Materials Literature
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A submicroscopic surface roughness as well as the atomic scale roughness are required for the observations of the strong SERS signal. The submicroscopic roughness is necessary to occur the electromagnetic enhancement of Raman scattered light, whereas the atomic scale roughness, i.e. the existence of the 'active sites'…
The current trend in Solid Oxide Fuel Cell (SOFC) development is for a lowering of the operation temperature from ~ 1000°C to temperatures as low as 600°C. This lowering of temperature is beneficial in a number of ways. It relaxes the stringent materials requirements for cell components, particularly, the interconnect…
Reactive ion etching (RIE), a well established technology in semiconductor industries, has proven to be also a versatile tool for the fabrication of optical components. Using fluor based processes, we fabricated refractive spherical and cylindrical microlenses as well as various diffractive optical elements (DOEs) e.g…
The alloy phases of the galvanized steel have been examined in order to clarify the effect of phosphorous added in the steel substrate on the galvannealing behavior. SEM observation have revealed that the density of the ζ-ZnFe crystal decreases and that the size of the ζ-ZnFe crystal becomes large as a function of the…
懸濁安定剤としてリン酸三カルシウム粉末 (TCP) を使用して, スチレンの懸濁重合を実施した.そして, TCPに2, 3の界面活性剤を吸着させることにより連続水相中における帯電特性を変化させ, ポリマー粒子径に及ぼす影響を検討した.ζ電位0mV付近において, TCPは凝集したが, ポリマー上滴表面への付着量は増加した.結果として, 粒径が小さく, 均一性の高いポリマー上粒子が生成された.
Markov process was applied to the chain-of-bundles probability model which is often used for the axial strength analysis of a unidirectional fibrous composite. It was assumed to the process that a group consisting of fiber breakage points, the so-called cluster, evolves in time intermittently subject to two kinds of l…
An overview is provided on the properties and growth of passive films on Fe group metals and stainless steel. The growth kinetics of passive film might be explained by the Cabrera-Mott theory with some modifications. Passivation of stainless steel is characterized by Cr enrichment in the film with some critical Cr con…
A degradation phenomenon of the inner semicon layer of extruded cable insulation occasionally has been observed in different service aged as well as in laboratory aged polymer insulated cables. To investigate this effect, accelerated aging tests on XLPE-insulated cable cores as well as on a new type of model sample (a…
Metal alkoxides of subvalent Ge, Sn and Pb, M(OtBu) 2 , as well as their mixed metal alkoxides of the general formula M'M z (OtBu) 6 (M' = Ca, Sr, Ba; M = Ge, Sn, Pb; tBu = tert-Butyl) have been found to be excellent precursors for CVD processes. When heated to 350 - 450°C they decompose to yield iso-butene and tert-b…
In the research reported in this paper, polypropylene-based polyethylene (PP/PE) copolymer and polypropylene (PP) homopolymer filaments were processed by using the Reicofil spunbonding line at the Textiles and Nonwovens Development Center (TANDEC) of the University of Tennessee, Knoxville. The properties of the filame…
The main objectives of this research have been to study the possibilities of using residual oils from the steel rolling-mill process as an additive in a coal blend to be carbonized in a coke oven plant and, consequently, to reduce the cost of coking blends. This type of residual oils is classified as a hazardous mater…
Diagnostic imaging techniques are an essential component of modern patient management. To maximise the yield of diagnostic information from these procedures, pharmaceutical grade contrast agents can be administered which will enhance regions of the image by virtue of their presence in the patient. This concept is well…
The three multicomponent systems (KCl—KBr—H2O, K2SO4—(NH4)2SO4—H2O, KNO3—NH4NO3— H2O) with mixed crystals in their solid phases have been studied. The isotherms of solubility and the curves of distribution have been mathematically described. The system of equations, which allows to calculate the quantitative changes r…
A small amount of carbon was doped into a Cu-15 mass%Cr in situ composite to increase the strength of the material. It is found that in the as-cast state Cr dendrites exhibit a needle shape, which can be deformed into fibers much easier than the equiaxial one.A SIMS analysis with the aid of thermodynamic simulation an…
Cu3BiS3 has been synthesized to clarify the thermal nature related to the ionic conduction. Heating and cooling measurements by the DSC showed reversible nature as a whole, except for a little hysteresis on temperature of the first order transition around 100–110°C. Resistivity decreased steeply from room temperature…
Recent experimental studies by Hauver et al. reveal that the ballistic performance of ceramic targets depends entirely on how the ceramic is confined in a composite target. If the ceramic confinement is preserved, the penetrator is consumed by lateral flow at the ceramic-cover plate interface; this mechanism is known…
(1) Oxidation behavior of Si3N4 ceramics is affected by the composition of sintering aids and the weight gain due to oxidation tends to decrease with increasing SiO2/Yb2O3 ratio. In specimens with SiO2/Yb2O3 ratio from about 0.07 to 0.14, the weight gain is small. In specimens with SiO2/Yb2O3 ratio larger than about 0…
Three kinetic steps were observed for the complexations of Eu3+ and UO22+ by PAR [4-(2-pyridylazo)resorcinol] or PAN [1-(2-pyridylazo)-2-naphthol] in different buffered solutions. The first step can be assigned to the co-ordination of the nitrogen donor from the pyridine moiety of the ligand based on the dependencies…
100 keV O+ or N+ ion implantation was used to study the irradiation effect on the methane combustion activity of 1 mass%Pd, Pt, and Rh supported on γ-Al2O3 . The catalytic activity of both Pt/Al2O3 and Rh/Al2O3 was enhanced by the implantation, probably due to the improved dispersion of noble metals. On the other hand…
Phase formation has been studied in a nanosize composition of aluminum oxide and silicon dioxide. The temperature ranges for an intensive solid-phase reaction have been determined. A mechanism is proposed for phase formation in nanosize film compositions.