TANG Guoyi ZHENG Yangzeng Yanshan University
,
Qinhuangdao
,
ChinaCAI Qigong
,
ZHU Jing Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China TANG Guoyi
,
Dept.of Graduates
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing 100081
,
China
金属学报(英文版)
The effects of chemical composition and cooling rate after solidication on the grain coarsening temperature,T_(GC),of the V-Ti-N microalloyed steels have been investigated.It is shown that the T_(GC) may be obviously raised by adding even a little Ti to the base steel so as to pre- cipitate a great deal of fine Ti-bearing particles of about 10 nm.The T_(GC) does not increase with the cooling rate,as it is over a certain critical value.The T_(GC) is insensitive to any varia- tion of N content at simulated cooling condition of 150 mm continuous cast slab.The T_(GC) may be dropped down about 100℃ by adding 0.33 wt-%Mo to the steels.The sensitivi- ty of T_(GC) to cooling condition relates to the Ti and V contents.
关键词:
microalloyed steel
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null
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null
杨金瑞
,
余尚先
,
顾江楠
高分子材料科学与工程
通过对resol(羟甲基酚化合物和低分子量羟甲基酚树脂)DEPT135图谱的分析讨论,得到一系列计算resol微细结构参数的经验公式.根据DEPT135图谱可判断是否发生缩聚反应,根据经验公式可计算酚单体各个活性点参与反应百分率或酚羟基导入率、不同类型缩聚所占百分率及低分子量羟甲基酚树脂的平均核体数.
关键词:
羟甲基酚化合物
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羟甲基酚树脂
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DEPT135
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结构参数
WU Chuansong
,
CAO Zhenning
,
WU Lin Harbin Institute of Technology
,
Harbin
,
China
金属学报(英文版)
A model is established to analyze three-dimensional fluid flow and heat transfer in TICweld pools with full penetration.It considers the deformation of the molten pool surfaceat the condition of full penetrated workpieees,takes the are pressure as the drivingforce of the pool surface deformation,and determines the surface configuration of weldpool based on the dynamic balance of arc pressure,pool gravity and surface tension atdeformed weld pool surface. The SIMPLER algorithm is used to calculate the fluid flowfield and temperature distribution in TIG weld pools of stainless steel workpieces.TIGwelding experiments are made to verify the validity of the model.It shows the calculatedresults by the model are in good agreement with experimental measurements. professor,Dept of Welding Engineering,Harbin Institute of Technology,Harbin 150006,China
关键词:
KEY WORDS TIG weld pool
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null
,
null
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null
,
null
陈秋玲
,
谷俊杰
,
孙可伟
,
张春红
,
田森林
高分子材料科学与工程
采用有机溶剂萃取和柱层析相结合的方法,从麦秆液化混合液中,除得到大量降解多糖外,经分离提纯得到两种关键组分.利用核磁(1 H-NMR,13C-NMR,DEPT)、质谱(MS)和红外(IR)等方法,分析得出产物1是乙酰丙酸聚乙二醇酯,产物2含有2分子苯环,是含有愈创木基木质素和对羟基苯基木质素结构单元的酯类化合物.通过产物的波谱数据分析其结构,并结合液化过程中酸值、羟值及残渣的变化,推导出植物纤维中木质素和纤维素液化的反应机理.
关键词:
纤维素
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木质素
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液化
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机理
谭倪
,
邵长伦
,
陶李明
,
何丽仙
,
佘志刚
,
林永成
应用化学
doi:10.3969/j.issn.1000-0518.2009.03.007
通过人工发酵培养,利用层析技术,从南海红树林内源真菌#2240的培养液中分离得到3个蒽醌类次级代谢产物,它们分别是:(+)-3,3',7,7',8,8'-六羟基-5,5'-二甲基连二蒽醌(化合物1),1,4,5-三羟基-7-甲基蒽醌(化合物2)和1,6,8-三羟基-3-甲基蒽醌(化合物3),其中化合物1为新化合物. 它们的结构通过谱图分析(包括1H、13C NMR、DEPT、HMQC、HMBC、HREIMS、UV-Vis及IR等)和相关文献得以确定. 初步药理实验表明,化合物1对DNA拓扑异构酶(hTopo I)具有强抑制活性,最低抑制浓度2.35×10-4 mol/L,结果远低于阳性对照物喜树碱之值1.00×10-3 mol/L.
关键词:
红树林内源真菌
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蒽醌
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次级代谢产物
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DNA拓扑异构酶
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抑制活性
钱智勇
,
罗彦凤
,
傅亚
,
张徭尧
,
霍润兰
,
王远亮
功能材料
以马来酸酐和己二胺为原料制备出了一种新型的马来酰己二胺酸单体（HOOC-MAH-HDA-NH2）,然后采用自由基熔融接枝技术将HOOC-MAH-HDA-NH2引入到PDLLA骨架中,形成了结构与己二胺改性聚乳酸（HMPDLLA）相似的MHP-DLLA材料。采用红外光谱（FT-IR）、核磁共振氢谱（1 H NMR）、核磁共振碳谱（13 C NMR）和DEPT 135对HOOC-MAH-HDA-NH2和MHPDLLA的化学结构进行了定性和定量表征。以PDLLA为空白,HMP-DLLA为对照,对MHPDLLA的分子量进行了测定。结果表明采用新的合成工艺使聚合物的分子量从原有的66%～68%降低到了33%～34%,且合成路线更简单。在合成路线和合成工艺上的创新为MHPDLLA用作生物活性材料或仿生材料的基质材料开辟了更广阔的空间。
关键词:
聚(DL-乳酸)
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自由基接枝共聚
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马来酰己二胺酸
