巻号一覧
前身誌
76 巻, 6 号
選択された号の論文の22件中1～22を表示しています
- |<
- <
- 1
- >
- >|
-
鈴木 富雄1990 年 76 巻 6 号 p. 807-816
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (1371K) -
森 滋勝1990 年 76 巻 6 号 p. 817-824
発行日: 1990/06/01
公開日: 2010/05/07
ジャーナル フリー最近の流動層“工学”の進歩を述べなければならないのだが,ここでは,最近の研究と技術開発について現在注目を集めているテーマを例として取り上げ,その成果と課題を紹介する.
鞭,森,堀尾による“流動層の反応工学”が刊行されてから既に5年余りが経過した.本書の1・2節で,流動層の歴史を4期に分け,“第3期で流動化現象を覆っていた未知のベールはほぼ取り除かれ,粒子分散系の挙動の総合的解明に大きな一歩を踏み出したのが現在の第4期である.”と述べたが,その後,流動化粒子や操作条件の拡大にともない,新しいベールに包まれたより一般的な粒子分散系の解明に向けてますます盛んに研究が行われている.この間に,特集記事や成書が刊行された.流動層に関する第4～6回の国際会議も開催され,それぞれのプロシーディングが刊行されている.さらに特筆されるのは,新しく循環流動層だけについての国際会議が既に2回開催されたことで,第3回が1990年10月に名古屋で開催されることになっている.
新しい研究の展開に大きな影響を与えたのは,この間もやはり流動層技術の新たな展開であった.
1980年代に入って1970年代の世界を巻き込んだエネルギー問題も石油価格の低下により一応鎮静化した.しかし,流動層燃焼技術の開発は研究費の削減などの逆風にもかかわらず大きな進展を見た.特に,新しい燃焼技術として登場した循環流動層燃焼装置(CFBC)は,中規模用ボイラーとしてヨーロッパにおいて大成功を納め,その後,米国やアジアにおいても主に産業用ボイラーとして急速に導入されている.このCFBCの成功により,循環流動層(CFB)に関する研究がいっせいに展開され,国際会議が開催されるまでになったのである.
一方,エネルギー問題に続いて主に我が国において起こったファインセラミックスをはじめとする新素材ブームは,流動層を使用した化学気相成長法(CVD)等の新しい反応器の開発やサブミクロン等の微細粒子の流動化に関する研究の強い推進力となっている.
さらに,石油製品のいっそうの白物化に対応するため,より重質な油分が処理できる流動層接触分解プロセス(FCC)の開発や,高度な環境保全に対応できる下水汚泥の焼却,廃棄物や都市塵芥の燃焼とエネルギー利用プラントの開発等は,流動層に対してより高度で精密な設計と操作を要求し,詳細な基礎研究がますます重要になっている.
また,最近では石油化学製品の好調な需要に支えられて各種の新しい触媒反応器の大型化や建設が計画されており,一部では既に稼働しはじめているが,今後の動向は世界的な経済情勢の動向に大きくかかわっている.
鉄鋼分野では,既に読者の方々もよく御承知のように,溶融還元プロセスのための流動層を用いた鉄鉱石の予備還元炉の開発が推進されている.
ここでは,まず流動化現象に関する最近の研究として,循環流動層と微細粒子の流動化を取り上げその現状と課題を紹介する.次に,最近の流動層技術の展開の例として,FCCプロセス,燃焼プロセス,新素材製造技術を取り上げ,最近の展開を紹介する.抄録全体を表示PDF形式でダウンロード (1170K) -
中島 龍一, 黒沢 信一, 福与 寛, 和田 隆, 木村 亮介, 山岡 洋次郎1990 年 76 巻 6 号 p. 825-831
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーSintering condition fluctuates considerably in sintering bed, particularly at large scale sintering machines. The fluctuation deteriorates the quality, yield and productivity of sinter. The fluctuation, therefore, must be controlled to improve both the quality and the sinter operation.
The heat-pattern control system along the width direction of sintering bed has been developed and applied to Ohgishima Sintering Plant at Keihin Works. This system unifies automatically the sintering speed along the width direction by measuring waste gas temperature under pallets at No. 18, 20 and 22 wind box to evaluate the fluctuation and by controlling the five charging gates divided along the width direction of sintering machine.
The coefficient of variation of the waste gas temperature at No. 20 wind box decreased to 0.06 from 0.19 by applying the control system. The sinter quality, the return fine amounts and the productivity of sinter were also improved by decreasing the fluctuation.抄録全体を表示PDF形式でダウンロード (1081K) -
中島 龍一, 岸本 純幸, 堀田 裕久, 下村 昭夫, 石井 邦彦, 山岡 洋次郎1990 年 76 巻 6 号 p. 832-839
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーFor the purpose of decreasing Si content in hot metal by means of flux (CaO, MgO) injection through the blast furnace tuyeres, fundamental experiments and operational tests at Keihin No. 2 blast furnace were carried out. Results obtained are as follows.
(1) The generation rate of SiO gas (K'SiO) based on fundamental experiments were formularized as follows.
K'SiO= 4.07 × 107 × exp (-120 × 103/RT) × αSiO2
(2) For decreasing Si content in hot metal, MgO flux injection from the tuyeres was proved to be more effective than CaO flux injection. As to the charging method of flux, tuyere injection is most effective followed by top charging with coke and top charging with ore.
(3) The decrease in Si content in hot metal by MgO injection was estimated to be mainly due to the decreased generation rate of SiO gas with decreased activity of SiO2 in raceway slag, which is formed by the reaction of coke ash and injected MgO flux.
(4) According to magnesite injection of additional 10 kg/t from the tuyeres, Si decreases due to MgO increase in hearth slag and raceway slag were estimated to be 0.009% and 0.045% respectively.抄録全体を表示PDF形式でダウンロード (1118K) -
井口 学, 川端 弘俊, 岩崎 敏勝, 野沢 健太郎, 森田 善一郎1990 年 76 巻 6 号 p. 840-847
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe vertical bubbling jet region in a cylindrical vessel can be classified into four subregions. They are named the momentum, transition, buoyancy and surface regions from the nozzle exit toward the bath surface. However, the bubble characteristic in each region is not clear even in air-water bubbling jets. The present paper proposes empirical correlations for the bubble frequency and gas holdup in the momentum region in air-water bubbling jet. The momentum region is defined as the region where the gas holdup on the centerline decreases from 100 to 10%. These correlations are applicable to bubbling jets of the modified Froude number from about unity to 2 × 105.抄録全体を表示PDF形式でダウンロード (1022K) -
秋山 友宏, 高橋 礼二郎, 八木 順一郎1990 年 76 巻 6 号 p. 848-855
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーFor heat transfer between particles and fluid stream in industrial moving beds like as blast furnace and shaft furnace for direct reduction, the significant discrepancy has been reported between actual heat transfer rate and that estimated by empirical correlations.
Three modes of steady-state heat transfer experiments have been carried out between nitrogen stream and hematite pellets in a laboratory scale counter-current moving bed reactor. Longitudinal distribution of both pellet and gas temperatures were measured by sheathed thermocouples inserted at the center of the pellet and protruded from inner wall by 5 mm, respectively. In the measurements, thermal gradient was not found within the pellet because of Bi<0.15 where Bi is Biot number. Heat loss through the wall of the bed was also measured by a heat flow meter.
The observed results have been correlated in terms of Nusselt, Reynolds and Prandtl numbers to give :
Nu= 2.0 + 0.39 Pr1/3Rep1/2 (150<Rep<400)
The coefficient 0.39 obtained here is considerably small compared with those of reported correlations.抄録全体を表示PDF形式でダウンロード (1029K) -
川上 正博, 戸野 直之, 堂脇 正市, 伊藤 公允1990 年 76 巻 6 号 p. 856-862
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe possibility to disintegrate bubbles and to accelerate gas-liquid reactions has been investigated by applying ultrasonic vibration to the injection nozzle in water model experiment. The formation of fine bubbles was examined by visual observation. The acceleration effect was examined in absorption of CO2 to NaOH solution and distilled water, and desorption of CO2 from the latter solution. The bubbles were disintegrated by the application of ultrasonic vibration. The effect was remarkable at low gas injection rate. At high gas injection rate, however, large bubbles were formed discontinuously along with the fine bubbles formation. The fine bubbles penetrated deeper into the solution due to the jet stream induced by the ultrasonic vibration. All of the above gas-liquid reactions were accelerated by the application of ultrasonic vibration. This was attributed both to the larger interfacial area caused by the disintegration of bubbles and to longer residence time of bubbles in the solution. The mechanism of the disintegration is considered as follows : in the negative pressure period of vibration, cavities are formed in the vicinity of nozzle tip, where some amount of gas penetrate into, then the gas is disintegrated into fine bubbles in high pressure period of vibration. There existed the optimum nozzle dimension to accelerate the reaction, which was determined by compromise between linear velocity of gas and amplification of vibration at nozzle tip.抄録全体を表示PDF形式でダウンロード (2760K) -
蜷川 伸吾, 佐々 健介, 小塚 敏之, 浅井 滋生1990 年 76 巻 6 号 p. 863-869
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe electromagnetic atomization process in which molten metal was atomized by imposing electric and magnetic fields was studied. In order to improve the controllability of this process, splashing phenomena of molten metal were visualized by use of a high speed camera and a VTR. The observed phenomena were carefully examined and main obstacles disturbing the continuous operation of the process and the sharp particle distribution were removed. A mathematical model was proposed for the better understanding of the process. On the basis of the visualization of splashing phenomena and the calculated results of the mathematical model, it was found that the particle size could be mainly controlled by the distance between a nozzle and an electrode, the delay time of electric current and the mass flow rate of molten metal. The impulse defined as the products of electromagnetic body force and the period of applying electric current, and the momentum of a splashed particle defined as the products of the mass and the velocity of a particle were calculated from the observed data. From the linear relation between the impulse and the momentum, the efficiency in which electromagnetic energy was transformed into the kinetic energy of a particle was evaluated.抄録全体を表示PDF形式でダウンロード (6310K) -
竹内 秀次, Jacqueline ETAY, Marcel GARNIER1990 年 76 巻 6 号 p. 870-877
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーA theoretical analysis has been made to clarify the stability condition of Horizontal Electromagnetic Casting (HEMC) by means of the linear stability theory. The stabilities of thin plates and round rods of molten metal are analyzed when infinitesimal perturbation waves are added on the free surface of molten metal levitated by electromagnetic force.
The analysis reveals that influence of imposed magnetic field on the stabilization of perturbated surfaces is anisotropic and that the free surface of the metal is most stable when magnetic field is imposed parallel to the perturbation wave vector. The critical wave length which distinguishes stable condition from unstable one is 0.02 m for a molten steel plate with applied current density of 106 A/m2. This length practically limits the distance between a metal supply nozzle and solidified part of the metal.
The critical wave length for a round rod is almost the same as that for a plate if the diameter of the rod is the same as the thickness of the plate.抄録全体を表示PDF形式でダウンロード (1303K) -
潘 偉, 佐野 正道, 平沢 政広, 森 一美1990 年 76 巻 6 号 p. 878-885
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe phosphorus reaction between molten Fe-C-P alloy([% C] = 4.4) and Li2O-CaO-SiO2-FetO slag has been investigated under the condition of mechanical stirring at 1300°C. The partial pressure of oxygen in the atmosphere and the initial concentration of FetO in the slag were varied between 0 and 0.2 atm and between 3 and 15%, respectively. The initial concentration of P in the metal was below 0.1%. In the case of rephosphorization experiment the initial concentration of P in the slag was 1.1%.
The dephosphorization rate is much affected by the initial concentration of FetO in the slag and the partial pressure of oxygen in the atmosphere, but not affected by the mechanical stirring. In the case of rephosphorization experiments the rate of rephosphorization of metal increases with increasing rotating speed of stirrer. It is found that the maximum ratio of phosphorus concentration in the slag to that in the metal ((% P)/[% P])max largely increases with increasing Fe3+/(Fe2++Fe3+) which is dependent on the partial pressure of oxygen in the atmosphere. The ratio of ((% P)/[% P])max decreases with increasing rotating speed of stirrer larger than 50 rpm. A mathematical model is developed to explain the experimental results. It is shown that the present model can interpret the simultaneous reactions between molten iron of high carbon concentration and slag containing FeO and Fe2O3.抄録全体を表示PDF形式でダウンロード (1196K) -
吉原 直武1990 年 76 巻 6 号 p. 886-893
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーDuring on-line controlled cooling of continuous motion type, steel plates are subjected to successive water cooling from the top to the bottom. Therefore thermal gradients in the longitudinal direction necessarily arise. Especially in the cooling which requires a large temperature drop like direct quenching, the plates will buckle by thermal stress generated from the longitudinal temperature gradient and shape problems will occur.
Those plates are flattened by hot leveler, but afterward the buckling may occur during air-cooling, if the temperature in the plates is not uniform just after the leveling.
We carried out the finite element method analysis on buckling caused by thermal stress which arose from the longitudinal temperature distribution during and after the controlled cooling.
The following terms were examined quantitatively.
(1) Effect of the zone length of controlled cooling, the plate thickness and the plate width on the buckling behavior during and after the controlled cooling.
( 2) Arrangement condition of pinch rolls for avoiding the buckling under the controlled cooling.
The knowledge obtained from the analysis contributed to the development of the controlled cooling equipment in the plate factory of NKK's Keihin Works. Now it is useful for the guide in the actual operation.抄録全体を表示PDF形式でダウンロード (1502K) -
武本 敏彦, 村田 康, 田中 照夫1990 年 76 巻 6 号 p. 894-901
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーEffects of alloying elements and thermomechanical treatment on mechanical and magnetic properties of Cr-Ni austenitic stainless steel have been investigated.
N and Si increase hardness after cold rolling as well as strain age hardening. Si decreases γ stability with respect to α' transformation, while other alloying elements increase it. Nonmagnetism can be maintained by controlling Nieq, an index of γ stability. High strength-nonmagnetic stainless steel can be obtained by utilizing strain age hardening and Nieq.
Si changes deformation mode from dislocation multiplications to formation of stacking faults. Si increases X-ray halfwidth at a given cold rolled condition, while decreasing it after aging treatment. It is considered that a large strain age hardening by Si is attributed to increase of internal strain and precipitation hardening. The decrease of γ stability by the addition of Si may be due to the accerelation of formation of α' phase by virtue of ε phase.抄録全体を表示PDF形式でダウンロード (12747K) -
奈良崎 道治, 淵澤 定克, 稲葉 正光1990 年 76 巻 6 号 p. 902-909
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe effect of surface texture on the characteristic temperature during quenching of silver, nickel and SUS 304 stainless steel cylinders in still subcooled water has been investigated. The following results were obtained,
1)The surface texture of specimen does not affect the cooling characteristics at initial solid-liquid contact stage and next vapor blanket stage. But the characteristic temperature and its dependence on liquid subcooling are strongly affected by the surface texture.
2) The characteristic temperature becomes higher with increase of surface roughness and liquid subcooling. Even if the surface roughness are nearly equal, the characteristic temperature is affected by the surface geometry which varies with the methods of surface finish.
3) If the surface of specimen is sufficiently roughened, the characteristic temperature becomes higher with increase of liquid subcooling and its dependence on liquid subcooling shows a similar tendency to that of HENRY's equation. On the other hand, if the surface is sufficiently smooth, the characteristic temperature approaches to the values predicted by hydrodynamic model by BERENSON.抄録全体を表示PDF形式でダウンロード (4485K) -
丹羽 直毅, 出村 泰三, 伊藤 邦夫1990 年 76 巻 6 号 p. 910-916
発行日: 1990/06/01
公開日: 2010/02/16
ジャーナル フリーOn Ti-15-3 (a shortened designation for Ti-15V-3Cr-3Sn-3Al) and other two alloys which contain less V and Cr and more Al compared with Ti-15-3, the effects of alloy elements Al, V and Cr on beta transus temperature, aging behavior and mechanical properties were examined.
This variation in composition causes a little increase in beta transus temperature and nose temperature. At fully aged condition, it produces a little increase in hardness and great increase in alpha phase volume fraction. Among the effects, it is notable that it produces rapid aging to fully aged condition, however, it does not alter the strength-ductility relationship in fully aged condition.抄録全体を表示PDF形式でダウンロード (4280K) -
中沢 興三, 角田 方衛, 丸山 典夫1990 年 76 巻 6 号 p. 917-923
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe saturation behaviors of damage in fretting fatigue at frequencies of 1 and 20 Hz in seawater under freely corroding condition were studied using high strength steels having tensile strengths of 490, 690 and 880MPa. Fretting damage saturated beyond a certain number of fretting cycles, and this number varied drastically with the steel and the frequency. The saturation behaviors of damage could be divided into two groups, that is, the smallest numbers of fretting cycles to cause the saturation were less than 0.1% of the fretting fatigue life (group 1) and more than 40-60% (group 2). They had a strong relationship to crack initiation and growth behaviors. In group 1, cracks propagated normal to the alternating stress axis from the early stage of crack propagation. However, in group 2 the cracks propagated at angles less than 90° to the alternating stress axis, but changed direction to become normal as they propagated beyond a certain length. This relationship could be explained from the mechanism that the decrease in the fretting fatigue lives of group 1 resulted from the decrease in crack initiation life caused by the acceleration of corrosion pit formation, and that of group 2 from crack initiation and growth caused by fretting.抄録全体を表示PDF形式でダウンロード (4587K) -
梅澤 修, 長井 寿, 石川 圭介1990 年 76 巻 6 号 p. 924-931
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーIn titanium alloys subsurface fatigue crack initiation occurs apparently without the existence of any defects such as inclusion or pore. We investigated subsurface crack initiation and sub-crack for Ti- 6Al-4V alloys at cryogenic temperatures, and discussed the growth mechanism of microcrack.
As the maximum stress was decreased, the morphology of subsurface crack initiation sites was changed from consisting of one facet to of more facets. The facet was identified as a cracked α phase by comparing their chemical composition and morphology. Sub-cracks were also produced in α phase. The subsurface crack initiation sites and the ub-cracks were not perpendicular to the applied stress. Hence it is concluded that a microcrack initiates in a α grain, grows into neighbor β plates and α grains, and finally forms an initiation site for a main fatigue crack. The lower the maximum stress, the greater the size of subsurface crack initiation sites. We adopted the size of the projection of subsurface crack initiation site on the main crack propagating plane, as a shape parameter of three-dimensional crack. Using this parameter, the dependence of initiation site size on the maximum stress range can be accounted for by an assumption that the microcrack growth is controlled by a threshold condition.抄録全体を表示PDF形式でダウンロード (12548K) -
堀谷 貴雄, 鈴木 洋夫, 岸 輝雄1990 年 76 巻 6 号 p. 932-939
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーEffect of microstructure on fracture toughness of β type Ti-15V-3Cr-3Sn-3Al alloy (Ti-15-3) was systematically examined.
At 0°C, fracture toughness (δc) is gradually decreased as strength (0.2%PS) increased. A linear relationship is obtained between fracture toughness and strength, regardless of microstructure: morphology of precipitated a phase or β grain size. Compared with (α + β) type Ti-6Al-4V alloy (Ti-6-4), Ti-15-3 has almost the same δc, in the strength range of 80 to 90 kgf/mm2 and has a higher fracture toughness above the strength of 100 kgf/mm2. The difference in fracture toughness between Ti-15-3 alloy and Ti-6-4 alloy is attributed to the difference in crack extension resistance of microcracks developed at the notch tip before unstable fracture.
At -196°C, fracture toughness is linearly decreased with increasing strength, independent of microstructure. However, the decrease in fracture toughness is rather small. Contrary to the case at 0°C, Ti-15-3 had a lower fracture toughness near the strength of 150 kgf/mm2 than that of Ti-6-4. This is because Ti-15-3 had a lower crack initiation toughness (δi) than Ti-6-4 at -196°C.
It was found that crack initiation toughness (δi) of Ti-15-3 has a close relationship with reduction of area in the round bar tensile test. And crack resistance property was greatly influenced by both strength and the size of a phase precipitated during aging.抄録全体を表示PDF形式でダウンロード (10543K) -
太田 芳雄, 中川 幸也, 大浜 信一1990 年 76 巻 6 号 p. 940-947
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーA precision casting of high pressure turbine blades and vanes consisting entirely of an oriented single grain of nickel-based superalloys has been introduced in most advanced aircraft engines due to their superior high temperature strength. This paper presents a description of the casting process for single crystal components and the evaluation of high temperature properties for a newly developed alloy TMS26 in comparison with the existing alloys. Major outcomes are summarized as follows;
(1) Selecting the most adequate casting procedure and parameters, high quality single crystal blades in which their longitudinal orientation divergence from <100> was less than 10 degree were consistently procedured from TMS26 and CMSX-2 (an existing alloy) with a yield in excess of 90%.
(2)Mechanical properties (tensile, creep and low cycle fatigue strength) and several physical properties of TMS26 were found to be generally superior to those of existing commercial alloys.抄録全体を表示PDF形式でダウンロード (3478K) -
細井 紀舟, 横須賀 常信, 吉田 寿美, 正岡 功, 佐々田 泰宏1990 年 76 巻 6 号 p. 948-955
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe correlation between grain boundary segregation and intergranular corrosion in solution heat treated Type 304L stainless steel was examined. Grain boundary composition was analyzed with a high resolution analytical electron microscope (HRAEM). Intergranular corrosion susceptibility was tested in 9 kmol/m3 nitric acid solution containing 1 mol/m3 Ru at 373 K for 1.8 Ms. The followings are found: (1) The amount of phosphorus segregation to grain boundaries in solution heat treated stainless steels were successfully measured quantitatively with HRAEM. The amount of phosphorus segregation increases with higher phosphorus content, and the phosphorus concentration of grain boundary becomes about a hundred times of that of grain interior. (2) Phosphorus and silicon additions cause intergranular corrosion. The correlation between amount of phosphorus segregation and intergranular penetration depth is seen in low silicon content steels. But high silicon content steels show deep intergranular penetration depth, in spite of the small amount of phosphorus segregation. (3) Assuming MCLEAN'S model of equilibrium segregation, the segregation free energy of phosphorus at 1323 K is estimated as about 57 kJ/mol.抄録全体を表示PDF形式でダウンロード (4669K) -
小林 敏治, 新井 隆, 板垣 孟彦, 山崎 道夫1990 年 76 巻 6 号 p. 956-963
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーThe low BTU coal gasification-complex generation technique was the national project in Japan. In the project, selection of materials for the gas turbine was done. Coal gas which was supplied by gasifier of Coal Mining Research Centre was cleaned up, and then exposure of samples was done under combusting condition close to actual apparatus gas. Specimens of commercial superalloys which were diffusion-coated by aluminium or chromium were evaluated by appearance and by weight change after exposure. Maximum weight loss at 1 000 h was very small to be 11 mg /cm2. But, under certain circumstances, weight loss of base alloys was considerably larger than coated samples. Therefore, the effectiveness of diffusion coating was recognized. The combution gas was found to be oxidative, because of formation of oxide scale. Sulfur was detected in a scale formed in both dry and wet cleaning methods of gas, and alkali metals were also detected in a scale formed in dry-cleaned gas. It was shown that there was influence of sulpheric corrosion on high temperature oxidation. If present samples are evaluated by estimating maximum scaling loss at 10000 h, there will be no problems from a view point of material deterioration.抄録全体を表示PDF形式でダウンロード (13607K) -
宮原 一哉, 坂本 康裕, 茅野 秀夫, 細井 祐三1990 年 76 巻 6 号 p. 964-966
発行日: 1990/06/01
公開日: 2010/02/16
ジャーナル フリーPDF形式でダウンロード (4905K) -
大中 逸雄1990 年 76 巻 6 号 p. 977
発行日: 1990/06/01
公開日: 2009/06/30
ジャーナル フリーPDF形式でダウンロード (146K)
- |<
- <
- 1
- >
- >|