Materials Literature
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Aluminum alloys have already been put to practical use in a liner material of a high-pressure hydrogen tank for fuel cell vehicles. However, the behavior of hydrogen in aluminum alloys have not been clearly understood yet. Therefore, it is necessary to analyze the hydrogen behavior in aluminum alloy materials. Hydroge…
AZ61 magnesium alloy plate with 0.6mm thickness was friction seam welding using a rotating disk. The rotating disk was made with SUS304 stainless steel to 100mm in diameter, 10mm in thickness. The microstructure of the weld interface showed finer than that of the base metal. The weld interface had an irregularity. The…
U vodenim sredinama, kao što su slatka i morska voda, vlažno tlo, te otopine soli, kiselina i lužina, ukopana oprema pod tlakom vrlo često podložna je kemijskom trošenju, tj. koroziji elektrokemijskim oksidacijsko-redukcijskim (redoks) procesom.
SUS304 steel is a kind of the austenitic stainless steel. It is used for various fields, example for the plant and the nuclear plant. The austenite phase is non-magnetism usually, but when SUS304 steel is received a big stress, a part of it is transformed into the martensitic phase that is ferromagnetism. In recently…
Damping of polyarylate fiber reinforced plastics is analysed experimentally using a cantilever beam test specimen and an impulse technique. The experimental results are compared with damping properties of CFRP. It is recognized that polyarylate fiber reinforced plastics have higher damping capacity than CFRP. Next, th…
"MR fluid porous composite" made of a nonwoven containing MR fluid has been developed and the rheological properties in oscillatory shear mode under uniform magnetic field have been evaluated. MR fluid porous composite can prevent the dispersed particles from settling and doesn't need a seal that keeps the MR fluid in…
以L-谷氨酸与硝酸锌为原料合成了一种三维手性聚合物材料[Zn（H2O）（glu）]n（1）,对其进行了元素分析、红外及X射线单晶衍射等表征;晶体结构分析表明该材料属正交晶系,P212121空间群,晶胞参数：a=7.144（2）°A,b=10.355（3）°A,c=11.065（4）°A,V=818.6（5）°A3,Z=4.它是由L-谷氨酸根的羧基桥联的螺旋链组装而成的微孔材料,孔道尺寸为9.8×5.5°A2,纳米级.有趣的是在纳米级孔道内发现了十四元环的客体水簇.
Tato práce popisuje přípravu a charakterizace bazických katalyzátorů na bázi draslíku a Mg-Al hydrtalcitů. Katalyzátory byly charakterizovány různými metodami: XRD, SEM, FTIR a další. Aktivita katalyzátorů byla studována v transesterifikační reakci rostlinného oleje.
采用液态离子交换法制备了不同含量的Mn／ZSM-5型分子筛催化剂，并考察了上述催化剂的物理化学特性及其在NH3-SCR反应中的催化性能。理化分析结果表明：所制备催化剂在Mn含量≤9．2％时具有高度的分散性，分子筛表面团聚的氧化锰颗粒粒径小于4nm；锰元素主要富集于分子筛的浅层及表面。催化性能研究结果表明：Mn含量达到1．4％时，低温催化中心即达饱和，继续增加Mn含量对低温反应性能影响不大；反应温度超过300℃时，高温催化中心开始起作用；含量为3．1％的Mn／ZSM-5催化剂具有最宽的高活性反应温度窗口。
We conducted an in-plane cyclic loading test for an AZ31B magnesium alloy sheet with various strain amplitudes. Metallographic observation was also carried out to investigate the effect of twinning on the work-hardening behavior. The work-hardening rate in later stage of compression rose with the number of cycles, whe…
Accurate measurements of the elemental composition of cosmic rays over a wide energy range are required in order to understand the origin, propagation and lifetime of the cosmic radiation. The primary cosmic rays (e.g. C and O), produced at the sources, propagate through the interstellar medium giving information abou…
采用等离子体法制备Pd/γ-Al2O3催化剂,用场发射电镜（TEM）和X射线衍射（XRD）对其进行表征,并考察其对催化氧化低浓度CO的性能。结果表明：Pd/γ-Al2O3经等离子体处理,Pd2＋被还原成单质Pd;催化剂表面Pd颗粒小,分散均匀,而常规浸渍法制备的催化剂有明显的团聚现象。在60℃,空速为15 000 h-1时,在等离子法制备的Pd/γ-Al2O3作用下,CO的转化率达到92%,比常规浸渍法制备的催化剂提高了25%。
TiN films were deposited on out-of-plane rotating Si(100) substrate by an ion beam assisted deposition technique. The influence of out-of-plane rotation on the film morphology, orientation and mechanical properties was investigated by SEM observation, X-ray diffraction analysis and nano-indentation tests respectively.…
The exploration of cavitation bubbles has been one of the most important challenging research problems in fluid dynamics. Much effort has been done to elucidate how bubbles may rebound and shrink from the viewpoint of macroscopic level. However, the bubble nucleation and collapse have not been fully clarified since th…
This paper describes an effect of twist contraction ratio (TCR) on tensile properties of ramie twisted yam for green composites. Twisted yams were made from single yams using an automatic or hand-operated twisting machine, in which the number of single yams and twist per inch (TPI) were changed. Then, TPI and TCR of t…
Actualmente, existe un interes creciente en el desarrollo de la Quimica Organometalica y de Coordinacion de los denominados post-metalocenos, tanto para los metales de los grupos principales como para los de transicion. Esta Tesis doctoral ha contribuido a la expansion de la quimica de estos ligandos heteroescorpionat…
The off-axis notched strength of a plain woven roving fabric CFRP laminate has been studied with emphasis on its fiber orientation dependence and dominant failure mode. Static tension tests were carried out on center hole specimens with different diameters of a hole and different fiber orientations, respectively. The…
Fine particle size measurement technique with laser interference fringes is proposed as one of the in-line measurement techniques to the diameter of several hundred nano meter particles. The objective of this study is to examine the principle of this measurement technique with laser interference fringes. First, we vis…
The aim of present study is to investigate the mechanism of minute deformation behavior, such as nucleation and growth behavior of twin region, around yield point of polycrystalline pure Ti. Firstly, we prepare commercial polycrystalline pure Ti (99.5%) thin plate (Nilaco co.) and fabricate tensile specimens. Secondly…
This paper reports macro and micro frictional properties of DLC, TiN, CrN films and GC substrate of which surfaces are nanostructured with femtosecond (fs) laser pulses. The friction coefficient μ of the nanostructured surface was measured with a ball-on disc friction test machine at a usual load, and with a micro-scr…