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Vortex Cavitation from Baffle Plate and Pump Vibration in a Double-Suction Volute Pump
Sato, Toshiyuki,Nagahara, Takahide,Tanaka, Kazuhiro,Fuchiwaki, Masaki,Shimizu, Fumio,Inoue, Akira Korean Society for Fluid machinery 2011 International journal of fluid machinery and syste Vol.4 No.1
This study highlights especially the mechanism of vortex cavitation occurrence from the end of the suction duct in a double-suction volute pump and pump oscillation which causes cavitation noise from the pump. In this study, full 3D numerical simulations have been performed using a commercial code inside the pump from the inlet of suction duct to the outlet of delivery duct. The numerical model is based on a combination of multiphase flow equations with the truncated version of the Rayleigh-Plesset model predicting the complicated growth and collapse process of cavity bubbles. The experimental investigations have also been performed on the cavitating flow with flow visualization to evaluate the numerical results.
Cacao bean husk: an applicable bedding material in dairy free-stall barns
Akira Yajima,Hisashi Owada,Suguru Kobayashi,Natsumi Komatsu,Kazuaki Takehara,Maria Ito,Kazuhide Matsuda,Kan Sato,Hisao Itabashi,Satoshi Sugimura,Shuhei Kanda 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.7
Objective: The objectives of the study were to assess the effect of cacao bean husk as bedding material in free-stall barn on the behavior, productivity, and udder health of dairy cattle, and on the ammonia concentrations in the barn. Methods: Four different stall surfaces (no bedding, cacao bean husk, sawdust, and chopped wheat straw) were each continuously tested for a period of 1 week to determine their effects on nine lactating Holstein cows housed in the free-stall barn with rubber matting. The lying time and the milk yield were measured between d 4 and d 7. Blood samples for plasma cortisol concentration and teat swabs for bacterial counts were obtained prior to morning milking on d 7. The time-averaged gas-phase ammonia concentrations in the barn were measured between d 2 and d 7. Results: The cows spent approximately 2 h more per day lying in the stalls when bedding was available than without bedding. The milk yield increased in the experimental periods when cows had access to bedding materials as compared to the period without bedding. The lying time was positively correlated with the milk yield. Bacterial counts on the teat ends recorded for cows housed on cacao bean husk were significantly lower than those recorded for cows housed without bedding. Ammonia concentration under cacao bean husk bedding decreased by 6%, 15%, and 21% as compared to no bedding, sawdust, and chopped wheat straw, respectively. The cortisol concentration was lowest in the period when cacao bean husk bedding was used. We observed a positive correlation between the ammonia concentrations in the barn and the plasma cortisol concentrations. Conclusion: Cacao bean husk is a potential alternative of conventional bedding material, such as sawdust or chopped wheat straw, with beneficial effects on udder health and ammonia concentrations in the barns.
Akira Tsunoda,Tomoko Takahashi,Kenji Sato,Hiroshi Kusanagi 대한대장항문학회 2021 Annals of Coloproctolgy Vol.37 No.4
Purpose: External rectal prolapse (ERP) is frequently associated with other pelvic disorders, such as enterocele, rectocele, and perineal descent. Evacuation proctography makes it possible to visualize the development of such anatomical abnormalities. The aim of this study was to identify the variables that would predict associated abnormalities in patients with ERP.Methods: Between February 2010 and August 2019, 124 female patients with ERP, who were evaluated using proctography were included in this study. Enterocele was diagnosed when the extension of the loop of the small bowel was located between the vagina and rectum. A significant rectocele was defined as >20 mm in diameter. Multivariate analysis was used to establish which morphological parameters best predicted the presence of enterocele or rectocele.Results: Sixty-five patients had ERP alone, while 59 patients (47.6%) had additional findings on proctography. The most frequently associated abnormality was enterocele with 48 of the patients (38.7%) having this condition. Rectocele was detected in 17 of the 124 patients (13.7%). The median length of the ERP was 30 mm (range, 7 to 147 mm). The results of the stepwise multiple regression analysis showed that a history of hysterectomy and the length of the ERP were significantly associated with the presence of enterocele. The analysis showed that the longer the prolapse, the higher the incidence of enterocele. A history of hysterectomy was also significantly associated with the presence of rectocele.Conclusion: Patients with ERP often have associated anatomical abnormalities and should be investigated thoroughly before planning surgical treatment.
Yamamoto, Akira,Shin, Ryong-Woon,Hasegawa, Kazuhiro,Naki, Hironobu,Sato, Hiroyuki,Yoshimasu, Fumio,Kitamoto, Tetsuyuki 한림대학교 환경·생명과학연구소 2002 [일송 국제심포지엄] 노화와 만성퇴행성 신경질환 Vol.- No.4
Iron as well as aluminum is reported to accumulate in neurons with neurofibrillary tangles (NFTs) of Alzheimer's disease(AD) brain. Previously we demonstrated that aluminum(Ⅲ) shows phosphate-dependent binding with hyperphosphorylated τ(PHFτ), the major constituent of NFTs, thereby inducing aggregation of PHFτ. Herein we report that iron(Ⅲ) can also induce aggregation of soluble PHFτ to occur, iron in the oxidized state (Ⅲ) is essential since iron in the reduced state (Ⅲ) lacks such ability. Furthermore, iron (Ⅲ)-induced aggregation is reversed by reducing iron (Ⅲ) to iron (Ⅱ). Thus the iron-participating aggregation is mediated not only by τ phosphorylation but also by the transition of iron between reduced (Ⅱ) and oxidized (Ⅲ) states. Further incubation of insoluble PHFτ aggregates isolated from AD brain with reducing agents produced liberation of solubilized PHFτ and iron (Ⅱ), indicating that PHFτ in association with iron (Ⅲ) constitutes the insoluble pool of PHFτ. These results indicate that iron might play a role in the aggregation of PHFτ leading to the formation of NFTs in AD brain.
Unilateral loss of thoracic motion after blunt trauma: a sign of acute Brown-Séquard syndrome
Mizuki Sato,Akira Kuriyama,Ryo Ohtomo 대한응급의학회 2019 Clinical and Experimental Emergency Medicine Vol.6 No.3
Late-onset Brown-Séquard syndrome (BSS) is a rare condition resulting from a spinal cord injury that develops weeks to years after a blunt trauma. Acute-onset BSS after a blunt injury has been rarely reported. Here, we report on a case of BSS, in a 58-year-old man, that developed immediately after a motor vehicle accident. Upon admission, loss of right thoracic motion, complete right paresis, and loss of pain and temperature sensations below the C3 level on the left side were observed. Magnetic resonance imaging showed hyperintensities within the cervical spinal cord at the C2–C3 level, confirming the diagnosis of BSS. Thoracic motion rapidly recovered, but other neurological sequelae persisted. BSS related to cervical cord injury should be suspected when patients develop hemiparesis and contralateral sensory loss immediately after a blunt trauma. Likewise, clinicians should be aware that unilateral loss of thoracic motion could be an important sign of BSS.