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1.
AKIO MAKEHIMA YOSHIAKI TAMURA TERUO SAKAINO 《Journal of the American Ceramic Society》1978,61(5-6):247-249
Glasses in the system Al2 O3 -Y2 O3 -SiO2 , containing TiO2 and La2 O3 , were investigated. Glasses of high refractive index and elastic modulus were developed. The observed Young's and shear moduli of these glasses show good agreement with theoretical values. Agreement was also found between the observed and calculated values of refractive index when the Appen's empirical coefficients were used. 相似文献
2.
CARL BRUCH MIKIYASU NAKAYAMA JESSICA TROELL LISA GOLDMAN ELIZABETH MARUMA MREMA 《国际水资源开发杂志》2007,23(3):391-410
Transboundary impact assessment (TIA) has become an important environmental management tool, particularly where a project may have transboundary impacts. With the growing practice of TIA, it becomes important to consider the accuracy of the transboundary impact assessments that are being conducted. If TIA is a planning tool designed to provide a basis for making an informed decision, does it actually provide the necessary information? This paper summarizes lessons learned in pilot testing a methodology to assess the accuracy of TIAs. 相似文献
3.
QIU-SHENG LIU KATSUHISA OHNO HIROTAKA NAKAYAMA 《International journal of systems science》2013,44(6):903-914
A multi-objective discounted Markov decision process (MDP) with expectation and variance criteria is discussed. First, difficulties in variance minimization are discussed and it is shown that variance minimization is much more difficult than the expectation optimization. Then, the multi-objective MDP with expectation and variance criteria is formulated as a multi-objective non-linear programming problem. An algorithm for finding a stationary satisfactory Pareto policy is proposed by applying the satisficing trade-off method of Nakayama. In the proposed algorithm, a decision-maker need not have a high degree of judgment and it is easy to take the balance of expectation and variance criteria and furthermore, the number of auxiliary optimization problems to be solved is quite small. Numerical examples show the efficiency of the proposed algorithm. 相似文献
4.
Effects of titanium on magnetic properties of semi-processed non-oriented electrical steel sheets 总被引:1,自引:0,他引:1
The effects of titanium inclusions on magnetic properties of non-oriented electrical steel sheets were investigated. The magnetic
induction and core loss of test specimens deteriorated as the titanium content increased. Electron microscopic study revealed
that the deterioration was classified into two types: one was caused in the steels containing <0.016 wt% titanium by the “pinning
effects” of titanium carbonitrides on the recrystallization of cold-rolled sheets, and the other occurred in the steels containing
>0.016 wt% titanium by numerous (Fe, Ti)P precipitates in both grains and grain boundaries.
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
5.
Oxidative stabilities of docosahexaenoic acid (DHA, 22:6 n-3)-enriched oils (7.0 – 7.1 mol% of total fatty acids), in the form of phospholipids (PL), triacylglycerols (TG) and ethyl esters (EE), were comparatively investigated with those of control oil (palm oil supplemented with 20% soybean oil; containing no DHA). Autoxidation of sample oil (50 mg) was performed in a 10 mL glass vial at 25C for 42 days in the dark. During the oxidation, headspace oxygen absorption was significantly lower in oil in the form of PL than TG and EE, and was almost equivalent to that of control oil. At day 42 of oxidation, peroxide value and carbonyl value of PL were lower than those of TG and EE. The change of constituent fatty acids during the oxidation was larger in TG and EE than PL. The results indicated that DHA-enriched oils in the form of PL are more stable to autoxidation than those in the form of TG and EE. 相似文献
6.
JUNN NAKAYAMA 《Journal of the American Ceramic Society》1965,48(11):583-587
A noncatastrophic fracture was shown to exist in the three-point bending test with a "hard-beam" machine when an artificially cracked or notched specimen was used. In this mode of fracture the energy produced by external work was transformed completely into the effective surface energy (fracture energy) of the specimen. The energy was measured from the load-time curve for the test. The fracture energies obtained by this method for plate glass were in the range 3 to 6 × 103 ergs cm−2 , in good agreement with results obtained by other methods. The effective fracture energies of firebrick were about one order of magnitude larger than those of glass. 相似文献
7.
TAISEI NAKAYAMA TAKASHI TANAKA AKIHIRO YAUCHI HIROYOSHI YASHIKI 《Journal of Materials Science》1997,32(1):119-122
Nitrogen absorption is usually observed during batch-type hot-band annealing of electrical steel sheets containing aluminium. This nitrogenizing causes the deterioration of magnetic properties, such as core loss and induction. In order to prevent nitrogenizing, we investigate an antimony treatment on the hot strip surface of electrical steel sheets containing aluminium. Potassium antimonyl tartrate and colloidal antimony oxides (Sb2O5) are effective against nitrogenizing. It seems that active sites on the surface of the hot strip after pickling are covered with antimony oxides to block the adsorption of nitrogen. Magnetic properties, after cold-rolling and continuous annealing of the nitrogenizing hot band, deteriorate due to small grains near the surface whose boundaries are pinned by aluminium nitrides. 相似文献
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