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RISS 인기검색어
- 검색키워드
- 저자 : Hiraoka H. (검색결과 4 건)
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Modelling the Leipzig Wind Profile with a (k-ε) model
Hiraoka, H. Techno-Press 2001 Wind and Structures, An International Journal (WAS Vol.4 No.6
The Leipzig Wind Profile is generally known as a typical neutral planetary boundary layer flow. But it became clear from the present research that it was not completely neutral but weakly stable. We examined whether we could simulate the Leipzig Wind Profile by using a ($k-{\varepsilon}$) turbulence model including the equation of potential temperature. By solving analytically the Second Moment Closure Model under the assumption of local equilibrium and under the condition of a stratified flow, we expressed the turbulent diffusion coefficients (both momentum and thermal) as functions of flux Richardson number. Our ($k-{\varepsilon}$) turbulence model which included the equation of potential temperature and the turbulent diffusion coefficients varying with flux Richardson number reproduced the Leipzig Wind Profile.
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Mechanical Properties of W-X (X=Cu, Ag or BAg-8) Composites
Hanado H.,Hiraoka Y.,Inoue T.,Akiyoshi N. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Bend tests were performed at temperatures between 77 and 473K for W-19vol%Cu, W-22vol%Ag and W-19vol%(BAg-8) composites. Yield and maximum strengths and ductility of the composite were discussed in terms of microstructure and fractography. Results are summarized as follows. (1) Almost no difference was recognized in yield strength between the composites. In contrast, a large difference was recognized in maximum strength and ductility between the composites. (2) Inferior mechanical properties of W-Ag composite to W-Cu composite are attributed to heterogeneous distribution of Ag-phases, whilst inferior mechanical properties of W-(BAg-8) composite to W-Cu composite are attributed to large pores at grain boundaries.
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CaO 및 MgO 를 도핑한 몰리브덴 판재의 결정립 성장
최주,나형용,유명기,문길수,평강유 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.11
Grain growth was studied on the straight rolled molybdenum sheet doped with CaO and MgO and compared with that of pure molybdenum sheet. Texture change was also investigated during annealing. Optical, scanning and transmission electron micrographs were observed to link the grain growth with the change of recrystallization texture. The rolling texture consisted of one strong component, {100}$lt;011$gt; and two weak components, {211}$lt;011$gt; plus {111}$lt;011$gt; in doped molybdenum and one strong component, {100}$lt;011$gt; and one weak component, {211}$lt;011$gt; in pure molybdenum. When annealing was done up to 1978℃, the recrystallization texture of pure molybdenum sustained a rolling texture, {100}$lt;011$gt;. However, that of doped molybdenum only retained a rolling texture, {100}$lt;011$gt; at a temperature below 1950℃ and changed into near (211)[011] single crystal over this temperature. Upon annealing at this critical temperature, 1950℃, a new large grain was nucleated rapidly from a rolling plane by Nielsen-type coalescence mechanism and subsequently secondary recrystallization occurred at the expense of small matrix grains. Its orientation was far from approximately 30˚about $lt;100$gt;.
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Yimiti, W.,Yahaya, M.S.,Hiraoka, H.,Yamamoto, Y.,Inui, K.,Takeda, M.,Tsukahara, A.,Goto, M. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.5
The experiment of silage for preservation of fresh Italian ryegrass (Lolium multiflorum) was carried out to examine whether the fermentation quality and microbial degradation in the rumen can be altered by the treatment of amino acids fermentation byproduct (AFB). The plant was ensiled for 40 days with 4 treatments of different ratios of AFB and sugarcane molasses (SCM) mixture. The treatment 2 (T2, AFB:SCM=100:0) and treatment 3 (T3, AFB:SCM=40:60) silages showed higher (p<0.05) concentrations of lactic acids, lower (p<0.05) pH and dry matter (DM) losses than the Control (T1, none additive) and treatment (T4, AFB:SCM=0:100) silages. The treatments 2 and 3 contained higher (p<0.05) DM and crude protein contents in silages compared to treatments 1 and 4 silages. The NDF, ADF and cellulose contents were also lower (p<0.05) in T2, T3 and T4 silages than T1 silage and fresh material before ensiled. The in situ rumen DM, NDF, ADF, hemicellulose and cellulose degradability was also higher (p<0.05) in T2, T3 and T4 silages than T1 silage, while the highest improvement was achieved with addition of AFB:SCM at level of 40:60 at ensiling. The result in this study indicates that the addition of AFB and SCM additives improved the silage fermentation and cell wall degradability of Italian ryegrass silage.
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