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Gas diffusion in an automotive catalyst in an unsteady state
Hiroshi Yamada,Tomohiko Tagawa,Satoru Kato,Naoki Takahashi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
The influence of gas diffusion is often ignored because the washcoat layer is thin. Therefore, in addition todeveloping new catalytic materials, modifying the washcoat pores is important for improving effectivegas diffusivity. The gas diffusion phenomena in an unsteady state in an experimentally simulated washcoatlayer were evaluated by the pulse injection method. Wicke–Kallenbach diffusion cell was used. Effective diffusion coefficients obtained in an unsteady state were compared to those obtained in a steadystate. The effective diffusion coefficients were similar to the values obtained under a steady state, exceptfor low-molecular-weight gasses, due to the difference in mean molar speed between the evaluating gasand atmospheric gas.
Facial EMG pattern evoked by pleasant and unpleasant odor stimulus
( Hiroshi Yamada ),( Noriaki Kaneki ),( Koji Shimada ),( Hironori Okii ) 한국감성과학회 2002 춘계학술대회 Vol.2002 No.-
Activities of venter frontalis, corrugator, levator labii superioris and greater zygomatic muscles were measured for five male subjects while they made pleasant, unpleasant and neutral facial expressions, and while they were presented pleasant, disgusting, and neutral odors. Pleasant expression and odor activated zygomatic muscles while unpleasant expression and odor increased corrugator muscle activity.
Involvements of Stress Triaxiality in the Brittle Fracture during Earthquakes in Steel Bridge Bents
Hiroshi Tamura,Eiichi Sasaki,Hitoshi Yamada,Hiroshi Katsuchi,Theeraphong Chanpheng 한국강구조학회 2009 International Journal of Steel Structures Vol.9 No.3
Stress triaxiality is proposed as one of the key parameters to discuss the cause of brittle fracture during earthquakes in steel structures. This study analytically investigated the features of stress triaxiality in steel bridge bent subjected to earthquakes. The target structure is a steel bridge bent actually fractured during the South Hyogo prefecture Earthquake. From the investigations, it was confirmed that high stress triaxiality was generated at a point supposed as fracture origin. There is a possibility that the triaxiality was involved in the fracture strongly through the increase of maximum principal stress. Moreover, from the analyses accounting for several kinds of large earthquake waveforms, it was indicated that threre is possibility that the distribution of triaxiality around the fracture origin was not affected by significantly by each cycle and each waveform. Stress triaxiality is proposed as one of the key parameters to discuss the cause of brittle fracture during earthquakes in steel structures. This study analytically investigated the features of stress triaxiality in steel bridge bent subjected to earthquakes. The target structure is a steel bridge bent actually fractured during the South Hyogo prefecture Earthquake. From the investigations, it was confirmed that high stress triaxiality was generated at a point supposed as fracture origin. There is a possibility that the triaxiality was involved in the fracture strongly through the increase of maximum principal stress. Moreover, from the analyses accounting for several kinds of large earthquake waveforms, it was indicated that threre is possibility that the distribution of triaxiality around the fracture origin was not affected by significantly by each cycle and each waveform.
A New Electrophysiological Method for the Diagnosis of Extraforaminal Stenosis at L5–S1
Hiroshi Iwasaki,Munehito Yoshida,Hiroshi Yamada,Hiroshi Hashizume,Akihito Minamide,Yukihiro Nakagawa,Masaki Kawai,Shunji Tsutsui 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.2
Study Design: A retrospective study. Purpose: To examine the effectiveness of using an electrodiagnostic technique as a new approach in the clinical diagnosis of extraforaminal stenosis at L5–S1. Overview of Literature: We introduced a new effective approach to the diagnosis of extraforaminal stenosis at the lumbosacral junction using the existing electrophysiological evaluation technique. Methods: A consecutive series of 124 patients with fifth lumbar radiculopathy were enrolled, comprising a group of 74 patients with spinal canal stenosis and a second group of 50 patients with extraforaminal stenosis at L5–S1. The technique involved inserting a pair of needle electrodes into the foraminal exit zone of the fifth lumbar spinal nerves, which were used to provide electrical stimulation. The compound muscle action potentials from each of the tibialis anterior muscles were recorded. Results: The distal motor latency (DML) of the potentials ranged from 11.2 to 24.6 milliseconds in patients with extraforaminal stenosis. In contrast, the DML in patients with spinal canal stenosis ranged from 10.0 to 17.2 milliseconds. After comparing the DML of each of the 2 groups and at the same time comparing the differences in DML between the affected and unaffected side of each patient, we concluded there were statistically significant differences (p <0.01) between the 2 groups. Using receiver operating characteristic curve analysis, the cutoff values were calculated to be 15.2 milliseconds and 1.1 milliseconds, respectively. Conclusions: This approach using a means of DML measurement enables us to identify and localize lesions, which offers an advantage in diagnosing extraforaminal stenosis at L5–S1.
CO2 reforming of waste plastics
Hiroshi Yamada,Hiromasa Mori,Tomohiko Tagawa 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.1
Carbon dioxide reforming of polyethylene was carried out. Pyrolysis and catalytic carbon dioxide reforming were combined. Polyethylene was packed at the bottom of the reactor and the catalyst, Pd/Al2O3, was packed at the top of the reactor. The pyrolysis of the polyethylene occurred at the bottom of the reactor, and the pyrolysis products reacted with carbon dioxide on the catalyst bed. Carbon dioxide reforming occurred on the catalyst bed zone. Hydrogen, carbonmonoxide,methane, ethane, ethene were produced at 910 and 720 K which were the catalyst and polyethylene temperature, respectively. Polyethylene was completely reformed to carbon monoxide and hydrogen when catalyst temperature was increased or polyethylene temperature was decreased.
Hiroshi Yamada 아시아테플 2018 The Journal of Asia TEFL Vol.15 No.4
Vocabulary learning strategies (VLS) play a crucial role in L2 vocabulary education. Although it is assumed that metacognitive VLS are effective, few studies have empirically investigated this assumption. This paper, therefore, conducted a study in order to establish a comprehensive taxonomy of metacognitive VLS and explored the relationship between the use of metacognitive VLS and vocabulary knowledge. A vocabulary size test and a VLS questionnaire were administered to 132 Japanese junior high school students. The data were analyzed using exploratory factor analysis and multiple regression analysis. The results showed a total of 20 metacognitive VLS and categorized them into six. Among the six metacognitive VLS, input seeking was a positive predictor of test scores at any frequency level, while spaced learning, guessing with confidence, and note making varied in effectiveness depending on word frequency. These results suggest it is important to encourage students to learn vocabulary outside the classroom, teach basic affix knowledge, and facilitate students in making vocabulary notebooks.