Acta Chimica Sinica
Passive film formed on 304 stainless steel in 2.5 mol/L H2SO4 solution by using alternating voltage (A. V.) passivation have been investigated by measuring capacitance and photoelectrochemical parameters. The investigation of the effect of measure frequency on the slope of Mott-Schottky curve has been carried out. The photoelectrochemical measurements were consistent with the capacitance measurement. Analysis of the experimental results showed that the passive film formed 304 stainless steel by using A. V. passivation exhibits semiconducting properties. Using the simple model of semiconductor rather than the multi-donor level model can explain satisfactorily the semiconducting behavior of the film formed on 304 stainless steel by using A.V. passivation.
关键词:
A. V. passivation;passive film;semiconducting properties;stainless;steel;model;electrodes
Fatigue & Fracture of Engineering Materials & Structures
Fatigue data for welded joints subjected to an explosion treatment (ET) were obtained using rotary bending fatigue specimens. The fatigue fracture surfaces were observed by SEM and the dislocation morphologies by TEM. Mechanical properties have been quantitively studied by considering elastic and plastic shock wave characteristics. The test results indicate that the fatigue strength of welded joints subjected to ET is apparently improved due to the action of elastic or plastic stress waves while the ductility of the welded joints, i.e., reduction in area, is greatly increased.
关键词:
潘从锦
,
刘振中
,
郭守祥
,
郭宏银
涂料工业
介绍了HTEE-E型红外辐射涂料工作原理及其在丙烷脱沥青装置导热油炉上的使用情况.喷涂HTEE-E型红外辐射涂料后,导热油炉炉膛温度降低24℃,烟气温度降低17℃,辐射室外表面温度降低30℃.燃料气单耗降低1.6 kg/t,较之使用前节能5％,经济效益达到12.4万元/a.表明HTEE-E型红外辐射涂料应用在导热油炉上能够提高热量利用率,达到节能的效果.
关键词:
红外辐射涂料
,
导热油炉
,
节能
黎学明
,
龙海平
,
杨建春
,
高放
,
杨文静
,
孔令峰
材料导报
以香草醛为原料,在乙醇介质中与1,3-二溴丙烷反应生成1,3-二(4-甲酰-2-甲氧基苯氧基)丙烷,然后在甲醇介质中进行硼氢化还原,最后在甲酸介质中聚合,合成笼形超分子主体化合物Cryptophane E.采用核磁共振谱(1H NMR、13C NMR)、质谱(MS)、紫外光谱(UV)荧光光谱、红外光谱、元素分析等测试技术对Cryptophane E进行表征,重点考察反应温度、时间及原料配比等因素对合成产率的影响,获得最佳反应条件,并深入探讨了合成机理.
关键词:
Cryptophane
,
E
,
超分子材料
,
合成
,
表征
魏芸
,
张天佑
,
吴克友
色谱
doi:10.3321/j.issn:1000-8713.2002.06.013
采用高速逆流色谱法分离纯化刺五加粗品中的刺五加苷E.溶剂系统为氯仿-甲醇-异丙醇-水,体积比为5∶6∶1∶4,上相为固定相,下相为流动相,转速为800 r/min,流速为2.0 mL/min.所得刺五加苷E经高效液相色谱分析,测定纯度为98%(峰面积百分比).这为其他苷类等极性物质的分离纯化提供了依据.
关键词:
高速逆流色谱法
,
分离
,
制备
,
刺五加苷
,
刺五加
贾昌春
,
A.Lahmam-Bennani
,
A.Duguet
,
L.Avaldi
,
M.Lecas
,
Dal Cappello
原子核物理评论
doi:10.3969/j.issn.1007-4627.2002.z1.007
通过Ar(e, 3e)五重微分截面3维图的理论与实验比较发现, 在低能电子入射的情况下, 理论与实验存在较大的偏差.
关键词:
(e,3e)
,
双电离
,
五重微分截面
王涛峰
,
朱丽萍
,
孟庆华
,
王黎明
,
韩洪银
,
夏海鸿
,
黎光武
,
屈从会
,
顾先宝
原子核物理评论
doi:10.3969/j.issn.1007-4627.2007.03.008
研制了屏栅电离室+△E-E望远镜探测器系统,系统的屏栅电离室用来测定252Cf自发裂变碎片的能量和相对于探测器系统轴线的发射角,与屏栅电离室耦合安装的△E-E望远镜探测器由一个薄的屏栅电离室(气体△E)和一个金硅面垒探测器(E)组成,用来确定互补碎片的电荷.用本系统对252Cf自发裂变碎片电荷分布进行了4个参数的关联测量,结果表明,这个探测器系统的电荷分辨能力Z/△Z好于40:1.
关键词:
屏栅电离室
,
△E-E望远镜
,
电荷分辨能力
