of pores without destroying the 1D morphology of the oriented structures. The resulting porous g-C3N4 fibers with both meso- and micro-sized pores and largely exposed edges exhibited good sensing sensitivity and selectivity towards NO2. The sensing performance was further improved by hybridization of the porous fibers with Au nanoparticles （Au NPs）, leading to a detection limit of 60 ppb under ambient conditions. Our results suggest that the highly porous g-C3N4 fibers and the related hybrid structures with largely exposed graphitic layer edges are excellent sensing platforms and may also show promise in other electronic and electrochemical applications.

关键词： graphitic carbon nitride Au nanoparticle gas sensing porous fiber chemiresistive sensor

Ginsenoside Rk1 suppresses pro-inflammatory responses in lipopolysaccharide-stimulated RAW264.7 cells by inhibiting the Jak2/Stat3 pathway

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 Natural Medicines 2017年第10期15卷 751-757页

作者： YU Qian ZENG Ke-Wu ma xiao-li JIANG Yong TU Peng-Fei WANG Xue-Mei Research Studio of Integration of Traditional and Western Medicine First HospitalPeking UniversityBeijing 100034China State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical SciencesPeking UniversityBeijing 100191China

The saponin ginsenoside Rk1 is a major compound isolated from *** Rk1 has been reported to have anti-inflammatory and anti-tumor properties and to be involved in the regulation of ***,the effect and mechanism of anti-inflammatory action of ginsenoside Rk1 has not been fully *** investigated whether ginsenoside Rk1 could suppress the inflammatory response in lipopolysaccharide-stimulated RAW264.7 macrophages and to explore its mechanism of the ***264.7 cells were treated with LPS(1 μg×mL^(–1))in the absence or the presence of Ginsenoside Rk1(10,20,and 40 μmol×L^(–1)).Then the inflammatory factors were tested with Griess reagents,EliSA,and *** proteins were analyzed by Western *** Rk1 inhibited lipopolysaccharide-induced expression of nitric oxide(NO),interleukin(IL)-6,IL-1β,tumor necrosis factor(TNF)-α,and monocyte chemotactic protein(MCP)-*** Rk1 inhibited the lipopolysaccharide-stimulated phosphorylation of NF-κB and janus kinase(Jak)2 and signal transducer and activator of transcription(Stat)3 at Ser727 and *** data suggested that ginsenoside Rk1 could inhibit expression of inflammatory mediators and suppress inflammation further by blocking activation of NF-κB and the Jak2/Stat3 pathway in LPS-stimulated RAW264.7 cells.

关键词： Inflammation RAW264.7 cells Ginsenoside Rkl Jak2/Stat3 NF-xB

A child with pulmonary and liver Langerhans＇-cell histiocytosis

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2012年第9期125卷 1675-1676页

作者： ma xiao-li SHEN Kun-ling WANG Bin Hematology Center Beijing Children's Hospital Affiliated to Capital Medical UniversityBeijing 100045China

Clinical categories of Langerhans cell histiocytosis （LCH） include single and multi-system disease. Pulmonary LCH is rare, which is an unusual interstitial lung disease with the characteristics of monoclonal proliferation and infiltration of Langerhans＇ cells to organs. We report our experience of a rare LCH case of multiple organs such as pulmonary and liver as the main clinical manifestation. The patient was treated with chemotherapy which included prednisone, vinblastine, methotrexate and 6-mercaptopurine for 52 weeks and follow up all along. The patient has a favorable clinical outcome.

关键词： Langerhans '-cell histiocytosis pulmonary liver child

The Writing of Body in The House of Mirth

在线全文

学校读者我要写书评

暂无评论

Journal of literature and Art Studies 2023年第10期13卷 744-750页

作者： ma xiao-li YING Zhen-yi School of International Studies Zhejiang UniversityHangzhouChina

Historical studies on the character of lily Bart in Edith Wharton’s The House of Mirth have predominantly revolved around psychology,sociology,and aesthetics,yet neglecting the significance and role of the body within the *** Brooks’s concept of body writing,this paper focuses on exploring lily’s body in three dimensions:the body of vision(self-objectification);the body of privacy(moral dilemma);and the body of modernity(overdose symbolizing the clash of science and humanity).Scrutinizing and analyzing the body writing in The House of Mirth reveal the feminist undercurrents of lily’s character and highlight the broader and significant role of body writing in literary works.

关键词： body writing lily Bart The House of Mirth feminism

The Cultural Values of Tea in Virginia Woolf＇s The Years

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 literature and Art Studies 2017年第12期7卷 1580-1586页

作者： ma xiao-li WANG Ya-xuan School of International Studies Zhejiang University Hangzhou China Carlson School of management University of Minnesota Twin Cities U.S.A.

The paper probes into the connotations of tea in Virginia Woolt＇s The Years, showing historical changes of the relationship between women and tea. On the basis of the female characters＇ attitude and their understanding of tea, the tea values shed light on the culturally feminine roles, identity, social identity changes and family position in the Victorian Era and the New Era.

关键词： Virginia Woolf The Years tea culture women

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

壳聚糖固定化脲酶活性的X射线微区分析

光谱学与光谱分析 2005年第3期25卷 456-459页

作者：马晓莉姚子华河北大学化学与环境科学学院

利用X射线微区分析方法 ,对壳聚糖固定化脲酶活性进行了定位分析。筛选出了能捕捉固定化脲酶活性部位的捕捉剂BaCl2 ,以尿素作为底物 ,在Tris HCl缓冲溶液中 ,底物经固定化脲酶催化产生NH3 和CO2 ,后者和捕捉剂反应生成BaCO3 沉淀 ,沉... 详细信息

利用X射线微区分析方法 ,对壳聚糖固定化脲酶活性进行了定位分析。筛选出了能捕捉固定化脲酶活性部位的捕捉剂BaCl2 ,以尿素作为底物 ,在Tris HCl缓冲溶液中 ,底物经固定化脲酶催化产生NH3 和CO2 ,后者和捕捉剂反应生成BaCO3 沉淀 ,沉积在固定化脲酶的催化活性部位 ,借此确定其催化活性部位。结果表明BaCl2 可用做固定化脲酶活性定位的捕捉剂。同时得到了壳聚糖固定化脲酶活性定位的最佳实验条件。

关键词：脲酶活性捕捉部位壳聚糖利用筛选尿素 X射线微区分析底物固定化

含α-二亚胺配体的硅(Ⅳ)配合物的合成、晶体结构与性能研究(英文)

在线全文

学校读者我要写书评

暂无评论

无机化学学报 2013年第6期29卷 1295-1301页

作者：马小莉孙帅杨鹰北京理工大学化工与环境学院北京100081 中南大学化学与化工学学院长沙410083

利用金属单质还原的方法合成了不同取代基的α-二亚胺配体支持的2个硅(Ⅳ)配合物L(SiMe3)2(2)(L=[(2,6-iPr2C6H3)NC(Me)]2)和L′(SiMe3)2(4)(L′=[(2,6-iPr2C6H3)NCH]2)。通过X-射线单晶衍射测定了配合物的单晶结构,并对其进行了元素分... 详细信息

利用金属单质还原的方法合成了不同取代基的α-二亚胺配体支持的2个硅(Ⅳ)配合物L(SiMe3)2(2)(L=[(2,6-iPr2C6H3)NC(Me)]2)和L′(SiMe3)2(4)(L′=[(2,6-iPr2C6H3)NCH]2)。通过X-射线单晶衍射测定了配合物的单晶结构,并对其进行了元素分析、1HNMR、红外光谱表征,以及紫外-可见光谱和荧光光谱分析。结构分析表明,构成这2种化合物中心的NCCN骨架呈之字形分布,骨架上三取代的原子接近平面排布。2种硅配合物在紫外光激发下都具有较好的发光性质。

关键词： α-二亚胺晶体结构硅髧配合物光致发光