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Arai Hikaru,Asami Koki,Ito Hajime,Katayama Noboru 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Catalyst layers of proton exchange membrane fuel cells (PEMFC) are formed by electrospray deposition (ESD) method. The cathode catalyst layers are formed and characterized by varying the settings of the system, such as flow rate, applied voltage and the distance between the capillary and the substrate. The dryness of the aggregates during deposition is evaluated using the Damkh¨oler number (Da), and the structure of the catalyst layer is observed using SEM, which shows that the catalyst layer is porous when dry and non-porous when insufficiently dry. In the case of insufficient drying, the structure changed significantly depending on the position. Single cell tests show that the maximum power density varies from 105 to 253 mWcm-2 depending on the settings, even with the same catalyst ink and the same amount of platinum. Electrochemical impedance spectroscopy shows that the charge transfer and mass transport resistances tend to decrease with increase in Da.
Chiba, Reiichi,Komatsu, Takeshi,Orui, Himeko,Taguchi, Hiroaki,Nazawa, Kazuhiko,Arai, Hajime The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12
We fabricated single cells with a cathode consisting of a $LaNi_{0.6}Fe_{0.4}O_3-Ce_{0.8}Sm_{0.2}O_{1.9}$ composite (LNF-S20DC composite) active layer and an LNF current collecting layer on a ${0.89ZrO_2}-{0.10Sc_2}{O_3}-0.01{Al_2}{O_3}$ electrolyte sheet. The cathode layers were prepared by the screen-printing method. The cathode properties of these cells were measured by the AC impedance method at $800^{\circ}C$. The cathodes with the ceria-LNF composite active layer exhibited high power performance prior to current loading. We investigated the influence of the mixture ratio of LNF and S20DC on the cathodes properties. The Sm in the ceria particles of the composite cathode was substituted with other rare-earth elements. Cathodes with Pr and Gd co-doped ceria in the active layer provided the better performance than those with Sm- or Gd-doped ceria.
An SOFC Cathode Composed of LaNi0.6Fe0.4O3 and Ce(Ln)O2 (Ln=Sm, Gd, Pr)
Reiichi Chiba,Takeshi Komatsu,Himeko Orui,Hiroaki Taguchi,Kazuhiko Nozawa,Hajime Arai 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12
We fabricated single cells with a cathode consisting of a LaNi0.6Fe0.4O3-Ce0.8Sm0.2O1.9 composite (LNF-S20DC composite) active layer and an LNF current collecting layer on a 0.89ZrO2-0.10Sc2O3 -0.01Al2O3 electrolyte sheet. The cathode layers were prepared by the screen-printing method. The cathode properties of these cells were measured by the AC impedance method at 800oC. The cathodes with the ceria-LNF composite active layer exhibited high power performance prior to current loading. We investigated the influence of the mixture ratio of LNF and S20DC on the cathodes properties. The Sm in the ceria particles of the composite cathode was substituted with other rare-earth elements. Cathodes with Pr and Gd co-doped ceria in the active layer provided the better performance than those with Sm- or Gd-doped ceria. We fabricated single cells with a cathode consisting of a LaNi0.6Fe0.4O3-Ce0.8Sm0.2O1.9 composite (LNF-S20DC composite) active layer and an LNF current collecting layer on a 0.89ZrO2-0.10Sc2O3 -0.01Al2O3 electrolyte sheet. The cathode layers were prepared by the screen-printing method. The cathode properties of these cells were measured by the AC impedance method at 800oC. The cathodes with the ceria-LNF composite active layer exhibited high power performance prior to current loading. We investigated the influence of the mixture ratio of LNF and S20DC on the cathodes properties. The Sm in the ceria particles of the composite cathode was substituted with other rare-earth elements. Cathodes with Pr and Gd co-doped ceria in the active layer provided the better performance than those with Sm- or Gd-doped ceria.
Effect of romosozumab in premenopausal women with severe osteoporosis and anorexia nervosa
Kazuki Fujimoto,Narumi Maki,Daisuke Hashiba,Toshifumi Maeyama,Ryosuke Nakagawa,Hajime Arai,Seiji Ohtori 대한골다공증학회 2023 Osteoporosis and Sarcopenia Vol.9 No.4
Objectives: This study aims to investigate the effects of romosozumab on bone mineral density (BMD) and bone metabolism. Methods: In this retrospective case series, romosozumab was administered to 5 premenopausal female patients with osteoporosis and anorexia nervosa with fragility fractures. BMD and bone turnover marker changes were investigated at 6 months and 1 year after administering romosozumab. Results: BMD increased and high-turnover bone metabolism decreased 6 months and 1 year after administering romosozumab. Conclusions: Romosozumab is useful for treating osteoporosis in patients with anorexia nervosa.
Seiji Ohtori,Masaomi Yamashita,Yasuaki Murata,Yawara Eguchi,Yasuchika Aoki,Hiromi Ataka,Jiro Hirayama,Tomoyuki Ozawa,Tatsuo Morinaga,Hajime Arai,Masaya Mimura,Hiroto Kamoda,Sumihisa Orita,Masayuki Miy 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.3
Purpose: To examine the effects of conservative and surgical treatments for nocturnalleg cramps in patients with lumbar spinal stenosis (LSS). Nocturnal leg cramps is frequently observed in patients with peripheral neuropathy. However, there have been few reports on the relationship between nocturnal leg cramps and LSS, and it remains unknown whether conservative or surgical intervention has an impact on leg cramps in patients with LSS. Materials and Methods: The subjects were 130 LSS patients with low back and leg pain. Conservative treatment such as exercise, medication, and epidural block was used in 66 patients and surgical treatmentsuch as decompression or decompression and fusion was performed in 64 patients. Pain scores and frequency of nocturnal leg cramps were evaluated based on self-reported questionnaires completed before and 3 months after treatment. Results: The severity of low back and leg pain was higher and the incidence of nocturnal leg cramps was significantly higher before treatment in the surgically treated group compared with the conservatively treated group. Pain scores improvedin both groups after the intervention. The incidence of nocturnal leg cramps was significantly improved by surgical treatment (p=0.027), but not by conservative treatment (p=0.122). Conclusion: The findings of this prospective study indicate that the prevalence of nocturnal leg cramps is associated with LSS and severity of symptoms. Pain symptoms were improved by conservative or surgicaltreatment, but only surgery improved nocturnal leg cramps in patients with LSS. Thus, these results indicate that the prevalence of nocturnal leg cramps is associatedwith spinal nerve compression by LSS.
Seiji Ohtori,Masaomi Yamashita,Yasuaki Murata,Yawara Eguchi,Yasuchika Aoki,Hiromi Ataka,Jiro Hirayama,Tomoyuki Ozawa,Tatsuo Morinaga,Hajime Arai,Masaya Mimura,Hiroto Kamoda,Sumihisa Orita,Masayuki Miy 연세대학교의과대학 2013 Yonsei medical journal Vol.54 No.4
Purpose: The pathological mechanism of lumbar spinal stenosis is reduced blood flow in nerve roots and degeneration of nerve roots. Exercise and prostaglandin E1 is used for patients with peripheral arterial disease to increase capillary flow around the main artery and improve symptoms; however, the ankle-brachial index (ABI), an estimation of blood flow in the main artery in the leg, does not change after treatment. Lumbar spinal nerve roots contain somatosensory, somatomotor, and unmyelinated autonomic nerves. Improved blood flow by medication with prostaglandin E1 and decompression surgery in these spinal nerve roots may improve the function of nerve fibers innervating muscle, capillary, and main vessels in the lower leg, resulting in an increased ABI. The purpose of the study was to examine whether these treatments can improve ABI. Materials and Methods: One hundred and seven patients who received conservative treatment such as exercise and medication (n=56) or surgical treatment (n=51) were included. Low back pain and leg pain scores, walking distance, and ABI were measured before treatment and after 3 months of conservative treatment alone or surgical treatment followed by conservative treatment. Results: Low back pain, leg pain, and walking distance significantly improved after both treatments (p<0.05). ABI significantly increased in each group (p<0.05). Conclusion: This is the first investigation of changes in ABI after treatment in patients with lumbar spinal stenosis. Improvement of the spinal nerve roots by medication and decompression surgery may improve the supply of blood flow to the lower leg in patients with lumbar spinal stenosis.