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Oxidation Behavior of WC-TiC-TaC Binderless Cemented Carbide under Low Partial Pressure of Oxygen
Uchiyama Yasuo,Ueno Shuji,Sano Hideaki,Tanaka Hiroki,Nakahara Kenji,Sakaguchi Shigeya,Nakano Osamu 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
WC-TiC-TaC binderless cemented carbide was oxidized under low partial pressure of oxygen (50ppm) at 873K for 1 to 20 h. Surface roughness was measured using atomic force microscope, and effect of TiC amount on oxidation behavior of the carbide was investigated. WC phase was oxidized more easily than WC-TiC-TaC solid solution phase. With an increase in TiC amount, WC-TiC-TaC phase increased and the oxidation resistance of the carbide increased.
Hiroki Umezawa,Yoji Kokura,Satoko Abe,Chieko Suzuki,Akiko Nishida,Yoshie Uchiyama,Keisuke Maeda,Hidetaka Wakabayashi,Ryo Momosaki 대한재활의학회 2019 Annals of Rehabilitation Medicine Vol.43 No.5
Objective To analyze whether sufficient energy intake (EI) improves performance of activities of daily living (ADL) in patients with hip fracture admitted to rehabilitation hospitals. The adequate amount of EI for improving performance of ADL in patients with hip fracture remains unknown. Methods This retrospective cohort study included all patients with hip fracture (n=234) admitted to rehabilitation hospitals in Japan. The inclusion criteria for this study were age >65 years and body mass index <30.0 kg/m2. Patients who were transferred to an acute hospital and those with missing case data were excluded. According to the amount of EI, the patients were classified into energy sufficiency and shortage groups (EI/total energy expenditure ≥1.0 and <1.0, respectively). The Functional Independence Measure (FIM) and FIM gain were used to evaluate the patient disability level and change in patient status in response to rehabilitation. Finally, FIM gain was calculated as the discharge FIM score minus the admission FIM score. Results The final analysis targeted 202 patients—53 (26.2%) were in the energy shortage group and 149 (73.8%) were in the energy sufficiency group. The energy sufficiency group had a greater FIM gain than the energy shortage group (mean, 25.1±14.2 vs. 19.7±16.4; p=0.024). Furthermore, sufficient EI in the first week since admission (β=0.165; 95% confidence interval, 0.392–5.230; p=0.023) was an independent factor of FIM gain. Conclusion Among elderly patients with hip fracture admitted to rehabilitation hospitals in Japan, the amount of EI during the first week after admission was an independent factor of FIM gain.
Effect of TiC Content on Oxidation Behavior of Sintered WC-TiC-TaC Alloys
Tanaka Hiroki,Mouri Shigeki,Nakahara Kenji,Sano Hideaki,Zheng Guo Bin,Uchiyama Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The effect of TiC content on oxidation behavior of the sintered WC-TiC-TaC alloys with 2 mass% TaC and different TiC amounts of 3-45 mass% was investigated through oxidation tests in air at 973K. As a result of the tests, it was revealed that with increasing TiC content in the alloys, mass changes caused by oxidation and thickness of the scale decreased. Thus, it is considered that the main component of the scales changed gradually from to with increasing TiC content in the alloys, and oxygen diffusion through the scale to the alloys was inhibited gradually.
(Mitsuharu Ide),(Hiroki Uchiyama),(Toshifumi Ishikura) 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.5
A gas-liquid two phase plunging jet is formed through a gas sucking type multi-jet ejector nozzle. In this study, the effects of various conditions in the multi-jet ejector nozzle, the column diameter, and the liquid jet length on penetration depth of air bubbles l_B and gas holdup h_G in a gas-liquid two phase plunging jet absorber were studied experimentally. Consequently, empirical equations concerning l_B and h_G were obtained, respectively. These equations agree with the experimental data with an accuracy of ±20% for l_B and ±25% for h_G.
Ishikura, Toshifumi,Ide, Mitsuharu,Uchiyama, Hiroki 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.5
A gas-liquid two phase plunging jet is formed through a gas sucking type multi-jet ejector nozzle. In this study, the effects of various conditions in the multi-jet ejector nozzle, the column diameter, and the liquid jet length on penetration depth of air bubbles l_B and gas holdup h_G in a gas-liquid two phase plunging jet absorber were studied experimentally. Consequently, empirical equations concerning l_B and h_G were obtained, respectively. These equations agree with the experimental data with an accuracy of ±20% for l_B and ±25% for h_G.
( Yasunari Sakamoto ),( Shingo Kato ),( Yusuke Sekino ),( Eiji Sakai ),( Takashi Uchiyama ),( Hiroshi Iida ),( Kunihiro Hosono ),( Hiroki Endo ),( Koji Fujita ),( Tomoko Koide ),( Hirokazu Takahashi ) 대한소화기기능성질환·운동학회 2011 Journal of Neurogastroenterology and Motility (JNM Vol.17 No.2
Background/Aims There are few reports on the correlation between chewing gum and the gastrointestinal functions. But previous report showed use of chewing gum to be an effective method for controlling gastrointestinal symptoms. The aim of this study was to determine the correlation between chewing gum and gastric emptying using the continuous real time 13C breath test (BreathID system). Methods Ten healthy male volunteers participated in this randomized, 2-way crossover study. The subjects fasted overnight and were randomly assigned to chewing gum (Xylish, 2-3/1 tablet) for an hour following intake of a test meal (200 kcal/200 mL) or intake of the test meal alone. Gastric emptying was monitored for 4 hours after administration of the test meal by the 13C-acetic acid breath test performed continually using the BreathID system. Results No significant differences in the calculated parameters, namely, T1/2 (median, 111.82 vs 109.26 minutes; P = 0.575), Tlag (median, 53.28 vs 56.53 minutes; P = 0.333), gastric emptying coefficient (median, 3.58 vs 3.65; P = 0.285), regression-estimated constant β (median, 1.85 vs 1.80; P = 0.575) and regression-estimated constant κ (median, 0.61 vs 0.62; P = 0.959) were observed between the test meal alone group and the test meal and chewing gum group. Conclusions This study showed that chewing gum had no effect on the rate of gastric emptying. Therefore, since chewing gum did not enhance the speed of gastric emptying, it may ameliorate gastrointestinal symptoms through other mechanisms, such as saliva and autonomic nervous system. (J Neurogastroenterol Motil 2011;17:174-179)