S.H. Tantawi (Building Research Institute
,
Dokki
,
Cairo
,
Egypt)I.Z.Selim (Physical Chemistry Dept.
,
National Research Center
,
Dokki
,
Cairo
,
Egypt (To whom correspondence should be addressed)
材料科学技术（英文）
The use of a natural white juice, taken from magrabe banana stem, as concrete admixture to improve mechanical and physicrvchemical properties of concrete has been studied. The compressive strength, bulk density the free lime liberated during hydration and the combined water content were determined. The results indicate that the admixture acts as a retarder in most cases and as accelerator in some ones. Also, the admixture effect on the corrosion resistance of the reinforcing steel against surrounding aggressive media has been investigated using galvanostatic polarization technique. The addition of 0.2% admixture leads to the more inhibition of the steel
关键词:
S.A. Al-Aghbari and Z. W. Lu Ministry of Oil & Mineral Resources
,
Republic of Yemen Thermal-Engineering Department
,
Northeastern University
,
Shenyang 110006
,
China
金属学报(英文版)
A brief introduction to Arab countries, in respect of their locations, populations, areas and mineral resources, was given. The development of steel industry in Am6 countries in last two decades was staled as a whole. And the steel industries in Egypt, Qatar, Saudi Arabia, United Arch Emirates (UAE), Morocco, Libya, Joanal, Tunisia, Syria, Iraq, Algeria and Bahrain were analyzed separately. Some development problems faced by Arab steel industry, such as steel market, natural resources, manpower and finance, were pointed out.
关键词:
steel industry
,
null
,
null
钢铁
安装在埃及艾兹带钢公司(Ezz Flat Steel,Egypt)薄板坯连铸连轧厂的f2CR型轧机具有对带钢凸度和平直度进行非常广泛控制的能力,这一能力使得生产顶级质量超薄产品成为可能.
关键词:
带钢
,
控制
Solid State Communications
Quantum coherence effect on the conductance scaling law G similar to L(-theta) of a fractal nonbranching Koch curve is addressed. The quantum conductivity exponent theta of the fractal is exactly solved by combining the Landauer formula with a renormalization decimation transformation.
关键词:
F.H. Froes(IMAP
,
University of Idaho
,
Moscow
,
ID 838443026
,
USA Manuscript received 26 August 1996)
金属学报(英文版)
The synthesis, processing and mechanical properties of the light metals, aluminum,magnesium and titanium Produced by advanced techniques are reviewed. Synthesis techniques to be addressed will include rapid solidification, spray deposition, mechanical alloying, plasma Processing and vapor deposition.
关键词:
:synthesis/processing
,
null
,
null
,
null
,
null
,
null
,
null
,
null
,
null
,
null
,
null
Zhihua LIU
,
Qing ZHAO
,
Deqing LI
材料科学技术（英文）
In this paper, technology margin experiment of hollow cathode fusion are welding (FAW) and penetrating are welding (PAW) is presented in detail. The advantages of PAW, compared with FAW, are better weld formation, narrower welds, as well as a larger welding technology margin. Technological experiment and hydraulic test for the Ti alloy pressure vessels with PAW are described. Also, the weld formation control on Ti alloys is preliminarily analyzed. Finally, conclusions are addressed.
关键词:
